Try to show seeds if wallet files gets corrupted (#1567)

* add litecoin nodes
minor ui fix

* Try to open the wallet or fetch the seeds and show them to the user

* make sure the seeds are only displayed after authentication

assets/litecoin_electrum_server_list.yml

@@ -2,3 +2,18 @@
   uri: ltc-electrum.cakewallet.com:50002
   useSSL: true
   isDefault: true
+-
+  uri: litecoin.stackwallet.com:20063
+  useSSL: true
+-
+  uri: electrum-ltc.bysh.me:50002
+  useSSL: true
+-
+  uri: lightweight.fiatfaucet.com:50002
+  useSSL: true
+-
+  uri: electrum.ltc.xurious.com:50002
+  useSSL: true
+-
+  uri: backup.electrum-ltc.org:443
+  useSSL: true

cw_core/lib/wallet_service.dart

@@ -1,6 +1,8 @@
+import 'dart:convert';
 import 'dart:io';
 
 import 'package:cw_core/pathForWallet.dart';
+import 'package:cw_core/utils/file.dart';
 import 'package:cw_core/wallet_base.dart';
 import 'package:cw_core/wallet_credentials.dart';
 import 'package:cw_core/wallet_type.dart';
@@ -42,4 +44,21 @@ abstract class WalletService<N extends WalletCredentials, RFS extends WalletCred
       await File(walletDirPath).copy(backupWalletDirPath);
     }
   }
+
+  Future<String> getSeeds(String name, String password, WalletType type) async {
+    try {
+      final path = await pathForWallet(name: name, type: type);
+      final jsonSource = await read(path: path, password: password);
+      try {
+        final data = json.decode(jsonSource) as Map;
+        return data['mnemonic'] as String? ?? '';
+      } catch (_) {
+        // if not a valid json
+        return jsonSource.substring(0, 200);
+      }
+    } catch (_) {
+      // if the file couldn't be opened or read
+      return '';
+    }
+  }
 }

cw_monero/lib/monero_wallet.dart

@@ -19,7 +19,6 @@ import 'package:cw_core/transaction_priority.dart';
 import 'package:cw_core/unspent_coins_info.dart';
 import 'package:cw_core/wallet_base.dart';
 import 'package:cw_core/wallet_info.dart';
-import 'package:cw_monero/api/account_list.dart';
 import 'package:cw_monero/api/coins_info.dart';
 import 'package:cw_monero/api/monero_output.dart';
 import 'package:cw_monero/api/structs/pending_transaction.dart';

cw_monero/lib/monero_wallet_service.dart

@@ -57,8 +57,11 @@ class MoneroRestoreWalletFromKeysCredentials extends WalletCredentials {
   final String spendKey;
 }
 
-class MoneroWalletService extends WalletService<MoneroNewWalletCredentials,
-    MoneroRestoreWalletFromSeedCredentials, MoneroRestoreWalletFromKeysCredentials, MoneroNewWalletCredentials> {
+class MoneroWalletService extends WalletService<
+    MoneroNewWalletCredentials,
+    MoneroRestoreWalletFromSeedCredentials,
+    MoneroRestoreWalletFromKeysCredentials,
+    MoneroNewWalletCredentials> {
   MoneroWalletService(this.walletInfoSource, this.unspentCoinsInfoSource);
 
   final Box<WalletInfo> walletInfoSource;
@@ -183,11 +186,8 @@ class MoneroWalletService extends WalletService<MoneroNewWalletCredentials,
       final wmaddr = wmPtr.address;
       final waddr = openedWalletsByPath["$path/$wallet"]!.address;
       // await Isolate.run(() {
-        monero.WalletManager_closeWallet(
-            Pointer.fromAddress(wmaddr),
-            Pointer.fromAddress(waddr),
-            false
-        );
+      monero.WalletManager_closeWallet(
+          Pointer.fromAddress(wmaddr), Pointer.fromAddress(waddr), false);
       // });
       openedWalletsByPath.remove("$path/$wallet");
       print("wallet closed");
@@ -248,7 +248,8 @@ class MoneroWalletService extends WalletService<MoneroNewWalletCredentials,
 
   @override
   Future<MoneroWallet> restoreFromHardwareWallet(MoneroNewWalletCredentials credentials) {
-    throw UnimplementedError("Restoring a Monero wallet from a hardware wallet is not yet supported!");
+    throw UnimplementedError(
+        "Restoring a Monero wallet from a hardware wallet is not yet supported!");
   }
 
