commit 2400bbe0d831648ef3d97a9784731296d86b893e · bretton.dev/coves-mobile

-296

lib/services/oauth_service.dart

···

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       import 'dart:async';

     

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       import 'package:atproto_oauth_flutter/atproto_oauth_flutter.dart';

     

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       import 'package:flutter/foundation.dart';

     

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       import '../config/environment_config.dart';

     

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       import '../config/oauth_config.dart';

     

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       /// OAuth Service for atProto authentication using the new

     

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       /// atproto_oauth_flutter package

     

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       ///

     

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       /// Key improvements over the old implementation:

     

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       /// ✅ Proper decentralized OAuth discovery - works with ANY PDS

     

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       ///    (not just bsky.social)

     

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       /// ✅ Built-in session management - no manual token storage

     

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       /// ✅ Automatic token refresh with concurrency control

     

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       /// ✅ Session event streams for updates and deletions

     

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       /// ✅ Secure storage handled internally

     

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       ///    (iOS Keychain, Android EncryptedSharedPreferences)

     

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       ///

     

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       /// The new package handles the complete OAuth flow:

     

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       /// 1. Handle/DID resolution

     

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       /// 2. PDS discovery from DID document

     

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       /// 3. Authorization server discovery

     

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       /// 4. PKCE + DPoP generation

     

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       /// 5. Browser-based authorization

     

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       /// 6. Token exchange and storage

     

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       /// 7. Automatic refresh and revocation

     

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       class OAuthService {

     

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         factory OAuthService() => _instance;

     

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         OAuthService._internal();

     

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         static final OAuthService _instance = OAuthService._internal();

     

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         FlutterOAuthClient? _client;

     

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         // Session event stream subscriptions

     

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         StreamSubscription<SessionUpdatedEvent>? _onUpdatedSubscription;

     

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         StreamSubscription<SessionDeletedEvent>? _onDeletedSubscription;

     

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         /// Initialize the OAuth client

     

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         ///

     

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         /// This creates a FlutterOAuthClient with:

     

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         /// - Discoverable client metadata (HTTPS URL)

     

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         /// - Custom URL scheme for deep linking

     

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         /// - DPoP enabled for token security

     

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         /// - Automatic session management

     

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         Future<void> initialize() async {

     

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           try {

     

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             // Get environment configuration

     

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             final config = EnvironmentConfig.current;

     

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             // Create client with metadata from config

     

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             // For local development, use custom resolvers

     

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             _client = FlutterOAuthClient(

     

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               clientMetadata: OAuthConfig.createClientMetadata(),

     

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               plcDirectoryUrl: config.plcDirectoryUrl,

     

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               handleResolverUrl: config.handleResolverUrl,

     

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               allowHttp: config.isLocal, // Allow HTTP for local development

     

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             );

     

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             // Set up session event listeners

     

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             _setupEventListeners();

     

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             if (kDebugMode) {

     

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               print('✅ FlutterOAuthClient initialized');

     

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               print('   Environment: ${config.environment}');

     

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               print('   Client ID: ${OAuthConfig.clientId}');

     

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               print('   Redirect URI: ${OAuthConfig.customSchemeCallback}');

     

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               print('   Scope: ${OAuthConfig.scope}');

     

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               print('   Handle Resolver: ${config.handleResolverUrl}');

     

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               print('   PLC Directory: ${config.plcDirectoryUrl}');

     

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               print('   Allow HTTP: ${config.isLocal}');

     

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             }

     

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           } catch (e) {

     

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             if (kDebugMode) {

     

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               print('❌ Failed to initialize OAuth client: $e');

     

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             }

     

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             rethrow;

     

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           }

     

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         }

     

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         /// Set up listeners for session events

     

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         void _setupEventListeners() {

     

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           if (_client == null) {

     

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             return;

     

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           }

     

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           // Listen for session updates (token refresh, etc.)

     

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           _onUpdatedSubscription = _client!.onUpdated.listen((event) {

     

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             if (kDebugMode) {

     

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               print('📝 Session updated for: ${event.sub}');

     

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             }

     

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           });

     

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           // Listen for session deletions (revoke, expiry, errors)

     

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           _onDeletedSubscription = _client!.onDeleted.listen((event) {

     

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             if (kDebugMode) {

     

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               print('🗑️ Session deleted for: ${event.sub}');

     

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               print('   Cause: ${event.cause}');

     

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             }

     

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           });

     

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         }

     

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         /// Sign in with an atProto handle

     

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         ///

     

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         /// The new package handles the complete OAuth flow:

     

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         /// 1. Resolves handle → DID (using any handle resolver)

     

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         /// 2. Fetches DID document to find the user's PDS

     

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         /// 3. Discovers authorization server from PDS metadata

     

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         /// 4. Generates PKCE challenge and DPoP keys

     

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         /// 5. Opens browser for user authorization

     

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         /// 6. Handles callback and exchanges code for tokens

     

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         /// 7. Stores session securely (iOS Keychain / Android EncryptedSharedPreferences)

     

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         ///

     

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         /// This works with ANY PDS - not just bsky.social! 🎉

     

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         ///

     

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         /// Examples:

     

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         /// - `signIn('alice.bsky.social')` → Bluesky PDS

     

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         /// - `signIn('bob.custom-pds.com')` → Custom PDS ✅

     

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         /// - `signIn('did:plc:abc123')` → Direct DID (skips handle resolution)

     

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         ///

     

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         /// Returns the authenticated OAuthSession.

     

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         Future<OAuthSession> signIn(String input) async {

     

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           try {

     

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             if (_client == null) {

     

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               throw Exception(

     

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                 'OAuth client not initialized. Call initialize() first.',

     

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               );

     

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             }

     

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             // Validate input

     

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             final trimmedInput = input.trim();

     

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             if (trimmedInput.isEmpty) {

     

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               throw Exception('Please enter a valid handle or DID');

     

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             }

     

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             if (kDebugMode) {

     

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               print('🔐 Starting sign-in for: $trimmedInput');

     

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               print('━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━');

     

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             }

     

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             // Call the new package's signIn method

     

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             // This does EVERYTHING: handle resolution, PDS discovery, OAuth flow,

     

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             // token storage

     

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             if (kDebugMode) {

     

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               print('📞 Calling FlutterOAuthClient.signIn()...');

     

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             }

     

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             final session = await _client!.signIn(trimmedInput);

     

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             if (kDebugMode) {

     

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               print('✅ Sign-in successful!');

     

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               print('   DID: ${session.sub}');

     

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               print('   PDS: ${session.serverMetadata['issuer'] ?? 'unknown'}');

     

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               print('━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━');

     

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             }

     

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             return session;

     

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           } on OAuthCallbackError catch (e, stackTrace) {

     

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             // OAuth-specific errors (access denied, invalid request, etc.)

     

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             final errorCode = e.params['error'];

     

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             final errorDescription = e.params['error_description'] ?? e.message;

     

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             if (kDebugMode) {

     

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               print('❌ OAuth callback error details:');

     

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               print('   Error code: $errorCode');

     

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               print('   Description: $errorDescription');

     

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               print('   Message: ${e.message}');

     

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               print('   All params: ${e.params}');

     

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               print('   Exception type: ${e.runtimeType}');

     

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               print('   Exception: $e');

     

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               print('   Stack trace:');

     

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               print('$stackTrace');

     

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             }

     

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             if (errorCode == 'access_denied') {

     

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               throw Exception('Sign in cancelled by user');

     

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             }

     

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             throw Exception('OAuth error: $errorDescription');

     

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           } catch (e, stackTrace) {

     

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             // Catch all other errors including user cancellation

     

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             if (kDebugMode) {

     

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               print('❌ Sign in failed - detailed error:');

     

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               print('   Error type: ${e.runtimeType}');

     

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               print('   Error: $e');

     

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               print('   Stack trace:');

     

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               print('$stackTrace');

     

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             }

     

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             // Check if user cancelled (flutter_web_auth_2 throws

     

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             // PlatformException with "CANCELED" code)

     

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             if (e.toString().contains('CANCELED') ||

     

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                 e.toString().contains('User cancelled')) {

     

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               throw Exception('Sign in cancelled by user');

     

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             }

     

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             throw Exception('Sign in failed: $e');

     

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           }

     

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         }

     

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         /// Restore a previous session if available

     

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         ///

     

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         /// The new package handles session restoration automatically:

     

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         /// - Loads session from secure storage

     

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         /// - Checks token expiration

     

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         /// - Automatically refreshes if needed

     

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         /// - Returns null if no valid session exists

     

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         ///

     

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         /// Parameters:

     

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         /// - `did`: User's DID (e.g., "did:plc:abc123")

     

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         /// - `refresh`: Token refresh strategy:

     

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         ///   - 'auto' (default): Refresh only if expired

     

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         ///   - true: Force refresh even if not expired

     

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         ///   - false: Use cached tokens even if expired

     

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         ///

     

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         /// Returns the restored session or null if no session found.

     

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         Future<OAuthSession?> restoreSession(

     

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           String did, {

     

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           String refresh = 'auto',

     

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         }) async {

     

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           try {

     

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             if (_client == null) {

     

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               throw Exception(

     

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                 'OAuth client not initialized. Call initialize() first.',

     

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               );

     

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             }

     

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             if (kDebugMode) {

     

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               print('🔄 Attempting to restore session for: $did');

     

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             }

     

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             // Call the new package's restore method

     

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             final session = await _client!.restore(did, refresh: refresh);

     

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             if (kDebugMode) {

     

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               print('✅ Session restored successfully');

     

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               final info = await session.getTokenInfo();

     

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               print('   Token expires: ${info.expiresAt}');

     

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             }

     

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             return session;

     

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           } on Exception catch (e) {

     

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             if (kDebugMode) {

     

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               print('⚠️ Failed to restore session: $e');

     

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             }

     

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             return null;

     

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           }

     

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         }

     

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         /// Sign out and revoke session

     

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         ///

     

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         /// The new package handles revocation properly:

     

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         /// - Calls server's token revocation endpoint (best-effort)

     

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         /// - Deletes session from secure storage (always)

     

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         /// - Emits 'deleted' event

     

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         ///

     

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         /// This is a complete sign-out with server-side revocation! 🎉

     

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         Future<void> signOut(String did) async {

     

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           try {

     

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             if (_client == null) {

     

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               throw Exception(

     

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                 'OAuth client not initialized. Call initialize() first.',

     

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               );

     

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             }

     

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             if (kDebugMode) {

     

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               print('👋 Signing out: $did');

     

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             }

     

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             // Call the new package's revoke method

     

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             await _client!.revoke(did);

     

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             if (kDebugMode) {

     

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               print('✅ Sign out successful');

     

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             }

     

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           } catch (e) {

     

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             if (kDebugMode) {

     

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               print('⚠️ Sign out failed: $e');

     

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             }

     

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             // Re-throw to let caller handle

     

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             rethrow;

     

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           }

     

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         }

     

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         /// Get the current OAuth client instance

     

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         ///

     

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         /// Useful for advanced use cases like:

     

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         /// - Listening to session events directly

     

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         /// - Using lower-level OAuth methods

     

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         FlutterOAuthClient? get client => _client;

     

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         /// Clean up resources

     

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         void dispose() {

     

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           _onUpdatedSubscription?.cancel();

     

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           _onDeletedSubscription?.cancel();

     

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         }

     

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       }

-337

packages/atproto_oauth_flutter/CHUNK3_IMPLEMENTATION_REPORT.md

···

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       # Chunk 3 Implementation Report: Identity Resolution Layer

     

       2
       -
       

     

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       ## Status: ✅ COMPLETE

     

       4
       -
       

     

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       Implementation Date: 2025-10-27

     

       6
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       Implementation Time: ~2 hours

     

       7
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       Lines of Code: ~1,431 lines across 9 Dart files

     

       8
       -
       

     

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       ## Overview

     

       10
       -
       

     

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       Successfully ported the **atProto Identity Resolution Layer** from TypeScript to Dart with full 1:1 API compatibility. This is the **most critical component for atProto decentralization**, enabling users to host their data on any Personal Data Server (PDS) instead of being locked to bsky.social.

     

       12
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       ## What Was Implemented

     

       14
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       ### Core Files Created

     

       16
       -
       

     

       17
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       ```

     

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       lib/src/identity/

     

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       ├── constants.dart                    (30 lines)   - atProto constants

     

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       ├── did_document.dart                 (124 lines)  - DID document parsing

     

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       ├── did_helpers.dart                  (227 lines)  - DID validation utilities

     

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       ├── did_resolver.dart                 (269 lines)  - DID → Document resolution

     

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       ├── handle_helpers.dart               (31 lines)   - Handle validation

     

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       ├── handle_resolver.dart              (209 lines)  - Handle → DID resolution

     

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       ├── identity_resolver.dart            (378 lines)  - Main resolver (orchestrates everything)

     

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       ├── identity_resolver_error.dart      (53 lines)   - Error types

     

       27
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       ├── identity.dart                     (43 lines)   - Public API exports

     

       28
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       └── README.md                         (267 lines)  - Comprehensive documentation

     

       29
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       ```

     

       30
       -
       

     

       31
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       ### Additional Files

     

       32
       -
       

     

       33
       -
       ```

     

       34
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       test/identity_resolver_test.dart      (231 lines)  - 21 passing unit tests

     

       35
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       example/identity_resolver_example.dart (95 lines)  - Usage examples

     

       36
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       ```

     

       37
       -
       

     

       38
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       ## Critical Functionality Implemented

     

       39
       -
       

     

       40
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       ### 1. Handle Resolution (Handle → DID)

     

       41
       -
       

     

       42
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       Resolves atProto handles like `alice.bsky.social` to DIDs using XRPC:

     

       43
       -
       

     

       44
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       ```dart

     

       45
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       final resolver = XrpcHandleResolver('https://bsky.social');

     

       46
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       final did = await resolver.resolve('alice.bsky.social');

     

       47
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       // Returns: did:plc:...

     

       48
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       ```

     

       49
       -
       

     

       50
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       **Features:**

     

       51
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       - XRPC-based resolution via `com.atproto.identity.resolveHandle`

     

       52
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       - Proper error handling for invalid/non-existent handles

     

       53
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       - Built-in caching with configurable TTL (1 hour default)

     

       54
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       - Validates DIDs are proper atProto DIDs (plc or web)

     

       55
       -
       

     

       56
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       ### 2. DID Resolution (DID → DID Document)

     

       57
       -
       

     

       58
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       Fetches DID documents from PLC directory or HTTPS:

     

       59
       -
       

     

       60
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       ```dart

     

       61
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       final resolver = AtprotoDidResolver();

     

       62
       -
       

     

       63
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       // Resolve did:plc from PLC directory

     

       64
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       final doc = await resolver.resolve('did:plc:z72i7hdynmk6r22z27h6abc2');

     

       65
       -
       

     

       66
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       // Resolve did:web via HTTPS

     

       67
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       final doc2 = await resolver.resolve('did:web:example.com');

     

       68
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       ```

     

       69
       -
       

     

       70
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       **Features:**

     

       71
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       - `did:plc` method: Queries https://plc.directory/

     

       72
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       - `did:web` method: Fetches from HTTPS URLs (/.well-known/did.json or /did.json)

     

       73
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       - Validates DID document structure

     

       74
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       - Caching with 24-hour default TTL

     

       75
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       - No HTTP redirects (security)

     

       76
       -
       

     

       77
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       ### 3. Identity Resolution (Handle/DID → Complete Info)

     

       78
       -
       

     

       79
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       Main resolver that orchestrates everything:

     

       80
       -
       

     

       81
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       ```dart

     

       82
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       final resolver = AtprotoIdentityResolver.withDefaults(

     

       83
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         handleResolverUrl: 'https://bsky.social',

     

       84
       -
       );

     

       85
       -
       

     

       86
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       // Resolve handle to full identity info

     

       87
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       final info = await resolver.resolve('alice.bsky.social');

     

       88
       -
       print('DID: ${info.did}');

     

       89
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       print('Handle: ${info.handle}');

     

       90
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       print('PDS: ${info.pdsUrl}');

     

       91
       -
       

     

       92
       -
       // Or resolve directly to PDS URL (most common use case)

     

       93
       -
       final pdsUrl = await resolver.resolveToPds('alice.bsky.social');

     

       94
       -
       ```

     

       95
       -
       

     

       96
       -
       **Features:**

     

       97
       -
       - Accepts both handles and DIDs as input

     

       98
       -
       - Enforces bi-directional validation (security)

     

       99
       -
       - Extracts PDS URL from DID document

     

       100
       -
       - Validates handle in DID document matches original

     

       101
       -
       - Complete error handling with specific error types

     

       102
       -
       - Configurable caching at all layers

     

       103
       -
       

     

       104
       -
       ### 4. Bi-directional Validation (CRITICAL for Security)

     

       105
       -
       

     

       106
       -
       For every resolution, we validate both directions:

     

       107
       -
       

     

       108
       -
       1. **Handle → DID** resolution succeeds

     

       109
       -
       2. **DID Document** contains the original handle

     

       110
       -
       3. **Both directions** agree

     

       111
       -
       

     

       112
       -
       This prevents:

     

       113
       -
       - Handle hijacking

     

       114
       -
       - DID spoofing

     

       115
       -
       - MITM attacks

     

       116
       -
       

     

       117
       -
       ### 5. DID Document Parsing

     

       118
       -
       

     

       119
       -
       Full W3C DID Document support:

     

       120
       -
       

     

       121
       -
       ```dart

     

       122
       -
       final doc = DidDocument.fromJson(json);

     

       123
       -
       

     

       124
       -
       // Extract atProto-specific info

     

       125
       -
       final pdsUrl = doc.extractPdsUrl();

     

       126
       -
       final handle = doc.extractNormalizedHandle();

     

       127
       -
       

     

       128
       -
       // Access standard DID doc fields

     

       129
       -
       print(doc.id);           // DID

     

       130
       -
       print(doc.alsoKnownAs);  // Alternative identifiers

     

       131
       -
       print(doc.service);      // Service endpoints

     

       132
       -
       ```

     

       133
       -
       

     

       134
       -
       ### 6. Validation Utilities

     

       135
       -
       

     

       136
       -
       **DID Validation:**

     

       137
       -
       - `isDid()` - Checks if string is valid DID

     

       138
       -
       - `isDidPlc()` - Validates did:plc format (exactly 32 chars, base32)

     

       139
       -
       - `isDidWeb()` - Validates did:web format

     

       140
       -
       - `isAtprotoDid()` - Checks if DID uses blessed methods

     

       141
       -
       - `assertDid()` - Throws detailed errors for invalid DIDs

     

       142
       -
       

     

       143
       -
       **Handle Validation:**

     

       144
       -
       - `isValidHandle()` - Validates handle format per spec

     

       145
       -
       - `normalizeHandle()` - Converts to lowercase

     

       146
       -
       - `asNormalizedHandle()` - Validates and normalizes

     

       147
       -
       

     

       148
       -
       ### 7. Caching Layer

     

       149
       -
       

     

       150
       -
       Two-tier caching system:

     

       151
       -
       

     

       152
       -
       **Handle Cache:**

     

       153
       -
       - TTL: 1 hour default (handles can change)

     

       154
       -
       - In-memory implementation

     

       155
       -
       - Optional `noCache` bypass

     

       156
       -
       

     

       157
       -
       **DID Document Cache:**

     

       158
       -
       - TTL: 24 hours default (more stable)

     

       159
       -
       - In-memory implementation

     

       160
       -
       - Optional `noCache` bypass

     

       161
       -
       

     

       162
       -
       ### 8. Error Handling

     

       163
       -
       

     

       164
       -
       Comprehensive error hierarchy:

     

       165
       -
       

     

       166
       -
       ```dart

     

       167
       -
       IdentityResolverError           - Base error

     

       168
       -
       ├── InvalidDidError             - Malformed DID

     

       169
       -
       ├── InvalidHandleError          - Malformed handle

     

       170
       -
       ├── HandleResolverError         - Handle resolution failed

     

       171
       -
       └── DidResolverError           - DID resolution failed

     

       172
       -
       ```

     

       173
       -
       

     

       174
       -
       All errors include:

     

       175
       -
       - Detailed error messages

     

       176
       -
       - Original cause (if any)

     

       177
       -
       - Context about what failed

     

       178
       -
       

     

       179
       -
       ## Testing

     

       180
       -
       

     

       181
       -
       ### Unit Tests: ✅ 21 tests, all passing

     

       182
       -
       

     

       183
       -
       ```bash

     

       184
       -
       $ flutter test test/identity_resolver_test.dart

     

       185
       -
       All tests passed!

     

       186
       -
       ```

     

       187
       -
       

     

       188
       -
       **Test Coverage:**

     

       189
       -
       - DID validation (did:plc, did:web, general DIDs)

     

       190
       -
       - DID method extraction

     

       191
       -
       - URL ↔ did:web conversion

     

       192
       -
       - Handle validation and normalization

     

       193
       -
       - DID document parsing

     

       194
       -
       - PDS URL extraction

     

       195
       -
       - Handle extraction from DID docs

     

       196
       -
       - Cache functionality (store, retrieve, expire)

     

       197
       -
       - Error types and messages

     

       198
       -
       

     

       199
       -
       ### Static Analysis: ✅ No issues

     

       200
       -
       

     

       201
       -
       ```bash

     

       202
       -
       $ flutter analyze lib/src/identity/

     

       203
       -
       No issues found!

     

       204
       -
       ```

     

       205
       -
       

     

       206
       -
       ## Source Traceability

     

       207
       -
       

     

       208
       -
       This implementation is a 1:1 port from official atProto TypeScript packages:

     

       209
       -
       

     

       210
       -
       **Source Files:**

     

       211
       -
       - `/home/bretton/Code/atproto/packages/oauth/oauth-client/src/identity-resolver.ts`

     

       212
       -
       - `/home/bretton/Code/atproto/packages/internal/identity-resolver/src/`

     

       213
       -
       - `/home/bretton/Code/atproto/packages/internal/did-resolver/src/`

     

       214
       -
       - `/home/bretton/Code/atproto/packages/internal/handle-resolver/src/`

     

       215
       -
       

     

       216
       -
       **Key Differences from TypeScript:**

     

       217
       -
       1. **No DNS Resolution**: Dart doesn't have built-in DNS TXT lookups, use XRPC only

     

       218
       -
       2. **Dio instead of Fetch**: Using Dio HTTP client

     

       219
       -
       3. **Explicit Types**: Dart's stricter type system

     

       220
       -
       4. **Simplified Caching**: In-memory only (TypeScript has more backends)

     

       221
       -
       

     

       222
       -
       ## Why This Is Critical for Decentralization

     

       223
       -
       

     

       224
       -
       ### Problem Without This Layer

     

       225
       -
       

     

       226
       -
       Without proper identity resolution:

     

       227
       -
       - Apps hardcode `bsky.social` as the only server

     

       228
       -
       - Users can't use custom domains

     

       229
       -
       - Self-hosting is impossible

     

       230
       -
       - atProto becomes centralized like Twitter/X

     

       231
       -
       

     

       232
       -
       ### Solution With This Layer

     

       233
       -
       

     

       234
       -
       ✅ **Users host data on any PDS** they choose

     

       235
       -
       ✅ **Custom domain handles** work (e.g., `alice.example.com`)

     

       236
       -
       ✅ **Identity is portable** (change PDS without losing DID)

     

       237
       -
       ✅ **True decentralization** is achieved

     

       238
       -
       

     

       239
       -
       ## Real-World Usage Example

     

       240
       -
       

     

       241
       -
       ```dart

     

       242
       -
       // Create resolver

     

       243
       -
       final resolver = AtprotoIdentityResolver.withDefaults(

     

       244
       -
         handleResolverUrl: 'https://bsky.social',

     

       245
       -
       );

     

       246
       -
       

     

       247
       -
       // Resolve custom domain handle (NOT bsky.social!)

     

       248
       -
       final info = await resolver.resolve('jay.bsky.team');

     

       249
       -
       

     

       250
       -
       // Result:

     

       251
       -
       // - DID: did:plc:...

     

       252
       -
       // - Handle: jay.bsky.team (validated)

     

       253
       -
       // - PDS: https://bsky.team (NOT hardcoded!)

     

       254
       -
       

     

       255
       -
       // This user hosts their data on their own PDS!

     

       256
       -
       ```

     

       257
       -
       

     

       258
       -
       ## Performance Characteristics

     

       259
       -
       

     

       260
       -
       **With Cold Cache:**

     

       261
       -
       - Handle → PDS: ~200-500ms (1 handle lookup + 1 DID fetch)

     

       262
       -
       - DID → PDS: ~100-200ms (1 DID fetch only)

     

       263
       -
       

     

       264
       -
       **With Warm Cache:**

     

       265
       -
       - Any resolution: <1ms (in-memory lookup)

     

       266
       -
       

     

       267
       -
       **Recommendations:**

     

       268
       -
       - Enable caching (default)

     

       269
       -
       - Use connection pooling (Dio does this automatically)

     

       270
       -
       - Consider warming cache for known users

     

       271
       -
       - Monitor resolver errors and timeouts

     

       272
       -
       

     

       273
       -
       ## Security Considerations

     

       274
       -
       

     

       275
       -
       1. ✅ **Bi-directional Validation**: Always enforced

     

       276
       -
       2. ✅ **HTTPS Only**: All requests use HTTPS (except localhost)

     

       277
       -
       3. ✅ **No Redirects**: HTTP redirects rejected

     

       278
       -
       4. ✅ **Input Validation**: All handles/DIDs validated before use

     

       279
       -
       5. ✅ **Cache Poisoning Protection**: TTLs prevent stale data

     

       280
       -
       

     

       281
       -
       ## Dependencies

     

       282
       -
       

     

       283
       -
       **Required:**

     

       284
       -
       - `dio: ^5.9.0` - HTTP client (already in pubspec.yaml)

     

       285
       -
       

     

       286
       -
       **No additional dependencies needed!**

     

       287
       -
       

     

       288
       -
       ## Future Improvements

     

       289
       -
       

     

       290
       -
       Potential enhancements (not required for MVP):

     

       291
       -
       - [ ] Add DNS-over-HTTPS for handle resolution

     

       292
       -
       - [ ] Implement .well-known handle resolution

     

       293
       -
       - [ ] Add persistent cache backends (SQLite, Hive)

     

       294
       -
       - [ ] Support custom DID methods beyond plc/web

     

       295
       -
       - [ ] Add metrics and observability

     

       296
       -
       - [ ] Implement resolver timeouts and retries

     

       297
       -
       

     

       298
       -
       ## Integration Checklist

     

       299
       -
       

     

       300
       -
       To integrate this into OAuth flow:

     

       301
       -
       

     

       302
       -
       - [x] Identity resolver implemented

     

       303
       -
       - [x] Unit tests passing

     

       304
       -
       - [x] Static analysis clean

     

       305
       -
       - [x] Documentation complete

     

       306
       -
       - [ ] Export from main package (add to lib/atproto_oauth_flutter.dart)

     

       307
       -
       - [ ] Use in OAuth client for PDS discovery

     

       308
       -
       - [ ] Test with real handles (bretton.dev, etc.)

     

       309
       -
       

     

       310
       -
       ## Files to Review

     

       311
       -
       

     

       312
       -
       **Implementation:**

     

       313
       -
       - `/home/bretton/Code/coves_flutter/packages/atproto_oauth_flutter/lib/src/identity/`

     

       314
       -
       

     

       315
       -
       **Tests:**

     

       316
       -
       - `/home/bretton/Code/coves_flutter/packages/atproto_oauth_flutter/test/identity_resolver_test.dart`

     

       317
       -
       

     

       318
       -
       **Examples:**

     

       319
       -
       - `/home/bretton/Code/coves_flutter/packages/atproto_oauth_flutter/example/identity_resolver_example.dart`

     

       320
       -
       

     

       321
       -
       **Documentation:**

     

       322
       -
       - `/home/bretton/Code/coves_flutter/packages/atproto_oauth_flutter/lib/src/identity/README.md`

     

       323
       -
       

     

       324
       -
       ## Conclusion

     

       325
       -
       

     

       326
       -
       ✅ **Chunk 3 is COMPLETE and production-ready.**

     

       327
       -
       

     

       328
       -
       The identity resolution layer has been successfully ported from TypeScript with:

     

       329
       -
       - Full API compatibility

     

       330
       -
       - Comprehensive testing

     

       331
       -
       - Detailed documentation

     

       332
       -
       - Clean static analysis

     

       333
       -
       - Real-world usage examples

     

       334
       -
       

     

       335
       -
       This implementation enables true atProto decentralization by ensuring apps discover where each user's data lives, rather than hardcoding centralized servers.

     

       336
       -
       

     

       337
       -
       **Next Steps:** Integrate this into the OAuth client (Chunk 4+) to complete the full OAuth flow with proper PDS discovery.

-373

packages/atproto_oauth_flutter/CHUNK_5_IMPLEMENTATION.md

···

       1
       -
       # Chunk 5 Implementation: Session Management Layer

     

       2
       -
       

     

       3
       -
       ## Overview

     

       4
       -
       

     

       5
       -
       This chunk implements the session management layer for atproto OAuth in Dart, providing a complete 1:1 port of the TypeScript implementation from `@atproto/oauth-client`.

     

       6
       -
       

     

       7
       -
       ## Files Created

     

       8
       -
       

     

       9
       -
       ### Core Session Files

     

       10
       -
       

     

       11
       -
       1. **`lib/src/session/state_store.dart`**

     

       12
       -
          - `InternalStateData` - Ephemeral OAuth state during authorization flow

     

       13
       -
          - `StateStore` - Abstract interface for state storage

     

       14
       -
          - Stores PKCE verifiers, state parameters, nonces, and other temporary OAuth data

     

       15
       -
       

     

       16
       -
       2. **`lib/src/session/oauth_session.dart`**

     

       17
       -
          - `TokenSet` - OAuth token container (access, refresh, metadata)

     

       18
       -
          - `TokenInfo` - Token information for client use

     

       19
       -
          - `Session` - Session with DPoP key and tokens

     

       20
       -
          - `OAuthSession` - High-level API for authenticated requests

     

       21
       -
          - `SessionGetterInterface` - Abstract interface to avoid circular dependencies

     

       22
       -
       

     

       23
       -
       3. **`lib/src/session/session_getter.dart`**

     

       24
       -
          - `SessionGetter` - Main session management class

     

       25
       -
          - `CachedGetter` - Generic caching/refresh utility (base class)

     

       26
       -
          - `SimpleStore` - Abstract key-value store interface

     

       27
       -
          - `GetCachedOptions` - Options for cache retrieval

     

       28
       -
          - Event types: `SessionUpdatedEvent`, `SessionDeletedEvent`

     

       29
       -
          - Placeholder types: `OAuthServerFactory`, `Runtime`, `OAuthResponseError`

     

       30
       -
       

     

       31
       -
       4. **`lib/src/session/session.dart`**

     

       32
       -
          - Barrel file exporting all session-related classes

     

       33
       -
       

     

       34
       -
       ## Key Design Decisions

     

       35
       -
       

     

       36
       -
       ### 1. Avoiding Circular Dependencies

     

       37
       -
       

     

       38
       -
       **Problem**: `OAuthSession` needs `SessionGetter`, but `SessionGetter` returns `Session` objects that are used by `OAuthSession`.

     

       39
       -
       

     

       40
       -
       **Solution**: Created `SessionGetterInterface` in `oauth_session.dart` as an abstract interface. `SessionGetter` in `session_getter.dart` will implement this interface in later chunks when all dependencies are available.

     

       41
       -
       

     

       42
       -
       ```dart

     

       43
       -
       // oauth_session.dart

     

       44
       -
       abstract class SessionGetterInterface {

     

       45
       -
         Future<Session> get(AtprotoDid sub, {bool? noCache, bool? allowStale});

     

       46
       -
         Future<void> delStored(AtprotoDid sub, [Object? cause]);

     

       47
       -
       }

     

       48
       -
       

     

       49
       -
       // OAuthSession uses this interface

     

       50
       -
       class OAuthSession {

     

       51
       -
         final SessionGetterInterface sessionGetter;

     

       52
       -
         // ...

     

       53
       -
       }

     

       54
       -
       ```

     

       55
       -
       

     

       56
       -
       ### 2. TypeScript EventEmitter → Dart Streams

     

       57
       -
       

     

       58
       -
       **TypeScript Pattern**:

     

       59
       -
       ```typescript

     

       60
       -
       class SessionGetter extends EventEmitter {

     

       61
       -
         emit('updated', session)

     

       62
       -
         emit('deleted', sub)

     

       63
       -
       }

     

       64
       -
       ```

     

       65
       -
       

     

       66
       -
       **Dart Pattern**:

     

       67
       -
       ```dart

     

       68
       -
       class SessionGetter {

     

       69
       -
         final _updatedController = StreamController<SessionUpdatedEvent>.broadcast();

     

       70
       -
         Stream<SessionUpdatedEvent> get onUpdated => _updatedController.stream;

     

       71
       -
       

     

       72
       -
         final _deletedController = StreamController<SessionDeletedEvent>.broadcast();

     

       73
       -
         Stream<SessionDeletedEvent> get onDeleted => _deletedController.stream;

     

       74
       -
       

     

       75
       -
         void dispose() {

     

       76
       -
           _updatedController.close();

     

       77
       -
           _deletedController.close();

     

       78
       -
         }

     

       79
       -
       }

     

       80
       -
       ```

     

       81
       -
       

     

       82
       -
       ### 3. CachedGetter Implementation

     

       83
       -
       

     

       84
       -
       The `CachedGetter` is a critical component that ensures:

     

       85
       -
       - At most one token refresh happens at a time for a given user

     

       86
       -
       - Concurrent requests wait for in-flight refreshes

     

       87
       -
       - Stale values are detected and refreshed automatically

     

       88
       -
       - Errors trigger deletion when appropriate

     

       89
       -
       

     

       90
       -
       **Key Features**:

     

       91
       -
       - Generic `CachedGetter<K, V>` base class

     

       92
       -
       - `SessionGetter` extends `CachedGetter<AtprotoDid, Session>`

     

       93
       -
       - Pending request tracking prevents duplicate refreshes

     

       94
       -
       - Configurable staleness detection with randomization (reduces thundering herd)

     

       95
       -
       

     

       96
       -
       ### 4. Placeholder Types for Future Chunks

     

       97
       -
       

     

       98
       -
       Since this is Chunk 5 and some dependencies come from later chunks, we use placeholders:

     

       99
       -
       

     

       100
       -
       ```dart

     

       101
       -
       // In oauth_session.dart

     

       102
       -
       abstract class OAuthServerAgent {

     

       103
       -
         OAuthAuthorizationServerMetadata get serverMetadata;

     

       104
       -
         Map<String, dynamic> get dpopKey;

     

       105
       -
         String get authMethod;

     

       106
       -
         Future<void> revoke(String token);

     

       107
       -
         Future<TokenSet> refresh(TokenSet tokenSet);

     

       108
       -
       }

     

       109
       -
       

     

       110
       -
       // In session_getter.dart

     

       111
       -
       abstract class OAuthServerFactory {

     

       112
       -
         Future<OAuthServerAgent> fromIssuer(

     

       113
       -
           String issuer,

     

       114
       -
           String authMethod,

     

       115
       -
           Map<String, dynamic> dpopKey,

     

       116
       -
         );

     

       117
       -
       }

     

       118
       -
       

     

       119
       -
       abstract class Runtime {

     

       120
       -
         bool get hasImplementationLock;

     

       121
       -
         Future<T> usingLock<T>(String key, Future<T> Function() callback);

     

       122
       -
         Future<List<int>> sha256(List<int> data);

     

       123
       -
       }

     

       124
       -
       

     

       125
       -
       class OAuthResponseError implements Exception {

     

       126
       -
         final int status;

     

       127
       -
         final String? error;

     

       128
       -
         final String? errorDescription;

     

       129
       -
       }

     

       130
       -
       ```

     

       131
       -
       

     

       132
       -
       These will be replaced with actual implementations in later chunks.

     

       133
       -
       

     

       134
       -
       ### 5. Token Expiration Logic

     

       135
       -
       

     

       136
       -
       **TypeScript**:

     

       137
       -
       ```typescript

     

       138
       -
       expires_at != null &&

     

       139
       -
         new Date(expires_at).getTime() <

     

       140
       -
           Date.now() + 10e3 + 30e3 * Math.random()

     

       141
       -
       ```

     

       142
       -
       

     

       143
       -
       **Dart**:

     

       144
       -
       ```dart

     

       145
       -
       if (tokenSet.expiresAt == null) return false;

     

       146
       -
       

     

       147
       -
       final expiresAt = DateTime.parse(tokenSet.expiresAt!);

     

       148
       -
       final now = DateTime.now();

     

       149
       -
       

     

       150
       -
       // 10 seconds buffer + 0-30 seconds randomization

     

       151
       -
       final buffer = Duration(

     

       152
       -
         milliseconds: 10000 + (math.Random().nextDouble() * 30000).toInt(),

     

       153
       -
       );

     

       154
       -
       

     

       155
       -
       return expiresAt.isBefore(now.add(buffer));

     

       156
       -
       ```

     

       157
       -
       

     

       158
       -
       The randomization prevents multiple instances from refreshing simultaneously.

     

       159
       -
       

     

       160
       -
       ### 6. HTTP Client Integration

     

       161
       -
       

     

       162
       -
       **TypeScript** uses global `fetch`:

     

       163
       -
       ```typescript

     

       164
       -
       const response = await fetch(url, { method: 'POST', ... })

     

       165
       -
       ```

     

       166
       -
       

     

       167
       -
       **Dart** uses `package:http`:

     

       168
       -
       ```dart

     

       169
       -
       import 'package:http/http.dart' as http;

     

       170
       -
       

     

       171
       -
       final request = http.Request(method, url);

     

       172
       -
       request.headers.addAll(headers);

     

       173
       -
       request.body = body;

     

       174
       -
       final streamedResponse = await _httpClient.send(request);

     

       175
       -
       return await http.Response.fromStream(streamedResponse);

     

       176
       -
       ```

     

       177
       -
       

     

       178
       -
       ### 7. Record Types for Pending Results

     

       179
       -
       

     

       180
       -
       **TypeScript**:

     

       181
       -
       ```typescript

     

       182
       -
       type PendingItem<V> = Promise<{ value: V; isFresh: boolean }>

     

       183
       -
       ```

     

       184
       -
       

     

       185
       -
       **Dart (using Dart 3.0 records)**:

     

       186
       -
       ```dart

     

       187
       -
       class _PendingItem<V> {

     

       188
       -
         final Future<({V value, bool isFresh})> future;

     

       189
       -
         _PendingItem(this.future);

     

       190
       -
       }

     

       191
       -
       ```

     

       192
       -
       

     

       193
       -
       ## API Compatibility

     

       194
       -
       

     

       195
       -
       ### Session Management

     

       196
       -
       

     

       197
       -
       | TypeScript | Dart | Notes |

     

       198
       -
       |------------|------|-------|

     

       199
       -
       | `SessionGetter.getSession(sub, refresh?)` | `SessionGetter.getSession(sub, [refresh])` | Identical API |

     

       200
       -
       | `SessionGetter.addEventListener('updated', ...)` | `SessionGetter.onUpdated.listen(...)` | Stream-based |

     

       201
       -
       | `SessionGetter.addEventListener('deleted', ...)` | `SessionGetter.onDeleted.listen(...)` | Stream-based |

     

       202
       -
       

     

       203
       -
       ### OAuth Session

     

       204
       -
       

     

       205
       -
       | TypeScript | Dart | Notes |

     

       206
       -
       |------------|------|-------|

     

       207
       -
       | `session.getTokenInfo(refresh?)` | `session.getTokenInfo([refresh])` | Identical API |

     

       208
       -
       | `session.signOut()` | `session.signOut()` | Identical API |

     

       209
       -
       | `session.fetchHandler(pathname, init?)` | `session.fetchHandler(pathname, {method, headers, body})` | Named parameters |

     

       210
       -
       

     

       211
       -
       ## Testing Strategy

     

       212
       -
       

     

       213
       -
       The implementation compiles successfully with only 2 minor linting suggestions:

     

       214
       -
       - Use null-aware operator in one place (style preference)

     

       215
       -
       - Use `rethrow` in one catch block (style preference)

     

       216
       -
       

     

       217
       -
       Both are cosmetic and don't affect functionality.

     

       218
       -
       

     

       219
       -
       ### Manual Testing Checklist

     

       220
       -
       

     

       221
       -
       When later chunks provide concrete implementations:

     

       222
       -
       

     

       223
       -
       ```dart

     

       224
       -
       // 1. Create a session

     

       225
       -
       final session = Session(

     

       226
       -
         dpopKey: {'kty': 'EC', ...},

     

       227
       -
         authMethod: 'none',

     

       228
       -
         tokenSet: TokenSet(

     

       229
       -
           iss: 'https://bsky.social',

     

       230
       -
           sub: 'did:plc:abc123',

     

       231
       -
           aud: 'https://bsky.social',

     

       232
       -
           scope: 'atproto',

     

       233
       -
           accessToken: 'token',

     

       234
       -
           refreshToken: 'refresh',

     

       235
       -
           expiresAt: DateTime.now().add(Duration(hours: 1)).toIso8601String(),

     

       236
       -
         ),

     

       237
       -
       );

     

       238
       -
       

     

       239
       -
       // 2. Store in session getter

     

       240
       -
       await sessionGetter.setStored('did:plc:abc123', session);

     

       241
       -
       

     

       242
       -
       // 3. Retrieve (should not refresh)

     

       243
       -
       final retrieved = await sessionGetter.getSession('did:plc:abc123', false);

     

       244
       -
       assert(retrieved.tokenSet.accessToken == 'token');

     

       245
       -
       

     

       246
       -
       // 4. Force refresh

     

       247
       -
       final refreshed = await sessionGetter.getSession('did:plc:abc123', true);

     

       248
       -
       // Should have new tokens

     

       249
       -
       

     

       250
       -
       // 5. Check expiration

     

       251
       -
       assert(!session.tokenSet.isExpired);

     

       252
       -
       

     

       253
       -
       // 6. Delete

     

       254
       -
       await sessionGetter.delStored('did:plc:abc123');

     

       255
       -
       final deleted = await sessionGetter.getSession('did:plc:abc123');

     

       256
       -
       // Should throw or return null

     

       257
       -
       ```

     

       258
       -
       

     

       259
       -
       ## Security Considerations

     

       260
       -
       

     

       261
       -
       ### 1. Token Storage

     

       262
       -
       

     

       263
       -
       **Critical**: Tokens MUST be stored securely:

     

       264
       -
       ```dart

     

       265
       -
       // ❌ NEVER do this

     

       266
       -
       final prefs = await SharedPreferences.getInstance();

     

       267
       -
       await prefs.setString('token', tokenSet.toJson().toString());

     

       268
       -
       

     

       269
       -
       // ✅ Use flutter_secure_storage (implemented in Chunk 7)

     

       270
       -
       final storage = FlutterSecureStorage();

     

       271
       -
       await storage.write(

     

       272
       -
         key: 'session_$sub',

     

       273
       -
         value: jsonEncode(session.toJson()),

     

       274
       -
       );

     

       275
       -
       ```

     

       276
       -
       

     

       277
       -
       ### 2. Token Logging

     

       278
       -
       

     

       279
       -
       **Never log sensitive data**:

     

       280
       -
       ```dart

     

       281
       -
       // ❌ NEVER

     

       282
       -
       print('Access token: ${tokenSet.accessToken}');

     

       283
       -
       

     

       284
       -
       // ✅ Safe logging

     

       285
       -
       print('Token expires at: ${tokenSet.expiresAt}');

     

       286
       -
       print('Token type: ${tokenSet.tokenType}');

     

       287
       -
       ```

     

       288
       -
       

     

       289
       -
       ### 3. Session Lifecycle

     

       290
       -
       

     

       291
       -
       Sessions are automatically deleted when:

     

       292
       -
       - Token refresh fails with `invalid_grant`

     

       293
       -
       - Token is revoked by the server

     

       294
       -
       - User explicitly signs out

     

       295
       -
       - Token is marked invalid by resource server

     

       296
       -
       

     

       297
       -
       ### 4. Concurrency Protection

     

       298
       -
       

     

       299
       -
       The `SessionGetter` includes multiple layers of protection:

     

       300
       -
       1. **Runtime locks**: Prevent simultaneous refreshes across app instances

     

       301
       -
       2. **Pending request tracking**: Coalesce concurrent requests

     

       302
       -
       3. **Store-based detection**: Detect concurrent refreshes without locks

     

       303
       -
       4. **Randomized expiry**: Reduce thundering herd at startup

     

       304
       -
       

     

       305
       -
       ## Integration with Other Chunks

     

       306
       -
       

     

       307
       -
       ### Dependencies (Available)

     

       308
       -
       - ✅ Chunk 1: Error types (`TokenRefreshError`, `TokenRevokedError`, etc.)

     

       309
       -
       - ✅ Chunk 1: Utilities (`CustomEventTarget`, `CancellationToken`)

     

       310
       -
       - ✅ Chunk 1: Constants

     

       311
       -
       

     

       312
       -
       ### Dependencies (Future Chunks)

     

       313
       -
       - ⏳ Chunk 6: `OAuthServerAgent` implementation

     

       314
       -
       - ⏳ Chunk 7: `OAuthServerFactory` implementation

     

       315
       -
       - ⏳ Chunk 7: `Runtime` implementation

     

       316
       -
       - ⏳ Chunk 7: Concrete storage implementations (SecureSessionStore)

     

       317
       -
       - ⏳ Chunk 8: DPoP fetch wrapper integration

     

       318
       -
       

     

       319
       -
       ## File Structure

     

       320
       -
       

     

       321
       -
       ```

     

       322
       -
       lib/src/session/

     

       323
       -
       ├── state_store.dart          # OAuth state storage (PKCE, nonce, etc.)

     

       324
       -
       ├── oauth_session.dart         # Session types and OAuthSession class

     

       325
       -
       ├── session_getter.dart        # SessionGetter and CachedGetter

     

       326
       -
       └── session.dart              # Barrel file

     

       327
       -
       ```

     

       328
       -
       

     

       329
       -
       ## Next Steps

     

       330
       -
       

     

       331
       -
       For Chunk 6+:

     

       332
       -
       1. Implement `OAuthServerAgent` with actual token refresh logic

     

       333
       -
       2. Implement `OAuthServerFactory` for creating server agents

     

       334
       -
       3. Implement `Runtime` with platform-specific lock mechanisms

     

       335
       -
       4. Create concrete `SessionStore` using `flutter_secure_storage`

     

       336
       -
       5. Create concrete `StateStore` for ephemeral OAuth state

     

       337
       -
       6. Integrate DPoP proof generation in `fetchHandler`

     

       338
       -
       7. Add proper error handling for network failures

     

       339
       -
       8. Implement session migration for schema changes

     

       340
       -
       

     

       341
       -
       ## Performance Notes

     

       342
       -
       

     

       343
       -
       ### Memory Management

     

       344
       -
       - `SessionGetter` maintains a `_pending` map for in-flight requests

     

       345
       -
       - This map is automatically cleaned up when requests complete

     

       346
       -
       - Stream controllers must be disposed via `dispose()`

     

       347
       -
       - HTTP clients should be reused, not created per request

     

       348
       -
       

     

       349
       -
       ### Optimization Opportunities

     

       350
       -
       - The randomized expiry buffer (0-30s) spreads refresh load

     

       351
       -
       - Pending request coalescing reduces redundant network calls

     

       352
       -
       - Cached values avoid unnecessary store reads

     

       353
       -
       

     

       354
       -
       ## Known Limitations

     

       355
       -
       

     

       356
       -
       1. **No DPoP yet**: `fetchHandler` doesn't generate DPoP proofs (Chunk 8)

     

       357
       -
       2. **No actual refresh**: `OAuthServerAgent.refresh()` is a placeholder

     

       358
       -
       3. **No secure storage**: Storage implementations come in Chunk 7

     

       359
       -
       4. **No runtime locks**: Lock implementation comes in Chunk 7

     

       360
       -
       

     

       361
       -
       These are intentional - this chunk focuses on the session management *structure*, with concrete implementations following in later chunks.

     

       362
       -
       

     

       363
       -
       ## Conclusion

     

       364
       -
       

     

       365
       -
       Chunk 5 successfully implements the session management layer with:

     

       366
       -
       - ✅ Complete API compatibility with TypeScript

     

       367
       -
       - ✅ Proper abstractions for future implementations

     

       368
       -
       - ✅ Security-conscious design (even if storage is placeholder)

     

       369
       -
       - ✅ Event-driven architecture using Dart streams

     

       370
       -
       - ✅ Comprehensive error handling

     

       371
       -
       - ✅ Zero compilation errors

     

       372
       -
       

     

       373
       -
       The code is production-ready structurally and awaits concrete implementations from subsequent chunks.

-102

packages/atproto_oauth_flutter/IMPLEMENTATION_PLAN.md

···

       1
       -
       # Implementation Plan: atproto_oauth_flutter

     

       2
       -
       

     

       3
       -
       ## Overview

     

       4
       -
       1:1 port of `@atproto/oauth-client` from TypeScript to Dart/Flutter

     

       5
       -
       

     

       6
       -
       **Source:** `/home/bretton/Code/atproto/packages/oauth/oauth-client/`

     

       7
       -
       **Target:** `/home/bretton/Code/coves_flutter/packages/atproto_oauth_flutter/`

     

       8
       -
       

     

       9
       -
       ## Implementation Chunks

     

       10
       -
       

     

       11
       -
       ### Chunk 1: Foundation Layer ✅

     

       12
       -
       **Files to port:**

     

       13
       -
       - `src/constants.ts` → `lib/src/constants.dart`

     

       14
       -
       - `src/types.ts` → `lib/src/types.dart`

     

       15
       -
       - `src/errors/*.ts` → `lib/src/errors/*.dart`

     

       16
       -
       - `src/util.ts` → `lib/src/util.dart`

     

       17
       -
       

     

       18
       -
       **Dependencies:** None (pure types and utilities)

     

       19
       -
       **Estimated LOC:** ~300 lines

     

       20
       -
       

     

       21
       -
       ### Chunk 2: Crypto & DPoP Layer

     

       22
       -
       **Files to port:**

     

       23
       -
       - `src/runtime-implementation.ts` → `lib/src/runtime/runtime_implementation.dart`

     

       24
       -
       - `src/runtime.ts` → `lib/src/runtime/runtime.dart`

     

       25
       -
       - `src/fetch-dpop.ts` → `lib/src/dpop/fetch_dpop.dart`

     

       26
       -
       - `src/lock.ts` → `lib/src/utils/lock.dart`

     

       27
       -
       

     

       28
       -
       **Dependencies:** Chunk 1 (types, errors)

     

       29
       -
       **Dart packages:** `crypto`, `pointycastle`, `convert`

     

       30
       -
       **Estimated LOC:** ~500 lines

     

       31
       -
       

     

       32
       -
       ### Chunk 3: Identity Resolution

     

       33
       -
       **Files to port:**

     

       34
       -
       - `src/identity-resolver.ts` → `lib/src/identity/identity_resolver.dart`

     

       35
       -
       

     

       36
       -
       **Dependencies:** Chunk 1, Chunk 2

     

       37
       -
       **Estimated LOC:** ~200 lines

     

       38
       -
       

     

       39
       -
       ### Chunk 4: OAuth Protocol Layer

     

       40
       -
       **Files to port:**

     

       41
       -
       - `src/oauth-authorization-server-metadata-resolver.ts` → `lib/src/oauth/authorization_server_metadata_resolver.dart`

     

       42
       -
       - `src/oauth-protected-resource-metadata-resolver.ts` → `lib/src/oauth/protected_resource_metadata_resolver.dart`

     

       43
       -
       - `src/oauth-resolver.ts` → `lib/src/oauth/oauth_resolver.dart`

     

       44
       -
       - `src/oauth-client-auth.ts` → `lib/src/oauth/client_auth.dart`

     

       45
       -
       - `src/validate-client-metadata.ts` → `lib/src/oauth/validate_client_metadata.dart`

     

       46
       -
       - `src/oauth-callback-error.ts` → `lib/src/errors/oauth_callback_error.dart`

     

       47
       -
       - `src/oauth-resolver-error.ts` → `lib/src/errors/oauth_resolver_error.dart`

     

       48
       -
       - `src/oauth-response-error.ts` → `lib/src/errors/oauth_response_error.dart`

     

       49
       -
       

     

       50
       -
       **Dependencies:** Chunk 1, Chunk 2, Chunk 3

     

       51
       -
       **Estimated LOC:** ~800 lines

     

       52
       -
       

     

       53
       -
       ### Chunk 5: Session Management

     

       54
       -
       **Files to port:**

     

       55
       -
       - `src/session-getter.ts` → `lib/src/session/session_getter.dart`

     

       56
       -
       - `src/state-store.ts` → `lib/src/session/state_store.dart`

     

       57
       -
       - `src/oauth-session.ts` → `lib/src/session/oauth_session.dart`

     

       58
       -
       

     

       59
       -
       **Dependencies:** Chunk 1, Chunk 2

     

       60
       -
       **Estimated LOC:** ~400 lines

     

       61
       -
       

     

       62
       -
       ### Chunk 6: Core OAuth Client

     

       63
       -
       **Files to port:**

     

       64
       -
       - `src/oauth-server-agent.ts` → `lib/src/client/oauth_server_agent.dart`

     

       65
       -
       - `src/oauth-server-factory.ts` → `lib/src/client/oauth_server_factory.dart`

     

       66
       -
       - `src/oauth-client.ts` → `lib/src/client/oauth_client.dart`

     

       67
       -
       

     

       68
       -
       **Dependencies:** All previous chunks

     

       69
       -
       **Estimated LOC:** ~700 lines

     

       70
       -
       

     

       71
       -
       ### Chunk 7: Flutter Platform Layer (NEW)

     

       72
       -
       **Files to create:**

     

       73
       -
       - `lib/src/platform/flutter_stores.dart` - Secure storage implementations

     

       74
       -
       - `lib/src/platform/flutter_runtime.dart` - Flutter crypto implementations

     

       75
       -
       - `lib/src/platform/flutter_oauth_client.dart` - Flutter-specific client

     

       76
       -
       - `lib/atproto_oauth_flutter.dart` - Main export file

     

       77
       -
       

     

       78
       -
       **Dependencies:** All previous chunks, Flutter packages

     

       79
       -
       **Estimated LOC:** ~300 lines

     

       80
       -
       

     

       81
       -
       ## Agent Execution Plan

     

       82
       -
       

     

       83
       -
       Each chunk will be implemented by a sub-agent with:

     

       84
       -
       1. **Implementation Agent** - Ports TypeScript to Dart

     

       85
       -
       2. **Review Agent** - Reviews for bugs, best practices, API compatibility

     

       86
       -
       

     

       87
       -
       ## Success Criteria

     

       88
       -
       

     

       89
       -
       - [ ] All TypeScript files ported to Dart

     

       90
       -
       - [ ] API matches Expo package (same method signatures)

     

       91
       -
       - [ ] Zero compilation errors

     

       92
       -
       - [ ] Proper decentralization (PDS discovery works)

     

       93
       -
       - [ ] Works with bretton.dev (custom PDS)

     

       94
       -
       

     

       95
       -
       ## Testing Plan

     

       96
       -
       

     

       97
       -
       After all chunks complete:

     

       98
       -
       1. Unit tests for each module

     

       99
       -
       2. Integration test with bretton.dev

     

       100
       -
       3. Integration test with bsky.social

     

       101
       -
       4. Session persistence test

     

       102
       -
       5. Token refresh test

-394

packages/atproto_oauth_flutter/IMPLEMENTATION_STATUS.md

···

       1
       -
       # atproto_oauth_flutter - Implementation Status

     

       2
       -
       

     

       3
       -
       ## Overview

     

       4
       -
       

     

       5
       -
       This is a **complete 1:1 port** of the TypeScript `@atproto/oauth-client` package to Dart/Flutter.

     

       6
       -
       

     

       7
       -
       **Status**: ✅ **COMPLETE - Ready for Testing**

     

       8
       -
       

     

       9
       -
       All 7 chunks have been implemented and the library compiles without errors.

     

       10
       -
       

     

       11
       -
       ## Implementation Chunks

     

       12
       -
       

     

       13
       -
       ### ✅ Chunk 1: Foundation & Type System

     

       14
       -
       **Status**: Complete

     

       15
       -
       **Files**: 5 files, ~800 LOC

     

       16
       -
       **Location**: `lib/src/types.dart`, `lib/src/constants.dart`, etc.

     

       17
       -
       

     

       18
       -
       Core types and constants:

     

       19
       -
       - ClientMetadata, AuthorizeOptions, CallbackOptions

     

       20
       -
       - OAuth/OIDC constants

     

       21
       -
       - Utility functions (base64url, URL parsing, etc.)

     

       22
       -
       

     

       23
       -
       ### ✅ Chunk 2: Runtime & Crypto Abstractions

     

       24
       -
       **Status**: Complete

     

       25
       -
       **Files**: 4 files, ~500 LOC

     

       26
       -
       **Location**: `lib/src/runtime/`, `lib/src/utils/`

     

       27
       -
       

     

       28
       -
       Runtime abstractions:

     

       29
       -
       - RuntimeImplementation interface

     

       30
       -
       - Key interface (for JWT signing)

     

       31
       -
       - Lock implementation (for concurrency control)

     

       32
       -
       - PKCE generation, JWK thumbprints

     

       33
       -
       

     

       34
       -
       ### ✅ Chunk 3: Identity Resolution

     

       35
       -
       **Status**: Complete

     

       36
       -
       **Files**: 11 files, ~1,200 LOC

     

       37
       -
       **Location**: `lib/src/identity/`

     

       38
       -
       

     

       39
       -
       DID and handle resolution:

     

       40
       -
       - DID resolver (did:plc, did:web)

     

       41
       -
       - Handle resolver (XRPC-based)

     

       42
       -
       - DID document parsing

     

       43
       -
       - Caching with TTL

     

       44
       -
       

     

       45
       -
       ### ✅ Chunk 4: OAuth Metadata & Discovery

     

       46
       -
       **Status**: Complete

     

       47
       -
       **Files**: 5 files, ~800 LOC

     

       48
       -
       **Location**: `lib/src/oauth/`

     

       49
       -
       

     

       50
       -
       OAuth server discovery:

     

       51
       -
       - Authorization server metadata (/.well-known/oauth-authorization-server)

     

       52
       -
       - Protected resource metadata (/.well-known/oauth-protected-resource)

     

       53
       -
       - Client authentication negotiation

     

       54
       -
       - PAR (Pushed Authorization Request) support

     

       55
       -
       

     

       56
       -
       ### ✅ Chunk 5: DPoP (Demonstrating Proof of Possession)

     

       57
       -
       **Status**: Complete

     

       58
       -
       **Files**: 2 files, ~400 LOC

     

       59
       -
       **Location**: `lib/src/dpop/`

     

       60
       -
       

     

       61
       -
       DPoP implementation:

     

       62
       -
       - DPoP proof generation

     

       63
       -
       - Nonce management

     

       64
       -
       - Access token hash (ath claim)

     

       65
       -
       - Dio interceptor for automatic DPoP header injection

     

       66
       -
       

     

       67
       -
       ### ✅ Chunk 6: OAuth Flow & Session Management

     

       68
       -
       **Status**: Complete

     

       69
       -
       **Files**: 8 files, ~2,000 LOC

     

       70
       -
       **Location**: `lib/src/client/`, `lib/src/session/`, `lib/src/oauth/`

     

       71
       -
       

     

       72
       -
       Complete OAuth flow:

     

       73
       -
       - OAuthClient (main API)

     

       74
       -
       - Token management (access, refresh, ID tokens)

     

       75
       -
       - Session storage and retrieval

     

       76
       -
       - Automatic token refresh with concurrency control

     

       77
       -
       - Error handling and cleanup

     

       78
       -
       

     

       79
       -
       ### ✅ Chunk 7: Flutter Platform Layer (FINAL)

     

       80
       -
       **Status**: Complete

     

       81
       -
       **Files**: 4 files, ~1,100 LOC

     

       82
       -
       **Location**: `lib/src/platform/`

     

       83
       -
       

     

       84
       -
       Flutter-specific implementations:

     

       85
       -
       - FlutterOAuthClient (high-level API)

     

       86
       -
       - FlutterKey (EC keys with pointycastle)

     

       87
       -
       - FlutterRuntime (crypto operations)

     

       88
       -
       - FlutterSessionStore (secure storage)

     

       89
       -
       - In-memory caches with TTL

     

       90
       -
       

     

       91
       -
       ## Statistics

     

       92
       -
       

     

       93
       -
       ### Code

     

       94
       -
       - **Total Files**: ~40 Dart files

     

       95
       -
       - **Total Lines**: ~6,000 LOC (excluding tests)

     

       96
       -
       - **Core Library**: ~5,000 LOC

     

       97
       -
       - **Platform Layer**: ~1,100 LOC

     

       98
       -
       - **Examples**: ~200 LOC

     

       99
       -
       - **Documentation**: ~1,000 lines

     

       100
       -
       

     

       101
       -
       ### Compilation

     

       102
       -
       - ✅ **Zero errors**

     

       103
       -
       - ⚠️ 2 warnings (pre-existing, not from platform layer)

     

       104
       -
       - ℹ️ 68 info messages (style suggestions)

     

       105
       -
       

     

       106
       -
       ### Dependencies

     

       107
       -
       ```yaml

     

       108
       -
       dependencies:

     

       109
       -
         flutter_secure_storage: ^9.2.2  # Secure token storage

     

       110
       -
         flutter_web_auth_2: ^4.1.0      # Browser OAuth flow

     

       111
       -
         pointycastle: ^3.9.1             # EC cryptography

     

       112
       -
         crypto: ^3.0.3                   # SHA hashing

     

       113
       -
         dio: ^5.9.0                      # HTTP client

     

       114
       -
       ```

     

       115
       -
       

     

       116
       -
       ## API Surface

     

       117
       -
       

     

       118
       -
       ### High-Level API (Recommended)

     

       119
       -
       

     

       120
       -
       ```dart

     

       121
       -
       import 'package:atproto_oauth_flutter/atproto_oauth_flutter.dart';

     

       122
       -
       

     

       123
       -
       // Initialize

     

       124
       -
       final client = FlutterOAuthClient(

     

       125
       -
         clientMetadata: ClientMetadata(

     

       126
       -
           clientId: 'https://example.com/client-metadata.json',

     

       127
       -
           redirectUris: ['myapp://oauth/callback'],

     

       128
       -
         ),

     

       129
       -
       );

     

       130
       -
       

     

       131
       -
       // Sign in

     

       132
       -
       final session = await client.signIn('alice.bsky.social');

     

       133
       -
       

     

       134
       -
       // Restore

     

       135
       -
       final restored = await client.restore(session.sub);

     

       136
       -
       

     

       137
       -
       // Revoke

     

       138
       -
       await client.revoke(session.sub);

     

       139
       -
       ```

     

       140
       -
       

     

       141
       -
       ### Core API (Advanced)

     

       142
       -
       

     

       143
       -
       ```dart

     

       144
       -
       import 'package:atproto_oauth_flutter/atproto_oauth_flutter.dart';

     

       145
       -
       

     

       146
       -
       // Lower-level control with OAuthClient

     

       147
       -
       final client = OAuthClient(

     

       148
       -
         OAuthClientOptions(

     

       149
       -
           clientMetadata: {...},

     

       150
       -
           sessionStore: CustomSessionStore(),

     

       151
       -
           runtimeImplementation: CustomRuntime(),

     

       152
       -
           // ... full control over all components

     

       153
       -
         ),

     

       154
       -
       );

     

       155
       -
       

     

       156
       -
       // Manual flow

     

       157
       -
       final authUrl = await client.authorize('alice.bsky.social');

     

       158
       -
       // ... open browser, handle callback

     

       159
       -
       final result = await client.callback(params);

     

       160
       -
       ```

     

       161
       -
       

     

       162
       -
       ## Features Implemented

     

       163
       -
       

     

       164
       -
       ### OAuth 2.0 / OIDC

     

       165
       -
       - ✅ Authorization Code Flow with PKCE

     

       166
       -
       - ✅ Token refresh with automatic retry

     

       167
       -
       - ✅ Token revocation

     

       168
       -
       - ✅ PAR (Pushed Authorization Request)

     

       169
       -
       - ✅ Response modes (query, fragment)

     

       170
       -
       - ✅ State parameter (CSRF protection)

     

       171
       -
       - ✅ Nonce parameter (replay protection)

     

       172
       -
       

     

       173
       -
       ### atProto Specifics

     

       174
       -
       - ✅ DID resolution (did:plc, did:web)

     

       175
       -
       - ✅ Handle resolution (via XRPC)

     

       176
       -
       - ✅ PDS discovery

     

       177
       -
       - ✅ DPoP (Demonstrating Proof of Possession)

     

       178
       -
       - ✅ Multi-tenant authorization servers

     

       179
       -
       

     

       180
       -
       ### Security

     

       181
       -
       - ✅ Secure token storage (Keychain/EncryptedSharedPreferences)

     

       182
       -
       - ✅ DPoP key generation and signing

     

       183
       -
       - ✅ PKCE (code challenge/verifier)

     

       184
       -
       - ✅ Automatic session cleanup on errors

     

       185
       -
       - ✅ Concurrency control (lock for token refresh)

     

       186
       -
       - ✅ Input validation

     

       187
       -
       

     

       188
       -
       ### Platform

     

       189
       -
       - ✅ iOS support (URL schemes, Keychain)

     

       190
       -
       - ✅ Android support (Intent filters, EncryptedSharedPreferences)

     

       191
       -
       - ✅ FlutterWebAuth2 integration

     

       192
       -
       - ✅ Secure random number generation

     

       193
       -
       - ✅ EC key generation (ES256/ES384/ES512/ES256K)

     

       194
       -
       

     

       195
       -
       ## Testing Status

     

       196
       -
       

     

       197
       -
       ### Unit Tests

     

       198
       -
       - ❌ Not yet implemented

     

       199
       -
       - **Next step**: Add unit tests for core logic

     

       200
       -
       

     

       201
       -
       ### Integration Tests

     

       202
       -
       - ❌ Not yet implemented

     

       203
       -
       - **Next step**: Test with real OAuth servers

     

       204
       -
       

     

       205
       -
       ### Manual Testing

     

       206
       -
       - ⏳ **Ready for testing**

     

       207
       -
       - Test with: `bretton.dev` (your own atproto identity)

     

       208
       -
       

     

       209
       -
       ## Known Limitations

     

       210
       -
       

     

       211
       -
       ### 1. Key Serialization (Minor)

     

       212
       -
       DPoP keys are regenerated on app restart. This works but:

     

       213
       -
       - Old tokens require refresh (bound to old keys)

     

       214
       -
       - Slight performance impact

     

       215
       -
       

     

       216
       -
       **Impact**: Low - Automatic refresh handles this transparently

     

       217
       -
       **Fix**: Implement `Key.toJson()` / `Key.fromJson()` in `flutter_key.dart`

     

       218
       -
       

     

       219
       -
       ### 2. Local Lock Only (Minor)

     

       220
       -
       Lock is in-memory, doesn't work across:

     

       221
       -
       - Multiple isolates

     

       222
       -
       - Multiple processes

     

       223
       -
       

     

       224
       -
       **Impact**: Low - Most Flutter apps run in single isolate

     

       225
       -
       **Fix**: Implement platform-specific lock if needed

     

       226
       -
       

     

       227
       -
       ### 3. No Token Caching (Minor)

     

       228
       -
       Tokens aren't cached in memory between requests.

     

       229
       -
       

     

       230
       -
       **Impact**: Low - Secure storage is fast enough

     

       231
       -
       **Fix**: Add in-memory token cache if performance is critical

     

       232
       -
       

     

       233
       -
       ## Next Steps

     

       234
       -
       

     

       235
       -
       ### Immediate (Before Production)

     

       236
       -
       1. ✅ **Complete implementation** - DONE

     

       237
       -
       2. ⏳ **Manual testing** - Test sign-in flow with bretton.dev

     

       238
       -
       3. ⏳ **Add unit tests** - Test core OAuth logic

     

       239
       -
       4. ⏳ **Add integration tests** - Test with real servers

     

       240
       -
       

     

       241
       -
       ### Short-term

     

       242
       -
       5. Fix key serialization (implement `Key.toJson()` / `fromJson()`)

     

       243
       -
       6. Add comprehensive error handling examples

     

       244
       -
       7. Add token introspection support

     

       245
       -
       8. Add more example apps

     

       246
       -
       

     

       247
       -
       ### Long-term

     

       248
       -
       9. Implement platform-specific locks (iOS/Android)

     

       249
       -
       10. Add biometric authentication option

     

       250
       -
       11. Add background token refresh

     

       251
       -
       12. Performance optimizations (token caching)

     

       252
       -
       

     

       253
       -
       ## Files Created (Chunk 7)

     

       254
       -
       

     

       255
       -
       ### Core Platform Files

     

       256
       -
       1. **`lib/src/platform/flutter_key.dart`** (429 lines)

     

       257
       -
          - EC key implementation with pointycastle

     

       258
       -
          - JWT signing (ES256/ES384/ES512/ES256K)

     

       259
       -
          - Key serialization (to/from JWK)

     

       260
       -
       

     

       261
       -
       2. **`lib/src/platform/flutter_runtime.dart`** (91 lines)

     

       262
       -
          - RuntimeImplementation for Flutter

     

       263
       -
          - SHA hashing with crypto package

     

       264
       -
          - Secure random number generation

     

       265
       -
          - Local lock integration

     

       266
       -
       

     

       267
       -
       3. **`lib/src/platform/flutter_stores.dart`** (355 lines)

     

       268
       -
          - FlutterSessionStore (secure storage)

     

       269
       -
          - FlutterStateStore (ephemeral state)

     

       270
       -
          - In-memory caches (metadata, nonces, DIDs, handles)

     

       271
       -
       

     

       272
       -
       4. **`lib/src/platform/flutter_oauth_client.dart`** (235 lines)

     

       273
       -
          - High-level FlutterOAuthClient

     

       274
       -
          - Simplified sign-in API

     

       275
       -
          - FlutterWebAuth2 integration

     

       276
       -
          - Sensible defaults

     

       277
       -
       

     

       278
       -
       ### Documentation

     

       279
       -
       5. **`lib/src/platform/README.md`** (~300 lines)

     

       280
       -
          - Architecture overview

     

       281
       -
          - Security features

     

       282
       -
          - Usage examples

     

       283
       -
          - Platform setup instructions

     

       284
       -
       

     

       285
       -
       6. **`example/flutter_oauth_example.dart`** (~200 lines)

     

       286
       -
          - Complete usage example

     

       287
       -
          - All OAuth flows demonstrated

     

       288
       -
          - Platform configuration examples

     

       289
       -
       

     

       290
       -
       7. **`lib/atproto_oauth_flutter.dart`** (updated)

     

       291
       -
          - Clean public API exports

     

       292
       -
          - Comprehensive library documentation

     

       293
       -
       

     

       294
       -
       ## Security Review

     

       295
       -
       

     

       296
       -
       ### ✅ Secure Storage

     

       297
       -
       - Tokens stored in flutter_secure_storage

     

       298
       -
       - iOS: Keychain with device encryption

     

       299
       -
       - Android: EncryptedSharedPreferences (AES-256)

     

       300
       -
       

     

       301
       -
       ### ✅ Cryptography

     

       302
       -
       - pointycastle for EC key generation (NIST curves)

     

       303
       -
       - crypto package for SHA hashing (FIPS 140-2 compliant)

     

       304
       -
       - Random.secure() for randomness (cryptographically secure)

     

       305
       -
       

     

       306
       -
       ### ✅ Token Binding

     

       307
       -
       - DPoP binds tokens to cryptographic keys

     

       308
       -
       - Every request includes signed proof

     

       309
       -
       - Prevents token theft

     

       310
       -
       

     

       311
       -
       ### ✅ Authorization Code Protection

     

       312
       -
       - PKCE with SHA-256 challenge

     

       313
       -
       - State parameter for CSRF protection

     

       314
       -
       - Nonce parameter for replay protection

     

       315
       -
       

     

       316
       -
       ### ✅ Concurrency Safety

     

       317
       -
       - Lock prevents concurrent token refresh

     

       318
       -
       - Automatic retry on refresh failure

     

       319
       -
       - Session cleanup on errors

     

       320
       -
       

     

       321
       -
       ## Production Readiness Checklist

     

       322
       -
       

     

       323
       -
       ### Code Quality

     

       324
       -
       - ✅ Zero compilation errors

     

       325
       -
       - ✅ Clean architecture (separation of concerns)

     

       326
       -
       - ✅ Comprehensive documentation

     

       327
       -
       - ✅ Type safety (null safety enabled)

     

       328
       -
       - ✅ Error handling throughout

     

       329
       -
       

     

       330
       -
       ### Security

     

       331
       -
       - ✅ Secure storage implementation

     

       332
       -
       - ✅ Proper cryptography (NIST curves, SHA-256+)

     

       333
       -
       - ✅ DPoP implementation

     

       334
       -
       - ✅ PKCE implementation

     

       335
       -
       - ✅ Input validation

     

       336
       -
       

     

       337
       -
       ### Functionality

     

       338
       -
       - ✅ Complete OAuth 2.0 flow

     

       339
       -
       - ✅ Token refresh

     

       340
       -
       - ✅ Token revocation

     

       341
       -
       - ✅ Session management

     

       342
       -
       - ✅ Identity resolution

     

       343
       -
       

     

       344
       -
       ### Platform Support

     

       345
       -
       - ✅ iOS support

     

       346
       -
       - ✅ Android support

     

       347
       -
       - ✅ Flutter 3.7.2+ compatible

     

       348
       -
       - ✅ Null safety enabled

     

       349
       -
       

     

       350
       -
       ### Documentation

     

       351
       -
       - ✅ API documentation

     

       352
       -
       - ✅ Usage examples

     

       353
       -
       - ✅ Platform setup guides

     

       354
       -
       - ✅ Security documentation

     

       355
       -
       

     

       356
       -
       ### Testing (TODO)

     

       357
       -
       - ⏳ Unit tests

     

       358
       -
       - ⏳ Integration tests

     

       359
       -
       - ⏳ Manual testing with real servers

     

       360
       -
       

     

       361
       -
       ## Comparison with TypeScript Original

     

       362
       -
       

     

       363
       -
       This Dart port maintains **1:1 feature parity** with the TypeScript implementation:

     

       364
       -
       

     

       365
       -
       | Feature | TypeScript | Dart/Flutter | Notes |

     

       366
       -
       |---------|-----------|--------------|-------|

     

       367
       -
       | OAuth 2.0 Core | ✅ | ✅ | Complete |

     

       368
       -
       | PKCE | ✅ | ✅ | SHA-256 |

     

       369
       -
       | DPoP | ✅ | ✅ | ES256/ES384/ES512/ES256K |

     

       370
       -
       | PAR | ✅ | ✅ | Pushed Authorization |

     

       371
       -
       | Token Refresh | ✅ | ✅ | With concurrency control |

     

       372
       -
       | DID Resolution | ✅ | ✅ | did:plc, did:web |

     

       373
       -
       | Handle Resolution | ✅ | ✅ | XRPC-based |

     

       374
       -
       | Secure Storage | ✅ (MMKV) | ✅ (flutter_secure_storage) | Platform-specific |

     

       375
       -
       | Crypto | ✅ (Web Crypto) | ✅ (pointycastle + crypto) | Platform-specific |

     

       376
       -
       | Key Serialization | ✅ | ⏳ | Minor limitation |

     

       377
       -
       

     

       378
       -
       ## Conclusion

     

       379
       -
       

     

       380
       -
       **The atproto_oauth_flutter library is COMPLETE and ready for testing!**

     

       381
       -
       

     

       382
       -
       All core functionality has been implemented with:

     

       383
       -
       - ✅ Zero errors

     

       384
       -
       - ✅ Production-grade security

     

       385
       -
       - ✅ Clean API

     

       386
       -
       - ✅ Comprehensive documentation

     

       387
       -
       

     

       388
       -
       **Next milestone**: Manual testing with bretton.dev OAuth flow.

     

       389
       -
       

     

       390
       -
       ---

     

       391
       -
       

     

       392
       -
       Generated: 2025-10-27

     

       393
       -
       Chunk 7 (FINAL): Flutter Platform Layer

     

       394
       -
       Status: ✅ **COMPLETE**

-1238

packages/atproto_oauth_flutter/README.md

···

       1
       -
       # atproto_oauth_flutter

     

       2
       -
       

     

       3
       -
       **Official AT Protocol OAuth client for Flutter** - A complete 1:1 port of the TypeScript `@atproto/oauth-client` package.

     

       4
       -
       

     

       5
       -
       [![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE)

     

       6
       -
       

     

       7
       -
       ## Table of Contents

     

       8
       -
       

     

       9
       -
       - [Overview](#overview)

     

       10
       -
       - [Why This Package?](#why-this-package)

     

       11
       -
       - [Features](#features)

     

       12
       -
       - [Installation](#installation)

     

       13
       -
       - [Quick Start](#quick-start)

     

       14
       -
       - [Platform Setup](#platform-setup)

     

       15
       -
         - [iOS Configuration](#ios-configuration)

     

       16
       -
         - [Android Configuration](#android-configuration)

     

       17
       -
         - [Router Integration](#router-integration-go_router-auto_route-etc)

     

       18
       -
       - [API Reference](#api-reference)

     

       19
       -
         - [FlutterOAuthClient (High-Level)](#flutteroauthclient-high-level)

     

       20
       -
         - [OAuthClient (Core)](#oauthclient-core)

     

       21
       -
         - [Types](#types)

     

       22
       -
         - [Errors](#errors)

     

       23
       -
       - [Usage Guide](#usage-guide)

     

       24
       -
         - [Sign In Flow](#sign-in-flow)

     

       25
       -
         - [Session Restoration](#session-restoration)

     

       26
       -
         - [Token Refresh](#token-refresh)

     

       27
       -
         - [Sign Out (Revoke)](#sign-out-revoke)

     

       28
       -
         - [Session Events](#session-events)

     

       29
       -
       - [Advanced Usage](#advanced-usage)

     

       30
       -
         - [Custom Storage Configuration](#custom-storage-configuration)

     

       31
       -
         - [Direct OAuthClient Usage](#direct-oauthclient-usage)

     

       32
       -
         - [Custom Identity Resolution](#custom-identity-resolution)

     

       33
       -
       - [Decentralization Explained](#decentralization-explained)

     

       34
       -
       - [Security Features](#security-features)

     

       35
       -
       - [OAuth Flows](#oauth-flows)

     

       36
       -
       - [Troubleshooting](#troubleshooting)

     

       37
       -
       - [Migration Guide](#migration-guide)

     

       38
       -
       - [Architecture](#architecture)

     

       39
       -
       - [Examples](#examples)

     

       40
       -
       - [Contributing](#contributing)

     

       41
       -
       - [License](#license)

     

       42
       -
       

     

       43
       -
       ## Overview

     

       44
       -
       

     

       45
       -
       `atproto_oauth_flutter` is a complete OAuth 2.0 + OpenID Connect client for the AT Protocol, designed specifically for Flutter applications. It handles the full authentication lifecycle including:

     

       46
       -
       

     

       47
       -
       - **Complete OAuth 2.0 Flow** - Authorization Code Flow with PKCE

     

       48
       -
       - **Automatic Token Management** - Refresh tokens automatically, handle expiration gracefully

     

       49
       -
       - **Secure Storage** - iOS Keychain and Android EncryptedSharedPreferences

     

       50
       -
       - **DPoP Security** - Token binding with cryptographic proof-of-possession

     

       51
       -
       - **Decentralized Discovery** - Works with ANY atProto PDS, not just bsky.social

     

       52
       -
       - **Production Ready** - Based on Bluesky's official TypeScript implementation

     

       53
       -
       

     

       54
       -
       ## Why This Package?

     

       55
       -
       

     

       56
       -
       ### The Problem with Existing Packages

     

       57
       -
       

     

       58
       -
       The existing `atproto_oauth` package has a **critical flaw**: it **hardcodes `bsky.social`** as the OAuth provider. This breaks the decentralized nature of the AT Protocol.

     

       59
       -
       

     

       60
       -
       **What this means:**

     

       61
       -
       - ❌ Only works with Bluesky's servers

     

       62
       -
       - ❌ Can't authenticate users on custom PDS instances

     

       63
       -
       - ❌ Defeats the purpose of decentralization

     

       64
       -
       - ❌ Your app won't work with the broader atProto ecosystem

     

       65
       -
       

     

       66
       -
       ### How This Package Solves It

     

       67
       -
       

     

       68
       -
       `atproto_oauth_flutter` implements **proper decentralized OAuth discovery**:

     

       69
       -
       

     

       70
       -
       ```dart

     

       71
       -
       // ✅ Works with ANY PDS:

     

       72
       -
       await client.signIn('alice.bsky.social');    // → https://bsky.app

     

       73
       -
       await client.signIn('bob.custom-pds.com');   // → https://custom-pds.com

     

       74
       -
       await client.signIn('bretton.dev');          // → https://pds.bretton.dev ✅

     

       75
       -
       

     

       76
       -
       // The library automatically:

     

       77
       -
       // 1. Resolves handle → DID

     

       78
       -
       // 2. Fetches DID document

     

       79
       -
       // 3. Discovers PDS URL

     

       80
       -
       // 4. Discovers authorization server

     

       81
       -
       // 5. Completes OAuth flow with the correct server

     

       82
       -
       ```

     

       83
       -
       

     

       84
       -
       **Bottom line:** This is the only Flutter package that properly implements decentralized atProto OAuth.

     

       85
       -
       

     

       86
       -
       ## Features

     

       87
       -
       

     

       88
       -
       ### OAuth 2.0 / OIDC Compliance

     

       89
       -
       - ✅ Authorization Code Flow with PKCE (SHA-256)

     

       90
       -
       - ✅ Automatic token refresh with concurrency control

     

       91
       -
       - ✅ Token revocation (best-effort)

     

       92
       -
       - ✅ PAR (Pushed Authorization Request) support

     

       93
       -
       - ✅ Response modes: query, fragment

     

       94
       -
       - ✅ State parameter (CSRF protection)

     

       95
       -
       - ✅ Nonce parameter (replay protection)

     

       96
       -
       

     

       97
       -
       ### atProto Specifics

     

       98
       -
       - ✅ **DID Resolution** - Supports `did:plc` and `did:web`

     

       99
       -
       - ✅ **Handle Resolution** - XRPC-based handle → DID resolution

     

       100
       -
       - ✅ **PDS Discovery** - Automatic PDS discovery from DID documents

     

       101
       -
       - ✅ **DPoP (Demonstrating Proof of Possession)** - Cryptographic token binding

     

       102
       -
       - ✅ **Multi-tenant Auth Servers** - Works with any authorization server

     

       103
       -
       

     

       104
       -
       ### Security

     

       105
       -
       - ✅ **Secure Storage** - iOS Keychain, Android EncryptedSharedPreferences

     

       106
       -
       - ✅ **DPoP Key Generation** - EC keys (ES256/ES384/ES512/ES256K)

     

       107
       -
       - ✅ **PKCE** - SHA-256 code challenge/verifier

     

       108
       -
       - ✅ **Automatic Cleanup** - Sessions deleted on errors

     

       109
       -
       - ✅ **Concurrency Control** - Lock prevents simultaneous token refresh

     

       110
       -
       - ✅ **Input Validation** - All inputs validated before use

     

       111
       -
       

     

       112
       -
       ### Platform Support

     

       113
       -
       - ✅ iOS (11.0+) with Keychain storage

     

       114
       -
       - ✅ Android (API 21+) with EncryptedSharedPreferences

     

       115
       -
       - ✅ Deep linking (custom URL schemes + HTTPS)

     

       116
       -
       - ✅ Flutter 3.7.2+ with null safety

     

       117
       -
       

     

       118
       -
       ## Installation

     

       119
       -
       

     

       120
       -
       Add this to your `pubspec.yaml`:

     

       121
       -
       

     

       122
       -
       ```yaml

     

       123
       -
       dependencies:

     

       124
       -
         atproto_oauth_flutter:

     

       125
       -
           path: packages/atproto_oauth_flutter  # For local development

     

       126
       -
       

     

       127
       -
           # OR (when published to pub.dev):

     

       128
       -
           # atproto_oauth_flutter: ^0.1.0

     

       129
       -
       ```

     

       130
       -
       

     

       131
       -
       Then install:

     

       132
       -
       

     

       133
       -
       ```bash

     

       134
       -
       flutter pub get

     

       135
       -
       ```

     

       136
       -
       

     

       137
       -
       ## Quick Start

     

       138
       -
       

     

       139
       -
       Here's a complete working example to get you started in 5 minutes:

     

       140
       -
       

     

       141
       -
       ```dart

     

       142
       -
       import 'package:atproto_oauth_flutter/atproto_oauth_flutter.dart';

     

       143
       -
       

     

       144
       -
       void main() async {

     

       145
       -
         // 1. Initialize the client

     

       146
       -
         final client = FlutterOAuthClient(

     

       147
       -
           clientMetadata: ClientMetadata(

     

       148
       -
             clientId: 'http://localhost',  // For development

     

       149
       -
             redirectUris: ['myapp://oauth/callback'],

     

       150
       -
             scope: 'atproto transition:generic',

     

       151
       -
           ),

     

       152
       -
         );

     

       153
       -
       

     

       154
       -
         // 2. Sign in with a handle

     

       155
       -
         try {

     

       156
       -
           final session = await client.signIn('alice.bsky.social');

     

       157
       -
           print('Signed in as: ${session.sub}');

     

       158
       -
       

     

       159
       -
           // 3. Use the session for authenticated requests

     

       160
       -
           final info = await session.getTokenInfo();

     

       161
       -
           print('Token expires: ${info.expiresAt}');

     

       162
       -
       

     

       163
       -
         } on OAuthCallbackError catch (e) {

     

       164
       -
           print('OAuth error: ${e.error} - ${e.errorDescription}');

     

       165
       -
         }

     

       166
       -
       

     

       167
       -
         // 4. Later: restore session on app restart

     

       168
       -
         final restored = await client.restore('did:plc:abc123');

     

       169
       -
       

     

       170
       -
         // 5. Sign out

     

       171
       -
         await client.revoke('did:plc:abc123');

     

       172
       -
       }

     

       173
       -
       ```

     

       174
       -
       

     

       175
       -
       **Next step:** Configure platform deep linking (see [Platform Setup](#platform-setup)).

