commit b26c0a5dbae5271ab71d3c025e5dbf232734e2aa · bretton.dev/coves-mobile

+78
lib/utils/url_launcher.dart
···

       1
       1
       +
       import 'package:flutter/foundation.dart';

     

       2
       2
       +
       import 'package:flutter/material.dart';

     

       3
       3
       +
       import 'package:url_launcher/url_launcher.dart';

     

       4
       4
       +
       

     

       5
       5
       +
       /// Utility class for safely launching external URLs

     

       6
       6
       +
       ///

     

       7
       7
       +
       /// Provides security validation and error handling for opening URLs

     

       8
       8
       +
       /// in external browsers or applications.

     

       9
       9
       +
       class UrlLauncher {

     

       10
       10
       +
         UrlLauncher._(); // Private constructor to prevent instantiation

     

       11
       11
       +
       

     

       12
       12
       +
         /// Allowed URL schemes for security

     

       13
       13
       +
         static const _allowedSchemes = ['http', 'https'];

     

       14
       14
       +
       

     

       15
       15
       +
         /// Launches an external URL with security validation

     

       16
       16
       +
         ///

     

       17
       17
       +
         /// Returns true if the URL was successfully launched, false otherwise.

     

       18
       18
       +
         ///

     

       19
       19
       +
         /// Security:

     

       20
       20
       +
         /// - Only allows http and https schemes

     

       21
       21
       +
         /// - Blocks potentially malicious schemes (javascript:, file:, etc.)

     

       22
       22
       +
         /// - Opens in external browser for user control

     

       23
       23
       +
         ///

     

       24
       24
       +
         /// If [context] is provided and mounted, shows a user-friendly error message

     

       25
       25
       +
         /// when the URL cannot be opened.

     

       26
       26
       +
         static Future<bool> launchExternalUrl(

     

       27
       27
       +
           String url, {

     

       28
       28
       +
           BuildContext? context,

     

       29
       29
       +
         }) async {

     

       30
       30
       +
           try {

     

       31
       31
       +
             final uri = Uri.parse(url);

     

       32
       32
       +
       

     

       33
       33
       +
             // Validate URL scheme for security

     

       34
       34
       +
             if (!_allowedSchemes.contains(uri.scheme.toLowerCase())) {

     

       35
       35
       +
               if (kDebugMode) {

     

       36
       36
       +
                 debugPrint('Blocked non-http(s) URL scheme: ${uri.scheme}');

     

       37
       37
       +
               }

     

       38
       38
       +
               _showErrorIfPossible(context, 'Invalid link format');

     

       39
       39
       +
               return false;

     

       40
       40
       +
             }

     

       41
       41
       +
       

     

       42
       42
       +
             // Check if URL can be launched

     

       43
       43
       +
             if (await canLaunchUrl(uri)) {

     

       44
       44
       +
               return await launchUrl(uri, mode: LaunchMode.externalApplication);

     

       45
       45
       +
             }

     

       46
       46
       +
       

     

       47
       47
       +
             if (kDebugMode) {

     

       48
       48
       +
               debugPrint('Could not launch URL: $url');

     

       49
       49
       +
             }

     

       50
       50
       +
             // ignore: use_build_context_synchronously

     

       51
       51
       +
             _showErrorIfPossible(context, 'Could not open link');

     

       52
       52
       +
             return false;

     

       53
       53
       +
           } on FormatException catch (e) {

     

       54
       54
       +
             if (kDebugMode) {

     

       55
       55
       +
               debugPrint('Invalid URL format: $url - $e');

     

       56
       56
       +
             }

     

       57
       57
       +
             // ignore: use_build_context_synchronously

     

       58
       58
       +
             _showErrorIfPossible(context, 'Invalid link format');

     

       59
       59
       +
             return false;

     

       60
       60
       +
           } on Exception catch (e) {

     

       61
       61
       +
             if (kDebugMode) {

     

       62
       62
       +
               debugPrint('Error launching URL: $url - $e');

     

       63
       63
       +
             }

     

       64
       64
       +
             // ignore: use_build_context_synchronously

     

       65
       65
       +
             _showErrorIfPossible(context, 'Could not open link');

     

       66
       66
       +
             return false;

     

       67
       67
       +
           }

     

       68
       68
       +
         }

     

       69
       69
       +
       

     

       70
       70
       +
         /// Shows an error snackbar if context is available and mounted

     

       71
       71
       +
         static void _showErrorIfPossible(BuildContext? context, String message) {

     

       72
       72
       +
           if (context != null && context.mounted) {

     

       73
       73
       +
             ScaffoldMessenger.of(

     

       74
       74
       +
               context,

     

       75
       75
       +
             ).showSnackBar(SnackBar(content: Text(message)));

     

       76
       76
       +
           }

     

       77
       77
       +
         }

     

       78
       78
       +
       }