Add fingerprint (local_auth) session + 3-min inactivity timeout (default), activity resets timer, settings: biometric toggle + timeout picker

android/app/src/main/AndroidManifest.xml

@@ -1,8 +1,10 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
     <!-- Internet permission required for Google Sign-In -->
     <uses-permission android:name="android.permission.INTERNET"/>
+    <!-- Biometric / fingerprint authentication -->
+    <uses-permission android:name="android.permission.USE_BIOMETRIC"/>
+    <uses-permission android:name="android.permission.USE_FINGERPRINT"/>
     <queries>
-        <!-- Used by Google Sign-In to query browser packages -->
         <intent>
             <action android:name="android.intent.action.VIEW"/>
             <category android:name="android.intent.category.BROWSABLE"/>
@@ -31,8 +33,6 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
-        <!-- Don't delete the meta-data below.
-             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
         <meta-data
             android:name="flutterEmbedding"
             android:value="2" />

lib/auth_screen.dart

@@ -5,7 +5,8 @@ import 'package:login_vault_app/auth_service.dart';
 import 'package:login_vault_app/dashboard_screen.dart';
 import 'package:login_vault_app/theme_provider.dart';
 
-/// First-launch screen: register with email+password, or with Google.
+/// First screen: register, or (if registered) re-authenticate.
+/// If a valid session exists, skip straight to the Dashboard.
 class AuthScreen extends StatefulWidget {
   final AuthService auth;
   const AuthScreen({super.key, required this.auth});
@@ -17,12 +18,29 @@ class AuthScreen extends StatefulWidget {
 class _AuthScreenState extends State<AuthScreen> {
   final _emailCtrl = TextEditingController();
   final _passCtrl = TextEditingController();
-  bool _isLogin = true; // toggle register/login
+  bool _isLogin = true;
   bool _busy = false;
   String? _error;
 
+  @override
+  void initState() {
+    super.initState();
+    _trySilentAuth();
+  }
+
+  /// On open: if a valid session is present, go straight to Dashboard.
+  Future<void> _trySilentAuth() async {
+    final timeout = await widget.auth.getTimeoutMinutes();
+    final valid = await widget.auth.hasValidSession(timeout);
+    if (valid && mounted) {
+      final email = await widget.auth.getEmail() ?? '';
+      _goToDashboard(email);
+    }
+  }
+
   void _goToDashboard(String email) {
     if (!mounted) return;
+    widget.auth.openSession(); // refresh session timestamp
     Navigator.of(context).pushReplacement(
       MaterialPageRoute(
         builder: (_) => DashboardScreen(

lib/auth_service.dart

@@ -1,35 +1,31 @@
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+import 'package:local_auth/local_auth.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 import 'package:login_vault_app/constants.dart';
 
-/// Handles app-level authentication and persistence of the local identity.
+/// Handles app-level authentication, session, and local identity.
-///
-/// On first launch the user registers (email+password OR Google). The chosen
-/// email is stored locally as the key ([AppConstants.secureKeyEmail]) and the
-/// app password (used to lock the dashboard) is stored in secure storage.
 class AuthService {
   final FlutterSecureStorage _storage = const FlutterSecureStorage();
+  final LocalAuthentication _localAuth = LocalAuthentication();
+
+  // ---------- Identity (email + app password) ----------
 
-  /// Returns the stored email, or null if not registered yet.
   Future<String?> getEmail() async =>
       await _storage.read(key: AppConstants.secureKeyEmail);
 
   Future<String?> getAppPassword() async =>
       await _storage.read(key: AppConstants.secureKeyAppPassword);
 
-  /// True if a user identity already exists locally.
   Future<bool> isRegistered() async => (await getEmail()) != null;
 
-  /// Register with email + app password.
   Future<void> registerWithEmail(String email, String appPassword) async {
     await _storage.write(key: AppConstants.secureKeyEmail, value: email);
     await _storage.write(
         key: AppConstants.secureKeyAppPassword, value: appPassword);
   }
 
-  /// Register with Google (email supplied by Google sign-in).
   Future<void> registerWithGoogle(String email) async {
     await _storage.write(key: AppConstants.secureKeyEmail, value: email);
-    // App password defaults to a marker; user can change it later in settings.
     final existing = await getAppPassword();
     if (existing == null) {
       await _storage.write(
@@ -41,27 +37,103 @@ class AuthService {
   Future<bool> verifyPassword(String password) async {
     final stored = await getAppPassword();
     if (stored == null) return false;
-    if (stored == '__google__') {
+    if (stored == '__google__') return true; // google users: any pass ok
-      // Google users have no password by default; let any entry pass OR force set.
-      return true;
-    }
     return stored == password;
   }
 