     

       176
       -
       

     

       177
       -
       ## Platform Setup

     

       178
       -
       

     

       179
       -
       OAuth requires deep linking to redirect back to your app after authentication. You must configure both platforms:

     

       180
       -
       

     

       181
       -
       ### iOS Configuration

     

       182
       -
       

     

       183
       -
       Add a custom URL scheme to `ios/Runner/Info.plist`:

     

       184
       -
       

     

       185
       -
       ```xml

     

       186
       -
       <key>CFBundleURLTypes</key>

     

       187
       -
       <array>

     

       188
       -
         <dict>

     

       189
       -
           <key>CFBundleURLSchemes</key>

     

       190
       -
           <array>

     

       191
       -
             <string>myapp</string>  <!-- Your custom scheme -->

     

       192
       -
           </array>

     

       193
       -
           <key>CFBundleURLName</key>

     

       194
       -
           <string>com.example.myapp</string>

     

       195
       -
         </dict>

     

       196
       -
       </array>

     

       197
       -
       ```

     

       198
       -
       

     

       199
       -
       **For HTTPS universal links** (production), also add:

     

       200
       -
       

     

       201
       -
       ```xml

     

       202
       -
       <key>com.apple.developer.associated-domains</key>

     

       203
       -
       <array>

     

       204
       -
         <string>applinks:example.com</string>

     

       205
       -
       </array>

     

       206
       -
       ```

     

       207
       -
       

     

       208
       -
       Then create an `apple-app-site-association` file on your server at `https://example.com/.well-known/apple-app-site-association`.

     

       209
       -
       

     

       210
       -
       ### Android Configuration

     

       211
       -
       

     

       212
       -
       Add an intent filter to `android/app/src/main/AndroidManifest.xml`:

     

       213
       -
       

     

       214
       -
       ```xml

     

       215
       -
       <activity

     

       216
       -
           android:name=".MainActivity"

     

       217
       -
           ...>

     

       218
       -
       

     

       219
       -
           <!-- Existing intent filters -->

     

       220
       -
       

     

       221
       -
           <!-- OAuth callback intent filter -->

     

       222
       -
           <intent-filter>

     

       223
       -
               <action android:name="android.intent.action.VIEW" />

     

       224
       -
               <category android:name="android.intent.category.DEFAULT" />

     

       225
       -
               <category android:name="android.intent.category.BROWSABLE" />

     

       226
       -
       

     

       227
       -
               <!-- Custom URL scheme -->

     

       228
       -
               <data android:scheme="myapp" />

     

       229
       -
           </intent-filter>

     

       230
       -
       

     

       231
       -
           <!-- For HTTPS universal links (production) -->

     

       232
       -
           <intent-filter android:autoVerify="true">

     

       233
       -
               <action android:name="android.intent.action.VIEW" />

     

       234
       -
               <category android:name="android.intent.category.DEFAULT" />

     

       235
       -
               <category android:name="android.intent.category.BROWSABLE" />

     

       236
       -
       

     

       237
       -
               <data android:scheme="https" />

     

       238
       -
               <data android:host="example.com" />

     

       239
       -
               <data android:pathPrefix="/oauth/callback" />

     

       240
       -
           </intent-filter>

     

       241
       -
       </activity>

     

       242
       -
       ```

     

       243
       -
       

     

       244
       -
       **For HTTPS universal links**, also create a `assetlinks.json` file at `https://example.com/.well-known/assetlinks.json`.

     

       245
       -
       

     

       246
       -
       ### Verify Deep Linking

     

       247
       -
       

     

       248
       -
       Test that deep linking works:

     

       249
       -
       

     

       250
       -
       ```bash

     

       251
       -
       # iOS (simulator)

     

       252
       -
       xcrun simctl openurl booted "myapp://oauth/callback?code=test"

     

       253
       -
       

     

       254
       -
       # Android (emulator or device)

     

       255
       -
       adb shell am start -W -a android.intent.action.VIEW -d "myapp://oauth/callback?code=test"

     

       256
       -
       ```

     

       257
       -
       

     

       258
       -
       If your app opens, deep linking is configured correctly.

     

       259
       -
       

     

       260
       -
       ### Router Integration (go_router, auto_route, etc.)

     

       261
       -
       

     

       262
       -
       **⚠️ Important:** If you're using declarative routing packages like `go_router` or `auto_route`, you MUST configure them to ignore OAuth callback deep links. Otherwise, the router will intercept the callback and OAuth will fail with "User canceled login".

     

       263
       -
       

     

       264
       -
       #### Why This is Needed

     

       265
       -
       

     

       266
       -
       When the OAuth server redirects back to your app with the authorization code, your router may try to handle the deep link before `flutter_web_auth_2` can capture it. This causes the OAuth flow to fail.

     

       267
       -
       

     

       268
       -
       #### Solution: Use FlutterOAuthRouterHelper

     

       269
       -
       

     

       270
       -
       We provide a helper that makes router configuration easy:

     

       271
       -
       

     

       272
       -
       **With go_router** (Recommended approach):

     

       273
       -
       

     

       274
       -
       ```dart

     

       275
       -
       import 'package:atproto_oauth_flutter/atproto_oauth_flutter.dart';

     

       276
       -
       import 'package:go_router/go_router.dart';

     

       277
       -
       

     

       278
       -
       final router = GoRouter(

     

       279
       -
         routes: [

     

       280
       -
           // Your app routes...

     

       281
       -
         ],

     

       282
       -
         // Use the helper to automatically ignore OAuth callbacks

     

       283
       -
         redirect: FlutterOAuthRouterHelper.createGoRouterRedirect(

     

       284
       -
           customSchemes: ['myapp'], // Your custom URL scheme(s)

     

       285
       -
         ),

     

       286
       -
       );

     

       287
       -
       ```

     

       288
       -
       

     

       289
       -
       **Manual configuration** (if you need custom redirect logic):

     

       290
       -
       

     

       291
       -
       ```dart

     

       292
       -
       final router = GoRouter(

     

       293
       -
         routes: [...],

     

       294
       -
         redirect: (context, state) {

     

       295
       -
           // Check if this is an OAuth callback

     

       296
       -
           if (FlutterOAuthRouterHelper.isOAuthCallback(

     

       297
       -
             state.uri,

     

       298
       -
             customSchemes: ['myapp'],

     

       299
       -
           )) {

     

       300
       -
             return null; // Let flutter_web_auth_2 handle it

     

       301
       -
           }

     

       302
       -
       

     

       303
       -
           // Your custom redirect logic here

     

       304
       -
           if (!isAuthenticated) return '/login';

     

       305
       -
       

     

       306
       -
           return null; // Normal routing

     

       307
       -
         },

     

       308
       -
       );

     

       309
       -
       ```

     

       310
       -
       

     

       311
       -
       **Extract scheme from your OAuth config:**

     

       312
       -
       

     

       313
       -
       ```dart

     

       314
       -
       final scheme = FlutterOAuthRouterHelper.extractScheme(

     

       315
       -
         'myapp://oauth/callback'

     

       316
       -
       );

     

       317
       -
       // Returns: 'myapp'

     

       318
       -
       

     

       319
       -
       // Use it in your router config

     

       320
       -
       redirect: FlutterOAuthRouterHelper.createGoRouterRedirect(

     

       321
       -
         customSchemes: [scheme],

     

       322
       -
       ),

     

       323
       -
       ```

     

       324
       -
       

     

       325
       -
       #### Other Routers

     

       326
       -
       

     

       327
       -
       The same concept applies to other routing packages:

     

       328
       -
       

     

       329
       -
       - **auto_route**: Use guards to ignore OAuth callback routes

     

       330
       -
       - **beamer**: Configure `beamGuard` to skip OAuth URIs

     

       331
       -
       - **fluro**: Add a custom route handler that ignores OAuth schemes

     

       332
       -
       

     

       333
       -
       The key is to **not process URIs with your custom OAuth scheme** - let `flutter_web_auth_2` handle them.

     

       334
       -
       

     

       335
       -
       ## API Reference

     

       336
       -
       

     

       337
       -
       ### FlutterOAuthClient (High-Level)

     

       338
       -
       

     

       339
       -
       **Recommended for most apps.** Provides a simplified API with sensible defaults.

     

       340
       -
       

     

       341
       -
       #### Constructor

     

       342
       -
       

     

       343
       -
       ```dart

     

       344
       -
       FlutterOAuthClient({

     

       345
       -
         required ClientMetadata clientMetadata,

     

       346
       -
         OAuthResponseMode responseMode = OAuthResponseMode.query,

     

       347
       -
         bool allowHttp = false,

     

       348
       -
         FlutterSecureStorage? secureStorage,

     

       349
       -
         Dio? dio,

     

       350
       -
         String? plcDirectoryUrl,

     

       351
       -
         String? handleResolverUrl,

     

       352
       -
       })

     

       353
       -
       ```

     

       354
       -
       

     

       355
       -
       **Parameters:**

     

       356
       -
       

     

       357
       -
       - `clientMetadata` (required) - Client configuration (see [ClientMetadata](#clientmetadata))

     

       358
       -
       - `responseMode` - How OAuth parameters are returned: `query` (default, URL query string) or `fragment` (URL fragment)

     

       359
       -
       - `allowHttp` - Allow HTTP connections for development (default: `false`, **never use in production**)

     

       360
       -
       - `secureStorage` - Custom `FlutterSecureStorage` instance (optional)

     

       361
       -
       - `dio` - Custom HTTP client (optional)

     

       362
       -
       - `plcDirectoryUrl` - Custom PLC directory URL (default: `https://plc.directory`)

     

       363
       -
       - `handleResolverUrl` - Custom handle resolver URL (default: `https://bsky.social`)

     

       364
       -
       

     

       365
       -
       #### Methods

     

       366
       -
       

     

       367
       -
       ##### `signIn()`

     

       368
       -
       

     

       369
       -
       Complete OAuth sign-in flow (authorize + browser + callback).

     

       370
       -
       

     

       371
       -
       ```dart

     

       372
       -
       Future<OAuthSession> signIn(

     

       373
       -
         String input, {

     

       374
       -
         AuthorizeOptions? options,

     

       375
       -
         CancelToken? cancelToken,

     

       376
       -
       })

     

       377
       -
       ```

     

       378
       -
       

     

       379
       -
       **Parameters:**

     

       380
       -
       

     

       381
       -
       - `input` - Handle (e.g., `"alice.bsky.social"`), DID (e.g., `"did:plc:..."`), PDS URL, or auth server URL

     

       382
       -
       - `options` - Additional OAuth parameters (optional, see [AuthorizeOptions](#authorizeoptions))

     

       383
       -
       - `cancelToken` - Dio cancellation token (optional)

     

       384
       -
       

     

       385
       -
       **Returns:** `OAuthSession` - Authenticated session

     

       386
       -
       

     

       387
       -
       **Throws:**

     

       388
       -
       - `FormatException` - Invalid parameters

     

       389
       -
       - `OAuthResolverError` - Identity/server resolution failed

     

       390
       -
       - `OAuthCallbackError` - OAuth error from server

     

       391
       -
       - `FlutterWebAuth2UserCanceled` - User cancelled browser flow

     

       392
       -
       

     

       393
       -
       **Example:**

     

       394
       -
       

     

       395
       -
       ```dart

     

       396
       -
       // Simple sign-in

     

       397
       -
       final session = await client.signIn('alice.bsky.social');

     

       398
       -
       

     

       399
       -
       // With custom state

     

       400
       -
       final session = await client.signIn(

     

       401
       -
         'alice.bsky.social',

     

       402
       -
         options: AuthorizeOptions(state: 'my-app-state'),

     

       403
       -
       );

     

       404
       -
       ```

     

       405
       -
       

     

       406
       -
       ##### `restore()`

     

       407
       -
       

     

       408
       -
       Restore a stored session (automatically refreshes if expired).

     

       409
       -
       

     

       410
       -
       ```dart

     

       411
       -
       Future<OAuthSession> restore(

     

       412
       -
         String sub, {

     

       413
       -
         dynamic refresh = 'auto',

     

       414
       -
         CancelToken? cancelToken,

     

       415
       -
       })

     

       416
       -
       ```

     

       417
       -
       

     

       418
       -
       **Parameters:**

     

       419
       -
       

     

       420
       -
       - `sub` - User's DID (e.g., `"did:plc:abc123"`)

     

       421
       -
       - `refresh` - Token refresh strategy:

     

       422
       -
         - `'auto'` (default) - Refresh only if expired

     

       423
       -
         - `true` - Force refresh even if not expired

     

       424
       -
         - `false` - Use cached tokens even if expired

     

       425
       -
       - `cancelToken` - Dio cancellation token (optional)

     

       426
       -
       

     

       427
       -
       **Returns:** `OAuthSession` - Restored session

     

       428
       -
       

     

       429
       -
       **Throws:**

     

       430
       -
       - `Exception` - Session not found

     

       431
       -
       - `TokenRefreshError` - Refresh failed

     

       432
       -
       - `AuthMethodUnsatisfiableError` - Auth method not supported

     

       433
       -
       

     

       434
       -
       **Example:**

     

       435
       -
       

     

       436
       -
       ```dart

     

       437
       -
       // Auto-refresh if expired

     

       438
       -
       final session = await client.restore('did:plc:abc123');

     

       439
       -
       

     

       440
       -
       // Force refresh

     

       441
       -
       final fresh = await client.restore('did:plc:abc123', refresh: true);

     

       442
       -
       ```

     

       443
       -
       

     

       444
       -
       ##### `revoke()`

     

       445
       -
       

     

       446
       -
       Revoke a session (sign out).

     

       447
       -
       

     

       448
       -
       ```dart

     

       449
       -
       Future<void> revoke(

     

       450
       -
         String sub, {

     

       451
       -
         CancelToken? cancelToken,

     

       452
       -
       })

     

       453
       -
       ```

     

       454
       -
       

     

       455
       -
       **Parameters:**

     

       456
       -
       

     

       457
       -
       - `sub` - User's DID

     

       458
       -
       - `cancelToken` - Dio cancellation token (optional)

     

       459
       -
       

     

       460
       -
       **Behavior:**

     

       461
       -
       - Calls server's token revocation endpoint (best-effort)

     

       462
       -
       - Deletes session from local storage (always)

     

       463
       -
       - Emits `deleted` event

     

       464
       -
       

     

       465
       -
       **Example:**

     

       466
       -
       

     

       467
       -
       ```dart

     

       468
       -
       await client.revoke('did:plc:abc123');

     

       469
       -
       ```

     

       470
       -
       

     

       471
       -
       #### Properties

     

       472
       -
       

     

       473
       -
       ##### `onUpdated`

     

       474
       -
       

     

       475
       -
       Stream of session update events (token refresh, etc.).

     

       476
       -
       

     

       477
       -
       ```dart

     

       478
       -
       Stream<SessionUpdatedEvent> get onUpdated

     

       479
       -
       ```

     

       480
       -
       

     

       481
       -
       **Example:**

     

       482
       -
       

     

       483
       -
       ```dart

     

       484
       -
       client.onUpdated.listen((event) {

     

       485
       -
         print('Session ${event.sub} updated');

     

       486
       -
       });

     

       487
       -
       ```

     

       488
       -
       

     

       489
       -
       ##### `onDeleted`

     

       490
       -
       

     

       491
       -
       Stream of session deletion events (revoke, expiry, errors).

     

       492
       -
       

     

       493
       -
       ```dart

     

       494
       -
       Stream<SessionDeletedEvent> get onDeleted

     

       495
       -
       ```

     

       496
       -
       

     

       497
       -
       **Example:**

     

       498
       -
       

     

       499
       -
       ```dart

     

       500
       -
       client.onDeleted.listen((event) {

     

       501
       -
         print('Session ${event.sub} deleted: ${event.cause}');

     

       502
       -
         // Navigate to sign-in screen

     

       503
       -
       });

     

       504
       -
       ```

     

       505
       -
       

     

       506
       -
       ---

     

       507
       -
       

     

       508
       -
       ### OAuthClient (Core)

     

       509
       -
       

     

       510
       -
       **For advanced use cases.** Provides lower-level control over the OAuth flow.

     

       511
       -
       

     

       512
       -
       #### Constructor

     

       513
       -
       

     

       514
       -
       ```dart

     

       515
       -
       OAuthClient(OAuthClientOptions options)

     

       516
       -
       ```

     

       517
       -
       

     

       518
       -
       See [OAuthClientOptions](#oauthclientoptions) for all parameters.

     

       519
       -
       

     

       520
       -
       #### Methods

     

       521
       -
       

     

       522
       -
       ##### `authorize()`

     

       523
       -
       

     

       524
       -
       Start OAuth authorization flow (returns URL to open in browser).

     

       525
       -
       

     

       526
       -
       ```dart

     

       527
       -
       Future<Uri> authorize(

     

       528
       -
         String input, {

     

       529
       -
         AuthorizeOptions? options,

     

       530
       -
         CancelToken? cancelToken,

     

       531
       -
       })

     

       532
       -
       ```

     

       533
       -
       

     

       534
       -
       **Parameters:** Same as `signIn()` but returns URL instead of completing flow.

     

       535
       -
       

     

       536
       -
       **Returns:** `Uri` - Authorization URL to open in browser

     

       537
       -
       

     

       538
       -
       **Throws:** Same as `signIn()`

     

       539
       -
       

     

       540
       -
       **Example:**

     

       541
       -
       

     

       542
       -
       ```dart

     

       543
       -
       final authUrl = await client.authorize('alice.bsky.social');

     

       544
       -
       // Open authUrl in browser yourself

     

       545
       -
       ```

     

       546
       -
       

     

       547
       -
       ##### `callback()`

     

       548
       -
       

     

       549
       -
       Handle OAuth callback after user authorization.

     

       550
       -
       

     

       551
       -
       ```dart

     

       552
       -
       Future<CallbackResult> callback(

     

       553
       -
         Map<String, String> params, {

     

       554
       -
         CallbackOptions? options,

     

       555
       -
         CancelToken? cancelToken,

     

       556
       -
       })

     

       557
       -
       ```

     

       558
       -
       

     

       559
       -
       **Parameters:**

     

       560
       -
       

     

       561
       -
       - `params` - Query/fragment parameters from callback URL

     

       562
       -
       - `options` - Callback options (see [CallbackOptions](#callbackoptions))

     

       563
       -
       - `cancelToken` - Dio cancellation token (optional)

     

       564
       -
       

     

       565
       -
       **Returns:** `CallbackResult` - Contains session and app state

     

       566
       -
       

     

       567
       -
       **Throws:**

     

       568
       -
       - `OAuthCallbackError` - OAuth error or invalid callback

     

       569
       -
       

     

       570
       -
       **Example:**

     

       571
       -
       

     

       572
       -
       ```dart

     

       573
       -
       // Extract params from callback URL

     

       574
       -
       final uri = Uri.parse(callbackUrl);

     

       575
       -
       final params = uri.queryParameters;

     

       576
       -
       

     

       577
       -
       // Complete OAuth flow

     

       578
       -
       final result = await client.callback(params);

     

       579
       -
       print('Signed in: ${result.session.sub}');

     

       580
       -
       print('App state: ${result.state}');

     

       581
       -
       ```

     

       582
       -
       

     

       583
       -
       ##### `restore()` and `revoke()`

     

       584
       -
       

     

       585
       -
       Same as `FlutterOAuthClient`.

     

       586
       -
       

     

       587
       -
       #### Static Methods

     

       588
       -
       

     

       589
       -
       ##### `fetchMetadata()`

     

       590
       -
       

     

       591
       -
       Fetch client metadata from a discoverable client ID URL.

     

       592
       -
       

     

       593
       -
       ```dart

     

       594
       -
       static Future<Map<String, dynamic>> fetchMetadata(

     

       595
       -
         OAuthClientFetchMetadataOptions options,

     

       596
       -
       )

     

       597
       -
       ```

     

       598
       -
       

     

       599
       -
       **Parameters:**

     

       600
       -
       

     

       601
       -
       - `options.clientId` - HTTPS URL to client metadata JSON

     

       602
       -
       - `options.dio` - Custom HTTP client (optional)

     

       603
       -
       - `options.cancelToken` - Cancellation token (optional)

     

       604
       -
       

     

       605
       -
       **Returns:** Client metadata as JSON

     

       606
       -
       

     

       607
       -
       **Example:**

     

       608
       -
       

     

       609
       -
       ```dart

     

       610
       -
       final metadata = await OAuthClient.fetchMetadata(

     

       611
       -
         OAuthClientFetchMetadataOptions(

     

       612
       -
           clientId: 'https://example.com/client-metadata.json',

     

       613
       -
         ),

     

       614
       -
       );

     

       615
       -
       ```

     

       616
       -
       

     

       617
       -
       #### Properties

     

       618
       -
       

     

       619
       -
       Same as `FlutterOAuthClient` (`onUpdated`, `onDeleted`).

     

       620
       -
       

     

       621
       -
       ---

     

       622
       -
       

     

       623
       -
       ### Types

     

       624
       -
       

     

       625
       -
       #### ClientMetadata

     

       626
       -
       

     

       627
       -
       OAuth client configuration.

     

       628
       -
       

     

       629
       -
       ```dart

     

       630
       -
       class ClientMetadata {

     

       631
       -
         final String? clientId;

     

       632
       -
         final List<String> redirectUris;

     

       633
       -
         final List<String> responseTypes;

     

       634
       -
         final List<String> grantTypes;

     

       635
       -
         final String? scope;

     

       636
       -
         final String tokenEndpointAuthMethod;

     

       637
       -
         final String? tokenEndpointAuthSigningAlg;

     

       638
       -
         final String? jwksUri;

     

       639
       -
         final Map<String, dynamic>? jwks;

     

       640
       -
         final String applicationType;

     

       641
       -
         final String subjectType;

     

       642
       -
         final String authorizationSignedResponseAlg;

     

       643
       -
         final String? clientName;

     

       644
       -
         final String? clientUri;

     

       645
       -
         final String? policyUri;

     

       646
       -
         final String? tosUri;

     

       647
       -
         final String? logoUri;

     

       648
       -
         final int? defaultMaxAge;

     

       649
       -
         final bool? requireAuthTime;

     

       650
       -
         final List<String>? contacts;

     

       651
       -
         final bool? dpopBoundAccessTokens;

     

       652
       -
         final List<String>? authorizationDetailsTypes;

     

       653
       -
       

     

       654
       -
         // ... more fields

     

       655
       -
       }

     

       656
       -
       ```

     

       657
       -
       

     

       658
       -
       **Key Fields:**

     

       659
       -
       

     

       660
       -
       - `clientId` - Client identifier:

     

       661
       -
         - Discoverable: HTTPS URL to client metadata JSON (production)

     

       662
       -
         - Loopback: `http://localhost` (development only)

     

       663
       -
       - `redirectUris` - Array of valid redirect URIs (must match deep link configuration)

     

       664
       -
       - `scope` - Requested scope (default: `"atproto"`, recommended: `"atproto transition:generic"`)

     

       665
       -
       - `clientName` - Human-readable app name

     

       666
       -
       - `dpopBoundAccessTokens` - Enable DPoP (recommended: `true`)

     

       667
       -
       

     

       668
       -
       **Example:**

     

       669
       -
       

     

       670
       -
       ```dart

     

       671
       -
       // Development (loopback client)

     

       672
       -
       final metadata = ClientMetadata(

     

       673
       -
         clientId: 'http://localhost',

     

       674
       -
         redirectUris: ['myapp://oauth/callback'],

     

       675
       -
         scope: 'atproto transition:generic',

     

       676
       -
       );

     

       677
       -
       

     

       678
       -
       // Production (discoverable client)

     

       679
       -
       final metadata = ClientMetadata(

     

       680
       -
         clientId: 'https://example.com/client-metadata.json',

     

       681
       -
         redirectUris: [

     

       682
       -
           'myapp://oauth/callback',           // Custom scheme

     

       683
       -
           'https://example.com/oauth/callback' // Universal link

     

       684
       -
         ],

     

       685
       -
         scope: 'atproto transition:generic',

     

       686
       -
         clientName: 'My Awesome App',

     

       687
       -
         clientUri: 'https://example.com',

     

       688
       -
         dpopBoundAccessTokens: true,

     

       689
       -
       );

     

       690
       -
       ```

     

       691
       -
       

     

       692
       -
       #### AuthorizeOptions

     

       693
       -
       

     

       694
       -
       Additional parameters for `authorize()` / `signIn()`.

     

       695
       -
       

     

       696
       -
       ```dart

     

       697
       -
       class AuthorizeOptions {

     

       698
       -
         final String? redirectUri;

     

       699
       -
         final String? state;

     

       700
       -
         final String? scope;

     

       701
       -
         final String? nonce;

     

       702
       -
         final String? display;

     

       703
       -
         final String? prompt;

     

       704
       -
         final int? maxAge;

     

       705
       -
         final Map<String, dynamic>? claims;

     

       706
       -
         final String? uiLocales;

     

       707
       -
         final String? idTokenHint;

     

       708
       -
         final Map<String, dynamic>? authorizationDetails;

     

       709
       -
       }

     

       710
       -
       ```

     

       711
       -
       

     

       712
       -
       **Key Fields:**

     

       713
       -
       

     

       714
       -
       - `redirectUri` - Override default redirect URI

     

       715
       -
       - `state` - Application state to preserve (returned in callback)

     

       716
       -
       - `scope` - Override default scope

     

       717
       -
       - `display` - Display mode: `"touch"` (default for mobile), `"page"`, `"popup"`

     

       718
       -
       - `prompt` - Prompt user: `"none"`, `"login"`, `"consent"`, `"select_account"`

     

       719
       -
       

     

       720
       -
       **Example:**

     

       721
       -
       

     

       722
       -
       ```dart

     

       723
       -
       final session = await client.signIn(

     

       724
       -
         'alice.bsky.social',

     

       725
       -
         options: AuthorizeOptions(

     

       726
       -
           state: jsonEncode({'returnTo': '/home'}),

     

       727
       -
           prompt: 'login',  // Force re-authentication

     

       728
       -
         ),

     

       729
       -
       );

     

       730
       -
       ```

     

       731
       -
       

     

       732
       -
       #### CallbackOptions

     

       733
       -
       

     

       734
       -
       Options for `callback()`.

     

       735
       -
       

     

       736
       -
       ```dart

     

       737
       -
       class CallbackOptions {

     

       738
       -
         final String? redirectUri;

     

       739
       -
       }

     

       740
       -
       ```

     

       741
       -
       

     

       742
       -
       **Note:** `redirectUri` must match the one used in `authorize()`.

     

       743
       -
       

     

       744
       -
       #### OAuthSession

     

       745
       -
       

     

       746
       -
       Authenticated session with token management.

     

       747
       -
       

     

       748
       -
       ```dart

     

       749
       -
       class OAuthSession {

     

       750
       -
         final OAuthServerAgent server;

     

       751
       -
         final String sub;  // User's DID

     

       752
       -
       

     

       753
       -
         // Properties

     

       754
       -
         String get did => sub;

     

       755
       -
         Map<String, dynamic> get serverMetadata;

     

       756
       -
       

     

       757
       -
         // Methods

     

       758
       -
         Future<TokenInfo> getTokenInfo([dynamic refresh = 'auto']);

     

       759
       -
         Future<void> signOut();

     

       760
       -
         Future<http.Response> fetchHandler(

     

       761
       -
           String pathname, {

     

       762
       -
           String method = 'GET',

     

       763
       -
           Map<String, String>? headers,

     

       764
       -
           dynamic body,

     

       765
       -
         });

     

       766
       -
       }

     

       767
       -
       ```

     

       768
       -
       

     

       769
       -
       **Key Methods:**

     

       770
       -
       

     

       771
       -
       - `getTokenInfo()` - Get current token info (automatically refreshes if expired)

     

       772
       -
       - `signOut()` - Revoke tokens and delete session

     

       773
       -
       - `fetchHandler()` - Make authenticated HTTP request (with auto-refresh and DPoP)

     

       774
       -
       

     

       775
       -
       **Example:**

     

       776
       -
       

     

       777
       -
       ```dart

     

       778
       -
       final session = await client.signIn('alice.bsky.social');

     

       779
       -
       

     

       780
       -
       // Get token info

     

       781
       -
       final info = await session.getTokenInfo();

     

       782
       -
       print('Expires: ${info.expiresAt}');

     

       783
       -
       print('Scope: ${info.scope}');

     

       784
       -
       

     

       785
       -
       // Make authenticated request

     

       786
       -
       final response = await session.fetchHandler(

     

       787
       -
         '/xrpc/com.atproto.repo.getRecord',

     

       788
       -
         method: 'GET',

     

       789
       -
       );

     

       790
       -
       ```

     

       791
       -
       

     

       792
       -
       #### TokenInfo

     

       793
       -
       

     

       794
       -
       Information about the current access token.

     

       795
       -
       

     

       796
       -
       ```dart

     

       797
       -
       class TokenInfo {

     

       798
       -
         final DateTime? expiresAt;

     

       799
       -
         final bool? expired;

     

       800
       -
         final String scope;

     

       801
       -
         final String iss;  // Issuer URL

     

       802
       -
         final String aud;  // Audience (PDS URL)

     

       803
       -
         final String sub;  // User's DID

     

       804
       -
       }

     

       805
       -
       ```

     

       806
       -
       

     

       807
       -
       ---

     

       808
       -
       

     

       809
       -
       ### Errors

     

       810
       -
       

     

       811
       -
       All errors extend `Exception` and can be caught with standard try-catch.

     

       812
       -
       

     

       813
       -
       #### OAuthCallbackError

     

       814
       -
       

     

       815
       -
       OAuth error from server or invalid callback.

     

       816
       -
       

     

       817
       -
       ```dart

     

       818
       -
       class OAuthCallbackError implements Exception {

     

       819
       -
         final String? error;              // OAuth error code

     

       820
       -
         final String? errorDescription;   // Human-readable description

     

       821
       -
         final String? errorUri;            // URL with more info

     

       822
       -
         final String? state;               // App state from authorize

     

       823
       -
         final Map<String, String> params;  // All callback parameters

     

       824
       -
       }

     

       825
       -
       ```

     

       826
       -
       

     

       827
       -
       **Common error codes:**

     

       828
       -
       - `access_denied` - User denied authorization

     

       829
       -
       - `invalid_request` - Invalid parameters

     

       830
       -
       - `server_error` - Server error

     

       831
       -
       

     

       832
       -
       **Example:**

     

       833
       -
       

     

       834
       -
       ```dart

     

       835
       -
       try {

     

       836
       -
         final session = await client.signIn('alice.bsky.social');

     

       837
       -
       } on OAuthCallbackError catch (e) {

     

       838
       -
         if (e.error == 'access_denied') {

     

       839
       -
           print('User cancelled sign-in');

     

       840
       -
         } else {

     

       841
       -
           print('OAuth error: ${e.error} - ${e.errorDescription}');

     

       842
       -
         }

     

       843
       -
       }

     

       844
       -
       ```

     

       845
       -
       

     

       846
       -
       #### OAuthResolverError

     

       847
       -
       

     

       848
       -
       Failed to resolve identity or discover OAuth server.

     

       849
       -
       

     

       850
       -
       **When thrown:**

     

       851
       -
       - Handle doesn't resolve

     

       852
       -
       - DID document not found

     

       853
       -
       - PDS URL missing from DID document

     

       854
       -
       - OAuth server metadata not found

     

       855
       -
       

     

       856
       -
       #### TokenRefreshError

     

       857
       -
       

     

       858
       -
       Failed to refresh access token.

     

       859
       -
       

     

       860
       -
       **When thrown:**

     

       861
       -
       - Refresh token expired

     

       862
       -
       - Refresh token revoked

     

       863
       -
       - Network error

     

       864
       -
       - Server error

     

       865
       -
       

     

       866
       -
       #### TokenRevokedError

     

       867
       -
       

     

       868
       -
       Token was revoked (intentional sign-out).

     

       869
       -
       

     

       870
       -
       #### TokenInvalidError

     

       871
       -
       

     

       872
       -
       Token is invalid (rejected by resource server).

     

       873
       -
       

     

       874
       -
       #### AuthMethodUnsatisfiableError

     

       875
       -
       

     

       876
       -
       Client authentication method not supported.

     

       877
       -
       

     

       878
       -
       ---

     

       879
       -
       

     

       880
       -
       ## Usage Guide

     

       881
       -
       

     

       882
       -
       ### Sign In Flow

     

       883
       -
       

     

       884
       -
       Complete example with error handling:

     

       885
       -
       

     

       886
       -
       ```dart

     

       887
       -
       import 'package:atproto_oauth_flutter/atproto_oauth_flutter.dart';

     

       888
       -
       

     

       889
       -
       Future<void> signIn(String handle) async {

     

       890
       -
         final client = FlutterOAuthClient(

     

       891
       -
           clientMetadata: ClientMetadata(

     

       892
       -
             clientId: 'http://localhost',

     

       893
       -
             redirectUris: ['myapp://oauth/callback'],

     

       894
       -
             scope: 'atproto transition:generic',

     

       895
       -
           ),

     

       896
       -
         );

     

       897
       -
       

     

       898
       -
         try {

     

       899
       -
           final session = await client.signIn(handle);

     

       900
       -
       

     

       901
       -
           print('✓ Signed in successfully!');

     

       902
       -
           print('  DID: ${session.sub}');

     

       903
       -
       

     

       904
       -
           final info = await session.getTokenInfo();

     

       905
       -
           print('  Expires: ${info.expiresAt}');

     

       906
       -
       

     

       907
       -
         } on OAuthCallbackError catch (e) {

     

       908
       -
           if (e.error == 'access_denied') {

     

       909
       -
             print('User denied authorization');

     

       910
       -
           } else {

     

       911
       -
             print('OAuth error: ${e.error}');

     

       912
       -
           }

     

       913
       -
         } catch (e) {

     

       914
       -
           print('Unexpected error: $e');

     

       915
       -
         }

     

       916
       -
       }

     

       917
       -
       ```

     

       918
       -
       

     

       919
       -
       ### Session Restoration

     

       920
       -
       

     

       921
       -
       Restore session when app restarts:

     

       922
       -
       

     

       923
       -
       ```dart

     

       924
       -
       Future<OAuthSession?> restoreSession(FlutterOAuthClient client) async {

     

       925
       -
         final did = await loadSavedDid();

     

       926
       -
         if (did == null) return null;

     

       927
       -
       

     

       928
       -
         try {

     

       929
       -
           final session = await client.restore(did);

     

       930
       -
           print('✓ Session restored for ${session.sub}');

     

       931
       -
           return session;

     

       932
       -
       

     

       933
       -
         } on TokenRefreshError catch (e) {

     

       934
       -
           print('❌ Session refresh failed: ${e.message}');

     

       935
       -
           await clearSavedDid();

     

       936
       -
           return null;

     

       937
       -
         }

     

       938
       -
       }

     

       939
       -
       ```

     

       940
       -
       

     

       941
       -
       ### Token Refresh

     

       942
       -
       

     

       943
       -
       Tokens are refreshed **automatically**:

     

       944
       -
       

     

       945
       -
       ```dart

     

       946
       -
       // Auto-refresh (default)

     

       947
       -
       final session = await client.restore(did);

     

       948
       -
       

     

       949
       -
       // Force refresh

     

       950
       -
       final fresh = await client.restore(did, refresh: true);

     

       951
       -
       

     

       952
       -
       // Check token status

     

       953
       -
       final info = await session.getTokenInfo();

     

       954
       -
       if (info.expired == true) {

     

       955
       -
         print('Token will refresh on next API call');

     

       956
       -
       }

     

       957
       -
       ```

     

       958
       -
       

     

       959
       -
       ### Sign Out (Revoke)

     

       960
       -
       

     

       961
       -
       ```dart

     

       962
       -
       Future<void> signOut(FlutterOAuthClient client, String did) async {

     

       963
       -
         try {

     

       964
       -
           await client.revoke(did);

     

       965
       -
           print('✓ Signed out successfully');

     

       966
       -
           await clearSavedDid();

     

       967
       -
         } catch (e) {

     

       968
       -
           print('⚠ Revoke failed: $e');

     

       969
       -
           await clearSavedDid();

     

       970
       -
         }

     

       971
       -
       }

     

       972
       -
       ```

     

       973
       -
       

     

       974
       -
       ### Session Events

     

       975
       -
       

     

       976
       -
       ```dart

     

       977
       -
       void setupSessionListeners(FlutterOAuthClient client) {

     

       978
       -
         client.onUpdated.listen((event) {

     

       979
       -
           print('Session updated: ${event.sub}');

     

       980
       -
         });

     

       981
       -
       

     

       982
       -
         client.onDeleted.listen((event) {

     

       983
       -
           print('Session deleted: ${event.sub}');

     

       984
       -
           navigateToSignIn();

     

       985
       -
         });

     

       986
       -
       }

     

       987
       -
       ```

     

       988
       -
       

     

       989
       -
       ---

     

       990
       -
       

     

       991
       -
       ## Advanced Usage

     

       992
       -
       

     

       993
       -
       ### Custom Storage Configuration

     

       994
       -
       

     

       995
       -
       ```dart

     

       996
       -
       final client = FlutterOAuthClient(

     

       997
       -
         clientMetadata: metadata,

     

       998
       -
         secureStorage: FlutterSecureStorage(

     

       999
       -
           iOptions: IOSOptions(

     

       1000
       -
             accessibility: KeychainAccessibility.first_unlock,

     

       1001
       -
           ),

     

       1002
       -
           aOptions: AndroidOptions(

     

       1003
       -
             encryptedSharedPreferences: true,

     

       1004
       -
           ),

     

       1005
       -
         ),

     

       1006
       -
       );

     

       1007
       -
       ```

     

       1008
       -
       

     

       1009
       -
       ### Direct OAuthClient Usage

     

       1010
       -
       

     

       1011
       -
       For full control over the OAuth flow:

     

       1012
       -
       

     

       1013
       -
       ```dart

     

       1014
       -
       final client = OAuthClient(

     

       1015
       -
         OAuthClientOptions(

     

       1016
       -
           responseMode: OAuthResponseMode.query,

     

       1017
       -
           clientMetadata: metadata.toJson(),

     

       1018
       -
           stateStore: MyCustomStateStore(),

     

       1019
       -
           sessionStore: MyCustomSessionStore(),

     

       1020
       -
           runtimeImplementation: FlutterRuntime(),

     

       1021
       -
         ),

     

       1022
       -
       );

     

       1023
       -
       

     

       1024
       -
       // Manual flow

     

       1025
       -
       final authUrl = await client.authorize('alice.bsky.social');

     

       1026
       -
       // Open browser yourself

     

       1027
       -
       final result = await client.callback(params);

     

       1028
       -
       ```

     

       1029
       -
       

     

       1030
       -
       ---

     

       1031
       -
       

     

       1032
       -
       ## Decentralization Explained

     

       1033
       -
       

     

       1034
       -
       This is the **critical feature** that sets this package apart.

     

       1035
       -
       

     

       1036
       -
       ### The Problem: Hardcoded Servers

     

       1037
       -
       

     

       1038
       -
       ```dart

     

       1039
       -
       // ❌ BROKEN - Only works with bsky.social

     

       1040
       -
       const authServer = 'https://bsky.social';  // Hardcoded!

     

       1041
       -
       ```

     

       1042
       -
       

     

       1043
       -
       ### The Solution: Dynamic Discovery

     

       1044
       -
       

     

       1045
       -
       ```dart

     

       1046
       -
       // ✅ CORRECT - Discovers auth server dynamically

     

       1047
       -
       await client.signIn('bob.custom-pds.com');

     

       1048
       -
       

     

       1049
       -
       // What happens:

     

       1050
       -
       // 1. Resolve handle → DID

     

       1051
       -
       // 2. Fetch DID document

     

       1052
       -
       // 3. Discover PDS URL

     

       1053
       -
       // 4. Fetch PDS metadata

     

       1054
       -
       // 5. Discover authorization server

     

       1055
       -
       // 6. Complete OAuth with correct server ✅

     

       1056
       -
       ```

     

       1057
       -
       

     

       1058
       -
       ### Why This Matters

     

       1059
       -
       

     

       1060
       -
       **atProto is decentralized.** Users can host their data on any PDS. Your app should work with ALL of them.

     

       1061
       -
       

     

       1062
       -
       ### Real-World Example

     

       1063
       -
       

     

       1064
       -
       ```dart

     

       1065
       -
       // Alice uses Bluesky

     

       1066
       -
       await client.signIn('alice.bsky.social');

     

       1067
       -
       // → https://bsky.app

     

       1068
       -
       

     

       1069
       -
       // Bob runs his own

     

       1070
       -
       await client.signIn('bob.example.com');

     

       1071
       -
       // → https://auth.example.com

     

       1072
       -
       

     

       1073
       -
       // All work! 🎉

     

       1074
       -
       ```

     

       1075
       -
       

     

       1076
       -
       ---

     

       1077
       -
       

     

       1078
       -
       ## Security Features

     

       1079
       -
       

     

       1080
       -
       ### Secure Token Storage

     

       1081
       -
       

     

       1082
       -
       - **iOS:** Keychain with device encryption

     

       1083
       -
       - **Android:** EncryptedSharedPreferences (AES-256)

     

       1084
       -
       

     

       1085
       -
       ### DPoP (Token Binding)

     

       1086
       -
       

     

       1087
       -
       - Binds tokens to cryptographic keys

     

       1088
       -
       - Prevents token theft

     

       1089
       -
       - Every request includes signed proof

     

       1090
       -
       

     

       1091
       -
       ### PKCE (Code Protection)

     

       1092
       -
       

     

       1093
       -
       - SHA-256 challenge/verifier

     

       1094
       -
       - Prevents code interception

     

       1095
       -
       

     

       1096
       -
       ### State Parameter

     

       1097
       -
       

     

       1098
       -
       - CSRF protection

     

       1099
       -
       - One-time use

     

       1100
       -
       

     

       1101
       -
       ---

     

       1102
       -
       

     

       1103
       -
       ## OAuth Flows

     

       1104
       -
       

     

       1105
       -
       ### Authorization Flow

     

       1106
       -
       

     

       1107
       -
       ```

     

       1108
       -
       App → Resolve identity → Discover servers → Generate PKCE/DPoP

     

       1109
       -
         → Open browser → User authenticates → Callback → Exchange code

     

       1110
       -
         → Store session → Return OAuthSession

     

       1111
       -
       ```

     

       1112
       -
       

     

       1113
       -
       ### Token Refresh Flow

     

       1114
       -
       

     

       1115
       -
       ```

     

       1116
       -
       API call → Detect expiration → Acquire lock → Refresh tokens

     

       1117
       -
         → Update storage → Release lock → Retry API call

     

       1118
       -
       ```

     

       1119
       -
       

     

       1120
       -
       ---

     

       1121
       -
       

     

       1122
       -
       ## Troubleshooting

     

       1123
       -
       

     

       1124
       -
       ### Deep Linking Not Working

     

       1125
       -
       

     

       1126
       -
       1. Check platform configuration (Info.plist / AndroidManifest.xml)

     

       1127
       -
       2. Test manually: `xcrun simctl openurl booted "myapp://..."`

     

       1128
       -
       3. Verify URL scheme matches `redirectUris`

     

       1129
       -
       

     

       1130
       -
       ### OAuth Errors

     

       1131
       -
       

     

       1132
       -
       - `invalid_request` - Check ClientMetadata

     

       1133
       -
       - `access_denied` - User cancelled

     

       1134
       -
       - `server_error` - Check server status

     

       1135
       -
       

     

       1136
       -
       ### Token Refresh Failures

     

       1137
       -
       

     

       1138
       -
       - Token expired → User must re-authenticate

     

       1139
       -
       - Session auto-deleted on failure

     

       1140
       -
       

     

       1141
       -
       ---

     

       1142
       -
       

     

       1143
       -
       ## Migration Guide

     

       1144
       -
       

     

       1145
       -
       ### From `atproto_oauth`

     

       1146
       -
       

     

       1147
       -
       **Before (Broken):**

     

       1148
       -
       ```dart

     

       1149
       -
       // Only works with bsky.social

     

       1150
       -
       final session = await client.signIn('bob.custom-pds.com');  // BROKEN

     

       1151
       -
       ```

     

       1152
       -
       

     

       1153
       -
       **After (Fixed):**

     

       1154
       -
       ```dart

     

       1155
       -
       import 'package:atproto_oauth_flutter/atproto_oauth_flutter.dart';

     

       1156
       -
       

     

       1157
       -
       final client = FlutterOAuthClient(

     

       1158
       -
         clientMetadata: ClientMetadata(

     

       1159
       -
           clientId: 'http://localhost',

     

       1160
       -
           redirectUris: ['myapp://oauth/callback'],

     

       1161
       -
         ),

     

       1162
       -
       );

     

       1163
       -
       

     

       1164
       -
       final session = await client.signIn('bob.custom-pds.com');  // WORKS!

     

       1165
       -
       ```

     

       1166
       -
       

     

       1167
       -
       ---

     

       1168
       -
       

     

       1169
       -
       ## Architecture

     

       1170
       -
       

     

       1171
       -
       Built in **7 layers** matching TypeScript original:

     

       1172
       -
       

     

       1173
       -
       1. **Foundation** - Types, constants, utilities

     

       1174
       -
       2. **Runtime** - Crypto abstractions, PKCE, keys

     

       1175
       -
       3. **Identity Resolution** - DID/handle → PDS discovery (**critical for decentralization**)

     

       1176
       -
       4. **OAuth Discovery** - Dynamic server metadata fetching

     

       1177
       -
       5. **DPoP** - Token binding proofs

     

       1178
       -
       6. **OAuth Flow** - Authorization, tokens, sessions

     

       1179
       -
       7. **Flutter Platform** - Secure storage, crypto implementation

     

       1180
       -
       

     

       1181
       -
       ---

     

       1182
       -
       

     

       1183
       -
       ## Examples

     

       1184
       -
       

     

       1185
       -
       See `example/flutter_oauth_example.dart` for complete examples.

     

       1186
       -
       

     

       1187
       -
       ### Minimal Example

     

       1188
       -
       

     

       1189
       -
       ```dart

     

       1190
       -
       final client = FlutterOAuthClient(

     

       1191
       -
         clientMetadata: ClientMetadata(

     

       1192
       -
           clientId: 'http://localhost',

     

       1193
       -
           redirectUris: ['myapp://oauth/callback'],

     

       1194
       -
         ),

     

       1195
       -
       );

     

       1196
       -
       

     

       1197
       -
       final session = await client.signIn('alice.bsky.social');

     

       1198
       -
       print('Signed in: ${session.sub}');

     

       1199
       -
       ```

     

       1200
       -
       

     

       1201
       -
       ---

     

       1202
       -
       

     

       1203
       -
       ## Contributing

     

       1204
       -
       

     

       1205
       -
       Contributions welcome! Please:

     

       1206
       -
       1. Fork the repo

     

       1207
       -
       2. Create feature branch

     

       1208
       -
       3. Run `flutter analyze`

     

       1209
       -
       4. Submit PR

     

       1210
       -
       

     

       1211
       -
       ---

     

       1212
       -
       

     

       1213
       -
       ## License

     

       1214
       -
       

     

       1215
       -
       MIT License - See LICENSE file

     

       1216
       -
       

     

       1217
       -
       ---

     

       1218
       -
       

     

       1219
       -
       ## Credits

     

       1220
       -
       

     

       1221
       -
       - **Based on:** Official Bluesky [`@atproto/oauth-client`](https://github.com/bluesky-social/atproto/tree/main/packages/oauth/oauth-client)

     

       1222
       -
       - **Architecture:** 1:1 port maintaining API compatibility

     

       1223
       -
       

     

       1224
       -
       ---

     

       1225
       -
       

     

       1226
       -
       ## Status

     

       1227
       -
       

     

       1228
       -
       **Version:** 0.1.0

     

       1229
       -
       **Status:** ✅ Complete - Ready for Testing

     

       1230
       -
       

     

       1231
       -
       **Next:**

     

       1232
       -
       - Manual testing with real servers

     

       1233
       -
       - Unit/integration tests

     

       1234
       -
       - Publish to pub.dev

     

       1235
       -
       

     

       1236
       -
       ---

     

       1237
       -
       

     

       1238
       -
       **Made with ❤️ for the decentralized web**

-220

packages/atproto_oauth_flutter/example/flutter_oauth_example.dart

···

       1
       -
       /// Example usage of FlutterOAuthClient for atProto OAuth authentication.

     

       2
       -
       ///

     

       3
       -
       /// This demonstrates the complete OAuth flow for a Flutter application:

     

       4
       -
       /// 1. Initialize the client

     

       5
       -
       /// 2. Sign in with a handle

     

       6
       -
       /// 3. Use the authenticated session

     

       7
       -
       /// 4. Restore session on app restart

     

       8
       -
       /// 5. Sign out (revoke session)

     

       9
       -
       

     

       10
       -
       import 'package:atproto_oauth_flutter/atproto_oauth_flutter.dart';

     

       11
       -
       

     

       12
       -
       void main() async {

     

       13
       -
         // ========================================================================

     

       14
       -
         // 1. Initialize the OAuth client

     

       15
       -
         // ========================================================================

     

       16
       -
       

     

       17
       -
         final client = FlutterOAuthClient(

     

       18
       -
           clientMetadata: ClientMetadata(

     

       19
       -
             // For development: use loopback client (no client metadata URL needed)

     

       20
       -
             clientId: 'http://localhost',

     

       21
       -
       

     

       22
       -
             // For production: use discoverable client metadata

     

       23
       -
             // clientId: 'https://example.com/client-metadata.json',

     

       24
       -
       

     

       25
       -
             // Redirect URIs for your app

     

       26
       -
             // - Custom URL scheme: myapp://oauth/callback

     

       27
       -
             // - Universal links: https://example.com/oauth/callback

     

       28
       -
             redirectUris: ['myapp://oauth/callback'],

     

       29
       -
       

     

       30
       -
             // Scope: what permissions to request

     

       31
       -
             // - 'atproto': Full atproto access

     

       32
       -
             // - 'transition:generic': Additional permissions for legacy systems

     

       33
       -
             scope: 'atproto transition:generic',

     

       34
       -
       

     

       35
       -
             // Client metadata

     

       36
       -
             clientName: 'My Awesome App',

     

       37
       -
             clientUri: 'https://example.com',

     

       38
       -
       

     

       39
       -
             // Token binding

     

       40
       -
             dpopBoundAccessTokens: true, // Enable DPoP for security

     

       41
       -
           ),

     

       42
       -
       

     

       43
       -
           // Response mode (query or fragment)

     

       44
       -
           responseMode: OAuthResponseMode.query,

     

       45
       -
       

     

       46
       -
           // Allow HTTP only for development (never in production!)

     

       47
       -
           allowHttp: false,

     

       48
       -
         );

     

       49
       -
       

     

       50
       -
         // ========================================================================

     

       51
       -
         // 2. Sign in with a handle

     

       52
       -
         // ========================================================================

     

       53
       -
       

     

       54
       -
         try {

     

       55
       -
           print('Starting sign-in flow for alice.bsky.social...');

     

       56
       -
       

     

       57
       -
           // This will:

     

       58
       -
           // 1. Resolve the handle to find the authorization server

     

       59
       -
           // 2. Generate PKCE code challenge/verifier

     

       60
       -
           // 3. Generate DPoP key

     

       61
       -
           // 4. Open browser for user authentication

     

       62
       -
           // 5. Handle OAuth callback

     

       63
       -
           // 6. Exchange authorization code for tokens

     

       64
       -
           // 7. Store session securely

     

       65
       -
           final session = await client.signIn('alice.bsky.social');

     

       66
       -
       

     

       67
       -
           print('✓ Signed in successfully!');

     

       68
       -
           print('  DID: ${session.sub}');

     

       69
       -
           print('  Session info: ${session.info}');

     

       70
       -
       

     

       71
       -
           // ========================================================================

     

       72
       -
           // 3. Use the authenticated session

     

       73
       -
           // ========================================================================

     

       74
       -
       

     

       75
       -
           // The session has a PDS client you can use for authenticated requests

     

       76
       -
           // (This requires integrating with an atproto API client library)

     

       77
       -
           //

     

       78
       -
           // Example:

     

       79
       -
           // final agent = session.pdsClient;

     

       80
       -
           // final profile = await agent.getProfile();

     

       81
       -
       

     

       82
       -
           print('Session is ready for API calls');

     

       83
       -
         } on OAuthCallbackError catch (e) {

     

       84
       -
           // Handle OAuth errors (user cancelled, invalid state, etc.)

     

       85
       -
           print('OAuth callback error: ${e.error}');

     

       86
       -
           print('Description: ${e.errorDescription}');

     

       87
       -
           return;

     

       88
       -
         } catch (e) {

     

       89
       -
           print('Sign-in error: $e');

     

       90
       -
           return;

     

       91
       -
         }

     

       92
       -
       

     

       93
       -
         // ========================================================================

     

       94
       -
         // 4. Restore session on app restart

     

       95
       -
         // ========================================================================

     

       96
       -
       

     

       97
       -
         // Later, when the app restarts, restore the session:

     

       98
       -
         try {

     

       99
       -
           final did = 'did:plc:abc123'; // Get from storage or previous session

     

       100
       -
       

     

       101
       -
           print('Restoring session for $did...');

     

       102
       -
       

     

       103
       -
           // This will:

     

       104
       -
           // 1. Load session from secure storage

     

       105
       -
           // 2. Check if tokens are expired

     

       106
       -
           // 3. Automatically refresh if needed

     

       107
       -
           // 4. Return authenticated session

     

       108
       -
           final session = await client.restore(did);

     

       109
       -
       

     

       110
       -
           print('✓ Session restored!');

     

       111
       -
           print('  Access token expires: ${session.info['expiresAt']}');

     

       112
       -
         } catch (e) {

     

       113
       -
           print('Failed to restore session: $e');

     

       114
       -
           // Session may have been revoked or expired

     

       115
       -
           // Prompt user to sign in again

     

       116
       -
         }

     

       117
       -
       

     

       118
       -
         // ========================================================================

     

       119
       -
         // 5. Sign out (revoke session)

     

       120
       -
         // ========================================================================

     

       121
       -
       

     

       122
       -
         try {

     

       123
       -
           final did = 'did:plc:abc123';

     

       124
       -
       

     

       125
       -
           print('Signing out $did...');

     

       126
       -
       

     

       127
       -
           // This will:

     

       128
       -
           // 1. Call token revocation endpoint (best effort)

     

       129
       -
           // 2. Delete session from secure storage

     

       130
       -
           // 3. Emit 'deleted' event

     

       131
       -
           await client.revoke(did);

     

       132
       -
       

     

       133
       -
           print('✓ Signed out successfully');

     

       134
       -
         } catch (e) {

     

       135
       -
           print('Sign out error: $e');

     

       136
       -
           // Session is still deleted locally even if revocation fails

     

       137
       -
         }

     

       138
       -
       

     

       139
       -
         // ========================================================================

     

       140
       -
         // Advanced: Listen to session events

     

       141
       -
         // ========================================================================

     

       142
       -
       

     

       143
       -
         // Listen for session updates (token refresh, etc.)

     

       144
       -
         client.onUpdated.listen((event) {

     

       145
       -
           print('Session updated: ${event.sub}');

     

       146
       -
           print('  New access token received');

     

       147
       -
         });

     

       148
       -
       

     

       149
       -
         // Listen for session deletions (revoked, expired, etc.)

     

       150
       -
         client.onDeleted.listen((event) {

     

       151
       -
           print('Session deleted: ${event.sub}');

     

       152
       -
           print('  Cause: ${event.cause}');

     

       153
       -
           // Handle session deletion (navigate to sign-in screen, etc.)

     

       154
       -
         });

     

       155
       -
       

     

       156
       -
         // ========================================================================

     

       157
       -
         // Advanced: Custom configuration

     

       158
       -
         // ========================================================================

     

       159
       -
       

     

       160
       -
         // You can customize storage, caching, and crypto:

     

       161
       -
         final customClient = FlutterOAuthClient(

     

       162
       -
           clientMetadata: ClientMetadata(

     

       163
       -
             clientId: 'https://example.com/client-metadata.json',

     

       164
       -
             redirectUris: ['myapp://oauth/callback'],

     

       165
       -
           ),

     

       166
       -
       

     

       167
       -
           // Custom secure storage instance

     

       168
       -
           secureStorage: const FlutterSecureStorage(

     

       169
       -
             aOptions: AndroidOptions(encryptedSharedPreferences: true),

     

       170
       -
           ),

     

       171
       -
       

     

       172
       -
           // Custom PLC directory URL (for private deployments)

     

       173
       -
           plcDirectoryUrl: 'https://plc.example.com',

     

       174
       -
       

     

       175
       -
           // Custom handle resolver URL

     

       176
       -
           handleResolverUrl: 'https://bsky.social',

     

       177
       -
         );

     

       178
       -
       

     

       179
       -
         print('Custom client initialized');

     

       180
       -
       

     

       181
       -
         // ========================================================================

     

       182
       -
         // Platform configuration (iOS)

     

       183
       -
         // ========================================================================

     

       184
       -
       

     

       185
       -
         // iOS: Add URL scheme to Info.plist

     

       186
       -
         // <key>CFBundleURLTypes</key>

     

       187
       -
         // <array>

     

       188
       -
         //   <dict>

     

       189
       -
         //     <key>CFBundleURLSchemes</key>

     

       190
       -
         //     <array>

     

       191
       -
         //       <string>myapp</string>

     

       192
       -
         //     </array>

     

       193
       -
         //   </dict>

     

       194
       -
         // </array>

     

       195
       -
       

     

       196
       -
         // ========================================================================

     

       197
       -
         // Platform configuration (Android)

     

       198
       -
         // ========================================================================

     

       199
       -
       

     

       200
       -
         // Android: Add intent filter to AndroidManifest.xml

     

       201
       -
         // <intent-filter>

     

       202
       -
         //   <action android:name="android.intent.action.VIEW" />

     

       203
       -
         //   <category android:name="android.intent.category.DEFAULT" />

     

       204
       -
         //   <category android:name="android.intent.category.BROWSABLE" />

     

       205
       -
         //   <data android:scheme="myapp" />

     

       206
       -
         // </intent-filter>

     

       207
       -
       

     

       208
       -
         // ========================================================================

     

       209
       -
         // Security best practices

     

       210
       -
         // ========================================================================

     

       211
       -
       

     

       212
       -
         // ✓ Tokens stored in secure storage (Keychain/EncryptedSharedPreferences)

     

       213
       -
         // ✓ DPoP binds tokens to cryptographic keys

     

       214
       -
         // ✓ PKCE prevents authorization code interception

     

       215
       -
         // ✓ State parameter prevents CSRF attacks

     

       216
       -
         // ✓ Automatic token refresh with concurrency control

     

       217
       -
         // ✓ Session cleanup on errors

     

       218
       -
       

     

       219
       -
         print('Example complete!');

     

       220
       -
       }

-104

packages/atproto_oauth_flutter/example/identity_resolver_example.dart

···

       1
       -
       /// Example usage of the atProto identity resolution layer.

     

       2
       -
       ///

     

       3
       -
       /// This demonstrates the critical functionality for decentralization:

     

       4
       -
       /// resolving handles and DIDs to find where user data is actually stored.

     

       5
       -
       

     

       6
       -
       import 'package:atproto_oauth_flutter/src/identity/identity.dart';

     

       7
       -
       

     

       8
       -
       Future<void> main() async {

     

       9
       -
         print('=== atProto Identity Resolution Examples ===\n');

     

       10
       -
       

     

       11
       -
         // Create an identity resolver

     

       12
       -
         // The handleResolverUrl should point to an XRPC service that implements

     

       13
       -
         // com.atproto.identity.resolveHandle (typically bsky.social for public resolution)

     

       14
       -
         final resolver = AtprotoIdentityResolver.withDefaults(

     

       15
       -
           handleResolverUrl: 'https://bsky.social',

     

       16
       -
         );

     

       17
       -
       

     

       18
       -
         print('Example 1: Resolve a Bluesky handle to find their PDS');

     

       19
       -
         print('--------------------------------------------------');

     

       20
       -
         try {

     

       21
       -
           // This is the most common use case: find where a user's data lives

     

       22
       -
           final pdsUrl = await resolver.resolveToPds('pfrazee.com');

     

       23
       -
           print('Handle: pfrazee.com');

     

       24
       -
           print('PDS URL: $pdsUrl');

     

       25
       -
           print('✓ This user hosts their data on: $pdsUrl\n');

     

       26
       -
         } catch (e) {

     

       27
       -
           print('Error: $e\n');

     

       28
       -
         }

     

       29
       -
       

     

       30
       -
         print('Example 2: Get full identity information');

     

       31
       -
         print('--------------------------------------------------');

     

       32
       -
         try {

     

       33
       -
           final info = await resolver.resolve('pfrazee.com');

     

       34
       -
           print('Handle: ${info.handle}');

     

       35
       -
           print('DID: ${info.did}');

     

       36
       -
           print('PDS URL: ${info.pdsUrl}');

     

       37
       -
           print('Has valid handle: ${info.hasValidHandle}');

     

       38
       -
           print('Also known as: ${info.didDoc.alsoKnownAs}');

     

       39
       -
           print('✓ Complete identity information retrieved\n');

     

       40
       -
         } catch (e) {

     

       41
       -
           print('Error: $e\n');

     

       42
       -
         }

     

       43
       -
       

     

       44
       -
         print('Example 3: Resolve from a DID');

     

       45
       -
         print('--------------------------------------------------');

     

       46
       -
         try {

     

       47
       -
           // You can also start from a DID

     

       48
       -
           final info = await resolver.resolveFromDid(

     

       49
       -
             'did:plc:ragtjsm2j2vknwkz3zp4oxrd',

     

       50
       -
           );

     

       51
       -
           print('DID: ${info.did}');

     

       52
       -
           print('Handle: ${info.handle}');

     

       53
       -
           print('PDS URL: ${info.pdsUrl}');

     

       54
       -
           print('✓ Resolved DID to handle and PDS\n');

     

       55
       -
         } catch (e) {

     

       56
       -
           print('Error: $e\n');

     

       57
       -
         }

     

       58
       -
       

     

       59
       -
         print('Example 4: Custom domain handle (CRITICAL for decentralization)');

     

       60
       -
         print('--------------------------------------------------');

     

       61
       -
         try {

     

       62
       -
           // This demonstrates why this code is essential:

     

       63
       -
           // Users can use their own domains and host on their own PDS

     

       64
       -
           final info = await resolver.resolve('jay.bsky.team');

     

       65
       -
           print('Handle: ${info.handle}');

     

       66
       -
           print('DID: ${info.did}');

     

       67
       -
           print('PDS URL: ${info.pdsUrl}');

     

       68
       -
           print('✓ Custom domain resolves to custom PDS (not hardcoded!)\n');

     

       69
       -
         } catch (e) {

     

       70
       -
           print('Error: $e\n');

     

       71
       -
         }

     

       72
       -
       

     

       73
       -
         print('Example 5: Validation - Invalid handle');

     

       74
       -
         print('--------------------------------------------------');

     

       75
       -
         try {

     

       76
       -
           await resolver.resolve('not-a-valid-handle');

     

       77
       -
         } catch (e) {

     

       78
       -
           print('✓ Correctly rejected invalid handle: $e\n');

     

       79
       -
         }

     

       80
       -
       

     

       81
       -
         print('=== Why This Matters ===');

     

       82
       -
         print('''

     

       83
       -
       This identity resolution layer is THE CRITICAL PIECE for atProto decentralization:

     

       84
       -
       

     

       85
       -
       1. **No Hardcoded Servers**: Unlike broken implementations that hardcode bsky.social,

     

       86
       -
          this correctly resolves each user's actual PDS location.

     

       87
       -
       

     

       88
       -
       2. **Custom Domains**: Users can use their own domains (e.g., alice.example.com)

     

       89
       -
          and host on any PDS they choose.

     

       90
       -
       

     

       91
       -
       3. **Portability**: Users can change their PDS without losing their DID or identity.

     

       92
       -
          The DID document always points to the current PDS location.

     

       93
       -
       

     

       94
       -
       4. **Bi-directional Validation**: We verify that:

     

       95
       -
          - Handle → DID resolution works

     

       96
       -
          - DID document contains the handle

     

       97
       -
          - Both directions match (security!)

     

       98
       -
       

     

       99
       -
       5. **Caching**: Built-in caching prevents redundant lookups while respecting TTLs.

     

       100
       -
       

     

       101
       -
       Without this layer, apps are locked to centralized servers. With it, atProto

     

       102
       -
       achieves true decentralization where users control their data location.

     

       103
       -
       ''');

     

       104
       -
       }

-104

packages/atproto_oauth_flutter/lib/atproto_oauth_flutter.dart

···

       1
       -
       /// atproto OAuth client for Flutter.

     

       2
       -
       ///

     

       3
       -
       /// This library provides OAuth authentication capabilities for AT Protocol

     

       4
       -
       /// (atproto) applications on Flutter/Dart platforms.

     

       5
       -
       ///

     

       6
       -
       /// This is a 1:1 port of the TypeScript @atproto/oauth-client package to Dart.

     

       7
       -
       ///

     

       8
       -
       /// ## Quick Start

     

       9
       -
       ///

     

       10
       -
       /// ```dart

     

       11
       -
       /// import 'package:atproto_oauth_flutter/atproto_oauth_flutter.dart';

     

       12
       -
       ///

     

       13
       -
       /// // 1. Initialize client

     

       14
       -
       /// final client = FlutterOAuthClient(

     

       15
       -
       ///   clientMetadata: ClientMetadata(

     

       16
       -
       ///     clientId: 'https://example.com/client-metadata.json',

     

       17
       -
       ///     redirectUris: ['myapp://oauth/callback'],

     

       18
       -
       ///     scope: 'atproto transition:generic',

     

       19
       -
       ///   ),

     

       20
       -
       /// );

     

       21
       -
       ///

     

       22
       -
       /// // 2. Sign in with handle

     

       23
       -
       /// final session = await client.signIn('alice.bsky.social');

     

       24
       -
       /// print('Signed in as: ${session.sub}');

     

       25
       -
       ///

     

       26
       -
       /// // 3. Use authenticated session

     

       27
       -
       /// // (Integrate with your atproto API client)

     

       28
       -
       ///

     

       29
       -
       /// // 4. Later: restore session

     

       30
       -
       /// final restored = await client.restore(session.sub);

     

       31
       -
       ///

     

       32
       -
       /// // 5. Sign out

     

       33
       -
       /// await client.revoke(session.sub);

     

       34
       -
       /// ```

     

       35
       -
       ///

     

       36
       -
       /// ## Features

     

       37
       -
       ///

     

       38
       -
       /// - Full OAuth 2.0 + OIDC support with PKCE

     

       39
       -
       /// - DPoP (Demonstrating Proof of Possession) for token security

     

       40
       -
       /// - Automatic token refresh

     

       41
       -
       /// - Secure session storage (flutter_secure_storage)

     

       42
       -
       /// - Handle and DID resolution

     

       43
       -
       /// - PAR (Pushed Authorization Request) support

     

       44
       -
       /// - Works with any atProto PDS or authorization server

     

       45
       -
       ///

     

       46
       -
       /// ## Security

     

       47
       -
       ///

     

       48
       -
       /// - Tokens stored in device secure storage (Keychain/EncryptedSharedPreferences)

     

       49
       -
       /// - DPoP binds tokens to cryptographic keys

     

       50
       -
       /// - PKCE prevents authorization code interception

     

       51
       -
       /// - Automatic session cleanup on errors

     

       52
       -
       ///

     

       53
       -
       library;

     

       54
       -
       

     

       55
       -
       // ============================================================================

     

       56
       -
       // Main API - Start here!

     

       57
       -
       // ============================================================================

     

       58
       -
       

     

       59
       -
       /// High-level Flutter OAuth client (recommended for most apps)

     

       60
       -
       export 'src/platform/flutter_oauth_client.dart';

     

       61
       -
       

     

       62
       -
       /// Router integration helpers (for go_router, auto_route, etc.)

     

       63
       -
       export 'src/platform/flutter_oauth_router_helper.dart';

     

       64
       -
       

     

       65
       -
       // ============================================================================

     

       66
       -
       // Core OAuth Client

     

       67
       -
       // ============================================================================

     

       68
       -
       

     

       69
       -
       /// Core OAuth client and types (for advanced use cases)

     

       70
       -
       export 'src/client/oauth_client.dart';

     

       71
       -
       

     

       72
       -
       // ============================================================================

     

       73
       -
       // Sessions

     

       74
       -
       // ============================================================================

     

       75
       -
       

     

       76
       -
       /// OAuth session types

     

       77
       -
       export 'src/session/oauth_session.dart';

     

       78
       -
       

     

       79
       -
       // ============================================================================

     

       80
       -
       // Types

     

       81
       -
       // ============================================================================

     

       82
       -
       

     

       83
       -
       /// Core types and options

     

       84
       -
       export 'src/types.dart';

     

       85
       -
       

     

       86
       -
       // ============================================================================

     

       87
       -
       // Platform Implementations (for custom configurations)

     

       88
       -
       // ============================================================================

     

       89
       -
       

     

       90
       -
       /// Storage implementations (for customization)

     

       91
       -
       export 'src/platform/flutter_stores.dart';

     

       92
       -
       

     

       93
       -
       /// Runtime implementation (cryptographic operations)

     

       94
       -
       export 'src/platform/flutter_runtime.dart';

     

       95
       -
       

     

       96
       -
       /// Key implementation (EC keys with pointycastle)

     

       97
       -
       export 'src/platform/flutter_key.dart';

     

       98
       -
       

     

       99
       -
       // ============================================================================

     

       100
       -
       // Errors

     

       101
       -
       // ============================================================================

     

       102
       -
       

     

       103
       -
       /// All OAuth error types

     

       104
       -
       export 'src/errors/errors.dart';

-977

packages/atproto_oauth_flutter/lib/src/client/oauth_client.dart

···

       1
       -
       import 'dart:async';

     

       2
       -
       import 'package:dio/dio.dart';

     

       3
       -
       import 'package:flutter/foundation.dart';

     

       4
       -
       

     

       5
       -
       import '../constants.dart';

     

       6
       -
       import '../dpop/fetch_dpop.dart' show InMemoryStore;

     

       7
       -
       import '../errors/auth_method_unsatisfiable_error.dart';

     

       8
       -
       import '../errors/oauth_callback_error.dart';

     

       9
       -
       import '../errors/token_revoked_error.dart';

     

       10
       -
       import '../identity/constants.dart';

     

       11
       -
       import '../identity/did_helpers.dart' show assertAtprotoDid;

     

       12
       -
       import '../identity/did_resolver.dart' show DidCache;

     

       13
       -
       import '../identity/handle_resolver.dart' show HandleCache;

     

       14
       -
       import '../identity/identity_resolver.dart';

     

       15
       -
       import '../oauth/authorization_server_metadata_resolver.dart' as auth_resolver;

     

       16
       -
       import '../oauth/client_auth.dart';

     

       17
       -
       import '../oauth/oauth_resolver.dart';

     

       18
       -
       import '../oauth/oauth_server_agent.dart';

     

       19
       -
       import '../oauth/oauth_server_factory.dart';

     

       20
       -
       import '../oauth/protected_resource_metadata_resolver.dart';

     

       21
       -
       import '../oauth/validate_client_metadata.dart';

     

       22
       -
       import '../platform/flutter_key.dart';

     

       23
       -
       import '../runtime/runtime.dart' as runtime_lib;

     

       24
       -
       import '../runtime/runtime_implementation.dart';

     

       25
       -
       import '../session/oauth_session.dart'

     

       26
       -
           show OAuthSession, Session, SessionGetterInterface;

     

       27
       -
       import '../session/session_getter.dart';

     

       28
       -
       import '../session/state_store.dart';

     

       29
       -
       import '../types.dart';

     

       30
       -
       import '../util.dart';

     

       31
       -
       

     

       32
       -
       // Re-export types needed for OAuthClientOptions

     

       33
       -
       export '../identity/did_resolver.dart' show DidCache, DidResolver;

     

       34
       -
       export '../identity/handle_resolver.dart' show HandleCache, HandleResolver;

     

       35
       -
       export '../identity/identity_resolver.dart' show IdentityResolver;

     

       36
       -
       export '../oauth/authorization_server_metadata_resolver.dart'

     

       37
       -
           show AuthorizationServerMetadataCache;

     

       38
       -
       export '../oauth/oauth_server_agent.dart' show DpopNonceCache;

     

       39
       -
       export '../oauth/protected_resource_metadata_resolver.dart'

     

       40
       -
           show ProtectedResourceMetadataCache;

     

       41
       -
       export '../runtime/runtime_implementation.dart' show RuntimeImplementation, Key;

     

       42
       -
       export '../oauth/client_auth.dart' show Keyset;

     

       43
       -
       export '../session/session_getter.dart'

     

       44
       -
           show SessionStore, SessionUpdatedEvent, SessionDeletedEvent;

     

       45
       -
       export '../session/state_store.dart' show StateStore, InternalStateData;

     

       46
       -
       export '../types.dart' show ClientMetadata, AuthorizeOptions, CallbackOptions;

     

       47
       -
       

     

       48
       -
       /// OAuth response mode.

     

       49
       -
       enum OAuthResponseMode {

     

       50
       -
         /// Parameters in query string (default, most compatible)

     

       51
       -
         query('query'),

     

       52
       -
       

     

       53
       -
         /// Parameters in URL fragment (for single-page apps)

     

       54
       -
         fragment('fragment');

     

       55
       -
       

     

       56
       -
         final String value;

     

       57
       -
         const OAuthResponseMode(this.value);

     

       58
       -
       

     

       59
       -
         @override

     

       60
       -
         String toString() => value;

     

       61
       -
       }

     

       62
       -
       

     

       63
       -
       /// Options for constructing an OAuthClient.

     

       64
       -
       ///

     

       65
       -
       /// This includes all configuration, storage, and service dependencies

     

       66
       -
       /// needed to implement the complete OAuth flow.

     

       67
       -
       class OAuthClientOptions {

     

       68
       -
         // Config

     

       69
       -
         /// Response mode for OAuth (query or fragment)

     

       70
       -
         final OAuthResponseMode responseMode;

     

       71
       -
       

     

       72
       -
         /// Client metadata (validated before use)

     

       73
       -
         final Map<String, dynamic> clientMetadata;

     

       74
       -
       

     

       75
       -
         /// Optional keyset for confidential clients (private_key_jwt)

     

       76
       -
         final Keyset? keyset;

     

       77
       -
       

     

       78
       -
         /// Whether to allow HTTP connections (for development only)

     

       79
       -
         ///

     

       80
       -
         /// This affects:

     

       81
       -
         /// - OAuth authorization/resource servers

     

       82
       -
         /// - did:web document fetching

     

       83
       -
         ///

     

       84
       -
         /// Note: PLC directory connections are controlled separately.

     

       85
       -
         final bool allowHttp;

     

       86
       -
       

     

       87
       -
         // Stores

     

       88
       -
         /// Storage for OAuth state during authorization flow

     

       89
       -
         final StateStore stateStore;

     

       90
       -
       

     

       91
       -
         /// Storage for session tokens

     

       92
       -
         final SessionStore sessionStore;

     

       93
       -
       

     

       94
       -
         /// Optional cache for authorization server metadata

     

       95
       -
         final auth_resolver.AuthorizationServerMetadataCache?

     

       96
       -
         authorizationServerMetadataCache;

     

       97
       -
       

     

       98
       -
         /// Optional cache for protected resource metadata

     

       99
       -
         final ProtectedResourceMetadataCache? protectedResourceMetadataCache;

     

       100
       -
       

     

       101
       -
         /// Optional cache for DPoP nonces

     

       102
       -
         final DpopNonceCache? dpopNonceCache;

     

       103
       -
       

     

       104
       -
         /// Optional cache for DID documents

     

       105
       -
         final DidCache? didCache;

     

       106
       -
       

     

       107
       -
         /// Optional cache for handle → DID resolutions

     

       108
       -
         final HandleCache? handleCache;

     

       109
       -
       

     

       110
       -
         // Services

     

       111
       -
         /// Platform-specific cryptographic operations

     

       112
       -
         final RuntimeImplementation runtimeImplementation;

     

       113
       -
       

     

       114
       -
         /// Optional HTTP client (Dio instance)

     

       115
       -
         final Dio? dio;

     

       116
       -
       

     

       117
       -
         /// Optional custom identity resolver

     

       118
       -
         final IdentityResolver? identityResolver;

     

       119
       -
       

     

       120
       -
         /// PLC directory URL (for DID resolution)

     

       121
       -
         final String? plcDirectoryUrl;

     

       122
       -
       

     

       123
       -
         /// Handle resolver URL (for handle → DID resolution)

     

       124
       -
         final String? handleResolverUrl;

     

       125
       -
       

     

       126
       -
         const OAuthClientOptions({

     

       127
       -
           required this.responseMode,

     

       128
       -
           required this.clientMetadata,

     

       129
       -
           this.keyset,

     

       130
       -
           this.allowHttp = false,

     

       131
       -
           required this.stateStore,

     

       132
       -
           required this.sessionStore,

     

       133
       -
           this.authorizationServerMetadataCache,

     

       134
       -
           this.protectedResourceMetadataCache,

     

       135
       -
           this.dpopNonceCache,

     

       136
       -
           this.didCache,

     

       137
       -
           this.handleCache,

     

       138
       -
           required this.runtimeImplementation,

     

       139
       -
           this.dio,

     

       140
       -
           this.identityResolver,

     

       141
       -
           this.plcDirectoryUrl,

     

       142
       -
           this.handleResolverUrl,

     

       143
       -
         });

     

       144
       -
       }

     

       145
       -
       

     

       146
       -
       /// Result of a successful OAuth callback.

     

       147
       -
       class CallbackResult {

     

       148
       -
         /// The authenticated session

     

       149
       -
         final OAuthSession session;

     

       150
       -
       

     

       151
       -
         /// The application state from the original authorize call

     

       152
       -
         final String? state;

     

       153
       -
       

     

       154
       -
         const CallbackResult({required this.session, this.state});

     

       155
       -
       }

     

       156
       -
       

     

       157
       -
       /// Options for fetching client metadata from a discoverable client ID.

     

       158
       -
       class OAuthClientFetchMetadataOptions {

     

       159
       -
         /// The discoverable client ID (HTTPS URL)

     

       160
       -
         final String clientId;

     

       161
       -
       

     

       162
       -
         /// Optional HTTP client

     

       163
       -
         final Dio? dio;

     

       164
       -
       

     

       165
       -
         /// Optional cancellation token

     

       166
       -
         final CancelToken? cancelToken;

     

       167
       -
       

     

       168
       -
         const OAuthClientFetchMetadataOptions({

     

       169
       -
           required this.clientId,

     

       170
       -
           this.dio,

     

       171
       -
           this.cancelToken,

     

       172
       -
         });

     

       173
       -
       }

     

       174
       -
       

     

       175
       -
       /// Main OAuth client for atProto OAuth flows.

     

       176
       -
       ///

     

       177
       -
       /// This is the primary class that developers interact with. It orchestrates:

     

       178
       -
       /// - Authorization flow (authorize → callback)

     

       179
       -
       /// - Session restoration (restore)

     

       180
       -
       /// - Token revocation (revoke)

     

       181
       -
       /// - Session lifecycle events

     

       182
       -
       ///

     

       183
       -
       /// Usage:

     

       184
       -
       /// ```dart

     

       185
       -
       /// final client = OAuthClient(

     

       186
       -
       ///   clientMetadata: {

     

       187
       -
       ///     'client_id': 'https://example.com/client-metadata.json',

     

       188
       -
       ///     'redirect_uris': ['myapp://oauth/callback'],

     

       189
       -
       ///     'scope': 'atproto',

     

       190
       -
       ///   },

     

       191
       -
       ///   responseMode: OAuthResponseMode.query,

     

       192
       -
       ///   stateStore: MyStateStore(),

     

       193
       -
       ///   sessionStore: MySessionStore(),

     

       194
       -
       ///   runtimeImplementation: MyRuntimeImplementation(),

     

       195
       -
       /// );

     

       196
       -
       ///

     

       197
       -
       /// // Start authorization

     

       198
       -
       /// final authUrl = await client.authorize('alice.bsky.social');

     

       199
       -
       ///

     

       200
       -
       /// // Handle callback

     

       201
       -
       /// final result = await client.callback(callbackParams);

     

       202
       -
       /// print('Signed in as: ${result.session.sub}');

     

       203
       -
       ///

     

       204
       -
       /// // Restore session later

     

       205
       -
       /// final session = await client.restore('did:plc:abc123');

     

       206
       -
       ///

     

       207
       -
       /// // Revoke session

     

       208
       -
       /// await client.revoke('did:plc:abc123');

     

       209
       -
       /// ```

     

       210
       -
       class OAuthClient extends CustomEventTarget<Map<String, dynamic>> {

     

       211
       -
         // Config

     

       212
       -
         /// Validated client metadata

     

       213
       -
         final ClientMetadata clientMetadata;

     

       214
       -
       

     

       215
       -
         /// OAuth response mode (query or fragment)

     

       216
       -
         final OAuthResponseMode responseMode;

     

       217
       -
       

     

       218
       -
         /// Optional keyset for confidential clients

     

       219
       -
         final Keyset? keyset;

     

       220
       -
       

     

       221
       -
         // Services

     

       222
       -
         /// Runtime for cryptographic operations

     

       223
       -
         final runtime_lib.Runtime runtime;

     

       224
       -
       

     

       225
       -
         /// HTTP client

     

       226
       -
         final Dio dio;

     

       227
       -
       

     

       228
       -
         /// OAuth resolver for identity → metadata

     

       229
       -
         final OAuthResolver oauthResolver;

     

       230
       -
       

     

       231
       -
         /// Factory for creating OAuth server agents

     

       232
       -
         final OAuthServerFactory serverFactory;

     

       233
       -
       

     

       234
       -
         // Stores

     

       235
       -
         /// Session management with automatic refresh

     

       236
       -
         final SessionGetter _sessionGetter;

     

       237
       -
       

     

       238
       -
         /// OAuth state storage

     

       239
       -
         final StateStore _stateStore;

     

       240
       -
       

     

       241
       -
         // Event streams

     

       242
       -
         final StreamController<SessionUpdatedEvent> _updatedController =

     

       243
       -
             StreamController<SessionUpdatedEvent>.broadcast();

     

       244
       -
         final StreamController<SessionDeletedEvent> _deletedController =

     

       245
       -
             StreamController<SessionDeletedEvent>.broadcast();

     

       246
       -
       

     

       247
       -
         /// Stream of session update events

     

       248
       -
         Stream<SessionUpdatedEvent> get onUpdated => _updatedController.stream;

     

       249
       -
       

     

       250
       -
         /// Stream of session deletion events

     

       251
       -
         Stream<SessionDeletedEvent> get onDeleted => _deletedController.stream;

     

       252
       -
       

     

       253
       -
         /// Constructs an OAuthClient with the given options.

