mirror of
https://github.com/cake-tech/cake_wallet.git
synced 2024-12-23 20:19:25 +00:00
518 lines
16 KiB
Dart
518 lines
16 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'dart:io';
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import 'dart:math';
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import 'package:cw_core/crypto_currency.dart';
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import 'package:cw_core/cake_hive.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_direction.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/default_erc20_tokens.dart';
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import 'package:cw_ethereum/encryption_file_utils.dart';
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import 'package:cw_ethereum/erc20_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_formatter.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_model.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_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:shared_preferences/shared_preferences.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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String? mnemonic,
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String? privateKey,
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required String password,
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required EncryptionFileUtils encryptionFileUtils,
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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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_hexPrivateKey = privateKey,
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_isTransactionUpdating = false,
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_encryptionFileUtils = encryptionFileUtils,
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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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transactionHistory = EthereumTransactionHistory(
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walletInfo: walletInfo,
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password: password,
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encryptionFileUtils: encryptionFileUtils,
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);
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if (!CakeHive.isAdapterRegistered(Erc20Token.typeId)) {
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CakeHive.registerAdapter(Erc20TokenAdapter());
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}
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_sharedPrefs.complete(SharedPreferences.getInstance());
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}
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final String? _mnemonic;
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final String? _hexPrivateKey;
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final String _password;
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final EncryptionFileUtils _encryptionFileUtils;
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late final Box<Erc20Token> erc20TokensBox;
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late final EthPrivateKey _ethPrivateKey;
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late EthereumClient _client;
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int? _gasPrice;
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int? _estimatedGas;
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bool _isTransactionUpdating;
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// TODO: remove after integrating our own node and having eth_newPendingTransactionFilter
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Timer? _transactionsUpdateTimer;
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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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Completer<SharedPreferences> _sharedPrefs = Completer();
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Future<void> init() async {
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erc20TokensBox = await CakeHive.openBox<Erc20Token>(Erc20Token.boxName);
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await walletAddresses.init();
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await transactionHistory.init();
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_ethPrivateKey = await getPrivateKey(
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mnemonic: _mnemonic,
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privateKey: _hexPrivateKey,
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password: _password,
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);
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walletAddresses.address = _ethPrivateKey.address.toString();
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await save();
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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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final priorityFee = EtherAmount.fromInt(EtherUnit.gwei, priority.tip).getInWei.toInt();
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return (_gasPrice! + priorityFee) * (_estimatedGas ?? 0);
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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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_transactionsUpdateTimer?.cancel();
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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(_ethPrivateKey.address, _onNewTransaction);
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_setTransactionUpdateTimer();
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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 CryptoCurrency transactionCurrency =
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balance.keys.firstWhere((element) => element.title == _credentials.currency.title);
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final _erc20Balance = balance[transactionCurrency]!;
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BigInt totalAmount = BigInt.zero;
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int exponent = transactionCurrency is Erc20Token ? transactionCurrency.decimal : 18;
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num amountToEthereumMultiplier = pow(10, exponent);
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// so far this can not be made with Ethereum as Ethereum does not support multiple recipients
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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(transactionCurrency);
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}
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final totalOriginalAmount = EthereumFormatter.parseEthereumAmountToDouble(
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outputs.fold(0, (acc, value) => acc + (value.formattedCryptoAmount ?? 0)));
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totalAmount = BigInt.from(totalOriginalAmount * amountToEthereumMultiplier);
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if (_erc20Balance.balance < totalAmount) {
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throw EthereumTransactionCreationException(transactionCurrency);
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}
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} else {
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final output = outputs.first;
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// since the fees are taken from Ethereum
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// then no need to subtract the fees from the amount if send all
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final BigInt allAmount;
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if (transactionCurrency is Erc20Token) {
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allAmount = _erc20Balance.balance;
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} else {
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allAmount = _erc20Balance.balance -
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BigInt.from(calculateEstimatedFee(_credentials.priority!, null));
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}
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final totalOriginalAmount =
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EthereumFormatter.parseEthereumAmountToDouble(output.formattedCryptoAmount ?? 0);
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totalAmount = output.sendAll
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? allAmount
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: BigInt.from(totalOriginalAmount * amountToEthereumMultiplier);
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if (_erc20Balance.balance < totalAmount) {
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throw EthereumTransactionCreationException(transactionCurrency);
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}
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}
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final pendingEthereumTransaction = await _client.signTransaction(
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privateKey: _ethPrivateKey,
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toAddress: _credentials.outputs.first.isParsedAddress
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? _credentials.outputs.first.extractedAddress!