-  /// Change the app password (used in settings).
   Future<void> changePassword(String newPassword) async {
     await _storage.write(
         key: AppConstants.secureKeyAppPassword, value: newPassword);
   }
 
-  Future<void> logout() async {
+  // ---------- Biometric (fingerprint) ----------
-    // Keep email (identity) but we treat logout as returning to auth screen
+
-    // with the email still known. To fully reset, call [reset].
+  /// Can the device authenticate with biometrics (fingerprint etc.)?
+  Future<bool> canUseBiometrics() async {
+    try {
+      final supported = await _localAuth.isDeviceSupported();
+      if (!supported) return false;
+      final available = await _localAuth.getAvailableBiometrics();
+      return available.isNotEmpty;
+    } catch (_) {
+      return false;
+    }
   }
 
-  /// Wipe local identity (for completeness / debugging).
+  /// Prompt the OS biometric dialog. Returns true on success.
+  Future<bool> authenticateWithBiometrics() async {
+    try {
+      return await _localAuth.authenticate(
+        localizedReason: 'Gunakan sidik jari untuk membuka Login Vault',
+        options: const AuthenticationOptions(
+          biometricOnly: true,
+          stickyAuth: true,
+        ),
+      );
+    } catch (_) {
+      return false;
+    }
+  }
+
+  // ---------- Session ----------
+
+  /// Persist that a session was just opened (with timestamp).
+  Future<void> openSession() async {
+    await _storage.write(
+        key: AppConstants.secureKeySession, value: DateTime.now().toIso8601String());
+  }
+
+  Future<void> closeSession() async {
+    await _storage.delete(key: AppConstants.secureKeySession);
+  }
+
+  /// Returns true if a valid, non-expired session exists.
+  /// [timeoutMinutes] = 0 means "stay logged in until manual logout".
+  Future<bool> hasValidSession(int timeoutMinutes) async {
+    if (timeoutMinutes <= 0) {
+      // never auto-expire; just check a session was opened
+      final v = await _storage.read(key: AppConstants.secureKeySession);
+      return v != null;
+    }
+    final v = await _storage.read(key: AppConstants.secureKeySession);
+    if (v == null) return false;
+    final opened = DateTime.tryParse(v);
+    if (opened == null) return false;
+    final diff = DateTime.now().difference(opened).inMinutes;
+    return diff < timeoutMinutes;
+  }
+
+  // ---------- Timeout setting ----------
+
+  /// Get configured session timeout (minutes). Default 3.
+  Future<int> getTimeoutMinutes() async {
+    final sp = await _prefs();
+    return sp.getInt(AppConstants.prefTimeout) ?? 3;
+  }
+
+  Future<void> setTimeoutMinutes(int minutes) async {
+    final sp = await _prefs();
+    await sp.setInt(AppConstants.prefTimeout, minutes);
+  }
+
+  // ---------- Biometric toggle setting ----------
+
+  Future<bool> isBiometricEnabled() async {
+    final sp = await _prefs();
+    return sp.getBool(AppConstants.prefBiometric) ?? false;
+  }
+
+  Future<void> setBiometricEnabled(bool on) async {
+    final sp = await _prefs();
+    await sp.setBool(AppConstants.prefBiometric, on);
+  }
+
+  Future<SharedPreferences> _prefs() async =>
+      await SharedPreferences.getInstance();
+
   Future<void> reset() async {
     await _storage.delete(key: AppConstants.secureKeyEmail);
     await _storage.delete(key: AppConstants.secureKeyAppPassword);
+    await _storage.delete(key: AppConstants.secureKeySession);
   }
 }

lib/constants.dart

@@ -13,7 +13,12 @@ class AppConstants {
   /// SQLite database file name.
   static const String dbName = 'login_vault.db';
 
-  /// Application package-ish identifiers for secure storage keys.
+  /// Secure storage keys.
   static const String secureKeyEmail = 'vault_email';
   static const String secureKeyAppPassword = 'vault_app_password';
+  static const String secureKeySession = 'vault_session_opened_at';
+
+  /// SharedPreferences keys (settings).
+  static const String prefTimeout = 'session_timeout_minutes';
+  static const String prefBiometric = 'biometric_enabled';
 }

lib/dashboard_screen.dart

@@ -29,17 +29,25 @@ class _DashboardScreenState extends State<DashboardScreen> {
   @override
   void initState() {
     super.initState();
-    _searchCtrl.addListener(_onSearchChanged);
+    _searchCtrl.addListener(() {
+      _touch(); // user activity
+      _onSearchChanged();
+    });
     _refresh();
   }
 
