mirror of
https://github.com/cake-tech/cake_wallet.git
synced 2024-12-26 13:39:39 +00:00
320 lines
9.5 KiB
Dart
320 lines
9.5 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'package:cw_core/crypto_currency.dart';
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import 'package:cw_core/node.dart';
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import 'package:cw_core/pathForWallet.dart';
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import 'package:cw_core/pending_transaction.dart';
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import 'package:cw_core/sync_status.dart';
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import 'package:cw_core/transaction_priority.dart';
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import 'package:cw_core/wallet_addresses.dart';
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import 'package:cw_core/wallet_base.dart';
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import 'package:cw_core/wallet_info.dart';
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import 'package:cw_ethereum/ethereum_balance.dart';
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import 'package:cw_ethereum/ethereum_client.dart';
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import 'package:cw_ethereum/ethereum_exceptions.dart';
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import 'package:cw_ethereum/ethereum_transaction_credentials.dart';
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import 'package:cw_ethereum/ethereum_transaction_history.dart';
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import 'package:cw_ethereum/ethereum_transaction_info.dart';
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import 'package:cw_ethereum/ethereum_transaction_priority.dart';
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import 'package:cw_ethereum/ethereum_wallet_addresses.dart';
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import 'package:cw_ethereum/file.dart';
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import 'package:cw_core/erc20_token.dart';
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import 'package:hive/hive.dart';
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import 'package:hex/hex.dart';
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import 'package:mobx/mobx.dart';
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import 'package:web3dart/web3dart.dart';
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import 'package:bip39/bip39.dart' as bip39;
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import 'package:bip32/bip32.dart' as bip32;
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part 'ethereum_wallet.g.dart';
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class EthereumWallet = EthereumWalletBase with _$EthereumWallet;
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abstract class EthereumWalletBase
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extends WalletBase<ERC20Balance, EthereumTransactionHistory, EthereumTransactionInfo>
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with Store {
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EthereumWalletBase({
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required WalletInfo walletInfo,
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required String mnemonic,
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required String password,
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ERC20Balance? initialBalance,
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}) : syncStatus = NotConnectedSyncStatus(),
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_password = password,
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_mnemonic = mnemonic,
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_priorityFees = [],
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_client = EthereumClient(),
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walletAddresses = EthereumWalletAddresses(walletInfo),
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balance = ObservableMap<CryptoCurrency, ERC20Balance>.of(
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{CryptoCurrency.eth: initialBalance ?? ERC20Balance(BigInt.zero)}),
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super(walletInfo) {
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this.walletInfo = walletInfo;
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if (!Hive.isAdapterRegistered(Erc20Token.typeId)) {
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Hive.registerAdapter(Erc20TokenAdapter());
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}
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}
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final String _mnemonic;
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final String _password;
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late final Box<Erc20Token> erc20TokensBox;
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late final EthPrivateKey _privateKey;
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late EthereumClient _client;
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List<int> _priorityFees;
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int? _gasPrice;
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@override
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WalletAddresses walletAddresses;
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@override
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@observable
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SyncStatus syncStatus;
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@override
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@observable
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late ObservableMap<CryptoCurrency, ERC20Balance> balance;
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Future<void> init() async {
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erc20TokensBox = await Hive.openBox<Erc20Token>(Erc20Token.boxName);
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await walletAddresses.init();
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_privateKey = await getPrivateKey(_mnemonic, _password);
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transactionHistory = EthereumTransactionHistory();
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walletAddresses.address = _privateKey.address.toString();
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}
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@override
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int calculateEstimatedFee(TransactionPriority priority, int? amount) {
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try {
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if (priority is EthereumTransactionPriority) {
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return _gasPrice! * _priorityFees[priority.raw];
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}
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return 0;
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} catch (e) {
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return 0;
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}
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}
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@override
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Future<void> changePassword(String password) {
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throw UnimplementedError("changePassword");
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}
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@override
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void close() {
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_client.stop();
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}
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@action
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@override
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Future<void> connectToNode({required Node node}) async {
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try {
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syncStatus = ConnectingSyncStatus();
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final isConnected = _client.connect(node);
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if (!isConnected) {
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throw Exception("Ethereum Node connection failed");
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}
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_client.setListeners(_privateKey.address, _onNewTransaction);
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_updateBalance();
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syncStatus = ConnectedSyncStatus();
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} catch (e) {
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syncStatus = FailedSyncStatus();
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}
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}
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@override
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Future<PendingTransaction> createTransaction(Object credentials) async {
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final _credentials = credentials as EthereumTransactionCredentials;
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final outputs = _credentials.outputs;
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final hasMultiDestination = outputs.length > 1;
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final _erc20Balance = balance[_credentials.currency]!;
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int totalAmount = 0;
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if (hasMultiDestination) {
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if (outputs.any((item) => item.sendAll || (item.formattedCryptoAmount ?? 0) <= 0)) {
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throw EthereumTransactionCreationException();
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}
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totalAmount = outputs.fold(0, (acc, value) => acc + (value.formattedCryptoAmount ?? 0));
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if (_erc20Balance.balance < EtherAmount.inWei(totalAmount as BigInt).getInWei) {
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throw EthereumTransactionCreationException();
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}
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} else {
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final output = outputs.first;
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final int allAmount = _erc20Balance.balance.toInt() - feeRate(_credentials.priority!);
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totalAmount = output.sendAll ? allAmount : output.formattedCryptoAmount ?? 0;
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if ((output.sendAll &&
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_erc20Balance.balance < EtherAmount.inWei(totalAmount as BigInt).getInWei) ||
