immich/mobile/lib/routing/auth_guard.dart

import 'dart:io';

import 'package:auto_route/auto_route.dart';
import 'package:immich_mobile/routing/router.dart';
import 'package:immich_mobile/shared/models/store.dart';
import 'package:immich_mobile/shared/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');
        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.');
      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.");
        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');
    }
  }
}