     

       254
       -
         ///

     

       255
       -
         /// Throws [FormatException] if client metadata is invalid.

     

       256
       -
         /// Throws [TypeError] if keyset configuration is incorrect.

     

       257
       -
         OAuthClient(OAuthClientOptions options)

     

       258
       -
           : keyset = options.keyset,

     

       259
       -
             responseMode = options.responseMode,

     

       260
       -
             runtime = runtime_lib.Runtime(options.runtimeImplementation),

     

       261
       -
             dio = options.dio ?? Dio(),

     

       262
       -
             _stateStore = options.stateStore,

     

       263
       -
             clientMetadata = validateClientMetadata(

     

       264
       -
               options.clientMetadata,

     

       265
       -
               options.keyset,

     

       266
       -
             ),

     

       267
       -
             oauthResolver = _createOAuthResolver(options),

     

       268
       -
             serverFactory = _createServerFactory(options),

     

       269
       -
             _sessionGetter = _createSessionGetter(options) {

     

       270
       -
           // Proxy session events from SessionGetter

     

       271
       -
           _sessionGetter.onUpdated.listen((event) {

     

       272
       -
             _updatedController.add(event);

     

       273
       -
             dispatchCustomEvent('updated', event);

     

       274
       -
           });

     

       275
       -
       

     

       276
       -
           _sessionGetter.onDeleted.listen((event) {

     

       277
       -
             _deletedController.add(event);

     

       278
       -
             dispatchCustomEvent('deleted', event);

     

       279
       -
           });

     

       280
       -
         }

     

       281
       -
       

     

       282
       -
         /// Creates the OAuth resolver.

     

       283
       -
         static OAuthResolver _createOAuthResolver(OAuthClientOptions options) {

     

       284
       -
           final dio = options.dio ?? Dio();

     

       285
       -
       

     

       286
       -
           return OAuthResolver(

     

       287
       -
             identityResolver:

     

       288
       -
                 options.identityResolver ??

     

       289
       -
                 AtprotoIdentityResolver.withDefaults(

     

       290
       -
                   handleResolverUrl:

     

       291
       -
                       options.handleResolverUrl ?? 'https://bsky.social',

     

       292
       -
                   plcDirectoryUrl: options.plcDirectoryUrl,

     

       293
       -
                   dio: dio,

     

       294
       -
                   didCache: options.didCache,

     

       295
       -
                   handleCache: options.handleCache,

     

       296
       -
                 ),

     

       297
       -
             protectedResourceMetadataResolver: OAuthProtectedResourceMetadataResolver(

     

       298
       -
               options.protectedResourceMetadataCache ??

     

       299
       -
                   InMemoryStore<String, Map<String, dynamic>>(),

     

       300
       -
               dio: dio,

     

       301
       -
               config: OAuthProtectedResourceMetadataResolverConfig(

     

       302
       -
                 allowHttpResource: options.allowHttp,

     

       303
       -
               ),

     

       304
       -
             ),

     

       305
       -
             authorizationServerMetadataResolver:

     

       306
       -
                 auth_resolver.OAuthAuthorizationServerMetadataResolver(

     

       307
       -
                   options.authorizationServerMetadataCache ??

     

       308
       -
                       InMemoryStore<String, Map<String, dynamic>>(),

     

       309
       -
                   dio: dio,

     

       310
       -
                   config:

     

       311
       -
                       auth_resolver.OAuthAuthorizationServerMetadataResolverConfig(

     

       312
       -
                         allowHttpIssuer: options.allowHttp,

     

       313
       -
                       ),

     

       314
       -
                 ),

     

       315
       -
           );

     

       316
       -
         }

     

       317
       -
       

     

       318
       -
         /// Creates the OAuth server factory.

     

       319
       -
         static OAuthServerFactory _createServerFactory(OAuthClientOptions options) {

     

       320
       -
           return OAuthServerFactory(

     

       321
       -
             clientMetadata: validateClientMetadata(

     

       322
       -
               options.clientMetadata,

     

       323
       -
               options.keyset,

     

       324
       -
             ),

     

       325
       -
             runtime: runtime_lib.Runtime(options.runtimeImplementation),

     

       326
       -
             resolver: _createOAuthResolver(options),

     

       327
       -
             dio: options.dio ?? Dio(),

     

       328
       -
             keyset: options.keyset,

     

       329
       -
             dpopNonceCache: options.dpopNonceCache ?? InMemoryStore<String, String>(),

     

       330
       -
           );

     

       331
       -
         }

     

       332
       -
       

     

       333
       -
         /// Creates the session getter.

     

       334
       -
         static SessionGetter _createSessionGetter(OAuthClientOptions options) {

     

       335
       -
           return SessionGetter(

     

       336
       -
             sessionStore: options.sessionStore,

     

       337
       -
             serverFactory: _createServerFactory(options),

     

       338
       -
             runtime: runtime_lib.Runtime(options.runtimeImplementation),

     

       339
       -
           );

     

       340
       -
         }

     

       341
       -
       

     

       342
       -
         /// Fetches client metadata from a discoverable client ID URL.

     

       343
       -
         ///

     

       344
       -
         /// This is a static helper method for fetching metadata before

     

       345
       -
         /// constructing the OAuthClient.

     

       346
       -
         ///

     

       347
       -
         /// See: https://datatracker.ietf.org/doc/draft-ietf-oauth-client-id-metadata-document/

     

       348
       -
         static Future<Map<String, dynamic>> fetchMetadata(

     

       349
       -
           OAuthClientFetchMetadataOptions options,

     

       350
       -
         ) async {

     

       351
       -
           final dio = options.dio ?? Dio();

     

       352
       -
           final clientId = options.clientId;

     

       353
       -
       

     

       354
       -
           try {

     

       355
       -
             final response = await dio.getUri<Map<String, dynamic>>(

     

       356
       -
               Uri.parse(clientId),

     

       357
       -
               options: Options(

     

       358
       -
                 followRedirects: false,

     

       359
       -
                 validateStatus: (status) => status == 200,

     

       360
       -
                 responseType: ResponseType.json,

     

       361
       -
               ),

     

       362
       -
               cancelToken: options.cancelToken,

     

       363
       -
             );

     

       364
       -
       

     

       365
       -
             // Validate content type

     

       366
       -
             final contentType = response.headers.value('content-type');

     

       367
       -
             final mime = contentType?.split(';')[0].trim();

     

       368
       -
             if (mime != 'application/json') {

     

       369
       -
               throw FormatException('Invalid client metadata content type: $mime');

     

       370
       -
             }

     

       371
       -
       

     

       372
       -
             final data = response.data;

     

       373
       -
             if (data == null) {

     

       374
       -
               throw FormatException('Empty client metadata response');

     

       375
       -
             }

     

       376
       -
       

     

       377
       -
             return data;

     

       378
       -
           } catch (e) {

     

       379
       -
             if (e is DioException) {

     

       380
       -
               throw Exception('Failed to fetch client metadata: ${e.message}');

     

       381
       -
             }

     

       382
       -
             rethrow;

     

       383
       -
           }

     

       384
       -
         }

     

       385
       -
       

     

       386
       -
         /// Exposes the identity resolver for convenience.

     

       387
       -
         IdentityResolver get identityResolver => oauthResolver.identityResolver;

     

       388
       -
       

     

       389
       -
         /// Returns the public JWKS for this client (for confidential clients).

     

       390
       -
         ///

     

       391
       -
         /// This is the JWKS that should be published at the client's jwks_uri

     

       392
       -
         /// or included in the client metadata.

     

       393
       -
         Map<String, dynamic> get jwks {

     

       394
       -
           if (keyset == null) {

     

       395
       -
             return {'keys': <Map<String, dynamic>>[]};

     

       396
       -
           }

     

       397
       -
           return keyset!.toJSON();

     

       398
       -
         }

     

       399
       -
       

     

       400
       -
         /// Initiates an OAuth authorization flow.

     

       401
       -
         ///

     

       402
       -
         /// This method:

     

       403
       -
         /// 1. Resolves the input (handle, DID, or URL) to OAuth metadata

     

       404
       -
         /// 2. Generates PKCE parameters

     

       405
       -
         /// 3. Generates DPoP key

     

       406
       -
         /// 4. Negotiates client authentication method

     

       407
       -
         /// 5. Stores internal state

     

       408
       -
         /// 6. Uses PAR (Pushed Authorization Request) if supported

     

       409
       -
         /// 7. Returns the authorization URL to open in a browser

     

       410
       -
         ///

     

       411
       -
         /// The [input] can be:

     

       412
       -
         /// - An atProto handle (e.g., "alice.bsky.social")

     

       413
       -
         /// - A DID (e.g., "did:plc:...")

     

       414
       -
         /// - A PDS URL (e.g., "https://pds.example.com")

     

       415
       -
         /// - An authorization server URL (e.g., "https://auth.example.com")

     

       416
       -
         ///

     

       417
       -
         /// The [options] can specify:

     

       418
       -
         /// - redirectUri: Override the default redirect URI

     

       419
       -
         /// - state: Application state to preserve

     

       420
       -
         /// - scope: Override the default scope

     

       421
       -
         /// - Other OIDC parameters (prompt, display, etc.)

     

       422
       -
         ///

     

       423
       -
         /// Throws [FormatException] if parameters are invalid.

     

       424
       -
         /// Throws [OAuthResolverError] if resolution fails.

     

       425
       -
         Future<Uri> authorize(

     

       426
       -
           String input, {

     

       427
       -
           AuthorizeOptions? options,

     

       428
       -
           CancelToken? cancelToken,

     

       429
       -
         }) async {

     

       430
       -
           final opts = options ?? const AuthorizeOptions();

     

       431
       -
       

     

       432
       -
           // Validate redirect URI

     

       433
       -
           final redirectUri = opts.redirectUri ?? clientMetadata.redirectUris.first;

     

       434
       -
           if (!clientMetadata.redirectUris.contains(redirectUri)) {

     

       435
       -
             throw FormatException('Invalid redirect_uri: $redirectUri');

     

       436
       -
           }

     

       437
       -
       

     

       438
       -
           // Resolve input to OAuth metadata

     

       439
       -
           final resolved = await oauthResolver.resolve(

     

       440
       -
             input,

     

       441
       -
             auth_resolver.GetCachedOptions(cancelToken: cancelToken),

     

       442
       -
           );

     

       443
       -
       

     

       444
       -
           final metadata = resolved.metadata;

     

       445
       -
       

     

       446
       -
           // Generate PKCE

     

       447
       -
           final pkce = await runtime.generatePKCE();

     

       448
       -
       

     

       449
       -
           // Generate DPoP key

     

       450
       -
           final dpopAlgs = metadata['dpop_signing_alg_values_supported'] as List?;

     

       451
       -
           final dpopKey = await runtime.generateKey(

     

       452
       -
             dpopAlgs?.cast<String>() ?? [fallbackAlg],

     

       453
       -
           );

     

       454
       -
       

     

       455
       -
           // Compute DPoP JWK thumbprint for authorization requests.

     

       456
       -
           // Required by RFC 9449 §7 to bind the subsequently issued code to this key.

     

       457
       -
           final bareJwk = dpopKey.bareJwk;

     

       458
       -
           if (bareJwk == null) {

     

       459
       -
             throw StateError('DPoP key must provide a public JWK representation');

     

       460
       -
           }

     

       461
       -
           final generatedDpopJkt = await runtime.calculateJwkThumbprint(bareJwk);

     

       462
       -
       

     

       463
       -
           // Negotiate client authentication method

     

       464
       -
           final authMethod = negotiateClientAuthMethod(

     

       465
       -
             metadata,

     

       466
       -
             clientMetadata,

     

       467
       -
             keyset,

     

       468
       -
           );

     

       469
       -
       

     

       470
       -
           // Generate state parameter

     

       471
       -
           final state = await runtime.generateNonce();

     

       472
       -
       

     

       473
       -
           // Store internal state for callback validation

     

       474
       -
           // IMPORTANT: Store the FULL private JWK, not just bareJwk (public key only)

     

       475
       -
           // We need the private key to restore the DPoP key during token exchange

     

       476
       -
           final dpopKeyJwk = (dpopKey as dynamic).privateJwk ?? dpopKey.bareJwk ?? {};

     

       477
       -
       

     

       478
       -
           if (kDebugMode) {

     

       479
       -
             print('🔑 Storing DPoP key for authorization flow');

     

       480
       -
           }

     

       481
       -
       

     

       482
       -
           await _stateStore.set(

     

       483
       -
             state,

     

       484
       -
             InternalStateData(

     

       485
       -
               iss: metadata['issuer'] as String,

     

       486
       -
               dpopKey: dpopKeyJwk,

     

       487
       -
               authMethod: authMethod.toJson(),

     

       488
       -
               verifier: pkce['verifier'] as String,

     

       489
       -
               redirectUri: redirectUri, // Store the exact redirectUri used in PAR

     

       490
       -
               appState: opts.state,

     

       491
       -
             ),

     

       492
       -
           );

     

       493
       -
       

     

       494
       -
           // Build authorization request parameters

     

       495
       -
           final parameters = <String, String>{

     

       496
       -
             'client_id': clientMetadata.clientId!,

     

       497
       -
             'redirect_uri': redirectUri,

     

       498
       -
             'code_challenge': pkce['challenge'] as String,

     

       499
       -
             'code_challenge_method': pkce['method'] as String,

     

       500
       -
             'state': state,

     

       501
       -
             'response_mode': responseMode.value,

     

       502
       -
             'response_type': 'code',

     

       503
       -
             'scope': opts.scope ?? clientMetadata.scope ?? 'atproto',

     

       504
       -
             'dpop_jkt': opts.dpopJkt ?? generatedDpopJkt,

     

       505
       -
           };

     

       506
       -
       

     

       507
       -
           // Add login hint if we have identity info

     

       508
       -
           if (resolved.identityInfo != null) {

     

       509
       -
             final handle = resolved.identityInfo!.handle;

     

       510
       -
             final did = resolved.identityInfo!.did;

     

       511
       -
             if (handle != handleInvalid) {

     

       512
       -
               parameters['login_hint'] = handle;

     

       513
       -
             } else {

     

       514
       -
               parameters['login_hint'] = did;

     

       515
       -
             }

     

       516
       -
           }

     

       517
       -
       

     

       518
       -
           // Add optional parameters from options

     

       519
       -
           if (opts.nonce != null) parameters['nonce'] = opts.nonce!;

     

       520
       -
           if (opts.display != null) parameters['display'] = opts.display!;

     

       521
       -
           if (opts.prompt != null) parameters['prompt'] = opts.prompt!;

     

       522
       -
           if (opts.maxAge != null) parameters['max_age'] = opts.maxAge.toString();

     

       523
       -
           if (opts.uiLocales != null) parameters['ui_locales'] = opts.uiLocales!;

     

       524
       -
           if (opts.idTokenHint != null) {

     

       525
       -
             parameters['id_token_hint'] = opts.idTokenHint!;

     

       526
       -
           }

     

       527
       -
       

     

       528
       -
           // Build authorization URL

     

       529
       -
           final authorizationUrl = Uri.parse(

     

       530
       -
             metadata['authorization_endpoint'] as String,

     

       531
       -
           );

     

       532
       -
       

     

       533
       -
           // Validate authorization endpoint protocol

     

       534
       -
           if (authorizationUrl.scheme != 'https' &&

     

       535
       -
               authorizationUrl.scheme != 'http') {

     

       536
       -
             throw FormatException(

     

       537
       -
               'Invalid authorization endpoint protocol: ${authorizationUrl.scheme}',

     

       538
       -
             );

     

       539
       -
           }

     

       540
       -
       

     

       541
       -
           // Use PAR (Pushed Authorization Request) if supported

     

       542
       -
           final parEndpoint =

     

       543
       -
               metadata['pushed_authorization_request_endpoint'] as String?;

     

       544
       -
           final requiresPar =

     

       545
       -
               metadata['require_pushed_authorization_requests'] as bool? ?? false;

     

       546
       -
       

     

       547
       -
           if (parEndpoint != null) {

     

       548
       -
             // Server supports PAR, use it

     

       549
       -
             final server = await serverFactory.fromMetadata(

     

       550
       -
               metadata,

     

       551
       -
               authMethod,

     

       552
       -
               dpopKey,

     

       553
       -
             );

     

       554
       -
       

     

       555
       -
             final parResponse = await server.request(

     

       556
       -
               'pushed_authorization_request',

     

       557
       -
               parameters,

     

       558
       -
             );

     

       559
       -
       

     

       560
       -
             final requestUri = parResponse['request_uri'] as String;

     

       561
       -
       

     

       562
       -
             // Return simplified URL with just request_uri

     

       563
       -
             return authorizationUrl.replace(

     

       564
       -
               queryParameters: {

     

       565
       -
                 'client_id': clientMetadata.clientId!,

     

       566
       -
                 'request_uri': requestUri,

     

       567
       -
               },

     

       568
       -
             );

     

       569
       -
           } else if (requiresPar) {

     

       570
       -
             throw Exception(

     

       571
       -
               'Server requires pushed authorization requests (PAR) but no PAR endpoint is available',

     

       572
       -
             );

     

       573
       -
           } else {

     

       574
       -
             // No PAR support, use direct authorization request

     

       575
       -
             final fullUrl = authorizationUrl.replace(queryParameters: parameters);

     

       576
       -
       

     

       577
       -
             // Check URL length (2048 byte limit for some browsers)

     

       578
       -
             final urlLength = fullUrl.toString().length;

     

       579
       -
             if (urlLength >= 2048) {

     

       580
       -
               throw Exception('Login URL too long ($urlLength bytes)');

     

       581
       -
             }

     

       582
       -
       

     

       583
       -
             return fullUrl;

     

       584
       -
           }

     

       585
       -
         }

     

       586
       -
       

     

       587
       -
         /// Handles the OAuth callback after user authorization.

     

       588
       -
         ///

     

       589
       -
         /// This method:

     

       590
       -
         /// 1. Validates the state parameter

     

       591
       -
         /// 2. Retrieves stored internal state

     

       592
       -
         /// 3. Checks for error responses

     

       593
       -
         /// 4. Validates issuer (if provided)

     

       594
       -
         /// 5. Exchanges authorization code for tokens

     

       595
       -
         /// 6. Creates and stores session

     

       596
       -
         /// 7. Cleans up state

     

       597
       -
         ///

     

       598
       -
         /// The [params] should be the query parameters from the callback URL.

     

       599
       -
         ///

     

       600
       -
         /// The [options] can specify:

     

       601
       -
         /// - redirectUri: Must match the one used in authorize()

     

       602
       -
         ///

     

       603
       -
         /// Returns a [CallbackResult] with the session and application state.

     

       604
       -
         ///

     

       605
       -
         /// Throws [OAuthCallbackError] if the callback contains errors or is invalid.

     

       606
       -
         Future<CallbackResult> callback(

     

       607
       -
           Map<String, String> params, {

     

       608
       -
           CallbackOptions? options,

     

       609
       -
           CancelToken? cancelToken,

     

       610
       -
         }) async {

     

       611
       -
           final opts = options ?? const CallbackOptions();

     

       612
       -
       

     

       613
       -
           // Check for JARM (not supported)

     

       614
       -
           final responseJwt = params['response'];

     

       615
       -
           if (responseJwt != null) {

     

       616
       -
             throw OAuthCallbackError(params, message: 'JARM not supported');

     

       617
       -
           }

     

       618
       -
       

     

       619
       -
           // Extract parameters

     

       620
       -
           final issuerParam = params['iss'];

     

       621
       -
           final stateParam = params['state'];

     

       622
       -
           final errorParam = params['error'];

     

       623
       -
           final codeParam = params['code'];

     

       624
       -
       

     

       625
       -
           // Validate state parameter

     

       626
       -
           if (stateParam == null) {

     

       627
       -
             throw OAuthCallbackError(params, message: 'Missing "state" parameter');

     

       628
       -
           }

     

       629
       -
       

     

       630
       -
           // Retrieve internal state

     

       631
       -
           final stateData = await _stateStore.get(stateParam);

     

       632
       -
           if (stateData == null) {

     

       633
       -
             throw OAuthCallbackError(

     

       634
       -
               params,

     

       635
       -
               message: 'Unknown authorization session "$stateParam"',

     

       636
       -
             );

     

       637
       -
           }

     

       638
       -
       

     

       639
       -
           // Prevent replay attacks - delete state immediately

     

       640
       -
           await _stateStore.del(stateParam);

     

       641
       -
       

     

       642
       -
           try {

     

       643
       -
             // Check for error response

     

       644
       -
             if (errorParam != null) {

     

       645
       -
               throw OAuthCallbackError(params, state: stateData.appState);

     

       646
       -
             }

     

       647
       -
       

     

       648
       -
             // Validate authorization code

     

       649
       -
             if (codeParam == null) {

     

       650
       -
               throw OAuthCallbackError(

     

       651
       -
                 params,

     

       652
       -
                 message: 'Missing "code" query param',

     

       653
       -
                 state: stateData.appState,

     

       654
       -
               );

     

       655
       -
             }

     

       656
       -
       

     

       657
       -
             // Create OAuth server agent

     

       658
       -
             final authMethod =

     

       659
       -
                 stateData.authMethod != null

     

       660
       -
                     ? ClientAuthMethod.fromJson(

     

       661
       -
                       stateData.authMethod as Map<String, dynamic>,

     

       662
       -
                     )

     

       663
       -
                     : const ClientAuthMethod.none(); // Legacy fallback

     

       664
       -
       

     

       665
       -
             // Restore dpopKey from stored private JWK

     

       666
       -
             // Restore DPoP key with error handling for corrupted JWK data

     

       667
       -
             final FlutterKey dpopKey;

     

       668
       -
             try {

     

       669
       -
               dpopKey = FlutterKey.fromJwk(stateData.dpopKey as Map<String, dynamic>);

     

       670
       -
               if (kDebugMode) {

     

       671
       -
                 print('🔓 DPoP key restored successfully for token exchange');

     

       672
       -
               }

     

       673
       -
             } catch (e) {

     

       674
       -
               throw Exception(

     

       675
       -
                 'Failed to restore DPoP key from stored state: $e. '

     

       676
       -
                 'The stored key may be corrupted. Please try authenticating again.',

     

       677
       -
               );

     

       678
       -
             }

     

       679
       -
       

     

       680
       -
             final server = await serverFactory.fromIssuer(

     

       681
       -
               stateData.iss,

     

       682
       -
               authMethod,

     

       683
       -
               dpopKey,

     

       684
       -
               auth_resolver.GetCachedOptions(cancelToken: cancelToken),

     

       685
       -
             );

     

       686
       -
       

     

       687
       -
             // Validate issuer if provided

     

       688
       -
             if (issuerParam != null) {

     

       689
       -
               if (server.issuer.isEmpty) {

     

       690
       -
                 throw OAuthCallbackError(

     

       691
       -
                   params,

     

       692
       -
                   message: 'Issuer not found in metadata',

     

       693
       -
                   state: stateData.appState,

     

       694
       -
                 );

     

       695
       -
               }

     

       696
       -
               if (server.issuer != issuerParam) {

     

       697
       -
                 throw OAuthCallbackError(

     

       698
       -
                   params,

     

       699
       -
                   message: 'Issuer mismatch',

     

       700
       -
                   state: stateData.appState,

     

       701
       -
                 );

     

       702
       -
               }

     

       703
       -
             } else if (server

     

       704
       -
                     .serverMetadata['authorization_response_iss_parameter_supported'] ==

     

       705
       -
                 true) {

     

       706
       -
               throw OAuthCallbackError(

     

       707
       -
                 params,

     

       708
       -
                 message: 'iss missing from the response',

     

       709
       -
                 state: stateData.appState,

     

       710
       -
               );

     

       711
       -
             }

     

       712
       -
       

     

       713
       -
             // Exchange authorization code for tokens

     

       714
       -
             // CRITICAL: Use the EXACT same redirectUri that was used during authorization

     

       715
       -
             // The redirectUri in the token exchange MUST match the one in the PAR request

     

       716
       -
             final redirectUriForExchange =

     

       717
       -
                 stateData.redirectUri ??

     

       718
       -
                 opts.redirectUri ??

     

       719
       -
                 clientMetadata.redirectUris.first;

     

       720
       -
       

     

       721
       -
             if (kDebugMode) {

     

       722
       -
               print('🔄 Exchanging authorization code for tokens:');

     

       723
       -
               print('   Code: ${codeParam.substring(0, 20)}...');

     

       724
       -
               print(

     

       725
       -
                 '   Code verifier: ${stateData.verifier?.substring(0, 20) ?? "none"}...',

     

       726
       -
               );

     

       727
       -
               print('   Redirect URI: $redirectUriForExchange');

     

       728
       -
               print(

     

       729
       -
                 '   Redirect URI source: ${stateData.redirectUri != null ? "stored" : "fallback"}',

     

       730
       -
               );

     

       731
       -
               print('   Issuer: ${server.issuer}');

     

       732
       -
             }

     

       733
       -
       

     

       734
       -
             final tokenSet = await server.exchangeCode(

     

       735
       -
               codeParam,

     

       736
       -
               codeVerifier: stateData.verifier,

     

       737
       -
               redirectUri: redirectUriForExchange,

     

       738
       -
             );

     

       739
       -
       

     

       740
       -
             try {

     

       741
       -
               if (kDebugMode) {

     

       742
       -
                 print('💾 Storing session for: ${tokenSet.sub}');

     

       743
       -
               }

     

       744
       -
       

     

       745
       -
               // Store session

     

       746
       -
               await _sessionGetter.setStored(

     

       747
       -
                 tokenSet.sub,

     

       748
       -
                 Session(

     

       749
       -
                   dpopKey: stateData.dpopKey,

     

       750
       -
                   authMethod: authMethod.toJson(),

     

       751
       -
                   tokenSet: tokenSet,

     

       752
       -
                 ),

     

       753
       -
               );

     

       754
       -
       

     

       755
       -
               if (kDebugMode) {

     

       756
       -
                 print('✅ Session stored successfully');

     

       757
       -
                 print('🎯 Creating session wrapper...');

     

       758
       -
               }

     

       759
       -
       

     

       760
       -
               // Create session wrapper

     

       761
       -
               final session = _createSession(server, tokenSet.sub);

     

       762
       -
       

     

       763
       -
               if (kDebugMode) {

     

       764
       -
                 print('✅ Session wrapper created');

     

       765
       -
                 print('🎉 OAuth callback complete!');

     

       766
       -
               }

     

       767
       -
       

     

       768
       -
               return CallbackResult(session: session, state: stateData.appState);

     

       769
       -
             } catch (err, stackTrace) {

     

       770
       -
               // If session storage failed, revoke the tokens

     

       771
       -
               if (kDebugMode) {

     

       772
       -
                 print('❌ Session storage/creation failed:');

     

       773
       -
                 print('   Error: $err');

     

       774
       -
                 print('   Stack trace: $stackTrace');

     

       775
       -
               }

     

       776
       -
               await server.revoke(tokenSet.refreshToken ?? tokenSet.accessToken);

     

       777
       -
               rethrow;

     

       778
       -
             }

     

       779
       -
           } catch (err, stackTrace) {

     

       780
       -
             // Ensure appState is available in error

     

       781
       -
             if (kDebugMode) {

     

       782
       -
               print('❌ Callback error (outer catch):');

     

       783
       -
               print('   Error type: ${err.runtimeType}');

     

       784
       -
               print('   Error: $err');

     

       785
       -
               print('   Stack trace: $stackTrace');

     

       786
       -
             }

     

       787
       -
             throw OAuthCallbackError.from(err, params, stateData.appState);

     

       788
       -
           }

     

       789
       -
         }

     

       790
       -
       

     

       791
       -
         /// Restores a stored session.

     

       792
       -
         ///

     

       793
       -
         /// This method:

     

       794
       -
         /// 1. Retrieves session from storage

     

       795
       -
         /// 2. Checks if tokens are expired

     

       796
       -
         /// 3. Automatically refreshes tokens if needed (based on [refresh])

     

       797
       -
         /// 4. Creates OAuthServerAgent

     

       798
       -
         /// 5. Returns live OAuthSession

     

       799
       -
         ///

     

       800
       -
         /// The [sub] is the user's DID.

     

       801
       -
         ///

     

       802
       -
         /// The [refresh] parameter controls token refresh:

     

       803
       -
         /// - `true`: Force refresh even if not expired

     

       804
       -
         /// - `false`: Use cached tokens even if expired

     

       805
       -
         /// - `'auto'`: Refresh only if expired (default)

     

       806
       -
         ///

     

       807
       -
         /// Throws [Exception] if session doesn't exist.

     

       808
       -
         /// Throws [TokenRefreshError] if refresh fails.

     

       809
       -
         /// Throws [AuthMethodUnsatisfiableError] if auth method can't be satisfied.

     

       810
       -
         Future<OAuthSession> restore(

     

       811
       -
           String sub, {

     

       812
       -
           dynamic refresh = 'auto',

     

       813
       -
           CancelToken? cancelToken,

     

       814
       -
         }) async {

     

       815
       -
           // Validate DID format

     

       816
       -
           assertAtprotoDid(sub);

     

       817
       -
       

     

       818
       -
           // Get session (automatically refreshes if needed based on refresh param)

     

       819
       -
           final session = await _sessionGetter.getSession(sub, refresh);

     

       820
       -
       

     

       821
       -
           try {

     

       822
       -
             // Determine auth method (with legacy fallback)

     

       823
       -
             final authMethod =

     

       824
       -
                 session.authMethod != null

     

       825
       -
                     ? ClientAuthMethod.fromJson(

     

       826
       -
                       session.authMethod as Map<String, dynamic>,

     

       827
       -
                     )

     

       828
       -
                     : const ClientAuthMethod.none(); // Legacy

     

       829
       -
       

     

       830
       -
             // Restore dpopKey from stored private JWK with error handling

     

       831
       -
             // CRITICAL FIX: Use the stored key instead of generating a new one

     

       832
       -
             // This ensures DPoP proofs match the token binding

     

       833
       -
             final FlutterKey dpopKey;

     

       834
       -
             try {

     

       835
       -
               dpopKey = FlutterKey.fromJwk(session.dpopKey as Map<String, dynamic>);

     

       836
       -
             } catch (e) {

     

       837
       -
               // If key is corrupted, delete the session and force re-authentication

     

       838
       -
               await _sessionGetter.delStored(

     

       839
       -
                 sub,

     

       840
       -
                 Exception('Corrupted DPoP key in stored session: $e'),

     

       841
       -
               );

     

       842
       -
               throw Exception(

     

       843
       -
                 'Failed to restore DPoP key for session. The stored key is corrupted. '

     

       844
       -
                 'Please authenticate again.',

     

       845
       -
               );

     

       846
       -
             }

     

       847
       -
       

     

       848
       -
             // Create server agent

     

       849
       -
             final server = await serverFactory.fromIssuer(

     

       850
       -
               session.tokenSet.iss,

     

       851
       -
               authMethod,

     

       852
       -
               dpopKey,

     

       853
       -
               auth_resolver.GetCachedOptions(

     

       854
       -
                 noCache: refresh == true,

     

       855
       -
                 allowStale: refresh == false,

     

       856
       -
                 cancelToken: cancelToken,

     

       857
       -
               ),

     

       858
       -
             );

     

       859
       -
       

     

       860
       -
             return _createSession(server, sub);

     

       861
       -
           } catch (err) {

     

       862
       -
             // If auth method can't be satisfied, delete the session

     

       863
       -
             if (err is AuthMethodUnsatisfiableError) {

     

       864
       -
               await _sessionGetter.delStored(sub, err);

     

       865
       -
             }

     

       866
       -
             rethrow;

     

       867
       -
           }

     

       868
       -
         }

     

       869
       -
       

     

       870
       -
         /// Revokes a session.

     

       871
       -
         ///

     

       872
       -
         /// This method:

     

       873
       -
         /// 1. Retrieves session from storage

     

       874
       -
         /// 2. Calls token revocation endpoint

     

       875
       -
         /// 3. Deletes session from storage

     

       876
       -
         ///

     

       877
       -
         /// The [sub] is the user's DID.

     

       878
       -
         ///

     

       879
       -
         /// Token revocation is best-effort - even if the revocation request fails,

     

       880
       -
         /// the local session is still deleted.

     

       881
       -
         Future<void> revoke(String sub, {CancelToken? cancelToken}) async {

     

       882
       -
           // Validate DID format

     

       883
       -
           assertAtprotoDid(sub);

     

       884
       -
       

     

       885
       -
           // Get session (allow stale tokens for revocation)

     

       886
       -
           final session = await _sessionGetter.get(

     

       887
       -
             sub,

     

       888
       -
             const GetCachedOptions(allowStale: true),

     

       889
       -
           );

     

       890
       -
       

     

       891
       -
           // Try to revoke tokens on the server

     

       892
       -
           try {

     

       893
       -
             final authMethod =

     

       894
       -
                 session.authMethod != null

     

       895
       -
                     ? ClientAuthMethod.fromJson(

     

       896
       -
                       session.authMethod as Map<String, dynamic>,

     

       897
       -
                     )

     

       898
       -
                     : const ClientAuthMethod.none(); // Legacy

     

       899
       -
       

     

       900
       -
             // Restore dpopKey from stored private JWK with error handling

     

       901
       -
             // CRITICAL FIX: Use the stored key instead of generating a new one

     

       902
       -
             // This ensures DPoP proofs match the token binding

     

       903
       -
             final FlutterKey dpopKey;

     

       904
       -
             try {

     

       905
       -
               dpopKey = FlutterKey.fromJwk(session.dpopKey as Map<String, dynamic>);

     

       906
       -
             } catch (e) {

     

       907
       -
               // If key is corrupted, skip server-side revocation

     

       908
       -
               // The finally block will still delete the local session

     

       909
       -
               if (kDebugMode) {

     

       910
       -
                 print('⚠️  Cannot revoke on server: corrupted DPoP key ($e)');

     

       911
       -
                 print('   Local session will still be deleted');

     

       912
       -
               }

     

       913
       -
               return;

     

       914
       -
             }

     

       915
       -
       

     

       916
       -
             final server = await serverFactory.fromIssuer(

     

       917
       -
               session.tokenSet.iss,

     

       918
       -
               authMethod,

     

       919
       -
               dpopKey,

     

       920
       -
               auth_resolver.GetCachedOptions(cancelToken: cancelToken),

     

       921
       -
             );

     

       922
       -
       

     

       923
       -
             await server.revoke(session.tokenSet.accessToken);

     

       924
       -
           } finally {

     

       925
       -
             // Always delete local session, even if revocation failed

     

       926
       -
             await _sessionGetter.delStored(sub, TokenRevokedError(sub));

     

       927
       -
           }

     

       928
       -
         }

     

       929
       -
       

     

       930
       -
         /// Creates an OAuthSession wrapper.

     

       931
       -
         ///

     

       932
       -
         /// Internal helper for creating session objects from server agents.

     

       933
       -
         OAuthSession _createSession(OAuthServerAgent server, String sub) {

     

       934
       -
           // Create a wrapper that implements SessionGetterInterface

     

       935
       -
           final sessionGetterWrapper = _SessionGetterWrapper(_sessionGetter);

     

       936
       -
       

     

       937
       -
           return OAuthSession(

     

       938
       -
             server: server,

     

       939
       -
             sub: sub,

     

       940
       -
             sessionGetter: sessionGetterWrapper,

     

       941
       -
           );

     

       942
       -
         }

     

       943
       -
       

     

       944
       -
         /// Disposes of resources used by this client.

     

       945
       -
         ///

     

       946
       -
         /// Call this when the client is no longer needed to prevent memory leaks.

     

       947
       -
         @override

     

       948
       -
         void dispose() {

     

       949
       -
           _updatedController.close();

     

       950
       -
           _deletedController.close();

     

       951
       -
           _sessionGetter.dispose();

     

       952
       -
           super.dispose();

     

       953
       -
         }

     

       954
       -
       }

     

       955
       -
       

     

       956
       -
       /// Wrapper to adapt SessionGetter to SessionGetterInterface

     

       957
       -
       class _SessionGetterWrapper implements SessionGetterInterface {

     

       958
       -
         final SessionGetter _getter;

     

       959
       -
       

     

       960
       -
         _SessionGetterWrapper(this._getter);

     

       961
       -
       

     

       962
       -
         @override

     

       963
       -
         Future<Session> get(String sub, {bool? noCache, bool? allowStale}) async {

     

       964
       -
           return _getter.get(

     

       965
       -
             sub,

     

       966
       -
             GetCachedOptions(

     

       967
       -
               noCache: noCache ?? false,

     

       968
       -
               allowStale: allowStale ?? false,

     

       969
       -
             ),

     

       970
       -
           );

     

       971
       -
         }

     

       972
       -
       

     

       973
       -
         @override

     

       974
       -
         Future<void> delStored(String sub, [Object? cause]) {

     

       975
       -
           return _getter.delStored(sub, cause);

     

       976
       -
         }

     

       977
       -
       }

-2

packages/atproto_oauth_flutter/lib/src/constants.dart

···

       1
       -
       /// Per ATProto spec (OpenID uses RS256)

     

       2
       -
       const String fallbackAlg = 'ES256';

-593

packages/atproto_oauth_flutter/lib/src/dpop/fetch_dpop.dart

···

       1
       -
       import 'dart:async';

     

       2
       -
       import 'dart:convert';

     

       3
       -
       

     

       4
       -
       import 'package:dio/dio.dart';

     

       5
       -
       import 'package:flutter/foundation.dart' hide Key;

     

       6
       -
       

     

       7
       -
       import '../runtime/runtime_implementation.dart';

     

       8
       -
       

     

       9
       -
       /// A simple key-value store interface for storing DPoP nonces.

     

       10
       -
       ///

     

       11
       -
       /// This is a simplified Dart version of @atproto-labs/simple-store.

     

       12
       -
       /// Implementations can use:

     

       13
       -
       /// - In-memory Map (for testing)

     

       14
       -
       /// - SharedPreferences (for persistence)

     

       15
       -
       /// - Secure storage (for sensitive data)

     

       16
       -
       abstract class SimpleStore<K, V> {

     

       17
       -
         /// Get a value by key. Returns null if not found.

     

       18
       -
         FutureOr<V?> get(K key);

     

       19
       -
       

     

       20
       -
         /// Set a value for a key.

     

       21
       -
         FutureOr<void> set(K key, V value);

     

       22
       -
       

     

       23
       -
         /// Delete a value by key.

     

       24
       -
         FutureOr<void> del(K key);

     

       25
       -
       

     

       26
       -
         /// Clear all values (optional).

     

       27
       -
         FutureOr<void> clear();

     

       28
       -
       }

     

       29
       -
       

     

       30
       -
       /// In-memory implementation of SimpleStore for DPoP nonces.

     

       31
       -
       ///

     

       32
       -
       /// This is used as the default nonce store. Nonces are ephemeral and

     

       33
       -
       /// don't need to be persisted across app restarts.

     

       34
       -
       class InMemoryStore<K, V> implements SimpleStore<K, V> {

     

       35
       -
         final Map<K, V> _store = {};

     

       36
       -
       

     

       37
       -
         @override

     

       38
       -
         V? get(K key) => _store[key];

     

       39
       -
       

     

       40
       -
         @override

     

       41
       -
         void set(K key, V value) => _store[key] = value;

     

       42
       -
       

     

       43
       -
         @override

     

       44
       -
         void del(K key) => _store.remove(key);

     

       45
       -
       

     

       46
       -
         @override

     

       47
       -
         void clear() => _store.clear();

     

       48
       -
       }

     

       49
       -
       

     

       50
       -
       /// Options for configuring the DPoP fetch wrapper.

     

       51
       -
       class DpopFetchWrapperOptions {

     

       52
       -
         /// The cryptographic key used to sign DPoP proofs.

     

       53
       -
         final Key key;

     

       54
       -
       

     

       55
       -
         /// Store for caching DPoP nonces per origin.

     

       56
       -
         final SimpleStore<String, String> nonces;

     

       57
       -
       

     

       58
       -
         /// List of algorithms supported by the server (optional).

     

       59
       -
         /// If not provided, the key's first algorithm will be used.

     

       60
       -
         final List<String>? supportedAlgs;

     

       61
       -
       

     

       62
       -
         /// Function to compute SHA-256 hash (required for DPoP).

     

       63
       -
         /// Should return base64url-encoded hash.

     

       64
       -
         final Future<String> Function(String input) sha256;

     

       65
       -
       

     

       66
       -
         /// Whether the target server is an authorization server (true)

     

       67
       -
         /// or resource server (false).

     

       68
       -
         ///

     

       69
       -
         /// This affects how "use_dpop_nonce" errors are detected:

     

       70
       -
         /// - Authorization servers return 400 with JSON error

     

       71
       -
         /// - Resource servers return 401 with WWW-Authenticate header

     

       72
       -
         ///

     

       73
       -
         /// If null, both patterns will be checked.

     

       74
       -
         final bool? isAuthServer;

     

       75
       -
       

     

       76
       -
         const DpopFetchWrapperOptions({

     

       77
       -
           required this.key,

     

       78
       -
           required this.nonces,

     

       79
       -
           this.supportedAlgs,

     

       80
       -
           required this.sha256,

     

       81
       -
           this.isAuthServer,

     

       82
       -
         });

     

       83
       -
       }

     

       84
       -
       

     

       85
       -
       /// Creates a Dio interceptor that adds DPoP (Demonstrating Proof of Possession)

     

       86
       -
       /// headers to HTTP requests.

     

       87
       -
       ///

     

       88
       -
       /// DPoP is a security mechanism that binds access tokens to cryptographic keys,

     

       89
       -
       /// preventing token theft and replay attacks. It works by:

     

       90
       -
       ///

     

       91
       -
       /// 1. Creating a JWT proof signed with a private key

     

       92
       -
       /// 2. Including the proof in a DPoP header

     

       93
       -
       /// 3. Including the access token hash (ath) in the proof

     

       94
       -
       /// 4. Handling nonce-based replay protection

     

       95
       -
       ///

     

       96
       -
       /// The interceptor automatically:

     

       97
       -
       /// - Generates DPoP proofs for each request

     

       98
       -
       /// - Caches and reuses server-provided nonces

     

       99
       -
       /// - Retries requests when server requires a fresh nonce

     

       100
       -
       /// - Handles both authorization and resource server error formats

     

       101
       -
       ///

     

       102
       -
       /// See: https://datatracker.ietf.org/doc/html/rfc9449

     

       103
       -
       ///

     

       104
       -
       /// Example:

     

       105
       -
       /// ```dart

     

       106
       -
       /// final dio = Dio();

     

       107
       -
       /// final options = DpopFetchWrapperOptions(

     

       108
       -
       ///   key: myKey,

     

       109
       -
       ///   nonces: InMemoryStore(),

     

       110
       -
       ///   sha256: runtime.sha256,

     

       111
       -
       /// );

     

       112
       -
       /// dio.interceptors.add(createDpopInterceptor(options));

     

       113
       -
       /// ```

     

       114
       -
       Interceptor createDpopInterceptor(DpopFetchWrapperOptions options) {

     

       115
       -
         // Negotiate algorithm once at creation time

     

       116
       -
         final alg = _negotiateAlg(options.key, options.supportedAlgs);

     

       117
       -
       

     

       118
       -
         return InterceptorsWrapper(

     

       119
       -
           onRequest: (requestOptions, handler) async {

     

       120
       -
             try {

     

       121
       -
               // Extract authorization header for ath calculation

     

       122
       -
               final authHeader = requestOptions.headers['Authorization'] as String?;

     

       123
       -
               final String? ath;

     

       124
       -
               if (authHeader != null && authHeader.startsWith('DPoP ')) {

     

       125
       -
                 ath = await options.sha256(authHeader.substring(5));

     

       126
       -
               } else {

     

       127
       -
                 ath = null;

     

       128
       -
               }

     

       129
       -
       

     

       130
       -
               final uri = requestOptions.uri;

     

       131
       -
               final origin =

     

       132
       -
                   '${uri.scheme}://${uri.host}${uri.hasPort ? ':${uri.port}' : ''}';

     

       133
       -
       

     

       134
       -
               final htm = requestOptions.method;

     

       135
       -
               final htu = _buildHtu(uri.toString());

     

       136
       -
       

     

       137
       -
               // Try to get cached nonce for this origin

     

       138
       -
               String? initNonce;

     

       139
       -
               try {

     

       140
       -
                 initNonce = await options.nonces.get(origin);

     

       141
       -
               } catch (_) {

     

       142
       -
                 // Ignore nonce retrieval errors

     

       143
       -
               }

     

       144
       -
       

     

       145
       -
               // Build and add DPoP proof

     

       146
       -
               final initProof = await _buildProof(

     

       147
       -
                 options.key,

     

       148
       -
                 alg,

     

       149
       -
                 htm,

     

       150
       -
                 htu,

     

       151
       -
                 initNonce,

     

       152
       -
                 ath,

     

       153
       -
               );

     

       154
       -
               requestOptions.headers['DPoP'] = initProof;

     

       155
       -
       

     

       156
       -
               handler.next(requestOptions);

     

       157
       -
             } catch (e) {

     

       158
       -
               handler.reject(

     

       159
       -
                 DioException(

     

       160
       -
                   requestOptions: requestOptions,

     

       161
       -
                   error: 'Failed to create DPoP proof: $e',

     

       162
       -
                   type: DioExceptionType.unknown,

     

       163
       -
                 ),

     

       164
       -
               );

     

       165
       -
             }

     

       166
       -
           },

     

       167
       -
           onResponse: (response, handler) async {

     

       168
       -
             try {

     

       169
       -
               final uri = response.requestOptions.uri;

     

       170
       -
       

     

       171
       -
               if (kDebugMode && uri.path.contains('/token')) {

     

       172
       -
                 print('🟢 DPoP interceptor onResponse triggered');

     

       173
       -
                 print('   URL: ${uri.path}');

     

       174
       -
                 print('   Status: ${response.statusCode}');

     

       175
       -
               }

     

       176
       -
       

     

       177
       -
               // Check for DPoP-Nonce header in response

     

       178
       -
               final nextNonce = response.headers.value('dpop-nonce');

     

       179
       -
       

     

       180
       -
               if (nextNonce != null) {

     

       181
       -
                 // Extract origin from request

     

       182
       -
                 final origin =

     

       183
       -
                     '${uri.scheme}://${uri.host}${uri.hasPort ? ':${uri.port}' : ''}';

     

       184
       -
       

     

       185
       -
                 // Store the fresh nonce for future requests

     

       186
       -
                 try {

     

       187
       -
                   await options.nonces.set(origin, nextNonce);

     

       188
       -
                   if (kDebugMode && uri.path.contains('/token')) {

     

       189
       -
                     print('   Cached nonce: ${nextNonce.substring(0, 20)}...');

     

       190
       -
                   }

     

       191
       -
                 } catch (_) {

     

       192
       -
                   // Ignore nonce storage errors

     

       193
       -
                 }

     

       194
       -
               } else if (kDebugMode && uri.path.contains('/token')) {

     

       195
       -
                 print('   No nonce in response');

     

       196
       -
               }

     

       197
       -
       

     

       198
       -
               // Check for nonce errors in successful responses (when validateStatus: true)

     

       199
       -
               // This handles the case where Dio returns 401 as a successful response

     

       200
       -
               if (nextNonce != null &&

     

       201
       -
                   await _isUseDpopNonceError(response, options.isAuthServer)) {

     

       202
       -
                 final isTokenEndpoint =

     

       203
       -
                     uri.path.contains('/token') || uri.path.endsWith('/token');

     

       204
       -
       

     

       205
       -
                 if (kDebugMode) {

     

       206
       -
                   print(

     

       207
       -
                     '⚠️ DPoP nonce error in response (status ${response.statusCode})',

     

       208
       -
                   );

     

       209
       -
                   print('   Is token endpoint: $isTokenEndpoint');

     

       210
       -
                 }

     

       211
       -
       

     

       212
       -
                 if (isTokenEndpoint) {

     

       213
       -
                   // Don't retry token endpoint - just pass through with nonce cached

     

       214
       -
                   if (kDebugMode) {

     

       215
       -
                     print(

     

       216
       -
                       '   NOT retrying token endpoint (nonce cached for next attempt)',

     

       217
       -
                     );

     

       218
       -
                   }

     

       219
       -
                   handler.next(response);

     

       220
       -
                   return;

     

       221
       -
                 }

     

       222
       -
       

     

       223
       -
                 // For non-token endpoints, retry is safe

     

       224
       -
                 if (kDebugMode) {

     

       225
       -
                   print('🔄 Retrying request with fresh nonce');

     

       226
       -
                 }

     

       227
       -
       

     

       228
       -
                 try {

     

       229
       -
                   final authHeader =

     

       230
       -
                       response.requestOptions.headers['Authorization'] as String?;

     

       231
       -
                   final String? ath;

     

       232
       -
                   if (authHeader != null && authHeader.startsWith('DPoP ')) {

     

       233
       -
                     ath = await options.sha256(authHeader.substring(5));

     

       234
       -
                   } else {

     

       235
       -
                     ath = null;

     

       236
       -
                   }

     

       237
       -
       

     

       238
       -
                   final htm = response.requestOptions.method;

     

       239
       -
                   final htu = _buildHtu(uri.toString());

     

       240
       -
       

     

       241
       -
                   final nextProof = await _buildProof(

     

       242
       -
                     options.key,

     

       243
       -
                     alg,

     

       244
       -
                     htm,

     

       245
       -
                     htu,

     

       246
       -
                     nextNonce,

     

       247
       -
                     ath,

     

       248
       -
                   );

     

       249
       -
       

     

       250
       -
                   // Clone request options and update DPoP header

     

       251
       -
                   // Note: We preserve validateStatus to match original request behavior

     

       252
       -
                   final retryOptions = Options(

     

       253
       -
                     method: response.requestOptions.method,

     

       254
       -
                     headers: {...response.requestOptions.headers, 'DPoP': nextProof},

     

       255
       -
                     validateStatus: response.requestOptions.validateStatus,

     

       256
       -
                   );

     

       257
       -
       

     

       258
       -
                   // DESIGN NOTE: We create a fresh Dio instance for retry to avoid

     

       259
       -
                   // re-triggering this interceptor (which would cause infinite loops).

     

       260
       -
                   // This means base options (timeouts, etc.) are not preserved, but

     

       261
       -
                   // this is acceptable for DPoP nonce retry scenarios which should be fast.

     

       262
       -
                   // If this becomes an issue, we could inject a Dio factory function.

     

       263
       -
                   final dio = Dio();

     

       264
       -
                   final retryResponse = await dio.requestUri(

     

       265
       -
                     uri,

     

       266
       -
                     options: retryOptions,

     

       267
       -
                     data: response.requestOptions.data,

     

       268
       -
                   );

     

       269
       -
       

     

       270
       -
                   handler.resolve(retryResponse);

     

       271
       -
                   return;

     

       272
       -
                 } catch (retryError) {

     

       273
       -
                   if (kDebugMode) {

     

       274
       -
                     print('❌ Retry failed: $retryError');

     

       275
       -
                   }

     

       276
       -
                   // If retry fails, return the original response

     

       277
       -
                   handler.next(response);

     

       278
       -
                   return;

     

       279
       -
                 }

     

       280
       -
               }

     

       281
       -
       

     

       282
       -
               handler.next(response);

     

       283
       -
             } catch (e) {

     

       284
       -
               handler.reject(

     

       285
       -
                 DioException(

     

       286
       -
                   requestOptions: response.requestOptions,

     

       287
       -
                   response: response,

     

       288
       -
                   error: 'Failed to process DPoP nonce: $e',

     

       289
       -
                   type: DioExceptionType.unknown,

     

       290
       -
                 ),

     

       291
       -
               );

     

       292
       -
             }

     

       293
       -
           },

     

       294
       -
           onError: (error, handler) async {

     

       295
       -
             final response = error.response;

     

       296
       -
             if (response == null) {

     

       297
       -
               handler.next(error);

     

       298
       -
               return;

     

       299
       -
             }

     

       300
       -
       

     

       301
       -
             final uri = response.requestOptions.uri;

     

       302
       -
       

     

       303
       -
             if (kDebugMode && uri.path.contains('/token')) {

     

       304
       -
               print('🔴 DPoP interceptor onError triggered');

     

       305
       -
               print('   URL: ${uri.path}');

     

       306
       -
               print('   Status: ${response.statusCode}');

     

       307
       -
               print(

     

       308
       -
                 '   Has validateStatus: ${response.requestOptions.validateStatus != null}',

     

       309
       -
               );

     

       310
       -
             }

     

       311
       -
       

     

       312
       -
             // Check for DPoP-Nonce in error response

     

       313
       -
             final nextNonce = response.headers.value('dpop-nonce');

     

       314
       -
       

     

       315
       -
             if (nextNonce != null) {

     

       316
       -
               // Extract origin

     

       317
       -
               final origin =

     

       318
       -
                   '${uri.scheme}://${uri.host}${uri.hasPort ? ':${uri.port}' : ''}';

     

       319
       -
       

     

       320
       -
               // Store the fresh nonce for future requests

     

       321
       -
               try {

     

       322
       -
                 await options.nonces.set(origin, nextNonce);

     

       323
       -
                 if (kDebugMode && uri.path.contains('/token')) {

     

       324
       -
                   print('   Cached nonce: ${nextNonce.substring(0, 20)}...');

     

       325
       -
                 }

     

       326
       -
               } catch (_) {

     

       327
       -
                 // Ignore nonce storage errors

     

       328
       -
               }

     

       329
       -
       

     

       330
       -
               // Check if this is a "use_dpop_nonce" error

     

       331
       -
               final isNonceError = await _isUseDpopNonceError(

     

       332
       -
                 response,

     

       333
       -
                 options.isAuthServer,

     

       334
       -
               );

     

       335
       -
       

     

       336
       -
               if (kDebugMode && uri.path.contains('/token')) {

     

       337
       -
                 print('   Is use_dpop_nonce error: $isNonceError');

     

       338
       -
               }

     

       339
       -
       

     

       340
       -
               if (isNonceError) {

     

       341
       -
                 // IMPORTANT: Do NOT retry for token endpoint!

     

       342
       -
                 // Retrying the token exchange can consume the authorization code,

     

       343
       -
                 // causing "Invalid code" errors on the retry.

     

       344
       -
                 //

     

       345
       -
                 // Instead, we rely on pre-fetching the nonce before critical operations

     

       346
       -
                 // (like authorization code exchange) to ensure we have a valid nonce

     

       347
       -
                 // from the start.

     

       348
       -
                 //

     

       349
       -
                 // We still cache the nonce for future requests, but we don't retry

     

       350
       -
                 // this particular request.

     

       351
       -
                 final isTokenEndpoint =

     

       352
       -
                     uri.path.contains('/token') || uri.path.endsWith('/token');

     

       353
       -
       

     

       354
       -
                 if (kDebugMode && isTokenEndpoint) {

     

       355
       -
                   print('⚠️ DPoP nonce error on token endpoint - NOT retrying');

     

       356
       -
                   print('   Cached fresh nonce for future requests');

     

       357
       -
                 }

     

       358
       -
       

     

       359
       -
                 if (isTokenEndpoint) {

     

       360
       -
                   // Don't retry - just pass through the error with the nonce cached

     

       361
       -
                   handler.next(error);

     

       362
       -
                   return;

     

       363
       -
                 }

     

       364
       -
       

     

       365
       -
                 // For non-token endpoints, retry is safe

     

       366
       -
                 if (kDebugMode) {

     

       367
       -
                   print('🔄 DPoP retry for non-token endpoint: ${uri.path}');

     

       368
       -
                 }

     

       369
       -
       

     

       370
       -
                 try {

     

       371
       -
                   final authHeader =

     

       372
       -
                       response.requestOptions.headers['Authorization'] as String?;

     

       373
       -
                   final String? ath;

     

       374
       -
                   if (authHeader != null && authHeader.startsWith('DPoP ')) {

     

       375
       -
                     ath = await options.sha256(authHeader.substring(5));

     

       376
       -
                   } else {

     

       377
       -
                     ath = null;

     

       378
       -
                   }

     

       379
       -
       

     

       380
       -
                   final htm = response.requestOptions.method;

     

       381
       -
                   final htu = _buildHtu(uri.toString());

     

       382
       -
       

     

       383
       -
                   final nextProof = await _buildProof(

     

       384
       -
                     options.key,

     

       385
       -
                     alg,

     

       386
       -
                     htm,

     

       387
       -
                     htu,

     

       388
       -
                     nextNonce,

     

       389
       -
                     ath,

     

       390
       -
                   );

     

       391
       -
       

     

       392
       -
                   // Clone request options and update DPoP header

     

       393
       -
                   // Note: We preserve validateStatus to match original request behavior

     

       394
       -
                   final retryOptions = Options(

     

       395
       -
                     method: response.requestOptions.method,

     

       396
       -
                     headers: {...response.requestOptions.headers, 'DPoP': nextProof},

     

       397
       -
                     validateStatus: response.requestOptions.validateStatus,

     

       398
       -
                   );

     

       399
       -
       

     

       400
       -
                   // DESIGN NOTE: We create a fresh Dio instance for retry to avoid

     

       401
       -
                   // re-triggering this interceptor (which would cause infinite loops).

     

       402
       -
                   // This means base options (timeouts, etc.) are not preserved, but

     

       403
       -
                   // this is acceptable for DPoP nonce retry scenarios which should be fast.

     

       404
       -
                   // If this becomes an issue, we could inject a Dio factory function.

     

       405
       -
                   final dio = Dio();

     

       406
       -
                   final retryResponse = await dio.requestUri(

     

       407
       -
                     uri,

     

       408
       -
                     options: retryOptions,

     

       409
       -
                     data: response.requestOptions.data,

     

       410
       -
                   );

     

       411
       -
       

     

       412
       -
                   handler.resolve(retryResponse);

     

       413
       -
                   return;

     

       414
       -
                 } catch (retryError) {

     

       415
       -
                   // If retry fails, return the retry error

     

       416
       -
                   if (retryError is DioException) {

     

       417
       -
                     handler.next(retryError);

     

       418
       -
                   } else {

     

       419
       -
                     handler.next(

     

       420
       -
                       DioException(

     

       421
       -
                         requestOptions: response.requestOptions,

     

       422
       -
                         error: retryError,

     

       423
       -
                         type: DioExceptionType.unknown,

     

       424
       -
                       ),

     

       425
       -
                     );

     

       426
       -
                   }

     

       427
       -
                   return;

     

       428
       -
                 }

     

       429
       -
               }

     

       430
       -
             }

     

       431
       -
       

     

       432
       -
             if (kDebugMode && uri.path.contains('/token')) {

     

       433
       -
               print('🔴 DPoP interceptor passing error through (no retry)');

     

       434
       -
             }

     

       435
       -
       

     

       436
       -
             handler.next(error);

     

       437
       -
           },

     

       438
       -
         );

     

       439
       -
       }

     

       440
       -
       

     

       441
       -
       /// Strips query string and fragment from URL.

     

       442
       -
       ///

     

       443
       -
       /// Per RFC 9449, the htu (HTTP URI) claim must not include query or fragment.

     

       444
       -
       ///

     

       445
       -
       /// See: https://www.rfc-editor.org/rfc/rfc9449.html#section-4.2-4.6

     

       446
       -
       String _buildHtu(String url) {

     

       447
       -
         final fragmentIndex = url.indexOf('#');

     

       448
       -
         final queryIndex = url.indexOf('?');

     

       449
       -
       

     

       450
       -
         final int end;

     

       451
       -
         if (fragmentIndex == -1) {

     

       452
       -
           end = queryIndex;

     

       453
       -
         } else if (queryIndex == -1) {

     

       454
       -
           end = fragmentIndex;

     

       455
       -
         } else {

     

       456
       -
           end = fragmentIndex < queryIndex ? fragmentIndex : queryIndex;

     

       457
       -
         }

     

       458
       -
       

     

       459
       -
         return end == -1 ? url : url.substring(0, end);

     

       460
       -
       }

     

       461
       -
       

     

       462
       -
       /// Builds a DPoP proof JWT.

     

       463
       -
       ///

     

       464
       -
       /// The proof is a JWT with:

     

       465
       -
       /// - Header: typ="dpop+jwt", alg, jwk (public key)

     

       466
       -
       /// - Payload: iat, jti, htm, htu, nonce?, ath?

     

       467
       -
       ///

     

       468
       -
       /// See: https://datatracker.ietf.org/doc/html/rfc9449#section-4.2

     

       469
       -
       Future<String> _buildProof(

     

       470
       -
         Key key,

     

       471
       -
         String alg,

     

       472
       -
         String htm,

     

       473
       -
         String htu,

     

       474
       -
         String? nonce,

     

       475
       -
         String? ath,

     

       476
       -
       ) async {

     

       477
       -
         final jwk = key.bareJwk;

     

       478
       -
         if (jwk == null) {

     

       479
       -
           throw StateError('Only asymmetric keys can be used for DPoP proofs');

     

       480
       -
         }

     

       481
       -
       

     

       482
       -
         final now = DateTime.now().millisecondsSinceEpoch ~/ 1000;

     

       483
       -
       

     

       484
       -
         // Create header

     

       485
       -
         final header = {'alg': alg, 'typ': 'dpop+jwt', 'jwk': jwk};

     

       486
       -
       

     

       487
       -
         // Create payload

     

       488
       -
         final payload = {

     

       489
       -
           'iat': now,

     

       490
       -
           // Random jti to prevent replay attacks

     

       491
       -
           // Any collision will cause server rejection, which is acceptable

     

       492
       -
           'jti': DateTime.now().microsecondsSinceEpoch.toString(),

     

       493
       -
           'htm': htm,

     

       494
       -
           'htu': htu,

     

       495
       -
           if (nonce != null) 'nonce': nonce,

     

       496
       -
           if (ath != null) 'ath': ath,

     

       497
       -
         };

     

       498
       -
       

     

       499
       -
         if (kDebugMode && htu.contains('/token')) {

     

       500
       -
           print('🔐 Creating DPoP proof for token request:');

     

       501
       -
           print('   htm: $htm');

     

       502
       -
           print('   htu: $htu');

     

       503
       -
           print('   nonce: ${nonce ?? "none"}');

     

       504
       -
           print('   ath: ${ath ?? "none"}');

     

       505
       -
           print('   jwk keys: ${jwk?.keys.toList()}');

     

       506
       -
         }

     

       507
       -
       

     

       508
       -
         final jwt = await key.createJwt(header, payload);

     

       509
       -
       

     

       510
       -
         if (kDebugMode && htu.contains('/token')) {

     

       511
       -
           print('   ✅ DPoP proof created: ${jwt.substring(0, 50)}...');

     

       512
       -
         }

     

       513
       -
       

     

       514
       -
         return jwt;

     

       515
       -
       }

     

       516
       -
       

     

       517
       -
       /// Checks if a response indicates a "use_dpop_nonce" error.

     

       518
       -
       ///

     

       519
       -
       /// There are multiple error formats depending on server implementation:

     

       520
       -
       ///

     

       521
       -
       /// 1. Resource Server (RFC 6750): 401 with WWW-Authenticate header

     

       522
       -
       ///    WWW-Authenticate: DPoP error="use_dpop_nonce"

     

       523
       -
       ///

     

       524
       -
       /// 2. Authorization Server: 400 with JSON body

     

       525
       -
       ///    {"error": "use_dpop_nonce"}

     

       526
       -
       ///

     

       527
       -
       /// 3. Resource Server (JSON variant): 401 with JSON body

     

       528
       -
       ///    {"error": "use_dpop_nonce"}

     

       529
       -
       ///

     

       530
       -
       /// See:

     

       531
       -
       /// - https://datatracker.ietf.org/doc/html/rfc9449#name-resource-server-provided-no

     

       532
       -
       /// - https://datatracker.ietf.org/doc/html/rfc9449#name-authorization-server-provid

     

       533
       -
       Future<bool> _isUseDpopNonceError(Response response, bool? isAuthServer) async {

     

       534
       -
         // Check WWW-Authenticate header format (401 + header)

     

       535
       -
         if (response.statusCode == 401) {

     

       536
       -
           final wwwAuth = response.headers.value('www-authenticate');

     

       537
       -
           if (wwwAuth != null && wwwAuth.startsWith('DPoP')) {

     

       538
       -
             if (wwwAuth.contains('error="use_dpop_nonce"')) {

     

       539
       -
               return true;

     

       540
       -
             }

     

       541
       -
           }

     

       542
       -
         }

     

       543
       -
       

     

       544
       -
         // Check JSON body format (400 or 401 + JSON)

     

       545
       -
         // Some servers use 401 + JSON instead of WWW-Authenticate header

     

       546
       -
         if (response.statusCode == 400 || response.statusCode == 401) {

     

       547
       -
           try {

     

       548
       -
             final data = response.data;

     

       549
       -
             if (data is Map<String, dynamic>) {

     

       550
       -
               return data['error'] == 'use_dpop_nonce';

     

       551
       -
             } else if (data is String) {

     

       552
       -
               // Try to parse as JSON

     

       553
       -
               final json = jsonDecode(data);

     

       554
       -
               if (json is Map<String, dynamic>) {

     

       555
       -
                 return json['error'] == 'use_dpop_nonce';

     

       556
       -
               }

     

       557
       -
             }

     

       558
       -
           } catch (_) {

     

       559
       -
             // Invalid JSON or response too large, not a use_dpop_nonce error

     

       560
       -
             return false;

     

       561
       -
           }

     

       562
       -
         }

     

       563
       -
       

     

       564
       -
         return false;

     

       565
       -
       }

     

       566
       -
       

     

       567
       -
       /// Negotiates the algorithm to use for DPoP proofs.

     

       568
       -
       ///

     

       569
       -
       /// If supportedAlgs is provided, uses the first algorithm that the key supports.

     

       570
       -
       /// Otherwise, uses the key's first algorithm.

     

       571
       -
       ///

     

       572
       -
       /// Throws if the key doesn't support any of the server's algorithms.

     

       573
       -
       String _negotiateAlg(Key key, List<String>? supportedAlgs) {

     

       574
       -
         if (supportedAlgs != null) {

     

       575
       -
           // Use order of supportedAlgs as preference

     

       576
       -
           for (final alg in supportedAlgs) {

     

       577
       -
             if (key.algorithms.contains(alg)) {

     

       578
       -
               return alg;

     

       579
       -
             }

     

       580
       -
           }

     

       581
       -
           throw StateError(

     

       582
       -
             'Key does not match any algorithm supported by the server. '

     

       583
       -
             'Key supports: ${key.algorithms}, server supports: $supportedAlgs',

     

       584
       -
           );

     

       585
       -
         }

     

       586
       -
       

     

       587
       -
         // No server preference, use key's first algorithm

     

       588
       -
         if (key.algorithms.isEmpty) {

     

       589
       -
           throw StateError('Key does not support any algorithms');

     

       590
       -
         }

     

       591
       -
       

     

       592
       -
         return key.algorithms.first;

     

       593
       -
       }

-14

packages/atproto_oauth_flutter/lib/src/errors/auth_method_unsatisfiable_error.dart

···

       1
       -
       /// Exception thrown when the requested authentication method cannot be satisfied.

     

       2
       -
       class AuthMethodUnsatisfiableError implements Exception {

     

       3
       -
         final String? message;

     

       4
       -
       

     

       5
       -
         AuthMethodUnsatisfiableError([this.message]);

     

       6
       -
       

     

       7
       -
         @override

     

       8
       -
         String toString() {

     

       9
       -
           if (message != null) {

     

       10
       -
             return 'AuthMethodUnsatisfiableError: $message';

     

       11
       -
           }

     

       12
       -
           return 'AuthMethodUnsatisfiableError';

     

       13
       -
         }

     

       14
       -
       }

-10

packages/atproto_oauth_flutter/lib/src/errors/errors.dart

···

       1
       -
       /// OAuth error types for the atproto_oauth_flutter package.

     

       2
       -
       library;

     

       3
       -
       

     

       4
       -
       export 'auth_method_unsatisfiable_error.dart';

     

       5
       -
       export 'oauth_callback_error.dart';

     

       6
       -
       export 'oauth_resolver_error.dart';

     

       7
       -
       export 'oauth_response_error.dart';

     

       8
       -
       export 'token_invalid_error.dart';

     

       9
       -
       export 'token_refresh_error.dart';

     

       10
       -
       export 'token_revoked_error.dart';

-51

packages/atproto_oauth_flutter/lib/src/errors/oauth_callback_error.dart

···

       1
       -
       /// Error class for OAuth callback failures.

     

       2
       -
       ///

     

       3
       -
       /// This error is thrown when an OAuth authorization callback contains

     

       4
       -
       /// error parameters or fails to parse correctly.

     

       5
       -
       ///

     

       6
       -
       /// See: https://datatracker.ietf.org/doc/html/rfc6749#section-4.1.2.1

     

       7
       -
       class OAuthCallbackError implements Exception {

     

       8
       -
         /// The URL parameters from the callback

     

       9
       -
         final Map<String, String> params;

     

       10
       -
       

     

       11
       -
         /// The state parameter from the callback (if present)

     

       12
       -
         final String? state;

     

       13
       -
       

     

       14
       -
         /// The error message

     

       15
       -
         final String message;

     

       16
       -
       

     

       17
       -
         /// Optional underlying cause

     

       18
       -
         final Object? cause;

     

       19
       -
       

     

       20
       -
         /// Creates an OAuth callback error from parameters.

     

       21
       -
         ///

     

       22
       -
         /// The [params] should contain the parsed query parameters from the callback URL.

     

       23
       -
         /// The [message] defaults to the error_description from params, or a generic message.

     

       24
       -
         OAuthCallbackError(this.params, {String? message, this.state, this.cause})

     

       25
       -
           : message =

     

       26
       -
                 message ?? params['error_description'] ?? 'OAuth callback error';

     

       27
       -
       

     

       28
       -
         /// Creates an OAuthCallbackError from another error.

     

       29
       -
         ///

     

       30
       -
         /// If [err] is already an OAuthCallbackError, returns it unchanged.

     

       31
       -
         /// Otherwise, wraps the error with the given params and state.

     

       32
       -
         static OAuthCallbackError from(

     

       33
       -
           Object err,

     

       34
       -
           Map<String, String> params, [

     

       35
       -
           String? state,

     

       36
       -
         ]) {

     

       37
       -
           if (err is OAuthCallbackError) return err;

     

       38
       -
           final message = err is Exception ? err.toString() : null;

     

       39
       -
           return OAuthCallbackError(

     

       40
       -
             params,

     

       41
       -
             message: message,

     

       42
       -
             state: state,

     

       43
       -
             cause: err,

     

       44
       -
           );

     

       45
       -
         }

     

       46
       -
       

     

       47
       -
         @override

     

       48
       -
         String toString() {

     

       49
       -
           return 'OAuthCallbackError: $message';

     

       50
       -
         }

     

       51
       -
       }

-47

packages/atproto_oauth_flutter/lib/src/errors/oauth_resolver_error.dart

···

       1
       -
       /// Error class for OAuth resolution failures.

     

       2
       -
       ///

     

       3
       -
       /// This error is thrown when OAuth metadata resolution fails, including:

     

       4
       -
       /// - Authorization server metadata discovery

     

       5
       -
       /// - Protected resource metadata discovery

     

       6
       -
       /// - Identity resolution (handle → DID → PDS)

     

       7
       -
       class OAuthResolverError implements Exception {

     

       8
       -
         /// The error message

     

       9
       -
         final String message;

     

       10
       -
       

     

       11
       -
         /// Optional underlying cause

     

       12
       -
         final Object? cause;

     

       13
       -
       

     

       14
       -
         /// Creates an OAuth resolver error.

     

       15
       -
         OAuthResolverError(this.message, {this.cause});

     

       16
       -
       

     

       17
       -
         /// Creates an OAuthResolverError from another error.

     

       18
       -
         ///

     

       19
       -
         /// If [cause] is already an OAuthResolverError, returns it unchanged.

     

       20
       -
         /// Otherwise, wraps the error with an appropriate message.

     

       21
       -
         ///

     

       22
       -
         /// For validation errors, extracts the first error details.

     

       23
       -
         static OAuthResolverError from(Object cause, [String? message]) {

     

       24
       -
           if (cause is OAuthResolverError) return cause;

     

       25
       -
       

     

       26
       -
           String? validationReason;

     

       27
       -
       

     

       28
       -
           // Check if it's a validation error (would be FormatException or similar in Dart)

     

       29
       -
           if (cause is FormatException) {

     

       30
       -
             validationReason = cause.message;

     

       31
       -
           }

     

       32
       -
       

     

       33
       -
           final fullMessage =

     

       34
       -
               (message ?? 'Unable to resolve OAuth metadata') +

     

       35
       -
               (validationReason != null ? ' ($validationReason)' : '');

     

       36
       -
       

     

       37
       -
           return OAuthResolverError(fullMessage, cause: cause);

     

       38
       -
         }

     

       39
       -
       

     

       40
       -
         @override

     

       41
       -
         String toString() {

     

       42
       -
           if (cause != null) {

     

       43
       -
             return 'OAuthResolverError: $message (caused by: $cause)';

     

       44
       -
           }

     

       45
       -
           return 'OAuthResolverError: $message';

     

       46
       -
         }

     

       47
       -
       }

-62

packages/atproto_oauth_flutter/lib/src/errors/oauth_response_error.dart

···

       1
       -
       import 'package:dio/dio.dart';

     

       2
       -
       

     

       3
       -
       import '../util.dart';

     

       4
       -
       

     

       5
       -
       /// Error class for OAuth protocol errors returned by the server.

     

       6
       -
       ///

     

       7
       -
       /// OAuth servers return errors as JSON with standard fields:

     

       8
       -
       /// - error: The error code (required)

     

       9
       -
       /// - error_description: Human-readable description (optional)

     

       10
       -
       /// - error_uri: URI with more information (optional)

     

       11
       -
       ///

     

       12
       -
       /// See: https://datatracker.ietf.org/doc/html/rfc6749#section-5.2

     

       13
       -
       class OAuthResponseError implements Exception {

     

       14
       -
         /// The HTTP response that contained the error

     

       15
       -
         final Response response;

     

       16
       -
       

     

       17
       -
         /// The parsed response body (usually JSON)

     

       18
       -
         final dynamic payload;

     

       19
       -
       

     

       20
       -
         /// The OAuth error code (e.g., "invalid_request", "invalid_grant")

     

       21
       -
         final String? error;

     

       22
       -
       

     

       23
       -
         /// The human-readable error description

     

       24
       -
         final String? errorDescription;

     

       25
       -
       

     

       26
       -
         /// Creates an OAuth response error from a Dio response.

     

       27
       -
         ///

     

       28
       -
         /// Automatically extracts the error and error_description fields

     

       29
       -
         /// from the response payload if it's a JSON object.

     

       30
       -
         OAuthResponseError(this.response, this.payload)

     

       31
       -
           : error = _extractError(payload),

     

       32
       -
             errorDescription = _extractErrorDescription(payload);

     

       33
       -
       

     

       34
       -
         /// HTTP status code from the response

     

       35
       -
         int get status => response.statusCode ?? 0;

     

       36
       -
       

     

       37
       -
         /// HTTP headers from the response

     

       38
       -
         Headers get headers => response.headers;

     

       39
       -
       

     

       40
       -
         /// Extracts the error code from the payload

     

       41
       -
         static String? _extractError(dynamic payload) {

     

       42
       -
           if (payload is Map<String, dynamic>) {

     

       43
       -
             return ifString(payload['error']);

     

       44
       -
           }

     

       45
       -
           return null;

     

       46
       -
         }

     

       47
       -
       

     

       48
       -
         /// Extracts the error description from the payload

     

       49
       -
         static String? _extractErrorDescription(dynamic payload) {

     

       50
       -
           if (payload is Map<String, dynamic>) {

     

       51
       -
             return ifString(payload['error_description']);

     

       52
       -
           }

     

       53
       -
           return null;

     

       54
       -
         }

     

       55
       -
       

     

       56
       -
         @override

     

       57
       -
         String toString() {

     

       58
       -
           final errorCode = error ?? 'unknown';

     

       59
       -
           final description = errorDescription != null ? ': $errorDescription' : '';

     

       60
       -
           return 'OAuth "$errorCode" error$description';

     

       61
       -
         }

     

       62
       -
       }

-22

packages/atproto_oauth_flutter/lib/src/errors/token_invalid_error.dart

···

       1
       -
       /// Exception thrown when a token is invalid.

     

       2
       -
       class TokenInvalidError implements Exception {

     

       3
       -
         /// Subject identifier for the invalid token

     

       4
       -
         final String sub;

     

       5
       -
       

     

       6
       -
         /// Error message

     

       7
       -
         final String message;

     

       8
       -
       

     

       9
       -
         /// Optional cause of the error

     

       10
       -
         final Object? cause;

     

       11
       -
       

     

       12
       -
         TokenInvalidError(this.sub, {String? message, this.cause})

     

       13
       -
           : message = message ?? 'The session for "$sub" is invalid';

     

       14
       -
       

     

       15
       -
         @override

     

       16
       -
         String toString() {

     

       17
       -
           if (cause != null) {

     

       18
       -
             return 'TokenInvalidError: $message (caused by: $cause)';

     

       19
       -
           }

     

       20
       -
           return 'TokenInvalidError: $message';

     

       21
       -
         }

     

       22
       -
       }

-21

packages/atproto_oauth_flutter/lib/src/errors/token_refresh_error.dart

···

       1
       -
       /// Exception thrown when a token refresh operation fails.

     

       2
       -
       class TokenRefreshError implements Exception {

     

       3
       -
         /// Subject identifier for the token that failed to refresh

     

       4
       -
         final String sub;

     

       5
       -
       

     

       6
       -
         /// Error message

     

       7
       -
         final String message;

     

       8
       -
       

     

       9
       -
         /// Optional cause of the error

     

       10
       -
         final Object? cause;

     

       11
       -
       

     

       12
       -
         TokenRefreshError(this.sub, this.message, {this.cause});

     

       13
       -
       

     

       14
       -
         @override

     

       15
       -
         String toString() {

     

       16
       -
           if (cause != null) {

     

       17
       -
             return 'TokenRefreshError: $message (caused by: $cause)';

     

       18
       -
           }

     

       19
       -
           return 'TokenRefreshError: $message';

     

       20
       -
         }

     

       21
       -
       }

-22

packages/atproto_oauth_flutter/lib/src/errors/token_revoked_error.dart

···

       1
       -
       /// Exception thrown when a token has been successfully revoked.

     

       2
       -
       class TokenRevokedError implements Exception {

     

       3
       -
         /// Subject identifier for the revoked token

     

       4
       -
         final String sub;

     

       5
       -
       

     

       6
       -
         /// Error message

     

       7
       -
         final String message;

     

       8
       -
       

     

       9
       -
         /// Optional cause of the error

     

       10
       -
         final Object? cause;

     

       11
       -
       

     

       12
       -
         TokenRevokedError(this.sub, {String? message, this.cause})

     

       13
       -
           : message = message ?? 'The session for "$sub" was successfully revoked';

     

       14
       -
       

     

       15
       -
         @override

     

       16
       -
         String toString() {

     

       17
       -
           if (cause != null) {

     

       18
       -
             return 'TokenRevokedError: $message (caused by: $cause)';

     

       19
       -
           }

     

       20
       -
           return 'TokenRevokedError: $message';

     

       21
       -
         }

     

       22
       -
       }

-263

packages/atproto_oauth_flutter/lib/src/identity/README.md

···

       1
       -
       # atProto Identity Resolution Layer

     

       2
       -
       

     

       3
       -
       ## Overview

     

       4
       -
       

     

       5
       -
       This module implements the **critical identity resolution functionality** for atProto decentralization. It resolves atProto handles and DIDs to discover where user data is actually stored (their Personal Data Server).

     

       6
       -
       

     

       7
       -
       ## Why This Matters

     

       8
       -
       

     

       9
       -
       **This is the most important code for decentralization in atProto.**

     

       10
       -
       

     

       11
       -
       Without this layer:

     

       12
       -
       - Apps hardcode `bsky.social` as the only server

     

       13
       -
       - Users can't use custom domains

     

       14
       -
       - Self-hosting is impossible

     

       15
       -
       - atProto becomes centralized

     

       16
       -
       

     

       17
       -
       With this layer:

     

       18
       -
       - ✅ Users host data on any PDS they choose

     

       19
       -
       - ✅ Custom domain handles work (e.g., `alice.example.com`)

     

       20
       -
       - ✅ Identity is portable (change PDS without losing DID)

     

       21
       -
       - ✅ True decentralization is achieved

     

       22
       -
       

     

       23
       -
       ## Architecture

     

       24
       -
       

     

       25
       -
       ### Resolution Flow

     

       26
       -
       

     

       27
       -
       ```

     

       28
       -
       Handle/DID Input

     

       29
       -
           ↓

     

       30
       -
       Is it a DID? ──Yes──→ DID Resolution

     

       31
       -
           ↓                      ↓

     

       32
       -
           No                DID Document

     

       33
       -
           ↓                      ↓

     

       34
       -
       Handle Resolution    Extract Handle

     

       35
       -
           ↓                      ↓

     

       36
       -
           DID                Validate Handle ←→ DID

     

       37
       -
           ↓                      ↓

     

       38
       -
       DID Resolution        Return IdentityInfo

     

       39
       -
           ↓

     

       40
       -
       DID Document

     

       41
       -
           ↓

     

       42
       -
       Validate Handle in Doc

     

       43
       -
           ↓

     

       44
       -
       Extract PDS URL

     

       45
       -
           ↓

     

       46
       -
       Return IdentityInfo

     

       47
       -
       ```

     

       48
       -
       

     

       49
       -
       ### Key Components

     

       50
       -
       

     

       51
       -
       #### 1. IdentityResolver

     

       52
       -
       Main interface for resolving identities. Use `AtprotoIdentityResolver` for the standard implementation.

     

       53
       -
       

     

       54
       -
       ```dart

     

       55
       -
       final resolver = AtprotoIdentityResolver.withDefaults(

     

       56
       -
         handleResolverUrl: 'https://bsky.social',

     

       57
       -
       );

     

       58
       -
       

     

       59
       -
       // Resolve to PDS URL (most common use case)

     

       60
       -
       final pdsUrl = await resolver.resolveToPds('alice.example.com');

     

       61
       -
       

     

       62
       -
       // Get full identity info

     

       63
       -
       final info = await resolver.resolve('alice.example.com');

     

       64
       -
       print('DID: ${info.did}');

     

       65
       -
       print('Handle: ${info.handle}');

     

       66
       -
       print('PDS: ${info.pdsUrl}');

     

       67
       -
       ```

     

       68
       -
       

     

       69
       -
       #### 2. HandleResolver

     

       70
       -
       Resolves atProto handles (e.g., `alice.bsky.social`) to DIDs using XRPC.

     

       71
       -
       

     

       72
       -
       **Resolution Methods:**

     

       73
       -
       - XRPC: Uses `com.atproto.identity.resolveHandle` endpoint

     

       74
       -
       - DNS TXT record: Checks `_atproto.{handle}` (not implemented yet)

     

       75
       -
       - .well-known: Checks `https://{handle}/.well-known/atproto-did` (not implemented yet)

     

       76
       -
       

     

       77
       -
       Current implementation uses XRPC, which works for all handles.

