Implement restore wallet from seed functionality

cw_ethereum/lib/ethereum_wallet_service.dart

@@ -1,13 +1,11 @@
 import 'dart:io';
 
-import 'package:cw_core/balance.dart';
 import 'package:cw_core/pathForWallet.dart';
-import 'package:cw_core/transaction_history.dart';
-import 'package:cw_core/transaction_info.dart';
 import 'package:cw_core/wallet_base.dart';
 import 'package:cw_core/wallet_info.dart';
 import 'package:cw_core/wallet_service.dart';
 import 'package:cw_core/wallet_type.dart';
+import 'package:cw_ethereum/ethereum_mnemonics.dart';
 import 'package:cw_ethereum/ethereum_wallet.dart';
 import 'package:cw_ethereum/ethereum_wallet_creation_credentials.dart';
 import 'package:hive/hive.dart';
@@ -62,15 +60,26 @@ class EthereumWalletService extends WalletService<EthereumNewWalletCredentials,
       File(await pathForWalletDir(name: wallet, type: getType())).delete(recursive: true);
 
   @override
-  Future<WalletBase<Balance, TransactionHistoryBase<TransactionInfo>, TransactionInfo>>
-      restoreFromKeys(credentials) {
+  Future<EthereumWallet> restoreFromKeys(credentials) {
     throw UnimplementedError();
   }
 
   @override
-  Future<WalletBase<Balance, TransactionHistoryBase<TransactionInfo>, TransactionInfo>>
-      restoreFromSeed(credentials) {
-    // TODO: implement restoreFromSeed
-    throw UnimplementedError();
+  Future<EthereumWallet> restoreFromSeed(
+      EthereumRestoreWalletFromSeedCredentials credentials) async {
+    if (!bip39.validateMnemonic(credentials.mnemonic)) {
+      throw EthereumMnemonicIsIncorrectException();
+    }
+
+    final wallet = await EthereumWallet(
+      password: credentials.password!,
+      mnemonic: credentials.mnemonic,
+      walletInfo: credentials.walletInfo!,
+    );
+
+    await wallet.init();
+    await wallet.save();
+
+    return wallet;
   }
 }

lib/ethereum/cw_ethereum.dart

@@ -11,9 +11,17 @@ class CWEthereum extends Ethereum {
   WalletCredentials createEthereumNewWalletCredentials({
     required String name,
     WalletInfo? walletInfo,
-  }) {
-    return EthereumNewWalletCredentials(name: name, walletInfo: walletInfo);
-  }
+  }) =>
+      EthereumNewWalletCredentials(name: name, walletInfo: walletInfo);
 
+  @override
+  WalletCredentials createEthereumRestoreWalletFromSeedCredentials({
+    required String name,
+    required String mnemonic,
+    required String password,
+  }) =>
+      EthereumRestoreWalletFromSeedCredentials(name: name, password: password, mnemonic: mnemonic);
+
+  @override
   String getAddress(WalletBase wallet) => (wallet as EthereumWallet).walletAddresses.address;
 }

lib/view_model/wallet_restore_view_model.dart

@@ -1,6 +1,5 @@
 import 'package:cake_wallet/bitcoin/bitcoin.dart';
-import 'package:cake_wallet/core/mnemonic_length.dart';
-import 'package:flutter/foundation.dart';
+import 'package:cake_wallet/ethereum/ethereum.dart';
 import 'package:hive/hive.dart';
 import 'package:mobx/mobx.dart';
 import 'package:cake_wallet/store/app_store.dart';
@@ -84,6 +83,11 @@ abstract class WalletRestoreViewModelBase extends WalletCreationVM with Store {
               height: height,
               mnemonic: seed,
               password: password);
+        case WalletType.ethereum:
+          return ethereum!.createEthereumRestoreWalletFromSeedCredentials(
+              name: name,
+              mnemonic: seed,
+              password: password);
         default:
           break;
       }

tool/configure.dart

@@ -493,6 +493,7 @@ abstract class Ethereum {
   List<String> getEthereumWordList(String language);
   WalletService createEthereumWalletService(Box<WalletInfo> walletInfoSource);
   WalletCredentials createEthereumNewWalletCredentials({required String name, WalletInfo? walletInfo});
+  WalletCredentials createEthereumRestoreWalletFromSeedCredentials({required String name, required String mnemonic, required String password});
   String getAddress(WalletBase wallet);
 }
   """;