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(!output.sendAll && _erc20Balance.balance.toInt() <= 0)) {
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throw EthereumTransactionCreationException();
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}
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}
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final pendingEthereumTransaction = await _client.signTransaction(
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privateKey: _privateKey,
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toAddress: _credentials.outputs.first.address,
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amount: totalAmount.toString(),
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gas: _priorityFees[_credentials.priority!.raw],
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priority: _credentials.priority!,
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currency: _credentials.currency,
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);
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return pendingEthereumTransaction;
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}
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@override
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Future<Map<String, EthereumTransactionInfo>> fetchTransactions() {
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throw UnimplementedError("fetchTransactions");
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}
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@override
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Object get keys => throw UnimplementedError("keys");
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@override
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Future<void> rescan({required int height}) {
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throw UnimplementedError("rescan");
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}
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@override
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Future<void> save() async {
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await walletAddresses.updateAddressesInBox();
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final path = await makePath();
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await write(path: path, password: _password, data: toJSON());
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await transactionHistory.save();
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}
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@override
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String get seed => _mnemonic;
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@action
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@override
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Future<void> startSync() async {
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try {
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syncStatus = AttemptingSyncStatus();
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await _updateBalance();
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_gasPrice = await _client.getGasUnitPrice();
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_priorityFees = await _client.getEstimatedGasForPriorities();
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Timer.periodic(
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const Duration(minutes: 1), (timer) async => _gasPrice = await _client.getGasUnitPrice());
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Timer.periodic(const Duration(minutes: 1),
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(timer) async => _priorityFees = await _client.getEstimatedGasForPriorities());
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syncStatus = SyncedSyncStatus();
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} catch (e) {
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syncStatus = FailedSyncStatus();
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}
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}
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int feeRate(TransactionPriority priority) {
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try {
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if (priority is EthereumTransactionPriority) {
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return _priorityFees[priority.raw];
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}
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return 0;
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} catch (e) {
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return 0;
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}
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}
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Future<String> makePath() async => pathForWallet(name: walletInfo.name, type: walletInfo.type);
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String toJSON() => json.encode({
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'mnemonic': _mnemonic,
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'balance': balance[currency]!.toJSON(),
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});
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static Future<EthereumWallet> open({
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required String name,
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required String password,
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required WalletInfo walletInfo,
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}) async {
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final path = await pathForWallet(name: name, type: walletInfo.type);
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final jsonSource = await read(path: path, password: password);
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final data = json.decode(jsonSource) as Map;
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final mnemonic = data['mnemonic'] as String;
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final balance = ERC20Balance.fromJSON(data['balance'] as String) ?? ERC20Balance(BigInt.zero);
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return EthereumWallet(
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walletInfo: walletInfo,
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password: password,
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mnemonic: mnemonic,
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initialBalance: balance,
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);
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}
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Future<void> _updateBalance() async {
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balance[currency] = await _fetchBalances();
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/// Get Erc20 Tokens balances
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for (var token in erc20TokensBox.values) {
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try {
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final currency = erc20Currencies.firstWhere((element) => element.title == token.symbol);
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balance[currency] =
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await _client.fetchERC20Balances(_privateKey.address, token.contractAddress);
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} catch (_) {}
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}
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await save();
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}
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Future<ERC20Balance> _fetchBalances() async {
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final balance = await _client.getBalance(_privateKey.address);
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return ERC20Balance(balance.getInWei);
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}
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Future<EthPrivateKey> getPrivateKey(String mnemonic, String password) async {
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final seed = bip39.mnemonicToSeed(mnemonic);
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final root = bip32.BIP32.fromSeed(seed);
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const _hdPathEthereum = "m/44'/60'/0'/0";
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const index = 0;
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final addressAtIndex = root.derivePath("$_hdPathEthereum/$index");
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return EthPrivateKey.fromHex(HEX.encode(addressAtIndex.privateKey as List<int>));
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}
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Future<void>? updateBalance() => null;
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List<CryptoCurrency> get erc20Currencies => erc20TokensBox.values
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.map((token) => CryptoCurrency.all.firstWhere(
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(currency) => currency.title.toLowerCase() == token.symbol.toLowerCase(),
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orElse: () => CryptoCurrency(
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name: token.name,
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title: token.symbol,
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fullName: token.name,
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),
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))
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.toList();
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Future<CryptoCurrency?> addErc20Token(String contractAddress) async {
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final token = await _client.getErc20Token(contractAddress);
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if (token == null) {
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return null;
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}
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erc20TokensBox.add(token);
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return CryptoCurrency(name: token.name, title: token.symbol, fullName: token.name);
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}
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Future<Erc20Token?> getErc20Token(String contractAddress) async =>
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await _client.getErc20Token(contractAddress);
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void _onNewTransaction(FilterEvent event) {
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_updateBalance();
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// TODO: Add in transaction history
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}
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}
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