     

       78
       -
       

     

       79
       -
       #### 3. DidResolver

     

       80
       -
       Resolves DIDs to DID documents.

     

       81
       -
       

     

       82
       -
       **Supported Methods:**

     

       83
       -
       - `did:plc`: Queries PLC directory (https://plc.directory)

     

       84
       -
       - `did:web`: Fetches from HTTPS URLs

     

       85
       -
       

     

       86
       -
       #### 4. DidDocument

     

       87
       -
       Represents a W3C DID document with atProto-specific helpers:

     

       88
       -
       - `extractPdsUrl()`: Gets the PDS endpoint

     

       89
       -
       - `extractNormalizedHandle()`: Gets the validated handle

     

       90
       -
       

     

       91
       -
       ### Bi-directional Resolution

     

       92
       -
       

     

       93
       -
       For security, we enforce **bi-directional resolution**:

     

       94
       -
       

     

       95
       -
       1. Handle → DID resolution must succeed

     

       96
       -
       2. DID document must contain the original handle

     

       97
       -
       3. Both directions must agree

     

       98
       -
       

     

       99
       -
       This prevents:

     

       100
       -
       - Handle hijacking

     

       101
       -
       - DID spoofing

     

       102
       -
       - MITM attacks

     

       103
       -
       

     

       104
       -
       ### Caching

     

       105
       -
       

     

       106
       -
       Built-in caching with configurable TTLs:

     

       107
       -
       - **Handles**: 1 hour default (handles can change)

     

       108
       -
       - **DIDs**: 24 hours default (DID docs are more stable)

     

       109
       -
       

     

       110
       -
       Caching is automatic but can be bypassed with `noCache: true`.

     

       111
       -
       

     

       112
       -
       ## File Structure

     

       113
       -
       

     

       114
       -
       ```

     

       115
       -
       identity/

     

       116
       -
       ├── constants.dart              # atProto constants

     

       117
       -
       ├── did_document.dart           # DID document representation

     

       118
       -
       ├── did_helpers.dart            # DID validation utilities

     

       119
       -
       ├── did_resolver.dart           # DID → DID document resolution

     

       120
       -
       ├── handle_helpers.dart         # Handle validation utilities

     

       121
       -
       ├── handle_resolver.dart        # Handle → DID resolution

     

       122
       -
       ├── identity_resolver.dart      # Main resolver (orchestrates everything)

     

       123
       -
       ├── identity_resolver_error.dart # Error types

     

       124
       -
       ├── identity.dart               # Public exports

     

       125
       -
       └── README.md                   # This file

     

       126
       -
       ```

     

       127
       -
       

     

       128
       -
       ## Usage Examples

     

       129
       -
       

     

       130
       -
       ### Basic Resolution

     

       131
       -
       

     

       132
       -
       ```dart

     

       133
       -
       import 'package:atproto_oauth_flutter/src/identity/identity.dart';

     

       134
       -
       

     

       135
       -
       final resolver = AtprotoIdentityResolver.withDefaults(

     

       136
       -
         handleResolverUrl: 'https://bsky.social',

     

       137
       -
       );

     

       138
       -
       

     

       139
       -
       // Simple PDS lookup

     

       140
       -
       final pdsUrl = await resolver.resolveToPds('alice.bsky.social');

     

       141
       -
       print('PDS: $pdsUrl');

     

       142
       -
       ```

     

       143
       -
       

     

       144
       -
       ### Custom Configuration

     

       145
       -
       

     

       146
       -
       ```dart

     

       147
       -
       // With custom caching and PLC directory

     

       148
       -
       final resolver = AtprotoIdentityResolver.withDefaults(

     

       149
       -
         handleResolverUrl: 'https://bsky.social',

     

       150
       -
         plcDirectoryUrl: 'https://plc.directory/',

     

       151
       -
         didCache: InMemoryDidCache(ttl: Duration(hours: 12)),

     

       152
       -
         handleCache: InMemoryHandleCache(ttl: Duration(minutes: 30)),

     

       153
       -
       );

     

       154
       -
       ```

     

       155
       -
       

     

       156
       -
       ### Manual Component Construction

     

       157
       -
       

     

       158
       -
       ```dart

     

       159
       -
       // Build your own resolver with custom components

     

       160
       -
       final dio = Dio();

     

       161
       -
       

     

       162
       -
       final didResolver = CachedDidResolver(

     

       163
       -
         AtprotoDidResolver(dio: dio),

     

       164
       -
       );

     

       165
       -
       

     

       166
       -
       final handleResolver = CachedHandleResolver(

     

       167
       -
         XrpcHandleResolver('https://bsky.social', dio: dio),

     

       168
       -
       );

     

       169
       -
       

     

       170
       -
       final resolver = AtprotoIdentityResolver(

     

       171
       -
         didResolver: didResolver,

     

       172
       -
         handleResolver: handleResolver,

     

       173
       -
       );

     

       174
       -
       ```

     

       175
       -
       

     

       176
       -
       ### Error Handling

     

       177
       -
       

     

       178
       -
       ```dart

     

       179
       -
       try {

     

       180
       -
         final info = await resolver.resolve('invalid-handle');

     

       181
       -
       } on InvalidHandleError catch (e) {

     

       182
       -
         print('Invalid handle format: $e');

     

       183
       -
       } on HandleResolverError catch (e) {

     

       184
       -
         print('Handle resolution failed: $e');

     

       185
       -
       } on DidResolverError catch (e) {

     

       186
       -
         print('DID resolution failed: $e');

     

       187
       -
       } on IdentityResolverError catch (e) {

     

       188
       -
         print('Identity resolution failed: $e');

     

       189
       -
       }

     

       190
       -
       ```

     

       191
       -
       

     

       192
       -
       ## Implementation Notes

     

       193
       -
       

     

       194
       -
       ### Ported from TypeScript

     

       195
       -
       

     

       196
       -
       This implementation is a 1:1 port from the official atProto TypeScript packages:

     

       197
       -
       - `@atproto-labs/identity-resolver`

     

       198
       -
       - `@atproto-labs/did-resolver`

     

       199
       -
       - `@atproto-labs/handle-resolver`

     

       200
       -
       

     

       201
       -
       Source: `/home/bretton/Code/atproto/packages/oauth/oauth-client/src/identity-resolver.ts`

     

       202
       -
       

     

       203
       -
       ### Differences from TypeScript

     

       204
       -
       

     

       205
       -
       1. **No DNS Resolution**: Dart doesn't have built-in DNS TXT lookups. We use XRPC only.

     

       206
       -
       2. **Simplified Caching**: In-memory only (TypeScript has more cache backends).

     

       207
       -
       3. **Dio instead of Fetch**: Using Dio HTTP client instead of global fetch.

     

       208
       -
       4. **Explicit Types**: Dart's type system is more explicit than TypeScript's.

     

       209
       -
       

     

       210
       -
       ### Future Improvements

     

       211
       -
       

     

       212
       -
       - [ ] Add DNS-over-HTTPS for handle resolution

     

       213
       -
       - [ ] Implement .well-known handle resolution

     

       214
       -
       - [ ] Add persistent cache backends (SQLite, Hive)

     

       215
       -
       - [ ] Support custom DID methods beyond plc/web

     

       216
       -
       - [ ] Add metrics and observability

     

       217
       -
       - [ ] Implement resolver timeouts and retries

     

       218
       -
       

     

       219
       -
       ## Testing

     

       220
       -
       

     

       221
       -
       Test the implementation with real handles:

     

       222
       -
       

     

       223
       -
       ```dart

     

       224
       -
       // Test custom PDS

     

       225
       -
       final pds1 = await resolver.resolveToPds('bretton.dev');

     

       226
       -
       assert(pds1.contains('pds.bretton.dev'));

     

       227
       -
       

     

       228
       -
       // Test Bluesky user

     

       229
       -
       final pds2 = await resolver.resolveToPds('pfrazee.com');

     

       230
       -
       print('Paul Frazee PDS: $pds2');

     

       231
       -
       

     

       232
       -
       // Test from DID

     

       233
       -
       final info = await resolver.resolveFromDid('did:plc:ragtjsm2j2vknwkz3zp4oxrd');

     

       234
       -
       assert(info.handle == 'pfrazee.com');

     

       235
       -
       ```

     

       236
       -
       

     

       237
       -
       ## Security Considerations

     

       238
       -
       

     

       239
       -
       1. **Bi-directional Validation**: Always enforced to prevent spoofing

     

       240
       -
       2. **HTTPS Only**: All HTTP requests use HTTPS (except localhost for testing)

     

       241
       -
       3. **No Redirects**: HTTP redirects are rejected to prevent attacks

     

       242
       -
       4. **Input Validation**: All handles and DIDs are validated before use

     

       243
       -
       5. **Cache Poisoning**: TTLs prevent stale data, noCache option available

     

       244
       -
       

     

       245
       -
       ## Performance

     

       246
       -
       

     

       247
       -
       Typical resolution times (with cold cache):

     

       248
       -
       - Handle → PDS: ~200-500ms (1 handle lookup + 1 DID fetch)

     

       249
       -
       - DID → PDS: ~100-200ms (1 DID fetch only)

     

       250
       -
       - Cached resolution: <1ms (in-memory lookup)

     

       251
       -
       

     

       252
       -
       For production apps:

     

       253
       -
       - Enable caching (default)

     

       254
       -
       - Use connection pooling (Dio does this)

     

       255
       -
       - Consider warming cache for known users

     

       256
       -
       - Monitor resolver errors and timeouts

     

       257
       -
       

     

       258
       -
       ## References

     

       259
       -
       

     

       260
       -
       - [atProto DID Spec](https://atproto.com/specs/did)

     

       261
       -
       - [atProto Handle Spec](https://atproto.com/specs/handle)

     

       262
       -
       - [W3C DID Core](https://www.w3.org/TR/did-core/)

     

       263
       -
       - [PLC Directory](https://plc.directory/)

-29

packages/atproto_oauth_flutter/lib/src/identity/constants.dart

···

       1
       -
       /// Constants used in atProto identity resolution.

     

       2
       -
       library;

     

       3
       -
       

     

       4
       -
       /// Placeholder handle used when handle is invalid or doesn't match DID.

     

       5
       -
       const String handleInvalid = 'handle.invalid';

     

       6
       -
       

     

       7
       -
       /// DID prefix for all decentralized identifiers.

     

       8
       -
       const String didPrefix = 'did:';

     

       9
       -
       

     

       10
       -
       /// DID PLC (Placeholder) prefix.

     

       11
       -
       const String didPlcPrefix = 'did:plc:';

     

       12
       -
       

     

       13
       -
       /// DID Web prefix.

     

       14
       -
       const String didWebPrefix = 'did:web:';

     

       15
       -
       

     

       16
       -
       /// Length of a complete did:plc identifier (including prefix).

     

       17
       -
       const int didPlcLength = 32;

     

       18
       -
       

     

       19
       -
       /// Default PLC directory URL for resolving did:plc identifiers.

     

       20
       -
       const String defaultPlcDirectoryUrl = 'https://plc.directory/';

     

       21
       -
       

     

       22
       -
       /// Maximum length for a DID (per spec).

     

       23
       -
       const int maxDidLength = 2048;

     

       24
       -
       

     

       25
       -
       /// atProto service type in DID documents.

     

       26
       -
       const String atprotoServiceType = 'AtprotoPersonalDataServer';

     

       27
       -
       

     

       28
       -
       /// atProto service ID prefix in DID documents.

     

       29
       -
       const String atprotoServiceId = '#atproto_pds';

-156

packages/atproto_oauth_flutter/lib/src/identity/did_document.dart

···

       1
       -
       import 'constants.dart';

     

       2
       -
       import 'handle_helpers.dart';

     

       3
       -
       

     

       4
       -
       /// Represents a DID document as defined by W3C DID Core spec.

     

       5
       -
       ///

     

       6
       -
       /// This is a simplified version focused on atProto needs.

     

       7
       -
       /// See: https://www.w3.org/TR/did-core/

     

       8
       -
       class DidDocument {

     

       9
       -
         /// The DID subject (the DID itself)

     

       10
       -
         final String id;

     

       11
       -
       

     

       12
       -
         /// Alternative identifiers (used for atProto handles: at://handle)

     

       13
       -
         final List<String>? alsoKnownAs;

     

       14
       -
       

     

       15
       -
         /// Service endpoints (used to find PDS URL)

     

       16
       -
         final List<DidService>? service;

     

       17
       -
       

     

       18
       -
         /// Verification methods for authentication

     

       19
       -
         final List<dynamic>? verificationMethod;

     

       20
       -
       

     

       21
       -
         /// Authentication methods

     

       22
       -
         final List<dynamic>? authentication;

     

       23
       -
       

     

       24
       -
         /// Optional controller DIDs

     

       25
       -
         final dynamic controller; // Can be String or List<String>

     

       26
       -
       

     

       27
       -
         /// The @context field

     

       28
       -
         final dynamic context;

     

       29
       -
       

     

       30
       -
         const DidDocument({

     

       31
       -
           required this.id,

     

       32
       -
           this.alsoKnownAs,

     

       33
       -
           this.service,

     

       34
       -
           this.verificationMethod,

     

       35
       -
           this.authentication,

     

       36
       -
           this.controller,

     

       37
       -
           this.context,

     

       38
       -
         });

     

       39
       -
       

     

       40
       -
         /// Parses a DID document from JSON.

     

       41
       -
         factory DidDocument.fromJson(Map<String, dynamic> json) {

     

       42
       -
           return DidDocument(

     

       43
       -
             id: json['id'] as String,

     

       44
       -
             alsoKnownAs:

     

       45
       -
                 (json['alsoKnownAs'] as List<dynamic>?)

     

       46
       -
                     ?.map((e) => e as String)

     

       47
       -
                     .toList(),

     

       48
       -
             service:

     

       49
       -
                 (json['service'] as List<dynamic>?)

     

       50
       -
                     ?.map((e) => DidService.fromJson(e as Map<String, dynamic>))

     

       51
       -
                     .toList(),

     

       52
       -
             verificationMethod: json['verificationMethod'] as List<dynamic>?,

     

       53
       -
             authentication: json['authentication'] as List<dynamic>?,

     

       54
       -
             controller: json['controller'],

     

       55
       -
             context: json['@context'],

     

       56
       -
           );

     

       57
       -
         }

     

       58
       -
       

     

       59
       -
         /// Converts the DID document to JSON.

     

       60
       -
         Map<String, dynamic> toJson() {

     

       61
       -
           final map = <String, dynamic>{'id': id};

     

       62
       -
       

     

       63
       -
           if (context != null) map['@context'] = context;

     

       64
       -
           if (alsoKnownAs != null) map['alsoKnownAs'] = alsoKnownAs;

     

       65
       -
           if (service != null) {

     

       66
       -
             map['service'] = service!.map((s) => s.toJson()).toList();

     

       67
       -
           }

     

       68
       -
           if (verificationMethod != null) {

     

       69
       -
             map['verificationMethod'] = verificationMethod;

     

       70
       -
           }

     

       71
       -
           if (authentication != null) map['authentication'] = authentication;

     

       72
       -
           if (controller != null) map['controller'] = controller;

     

       73
       -
       

     

       74
       -
           return map;

     

       75
       -
         }

     

       76
       -
       

     

       77
       -
         /// Extracts the atProto PDS URL from the DID document.

     

       78
       -
         ///

     

       79
       -
         /// Returns null if no PDS service is found.

     

       80
       -
         String? extractPdsUrl() {

     

       81
       -
           if (service == null) return null;

     

       82
       -
       

     

       83
       -
           for (final s in service!) {

     

       84
       -
             // Check for standard atproto_pds service

     

       85
       -
             if (s.id == atprotoServiceId && s.type == atprotoServiceType) {

     

       86
       -
               if (s.serviceEndpoint is String) {

     

       87
       -
                 return s.serviceEndpoint as String;

     

       88
       -
               }

     

       89
       -
             }

     

       90
       -
       

     

       91
       -
             // Also check if type matches (some implementations may vary on id)

     

       92
       -
             if (s.type == atprotoServiceType && s.serviceEndpoint is String) {

     

       93
       -
               return s.serviceEndpoint as String;

     

       94
       -
             }

     

       95
       -
           }

     

       96
       -
       

     

       97
       -
           return null;

     

       98
       -
         }

     

       99
       -
       

     

       100
       -
         /// Extracts the raw atProto handle from the DID document.

     

       101
       -
         ///

     

       102
       -
         /// Returns null if no handle is found in alsoKnownAs.

     

       103
       -
         String? extractAtprotoHandle() {

     

       104
       -
           if (alsoKnownAs == null) return null;

     

       105
       -
       

     

       106
       -
           for (final aka in alsoKnownAs!) {

     

       107
       -
             if (aka.startsWith('at://')) {

     

       108
       -
               // Strip off "at://" prefix

     

       109
       -
               return aka.substring(5);

     

       110
       -
             }

     

       111
       -
           }

     

       112
       -
       

     

       113
       -
           return null;

     

       114
       -
         }

     

       115
       -
       

     

       116
       -
         /// Extracts a validated, normalized atProto handle from the DID document.

     

       117
       -
         ///

     

       118
       -
         /// Returns null if no valid handle is found.

     

       119
       -
         String? extractNormalizedHandle() {

     

       120
       -
           final handle = extractAtprotoHandle();

     

       121
       -
           if (handle == null) return null;

     

       122
       -
           return asNormalizedHandle(handle);

     

       123
       -
         }

     

       124
       -
       }

     

       125
       -
       

     

       126
       -
       /// Represents a service endpoint in a DID document.

     

       127
       -
       class DidService {

     

       128
       -
         /// Service ID (e.g., "#atproto_pds")

     

       129
       -
         final String id;

     

       130
       -
       

     

       131
       -
         /// Service type (e.g., "AtprotoPersonalDataServer")

     

       132
       -
         final String type;

     

       133
       -
       

     

       134
       -
         /// Service endpoint URL

     

       135
       -
         final dynamic serviceEndpoint; // Can be String, Map, or List

     

       136
       -
       

     

       137
       -
         const DidService({

     

       138
       -
           required this.id,

     

       139
       -
           required this.type,

     

       140
       -
           required this.serviceEndpoint,

     

       141
       -
         });

     

       142
       -
       

     

       143
       -
         /// Parses a service from JSON.

     

       144
       -
         factory DidService.fromJson(Map<String, dynamic> json) {

     

       145
       -
           return DidService(

     

       146
       -
             id: json['id'] as String,

     

       147
       -
             type: json['type'] as String,

     

       148
       -
             serviceEndpoint: json['serviceEndpoint'],

     

       149
       -
           );

     

       150
       -
         }

     

       151
       -
       

     

       152
       -
         /// Converts the service to JSON.

     

       153
       -
         Map<String, dynamic> toJson() {

     

       154
       -
           return {'id': id, 'type': type, 'serviceEndpoint': serviceEndpoint};

     

       155
       -
         }

     

       156
       -
       }

-251

packages/atproto_oauth_flutter/lib/src/identity/did_helpers.dart

···

       1
       -
       import 'constants.dart';

     

       2
       -
       import 'identity_resolver_error.dart';

     

       3
       -
       

     

       4
       -
       /// Checks if a string is a valid DID.

     

       5
       -
       ///

     

       6
       -
       /// A valid DID follows the format: did:method:method-specific-id

     

       7
       -
       /// where method is lowercase alphanumeric and method-specific-id

     

       8
       -
       /// contains only allowed characters.

     

       9
       -
       bool isDid(String input) {

     

       10
       -
         try {

     

       11
       -
           assertDid(input);

     

       12
       -
           return true;

     

       13
       -
         } catch (e) {

     

       14
       -
           if (e is IdentityResolverError) {

     

       15
       -
             return false;

     

       16
       -
           }

     

       17
       -
           rethrow;

     

       18
       -
         }

     

       19
       -
       }

     

       20
       -
       

     

       21
       -
       /// Asserts that a string is a valid DID, throwing if not.

     

       22
       -
       void assertDid(String input) {

     

       23
       -
         if (input.length > maxDidLength) {

     

       24
       -
           throw InvalidDidError(input, 'DID is too long ($maxDidLength chars max)');

     

       25
       -
         }

     

       26
       -
       

     

       27
       -
         if (!input.startsWith(didPrefix)) {

     

       28
       -
           throw InvalidDidError(input, 'DID requires "$didPrefix" prefix');

     

       29
       -
         }

     

       30
       -
       

     

       31
       -
         final methodEndIndex = input.indexOf(':', didPrefix.length);

     

       32
       -
         if (methodEndIndex == -1) {

     

       33
       -
           throw InvalidDidError(input, 'Missing colon after method name');

     

       34
       -
         }

     

       35
       -
       

     

       36
       -
         _assertDidMethod(input, didPrefix.length, methodEndIndex);

     

       37
       -
         _assertDidMsid(input, methodEndIndex + 1, input.length);

     

       38
       -
       }

     

       39
       -
       

     

       40
       -
       /// Validates DID method name (lowercase alphanumeric).

     

       41
       -
       void _assertDidMethod(String input, int start, int end) {

     

       42
       -
         if (end == start) {

     

       43
       -
           throw InvalidDidError(input, 'Empty method name');

     

       44
       -
         }

     

       45
       -
       

     

       46
       -
         for (int i = start; i < end; i++) {

     

       47
       -
           final c = input.codeUnitAt(i);

     

       48
       -
           if (!((c >= 0x61 && c <= 0x7a) || (c >= 0x30 && c <= 0x39))) {

     

       49
       -
             // Not a-z or 0-9

     

       50
       -
             throw InvalidDidError(

     

       51
       -
               input,

     

       52
       -
               'Invalid character at position $i in DID method name',

     

       53
       -
             );

     

       54
       -
           }

     

       55
       -
         }

     

       56
       -
       }

     

       57
       -
       

     

       58
       -
       /// Validates DID method-specific identifier.

     

       59
       -
       void _assertDidMsid(String input, int start, int end) {

     

       60
       -
         if (end == start) {

     

       61
       -
           throw InvalidDidError(input, 'DID method-specific id must not be empty');

     

       62
       -
         }

     

       63
       -
       

     

       64
       -
         for (int i = start; i < end; i++) {

     

       65
       -
           final c = input.codeUnitAt(i);

     

       66
       -
       

     

       67
       -
           // Check for frequent chars first (a-z, A-Z, 0-9, ., -, _)

     

       68
       -
           if ((c >= 0x61 && c <= 0x7a) || // a-z

     

       69
       -
               (c >= 0x41 && c <= 0x5a) || // A-Z

     

       70
       -
               (c >= 0x30 && c <= 0x39) || // 0-9

     

       71
       -
               c == 0x2e || // .

     

       72
       -
               c == 0x2d || // -

     

       73
       -
               c == 0x5f) {

     

       74
       -
             // _

     

       75
       -
             continue;

     

       76
       -
           }

     

       77
       -
       

     

       78
       -
           // ":"

     

       79
       -
           if (c == 0x3a) {

     

       80
       -
             if (i == end - 1) {

     

       81
       -
               throw InvalidDidError(input, 'DID cannot end with ":"');

     

       82
       -
             }

     

       83
       -
             continue;

     

       84
       -
           }

     

       85
       -
       

     

       86
       -
           // pct-encoded: %HEXDIG HEXDIG

     

       87
       -
           if (c == 0x25) {

     

       88
       -
             // %

     

       89
       -
             if (i + 2 >= end) {

     

       90
       -
               throw InvalidDidError(

     

       91
       -
                 input,

     

       92
       -
                 'Incomplete pct-encoded character at position $i',

     

       93
       -
               );

     

       94
       -
             }

     

       95
       -
       

     

       96
       -
             i++;

     

       97
       -
             final c1 = input.codeUnitAt(i);

     

       98
       -
             if (!((c1 >= 0x30 && c1 <= 0x39) || (c1 >= 0x41 && c1 <= 0x46))) {

     

       99
       -
               // Not 0-9 or A-F

     

       100
       -
               throw InvalidDidError(

     

       101
       -
                 input,

     

       102
       -
                 'Invalid pct-encoded character at position $i',

     

       103
       -
               );

     

       104
       -
             }

     

       105
       -
       

     

       106
       -
             i++;

     

       107
       -
             final c2 = input.codeUnitAt(i);

     

       108
       -
             if (!((c2 >= 0x30 && c2 <= 0x39) || (c2 >= 0x41 && c2 <= 0x46))) {

     

       109
       -
               // Not 0-9 or A-F

     

       110
       -
               throw InvalidDidError(

     

       111
       -
                 input,

     

       112
       -
                 'Invalid pct-encoded character at position $i',

     

       113
       -
               );

     

       114
       -
             }

     

       115
       -
       

     

       116
       -
             continue;

     

       117
       -
           }

     

       118
       -
       

     

       119
       -
           throw InvalidDidError(input, 'Disallowed character in DID at position $i');

     

       120
       -
         }

     

       121
       -
       }

     

       122
       -
       

     

       123
       -
       /// Extracts the method name from a DID.

     

       124
       -
       ///

     

       125
       -
       /// Example: extractDidMethod('did:plc:abc123') returns 'plc'

     

       126
       -
       String extractDidMethod(String did) {

     

       127
       -
         final methodEndIndex = did.indexOf(':', didPrefix.length);

     

       128
       -
         return did.substring(didPrefix.length, methodEndIndex);

     

       129
       -
       }

     

       130
       -
       

     

       131
       -
       /// Checks if a string is a valid did:plc identifier.

     

       132
       -
       bool isDidPlc(String input) {

     

       133
       -
         if (input.length != didPlcLength) return false;

     

       134
       -
         if (!input.startsWith(didPlcPrefix)) return false;

     

       135
       -
       

     

       136
       -
         // Check that all characters after prefix are base32 [a-z2-7]

     

       137
       -
         for (int i = didPlcPrefix.length; i < didPlcLength; i++) {

     

       138
       -
           if (!_isBase32Char(input.codeUnitAt(i))) return false;

     

       139
       -
         }

     

       140
       -
       

     

       141
       -
         return true;

     

       142
       -
       }

     

       143
       -
       

     

       144
       -
       /// Checks if a string is a valid did:web identifier.

     

       145
       -
       bool isDidWeb(String input) {

     

       146
       -
         if (!input.startsWith(didWebPrefix)) return false;

     

       147
       -
         if (input.length <= didWebPrefix.length) return false;

     

       148
       -
       

     

       149
       -
         // Check if next char after prefix is ":"

     

       150
       -
         if (input.codeUnitAt(didWebPrefix.length) == 0x3a) return false;

     

       151
       -
       

     

       152
       -
         try {

     

       153
       -
           _assertDidMsid(input, didWebPrefix.length, input.length);

     

       154
       -
           return true;

     

       155
       -
         } catch (e) {

     

       156
       -
           return false;

     

       157
       -
         }

     

       158
       -
       }

     

       159
       -
       

     

       160
       -
       /// Checks if a DID uses an atProto-blessed method (plc or web).

     

       161
       -
       bool isAtprotoDid(String input) {

     

       162
       -
         return isDidPlc(input) || isDidWeb(input);

     

       163
       -
       }

     

       164
       -
       

     

       165
       -
       /// Asserts that a string is a valid atProto DID (did:plc or did:web).

     

       166
       -
       ///

     

       167
       -
       /// Throws [InvalidDidError] if the DID is not a valid atProto DID.

     

       168
       -
       void assertAtprotoDid(String input) {

     

       169
       -
         if (!isAtprotoDid(input)) {

     

       170
       -
           throw InvalidDidError(

     

       171
       -
             input,

     

       172
       -
             'DID must use atProto-blessed method (did:plc or did:web)',

     

       173
       -
           );

     

       174
       -
         }

     

       175
       -
       }

     

       176
       -
       

     

       177
       -
       /// Asserts that a string is a valid did:plc identifier.

     

       178
       -
       void assertDidPlc(String input) {

     

       179
       -
         if (!input.startsWith(didPlcPrefix)) {

     

       180
       -
           throw InvalidDidError(input, 'Invalid did:plc prefix');

     

       181
       -
         }

     

       182
       -
       

     

       183
       -
         if (input.length != didPlcLength) {

     

       184
       -
           throw InvalidDidError(

     

       185
       -
             input,

     

       186
       -
             'did:plc must be $didPlcLength characters long',

     

       187
       -
           );

     

       188
       -
         }

     

       189
       -
       

     

       190
       -
         for (int i = didPlcPrefix.length; i < didPlcLength; i++) {

     

       191
       -
           if (!_isBase32Char(input.codeUnitAt(i))) {

     

       192
       -
             throw InvalidDidError(input, 'Invalid character at position $i');

     

       193
       -
           }

     

       194
       -
         }

     

       195
       -
       }

     

       196
       -
       

     

       197
       -
       /// Asserts that a string is a valid did:web identifier.

     

       198
       -
       void assertDidWeb(String input) {

     

       199
       -
         if (!input.startsWith(didWebPrefix)) {

     

       200
       -
           throw InvalidDidError(input, 'Invalid did:web prefix');

     

       201
       -
         }

     

       202
       -
       

     

       203
       -
         if (input.codeUnitAt(didWebPrefix.length) == 0x3a) {

     

       204
       -
           throw InvalidDidError(input, 'did:web MSID must not start with a colon');

     

       205
       -
         }

     

       206
       -
       

     

       207
       -
         _assertDidMsid(input, didWebPrefix.length, input.length);

     

       208
       -
       }

     

       209
       -
       

     

       210
       -
       /// Checks if a character code is a base32 character [a-z2-7].

     

       211
       -
       bool _isBase32Char(int c) =>

     

       212
       -
           (c >= 0x61 && c <= 0x7a) || (c >= 0x32 && c <= 0x37);

     

       213
       -
       

     

       214
       -
       /// Converts a did:web to an HTTPS URL.

     

       215
       -
       ///

     

       216
       -
       /// Example:

     

       217
       -
       /// - did:web:example.com -> https://example.com

     

       218
       -
       /// - did:web:example.com:user:alice -> https://example.com/user/alice

     

       219
       -
       /// - did:web:localhost%3A3000 -> http://localhost:3000

     

       220
       -
       Uri didWebToUrl(String did) {

     

       221
       -
         assertDidWeb(did);

     

       222
       -
       

     

       223
       -
         final hostIdx = didWebPrefix.length;

     

       224
       -
         final pathIdx = did.indexOf(':', hostIdx);

     

       225
       -
       

     

       226
       -
         final hostEnc =

     

       227
       -
             pathIdx == -1 ? did.substring(hostIdx) : did.substring(hostIdx, pathIdx);

     

       228
       -
         final host = hostEnc.replaceAll('%3A', ':');

     

       229
       -
         final path = pathIdx == -1 ? '' : did.substring(pathIdx).replaceAll(':', '/');

     

       230
       -
       

     

       231
       -
         // Use http for localhost, https for everything else

     

       232
       -
         final proto =

     

       233
       -
             host.startsWith('localhost') &&

     

       234
       -
                     (host.length == 9 || host.codeUnitAt(9) == 0x3a) // ':'

     

       235
       -
                 ? 'http'

     

       236
       -
                 : 'https';

     

       237
       -
       

     

       238
       -
         return Uri.parse('$proto://$host$path');

     

       239
       -
       }

     

       240
       -
       

     

       241
       -
       /// Converts an HTTPS URL to a did:web identifier.

     

       242
       -
       ///

     

       243
       -
       /// Example:

     

       244
       -
       /// - https://example.com -> did:web:example.com

     

       245
       -
       /// - https://example.com/user/alice -> did:web:example.com:user:alice

     

       246
       -
       String urlToDidWeb(Uri url) {

     

       247
       -
         final port = url.hasPort ? '%3A${url.port}' : '';

     

       248
       -
         final path = url.path == '/' ? '' : url.path.replaceAll('/', ':');

     

       249
       -
       

     

       250
       -
         return '$didWebPrefix${url.host}$port$path';

     

       251
       -
       }

-257

packages/atproto_oauth_flutter/lib/src/identity/did_resolver.dart

···

       1
       -
       import 'package:dio/dio.dart';

     

       2
       -
       

     

       3
       -
       import 'constants.dart';

     

       4
       -
       import 'did_document.dart';

     

       5
       -
       import 'did_helpers.dart';

     

       6
       -
       import 'identity_resolver_error.dart';

     

       7
       -
       

     

       8
       -
       /// Options for DID resolution.

     

       9
       -
       class ResolveDidOptions {

     

       10
       -
         /// Whether to bypass cache

     

       11
       -
         final bool noCache;

     

       12
       -
       

     

       13
       -
         /// Cancellation token for the request

     

       14
       -
         final CancelToken? cancelToken;

     

       15
       -
       

     

       16
       -
         const ResolveDidOptions({this.noCache = false, this.cancelToken});

     

       17
       -
       }

     

       18
       -
       

     

       19
       -
       /// Interface for resolving DIDs to DID documents.

     

       20
       -
       abstract class DidResolver {

     

       21
       -
         /// Resolves a DID to its DID document.

     

       22
       -
         ///

     

       23
       -
         /// Throws [DidResolverError] if resolution fails.

     

       24
       -
         Future<DidDocument> resolve(String did, [ResolveDidOptions? options]);

     

       25
       -
       }

     

       26
       -
       

     

       27
       -
       /// DID resolver that supports both did:plc and did:web methods.

     

       28
       -
       class AtprotoDidResolver implements DidResolver {

     

       29
       -
         final DidPlcMethod _plcMethod;

     

       30
       -
         final DidWebMethod _webMethod;

     

       31
       -
       

     

       32
       -
         AtprotoDidResolver({String? plcDirectoryUrl, Dio? dio})

     

       33
       -
           : _plcMethod = DidPlcMethod(plcDirectoryUrl: plcDirectoryUrl, dio: dio),

     

       34
       -
             _webMethod = DidWebMethod(dio: dio);

     

       35
       -
       

     

       36
       -
         @override

     

       37
       -
         Future<DidDocument> resolve(String did, [ResolveDidOptions? options]) async {

     

       38
       -
           if (isDidPlc(did)) {

     

       39
       -
             return _plcMethod.resolve(did, options);

     

       40
       -
           } else if (isDidWeb(did)) {

     

       41
       -
             return _webMethod.resolve(did, options);

     

       42
       -
           } else {

     

       43
       -
             throw DidResolverError(

     

       44
       -
               'Unsupported DID method: ${extractDidMethod(did)}',

     

       45
       -
             );

     

       46
       -
           }

     

       47
       -
         }

     

       48
       -
       }

     

       49
       -
       

     

       50
       -
       /// Resolver for did:plc identifiers using the PLC directory.

     

       51
       -
       class DidPlcMethod {

     

       52
       -
         final Uri plcDirectoryUrl;

     

       53
       -
         final Dio dio;

     

       54
       -
       

     

       55
       -
         DidPlcMethod({String? plcDirectoryUrl, Dio? dio})

     

       56
       -
           : plcDirectoryUrl = Uri.parse(plcDirectoryUrl ?? defaultPlcDirectoryUrl),

     

       57
       -
             dio = dio ?? Dio();

     

       58
       -
       

     

       59
       -
         Future<DidDocument> resolve(String did, [ResolveDidOptions? options]) async {

     

       60
       -
           assertDidPlc(did);

     

       61
       -
       

     

       62
       -
           final url = plcDirectoryUrl.resolve('/${Uri.encodeComponent(did)}');

     

       63
       -
       

     

       64
       -
           try {

     

       65
       -
             final response = await dio.getUri(

     

       66
       -
               url,

     

       67
       -
               options: Options(

     

       68
       -
                 headers: {

     

       69
       -
                   'Accept': 'application/did+ld+json,application/json',

     

       70
       -
                   if (options?.noCache ?? false) 'Cache-Control': 'no-cache',

     

       71
       -
                 },

     

       72
       -
                 followRedirects: false,

     

       73
       -
                 validateStatus: (status) => status == 200,

     

       74
       -
               ),

     

       75
       -
               cancelToken: options?.cancelToken,

     

       76
       -
             );

     

       77
       -
       

     

       78
       -
             if (response.data is! Map<String, dynamic>) {

     

       79
       -
               throw DidResolverError(

     

       80
       -
                 'Invalid response format from PLC directory for $did',

     

       81
       -
               );

     

       82
       -
             }

     

       83
       -
       

     

       84
       -
             return DidDocument.fromJson(response.data as Map<String, dynamic>);

     

       85
       -
           } on DioException catch (e) {

     

       86
       -
             if (e.type == DioExceptionType.cancel) {

     

       87
       -
               throw DidResolverError('DID resolution was cancelled');

     

       88
       -
             }

     

       89
       -
       

     

       90
       -
             if (e.response?.statusCode == 404) {

     

       91
       -
               throw DidResolverError('DID not found: $did');

     

       92
       -
             }

     

       93
       -
       

     

       94
       -
             throw DidResolverError(

     

       95
       -
               'Failed to resolve DID from PLC directory: ${e.message}',

     

       96
       -
               e,

     

       97
       -
             );

     

       98
       -
           } catch (e) {

     

       99
       -
             if (e is DidResolverError) rethrow;

     

       100
       -
       

     

       101
       -
             throw DidResolverError('Unexpected error resolving DID: $e', e);

     

       102
       -
           }

     

       103
       -
         }

     

       104
       -
       }

     

       105
       -
       

     

       106
       -
       /// Resolver for did:web identifiers using HTTPS.

     

       107
       -
       class DidWebMethod {

     

       108
       -
         final Dio dio;

     

       109
       -
       

     

       110
       -
         DidWebMethod({Dio? dio}) : dio = dio ?? Dio();

     

       111
       -
       

     

       112
       -
         Future<DidDocument> resolve(String did, [ResolveDidOptions? options]) async {

     

       113
       -
           assertDidWeb(did);

     

       114
       -
       

     

       115
       -
           final baseUrl = didWebToUrl(did);

     

       116
       -
       

     

       117
       -
           // Try /.well-known/did.json first, then /did.json

     

       118
       -
           final urls = [

     

       119
       -
             baseUrl.resolve('/.well-known/did.json'),

     

       120
       -
             baseUrl.resolve('/did.json'),

     

       121
       -
           ];

     

       122
       -
       

     

       123
       -
           DioException? lastError;

     

       124
       -
       

     

       125
       -
           for (final url in urls) {

     

       126
       -
             try {

     

       127
       -
               final response = await dio.getUri(

     

       128
       -
                 url,

     

       129
       -
                 options: Options(

     

       130
       -
                   headers: {

     

       131
       -
                     'Accept': 'application/did+ld+json,application/json',

     

       132
       -
                     if (options?.noCache ?? false) 'Cache-Control': 'no-cache',

     

       133
       -
                   },

     

       134
       -
                   followRedirects: false,

     

       135
       -
                   validateStatus: (status) => status == 200,

     

       136
       -
                 ),

     

       137
       -
                 cancelToken: options?.cancelToken,

     

       138
       -
               );

     

       139
       -
       

     

       140
       -
               if (response.data is! Map<String, dynamic>) {

     

       141
       -
                 throw DidResolverError(

     

       142
       -
                   'Invalid response format from did:web for $did',

     

       143
       -
                 );

     

       144
       -
               }

     

       145
       -
       

     

       146
       -
               final doc = DidDocument.fromJson(response.data as Map<String, dynamic>);

     

       147
       -
       

     

       148
       -
               // Verify the DID in the document matches

     

       149
       -
               if (doc.id != did) {

     

       150
       -
                 throw DidResolverError(

     

       151
       -
                   'DID mismatch: expected $did but got ${doc.id}',

     

       152
       -
                 );

     

       153
       -
               }

     

       154
       -
       

     

       155
       -
               return doc;

     

       156
       -
             } on DioException catch (e) {

     

       157
       -
               if (e.type == DioExceptionType.cancel) {

     

       158
       -
                 throw DidResolverError('DID resolution was cancelled');

     

       159
       -
               }

     

       160
       -
       

     

       161
       -
               // If not found, try the next URL

     

       162
       -
               if (e.response?.statusCode == 404) {

     

       163
       -
                 lastError = e;

     

       164
       -
                 continue;

     

       165
       -
               }

     

       166
       -
       

     

       167
       -
               // Any other error, throw immediately

     

       168
       -
               throw DidResolverError('Failed to resolve did:web: ${e.message}', e);

     

       169
       -
             } catch (e) {

     

       170
       -
               if (e is DidResolverError) rethrow;

     

       171
       -
       

     

       172
       -
               throw DidResolverError('Unexpected error resolving did:web: $e', e);

     

       173
       -
             }

     

       174
       -
           }

     

       175
       -
       

     

       176
       -
           // If we get here, all URLs failed

     

       177
       -
           throw DidResolverError('DID document not found for $did', lastError);

     

       178
       -
         }

     

       179
       -
       }

     

       180
       -
       

     

       181
       -
       /// Cached DID resolver that wraps another resolver with caching.

     

       182
       -
       class CachedDidResolver implements DidResolver {

     

       183
       -
         final DidResolver _resolver;

     

       184
       -
         final DidCache _cache;

     

       185
       -
       

     

       186
       -
         CachedDidResolver(this._resolver, [DidCache? cache])

     

       187
       -
           : _cache = cache ?? InMemoryDidCache();

     

       188
       -
       

     

       189
       -
         @override

     

       190
       -
         Future<DidDocument> resolve(String did, [ResolveDidOptions? options]) async {

     

       191
       -
           // Check cache first unless noCache is set

     

       192
       -
           if (!(options?.noCache ?? false)) {

     

       193
       -
             final cached = await _cache.get(did);

     

       194
       -
             if (cached != null) {

     

       195
       -
               return cached;

     

       196
       -
             }

     

       197
       -
           }

     

       198
       -
       

     

       199
       -
           // Resolve and cache

     

       200
       -
           final doc = await _resolver.resolve(did, options);

     

       201
       -
           await _cache.set(did, doc);

     

       202
       -
       

     

       203
       -
           return doc;

     

       204
       -
         }

     

       205
       -
       

     

       206
       -
         /// Clears the cache

     

       207
       -
         Future<void> clearCache() => _cache.clear();

     

       208
       -
       }

     

       209
       -
       

     

       210
       -
       /// Interface for caching DID documents.

     

       211
       -
       abstract class DidCache {

     

       212
       -
         Future<DidDocument?> get(String did);

     

       213
       -
         Future<void> set(String did, DidDocument document);

     

       214
       -
         Future<void> clear();

     

       215
       -
       }

     

       216
       -
       

     

       217
       -
       /// Simple in-memory DID cache with expiration.

     

       218
       -
       class InMemoryDidCache implements DidCache {

     

       219
       -
         final Map<String, _CacheEntry> _cache = {};

     

       220
       -
         final Duration _ttl;

     

       221
       -
       

     

       222
       -
         InMemoryDidCache({Duration? ttl}) : _ttl = ttl ?? const Duration(hours: 24);

     

       223
       -
       

     

       224
       -
         @override

     

       225
       -
         Future<DidDocument?> get(String did) async {

     

       226
       -
           final entry = _cache[did];

     

       227
       -
           if (entry == null) return null;

     

       228
       -
       

     

       229
       -
           // Check if expired

     

       230
       -
           if (DateTime.now().isAfter(entry.expiresAt)) {

     

       231
       -
             _cache.remove(did);

     

       232
       -
             return null;

     

       233
       -
           }

     

       234
       -
       

     

       235
       -
           return entry.document;

     

       236
       -
         }

     

       237
       -
       

     

       238
       -
         @override

     

       239
       -
         Future<void> set(String did, DidDocument document) async {

     

       240
       -
           _cache[did] = _CacheEntry(

     

       241
       -
             document: document,

     

       242
       -
             expiresAt: DateTime.now().add(_ttl),

     

       243
       -
           );

     

       244
       -
         }

     

       245
       -
       

     

       246
       -
         @override

     

       247
       -
         Future<void> clear() async {

     

       248
       -
           _cache.clear();

     

       249
       -
         }

     

       250
       -
       }

     

       251
       -
       

     

       252
       -
       class _CacheEntry {

     

       253
       -
         final DidDocument document;

     

       254
       -
         final DateTime expiresAt;

     

       255
       -
       

     

       256
       -
         _CacheEntry({required this.document, required this.expiresAt});

     

       257
       -
       }

-35

packages/atproto_oauth_flutter/lib/src/identity/handle_helpers.dart

···

       1
       -
       import 'identity_resolver_error.dart';

     

       2
       -
       

     

       3
       -
       /// Normalizes a handle to lowercase.

     

       4
       -
       String normalizeHandle(String handle) => handle.toLowerCase();

     

       5
       -
       

     

       6
       -
       /// Checks if a handle is valid according to atProto spec.

     

       7
       -
       ///

     

       8
       -
       /// A valid handle must:

     

       9
       -
       /// - Be between 1 and 253 characters

     

       10
       -
       /// - Match the pattern: subdomain.domain.tld

     

       11
       -
       /// - Each label must start and end with alphanumeric

     

       12
       -
       /// - Labels can contain hyphens but not at boundaries

     

       13
       -
       bool isValidHandle(String handle) {

     

       14
       -
         if (handle.isEmpty || handle.length >= 254) return false;

     

       15
       -
       

     

       16
       -
         // Pattern: ([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?

     

       17
       -
         final pattern = RegExp(

     

       18
       -
           r'^([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?$',

     

       19
       -
         );

     

       20
       -
       

     

       21
       -
         return pattern.hasMatch(handle);

     

       22
       -
       }

     

       23
       -
       

     

       24
       -
       /// Returns a normalized handle if valid, null otherwise.

     

       25
       -
       String? asNormalizedHandle(String input) {

     

       26
       -
         final handle = normalizeHandle(input);

     

       27
       -
         return isValidHandle(handle) ? handle : null;

     

       28
       -
       }

     

       29
       -
       

     

       30
       -
       /// Asserts that a handle is valid.

     

       31
       -
       void assertValidHandle(String handle) {

     

       32
       -
         if (!isValidHandle(handle)) {

     

       33
       -
           throw InvalidHandleError(handle, 'Invalid handle format');

     

       34
       -
         }

     

       35
       -
       }

-202

packages/atproto_oauth_flutter/lib/src/identity/handle_resolver.dart

···

       1
       -
       import 'package:dio/dio.dart';

     

       2
       -
       

     

       3
       -
       import 'did_helpers.dart';

     

       4
       -
       import 'identity_resolver_error.dart';

     

       5
       -
       

     

       6
       -
       /// Options for handle resolution.

     

       7
       -
       class ResolveHandleOptions {

     

       8
       -
         /// Whether to bypass cache

     

       9
       -
         final bool noCache;

     

       10
       -
       

     

       11
       -
         /// Cancellation token for the request

     

       12
       -
         final CancelToken? cancelToken;

     

       13
       -
       

     

       14
       -
         const ResolveHandleOptions({this.noCache = false, this.cancelToken});

     

       15
       -
       }

     

       16
       -
       

     

       17
       -
       /// Interface for resolving atProto handles to DIDs.

     

       18
       -
       abstract class HandleResolver {

     

       19
       -
         /// Resolves an atProto handle to a DID.

     

       20
       -
         ///

     

       21
       -
         /// Returns null if the handle doesn't resolve to a DID (but no error occurred).

     

       22
       -
         /// Throws [HandleResolverError] if an unexpected error occurs during resolution.

     

       23
       -
         Future<String?> resolve(String handle, [ResolveHandleOptions? options]);

     

       24
       -
       }

     

       25
       -
       

     

       26
       -
       /// XRPC-based handle resolver that uses com.atproto.identity.resolveHandle.

     

       27
       -
       ///

     

       28
       -
       /// This resolver makes HTTP requests to an atProto XRPC service (typically

     

       29
       -
       /// a PDS or entryway service) to resolve handles.

     

       30
       -
       class XrpcHandleResolver implements HandleResolver {

     

       31
       -
         /// The base URL of the XRPC service

     

       32
       -
         final Uri serviceUrl;

     

       33
       -
       

     

       34
       -
         /// HTTP client for making requests

     

       35
       -
         final Dio dio;

     

       36
       -
       

     

       37
       -
         XrpcHandleResolver(String serviceUrl, {Dio? dio})

     

       38
       -
           : serviceUrl = Uri.parse(serviceUrl),

     

       39
       -
             dio = dio ?? Dio();

     

       40
       -
       

     

       41
       -
         @override

     

       42
       -
         Future<String?> resolve(

     

       43
       -
           String handle, [

     

       44
       -
           ResolveHandleOptions? options,

     

       45
       -
         ]) async {

     

       46
       -
           final url = serviceUrl.resolve('/xrpc/com.atproto.identity.resolveHandle');

     

       47
       -
           final uri = url.replace(queryParameters: {'handle': handle});

     

       48
       -
       

     

       49
       -
           try {

     

       50
       -
             final response = await dio.getUri(

     

       51
       -
               uri,

     

       52
       -
               options: Options(

     

       53
       -
                 headers: {if (options?.noCache ?? false) 'Cache-Control': 'no-cache'},

     

       54
       -
                 validateStatus: (status) {

     

       55
       -
                   // Allow 400 and 200 status codes

     

       56
       -
                   return status == 200 || status == 400;

     

       57
       -
                 },

     

       58
       -
               ),

     

       59
       -
               cancelToken: options?.cancelToken,

     

       60
       -
             );

     

       61
       -
       

     

       62
       -
             final data = response.data;

     

       63
       -
       

     

       64
       -
             // Handle 400 Bad Request (expected for invalid/unresolvable handles)

     

       65
       -
             if (response.statusCode == 400) {

     

       66
       -
               if (data is Map<String, dynamic>) {

     

       67
       -
                 final error = data['error'] as String?;

     

       68
       -
                 final message = data['message'] as String?;

     

       69
       -
       

     

       70
       -
                 // Expected response for handle that doesn't exist

     

       71
       -
                 if (error == 'InvalidRequest' &&

     

       72
       -
                     message == 'Unable to resolve handle') {

     

       73
       -
                   return null;

     

       74
       -
                 }

     

       75
       -
               }

     

       76
       -
       

     

       77
       -
               throw HandleResolverError(

     

       78
       -
                 'Invalid response from resolveHandle method: ${response.data}',

     

       79
       -
               );

     

       80
       -
             }

     

       81
       -
       

     

       82
       -
             // Handle successful response

     

       83
       -
             if (response.statusCode == 200) {

     

       84
       -
               if (data is! Map<String, dynamic>) {

     

       85
       -
                 throw HandleResolverError(

     

       86
       -
                   'Invalid response format from resolveHandle method',

     

       87
       -
                 );

     

       88
       -
               }

     

       89
       -
       

     

       90
       -
               final did = data['did'];

     

       91
       -
               if (did is! String) {

     

       92
       -
                 throw HandleResolverError(

     

       93
       -
                   'Missing or invalid DID in resolveHandle response',

     

       94
       -
                 );

     

       95
       -
               }

     

       96
       -
       

     

       97
       -
               // Validate that it's a proper atProto DID

     

       98
       -
               if (!isAtprotoDid(did)) {

     

       99
       -
                 throw HandleResolverError(

     

       100
       -
                   'Invalid DID returned from resolveHandle method: $did',

     

       101
       -
                 );

     

       102
       -
               }

     

       103
       -
       

     

       104
       -
               return did;

     

       105
       -
             }

     

       106
       -
       

     

       107
       -
             throw HandleResolverError(

     

       108
       -
               'Unexpected status code from resolveHandle method: ${response.statusCode}',

     

       109
       -
             );

     

       110
       -
           } on DioException catch (e) {

     

       111
       -
             if (e.type == DioExceptionType.cancel) {

     

       112
       -
               throw HandleResolverError('Handle resolution was cancelled');

     

       113
       -
             }

     

       114
       -
       

     

       115
       -
             throw HandleResolverError('Failed to resolve handle: ${e.message}', e);

     

       116
       -
           } catch (e) {

     

       117
       -
             if (e is HandleResolverError) rethrow;

     

       118
       -
       

     

       119
       -
             throw HandleResolverError('Unexpected error resolving handle: $e', e);

     

       120
       -
           }

     

       121
       -
         }

     

       122
       -
       }

     

       123
       -
       

     

       124
       -
       /// Cached handle resolver that wraps another resolver with caching.

     

       125
       -
       class CachedHandleResolver implements HandleResolver {

     

       126
       -
         final HandleResolver _resolver;

     

       127
       -
         final HandleCache _cache;

     

       128
       -
       

     

       129
       -
         CachedHandleResolver(this._resolver, [HandleCache? cache])

     

       130
       -
           : _cache = cache ?? InMemoryHandleCache();

     

       131
       -
       

     

       132
       -
         @override

     

       133
       -
         Future<String?> resolve(

     

       134
       -
           String handle, [

     

       135
       -
           ResolveHandleOptions? options,

     

       136
       -
         ]) async {

     

       137
       -
           // Check cache first unless noCache is set

     

       138
       -
           if (!(options?.noCache ?? false)) {

     

       139
       -
             final cached = await _cache.get(handle);

     

       140
       -
             if (cached != null) {

     

       141
       -
               return cached;

     

       142
       -
             }

     

       143
       -
           }

     

       144
       -
       

     

       145
       -
           // Resolve and cache

     

       146
       -
           final did = await _resolver.resolve(handle, options);

     

       147
       -
           if (did != null) {

     

       148
       -
             await _cache.set(handle, did);

     

       149
       -
           }

     

       150
       -
       

     

       151
       -
           return did;

     

       152
       -
         }

     

       153
       -
       

     

       154
       -
         /// Clears the cache

     

       155
       -
         Future<void> clearCache() => _cache.clear();

     

       156
       -
       }

     

       157
       -
       

     

       158
       -
       /// Interface for caching handle resolution results.

     

       159
       -
       abstract class HandleCache {

     

       160
       -
         Future<String?> get(String handle);

     

       161
       -
         Future<void> set(String handle, String did);

     

       162
       -
         Future<void> clear();

     

       163
       -
       }

     

       164
       -
       

     

       165
       -
       /// Simple in-memory handle cache with expiration.

     

       166
       -
       class InMemoryHandleCache implements HandleCache {

     

       167
       -
         final Map<String, _CacheEntry> _cache = {};

     

       168
       -
         final Duration _ttl;

     

       169
       -
       

     

       170
       -
         InMemoryHandleCache({Duration? ttl}) : _ttl = ttl ?? const Duration(hours: 1);

     

       171
       -
       

     

       172
       -
         @override

     

       173
       -
         Future<String?> get(String handle) async {

     

       174
       -
           final entry = _cache[handle];

     

       175
       -
           if (entry == null) return null;

     

       176
       -
       

     

       177
       -
           // Check if expired

     

       178
       -
           if (DateTime.now().isAfter(entry.expiresAt)) {

     

       179
       -
             _cache.remove(handle);

     

       180
       -
             return null;

     

       181
       -
           }

     

       182
       -
       

     

       183
       -
           return entry.did;

     

       184
       -
         }

     

       185
       -
       

     

       186
       -
         @override

     

       187
       -
         Future<void> set(String handle, String did) async {

     

       188
       -
           _cache[handle] = _CacheEntry(did: did, expiresAt: DateTime.now().add(_ttl));

     

       189
       -
         }

     

       190
       -
       

     

       191
       -
         @override

     

       192
       -
         Future<void> clear() async {

     

       193
       -
           _cache.clear();

     

       194
       -
         }

     

       195
       -
       }

     

       196
       -
       

     

       197
       -
       class _CacheEntry {

     

       198
       -
         final String did;

     

       199
       -
         final DateTime expiresAt;

     

       200
       -
       

     

       201
       -
         _CacheEntry({required this.did, required this.expiresAt});

     

       202
       -
       }

-47

packages/atproto_oauth_flutter/lib/src/identity/identity.dart

···

       1
       -
       /// Identity resolution for atProto.

     

       2
       -
       ///

     

       3
       -
       /// This module provides the core identity resolution functionality for atProto,

     

       4
       -
       /// enabling decentralized identity through handle and DID resolution.

     

       5
       -
       ///

     

       6
       -
       /// ## Key Components

     

       7
       -
       ///

     

       8
       -
       /// - **IdentityResolver**: Main interface for resolving handles/DIDs to identity info

     

       9
       -
       /// - **HandleResolver**: Resolves atProto handles (e.g., "alice.bsky.social") to DIDs

     

       10
       -
       /// - **DidResolver**: Resolves DIDs to DID documents

     

       11
       -
       /// - **DidDocument**: Represents a DID document with services and handles

     

       12
       -
       ///

     

       13
       -
       /// ## Why This Matters for Decentralization

     

       14
       -
       ///

     

       15
       -
       /// This is the **most important module for atProto decentralization**. It enables:

     

       16
       -
       /// 1. Users to host their data on any PDS, not just bsky.social

     

       17
       -
       /// 2. Custom domain handles (e.g., "alice.example.com")

     

       18
       -
       /// 3. Portable identity (change PDS without losing identity)

     

       19
       -
       ///

     

       20
       -
       /// ## Usage

     

       21
       -
       ///

     

       22
       -
       /// ```dart

     

       23
       -
       /// // Create a resolver

     

       24
       -
       /// final resolver = AtprotoIdentityResolver.withDefaults(

     

       25
       -
       ///   handleResolverUrl: 'https://bsky.social',

     

       26
       -
       /// );

     

       27
       -
       ///

     

       28
       -
       /// // Resolve a handle to find their PDS

     

       29
       -
       /// final pdsUrl = await resolver.resolveToPds('alice.bsky.social');

     

       30
       -
       /// print('Alice\'s PDS: $pdsUrl');

     

       31
       -
       ///

     

       32
       -
       /// // Get full identity info

     

       33
       -
       /// final info = await resolver.resolve('alice.bsky.social');

     

       34
       -
       /// print('DID: ${info.did}');

     

       35
       -
       /// print('Handle: ${info.handle}');

     

       36
       -
       /// print('PDS: ${info.pdsUrl}');

     

       37
       -
       /// ```

     

       38
       -
       library;

     

       39
       -
       

     

       40
       -
       export 'constants.dart';

     

       41
       -
       export 'did_document.dart';

     

       42
       -
       export 'did_helpers.dart';

     

       43
       -
       export 'did_resolver.dart';

     

       44
       -
       export 'handle_helpers.dart';

     

       45
       -
       export 'handle_resolver.dart';

     

       46
       -
       export 'identity_resolver.dart';

     

       47
       -
       export 'identity_resolver_error.dart';

-366

packages/atproto_oauth_flutter/lib/src/identity/identity_resolver.dart

···

       1
       -
       import 'package:dio/dio.dart';

     

       2
       -
       

     

       3
       -
       import 'constants.dart';

     

       4
       -
       import 'did_document.dart';

     

       5
       -
       import 'did_helpers.dart';

     

       6
       -
       import 'did_resolver.dart';

     

       7
       -
       import 'handle_helpers.dart';

     

       8
       -
       import 'handle_resolver.dart';

     

       9
       -
       import 'identity_resolver_error.dart';

     

       10
       -
       

     

       11
       -
       /// Represents resolved identity information for an atProto user.

     

       12
       -
       ///

     

       13
       -
       /// This combines DID, DID document, and validated handle information.

     

       14
       -
       class IdentityInfo {

     

       15
       -
         /// The DID (Decentralized Identifier) for this identity

     

       16
       -
         final String did;

     

       17
       -
       

     

       18
       -
         /// The complete DID document

     

       19
       -
         final DidDocument didDoc;

     

       20
       -
       

     

       21
       -
         /// The validated handle, or 'handle.invalid' if handle validation failed

     

       22
       -
         final String handle;

     

       23
       -
       

     

       24
       -
         const IdentityInfo({

     

       25
       -
           required this.did,

     

       26
       -
           required this.didDoc,

     

       27
       -
           required this.handle,

     

       28
       -
         });

     

       29
       -
       

     

       30
       -
         /// Whether the handle is valid (not 'handle.invalid')

     

       31
       -
         bool get hasValidHandle => handle != handleInvalid;

     

       32
       -
       

     

       33
       -
         /// Extracts the PDS URL from the DID document.

     

       34
       -
         ///

     

       35
       -
         /// Returns null if no PDS service is found.

     

       36
       -
         String? get pdsUrl => didDoc.extractPdsUrl();

     

       37
       -
       }

     

       38
       -
       

     

       39
       -
       /// Options for identity resolution.

     

       40
       -
       class ResolveIdentityOptions {

     

       41
       -
         /// Whether to bypass cache

     

       42
       -
         final bool noCache;

     

       43
       -
       

     

       44
       -
         /// Cancellation token for the request

     

       45
       -
         final CancelToken? cancelToken;

     

       46
       -
       

     

       47
       -
         const ResolveIdentityOptions({this.noCache = false, this.cancelToken});

     

       48
       -
       }

     

       49
       -
       

     

       50
       -
       /// Interface for resolving atProto identities (handles or DIDs) to complete identity info.

     

       51
       -
       abstract class IdentityResolver {

     

       52
       -
         /// Resolves an identifier (handle or DID) to complete identity information.

     

       53
       -
         ///

     

       54
       -
         /// The identifier can be either:

     

       55
       -
         /// - An atProto handle (e.g., "alice.bsky.social")

     

       56
       -
         /// - A DID (e.g., "did:plc:...")

     

       57
       -
         ///

     

       58
       -
         /// Returns [IdentityInfo] with DID, DID document, and validated handle.

     

       59
       -
         Future<IdentityInfo> resolve(

     

       60
       -
           String identifier, [

     

       61
       -
           ResolveIdentityOptions? options,

     

       62
       -
         ]);

     

       63
       -
       }

     

       64
       -
       

     

       65
       -
       /// Implementation of the official atProto identity resolution strategy.

     

       66
       -
       ///

     

       67
       -
       /// This resolver:

     

       68
       -
       /// 1. Determines if input is a handle or DID

     

       69
       -
       /// 2. Resolves handle → DID (if needed)

     

       70
       -
       /// 3. Fetches DID document

     

       71
       -
       /// 4. Validates bi-directional resolution (handle in DID doc matches original)

     

       72
       -
       /// 5. Extracts PDS URL from DID document

     

       73
       -
       ///

     

       74
       -
       /// This is the **critical piece for decentralization** - it ensures users can

     

       75
       -
       /// host their data on any PDS, not just bsky.social.

     

       76
       -
       class AtprotoIdentityResolver implements IdentityResolver {

     

       77
       -
         final DidResolver didResolver;

     

       78
       -
         final HandleResolver handleResolver;

     

       79
       -
       

     

       80
       -
         AtprotoIdentityResolver({

     

       81
       -
           required this.didResolver,

     

       82
       -
           required this.handleResolver,

     

       83
       -
         });

     

       84
       -
       

     

       85
       -
         /// Factory constructor with defaults for typical usage.

     

       86
       -
         ///

     

       87
       -
         /// [handleResolverUrl] should point to an atProto XRPC service that

     

       88
       -
         /// implements com.atproto.identity.resolveHandle. Typically this is

     

       89
       -
         /// https://bsky.social for public resolution, or your own PDS.

     

       90
       -
         factory AtprotoIdentityResolver.withDefaults({

     

       91
       -
           required String handleResolverUrl,

     

       92
       -
           String? plcDirectoryUrl,

     

       93
       -
           Dio? dio,

     

       94
       -
           DidCache? didCache,

     

       95
       -
           HandleCache? handleCache,

     

       96
       -
         }) {

     

       97
       -
           final dioInstance = dio ?? Dio();

     

       98
       -
       

     

       99
       -
           final baseDidResolver = AtprotoDidResolver(

     

       100
       -
             plcDirectoryUrl: plcDirectoryUrl,

     

       101
       -
             dio: dioInstance,

     

       102
       -
           );

     

       103
       -
       

     

       104
       -
           final baseHandleResolver = XrpcHandleResolver(

     

       105
       -
             handleResolverUrl,

     

       106
       -
             dio: dioInstance,

     

       107
       -
           );

     

       108
       -
       

     

       109
       -
           return AtprotoIdentityResolver(

     

       110
       -
             didResolver: CachedDidResolver(baseDidResolver, didCache),

     

       111
       -
             handleResolver: CachedHandleResolver(baseHandleResolver, handleCache),

     

       112
       -
           );

     

       113
       -
         }

     

       114
       -
       

     

       115
       -
         @override

     

       116
       -
         Future<IdentityInfo> resolve(

     

       117
       -
           String identifier, [

     

       118
       -
           ResolveIdentityOptions? options,

     

       119
       -
         ]) async {

     

       120
       -
           return isDid(identifier)

     

       121
       -
               ? resolveFromDid(identifier, options)

     

       122
       -
               : resolveFromHandle(identifier, options);

     

       123
       -
         }

     

       124
       -
       

     

       125
       -
         /// Resolves identity starting from a DID.

     

       126
       -
         ///

     

       127
       -
         /// This:

     

       128
       -
         /// 1. Fetches the DID document

     

       129
       -
         /// 2. Extracts the handle from alsoKnownAs

     

       130
       -
         /// 3. Validates that the handle resolves back to the same DID

     

       131
       -
         Future<IdentityInfo> resolveFromDid(

     

       132
       -
           String did, [

     

       133
       -
           ResolveIdentityOptions? options,

     

       134
       -
         ]) async {

     

       135
       -
           final document = await getDocumentFromDid(did, options);

     

       136
       -
       

     

       137
       -
           // We will only return the document's handle alias if it resolves to the

     

       138
       -
           // same DID as the input (bi-directional validation)

     

       139
       -
           final handle = document.extractNormalizedHandle();

     

       140
       -
           String? resolvedDid;

     

       141
       -
       

     

       142
       -
           if (handle != null) {

     

       143
       -
             try {

     

       144
       -
               resolvedDid = await handleResolver.resolve(

     

       145
       -
                 handle,

     

       146
       -
                 ResolveHandleOptions(

     

       147
       -
                   noCache: options?.noCache ?? false,

     

       148
       -
                   cancelToken: options?.cancelToken,

     

       149
       -
                 ),

     

       150
       -
               );

     

       151
       -
             } catch (e) {

     

       152
       -
               // Ignore errors (handle might be temporarily unavailable)

     

       153
       -
               resolvedDid = null;

     

       154
       -
             }

     

       155
       -
           }

     

       156
       -
       

     

       157
       -
           return IdentityInfo(

     

       158
       -
             did: document.id,

     

       159
       -
             didDoc: document,

     

       160
       -
             handle: handle != null && resolvedDid == did ? handle : handleInvalid,

     

       161
       -
           );

     

       162
       -
         }

     

       163
       -
       

     

       164
       -
         /// Resolves identity starting from a handle.

     

       165
       -
         ///

     

       166
       -
         /// This:

     

       167
       -
         /// 1. Resolves handle → DID

     

       168
       -
         /// 2. Fetches DID document

     

       169
       -
         /// 3. Validates that the DID document contains the original handle

     

       170
       -
         Future<IdentityInfo> resolveFromHandle(

     

       171
       -
           String handle, [

     

       172
       -
           ResolveIdentityOptions? options,

     

       173
       -
         ]) async {

     

       174
       -
           final document = await getDocumentFromHandle(handle, options);

     

       175
       -
       

     

       176
       -
           // Bi-directional resolution is enforced in getDocumentFromHandle()

     

       177
       -
           return IdentityInfo(

     

       178
       -
             did: document.id,

     

       179
       -
             didDoc: document,

     

       180
       -
             handle: document.extractNormalizedHandle() ?? handleInvalid,

     

       181
       -
           );

     

       182
       -
         }

     

       183
       -
       

     

       184
       -
         /// Fetches a DID document from a DID.

     

       185
       -
         Future<DidDocument> getDocumentFromDid(

     

       186
       -
           String did, [

     

       187
       -
           ResolveIdentityOptions? options,

     

       188
       -
         ]) async {

     

       189
       -
           return didResolver.resolve(

     

       190
       -
             did,

     

       191
       -
             ResolveDidOptions(

     

       192
       -
               noCache: options?.noCache ?? false,

     

       193
       -
               cancelToken: options?.cancelToken,

     

       194
       -
             ),

     

       195
       -
           );

     

       196
       -
         }

     

       197
       -
       

     

       198
       -
         /// Fetches a DID document from a handle with bi-directional validation.

     

       199
       -
         ///

     

       200
       -
         /// This method:

     

       201
       -
         /// 1. Normalizes and validates the handle

     

       202
       -
         /// 2. Resolves handle → DID

     

       203
       -
         /// 3. Fetches DID document

     

       204
       -
         /// 4. Verifies the DID document contains the original handle

     

       205
       -
         Future<DidDocument> getDocumentFromHandle(

     

       206
       -
           String input, [

     

       207
       -
           ResolveIdentityOptions? options,

     

       208
       -
         ]) async {

     

       209
       -
           final handle = asNormalizedHandle(input);

     

       210
       -
           if (handle == null) {

     

       211
       -
             throw InvalidHandleError(input, 'Invalid handle format');

     

       212
       -
           }

     

       213
       -
       

     

       214
       -
           final did = await handleResolver.resolve(

     

       215
       -
             handle,

     

       216
       -
             ResolveHandleOptions(

     

       217
       -
               noCache: options?.noCache ?? false,

     

       218
       -
               cancelToken: options?.cancelToken,

     

       219
       -
             ),

     

       220
       -
           );

     

       221
       -
       

     

       222
       -
           if (did == null) {

     

       223
       -
             throw IdentityResolverError('Handle "$handle" does not resolve to a DID');

     

       224
       -
           }

     

       225
       -
       

     

       226
       -
           // Fetch the DID document

     

       227
       -
           final document = await didResolver.resolve(

     

       228
       -
             did,

     

       229
       -
             ResolveDidOptions(

     

       230
       -
               noCache: options?.noCache ?? false,

     

       231
       -
               cancelToken: options?.cancelToken,

     

       232
       -
             ),

     

       233
       -
           );

     

       234
       -
       

     

       235
       -
           // Enforce bi-directional resolution

     

       236
       -
           final docHandle = document.extractNormalizedHandle();

     

       237
       -
           if (handle != docHandle) {

     

       238
       -
             throw IdentityResolverError(

     

       239
       -
               'DID document for "$did" does not include the handle "$handle" '

     

       240
       -
               '(found: ${docHandle ?? "none"})',

     

       241
       -
             );

     

       242
       -
           }

     

       243
       -
       

     

       244
       -
           return document;

     

       245
       -
         }

     

       246
       -
       

     

       247
       -
         /// Convenience method to resolve directly to PDS URL.

     

       248
       -
         ///

     

       249
       -
         /// This is the most common use case: given a handle or DID, find the PDS URL.

     

       250
       -
         Future<String> resolveToPds(

     

       251
       -
           String identifier, [

     

       252
       -
           ResolveIdentityOptions? options,

     

       253
       -
         ]) async {

     

       254
       -
           final info = await resolve(identifier, options);

     

       255
       -
           final pdsUrl = info.pdsUrl;

     

       256
       -
       

     

       257
       -
           if (pdsUrl == null) {

     

       258
       -
             throw IdentityResolverError(

     

       259
       -
               'No PDS endpoint found in DID document for $identifier',

     

       260
       -
             );

     

       261
       -
           }

     

       262
       -
       

     

       263
       -
           return pdsUrl;

     

       264
       -
         }

     

       265
       -
       }

     

       266
       -
       

     

       267
       -
       /// Options for creating an identity resolver.

     

       268
       -
       class IdentityResolverOptions {

     

       269
       -
         /// Custom identity resolver (if not provided, AtprotoIdentityResolver is used)

     

       270
       -
         final IdentityResolver? identityResolver;

     

       271
       -
       

     

       272
       -
         /// Custom DID resolver

     

       273
       -
         final DidResolver? didResolver;

     

       274
       -
       

     

       275
       -
         /// Custom handle resolver (or URL string for XRPC resolver)

     

       276
       -
         final dynamic handleResolver; // HandleResolver, String, or Uri

     

       277
       -
       

     

       278
       -
         /// Custom DID cache

     

       279
       -
         final DidCache? didCache;

     

       280
       -
       

     

       281
       -
         /// Custom handle cache

     

       282
       -
         final HandleCache? handleCache;

     

       283
       -
       

     

       284
       -
         /// Custom Dio instance for HTTP requests

     

       285
       -
         final Dio? dio;

     

       286
       -
       

     

       287
       -
         /// PLC directory URL (defaults to https://plc.directory/)

     

       288
       -
         final String? plcDirectoryUrl;

     

       289
       -
       

     

       290
       -
         const IdentityResolverOptions({

     

       291
       -
           this.identityResolver,

     

       292
       -
           this.didResolver,

     

       293
       -
           this.handleResolver,

     

       294
       -
           this.didCache,

     

       295
       -
           this.handleCache,

     

       296
       -
           this.dio,

     

       297
       -
           this.plcDirectoryUrl,

     

       298
       -
         });

     

       299
       -
       }

     

       300
       -
       

     

       301
       -
       /// Creates an identity resolver with the given options.

     

       302
       -
       ///

     

       303
       -
       /// This is the main entry point for creating an identity resolver.

     

       304
       -
       /// It handles setting up default implementations with proper caching.

     

       305
       -
       IdentityResolver createIdentityResolver(IdentityResolverOptions options) {

     

       306
       -
         // If a custom identity resolver is provided, use it

     

       307
       -
         if (options.identityResolver != null) {

     

       308
       -
           return options.identityResolver!;

     

       309
       -
         }

     

       310
       -
       

     

       311
       -
         final dioInstance = options.dio ?? Dio();

     

       312
       -
       

     

       313
       -
         // Create DID resolver

     

       314
       -
         final didResolver = _createDidResolver(options, dioInstance);

     

       315
       -
       

     

       316
       -
         // Create handle resolver

     

       317
       -
         final handleResolver = _createHandleResolver(options, dioInstance);

     

       318
       -
       

     

       319
       -
         return AtprotoIdentityResolver(

     

       320
       -
           didResolver: didResolver,

     

       321
       -
           handleResolver: handleResolver,

     

       322
       -
         );

     

       323
       -
       }

     

       324
       -
       

     

       325
       -
       DidResolver _createDidResolver(IdentityResolverOptions options, Dio dio) {

     

       326
       -
         final didResolver =

     

       327
       -
             options.didResolver ??

     

       328
       -
             AtprotoDidResolver(plcDirectoryUrl: options.plcDirectoryUrl, dio: dio);

     

       329
       -
       

     

       330
       -
         // Wrap with cache if not already cached

     

       331
       -
         if (didResolver is CachedDidResolver && options.didCache == null) {

     

       332
       -
           return didResolver;

     

       333
       -
         }

     

       334
       -
       

     

       335
       -
         return CachedDidResolver(didResolver, options.didCache);

     

       336
       -
       }

     

       337
       -
       

     

       338
       -
       HandleResolver _createHandleResolver(IdentityResolverOptions options, Dio dio) {

     

       339
       -
         final handleResolverInput = options.handleResolver;

     

       340
       -
       

     

       341
       -
         if (handleResolverInput == null) {

     

       342
       -
           throw ArgumentError(

     

       343
       -
             'handleResolver is required. Provide either a HandleResolver instance, '

     

       344
       -
             'a URL string, or a Uri pointing to an XRPC service.',

     

       345
       -
           );

     

       346
       -
         }

     

       347
       -
       

     

       348
       -
         HandleResolver baseResolver;

     

       349
       -
       

     

       350
       -
         if (handleResolverInput is HandleResolver) {

     

       351
       -
           baseResolver = handleResolverInput;

     

       352
       -
         } else if (handleResolverInput is String || handleResolverInput is Uri) {

     

       353
       -
           baseResolver = XrpcHandleResolver(handleResolverInput.toString(), dio: dio);

     

       354
       -
         } else {

     

       355
       -
           throw ArgumentError(

     

       356
       -
             'handleResolver must be a HandleResolver, String, or Uri',

     

       357
       -
           );

     

       358
       -
         }

     

       359
       -
       

     

       360
       -
         // Wrap with cache if not already cached

     

       361
       -
         if (baseResolver is CachedHandleResolver && options.handleCache == null) {

     

       362
       -
           return baseResolver;

     

       363
       -
         }

     

       364
       -
       

     

       365
       -
         return CachedHandleResolver(baseResolver, options.handleCache);

     

       366
       -
       }

-53

packages/atproto_oauth_flutter/lib/src/identity/identity_resolver_error.dart

···

       1
       -
       /// Error thrown when identity resolution fails.

     

       2
       -
       ///

     

       3
       -
       /// This error is thrown when resolving an atProto handle or DID fails,

     

       4
       -
       /// including cases such as:

     

       5
       -
       /// - Invalid handle format

     

       6
       -
       /// - Handle doesn't resolve to a DID

     

       7
       -
       /// - DID document is malformed or missing required fields

     

       8
       -
       /// - Bi-directional resolution fails (handle in DID doc doesn't match)

     

       9
       -
       class IdentityResolverError extends Error {

     

       10
       -
         /// The error message describing what went wrong

     

       11
       -
         final String message;

     

       12
       -
       

     

       13
       -
         /// Optional underlying cause of the error

     

       14
       -
         final Object? cause;

     

       15
       -
       

     

       16
       -
         IdentityResolverError(this.message, [this.cause]);

     

       17
       -
       

     

       18
       -
         @override

     

       19
       -
         String toString() {

     

       20
       -
           if (cause != null) {

     

       21
       -
             return 'IdentityResolverError: $message\nCaused by: $cause';

     

       22
       -
           }

     

       23
       -
           return 'IdentityResolverError: $message';

     

       24
       -
         }

     

       25
       -
       }

     

       26
       -
       

     

       27
       -
       /// Error thrown when a DID is invalid or malformed.

     

       28
       -
       class InvalidDidError extends IdentityResolverError {

     

       29
       -
         /// The invalid DID that was provided

     

       30
       -
         final String did;

     

       31
       -
       

     

       32
       -
         InvalidDidError(this.did, String message, [Object? cause])

     

       33
       -
           : super('Invalid DID "$did": $message', cause);

     

       34
       -
       }

     

       35
       -
       

     

       36
       -
       /// Error thrown when a handle is invalid or malformed.

     

       37
       -
       class InvalidHandleError extends IdentityResolverError {

     

       38
       -
         /// The invalid handle that was provided

     

       39
       -
         final String handle;

     

       40
       -
       

     

       41
       -
         InvalidHandleError(this.handle, String message, [Object? cause])

     

       42
       -
           : super('Invalid handle "$handle": $message', cause);

     

       43
       -
       }

     

       44
       -
       

     

       45
       -
       /// Error thrown when handle resolution fails.

     

       46
       -
       class HandleResolverError extends IdentityResolverError {

     

       47
       -
         HandleResolverError(super.message, [super.cause]);

     

       48
       -
       }

     

       49
       -
       

     

       50
       -
       /// Error thrown when DID resolution fails.

     

       51
       -
       class DidResolverError extends IdentityResolverError {

     

       52
       -
         DidResolverError(super.message, [super.cause]);

     

       53
       -
       }

-248

packages/atproto_oauth_flutter/lib/src/oauth/authorization_server_metadata_resolver.dart

···

       1
       -
       import 'package:dio/dio.dart';

     

       2
       -
       

     

       3
       -
       import '../dpop/fetch_dpop.dart';

     

       4
       -
       import '../util.dart';

     

       5
       -
       

     

       6
       -
       /// Options for getting cached values.

     

       7
       -
       class GetCachedOptions {

     

       8
       -
         /// Whether to bypass cache and force a fresh fetch

     

       9
       -
         final bool noCache;

     

       10
       -
       

     

       11
       -
         /// Whether to allow returning stale cached values

     

       12
       -
         final bool allowStale;

     

       13
       -
       

     

       14
       -
         /// Optional cancellation token

     

       15
       -
         final CancelToken? cancelToken;

     

       16
       -
       

     

       17
       -
         const GetCachedOptions({

     

       18
       -
           this.noCache = false,

     

       19
       -
           this.allowStale = true,

     

       20
       -
           this.cancelToken,

     

       21
       -
         });

     

       22
       -
       }

     

       23
       -
       

     

       24
       -
       /// Cache interface for authorization server metadata.

     

       25
       -
       ///

     

       26
       -
       /// Implementations should store metadata keyed by issuer URL.

     

       27
       -
       typedef AuthorizationServerMetadataCache =

     

       28
       -
           SimpleStore<String, Map<String, dynamic>>;

     

       29
       -
       

     

       30
       -
       /// Configuration for the authorization server metadata resolver.

     

       31
       -
       class OAuthAuthorizationServerMetadataResolverConfig {

     

       32
       -
         /// Whether to allow HTTP (non-HTTPS) issuer URLs.

     

       33
       -
         ///

     

       34
       -
         /// Should only be true in development/test environments.

     

       35
       -
         /// Production MUST use HTTPS.

     

       36
       -
         final bool allowHttpIssuer;

     

       37
       -
       

     

       38
       -
         const OAuthAuthorizationServerMetadataResolverConfig({

     

       39
       -
           this.allowHttpIssuer = false,

     

       40
       -
         });

     

       41
       -
       }

     

       42
       -
       

     

       43
       -
       /// Resolves OAuth Authorization Server Metadata via RFC 8414 discovery.

     

       44
       -
       ///

     

       45
       -
       /// This class:

     

       46
       -
       /// 1. Validates issuer URLs (must be HTTPS in production)

     

       47
       -
       /// 2. Fetches metadata from `{issuer}/.well-known/oauth-authorization-server`

     

       48
       -
       /// 3. Validates the metadata against the spec

     

       49
       -
       /// 4. Verifies issuer matches (prevents MIX-UP attacks)

     

       50
       -
       /// 5. Ensures ATPROTO requirements (client_id_metadata_document)

     

       51
       -
       /// 6. Caches metadata to avoid repeated fetches

     

       52
       -
       ///

     

       53
       -
       /// See: https://datatracker.ietf.org/doc/html/rfc8414

     

       54
       -
       class OAuthAuthorizationServerMetadataResolver {

     

       55
       -
         final AuthorizationServerMetadataCache _cache;

     

       56
       -
         final Dio _dio;

     

       57
       -
         final bool _allowHttpIssuer;

     

       58
       -
       

     

       59
       -
         /// Creates a resolver with the given cache and HTTP client.

     

       60
       -
         ///

     

       61
       -
         /// [cache] is used to store fetched metadata. Use an in-memory store for

     

       62
       -
         /// testing or a persistent store for production.

     

       63
       -
         ///

     

       64
       -
         /// [dio] is the HTTP client. If not provided, creates a default instance.

     

       65
       -
         ///

     

       66
       -
         /// [config] allows customizing behavior (e.g., allowing HTTP in tests).

     

       67
       -
         OAuthAuthorizationServerMetadataResolver(

     

       68
       -
           this._cache, {

     

       69
       -
           Dio? dio,

     

       70
       -
           OAuthAuthorizationServerMetadataResolverConfig? config,

     

       71
       -
         }) : _dio = dio ?? Dio(),

     

       72
       -
              _allowHttpIssuer = config?.allowHttpIssuer ?? false;

     

       73
       -
       

     

       74
       -
         /// Resolves authorization server metadata for the given issuer.

     

       75
       -
         ///

     

       76
       -
         /// The [input] should be a valid issuer identifier (typically an HTTPS URL).

     

       77
       -
         ///

     

       78
       -
         /// Returns the complete metadata as a Map. Throws if:

     

       79
       -
         /// - Input is not a valid issuer URL

     

       80
       -
         /// - HTTP is used in production (allowHttpIssuer = false)

     

       81
       -
         /// - Network request fails

     

       82
       -
         /// - Response is not valid JSON

     

       83
       -
         /// - Metadata validation fails

     

       84
       -
         /// - Issuer mismatch detected

     

       85
       -
         /// - ATPROTO requirements not met

     

       86
       -
         ///

     

       87
       -
         /// Example:

     

       88
       -
         /// ```dart

     

       89
       -
         /// final resolver = OAuthAuthorizationServerMetadataResolver(cache);

     

       90
       -
         /// final metadata = await resolver.get('https://pds.example.com');

     

       91
       -
         /// print(metadata['authorization_endpoint']);

     

       92
       -
         /// ```

     

       93
       -
         Future<Map<String, dynamic>> get(

     

       94
       -
           String input, [

     

       95
       -
           GetCachedOptions? options,

     

       96
       -
         ]) async {

     

       97
       -
           // Validate and normalize issuer URL

     

       98
       -
           final issuer = _validateIssuer(input);

     

       99
       -
       

     

       100
       -
           // Security check: disallow HTTP in production

     

       101
       -
           if (!_allowHttpIssuer && issuer.startsWith('http:')) {

     

       102
       -
             throw FormatException(

     

       103
       -
               'Unsecure issuer URL protocol only allowed in development and test environments',

     

       104
       -
             );

     

       105
       -
           }

     

       106
       -
       

     

       107
       -
           // Check cache first (unless noCache is set)

     

       108
       -
           if (options?.noCache != true) {

     

       109
       -
             final cached = await _cache.get(issuer);

     

       110
       -
             if (cached != null) {

     

       111
       -
               return cached;

     

       112
       -
             }

     

       113
       -
           }

     

       114
       -
       

     

       115
       -
           // Fetch fresh metadata

     

       116
       -
           final metadata = await _fetchMetadata(issuer, options);

     

       117
       -
       

     

       118
       -
           // Store in cache

     

       119
       -
           await _cache.set(issuer, metadata);

     

       120
       -
       

     

       121
       -
           return metadata;

     

       122
       -
         }

     

       123
       -
       

     

       124
       -
         /// Fetches metadata from the well-known endpoint.

     

       125
       -
         Future<Map<String, dynamic>> _fetchMetadata(

     

       126
       -
           String issuer,

     

       127
       -
           GetCachedOptions? options,

     

       128
       -
         ) async {

     

       129
       -
           final url =

     

       130
       -
               Uri.parse(

     

       131
       -
                 issuer,

     

       132
       -
               ).replace(path: '/.well-known/oauth-authorization-server').toString();

     

       133
       -
       

     

       134
       -
           try {

     

       135
       -
             final response = await _dio.get<Map<String, dynamic>>(

     

       136
       -
               url,

     

       137
       -
               options: Options(

     

       138
       -
                 headers: {'accept': 'application/json'},

     

       139
       -
                 followRedirects: false, // response must be 200 OK, no redirects

     

       140
       -
                 validateStatus: (status) => status == 200,

     

       141
       -
               ),

     

       142
       -
               cancelToken: options?.cancelToken,

     

       143
       -
             );

     

       144
       -
       

     

       145
       -
             // Verify content type

     

       146
       -
             final contentType = contentMime(

     

       147
       -
               response.headers.map.map((key, value) => MapEntry(key, value.first)),

     

       148
       -
             );

     

       149
       -
       

     

       150
       -
             if (contentType != 'application/json') {

     

       151
       -
               throw DioException(

     

       152
       -
                 requestOptions: response.requestOptions,

     

       153
       -
                 response: response,

     

       154
       -
                 type: DioExceptionType.badResponse,

     

       155
       -
                 message: 'Unexpected content type for "$url"',

     

       156
       -
               );

     

       157
       -
             }

     

       158
       -
       

     

       159
       -
             final metadata = response.data;

     

       160
       -
             if (metadata == null) {

     

       161
       -
               throw DioException(

     

       162
       -
                 requestOptions: response.requestOptions,

     

       163
       -
                 response: response,

     

       164
       -
                 type: DioExceptionType.badResponse,

     

       165
       -
                 message: 'Empty response body for "$url"',

     

       166
       -
               );

     

       167
       -
             }

     

       168
       -
       

     

       169
       -
             // Validate metadata structure

     

       170
       -
             _validateMetadata(metadata, issuer);

     

       171
       -
       

     

       172
       -
             return metadata;

     

       173
       -
           } on DioException catch (e) {

     

       174
       -
             if (e.response?.statusCode == 200) {

     

       175
       -
               // Already handled above, rethrow

     

       176
       -
               rethrow;

     

       177
       -
             }

     

       178
       -
             throw DioException(

     

       179
       -
               requestOptions: e.requestOptions,

     

       180
       -
               response: e.response,

     

       181
       -
               type: e.type,

     

       182
       -
               message:

     

       183
       -
                   'Unexpected status code ${e.response?.statusCode ?? 'unknown'} for "$url"',

     

       184
       -
               error: e.error,

     

       185
       -
             );

     

       186
       -
           }

     

       187
       -
         }

     

       188
       -
       

     

       189
       -
         /// Validates an issuer identifier.

     

       190
       -
         ///

     

       191
       -
         /// Ensures the issuer is a valid URL without query or fragment.

     

       192
       -
         /// Returns the normalized issuer.

     

       193
       -
         String _validateIssuer(String input) {

     

       194
       -
           final uri = Uri.tryParse(input);

     

       195
       -
           if (uri == null) {

     

       196
       -
             throw FormatException('Invalid issuer URL: $input');

     

       197
       -
           }

     

       198
       -
       

     

       199
       -
           // Issuer must not have query or fragment

     

       200
       -
           if (uri.hasQuery || uri.hasFragment) {

     

       201
       -
             throw FormatException(

     

       202
       -
               'Issuer URL must not contain query or fragment: $input',

     

       203
       -
             );

     

       204
       -
           }

     

       205
       -
       

     

       206
       -
           // Normalize: remove trailing slash

     

       207
       -
           final normalized =

     

       208
       -
               input.endsWith('/') ? input.substring(0, input.length - 1) : input;

     

       209
       -
       

     

       210
       -
           return normalized;

     

       211
       -
         }

     

       212
       -
       

     

       213
       -
         /// Validates authorization server metadata.

     

       214
       -
         ///

     

       215
       -
         /// Checks:

     

       216
       -
         /// - Required fields are present

     

       217
       -
         /// - Issuer matches expected value (MIX-UP attack prevention)

     

       218
       -
         /// - ATPROTO requirement: client_id_metadata_document_supported = true

     

       219
       -
         void _validateMetadata(Map<String, dynamic> metadata, String expectedIssuer) {

     

       220
       -
           // Validate issuer field (critical for security - prevents MIX-UP attacks)

     

       221
       -
           // https://datatracker.ietf.org/doc/html/draft-ietf-oauth-security-topics#name-mix-up-attacks

     

       222
       -
           // https://datatracker.ietf.org/doc/html/rfc8414#section-2

     

       223
       -
           final issuer = metadata['issuer'];

     

       224
       -
           if (issuer != expectedIssuer) {

     

       225
       -
             throw FormatException(

     

       226
       -
               'Invalid issuer: expected "$expectedIssuer", got "$issuer"',

     

       227
       -
             );

     

       228
       -
           }

     

       229
       -
       

     

       230
       -
           // ATPROTO requires client_id_metadata_document support

     

       231
       -
           // https://datatracker.ietf.org/doc/draft-ietf-oauth-client-id-metadata-document/

     

       232
       -
           final clientIdMetadataSupported =

     

       233
       -
               metadata['client_id_metadata_document_supported'];

     

       234
       -
           if (clientIdMetadataSupported != true) {

     

       235
       -
             throw FormatException(

     

       236
       -
               'Authorization server "$issuer" does not support client_id_metadata_document',

     

       237
       -
             );

     

       238
       -
           }

     

       239
       -
       

     

       240
       -
           // Validate required endpoints exist

     

       241
       -
           if (metadata['authorization_endpoint'] == null) {

     

       242
       -
             throw FormatException('Missing required field: authorization_endpoint');

     

       243
       -
           }

     

       244
       -
           if (metadata['token_endpoint'] == null) {

     

       245
       -
             throw FormatException('Missing required field: token_endpoint');

     

       246
       -
           }

     

       247
       -
         }

     

       248
       -
       }

-285

packages/atproto_oauth_flutter/lib/src/oauth/client_auth.dart

···

       1
       -
       import '../constants.dart';

     

       2
       -
       import '../errors/auth_method_unsatisfiable_error.dart';

     

       3
       -
       import '../runtime/runtime.dart';

     

       4
       -
       import '../runtime/runtime_implementation.dart';

     

       5
       -
       import '../types.dart';

     

       6
       -
       

     

       7
       -
       /// Represents a client authentication method.

     

       8
       -
       ///

     

       9
       -
       /// OAuth supports different ways for clients to authenticate with the

     

       10
       -
       /// authorization server:

     

       11
       -
       /// - 'none': Public client (no secret), only client_id

     

       12
       -
       /// - 'private_key_jwt': Confidential client using JWT signed with private key

     

       13
       -
       class ClientAuthMethod {

     

       14
       -
         final String method;

     

       15
       -
         final String? kid; // Key ID for private_key_jwt method

     

       16
       -
       

     

       17
       -
         const ClientAuthMethod.none() : method = 'none', kid = null;

     

       18
       -
       

     

       19
       -
         const ClientAuthMethod.privateKeyJwt(this.kid) : method = 'private_key_jwt';

     

       20
       -
       

     

       21
       -
         @override

     

       22
       -
         bool operator ==(Object other) {

     

       23
       -
           if (identical(this, other)) return true;

     

       24
       -
           return other is ClientAuthMethod &&

     

       25
       -
               other.method == method &&

     

       26
       -
               other.kid == kid;

     

       27
       -
         }

     

       28
       -
       

     

       29
       -
         @override

     

       30
       -
         int get hashCode => method.hashCode ^ kid.hashCode;

     

       31
       -
       

     

       32
       -
         Map<String, dynamic> toJson() {

     

       33
       -
           return {'method': method, if (kid != null) 'kid': kid};

     

       34
       -
         }

     

       35
       -
       

     

       36
       -
         factory ClientAuthMethod.fromJson(Map<String, dynamic> json) {

     

       37
       -
           final method = json['method'] as String;

     

       38
       -
           if (method == 'none') {

     

       39
       -
             return const ClientAuthMethod.none();

     

       40
       -
           } else if (method == 'private_key_jwt') {

     

       41
       -
             return ClientAuthMethod.privateKeyJwt(json['kid'] as String);

     

       42
       -
           }

     

       43
       -
           throw FormatException('Unknown auth method: $method');

     

       44
       -
         }

     

       45
       -
       }

     

       46
       -
       

     

       47
       -
       /// Credential payload to include in OAuth requests.

     

       48
       -
       class OAuthClientCredentials {

     

       49
       -
         /// Client identifier

     

       50
       -
         final String clientId;

     

       51
       -
       

     

       52
       -
         /// Client assertion type (for private_key_jwt)

     

       53
       -
         final String? clientAssertionType;

     

       54
       -
       

     

       55
       -
         /// Client assertion JWT (for private_key_jwt)

     

       56
       -
         final String? clientAssertion;

     

       57
       -
       

     

       58
       -
         const OAuthClientCredentials({

     

       59
       -
           required this.clientId,

     

       60
       -
           this.clientAssertionType,

     

       61
       -
           this.clientAssertion,

     

       62
       -
         });

     

       63
       -
       

     

       64
       -
         Map<String, dynamic> toJson() {

     

       65
       -
           final map = <String, dynamic>{'client_id': clientId};

     

       66
       -
           if (clientAssertionType != null) {

     

       67
       -
             map['client_assertion_type'] = clientAssertionType;

     

       68
       -
           }

     

       69
       -
           if (clientAssertion != null) {

     

       70
       -
             map['client_assertion'] = clientAssertion;

     

       71
       -
           }

     

       72
       -
           return map;

     

       73
       -
         }

     

       74
       -
       }

     

       75
       -
       

     

       76
       -
       /// Result of creating client credentials.

     

       77
       -
       class ClientCredentialsResult {

     

       78
       -
         /// Optional HTTP headers (e.g., Authorization header for client_secret_basic)

     

       79
       -
         final Map<String, String>? headers;

     

       80
       -
       

     

       81
       -
         /// Payload to include in the request body

     

       82
       -
         final OAuthClientCredentials payload;

     

       83
       -
       

     

       84
       -
         const ClientCredentialsResult({this.headers, required this.payload});

     

       85
       -
       }

     

       86
       -
       

     

       87
       -
       /// Factory function that creates client credentials.

     

       88
       -
       typedef ClientCredentialsFactory = Future<ClientCredentialsResult> Function();

     

       89
       -
       

     

       90
       -
       /// Negotiates the client authentication method to use.

     

       91
       -
       ///

     

       92
       -
       /// This function:

     

       93
       -
       /// 1. Checks that the server supports the client's auth method

     

       94
       -
       /// 2. For private_key_jwt, finds a suitable key from the keyset

     

       95
       -
       /// 3. Returns the negotiated auth method

     

       96
       -
       ///

     

       97
       -
       /// The ATPROTO spec requires that authorization servers support both

     

       98
       -
       /// "none" and "private_key_jwt", and clients use one or the other.

     

       99
       -
       ///

     

       100
       -
       /// Throws:

     

       101
       -
       /// - Error if server doesn't support client's auth method

     

       102
       -
       /// - Error if private_key_jwt is used but no suitable key is found

     

       103
       -
       ClientAuthMethod negotiateClientAuthMethod(

     

       104
       -
         Map<String, dynamic> serverMetadata,

     

       105
       -
         ClientMetadata clientMetadata,

     

       106
       -
         Keyset? keyset,

     

       107
       -
       ) {

     

       108
       -
         final method = clientMetadata.tokenEndpointAuthMethod;

     

       109
       -
       

     

       110
       -
         // Check that the server supports this method

     

       111
       -
         final methods = _supportedMethods(serverMetadata);

     

       112
       -
         if (!methods.contains(method)) {

     

       113
       -
           throw StateError(

     

       114
       -
             'The server does not support "$method" authentication. '

     

       115
       -
             'Supported methods are: ${methods.join(', ')}.',

     

       116
       -
           );

     

       117
       -
         }

     

       118
       -
       

     

       119
       -
         if (method == 'private_key_jwt') {

     

       120
       -
           // Invalid client configuration

     

       121
       -
           if (keyset == null) {

     

       122
       -
             throw StateError('A keyset is required for private_key_jwt');

     

       123
       -
           }

     

       124
       -
       

     

       125
       -
           final algs = _supportedAlgs(serverMetadata);

     

       126
       -
       

     

       127
       -
           // Find a suitable key

     

       128
       -
           // We can't use keyset.findPrivateKey here because we need to ensure

     

       129
       -
           // the key has a "kid" property (required for JWT headers)

     

       130
       -
           for (final key in keyset.keys) {

     

       131
       -
             if (key.kid != null &&

     

       132
       -
                 key.usage == 'sign' &&

     

       133
       -
                 key.algorithms.any((a) => algs.contains(a))) {

     

       134
       -
               return ClientAuthMethod.privateKeyJwt(key.kid!);

     

       135
       -
             }

     

       136
       -
           }

     

       137
       -
       

     

       138
       -
           throw StateError(

     

       139
       -
             algs.contains(fallbackAlg)

     

       140
       -
                 ? 'Client authentication method "$method" requires at least one "$fallbackAlg" signing key with a "kid" property'

     

       141
       -
                 : 'Authorization server requires "$method" authentication method, but does not support "$fallbackAlg" algorithm.',

     

       142
       -
           );

     

       143
       -
         }

     

       144
       -
       

     

       145
       -
         if (method == 'none') {

     

       146
       -
           return const ClientAuthMethod.none();

     

       147
       -
         }

     

       148
       -
       

     

       149
       -
         throw StateError(

     

       150
       -
           'The ATProto OAuth spec requires that client use either "none" or "private_key_jwt" authentication method.' +

     

       151
       -
               (method == 'client_secret_basic'

     

       152
       -
                   ? ' You might want to explicitly set "token_endpoint_auth_method" to one of those values in the client metadata document.'

     

       153
       -
                   : ' You set "$method" which is not allowed.'),

     

       154
       -
         );

     

       155
       -
       }

     

       156
       -
       

     

       157
       -
       /// Creates a factory that generates client credentials.

     

       158
       -
       ///

     

       159
       -
       /// The factory can be called multiple times to generate fresh credentials

     

       160
       -
       /// (important for private_key_jwt which includes timestamps).

     

       161
       -
       ///

     

       162
       -
       /// Throws [AuthMethodUnsatisfiableError] if:

     

       163
       -
       /// - Server no longer supports the auth method

     

       164
       -
       /// - Key is no longer available in the keyset

     

       165
       -
       ClientCredentialsFactory createClientCredentialsFactory(

     

       166
       -
         ClientAuthMethod authMethod,

     

       167
       -
         Map<String, dynamic> serverMetadata,

     

       168
       -
         ClientMetadata clientMetadata,

     

       169
       -
         Runtime runtime,

     

       170
       -
         Keyset? keyset,

     

       171
       -
       ) {

     

       172
       -
         // Ensure the AS still supports the auth method

     

       173
       -
         if (!_supportedMethods(serverMetadata).contains(authMethod.method)) {

     

       174
       -
           throw AuthMethodUnsatisfiableError(

     

       175
       -
             'Client authentication method "${authMethod.method}" no longer supported',

     

       176
       -
           );

     

       177
       -
         }

     

       178
       -
       

     

       179
       -
         if (authMethod.method == 'none') {

     

       180
       -
           return () async => ClientCredentialsResult(

     

       181
       -
             payload: OAuthClientCredentials(clientId: clientMetadata.clientId!),

     

       182
       -
           );

     

       183
       -
         }

     

       184
       -
       

     

       185
       -
         if (authMethod.method == 'private_key_jwt') {

     

       186
       -
           try {

     

       187
       -
             // Find the key

     

       188
       -
             if (keyset == null) {

     

       189
       -
               throw StateError('A keyset is required for private_key_jwt');

     

       190
       -
             }

     

       191
       -
       

     

       192
       -
             final key = keyset.keys.firstWhere(

     

       193
       -
               (k) =>

     

       194
       -
                   k.kid == authMethod.kid &&

     

       195
       -
                   k.usage == 'sign' &&

     

       196
       -
                   k.algorithms.any((a) => _supportedAlgs(serverMetadata).contains(a)),

     

       197
       -
               orElse: () => throw StateError('Key not found: ${authMethod.kid}'),

     

       198
       -
             );

     

       199
       -
       

     

       200
       -
             final alg = key.algorithms.firstWhere(

     

       201
       -
               (a) => _supportedAlgs(serverMetadata).contains(a),

     

       202
       -
               orElse: () => throw StateError('No supported algorithm found'),

     

       203
       -
             );

     

       204
       -
       

     

       205
       -
             // https://www.rfc-editor.org/rfc/rfc7523.html#section-3

     

       206
       -
             return () async {

     

       207
       -
               final jti = await runtime.generateNonce();

     

       208
       -
               final now = DateTime.now().millisecondsSinceEpoch ~/ 1000;

     

       209
       -
       

     

       210
       -
               final jwt = await key.createJwt(

     

       211
       -
                 {'alg': alg},

     

       212
       -
                 {

     

       213
       -
                   // Issuer: the client_id

     

       214
       -
                   'iss': clientMetadata.clientId,

     

       215
       -
                   // Subject: the client_id

     

       216
       -
                   'sub': clientMetadata.clientId,

     

       217
       -
                   // Audience: the authorization server

     

       218
       -
                   'aud': serverMetadata['issuer'],

     

       219
       -
                   // JWT ID: unique identifier

     

       220
       -
                   'jti': jti,

     

       221
       -
                   // Issued at

     

       222
       -
                   'iat': now,

     

       223
       -
                   // Expiration: 1 minute from now

     

       224
       -
                   'exp': now + 60,

     

       225
       -
                 },

     

       226
       -
               );

     

       227
       -
       

     

       228
       -
               return ClientCredentialsResult(

     

       229
       -
                 payload: OAuthClientCredentials(

     

       230
       -
                   clientId: clientMetadata.clientId!,

     

       231
       -
                   clientAssertionType:

     

       232
       -
                       'urn:ietf:params:oauth:client-assertion-type:jwt-bearer',

     

       233
       -
                   clientAssertion: jwt,

     

       234
       -
                 ),

     

       235
       -
               );

     

       236
       -
             };

     

       237
       -
           } catch (cause) {

     

       238
       -
             throw AuthMethodUnsatisfiableError('Failed to load private key: $cause');

     

       239
       -
           }

     

       240
       -
         }

     

       241
       -
       

     

       242
       -
         throw AuthMethodUnsatisfiableError(

     

       243
       -
           'Unsupported auth method: ${authMethod.method}',

     

       244
       -
         );

     

       245
       -
       }

     

       246
       -
       

     

       247
       -
       /// Gets the list of supported authentication methods from server metadata.

     

       248
       -
       List<String> _supportedMethods(Map<String, dynamic> serverMetadata) {

     

       249
       -
         final methods = serverMetadata['token_endpoint_auth_methods_supported'];

     

       250
       -
         if (methods is List) {

     

       251
       -
           return methods.map((m) => m.toString()).toList();

     

       252
       -
         }

     

       253
       -
         return [];

     

       254
       -
       }

     

       255
       -
       

     

       256
       -
       /// Gets the list of supported signing algorithms from server metadata.

     

       257
       -
       List<String> _supportedAlgs(Map<String, dynamic> serverMetadata) {

     

       258
       -
         final algs =

     

       259
       -
             serverMetadata['token_endpoint_auth_signing_alg_values_supported'];

     

       260
       -
         if (algs is List) {

     

       261
       -
           return algs.map((a) => a.toString()).toList();

     

       262
       -
         }

     

       263
       -
       

     

       264
       -
         // Default to ES256 as prescribed by the ATProto spec:

     

       265
       -
         // > Clients and Authorization Servers currently must support the ES256

     

       266
       -
         // > cryptographic system [for client authentication].

     

       267
       -
         // https://atproto.com/specs/oauth#confidential-client-authentication

     

       268
       -
         return [fallbackAlg];

     

       269
       -
       }

     

       270
       -
       

     

       271
       -
       /// Placeholder for Keyset class.

     

       272
       -
       ///

     

       273
       -
       /// In the full implementation, this would come from @atproto/jwk package.

     

       274
       -
       /// For now, we use a simple implementation.

     

       275
       -
       class Keyset {

     

       276
       -
         final List<Key> keys;

     

       277
       -
       

     

       278
       -
         const Keyset(this.keys);

     

       279
       -
       

     

       280
       -
         int get size => keys.length;

     

       281
       -
       

     

       282
       -
         Map<String, dynamic> toJSON() {

     

       283
       -
           return {'keys': keys.map((k) => k.bareJwk).toList()};

     

       284
       -
         }

     

       285
       -
       }

-307

packages/atproto_oauth_flutter/lib/src/oauth/oauth_resolver.dart

···

       1
       -
       import '../errors/oauth_resolver_error.dart';

     

       2
       -
       import '../identity/did_document.dart';

     

       3
       -
       import '../identity/identity_resolver.dart';

     

       4
       -
       import 'authorization_server_metadata_resolver.dart';

     

       5
       -
       import 'protected_resource_metadata_resolver.dart';

     

       6
       -
       

     

       7
       -
       /// Complete result of OAuth resolution from an identity.

     

       8
       -
       class ResolvedOAuthIdentityFromIdentity {

     

       9
       -
         /// The resolved identity information

     

       10
       -
         final IdentityInfo identityInfo;

     

       11
       -
       

     

       12
       -
         /// The authorization server metadata

     

       13
       -
         final Map<String, dynamic> metadata;

     

       14
       -
       

     

       15
       -
         /// The PDS URL

     

       16
       -
         final Uri pds;

     

       17
       -
       

     

       18
       -
         const ResolvedOAuthIdentityFromIdentity({

     

       19
       -
           required this.identityInfo,

     

       20
       -
           required this.metadata,

     

       21
       -
           required this.pds,

     

       22
       -
         });

     

       23
       -
       }

     

       24
       -
       

     

       25
       -
       /// Result of OAuth resolution from a service URL.

     

       26
       -
       class ResolvedOAuthIdentityFromService {

     

       27
       -
         /// The authorization server metadata

     

       28
       -
         final Map<String, dynamic> metadata;

     

       29
       -
       

     

       30
       -
         /// Optional identity info (only present if resolved from handle/DID)

     

       31
       -
         final IdentityInfo? identityInfo;

     

       32
       -
       

     

       33
       -
         const ResolvedOAuthIdentityFromService({

     

       34
       -
           required this.metadata,

     

       35
       -
           this.identityInfo,

     

       36
       -
         });

     

       37
       -
       }

     

       38
       -
       

     

       39
       -
       /// Options for OAuth resolution.

     

       40
       -
       typedef ResolveOAuthOptions = GetCachedOptions;

     

       41
       -
       

     

       42
       -
       /// Main OAuth resolver that combines identity and metadata resolution.

     

       43
       -
       ///

     

       44
       -
       /// This class orchestrates the complete OAuth discovery flow:

     

       45
       -
       ///

     

       46
       -
       /// 1. **From handle/DID** (resolveFromIdentity):

     

       47
       -
       ///    - Resolve handle → DID (if needed)

     

       48
       -
       ///    - Fetch DID document

     

       49
       -
       ///    - Extract PDS URL from DID document

     

       50
       -
       ///    - Fetch protected resource metadata from PDS

     

       51
       -
       ///    - Extract authorization server(s) from resource metadata

     

       52
       -
       ///    - Fetch authorization server metadata

     

       53
       -
       ///    - Verify PDS is protected by the authorization server

     

       54
       -
       ///

     

       55
       -
       /// 2. **From URL** (resolveFromService):

     

       56
       -
       ///    - Try as PDS URL (fetch protected resource metadata)

     

       57
       -
       ///    - Extract authorization server from metadata

     

       58
       -
       ///    - Fallback: try as authorization server directly

     

       59
       -
       ///

     

       60
       -
       /// This is the critical piece that enables decentralization - users can

     

       61
       -
       /// host their data on any PDS, and we discover the OAuth server dynamically.

     

       62
       -
       class OAuthResolver {

     

       63
       -
         final IdentityResolver identityResolver;

     

       64
       -
         final OAuthProtectedResourceMetadataResolver

     

       65
       -
         protectedResourceMetadataResolver;

     

       66
       -
         final OAuthAuthorizationServerMetadataResolver

     

       67
       -
         authorizationServerMetadataResolver;

     

       68
       -
       

     

       69
       -
         OAuthResolver({

     

       70
       -
           required this.identityResolver,

     

       71
       -
           required this.protectedResourceMetadataResolver,

     

       72
       -
           required this.authorizationServerMetadataResolver,

     

       73
       -
         });

     

       74
       -
       

     

       75
       -
         /// Resolves OAuth metadata from an input (handle, DID, or URL).

     

       76
       -
         ///

     

       77
       -
         /// The [input] can be:

     

       78
       -
         /// - An atProto handle (e.g., "alice.bsky.social")

     

       79
       -
         /// - A DID (e.g., "did:plc:...")

     

       80
       -
         /// - A PDS URL (e.g., "https://pds.example.com")

     

       81
       -
         /// - An authorization server URL (e.g., "https://auth.example.com")

     

       82
       -
         ///

     

       83
       -
         /// Returns metadata for the authorization server. The identityInfo

     

       84
       -
         /// is only present if input was a handle or DID.

     

       85
       -
         Future<ResolvedOAuthIdentityFromService> resolve(

     

       86
       -
           String input, [

     

       87
       -
           ResolveOAuthOptions? options,

     

       88
       -
         ]) async {

     

       89
       -
           // Detect if input is a URL (starts with http:// or https://)

     

       90
       -
           if (RegExp(r'^https?://').hasMatch(input)) {

     

       91
       -
             return resolveFromService(input, options);

     

       92
       -
           } else {

     

       93
       -
             final result = await resolveFromIdentity(input, options);

     

       94
       -
             return ResolvedOAuthIdentityFromService(

     

       95
       -
               metadata: result.metadata,

     

       96
       -
               identityInfo: result.identityInfo,

     

       97
       -
             );

     

       98
       -
           }

     

       99
       -
         }

     

       100
       -
       

     

       101
       -
         /// Resolves OAuth metadata from a service URL (PDS or authorization server).

     

       102
       -
         ///

     

       103
       -
         /// This method:

     

       104
       -
         /// 1. First tries to resolve as a PDS (protected resource)

     

       105
       -
         /// 2. If that fails, tries to resolve as an authorization server directly

     

       106
       -
         ///

     

       107
       -
         /// This allows both "login with PDS URL" and "login with auth server URL"

     

       108
       -
         /// flows, useful when users forget their handle or for compatibility.

     

       109
       -
         Future<ResolvedOAuthIdentityFromService> resolveFromService(

     

       110
       -
           String input, [

     

       111
       -
           ResolveOAuthOptions? options,

     

       112
       -
         ]) async {

     

       113
       -
           try {

     

       114
       -
             // Assume first that input is a PDS URL (as required by ATPROTO)

     

       115
       -
             final metadata = await getResourceServerMetadata(input, options);

     

       116
       -
             return ResolvedOAuthIdentityFromService(metadata: metadata);

     

       117
       -
           } catch (err) {

     

       118
       -
             // Check if request was cancelled - note: Dio's CancelToken doesn't have throwIfCanceled()

     

       119
       -
             // We rely on Dio throwing CancelError automatically

     

       120
       -
       

     

       121
       -
             if (err is OAuthResolverError) {

     

       122
       -
               try {

     

       123
       -
                 // Fallback to trying to fetch as an issuer (Entryway/Authorization Server)

     

       124
       -
                 final issuerUri = Uri.tryParse(input);

     

       125
       -
                 if (issuerUri != null && issuerUri.hasScheme) {

     

       126
       -
                   final metadata = await getAuthorizationServerMetadata(

     

       127
       -
                     input,

     

       128
       -
                     options,

     

       129
       -
                   );

     

       130
       -
                   return ResolvedOAuthIdentityFromService(metadata: metadata);

     

       131
       -
                 }

     

       132
       -
               } catch (_) {

     

       133
       -
                 // Fallback failed, throw original error

     

       134
       -
               }

     

       135
       -
             }

     

       136
       -
       

     

       137
       -
             rethrow;

     

       138
       -
           }

     

       139
       -
         }

     

       140
       -
       

     

       141
       -
         /// Resolves OAuth metadata from a handle or DID.

     

       142
       -
         ///

     

       143
       -
         /// This is the primary OAuth discovery flow:

     

       144
       -
         /// 1. Resolve handle → DID → DID document (via IdentityResolver)

     

       145
       -
         /// 2. Extract PDS URL from DID document

     

       146
       -
         /// 3. Get protected resource metadata from PDS

     

       147
       -
         /// 4. Extract authorization server(s)

     

       148
       -
         /// 5. Get authorization server metadata

     

       149
       -
         /// 6. Verify PDS is protected by the auth server

     

       150
       -
         Future<ResolvedOAuthIdentityFromIdentity> resolveFromIdentity(

     

       151
       -
           String input, [

     

       152
       -
           ResolveOAuthOptions? options,

     

       153
       -
         ]) async {

     

       154
       -
           final identityInfo = await resolveIdentity(

     

       155
       -
             input,

     

       156
       -
             options != null

     

       157
       -
                 ? ResolveIdentityOptions(

     

       158
       -
                   noCache: options.noCache,

     

       159
       -
                   cancelToken: options.cancelToken,

     

       160
       -
                 )

     

       161
       -
                 : null,

     

       162
       -
           );

     

       163
       -
       

     

       164
       -
           final pds = _extractPdsUrl(identityInfo.didDoc);

     

       165
       -
       

     

       166
       -
           final metadata = await getResourceServerMetadata(pds, options);

     

       167
       -
       

     

       168
       -
           return ResolvedOAuthIdentityFromIdentity(

     

       169
       -
             identityInfo: identityInfo,

     

       170
       -
             metadata: metadata,

     

       171
       -
             pds: pds,

     

       172
       -
           );

     

       173
       -
         }

     

       174
       -
       

     

       175
       -
         /// Resolves an identity (handle or DID) to IdentityInfo.

     

       176
       -
         ///

     

       177
       -
         /// Wraps the IdentityResolver with proper error handling.

     

       178
       -
         Future<IdentityInfo> resolveIdentity(

     

       179
       -
           String input, [

     

       180
       -
           ResolveIdentityOptions? options,

     

       181
       -
         ]) async {

     

       182
       -
           try {

     

       183
       -
             return await identityResolver.resolve(input, options);

     

       184
       -
           } catch (cause) {

     

       185
       -
             throw OAuthResolverError.from(

     

       186
       -
               cause,

     

       187
       -
               'Failed to resolve identity: $input',

     

       188
       -
             );

     

       189
       -
           }

     

       190
       -
         }

     

       191
       -
       

     

       192
       -
         /// Gets authorization server metadata for an issuer.

     

       193
       -
         ///

     

       194
       -
         /// Wraps the AuthorizationServerMetadataResolver with proper error handling.

     

       195
       -
         Future<Map<String, dynamic>> getAuthorizationServerMetadata(

     

       196
       -
           String issuer, [

     

       197
       -
           GetCachedOptions? options,

     

       198
       -
         ]) async {

     

       199
       -
           try {

     

       200
       -
             return await authorizationServerMetadataResolver.get(issuer, options);

     

       201
       -
           } catch (cause) {

     

       202
       -
             throw OAuthResolverError.from(

     

       203
       -
               cause,

     

       204
       -
               'Failed to resolve OAuth server metadata for issuer: $issuer',

     

       205
       -
             );

     

       206
       -
           }

     

       207
       -
         }

     

       208
       -
       

     

       209
       -
         /// Gets authorization server metadata for a protected resource (PDS).

     

       210
       -
         ///

     

       211
       -
         /// This method:

     

       212
       -
         /// 1. Fetches protected resource metadata

     

       213
       -
         /// 2. Validates exactly one authorization server is listed (ATPROTO requirement)

     

       214
       -
         /// 3. Fetches authorization server metadata

     

       215
       -
         /// 4. Verifies the PDS is in the auth server's protected_resources list

     

       216
       -
         Future<Map<String, dynamic>> getResourceServerMetadata(

     

       217
       -
           dynamic pdsUrl, [

     

       218
       -
           GetCachedOptions? options,

     

       219
       -
         ]) async {

     

       220
       -
           try {

     

       221
       -
             final rsMetadata = await protectedResourceMetadataResolver.get(

     

       222
       -
               pdsUrl,

     

       223
       -
               options,

     

       224
       -
             );

     

       225
       -
       

     

       226
       -
             // ATPROTO requires exactly one authorization server

     

       227
       -
             final authServers = rsMetadata['authorization_servers'];

     

       228
       -
             if (authServers is! List || authServers.length != 1) {

     

       229
       -
               throw OAuthResolverError(

     

       230
       -
                 authServers == null || (authServers as List).isEmpty

     

       231
       -
                     ? 'No authorization servers found for PDS: $pdsUrl'

     

       232
       -
                     : 'Unable to determine authorization server for PDS: $pdsUrl',

     

       233
       -
               );

     

       234
       -
             }

     

       235
       -
       

     

       236
       -
             final issuer = authServers[0] as String;

     

       237
       -
       

     

       238
       -
             final asMetadata = await getAuthorizationServerMetadata(issuer, options);

     

       239
       -
       

     

       240
       -
             // Verify PDS is protected by this authorization server

     

       241
       -
             // https://www.rfc-editor.org/rfc/rfc9728.html#section-4

     

       242
       -
             final protectedResources = asMetadata['protected_resources'];

     

       243
       -
             if (protectedResources != null) {

     

       244
       -
               final resource = rsMetadata['resource'] as String;

     

       245
       -
               if (!(protectedResources as List).contains(resource)) {

     

       246
       -
                 throw OAuthResolverError(

     

       247
       -
                   'PDS "$pdsUrl" not protected by issuer "$issuer"',

     

       248
       -
                 );

     

       249
       -
               }

     

       250
       -
             }

     

       251
       -
       

     

       252
       -
             return asMetadata;

     

       253
       -
           } catch (cause) {

     

       254
       -
             throw OAuthResolverError.from(

     

       255
       -
               cause,

     

       256
       -
               'Failed to resolve OAuth server metadata for resource: $pdsUrl',

     

       257
       -
             );

     

       258
       -
           }

     

       259
       -
         }

     

       260
       -
       

     

       261
       -
         /// Extracts the PDS URL from a DID document.

     

       262
       -
         ///

     

       263
       -
         /// Throws OAuthResolverError if no PDS URL is found.

     

       264
       -
         Uri _extractPdsUrl(DidDocument document) {

     

       265
       -
           // Find the atproto_pds service

     

       266
       -
           final service = document.service?.firstWhere(

     

       267
       -
             (s) => _isAtprotoPersonalDataServerService(s, document),

     

       268
       -
             orElse:

     

       269
       -
                 () =>

     

       270
       -
                     throw OAuthResolverError(

     

       271
       -
                       'Identity "${document.id}" does not have a PDS URL',

     

       272
       -
                     ),

     

       273
       -
           );

     

       274
       -
       

     

       275
       -
           if (service == null) {

     

       276
       -
             throw OAuthResolverError(

     

       277
       -
               'Identity "${document.id}" does not have a PDS URL',

     

       278
       -
             );

     

       279
       -
           }

     

       280
       -
       

     

       281
       -
           try {

     

       282
       -
             return Uri.parse(service.serviceEndpoint as String);

     

       283
       -
           } catch (cause) {

     

       284
       -
             throw OAuthResolverError(

     

       285
       -
               'Invalid PDS URL in DID document: ${service.serviceEndpoint}',

     

       286
       -
               cause: cause,

     

       287
       -
             );

     

       288
       -
           }

     

       289
       -
         }

     

       290
       -
       

     

       291
       -
         /// Checks if a service is an AtprotoPersonalDataServer.

     

       292
       -
         bool _isAtprotoPersonalDataServerService(

     

       293
       -
           DidService service,

     

       294
       -
           DidDocument document,

     

       295
       -
         ) {

     

       296
       -
           if (service.serviceEndpoint is! String) return false;

     

       297
       -
           if (service.type != 'AtprotoPersonalDataServer') return false;

     

       298
       -
       

     

       299
       -
           // Check service ID

     

       300
       -
           final id = service.id;

     

       301
       -
           if (id.startsWith('#')) {

     

       302
       -
             return id == '#atproto_pds';

     

       303
       -
           } else {

     

       304
       -
             return id == '${document.id}#atproto_pds';

     

       305
       -
           }

     

       306
       -
         }

     

       307
       -
       }

-519

packages/atproto_oauth_flutter/lib/src/oauth/oauth_server_agent.dart

···

       1
       -
       import 'package:dio/dio.dart';

     

       2
       -
       import 'package:flutter/foundation.dart' hide Key;

     

       3
       -
       

     

       4
       -
       import '../dpop/fetch_dpop.dart';

     

       5
       -
       import '../errors/oauth_response_error.dart';

     

       6
       -
       import '../errors/token_refresh_error.dart';

     

       7
       -
       import '../runtime/runtime.dart';

     

       8
       -
       import '../runtime/runtime_implementation.dart';

     

       9
       -
       import '../types.dart';

     

       10
       -
       import 'authorization_server_metadata_resolver.dart' show GetCachedOptions;

     

       11
       -
       import 'client_auth.dart';

     

       12
       -
       import 'oauth_resolver.dart';

     

       13
       -
       

     

       14
       -
       /// Represents a token set returned from OAuth token endpoint.

     

       15
       -
       class TokenSet {

     

       16
       -
         /// Issuer (authorization server URL)

     

       17
       -
         final String iss;

     

       18
       -
       

     

       19
       -
         /// Subject (DID of the user)

     

       20
       -
         final String sub;

     

       21
       -
       

     

       22
       -
         /// Audience (PDS URL)

     

       23
       -
         final String aud;

     

       24
       -
       

     

       25
       -
         /// Scope (space-separated list of scopes)

     

       26
       -
         final String scope;

     

       27
       -
       

     

       28
       -
         /// Refresh token (optional)

     

       29
       -
         final String? refreshToken;

     

       30
       -
       

     

       31
       -
         /// Access token

     

       32
       -
         final String accessToken;

     

       33
       -
       

     

       34
       -
         /// Token type (must be "DPoP" for ATPROTO)

     

       35
       -
         final String tokenType;

     

       36
       -
       

     

       37
       -
         /// Expiration time (ISO date string)

     

       38
       -
         final String? expiresAt;

     

       39
       -
       

     

       40
       -
         const TokenSet({

     

       41
       -
           required this.iss,

     

       42
       -
           required this.sub,

     

       43
       -
           required this.aud,

     

       44
       -
           required this.scope,

     

       45
       -
           this.refreshToken,

     

       46
       -
           required this.accessToken,

     

       47
       -
           required this.tokenType,

     

       48
       -
           this.expiresAt,

     

       49
       -
         });

     

       50
       -
       

     

       51
       -
         Map<String, dynamic> toJson() {

     

       52
       -
           return {

     

       53
       -
             'iss': iss,

     

       54
       -
             'sub': sub,

     

       55
       -
             'aud': aud,

     

       56
       -
             'scope': scope,

     

       57
       -
             if (refreshToken != null) 'refresh_token': refreshToken,

     

       58
       -
             'access_token': accessToken,

     

       59
       -
             'token_type': tokenType,

     

       60
       -
             if (expiresAt != null) 'expires_at': expiresAt,

     

       61
       -
           };

     

       62
       -
         }

     

       63
       -
       

     

       64
       -
         factory TokenSet.fromJson(Map<String, dynamic> json) {

     

       65
       -
           return TokenSet(

     

       66
       -
             iss: json['iss'] as String,

     

       67
       -
             sub: json['sub'] as String,

     

       68
       -
             aud: json['aud'] as String,

     

       69
       -
             scope: json['scope'] as String,

     

       70
       -
             refreshToken: json['refresh_token'] as String?,

     

       71
       -
             accessToken: json['access_token'] as String,

     

       72
       -
             tokenType: json['token_type'] as String,

     

       73
       -
             expiresAt: json['expires_at'] as String?,

     

       74
       -
           );

     

       75
       -
         }

     

       76
       -
       }

     

       77
       -
       

     

       78
       -
       /// DPoP nonce cache type.

     

       79
       -
       typedef DpopNonceCache = SimpleStore<String, String>;

     

       80
       -
       

     

       81
       -
       /// Agent for interacting with an OAuth authorization server.

     

       82
       -
       ///

     

       83
       -
       /// This class handles:

     

       84
       -
       /// - Token exchange (authorization code → tokens)

     

       85
       -
       /// - Token refresh (refresh token → new tokens)

     

       86
       -
       /// - Token revocation

     

       87
       -
       /// - DPoP proof generation and nonce management

     

       88
       -
       /// - Client authentication

     

       89
       -
       ///

     

       90
       -
       /// All token requests include DPoP proofs to bind tokens to keys.

     

       91
       -
       class OAuthServerAgent {

     

       92
       -
         final ClientAuthMethod authMethod;

     

       93
       -
         final Key dpopKey;

     

       94
       -
         final Map<String, dynamic> serverMetadata;

     

       95
       -
         final ClientMetadata clientMetadata;

     

       96
       -
         final DpopNonceCache dpopNonces;

     

       97
       -
         final OAuthResolver oauthResolver;

     

       98
       -
         final Runtime runtime;

     

       99
       -
         final Keyset? keyset;

     

       100
       -
         final Dio _dio;

     

       101
       -
         final ClientCredentialsFactory _clientCredentialsFactory;

     

       102
       -
       

     

       103
       -
         /// Creates an OAuth server agent.

     

       104
       -
         ///

     

       105
       -
         /// Throws [AuthMethodUnsatisfiableError] if the auth method cannot be satisfied.

     

       106
       -
         OAuthServerAgent({

     

       107
       -
           required this.authMethod,

     

       108
       -
           required this.dpopKey,

     

       109
       -
           required this.serverMetadata,

     

       110
       -
           required this.clientMetadata,

     

       111
       -
           required this.dpopNonces,

     

       112
       -
           required this.oauthResolver,

     

       113
       -
           required this.runtime,

     

       114
       -
           this.keyset,

     

       115
       -
           Dio? dio,

     

       116
       -
         }) : // CRITICAL: Always create a NEW Dio instance to avoid duplicate interceptors

     

       117
       -
              // If we reuse a shared Dio instance, each OAuthServerAgent will add its

     

       118
       -
              // interceptors to the same instance, causing duplicate requests!

     

       119
       -
              _dio = Dio(dio?.options ?? BaseOptions()),

     

       120
       -
              _clientCredentialsFactory = createClientCredentialsFactory(

     

       121
       -
                authMethod,

     

       122
       -
                serverMetadata,

     

       123
       -
                clientMetadata,

     

       124
       -
                runtime,

     

       125
       -
                keyset,

     

       126
       -
              ) {

     

       127
       -
           // Add debug logging interceptor (runs before DPoP interceptor)

     

       128
       -
           if (kDebugMode) {

     

       129
       -
             _dio.interceptors.add(

     

       130
       -
               InterceptorsWrapper(

     

       131
       -
                 onRequest: (options, handler) {

     

       132
       -
                   if (options.uri.path.contains('/token')) {

     

       133
       -
                     print(

     

       134
       -
                       '📤 [BEFORE DPoP] Request headers: ${options.headers.keys.toList()}',

     

       135
       -
                     );

     

       136
       -
                   }

     

       137
       -
                   handler.next(options);

     

       138
       -
                 },

     

       139
       -
               ),

     

       140
       -
             );

     

       141
       -
           }

     

       142
       -
       

     

       143
       -
           // Add DPoP interceptor

     

       144
       -
           _dio.interceptors.add(

     

       145
       -
             createDpopInterceptor(

     

       146
       -
               DpopFetchWrapperOptions(

     

       147
       -
                 key: dpopKey,

     

       148
       -
                 nonces: dpopNonces,

     

       149
       -
                 sha256: runtime.sha256,

     

       150
       -
                 isAuthServer: true,

     

       151
       -
               ),

     

       152
       -
             ),

     

       153
       -
           );

     

       154
       -
       

     

       155
       -
           // Add final logging interceptor (runs after DPoP interceptor)

     

       156
       -
           if (kDebugMode) {

     

       157
       -
             _dio.interceptors.add(

     

       158
       -
               InterceptorsWrapper(

     

       159
       -
                 onRequest: (options, handler) {

     

       160
       -
                   if (options.uri.path.contains('/token')) {

     

       161
       -
                     print(

     

       162
       -
                       '📤 [AFTER DPoP] Request headers: ${options.headers.keys.toList()}',

     

       163
       -
                     );

     

       164
       -
                     if (options.headers.containsKey('dpop')) {

     

       165
       -
                       print(

     

       166
       -
                         '   DPoP header present: ${options.headers['dpop']?.toString().substring(0, 50)}...',

     

       167
       -
                       );

     

       168
       -
                     } else if (options.headers.containsKey('DPoP')) {

     

       169
       -
                       print(

     

       170
       -
                         '   DPoP header present: ${options.headers['DPoP']?.toString().substring(0, 50)}...',

     

       171
       -
                       );

     

       172
       -
                     } else {

     

       173
       -
                       print('   ⚠️ DPoP header MISSING!');

     

       174
       -
                     }

     

       175
       -
                   }

     

       176
       -
                   handler.next(options);

     

       177
       -
                 },

     

       178
       -
                 onError: (error, handler) {

     

       179
       -
                   if (error.requestOptions.uri.path.contains('/token')) {

     

       180
       -
                     print('📥 Token request error: ${error.message}');

     

       181
       -
                   }

     

       182
       -
                   handler.next(error);

     

       183
       -
                 },

     

       184
       -
               ),

     

       185
       -
             );

     

       186
       -
           }

     

       187
       -
         }

     

       188
       -
       

     

       189
       -
         /// The issuer (authorization server URL).

     

       190
       -
         String get issuer => serverMetadata['issuer'] as String;

     

       191
       -
       

     

       192
       -
         /// Revokes a token.

     

       193
       -
         ///

     

       194
       -
         /// Errors are silently ignored as revocation is best-effort.

     

       195
       -
         Future<void> revoke(String token) async {

     

       196
       -
           try {

     

       197
       -
             await _request('revocation', {'token': token});

     

       198
       -
           } catch (_) {

     

       199
       -
             // Don't care if revocation fails

     

       200
       -
           }

     

       201
       -
         }

     

       202
       -
       

     

       203
       -
         /// Pre-fetches a DPoP nonce from the token endpoint.

     

       204
       -
         ///

     

       205
       -
         /// This is critical for authorization code exchange because:

     

       206
       -
         /// 1. First token request without nonce → PDS consumes code + returns use_dpop_nonce error

     

       207
       -
         /// 2. Retry with nonce → "Invalid code" because already consumed

     

       208
       -
         ///

     

       209
       -
         /// Solution: Get a nonce BEFORE attempting code exchange.

     

       210
       -
         ///

     

       211
       -
         /// We make a lightweight invalid request that will fail but return a nonce.

     

       212
       -
         /// The server responds with a nonce in the DPoP-Nonce header, which the

     

       213
       -
         /// interceptor automatically caches for subsequent requests.

     

       214
       -
         Future<void> _prefetchDpopNonce() async {

     

       215
       -
           final tokenEndpoint = serverMetadata['token_endpoint'] as String?;

     

       216
       -
           if (tokenEndpoint == null) return;

     

       217
       -
       

     

       218
       -
           final origin = Uri.parse(tokenEndpoint);

     

       219
       -
           final originKey =

     

       220
       -
               '${origin.scheme}://${origin.host}${origin.hasPort ? ':${origin.port}' : ''}';

     

       221
       -
       

     

       222
       -
           // Clear any stale nonce from previous sessions

     

       223
       -
           try {

     

       224
       -
             await dpopNonces.del(originKey);

     

       225
       -
             if (kDebugMode) {

     

       226
       -
               print('🧹 Cleared stale DPoP nonce from cache');

     

       227
       -
             }

     

       228
       -
           } catch (_) {

     

       229
       -
             // Ignore deletion errors

     

       230
       -
           }

     

       231
       -
       

     

       232
       -
           if (kDebugMode) {

     

       233
       -
             print('⏱️  Pre-fetch starting at: ${DateTime.now().toIso8601String()}');

     

       234
       -
           }

     

       235
       -
       

     

       236
       -
           try {

     

       237
       -
             // Make a minimal invalid request to trigger nonce response

     

       238
       -
             // Use an invalid grant_type that will fail fast without side effects

     

       239
       -
             await _dio.post<Map<String, dynamic>>(

     

       240
       -
               tokenEndpoint,

     

       241
       -
               data: 'grant_type=invalid_prefetch',

     

       242
       -
               options: Options(

     

       243
       -
                 headers: {'Content-Type': 'application/x-www-form-urlencoded'},

     

       244
       -
                 validateStatus: (status) => true, // Accept any status

     

       245
       -
               ),

     

       246
       -
             );

     

       247
       -
           } catch (_) {

     

       248
       -
             // Ignore all errors - we just want the nonce from the response headers

     

       249
       -
             // The DPoP interceptor will have cached it in onError or onResponse

     

       250
       -
           }

     

       251
       -
       

     

       252
       -
           if (kDebugMode) {

     

       253
       -
             print('⏱️  Pre-fetch completed at: ${DateTime.now().toIso8601String()}');

     

       254
       -
             final cachedNonce = await dpopNonces.get(originKey);

     

       255
       -
             print('🎫 DPoP nonce pre-fetch result:');

     

       256
       -
             print(

     

       257
       -
               '   Cached nonce: ${cachedNonce != null ? "✅ ${cachedNonce.substring(0, 20)}..." : "❌ not found"}',

     

       258
       -
             );

     

       259
       -
           }

     

       260
       -
         }

     

       261
       -
       

     

       262
       -
         /// Exchanges an authorization code for tokens.

     

       263
       -
         ///

     

       264
       -
         /// This is called after the user completes authorization and you receive

     

       265
       -
         /// the authorization code in the callback.

     

       266
       -
         ///

     

       267
       -
         /// [code] is the authorization code from the callback.

     

       268
       -
         /// [codeVerifier] is the PKCE code verifier (if PKCE was used).

     

       269
       -
         /// [redirectUri] is the redirect URI used in the authorization request.

     

       270
       -
         ///

     

       271
       -
         /// Returns a [TokenSet] with access token, optional refresh token, and metadata.

     

       272
       -
         ///

     

       273
       -
         /// IMPORTANT: This method verifies the issuer before returning tokens.

     

       274
       -
         /// If verification fails, the access token is automatically revoked.

     

       275
       -
         Future<TokenSet> exchangeCode(

     

       276
       -
           String code, {

     

       277
       -
           String? codeVerifier,

     

       278
       -
           String? redirectUri,

     

       279
       -
         }) async {

     

       280
       -
           // CRITICAL: DO NOT pre-fetch! Exchange immediately!

     

       281
       -
           // The pre-fetch adds ~678ms delay, during which the browser re-navigates

     

       282
       -
           // and invalidates the authorization code. We need to exchange within ~270ms.

     

       283
       -
           // If we get a nonce error, we'll handle it via the interceptor (though PDS

     

       284
       -
           // doesn't seem to require nonces for initial token exchange).

     

       285
       -
       

     

       286
       -
           final now = DateTime.now();

     

       287
       -
       

     

       288
       -
           final tokenResponse = await _request('token', {

     

       289
       -
             'grant_type': 'authorization_code',

     

       290
       -
             'redirect_uri': redirectUri ?? clientMetadata.redirectUris.first,

     

       291
       -
             'code': code,

     

       292
       -
             if (codeVerifier != null) 'code_verifier': codeVerifier,

     

       293
       -
           });

     

       294
       -
       

     

       295
       -
           try {

     

       296
       -
             // CRITICAL: Verify issuer before trusting the sub

     

       297
       -
             // The tokenResponse MUST always be valid before the "sub" can be trusted

     

       298
       -
             // See: https://atproto.com/specs/oauth

     

       299
       -
             final aud = await _verifyIssuer(tokenResponse['sub'] as String);

     

       300
       -
       

     

       301
       -
             return TokenSet(

     

       302
       -
               aud: aud,

     

       303
       -
               sub: tokenResponse['sub'] as String,

     

       304
       -
               iss: issuer,

     

       305
       -
               scope: tokenResponse['scope'] as String,

     

       306
       -
               refreshToken: tokenResponse['refresh_token'] as String?,

     

       307
       -
               accessToken: tokenResponse['access_token'] as String,

     

       308
       -
               tokenType: tokenResponse['token_type'] as String,

     

       309
       -
               expiresAt:

     

       310
       -
                   tokenResponse['expires_in'] != null

     

       311
       -
                       ? now

     

       312
       -
                           .add(Duration(seconds: tokenResponse['expires_in'] as int))

     

       313
       -
                           .toIso8601String()

     

       314
       -
                       : null,

     

       315
       -
             );

     

       316
       -
           } catch (err) {

     

       317
       -
             // If verification fails, revoke the access token

     

       318
       -
             await revoke(tokenResponse['access_token'] as String);

     

       319
       -
             rethrow;

     

       320
       -
           }

     

       321
       -
         }

     

       322
       -
       

     

       323
       -
         /// Refreshes a token set using the refresh token.

     

       324
       -
         ///

     

       325
       -
         /// [tokenSet] is the current token set with a refresh_token.

     

       326
       -
         ///

     

       327
       -
         /// Returns a new [TokenSet] with fresh tokens.

     

       328
       -
         ///

     

       329
       -
         /// Throws [TokenRefreshError] if refresh fails or no refresh token is available.

     

       330
       -
         ///

     

       331
       -
         /// IMPORTANT: This method verifies the issuer before returning tokens.

     

       332
       -
         Future<TokenSet> refresh(TokenSet tokenSet) async {

     

       333
       -
           if (tokenSet.refreshToken == null) {

     

       334
       -
             throw TokenRefreshError(tokenSet.sub, 'No refresh token available');

     

       335
       -
           }

     

       336
       -
       

     

       337
       -
           // CRITICAL: Verify issuer BEFORE refresh to avoid unnecessary requests

     

       338
       -
           // and ensure the sub is still valid for this issuer

     

       339
       -
           final aud = await _verifyIssuer(tokenSet.sub);

     

       340
       -
       

     

       341
       -
           final now = DateTime.now();

     

       342
       -
       

     

       343
       -
           final tokenResponse = await _request('token', {

     

       344
       -
             'grant_type': 'refresh_token',

     

       345
       -
             'refresh_token': tokenSet.refreshToken,

     

       346
       -
           });

     

       347
       -
       

     

       348
       -
           return TokenSet(

     

       349
       -
             aud: aud,

     

       350
       -
             sub: tokenSet.sub,

     

       351
       -
             iss: issuer,

     

       352
       -
             scope: tokenResponse['scope'] as String,

     

       353
       -
             refreshToken: tokenResponse['refresh_token'] as String?,

     

       354
       -
             accessToken: tokenResponse['access_token'] as String,

     

       355
       -
             tokenType: tokenResponse['token_type'] as String,

     

       356
       -
             expiresAt:

     

       357
       -
                 tokenResponse['expires_in'] != null

     

       358
       -
                     ? now

     

       359
       -
                         .add(Duration(seconds: tokenResponse['expires_in'] as int))

     

       360
       -
                         .toIso8601String()

     

       361
       -
                     : null,

     

       362
       -
           );

     

       363
       -
         }

     

       364
       -
       

     

       365
       -
         /// Verifies that the sub (DID) is indeed issued by this authorization server.

     

       366
       -
         ///

     

       367
       -
         /// This is CRITICAL for security. We must verify that the DID's PDS

     

       368
       -
         /// is protected by this authorization server before trusting tokens.

     

       369
       -
         ///

     

       370
       -
         /// Returns the user's PDS URL (the resource server).

     

       371
       -
         ///

     

       372
       -
         /// Throws if:

     

       373
       -
         /// - DID resolution fails

     

       374
       -
         /// - Issuer mismatch (user may have switched PDS or attack detected)

     

       375
       -
         Future<String> _verifyIssuer(String sub) async {

     

       376
       -
           final cancelToken = CancelToken();

     

       377
       -
           final resolved = await oauthResolver

     

       378
       -
               .resolveFromIdentity(

     

       379
       -
                 sub,

     

       380
       -
                 GetCachedOptions(

     

       381
       -
                   noCache: true,

     

       382
       -
                   allowStale: false,

     

       383
       -
                   cancelToken: cancelToken,

     

       384
       -
                 ),

     

       385
       -
               )

     

       386
       -
               .timeout(

     

       387
       -
                 const Duration(seconds: 10),

     

       388
       -
                 onTimeout: () {

     

       389
       -
                   cancelToken.cancel();

     

       390
       -
                   throw TimeoutException('Issuer verification timed out');

     

       391
       -
                 },

     

       392
       -
               );

     

       393
       -
       

     

       394
       -
           if (issuer != resolved.metadata['issuer']) {

     

       395
       -
             // Best case: user switched PDS

     

       396
       -
             // Worst case: attack attempt

     

       397
       -
             // Either way: MUST NOT allow this token to be used

     

       398
       -
             throw FormatException('Issuer mismatch');

     

       399
       -
           }

     

       400
       -
       

     

       401
       -
           return resolved.pds.toString();

     

       402
       -
         }

     

       403
       -
       

     

       404
       -
         /// Makes a request to an OAuth endpoint (public API).

     

       405
       -
         ///

     

       406
       -
         /// This is a generic method for making OAuth endpoint requests with proper typing.

     

       407
       -
         /// Currently supports: token, revocation, pushed_authorization_request.

     

       408
       -
         ///

     

       409
       -
         /// [endpoint] is the endpoint name.

     

       410
       -
         /// [payload] is the request body parameters.

     

       411
       -
         ///

     

       412
       -
         /// Returns the parsed JSON response.

     

       413
       -
         /// Throws [OAuthResponseError] if the server returns an error.

     

       414
       -
         Future<Map<String, dynamic>> request(

     

       415
       -
           String endpoint,

     

       416
       -
           Map<String, dynamic> payload,

     

       417
       -
         ) async {

     

       418
       -
           return _request(endpoint, payload);

     

       419
       -
         }

     

       420
       -
       

     

       421
       -
         /// Makes a request to an OAuth endpoint (internal implementation).

     

       422
       -
         ///

     

       423
       -
         /// [endpoint] is the endpoint name (e.g., 'token', 'revocation', 'pushed_authorization_request').

     

       424
       -
         /// [payload] is the request body parameters.

     

       425
       -
         ///

     

       426
       -
         /// Returns the parsed JSON response.

     

       427
       -
         /// Throws [OAuthResponseError] if the server returns an error.

     

       428
       -
         Future<Map<String, dynamic>> _request(

     

       429
       -
           String endpoint,

     

       430
       -
           Map<String, dynamic> payload,

     

       431
       -
         ) async {

     

       432
       -
           final url = serverMetadata['${endpoint}_endpoint'];

     

       433
       -
           if (url == null) {

     

       434
       -
             throw StateError('No $endpoint endpoint available');

     

       435
       -
           }

     

       436
       -
       

     

       437
       -
           final auth = await _clientCredentialsFactory();

     

       438
       -
       

     

       439
       -
           final fullPayload = {...payload, ...auth.payload.toJson()};

     

       440
       -
           final encodedData = _wwwFormUrlEncode(fullPayload);

     

       441
       -
       

     

       442
       -
           if (kDebugMode && endpoint == 'token') {

     

       443
       -
             print('🌐 Token exchange HTTP request:');

     

       444
       -
             print('   ⏱️  Request starting at: ${DateTime.now().toIso8601String()}');

     

       445
       -
             print('   URL: $url');

     

       446
       -
             print('   Payload keys: ${fullPayload.keys.toList()}');

     

       447
       -
             print('   grant_type: ${fullPayload['grant_type']}');

     

       448
       -
             print('   client_id: ${fullPayload['client_id']}');

     

       449
       -
             print('   redirect_uri: ${fullPayload['redirect_uri']}');

     

       450
       -
             print('   code: ${fullPayload['code']?.toString().substring(0, 20)}...');

     

       451
       -
             print(

     

       452
       -
               '   code_verifier: ${fullPayload['code_verifier']?.toString().substring(0, 20)}...',

     

       453
       -
             );

     

       454
       -
             print('   Headers: ${auth.headers?.keys.toList() ?? []}');

     

       455
       -
           }

     

       456
       -
       

     

       457
       -
           try {

     

       458
       -
             final response = await _dio.post<Map<String, dynamic>>(

     

       459
       -
               url as String,

     

       460
       -
               data: encodedData,

     

       461
       -
               options: Options(

     

       462
       -
                 headers: {

     

       463
       -
                   if (auth.headers != null) ...auth.headers!,

     

       464
       -
                   'Content-Type': 'application/x-www-form-urlencoded',

     

       465
       -
                 },

     

       466
       -
               ),

     

       467
       -
             );

     

       468
       -
       

     

       469
       -
             final data = response.data;

     

       470
       -
             if (data == null) {

     

       471
       -
               throw OAuthResponseError(response, {'error': 'empty_response'});

     

       472
       -
             }

     

       473
       -
       

     

       474
       -
             if (kDebugMode && endpoint == 'token') {

     

       475
       -
               print('   ✅ Token exchange successful!');

     

       476
       -
             }

     

       477
       -
       

     

       478
       -
             return data;

     

       479
       -
           } on DioException catch (e) {

     

       480
       -
             final response = e.response;

     

       481
       -
             if (response != null) {

     

       482
       -
               if (kDebugMode && endpoint == 'token') {

     

       483
       -
                 print('   ❌ Token exchange failed:');

     

       484
       -
                 print('   Status: ${response.statusCode}');

     

       485
       -
                 print('   Response: ${response.data}');

     

       486
       -
               }

     

       487
       -
               throw OAuthResponseError(response, response.data);

     

       488
       -
             }

     

       489
       -
             rethrow;

     

       490
       -
           }

     

       491
       -
         }

     

       492
       -
       

     

       493
       -
         /// Encodes a map as application/x-www-form-urlencoded.

     

       494
       -
         String _wwwFormUrlEncode(Map<String, dynamic> payload) {

     

       495
       -
           final entries = payload.entries

     

       496
       -
               .where((e) => e.value != null)

     

       497
       -
               .map((e) => MapEntry(e.key, _stringifyValue(e.value)));

     

       498
       -
       

     

       499
       -
           return Uri(queryParameters: Map.fromEntries(entries)).query;

     

       500
       -
         }

     

       501
       -
       

     

       502
       -
         /// Converts a value to string for form encoding.

     

       503
       -
         String _stringifyValue(dynamic value) {

     

       504
       -
           if (value is String) return value;

     

       505
       -
           if (value is num) return value.toString();

     

       506
       -
           if (value is bool) return value.toString();

     

       507
       -
           // For complex types, use JSON encoding

     

       508
       -
           return value.toString();

     

       509
       -
         }

     

       510
       -
       }

     

       511
       -
       

     

       512
       -
       /// Timeout exception.

     

       513
       -
       class TimeoutException implements Exception {

     

       514
       -
         final String message;

     

       515
       -
         TimeoutException(this.message);

     

       516
       -
       

     

       517
       -
         @override

     

       518
       -
         String toString() => 'TimeoutException: $message';

     

       519
       -
       }

-117

packages/atproto_oauth_flutter/lib/src/oauth/oauth_server_factory.dart

···

       1
       -
       import 'package:dio/dio.dart';

     

       2
       -
       

     

       3
       -
       import '../runtime/runtime.dart';

     

       4
       -
       import '../runtime/runtime_implementation.dart';

     

       5
       -
       import '../types.dart';

     

       6
       -
       import 'authorization_server_metadata_resolver.dart';

     

       7
       -
       import 'client_auth.dart';

     

       8
       -
       import 'oauth_resolver.dart';

     

       9
       -
       import 'oauth_server_agent.dart';

     

       10
       -
       

     

       11
       -
       /// Factory for creating OAuth server agents.

     

       12
       -
       ///

     

       13
       -
       /// This factory:

     

       14
       -
       /// 1. Stores common configuration (client metadata, runtime, resolver, etc.)

     

       15
       -
       /// 2. Creates OAuthServerAgent instances for specific issuers

     

       16
       -
       /// 3. Handles both new sessions and restored sessions (with legacy support)

     

       17
       -
       ///

     

       18
       -
       /// The factory pattern allows reusing configuration across multiple agents

     

       19
       -
       /// and simplifies session restoration.

     

       20
       -
       class OAuthServerFactory {

     

       21
       -
         final ClientMetadata clientMetadata;

     

       22
       -
         final Runtime runtime;

     

       23
       -
         final OAuthResolver resolver;

     

       24
       -
         final Dio dio;

     

       25
       -
         final Keyset? keyset;

     

       26
       -
         final DpopNonceCache dpopNonceCache;

     

       27
       -
       

     

       28
       -
         /// Creates a server factory with the given configuration.

     

       29
       -
         ///

     

       30
       -
         /// [clientMetadata] is the validated client metadata.

     

       31
       -
         /// [runtime] provides cryptographic operations.

     

       32
       -
         /// [resolver] handles OAuth metadata discovery.

     

       33
       -
         /// [dio] is the HTTP client.

     

       34
       -
         /// [keyset] is optional (only needed for confidential clients).

     

       35
       -
         /// [dpopNonceCache] stores DPoP nonces per origin.

     

       36
       -
         OAuthServerFactory({

     

       37
       -
           required this.clientMetadata,

     

       38
       -
           required this.runtime,

     

       39
       -
           required this.resolver,

     

       40
       -
           required this.dio,

     

       41
       -
           this.keyset,

     

       42
       -
           required this.dpopNonceCache,

     

       43
       -
         });

     

       44
       -
       

     

       45
       -
         /// Creates an OAuth server agent from an issuer URL.

     

       46
       -
         ///

     

       47
       -
         /// This method:

     

       48
       -
         /// 1. Fetches authorization server metadata for the issuer

     

       49
       -
         /// 2. Uses the provided authMethod or negotiates one (for legacy sessions)

     

       50
       -
         /// 3. Creates an OAuthServerAgent with the metadata

     

       51
       -
         ///

     

       52
       -
         /// [issuer] is the authorization server URL.

     

       53
       -
         /// [authMethod] is the authentication method to use.

     

       54
       -
         ///   - For new sessions, pass the result of negotiateClientAuthMethod

     

       55
       -
         ///   - For legacy sessions (before authMethod was stored), pass 'legacy'

     

       56
       -
         ///     and the method will be negotiated automatically

     

       57
       -
         /// [dpopKey] is the DPoP signing key.

     

       58
       -
         /// [options] are optional cache/cancellation options.

     

       59
       -
         ///

     

       60
       -
         /// The 'legacy' authMethod is for backwards compatibility with sessions

     

       61
       -
         /// created before we started storing the authMethod. Support for this

     

       62
       -
         /// may be removed in the future.

     

       63
       -
         ///

     

       64
       -
         /// Throws [AuthMethodUnsatisfiableError] if auth method cannot be satisfied.

     

       65
       -
         Future<OAuthServerAgent> fromIssuer(

     

       66
       -
           String issuer,

     

       67
       -
           dynamic authMethod, // ClientAuthMethod or 'legacy'

     

       68
       -
           Key dpopKey, [

     

       69
       -
           GetCachedOptions? options,

     

       70
       -
         ]) async {

     

       71
       -
           final serverMetadata = await resolver.getAuthorizationServerMetadata(

     

       72
       -
             issuer,

     

       73
       -
             options,

     

       74
       -
           );

     

       75
       -
       

     

       76
       -
           ClientAuthMethod finalAuthMethod;

     

       77
       -
           if (authMethod == 'legacy') {

     

       78
       -
             // Backwards compatibility: compute auth method from metadata

     

       79
       -
             finalAuthMethod = negotiateClientAuthMethod(

     

       80
       -
               serverMetadata,

     

       81
       -
               clientMetadata,

     

       82
       -
               keyset,

     

       83
       -
             );

     

       84
       -
           } else {

     

       85
       -
             finalAuthMethod = authMethod as ClientAuthMethod;

     

       86
       -
           }

     

       87
       -
       

     

       88
       -
           return fromMetadata(serverMetadata, finalAuthMethod, dpopKey);

     

       89
       -
         }

     

       90
       -
       

     

       91
       -
         /// Creates an OAuth server agent from authorization server metadata.

     

       92
       -
         ///

     

       93
       -
         /// This is useful when you already have the metadata cached.

     

       94
       -
         ///

     

       95
       -
         /// [serverMetadata] is the authorization server metadata.

     

       96
       -
         /// [authMethod] is the authentication method to use.

     

       97
       -
         /// [dpopKey] is the DPoP signing key.

     

       98
       -
         ///

     

       99
       -
         /// Throws [AuthMethodUnsatisfiableError] if auth method cannot be satisfied.

     

       100
       -
         OAuthServerAgent fromMetadata(

     

       101
       -
           Map<String, dynamic> serverMetadata,

     

       102
       -
           ClientAuthMethod authMethod,

     

       103
       -
           Key dpopKey,

     

       104
       -
         ) {

     

       105
       -
           return OAuthServerAgent(

     

       106
       -
             authMethod: authMethod,

     

       107
       -
             dpopKey: dpopKey,

     

       108
       -
             serverMetadata: serverMetadata,

     

       109
       -
             clientMetadata: clientMetadata,

     

       110
       -
             dpopNonces: dpopNonceCache,

     

       111
       -
             oauthResolver: resolver,

     

       112
       -
             runtime: runtime,

     

       113
       -
             keyset: keyset,

     

       114
       -
             dio: dio,

     

       115
       -
           );

     

       116
       -
         }

     

       117
       -
       }

-196

packages/atproto_oauth_flutter/lib/src/oauth/protected_resource_metadata_resolver.dart

···

       1
       -
       import 'package:dio/dio.dart';

     

       2
       -
       

     

       3
       -
       import '../dpop/fetch_dpop.dart';

     

       4
       -
       import '../util.dart';

     

       5
       -
       import 'authorization_server_metadata_resolver.dart';

     

       6
       -
       

     

       7
       -
       /// Cache interface for protected resource metadata.

     

       8
       -
       ///

     

       9
       -
       /// Implementations should store metadata keyed by origin (scheme://host:port).

     

       10
       -
       typedef ProtectedResourceMetadataCache =

     

       11
       -
           SimpleStore<String, Map<String, dynamic>>;

     

       12
       -
       

     

       13
       -
       /// Configuration for the protected resource metadata resolver.

     

       14
       -
       class OAuthProtectedResourceMetadataResolverConfig {

     

       15
       -
         /// Whether to allow HTTP (non-HTTPS) resource URLs.

     

       16
       -
         ///

     

       17
       -
         /// Should only be true in development/test environments.

     

       18
       -
         /// Production MUST use HTTPS.

     

       19
       -
         final bool allowHttpResource;

     

       20
       -
       

     

       21
       -
         const OAuthProtectedResourceMetadataResolverConfig({

     

       22
       -
           this.allowHttpResource = false,

     

       23
       -
         });

     

       24
       -
       }

     

       25
       -
       

     

       26
       -
       /// Resolves OAuth Protected Resource Metadata via RFC 9728 discovery.

     

       27
       -
       ///

     

       28
       -
       /// This class:

     

       29
       -
       /// 1. Validates resource URLs (must be HTTPS in production)

     

       30
       -
       /// 2. Fetches metadata from `{origin}/.well-known/oauth-protected-resource`

     

       31
       -
       /// 3. Validates the metadata against the spec

     

       32
       -
       /// 4. Verifies resource field matches origin

     

       33
       -
       /// 5. Caches metadata to avoid repeated fetches

     

       34
       -
       ///

     

       35
       -
       /// See: https://www.rfc-editor.org/rfc/rfc9728.html

     

       36
       -
       class OAuthProtectedResourceMetadataResolver {

     

       37
       -
         final ProtectedResourceMetadataCache _cache;

     

       38
       -
         final Dio _dio;

     

       39
       -
         final bool _allowHttpResource;

     

       40
       -
       

     

       41
       -
         /// Creates a resolver with the given cache and HTTP client.

     

       42
       -
         ///

     

       43
       -
         /// [cache] is used to store fetched metadata. Use an in-memory store for

     

       44
       -
         /// testing or a persistent store for production.

     

       45
       -
         ///

     

       46
       -
         /// [dio] is the HTTP client. If not provided, creates a default instance.

     

       47
       -
         ///

     

       48
       -
         /// [config] allows customizing behavior (e.g., allowing HTTP in tests).

     

       49
       -
         OAuthProtectedResourceMetadataResolver(

     

       50
       -
           this._cache, {

     

       51
       -
           Dio? dio,

     

       52
       -
           OAuthProtectedResourceMetadataResolverConfig? config,

     

       53
       -
         }) : _dio = dio ?? Dio(),

     

       54
       -
              _allowHttpResource = config?.allowHttpResource ?? false;

     

       55
       -
       

     

       56
       -
         /// Resolves protected resource metadata for the given resource URL.

     

       57
       -
         ///

     

       58
       -
         /// The [resource] can be a String URL or Uri. Only the origin is used.

     

       59
       -
         ///

     

       60
       -
         /// Returns the complete metadata as a Map. Throws if:

     

       61
       -
         /// - Resource is not a valid URL

     

       62
       -
         /// - Protocol is not HTTP/HTTPS

     

       63
       -
         /// - HTTP is used in production (allowHttpResource = false)

     

       64
       -
         /// - Network request fails

     

       65
       -
         /// - Response is not valid JSON

     

       66
       -
         /// - Metadata validation fails

     

       67
       -
         /// - Resource mismatch detected

     

       68
       -
         ///

     

       69
       -
         /// Example:

     

       70
       -
         /// ```dart

     

       71
       -
         /// final resolver = OAuthProtectedResourceMetadataResolver(cache);

     

       72
       -
         /// final metadata = await resolver.get('https://pds.example.com');

     

       73
       -
         /// print(metadata['authorization_servers']);

     

       74
       -
         /// ```

     

       75
       -
         Future<Map<String, dynamic>> get(

     

       76
       -
           dynamic resource, [

     

       77
       -
           GetCachedOptions? options,

     

       78
       -
         ]) async {

     

       79
       -
           // Parse URL and extract origin

     

       80
       -
           final uri = resource is Uri ? resource : Uri.parse(resource.toString());

     

       81
       -
           final protocol = uri.scheme;

     

       82
       -
           final origin =

     

       83
       -
               '${uri.scheme}://${uri.host}${uri.hasPort ? ':${uri.port}' : ''}';

     

       84
       -
       

     

       85
       -
           // Validate protocol

     

       86
       -
           if (protocol != 'https' && protocol != 'http') {

     

       87
       -
             throw FormatException(

     

       88
       -
               'Invalid protected resource metadata URL protocol: $protocol',

     

       89
       -
             );

     

       90
       -
           }

     

       91
       -
       

     

       92
       -
           // Security check: disallow HTTP in production

     

       93
       -
           if (protocol == 'http' && !_allowHttpResource) {

     

       94
       -
             throw FormatException(

     

       95
       -
               'Unsecure resource metadata URL ($protocol) only allowed in development and test environments',

     

       96
       -
             );

     

       97
       -
           }

     

       98
       -
       

     

       99
       -
           // Check cache first (unless noCache is set)

     

       100
       -
           if (options?.noCache != true) {

     

       101
       -
             final cached = await _cache.get(origin);

     

       102
       -
             if (cached != null) {

     

       103
       -
               return cached;

     

       104
       -
             }

     

       105
       -
           }

     

       106
       -
       

     

       107
       -
           // Fetch fresh metadata

     

       108
       -
           final metadata = await _fetchMetadata(origin, options);

     

       109
       -
       

     

       110
       -
           // Store in cache

     

       111
       -
           await _cache.set(origin, metadata);

     

       112
       -
       

     

       113
       -
           return metadata;

     

       114
       -
         }

     

       115
       -
       

     

       116
       -
         /// Fetches metadata from the well-known endpoint.

     

       117
       -
         Future<Map<String, dynamic>> _fetchMetadata(

     

       118
       -
           String origin,

     

       119
       -
           GetCachedOptions? options,

     

       120
       -
         ) async {

     

       121
       -
           final url =

     

       122
       -
               Uri.parse(

     

       123
       -
                 origin,

     

       124
       -
               ).replace(path: '/.well-known/oauth-protected-resource').toString();

     

       125
       -
       

     

       126
       -
           try {

     

       127
       -
             final response = await _dio.get<Map<String, dynamic>>(

     

       128
       -
               url,

     

       129
       -
               options: Options(

     

       130
       -
                 headers: {'accept': 'application/json'},

     

       131
       -
                 followRedirects: false, // response must be 200 OK, no redirects

     

       132
       -
                 validateStatus: (status) => status == 200,

     

       133
       -
               ),

     

       134
       -
               cancelToken: options?.cancelToken,

     

       135
       -
             );

     

       136
       -
       

     

       137
       -
             // Verify content type

     

       138
       -
             final contentType = contentMime(

     

       139
       -
               response.headers.map.map((key, value) => MapEntry(key, value.first)),

     

       140
       -
             );

     

       141
       -
       

     

       142
       -
             if (contentType != 'application/json') {

     

       143
       -
               throw DioException(

     

       144
       -
                 requestOptions: response.requestOptions,

     

       145
       -
                 response: response,

     

       146
       -
                 type: DioExceptionType.badResponse,

     

       147
       -
                 message: 'Unexpected content type for "$url"',

     

       148
       -
               );

     

       149
       -
             }

     

       150
       -
       

     

       151
       -
             final metadata = response.data;

     

       152
       -
             if (metadata == null) {

     

       153
       -
               throw DioException(

     

       154
       -
                 requestOptions: response.requestOptions,

     

       155
       -
                 response: response,

     

       156
       -
                 type: DioExceptionType.badResponse,

     

       157
       -
                 message: 'Empty response body for "$url"',

     

       158
       -
               );

     

       159
       -
             }

     

       160
       -
       

     

       161
       -
             // Validate metadata

     

       162
       -
             _validateMetadata(metadata, origin);

     

       163
       -
       

     

       164
       -
             return metadata;

     

       165
       -
           } on DioException catch (e) {

     

       166
       -
             if (e.response?.statusCode == 200) {

     

       167
       -
               // Already handled above, rethrow

     

       168
       -
               rethrow;

     

       169
       -
             }

     

       170
       -
             throw DioException(

     

       171
       -
               requestOptions: e.requestOptions,

     

       172
       -
               response: e.response,

     

       173
       -
               type: e.type,

     

       174
       -
               message:

     

       175
       -
                   'Unexpected status code ${e.response?.statusCode ?? 'unknown'} for "$url"',

     

       176
       -
               error: e.error,

     

       177
       -
             );

     

       178
       -
           }

     

       179
       -
         }

     

       180
       -
       

     

       181
       -
         /// Validates protected resource metadata.

     

       182
       -
         ///

     

       183
       -
         /// Checks:

     

       184
       -
         /// - Resource field matches the expected origin

     

       185
       -
         /// - Authorization servers list is present

     

       186
       -
         void _validateMetadata(Map<String, dynamic> metadata, String expectedOrigin) {

     

       187
       -
           // Validate resource field

     

       188
       -
           // https://www.rfc-editor.org/rfc/rfc9728.html#section-3.3

     

       189
       -
           final resource = metadata['resource'];

     

       190
       -
           if (resource != expectedOrigin) {

     

       191
       -
             throw FormatException(

     

       192
       -
               'Invalid resource: expected "$expectedOrigin", got "$resource"',

     

       193
       -
             );

     

       194
       -
           }

     

       195
       -
         }

     

       196
       -
       }

-213

packages/atproto_oauth_flutter/lib/src/oauth/validate_client_metadata.dart

···

       1
       -
       import '../constants.dart';

     

       2
       -
       import '../types.dart';

     

       3
       -
       import 'client_auth.dart';

     

       4
       -
       

     

       5
       -
       /// Validates client metadata for OAuth compliance.

     

       6
       -
       ///

     

       7
       -
       /// This function performs comprehensive validation of client metadata to ensure:

     

       8
       -
       /// 1. Client ID is valid (either discoverable HTTPS or loopback)

     

       9
       -
       /// 2. Required ATPROTO scope is present

     

       10
       -
       /// 3. Required response_types and grant_types are present

     

       11
       -
       /// 4. Authentication method is properly configured

     

       12
       -
       /// 5. For private_key_jwt, keyset and JWKS are properly configured

     

       13
       -
       ///

     

       14
       -
       /// The validation enforces ATPROTO OAuth requirements on top of standard OAuth.

     

       15
       -
       ///

     

       16
       -
       /// Returns the validated ClientMetadata.

     

       17
       -
       /// Throws TypeError if validation fails.

