bitcoin restore bug fix and move restore code into view model

lib/bitcoin/cw_bitcoin.dart

@@ -287,6 +287,10 @@ class CWBitcoin extends Bitcoin {
   }) async {
     List<DerivationInfo> list = [];
 
+    if (!validateMnemonic(mnemonic) && !bip39.validateMnemonic(mnemonic)) {
+      throw BitcoinMnemonicIsIncorrectException();
+    }
+
     List<DerivationType> types = await compareDerivationMethods(mnemonic: mnemonic, node: node);
     if (types.length == 1 && types.first == DerivationType.electrum) {
       return [

lib/src/screens/restore/wallet_restore_page.dart

@@ -96,9 +96,6 @@ class WalletRestorePage extends BasePage {
   final GlobalKey<WalletRestoreFromSeedFormState> walletRestoreFromSeedFormKey;
   final GlobalKey<WalletRestoreFromKeysFromState> walletRestoreFromKeysFormKey;
   final FocusNode _blockHeightFocusNode;
-
-  // DerivationType derivationType = DerivationType.unknown;
-  // String? derivationPath = null;
   DerivationInfo? derivationInfo;
 
   @override
@@ -322,7 +319,6 @@ class WalletRestorePage extends BasePage {
       }
     }
 
-    credentials['derivationInfo'] = this.derivationInfo;
     credentials['walletType'] = walletRestoreViewModel.type;
     return credentials;
   }
@@ -353,50 +349,10 @@ class WalletRestorePage extends BasePage {
       return;
     }
 
-    walletRestoreViewModel.state = IsExecutingState();
+    dynamic creds = _credentials();
-
+    creds['derivationInfo'] = await walletRestoreViewModel.getFinalDerivationInfo(context, creds);
-    DerivationInfo? dInfo;
+    
-
+    walletRestoreViewModel.create(options: creds);
-    // get info about the different derivations:
-    List<DerivationInfo> derivations =
-        await walletRestoreViewModel.getDerivationInfo(_credentials());
-
-    int derivationsWithHistory = 0;
-    int derivationWithHistoryIndex = 0;
-    for (int i = 0; i < derivations.length; i++) {
-      if (derivations[i].transactionsCount > 0) {
-        derivationsWithHistory++;
-        derivationWithHistoryIndex = i;
-      }
-    }
-
-    if (derivationsWithHistory > 1) {
-      dInfo = await Navigator.of(context).pushNamed(
-        Routes.restoreWalletChooseDerivation,
-        arguments: derivations,
-      ) as DerivationInfo?;
-    } else if (derivationsWithHistory == 1) {
-      dInfo = derivations[derivationWithHistoryIndex];
-    }
-
-    // get the default derivation for this wallet type:
-    if (dInfo == null) {
-      // we only return 1 derivation if we're pretty sure we know which one to use:
-      if (derivations.length == 1) {
-        dInfo = derivations.first;
-      } else {
-        // if we have multiple possible derivations, and none have histories
-        // we just default to the most common one:
-        dInfo = walletRestoreViewModel.getCommonRestoreDerivation();
-      }
-    }
-
-    this.derivationInfo = dInfo;
-    if (this.derivationInfo == null) {
-      this.derivationInfo = walletRestoreViewModel.getDefaultDerivation();
-    }
-
-    walletRestoreViewModel.create(options: _credentials());
   }
 
   Future<void> showNameExistsAlert(BuildContext context) {

lib/view_model/wallet_restore_view_model.dart

@@ -1,12 +1,15 @@
 import 'package:cake_wallet/bitcoin/bitcoin.dart';
+import 'package:cake_wallet/core/execution_state.dart';
 import 'package:cake_wallet/di.dart';
 import 'package:cake_wallet/nano/nano.dart';
 import 'package:cake_wallet/ethereum/ethereum.dart';
+import 'package:cake_wallet/routes.dart';
 import 'package:cw_core/nano_account_info_response.dart';
 import 'package:cake_wallet/bitcoin_cash/bitcoin_cash.dart';
 import 'package:cake_wallet/polygon/polygon.dart';
 import 'package:cake_wallet/solana/solana.dart';
 import 'package:cake_wallet/tron/tron.dart';
+import 'package:flutter/material.dart';
 import 'package:hive/hive.dart';
 import 'package:mobx/mobx.dart';
 import 'package:cake_wallet/store/app_store.dart';
@@ -238,6 +241,54 @@ abstract class WalletRestoreViewModelBase extends WalletCreationVM with Store {
     return list;
   }
 
+  Future<DerivationInfo?> getFinalDerivationInfo(BuildContext context, dynamic credentials) async {
+    state = IsExecutingState();
+    try {
+      DerivationInfo? dInfo;
+
+      // get info about the different derivations:
+      List<DerivationInfo> derivations = await getDerivationInfo(credentials);
+
+      int derivationsWithHistory = 0;
+      int derivationWithHistoryIndex = 0;
+      for (int i = 0; i < derivations.length; i++) {
+        if (derivations[i].transactionsCount > 0) {
+          derivationsWithHistory++;
+          derivationWithHistoryIndex = i;
+        }
+      }
+
+      if (derivationsWithHistory > 1) {
+        dInfo = await Navigator.of(context).pushNamed(
+          Routes.restoreWalletChooseDerivation,
+          arguments: derivations,
+        ) as DerivationInfo?;
+      } else if (derivationsWithHistory == 1) {
+        dInfo = derivations[derivationWithHistoryIndex];
+      }
+
+      // get the default derivation for this wallet type:
+      if (dInfo == null) {
+        // we only return 1 derivation if we're pretty sure we know which one to use:
+        if (derivations.length == 1) {
+          dInfo = derivations.first;
+        } else {
+          // if we have multiple possible derivations, and none have histories
+          // we just default to the most common one:
+          dInfo = getCommonRestoreDerivation();
+        }
+      }
+
+      if (dInfo == null) {
+        dInfo = getDefaultDerivation();
+      }
+      return dInfo;
+    } catch (e) {
+      state = FailureState(e.toString());
+      rethrow;
+    }
+  }
+
   @override
   Future<WalletBase> process(WalletCredentials credentials) async {
     if (mode == WalletRestoreMode.keys) {

tool/configure.dart

@@ -105,6 +105,7 @@ import 'package:cw_bitcoin/bitcoin_transaction_credentials.dart';
 import 'package:cw_bitcoin/litecoin_wallet_service.dart';
 import 'package:cw_bitcoin/script_hash.dart';
 import 'package:cw_bitcoin/pending_bitcoin_transaction.dart';
+import 'package:cw_bitcoin/mnemonic_is_incorrect_exception.dart';
 import 'package:mobx/mobx.dart';
 """;
   const bitcoinCwPart = "part 'cw_bitcoin.dart';";