fix: fall back to regular OIDC when silent auth fails

When prompt=none fails with login_required (no Authentik session),
automatically redirect to regular OIDC flow to show login UI.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,6 +7,21 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.1.4] - 2026-01-04
+
+### Fixed
+- Silent OIDC fallback: when `prompt=none` fails with `login_required` (no Authentik session), automatically fall back to regular OIDC flow to show login UI
+
+## [1.1.3] - 2026-01-04
+
+### Changed
+- **Web auth uses silent OIDC with JWT Bearer tokens**
+  - Uses `prompt=none` to silently obtain JWT when Authentik session exists (via NPM forward auth)
+  - Flutter sends Bearer token to core-api instead of relying on forward auth cookies
+  - Fixes cross-subdomain cookie issues between home.schweitz.net and api.schweitz.net
+  - Callback now syncs with `/auth/sync` to get user profile and roles from core-api
+  - API interceptor now adds Bearer token on web (previously skipped)
+
 ## [1.1.2] - 2026-01-04
 
 ### Changed

lib/core/api/api_interceptors.dart

@@ -10,8 +10,7 @@ import 'package:tatlock_ui/core/error/app_exception.dart';
 /// Adds authentication token to requests.
 ///
 /// - **LAN mode**: Skipped entirely (no auth required)
-/// - **Web**: Skipped (cookies handle auth via NPM forward auth)
-/// - **Mobile**: Adds Bearer token from OIDC authentication
+/// - **Web + Mobile**: Adds Bearer token from OIDC authentication
 class AuthInterceptor extends Interceptor {
   AuthInterceptor(this._ref);
 
@@ -25,17 +24,11 @@ class AuthInterceptor extends Interceptor {
       return;
     }
 
-    // Skip Bearer token on web - cookies handle auth via NPM forward auth
-    if (kIsWeb) {
-      handler.next(options);
-      return;
-    }
-
-    // Mobile: Add Bearer token from OIDC authentication
+    // Add Bearer token for all platforms (web + mobile)
     final authState = _ref.read(authProvider);
 
     authState.whenData((auth) {
-      if (auth.isAuthenticated && auth.accessToken != null && auth.accessToken != 'web-session') {
+      if (auth.isAuthenticated && auth.accessToken != null) {
         options.headers['Authorization'] = 'Bearer ${auth.accessToken}';
       }
     });

lib/core/auth/auth_provider.dart

@@ -1,4 +1,4 @@
-import 'dart:convert' show base64Url, jsonDecode, jsonEncode, utf8;
+import 'dart:convert' show jsonDecode, jsonEncode;
 import 'dart:developer' as developer;
 
 import 'package:flutter/foundation.dart' show kIsWeb;
@@ -40,10 +40,44 @@ class AuthNotifier extends _$AuthNotifier {
 
   @override
   Future<AuthState> build() async {
-    // Load stored auth on all platforms
+    // On web with auth required, use silent OIDC to get JWT
+    if (kIsWeb && AppConfig.requiresAuth) {
+      // First check if we have stored tokens
+      final storedAuth = await _loadStoredAuth();
+      if (storedAuth.isAuthenticated && !storedAuth.isTokenExpired) {
+        developer.log('Web: Using stored tokens for ${storedAuth.userName}', name: 'auth');
+        return storedAuth;
+      }
+
+      // No valid tokens - initiate silent OIDC
+      // NPM forward auth ensures user has Authentik session
+      // prompt=none will get us a token instantly without UI
+      developer.log('Web: No valid tokens, initiating silent OIDC', name: 'auth');
+      _initiateSilentOidc();
+
+      // Return unauthenticated state - will redirect before this matters
+      return const AuthState();
+    }
+
+    // Mobile/LAN: Load stored auth from SharedPreferences
     return _loadStoredAuth();
   }
 