     

       18
       -
       ClientMetadata validateClientMetadata(

     

       19
       -
         Map<String, dynamic> input,

     

       20
       -
         Keyset? keyset,

     

       21
       -
       ) {

     

       22
       -
         // Allow passing a keyset and omitting jwks/jwks_uri

     

       23
       -
         // The keyset will be serialized into the metadata

     

       24
       -
         Map<String, dynamic> enrichedInput = input;

     

       25
       -
         if (input['jwks'] == null &&

     

       26
       -
             input['jwks_uri'] == null &&

     

       27
       -
             keyset != null &&

     

       28
       -
             keyset.size > 0) {

     

       29
       -
           enrichedInput = {...input, 'jwks': keyset.toJSON()};

     

       30
       -
         }

     

       31
       -
       

     

       32
       -
         // Parse into ClientMetadata

     

       33
       -
         final metadata = ClientMetadata.fromJson(enrichedInput);

     

       34
       -
       

     

       35
       -
         // Validate client ID

     

       36
       -
         final clientId = metadata.clientId;

     

       37
       -
         if (clientId == null) {

     

       38
       -
           throw FormatException('Client metadata must include client_id');

     

       39
       -
         }

     

       40
       -
       

     

       41
       -
         if (clientId.startsWith('http:')) {

     

       42
       -
           // Loopback client ID (for development)

     

       43
       -
           _assertOAuthLoopbackClientId(clientId);

     

       44
       -
         } else {

     

       45
       -
           // Discoverable client ID (production)

     

       46
       -
           _assertOAuthDiscoverableClientId(clientId);

     

       47
       -
         }

     

       48
       -
       

     

       49
       -
         // Validate scope includes "atproto"

     

       50
       -
         final scopes = metadata.scope?.split(' ') ?? [];

     

       51
       -
         if (!scopes.contains('atproto')) {

     

       52
       -
           throw FormatException('Client metadata must include the "atproto" scope');

     

       53
       -
         }

     

       54
       -
       

     

       55
       -
         // Validate response_types

     

       56
       -
         if (!metadata.responseTypes.contains('code')) {

     

       57
       -
           throw FormatException('"response_types" must include "code"');

     

       58
       -
         }

     

       59
       -
       

     

       60
       -
         // Validate grant_types

     

       61
       -
         if (!metadata.grantTypes.contains('authorization_code')) {

     

       62
       -
           throw FormatException('"grant_types" must include "authorization_code"');

     

       63
       -
         }

     

       64
       -
       

     

       65
       -
         // Validate authentication method

     

       66
       -
         final method = metadata.tokenEndpointAuthMethod;

     

       67
       -
         final methodAlg = metadata.tokenEndpointAuthSigningAlg;

     

       68
       -
       

     

       69
       -
         switch (method) {

     

       70
       -
           case 'none':

     

       71
       -
             if (methodAlg != null) {

     

       72
       -
               throw FormatException(

     

       73
       -
                 '"token_endpoint_auth_signing_alg" must not be provided when '

     

       74
       -
                 '"token_endpoint_auth_method" is "$method"',

     

       75
       -
               );

     

       76
       -
             }

     

       77
       -
             break;

     

       78
       -
       

     

       79
       -
           case 'private_key_jwt':

     

       80
       -
             if (methodAlg == null) {

     

       81
       -
               throw FormatException(

     

       82
       -
                 '"token_endpoint_auth_signing_alg" must be provided when '

     

       83
       -
                 '"token_endpoint_auth_method" is "$method"',

     

       84
       -
               );

     

       85
       -
             }

     

       86
       -
       

     

       87
       -
             if (keyset == null) {

     

       88
       -
               throw FormatException(

     

       89
       -
                 'Client authentication method "$method" requires a keyset',

     

       90
       -
               );

     

       91
       -
             }

     

       92
       -
       

     

       93
       -
             // Validate signing keys

     

       94
       -
             final signingKeys = keyset.keys.where((key) => key.kid != null).toList();

     

       95
       -
       

     

       96
       -
             if (signingKeys.isEmpty) {

     

       97
       -
               throw FormatException(

     

       98
       -
                 'Client authentication method "$method" requires at least one '

     

       99
       -
                 'active signing key with a "kid" property',

     

       100
       -
               );

     

       101
       -
             }

     

       102
       -
       

     

       103
       -
             if (!signingKeys.any((key) => key.algorithms.contains(fallbackAlg))) {

     

       104
       -
               throw FormatException(

     

       105
       -
                 'Client authentication method "$method" requires at least one '

     

       106
       -
                 'active "$fallbackAlg" signing key',

     

       107
       -
               );

     

       108
       -
             }

     

       109
       -
       

     

       110
       -
             // Validate JWKS

     

       111
       -
             if (metadata.jwks != null) {

     

       112
       -
               // Ensure all signing keys are in the JWKS

     

       113
       -
               final jwksKeys = (metadata.jwks!['keys'] as List?) ?? [];

     

       114
       -
               for (final key in signingKeys) {

     

       115
       -
                 final found = jwksKeys.any((k) {

     

       116
       -
                   if (k is! Map<String, dynamic>) return false;

     

       117
       -
                   final revoked = k['revoked'] as bool?;

     

       118
       -
                   return k['kid'] == key.kid && revoked != true;

     

       119
       -
                 });

     

       120
       -
       

     

       121
       -
                 if (!found) {

     

       122
       -
                   throw FormatException(

     

       123
       -
                     'Missing or inactive key "${key.kid}" in jwks. '

     

       124
       -
                     'Make sure that every signing key of the Keyset is declared as '

     

       125
       -
                     'an active key in the Metadata\'s JWKS.',

     

       126
       -
                   );

     

       127
       -
                 }

     

       128
       -
               }

     

       129
       -
             } else if (metadata.jwksUri != null) {

     

       130
       -
               // JWKS URI is acceptable, but we can't validate it here

     

       131
       -
               // (we don't want to download the file during validation)

     

       132
       -
             } else {

     

       133
       -
               throw FormatException(

     

       134
       -
                 'Client authentication method "$method" requires a JWKS',

     

       135
       -
               );

     

       136
       -
             }

     

       137
       -
             break;

     

       138
       -
       

     

       139
       -
           default:

     

       140
       -
             throw FormatException(

     

       141
       -
               'Unsupported "token_endpoint_auth_method" value: $method',

     

       142
       -
             );

     

       143
       -
         }

     

       144
       -
       

     

       145
       -
         return metadata;

     

       146
       -
       }

     

       147
       -
       

     

       148
       -
       /// Validates that a client ID is a valid discoverable client ID.

     

       149
       -
       ///

     

       150
       -
       /// A discoverable client ID must be an HTTPS URL that can be dereferenced

     

       151
       -
       /// to get the client metadata document.

     

       152
       -
       ///

     

       153
       -
       /// See: https://datatracker.ietf.org/doc/draft-ietf-oauth-client-id-metadata-document/

     

       154
       -
       void _assertOAuthDiscoverableClientId(String clientId) {

     

       155
       -
         final uri = Uri.tryParse(clientId);

     

       156
       -
       

     

       157
       -
         if (uri == null) {

     

       158
       -
           throw FormatException('Invalid client_id URL: $clientId');

     

       159
       -
         }

     

       160
       -
       

     

       161
       -
         if (uri.scheme != 'https') {

     

       162
       -
           throw FormatException('Discoverable client_id must use HTTPS: $clientId');

     

       163
       -
         }

     

       164
       -
       

     

       165
       -
         if (uri.hasFragment) {

     

       166
       -
           throw FormatException(

     

       167
       -
             'Discoverable client_id must not contain a fragment: $clientId',

     

       168
       -
           );

     

       169
       -
         }

     

       170
       -
       

     

       171
       -
         // Validate it's a valid URL

     

       172
       -
         if (!uri.hasAuthority) {

     

       173
       -
           throw FormatException('Invalid discoverable client_id URL: $clientId');

     

       174
       -
         }

     

       175
       -
       }

     

       176
       -
       

     

       177
       -
       /// Validates that a client ID is a valid loopback client ID.

     

       178
       -
       ///

     

       179
       -
       /// A loopback client ID is used for development/testing and must be:

     

       180
       -
       /// - An HTTP URL (not HTTPS)

     

       181
       -
       /// - Using localhost or 127.0.0.1

     

       182
       -
       /// - Optionally with a port

     

       183
       -
       ///

     

       184
       -
       /// See: https://datatracker.ietf.org/doc/html/rfc8252#section-7.3

     

       185
       -
       void _assertOAuthLoopbackClientId(String clientId) {

     

       186
       -
         final uri = Uri.tryParse(clientId);

     

       187
       -
       

     

       188
       -
         if (uri == null) {

     

       189
       -
           throw FormatException('Invalid client_id URL: $clientId');

     

       190
       -
         }

     

       191
       -
       

     

       192
       -
         if (uri.scheme != 'http') {

     

       193
       -
           throw FormatException(

     

       194
       -
             'Loopback client_id must use HTTP (not HTTPS): $clientId',

     

       195
       -
           );

     

       196
       -
         }

     

       197
       -
       

     

       198
       -
         final host = uri.host.toLowerCase();

     

       199
       -
         if (host != 'localhost' &&

     

       200
       -
             host != '127.0.0.1' &&

     

       201
       -
             host != '[::1]' &&

     

       202
       -
             host != '::1') {

     

       203
       -
           throw FormatException(

     

       204
       -
             'Loopback client_id must use localhost or 127.0.0.1: $clientId',

     

       205
       -
           );

     

       206
       -
         }

     

       207
       -
       

     

       208
       -
         if (uri.hasFragment) {

     

       209
       -
           throw FormatException(

     

       210
       -
             'Loopback client_id must not contain a fragment: $clientId',

     

       211
       -
           );

     

       212
       -
         }

     

       213
       -
       }

-330

packages/atproto_oauth_flutter/lib/src/platform/README.md

···

       1
       -
       # Flutter Platform Layer

     

       2
       -
       

     

       3
       -
       This directory contains Flutter-specific implementations of the atproto OAuth client.

     

       4
       -
       

     

       5
       -
       ## Overview

     

       6
       -
       

     

       7
       -
       The platform layer provides concrete implementations of all the abstract interfaces needed for OAuth to work on Flutter:

     

       8
       -
       

     

       9
       -
       1. **Storage** (`flutter_stores.dart`) - Secure session storage and caching

     

       10
       -
       2. **Cryptography** (`flutter_runtime.dart`) - Key generation, hashing, random values

     

       11
       -
       3. **Key Management** (`flutter_key.dart`) - EC key implementation with pointycastle

     

       12
       -
       4. **High-level API** (`flutter_oauth_client.dart`) - Easy-to-use Flutter OAuth client

     

       13
       -
       

     

       14
       -
       ## Architecture

     

       15
       -
       

     

       16
       -
       ```

     

       17
       -
       ┌─────────────────────────────────────────────────────────────┐

     

       18
       -
       │                   FlutterOAuthClient                         │

     

       19
       -
       │                    (High-level API)                          │

     

       20
       -
       └─────────────────────────────────────────────────────────────┘

     

       21
       -
                                   │

     

       22
       -
                                   ▼

     

       23
       -
       ┌─────────────────────────────────────────────────────────────┐

     

       24
       -
       │                      OAuthClient                             │

     

       25
       -
       │                   (Core OAuth logic)                         │

     

       26
       -
       └─────────────────────────────────────────────────────────────┘

     

       27
       -
                                   │

     

       28
       -
               ┌───────────────────┼───────────────────┐

     

       29
       -
               ▼                   ▼                   ▼

     

       30
       -
       ┌─────────────┐    ┌─────────────┐    ┌─────────────┐

     

       31
       -
       │   Storage   │    │   Runtime   │    │    Key      │

     

       32
       -
       │   (secure   │    │   (crypto)  │    │ (signing)   │

     

       33
       -
       │   storage)  │    │             │    │             │

     

       34
       -
       └─────────────┘    └─────────────┘    └─────────────┘

     

       35
       -
               │                  │                   │

     

       36
       -
               ▼                  ▼                   ▼

     

       37
       -
       ┌─────────────┐    ┌─────────────┐    ┌─────────────┐

     

       38
       -
       │   flutter_  │    │   crypto/   │    │ pointycastle│

     

       39
       -
       │   secure_   │    │ Random.     │    │   (ECDSA)   │

     

       40
       -
       │   storage   │    │   secure()  │    │             │

     

       41
       -
       └─────────────┘    └─────────────┘    └─────────────┘

     

       42
       -
       ```

     

       43
       -
       

     

       44
       -
       ## Files

     

       45
       -
       

     

       46
       -
       ### `flutter_stores.dart`

     

       47
       -
       

     

       48
       -
       Implements storage and caching:

     

       49
       -
       

     

       50
       -
       - **FlutterSessionStore**: Persists OAuth sessions in secure storage

     

       51
       -
         - iOS: Keychain

     

       52
       -
         - Android: EncryptedSharedPreferences

     

       53
       -
         - Stores tokens, DPoP keys, and auth methods

     

       54
       -
       

     

       55
       -
       - **FlutterStateStore**: Ephemeral OAuth state (in-memory)

     

       56
       -
         - PKCE verifiers

     

       57
       -
         - State parameters

     

       58
       -
         - Application state

     

       59
       -
       

     

       60
       -
       - **Cache Implementations**: In-memory caches with TTL

     

       61
       -
         - `InMemoryAuthorizationServerMetadataCache`: OAuth server metadata (1 min TTL)

     

       62
       -
         - `InMemoryProtectedResourceMetadataCache`: Resource server metadata (1 min TTL)

     

       63
       -
         - `InMemoryDpopNonceCache`: DPoP nonces (10 min TTL)

     

       64
       -
         - `FlutterDidCache`: DID documents (1 min TTL)

     

       65
       -
         - `FlutterHandleCache`: Handle → DID mappings (1 min TTL)

     

       66
       -
       

     

       67
       -
       ### `flutter_runtime.dart`

     

       68
       -
       

     

       69
       -
       Implements cryptographic operations:

     

       70
       -
       

     

       71
       -
       - **FlutterRuntime**: Platform-specific crypto implementation

     

       72
       -
         - `createKey`: EC key generation (ES256/ES384/ES512/ES256K)

     

       73
       -
         - `digest`: SHA-256/384/512 hashing

     

       74
       -
         - `getRandomValues`: Cryptographically secure random bytes

     

       75
       -
         - `requestLock`: Local (in-memory) locking for token refresh

     

       76
       -
       

     

       77
       -
       Uses:

     

       78
       -
       - `crypto` package for SHA hashing

     

       79
       -
       - `Random.secure()` for randomness

     

       80
       -
       - `utils/lock.dart` for concurrency control

     

       81
       -
       

     

       82
       -
       ### `flutter_key.dart`

     

       83
       -
       

     

       84
       -
       Implements EC key management:

     

       85
       -
       

     

       86
       -
       - **FlutterKey**: Elliptic Curve key for JWT signing

     

       87
       -
         - Supports ES256, ES384, ES512, ES256K

     

       88
       -
         - Uses `pointycastle` for ECDSA operations

     

       89
       -
         - Implements `Key` interface from runtime layer

     

       90
       -
         - Serializable (for session storage)

     

       91
       -
       

     

       92
       -
       Features:

     

       93
       -
       - Secure key generation with `FortunaRandom`

     

       94
       -
       - JWT signing (compact format)

     

       95
       -
       - JWK representation (public and private)

     

       96
       -
       - Key reconstruction from JSON

     

       97
       -
       

     

       98
       -
       ### `flutter_oauth_client.dart`

     

       99
       -
       

     

       100
       -
       High-level Flutter API:

     

       101
       -
       

     

       102
       -
       - **FlutterOAuthClient**: Easy-to-use OAuth client

     

       103
       -
         - Pre-configured storage and caching

     

       104
       -
         - Automatic FlutterWebAuth2 integration

     

       105
       -
         - Simplified sign-in flow

     

       106
       -
         - Session management helpers

     

       107
       -
       

     

       108
       -
       Key method:

     

       109
       -
       ```dart

     

       110
       -
       // One-liner sign in!

     

       111
       -
       final session = await client.signIn('alice.bsky.social');

     

       112
       -
       ```

     

       113
       -
       

     

       114
       -
       This handles:

     

       115
       -
       1. Authorization URL generation

     

       116
       -
       2. Browser launch (FlutterWebAuth2)

     

       117
       -
       3. Callback handling

     

       118
       -
       4. Token exchange

     

       119
       -
       5. Session storage

     

       120
       -
       

     

       121
       -
       ## Security Features

     

       122
       -
       

     

       123
       -
       ### 1. Secure Storage

     

       124
       -
       

     

       125
       -
       Tokens are **never** stored in plain text:

     

       126
       -
       

     

       127
       -
       - **iOS**: Stored in Keychain with device encryption

     

       128
       -
       - **Android**: EncryptedSharedPreferences with AES-256

     

       129
       -
       

     

       130
       -
       ### 2. DPoP (Demonstrating Proof of Possession)

     

       131
       -
       

     

       132
       -
       Tokens are cryptographically bound to EC keys:

     

       133
       -
       

     

       134
       -
       - Prevents token theft (stolen tokens are useless without the key)

     

       135
       -
       - Keys stored alongside tokens in secure storage

     

       136
       -
       - Every API request includes a signed DPoP proof

     

       137
       -
       

     

       138
       -
       ### 3. PKCE (Proof Key for Code Exchange)

     

       139
       -
       

     

       140
       -
       Protects authorization codes from interception:

     

       141
       -
       

     

       142
       -
       - Random code verifier generated for each flow

     

       143
       -
       - Challenge sent to server (SHA-256 hash of verifier)

     

       144
       -
       - Verifier required to exchange code for tokens

     

       145
       -
       

     

       146
       -
       ### 4. Concurrency Control

     

       147
       -
       

     

       148
       -
       Prevents race conditions in token refresh:

     

       149
       -
       

     

       150
       -
       - Local lock ensures only one refresh at a time

     

       151
       -
       - Reduces chances of using refresh token twice

     

       152
       -
       - Handles concurrent requests gracefully

     

       153
       -
       

     

       154
       -
       ### 5. Automatic Cleanup

     

       155
       -
       

     

       156
       -
       Sessions are automatically deleted on errors:

     

       157
       -
       

     

       158
       -
       - Token refresh failures

     

       159
       -
       - Invalid token errors

     

       160
       -
       - Auth method unsatisfiable errors

     

       161
       -
       - Revocation (local and remote)

     

       162
       -
       

     

       163
       -
       ## Usage

     

       164
       -
       

     

       165
       -
       ### Basic Usage

     

       166
       -
       

     

       167
       -
       ```dart

     

       168
       -
       import 'package:atproto_oauth_flutter/atproto_oauth_flutter.dart';

     

       169
       -
       

     

       170
       -
       // Initialize

     

       171
       -
       final client = FlutterOAuthClient(

     

       172
       -
         clientMetadata: ClientMetadata(

     

       173
       -
           clientId: 'https://example.com/client-metadata.json',

     

       174
       -
           redirectUris: ['myapp://oauth/callback'],

     

       175
       -
         ),

     

       176
       -
       );

     

       177
       -
       

     

       178
       -
       // Sign in

     

       179
       -
       final session = await client.signIn('alice.bsky.social');

     

       180
       -
       

     

       181
       -
       // Use session

     

       182
       -
       print('Signed in as: ${session.sub}');

     

       183
       -
       

     

       184
       -
       // Restore later

     

       185
       -
       final restored = await client.restore(session.sub);

     

       186
       -
       

     

       187
       -
       // Sign out

     

       188
       -
       await client.revoke(session.sub);

     

       189
       -
       ```

     

       190
       -
       

     

       191
       -
       ### Custom Configuration

     

       192
       -
       

     

       193
       -
       ```dart

     

       194
       -
       final client = FlutterOAuthClient(

     

       195
       -
         clientMetadata: ClientMetadata(

     

       196
       -
           clientId: 'https://example.com/client-metadata.json',

     

       197
       -
           redirectUris: ['myapp://oauth/callback'],

     

       198
       -
         ),

     

       199
       -
       

     

       200
       -
         // Custom secure storage

     

       201
       -
         secureStorage: FlutterSecureStorage(

     

       202
       -
           aOptions: AndroidOptions(

     

       203
       -
             encryptedSharedPreferences: true,

     

       204
       -
           ),

     

       205
       -
         ),

     

       206
       -
       

     

       207
       -
         // Development mode

     

       208
       -
         allowHttp: true,

     

       209
       -
       

     

       210
       -
         // Custom PLC directory

     

       211
       -
         plcDirectoryUrl: 'https://plc.example.com',

     

       212
       -
       );

     

       213
       -
       ```

     

       214
       -
       

     

       215
       -
       ## Testing

     

       216
       -
       

     

       217
       -
       The platform layer is designed to be testable:

     

       218
       -
       

     

       219
       -
       1. **Mock Storage**: Provide test implementation of `SessionStore`

     

       220
       -
       2. **Mock Runtime**: Provide test implementation of `RuntimeImplementation`

     

       221
       -
       3. **Mock Keys**: Use fixed test keys instead of random generation

     

       222
       -
       

     

       223
       -
       Example:

     

       224
       -
       

     

       225
       -
       ```dart

     

       226
       -
       // Test storage that uses in-memory map

     

       227
       -
       class TestSessionStore implements SessionStore {

     

       228
       -
         final Map<String, Session> _store = {};

     

       229
       -
       

     

       230
       -
         @override

     

       231
       -
         Future<Session?> get(String key, {CancellationToken? signal}) async {

     

       232
       -
           return _store[key];

     

       233
       -
         }

     

       234
       -
       

     

       235
       -
         @override

     

       236
       -
         Future<void> set(String key, Session value) async {

     

       237
       -
           _store[key] = value;

     

       238
       -
         }

     

       239
       -
       

     

       240
       -
         // ... etc

     

       241
       -
       }

     

       242
       -
       

     

       243
       -
       // Use in tests

     

       244
       -
       final client = OAuthClient(

     

       245
       -
         OAuthClientOptions(

     

       246
       -
           // ... other options

     

       247
       -
           sessionStore: TestSessionStore(),

     

       248
       -
         ),

     

       249
       -
       );

     

       250
       -
       ```

     

       251
       -
       

     

       252
       -
       ## Platform Setup

     

       253
       -
       

     

       254
       -
       ### iOS

     

       255
       -
       

     

       256
       -
       Add URL scheme to `Info.plist`:

     

       257
       -
       

     

       258
       -
       ```xml

     

       259
       -
       <key>CFBundleURLTypes</key>

     

       260
       -
       <array>

     

       261
       -
         <dict>

     

       262
       -
           <key>CFBundleURLSchemes</key>

     

       263
       -
           <array>

     

       264
       -
             <string>myapp</string>

     

       265
       -
           </array>

     

       266
       -
         </dict>

     

       267
       -
       </array>

     

       268
       -
       ```

     

       269
       -
       

     

       270
       -
       ### Android

     

       271
       -
       

     

       272
       -
       Add intent filter to `AndroidManifest.xml`:

     

       273
       -
       

     

       274
       -
       ```xml

     

       275
       -
       <intent-filter>

     

       276
       -
         <action android:name="android.intent.action.VIEW" />

     

       277
       -
         <category android:name="android.intent.category.DEFAULT" />

     

       278
       -
         <category android:name="android.intent.category.BROWSABLE" />

     

       279
       -
         <data android:scheme="myapp" />

     

       280
       -
       </intent-filter>

     

       281
       -
       ```

     

       282
       -
       

     

       283
       -
       ## Dependencies

     

       284
       -
       

     

       285
       -
       - `flutter_secure_storage: ^9.2.2` - Secure token storage

     

       286
       -
       - `flutter_web_auth_2: ^4.1.0` - Browser-based OAuth flow

     

       287
       -
       - `pointycastle: ^3.9.1` - Elliptic Curve cryptography

     

       288
       -
       - `crypto: ^3.0.3` - SHA hashing

     

       289
       -
       

     

       290
       -
       ## Known Limitations

     

       291
       -
       

     

       292
       -
       ### 1. Key Serialization

     

       293
       -
       

     

       294
       -
       Currently, DPoP keys are regenerated on each app restart. This works but has drawbacks:

     

       295
       -
       

     

       296
       -
       - Tokens bound to old keys become invalid (require refresh)

     

       297
       -
       - Slight performance impact on session restoration

     

       298
       -
       

     

       299
       -
       **Fix**: Implement proper `Key` serialization in `flutter_key.dart`:

     

       300
       -
       - Add `toJson()` method that includes private key components

     

       301
       -
       - Add `fromJson()` factory that reconstructs the key

     

       302
       -
       - Store serialized keys in session storage

     

       303
       -
       

     

       304
       -
       ### 2. Local Lock Only

     

       305
       -
       

     

       306
       -
       The lock implementation is in-memory and doesn't work across:

     

       307
       -
       - Multiple isolates

     

       308
       -
       - Multiple processes

     

       309
       -
       - Multiple app instances

     

       310
       -
       

     

       311
       -
       For most Flutter apps, this is fine. For advanced use cases, implement a platform-specific lock.

     

       312
       -
       

     

       313
       -
       ### 3. Cache TTLs

     

       314
       -
       

     

       315
       -
       Cache TTLs are fixed (1 minute for most caches). Consider making these configurable if your app has different caching requirements.

     

       316
       -
       

     

       317
       -
       ## Future Improvements

     

       318
       -
       

     

       319
       -
       1. **Key Persistence**: Implement proper key serialization (see above)

     

       320
       -
       2. **Platform Locks**: Add iOS/Android native lock implementations

     

       321
       -
       3. **Configurable TTLs**: Allow cache TTL customization

     

       322
       -
       4. **Background Refresh**: Support token refresh in background

     

       323
       -
       5. **Biometric Auth**: Optional biometric unlock for sessions

     

       324
       -
       6. **Migration Helpers**: Tools for migrating from other OAuth libraries

     

       325
       -
       

     

       326
       -
       ## See Also

     

       327
       -
       

     

       328
       -
       - [Example usage](../../example/flutter_oauth_example.dart)

     

       329
       -
       - [Main library docs](../../atproto_oauth_flutter.dart)

     

       330
       -
       - [Core OAuth client](../client/oauth_client.dart)

-435

packages/atproto_oauth_flutter/lib/src/platform/flutter_key.dart

···

       1
       -
       import 'dart:convert';

     

       2
       -
       import 'dart:math';

     

       3
       -
       import 'dart:typed_data';

     

       4
       -
       

     

       5
       -
       import 'package:pointycastle/export.dart' as pointycastle;

     

       6
       -
       

     

       7
       -
       import '../runtime/runtime_implementation.dart';

     

       8
       -
       

     

       9
       -
       /// Flutter implementation of Key using pointycastle for cryptographic operations.

     

       10
       -
       ///

     

       11
       -
       /// Supports EC keys with the following algorithms:

     

       12
       -
       /// - ES256 (P-256/secp256r1)

     

       13
       -
       /// - ES384 (P-384/secp384r1)

     

       14
       -
       /// - ES512 (P-521/secp521r1) - Note: P-521, not P-512

     

       15
       -
       /// - ES256K (secp256k1)

     

       16
       -
       ///

     

       17
       -
       /// This class handles:

     

       18
       -
       /// - Key generation with secure randomness

     

       19
       -
       /// - JWT signing (ES256/ES384/ES512/ES256K)

     

       20
       -
       /// - JWK representation (public and private components)

     

       21
       -
       /// - Serialization/deserialization for session storage

     

       22
       -
       class FlutterKey implements Key {

     

       23
       -
         /// The EC private key (contains both private and public components)

     

       24
       -
         final pointycastle.ECPrivateKey privateKey;

     

       25
       -
       

     

       26
       -
         /// The EC public key

     

       27
       -
         final pointycastle.ECPublicKey publicKey;

     

       28
       -
       

     

       29
       -
         /// The algorithm this key supports

     

       30
       -
         final String algorithm;

     

       31
       -
       

     

       32
       -
         /// Optional key ID

     

       33
       -
         final String? _kid;

     

       34
       -
       

     

       35
       -
         /// Creates a FlutterKey from EC key components.

     

       36
       -
         FlutterKey({

     

       37
       -
           required this.privateKey,

     

       38
       -
           required this.publicKey,

     

       39
       -
           required this.algorithm,

     

       40
       -
           String? kid,

     

       41
       -
         }) : _kid = kid;

     

       42
       -
       

     

       43
       -
         @override

     

       44
       -
         List<String> get algorithms => [algorithm];

     

       45
       -
       

     

       46
       -
         @override

     

       47
       -
         String? get kid => _kid;

     

       48
       -
       

     

       49
       -
         @override

     

       50
       -
         String get usage => 'sign';

     

       51
       -
       

     

       52
       -
         @override

     

       53
       -
         Map<String, dynamic>? get bareJwk {

     

       54
       -
           // Return public key components only (no private key 'd')

     

       55
       -
           final jwk = _ecPublicKeyToJwk(publicKey, algorithm);

     

       56
       -
           if (_kid != null) {

     

       57
       -
             jwk['kid'] = _kid;

     

       58
       -
           }

     

       59
       -
           return jwk;

     

       60
       -
         }

     

       61
       -
       

     

       62
       -
         /// Full JWK including private key components.

     

       63
       -
         ///

     

       64
       -
         /// WARNING: This contains sensitive key material. Never log or expose.

     

       65
       -
         /// Only use for secure storage.

     

       66
       -
         Map<String, dynamic> get privateJwk {

     

       67
       -
           final jwk = _ecPrivateKeyToJwk(privateKey, publicKey, algorithm);

     

       68
       -
           if (_kid != null) {

     

       69
       -
             jwk['kid'] = _kid;

     

       70
       -
           }

     

       71
       -
           return jwk;

     

       72
       -
         }

     

       73
       -
       

     

       74
       -
         @override

     

       75
       -
         Future<String> createJwt(

     

       76
       -
           Map<String, dynamic> header,

     

       77
       -
           Map<String, dynamic> payload,

     

       78
       -
         ) async {

     

       79
       -
           // Build JWT header

     

       80
       -
           final jwtHeader = <String, dynamic>{

     

       81
       -
             'typ': 'JWT',

     

       82
       -
             'alg': algorithm,

     

       83
       -
             ...header,

     

       84
       -
           };

     

       85
       -
           if (_kid != null) {

     

       86
       -
             jwtHeader['kid'] = _kid;

     

       87
       -
           }

     

       88
       -
       

     

       89
       -
           // Encode header and payload

     

       90
       -
           final headerB64 = _base64UrlEncode(utf8.encode(json.encode(jwtHeader)));

     

       91
       -
           final payloadB64 = _base64UrlEncode(utf8.encode(json.encode(payload)));

     

       92
       -
       

     

       93
       -
           // Create signing input

     

       94
       -
           final signingInput = '$headerB64.$payloadB64';

     

       95
       -
           final signingBytes = utf8.encode(signingInput);

     

       96
       -
       

     

       97
       -
           // Sign with appropriate algorithm

     

       98
       -
           final signature = _signEcdsa(signingBytes, privateKey, algorithm);

     

       99
       -
       

     

       100
       -
           // Encode signature

     

       101
       -
           final signatureB64 = _base64UrlEncode(signature);

     

       102
       -
       

     

       103
       -
           // Return compact JWT

     

       104
       -
           return '$signingInput.$signatureB64';

     

       105
       -
         }

     

       106
       -
       

     

       107
       -
         /// Generates a new FlutterKey for the given algorithms.

     

       108
       -
         ///

     

       109
       -
         /// Returns a key supporting the first compatible algorithm from the list.

     

       110
       -
         ///

     

       111
       -
         /// Throws [UnsupportedError] if no compatible algorithm is found.

     

       112
       -
         static Future<FlutterKey> generate(List<String> algs) async {

     

       113
       -
           // Try algorithms in order

     

       114
       -
           for (final alg in algs) {

     

       115
       -
             switch (alg) {

     

       116
       -
               case 'ES256':

     

       117
       -
                 return _generateECKey('ES256', 'P-256');

     

       118
       -
               case 'ES384':

     

       119
       -
                 return _generateECKey('ES384', 'P-384');

     

       120
       -
               case 'ES512':

     

       121
       -
                 return _generateECKey('ES512', 'P-521'); // Note: P-521, not P-512

     

       122
       -
               case 'ES256K':

     

       123
       -
                 return _generateECKey('ES256K', 'secp256k1');

     

       124
       -
             }

     

       125
       -
           }

     

       126
       -
       

     

       127
       -
           throw UnsupportedError(

     

       128
       -
             'No supported algorithm found in: ${algs.join(", ")}',

     

       129
       -
           );

     

       130
       -
         }

     

       131
       -
       

     

       132
       -
         /// Reconstructs a FlutterKey from serialized JWK data.

     

       133
       -
         ///

     

       134
       -
         /// This is used when restoring sessions from storage.

     

       135
       -
         factory FlutterKey.fromJwk(Map<String, dynamic> jwk) {

     

       136
       -
           final kty = jwk['kty'] as String?;

     

       137
       -
           if (kty != 'EC') {

     

       138
       -
             throw FormatException('Unsupported key type: $kty');

     

       139
       -
           }

     

       140
       -
       

     

       141
       -
           final crv = jwk['crv'] as String?;

     

       142
       -
           final alg = jwk['alg'] as String?;

     

       143
       -
           final kid = jwk['kid'] as String?;

     

       144
       -
       

     

       145
       -
           if (crv == null || alg == null) {

     

       146
       -
             throw FormatException('Missing required JWK fields');

     

       147
       -
           }

     

       148
       -
       

     

       149
       -
           // Parse key components

     

       150
       -
           final x = _base64UrlDecode(jwk['x'] as String);

     

       151
       -
           final y = _base64UrlDecode(jwk['y'] as String);

     

       152
       -
           final d = jwk['d'] != null ? _base64UrlDecode(jwk['d'] as String) : null;

     

       153
       -
       

     

       154
       -
           if (d == null) {

     

       155
       -
             throw FormatException('Private key component (d) is required');

     

       156
       -
           }

     

       157
       -
       

     

       158
       -
           // Get curve

     

       159
       -
           final curve = _getCurveForName(crv);

     

       160
       -
       

     

       161
       -
           // Reconstruct public key

     

       162
       -
           final publicKey = pointycastle.ECPublicKey(

     

       163
       -
             curve.curve.createPoint(_bytesToBigInt(x), _bytesToBigInt(y)),

     

       164
       -
             curve,

     

       165
       -
           );

     

       166
       -
       

     

       167
       -
           // Reconstruct private key

     

       168
       -
           final privateKey = pointycastle.ECPrivateKey(_bytesToBigInt(d), curve);

     

       169
       -
       

     

       170
       -
           return FlutterKey(

     

       171
       -
             privateKey: privateKey,

     

       172
       -
             publicKey: publicKey,

     

       173
       -
             algorithm: alg,

     

       174
       -
             kid: kid,

     

       175
       -
           );

     

       176
       -
         }

     

       177
       -
       

     

       178
       -
         /// Serializes this key to JSON (for session storage).

     

       179
       -
         ///

     

       180
       -
         /// WARNING: Contains private key material. Store securely.

     

       181
       -
         Map<String, dynamic> toJson() => privateJwk;

     

       182
       -
       

     

       183
       -
         // ============================================================================

     

       184
       -
         // Private helper methods

     

       185
       -
         // ============================================================================

     

       186
       -
       

     

       187
       -
         /// Generates an EC key pair for the given algorithm and curve.

     

       188
       -
         static Future<FlutterKey> _generateECKey(

     

       189
       -
           String algorithm,

     

       190
       -
           String curveName,

     

       191
       -
         ) async {

     

       192
       -
           final curve = _getCurveForName(curveName);

     

       193
       -
       

     

       194
       -
           // Create secure random generator

     

       195
       -
           final secureRandom = pointycastle.FortunaRandom();

     

       196
       -
           final random = Random.secure();

     

       197
       -
           final seeds = List<int>.generate(32, (_) => random.nextInt(256));

     

       198
       -
           secureRandom.seed(pointycastle.KeyParameter(Uint8List.fromList(seeds)));

     

       199
       -
       

     

       200
       -
           // Generate key pair

     

       201
       -
           final keyGen = pointycastle.ECKeyGenerator();

     

       202
       -
           keyGen.init(

     

       203
       -
             pointycastle.ParametersWithRandom(

     

       204
       -
               pointycastle.ECKeyGeneratorParameters(curve),

     

       205
       -
               secureRandom,

     

       206
       -
             ),

     

       207
       -
           );

     

       208
       -
       

     

       209
       -
           final keyPair = keyGen.generateKeyPair();

     

       210
       -
           final privateKey = keyPair.privateKey as pointycastle.ECPrivateKey;

     

       211
       -
           final publicKey = keyPair.publicKey as pointycastle.ECPublicKey;

     

       212
       -
       

     

       213
       -
           return FlutterKey(

     

       214
       -
             privateKey: privateKey,

     

       215
       -
             publicKey: publicKey,

     

       216
       -
             algorithm: algorithm,

     

       217
       -
           );

     

       218
       -
         }

     

       219
       -
       

     

       220
       -
         /// Gets the EC domain parameters for a given curve name.

     

       221
       -
         static pointycastle.ECDomainParameters _getCurveForName(String name) {

     

       222
       -
           // Use pointycastle's standard curve implementations

     

       223
       -
           switch (name) {

     

       224
       -
             case 'P-256':

     

       225
       -
             case 'prime256v1':

     

       226
       -
             case 'secp256r1':

     

       227
       -
               return pointycastle.ECCurve_secp256r1();

     

       228
       -
             case 'P-384':

     

       229
       -
             case 'secp384r1':

     

       230
       -
               return pointycastle.ECCurve_secp384r1();

     

       231
       -
             case 'P-521':

     

       232
       -
             case 'secp521r1':

     

       233
       -
               return pointycastle.ECCurve_secp521r1();

     

       234
       -
             case 'secp256k1':

     

       235
       -
               return pointycastle.ECCurve_secp256k1();

     

       236
       -
             default:

     

       237
       -
               throw UnsupportedError('Unsupported curve: $name');

     

       238
       -
           }

     

       239
       -
         }

     

       240
       -
       

     

       241
       -
         /// Gets the curve name for JWK representation.

     

       242
       -
         static String _getCurveName(String algorithm) {

     

       243
       -
           switch (algorithm) {

     

       244
       -
             case 'ES256':

     

       245
       -
               return 'P-256';

     

       246
       -
             case 'ES384':

     

       247
       -
               return 'P-384';

     

       248
       -
             case 'ES512':

     

       249
       -
               return 'P-521';

     

       250
       -
             case 'ES256K':

     

       251
       -
               return 'secp256k1';

     

       252
       -
             default:

     

       253
       -
               throw UnsupportedError('Unsupported algorithm: $algorithm');

     

       254
       -
           }

     

       255
       -
         }

     

       256
       -
       

     

       257
       -
         /// Gets the hash algorithm for signing.

     

       258
       -
         static String _getHashAlgorithm(String algorithm) {

     

       259
       -
           switch (algorithm) {

     

       260
       -
             case 'ES256':

     

       261
       -
             case 'ES256K':

     

       262
       -
               return 'SHA-256';

     

       263
       -
             case 'ES384':

     

       264
       -
               return 'SHA-384';

     

       265
       -
             case 'ES512':

     

       266
       -
               return 'SHA-512';

     

       267
       -
             default:

     

       268
       -
               throw UnsupportedError('Unsupported algorithm: $algorithm');

     

       269
       -
           }

     

       270
       -
         }

     

       271
       -
       

     

       272
       -
         /// Signs data using ECDSA with deterministic signatures (RFC 6979).

     

       273
       -
         ///

     

       274
       -
         /// This uses deterministic ECDSA which doesn't require a source of randomness,

     

       275
       -
         /// making it more secure and avoiding SecureRandom initialization issues.

     

       276
       -
         static Uint8List _signEcdsa(

     

       277
       -
           List<int> data,

     

       278
       -
           pointycastle.ECPrivateKey privateKey,

     

       279
       -
           String algorithm,

     

       280
       -
         ) {

     

       281
       -
           // Get the appropriate hash algorithm for this signing algorithm

     

       282
       -
           final hashAlg = _getHashAlgorithm(algorithm);

     

       283
       -
       

     

       284
       -
           // Build deterministic ECDSA signer name (e.g., "SHA-256/DET-ECDSA")

     

       285
       -
           final signerName = '$hashAlg/DET-ECDSA';

     

       286
       -
       

     

       287
       -
           // Use deterministic ECDSA signer (RFC 6979) - no randomness required!

     

       288
       -
           final signer = pointycastle.Signer(signerName);

     

       289
       -
           signer.init(

     

       290
       -
             true, // signing mode

     

       291
       -
             pointycastle.PrivateKeyParameter<pointycastle.ECPrivateKey>(privateKey),

     

       292
       -
           );

     

       293
       -
       

     

       294
       -
           // Sign the data (signer will hash it internally)

     

       295
       -
           final signature =

     

       296
       -
               signer.generateSignature(Uint8List.fromList(data))

     

       297
       -
                   as pointycastle.ECSignature;

     

       298
       -
       

     

       299
       -
           // Encode as IEEE P1363 format (r || s)

     

       300
       -
           final r = _bigIntToBytes(signature.r, _getSignatureLength(algorithm));

     

       301
       -
           final s = _bigIntToBytes(signature.s, _getSignatureLength(algorithm));

     

       302
       -
       

     

       303
       -
           return Uint8List.fromList([...r, ...s]);

     

       304
       -
         }

     

       305
       -
       

     

       306
       -
         /// Creates a pointycastle Digest for the given hash algorithm.

     

       307
       -
         static pointycastle.Digest _createDigest(String algorithm) {

     

       308
       -
           switch (algorithm) {

     

       309
       -
             case 'SHA-256':

     

       310
       -
               return pointycastle.SHA256Digest();

     

       311
       -
             case 'SHA-384':

     

       312
       -
               return pointycastle.SHA384Digest();

     

       313
       -
             case 'SHA-512':

     

       314
       -
               return pointycastle.SHA512Digest();

     

       315
       -
             default:

     

       316
       -
               throw UnsupportedError('Unsupported hash: $algorithm');

     

       317
       -
           }

     

       318
       -
         }

     

       319
       -
       

     

       320
       -
         /// Gets the signature length in bytes for the algorithm.

     

       321
       -
         static int _getSignatureLength(String algorithm) {

     

       322
       -
           switch (algorithm) {

     

       323
       -
             case 'ES256':

     

       324
       -
             case 'ES256K':

     

       325
       -
               return 32;

     

       326
       -
             case 'ES384':

     

       327
       -
               return 48;

     

       328
       -
             case 'ES512':

     

       329
       -
               return 66; // P-521 uses 66 bytes per component

     

       330
       -
             default:

     

       331
       -
               throw UnsupportedError('Unsupported algorithm: $algorithm');

     

       332
       -
           }

     

       333
       -
         }

     

       334
       -
       

     

       335
       -
         /// Converts an EC public key to JWK format.

     

       336
       -
         static Map<String, dynamic> _ecPublicKeyToJwk(

     

       337
       -
           pointycastle.ECPublicKey publicKey,

     

       338
       -
           String algorithm,

     

       339
       -
         ) {

     

       340
       -
           final q = publicKey.Q!;

     

       341
       -
           final curve = _getCurveName(algorithm);

     

       342
       -
       

     

       343
       -
           return {

     

       344
       -
             'kty': 'EC',

     

       345
       -
             'crv': curve,

     

       346
       -
             'x': _base64UrlEncode(_bigIntToBytes(q.x!.toBigInteger()!)),

     

       347
       -
             'y': _base64UrlEncode(_bigIntToBytes(q.y!.toBigInteger()!)),

     

       348
       -
             'alg': algorithm,

     

       349
       -
             'use': 'sig',

     

       350
       -
             'key_ops': ['sign'],

     

       351
       -
           };

     

       352
       -
         }

     

       353
       -
       

     

       354
       -
         /// Converts an EC private key to JWK format (includes private component).

     

       355
       -
         static Map<String, dynamic> _ecPrivateKeyToJwk(

     

       356
       -
           pointycastle.ECPrivateKey privateKey,

     

       357
       -
           pointycastle.ECPublicKey publicKey,

     

       358
       -
           String algorithm,

     

       359
       -
         ) {

     

       360
       -
           final jwk = _ecPublicKeyToJwk(publicKey, algorithm);

     

       361
       -
           jwk['d'] = _base64UrlEncode(_bigIntToBytes(privateKey.d!));

     

       362
       -
           return jwk;

     

       363
       -
         }

     

       364
       -
       

     

       365
       -
         /// Converts a BigInt to bytes with optional padding.

     

       366
       -
         static Uint8List _bigIntToBytes(BigInt number, [int? length]) {

     

       367
       -
           var bytes = _encodeBigInt(number);

     

       368
       -
       

     

       369
       -
           if (length != null) {

     

       370
       -
             if (bytes.length > length) {

     

       371
       -
               // Remove leading zeros

     

       372
       -
               bytes = bytes.sublist(bytes.length - length);

     

       373
       -
             } else if (bytes.length < length) {

     

       374
       -
               // Add leading zeros

     

       375
       -
               final padded = Uint8List(length);

     

       376
       -
               padded.setRange(length - bytes.length, length, bytes);

     

       377
       -
               bytes = padded;

     

       378
       -
             }

     

       379
       -
           }

     

       380
       -
       

     

       381
       -
           return bytes;

     

       382
       -
         }

     

       383
       -
       

     

       384
       -
         /// Encodes a BigInt as bytes (unsigned, big-endian).

     

       385
       -
         static Uint8List _encodeBigInt(BigInt number) {

     

       386
       -
           // Handle zero

     

       387
       -
           if (number == BigInt.zero) {

     

       388
       -
             return Uint8List.fromList([0]);

     

       389
       -
           }

     

       390
       -
       

     

       391
       -
           // Handle negative (should not happen for EC keys)

     

       392
       -
           if (number.isNegative) {

     

       393
       -
             throw ArgumentError('Cannot encode negative BigInt');

     

       394
       -
           }

     

       395
       -
       

     

       396
       -
           // Convert to bytes

     

       397
       -
           final bytes = <int>[];

     

       398
       -
           var n = number;

     

       399
       -
           while (n > BigInt.zero) {

     

       400
       -
             bytes.insert(0, (n & BigInt.from(0xff)).toInt());

     

       401
       -
             n = n >> 8;

     

       402
       -
           }

     

       403
       -
       

     

       404
       -
           return Uint8List.fromList(bytes);

     

       405
       -
         }

     

       406
       -
       

     

       407
       -
         /// Converts bytes to BigInt (unsigned, big-endian).

     

       408
       -
         static BigInt _bytesToBigInt(List<int> bytes) {

     

       409
       -
           var result = BigInt.zero;

     

       410
       -
           for (var byte in bytes) {

     

       411
       -
             result = (result << 8) | BigInt.from(byte);

     

       412
       -
           }

     

       413
       -
           return result;

     

       414
       -
         }

     

       415
       -
       

     

       416
       -
         /// Base64url encodes bytes (no padding).

     

       417
       -
         static String _base64UrlEncode(List<int> bytes) {

     

       418
       -
           return base64Url.encode(bytes).replaceAll('=', '');

     

       419
       -
         }

     

       420
       -
       

     

       421
       -
         /// Base64url decodes a string.

     

       422
       -
         static Uint8List _base64UrlDecode(String str) {

     

       423
       -
           // Add padding if needed

     

       424
       -
           var s = str;

     

       425
       -
           switch (s.length % 4) {

     

       426
       -
             case 2:

     

       427
       -
               s += '==';

     

       428
       -
               break;

     

       429
       -
             case 3:

     

       430
       -
               s += '=';

     

       431
       -
               break;

     

       432
       -
           }

     

       433
       -
           return base64Url.decode(s);

     

       434
       -
         }

     

       435
       -
       }

-302

packages/atproto_oauth_flutter/lib/src/platform/flutter_oauth_client.dart

···

       1
       -
       import 'package:dio/dio.dart';

     

       2
       -
       import 'package:flutter/foundation.dart';

     

       3
       -
       import 'package:flutter_secure_storage/flutter_secure_storage.dart';

     

       4
       -
       import 'package:flutter_web_auth_2/flutter_web_auth_2.dart';

     

       5
       -
       

     

       6
       -
       import '../client/oauth_client.dart';

     

       7
       -
       import '../session/oauth_session.dart';

     

       8
       -
       import 'flutter_runtime.dart';

     

       9
       -
       import 'flutter_stores.dart';

     

       10
       -
       

     

       11
       -
       /// Flutter-specific OAuth client with sensible defaults.

     

       12
       -
       ///

     

       13
       -
       /// This is a high-level wrapper around [OAuthClient] that provides:

     

       14
       -
       /// - Automatic storage configuration (flutter_secure_storage)

     

       15
       -
       /// - Platform-specific crypto (pointycastle + crypto package)

     

       16
       -
       /// - In-memory caching with TTL

     

       17
       -
       /// - Convenient sign-in flow (authorize + FlutterWebAuth2 + callback)

     

       18
       -
       /// - Session management (restore, revoke)

     

       19
       -
       ///

     

       20
       -
       /// Example usage:

     

       21
       -
       /// ```dart

     

       22
       -
       /// // Initialize client

     

       23
       -
       /// final client = FlutterOAuthClient(

     

       24
       -
       ///   clientMetadata: ClientMetadata(

     

       25
       -
       ///     clientId: 'https://example.com/client-metadata.json',

     

       26
       -
       ///     redirectUris: ['myapp://oauth/callback'],

     

       27
       -
       ///     scope: 'atproto transition:generic',

     

       28
       -
       ///   ),

     

       29
       -
       /// );

     

       30
       -
       ///

     

       31
       -
       /// // Sign in with handle

     

       32
       -
       /// try {

     

       33
       -
       ///   final session = await client.signIn('alice.bsky.social');

     

       34
       -
       ///   print('Signed in as: ${session.sub}');

     

       35
       -
       ///

     

       36
       -
       ///   // Use the session for authenticated requests

     

       37
       -
       ///   final agent = session.pdsClient;

     

       38
       -
       ///   // ... make API calls

     

       39
       -
       /// } catch (e) {

     

       40
       -
       ///   print('Sign in failed: $e');

     

       41
       -
       /// }

     

       42
       -
       ///

     

       43
       -
       /// // Later: restore session

     

       44
       -
       /// try {

     

       45
       -
       ///   final session = await client.restore('did:plc:abc123');

     

       46
       -
       ///   print('Session restored');

     

       47
       -
       /// } catch (e) {

     

       48
       -
       ///   print('Session restoration failed: $e');

     

       49
       -
       /// }

     

       50
       -
       ///

     

       51
       -
       /// // Sign out

     

       52
       -
       /// await client.revoke('did:plc:abc123');

     

       53
       -
       /// ```

     

       54
       -
       class FlutterOAuthClient extends OAuthClient {

     

       55
       -
         /// Creates a FlutterOAuthClient with Flutter-specific defaults.

     

       56
       -
         ///

     

       57
       -
         /// Parameters:

     

       58
       -
         /// - [clientMetadata]: Client configuration (required)

     

       59
       -
         /// - [responseMode]: OAuth response mode (default: query)

     

       60
       -
         /// - [allowHttp]: Allow HTTP for testing (default: false)

     

       61
       -
         /// - [secureStorage]: Custom secure storage instance (optional)

     

       62
       -
         /// - [dio]: Custom HTTP client (optional)

     

       63
       -
         /// - [plcDirectoryUrl]: Custom PLC directory URL (optional)

     

       64
       -
         /// - [handleResolverUrl]: Custom handle resolver URL (optional)

     

       65
       -
         ///

     

       66
       -
         /// Throws [FormatException] if client metadata is invalid.

     

       67
       -
         FlutterOAuthClient({

     

       68
       -
           required ClientMetadata clientMetadata,

     

       69
       -
           OAuthResponseMode responseMode = OAuthResponseMode.query,

     

       70
       -
           bool allowHttp = false,

     

       71
       -
           FlutterSecureStorage? secureStorage,

     

       72
       -
           Dio? dio,

     

       73
       -
           String? plcDirectoryUrl,

     

       74
       -
           String? handleResolverUrl,

     

       75
       -
         }) : super(

     

       76
       -
                OAuthClientOptions(

     

       77
       -
                  // Config

     

       78
       -
                  responseMode: responseMode,

     

       79
       -
                  clientMetadata: clientMetadata.toJson(),

     

       80
       -
                  keyset: null, // Mobile apps are public clients

     

       81
       -
                  allowHttp: allowHttp,

     

       82
       -
       

     

       83
       -
                  // Storage (Flutter-specific)

     

       84
       -
                  stateStore: FlutterStateStore(),

     

       85
       -
                  sessionStore: FlutterSessionStore(secureStorage),

     

       86
       -
       

     

       87
       -
                  // Caches (in-memory with TTL)

     

       88
       -
                  authorizationServerMetadataCache:

     

       89
       -
                      InMemoryAuthorizationServerMetadataCache(),

     

       90
       -
                  protectedResourceMetadataCache:

     

       91
       -
                      InMemoryProtectedResourceMetadataCache(),

     

       92
       -
                  dpopNonceCache: InMemoryDpopNonceCache(),

     

       93
       -
                  didCache: FlutterDidCache(),

     

       94
       -
                  handleCache: FlutterHandleCache(),

     

       95
       -
       

     

       96
       -
                  // Platform implementation

     

       97
       -
                  runtimeImplementation: const FlutterRuntime(),

     

       98
       -
       

     

       99
       -
                  // HTTP client

     

       100
       -
                  dio: dio,

     

       101
       -
       

     

       102
       -
                  // Optional overrides

     

       103
       -
                  plcDirectoryUrl: plcDirectoryUrl,

     

       104
       -
                  handleResolverUrl: handleResolverUrl,

     

       105
       -
                ),

     

       106
       -
              );

     

       107
       -
       

     

       108
       -
         /// Sign in with an atProto handle, DID, or URL.

     

       109
       -
         ///

     

       110
       -
         /// This is a convenience method that:

     

       111
       -
         /// 1. Initiates authorization flow ([authorize])

     

       112
       -
         /// 2. Opens browser with FlutterWebAuth2

     

       113
       -
         /// 3. Handles OAuth callback

     

       114
       -
         /// 4. Returns authenticated session

     

       115
       -
         ///

     

       116
       -
         /// The [input] can be:

     

       117
       -
         /// - An atProto handle: "alice.bsky.social"

     

       118
       -
         /// - A DID: "did:plc:..."

     

       119
       -
         /// - A PDS URL: "https://pds.example.com"

     

       120
       -
         /// - An authorization server URL: "https://auth.example.com"

     

       121
       -
         ///

     

       122
       -
         /// The [options] can specify:

     

       123
       -
         /// - redirectUri: Override default redirect URI

     

       124
       -
         /// - state: Application state to preserve

     

       125
       -
         /// - scope: Override default scope

     

       126
       -
         /// - Other OIDC parameters (prompt, display, etc.)

     

       127
       -
         ///

     

       128
       -
         /// Returns an [OAuthSession] with authenticated access.

     

       129
       -
         ///

     

       130
       -
         /// Throws:

     

       131
       -
         /// - [FormatException] if parameters are invalid

     

       132
       -
         /// - [OAuthResolverError] if identity resolution fails

     

       133
       -
         /// - [OAuthCallbackError] if authentication fails

     

       134
       -
         /// - [Exception] if user cancels (flutter_web_auth_2 throws PlatformException)

     

       135
       -
         ///

     

       136
       -
         /// Example:

     

       137
       -
         /// ```dart

     

       138
       -
         /// // Simple sign in

     

       139
       -
         /// final session = await client.signIn('alice.bsky.social');

     

       140
       -
         ///

     

       141
       -
         /// // With custom state

     

       142
       -
         /// final session = await client.signIn(

     

       143
       -
         ///   'alice.bsky.social',

     

       144
       -
         ///   options: AuthorizeOptions(state: 'my-app-state'),

     

       145
       -
         /// );

     

       146
       -
         /// ```

     

       147
       -
         Future<OAuthSession> signIn(

     

       148
       -
           String input, {

     

       149
       -
           AuthorizeOptions? options,

     

       150
       -
           CancelToken? cancelToken,

     

       151
       -
         }) async {

     

       152
       -
           // CRITICAL: Use HTTPS redirect URI for OAuth (prevents browser retry)

     

       153
       -
           // but listen for CUSTOM SCHEME in FlutterWebAuth2 (only custom schemes can be intercepted)

     

       154
       -
           // The HTTPS page will redirect to custom scheme, triggering the callback

     

       155
       -
           final redirectUri =

     

       156
       -
               options?.redirectUri ?? clientMetadata.redirectUris.first;

     

       157
       -
       

     

       158
       -
           if (!clientMetadata.redirectUris.contains(redirectUri)) {

     

       159
       -
             throw FormatException('Invalid redirect_uri: $redirectUri');

     

       160
       -
           }

     

       161
       -
       

     

       162
       -
           // Find the custom scheme redirect URI from the list

     

       163
       -
           // FlutterWebAuth2 can ONLY intercept custom schemes, not HTTPS

     

       164
       -
           final customSchemeUri = clientMetadata.redirectUris.firstWhere(

     

       165
       -
             (uri) => !uri.startsWith('http://') && !uri.startsWith('https://'),

     

       166
       -
             orElse:

     

       167
       -
                 () => redirectUri, // Fallback to primary if no custom scheme found

     

       168
       -
           );

     

       169
       -
       

     

       170
       -
           final callbackUrlScheme = _extractScheme(customSchemeUri);

     

       171
       -
       

     

       172
       -
           // Step 1: Start OAuth authorization flow

     

       173
       -
           final authUrl = await authorize(

     

       174
       -
             input,

     

       175
       -
             options:

     

       176
       -
                 options != null

     

       177
       -
                     ? AuthorizeOptions(

     

       178
       -
                       redirectUri: redirectUri,

     

       179
       -
                       state: options.state,

     

       180
       -
                       scope: options.scope,

     

       181
       -
                       nonce: options.nonce,

     

       182
       -
                       dpopJkt: options.dpopJkt,

     

       183
       -
                       maxAge: options.maxAge,

     

       184
       -
                       claims: options.claims,

     

       185
       -
                       uiLocales: options.uiLocales,

     

       186
       -
                       idTokenHint: options.idTokenHint,

     

       187
       -
                       display: options.display ?? 'touch', // Mobile-friendly default

     

       188
       -
                       prompt: options.prompt,

     

       189
       -
                       authorizationDetails: options.authorizationDetails,

     

       190
       -
                     )

     

       191
       -
                     : AuthorizeOptions(

     

       192
       -
                       redirectUri: redirectUri,

     

       193
       -
                       display: 'touch', // Mobile-friendly default

     

       194
       -
                     ),

     

       195
       -
             cancelToken: cancelToken,

     

       196
       -
           );

     

       197
       -
       

     

       198
       -
           // Step 2: Open browser for user authentication

     

       199
       -
           if (kDebugMode) {

     

       200
       -
             print('🔐 Opening browser for OAuth...');

     

       201
       -
             print('   Auth URL: $authUrl');

     

       202
       -
             print('   OAuth redirect URI (PDS will redirect here): $redirectUri');

     

       203
       -
             print(

     

       204
       -
               '   FlutterWebAuth2 callback scheme (listening for): $callbackUrlScheme',

     

       205
       -
             );

     

       206
       -
           }

     

       207
       -
       

     

       208
       -
           String? callbackUrl;

     

       209
       -
           try {

     

       210
       -
             if (kDebugMode) {

     

       211
       -
               print('📱 Calling FlutterWebAuth2.authenticate()...');

     

       212
       -
             }

     

       213
       -
       

     

       214
       -
             callbackUrl = await FlutterWebAuth2.authenticate(

     

       215
       -
               url: authUrl.toString(),

     

       216
       -
               callbackUrlScheme: callbackUrlScheme,

     

       217
       -
               options: const FlutterWebAuth2Options(

     

       218
       -
                 // Use ephemeral session to force browser to close immediately

     

       219
       -
                 // This prevents browser retry that can invalidate the authorization code

     

       220
       -
                 preferEphemeral: true,

     

       221
       -
                 timeout: 300, // 5 minutes timeout

     

       222
       -
               ),

     

       223
       -
             );

     

       224
       -
       

     

       225
       -
             if (kDebugMode) {

     

       226
       -
               print('✅ FlutterWebAuth2 returned successfully!');

     

       227
       -
               print('   Callback URL: $callbackUrl');

     

       228
       -
               print(

     

       229
       -
                 '   ⏱️  Callback received at: ${DateTime.now().toIso8601String()}',

     

       230
       -
               );

     

       231
       -
             }

     

       232
       -
           } catch (e, stackTrace) {

     

       233
       -
             if (kDebugMode) {

     

       234
       -
               print('❌ FlutterWebAuth2.authenticate() threw an error:');

     

       235
       -
               print('   Error type: ${e.runtimeType}');

     

       236
       -
               print('   Error message: $e');

     

       237
       -
               print('   Stack trace: $stackTrace');

     

       238
       -
             }

     

       239
       -
             rethrow;

     

       240
       -
           }

     

       241
       -
       

     

       242
       -
           // Step 3: Parse callback URL parameters

     

       243
       -
           final uri = Uri.parse(callbackUrl);

     

       244
       -
           final params =

     

       245
       -
               responseMode == OAuthResponseMode.fragment

     

       246
       -
                   ? _parseFragment(uri.fragment)

     

       247
       -
                   : Map<String, String>.from(uri.queryParameters);

     

       248
       -
       

     

       249
       -
           if (kDebugMode) {

     

       250
       -
             print('🔄 Parsing callback parameters...');

     

       251
       -
             print('   Response mode: $responseMode');

     

       252
       -
             print('   Callback params: $params');

     

       253
       -
           }

     

       254
       -
       

     

       255
       -
           // Step 4: Complete OAuth flow

     

       256
       -
           if (kDebugMode) {

     

       257
       -
             print('📞 Calling callback() to exchange code for tokens...');

     

       258
       -
             print('   Redirect URI: $redirectUri');

     

       259
       -
           }

     

       260
       -
       

     

       261
       -
           final result = await callback(

     

       262
       -
             params,

     

       263
       -
             options: CallbackOptions(redirectUri: redirectUri),

     

       264
       -
             cancelToken: cancelToken,

     

       265
       -
           );

     

       266
       -
       

     

       267
       -
           if (kDebugMode) {

     

       268
       -
             print('✅ Token exchange successful!');

     

       269
       -
             print('   Session DID: ${result.session.sub}');

     

       270
       -
           }

     

       271
       -
       

     

       272
       -
           return result.session;

     

       273
       -
         }

     

       274
       -
       

     

       275
       -
         /// Extracts the URL scheme from a redirect URI.

     

       276
       -
         ///

     

       277
       -
         /// Examples:

     

       278
       -
         /// - "myapp://oauth/callback" → "myapp"

     

       279
       -
         /// - "https://example.com/callback" → "https"

     

       280
       -
         String _extractScheme(String redirectUri) {

     

       281
       -
           final uri = Uri.parse(redirectUri);

     

       282
       -
           return uri.scheme;

     

       283
       -
         }

     

       284
       -
       

     

       285
       -
         /// Parses URL fragment into a parameter map.

     

       286
       -
         ///

     

       287
       -
         /// The fragment may start with '#' which we strip.

     

       288
       -
         Map<String, String> _parseFragment(String fragment) {

     

       289
       -
           // Remove leading '#' if present

     

       290
       -
           final clean = fragment.startsWith('#') ? fragment.substring(1) : fragment;

     

       291
       -
           if (clean.isEmpty) return {};

     

       292
       -
       

     

       293
       -
           final params = <String, String>{};

     

       294
       -
           for (final pair in clean.split('&')) {

     

       295
       -
             final parts = pair.split('=');

     

       296
       -
             if (parts.length == 2) {

     

       297
       -
               params[Uri.decodeComponent(parts[0])] = Uri.decodeComponent(parts[1]);

     

       298
       -
             }

     

       299
       -
           }

     

       300
       -
           return params;

     

       301
       -
         }

     

       302
       -
       }

-141

packages/atproto_oauth_flutter/lib/src/platform/flutter_oauth_router_helper.dart

···

       1
       -
       /// Helper for configuring Flutter routers to work with OAuth callbacks.

     

       2
       -
       ///

     

       3
       -
       /// When using declarative routing packages (go_router, auto_route, etc.),

     

       4
       -
       /// OAuth callback deep links may be intercepted before flutter_web_auth_2

     

       5
       -
       /// can handle them. This helper provides utilities to configure your router

     

       6
       -
       /// to ignore OAuth callback URIs.

     

       7
       -
       ///

     

       8
       -
       /// ## go_router Example

     

       9
       -
       ///

     

       10
       -
       /// ```dart

     

       11
       -
       /// final router = GoRouter(

     

       12
       -
       ///   routes: [...],

     

       13
       -
       ///   redirect: FlutterOAuthRouterHelper.createGoRouterRedirect(

     

       14
       -
       ///     customSchemes: ['com.example.myapp'],

     

       15
       -
       ///   ),

     

       16
       -
       /// );

     

       17
       -
       /// ```

     

       18
       -
       ///

     

       19
       -
       /// ## Manual Configuration

     

       20
       -
       ///

     

       21
       -
       /// ```dart

     

       22
       -
       /// final router = GoRouter(

     

       23
       -
       ///   routes: [...],

     

       24
       -
       ///   redirect: (context, state) {

     

       25
       -
       ///     if (FlutterOAuthRouterHelper.isOAuthCallback(

     

       26
       -
       ///       state.uri,

     

       27
       -
       ///       customSchemes: ['com.example.myapp'],

     

       28
       -
       ///     )) {

     

       29
       -
       ///       return null; // Let flutter_web_auth_2 handle it

     

       30
       -
       ///     }

     

       31
       -
       ///     return null; // Normal routing

     

       32
       -
       ///   },

     

       33
       -
       /// );

     

       34
       -
       /// ```

     

       35
       -
       library;

     

       36
       -
       

     

       37
       -
       import 'dart:async';

     

       38
       -
       import 'package:flutter/foundation.dart';

     

       39
       -
       import 'package:flutter/widgets.dart';

     

       40
       -
       

     

       41
       -
       /// Helper class for configuring routers to work with OAuth callbacks.

     

       42
       -
       class FlutterOAuthRouterHelper {

     

       43
       -
         /// Checks if a URI is an OAuth callback that should be ignored by the router.

     

       44
       -
         ///

     

       45
       -
         /// Returns `true` if the URI uses a custom scheme from [customSchemes],

     

       46
       -
         /// indicating it's an OAuth callback deep link that flutter_web_auth_2

     

       47
       -
         /// should handle.

     

       48
       -
         ///

     

       49
       -
         /// Example:

     

       50
       -
         /// ```dart

     

       51
       -
         /// if (FlutterOAuthRouterHelper.isOAuthCallback(

     

       52
       -
         ///   uri,

     

       53
       -
         ///   customSchemes: ['com.example.myapp'],

     

       54
       -
         /// )) {

     

       55
       -
         ///   // This is an OAuth callback - don't route it

     

       56
       -
         ///   return null;

     

       57
       -
         /// }

     

       58
       -
         /// ```

     

       59
       -
         static bool isOAuthCallback(Uri uri, {required List<String> customSchemes}) {

     

       60
       -
           return customSchemes.contains(uri.scheme);

     

       61
       -
         }

     

       62
       -
       

     

       63
       -
         /// Creates a redirect function for go_router that ignores OAuth callbacks.

     

       64
       -
         ///

     

       65
       -
         /// This is a convenience method that returns a redirect function you can

     

       66
       -
         /// pass directly to GoRouter's `redirect` parameter.

     

       67
       -
         ///

     

       68
       -
         /// Parameters:

     

       69
       -
         /// - [customSchemes]: List of custom URL schemes used for OAuth callbacks

     

       70
       -
         ///   (e.g., `['com.example.myapp']`)

     

       71
       -
         /// - [fallbackRedirect]: Optional custom redirect logic for non-OAuth URIs

     

       72
       -
         ///

     

       73
       -
         /// Example:

     

       74
       -
         /// ```dart

     

       75
       -
         /// final router = GoRouter(

     

       76
       -
         ///   routes: [...],

     

       77
       -
         ///   redirect: FlutterOAuthRouterHelper.createGoRouterRedirect(

     

       78
       -
         ///     customSchemes: ['com.example.myapp'],

     

       79
       -
         ///   ),

     

       80
       -
         /// );

     

       81
       -
         /// ```

     

       82
       -
         ///

     

       83
       -
         /// With custom redirect logic:

     

       84
       -
         /// ```dart

     

       85
       -
         /// final router = GoRouter(

     

       86
       -
         ///   routes: [...],

     

       87
       -
         ///   redirect: FlutterOAuthRouterHelper.createGoRouterRedirect(

     

       88
       -
         ///     customSchemes: ['com.example.myapp'],

     

       89
       -
         ///     fallbackRedirect: (context, state) {

     

       90
       -
         ///       // Your custom auth redirect logic

     

       91
       -
         ///       if (!isAuthenticated) return '/login';

     

       92
       -
         ///       return null;

     

       93
       -
         ///     },

     

       94
       -
         ///   ),

     

       95
       -
         /// );

     

       96
       -
         /// ```

     

       97
       -
         static FutureOr<String?> Function(BuildContext, dynamic)

     

       98
       -
         createGoRouterRedirect({

     

       99
       -
           required List<String> customSchemes,

     

       100
       -
           FutureOr<String?> Function(BuildContext, dynamic)? fallbackRedirect,

     

       101
       -
         }) {

     

       102
       -
           return (BuildContext context, dynamic state) {

     

       103
       -
             // Extract URI from the state object (works with any router's state object that has a 'uri' property)

     

       104
       -
             final uri = (state as dynamic).uri as Uri;

     

       105
       -
       

     

       106
       -
             // Check if this is an OAuth callback

     

       107
       -
             if (isOAuthCallback(uri, customSchemes: customSchemes)) {

     

       108
       -
               // Let flutter_web_auth_2 handle OAuth callbacks

     

       109
       -
               if (kDebugMode) {

     

       110
       -
                 print('🔀 RouterHelper: Detected OAuth callback - allowing through');

     

       111
       -
                 print('   URI: $uri');

     

       112
       -
               }

     

       113
       -
               return null;

     

       114
       -
             }

     

       115
       -
       

     

       116
       -
             // Apply custom redirect logic if provided

     

       117
       -
             if (fallbackRedirect != null) {

     

       118
       -
               return fallbackRedirect(context, state);

     

       119
       -
             }

     

       120
       -
       

     

       121
       -
             // No redirect needed

     

       122
       -
             return null;

     

       123
       -
           };

     

       124
       -
         }

     

       125
       -
       

     

       126
       -
         /// Extracts the scheme from a redirect URI.

     

       127
       -
         ///

     

       128
       -
         /// This is useful for getting the custom scheme from your OAuth configuration.

     

       129
       -
         ///

     

       130
       -
         /// Example:

     

       131
       -
         /// ```dart

     

       132
       -
         /// final scheme = FlutterOAuthRouterHelper.extractScheme(

     

       133
       -
         ///   'com.example.myapp:/oauth/callback'

     

       134
       -
         /// );

     

       135
       -
         /// // Returns: 'com.example.myapp'

     

       136
       -
         /// ```

     

       137
       -
         static String extractScheme(String redirectUri) {

     

       138
       -
           final uri = Uri.parse(redirectUri);

     

       139
       -
           return uri.scheme;

     

       140
       -
         }

     

       141
       -
       }

-91

packages/atproto_oauth_flutter/lib/src/platform/flutter_runtime.dart

···

       1
       -
       import 'dart:math';

     

       2
       -
       import 'dart:typed_data';

     

       3
       -
       

     

       4
       -
       import 'package:crypto/crypto.dart' as crypto;

     

       5
       -
       

     

       6
       -
       import '../runtime/runtime_implementation.dart';

     

       7
       -
       import '../utils/lock.dart';

     

       8
       -
       import 'flutter_key.dart';

     

       9
       -
       

     

       10
       -
       /// Flutter implementation of RuntimeImplementation.

     

       11
       -
       ///

     

       12
       -
       /// Provides cryptographic operations for OAuth flows using:

     

       13
       -
       /// - pointycastle for EC key generation (via FlutterKey)

     

       14
       -
       /// - crypto package for SHA hashing

     

       15
       -
       /// - Random.secure() for cryptographically secure random values

     

       16
       -
       /// - requestLocalLock for concurrency control

     

       17
       -
       ///

     

       18
       -
       /// This implementation supports:

     

       19
       -
       /// - ES256, ES384, ES512, ES256K (Elliptic Curve algorithms)

     

       20
       -
       /// - SHA-256, SHA-384, SHA-512 (Hash algorithms)

     

       21
       -
       /// - Secure random number generation

     

       22
       -
       /// - Local (in-memory) locking for token refresh

     

       23
       -
       ///

     

       24
       -
       /// Example:

     

       25
       -
       /// ```dart

     

       26
       -
       /// final runtime = FlutterRuntime();

     

       27
       -
       ///

     

       28
       -
       /// // Generate a key

     

       29
       -
       /// final key = await runtime.createKey(['ES256', 'ES384']);

     

       30
       -
       ///

     

       31
       -
       /// // Hash some data

     

       32
       -
       /// final hash = await runtime.digest(

     

       33
       -
       ///   Uint8List.fromList([1, 2, 3]),

     

       34
       -
       ///   DigestAlgorithm.sha256(),

     

       35
       -
       /// );

     

       36
       -
       ///

     

       37
       -
       /// // Generate random bytes

     

       38
       -
       /// final random = await runtime.getRandomValues(32);

     

       39
       -
       /// ```

     

       40
       -
       class FlutterRuntime implements RuntimeImplementation {

     

       41
       -
         /// Creates a FlutterRuntime instance.

     

       42
       -
         const FlutterRuntime();

     

       43
       -
       

     

       44
       -
         @override

     

       45
       -
         RuntimeKeyFactory get createKey {

     

       46
       -
           return (List<String> algs) async {

     

       47
       -
             return FlutterKey.generate(algs);

     

       48
       -
           };

     

       49
       -
         }

     

       50
       -
       

     

       51
       -
         @override

     

       52
       -
         RuntimeDigest get digest {

     

       53
       -
           return (Uint8List bytes, DigestAlgorithm algorithm) async {

     

       54
       -
             switch (algorithm.name) {

     

       55
       -
               case 'sha256':

     

       56
       -
               case 'SHA-256':

     

       57
       -
                 return Uint8List.fromList(crypto.sha256.convert(bytes).bytes);

     

       58
       -
       

     

       59
       -
               case 'sha384':

     

       60
       -
               case 'SHA-384':

     

       61
       -
                 return Uint8List.fromList(crypto.sha384.convert(bytes).bytes);

     

       62
       -
       

     

       63
       -
               case 'sha512':

     

       64
       -
               case 'SHA-512':

     

       65
       -
                 return Uint8List.fromList(crypto.sha512.convert(bytes).bytes);

     

       66
       -
       

     

       67
       -
               default:

     

       68
       -
                 throw UnsupportedError(

     

       69
       -
                   'Unsupported digest algorithm: ${algorithm.name}',

     

       70
       -
                 );

     

       71
       -
             }

     

       72
       -
           };

     

       73
       -
         }

     

       74
       -
       

     

       75
       -
         @override

     

       76
       -
         RuntimeRandomValues get getRandomValues {

     

       77
       -
           return (int length) async {

     

       78
       -
             final random = Random.secure();

     

       79
       -
             return Uint8List.fromList(

     

       80
       -
               List.generate(length, (_) => random.nextInt(256)),

     

       81
       -
             );

     

       82
       -
           };

     

       83
       -
         }

     

       84
       -
       

     

       85
       -
         @override

     

       86
       -
         RuntimeLock get requestLock {

     

       87
       -
           // Use the local lock implementation from utils/lock.dart

     

       88
       -
           // This prevents concurrent token refresh within a single isolate

     

       89
       -
           return requestLocalLock;

     

       90
       -
         }

     

       91
       -
       }

-341

packages/atproto_oauth_flutter/lib/src/platform/flutter_stores.dart

···

       1
       -
       import 'dart:convert';

     

       2
       -
       

     

       3
       -
       import 'package:flutter_secure_storage/flutter_secure_storage.dart';

     

       4
       -
       

     

       5
       -
       import '../identity/did_document.dart';

     

       6
       -
       import '../identity/did_resolver.dart';

     

       7
       -
       import '../identity/handle_resolver.dart';

     

       8
       -
       import '../oauth/authorization_server_metadata_resolver.dart';

     

       9
       -
       import '../oauth/oauth_server_agent.dart';

     

       10
       -
       import '../oauth/protected_resource_metadata_resolver.dart';

     

       11
       -
       import '../session/oauth_session.dart';

     

       12
       -
       import '../session/session_getter.dart';

     

       13
       -
       import '../session/state_store.dart';

     

       14
       -
       import '../util.dart';

     

       15
       -
       

     

       16
       -
       // ============================================================================

     

       17
       -
       // Session and State Storage (uses flutter_secure_storage)

     

       18
       -
       // ============================================================================

     

       19
       -
       

     

       20
       -
       /// Flutter implementation of SessionStore using flutter_secure_storage.

     

       21
       -
       ///

     

       22
       -
       /// This stores OAuth sessions (tokens and keys) in the device's secure storage:

     

       23
       -
       /// - iOS: Keychain

     

       24
       -
       /// - Android: EncryptedSharedPreferences

     

       25
       -
       ///

     

       26
       -
       /// Sessions are persisted across app restarts and are encrypted at rest.

     

       27
       -
       ///

     

       28
       -
       /// Example:

     

       29
       -
       /// ```dart

     

       30
       -
       /// final store = FlutterSessionStore();

     

       31
       -
       /// await store.set('did:plc:abc123', session);

     

       32
       -
       /// final restored = await store.get('did:plc:abc123');

     

       33
       -
       /// ```

     

       34
       -
       class FlutterSessionStore implements SessionStore {

     

       35
       -
         final FlutterSecureStorage _storage;

     

       36
       -
         static const _prefix = 'atproto_session_';

     

       37
       -
       

     

       38
       -
         FlutterSessionStore([FlutterSecureStorage? storage])

     

       39
       -
           : _storage =

     

       40
       -
                 storage ??

     

       41
       -
                 const FlutterSecureStorage(

     

       42
       -
                   aOptions: AndroidOptions(encryptedSharedPreferences: true),

     

       43
       -
                 );

     

       44
       -
       

     

       45
       -
         @override

     

       46
       -
         Future<Session?> get(String key, {CancellationToken? signal}) async {

     

       47
       -
           try {

     

       48
       -
             final json = await _storage.read(key: _prefix + key);

     

       49
       -
             if (json == null) return null;

     

       50
       -
       

     

       51
       -
             final data = jsonDecode(json) as Map<String, dynamic>;

     

       52
       -
             return Session.fromJson(data);

     

       53
       -
           } catch (e) {

     

       54
       -
             return null;

     

       55
       -
           }

     

       56
       -
         }

     

       57
       -
       

     

       58
       -
         @override

     

       59
       -
         Future<void> set(String key, Session value) async {

     

       60
       -
           final json = jsonEncode(value.toJson());

     

       61
       -
           await _storage.write(key: _prefix + key, value: json);

     

       62
       -
         }

     

       63
       -
       

     

       64
       -
         @override

     

       65
       -
         Future<void> del(String key) async {

     

       66
       -
           await _storage.delete(key: _prefix + key);

     

       67
       -
         }

     

       68
       -
       

     

       69
       -
         @override

     

       70
       -
         Future<void> clear() async {

     

       71
       -
           // Delete all session keys

     

       72
       -
           final all = await _storage.readAll();

     

       73
       -
           for (final key in all.keys) {

     

       74
       -
             if (key.startsWith(_prefix)) {

     

       75
       -
               await _storage.delete(key: key);

     

       76
       -
             }

     

       77
       -
           }

     

       78
       -
         }

     

       79
       -
       }

     

       80
       -
       

     

       81
       -
       /// Flutter implementation of StateStore for ephemeral OAuth state.

     

       82
       -
       ///

     

       83
       -
       /// This stores temporary state data during the OAuth authorization flow.

     

       84
       -
       /// State data includes PKCE verifiers, nonces, and application state.

     

       85
       -
       ///

     

       86
       -
       /// Uses in-memory storage since state is short-lived (only needed during the

     

       87
       -
       /// authorization flow, which typically completes within minutes).

     

       88
       -
       ///

     

       89
       -
       /// Example:

     

       90
       -
       /// ```dart

     

       91
       -
       /// final store = FlutterStateStore();

     

       92
       -
       /// await store.set('state123', InternalStateData(...));

     

       93
       -
       /// final state = await store.get('state123');

     

       94
       -
       /// await store.del('state123'); // Clean up after use

     

       95
       -
       /// ```

     

       96
       -
       class FlutterStateStore implements StateStore {

     

       97
       -
         final Map<String, InternalStateData> _store = {};

     

       98
       -
       

     

       99
       -
         @override

     

       100
       -
         Future<InternalStateData?> get(String key) async {

     

       101
       -
           return _store[key];

     

       102
       -
         }

     

       103
       -
       

     

       104
       -
         @override

     

       105
       -
         Future<void> set(String key, InternalStateData data) async {

     

       106
       -
           _store[key] = data;

     

       107
       -
         }

     

       108
       -
       

     

       109
       -
         @override

     

       110
       -
         Future<void> del(String key) async {

     

       111
       -
           _store.remove(key);

     

       112
       -
         }

     

       113
       -
       

     

       114
       -
         @override

     

       115
       -
         Future<void> clear() async {

     

       116
       -
           _store.clear();

     

       117
       -
         }

     

       118
       -
       }

     

       119
       -
       

     

       120
       -
       // ============================================================================

     

       121
       -
       // In-Memory Caches with TTL

     

       122
       -
       // ============================================================================

     

       123
       -
       

     

       124
       -
       /// Base class for in-memory caches with time-to-live (TTL).

     

       125
       -
       ///

     

       126
       -
       /// This provides a generic caching mechanism with automatic expiration.

     

       127
       -
       /// Cached items are stored with a timestamp and are considered stale

     

       128
       -
       /// after the TTL period.

     

       129
       -
       class _InMemoryCache<V> {

     

       130
       -
         final Map<String, _CacheEntry<V>> _cache = {};

     

       131
       -
         final Duration _ttl;

     

       132
       -
       

     

       133
       -
         _InMemoryCache(this._ttl);

     

       134
       -
       

     

       135
       -
         Future<V?> get(String key) async {

     

       136
       -
           final entry = _cache[key];

     

       137
       -
           if (entry == null) return null;

     

       138
       -
       

     

       139
       -
           // Check if expired

     

       140
       -
           if (DateTime.now().isAfter(entry.expiresAt)) {

     

       141
       -
             _cache.remove(key);

     

       142
       -
             return null;

     

       143
       -
           }

     

       144
       -
       

     

       145
       -
           return entry.value;

     

       146
       -
         }

     

       147
       -
       

     

       148
       -
         Future<void> set(String key, V value) async {

     

       149
       -
           _cache[key] = _CacheEntry(

     

       150
       -
             value: value,

     

       151
       -
             expiresAt: DateTime.now().add(_ttl),

     

       152
       -
           );

     

       153
       -
         }

     

       154
       -
       

     

       155
       -
         Future<void> del(String key) async {

     

       156
       -
           _cache.remove(key);

     

       157
       -
         }

     

       158
       -
       

     

       159
       -
         Future<void> clear() async {

     

       160
       -
           _cache.clear();

     

       161
       -
         }

     

       162
       -
       

     

       163
       -
         /// Removes expired entries from the cache.

     

       164
       -
         void purge() {

     

       165
       -
           final now = DateTime.now();

     

       166
       -
           _cache.removeWhere((_, entry) => now.isAfter(entry.expiresAt));

     

       167
       -
         }

     

       168
       -
       }

     

       169
       -
       

     

       170
       -
       /// Cache entry with expiration time.

     

       171
       -
       class _CacheEntry<V> {

     

       172
       -
         final V value;

     

       173
       -
         final DateTime expiresAt;

     

       174
       -
       

     

       175
       -
         _CacheEntry({required this.value, required this.expiresAt});

     

       176
       -
       }

     

       177
       -
       

     

       178
       -
       /// In-memory cache for OAuth Authorization Server metadata.

     

       179
       -
       ///

     

       180
       -
       /// Caches metadata fetched from /.well-known/oauth-authorization-server

     

       181
       -
       /// to avoid redundant network requests.

     

       182
       -
       ///

     

       183
       -
       /// Default TTL: 1 minute (metadata rarely changes)

     

       184
       -
       ///

     

       185
       -
       /// Example:

     

       186
       -
       /// ```dart

     

       187
       -
       /// final cache = InMemoryAuthorizationServerMetadataCache();

     

       188
       -
       /// await cache.set('https://auth.example.com', metadata);

     

       189
       -
       /// final cached = await cache.get('https://auth.example.com');

     

       190
       -
       /// ```

     

       191
       -
       class InMemoryAuthorizationServerMetadataCache

     

       192
       -
           implements AuthorizationServerMetadataCache {

     

       193
       -
         final _InMemoryCache<Map<String, dynamic>> _cache;

     

       194
       -
       

     

       195
       -
         InMemoryAuthorizationServerMetadataCache({

     

       196
       -
           Duration ttl = const Duration(minutes: 1),

     

       197
       -
         }) : _cache = _InMemoryCache(ttl);

     

       198
       -
       

     

       199
       -
         @override

     

       200
       -
         Future<Map<String, dynamic>?> get(String key, {CancellationToken? signal}) =>

     

       201
       -
             _cache.get(key);

     

       202
       -
       

     

       203
       -
         @override

     

       204
       -
         Future<void> set(String key, Map<String, dynamic> value) =>

     

       205
       -
             _cache.set(key, value);

     

       206
       -
       

     

       207
       -
         @override

     

       208
       -
         Future<void> del(String key) => _cache.del(key);

     

       209
       -
       

     

       210
       -
         @override

     

       211
       -
         Future<void> clear() => _cache.clear();

     

       212
       -
       }

     

       213
       -
       

     

       214
       -
       /// In-memory cache for OAuth Protected Resource metadata.

     

       215
       -
       ///

     

       216
       -
       /// Caches metadata fetched from /.well-known/oauth-protected-resource

     

       217
       -
       /// to avoid redundant network requests.

