feat: Implement app lock

lib/config/setting_keys.dart

@@ -11,4 +11,5 @@ abstract class SettingKeys {
   static const String showNoGoogle = 'chat.fluffy.show_no_google';
   static const String showNoPid = 'chat.fluffy.show_no_pid';
   static const String databasePassword = 'database-password';
+  static const String appLockKey = 'chat.fluffy.app_lock';
 }

lib/l10n/intl_en.arb

@@ -1604,6 +1604,26 @@
     "type": "text",
     "placeholders": {}
   },
+  "pleaseEnter4Digits": "Please enter 4 digits or leave empty to disable app lock.",
+  "@pleaseEnter4Digits": {
+    "type": "text",
+    "placeholders": {}
+  },
+  "pleaseChooseAPasscode": "Please choose a pass code",
+  "@pleaseChooseAPasscode": {
+    "type": "text",
+    "placeholders": {}
+  },
+  "appLock": "App lock",
+  "@appLock": {
+    "type": "text",
+    "placeholders": {}
+  },
+  "security": "Security",
+  "@security": {
+    "type": "text",
+    "placeholders": {}
+  },
   "sourceCode": "Source code",
   "@sourceCode": {
     "type": "text",

lib/main.dart

@@ -5,11 +5,14 @@ import 'package:adaptive_theme/adaptive_theme.dart';
 import 'package:adaptive_page_layout/adaptive_page_layout.dart';
 import 'package:famedlysdk/famedlysdk.dart';
 import 'package:fluffychat/config/routes.dart';
+import 'package:fluffychat/utils/platform_infos.dart';
 import 'package:fluffychat/utils/sentry_controller.dart';
+import 'package:fluffychat/views/lock_screen.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:flutter_app_lock/flutter_app_lock.dart';
 import 'package:flutter_gen/gen_l10n/l10n.dart';
 import 'package:universal_html/prefer_universal/html.dart' as html;
 
@@ -23,7 +26,12 @@ void main() async {
   FlutterError.onError = (FlutterErrorDetails details) =>
       Zone.current.handleUncaughtError(details.exception, details.stack);
   runZonedGuarded(
-    () => runApp(App()),
+    () => runApp(PlatformInfos.isMobile
+        ? AppLock(
+            builder: (args) => App(),
+            lockScreen: LockScreen(),
+          )
+        : App()),
     SentryController.captureException,
   );
 }

lib/views/loading_view.dart

@@ -9,10 +9,6 @@ class LoadingView extends StatelessWidget {
       WidgetsBinding.instance.addPostFrameCallback((_) =>
           AdaptivePageLayout.of(context).pushNamedAndRemoveAllOthers('/'));
     }
-    return Scaffold(
-      body: Center(
-        child: CircularProgressIndicator(),
-      ),
-    );
+    return Scaffold(body: Center(child: CircularProgressIndicator()));
   }
 }

lib/views/lock_screen.dart

@@ -0,0 +1,35 @@
+import 'package:fluffychat/config/setting_keys.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_app_lock/flutter_app_lock.dart';
+import 'package:flutter_screen_lock/lock_screen.dart';
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+
+class LockScreen extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return FutureBuilder<String>(
+      future: FlutterSecureStorage().read(key: SettingKeys.appLockKey),
+      builder: (context, snapshot) {
+        if (snapshot.hasError) {
+          return Scaffold(body: Center(child: Text(snapshot.error.toString())));
+        }
+        if (snapshot.connectionState == ConnectionState.done) {
+          WidgetsBinding.instance.addPostFrameCallback((_) {
+            if (snapshot.data?.isNotEmpty ?? false) {
+              showLockScreen(
+                context: context,
+                correctString: snapshot.data,
+                onUnlocked: () => AppLock.of(context).didUnlock(),
+                canBiometric: true,
+                canCancel: false,
+              );
+            } else {
+              AppLock.of(context).didUnlock();
+            }
+          });
+        }
+        return Scaffold(body: Center(child: CircularProgressIndicator()));
+      },
+    );
+  }
+}

lib/views/settings.dart

@@ -12,6 +12,8 @@ import 'package:fluffychat/utils/platform_infos.dart';
 import 'package:fluffychat/utils/sentry_controller.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_gen/gen_l10n/l10n.dart';
+import 'package:flutter_screen_lock/lock_screen.dart';
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:image_picker/image_picker.dart';
 import 'package:url_launcher/url_launcher.dart';
 
@@ -254,6 +256,44 @@ class _SettingsState extends State<Settings> {
     }
   }
 
+  void _setAppLockAction(BuildContext context) async {
+    final currentLock =
+        await FlutterSecureStorage().read(key: SettingKeys.appLockKey);
+    if (currentLock?.isNotEmpty ?? false) {
+      var unlocked = false;
+      await showLockScreen(
+        context: context,
+        correctString: currentLock,
+        onUnlocked: () => unlocked = true,
+        canBiometric: true,
+      );
+      if (unlocked != true) return;
+    }
+    final newLock = await showTextInputDialog(
+      context: context,
+      title: L10n.of(context).pleaseChooseAPasscode,
+      message: L10n.of(context).pleaseEnter4Digits,
+      textFields: [
+        DialogTextField(
+          validator: (text) {
+            if (text.length != 4 && text.isNotEmpty) {
+              return L10n.of(context).pleaseEnter4Digits;
+            }
+            return null;
+          },
+          keyboardType: TextInputType.number,
+          obscureText: true,
+          maxLines: 1,
+          minLines: 1,
+        )
+      ],
+    );
+    if (newLock != null) {
+      await FlutterSecureStorage()
+          .write(key: SettingKeys.appLockKey, value: newLock.first);
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     final client = Matrix.of(context).client;
@@ -439,13 +479,19 @@ class _SettingsState extends State<Settings> {
               Divider(thickness: 1),
               ListTile(
                 title: Text(
-                  L10n.of(context).encryption,
+                  L10n.of(context).security,
                   style: TextStyle(
                     color: Theme.of(context).primaryColor,
                     fontWeight: FontWeight.bold,
                   ),
                 ),
               ),
+              if (PlatformInfos.isMobile)
+                ListTile(
+                  trailing: Icon(Icons.lock_outlined),
+                  title: Text(L10n.of(context).appLock),
+                  onTap: () => _setAppLockAction(context),
+                ),
               ListTile(
                 trailing: Icon(Icons.compare_arrows_outlined),
                 title: Text(client.encryption.crossSigning.enabled

pubspec.lock

@@ -309,6 +309,13 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_app_lock:
+    dependency: "direct main"
+    description:
+      name: flutter_app_lock
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.4.0+1"
   flutter_blurhash:
     dependency: "direct main"
     description:
@@ -398,6 +405,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.11"
+  flutter_screen_lock:
+    dependency: "direct main"
+    description:
+      name: flutter_screen_lock
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.2.6"
   flutter_secure_storage:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -69,6 +69,8 @@ dependencies:
   emoji_picker: ^0.1.0
   future_loading_dialog: ^0.1.2
   package_info: ^0.4.3+2
+  flutter_app_lock: ^1.4.0+1
+  flutter_screen_lock: ^1.2.6
 
 dev_dependencies:
   flutter_test: