mirror of
https://github.com/cake-tech/cake_wallet.git
synced 2024-12-26 13:39:39 +00:00
362 lines
11 KiB
Dart
362 lines
11 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 _fetchEthBalance();
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await _fetchErc20Balances();
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await save();
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}
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Future<ERC20Balance> _fetchEthBalance() 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<void> _fetchErc20Balances() async {
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for (var token in erc20TokensBox.values) {
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try {
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if (token.enabled) {
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balance[token] = await _client.fetchERC20Balances(
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_privateKey.address,
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token.contractAddress,
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);
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} else {
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balance.remove(token);
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}
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} catch (_) {}
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}
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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() async => await _updateBalance();
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List<Erc20Token> get erc20Currencies => erc20TokensBox.values.toList();
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Future<void> addErc20Token(Erc20Token token) async {
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String? iconPath;
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try {
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iconPath = CryptoCurrency.all
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.firstWhere((element) => element.title.toUpperCase() == token.symbol.toUpperCase())
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.iconPath;
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} catch (_) {}
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await erc20TokensBox.put(token.contractAddress, Erc20Token(
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name: token.name,
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symbol: token.symbol,
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contractAddress: token.contractAddress,
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decimal: token.decimal,
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enabled: token.enabled,
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iconPath: iconPath,
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));
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_updateBalance();
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}
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Future<void> deleteErc20Token(Erc20Token token) async {
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await token.delete();
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balance.remove(token);
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_updateBalance();
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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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void addInitialTokens() {
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final Map<CryptoCurrency, Map<String, dynamic>> _initialErc20Currencies = {
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CryptoCurrency.usdc: {
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'contractAddress': "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
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'decimal': 6,
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},
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CryptoCurrency.usdterc20: {
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'contractAddress': "0xdac17f958d2ee523a2206206994597c13d831ec7",
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'decimal': 6,
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},
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CryptoCurrency.dai: {
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'contractAddress': "0x6B175474E89094C44Da98b954EedeAC495271d0F",
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'decimal': 18,
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},
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};
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for (var currency in _initialErc20Currencies.keys) {
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erc20TokensBox.put(_initialErc20Currencies[currency]!['contractAddress'], Erc20Token(
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name: currency.fullName ?? currency.title,
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symbol: currency.title,
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contractAddress: _initialErc20Currencies[currency]!['contractAddress'],
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decimal: _initialErc20Currencies[currency]!['decimal'],
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enabled: true,
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iconPath: currency.iconPath,
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));
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}
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}
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}
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