     

       218
       -
       ///

     

       219
       -
       /// Default TTL: 1 minute (metadata rarely changes)

     

       220
       -
       ///

     

       221
       -
       /// Example:

     

       222
       -
       /// ```dart

     

       223
       -
       /// final cache = InMemoryProtectedResourceMetadataCache();

     

       224
       -
       /// await cache.set('https://pds.example.com', metadata);

     

       225
       -
       /// ```

     

       226
       -
       class InMemoryProtectedResourceMetadataCache

     

       227
       -
           implements ProtectedResourceMetadataCache {

     

       228
       -
         final _InMemoryCache<Map<String, dynamic>> _cache;

     

       229
       -
       

     

       230
       -
         InMemoryProtectedResourceMetadataCache({

     

       231
       -
           Duration ttl = const Duration(minutes: 1),

     

       232
       -
         }) : _cache = _InMemoryCache(ttl);

     

       233
       -
       

     

       234
       -
         @override

     

       235
       -
         Future<Map<String, dynamic>?> get(String key, {CancellationToken? signal}) =>

     

       236
       -
             _cache.get(key);

     

       237
       -
       

     

       238
       -
         @override

     

       239
       -
         Future<void> set(String key, Map<String, dynamic> value) =>

     

       240
       -
             _cache.set(key, value);

     

       241
       -
       

     

       242
       -
         @override

     

       243
       -
         Future<void> del(String key) => _cache.del(key);

     

       244
       -
       

     

       245
       -
         @override

     

       246
       -
         Future<void> clear() => _cache.clear();

     

       247
       -
       }

     

       248
       -
       

     

       249
       -
       /// In-memory cache for DPoP nonces.

     

       250
       -
       ///

     

       251
       -
       /// DPoP nonces are server-provided values used for replay protection.

     

       252
       -
       /// They're cached per authorization/resource server origin.

     

       253
       -
       ///

     

       254
       -
       /// Default TTL: 10 minutes (nonces typically have short lifetimes)

     

       255
       -
       ///

     

       256
       -
       /// Example:

     

       257
       -
       /// ```dart

     

       258
       -
       /// final cache = InMemoryDpopNonceCache();

     

       259
       -
       /// await cache.set('https://auth.example.com', 'nonce123');

     

       260
       -
       /// final nonce = await cache.get('https://auth.example.com');

     

       261
       -
       /// ```

     

       262
       -
       class InMemoryDpopNonceCache implements DpopNonceCache {

     

       263
       -
         final _InMemoryCache<String> _cache;

     

       264
       -
       

     

       265
       -
         InMemoryDpopNonceCache({Duration ttl = const Duration(minutes: 10)})

     

       266
       -
           : _cache = _InMemoryCache(ttl);

     

       267
       -
       

     

       268
       -
         @override

     

       269
       -
         Future<String?> get(String key, {CancellationToken? signal}) =>

     

       270
       -
             _cache.get(key);

     

       271
       -
       

     

       272
       -
         @override

     

       273
       -
         Future<void> set(String key, String value) => _cache.set(key, value);

     

       274
       -
       

     

       275
       -
         @override

     

       276
       -
         Future<void> del(String key) => _cache.del(key);

     

       277
       -
       

     

       278
       -
         @override

     

       279
       -
         Future<void> clear() => _cache.clear();

     

       280
       -
       }

     

       281
       -
       

     

       282
       -
       /// In-memory cache for DID documents.

     

       283
       -
       ///

     

       284
       -
       /// Caches resolved DID documents (from DidDocument class) to avoid redundant

     

       285
       -
       /// resolution requests.

     

       286
       -
       ///

     

       287
       -
       /// Default TTL: 1 minute (DID documents can change but not frequently)

     

       288
       -
       ///

     

       289
       -
       /// Note: DidDocument is a complex class, but it has toJson/fromJson methods.

     

       290
       -
       /// We store the JSON representation and reconstruct on retrieval.

     

       291
       -
       ///

     

       292
       -
       /// Example:

     

       293
       -
       /// ```dart

     

       294
       -
       /// final cache = FlutterDidCache();

     

       295
       -
       /// await cache.set('did:plc:abc123', didDocument);

     

       296
       -
       /// final doc = await cache.get('did:plc:abc123');

     

       297
       -
       /// ```

     

       298
       -
       class FlutterDidCache implements DidCache {

     

       299
       -
         final _InMemoryCache<DidDocument> _cache;

     

       300
       -
       

     

       301
       -
         FlutterDidCache({Duration ttl = const Duration(minutes: 1)})

     

       302
       -
           : _cache = _InMemoryCache(ttl);

     

       303
       -
       

     

       304
       -
         @override

     

       305
       -
         Future<DidDocument?> get(String key) => _cache.get(key);

     

       306
       -
       

     

       307
       -
         @override

     

       308
       -
         Future<void> set(String key, DidDocument value) => _cache.set(key, value);

     

       309
       -
       

     

       310
       -
         @override

     

       311
       -
         Future<void> clear() => _cache.clear();

     

       312
       -
       }

     

       313
       -
       

     

       314
       -
       /// In-memory cache for handle → DID resolutions.

     

       315
       -
       ///

     

       316
       -
       /// Caches the resolution of atProto handles (e.g., "alice.bsky.social") to DIDs.

     

       317
       -
       /// The cache stores simple string mappings (handle → DID).

     

       318
       -
       ///

     

       319
       -
       /// Default TTL: 1 minute (handles can be reassigned but not frequently)

     

       320
       -
       ///

     

       321
       -
       /// Example:

     

       322
       -
       /// ```dart

     

       323
       -
       /// final cache = FlutterHandleCache();

     

       324
       -
       /// await cache.set('alice.bsky.social', 'did:plc:abc123');

     

       325
       -
       /// final did = await cache.get('alice.bsky.social');

     

       326
       -
       /// ```

     

       327
       -
       class FlutterHandleCache implements HandleCache {

     

       328
       -
         final _InMemoryCache<String> _cache;

     

       329
       -
       

     

       330
       -
         FlutterHandleCache({Duration ttl = const Duration(minutes: 1)})

     

       331
       -
           : _cache = _InMemoryCache(ttl);

     

       332
       -
       

     

       333
       -
         @override

     

       334
       -
         Future<String?> get(String key) => _cache.get(key);

     

       335
       -
       

     

       336
       -
         @override

     

       337
       -
         Future<void> set(String key, String value) => _cache.set(key, value);

     

       338
       -
       

     

       339
       -
         @override

     

       340
       -
         Future<void> clear() => _cache.clear();

     

       341
       -
       }

-280

packages/atproto_oauth_flutter/lib/src/runtime/runtime.dart

···

       1
       -
       import 'dart:convert';

     

       2
       -
       import 'dart:typed_data';

     

       3
       -
       

     

       4
       -
       import '../utils/lock.dart';

     

       5
       -
       import 'runtime_implementation.dart';

     

       6
       -
       

     

       7
       -
       /// Main runtime class that wraps a RuntimeImplementation and provides

     

       8
       -
       /// high-level cryptographic operations for OAuth.

     

       9
       -
       ///

     

       10
       -
       /// This class handles:

     

       11
       -
       /// - Key generation with algorithm preference sorting

     

       12
       -
       /// - SHA-256 hashing with base64url encoding

     

       13
       -
       /// - Nonce generation

     

       14
       -
       /// - PKCE (Proof Key for Code Exchange) generation

     

       15
       -
       /// - JWK thumbprint calculation

     

       16
       -
       ///

     

       17
       -
       /// All operations use the underlying RuntimeImplementation for

     

       18
       -
       /// platform-specific cryptographic primitives.

     

       19
       -
       class Runtime {

     

       20
       -
         final RuntimeImplementation _implementation;

     

       21
       -
       

     

       22
       -
         /// Whether the implementation provides a custom lock mechanism.

     

       23
       -
         final bool hasImplementationLock;

     

       24
       -
       

     

       25
       -
         /// The lock function to use (either custom or local fallback).

     

       26
       -
         final RuntimeLock usingLock;

     

       27
       -
       

     

       28
       -
         Runtime(this._implementation)

     

       29
       -
           : hasImplementationLock = _implementation.requestLock != null,

     

       30
       -
             usingLock = _implementation.requestLock ?? requestLocalLock;

     

       31
       -
       

     

       32
       -
         /// Generates a cryptographic key that supports the given algorithms.

     

       33
       -
         ///

     

       34
       -
         /// The algorithms are sorted by preference before being passed to the

     

       35
       -
         /// key factory. This ensures consistent key selection across platforms.

     

       36
       -
         ///

     

       37
       -
         /// Algorithm preference order (most to least preferred):

     

       38
       -
         /// 1. ES256K (secp256k1)

     

       39
       -
         /// 2. ES256, ES384, ES512 (elliptic curve, shorter keys first)

     

       40
       -
         /// 3. PS256, PS384, PS512 (RSA-PSS, shorter keys first)

     

       41
       -
         /// 4. RS256, RS384, RS512 (RSA-PKCS1, shorter keys first)

     

       42
       -
         /// 5. Other algorithms (maintain original order)

     

       43
       -
         ///

     

       44
       -
         /// Example:

     

       45
       -
         /// ```dart

     

       46
       -
         /// final key = await runtime.generateKey(['ES256', 'RS256', 'ES384']);

     

       47
       -
         /// // Returns key supporting ES256 (preferred over RS256 and ES384)

     

       48
       -
         /// ```

     

       49
       -
         Future<Key> generateKey(List<String> algs) async {

     

       50
       -
           final algsSorted = List<String>.from(algs)..sort(_compareAlgos);

     

       51
       -
           return _implementation.createKey(algsSorted);

     

       52
       -
         }

     

       53
       -
       

     

       54
       -
         /// Computes the SHA-256 hash of the input text and returns it as base64url.

     

       55
       -
         ///

     

       56
       -
         /// This is used extensively in OAuth for:

     

       57
       -
         /// - PKCE code challenge (S256 method)

     

       58
       -
         /// - JWK thumbprint calculation

     

       59
       -
         /// - DPoP access token hash (ath claim)

     

       60
       -
         ///

     

       61
       -
         /// Example:

     

       62
       -
         /// ```dart

     

       63
       -
         /// final hash = await runtime.sha256('hello world');

     

       64
       -
         /// // Returns base64url-encoded SHA-256 hash

     

       65
       -
         /// ```

     

       66
       -
         Future<String> sha256(String text) async {

     

       67
       -
           final bytes = utf8.encode(text);

     

       68
       -
           final digest = await _implementation.digest(

     

       69
       -
             Uint8List.fromList(bytes),

     

       70
       -
             const DigestAlgorithm.sha256(),

     

       71
       -
           );

     

       72
       -
           return _base64UrlEncode(digest);

     

       73
       -
         }

     

       74
       -
       

     

       75
       -
         /// Generates a cryptographically secure random nonce.

     

       76
       -
         ///

     

       77
       -
         /// The nonce is base64url-encoded and has the specified byte length

     

       78
       -
         /// (default 16 bytes = 128 bits of entropy).

     

       79
       -
         ///

     

       80
       -
         /// Used for:

     

       81
       -
         /// - OAuth state parameter

     

       82
       -
         /// - OIDC nonce parameter

     

       83
       -
         /// - DPoP jti (JWT ID) claim

     

       84
       -
         ///

     

       85
       -
         /// Example:

     

       86
       -
         /// ```dart

     

       87
       -
         /// final nonce = await runtime.generateNonce(); // 16 bytes

     

       88
       -
         /// final longNonce = await runtime.generateNonce(32); // 32 bytes

     

       89
       -
         /// ```

     

       90
       -
         Future<String> generateNonce([int length = 16]) async {

     

       91
       -
           final bytes = await _implementation.getRandomValues(length);

     

       92
       -
           return _base64UrlEncode(bytes);

     

       93
       -
         }

     

       94
       -
       

     

       95
       -
         /// Generates PKCE (Proof Key for Code Exchange) parameters.

     

       96
       -
         ///

     

       97
       -
         /// PKCE is a security extension for OAuth that prevents authorization code

     

       98
       -
         /// interception attacks. It's required for public clients (mobile/desktop apps).

     

       99
       -
         ///

     

       100
       -
         /// Returns a map with:

     

       101
       -
         /// - `verifier`: Random code verifier (base64url-encoded)

     

       102
       -
         /// - `challenge`: SHA-256 hash of verifier (base64url-encoded)

     

       103
       -
         /// - `method`: 'S256' (indicating SHA-256 hashing method)

     

       104
       -
         ///

     

       105
       -
         /// The verifier should be stored securely and sent during token exchange.

     

       106
       -
         /// The challenge is sent during authorization.

     

       107
       -
         ///

     

       108
       -
         /// See: https://datatracker.ietf.org/doc/html/rfc7636

     

       109
       -
         ///

     

       110
       -
         /// Example:

     

       111
       -
         /// ```dart

     

       112
       -
         /// final pkce = await runtime.generatePKCE();

     

       113
       -
         /// // Use pkce['challenge'] in authorization request

     

       114
       -
         /// // Store pkce['verifier'] for token exchange

     

       115
       -
         /// ```

     

       116
       -
         Future<Map<String, String>> generatePKCE([int? byteLength]) async {

     

       117
       -
           final verifier = await _generateVerifier(byteLength);

     

       118
       -
           final challenge = await sha256(verifier);

     

       119
       -
           return {'verifier': verifier, 'challenge': challenge, 'method': 'S256'};

     

       120
       -
         }

     

       121
       -
       

     

       122
       -
         /// Calculates the JWK thumbprint (jkt) for a given JSON Web Key.

     

       123
       -
         ///

     

       124
       -
         /// The thumbprint is a hash of the key's essential components, used to

     

       125
       -
         /// uniquely identify a key. For DPoP, this binds tokens to specific keys.

     

       126
       -
         ///

     

       127
       -
         /// The calculation follows RFC 7638:

     

       128
       -
         /// 1. Extract required components based on key type (kty)

     

       129
       -
         /// 2. Create canonical JSON representation

     

       130
       -
         /// 3. Compute SHA-256 hash

     

       131
       -
         /// 4. Base64url-encode the result

     

       132
       -
         ///

     

       133
       -
         /// Required components by key type:

     

       134
       -
         /// - EC: crv, kty, x, y

     

       135
       -
         /// - OKP: crv, kty, x

     

       136
       -
         /// - RSA: e, kty, n

     

       137
       -
         /// - oct: k, kty

     

       138
       -
         ///

     

       139
       -
         /// See: https://datatracker.ietf.org/doc/html/rfc7638

     

       140
       -
         ///

     

       141
       -
         /// Example:

     

       142
       -
         /// ```dart

     

       143
       -
         /// final thumbprint = await runtime.calculateJwkThumbprint(jwk);

     

       144
       -
         /// // Returns base64url-encoded SHA-256 hash of key components

     

       145
       -
         /// ```

     

       146
       -
         Future<String> calculateJwkThumbprint(Map<String, dynamic> jwk) async {

     

       147
       -
           final components = _extractJktComponents(jwk);

     

       148
       -
           final data = jsonEncode(components);

     

       149
       -
           return sha256(data);

     

       150
       -
         }

     

       151
       -
       

     

       152
       -
         /// Generates a PKCE code verifier.

     

       153
       -
         ///

     

       154
       -
         /// The verifier is a cryptographically random string that:

     

       155
       -
         /// - Has length between 43-128 characters (32-96 bytes before encoding)

     

       156
       -
         /// - Is base64url-encoded

     

       157
       -
         /// - SHOULD be 32 bytes (43 chars) per RFC 7636 recommendations

     

       158
       -
         ///

     

       159
       -
         /// See: https://datatracker.ietf.org/doc/html/rfc7636#section-4.1

     

       160
       -
         Future<String> _generateVerifier([int? byteLength]) async {

     

       161
       -
           final length = byteLength ?? 32;

     

       162
       -
       

     

       163
       -
           if (length < 32 || length > 96) {

     

       164
       -
             throw ArgumentError(

     

       165
       -
               'Invalid code_verifier length: must be between 32 and 96 bytes',

     

       166
       -
             );

     

       167
       -
           }

     

       168
       -
       

     

       169
       -
           final bytes = await _implementation.getRandomValues(length);

     

       170
       -
           return _base64UrlEncode(bytes);

     

       171
       -
         }

     

       172
       -
       

     

       173
       -
         /// Base64url encodes a byte array without padding.

     

       174
       -
         ///

     

       175
       -
         /// Base64url encoding is standard base64 with URL-safe characters:

     

       176
       -
         /// - '+' becomes '-'

     

       177
       -
         /// - '/' becomes '_'

     

       178
       -
         /// - Padding ('=') is removed

     

       179
       -
         ///

     

       180
       -
         /// This is the encoding used throughout OAuth and JWT specifications.

     

       181
       -
         String _base64UrlEncode(Uint8List bytes) {

     

       182
       -
           return base64Url.encode(bytes).replaceAll('=', '');

     

       183
       -
         }

     

       184
       -
       }

     

       185
       -
       

     

       186
       -
       /// Extracts the required components from a JWK for thumbprint calculation.

     

       187
       -
       ///

     

       188
       -
       /// This follows RFC 7638 which specifies exactly which fields to include

     

       189
       -
       /// in the thumbprint hash for each key type.

     

       190
       -
       ///

     

       191
       -
       /// The components are returned in a Map that will be serialized to JSON

     

       192
       -
       /// in lexicographic order (Dart's jsonEncode naturally does this).

     

       193
       -
       ///

     

       194
       -
       /// Throws ArgumentError if:

     

       195
       -
       /// - Required fields are missing

     

       196
       -
       /// - Key type (kty) is unsupported

     

       197
       -
       Map<String, String> _extractJktComponents(Map<String, dynamic> jwk) {

     

       198
       -
         String getRequired(String field) {

     

       199
       -
           final value = jwk[field];

     

       200
       -
           if (value is! String || value.isEmpty) {

     

       201
       -
             throw ArgumentError('"$field" parameter missing or invalid');

     

       202
       -
           }

     

       203
       -
           return value;

     

       204
       -
         }

     

       205
       -
       

     

       206
       -
         final kty = getRequired('kty');

     

       207
       -
       

     

       208
       -
         switch (kty) {

     

       209
       -
           case 'EC':

     

       210
       -
             // Elliptic Curve keys (ES256, ES384, ES512, ES256K)

     

       211
       -
             return {

     

       212
       -
               'crv': getRequired('crv'),

     

       213
       -
               'kty': kty,

     

       214
       -
               'x': getRequired('x'),

     

       215
       -
               'y': getRequired('y'),

     

       216
       -
             };

     

       217
       -
       

     

       218
       -
           case 'OKP':

     

       219
       -
             // Octet Key Pair (EdDSA)

     

       220
       -
             return {'crv': getRequired('crv'), 'kty': kty, 'x': getRequired('x')};

     

       221
       -
       

     

       222
       -
           case 'RSA':

     

       223
       -
             // RSA keys (RS256, RS384, RS512, PS256, PS384, PS512)

     

       224
       -
             return {'e': getRequired('e'), 'kty': kty, 'n': getRequired('n')};

     

       225
       -
       

     

       226
       -
           case 'oct':

     

       227
       -
             // Symmetric keys (HS256, HS384, HS512)

     

       228
       -
             return {'k': getRequired('k'), 'kty': kty};

     

       229
       -
       

     

       230
       -
           default:

     

       231
       -
             throw ArgumentError(

     

       232
       -
               '"kty" (Key Type) parameter missing or unsupported: $kty',

     

       233
       -
             );

     

       234
       -
         }

     

       235
       -
       }

     

       236
       -
       

     

       237
       -
       /// Compares two algorithm strings for preference ordering.

     

       238
       -
       ///

     

       239
       -
       /// Algorithm preference order:

     

       240
       -
       /// 1. ES256K (secp256k1) - always most preferred

     

       241
       -
       /// 2. ES* (Elliptic Curve) - prefer shorter keys

     

       242
       -
       ///    - ES256 > ES384 > ES512

     

       243
       -
       /// 3. PS* (RSA-PSS) - prefer shorter keys

     

       244
       -
       ///    - PS256 > PS384 > PS512

     

       245
       -
       /// 4. RS* (RSA-PKCS1) - prefer shorter keys

     

       246
       -
       ///    - RS256 > RS384 > RS512

     

       247
       -
       /// 5. Other algorithms - maintain original order

     

       248
       -
       ///

     

       249
       -
       /// Returns:

     

       250
       -
       /// - Negative if `a` is preferred over `b`

     

       251
       -
       /// - Positive if `b` is preferred over `a`

     

       252
       -
       /// - Zero if no preference (maintain order)

     

       253
       -
       int _compareAlgos(String a, String b) {

     

       254
       -
         // ES256K is always most preferred

     

       255
       -
         if (a == 'ES256K') return -1;

     

       256
       -
         if (b == 'ES256K') return 1;

     

       257
       -
       

     

       258
       -
         // Check algorithm families in preference order: ES > PS > RS

     

       259
       -
         for (final prefix in ['ES', 'PS', 'RS']) {

     

       260
       -
           if (a.startsWith(prefix)) {

     

       261
       -
             if (b.startsWith(prefix)) {

     

       262
       -
               // Both have same prefix, prefer shorter key length

     

       263
       -
               // Extract the number (e.g., "256" from "ES256")

     

       264
       -
               final aLen = int.tryParse(a.substring(2, 5)) ?? 0;

     

       265
       -
               final bLen = int.tryParse(b.substring(2, 5)) ?? 0;

     

       266
       -
       

     

       267
       -
               // Prefer shorter keys (256 < 384 < 512)

     

       268
       -
               return aLen - bLen;

     

       269
       -
             }

     

       270
       -
             // 'a' has the prefix, 'b' doesn't - prefer 'a'

     

       271
       -
             return -1;

     

       272
       -
           } else if (b.startsWith(prefix)) {

     

       273
       -
             // 'b' has the prefix, 'a' doesn't - prefer 'b'

     

       274
       -
             return 1;

     

       275
       -
           }

     

       276
       -
         }

     

       277
       -
       

     

       278
       -
         // No known preference, maintain original order

     

       279
       -
         return 0;

     

       280
       -
       }

-167

packages/atproto_oauth_flutter/lib/src/runtime/runtime_implementation.dart

···

       1
       -
       import 'dart:async';

     

       2
       -
       import 'dart:typed_data';

     

       3
       -
       

     

       4
       -
       /// Represents a cryptographic key that can sign and verify JWTs.

     

       5
       -
       ///

     

       6
       -
       /// This is a placeholder for the Key class from @atproto/jwk.

     

       7
       -
       /// In the full implementation, this should be imported from the jwk package.

     

       8
       -
       ///

     

       9
       -
       /// The Key class contains:

     

       10
       -
       /// - JWK representation (public and private)

     

       11
       -
       /// - Supported algorithms

     

       12
       -
       /// - createJwt() method for signing

     

       13
       -
       /// - verifyJwt() method for verification

     

       14
       -
       ///

     

       15
       -
       /// ## Key Serialization (IMPLEMENTED)

     

       16
       -
       ///

     

       17
       -
       /// DPoP keys are fully serialized and persisted in session storage via:

     

       18
       -
       ///

     

       19
       -
       /// 1. FlutterKey.toJson() / FlutterKey.privateJwk:

     

       20
       -
       ///    - Serializes the full JWK including private key components

     

       21
       -
       ///    - Used when storing sessions to secure storage

     

       22
       -
       ///

     

       23
       -
       /// 2. FlutterKey.fromJwk(Map<String, dynamic> jwk):

     

       24
       -
       ///    - Reconstructs a Key from serialized JWK

     

       25
       -
       ///    - Validates JWK structure and throws on corruption

     

       26
       -
       ///    - Used when restoring sessions from storage

     

       27
       -
       ///

     

       28
       -
       /// This ensures DPoP keys persist across app restarts, maintaining

     

       29
       -
       /// token binding consistency and avoiding unnecessary token refreshes.

     

       30
       -
       abstract class Key {

     

       31
       -
         /// Create a signed JWT with the given header and payload.

     

       32
       -
         Future<String> createJwt(

     

       33
       -
           Map<String, dynamic> header,

     

       34
       -
           Map<String, dynamic> payload,

     

       35
       -
         );

     

       36
       -
       

     

       37
       -
         /// The list of algorithms this key supports.

     

       38
       -
         List<String> get algorithms;

     

       39
       -
       

     

       40
       -
         /// The bare JWK (public key components only, for DPoP proofs).

     

       41
       -
         /// Returns null for symmetric keys.

     

       42
       -
         Map<String, dynamic>? get bareJwk;

     

       43
       -
       

     

       44
       -
         /// The key ID (kid) from the JWK.

     

       45
       -
         /// Returns null if the key doesn't have a kid.

     

       46
       -
         String? get kid;

     

       47
       -
       

     

       48
       -
         /// The usage of this key ('sign' or 'enc').

     

       49
       -
         String get usage;

     

       50
       -
       

     

       51
       -
         // TODO: Uncomment these when implementing serialization:

     

       52
       -
         // Map<String, dynamic> toJson();

     

       53
       -
         // static Key fromJson(Map<String, dynamic> json);

     

       54
       -
       }

     

       55
       -
       

     

       56
       -
       /// Factory function that creates a cryptographic key for the given algorithms.

     

       57
       -
       ///

     

       58
       -
       /// The key should support at least one of the provided algorithms.

     

       59
       -
       /// Algorithms are typically in order of preference.

     

       60
       -
       ///

     

       61
       -
       /// Common algorithms:

     

       62
       -
       /// - ES256, ES384, ES512 (Elliptic Curve)

     

       63
       -
       /// - ES256K (secp256k1)

     

       64
       -
       /// - RS256, RS384, RS512 (RSA)

     

       65
       -
       /// - PS256, PS384, PS512 (RSA-PSS)

     

       66
       -
       typedef RuntimeKeyFactory = FutureOr<Key> Function(List<String> algs);

     

       67
       -
       

     

       68
       -
       /// Generates cryptographically secure random bytes.

     

       69
       -
       ///

     

       70
       -
       /// Returns a Uint8List of the specified length filled with random bytes.

     

       71
       -
       /// Must use a cryptographically secure random number generator.

     

       72
       -
       typedef RuntimeRandomValues = FutureOr<Uint8List> Function(int length);

     

       73
       -
       

     

       74
       -
       /// Digest algorithm specification.

     

       75
       -
       class DigestAlgorithm {

     

       76
       -
         /// The hash algorithm name: 'sha256', 'sha384', or 'sha512'.

     

       77
       -
         final String name;

     

       78
       -
       

     

       79
       -
         const DigestAlgorithm({required this.name});

     

       80
       -
       

     

       81
       -
         const DigestAlgorithm.sha256() : name = 'sha256';

     

       82
       -
         const DigestAlgorithm.sha384() : name = 'sha384';

     

       83
       -
         const DigestAlgorithm.sha512() : name = 'sha512';

     

       84
       -
       }

     

       85
       -
       

     

       86
       -
       /// Computes a cryptographic hash (digest) of the input data.

     

       87
       -
       ///

     

       88
       -
       /// The algorithm specifies which hash function to use (SHA-256, SHA-384, SHA-512).

     

       89
       -
       /// Returns the hash as a Uint8List.

     

       90
       -
       typedef RuntimeDigest =

     

       91
       -
           FutureOr<Uint8List> Function(Uint8List data, DigestAlgorithm alg);

     

       92
       -
       

     

       93
       -
       /// Acquires a lock for the given name and executes the function while holding the lock.

     

       94
       -
       ///

     

       95
       -
       /// This ensures that only one execution of the function can run at a time for a given lock name.

     

       96
       -
       /// This is critical for preventing race conditions during token refresh operations.

     

       97
       -
       ///

     

       98
       -
       /// Example:

     

       99
       -
       /// ```dart

     

       100
       -
       /// final result = await requestLock('token-refresh', () async {

     

       101
       -
       ///   // Critical section - only one execution at a time

     

       102
       -
       ///   return await refreshToken();

     

       103
       -
       /// });

     

       104
       -
       /// ```

     

       105
       -
       typedef RuntimeLock =

     

       106
       -
           Future<T> Function<T>(String name, FutureOr<T> Function() fn);

     

       107
       -
       

     

       108
       -
       /// Platform-specific runtime implementation for cryptographic operations.

     

       109
       -
       ///

     

       110
       -
       /// This interface defines the core cryptographic primitives needed for OAuth:

     

       111
       -
       /// - Key generation (createKey)

     

       112
       -
       /// - Random number generation (getRandomValues)

     

       113
       -
       /// - Cryptographic hashing (digest)

     

       114
       -
       /// - Optional locking mechanism (requestLock)

     

       115
       -
       ///

     

       116
       -
       /// Implementations must use secure cryptographic libraries:

     

       117
       -
       /// - For Dart: pointycastle (ECDSA), crypto (SHA hashing)

     

       118
       -
       /// - Random values must come from dart:math.Random.secure()

     

       119
       -
       ///

     

       120
       -
       /// Security considerations:

     

       121
       -
       /// - Keys must be generated using cryptographically secure randomness

     

       122
       -
       /// - Private keys must never be logged or exposed

     

       123
       -
       /// - Hash functions must be collision-resistant (SHA-256 minimum)

     

       124
       -
       /// - Lock implementation should prevent race conditions in token refresh

     

       125
       -
       abstract class RuntimeImplementation {

     

       126
       -
         /// Creates a cryptographic key that supports at least one of the given algorithms.

     

       127
       -
         ///

     

       128
       -
         /// The algorithms list is typically sorted by preference, with the most preferred first.

     

       129
       -
         ///

     

       130
       -
         /// For OAuth DPoP, common algorithm preferences are:

     

       131
       -
         /// - ES256K (secp256k1) - preferred for atproto

     

       132
       -
         /// - ES256, ES384, ES512 (NIST curves)

     

       133
       -
         /// - PS256, PS384, PS512 (RSA-PSS)

     

       134
       -
         /// - RS256, RS384, RS512 (RSA-PKCS1)

     

       135
       -
         ///

     

       136
       -
         /// Throws if no suitable key can be generated for any of the algorithms.

     

       137
       -
         RuntimeKeyFactory get createKey;

     

       138
       -
       

     

       139
       -
         /// Generates cryptographically secure random bytes.

     

       140
       -
         ///

     

       141
       -
         /// MUST use a cryptographically secure random number generator.

     

       142
       -
         /// In Dart, use Random.secure() from dart:math.

     

       143
       -
         ///

     

       144
       -
         /// Never use a regular Random() - this is a security vulnerability.

     

       145
       -
         RuntimeRandomValues get getRandomValues;

     

       146
       -
       

     

       147
       -
         /// Computes a cryptographic hash of the input data.

     

       148
       -
         ///

     

       149
       -
         /// Supported algorithms: SHA-256, SHA-384, SHA-512

     

       150
       -
         ///

     

       151
       -
         /// Implementation should use the crypto package's sha256, sha384, sha512.

     

       152
       -
         RuntimeDigest get digest;

     

       153
       -
       

     

       154
       -
         /// Optional platform-specific lock implementation.

     

       155
       -
         ///

     

       156
       -
         /// If provided, this will be used to prevent concurrent token refresh operations.

     

       157
       -
         /// If not provided, a local (in-memory) lock implementation will be used as fallback.

     

       158
       -
         ///

     

       159
       -
         /// The lock should be:

     

       160
       -
         /// - Re-entrant safe (same isolate can acquire multiple times)

     

       161
       -
         /// - Fair (FIFO order)

     

       162
       -
         /// - Automatically released on error

     

       163
       -
         ///

     

       164
       -
         /// For Flutter apps, the default local lock is usually sufficient.

     

       165
       -
         /// For multi-process scenarios, you may need a platform-specific implementation.

     

       166
       -
         RuntimeLock? get requestLock;

     

       167
       -
       }

-395

packages/atproto_oauth_flutter/lib/src/session/oauth_session.dart

···

       1
       -
       import 'dart:async';

     

       2
       -
       import 'package:dio/dio.dart';

     

       3
       -
       import 'package:http/http.dart' as http;

     

       4
       -
       

     

       5
       -
       import '../dpop/fetch_dpop.dart';

     

       6
       -
       import '../errors/token_invalid_error.dart';

     

       7
       -
       import '../errors/token_revoked_error.dart';

     

       8
       -
       import '../oauth/oauth_server_agent.dart';

     

       9
       -
       

     

       10
       -
       /// Type alias for AtprotoDid (user's DID)

     

       11
       -
       typedef AtprotoDid = String;

     

       12
       -
       

     

       13
       -
       /// Type alias for AtprotoOAuthScope

     

       14
       -
       typedef AtprotoOAuthScope = String;

     

       15
       -
       

     

       16
       -
       /// Placeholder for OAuthAuthorizationServerMetadata

     

       17
       -
       /// Will be properly typed in later chunks

     

       18
       -
       typedef OAuthAuthorizationServerMetadata = Map<String, dynamic>;

     

       19
       -
       

     

       20
       -
       /// Information about the current token.

     

       21
       -
       class TokenInfo {

     

       22
       -
         /// When the token expires (null if no expiration)

     

       23
       -
         final DateTime? expiresAt;

     

       24
       -
       

     

       25
       -
         /// Whether the token is expired (null if no expiration)

     

       26
       -
         final bool? expired;

     

       27
       -
       

     

       28
       -
         /// The scope of access granted

     

       29
       -
         final AtprotoOAuthScope scope;

     

       30
       -
       

     

       31
       -
         /// The issuer URL

     

       32
       -
         final String iss;

     

       33
       -
       

     

       34
       -
         /// The audience (resource server)

     

       35
       -
         final String aud;

     

       36
       -
       

     

       37
       -
         /// The subject (user's DID)

     

       38
       -
         final AtprotoDid sub;

     

       39
       -
       

     

       40
       -
         TokenInfo({

     

       41
       -
           this.expiresAt,

     

       42
       -
           this.expired,

     

       43
       -
           required this.scope,

     

       44
       -
           required this.iss,

     

       45
       -
           required this.aud,

     

       46
       -
           required this.sub,

     

       47
       -
         });

     

       48
       -
       }

     

       49
       -
       

     

       50
       -
       /// Abstract interface for session management.

     

       51
       -
       ///

     

       52
       -
       /// This will be implemented by SessionGetter in session_getter.dart.

     

       53
       -
       /// We define it here to avoid circular dependencies.

     

       54
       -
       abstract class SessionGetterInterface {

     

       55
       -
         Future<Session> get(AtprotoDid sub, {bool? noCache, bool? allowStale});

     

       56
       -
       

     

       57
       -
         Future<void> delStored(AtprotoDid sub, [Object? cause]);

     

       58
       -
       }

     

       59
       -
       

     

       60
       -
       /// Represents an active OAuth session.

     

       61
       -
       ///

     

       62
       -
       /// A session is created after successful authentication and provides methods

     

       63
       -
       /// for making authenticated requests and managing the session lifecycle.

     

       64
       -
       class Session {

     

       65
       -
         /// The DPoP key used for this session (serialized as Map for storage)

     

       66
       -
         final Map<String, dynamic> dpopKey;

     

       67
       -
       

     

       68
       -
         /// The client authentication method (serialized as Map or String for storage).

     

       69
       -
         /// Can be:

     

       70
       -
         /// - A Map containing {method: 'private_key_jwt', kid: '...'} for private key JWT

     

       71
       -
         /// - A Map containing {method: 'none'} for no authentication

     

       72
       -
         /// - A String 'legacy' for backwards compatibility

     

       73
       -
         /// - null (defaults to 'legacy' when loading)

     

       74
       -
         final dynamic authMethod;

     

       75
       -
       

     

       76
       -
         /// The token set containing access and refresh tokens

     

       77
       -
         final TokenSet tokenSet;

     

       78
       -
       

     

       79
       -
         const Session({

     

       80
       -
           required this.dpopKey,

     

       81
       -
           this.authMethod,

     

       82
       -
           required this.tokenSet,

     

       83
       -
         });

     

       84
       -
       

     

       85
       -
         /// Creates a Session from JSON.

     

       86
       -
         factory Session.fromJson(Map<String, dynamic> json) {

     

       87
       -
           return Session(

     

       88
       -
             dpopKey: json['dpopKey'] as Map<String, dynamic>,

     

       89
       -
             authMethod: json['authMethod'], // Can be Map or String

     

       90
       -
             tokenSet: TokenSet.fromJson(json['tokenSet'] as Map<String, dynamic>),

     

       91
       -
           );

     

       92
       -
         }

     

       93
       -
       

     

       94
       -
         /// Converts this Session to JSON.

     

       95
       -
         Map<String, dynamic> toJson() {

     

       96
       -
           final json = <String, dynamic>{

     

       97
       -
             'dpopKey': dpopKey,

     

       98
       -
             'tokenSet': tokenSet.toJson(),

     

       99
       -
           };

     

       100
       -
       

     

       101
       -
           if (authMethod != null) json['authMethod'] = authMethod;

     

       102
       -
       

     

       103
       -
           return json;

     

       104
       -
         }

     

       105
       -
       }

     

       106
       -
       

     

       107
       -
       /// Represents an active OAuth session with methods for authenticated requests.

     

       108
       -
       ///

     

       109
       -
       /// This class wraps an OAuth session and provides:

     

       110
       -
       /// - Automatic token refresh on expiry

     

       111
       -
       /// - DPoP-protected requests

     

       112
       -
       /// - Session lifecycle management (sign out)

     

       113
       -
       ///

     

       114
       -
       /// Example:

     

       115
       -
       /// ```dart

     

       116
       -
       /// final session = OAuthSession(

     

       117
       -
       ///   server: oauthServer,

     

       118
       -
       ///   sub: 'did:plc:abc123',

     

       119
       -
       ///   sessionGetter: sessionGetter,

     

       120
       -
       /// );

     

       121
       -
       ///

     

       122
       -
       /// // Make an authenticated request

     

       123
       -
       /// final response = await session.fetchHandler('/api/posts');

     

       124
       -
       ///

     

       125
       -
       /// // Get token information

     

       126
       -
       /// final info = await session.getTokenInfo();

     

       127
       -
       /// print('Token expires at: ${info.expiresAt}');

     

       128
       -
       ///

     

       129
       -
       /// // Sign out

     

       130
       -
       /// await session.signOut();

     

       131
       -
       /// ```

     

       132
       -
       class OAuthSession {

     

       133
       -
         /// The OAuth server agent

     

       134
       -
         final OAuthServerAgent server;

     

       135
       -
       

     

       136
       -
         /// The subject (user's DID)

     

       137
       -
         final AtprotoDid sub;

     

       138
       -
       

     

       139
       -
         /// The session getter for retrieving and refreshing tokens

     

       140
       -
         final SessionGetterInterface sessionGetter;

     

       141
       -
       

     

       142
       -
         /// Dio instance with DPoP interceptor for authenticated requests

     

       143
       -
         final Dio _dio;

     

       144
       -
       

     

       145
       -
         /// Creates a new OAuth session.

     

       146
       -
         ///

     

       147
       -
         /// Parameters:

     

       148
       -
         /// - [server]: The OAuth server agent

     

       149
       -
         /// - [sub]: The subject (user's DID)

     

       150
       -
         /// - [sessionGetter]: The session getter for token management

     

       151
       -
         OAuthSession({

     

       152
       -
           required this.server,

     

       153
       -
           required this.sub,

     

       154
       -
           required this.sessionGetter,

     

       155
       -
         }) : _dio = Dio() {

     

       156
       -
           // Add DPoP interceptor for authenticated requests to resource servers

     

       157
       -
           _dio.interceptors.add(

     

       158
       -
             createDpopInterceptor(

     

       159
       -
               DpopFetchWrapperOptions(

     

       160
       -
                 key: server.dpopKey,

     

       161
       -
                 nonces: server.dpopNonces,

     

       162
       -
                 sha256: server.runtime.sha256,

     

       163
       -
                 isAuthServer: false, // Resource server requests (PDS)

     

       164
       -
               ),

     

       165
       -
             ),

     

       166
       -
           );

     

       167
       -
         }

     

       168
       -
       

     

       169
       -
         /// Alias for [sub]

     

       170
       -
         AtprotoDid get did => sub;

     

       171
       -
       

     

       172
       -
         /// The server metadata

     

       173
       -
         OAuthAuthorizationServerMetadata get serverMetadata => server.serverMetadata;

     

       174
       -
       

     

       175
       -
         /// Gets the current token set.

     

       176
       -
         ///

     

       177
       -
         /// Parameters:

     

       178
       -
         /// - [refresh]: When `true`, forces a token refresh even if not expired.

     

       179
       -
         ///   When `false`, uses cached tokens even if expired.

     

       180
       -
         ///   When `'auto'`, refreshes only if expired (default).

     

       181
       -
         Future<TokenSet> _getTokenSet(dynamic refresh) async {

     

       182
       -
           final session = await sessionGetter.get(

     

       183
       -
             sub,

     

       184
       -
             noCache: refresh == true,

     

       185
       -
             allowStale: refresh == false,

     

       186
       -
           );

     

       187
       -
       

     

       188
       -
           return session.tokenSet;

     

       189
       -
         }

     

       190
       -
       

     

       191
       -
         /// Gets information about the current token.

     

       192
       -
         ///

     

       193
       -
         /// Parameters:

     

       194
       -
         /// - [refresh]: When `true`, forces a token refresh even if not expired.

     

       195
       -
         ///   When `false`, uses cached tokens even if expired.

     

       196
       -
         ///   When `'auto'`, refreshes only if expired (default).

     

       197
       -
         Future<TokenInfo> getTokenInfo([dynamic refresh = 'auto']) async {

     

       198
       -
           final tokenSet = await _getTokenSet(refresh);

     

       199
       -
           final expiresAtStr = tokenSet.expiresAt;

     

       200
       -
           final expiresAt =

     

       201
       -
               expiresAtStr != null ? DateTime.parse(expiresAtStr) : null;

     

       202
       -
       

     

       203
       -
           return TokenInfo(

     

       204
       -
             expiresAt: expiresAt,

     

       205
       -
             expired:

     

       206
       -
                 expiresAt != null

     

       207
       -
                     ? expiresAt.isBefore(

     

       208
       -
                       DateTime.now().subtract(Duration(seconds: 5)),

     

       209
       -
                     )

     

       210
       -
                     : null,

     

       211
       -
             scope: tokenSet.scope,

     

       212
       -
             iss: tokenSet.iss,

     

       213
       -
             aud: tokenSet.aud,

     

       214
       -
             sub: tokenSet.sub,

     

       215
       -
           );

     

       216
       -
         }

     

       217
       -
       

     

       218
       -
         /// Signs out the user.

     

       219
       -
         ///

     

       220
       -
         /// This revokes the access token and deletes the session from storage.

     

       221
       -
         /// Even if revocation fails, the session is removed locally.

     

       222
       -
         Future<void> signOut() async {

     

       223
       -
           try {

     

       224
       -
             final tokenSet = await _getTokenSet(false);

     

       225
       -
             await server.revoke(tokenSet.accessToken);

     

       226
       -
           } finally {

     

       227
       -
             await sessionGetter.delStored(sub, TokenRevokedError(sub));

     

       228
       -
           }

     

       229
       -
         }

     

       230
       -
       

     

       231
       -
         /// Makes an authenticated HTTP request to the given pathname.

     

       232
       -
         ///

     

       233
       -
         /// This method:

     

       234
       -
         /// 1. Automatically refreshes tokens if they're expired

     

       235
       -
         /// 2. Adds DPoP and Authorization headers

     

       236
       -
         /// 3. Retries once with a fresh token if the initial request fails with 401

     

       237
       -
         ///

     

       238
       -
         /// Parameters:

     

       239
       -
         /// - [pathname]: The pathname to request (relative to the audience URL)

     

       240
       -
         /// - [method]: HTTP method (default: 'GET')

     

       241
       -
         /// - [headers]: Additional headers to include

     

       242
       -
         /// - [body]: Request body

     

       243
       -
         ///

     

       244
       -
         /// Returns the HTTP response.

     

       245
       -
         ///

     

       246
       -
         /// Example:

     

       247
       -
         /// ```dart

     

       248
       -
         /// final response = await session.fetchHandler(

     

       249
       -
         ///   '/xrpc/com.atproto.repo.createRecord',

     

       250
       -
         ///   method: 'POST',

     

       251
       -
         ///   headers: {'Content-Type': 'application/json'},

     

       252
       -
         ///   body: jsonEncode({'repo': did, 'collection': 'app.bsky.feed.post', ...}),

     

       253
       -
         /// );

     

       254
       -
         /// ```

     

       255
       -
         Future<http.Response> fetchHandler(

     

       256
       -
           String pathname, {

     

       257
       -
           String method = 'GET',

     

       258
       -
           Map<String, String>? headers,

     

       259
       -
           dynamic body,

     

       260
       -
         }) async {

     

       261
       -
           // Try to refresh the token if it's known to be expired

     

       262
       -
           final tokenSet = await _getTokenSet('auto');

     

       263
       -
       

     

       264
       -
           final initialUrl = Uri.parse(tokenSet.aud).resolve(pathname);

     

       265
       -
           final initialAuth = '${tokenSet.tokenType} ${tokenSet.accessToken}';

     

       266
       -
       

     

       267
       -
           final initialHeaders = <String, String>{

     

       268
       -
             ...?headers,

     

       269
       -
             'Authorization': initialAuth,

     

       270
       -
           };

     

       271
       -
       

     

       272
       -
           // Make request with DPoP - the interceptor will automatically add DPoP header

     

       273
       -
           final initialResponse = await _makeDpopRequest(

     

       274
       -
             initialUrl,

     

       275
       -
             method: method,

     

       276
       -
             headers: initialHeaders,

     

       277
       -
             body: body,

     

       278
       -
           );

     

       279
       -
       

     

       280
       -
           // If the token is not expired, we don't need to refresh it

     

       281
       -
           if (!_isInvalidTokenResponse(initialResponse)) {

     

       282
       -
             return initialResponse;

     

       283
       -
           }

     

       284
       -
       

     

       285
       -
           // Token is invalid, try to refresh

     

       286
       -
           TokenSet tokenSetFresh;

     

       287
       -
           try {

     

       288
       -
             // Force a refresh

     

       289
       -
             tokenSetFresh = await _getTokenSet(true);

     

       290
       -
           } catch (err) {

     

       291
       -
             // If refresh fails, return the original response

     

       292
       -
             return initialResponse;

     

       293
       -
           }

     

       294
       -
       

     

       295
       -
           // Retry with fresh token

     

       296
       -
           final finalAuth = '${tokenSetFresh.tokenType} ${tokenSetFresh.accessToken}';

     

       297
       -
           final finalUrl = Uri.parse(tokenSetFresh.aud).resolve(pathname);

     

       298
       -
       

     

       299
       -
           final finalHeaders = <String, String>{

     

       300
       -
             ...?headers,

     

       301
       -
             'Authorization': finalAuth,

     

       302
       -
           };

     

       303
       -
       

     

       304
       -
           final finalResponse = await _makeDpopRequest(

     

       305
       -
             finalUrl,

     

       306
       -
             method: method,

     

       307
       -
             headers: finalHeaders,

     

       308
       -
             body: body,

     

       309
       -
           );

     

       310
       -
       

     

       311
       -
           // The token was successfully refreshed, but is still not accepted by the

     

       312
       -
           // resource server. This might be due to the resource server not accepting

     

       313
       -
           // credentials from the authorization server (e.g. because some migration

     

       314
       -
           // occurred). Any ways, there is no point in keeping the session.

     

       315
       -
           if (_isInvalidTokenResponse(finalResponse)) {

     

       316
       -
             await sessionGetter.delStored(sub, TokenInvalidError(sub));

     

       317
       -
           }

     

       318
       -
       

     

       319
       -
           return finalResponse;

     

       320
       -
         }

     

       321
       -
       

     

       322
       -
         /// Makes an HTTP request with DPoP authentication.

     

       323
       -
         ///

     

       324
       -
         /// Uses Dio with DPoP interceptor which automatically adds:

     

       325
       -
         /// - DPoP header with proof JWT

     

       326
       -
         /// - Access token hash (ath) binding

     

       327
       -
         ///

     

       328
       -
         /// Throws [DioException] for network errors, timeouts, and cancellations.

     

       329
       -
         Future<http.Response> _makeDpopRequest(

     

       330
       -
           Uri url, {

     

       331
       -
           required String method,

     

       332
       -
           Map<String, String>? headers,

     

       333
       -
           dynamic body,

     

       334
       -
         }) async {

     

       335
       -
           try {

     

       336
       -
             // Make request with Dio - interceptor will add DPoP header

     

       337
       -
             final response = await _dio.requestUri(

     

       338
       -
               url,

     

       339
       -
               options: Options(

     

       340
       -
                 method: method,

     

       341
       -
                 headers: headers,

     

       342
       -
                 responseType: ResponseType.bytes, // Get raw bytes for compatibility

     

       343
       -
                 validateStatus: (status) => true, // Don't throw on any status code

     

       344
       -
               ),

     

       345
       -
               data: body,

     

       346
       -
             );

     

       347
       -
       

     

       348
       -
             // Convert Dio Response to http.Response for compatibility

     

       349
       -
             return http.Response.bytes(

     

       350
       -
               response.data as List<int>,

     

       351
       -
               response.statusCode!,

     

       352
       -
               headers: response.headers.map.map(

     

       353
       -
                 (key, value) => MapEntry(key, value.join(', ')),

     

       354
       -
               ),

     

       355
       -
               reasonPhrase: response.statusMessage,

     

       356
       -
             );

     

       357
       -
           } on DioException catch (e) {

     

       358
       -
             // If we have a response (4xx/5xx), convert it to http.Response

     

       359
       -
             if (e.response != null) {

     

       360
       -
               final errorResponse = e.response!;

     

       361
       -
               return http.Response.bytes(

     

       362
       -
                 errorResponse.data is List<int>

     

       363
       -
                     ? errorResponse.data as List<int>

     

       364
       -
                     : (errorResponse.data?.toString() ?? '').codeUnits,

     

       365
       -
                 errorResponse.statusCode!,

     

       366
       -
                 headers: errorResponse.headers.map.map(

     

       367
       -
                   (key, value) => MapEntry(key, value.join(', ')),

     

       368
       -
                 ),

     

       369
       -
                 reasonPhrase: errorResponse.statusMessage,

     

       370
       -
               );

     

       371
       -
             }

     

       372
       -
             // Network errors, timeouts, cancellations - rethrow

     

       373
       -
             rethrow;

     

       374
       -
           }

     

       375
       -
         }

     

       376
       -
       

     

       377
       -
         /// Checks if a response indicates an invalid token.

     

       378
       -
         ///

     

       379
       -
         /// See:

     

       380
       -
         /// - https://datatracker.ietf.org/doc/html/rfc6750#section-3

     

       381
       -
         /// - https://datatracker.ietf.org/doc/html/rfc9449#name-resource-server-provided-no

     

       382
       -
         bool _isInvalidTokenResponse(http.Response response) {

     

       383
       -
           if (response.statusCode != 401) return false;

     

       384
       -
       

     

       385
       -
           final wwwAuth = response.headers['www-authenticate'];

     

       386
       -
           return wwwAuth != null &&

     

       387
       -
               (wwwAuth.startsWith('Bearer ') || wwwAuth.startsWith('DPoP ')) &&

     

       388
       -
               wwwAuth.contains('error="invalid_token"');

     

       389
       -
         }

     

       390
       -
       

     

       391
       -
         /// Disposes of resources used by this session.

     

       392
       -
         void dispose() {

     

       393
       -
           _dio.close();

     

       394
       -
         }

     

       395
       -
       }

-42

packages/atproto_oauth_flutter/lib/src/session/session.dart

···

       1
       -
       /// Session management layer for atproto OAuth.

     

       2
       -
       ///

     

       3
       -
       /// This module provides session storage, retrieval, and lifecycle management

     

       4
       -
       /// for OAuth sessions. It includes:

     

       5
       -
       ///

     

       6
       -
       /// - [StateStore] - Stores ephemeral OAuth state during authorization

     

       7
       -
       /// - [SessionStore] - Stores persistent session data

     

       8
       -
       /// - [Session] - Represents an authenticated session with tokens

     

       9
       -
       /// - [TokenSet] - Contains OAuth tokens and metadata

     

       10
       -
       /// - [OAuthSession] - High-level API for authenticated requests

     

       11
       -
       /// - [SessionGetter] - Manages session caching and token refresh

     

       12
       -
       ///

     

       13
       -
       /// Example:

     

       14
       -
       /// ```dart

     

       15
       -
       /// // Create a session store implementation

     

       16
       -
       /// final sessionStore = MySessionStore();

     

       17
       -
       ///

     

       18
       -
       /// // Create a session getter

     

       19
       -
       /// final sessionGetter = SessionGetter(

     

       20
       -
       ///   sessionStore: sessionStore,

     

       21
       -
       ///   serverFactory: serverFactory,

     

       22
       -
       ///   runtime: runtime,

     

       23
       -
       /// );

     

       24
       -
       ///

     

       25
       -
       /// // Get a session (automatically refreshes if needed)

     

       26
       -
       /// final session = await sessionGetter.getSession('did:plc:abc123');

     

       27
       -
       ///

     

       28
       -
       /// // Create an OAuthSession for making requests

     

       29
       -
       /// final oauthSession = OAuthSession(

     

       30
       -
       ///   server: server,

     

       31
       -
       ///   sub: 'did:plc:abc123',

     

       32
       -
       ///   sessionGetter: sessionGetter,

     

       33
       -
       /// );

     

       34
       -
       ///

     

       35
       -
       /// // Make authenticated requests

     

       36
       -
       /// final response = await oauthSession.fetchHandler('/api/posts');

     

       37
       -
       /// ```

     

       38
       -
       library;

     

       39
       -
       

     

       40
       -
       export 'state_store.dart';

     

       41
       -
       export 'oauth_session.dart';

     

       42
       -
       export 'session_getter.dart';

-644

packages/atproto_oauth_flutter/lib/src/session/session_getter.dart

···

       1
       -
       import 'dart:async';

     

       2
       -
       import 'dart:convert';

     

       3
       -
       import 'dart:math' as math;

     

       4
       -
       

     

       5
       -
       import '../errors/auth_method_unsatisfiable_error.dart';

     

       6
       -
       import '../errors/token_invalid_error.dart';

     

       7
       -
       import '../errors/token_refresh_error.dart';

     

       8
       -
       import '../errors/token_revoked_error.dart';

     

       9
       -
       import '../oauth/client_auth.dart' show ClientAuthMethod;

     

       10
       -
       import '../oauth/oauth_server_agent.dart';

     

       11
       -
       import '../oauth/oauth_server_factory.dart';

     

       12
       -
       import '../platform/flutter_key.dart';

     

       13
       -
       import '../runtime/runtime.dart';

     

       14
       -
       import '../util.dart';

     

       15
       -
       import 'oauth_session.dart';

     

       16
       -
       

     

       17
       -
       /// Options for getting a cached value.

     

       18
       -
       class GetCachedOptions {

     

       19
       -
         /// Cancellation token for aborting the operation

     

       20
       -
         final CancellationToken? signal;

     

       21
       -
       

     

       22
       -
         /// Do not use the cache to get the value. Always get a new value.

     

       23
       -
         final bool? noCache;

     

       24
       -
       

     

       25
       -
         /// Allow returning stale values from the cache.

     

       26
       -
         final bool? allowStale;

     

       27
       -
       

     

       28
       -
         const GetCachedOptions({this.signal, this.noCache, this.allowStale});

     

       29
       -
       }

     

       30
       -
       

     

       31
       -
       /// Abstract storage interface for values.

     

       32
       -
       ///

     

       33
       -
       /// This is a generic key-value store interface.

     

       34
       -
       abstract class SimpleStore<K, V> {

     

       35
       -
         /// Gets a value from the store.

     

       36
       -
         ///

     

       37
       -
         /// Returns `null` if the key doesn't exist.

     

       38
       -
         Future<V?> get(K key, {CancellationToken? signal});

     

       39
       -
       

     

       40
       -
         /// Sets a value in the store.

     

       41
       -
         Future<void> set(K key, V value);

     

       42
       -
       

     

       43
       -
         /// Deletes a value from the store.

     

       44
       -
         Future<void> del(K key);

     

       45
       -
       

     

       46
       -
         /// Optionally clears all values from the store.

     

       47
       -
         Future<void> clear() async {}

     

       48
       -
       }

     

       49
       -
       

     

       50
       -
       /// Type alias for session storage

     

       51
       -
       typedef SessionStore = SimpleStore<String, Session>;

     

       52
       -
       

     

       53
       -
       /// Details of a session update event.

     

       54
       -
       class SessionUpdatedEvent {

     

       55
       -
         /// The subject (user's DID)

     

       56
       -
         final String sub;

     

       57
       -
       

     

       58
       -
         /// The DPoP key

     

       59
       -
         final Map<String, dynamic> dpopKey;

     

       60
       -
       

     

       61
       -
         /// The authentication method

     

       62
       -
         final String? authMethod;

     

       63
       -
       

     

       64
       -
         /// The token set

     

       65
       -
         final TokenSet tokenSet;

     

       66
       -
       

     

       67
       -
         const SessionUpdatedEvent({

     

       68
       -
           required this.sub,

     

       69
       -
           required this.dpopKey,

     

       70
       -
           this.authMethod,

     

       71
       -
           required this.tokenSet,

     

       72
       -
         });

     

       73
       -
       }

     

       74
       -
       

     

       75
       -
       /// Details of a session deletion event.

     

       76
       -
       class SessionDeletedEvent {

     

       77
       -
         /// The subject (user's DID)

     

       78
       -
         final String sub;

     

       79
       -
       

     

       80
       -
         /// The cause of deletion

     

       81
       -
         final Object cause;

     

       82
       -
       

     

       83
       -
         const SessionDeletedEvent({required this.sub, required this.cause});

     

       84
       -
       }

     

       85
       -
       

     

       86
       -
       /// Manages session retrieval, caching, and refreshing.

     

       87
       -
       ///

     

       88
       -
       /// The SessionGetter wraps a session store and provides:

     

       89
       -
       /// - Automatic token refresh when tokens are stale/expired

     

       90
       -
       /// - Caching to avoid redundant refresh operations

     

       91
       -
       /// - Events for session updates and deletions

     

       92
       -
       /// - Concurrency control to prevent multiple simultaneous refreshes

     

       93
       -
       ///

     

       94
       -
       /// This is a critical component that ensures at most one token refresh

     

       95
       -
       /// is happening at a time for a given user, even across multiple tabs

     

       96
       -
       /// or app instances.

     

       97
       -
       ///

     

       98
       -
       /// Example:

     

       99
       -
       /// ```dart

     

       100
       -
       /// final sessionGetter = SessionGetter(

     

       101
       -
       ///   sessionStore: mySessionStore,

     

       102
       -
       ///   serverFactory: myServerFactory,

     

       103
       -
       ///   runtime: myRuntime,

     

       104
       -
       /// );

     

       105
       -
       ///

     

       106
       -
       /// // Listen for session updates

     

       107
       -
       /// sessionGetter.onUpdated.listen((event) {

     

       108
       -
       ///   print('Session updated for ${event.sub}');

     

       109
       -
       /// });

     

       110
       -
       ///

     

       111
       -
       /// // Listen for session deletions

     

       112
       -
       /// sessionGetter.onDeleted.listen((event) {

     

       113
       -
       ///   print('Session deleted for ${event.sub}: ${event.cause}');

     

       114
       -
       /// });

     

       115
       -
       ///

     

       116
       -
       /// // Get a session (automatically refreshes if expired)

     

       117
       -
       /// final session = await sessionGetter.getSession('did:plc:abc123');

     

       118
       -
       ///

     

       119
       -
       /// // Force refresh

     

       120
       -
       /// final freshSession = await sessionGetter.getSession('did:plc:abc123', true);

     

       121
       -
       /// ```

     

       122
       -
       class SessionGetter extends CachedGetter<AtprotoDid, Session> {

     

       123
       -
         final OAuthServerFactory _serverFactory;

     

       124
       -
         final Runtime _runtime;

     

       125
       -
       

     

       126
       -
         final _eventTarget = CustomEventTarget<Map<String, dynamic>>();

     

       127
       -
         final _updatedController = StreamController<SessionUpdatedEvent>.broadcast();

     

       128
       -
         final _deletedController = StreamController<SessionDeletedEvent>.broadcast();

     

       129
       -
       

     

       130
       -
         /// Stream of session update events.

     

       131
       -
         Stream<SessionUpdatedEvent> get onUpdated => _updatedController.stream;

     

       132
       -
       

     

       133
       -
         /// Stream of session deletion events.

     

       134
       -
         Stream<SessionDeletedEvent> get onDeleted => _deletedController.stream;

     

       135
       -
       

     

       136
       -
         SessionGetter({

     

       137
       -
           required super.sessionStore,

     

       138
       -
           required OAuthServerFactory serverFactory,

     

       139
       -
           required Runtime runtime,

     

       140
       -
         }) : _serverFactory = serverFactory,

     

       141
       -
              _runtime = runtime,

     

       142
       -
              super(

     

       143
       -
                getter: null, // Will be set in _createGetter

     

       144
       -
                options: CachedGetterOptions(

     

       145
       -
                  isStale: (sub, session) {

     

       146
       -
                    final tokenSet = session.tokenSet;

     

       147
       -
                    if (tokenSet.expiresAt == null) return false;

     

       148
       -
       

     

       149
       -
                    final expiresAt = DateTime.parse(tokenSet.expiresAt!);

     

       150
       -
                    final now = DateTime.now();

     

       151
       -
       

     

       152
       -
                    // Add some lee way to ensure the token is not expired when it

     

       153
       -
                    // reaches the server (10 seconds)

     

       154
       -
                    // Add some randomness to reduce the chances of multiple

     

       155
       -
                    // instances trying to refresh the token at the same time (0-30 seconds)

     

       156
       -
                    final buffer = Duration(

     

       157
       -
                      milliseconds:

     

       158
       -
                          10000 + (math.Random().nextDouble() * 30000).toInt(),

     

       159
       -
                    );

     

       160
       -
       

     

       161
       -
                    return expiresAt.isBefore(now.add(buffer));

     

       162
       -
                  },

     

       163
       -
                  onStoreError: (err, sub, session) async {

     

       164
       -
                    if (err is! AuthMethodUnsatisfiableError) {

     

       165
       -
                      // If the error was an AuthMethodUnsatisfiableError, there is no

     

       166
       -
                      // point in trying to call `fromIssuer`.

     

       167
       -
                      try {

     

       168
       -
                        // Parse authMethod

     

       169
       -
                        final authMethodValue = session.authMethod;

     

       170
       -
                        final authMethod =

     

       171
       -
                            authMethodValue is Map<String, dynamic>

     

       172
       -
                                ? ClientAuthMethod.fromJson(authMethodValue)

     

       173
       -
                                : (authMethodValue as String?) ?? 'legacy';

     

       174
       -
       

     

       175
       -
                        // Restore DPoP key from session for revocation

     

       176
       -
                        // CRITICAL FIX: Use the stored key instead of generating a new one

     

       177
       -
                        // This ensures DPoP proofs match the token binding

     

       178
       -
                        final dpopKey = FlutterKey.fromJwk(

     

       179
       -
                          session.dpopKey as Map<String, dynamic>,

     

       180
       -
                        );

     

       181
       -
       

     

       182
       -
                        // If the token data cannot be stored, let's revoke it

     

       183
       -
                        final server = await serverFactory.fromIssuer(

     

       184
       -
                          session.tokenSet.iss,

     

       185
       -
                          authMethod,

     

       186
       -
                          dpopKey,

     

       187
       -
                        );

     

       188
       -
                        await server.revoke(

     

       189
       -
                          session.tokenSet.refreshToken ??

     

       190
       -
                              session.tokenSet.accessToken,

     

       191
       -
                        );

     

       192
       -
                      } catch (_) {

     

       193
       -
                        // Let the original error propagate

     

       194
       -
                      }

     

       195
       -
                    }

     

       196
       -
       

     

       197
       -
                    throw err;

     

       198
       -
                  },

     

       199
       -
                  deleteOnError: (err) async {

     

       200
       -
                    return err is TokenRefreshError ||

     

       201
       -
                        err is TokenRevokedError ||

     

       202
       -
                        err is TokenInvalidError ||

     

       203
       -
                        err is AuthMethodUnsatisfiableError;

     

       204
       -
                  },

     

       205
       -
                ),

     

       206
       -
              ) {

     

       207
       -
           // Set the getter function after construction

     

       208
       -
           _getter = _createGetter();

     

       209
       -
         }

     

       210
       -
       

     

       211
       -
         /// Creates the getter function for refreshing sessions.

     

       212
       -
         Future<Session> Function(AtprotoDid, GetCachedOptions, Session?)

     

       213
       -
         _createGetter() {

     

       214
       -
           return (sub, options, storedSession) async {

     

       215
       -
             // There needs to be a previous session to be able to refresh. If

     

       216
       -
             // storedSession is null, it means that the store does not contain

     

       217
       -
             // a session for the given sub.

     

       218
       -
             if (storedSession == null) {

     

       219
       -
               // Because the session is not in the store, delStored() method

     

       220
       -
               // will not be called by the CachedGetter class (because there is

     

       221
       -
               // nothing to delete). This would typically happen if there is no

     

       222
       -
               // synchronization mechanism between instances of this class. Let's

     

       223
       -
               // make sure an event is dispatched here if this occurs.

     

       224
       -
               const msg = 'The session was deleted by another process';

     

       225
       -
               final cause = TokenRefreshError(sub, msg);

     

       226
       -
               _dispatchDeletedEvent(sub, cause);

     

       227
       -
               throw cause;

     

       228
       -
             }

     

       229
       -
       

     

       230
       -
             // From this point forward, throwing a TokenRefreshError will result in

     

       231
       -
             // delStored() being called, resulting in an event being dispatched,

     

       232
       -
             // even if the session was removed from the store through a concurrent

     

       233
       -
             // access (which, normally, should not happen if a proper runtime lock

     

       234
       -
             // was provided).

     

       235
       -
       

     

       236
       -
             // authMethod can be a Map (serialized ClientAuthMethod) or String ('legacy')

     

       237
       -
             final authMethodValue = storedSession.authMethod;

     

       238
       -
             final authMethod =

     

       239
       -
                 authMethodValue is Map<String, dynamic>

     

       240
       -
                     ? ClientAuthMethod.fromJson(authMethodValue)

     

       241
       -
                     : (authMethodValue as String?) ?? 'legacy';

     

       242
       -
             final tokenSet = storedSession.tokenSet;

     

       243
       -
       

     

       244
       -
             if (sub != tokenSet.sub) {

     

       245
       -
               // Fool-proofing (e.g. against invalid session storage)

     

       246
       -
               throw TokenRefreshError(sub, 'Stored session sub mismatch');

     

       247
       -
             }

     

       248
       -
       

     

       249
       -
             if (tokenSet.refreshToken == null) {

     

       250
       -
               throw TokenRefreshError(sub, 'No refresh token available');

     

       251
       -
             }

     

       252
       -
       

     

       253
       -
             // Since refresh tokens can only be used once, we might run into

     

       254
       -
             // concurrency issues if multiple instances (e.g. browser tabs) are

     

       255
       -
             // trying to refresh the same token simultaneously. The chances of this

     

       256
       -
             // happening when multiple instances are started simultaneously is

     

       257
       -
             // reduced by randomizing the expiry time (see isStale above). The

     

       258
       -
             // best solution is to use a mutex/lock to ensure that only one instance

     

       259
       -
             // is refreshing the token at a time (runtime.usingLock) but that is not

     

       260
       -
             // always possible. If no lock implementation is provided, we will use

     

       261
       -
             // the store to check if a concurrent refresh occurred.

     

       262
       -
       

     

       263
       -
             // Restore dpopKey from stored private JWK with error handling

     

       264
       -
             // CRITICAL FIX: Use the stored key instead of generating a new one

     

       265
       -
             // This ensures DPoP proofs match the token binding during refresh

     

       266
       -
             final FlutterKey dpopKey;

     

       267
       -
             try {

     

       268
       -
               dpopKey = FlutterKey.fromJwk(

     

       269
       -
                 storedSession.dpopKey as Map<String, dynamic>,

     

       270
       -
               );

     

       271
       -
             } catch (e) {

     

       272
       -
               // If key is corrupted, the session is unusable - force re-authentication

     

       273
       -
               throw TokenRefreshError(

     

       274
       -
                 sub,

     

       275
       -
                 'Corrupted DPoP key in stored session: $e. Re-authentication required.',

     

       276
       -
               );

     

       277
       -
             }

     

       278
       -
       

     

       279
       -
             final server = await _serverFactory.fromIssuer(

     

       280
       -
               tokenSet.iss,

     

       281
       -
               authMethod,

     

       282
       -
               dpopKey,

     

       283
       -
             );

     

       284
       -
       

     

       285
       -
             // Because refresh tokens can only be used once, we must not use the

     

       286
       -
             // "signal" to abort the refresh, or throw any abort error beyond this

     

       287
       -
             // point. Any thrown error beyond this point will prevent the

     

       288
       -
             // SessionGetter from obtaining, and storing, the new token set,

     

       289
       -
             // effectively rendering the currently saved session unusable.

     

       290
       -
             options.signal?.throwIfCancelled();

     

       291
       -
       

     

       292
       -
             try {

     

       293
       -
               final newTokenSet = await server.refresh(tokenSet);

     

       294
       -
       

     

       295
       -
               if (sub != newTokenSet.sub) {

     

       296
       -
                 // The server returned another sub. Was the tokenSet manipulated?

     

       297
       -
                 throw TokenRefreshError(sub, 'Token set sub mismatch');

     

       298
       -
               }

     

       299
       -
       

     

       300
       -
               // CRITICAL FIX: Preserve the stored DPoP key (full private JWK)

     

       301
       -
               // This ensures the same key is used across token refreshes

     

       302
       -
               return Session(

     

       303
       -
                 dpopKey: storedSession.dpopKey,

     

       304
       -
                 tokenSet: newTokenSet,

     

       305
       -
                 authMethod: server.authMethod.toJson(),

     

       306
       -
               );

     

       307
       -
             } catch (cause) {

     

       308
       -
               // If the refresh token is invalid, let's try to recover from

     

       309
       -
               // concurrency issues, or make sure the session is deleted by throwing

     

       310
       -
               // a TokenRefreshError.

     

       311
       -
               if (cause is OAuthResponseError &&

     

       312
       -
                   cause.status == 400 &&

     

       313
       -
                   cause.error == 'invalid_grant') {

     

       314
       -
                 // In case there is no lock implementation in the runtime, we will

     

       315
       -
                 // wait for a short time to give the other concurrent instances a

     

       316
       -
                 // chance to finish their refreshing of the token. If a concurrent

     

       317
       -
                 // refresh did occur, we will pretend that this one succeeded.

     

       318
       -
                 if (!_runtime.hasImplementationLock) {

     

       319
       -
                   await Future.delayed(Duration(seconds: 1));

     

       320
       -
       

     

       321
       -
                   final stored = await getStored(sub);

     

       322
       -
                   if (stored == null) {

     

       323
       -
                     // A concurrent refresh occurred and caused the session to be

     

       324
       -
                     // deleted (for a reason we can't know at this point).

     

       325
       -
       

     

       326
       -
                     // Using a distinct error message mainly for debugging

     

       327
       -
                     // purposes. Also, throwing a TokenRefreshError to trigger

     

       328
       -
                     // deletion through the deleteOnError callback.

     

       329
       -
                     const msg = 'The session was deleted by another process';

     

       330
       -
                     throw TokenRefreshError(sub, msg, cause: cause);

     

       331
       -
                   } else if (stored.tokenSet.accessToken != tokenSet.accessToken ||

     

       332
       -
                       stored.tokenSet.refreshToken != tokenSet.refreshToken) {

     

       333
       -
                     // A concurrent refresh occurred. Pretend this one succeeded.

     

       334
       -
                     return stored;

     

       335
       -
                   } else {

     

       336
       -
                     // There were no concurrent refresh. The token is (likely)

     

       337
       -
                     // simply no longer valid.

     

       338
       -
                   }

     

       339
       -
                 }

     

       340
       -
       

     

       341
       -
                 // Make sure the session gets deleted from the store

     

       342
       -
                 final msg = cause.errorDescription ?? 'The session was revoked';

     

       343
       -
                 throw TokenRefreshError(sub, msg, cause: cause);

     

       344
       -
               }

     

       345
       -
       

     

       346
       -
               // Re-throw the original exception if it wasn't an invalid_grant error

     

       347
       -
               if (cause is Exception) {

     

       348
       -
                 throw cause;

     

       349
       -
               } else {

     

       350
       -
                 throw Exception('Token refresh failed: $cause');

     

       351
       -
               }

     

       352
       -
             }

     

       353
       -
           };

     

       354
       -
         }

     

       355
       -
       

     

       356
       -
         @override

     

       357
       -
         Future<void> setStored(String key, Session value) async {

     

       358
       -
           // Prevent tampering with the stored value

     

       359
       -
           if (key != value.tokenSet.sub) {

     

       360
       -
             throw TypeError();

     

       361
       -
           }

     

       362
       -
       

     

       363
       -
           await super.setStored(key, value);

     

       364
       -
       

     

       365
       -
           // Serialize authMethod to String for the event

     

       366
       -
           // authMethod can be Map<String, dynamic>, String, or null

     

       367
       -
           String? authMethodString;

     

       368
       -
           if (value.authMethod is Map) {

     

       369
       -
             authMethodString = jsonEncode(value.authMethod);

     

       370
       -
           } else if (value.authMethod is String) {

     

       371
       -
             authMethodString = value.authMethod as String;

     

       372
       -
           } else {

     

       373
       -
             authMethodString = null;

     

       374
       -
           }

     

       375
       -
       

     

       376
       -
           _dispatchUpdatedEvent(key, value.dpopKey, authMethodString, value.tokenSet);

     

       377
       -
         }

     

       378
       -
       

     

       379
       -
         @override

     

       380
       -
         Future<void> delStored(AtprotoDid key, [Object? cause]) async {

     

       381
       -
           await super.delStored(key, cause);

     

       382
       -
           _dispatchDeletedEvent(key, cause ?? Exception('Session deleted'));

     

       383
       -
         }

     

       384
       -
       

     

       385
       -
         /// Gets a session, optionally refreshing it.

     

       386
       -
         ///

     

       387
       -
         /// Parameters:

     

       388
       -
         /// - [sub]: The subject (user's DID)

     

       389
       -
         /// - [refresh]: When `true`, forces a token refresh even if not expired.

     

       390
       -
         ///   When `false`, uses cached tokens even if expired.

     

       391
       -
         ///   When `'auto'`, refreshes only if expired (default).

     

       392
       -
         Future<Session> getSession(AtprotoDid sub, [dynamic refresh = 'auto']) {

     

       393
       -
           return get(

     

       394
       -
             sub,

     

       395
       -
             GetCachedOptions(noCache: refresh == true, allowStale: refresh == false),

     

       396
       -
           );

     

       397
       -
         }

     

       398
       -
       

     

       399
       -
         @override

     

       400
       -
         Future<Session> get(AtprotoDid key, [GetCachedOptions? options]) async {

     

       401
       -
           final session = await _runtime.usingLock(

     

       402
       -
             '@atproto-oauth-client-$key',

     

       403
       -
             () async {

     

       404
       -
               // Make sure, even if there is no signal in the options, that the

     

       405
       -
               // request will be cancelled after at most 30 seconds.

     

       406
       -
               final timeoutToken = CancellationToken();

     

       407
       -
               final timeoutTimer = Timer(Duration(seconds: 30), () => timeoutToken.cancel());

     

       408
       -
       

     

       409
       -
               final combinedSignal =

     

       410
       -
                   options?.signal != null

     

       411
       -
                       ? combineSignals([options!.signal, timeoutToken])

     

       412
       -
                       : CombinedCancellationToken([timeoutToken]);

     

       413
       -
       

     

       414
       -
               try {

     

       415
       -
                 return await super.get(

     

       416
       -
                   key,

     

       417
       -
                   GetCachedOptions(

     

       418
       -
                     signal: CancellationToken(), // Use combined signal

     

       419
       -
                     noCache: options?.noCache,

     

       420
       -
                     allowStale: options?.allowStale,

     

       421
       -
                   ),

     

       422
       -
                 );

     

       423
       -
               } finally {

     

       424
       -
                 timeoutTimer.cancel(); // Cancel timer before disposing token

     

       425
       -
                 combinedSignal.dispose();

     

       426
       -
                 timeoutToken.dispose();

     

       427
       -
               }

     

       428
       -
             },

     

       429
       -
           );

     

       430
       -
       

     

       431
       -
           if (key != session.tokenSet.sub) {

     

       432
       -
             // Fool-proofing (e.g. against invalid session storage)

     

       433
       -
             throw Exception('Token set does not match the expected sub');

     

       434
       -
           }

     

       435
       -
       

     

       436
       -
           return session;

     

       437
       -
         }

     

       438
       -
       

     

       439
       -
         void _dispatchUpdatedEvent(

     

       440
       -
           String sub,

     

       441
       -
           Map<String, dynamic> dpopKey,

     

       442
       -
           String? authMethod,

     

       443
       -
           TokenSet tokenSet,

     

       444
       -
         ) {

     

       445
       -
           final event = SessionUpdatedEvent(

     

       446
       -
             sub: sub,

     

       447
       -
             dpopKey: dpopKey,

     

       448
       -
             authMethod: authMethod,

     

       449
       -
             tokenSet: tokenSet,

     

       450
       -
           );

     

       451
       -
       

     

       452
       -
           _updatedController.add(event);

     

       453
       -
           _eventTarget.dispatchCustomEvent('updated', event);

     

       454
       -
         }

     

       455
       -
       

     

       456
       -
         void _dispatchDeletedEvent(String sub, Object cause) {

     

       457
       -
           final event = SessionDeletedEvent(sub: sub, cause: cause);

     

       458
       -
       

     

       459
       -
           _deletedController.add(event);

     

       460
       -
           _eventTarget.dispatchCustomEvent('deleted', event);

     

       461
       -
         }

     

       462
       -
       

     

       463
       -
         /// Disposes of resources used by this session getter.

     

       464
       -
         void dispose() {

     

       465
       -
           _updatedController.close();

     

       466
       -
           _deletedController.close();

     

       467
       -
           _eventTarget.dispose();

     

       468
       -
         }

     

       469
       -
       }

     

       470
       -
       

     

       471
       -
       /// Placeholder for OAuthResponseError

     

       472
       -
       /// Will be implemented in later chunks

     

       473
       -
       class OAuthResponseError implements Exception {

     

       474
       -
         final int status;

     

       475
       -
         final String? error;

     

       476
       -
         final String? errorDescription;

     

       477
       -
       

     

       478
       -
         OAuthResponseError({required this.status, this.error, this.errorDescription});

     

       479
       -
       }

     

       480
       -
       

     

       481
       -
       /// Options for the CachedGetter.

     

       482
       -
       class CachedGetterOptions<K, V> {

     

       483
       -
         /// Function to determine if a cached value is stale

     

       484
       -
         final bool Function(K key, V value)? isStale;

     

       485
       -
       

     

       486
       -
         /// Function called when storing a value fails

     

       487
       -
         final Future<void> Function(Object err, K key, V value)? onStoreError;

     

       488
       -
       

     

       489
       -
         /// Function to determine if a value should be deleted on error

     

       490
       -
         final Future<bool> Function(Object err)? deleteOnError;

     

       491
       -
       

     

       492
       -
         const CachedGetterOptions({

     

       493
       -
           this.isStale,

     

       494
       -
           this.onStoreError,

     

       495
       -
           this.deleteOnError,

     

       496
       -
         });

     

       497
       -
       }

     

       498
       -
       

     

       499
       -
       /// A pending item in the cache.

     

       500
       -
       class _PendingItem<V> {

     

       501
       -
         final Future<({V value, bool isFresh})> future;

     

       502
       -
       

     

       503
       -
         _PendingItem(this.future);

     

       504
       -
       }

     

       505
       -
       

     

       506
       -
       /// Wrapper utility that uses a store to speed up the retrieval of values.

     

       507
       -
       ///

     

       508
       -
       /// The CachedGetter ensures that at most one fresh call is ever being made

     

       509
       -
       /// for a given key. It also contains logic for reading from the cache which,

     

       510
       -
       /// if the cache is based on localStorage/indexedDB, will sync across multiple

     

       511
       -
       /// tabs (for a given key).

     

       512
       -
       ///

     

       513
       -
       /// This is an abstract base class. Subclasses should provide the getter

     

       514
       -
       /// function and any additional logic.

     

       515
       -
       class CachedGetter<K, V> {

     

       516
       -
         final SimpleStore<K, V> _store;

     

       517
       -
         final CachedGetterOptions<K, V> _options;

     

       518
       -
         final Map<K, _PendingItem<V>> _pending = {};

     

       519
       -
       

     

       520
       -
         late Future<V> Function(K, GetCachedOptions, V?) _getter;

     

       521
       -
       

     

       522
       -
         CachedGetter({

     

       523
       -
           required SimpleStore<K, V> sessionStore,

     

       524
       -
           required Future<V> Function(K, GetCachedOptions, V?)? getter,

     

       525
       -
           required CachedGetterOptions<K, V> options,

     

       526
       -
         }) : _store = sessionStore,

     

       527
       -
              _options = options {

     

       528
       -
           if (getter != null) {

     

       529
       -
             _getter = getter;

     

       530
       -
           }

     

       531
       -
         }

     

       532
       -
       

     

       533
       -
         Future<V> get(K key, [GetCachedOptions? options]) async {

     

       534
       -
           options ??= GetCachedOptions();

     

       535
       -
           final signal = options.signal;

     

       536
       -
           final noCache = options.noCache ?? false;

     

       537
       -
           final allowStale = options.allowStale ?? false;

     

       538
       -
       

     

       539
       -
           signal?.throwIfCancelled();

     

       540
       -
       

     

       541
       -
           final isStale = _options.isStale;

     

       542
       -
           final deleteOnError = _options.deleteOnError;

     

       543
       -
       

     

       544
       -
           // Determine if a stored value can be used

     

       545
       -
           bool allowStored(V value) {

     

       546
       -
             if (noCache) return false; // Never allow stored values

     

       547
       -
             if (allowStale || isStale == null) return true; // Always allow

     

       548
       -
             return !isStale(key, value); // Check if stale

     

       549
       -
           }

     

       550
       -
       

     

       551
       -
           // As long as concurrent requests are made for the same key, only one

     

       552
       -
           // request will be made to the getStored & getter functions at a time.

     

       553
       -
           _PendingItem<V>? previousExecutionFlow;

     

       554
       -
           while ((previousExecutionFlow = _pending[key]) != null) {

     

       555
       -
             try {

     

       556
       -
               final result = await previousExecutionFlow!.future;

     

       557
       -
               final isFresh = result.isFresh;

     

       558
       -
               final value = result.value;

     

       559
       -
       

     

       560
       -
               // Use the concurrent request's result if it is fresh

     

       561
       -
               if (isFresh) return value;

     

       562
       -
               // Use the concurrent request's result if not fresh (loaded from the

     

       563
       -
               // store), and matches the conditions for using a stored value.

     

       564
       -
               if (allowStored(value)) return value;

     

       565
       -
             } catch (_) {

     

       566
       -
               // Ignore errors from previous execution flows (they will have been

     

       567
       -
               // propagated by that flow).

     

       568
       -
             }

     

       569
       -
       

     

       570
       -
             // Break the loop if the signal was cancelled

     

       571
       -
             signal?.throwIfCancelled();

     

       572
       -
           }

     

       573
       -
       

     

       574
       -
           final currentExecutionFlow = _PendingItem<V>(

     

       575
       -
             Future(() async {

     

       576
       -
               final storedValue = await getStored(key, signal: signal);

     

       577
       -
       

     

       578
       -
               if (storedValue != null && allowStored(storedValue)) {

     

       579
       -
                 // Use the stored value as return value for the current execution

     

       580
       -
                 // flow. Notify other concurrent execution flows that we got a value,

     

       581
       -
                 // but that it came from the store (isFresh = false).

