commit fa12c7b12b33a5a0c06f9fb2dd801a3ca9ad0c92 · bretton.dev/coves

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internal/api/handlers/wellknown/universal_links.go

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       package wellknown

     

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       import (

     

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       	"encoding/json"

     

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       	"log/slog"

     

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       	"net/http"

     

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       	"os"

     

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       )

     

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       // HandleAppleAppSiteAssociation serves the iOS Universal Links configuration

     

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       // GET /.well-known/apple-app-site-association

     

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       //

     

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       // Universal Links provide cryptographic binding between the app and domain:

     

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       // - Requires apple-app-site-association file served over HTTPS

     

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       // - App must have Associated Domains capability configured

     

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       // - System verifies domain ownership before routing deep links

     

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       // - Prevents malicious apps from intercepting deep links

     

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       //

     

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       // Spec: https://developer.apple.com/documentation/xcode/supporting-universal-links-in-your-app

     

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       func HandleAppleAppSiteAssociation(w http.ResponseWriter, r *http.Request) {

     

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       	// Get Apple App ID from environment (format: <Team ID>.<Bundle ID>)

     

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       	// Example: "ABCD1234.social.coves.app"

     

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       	// Find Team ID in Apple Developer Portal -> Membership

     

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       	// Bundle ID is configured in Xcode project

     

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       	appleAppID := os.Getenv("APPLE_APP_ID")

     

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       	if appleAppID == "" {

     

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       		// Development fallback - allows testing without real Team ID

     

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       		// IMPORTANT: This MUST be set in production for Universal Links to work

     

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       		appleAppID = "DEVELOPMENT.social.coves.app"

     

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       		slog.Warn("APPLE_APP_ID not set, using development placeholder",

     

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       			"app_id", appleAppID,

     

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       			"note", "Set APPLE_APP_ID env var for production Universal Links")

     

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       	}

     

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       	// Apple requires application/json content type (no charset)

     

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       	w.Header().Set("Content-Type", "application/json")

     

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       	// Construct the response per Apple's spec

     

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       	// See: https://developer.apple.com/documentation/bundleresources/applinks

     

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       	response := map[string]interface{}{

     

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       		"applinks": map[string]interface{}{

     

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       			"apps": []string{}, // Must be empty array per Apple spec

     

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       			"details": []map[string]interface{}{

     

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       				{

     

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       					"appID": appleAppID,

     

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       					// Paths that trigger Universal Links when opened in Safari/other apps

     

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       					// These URLs will open the app instead of the browser

     

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       					"paths": []string{

     

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       						"/app/oauth/callback",   // Primary Universal Link OAuth callback

     

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       						"/app/oauth/callback/*", // Catch-all for query params

     

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       					},

     

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       				},

     

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       			},

     

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       		},

     

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       	}

     

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       	if err := json.NewEncoder(w).Encode(response); err != nil {

     

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       		slog.Error("failed to encode apple-app-site-association", "error", err)

     

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       		http.Error(w, "internal server error", http.StatusInternalServerError)

     

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       		return

     

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       	}

     

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       	slog.Debug("served apple-app-site-association", "app_id", appleAppID)

     

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       }

     

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       // HandleAssetLinks serves the Android App Links configuration

     

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       // GET /.well-known/assetlinks.json

     

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       //

     

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       // App Links provide cryptographic binding between the app and domain:

     

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       // - Requires assetlinks.json file served over HTTPS

     

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       // - App must have intent-filter with android:autoVerify="true"

     

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       // - System verifies domain ownership via SHA-256 certificate fingerprint

     

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       // - Prevents malicious apps from intercepting deep links

     

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       //

     

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       // Spec: https://developer.android.com/training/app-links/verify-android-applinks

     

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       func HandleAssetLinks(w http.ResponseWriter, r *http.Request) {

     

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       	// Get Android package name from environment

     

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       	// Example: "social.coves.app"

     

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       	androidPackage := os.Getenv("ANDROID_PACKAGE_NAME")

     

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       	if androidPackage == "" {

     