+  /// Initiate silent OIDC flow on web.
+  ///
+  /// Uses prompt=none to get a token without showing login UI.
+  /// Relies on existing Authentik session (established via NPM forward auth).
+  Future<void> _initiateSilentOidc() async {
+    try {
+      final oidcService = OidcServiceWeb();
+      final authUrl = await oidcService.getAuthorizationUrl(silent: true);
+      developer.log('Redirecting to silent OIDC: $authUrl', name: 'auth');
+      web_utils.redirectTo(authUrl);
+    } catch (e) {
+      developer.log('Failed to initiate silent OIDC: $e', name: 'auth');
+    }
+  }
+
   Future<AuthState> _loadStoredAuth() async {
     try {
       final prefs = await SharedPreferences.getInstance();
@@ -265,27 +299,28 @@ class AuthNotifier extends _$AuthNotifier {
       final oidcService = OidcServiceWeb();
       final tokens = await oidcService.exchangeCode(code, callbackState);
 
-      // Step 2: Decode JWT to extract user info (skip core-api sync)
-      final claims = _decodeJwtClaims(tokens.accessToken);
-      final userName = claims['name'] as String? ??
-          claims['preferred_username'] as String? ??
-          'User';
-      final userEmail = claims['email'] as String? ?? '';
-      final authentikId = claims['sub'] as String?;
-      final groups = (claims['groups'] as List<dynamic>?)?.cast<String>() ?? [];
+      // Step 2: Sync with core-api to get user profile and roles
+      developer.log('Syncing with core-api', name: 'auth');
+      final authDatasource = ref.read(authDatasourceProvider);
+      final syncResponse = await authDatasource.syncUser(tokens.accessToken);
 
-      developer.log('JWT claims: name=$userName, email=$userEmail, groups=$groups', name: 'auth');
+      developer.log(
+        'Synced user: ${syncResponse.name} with ${syncResponse.roles.length} roles',
+        name: 'auth',
+      );
 
-      // Step 3: Store credentials and user data from JWT
+      // Step 3: Store credentials and user data from sync response
       await _storeAuth(
         accessToken: tokens.accessToken,
         refreshToken: tokens.refreshToken,
         expiresAt: tokens.expiresAt,
-        authentikId: authentikId,
-        userName: userName,
-        userEmail: userEmail,
-        // Roles from groups - for now just store group names
-        // Full role parsing can be done later if needed
+        userId: syncResponse.userId,
+        authentikId: syncResponse.authentikId,
+        userName: syncResponse.name,
+        userEmail: syncResponse.email,
+        avatarUrl: syncResponse.avatarUrl,
+        roles: syncResponse.roles,
+        preferences: syncResponse.preferences,
       );
 
       state = AsyncData(AuthState(
@@ -293,12 +328,16 @@ class AuthNotifier extends _$AuthNotifier {
         accessToken: tokens.accessToken,
         refreshToken: tokens.refreshToken,
         expiresAt: tokens.expiresAt,
-        authentikId: authentikId,
-        userName: userName,
-        userEmail: userEmail,
+        userId: syncResponse.userId,
+        authentikId: syncResponse.authentikId,
+        userName: syncResponse.name,
+        userEmail: syncResponse.email,
+        avatarUrl: syncResponse.avatarUrl,
+        roles: syncResponse.roles,
+        preferences: syncResponse.preferences,
       ));
 
-      developer.log('Authenticated as $userName', name: 'auth');
+      developer.log('Authenticated as ${syncResponse.name}', name: 'auth');
 
       // Clean up the URL by removing the query parameters
       web_utils.replaceUrl('/');
@@ -311,35 +350,6 @@ class AuthNotifier extends _$AuthNotifier {
     }
   }
 
-  /// Decode JWT payload without verification (validation happens server-side).
-  Map<String, dynamic> _decodeJwtClaims(String jwt) {
-    try {
-      final parts = jwt.split('.');
-      if (parts.length != 3) {
-        developer.log('Invalid JWT format', name: 'auth');
-        return {};
-      }
-
-      // Decode the payload (second part)
-      String payload = parts[1];
-      // Add padding if needed for base64
-      switch (payload.length % 4) {
-        case 2:
-          payload += '==';
-          break;
-        case 3:
-          payload += '=';
-          break;
-      }
-
-      final decoded = utf8.decode(base64Url.decode(payload));
-      return jsonDecode(decoded) as Map<String, dynamic>;
-    } catch (e) {
-      developer.log('Failed to decode JWT: $e', name: 'auth');
-      return {};
-    }
-  }
-
   /// Sign out and clear stored credentials.
   ///
   /// On web, also redirects to Authentik's logout endpoint to end the SSO session.