   @override
@@ -350,4 +351,24 @@ class MoneroWalletService extends WalletService<MoneroNewWalletCredentials,
       print(e.toString());
     }
   }
+
+  @override
+  Future<String> getSeeds(String name, String password, WalletType type) async {
+    try {
+      final path = await pathForWallet(name: name, type: getType());
+
+      if (walletFilesExist(path)) {
+        await repairOldAndroidWallet(name);
+      }
+
+      await monero_wallet_manager.openWalletAsync({'path': path, 'password': password});
+      final walletInfo = walletInfoSource.values
+          .firstWhere((info) => info.id == WalletBase.idFor(name, getType()));
+      final wallet = MoneroWallet(walletInfo: walletInfo, unspentCoinsInfo: unspentCoinsInfoSource);
+      return wallet.seed;
+    } catch (_) {
+      // if the file couldn't be opened or read
+      return '';
+    }
+  }
 }

lib/core/wallet_loading_service.dart

@@ -1,6 +1,9 @@
+import 'dart:async';
+
 import 'package:cake_wallet/core/generate_wallet_password.dart';
 import 'package:cake_wallet/core/key_service.dart';
 import 'package:cake_wallet/entities/preferences_key.dart';
+import 'package:cake_wallet/reactions/on_authentication_state_change.dart';
 import 'package:cake_wallet/utils/exception_handler.dart';
 import 'package:cw_core/cake_hive.dart';
 import 'package:cw_core/wallet_base.dart';
@@ -52,6 +55,12 @@ class WalletLoadingService {
     } catch (error, stack) {
       ExceptionHandler.onError(FlutterErrorDetails(exception: error, stack: stack));
 
+      // try fetching the seeds of the corrupted wallet to show it to the user
+      String corruptedWalletsSeeds = "Corrupted wallets seeds (if retrievable, empty otherwise):";
+      try {
+        corruptedWalletsSeeds += await _getCorruptedWalletSeeds(name, type);
+      } catch (_) {}
+
       // try opening another wallet that is not corrupted to give user access to the app
       final walletInfoSource = await CakeHive.openBox<WalletInfo>(WalletInfo.boxName);
 
@@ -69,12 +78,23 @@ class WalletLoadingService {
           await sharedPreferences.setInt(
               PreferencesKey.currentWalletType, serializeToInt(wallet.type));
 
+          // if found a wallet that is not corrupted, then still display the seeds of the corrupted ones
+          authenticatedErrorStreamController.add(corruptedWalletsSeeds);
+
           return wallet;
-        } catch (_) {}
+        } catch (_) {
+          // save seeds and show corrupted wallets' seeds to the user
+          try {
+            final seeds = await _getCorruptedWalletSeeds(walletInfo.name, walletInfo.type);
+            if (!corruptedWalletsSeeds.contains(seeds)) {
+              corruptedWalletsSeeds += seeds;
+            }
+          } catch (_) {}
+        }
       }
 
       // if all user's wallets are corrupted throw exception
-      throw error;
+      throw error.toString() + "\n\n" + corruptedWalletsSeeds;
     }
   }
 
@@ -96,4 +116,11 @@ class WalletLoadingService {
     isPasswordUpdated = true;
     await sharedPreferences.setBool(key, isPasswordUpdated);
   }
+
+  Future<String> _getCorruptedWalletSeeds(String name, WalletType type) async {
+    final walletService = walletServiceFactory.call(type);
+    final password = await keyService.getWalletPassword(walletName: name);
+
+    return "\n\n$type ($name): ${await walletService.getSeeds(name, password, type)}";
+  }
 }

lib/di.dart

@@ -1,3 +1,5 @@
+import 'dart:async' show Timer;
+
 import 'package:cake_wallet/.secrets.g.dart' as secrets;
 import 'package:cake_wallet/anonpay/anonpay_api.dart';
 import 'package:cake_wallet/anonpay/anonpay_info_base.dart';
@@ -487,6 +489,7 @@ Future<void> setup({
 
         if (loginError != null) {
           authPageState.changeProcessText('ERROR: ${loginError.toString()}');
+          loginError = null;
         }
 
         ReactionDisposer? _reaction;
@@ -498,6 +501,17 @@ Future<void> setup({
             linkViewModel.handleLink();
           }
         });
+
+        Timer.periodic(Duration(seconds: 1), (timer) {
+          if (timer.tick > 30) {
+            timer.cancel();
+          }
+
+          if (loginError != null) {
+            authPageState.changeProcessText('ERROR: ${loginError.toString()}');
+            timer.cancel();
+          }
+        });
       }
     });
   });

lib/reactions/on_authentication_state_change.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:cake_wallet/routes.dart';
 import 'package:cake_wallet/utils/exception_handler.dart';
 import 'package:flutter/widgets.dart';
@@ -8,9 +10,16 @@ import 'package:cake_wallet/store/authentication_store.dart';
 ReactionDisposer? _onAuthenticationStateChange;
 
 dynamic loginError;
+StreamController<dynamic> authenticatedErrorStreamController = StreamController<dynamic>();
 
 void startAuthenticationStateChange(
     AuthenticationStore authenticationStore, GlobalKey<NavigatorState> navigatorKey) {
+  authenticatedErrorStreamController.stream.listen((event) {
+    if (authenticationStore.state == AuthenticationState.allowed) {
+      ExceptionHandler.showError(event.toString(), delayInSeconds: 3);
+    }
+  });
+
   _onAuthenticationStateChange ??= autorun((_) async {
     final state = authenticationStore.state;
 
@@ -26,6 +35,11 @@ void startAuthenticationStateChange(
 
     if (state == AuthenticationState.allowed) {
       await navigatorKey.currentState!.pushNamedAndRemoveUntil(Routes.dashboard, (route) => false);
+      if (!(await authenticatedErrorStreamController.stream.isEmpty)) {
+        ExceptionHandler.showError(
+            (await authenticatedErrorStreamController.stream.first).toString());
+        authenticatedErrorStreamController.stream.drain();
+      }
       return;
     }
   });

lib/src/screens/monero_accounts/monero_account_edit_or_create_page.dart

@@ -51,7 +51,9 @@ class MoneroAccountEditOrCreatePage extends BasePage {
 
                           await moneroAccountCreationViewModel.save();
 
-                          Navigator.of(context).pop(_textController.text);
+                          if (context.mounted) {
+                            Navigator.of(context).pop(_textController.text);
+                          }
                         },
                         text: moneroAccountCreationViewModel.isEdit
                             ? S.of(context).rename

lib/utils/exception_handler.dart

@@ -4,11 +4,13 @@ import 'package:cake_wallet/entities/preferences_key.dart';
 import 'package:cake_wallet/generated/i18n.dart';
 import 'package:cake_wallet/main.dart';
 import 'package:cake_wallet/src/widgets/alert_with_two_actions.dart';
+import 'package:cake_wallet/utils/show_bar.dart';
 import 'package:cake_wallet/utils/show_pop_up.dart';
 import 'package:cw_core/root_dir.dart';
 import 'package:device_info_plus/device_info_plus.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_mailer/flutter_mailer.dart';
 import 'package:cake_wallet/utils/package_info.dart';
 import 'package:shared_preferences/shared_preferences.dart';
@@ -254,4 +256,53 @@ class ExceptionHandler {
       'productName': data.productName,
     };
   }
+
+  static void showError(String error, {int? delayInSeconds}) async {
+    if (_hasError) {
+      return;
+    }
+    _hasError = true;
+
+    if (delayInSeconds != null) {
+      Future.delayed(Duration(seconds: delayInSeconds), () => _showCopyPopup(error));
+      return;
+    }
+
+    WidgetsBinding.instance.addPostFrameCallback(
+      (_) async => _showCopyPopup(error),
+    );
+  }
+
+  static Future<void> _showCopyPopup(String content) async {
+    if (navigatorKey.currentContext != null) {
+      final shouldCopy = await showPopUp<bool?>(
+        context: navigatorKey.currentContext!,
+        builder: (context) {
+          return AlertWithTwoActions(
+            isDividerExist: true,
+            alertTitle: S.of(context).error,
+            alertContent: content,
+            rightButtonText: S.of(context).copy,
+            leftButtonText: S.of(context).close,
+            actionRightButton: () {
+              Navigator.of(context).pop(true);
+            },
+            actionLeftButton: () {
+              Navigator.of(context).pop();
+            },
+          );
+        },
+      );
+
+      if (shouldCopy == true) {
+        await Clipboard.setData(ClipboardData(text: content));
+        await showBar<void>(
+          navigatorKey.currentContext!,
+          S.of(navigatorKey.currentContext!).copied_to_clipboard,
+        );
+      }
+    }
+
+    _hasError = false;
+  }
 }