Source Code added

mobile/lib/routing/auth_guard.dart

@@ -0,0 +1,49 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:auto_route/auto_route.dart';
+import 'package:immich_mobile/domain/models/store.model.dart';
+import 'package:immich_mobile/domain/services/store.service.dart';
+import 'package:immich_mobile/entities/store.entity.dart';
+import 'package:immich_mobile/routing/router.dart';
+import 'package:immich_mobile/services/api.service.dart';
+import 'package:logging/logging.dart';
+import 'package:openapi/api.dart';
+
+class AuthGuard extends AutoRouteGuard {
+  final ApiService _apiService;
+  final _log = Logger("AuthGuard");
+  AuthGuard(this._apiService);
+  @override
+  void onNavigation(NavigationResolver resolver, StackRouter router) async {
+    resolver.next(true);
+
+    try {
+      // Look in the store for an access token
+      Store.get(StoreKey.accessToken);
+
+      // Validate the access token with the server
+      final res = await _apiService.authenticationApi.validateAccessToken();
+      if (res == null || res.authStatus != true) {
+        // If the access token is invalid, take user back to login
+        _log.fine('User token is invalid. Redirecting to login');
+        unawaited(router.replaceAll([const LoginRoute()]));
+      }
+    } on StoreKeyNotFoundException catch (_) {
+      // If there is no access token, take us to the login page
+      _log.warning('No access token in the store.');
+      unawaited(router.replaceAll([const LoginRoute()]));
+      return;
+    } on ApiException catch (e) {
+      // On an unauthorized request, take us to the login page
+      if (e.code == HttpStatus.unauthorized) {
+        _log.warning("Unauthorized access token.");
+        unawaited(router.replaceAll([const LoginRoute()]));
+        return;
+      }
+    } catch (e) {
+      // Otherwise, this is not fatal, but we still log the warning
+      _log.warning('Error validating access token from server: $e');
+    }
+  }
+}