lib/core/auth/oidc_service_web.dart

@@ -34,7 +34,12 @@ class OidcServiceWeb implements OidcService {
   ///
   /// Returns a URL that the browser should navigate to for authentication.
   /// The [codeVerifier] and [state] are stored for later verification.
-  Future<String> getAuthorizationUrl() async {
+  ///
+  /// If [silent] is true, adds `prompt=none` to skip login UI.
+  /// This is used when the user already has an Authentik session (via NPM).
+  /// Authentik will instantly redirect back with a code, or return an error
+  /// if there's no valid session.
+  Future<String> getAuthorizationUrl({bool silent = false}) async {
     // Fetch OIDC discovery document
     final discovery = await _fetchDiscovery();
     final authEndpoint = discovery['authorization_endpoint'] as String;
@@ -59,10 +64,11 @@ class OidcServiceWeb implements OidcService {
       'code_challenge': codeChallenge,
       'code_challenge_method': 'S256',
       'state': state,
+      if (silent) 'prompt': 'none', // Silent auth - no UI, instant redirect
     };
 
     final uri = Uri.parse(authEndpoint).replace(queryParameters: params);
-    developer.log('Authorization URL: $uri', name: 'oidc_web');
+    developer.log('Authorization URL (silent=$silent): $uri', name: 'oidc_web');
     return uri.toString();
   }
 

lib/routing/app_router.dart

@@ -137,6 +137,13 @@ class _OidcCallbackPageState extends ConsumerState<_OidcCallbackPage> {
 
     // Check for error from Authentik
     if (widget.error != null) {
+      // Silent OIDC (prompt=none) failed - no existing session
+      // Fall back to regular OIDC flow to show login UI
+      if (widget.error == 'login_required') {
+        ref.read(authProvider.notifier).signIn();
+        return;
+      }
+
       setState(() {
         _isProcessing = false;
         _error = widget.errorDescription ?? widget.error;

lib/shared/layouts/app_scaffold.dart

@@ -46,14 +46,7 @@ class _AppScaffoldState extends ConsumerState<AppScaffold> {
       return _buildScaffold(context);
     }
 
-    // On web, NPM forward auth handles authentication at the proxy level.
-    // If we reach this point, the user is already authenticated by NPM.
-    // No need for Flutter's OIDC flow - just show the app.
-    if (kIsWeb) {
-      return _buildScaffold(context);
-    }
-
-    // Mobile: Use Flutter's OIDC flow
+    // Watch auth state (works for both web and mobile)
     final authAsync = ref.watch(authProvider);
 
     return authAsync.when(
@@ -64,7 +57,13 @@ class _AppScaffoldState extends ConsumerState<AppScaffold> {
           return _buildScaffold(context);
         }
 
-        // Not authenticated - auto-initiate OIDC
+        // On web, NPM handles auth - if we're here without auth, something is wrong
+        // (NPM should have redirected to Authentik before we loaded)
+        if (kIsWeb) {
+          return _buildAuthErrorScreen(context, 'Authentication required');
+        }
+
+        // Mobile: Not authenticated - auto-initiate OIDC
         if (!_authInitiated) {
           _authInitiated = true;
           WidgetsBinding.instance.addPostFrameCallback((_) {
@@ -75,7 +74,7 @@ class _AppScaffoldState extends ConsumerState<AppScaffold> {
         // Show loading while redirecting to Authentik
         return _buildAuthLoadingScreen(context, 'Redirecting to sign in...');
       },
-      loading: () => _buildAuthLoadingScreen(context, 'Checking authentication...'),
+      loading: () => _buildAuthLoadingScreen(context, 'Loading user info...'),
       error: (error, _) => _buildAuthErrorScreen(context, error),
     );
   }

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 1.1.2+1
+version: 1.1.4+1
 
 environment:
   sdk: ^3.10.4