feat: dev screen for file manager, snapshot and fuzzing

This commit adds tooling to find potential issues with code
that are difficult to notice during debugging (especially on
builds from the CI which lack debugging capabilities).

File manager supports basic operations like browsing files,
renaming, copying and removing

Snapshots allow to take a snapshot of current app data, and
compare to it later on with basic hexdump view - useful to
notice anomalies or modifications to files that shouldn't
be accessed.

File watcher checks for file modifications in real time, which
is used to see what actions are happening to the fs in real
time.

Fuzzing can be used to load/create wallets randomly to see
if any of them will get corrupted (can be used in addition
with wallet_fuzzer.sh script that kills the app and restarts
the process at random intervals to simulate unexpected action
that can happen for example in the background).

In addition I've added toString method to {bitcoin,monero,nano
,zano}_wallet_keys.dart so I can easily compare the results
when fuzzing without accessing wallet-specific code.

Author: MrCyjaneK

.gitignore

@@ -227,3 +227,6 @@ flatpak-build/
 **/linux/flutter/generated_plugin_registrant.cc
 **/linux/flutter/generated_plugin_registrant.h
 **/linux/flutter/generated_plugins.cmake
+
+
+wallet_fuzzer_data/

cw_bitcoin/lib/bitcoin_wallet_keys.dart

@@ -4,4 +4,9 @@ class BitcoinWalletKeys {
   final String wif;
   final String privateKey;
   final String publicKey;
+
+  @override
+  String toString() {
+    return 'BitcoinWalletKeys(wif: $wif, privateKey: $privateKey, publicKey: $publicKey)';
+  }
 }

cw_core/lib/monero_wallet_keys.dart

@@ -13,4 +13,9 @@ class MoneroWalletKeys {
   final String publicSpendKey;
   final String privateSpendKey;
   final String passphrase;
+
+  @override
+  String toString() {
+    return 'MoneroWalletKeys(primaryAddress: $primaryAddress, publicViewKey: $publicViewKey, privateViewKey: $privateViewKey, publicSpendKey: $publicSpendKey, privateSpendKey: $privateSpendKey, passphrase: $passphrase)';
+  }
 }

cw_nano/lib/nano_wallet_keys.dart

@@ -2,4 +2,9 @@ class NanoWalletKeys {
   const NanoWalletKeys({required this.seedKey});
 
   final String seedKey;
+
+  @override
+  String toString() {
+    return 'NanoWalletKeys(seedKey: $seedKey)';
+  }
 }

cw_zano/lib/model/zano_wallet_keys.dart

@@ -9,4 +9,9 @@ class ZanoWalletKeys {
   final String privateViewKey;
   final String publicSpendKey;
   final String privateSpendKey;
+
+  @override
+  String toString() {
+    return 'ZanoWalletKeys(publicViewKey: $publicViewKey, privateViewKey: $privateViewKey, publicSpendKey: $publicSpendKey, privateSpendKey: $privateSpendKey)';
+  }
 }

lib/di.dart

@@ -33,8 +33,10 @@ import 'package:cake_wallet/entities/exchange_api_mode.dart';
 import 'package:cake_wallet/entities/hardware_wallet/require_hardware_wallet_connection.dart';
 import 'package:cake_wallet/entities/parse_address_from_domain.dart';
 import 'package:cake_wallet/exchange/provider/trocador_exchange_provider.dart';
+import 'package:cake_wallet/src/screens/dev/file_explorer.dart';
 import 'package:cake_wallet/src/screens/dev/monero_background_sync.dart';
 import 'package:cake_wallet/src/screens/dev/moneroc_call_profiler.dart';
+import 'package:cake_wallet/src/screens/dev/wallet_fuzzer.dart';
 import 'package:cake_wallet/src/screens/settings/background_sync_page.dart';
 import 'package:cake_wallet/view_model/dev/monero_background_sync.dart';
 import 'package:cake_wallet/view_model/link_view_model.dart';
@@ -1450,5 +1452,9 @@ Future<void> setup({
 