   @override
   void dispose() {
-    _searchCtrl.removeListener(_onSearchChanged);
     _searchCtrl.dispose();
     super.dispose();
   }
 
+  /// Refresh the session timestamp — called on every user interaction so the
+  /// 3-minute inactivity timeout only fires when the user is truly idle.
+  void _touch() {
+    widget.auth.openSession();
+  }
+
   void _onSearchChanged() => _refresh();
 
   Future<void> _refresh() async {
@@ -66,6 +74,7 @@ class _DashboardScreenState extends State<DashboardScreen> {
   }
 
   Future<void> _editEntry(VaultEntry e) async {
+    _touch();
     final result = await showEntryDialog(
       context,
       title: 'Edit konten',
@@ -80,6 +89,7 @@ class _DashboardScreenState extends State<DashboardScreen> {
   }
 
   Future<void> _addEntry() async {
+    _touch();
     final result = await showEntryDialog(
       context,
       title: 'Tambah entri baru',
@@ -110,13 +120,16 @@ class _DashboardScreenState extends State<DashboardScreen> {
           IconButton(
             icon: const Icon(Icons.settings),
             tooltip: 'Pengaturan',
-            onPressed: () => Navigator.push(
+            onPressed: () {
+              _touch();
+              Navigator.push(
                 context,
                 MaterialPageRoute(
                   builder: (_) => SettingsScreen(
                       auth: widget.auth, theme: widget.theme),
                 ),
-            ).then((_) => _refresh()),
+              ).then((_) => _refresh());
+            },
           ),
         ],
       ),
@@ -139,6 +152,7 @@ class _DashboardScreenState extends State<DashboardScreen> {
                     ? IconButton(
                         icon: const Icon(Icons.clear),
                         onPressed: () {
+                          _touch();
                           _searchCtrl.clear();
                           _refresh();
                         },
@@ -167,20 +181,20 @@ class _DashboardScreenState extends State<DashboardScreen> {
                               child: const Icon(Icons.delete, color: Colors.white),
                             ),
                             confirmDismiss: (_) async {
-                              // Use our own dialog for nicer copy.
+                              _touch();
                               final c = await showConfirmDialog(
                                 context,
                                 title: 'Hapus entri?',
-                                body:
+                                body: 'Yakin hapus "${e.id}"?',
-                                    'Yakin hapus "${e.id}"?',
                               );
                               if (c == true) await _deleteEntry(e);
-                              return false; // we handle deletion ourselves
+                              return false;
                             },
                             child: Card(
                               margin: const EdgeInsets.symmetric(
                                   horizontal: 12, vertical: 6),
                               child: ExpansionTile(
+                                onExpansionChanged: (_) => _touch(),
                                 title: Text(e.id,
                                     style: const TextStyle(
                                         fontWeight: FontWeight.bold)),

lib/main.dart

@@ -11,26 +11,39 @@ void main() async {
   final theme = ThemeProvider();
   final registered = await auth.isRegistered();
   final email = await auth.getEmail() ?? '';
+  final timeout = await auth.getTimeoutMinutes();
+  final hasSession = await auth.hasValidSession(timeout);
+  final startAtDashboard = registered && email.isNotEmpty && hasSession;
   runApp(
     MultiProvider(
       providers: [
         Provider<AuthService>.value(value: auth),
         ChangeNotifierProvider<ThemeProvider>.value(value: theme),
       ],
-      child: MyApp(registered: registered, email: email),
+      child: MyApp(
+        startAtDashboard: startAtDashboard,
+        auth: auth,
+        theme: theme,
+        email: email,
+      ),
     ),
   );
 }
 
 class MyApp extends StatelessWidget {
-  final bool registered;
+  final bool startAtDashboard;
+  final AuthService auth;
+  final ThemeProvider theme;
   final String email;
-  const MyApp({super.key, required this.registered, required this.email});
+  const MyApp(
+      {super.key,
+      required this.startAtDashboard,
+      required this.auth,
+      required this.theme,
+      required this.email});
 