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       		androidPackage = "social.coves.app" // Default for development

     

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       		slog.Warn("ANDROID_PACKAGE_NAME not set, using default",

     

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       			"package", androidPackage,

     

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       			"note", "Set ANDROID_PACKAGE_NAME env var for production App Links")

     

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       	}

     

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       	// Get SHA-256 fingerprint from environment

     

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       	// This is the SHA-256 fingerprint of the app's signing certificate

     

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       	//

     

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       	// To get the fingerprint:

     

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       	// Production: keytool -list -v -keystore release.jks -alias release

     

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       	// Debug: keytool -list -v -keystore ~/.android/debug.keystore -alias androiddebugkey -storepass android -keypass android

     

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       	//

     

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       	// Look for "SHA256:" in the output

     

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       	// Format: AA:BB:CC:DD:...:FF (64 hex characters separated by colons)

     

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       	androidFingerprint := os.Getenv("ANDROID_SHA256_FINGERPRINT")

     

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       	if androidFingerprint == "" {

     

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       		// Development fallback - this won't work for real App Links verification

     

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       		// IMPORTANT: This MUST be set in production for App Links to work

     

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       		androidFingerprint = "00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00"

     

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       		slog.Warn("ANDROID_SHA256_FINGERPRINT not set, using development placeholder",

     

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       			"fingerprint", androidFingerprint,

     

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       			"note", "Set ANDROID_SHA256_FINGERPRINT env var for production App Links")

     

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       	}

     

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       	w.Header().Set("Content-Type", "application/json")

     

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       	// Construct the response per Google's Digital Asset Links spec

     

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       	// See: https://developers.google.com/digital-asset-links/v1/getting-started

     

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       	response := []map[string]interface{}{

     

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       		{

     

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       			// delegate_permission/common.handle_all_urls grants the app permission

     

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       			// to handle URLs for this domain

     

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       			"relation": []string{"delegate_permission/common.handle_all_urls"},

     

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       			"target": map[string]interface{}{

     

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       				"namespace":    "android_app",

     

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       				"package_name": androidPackage,

     

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       				// List of certificate fingerprints that can sign the app

     

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       				// Multiple fingerprints can be provided for different signing keys

     

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       				// (e.g., debug + release)

     

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       				"sha256_cert_fingerprints": []string{

     

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       					androidFingerprint,

     

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       				},

     

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       			},

     

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       		},

     

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       	}

     

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       	if err := json.NewEncoder(w).Encode(response); err != nil {

     

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       		slog.Error("failed to encode assetlinks.json", "error", err)

     

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       		http.Error(w, "internal server error", http.StatusInternalServerError)

     

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       		return

     

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       	}

     

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       	slog.Debug("served assetlinks.json",

     

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       		"package", androidPackage,

     

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       		"fingerprint", androidFingerprint)

     

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       }

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internal/api/routes/wellknown.go

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       package routes

     

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       import (

     

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       	"Coves/internal/api/handlers/wellknown"

     

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       	"github.com/go-chi/chi/v5"

     

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       )

     

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       // RegisterWellKnownRoutes registers RFC 8615 well-known URI endpoints

     

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       // These endpoints are used for service discovery and mobile app deep linking

     

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       //

     

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       // Spec: https://www.rfc-editor.org/rfc/rfc8615.html

     

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       func RegisterWellKnownRoutes(r chi.Router) {

     

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       	// iOS Universal Links configuration

     

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       	// Required for cryptographically-bound deep linking on iOS

     

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       	// Must be served at exact path /.well-known/apple-app-site-association

     

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       	// Content-Type: application/json (no redirects allowed)

     

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       	r.Get("/.well-known/apple-app-site-association", wellknown.HandleAppleAppSiteAssociation)

     

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       	// Android App Links configuration

     

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       	// Required for cryptographically-bound deep linking on Android

     

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       	// Must be served at exact path /.well-known/assetlinks.json

     

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       	// Content-Type: application/json (no redirects allowed)

     

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       	r.Get("/.well-known/assetlinks.json", wellknown.HandleAssetLinks)

     

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       }