   getIt.registerFactory(() => DevMoneroBackgroundSyncPage(getIt.get<DevMoneroBackgroundSync>()));
   getIt.registerFactory(() => DevMoneroCallProfilerPage());
+
+  getIt.registerFactory(() => FileExplorerPage());
+  getIt.registerFactory(() => WalletFuzzerPage());
+
   _isSetupFinished = true;
 }

lib/main.dart

@@ -28,8 +28,10 @@ import 'package:cake_wallet/store/authentication_store.dart';
 import 'package:cake_wallet/themes/theme_base.dart';
 import 'package:cake_wallet/utils/device_info.dart';
 import 'package:cake_wallet/utils/exception_handler.dart';
+import 'package:cake_wallet/utils/feature_flag.dart';
 import 'package:cake_wallet/view_model/link_view_model.dart';
 import 'package:cake_wallet/utils/responsive_layout_util.dart';
+import 'package:cake_wallet/view_model/dev/file_explorer.dart';
 import 'package:cw_core/address_info.dart';
 import 'package:cw_core/cake_hive.dart';
 import 'package:cw_core/hive_type_ids.dart';
@@ -63,6 +65,9 @@ Future<void> runAppWithZone({Key? topLevelKey}) async {
 
   await runZonedGuarded(() async {
     WidgetsFlutterBinding.ensureInitialized();
+    if (FeatureFlag.hasDevOptions) {
+      await checkAndStartFileMonitoring();
+    }
     FlutterError.onError = ExceptionHandler.onError;
 
     /// A callback that is invoked when an unhandled error occurs in the root
@@ -428,3 +433,15 @@ Future<void> backgroundSync() async {
     }
   }
 }
+
+Future<void> checkAndStartFileMonitoring() async {
+  try {
+    final shouldMonitor = await FileExplorerViewModelBase.checkDevMonitorFileExists();
+    if (shouldMonitor) {
+      printV('Dev file monitoring enabled, starting file system watcher...');
+      await FileExplorerViewModelBase.startMonitoring();
+    }
+  } catch (e) {
+    printV('Failed to initialize file monitoring: $e');
+  }
+}

lib/router.dart

@@ -35,8 +35,10 @@ import 'package:cake_wallet/src/screens/dashboard/pages/address_page.dart';
 import 'package:cake_wallet/src/screens/dashboard/pages/nft_details_page.dart';
 import 'package:cake_wallet/src/screens/dashboard/pages/transactions_page.dart';
 import 'package:cake_wallet/src/screens/dashboard/sign_page.dart';
+import 'package:cake_wallet/src/screens/dev/file_explorer.dart';
 import 'package:cake_wallet/src/screens/dev/monero_background_sync.dart';
 import 'package:cake_wallet/src/screens/dev/moneroc_call_profiler.dart';
+import 'package:cake_wallet/src/screens/dev/wallet_fuzzer.dart';
 import 'package:cake_wallet/src/screens/disclaimer/disclaimer_page.dart';
 import 'package:cake_wallet/src/screens/exchange/exchange_page.dart';
 import 'package:cake_wallet/src/screens/exchange/exchange_template_page.dart';
@@ -842,6 +844,16 @@ Route<dynamic> createRoute(RouteSettings settings) {
         builder: (_) => getIt.get<DevMoneroCallProfilerPage>(),
       );
 
+    case Routes.devFileExplorer:
+      return MaterialPageRoute<void>(
+        builder: (_) => getIt.get<FileExplorerPage>(),
+      );
+
+    case Routes.devWalletFuzzer:
+      return MaterialPageRoute<void>(
+        builder: (_) => getIt.get<WalletFuzzerPage>(),
+      );
+
     default:
       return MaterialPageRoute<void>(
           builder: (_) => Scaffold(

lib/routes.dart

@@ -113,6 +113,8 @@ class Routes {
   static const backgroundSync = '/background_sync';
   static const devMoneroBackgroundSync = '/dev/monero_background_sync';
   static const devMoneroCallProfiler = '/dev/monero_call_profiler';
+  static const devFileExplorer = '/dev/file_explorer';
+  static const devWalletFuzzer = '/dev/wallet_fuzzer';
   static const signPage = '/sign_page';
   static const connectDevices = '/device/connect';
   static const urqrAnimatedPage = '/urqr/animated_page';