feat(android): implement split tunneling (per-app proxy) UI

lib/data/datasources/local_sources/settings_datasource_impl.dart

@@ -1,4 +1,5 @@
 import 'package:drift/drift.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 import 'package:trusttunnel/data/database/app_database.dart' as db;
 import 'package:trusttunnel/data/datasources/settings_datasource.dart';
 
@@ -38,4 +39,40 @@ class SettingsDataSourceImpl implements SettingsDataSource {
       ),
     );
   }
+
+  @override
+  Future<void> setPerAppProxy(bool enabled) async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setBool('per_app_proxy', enabled);
+  }
+
+  @override
+  Future<bool> getPerAppProxy() async {
+    final prefs = await SharedPreferences.getInstance();
+    return prefs.getBool('per_app_proxy') ?? false;
+  }
+
+  @override
+  Future<void> setBypassApps(bool bypass) async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setBool('bypass_apps', bypass);
+  }
+
+  @override
+  Future<bool> getBypassApps() async {
+    final prefs = await SharedPreferences.getInstance();
+    return prefs.getBool('bypass_apps') ?? false;
+  }
+
+  @override
+  Future<void> setProxyApps(List<String> apps) async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setStringList('proxy_apps', apps);
+  }
+
+  @override
+  Future<List<String>> getProxyApps() async {
+    final prefs = await SharedPreferences.getInstance();
+    return prefs.getStringList('proxy_apps') ?? [];
+  }
 }

lib/data/datasources/native_sources/vpn_datasource_impl.dart

@@ -4,6 +4,7 @@ import 'package:trusttunnel/common/extensions/model_extensions.dart';
 import 'package:trusttunnel/common/utils/upstream_protocol_encoder.dart';
 import 'package:trusttunnel/common/utils/validation_utils.dart';
 import 'package:trusttunnel/common/utils/vpn_mode_encoder.dart';
+import 'package:trusttunnel/data/datasources/settings_datasource.dart';
 import 'package:trusttunnel/data/datasources/vpn_datasource.dart';
 import 'package:trusttunnel/data/model/routing_mode.dart';
 import 'package:trusttunnel/data/model/routing_profile_data.dart';
@@ -33,11 +34,14 @@ import 'package:vpn_plugin/vpn_plugin.dart';
 /// {@endtemplate}
 class VpnDataSourceImpl implements VpnDataSource {
   final VpnPlugin _platformApi;
+  final SettingsDataSource _settingsDataSource;
 
   /// {@macro vpn_data_source_impl}
   VpnDataSourceImpl({
     required VpnPlugin vpnPlugin,
-  }) : _platformApi = vpnPlugin;
+    required SettingsDataSource settingsDataSource,
+  })  : _platformApi = vpnPlugin,
+        _settingsDataSource = settingsDataSource;
 
   /// {@macro vpn_data_source_state_stream}
   ///
@@ -84,7 +88,7 @@ class VpnDataSourceImpl implements VpnDataSource {
     required ServerData server,
     required RoutingProfileData routingProfile,
     required List<String> excludedRoutes,
-  }) {
+  }) async {
     final exclusions = _getExclusionsByMode(routingProfile);
 
     final endPoint = Endpoint(
@@ -106,6 +110,10 @@ class VpnDataSourceImpl implements VpnDataSource {
       ),
     );
 
+    final perAppProxy = await _settingsDataSource.getPerAppProxy();
+    final bypassApps = await _settingsDataSource.getBypassApps();
+    final proxyApps = await _settingsDataSource.getProxyApps();
+
     return _platformApi.start(
       configuration: Configuration(
         vpnMode: VpnModeEncoder().convert(
@@ -114,6 +122,9 @@ class VpnDataSourceImpl implements VpnDataSource {
         endpoint: endPoint,
         tun: Tun(
           excludedRoutes: excludedRoutes,
+          perAppProxy: perAppProxy,
+          bypassApps: bypassApps,
+          proxyApps: proxyApps,
         ),
         socks: const Socks(),
       ),
@@ -139,7 +150,7 @@ class VpnDataSourceImpl implements VpnDataSource {
     required ServerData server,
     required RoutingProfileData routingProfile,
     required List<String> excludedRoutes,
-  }) {
+  }) async {
     final exclusions = _getExclusionsByMode(routingProfile);
 
     final endPoint = Endpoint(
@@ -161,6 +172,10 @@ class VpnDataSourceImpl implements VpnDataSource {
       clientRandom: server.tlsPrefix ?? '',
     );
 