     

       582
       -
                 return (value: storedValue, isFresh: false);

     

       583
       -
               }

     

       584
       -
       

     

       585
       -
               return Future(() async {

     

       586
       -
                     return await _getter(key, options!, storedValue);

     

       587
       -
                   })

     

       588
       -
                   .catchError((err) async {

     

       589
       -
                     if (storedValue != null) {

     

       590
       -
                       try {

     

       591
       -
                         if (deleteOnError != null && await deleteOnError(err)) {

     

       592
       -
                           await delStored(key, err);

     

       593
       -
                         }

     

       594
       -
                       } catch (error) {

     

       595
       -
                         throw Exception('Error while deleting stored value: $error');

     

       596
       -
                       }

     

       597
       -
                     }

     

       598
       -
                     throw err;

     

       599
       -
                   })

     

       600
       -
                   .then((value) async {

     

       601
       -
                     // The value should be stored even if the signal was cancelled.

     

       602
       -
                     await setStored(key, value);

     

       603
       -
                     return (value: value, isFresh: true);

     

       604
       -
                   });

     

       605
       -
             }).whenComplete(() {

     

       606
       -
               _pending.remove(key);

     

       607
       -
             }),

     

       608
       -
           );

     

       609
       -
       

     

       610
       -
           if (_pending.containsKey(key)) {

     

       611
       -
             // This should never happen. There must not be any 'await'

     

       612
       -
             // statement between this and the loop iteration check.

     

       613
       -
             throw Exception('Concurrent request for the same key');

     

       614
       -
           }

     

       615
       -
       

     

       616
       -
           _pending[key] = currentExecutionFlow;

     

       617
       -
       

     

       618
       -
           final result = await currentExecutionFlow.future;

     

       619
       -
           return result.value;

     

       620
       -
         }

     

       621
       -
       

     

       622
       -
         Future<V?> getStored(K key, {CancellationToken? signal}) async {

     

       623
       -
           try {

     

       624
       -
             return await _store.get(key, signal: signal);

     

       625
       -
           } catch (err) {

     

       626
       -
             return null;

     

       627
       -
           }

     

       628
       -
         }

     

       629
       -
       

     

       630
       -
         Future<void> setStored(K key, V value) async {

     

       631
       -
           try {

     

       632
       -
             await _store.set(key, value);

     

       633
       -
           } catch (err) {

     

       634
       -
             final onStoreError = _options.onStoreError;

     

       635
       -
             if (onStoreError != null) {

     

       636
       -
               await onStoreError(err, key, value);

     

       637
       -
             }

     

       638
       -
           }

     

       639
       -
         }

     

       640
       -
       

     

       641
       -
         Future<void> delStored(K key, [Object? cause]) async {

     

       642
       -
           await _store.del(key);

     

       643
       -
         }

     

       644
       -
       }

-112

packages/atproto_oauth_flutter/lib/src/session/state_store.dart

···

       1
       -
       /// Internal state data stored during OAuth authorization flow.

     

       2
       -
       ///

     

       3
       -
       /// This contains ephemeral data needed to complete the OAuth flow,

     

       4
       -
       /// such as PKCE code verifiers, state parameters, and nonces.

     

       5
       -
       class InternalStateData {

     

       6
       -
         /// The OAuth issuer URL

     

       7
       -
         final String iss;

     

       8
       -
       

     

       9
       -
         /// The DPoP key used for this authorization

     

       10
       -
         final Map<String, dynamic> dpopKey;

     

       11
       -
       

     

       12
       -
         /// Client authentication method (serialized as Map or String)

     

       13
       -
         ///

     

       14
       -
         /// Can be:

     

       15
       -
         /// - A Map containing {method: 'private_key_jwt', kid: '...'} for private key JWT

     

       16
       -
         /// - A Map containing {method: 'none'} for no authentication

     

       17
       -
         /// - A String 'legacy' for backwards compatibility

     

       18
       -
         /// - null (defaults to 'legacy' when loading)

     

       19
       -
         final dynamic authMethod;

     

       20
       -
       

     

       21
       -
         /// PKCE code verifier for authorization code flow

     

       22
       -
         final String? verifier;

     

       23
       -
       

     

       24
       -
         /// The redirect URI used during authorization

     

       25
       -
         /// MUST match exactly during token exchange

     

       26
       -
         final String? redirectUri;

     

       27
       -
       

     

       28
       -
         /// Application state to preserve across the OAuth flow

     

       29
       -
         final String? appState;

     

       30
       -
       

     

       31
       -
         const InternalStateData({

     

       32
       -
           required this.iss,

     

       33
       -
           required this.dpopKey,

     

       34
       -
           this.authMethod,

     

       35
       -
           this.verifier,

     

       36
       -
           this.redirectUri,

     

       37
       -
           this.appState,

     

       38
       -
         });

     

       39
       -
       

     

       40
       -
         /// Creates an instance from a JSON map.

     

       41
       -
         factory InternalStateData.fromJson(Map<String, dynamic> json) {

     

       42
       -
           return InternalStateData(

     

       43
       -
             iss: json['iss'] as String,

     

       44
       -
             dpopKey: json['dpopKey'] as Map<String, dynamic>,

     

       45
       -
             authMethod: json['authMethod'], // Can be Map or String

     

       46
       -
             verifier: json['verifier'] as String?,

     

       47
       -
             redirectUri: json['redirectUri'] as String?,

     

       48
       -
             appState: json['appState'] as String?,

     

       49
       -
           );

     

       50
       -
         }

     

       51
       -
       

     

       52
       -
         /// Converts this instance to a JSON map.

     

       53
       -
         Map<String, dynamic> toJson() {

     

       54
       -
           final json = <String, dynamic>{'iss': iss, 'dpopKey': dpopKey};

     

       55
       -
       

     

       56
       -
           if (authMethod != null) json['authMethod'] = authMethod;

     

       57
       -
           if (verifier != null) json['verifier'] = verifier;

     

       58
       -
           if (redirectUri != null) json['redirectUri'] = redirectUri;

     

       59
       -
           if (appState != null) json['appState'] = appState;

     

       60
       -
       

     

       61
       -
           return json;

     

       62
       -
         }

     

       63
       -
       }

     

       64
       -
       

     

       65
       -
       /// Abstract storage interface for OAuth state data.

     

       66
       -
       ///

     

       67
       -
       /// Implementations should store state data temporarily during the OAuth flow.

     

       68
       -
       /// This data is typically short-lived and can be cleared after successful

     

       69
       -
       /// authorization or timeout.

     

       70
       -
       ///

     

       71
       -
       /// Example implementation using in-memory storage:

     

       72
       -
       /// ```dart

     

       73
       -
       /// class MemoryStateStore implements StateStore {

     

       74
       -
       ///   final Map<String, InternalStateData> _store = {};

     

       75
       -
       ///

     

       76
       -
       ///   @override

     

       77
       -
       ///   Future<InternalStateData?> get(String key) async => _store[key];

     

       78
       -
       ///

     

       79
       -
       ///   @override

     

       80
       -
       ///   Future<void> set(String key, InternalStateData data) async {

     

       81
       -
       ///     _store[key] = data;

     

       82
       -
       ///   }

     

       83
       -
       ///

     

       84
       -
       ///   @override

     

       85
       -
       ///   Future<void> del(String key) async {

     

       86
       -
       ///     _store.remove(key);

     

       87
       -
       ///   }

     

       88
       -
       /// }

     

       89
       -
       /// ```

     

       90
       -
       abstract class StateStore {

     

       91
       -
         /// Retrieves state data for the given key.

     

       92
       -
         ///

     

       93
       -
         /// Returns `null` if no data exists for the key.

     

       94
       -
         Future<InternalStateData?> get(String key);

     

       95
       -
       

     

       96
       -
         /// Stores state data for the given key.

     

       97
       -
         ///

     

       98
       -
         /// Overwrites any existing data for the key.

     

       99
       -
         Future<void> set(String key, InternalStateData data);

     

       100
       -
       

     

       101
       -
         /// Deletes state data for the given key.

     

       102
       -
         ///

     

       103
       -
         /// Does nothing if no data exists for the key.

     

       104
       -
         Future<void> del(String key);

     

       105
       -
       

     

       106
       -
         /// Optionally clears all state data.

     

       107
       -
         ///

     

       108
       -
         /// Implementations may choose not to implement this method.

     

       109
       -
         Future<void> clear() async {

     

       110
       -
           // Default implementation does nothing

     

       111
       -
         }

     

       112
       -
       }

-352

packages/atproto_oauth_flutter/lib/src/types.dart

···

       1
       -
       // Note: These types are not prefixed with `OAuth` because they are not specific

     

       2
       -
       // to OAuth. They are specific to this package. OAuth specific types will be in

     

       3
       -
       // a separate oauth-types module or imported from an external package.

     

       4
       -
       

     

       5
       -
       // TODO: These types currently reference schemas from @atproto/oauth-types which

     

       6
       -
       // need to be ported to Dart. For now, we're using Map<String, dynamic> as placeholders.

     

       7
       -
       // These will be replaced with proper typed classes once oauth-types is ported.

     

       8
       -
       

     

       9
       -
       /// Options for initiating an authorization request.

     

       10
       -
       ///

     

       11
       -
       /// Omits client_id, response_mode, response_type, login_hint,

     

       12
       -
       /// code_challenge, and code_challenge_method from OAuthAuthorizationRequestParameters

     

       13
       -
       /// as these are managed internally.

     

       14
       -
       class AuthorizeOptions {

     

       15
       -
         /// Optional URI to redirect to after authorization

     

       16
       -
         final String? redirectUri;

     

       17
       -
       

     

       18
       -
         /// Optional state parameter for CSRF protection

     

       19
       -
         final String? state;

     

       20
       -
       

     

       21
       -
         /// Optional scope parameter defining requested permissions

     

       22
       -
         final String? scope;

     

       23
       -
       

     

       24
       -
         /// Optional nonce parameter for replay protection

     

       25
       -
         final String? nonce;

     

       26
       -
       

     

       27
       -
         /// Optional DPoP JKT (JSON Web Key Thumbprint)

     

       28
       -
         final String? dpopJkt;

     

       29
       -
       

     

       30
       -
         /// Optional max age in seconds for authentication

     

       31
       -
         final int? maxAge;

     

       32
       -
       

     

       33
       -
         /// Optional claims parameter

     

       34
       -
         final Map<String, dynamic>? claims;

     

       35
       -
       

     

       36
       -
         /// Optional UI locales

     

       37
       -
         final String? uiLocales;

     

       38
       -
       

     

       39
       -
         /// Optional ID token hint

     

       40
       -
         final String? idTokenHint;

     

       41
       -
       

     

       42
       -
         /// Optional display mode

     

       43
       -
         final String? display;

     

       44
       -
       

     

       45
       -
         /// Optional prompt value

     

       46
       -
         final String? prompt;

     

       47
       -
       

     

       48
       -
         /// Optional authorization details

     

       49
       -
         final Map<String, dynamic>? authorizationDetails;

     

       50
       -
       

     

       51
       -
         const AuthorizeOptions({

     

       52
       -
           this.redirectUri,

     

       53
       -
           this.state,

     

       54
       -
           this.scope,

     

       55
       -
           this.nonce,

     

       56
       -
           this.dpopJkt,

     

       57
       -
           this.maxAge,

     

       58
       -
           this.claims,

     

       59
       -
           this.uiLocales,

     

       60
       -
           this.idTokenHint,

     

       61
       -
           this.display,

     

       62
       -
           this.prompt,

     

       63
       -
           this.authorizationDetails,

     

       64
       -
         });

     

       65
       -
       

     

       66
       -
         Map<String, dynamic> toJson() {

     

       67
       -
           final map = <String, dynamic>{};

     

       68
       -
           if (redirectUri != null) map['redirect_uri'] = redirectUri;

     

       69
       -
           if (state != null) map['state'] = state;

     

       70
       -
           if (scope != null) map['scope'] = scope;

     

       71
       -
           if (nonce != null) map['nonce'] = nonce;

     

       72
       -
           if (dpopJkt != null) map['dpop_jkt'] = dpopJkt;

     

       73
       -
           if (maxAge != null) map['max_age'] = maxAge;

     

       74
       -
           if (claims != null) map['claims'] = claims;

     

       75
       -
           if (uiLocales != null) map['ui_locales'] = uiLocales;

     

       76
       -
           if (idTokenHint != null) map['id_token_hint'] = idTokenHint;

     

       77
       -
           if (display != null) map['display'] = display;

     

       78
       -
           if (prompt != null) map['prompt'] = prompt;

     

       79
       -
           if (authorizationDetails != null) {

     

       80
       -
             map['authorization_details'] = authorizationDetails;

     

       81
       -
           }

     

       82
       -
           return map;

     

       83
       -
         }

     

       84
       -
       }

     

       85
       -
       

     

       86
       -
       /// Options for handling OAuth callback.

     

       87
       -
       class CallbackOptions {

     

       88
       -
         /// Optional redirect URI that was used in the authorization request

     

       89
       -
         final String? redirectUri;

     

       90
       -
       

     

       91
       -
         const CallbackOptions({this.redirectUri});

     

       92
       -
       

     

       93
       -
         Map<String, dynamic> toJson() {

     

       94
       -
           final map = <String, dynamic>{};

     

       95
       -
           if (redirectUri != null) map['redirect_uri'] = redirectUri;

     

       96
       -
           return map;

     

       97
       -
         }

     

       98
       -
       }

     

       99
       -
       

     

       100
       -
       /// Client metadata for OAuth configuration.

     

       101
       -
       ///

     

       102
       -
       /// TODO: This extends the base oauthClientMetadataSchema with specific

     

       103
       -
       /// client_id validation. Once oauth-types is ported, this will properly

     

       104
       -
       /// validate client_id as either discoverable or loopback type.

     

       105
       -
       class ClientMetadata {

     

       106
       -
         /// Client identifier (either discoverable HTTPS URI or loopback URI)

     

       107
       -
         final String? clientId;

     

       108
       -
       

     

       109
       -
         /// Array of redirect URIs

     

       110
       -
         final List<String> redirectUris;

     

       111
       -
       

     

       112
       -
         /// Response types supported by the client

     

       113
       -
         final List<String> responseTypes;

     

       114
       -
       

     

       115
       -
         /// Grant types supported by the client

     

       116
       -
         final List<String> grantTypes;

     

       117
       -
       

     

       118
       -
         /// Optional scope

     

       119
       -
         final String? scope;

     

       120
       -
       

     

       121
       -
         /// Token endpoint authentication method

     

       122
       -
         final String tokenEndpointAuthMethod;

     

       123
       -
       

     

       124
       -
         /// Optional token endpoint authentication signing algorithm

     

       125
       -
         final String? tokenEndpointAuthSigningAlg;

     

       126
       -
       

     

       127
       -
         /// Optional userinfo signed response algorithm

     

       128
       -
         final String? userinfoSignedResponseAlg;

     

       129
       -
       

     

       130
       -
         /// Optional userinfo encrypted response algorithm

     

       131
       -
         final String? userinfoEncryptedResponseAlg;

     

       132
       -
       

     

       133
       -
         /// Optional JWKS URI

     

       134
       -
         final String? jwksUri;

     

       135
       -
       

     

       136
       -
         /// Optional JWKS

     

       137
       -
         final Map<String, dynamic>? jwks;

     

       138
       -
       

     

       139
       -
         /// Application type (web or native)

     

       140
       -
         final String applicationType;

     

       141
       -
       

     

       142
       -
         /// Subject type (public or pairwise)

     

       143
       -
         final String subjectType;

     

       144
       -
       

     

       145
       -
         /// Optional request object signing algorithm

     

       146
       -
         final String? requestObjectSigningAlg;

     

       147
       -
       

     

       148
       -
         /// Optional ID token signed response algorithm

     

       149
       -
         final String? idTokenSignedResponseAlg;

     

       150
       -
       

     

       151
       -
         /// Authorization signed response algorithm

     

       152
       -
         final String authorizationSignedResponseAlg;

     

       153
       -
       

     

       154
       -
         /// Optional authorization encrypted response encoding

     

       155
       -
         final String? authorizationEncryptedResponseEnc;

     

       156
       -
       

     

       157
       -
         /// Optional authorization encrypted response algorithm

     

       158
       -
         final String? authorizationEncryptedResponseAlg;

     

       159
       -
       

     

       160
       -
         /// Optional client name

     

       161
       -
         final String? clientName;

     

       162
       -
       

     

       163
       -
         /// Optional client URI

     

       164
       -
         final String? clientUri;

     

       165
       -
       

     

       166
       -
         /// Optional policy URI

     

       167
       -
         final String? policyUri;

     

       168
       -
       

     

       169
       -
         /// Optional terms of service URI

     

       170
       -
         final String? tosUri;

     

       171
       -
       

     

       172
       -
         /// Optional logo URI

     

       173
       -
         final String? logoUri;

     

       174
       -
       

     

       175
       -
         /// Optional default max age

     

       176
       -
         final int? defaultMaxAge;

     

       177
       -
       

     

       178
       -
         /// Optional require auth time

     

       179
       -
         final bool? requireAuthTime;

     

       180
       -
       

     

       181
       -
         /// Optional contact emails

     

       182
       -
         final List<String>? contacts;

     

       183
       -
       

     

       184
       -
         /// Optional TLS client certificate bound access tokens

     

       185
       -
         final bool? tlsClientCertificateBoundAccessTokens;

     

       186
       -
       

     

       187
       -
         /// Optional DPoP bound access tokens

     

       188
       -
         final bool? dpopBoundAccessTokens;

     

       189
       -
       

     

       190
       -
         /// Optional authorization details types

     

       191
       -
         final List<String>? authorizationDetailsTypes;

     

       192
       -
       

     

       193
       -
         const ClientMetadata({

     

       194
       -
           this.clientId,

     

       195
       -
           required this.redirectUris,

     

       196
       -
           this.responseTypes = const ['code'],

     

       197
       -
           this.grantTypes = const ['authorization_code'],

     

       198
       -
           this.scope,

     

       199
       -
           this.tokenEndpointAuthMethod = 'client_secret_basic',

     

       200
       -
           this.tokenEndpointAuthSigningAlg,

     

       201
       -
           this.userinfoSignedResponseAlg,

     

       202
       -
           this.userinfoEncryptedResponseAlg,

     

       203
       -
           this.jwksUri,

     

       204
       -
           this.jwks,

     

       205
       -
           this.applicationType = 'web',

     

       206
       -
           this.subjectType = 'public',

     

       207
       -
           this.requestObjectSigningAlg,

     

       208
       -
           this.idTokenSignedResponseAlg,

     

       209
       -
           this.authorizationSignedResponseAlg = 'RS256',

     

       210
       -
           this.authorizationEncryptedResponseEnc,

     

       211
       -
           this.authorizationEncryptedResponseAlg,

     

       212
       -
           this.clientName,

     

       213
       -
           this.clientUri,

     

       214
       -
           this.policyUri,

     

       215
       -
           this.tosUri,

     

       216
       -
           this.logoUri,

     

       217
       -
           this.defaultMaxAge,

     

       218
       -
           this.requireAuthTime,

     

       219
       -
           this.contacts,

     

       220
       -
           this.tlsClientCertificateBoundAccessTokens,

     

       221
       -
           this.dpopBoundAccessTokens,

     

       222
       -
           this.authorizationDetailsTypes,

     

       223
       -
         });

     

       224
       -
       

     

       225
       -
         Map<String, dynamic> toJson() {

     

       226
       -
           final map = <String, dynamic>{

     

       227
       -
             'redirect_uris': redirectUris,

     

       228
       -
             'response_types': responseTypes,

     

       229
       -
             'grant_types': grantTypes,

     

       230
       -
             'token_endpoint_auth_method': tokenEndpointAuthMethod,

     

       231
       -
             'application_type': applicationType,

     

       232
       -
             'subject_type': subjectType,

     

       233
       -
             'authorization_signed_response_alg': authorizationSignedResponseAlg,

     

       234
       -
           };

     

       235
       -
       

     

       236
       -
           if (clientId != null) map['client_id'] = clientId;

     

       237
       -
           if (scope != null) map['scope'] = scope;

     

       238
       -
           if (tokenEndpointAuthSigningAlg != null) {

     

       239
       -
             map['token_endpoint_auth_signing_alg'] = tokenEndpointAuthSigningAlg;

     

       240
       -
           }

     

       241
       -
           if (userinfoSignedResponseAlg != null) {

     

       242
       -
             map['userinfo_signed_response_alg'] = userinfoSignedResponseAlg;

     

       243
       -
           }

     

       244
       -
           if (userinfoEncryptedResponseAlg != null) {

     

       245
       -
             map['userinfo_encrypted_response_alg'] = userinfoEncryptedResponseAlg;

     

       246
       -
           }

     

       247
       -
           if (jwksUri != null) map['jwks_uri'] = jwksUri;

     

       248
       -
           if (jwks != null) map['jwks'] = jwks;

     

       249
       -
           if (requestObjectSigningAlg != null) {

     

       250
       -
             map['request_object_signing_alg'] = requestObjectSigningAlg;

     

       251
       -
           }

     

       252
       -
           if (idTokenSignedResponseAlg != null) {

     

       253
       -
             map['id_token_signed_response_alg'] = idTokenSignedResponseAlg;

     

       254
       -
           }

     

       255
       -
           if (authorizationEncryptedResponseEnc != null) {

     

       256
       -
             map['authorization_encrypted_response_enc'] =

     

       257
       -
                 authorizationEncryptedResponseEnc;

     

       258
       -
           }

     

       259
       -
           if (authorizationEncryptedResponseAlg != null) {

     

       260
       -
             map['authorization_encrypted_response_alg'] =

     

       261
       -
                 authorizationEncryptedResponseAlg;

     

       262
       -
           }

     

       263
       -
           if (clientName != null) map['client_name'] = clientName;

     

       264
       -
           if (clientUri != null) map['client_uri'] = clientUri;

     

       265
       -
           if (policyUri != null) map['policy_uri'] = policyUri;

     

       266
       -
           if (tosUri != null) map['tos_uri'] = tosUri;

     

       267
       -
           if (logoUri != null) map['logo_uri'] = logoUri;

     

       268
       -
           if (defaultMaxAge != null) map['default_max_age'] = defaultMaxAge;

     

       269
       -
           if (requireAuthTime != null) map['require_auth_time'] = requireAuthTime;

     

       270
       -
           if (contacts != null) map['contacts'] = contacts;

     

       271
       -
           if (tlsClientCertificateBoundAccessTokens != null) {

     

       272
       -
             map['tls_client_certificate_bound_access_tokens'] =

     

       273
       -
                 tlsClientCertificateBoundAccessTokens;

     

       274
       -
           }

     

       275
       -
           if (dpopBoundAccessTokens != null) {

     

       276
       -
             map['dpop_bound_access_tokens'] = dpopBoundAccessTokens;

     

       277
       -
           }

     

       278
       -
           if (authorizationDetailsTypes != null) {

     

       279
       -
             map['authorization_details_types'] = authorizationDetailsTypes;

     

       280
       -
           }

     

       281
       -
       

     

       282
       -
           return map;

     

       283
       -
         }

     

       284
       -
       

     

       285
       -
         factory ClientMetadata.fromJson(Map<String, dynamic> json) {

     

       286
       -
           return ClientMetadata(

     

       287
       -
             clientId: json['client_id'] as String?,

     

       288
       -
             redirectUris:

     

       289
       -
                 json['redirect_uris'] != null

     

       290
       -
                     ? (json['redirect_uris'] as List<dynamic>)

     

       291
       -
                         .map((e) => e as String)

     

       292
       -
                         .toList()

     

       293
       -
                     : [],

     

       294
       -
             responseTypes:

     

       295
       -
                 json['response_types'] != null

     

       296
       -
                     ? (json['response_types'] as List<dynamic>)

     

       297
       -
                         .map((e) => e as String)

     

       298
       -
                         .toList()

     

       299
       -
                     : const ['code'],

     

       300
       -
             grantTypes:

     

       301
       -
                 json['grant_types'] != null

     

       302
       -
                     ? (json['grant_types'] as List<dynamic>)

     

       303
       -
                         .map((e) => e as String)

     

       304
       -
                         .toList()

     

       305
       -
                     : const ['authorization_code'],

     

       306
       -
             scope: json['scope'] as String?,

     

       307
       -
             tokenEndpointAuthMethod:

     

       308
       -
                 json['token_endpoint_auth_method'] as String? ??

     

       309
       -
                 'client_secret_basic',

     

       310
       -
             tokenEndpointAuthSigningAlg:

     

       311
       -
                 json['token_endpoint_auth_signing_alg'] as String?,

     

       312
       -
             userinfoSignedResponseAlg:

     

       313
       -
                 json['userinfo_signed_response_alg'] as String?,

     

       314
       -
             userinfoEncryptedResponseAlg:

     

       315
       -
                 json['userinfo_encrypted_response_alg'] as String?,

     

       316
       -
             jwksUri: json['jwks_uri'] as String?,

     

       317
       -
             jwks: json['jwks'] as Map<String, dynamic>?,

     

       318
       -
             applicationType: json['application_type'] as String? ?? 'web',

     

       319
       -
             subjectType: json['subject_type'] as String? ?? 'public',

     

       320
       -
             requestObjectSigningAlg: json['request_object_signing_alg'] as String?,

     

       321
       -
             idTokenSignedResponseAlg: json['id_token_signed_response_alg'] as String?,

     

       322
       -
             authorizationSignedResponseAlg:

     

       323
       -
                 json['authorization_signed_response_alg'] as String? ?? 'RS256',

     

       324
       -
             authorizationEncryptedResponseEnc:

     

       325
       -
                 json['authorization_encrypted_response_enc'] as String?,

     

       326
       -
             authorizationEncryptedResponseAlg:

     

       327
       -
                 json['authorization_encrypted_response_alg'] as String?,

     

       328
       -
             clientName: json['client_name'] as String?,

     

       329
       -
             clientUri: json['client_uri'] as String?,

     

       330
       -
             policyUri: json['policy_uri'] as String?,

     

       331
       -
             tosUri: json['tos_uri'] as String?,

     

       332
       -
             logoUri: json['logo_uri'] as String?,

     

       333
       -
             defaultMaxAge: json['default_max_age'] as int?,

     

       334
       -
             requireAuthTime: json['require_auth_time'] as bool?,

     

       335
       -
             contacts:

     

       336
       -
                 json['contacts'] != null

     

       337
       -
                     ? (json['contacts'] as List<dynamic>)

     

       338
       -
                         .map((e) => e as String)

     

       339
       -
                         .toList()

     

       340
       -
                     : null,

     

       341
       -
             tlsClientCertificateBoundAccessTokens:

     

       342
       -
                 json['tls_client_certificate_bound_access_tokens'] as bool?,

     

       343
       -
             dpopBoundAccessTokens: json['dpop_bound_access_tokens'] as bool?,

     

       344
       -
             authorizationDetailsTypes:

     

       345
       -
                 json['authorization_details_types'] != null

     

       346
       -
                     ? (json['authorization_details_types'] as List<dynamic>)

     

       347
       -
                         .map((e) => e as String)

     

       348
       -
                         .toList()

     

       349
       -
                     : null,

     

       350
       -
           );

     

       351
       -
         }

     

       352
       -
       }

-195

packages/atproto_oauth_flutter/lib/src/util.dart

···

       1
       -
       import 'dart:async';

     

       2
       -
       

     

       3
       -
       /// Returns the input if it's a String, otherwise returns null.

     

       4
       -
       String? ifString<V>(V v) => v is String ? v : null;

     

       5
       -
       

     

       6
       -
       /// Extracts the MIME type from Content-Type header.

     

       7
       -
       ///

     

       8
       -
       /// Example: "application/json; charset=utf-8" -> "application/json"

     

       9
       -
       String? contentMime(Map<String, String> headers) {

     

       10
       -
         final contentType = headers['content-type'];

     

       11
       -
         if (contentType == null) return null;

     

       12
       -
         return contentType.split(';')[0].trim();

     

       13
       -
       }

     

       14
       -
       

     

       15
       -
       /// Event detail map for custom event handling.

     

       16
       -
       ///

     

       17
       -
       /// This is a simplified version of TypeScript's CustomEvent pattern,

     

       18
       -
       /// adapted for Dart using StreamController and typed events.

     

       19
       -
       ///

     

       20
       -
       /// Example:

     

       21
       -
       /// ```dart

     

       22
       -
       /// final target = CustomEventTarget();

     

       23
       -
       /// final subscription = target.addEventListener('myEvent', (String detail) {

     

       24
       -
       ///   print('Received: $detail');

     

       25
       -
       /// });

     

       26
       -
       ///

     

       27
       -
       /// // Later, to remove the listener:

     

       28
       -
       /// subscription.cancel();

     

       29
       -
       /// ```

     

       30
       -
       class CustomEventTarget<EventDetailMap> {

     

       31
       -
         final Map<String, StreamController<dynamic>> _controllers = {};

     

       32
       -
       

     

       33
       -
         /// Add an event listener for a specific event type.

     

       34
       -
         ///

     

       35
       -
         /// Returns a [StreamSubscription] that can be cancelled to remove the listener.

     

       36
       -
         ///

     

       37
       -
         /// Throws [TypeError] if an event type is already registered with a different type parameter.

     

       38
       -
         ///

     

       39
       -
         /// Example:

     

       40
       -
         /// ```dart

     

       41
       -
         /// final subscription = target.addEventListener('event', (detail) => print(detail));

     

       42
       -
         /// subscription.cancel(); // Remove this specific listener

     

       43
       -
         /// ```

     

       44
       -
         StreamSubscription<T> addEventListener<T>(

     

       45
       -
           String type,

     

       46
       -
           void Function(T detail) callback,

     

       47
       -
         ) {

     

       48
       -
           final existingController = _controllers[type];

     

       49
       -
       

     

       50
       -
           // Check if a controller already exists with a different type

     

       51
       -
           if (existingController != null &&

     

       52
       -
               existingController is! StreamController<T>) {

     

       53
       -
             throw TypeError();

     

       54
       -
           }

     

       55
       -
       

     

       56
       -
           final controller =

     

       57
       -
               _controllers.putIfAbsent(type, () => StreamController<T>.broadcast())

     

       58
       -
                   as StreamController<T>;

     

       59
       -
       

     

       60
       -
           return controller.stream.listen(callback);

     

       61
       -
         }

     

       62
       -
       

     

       63
       -
         /// Dispatch a custom event with detail data.

     

       64
       -
         ///

     

       65
       -
         /// Returns true if the event was dispatched successfully.

     

       66
       -
         bool dispatchCustomEvent<T>(String type, T detail) {

     

       67
       -
           final controller = _controllers[type];

     

       68
       -
           if (controller == null) return false;

     

       69
       -
       

     

       70
       -
           (controller as StreamController<T>).add(detail);

     

       71
       -
           return true;

     

       72
       -
         }

     

       73
       -
       

     

       74
       -
         /// Dispose of all stream controllers.

     

       75
       -
         ///

     

       76
       -
         /// Call this when the event target is no longer needed to prevent memory leaks.

     

       77
       -
         void dispose() {

     

       78
       -
           for (final controller in _controllers.values) {

     

       79
       -
             controller.close();

     

       80
       -
           }

     

       81
       -
           _controllers.clear();

     

       82
       -
         }

     

       83
       -
       }

     

       84
       -
       

     

       85
       -
       /// Combines multiple cancellation tokens into a single cancellable operation.

     

       86
       -
       ///

     

       87
       -
       /// This is a Dart adaptation of the TypeScript combineSignals function.

     

       88
       -
       /// Since Dart doesn't have AbortSignal/AbortController, we use CancellationToken

     

       89
       -
       /// pattern with StreamController.

     

       90
       -
       ///

     

       91
       -
       /// The returned controller will be cancelled if any of the input tokens are cancelled.

     

       92
       -
       class CombinedCancellationToken {

     

       93
       -
         final StreamController<void> _controller = StreamController<void>.broadcast();

     

       94
       -
         final List<StreamSubscription<void>> _subscriptions = [];

     

       95
       -
         bool _isCancelled = false;

     

       96
       -
         Object? _reason;

     

       97
       -
       

     

       98
       -
         CombinedCancellationToken(List<CancellationToken?> tokens) {

     

       99
       -
           for (final token in tokens) {

     

       100
       -
             if (token != null) {

     

       101
       -
               if (token.isCancelled) {

     

       102
       -
                 cancel(Exception('Operation was cancelled: ${token.reason}'));

     

       103
       -
                 return;

     

       104
       -
               }

     

       105
       -
       

     

       106
       -
               final subscription = token.stream.listen((_) {

     

       107
       -
                 cancel(Exception('Operation was cancelled: ${token.reason}'));

     

       108
       -
               });

     

       109
       -
               _subscriptions.add(subscription);

     

       110
       -
             }

     

       111
       -
           }

     

       112
       -
         }

     

       113
       -
       

     

       114
       -
         /// Whether this operation has been cancelled.

     

       115
       -
         bool get isCancelled => _isCancelled;

     

       116
       -
       

     

       117
       -
         /// The reason for cancellation, if any.

     

       118
       -
         Object? get reason => _reason;

     

       119
       -
       

     

       120
       -
         /// Stream that emits when the operation is cancelled.

     

       121
       -
         Stream<void> get stream => _controller.stream;

     

       122
       -
       

     

       123
       -
         /// Cancel the operation with an optional reason.

     

       124
       -
         void cancel([Object? reason]) {

     

       125
       -
           if (_isCancelled) return;

     

       126
       -
       

     

       127
       -
           _isCancelled = true;

     

       128
       -
           _reason = reason ?? Exception('Operation was cancelled');

     

       129
       -
       

     

       130
       -
           _controller.add(null);

     

       131
       -
           dispose();

     

       132
       -
         }

     

       133
       -
       

     

       134
       -
         /// Clean up resources.

     

       135
       -
         void dispose() {

     

       136
       -
           for (final subscription in _subscriptions) {

     

       137
       -
             subscription.cancel();

     

       138
       -
           }

     

       139
       -
           _subscriptions.clear();

     

       140
       -
           _controller.close();

     

       141
       -
         }

     

       142
       -
       }

     

       143
       -
       

     

       144
       -
       /// Represents a cancellable operation.

     

       145
       -
       ///

     

       146
       -
       /// This is a Dart equivalent of AbortSignal in JavaScript.

     

       147
       -
       class CancellationToken {

     

       148
       -
         final StreamController<void> _controller = StreamController<void>.broadcast();

     

       149
       -
         bool _isCancelled = false;

     

       150
       -
         Object? _reason;

     

       151
       -
       

     

       152
       -
         CancellationToken();

     

       153
       -
       

     

       154
       -
         /// Whether this operation has been cancelled.

     

       155
       -
         bool get isCancelled => _isCancelled;

     

       156
       -
       

     

       157
       -
         /// The reason for cancellation, if any.

     

       158
       -
         Object? get reason => _reason;

     

       159
       -
       

     

       160
       -
         /// Stream that emits when the operation is cancelled.

     

       161
       -
         Stream<void> get stream => _controller.stream;

     

       162
       -
       

     

       163
       -
         /// Cancel the operation with an optional reason.

     

       164
       -
         void cancel([Object? reason]) {

     

       165
       -
           if (_isCancelled) return;

     

       166
       -
       

     

       167
       -
           _isCancelled = true;

     

       168
       -
           _reason = reason ?? Exception('Operation was cancelled');

     

       169
       -
       

     

       170
       -
           // Only add to stream if not already closed

     

       171
       -
           if (!_controller.isClosed) {

     

       172
       -
             _controller.add(null);

     

       173
       -
           }

     

       174
       -
         }

     

       175
       -
       

     

       176
       -
         /// Throw an exception if the operation has been cancelled.

     

       177
       -
         void throwIfCancelled() {

     

       178
       -
           if (_isCancelled) {

     

       179
       -
             throw _reason ?? Exception('Operation was cancelled');

     

       180
       -
           }

     

       181
       -
         }

     

       182
       -
       

     

       183
       -
         /// Dispose of the stream controller.

     

       184
       -
         void dispose() {

     

       185
       -
           _controller.close();

     

       186
       -
         }

     

       187
       -
       }

     

       188
       -
       

     

       189
       -
       /// Combines multiple cancellation tokens into a single token.

     

       190
       -
       ///

     

       191
       -
       /// If any of the input tokens are cancelled, the returned token will also be cancelled.

     

       192
       -
       /// The returned token should be disposed when no longer needed.

     

       193
       -
       CombinedCancellationToken combineSignals(List<CancellationToken?> signals) {

     

       194
       -
         return CombinedCancellationToken(signals);

     

       195
       -
       }

-100

packages/atproto_oauth_flutter/lib/src/utils/lock.dart

···

       1
       -
       import 'dart:async';

     

       2
       -
       

     

       3
       -
       import '../runtime/runtime_implementation.dart';

     

       4
       -
       

     

       5
       -
       /// A map storing active locks by name.

     

       6
       -
       ///

     

       7
       -
       /// Each lock is represented as a Future that completes when the lock is released.

     

       8
       -
       /// This allows queuing of operations waiting for the same lock.

     

       9
       -
       final Map<Object, Future<void>> _locks = {};

     

       10
       -
       

     

       11
       -
       /// Acquires a lock for the given name.

     

       12
       -
       ///

     

       13
       -
       /// Returns a function that releases the lock when called.

     

       14
       -
       /// The lock is automatically added to the queue of pending operations.

     

       15
       -
       ///

     

       16
       -
       /// This implements a fair (FIFO) mutex pattern where operations are executed

     

       17
       -
       /// in the order they acquire the lock.

     

       18
       -
       Future<void Function()> _acquireLocalLock(Object name) {

     

       19
       -
         final completer = Completer<void Function()>();

     

       20
       -
       

     

       21
       -
         // Get the previous lock in the queue (or a resolved promise if none)

     

       22
       -
         final prev = _locks[name] ?? Future.value();

     

       23
       -
       

     

       24
       -
         // Create a completer for the release function

     

       25
       -
         final releaseCompleter = Completer<void>();

     

       26
       -
       

     

       27
       -
         // Chain onto the previous lock

     

       28
       -
         final next = prev.then((_) {

     

       29
       -
           // This runs when we've acquired the lock

     

       30
       -
           return releaseCompleter.future;

     

       31
       -
         });

     

       32
       -
       

     

       33
       -
         // Store our lock as the new tail of the queue

     

       34
       -
         _locks[name] = next;

     

       35
       -
       

     

       36
       -
         // Resolve the acquire promise with the release function

     

       37
       -
         prev.then((_) {

     

       38
       -
           void release() {

     

       39
       -
             // Only delete the lock if it's still the current one

     

       40
       -
             // (it might have been replaced by a newer lock)

     

       41
       -
             if (_locks[name] == next) {

     

       42
       -
               _locks.remove(name);

     

       43
       -
             }

     

       44
       -
       

     

       45
       -
             // Complete the release, allowing the next operation to proceed

     

       46
       -
             if (!releaseCompleter.isCompleted) {

     

       47
       -
               releaseCompleter.complete();

     

       48
       -
             }

     

       49
       -
           }

     

       50
       -
       

     

       51
       -
           completer.complete(release);

     

       52
       -
         });

     

       53
       -
       

     

       54
       -
         return completer.future;

     

       55
       -
       }

     

       56
       -
       

     

       57
       -
       /// Executes a function while holding a named lock.

     

       58
       -
       ///

     

       59
       -
       /// This is a local (in-memory) lock implementation that prevents concurrent

     

       60
       -
       /// execution of the same operation within a single isolate/process.

     

       61
       -
       ///

     

       62
       -
       /// The lock is automatically released when the function completes or throws an error.

     

       63
       -
       ///

     

       64
       -
       /// Example:

     

       65
       -
       /// ```dart

     

       66
       -
       /// final result = await requestLocalLock('my-operation', () async {

     

       67
       -
       ///   // Only one execution at a time for 'my-operation'

     

       68
       -
       ///   return await performCriticalOperation();

     

       69
       -
       /// });

     

       70
       -
       /// ```

     

       71
       -
       ///

     

       72
       -
       /// Use cases:

     

       73
       -
       /// - Token refresh (prevent multiple simultaneous refresh requests)

     

       74
       -
       /// - Database transactions

     

       75
       -
       /// - File operations

     

       76
       -
       /// - Any operation that must not run concurrently with itself

     

       77
       -
       ///

     

       78
       -
       /// Note: This is an in-memory lock. It does not work across:

     

       79
       -
       /// - Multiple isolates

     

       80
       -
       /// - Multiple processes

     

       81
       -
       /// - Multiple app instances

     

       82
       -
       ///

     

       83
       -
       /// For cross-process locking, implement a platform-specific RuntimeLock.

     

       84
       -
       Future<T> requestLocalLock<T>(String name, FutureOr<T> Function() fn) async {

     

       85
       -
         // Acquire the lock and get the release function

     

       86
       -
         final release = await _acquireLocalLock(name);

     

       87
       -
       

     

       88
       -
         try {

     

       89
       -
           // Execute the function while holding the lock

     

       90
       -
           return await fn();

     

       91
       -
         } finally {

     

       92
       -
           // Always release the lock, even if the function throws

     

       93
       -
           release();

     

       94
       -
         }

     

       95
       -
       }

     

       96
       -
       

     

       97
       -
       /// Convenience getter that returns the requestLocalLock function as a RuntimeLock.

     

       98
       -
       ///

     

       99
       -
       /// This can be used as the default implementation for RuntimeImplementation.requestLock.

     

       100
       -
       RuntimeLock get requestLocalLockImpl => requestLocalLock;

-530

packages/atproto_oauth_flutter/pubspec.lock

···

       1
       -
       # Generated by pub

     

       2
       -
       # See https://dart.dev/tools/pub/glossary#lockfile

     

       3
       -
       packages:

     

       4
       -
         async:

     

       5
       -
           dependency: transitive

     

       6
       -
           description:

     

       7
       -
             name: async

     

       8
       -
             sha256: d2872f9c19731c2e5f10444b14686eb7cc85c76274bd6c16e1816bff9a3bab63

     

       9
       -
             url: "https://pub.dev"

     

       10
       -
           source: hosted

     

       11
       -
           version: "2.12.0"

     

       12
       -
         boolean_selector:

     

       13
       -
           dependency: transitive

     

       14
       -
           description:

     

       15
       -
             name: boolean_selector

     

       16
       -
             sha256: "8aab1771e1243a5063b8b0ff68042d67334e3feab9e95b9490f9a6ebf73b42ea"

     

       17
       -
             url: "https://pub.dev"

     

       18
       -
           source: hosted

     

       19
       -
           version: "2.1.2"

     

       20
       -
         characters:

     

       21
       -
           dependency: transitive

     

       22
       -
           description:

     

       23
       -
             name: characters

     

       24
       -
             sha256: f71061c654a3380576a52b451dd5532377954cf9dbd272a78fc8479606670803

     

       25
       -
             url: "https://pub.dev"

     

       26
       -
           source: hosted

     

       27
       -
           version: "1.4.0"

     

       28
       -
         clock:

     

       29
       -
           dependency: transitive

     

       30
       -
           description:

     

       31
       -
             name: clock

     

       32
       -
             sha256: fddb70d9b5277016c77a80201021d40a2247104d9f4aa7bab7157b7e3f05b84b

     

       33
       -
             url: "https://pub.dev"

     

       34
       -
           source: hosted

     

       35
       -
           version: "1.1.2"

     

       36
       -
         collection:

     

       37
       -
           dependency: "direct main"

     

       38
       -
           description:

     

       39
       -
             name: collection

     

       40
       -
             sha256: "2f5709ae4d3d59dd8f7cd309b4e023046b57d8a6c82130785d2b0e5868084e76"

     

       41
       -
             url: "https://pub.dev"

     

       42
       -
           source: hosted

     

       43
       -
           version: "1.19.1"

     

       44
       -
         convert:

     

       45
       -
           dependency: "direct main"

     

       46
       -
           description:

     

       47
       -
             name: convert

     

       48
       -
             sha256: b30acd5944035672bc15c6b7a8b47d773e41e2f17de064350988c5d02adb1c68

     

       49
       -
             url: "https://pub.dev"

     

       50
       -
           source: hosted

     

       51
       -
           version: "3.1.2"

     

       52
       -
         crypto:

     

       53
       -
           dependency: "direct main"

     

       54
       -
           description:

     

       55
       -
             name: crypto

     

       56
       -
             sha256: "1e445881f28f22d6140f181e07737b22f1e099a5e1ff94b0af2f9e4a463f4855"

     

       57
       -
             url: "https://pub.dev"

     

       58
       -
           source: hosted

     

       59
       -
           version: "3.0.6"

     

       60
       -
         desktop_webview_window:

     

       61
       -
           dependency: transitive

     

       62
       -
           description:

     

       63
       -
             name: desktop_webview_window

     

       64
       -
             sha256: "57cf20d81689d5cbb1adfd0017e96b669398a669d927906073b0e42fc64111c0"

     

       65
       -
             url: "https://pub.dev"

     

       66
       -
           source: hosted

     

       67
       -
           version: "0.2.3"

     

       68
       -
         dio:

     

       69
       -
           dependency: "direct main"

     

       70
       -
           description:

     

       71
       -
             name: dio

     

       72
       -
             sha256: d90ee57923d1828ac14e492ca49440f65477f4bb1263575900be731a3dac66a9

     

       73
       -
             url: "https://pub.dev"

     

       74
       -
           source: hosted

     

       75
       -
           version: "5.9.0"

     

       76
       -
         dio_web_adapter:

     

       77
       -
           dependency: transitive

     

       78
       -
           description:

     

       79
       -
             name: dio_web_adapter

     

       80
       -
             sha256: "7586e476d70caecaf1686d21eee7247ea43ef5c345eab9e0cc3583ff13378d78"

     

       81
       -
             url: "https://pub.dev"

     

       82
       -
           source: hosted

     

       83
       -
           version: "2.1.1"

     

       84
       -
         fake_async:

     

       85
       -
           dependency: transitive

     

       86
       -
           description:

     

       87
       -
             name: fake_async

     

       88
       -
             sha256: "5368f224a74523e8d2e7399ea1638b37aecfca824a3cc4dfdf77bf1fa905ac44"

     

       89
       -
             url: "https://pub.dev"

     

       90
       -
           source: hosted

     

       91
       -
           version: "1.3.3"

     

       92
       -
         ffi:

     

       93
       -
           dependency: transitive

     

       94
       -
           description:

     

       95
       -
             name: ffi

     

       96
       -
             sha256: "289279317b4b16eb2bb7e271abccd4bf84ec9bdcbe999e278a94b804f5630418"

     

       97
       -
             url: "https://pub.dev"

     

       98
       -
           source: hosted

     

       99
       -
           version: "2.1.4"

     

       100
       -
         flutter:

     

       101
       -
           dependency: "direct main"

     

       102
       -
           description: flutter

     

       103
       -
           source: sdk

     

       104
       -
           version: "0.0.0"

     

       105
       -
         flutter_lints:

     

       106
       -
           dependency: "direct dev"

     

       107
       -
           description:

     

       108
       -
             name: flutter_lints

     

       109
       -
             sha256: "5398f14efa795ffb7a33e9b6a08798b26a180edac4ad7db3f231e40f82ce11e1"

     

       110
       -
             url: "https://pub.dev"

     

       111
       -
           source: hosted

     

       112
       -
           version: "5.0.0"

     

       113
       -
         flutter_secure_storage:

     

       114
       -
           dependency: "direct main"

     

       115
       -
           description:

     

       116
       -
             name: flutter_secure_storage

     

       117
       -
             sha256: "9cad52d75ebc511adfae3d447d5d13da15a55a92c9410e50f67335b6d21d16ea"

     

       118
       -
             url: "https://pub.dev"

     

       119
       -
           source: hosted

     

       120
       -
           version: "9.2.4"

     

       121
       -
         flutter_secure_storage_linux:

     

       122
       -
           dependency: transitive

     

       123
       -
           description:

     

       124
       -
             name: flutter_secure_storage_linux

     

       125
       -
             sha256: be76c1d24a97d0b98f8b54bce6b481a380a6590df992d0098f868ad54dc8f688

     

       126
       -
             url: "https://pub.dev"

     

       127
       -
           source: hosted

     

       128
       -
           version: "1.2.3"

     

       129
       -
         flutter_secure_storage_macos:

     

       130
       -
           dependency: transitive

     

       131
       -
           description:

     

       132
       -
             name: flutter_secure_storage_macos

     

       133
       -
             sha256: "6c0a2795a2d1de26ae202a0d78527d163f4acbb11cde4c75c670f3a0fc064247"

     

       134
       -
             url: "https://pub.dev"

     

       135
       -
           source: hosted

     

       136
       -
           version: "3.1.3"

     

       137
       -
         flutter_secure_storage_platform_interface:

     

       138
       -
           dependency: transitive

     

       139
       -
           description:

     

       140
       -
             name: flutter_secure_storage_platform_interface

     

       141
       -
             sha256: cf91ad32ce5adef6fba4d736a542baca9daf3beac4db2d04be350b87f69ac4a8

     

       142
       -
             url: "https://pub.dev"

     

       143
       -
           source: hosted

     

       144
       -
           version: "1.1.2"

     

       145
       -
         flutter_secure_storage_web:

     

       146
       -
           dependency: transitive

     

       147
       -
           description:

     

       148
       -
             name: flutter_secure_storage_web

     

       149
       -
             sha256: f4ebff989b4f07b2656fb16b47852c0aab9fed9b4ec1c70103368337bc1886a9

     

       150
       -
             url: "https://pub.dev"

     

       151
       -
           source: hosted

     

       152
       -
           version: "1.2.1"

     

       153
       -
         flutter_secure_storage_windows:

     

       154
       -
           dependency: transitive

     

       155
       -
           description:

     

       156
       -
             name: flutter_secure_storage_windows

     

       157
       -
             sha256: b20b07cb5ed4ed74fc567b78a72936203f587eba460af1df11281c9326cd3709

     

       158
       -
             url: "https://pub.dev"

     

       159
       -
           source: hosted

     

       160
       -
           version: "3.1.2"

     

       161
       -
         flutter_test:

     

       162
       -
           dependency: "direct dev"

     

       163
       -
           description: flutter

     

       164
       -
           source: sdk

     

       165
       -
           version: "0.0.0"

     

       166
       -
         flutter_web_auth_2:

     

       167
       -
           dependency: "direct main"

     

       168
       -
           description:

     

       169
       -
             name: flutter_web_auth_2

     

       170
       -
             sha256: "3c14babeaa066c371f3a743f204dd0d348b7d42ffa6fae7a9847a521aff33696"

     

       171
       -
             url: "https://pub.dev"

     

       172
       -
           source: hosted

     

       173
       -
           version: "4.1.0"

     

       174
       -
         flutter_web_auth_2_platform_interface:

     

       175
       -
           dependency: transitive

     

       176
       -
           description:

     

       177
       -
             name: flutter_web_auth_2_platform_interface

     

       178
       -
             sha256: c63a472c8070998e4e422f6b34a17070e60782ac442107c70000dd1bed645f4d

     

       179
       -
             url: "https://pub.dev"

     

       180
       -
           source: hosted

     

       181
       -
           version: "4.1.0"

     

       182
       -
         flutter_web_plugins:

     

       183
       -
           dependency: transitive

     

       184
       -
           description: flutter

     

       185
       -
           source: sdk

     

       186
       -
           version: "0.0.0"

     

       187
       -
         http:

     

       188
       -
           dependency: "direct main"

     

       189
       -
           description:

     

       190
       -
             name: http

     

       191
       -
             sha256: bb2ce4590bc2667c96f318d68cac1b5a7987ec819351d32b1c987239a815e007

     

       192
       -
             url: "https://pub.dev"

     

       193
       -
           source: hosted

     

       194
       -
           version: "1.5.0"

     

       195
       -
         http_parser:

     

       196
       -
           dependency: transitive

     

       197
       -
           description:

     

       198
       -
             name: http_parser

     

       199
       -
             sha256: "178d74305e7866013777bab2c3d8726205dc5a4dd935297175b19a23a2e66571"

     

       200
       -
             url: "https://pub.dev"

     

       201
       -
           source: hosted

     

       202
       -
           version: "4.1.2"

     

       203
       -
         js:

     

       204
       -
           dependency: transitive

     

       205
       -
           description:

     

       206
       -
             name: js

     

       207
       -
             sha256: f2c445dce49627136094980615a031419f7f3eb393237e4ecd97ac15dea343f3

     

       208
       -
             url: "https://pub.dev"

     

       209
       -
           source: hosted

     

       210
       -
           version: "0.6.7"

     

       211
       -
         leak_tracker:

     

       212
       -
           dependency: transitive

     

       213
       -
           description:

     

       214
       -
             name: leak_tracker

     

       215
       -
             sha256: "33e2e26bdd85a0112ec15400c8cbffea70d0f9c3407491f672a2fad47915e2de"

     

       216
       -
             url: "https://pub.dev"

     

       217
       -
           source: hosted

     

       218
       -
           version: "11.0.2"

     

       219
       -
         leak_tracker_flutter_testing:

     

       220
       -
           dependency: transitive

     

       221
       -
           description:

     

       222
       -
             name: leak_tracker_flutter_testing

     

       223
       -
             sha256: "1dbc140bb5a23c75ea9c4811222756104fbcd1a27173f0c34ca01e16bea473c1"

     

       224
       -
             url: "https://pub.dev"

     

       225
       -
           source: hosted

     

       226
       -
           version: "3.0.10"

     

       227
       -
         leak_tracker_testing:

     

       228
       -
           dependency: transitive

     

       229
       -
           description:

     

       230
       -
             name: leak_tracker_testing

     

       231
       -
             sha256: "8d5a2d49f4a66b49744b23b018848400d23e54caf9463f4eb20df3eb8acb2eb1"

     

       232
       -
             url: "https://pub.dev"

     

       233
       -
           source: hosted

     

       234
       -
           version: "3.0.2"

     

       235
       -
         lints:

     

       236
       -
           dependency: transitive

     

       237
       -
           description:

     

       238
       -
             name: lints

     

       239
       -
             sha256: c35bb79562d980e9a453fc715854e1ed39e24e7d0297a880ef54e17f9874a9d7

     

       240
       -
             url: "https://pub.dev"

     

       241
       -
           source: hosted

     

       242
       -
           version: "5.1.1"

     

       243
       -
         matcher:

     

       244
       -
           dependency: transitive

     

       245
       -
           description:

     

       246
       -
             name: matcher

     

       247
       -
             sha256: dc58c723c3c24bf8d3e2d3ad3f2f9d7bd9cf43ec6feaa64181775e60190153f2

     

       248
       -
             url: "https://pub.dev"

     

       249
       -
           source: hosted

     

       250
       -
           version: "0.12.17"

     

       251
       -
         material_color_utilities:

     

       252
       -
           dependency: transitive

     

       253
       -
           description:

     

       254
       -
             name: material_color_utilities

     

       255
       -
             sha256: f7142bb1154231d7ea5f96bc7bde4bda2a0945d2806bb11670e30b850d56bdec

     

       256
       -
             url: "https://pub.dev"

     

       257
       -
           source: hosted

     

       258
       -
           version: "0.11.1"

     

       259
       -
         meta:

     

       260
       -
           dependency: transitive

     

       261
       -
           description:

     

       262
       -
             name: meta

     

       263
       -
             sha256: e3641ec5d63ebf0d9b41bd43201a66e3fc79a65db5f61fc181f04cd27aab950c

     

       264
       -
             url: "https://pub.dev"

     

       265
       -
           source: hosted

     

       266
       -
           version: "1.16.0"

     

       267
       -
         mime:

     

       268
       -
           dependency: transitive

     

       269
       -
           description:

     

       270
       -
             name: mime

     

       271
       -
             sha256: "41a20518f0cb1256669420fdba0cd90d21561e560ac240f26ef8322e45bb7ed6"

     

       272
       -
             url: "https://pub.dev"

     

       273
       -
           source: hosted

     

       274
       -
           version: "2.0.0"

     

       275
       -
         path:

     

       276
       -
           dependency: transitive

     

       277
       -
           description:

     

       278
       -
             name: path

     

       279
       -
             sha256: "75cca69d1490965be98c73ceaea117e8a04dd21217b37b292c9ddbec0d955bc5"

     

       280
       -
             url: "https://pub.dev"

     

       281
       -
           source: hosted

     

       282
       -
           version: "1.9.1"

     

       283
       -
         path_provider:

     

       284
       -
           dependency: transitive

     

       285
       -
           description:

     

       286
       -
             name: path_provider

     

       287
       -
             sha256: "50c5dd5b6e1aaf6fb3a78b33f6aa3afca52bf903a8a5298f53101fdaee55bbcd"

     

       288
       -
             url: "https://pub.dev"

     

       289
       -
           source: hosted

     

       290
       -
           version: "2.1.5"

     

       291
       -
         path_provider_android:

     

       292
       -
           dependency: transitive

     

       293
       -
           description:

     

       294
       -
             name: path_provider_android

     

       295
       -
             sha256: "3b4c1fc3aa55ddc9cd4aa6759984330d5c8e66aa7702a6223c61540dc6380c37"

     

       296
       -
             url: "https://pub.dev"

     

       297
       -
           source: hosted

     

       298
       -
           version: "2.2.19"

     

       299
       -
         path_provider_foundation:

     

       300
       -
           dependency: transitive

     

       301
       -
           description:

     

       302
       -
             name: path_provider_foundation

     

       303
       -
             sha256: "16eef174aacb07e09c351502740fa6254c165757638eba1e9116b0a781201bbd"

     

       304
       -
             url: "https://pub.dev"

     

       305
       -
           source: hosted

     

       306
       -
           version: "2.4.2"

     

       307
       -
         path_provider_linux:

     

       308
       -
           dependency: transitive

     

       309
       -
           description:

     

       310
       -
             name: path_provider_linux

     

       311
       -
             sha256: f7a1fe3a634fe7734c8d3f2766ad746ae2a2884abe22e241a8b301bf5cac3279

     

       312
       -
             url: "https://pub.dev"

     

       313
       -
           source: hosted

     

       314
       -
           version: "2.2.1"

     

       315
       -
         path_provider_platform_interface:

     

       316
       -
           dependency: transitive

     

       317
       -
           description:

     

       318
       -
             name: path_provider_platform_interface

     

       319
       -
             sha256: "88f5779f72ba699763fa3a3b06aa4bf6de76c8e5de842cf6f29e2e06476c2334"

     

       320
       -
             url: "https://pub.dev"

     

       321
       -
           source: hosted

     

       322
       -
           version: "2.1.2"

     

       323
       -
         path_provider_windows:

     

       324
       -
           dependency: transitive

     

       325
       -
           description:

     

       326
       -
             name: path_provider_windows

     

       327
       -
             sha256: bd6f00dbd873bfb70d0761682da2b3a2c2fccc2b9e84c495821639601d81afe7

     

       328
       -
             url: "https://pub.dev"

     

       329
       -
           source: hosted

     

       330
       -
           version: "2.3.0"

     

       331
       -
         platform:

     

       332
       -
           dependency: transitive

     

       333
       -
           description:

     

       334
       -
             name: platform

     

       335
       -
             sha256: "5d6b1b0036a5f331ebc77c850ebc8506cbc1e9416c27e59b439f917a902a4984"

     

       336
       -
             url: "https://pub.dev"

     

       337
       -
           source: hosted

     

       338
       -
           version: "3.1.6"

     

       339
       -
         plugin_platform_interface:

     

       340
       -
           dependency: transitive

     

       341
       -
           description:

     

       342
       -
             name: plugin_platform_interface

     

       343
       -
             sha256: "4820fbfdb9478b1ebae27888254d445073732dae3d6ea81f0b7e06d5dedc3f02"

     

       344
       -
             url: "https://pub.dev"

     

       345
       -
           source: hosted

     

       346
       -
           version: "2.1.8"

     

       347
       -
         pointycastle:

     

       348
       -
           dependency: "direct main"

     

       349
       -
           description:

     

       350
       -
             name: pointycastle

     

       351
       -
             sha256: "4be0097fcf3fd3e8449e53730c631200ebc7b88016acecab2b0da2f0149222fe"

     

       352
       -
             url: "https://pub.dev"

     

       353
       -
           source: hosted

     

       354
       -
           version: "3.9.1"

     

       355
       -
         sky_engine:

     

       356
       -
           dependency: transitive

     

       357
       -
           description: flutter

     

       358
       -
           source: sdk

     

       359
       -
           version: "0.0.0"

     

       360
       -
         source_span:

     

       361
       -
           dependency: transitive

     

       362
       -
           description:

     

       363
       -
             name: source_span

     

       364
       -
             sha256: "254ee5351d6cb365c859e20ee823c3bb479bf4a293c22d17a9f1bf144ce86f7c"

     

       365
       -
             url: "https://pub.dev"

     

       366
       -
           source: hosted

     

       367
       -
           version: "1.10.1"

     

       368
       -
         stack_trace:

     

       369
       -
           dependency: transitive

     

       370
       -
           description:

     

       371
       -
             name: stack_trace

     

       372
       -
             sha256: "8b27215b45d22309b5cddda1aa2b19bdfec9df0e765f2de506401c071d38d1b1"

     

       373
       -
             url: "https://pub.dev"

     

       374
       -
           source: hosted

     

       375
       -
           version: "1.12.1"

     

       376
       -
         stream_channel:

     

       377
       -
           dependency: transitive

     

       378
       -
           description:

     

       379
       -
             name: stream_channel

     

       380
       -
             sha256: "969e04c80b8bcdf826f8f16579c7b14d780458bd97f56d107d3950fdbeef059d"

     

       381
       -
             url: "https://pub.dev"

     

       382
       -
           source: hosted

     

       383
       -
           version: "2.1.4"

     

       384
       -
         string_scanner:

     

       385
       -
           dependency: transitive

     

       386
       -
           description:

     

       387
       -
             name: string_scanner

     

       388
       -
             sha256: "921cd31725b72fe181906c6a94d987c78e3b98c2e205b397ea399d4054872b43"

     

       389
       -
             url: "https://pub.dev"

     

       390
       -
           source: hosted

     

       391
       -
           version: "1.4.1"

     

       392
       -
         term_glyph:

     

       393
       -
           dependency: transitive

     

       394
       -
           description:

     

       395
       -
             name: term_glyph

     

       396
       -
             sha256: "7f554798625ea768a7518313e58f83891c7f5024f88e46e7182a4558850a4b8e"

     

       397
       -
             url: "https://pub.dev"

     

       398
       -
           source: hosted

     

       399
       -
           version: "1.2.2"

     

       400
       -
         test_api:

     

       401
       -
           dependency: transitive

     

       402
       -
           description:

     

       403
       -
             name: test_api

     

       404
       -
             sha256: "522f00f556e73044315fa4585ec3270f1808a4b186c936e612cab0b565ff1e00"

     

       405
       -
             url: "https://pub.dev"

     

       406
       -
           source: hosted

     

       407
       -
           version: "0.7.6"

     

       408
       -
         typed_data:

     

       409
       -
           dependency: transitive

     

       410
       -
           description:

     

       411
       -
             name: typed_data

     

       412
       -
             sha256: f9049c039ebfeb4cf7a7104a675823cd72dba8297f264b6637062516699fa006

     

       413
       -
             url: "https://pub.dev"

     

       414
       -
           source: hosted

     

       415
       -
           version: "1.4.0"

     

       416
       -
         url_launcher:

     

       417
       -
           dependency: transitive

     

       418
       -
           description:

     

       419
       -
             name: url_launcher

     

       420
       -
             sha256: f6a7e5c4835bb4e3026a04793a4199ca2d14c739ec378fdfe23fc8075d0439f8

     

       421
       -
             url: "https://pub.dev"

     

       422
       -
           source: hosted

     

       423
       -
           version: "6.3.2"

     

       424
       -
         url_launcher_android:

     

       425
       -
           dependency: transitive

     

       426
       -
           description:

     

       427
       -
             name: url_launcher_android

     

       428
       -
             sha256: "81777b08c498a292d93ff2feead633174c386291e35612f8da438d6e92c4447e"

     

       429
       -
             url: "https://pub.dev"

     

       430
       -
           source: hosted

     

       431
       -
           version: "6.3.20"

     

       432
       -
         url_launcher_ios:

     

       433
       -
           dependency: transitive

     

       434
       -
           description:

     

       435
       -
             name: url_launcher_ios

     

       436
       -
             sha256: d80b3f567a617cb923546034cc94bfe44eb15f989fe670b37f26abdb9d939cb7

     

       437
       -
             url: "https://pub.dev"

     

       438
       -
           source: hosted

     

       439
       -
           version: "6.3.4"

     

       440
       -
         url_launcher_linux:

     

       441
       -
           dependency: transitive

     

       442
       -
           description:

     

       443
       -
             name: url_launcher_linux

     

       444
       -
             sha256: "4e9ba368772369e3e08f231d2301b4ef72b9ff87c31192ef471b380ef29a4935"

     

       445
       -
             url: "https://pub.dev"

     

       446
       -
           source: hosted

     

       447
       -
           version: "3.2.1"

     

       448
       -
         url_launcher_macos:

     

       449
       -
           dependency: transitive

     

       450
       -
           description:

     

       451
       -
             name: url_launcher_macos

     

       452
       -
             sha256: c043a77d6600ac9c38300567f33ef12b0ef4f4783a2c1f00231d2b1941fea13f

     

       453
       -
             url: "https://pub.dev"

     

       454
       -
           source: hosted

     

       455
       -
           version: "3.2.3"

     

       456
       -
         url_launcher_platform_interface:

     

       457
       -
           dependency: transitive

     

       458
       -
           description:

     

       459
       -
             name: url_launcher_platform_interface

     

       460
       -
             sha256: "552f8a1e663569be95a8190206a38187b531910283c3e982193e4f2733f01029"

     

       461
       -
             url: "https://pub.dev"

     

       462
       -
           source: hosted

     

       463
       -
           version: "2.3.2"

     

       464
       -
         url_launcher_web:

     

       465
       -
           dependency: transitive

     

       466
       -
           description:

     

       467
       -
             name: url_launcher_web

     

       468
       -
             sha256: "4bd2b7b4dc4d4d0b94e5babfffbca8eac1a126c7f3d6ecbc1a11013faa3abba2"

     

       469
       -
             url: "https://pub.dev"

     

       470
       -
           source: hosted

     

       471
       -
           version: "2.4.1"

     

       472
       -
         url_launcher_windows:

     

       473
       -
           dependency: transitive

     

       474
       -
           description:

     

       475
       -
             name: url_launcher_windows

     

       476
       -
             sha256: "3284b6d2ac454cf34f114e1d3319866fdd1e19cdc329999057e44ffe936cfa77"

     

       477
       -
             url: "https://pub.dev"

     

       478
       -
           source: hosted

     

       479
       -
           version: "3.1.4"

     

       480
       -
         vector_math:

     

       481
       -
           dependency: transitive

     

       482
       -
           description:

     

       483
       -
             name: vector_math

     

       484
       -
             sha256: d530bd74fea330e6e364cda7a85019c434070188383e1cd8d9777ee586914c5b

     

       485
       -
             url: "https://pub.dev"

     

       486
       -
           source: hosted

     

       487
       -
           version: "2.2.0"

     

       488
       -
         vm_service:

     

       489
       -
           dependency: transitive

     

       490
       -
           description:

     

       491
       -
             name: vm_service

     

       492
       -
             sha256: "0968250880a6c5fe7edc067ed0a13d4bae1577fe2771dcf3010d52c4a9d3ca14"

     

       493
       -
             url: "https://pub.dev"

     

       494
       -
           source: hosted

     

       495
       -
           version: "14.3.1"

     

       496
       -
         web:

     

       497
       -
           dependency: transitive

     

       498
       -
           description:

     

       499
       -
             name: web

     

       500
       -
             sha256: "868d88a33d8a87b18ffc05f9f030ba328ffefba92d6c127917a2ba740f9cfe4a"

     

       501
       -
             url: "https://pub.dev"

     

       502
       -
           source: hosted

     

       503
       -
           version: "1.1.1"

     

       504
       -
         win32:

     

       505
       -
           dependency: transitive

     

       506
       -
           description:

     

       507
       -
             name: win32

     

       508
       -
             sha256: "329edf97fdd893e0f1e3b9e88d6a0e627128cc17cc316a8d67fda8f1451178ba"

     

       509
       -
             url: "https://pub.dev"

     

       510
       -
           source: hosted

     

       511
       -
           version: "5.13.0"

     

       512
       -
         window_to_front:

     

       513
       -
           dependency: transitive

     

       514
       -
           description:

     

       515
       -
             name: window_to_front

     

       516
       -
             sha256: "7aef379752b7190c10479e12b5fd7c0b9d92adc96817d9e96c59937929512aee"

     

       517
       -
             url: "https://pub.dev"

     

       518
       -
           source: hosted

     

       519
       -
           version: "0.0.3"

     

       520
       -
         xdg_directories:

     

       521
       -
           dependency: transitive

     

       522
       -
           description:

     

       523
       -
             name: xdg_directories

     

       524
       -
             sha256: "7a3f37b05d989967cdddcbb571f1ea834867ae2faa29725fd085180e0883aa15"

     

       525
       -
             url: "https://pub.dev"

     

       526
       -
           source: hosted

     

       527
       -
           version: "1.1.0"

     

       528
       -
       sdks:

     

       529
       -
         dart: ">=3.8.0-0 <4.0.0"

     

       530
       -
         flutter: ">=3.29.0"

-24

packages/atproto_oauth_flutter/pubspec.yaml

···

       1
       -
       name: atproto_oauth_flutter

     

       2
       -
       description: Official AT Protocol OAuth client for Flutter - 1:1 port of @atproto/oauth-client

     

       3
       -
       version: 0.1.0

     

       4
       -
       publish_to: none

     

       5
       -
       

     

       6
       -
       environment:

     

       7
       -
         sdk: ^3.7.2

     

       8
       -
       

     

       9
       -
       dependencies:

     

       10
       -
         flutter:

     

       11
       -
           sdk: flutter

     

       12
       -
         dio: ^5.9.0

     

       13
       -
         flutter_secure_storage: ^9.2.2

     

       14
       -
         flutter_web_auth_2: ^4.1.0

     

       15
       -
         crypto: ^3.0.3

     

       16
       -
         pointycastle: ^3.9.1

     

       17
       -
         convert: ^3.1.1

     

       18
       -
         collection: ^1.18.0

     

       19
       -
         http: ^1.2.0

     

       20
       -
       

     

       21
       -
       dev_dependencies:

     

       22
       -
         flutter_test:

     

       23
       -
           sdk: flutter

     

       24
       -
         flutter_lints: ^5.0.0

-245

packages/atproto_oauth_flutter/test/identity_resolver_test.dart

···

       1
       -
       /// Unit tests for the identity resolution layer.

     

       2
       -
       ///

     

       3
       -
       /// Note: These are basic validation tests. Real integration tests would

     

       4
       -
       /// require network calls to live services.

     

       5
       -
       

     

       6
       -
       import 'package:flutter_test/flutter_test.dart';

     

       7
       -
       import 'package:atproto_oauth_flutter/src/identity/identity.dart';

     

       8
       -
       

     

       9
       -
       void main() {

     

       10
       -
         group('DID Validation', () {

     

       11
       -
           test('isDidPlc validates did:plc correctly', () {

     

       12
       -
             // did:plc must be exactly 32 chars total (8 prefix + 24 base32 [a-z2-7])

     

       13
       -
             expect(isDidPlc('did:plc:z72i7hdynmk6r22z27h6abc2'), isTrue);

     

       14
       -
             expect(isDidPlc('did:plc:2222222222222222222222ab'), isTrue);

     

       15
       -
             expect(isDidPlc('did:plc:abcdefgabcdefgabcdefgabc'), isTrue);

     

       16
       -
       

     

       17
       -
             // Wrong length

     

       18
       -
             expect(isDidPlc('did:plc:short'), isFalse);

     

       19
       -
             expect(isDidPlc('did:plc:toolonggggggggggggggggggggg'), isFalse);

     

       20
       -
       

     

       21
       -
             // Wrong prefix

     

       22
       -
             expect(isDidPlc('did:web:example.com'), isFalse);

     

       23
       -
       

     

       24
       -
             // Invalid characters (not base32)

     

       25
       -
             expect(isDidPlc('did:plc:0000000000000000000000'), isFalse); // has 0

     

       26
       -
             expect(isDidPlc('did:plc:1111111111111111111111'), isFalse); // has 1

     

       27
       -
           });

     

       28
       -
       

     

       29
       -
           test('isDidWeb validates did:web correctly', () {

     

       30
       -
             expect(isDidWeb('did:web:example.com'), isTrue);

     

       31
       -
             expect(isDidWeb('did:web:example.com:user:alice'), isTrue);

     

       32
       -
             expect(isDidWeb('did:web:localhost%3A3000'), isTrue);

     

       33
       -
       

     

       34
       -
             // Wrong prefix

     

       35
       -
             expect(isDidWeb('did:plc:abc123xyz789abc123xyz789'), isFalse);

     

       36
       -
       

     

       37
       -
             // Can't start with colon after prefix

     

       38
       -
             expect(isDidWeb('did:web::example.com'), isFalse);

     

       39
       -
           });

     

       40
       -
       

     

       41
       -
           test('isDid validates general DIDs', () {

     

       42
       -
             expect(isDid('did:plc:abc123xyz789abc123xyz789'), isTrue);

     

       43
       -
             expect(isDid('did:web:example.com'), isTrue);

     

       44
       -
             expect(

     

       45
       -
               isDid('did:key:z6MkhaXgBZDvotDkL5257faiztiGiC2QtKLGpbnnEGta2doK'),

     

       46
       -
               isTrue,

     

       47
       -
             );

     

       48
       -
       

     

       49
       -
             // Invalid

     

       50
       -
             expect(isDid('not-a-did'), isFalse);

     

       51
       -
             expect(isDid('did:'), isFalse);

     

       52
       -
             expect(isDid('did:method'), isFalse);

     

       53
       -
             expect(isDid(''), isFalse);

     

       54
       -
           });

     

       55
       -
       

     

       56
       -
           test('extractDidMethod extracts method name', () {

     

       57
       -
             expect(extractDidMethod('did:plc:abc123'), equals('plc'));

     

       58
       -
             expect(extractDidMethod('did:web:example.com'), equals('web'));

     

       59
       -
             expect(extractDidMethod('did:key:z6Mk...'), equals('key'));

     

       60
       -
           });

     

       61
       -
       

     

       62
       -
           test('didWebToUrl converts did:web to URL', () {

     

       63
       -
             final url1 = didWebToUrl('did:web:example.com');

     

       64
       -
             expect(url1.toString(), equals('https://example.com'));

     

       65
       -
       

     

       66
       -
             final url2 = didWebToUrl('did:web:example.com:user:alice');

     

       67
       -
             expect(url2.toString(), equals('https://example.com/user/alice'));

     

       68
       -
       

     

       69
       -
             final url3 = didWebToUrl('did:web:localhost%3A3000');

     

       70
       -
             expect(url3.toString(), equals('http://localhost:3000'));

     

       71
       -
           });

     

       72
       -
       

     

       73
       -
           test('urlToDidWeb converts URL to did:web', () {

     

       74
       -
             final did1 = urlToDidWeb(Uri.parse('https://example.com'));

     

       75
       -
             expect(did1, equals('did:web:example.com'));

     

       76
       -
       

     

       77
       -
             final did2 = urlToDidWeb(Uri.parse('https://example.com/user/alice'));

     

       78
       -
             expect(did2, equals('did:web:example.com:user:alice'));

     

       79
       -
           });

     

       80
       -
         });

     

       81
       -
       

     

       82
       -
         group('Handle Validation', () {

     

       83
       -
           test('isValidHandle validates handles', () {

     

       84
       -
             expect(isValidHandle('alice.example.com'), isTrue);

     

       85
       -
             expect(isValidHandle('user.bsky.social'), isTrue);

     

       86
       -
             expect(isValidHandle('sub.domain.example.com'), isTrue);

     

       87
       -
             expect(isValidHandle('a.b'), isTrue);

     

       88
       -
       

     

       89
       -
             // Invalid

     

       90
       -
             expect(isValidHandle(''), isFalse);

     

       91
       -
             expect(isValidHandle('no-tld'), isFalse);

     

       92
       -
             expect(isValidHandle('.starts-with-dot.com'), isFalse);

     

       93
       -
             expect(isValidHandle('ends-with-dot.com.'), isFalse);

     

       94
       -
             expect(isValidHandle('has..double-dot.com'), isFalse);

     

       95
       -
             expect(isValidHandle('has spaces.com'), isFalse);

     

       96
       -
       

     

       97
       -
             // Too long (254+ chars)

     

       98
       -
             final longHandle = '${'a' * 250}.com';

     

       99
       -
             expect(isValidHandle(longHandle), isFalse);

     

       100
       -
           });

     

       101
       -
       

     

       102
       -
           test('normalizeHandle converts to lowercase', () {

     

       103
       -
             expect(normalizeHandle('Alice.Example.Com'), equals('alice.example.com'));

     

       104
       -
             expect(normalizeHandle('USER.BSKY.SOCIAL'), equals('user.bsky.social'));

     

       105
       -
           });

     

       106
       -
       

     

       107
       -
           test('asNormalizedHandle validates and normalizes', () {

     

       108
       -
             expect(

     

       109
       -
               asNormalizedHandle('Alice.Example.Com'),

     

       110
       -
               equals('alice.example.com'),

     

       111
       -
             );

     

       112
       -
             expect(asNormalizedHandle('invalid'), isNull);

     

       113
       -
             expect(asNormalizedHandle(''), isNull);

     

       114
       -
           });

     

       115
       -
         });

     

       116
       -
       

     

       117
       -
         group('DID Document', () {

     

       118
       -
           test('DidDocument parses from JSON', () {

     

       119
       -
             final json = {

     

       120
       -
               'id': 'did:plc:abc123xyz789abc123xyz789',

     

       121
       -
               'alsoKnownAs': ['at://alice.bsky.social'],

     

       122
       -
               'service': [

     

       123
       -
                 {

     

       124
       -
                   'id': '#atproto_pds',

     

       125
       -
                   'type': 'AtprotoPersonalDataServer',

     

       126
       -
                   'serviceEndpoint': 'https://pds.example.com',

     

       127
       -
                 },

     

       128
       -
               ],

     

       129
       -
             };

     

       130
       -
       

     

       131
       -
             final doc = DidDocument.fromJson(json);

     

       132
       -
       

     

       133
       -
             expect(doc.id, equals('did:plc:abc123xyz789abc123xyz789'));

     

       134
       -
             expect(doc.alsoKnownAs, contains('at://alice.bsky.social'));

     

       135
       -
             expect(doc.service?.length, equals(1));

     

       136
       -
             expect(doc.service?[0].type, equals('AtprotoPersonalDataServer'));

     

       137
       -
           });

     

       138
       -
       

     

       139
       -
           test('DidDocument extracts PDS URL', () {

     

       140
       -
             final doc = DidDocument(

     

       141
       -
               id: 'did:plc:test',

     

       142
       -
               service: [

     

       143
       -
                 DidService(

     

       144
       -
                   id: '#atproto_pds',

     

       145
       -
                   type: 'AtprotoPersonalDataServer',

     

       146
       -
                   serviceEndpoint: 'https://pds.example.com',

     

       147
       -
                 ),

     

       148
       -
               ],

     

       149
       -
             );

     

       150
       -
       

     

       151
       -
             expect(doc.extractPdsUrl(), equals('https://pds.example.com'));

     

       152
       -
           });

     

       153
       -
       

     

       154
       -
           test('DidDocument extracts handle', () {

     

       155
       -
             final doc = DidDocument(

     

       156
       -
               id: 'did:plc:test',

     

       157
       -
               alsoKnownAs: ['at://alice.bsky.social', 'https://example.com'],

     

       158
       -
             );

     

       159
       -
       

     

       160
       -
             expect(doc.extractAtprotoHandle(), equals('alice.bsky.social'));

     

       161
       -
             expect(doc.extractNormalizedHandle(), equals('alice.bsky.social'));

     

       162
       -
           });

     

       163
       -
       

     

       164
       -
           test('DidDocument returns null for missing PDS', () {

     

       165
       -
             final doc = DidDocument(id: 'did:plc:test');

     

       166
       -
             expect(doc.extractPdsUrl(), isNull);

     

       167
       -
           });

     

       168
       -
       

     

       169
       -
           test('DidDocument returns null for missing handle', () {

     

       170
       -
             final doc = DidDocument(id: 'did:plc:test');

     

       171
       -
             expect(doc.extractAtprotoHandle(), isNull);

     

       172
       -
             expect(doc.extractNormalizedHandle(), isNull);

     

       173
       -
           });

     

       174
       -
         });

     

       175
       -
       

     

       176
       -
         group('Cache', () {

     

       177
       -
           test('InMemoryDidCache stores and retrieves', () async {

     

       178
       -
             final cache = InMemoryDidCache(ttl: Duration(seconds: 1));

     

       179
       -
             final doc = DidDocument(id: 'did:plc:test');

     

       180
       -
       

     

       181
       -
             await cache.set('did:plc:test', doc);

     

       182
       -
             final retrieved = await cache.get('did:plc:test');

     

       183
       -
       

     

       184
       -
             expect(retrieved?.id, equals('did:plc:test'));

     

       185
       -
           });

     

       186
       -
       

     

       187
       -
           test('InMemoryDidCache expires entries', () async {

     

       188
       -
             final cache = InMemoryDidCache(ttl: Duration(milliseconds: 100));

     

       189
       -
             final doc = DidDocument(id: 'did:plc:test');

     

       190
       -
       

     

       191
       -
             await cache.set('did:plc:test', doc);

     

       192
       -
       

     

       193
       -
             // Should exist immediately

     

       194
       -
             expect(await cache.get('did:plc:test'), isNotNull);

     

       195
       -
       

     

       196
       -
             // Wait for expiration

     

       197
       -
             await Future.delayed(Duration(milliseconds: 150));

     

       198
       -
       

     

       199
       -
             // Should be expired

     

       200
       -
             expect(await cache.get('did:plc:test'), isNull);

     

       201
       -
           });

     

       202
       -
       

     

       203
       -
           test('InMemoryHandleCache stores and retrieves', () async {

     

       204
       -
             final cache = InMemoryHandleCache(ttl: Duration(seconds: 1));

     

       205
       -
       

     

       206
       -
             await cache.set('alice.bsky.social', 'did:plc:test');

     

       207
       -
             final retrieved = await cache.get('alice.bsky.social');

     

       208
       -
       

     

       209
       -
             expect(retrieved, equals('did:plc:test'));

     

       210
       -
           });

     

       211
       -
       

     

       212
       -
           test('Cache clears all entries', () async {

     

       213
       -
             final cache = InMemoryDidCache();

     

       214
       -
             final doc = DidDocument(id: 'did:plc:test');

     

       215
       -
       

     

       216
       -
             await cache.set('did:plc:test', doc);

     

       217
       -
             expect(await cache.get('did:plc:test'), isNotNull);

     

       218
       -
       

     

       219
       -
             await cache.clear();

     

       220
       -
             expect(await cache.get('did:plc:test'), isNull);

     

       221
       -
           });

     

       222
       -
         });

     

       223
       -
       

     

       224
       -
         group('Error Types', () {

     

       225
       -
           test('IdentityResolverError has message', () {

     

       226
       -
             final error = IdentityResolverError('Test error');

     

       227
       -
             expect(error.message, equals('Test error'));

     

       228
       -
             expect(error.toString(), contains('Test error'));

     

       229
       -
           });

     

       230
       -
       

     

       231
       -
           test('InvalidDidError includes DID', () {

     

       232
       -
             final error = InvalidDidError('not:valid', 'Invalid format');

     

       233
       -
             expect(error.did, equals('not:valid'));

     

       234
       -
             expect(error.toString(), contains('not:valid'));

     

       235
       -
             expect(error.toString(), contains('Invalid format'));

     

       236
       -
           });

     

       237
       -
       

     

       238
       -
           test('InvalidHandleError includes handle', () {

     

       239
       -
             final error = InvalidHandleError('invalid', 'Invalid format');

     

       240
       -
             expect(error.handle, equals('invalid'));

     

       241
       -
             expect(error.toString(), contains('invalid'));

     

       242
       -
             expect(error.toString(), contains('Invalid format'));

     

       243
       -
           });

     

       244
       -
         });

     

       245
       -
       }