   @override
   Widget build(BuildContext context) {
-    final theme = Provider.of<ThemeProvider>(context);
-    final auth = Provider.of<AuthService>(context, listen: false);
     return MaterialApp(
       title: 'Login Vault',
       theme: ThemeData(
@@ -44,8 +57,7 @@ class MyApp extends StatelessWidget {
         colorSchemeSeed: Colors.indigo,
       ),
       themeMode: theme.mode,
-      // decide home: if registered AND email known -> Dashboard, else Auth.
+      home: startAtDashboard
-      home: (registered && email.isNotEmpty)
           ? DashboardScreen(auth: auth, theme: theme, email: email)
           : AuthScreen(auth: auth),
       debugShowCheckedModeBanner: false,

lib/settings_screen.dart

@@ -4,7 +4,8 @@ import 'package:flutter/services.dart';
 import 'package:login_vault_app/auth_service.dart';
 import 'package:login_vault_app/theme_provider.dart';
 
-/// Settings: change app password, switch theme (dark/system), and Exit.
+/// Settings: change app password, switch theme (dark/system), session timeout,
+/// fingerprint toggle, and Exit.
 class SettingsScreen extends StatefulWidget {
   final AuthService auth;
   final ThemeProvider theme;
@@ -18,6 +19,30 @@ class _SettingsScreenState extends State<SettingsScreen> {
   final _oldCtrl = TextEditingController();
   final _newCtrl = TextEditingController();
   String? _msg;
+  bool _biometricOn = false;
+  bool _biometricAvailable = false;
+  int _timeout = 3;
+
+  final List<int> _timeoutOptions = [3, 5, 10, 15, 30, 60, 0];
+
+  @override
+  void initState() {
+    super.initState();
+    _loadSettings();
+  }
+
+  Future<void> _loadSettings() async {
+    final on = await widget.auth.isBiometricEnabled();
+    final avail = await widget.auth.canUseBiometrics();
+    final t = await widget.auth.getTimeoutMinutes();
+    if (mounted) {
+      setState(() {
+        _biometricOn = on && avail;
+        _biometricAvailable = avail;
+        _timeout = t;
+      });
+    }
+  }
 
   Future<void> _changePassword() async {
     final oldP = _oldCtrl.text;
@@ -37,6 +62,31 @@ class _SettingsScreenState extends State<SettingsScreen> {
     _newCtrl.clear();
   }
 
+  Future<void> _toggleBiometric(bool value) async {
+    if (value && !_biometricAvailable) {
+      setState(() => _msg = 'Perangkat tidak mendukung sidik jari');
+      return;
+    }
+    if (value) {
+      final ok = await widget.auth.authenticateWithBiometrics();
+      if (!ok) {
+        setState(() => _msg = 'Verifikasi sidik jari gagal');
+        return;
+      }
+    }
+    await widget.auth.setBiometricEnabled(value);
+    if (mounted) setState(() => _biometricOn = value);
+  }
+
+  Future<void> _setTimeout(int? value) async {
+    if (value == null) return;
+    await widget.auth.setTimeoutMinutes(value);
+    if (mounted) setState(() => _timeout = value);
+    widget.auth.openSession(); // activity
+  }
+
+  String _timeoutLabel(int m) => m == 0 ? 'Selamanya' : '$m menit';
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -44,8 +94,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
       body: ListView(
         padding: const EdgeInsets.all(16),
         children: [
-          const Text('Tema',
+          const Text('Tema', style: TextStyle(fontWeight: FontWeight.bold)),
-              style: TextStyle(fontWeight: FontWeight.bold)),
           ListTile(
             title: const Text('Gelap (Dark)'),
             leading: const Icon(Icons.dark_mode),
@@ -67,6 +116,27 @@ class _SettingsScreenState extends State<SettingsScreen> {
             onTap: () => widget.theme.setMode(ThemeMode.system),
           ),
           const Divider(),
+          const Text('Session', style: TextStyle(fontWeight: FontWeight.bold)),
+          ListTile(
+            title: const Text('Timeout (tanpa aktivitas)'),
+            subtitle: Text('Logout otomatis setelah: ${_timeoutLabel(_timeout)}'),
+            trailing: DropdownButton<int>(
+              value: _timeout,
+              items: _timeoutOptions
+                  .map((m) => DropdownMenuItem(value: m, child: Text(_timeoutLabel(m))))
+                  .toList(),
+              onChanged: _setTimeout,
+            ),
+          ),
+          SwitchListTile(
+            title: const Text('Login dengan sidik jari'),
+            subtitle: Text(_biometricAvailable
+                ? 'Gunakan fingerprint untuk membuka app'
+                : 'Perangkat tidak mendukung biometrik'),
+            value: _biometricOn,
+            onChanged: _toggleBiometric,
+          ),
+          const Divider(),
           const Text('Ubah Password Aplikasi',
               style: TextStyle(fontWeight: FontWeight.bold)),
           TextField(
@@ -87,15 +157,14 @@ class _SettingsScreenState extends State<SettingsScreen> {
           if (_msg != null)
             Padding(
               padding: const EdgeInsets.only(top: 8),
-              child: Text(_msg!,
+              child: Text(_msg!, style: const TextStyle(color: Colors.green)),
-                  style: const TextStyle(color: Colors.green)),
             ),
           const Divider(),
           ListTile(
             leading: const Icon(Icons.exit_to_app),
             title: const Text('Keluar (Exit)'),
-            onTap: () {
+            onTap: () async {
-              // On Android, pop the whole stack then ask the system to close.
+              await widget.auth.closeSession();
               Navigator.of(context).popUntil((r) => r.isFirst);
               if (Platform.isAndroid) {
                 SystemNavigator.pop();