+    final perAppProxy = await _settingsDataSource.getPerAppProxy();
+    final bypassApps = await _settingsDataSource.getBypassApps();
+    final proxyApps = await _settingsDataSource.getProxyApps();
+
     return _platformApi.updateConfiguration(
       configuration: Configuration(
         vpnMode: VpnModeEncoder().convert(
@@ -169,6 +184,9 @@ class VpnDataSourceImpl implements VpnDataSource {
         endpoint: endPoint,
         tun: Tun(
           excludedRoutes: excludedRoutes,
+          perAppProxy: perAppProxy,
+          bypassApps: bypassApps,
+          proxyApps: proxyApps,
         ),
         socks: const Socks(),
       ),

lib/data/datasources/settings_datasource.dart

@@ -17,4 +17,13 @@ abstract class SettingsDataSource {
   /// Loads the currently stored excluded routes list.
   /// {@endtemplate}
   Future<List<String>> getExcludedRoutes();
+
+  Future<void> setPerAppProxy(bool enabled);
+  Future<bool> getPerAppProxy();
+
+  Future<void> setBypassApps(bool bypass);
+  Future<bool> getBypassApps();
+
+  Future<void> setProxyApps(List<String> apps);
+  Future<List<String>> getProxyApps();
 }

lib/data/repository/settings_repository.dart

@@ -6,6 +6,15 @@ abstract class SettingsRepository {
   Future<void> setExcludedRoutes(List<String> routes);
 
   Future<List<String>> getExcludedRoutes();
+
+  Future<void> setPerAppProxy(bool enabled);
+  Future<bool> getPerAppProxy();
+
+  Future<void> setBypassApps(bool bypass);
+  Future<bool> getBypassApps();
+
+  Future<void> setProxyApps(List<String> apps);
+  Future<List<String>> getProxyApps();
 }
 
 class SettingsRepositoryImpl implements SettingsRepository {
@@ -20,4 +29,22 @@ class SettingsRepositoryImpl implements SettingsRepository {
 
   @override
   Future<void> setExcludedRoutes(List<String> routes) => _settingsDataSource.setExcludedRoutes(routes);
+
+  @override
+  Future<void> setPerAppProxy(bool enabled) => _settingsDataSource.setPerAppProxy(enabled);
+
+  @override
+  Future<bool> getPerAppProxy() => _settingsDataSource.getPerAppProxy();
+
+  @override
+  Future<void> setBypassApps(bool bypass) => _settingsDataSource.setBypassApps(bypass);
+
+  @override
+  Future<bool> getBypassApps() => _settingsDataSource.getBypassApps();
+
+  @override
+  Future<void> setProxyApps(List<String> apps) => _settingsDataSource.setProxyApps(apps);
+
+  @override
+  Future<List<String>> getProxyApps() => _settingsDataSource.getProxyApps();
 }

lib/di/model/dependency_factory.dart

@@ -79,7 +79,10 @@ class DependencyFactoryImpl implements DependencyFactory {
   );
 
   @override
-  VpnDataSource get vpnDataSource => _vpnDataSource ??= VpnDataSourceImpl(vpnPlugin: vpnPlugin);
+  VpnDataSource get vpnDataSource => _vpnDataSource ??= VpnDataSourceImpl(
+    vpnPlugin: vpnPlugin,
+    settingsDataSource: settingsDataSource,
+  );
 
   @override
   CertificateDataSource get certificateDataSource => _certificateDataSource ??= CertificateDataSourceImpl(