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: _credentials.outputs.first.address,
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amount: totalAmount.toString(),
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gas: _estimatedGas!,
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priority: _credentials.priority!,
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currency: transactionCurrency,
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exponent: exponent,
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contractAddress:
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transactionCurrency is Erc20Token ? transactionCurrency.contractAddress : null,
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);
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return pendingEthereumTransaction;
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}
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Future<void> _updateTransactions() async {
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try {
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if (_isTransactionUpdating) {
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return;
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}
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bool isEtherscanEnabled = (await _sharedPrefs.future).getBool("use_etherscan") ?? true;
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if (!isEtherscanEnabled) {
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return;
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}
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_isTransactionUpdating = true;
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final transactions = await fetchTransactions();
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transactionHistory.addMany(transactions);
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await transactionHistory.save();
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_isTransactionUpdating = false;
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} catch (_) {
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_isTransactionUpdating = false;
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}
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}
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@override
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Future<Map<String, EthereumTransactionInfo>> fetchTransactions() async {
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final address = _ethPrivateKey.address.hex;
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final transactions = await _client.fetchTransactions(address);
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final List<Future<List<EthereumTransactionModel>>> erc20TokensTransactions = [];
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for (var token in balance.keys) {
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if (token is Erc20Token) {
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erc20TokensTransactions.add(_client.fetchTransactions(
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address,
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contractAddress: token.contractAddress,
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));
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}
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}
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final tokensTransaction = await Future.wait(erc20TokensTransactions);
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transactions.addAll(tokensTransaction.expand((element) => element));
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final Map<String, EthereumTransactionInfo> result = {};
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for (var transactionModel in transactions) {
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if (transactionModel.isError) {
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continue;
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}
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result[transactionModel.hash] = EthereumTransactionInfo(
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id: transactionModel.hash,
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height: transactionModel.blockNumber,
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ethAmount: transactionModel.amount,
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direction: transactionModel.from == address
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? TransactionDirection.outgoing
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: TransactionDirection.incoming,
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isPending: false,
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date: transactionModel.date,
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confirmations: transactionModel.confirmations,
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ethFee: BigInt.from(transactionModel.gasUsed) * transactionModel.gasPrice,
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exponent: transactionModel.tokenDecimal ?? 18,
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tokenSymbol: transactionModel.tokenSymbol ?? "ETH",
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);
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}
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return result;
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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 _encryptionFileUtils.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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@override
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String get privateKey => HEX.encode(_ethPrivateKey.privateKey);
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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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await _updateTransactions();
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_gasPrice = await _client.getGasUnitPrice();
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_estimatedGas = await _client.getEstimatedGas();
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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(seconds: 10),
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(timer) async => _estimatedGas = await _client.getEstimatedGas());
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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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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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'private_key': privateKey,
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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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required EncryptionFileUtils encryptionFileUtils,
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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 encryptionFileUtils.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 privateKey = data['private_key'] 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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privateKey: privateKey,
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initialBalance: balance,
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encryptionFileUtils: encryptionFileUtils,
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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(_ethPrivateKey.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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_ethPrivateKey.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(
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{String? mnemonic, String? privateKey, required String password}) async {
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assert(mnemonic != null || privateKey != null);
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if (privateKey != null) {
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return EthPrivateKey.fromHex(privateKey);
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}
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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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final _token = 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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await erc20TokensBox.put(_token.contractAddress, _token);
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if (_token.enabled) {
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balance[_token] = await _client.fetchERC20Balances(
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_ethPrivateKey.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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}
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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() {
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_updateBalance();
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_updateTransactions();
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}
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void addInitialTokens() {
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final initialErc20Tokens = DefaultErc20Tokens().initialErc20Tokens;
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initialErc20Tokens.forEach((token) => erc20TokensBox.put(token.contractAddress, token));
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}
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@override
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Future<void> renameWalletFiles(String newWalletName) async {
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final currentWalletPath = await pathForWallet(name: walletInfo.name, type: type);
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final currentWalletFile = File(currentWalletPath);
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final currentDirPath = await pathForWalletDir(name: walletInfo.name, type: type);
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final currentTransactionsFile = File('$currentDirPath/$transactionsHistoryFileName');
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// Copies current wallet files into new wallet name's dir and files
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if (currentWalletFile.existsSync()) {
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final newWalletPath = await pathForWallet(name: newWalletName, type: type);
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await currentWalletFile.copy(newWalletPath);
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}
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if (currentTransactionsFile.existsSync()) {
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final newDirPath = await pathForWalletDir(name: newWalletName, type: type);
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await currentTransactionsFile.copy('$newDirPath/$transactionsHistoryFileName');
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}
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// Delete old name's dir and files
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await Directory(currentDirPath).delete(recursive: true);
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}
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void _setTransactionUpdateTimer() {
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if (_transactionsUpdateTimer?.isActive ?? false) {
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_transactionsUpdateTimer!.cancel();
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}
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_transactionsUpdateTimer = Timer.periodic(Duration(seconds: 10), (_) {
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_updateTransactions();
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_updateBalance();
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});
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}
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void updateEtherscanUsageState(bool isEnabled) {
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if (isEnabled) {
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_updateTransactions();
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_setTransactionUpdateTimer();
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} else {
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_transactionsUpdateTimer?.cancel();
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}
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}
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@override
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String get password => _password;
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}
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