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -7,12 +7,14 @@ import Foundation
 
 import flutter_secure_storage_macos
 import google_sign_in_ios
+import local_auth_darwin
 import shared_preferences_foundation
 import sqflite_darwin
 
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   FlutterSecureStoragePlugin.register(with: registry.registrar(forPlugin: "FlutterSecureStoragePlugin"))
   FLTGoogleSignInPlugin.register(with: registry.registrar(forPlugin: "FLTGoogleSignInPlugin"))
+  LocalAuthPlugin.register(with: registry.registrar(forPlugin: "LocalAuthPlugin"))
   SharedPreferencesPlugin.register(with: registry.registrar(forPlugin: "SharedPreferencesPlugin"))
   SqflitePlugin.register(with: registry.registrar(forPlugin: "SqflitePlugin"))
 }

pubspec.lock

@@ -102,6 +102,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.2"
+  flutter_plugin_android_lifecycle:
+    dependency: transitive
+    description:
+      name: flutter_plugin_android_lifecycle
+      sha256: "3854fe5e3bff0b113c658f260b90c95dea17c92db0f2addeac2e343dd9969785"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.35"
   flutter_secure_storage:
     dependency: "direct main"
     description:
@@ -232,6 +240,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.1.2"
+  intl:
+    dependency: transitive
+    description:
+      name: intl
+      sha256: "1ca20c894b1717686a2319b8548763d812bc0aabdac580420a44c5178c57a867"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.20.3"
   jni:
     dependency: transitive
     description:
@@ -296,6 +312,46 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.0"
+  local_auth:
+    dependency: "direct main"
+    description:
+      name: local_auth
+      sha256: "434d854cf478f17f12ab29a76a02b3067f86a63a6d6c4eb8fbfdcfe4879c1b7b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.0"
+  local_auth_android:
+    dependency: transitive
+    description:
+      name: local_auth_android
+      sha256: a0bdfcc0607050a26ef5b31d6b4b254581c3d3ce3c1816ab4d4f4a9173e84467
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.56"
+  local_auth_darwin:
+    dependency: transitive
+    description:
+      name: local_auth_darwin
+      sha256: "699873970067a40ef2f2c09b4c72eb1cfef64224ef041b3df9fdc5c4c1f91f49"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.6.1"
+  local_auth_platform_interface:
+    dependency: transitive
+    description:
+      name: local_auth_platform_interface
+      sha256: f98b8e388588583d3f781f6806e4f4c9f9e189d898d27f0c249b93a1973dd122
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.0"
+  local_auth_windows:
+    dependency: transitive
+    description:
+      name: local_auth_windows
+      sha256: bc4e66a29b0fdf751aafbec923b5bed7ad6ed3614875d8151afe2578520b2ab5
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.11"
   logging:
     dependency: transitive
     description:

pubspec.yaml

@@ -16,6 +16,7 @@ dependencies:
   google_sign_in: ^6.2.1
   provider: ^6.1.2
   shared_preferences: ^2.2.2
+  local_auth: ^2.3.0
 
 dev_dependencies:
   flutter_test:

windows/flutter/generated_plugin_registrant.cc

@@ -7,8 +7,11 @@
 #include "generated_plugin_registrant.h"
 
 #include <flutter_secure_storage_windows/flutter_secure_storage_windows_plugin.h>
+#include <local_auth_windows/local_auth_plugin.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
   FlutterSecureStorageWindowsPluginRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("FlutterSecureStorageWindowsPlugin"));
+  LocalAuthPluginRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("LocalAuthPlugin"));
 }

windows/flutter/generated_plugins.cmake

@@ -4,6 +4,7 @@
 
 list(APPEND FLUTTER_PLUGIN_LIST
   flutter_secure_storage_windows
+  local_auth_windows
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST