Add token check on app startup

lib/main.dart

@@ -15,12 +15,12 @@ import 'firebase_options.dart';
 final scaffoldMessengerKey = GlobalKey<ScaffoldMessengerState>();
 
 Future<void> main() async {
+  Logger.level = Level.info;
   WidgetsFlutterBinding.ensureInitialized();
   await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform);
 
-  Logger.level = Level.debug;
   runApp(
-    const ProviderScope(
+     const ProviderScope(
       child: App(),
     ),
   );
@@ -29,12 +29,19 @@ Future<void> main() async {
 bool isPushNotificationListenerSet = false;
 
 class App extends ConsumerWidget {
-  const App({super.key});
+
+   const App({
+    super.key,
+  });
+
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final userState = ref.watch(userViewModelProvider);
 
+    bool isLoggedIn = ref.watch(userViewModelProvider).user != null;
+
+
     _handleErrors(ref, userState);
     _setupNotifications(ref, userState);
 
@@ -45,7 +52,7 @@ class App extends ConsumerWidget {
           ref.watch(themeModeProvider), // Use the theme mode from the provider
       navigatorKey: navigatorKey,
       scaffoldMessengerKey: scaffoldMessengerKey,
-      home: userState.user == null
+      home: !isLoggedIn
           ? const WelcomeScreen()
           : const NavigationTab(),
       routes: _buildRoutes(),

lib/view_models/user_view_model.dart

@@ -12,14 +12,19 @@ import 'package:gocast_mobile/models/error/error_model.dart';
 import 'package:gocast_mobile/models/user/user_state_model.dart';
 import 'package:gocast_mobile/utils/globals.dart';
 import 'package:gocast_mobile/utils/sort_utils.dart';
+import 'package:jwt_decode/jwt_decode.dart';
 import 'package:logger/logger.dart';
 
 class UserViewModel extends StateNotifier<UserState> {
   final Logger _logger = Logger();
 
   final GrpcHandler _grpcHandler;
 
-  UserViewModel(this._grpcHandler) : super(const UserState());
+  UserViewModel(this._grpcHandler) : super(const UserState()){
+    // Check if the user is already logged in
+    _checkToken();
+  }
+
 
   /// Handles basic authentication.
   /// If the authentication is successful, it navigates to the courses screen.
@@ -152,4 +157,23 @@ class UserViewModel extends StateNotifier<UserState> {
     state = state.copyWith(selectedSemester: choice);
   }
 
+  Future<void> _checkToken() async {
+    String token = await _getToken();
+    if(token.isNotEmpty && !Jwt.isExpired(token)) {
+      _logger.i('Token found, fetching user: $token');
+      fetchUser();
+    }else {
+      _logger.i('Token not found or expired');
+    }
+  }
+
+  Future<String> _getToken() async {
+    try {
+      return await TokenHandler.loadToken('jwt');
+    } catch(e){
+      Logger().w("Token not found");
+      return '';
+    }
+  }
+
 }

pubspec.lock

@@ -400,6 +400,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.6.7"
+  jwt_decode:
+    dependency: "direct main"
+    description:
+      name: jwt_decode
+      sha256: d2e9f68c052b2225130977429d30f187aa1981d789c76ad104a32243cfdebfbb
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.3.1"
   lints:
     dependency: transitive
     description:

pubspec.yaml

@@ -35,6 +35,7 @@ dependencies:
   chewie: ^1.7.4
   url_launcher: ^6.2.3
   path_provider: any
+  jwt_decode: ^0.3.1
 
 dev_dependencies:
   flutter_test: