cake_wallet/cw_bitcoin/lib/electrum_wallet.dart

1569 lines
54 KiB
Dart

import 'dart:async';
import 'dart:convert';
import 'dart:io';
import 'dart:isolate';
import 'dart:math';
import 'package:bitcoin_base/bitcoin_base.dart';
import 'package:bitcoin_flutter/bitcoin_flutter.dart' as bitcoin;
import 'package:bitcoin_base/bitcoin_base.dart' as bitcoin_base;
import 'package:collection/collection.dart';
import 'package:cw_bitcoin/bitcoin_address_record.dart';
import 'package:cw_bitcoin/bitcoin_transaction_credentials.dart';
import 'package:cw_bitcoin/bitcoin_transaction_no_inputs_exception.dart';
import 'package:cw_bitcoin/bitcoin_transaction_priority.dart';
import 'package:cw_bitcoin/bitcoin_transaction_wrong_balance_exception.dart';
import 'package:cw_bitcoin/bitcoin_unspent.dart';
import 'package:cw_bitcoin/bitcoin_wallet_keys.dart';
import 'package:cw_bitcoin/electrum.dart';
import 'package:cw_bitcoin/electrum_balance.dart';
import 'package:cw_bitcoin/electrum_transaction_history.dart';
import 'package:cw_bitcoin/electrum_transaction_info.dart';
import 'package:cw_bitcoin/electrum_wallet_addresses.dart';
import 'package:cw_bitcoin/litecoin_network.dart';
import 'package:cw_bitcoin/pending_bitcoin_transaction.dart';
import 'package:cw_bitcoin/script_hash.dart';
import 'package:cw_bitcoin/utils.dart';
import 'package:cw_core/crypto_currency.dart';
import 'package:cw_core/node.dart';
import 'package:cw_core/pathForWallet.dart';
import 'package:cw_core/pending_transaction.dart';
import 'package:cw_core/sync_status.dart';
import 'package:cw_core/transaction_direction.dart';
import 'package:cw_core/transaction_priority.dart';
import 'package:cw_core/unspent_coins_info.dart';
import 'package:cw_core/utils/file.dart';
import 'package:cw_core/wallet_base.dart';
import 'package:cw_core/wallet_info.dart';
import 'package:flutter/foundation.dart';
import 'package:hex/hex.dart';
import 'package:hive/hive.dart';
import 'package:mobx/mobx.dart';
import 'package:rxdart/subjects.dart';
import 'package:http/http.dart' as http;
part 'electrum_wallet.g.dart';
class ElectrumWallet = ElectrumWalletBase with _$ElectrumWallet;
abstract class ElectrumWalletBase
extends WalletBase<ElectrumBalance, ElectrumTransactionHistory, ElectrumTransactionInfo>
with Store {
ElectrumWalletBase(
{required String password,
required WalletInfo walletInfo,
required Box<UnspentCoinsInfo> unspentCoinsInfo,
required this.networkType,
required this.mnemonic,
required Uint8List seedBytes,
List<BitcoinAddressRecord>? initialAddresses,
ElectrumClient? electrumClient,
ElectrumBalance? initialBalance,
CryptoCurrency? currency})
: hd = currency == CryptoCurrency.bch
? bitcoinCashHDWallet(seedBytes)
: bitcoin.HDWallet.fromSeed(seedBytes, network: networkType).derivePath("m/0'/0"),
syncStatus = NotConnectedSyncStatus(),
_password = password,
_feeRates = <int>[],
_isTransactionUpdating = false,
isEnabledAutoGenerateSubaddress = true,
unspentCoins = [],
_scripthashesUpdateSubject = {},
balance = ObservableMap<CryptoCurrency, ElectrumBalance>.of(currency != null
? {
currency:
initialBalance ?? const ElectrumBalance(confirmed: 0, unconfirmed: 0, frozen: 0)
}
: {}),
this.unspentCoinsInfo = unspentCoinsInfo,
this.network = networkType == bitcoin.bitcoin
? BitcoinNetwork.mainnet
: networkType == litecoinNetwork
? LitecoinNetwork.mainnet
: BitcoinNetwork.testnet,
this.isTestnet = networkType == bitcoin.testnet,
super(walletInfo) {
this.electrumClient = electrumClient ?? ElectrumClient();
this.walletInfo = walletInfo;
transactionHistory = ElectrumTransactionHistory(walletInfo: walletInfo, password: password);
}
static bitcoin.HDWallet bitcoinCashHDWallet(Uint8List seedBytes) =>
bitcoin.HDWallet.fromSeed(seedBytes).derivePath("m/44'/145'/0'/0");
static int estimatedTransactionSize(int inputsCount, int outputsCounts) =>
inputsCount * 68 + outputsCounts * 34 + 10;
final bitcoin.HDWallet hd;
final String mnemonic;
@override
@observable
bool isEnabledAutoGenerateSubaddress;
late ElectrumClient electrumClient;
Box<UnspentCoinsInfo> unspentCoinsInfo;
@override
late ElectrumWalletAddresses walletAddresses;
@override
@observable
late ObservableMap<CryptoCurrency, ElectrumBalance> balance;
@override
@observable
SyncStatus syncStatus;
List<String> get scriptHashes => walletAddresses.addressesByReceiveType
.map((addr) => scriptHash(addr.address, network: network))
.toList();
List<String> get publicScriptHashes => walletAddresses.allAddresses
.where((addr) => !addr.isHidden)
.map((addr) => scriptHash(addr.address, network: network))
.toList();
String get xpub => hd.base58!;
@override
String get seed => mnemonic;
bitcoin.NetworkType networkType;
BasedUtxoNetwork network;
@override
bool? isTestnet;
@override
BitcoinWalletKeys get keys =>
BitcoinWalletKeys(wif: hd.wif!, privateKey: hd.privKey!, publicKey: hd.pubKey!);
String _password;
List<BitcoinUnspent> unspentCoins;
List<int> _feeRates;
Map<String, BehaviorSubject<Object>?> _scripthashesUpdateSubject;
BehaviorSubject<Object>? _chainTipUpdateSubject;
bool _isTransactionUpdating;
// Future<Isolate>? _isolate;
void Function(FlutterErrorDetails)? _onError;
Timer? _autoSaveTimer;
static const int _autoSaveInterval = 30;
Future<void> init() async {
await walletAddresses.init();
await transactionHistory.init();
_autoSaveTimer =
Timer.periodic(Duration(seconds: _autoSaveInterval), (_) async => await save());
}
// @action
// Future<void> _setListeners(int height, {int? chainTip}) async {
// final currentChainTip = chainTip ?? await electrumClient.getCurrentBlockChainTip() ?? 0;
// syncStatus = AttemptingSyncStatus();
// if (_isolate != null) {
// final runningIsolate = await _isolate!;
// runningIsolate.kill(priority: Isolate.immediate);
// }
// final receivePort = ReceivePort();
// _isolate = Isolate.spawn(
// startRefresh,
// ScanData(
// sendPort: receivePort.sendPort,
// primarySilentAddress: walletAddresses.primarySilentAddress!,
// networkType: networkType,
// height: height,
// chainTip: currentChainTip,
// electrumClient: ElectrumClient(),
// transactionHistoryIds: transactionHistory.transactions.keys.toList(),
// node: electrumClient.uri.toString(),
// labels: walletAddresses.labels,
// ));
// await for (var message in receivePort) {
// if (message is BitcoinUnspent) {
// if (!unspentCoins.any((utx) =>
// utx.hash.contains(message.hash) &&
// utx.vout == message.vout &&
// utx.address.contains(message.address))) {
// unspentCoins.add(message);
// if (unspentCoinsInfo.values.any((element) =>
// element.walletId.contains(id) &&
// element.hash.contains(message.hash) &&
// element.address.contains(message.address))) {
// _addCoinInfo(message);
// await walletInfo.save();
// await save();
// }
// balance[currency] = await _fetchBalances();
// }
// }
// if (message is Map<String, ElectrumTransactionInfo>) {
// transactionHistory.addMany(message);
// await transactionHistory.save();
// }
// // check if is a SyncStatus type since "is SyncStatus" doesn't work here
// if (message is SyncResponse) {
// syncStatus = message.syncStatus;
// walletInfo.restoreHeight = message.height;
// await walletInfo.save();
// }
// }
// }
@action
@override
Future<void> startSync() async {
try {
await _setInitialHeight();
} catch (_) {}
try {
rescan(height: walletInfo.restoreHeight);
await updateTransactions();
_subscribeForUpdates();
await updateUnspent();
await updateBalance();
_feeRates = await electrumClient.feeRates(network: network);
Timer.periodic(
const Duration(minutes: 1), (timer) async => _feeRates = await electrumClient.feeRates());
syncStatus = SyncedSyncStatus();
} catch (e, stacktrace) {
print(stacktrace);
print(e.toString());
syncStatus = FailedSyncStatus();
}
}
@action
@override
Future<void> connectToNode({required Node node}) async {
try {
syncStatus = ConnectingSyncStatus();
await electrumClient.connectToUri(node.uri);
electrumClient.onConnectionStatusChange = (bool isConnected) {
if (!isConnected) {
syncStatus = LostConnectionSyncStatus();
}
};
syncStatus = ConnectedSyncStatus();
// final currentChainTip = await electrumClient.getCurrentBlockChainTip();
// if ((currentChainTip ?? 0) > walletInfo.restoreHeight) {
// _setListeners(walletInfo.restoreHeight, chainTip: currentChainTip);
// }
} catch (e) {
print(e.toString());
syncStatus = FailedSyncStatus();
}
}
Future<EstimatedTxResult> _estimateTxFeeAndInputsToUse(
int credentialsAmount,
bool sendAll,
List<BitcoinBaseAddress> outputAddresses,
List<BitcoinOutput> outputs,
BitcoinTransactionCredentials transactionCredentials,
{int? inputsCount}) async {
final utxos = <UtxoWithAddress>[];
List<ECPrivate> privateKeys = [];
var leftAmount = credentialsAmount;
var allInputsAmount = 0;
for (int i = 0; i < unspentCoins.length; i++) {
final utx = unspentCoins[i];
if (utx.isSending) {
allInputsAmount += utx.value;
leftAmount = leftAmount - utx.value;
if (utx.bitcoinAddressRecord.silentPaymentTweak != null) {
// final d = ECPrivate.fromHex(walletAddresses.primarySilentAddress!.spendPrivkey.toHex())
// .tweakAdd(utx.bitcoinAddressRecord.silentPaymentTweak!)!;
// inputPrivKeys.add(bitcoin.PrivateKeyInfo(d, true));
// address = bitcoin.P2trAddress(address: utx.address, networkType: networkType);
// keyPairs.add(bitcoin.ECPair.fromPrivateKey(d.toCompressedHex().fromHex,
// compressed: true, network: networkType));
// scriptType = bitcoin.AddressType.p2tr;
// script = bitcoin.P2trAddress(pubkey: d.publicKey.toHex(), networkType: networkType)
// .scriptPubkey
// .toBytes();
}
final address = _addressTypeFromStr(utx.address, network);
final privkey = generateECPrivate(
hd: utx.bitcoinAddressRecord.isHidden ? walletAddresses.sideHd : walletAddresses.mainHd,
index: utx.bitcoinAddressRecord.index,
network: network);
privateKeys.add(privkey);
utxos.add(
UtxoWithAddress(
utxo: BitcoinUtxo(
txHash: utx.hash,
value: BigInt.from(utx.value),
vout: utx.vout,
scriptType: _getScriptType(address),
),
ownerDetails:
UtxoAddressDetails(publicKey: privkey.getPublic().toHex(), address: address),
),
);
bool amountIsAcquired = !sendAll && leftAmount <= 0;
if ((inputsCount == null && amountIsAcquired) || inputsCount == i + 1) {
break;
}
}
}
if (inputs.isEmpty) {
throw BitcoinTransactionNoInputsException();
}
final allAmountFee = transactionCredentials.feeRate != null
? feeAmountWithFeeRate(transactionCredentials.feeRate!, inputs.length, outputs.length)
: feeAmountForPriority(transactionCredentials.priority!, inputs.length, outputs.length);
final allAmount = allInputsAmount - allAmountFee;
var credentialsAmount = 0;
var amount = 0;
var fee = 0;
if (hasMultiDestination) {
if (outputs.any((item) => item.sendAll || item.formattedCryptoAmount! <= 0)) {
throw BitcoinTransactionWrongBalanceException(currency);
}
credentialsAmount = outputs.fold(0, (acc, value) => acc + value.formattedCryptoAmount!);
if (allAmount - credentialsAmount < minAmount) {
throw BitcoinTransactionWrongBalanceException(currency);
}
amount = credentialsAmount;
if (transactionCredentials.feeRate != null) {
fee = calculateEstimatedFeeWithFeeRate(transactionCredentials.feeRate!, amount,
outputsCount: outputs.length + 1);
} else {
fee = calculateEstimatedFee(transactionCredentials.priority, amount,
outputsCount: outputs.length + 1);
}
} else {
final output = outputs.first;
credentialsAmount = !output.sendAll ? output.formattedCryptoAmount! : 0;
if (credentialsAmount > allAmount) {
throw BitcoinTransactionWrongBalanceException(currency);
}
amount = output.sendAll || allAmount - credentialsAmount < minAmount
? allAmount
: credentialsAmount;
if (output.sendAll || amount == allAmount) {
fee = allAmountFee;
} else if (transactionCredentials.feeRate != null) {
fee = calculateEstimatedFeeWithFeeRate(transactionCredentials.feeRate!, amount);
} else {
fee = calculateEstimatedFee(transactionCredentials.priority, amount);
}
}
if (fee == 0) {
throw BitcoinTransactionWrongBalanceException(currency);
}
final totalAmount = amount + fee;
if (totalAmount > balance[currency]!.confirmed || totalAmount > allInputsAmount) {
throw BitcoinTransactionWrongBalanceException(currency);
}
final txb = bitcoin.TransactionBuilder(network: networkType);
final changeAddress = await walletAddresses.getChangeAddress();
var leftAmount = totalAmount;
var totalInputAmount = 0;
inputs.clear();
for (final utx in unspentCoins) {
if (utx.isSending) {
leftAmount = leftAmount - utx.value;
final address = _addressTypeFromStr(utx.address, network);
final privkey = generateECPrivate(
hd: utx.bitcoinAddressRecord.isHidden ? walletAddresses.sideHd : walletAddresses.mainHd,
index: utx.bitcoinAddressRecord.index,
network: network);
privateKeys.add(privkey);
utxos.add(
UtxoWithAddress(
utxo: BitcoinUtxo(
txHash: utx.hash,
value: BigInt.from(utx.value),
vout: utx.vout,
scriptType: _getScriptType(address),
),
ownerDetails:
UtxoAddressDetails(publicKey: privkey.getPublic().toHex(), address: address),
),
);
bool amountIsAcquired = !sendAll && leftAmount <= 0;
if ((inputsCount == null && amountIsAcquired) || inputsCount == i + 1) {
break;
}
}
}
if (utxos.isEmpty) {
throw BitcoinTransactionNoInputsException();
}
var changeValue = allInputsAmount - credentialsAmount;
if (!sendAll) {
if (changeValue > 0) {
final changeAddress = await walletAddresses.getChangeAddress();
final address = _addressTypeFromStr(changeAddress, network);
outputAddresses.add(address);
outputs.add(BitcoinOutput(address: address, value: BigInt.from(changeValue)));
}
}
final estimatedSize = BitcoinTransactionBuilder.estimateTransactionSize(
utxos: utxos, outputs: outputs, network: network);
final fee = transactionCredentials.feeRate != null
? feeAmountWithFeeRate(transactionCredentials.feeRate!, 0, 0, size: estimatedSize)
: feeAmountForPriority(transactionCredentials.priority!, 0, 0, size: estimatedSize);
if (fee == 0) {
throw BitcoinTransactionWrongBalanceException(currency);
}
var amount = credentialsAmount;
final lastOutput = outputs.last;
if (!sendAll) {
if (changeValue > fee) {
// Here, lastOutput is change, deduct the fee from it
outputs[outputs.length - 1] =
BitcoinOutput(address: lastOutput.address, value: lastOutput.value - BigInt.from(fee));
}
} else {
// Here, if sendAll, the output amount equals to the input value - fee to fully spend every input on the transaction and have no amount for change
amount = allInputsAmount - fee;
outputs[outputs.length - 1] =
BitcoinOutput(address: lastOutput.address, value: BigInt.from(amount));
}
final totalAmount = amount + fee;
if (totalAmount > balance[currency]!.confirmed) {
throw BitcoinTransactionWrongBalanceException(currency);
}
if (totalAmount > allInputsAmount) {
if (unspentCoins.where((utx) => utx.isSending).length == utxos.length) {
throw BitcoinTransactionWrongBalanceException(currency);
} else {
if (changeValue > fee) {
outputAddresses.removeLast();
outputs.removeLast();
}
return _estimateTxFeeAndInputsToUse(
credentialsAmount, sendAll, outputAddresses, outputs, transactionCredentials,
inputsCount: utxos.length + 1);
}
}
if (SilentPaymentAddress.regex.hasMatch(outputAddress)) {
// final outpointsHash = SilentPayment.hashOutpoints(outpoints);
// final generatedOutputs = SilentPayment.generateMultipleRecipientPubkeys(inputPrivKeys,
// outpointsHash, SilentPaymentDestination.fromAddress(outputAddress, outputAmount!));
// generatedOutputs.forEach((recipientSilentAddress, generatedOutput) {
// generatedOutput.forEach((output) {
// outputs.add(BitcoinOutputDetails(
// address: P2trAddress(
// program: ECPublic.fromHex(output.$1.toHex()).toTapPoint(),
// networkType: networkType),
// value: BigInt.from(output.$2),
// ));
// });
// });
}
outputAddresses.add(address);
if (hasMultiDestination) {
if (out.sendAll || out.formattedCryptoAmount! <= 0) {
throw BitcoinTransactionWrongBalanceException(currency);
}
final outputAmount = out.formattedCryptoAmount!;
credentialsAmount += outputAmount;
outputs.add(BitcoinOutput(address: address, value: BigInt.from(outputAmount)));
} else {
if (!sendAll) {
final outputAmount = out.formattedCryptoAmount!;
credentialsAmount += outputAmount;
outputs.add(BitcoinOutput(address: address, value: BigInt.from(outputAmount)));
} else {
// The value will be changed after estimating the Tx size and deducting the fee from the total
outputs.add(BitcoinOutput(address: address, value: BigInt.from(0)));
}
}
}
final estimatedTx = await _estimateTxFeeAndInputsToUse(
credentialsAmount, sendAll, outputAddresses, outputs, transactionCredentials);
final txb = BitcoinTransactionBuilder(
utxos: estimatedTx.utxos,
outputs: outputs,
fee: BigInt.from(estimatedTx.fee),
network: network);
final transaction = txb.buildTransaction((txDigest, utxo, publicKey, sighash) {
final key = estimatedTx.privateKeys
.firstWhereOrNull((element) => element.getPublic().toHex() == publicKey);
if (key == null) {
throw Exception("Cannot find private key");
}
if (utxo.utxo.isP2tr()) {
return key.signTapRoot(txDigest, sighash: sighash);
} else {
return key.signInput(txDigest, sigHash: sighash);
}
});
return PendingBitcoinTransaction(transaction, type,
electrumClient: electrumClient,
amount: estimatedTx.amount,
fee: estimatedTx.fee,
network: network)
..addListener((transaction) async {
transactionHistory.addOne(transaction);
await updateBalance();
});
} catch (e) {
throw e;
}
}
String toJSON() => json.encode({
'mnemonic': mnemonic,
'account_index': walletAddresses.currentReceiveAddressIndexByType,
'change_address_index': walletAddresses.currentChangeAddressIndexByType,
'addresses': walletAddresses.allAddresses.map((addr) => addr.toJSON()).toList(),
'address_page_type': walletInfo.addressPageType == null
? SegwitAddresType.p2wpkh.toString()
: walletInfo.addressPageType.toString(),
'balance': balance[currency]?.toJSON(),
'silent_addresses': walletAddresses.silentAddresses.map((addr) => addr.toJSON()).toList(),
'silent_address_index': walletAddresses.currentSilentAddressIndex.toString(),
'network_type': network == BitcoinNetwork.testnet ? 'testnet' : 'mainnet',
});
int feeRate(TransactionPriority priority) {
try {
if (priority is BitcoinTransactionPriority) {
return _feeRates[priority.raw];
}
return 0;
} catch (_) {
return 0;
}
}
int feeAmountForPriority(BitcoinTransactionPriority priority, int inputsCount, int outputsCount,
{int? size}) =>
feeRate(priority) * (size ?? estimatedTransactionSize(inputsCount, outputsCount));
int feeAmountWithFeeRate(int feeRate, int inputsCount, int outputsCount, {int? size}) =>
feeRate * (size ?? estimatedTransactionSize(inputsCount, outputsCount));
@override
int calculateEstimatedFee(TransactionPriority? priority, int? amount,
{int? outputsCount, int? size}) {
if (priority is BitcoinTransactionPriority) {
return calculateEstimatedFeeWithFeeRate(feeRate(priority), amount,
outputsCount: outputsCount, size: size);
}
return 0;
}
int calculateEstimatedFeeWithFeeRate(int feeRate, int? amount, {int? outputsCount, int? size}) {
if (size != null) {
return feeAmountWithFeeRate(feeRate, 0, 0, size: size);
}
int inputsCount = 0;
if (amount != null) {
int totalValue = 0;
for (final input in unspentCoins) {
if (totalValue >= amount) {
break;
}
if (input.isSending) {
totalValue += input.value;
inputsCount += 1;
}
}
if (totalValue < amount) return 0;
} else {
for (final input in unspentCoins) {
if (input.isSending) {
inputsCount += 1;
}
}
}
// If send all, then we have no change value
final _outputsCount = outputsCount ?? (amount != null ? 2 : 1);
return feeAmountWithFeeRate(feeRate, inputsCount, _outputsCount);
}
@override
Future<void> save() async {
final path = await makePath();
await write(path: path, password: _password, data: toJSON());
await transactionHistory.save();
}
@override
Future<void> renameWalletFiles(String newWalletName) async {
final currentWalletPath = await pathForWallet(name: walletInfo.name, type: type);
final currentWalletFile = File(currentWalletPath);
final currentDirPath = await pathForWalletDir(name: walletInfo.name, type: type);
final currentTransactionsFile = File('$currentDirPath/$transactionsHistoryFileName');
// Copies current wallet files into new wallet name's dir and files
if (currentWalletFile.existsSync()) {
final newWalletPath = await pathForWallet(name: newWalletName, type: type);
await currentWalletFile.copy(newWalletPath);
}
if (currentTransactionsFile.existsSync()) {
final newDirPath = await pathForWalletDir(name: newWalletName, type: type);
await currentTransactionsFile.copy('$newDirPath/$transactionsHistoryFileName');
}
// Delete old name's dir and files
await Directory(currentDirPath).delete(recursive: true);
}
@override
Future<void> changePassword(String password) async {
_password = password;
await save();
await transactionHistory.changePassword(password);
}
@override
Future<void> rescan({required int height, int? chainTip, ScanData? scanData}) async {
// _setListeners(height);
}
@override
Future<void> close() async {
try {
await electrumClient.close();
} catch (_) {}
_autoSaveTimer?.cancel();
}
Future<String> makePath() async => pathForWallet(name: walletInfo.name, type: walletInfo.type);
Future<void> updateUnspent() async {
// Update unspents stored from scanned silent payment transactions
transactionHistory.transactions.values.forEach((tx) {
if (tx.unspent != null) {
if (!unspentCoins
.any((utx) => utx.hash.contains(tx.unspent!.hash) && utx.vout == tx.unspent!.vout)) {
unspentCoins.add(tx.unspent!);
}
}
});
List<BitcoinUnspent> updatedUnspentCoins = [];
final addressesSet = walletAddresses.allAddresses.map((addr) => addr.address).toSet();
await Future.wait(walletAddresses.allAddresses.map((address) => electrumClient
.getListUnspentWithAddress(address.address, network)
.then((unspent) => Future.forEach<Map<String, dynamic>>(unspent, (unspent) async {
try {
final coin = BitcoinUnspent.fromJSON(address, unspent);
final tx = await fetchTransactionInfo(
hash: coin.hash, height: 0, myAddresses: addressesSet);
coin.isChange = tx?.direction == TransactionDirection.outgoing;
updatedUnspentCoins.add(coin);
} catch (_) {}
}))));
unspentCoins = updatedUnspentCoins;
if (unspentCoinsInfo.isEmpty) {
unspentCoins.forEach((coin) => _addCoinInfo(coin));
return;
}
if (unspentCoins.isNotEmpty) {
unspentCoins.forEach((coin) {
final coinInfoList = unspentCoinsInfo.values.where((element) =>
element.walletId.contains(id) &&
element.hash.contains(coin.hash) &&
element.address.contains(coin.address));
if (coinInfoList.isNotEmpty) {
final coinInfo = coinInfoList.first;
coin.isFrozen = coinInfo.isFrozen;
coin.isSending = coinInfo.isSending;
coin.note = coinInfo.note;
} else {
_addCoinInfo(coin);
}
});
}
await _refreshUnspentCoinsInfo();
}
@action
Future<void> _addCoinInfo(BitcoinUnspent coin) async {
final newInfo = UnspentCoinsInfo(
walletId: id,
hash: coin.hash,
isFrozen: coin.isFrozen,
isSending: coin.isSending,
noteRaw: coin.note,
address: coin.bitcoinAddressRecord.address,
value: coin.value,
vout: coin.vout,
isChange: coin.isChange,
);
await unspentCoinsInfo.add(newInfo);
}
Future<void> _refreshUnspentCoinsInfo() async {
try {
final List<dynamic> keys = <dynamic>[];
final currentWalletUnspentCoins =
unspentCoinsInfo.values.where((element) => element.walletId.contains(id));
if (currentWalletUnspentCoins.isNotEmpty) {
currentWalletUnspentCoins.forEach((element) {
final existUnspentCoins = unspentCoins
.where((coin) => element.hash.contains(coin.hash) && element.vout == coin.vout);
if (existUnspentCoins.isEmpty) {
keys.add(element.key);
}
});
}
if (keys.isNotEmpty) {
await unspentCoinsInfo.deleteAll(keys);
}
} catch (e) {
print(e.toString());
}
}
Future<ElectrumTransactionBundle> getTransactionExpanded(
{required String hash, required int height}) async {
String transactionHex;
int? time;
int confirmations = 0;
if (network == BitcoinNetwork.testnet) {
// Testnet public electrum server does not support verbose transaction fetching
transactionHex = await electrumClient.getTransactionHex(hash: hash);
final status = json.decode(
(await http.get(Uri.parse("https://blockstream.info/testnet/api/tx/$hash/status"))).body);
time = status["block_time"] as int?;
final tip = await electrumClient.getCurrentBlockChainTip() ?? 0;
confirmations = tip - (status["block_height"] as int? ?? 0);
} else {
final verboseTransaction = await electrumClient.getTransactionRaw(hash: hash);
transactionHex = verboseTransaction['hex'] as String;
time = verboseTransaction['time'] as int?;
confirmations = verboseTransaction['confirmations'] as int? ?? 0;
}
final original = BtcTransaction.fromRaw(transactionHex);
final ins = <BtcTransaction>[];
for (final vin in original.inputs) {
try {
final id = HEX.encode(HEX.decode(vin.txId).reversed.toList());
final txHex = await electrumClient.getTransactionHex(hash: id);
final tx = BtcTransaction.fromRaw(txHex);
ins.add(tx);
} catch (_) {
ins.add(BtcTransaction.fromRaw(await electrumClient.getTransactionHex(hash: vin.txId)));
}
}
return ElectrumTransactionBundle(original,
ins: ins, time: time, confirmations: confirmations, height: height);
}
Future<ElectrumTransactionInfo?> fetchTransactionInfo(
{required String hash,
required int height,
required Set<String> myAddresses,
bool? retryOnFailure}) async {
try {
return ElectrumTransactionInfo.fromElectrumBundle(
await getTransactionExpanded(hash: hash, height: height), walletInfo.type, network,
addresses: myAddresses, height: height);
} catch (e) {
if (e is FormatException && retryOnFailure == true) {
await Future.delayed(const Duration(seconds: 2));
return fetchTransactionInfo(hash: hash, height: height, myAddresses: myAddresses);
}
return null;
}
}
@override
Future<Map<String, ElectrumTransactionInfo>> fetchTransactions() async {
try {
final Map<String, ElectrumTransactionInfo> historiesWithDetails = {};
final addressesSet = walletAddresses.allAddresses.map((addr) => addr.address).toSet();
final currentHeight = await electrumClient.getCurrentBlockChainTip() ?? 0;
await Future.wait(ADDRESS_TYPES.map((type) {
final addressesByType = walletAddresses.allAddresses.where((addr) => addr.type == type);
return Future.wait(addressesByType.map((addressRecord) async {
final history = await _fetchAddressHistory(addressRecord, addressesSet, currentHeight);
if (history.isNotEmpty) {
addressRecord.txCount = history.length;
historiesWithDetails.addAll(history);
final matchedAddresses =
addressesByType.where((addr) => addr.isHidden == addressRecord.isHidden);
final isLastUsedAddress =
history.isNotEmpty && addressRecord.address == matchedAddresses.last.address;
if (isLastUsedAddress) {
await walletAddresses.discoverAddresses(
matchedAddresses.toList(),
addressRecord.isHidden,
(address, addressesSet) =>
_fetchAddressHistory(address, addressesSet, currentHeight)
.then((history) => history.isNotEmpty ? address.address : null),
type: type);
}
}
}));
}));
return historiesWithDetails;
} catch (e) {
print(e.toString());
return {};
}
}
Future<Map<String, ElectrumTransactionInfo>> _fetchAddressHistory(
BitcoinAddressRecord addressRecord, Set<String> addressesSet, int currentHeight) async {
try {
final Map<String, ElectrumTransactionInfo> historiesWithDetails = {};
final history = await electrumClient
.getHistory(addressRecord.scriptHash ?? addressRecord.updateScriptHash(network));
if (history.isNotEmpty) {
addressRecord.setAsUsed();
await Future.wait(history.map((transaction) async {
final txid = transaction['tx_hash'] as String;
final height = transaction['height'] as int;
final storedTx = transactionHistory.transactions[txid];
if (storedTx != null) {
if (height > 0) {
storedTx.height = height;
// the tx's block itself is the first confirmation so add 1
storedTx.confirmations = currentHeight - height + 1;
storedTx.isPending = storedTx.confirmations == 0;
}
historiesWithDetails[txid] = storedTx;
} else {
final tx = await fetchTransactionInfo(
hash: txid, height: height, myAddresses: addressesSet, retryOnFailure: true);
if (tx != null) {
historiesWithDetails[txid] = tx;
// Got a new transaction fetched, add it to the transaction history
// instead of waiting all to finish, and next time it will be faster
transactionHistory.addOne(tx);
await transactionHistory.save();
}
}
return Future.value(null);
}));
}
return historiesWithDetails;
} catch (e) {
print(e.toString());
return {};
}
}
Future<void> updateTransactions() async {
try {
if (_isTransactionUpdating) {
return;
}
_isTransactionUpdating = true;
await fetchTransactions();
walletAddresses.updateReceiveAddresses();
_isTransactionUpdating = false;
} catch (e, stacktrace) {
print(stacktrace);
print(e);
_isTransactionUpdating = false;
}
}
void _subscribeForUpdates() async {
scriptHashes.forEach((sh) async {
await _scripthashesUpdateSubject[sh]?.close();
_scripthashesUpdateSubject[sh] = electrumClient.scripthashUpdate(sh);
_scripthashesUpdateSubject[sh]?.listen((event) async {
try {
await updateUnspent();
await updateBalance();
await updateTransactions();
} catch (e, s) {
print(e.toString());
_onError?.call(FlutterErrorDetails(
exception: e,
stack: s,
library: this.runtimeType.toString(),
));
}
});
});
await _chainTipUpdateSubject?.close();
_chainTipUpdateSubject = electrumClient.chainTipUpdate();
_chainTipUpdateSubject?.listen((_) async {
try {
final currentHeight = await electrumClient.getCurrentBlockChainTip();
if (currentHeight != null) walletInfo.restoreHeight = currentHeight;
// _setListeners(walletInfo.restoreHeight, chainTip: currentHeight);
} catch (e, s) {
print(e.toString());
_onError?.call(FlutterErrorDetails(
exception: e,
stack: s,
library: this.runtimeType.toString(),
));
}
});
}
Future<ElectrumBalance> _fetchBalances() async {
final addresses = walletAddresses.allAddresses.toList();
final balanceFutures = <Future<Map<String, dynamic>>>[];
for (var i = 0; i < addresses.length; i++) {
final addressRecord = addresses[i];
final sh = scriptHash(addressRecord.address, network: network);
final balanceFuture = electrumClient.getBalance(sh);
balanceFutures.add(balanceFuture);
}
var totalFrozen = 0;
var totalConfirmed = 0;
var totalUnconfirmed = 0;
// Add values from unspent coins that are not fetched by the address list
// i.e. scanned silent payments
unspentCoinsInfo.values.forEach((info) {
unspentCoins.forEach((element) {
if (element.hash == info.hash &&
element.bitcoinAddressRecord.address == info.address &&
element.value == info.value) {
if (info.isFrozen) totalFrozen += element.value;
if (element.bitcoinAddressRecord.silentPaymentTweak != null) {
totalConfirmed += element.value;
}
}
});
});
final balances = await Future.wait(balanceFutures);
for (var i = 0; i < balances.length; i++) {
final addressRecord = addresses[i];
final balance = balances[i];
final confirmed = balance['confirmed'] as int? ?? 0;
final unconfirmed = balance['unconfirmed'] as int? ?? 0;
totalConfirmed += confirmed;
totalUnconfirmed += unconfirmed;
if (confirmed > 0 || unconfirmed > 0) {
addressRecord.setAsUsed();
}
}
return ElectrumBalance(
confirmed: totalConfirmed, unconfirmed: totalUnconfirmed, frozen: totalFrozen);
}
Future<void> updateBalance() async {
balance[currency] = await _fetchBalances();
await save();
}
String getChangeAddress() {
const minCountOfHiddenAddresses = 5;
final random = Random();
var addresses = walletAddresses.allAddresses.where((addr) => addr.isHidden).toList();
if (addresses.length < minCountOfHiddenAddresses) {
addresses = walletAddresses.allAddresses.toList();
}
return addresses[random.nextInt(addresses.length)].address;
}
@override
void setExceptionHandler(void Function(FlutterErrorDetails) onError) => _onError = onError;
@override
String signMessage(String message, {String? address = null}) {
final index = address != null
? walletAddresses.allAddresses.firstWhere((element) => element.address == address).index
: null;
final HD = index == null ? hd : hd.derive(index);
return base64Encode(HD.signMessage(message));
}
Future<void> _setInitialHeight() async {
if (walletInfo.isRecovery) {
return;
}
if (walletInfo.restoreHeight == 0) {
final currentHeight = await electrumClient.getCurrentBlockChainTip();
if (currentHeight != null) walletInfo.restoreHeight = currentHeight;
}
}
}
class ScanData {
final SendPort sendPort;
final SilentPaymentReceiver primarySilentAddress;
final int height;
final String node;
final bitcoin.NetworkType networkType;
final int chainTip;
final ElectrumClient electrumClient;
final List<String> transactionHistoryIds;
final Map<String, String> labels;
ScanData({
required this.sendPort,
required this.primarySilentAddress,
required this.height,
required this.node,
required this.networkType,
required this.chainTip,
required this.electrumClient,
required this.transactionHistoryIds,
required this.labels,
});
factory ScanData.fromHeight(ScanData scanData, int newHeight) {
return ScanData(
sendPort: scanData.sendPort,
primarySilentAddress: scanData.primarySilentAddress,
height: newHeight,
node: scanData.node,
networkType: scanData.networkType,
chainTip: scanData.chainTip,
transactionHistoryIds: scanData.transactionHistoryIds,
electrumClient: scanData.electrumClient,
labels: scanData.labels,
);
}
}
class SyncResponse {
final int height;
final SyncStatus syncStatus;
SyncResponse(this.height, this.syncStatus);
}
// Future<void> startRefresh(ScanData scanData) async {
// var cachedBlockchainHeight = scanData.chainTip;
// Future<int> getNodeHeightOrUpdate(int baseHeight) async {
// if (cachedBlockchainHeight < baseHeight || cachedBlockchainHeight == 0) {
// final electrumClient = scanData.electrumClient;
// if (!electrumClient.isConnected) {
// final node = scanData.node;
// await electrumClient.connectToUri(Uri.parse(node));
// }
// cachedBlockchainHeight =
// await electrumClient.getCurrentBlockChainTip() ?? cachedBlockchainHeight;
// }
// return cachedBlockchainHeight;
// }
// var lastKnownBlockHeight = 0;
// var initialSyncHeight = 0;
// var syncHeight = scanData.height;
// var currentChainTip = scanData.chainTip;
// if (syncHeight <= 0) {
// syncHeight = currentChainTip;
// }
// if (initialSyncHeight <= 0) {
// initialSyncHeight = syncHeight;
// }
// if (lastKnownBlockHeight == syncHeight) {
// scanData.sendPort.send(SyncResponse(currentChainTip, SyncedSyncStatus()));
// return;
// }
// // Run this until no more blocks left to scan txs. At first this was recursive
// // i.e. re-calling the startRefresh function but this was easier for the above values to retain
// // their initial values
// while (true) {
// lastKnownBlockHeight = syncHeight;
// final syncingStatus =
// SyncingSyncStatus.fromHeightValues(currentChainTip, initialSyncHeight, syncHeight);
// scanData.sendPort.send(SyncResponse(syncHeight, syncingStatus));
// if (syncingStatus.blocksLeft <= 0) {
// scanData.sendPort.send(SyncResponse(currentChainTip, SyncedSyncStatus()));
// return;
// }
// // print(["Scanning from height:", syncHeight]);
// try {
// final networkPath =
// scanData.networkType.network == bitcoin.BtcNetwork.mainnet ? "" : "/testnet";
// // This endpoint gets up to 10 latest blocks from the given height
// final tenNewestBlocks =
// (await http.get(Uri.parse("https://blockstream.info$networkPath/api/blocks/$syncHeight")))
// .body;
// var decodedBlocks = json.decode(tenNewestBlocks) as List<dynamic>;
// decodedBlocks.sort((a, b) => (a["height"] as int).compareTo(b["height"] as int));
// decodedBlocks =
// decodedBlocks.where((element) => (element["height"] as int) >= syncHeight).toList();
// // for each block, get up to 25 txs
// for (var i = 0; i < decodedBlocks.length; i++) {
// final blockJson = decodedBlocks[i];
// final blockHash = blockJson["id"];
// final txCount = blockJson["tx_count"] as int;
// // print(["Scanning block index:", i, "with tx count:", txCount]);
// int startIndex = 0;
// // go through each tx in block until no more txs are left
// while (startIndex < txCount) {
// // This endpoint gets up to 25 txs from the given block hash and start index
// final twentyFiveTxs = json.decode((await http.get(Uri.parse(
// "https://blockstream.info$networkPath/api/block/$blockHash/txs/$startIndex")))
// .body) as List<dynamic>;
// // print(["Scanning txs index:", startIndex]);
// // For each tx, apply silent payment filtering and do shared secret calculation when applied
// for (var i = 0; i < twentyFiveTxs.length; i++) {
// try {
// final tx = twentyFiveTxs[i];
// final txid = tx["txid"] as String;
// // print(["Scanning tx:", txid]);
// // TODO: if tx already scanned & stored skip
// // if (scanData.transactionHistoryIds.contains(txid)) {
// // // already scanned tx, continue to next tx
// // pos++;
// // continue;
// // }
// List<String> pubkeys = [];
// List<bitcoin.Outpoint> outpoints = [];
// bool skip = false;
// for (var i = 0; i < (tx["vin"] as List<dynamic>).length; i++) {
// final input = tx["vin"][i];
// final prevout = input["prevout"];
// final scriptPubkeyType = prevout["scriptpubkey_type"];
// String? pubkey;
// if (scriptPubkeyType == "v0_p2wpkh" || scriptPubkeyType == "v1_p2tr") {
// final witness = input["witness"];
// if (witness == null) {
// skip = true;
// // print("Skipping, no witness");
// break;
// }
// if (witness.length == 2) {
// pubkey = witness[1] as String;
// } else if (witness.length == 1) {
// pubkey = "02" + (prevout["scriptpubkey"] as String).fromHex.sublist(2).hex;
// }
// }
// if (scriptPubkeyType == "p2pkh") {
// pubkey = bitcoin.P2pkhAddress(
// scriptSig: bitcoin.Script.fromRaw(hexData: input["scriptsig"] as String))
// .pubkey;
// }
// if (pubkey == null) {
// skip = true;
// // print("Skipping, invalid witness");
// break;
// }
// pubkeys.add(pubkey);
// outpoints.add(
// bitcoin.Outpoint(txid: input["txid"] as String, index: input["vout"] as int));
// }
// if (skip) {
// // skipped tx, continue to next tx
// continue;
// }
// Map<String, bitcoin.Outpoint> outpointsByP2TRpubkey = {};
// for (var i = 0; i < (tx["vout"] as List<dynamic>).length; i++) {
// final output = tx["vout"][i];
// if (output["scriptpubkey_type"] != "v1_p2tr") {
// // print("Skipping, not a v1_p2tr output");
// continue;
// }
// final script = (output["scriptpubkey"] as String).fromHex;
// // final alreadySpentOutput = (await electrumClient.getHistory(
// // scriptHashFromScript(script, networkType: scanData.networkType)))
// // .length >
// // 1;
// // if (alreadySpentOutput) {
// // print("Skipping, invalid witness");
// // break;
// // }
// final p2tr = bitcoin.P2trAddress(
// program: script.sublist(2).hex, networkType: scanData.networkType);
// final address = p2tr.address;
// print(["Verifying taproot address:", address]);
// outpointsByP2TRpubkey[script.sublist(2).hex] =
// bitcoin.Outpoint(txid: txid, index: i, value: output["value"] as int);
// }
// if (pubkeys.isEmpty || outpoints.isEmpty || outpointsByP2TRpubkey.isEmpty) {
// // skipped tx, continue to next tx
// continue;
// }
// final outpointHash = bitcoin.SilentPayment.hashOutpoints(outpoints);
// final result = bitcoin.scanOutputs(
// scanData.primarySilentAddress.scanPrivkey,
// scanData.primarySilentAddress.spendPubkey,
// bitcoin.getSumInputPubKeys(pubkeys),
// outpointHash,
// outpointsByP2TRpubkey.keys.map((e) => e.fromHex).toList(),
// labels: scanData.labels,
// );
// if (result.isEmpty) {
// // no results tx, continue to next tx
// continue;
// }
// if (result.length > 1) {
// print("MULTIPLE UNSPENT COINS FOUND!");
// } else {
// print("UNSPENT COIN FOUND!");
// }
// result.forEach((key, value) async {
// final outpoint = outpointsByP2TRpubkey[key];
// if (outpoint == null) {
// return;
// }
// final tweak = value[0];
// String? label;
// if (value.length > 1) label = value[1];
// final txInfo = ElectrumTransactionInfo(
// WalletType.bitcoin,
// id: txid,
// height: syncHeight,
// amount: outpoint.value!,
// fee: 0,
// direction: TransactionDirection.incoming,
// isPending: false,
// date: DateTime.fromMillisecondsSinceEpoch((blockJson["timestamp"] as int) * 1000),
// confirmations: currentChainTip - syncHeight,
// to: bitcoin.SilentPaymentAddress.createLabeledSilentPaymentAddress(
// scanData.primarySilentAddress.scanPubkey,
// scanData.primarySilentAddress.spendPubkey,
// label != null ? label.fromHex : "0".fromHex,
// hrp: scanData.primarySilentAddress.hrp,
// version: scanData.primarySilentAddress.version)
// .toString(),
// unspent: null,
// );
// final status = json.decode((await http
// .get(Uri.parse("https://blockstream.info/testnet/api/tx/$txid/outspends")))
// .body) as List<dynamic>;
// bool spent = false;
// for (final s in status) {
// if ((s["spent"] as bool) == true) {
// spent = true;
// scanData.sendPort.send({txid: txInfo});
// final sentTxId = s["txid"] as String;
// final sentTx = json.decode((await http
// .get(Uri.parse("https://blockstream.info/testnet/api/tx/$sentTxId")))
// .body);
// int amount = 0;
// for (final out in (sentTx["vout"] as List<dynamic>)) {
// amount += out["value"] as int;
// }
// final height = s["status"]["block_height"] as int;
// scanData.sendPort.send({
// sentTxId: ElectrumTransactionInfo(
// WalletType.bitcoin,
// id: sentTxId,
// height: height,
// amount: amount,
// fee: 0,
// direction: TransactionDirection.outgoing,
// isPending: false,
// date: DateTime.fromMillisecondsSinceEpoch(
// (s["status"]["block_time"] as int) * 1000),
// confirmations: currentChainTip - height,
// )
// });
// }
// }
// if (spent) {
// return;
// }
// final unspent = BitcoinUnspent(
// BitcoinAddressRecord(
// bitcoin.P2trAddress(program: key, networkType: scanData.networkType).address,
// index: 0,
// isHidden: true,
// isUsed: true,
// silentAddressLabel: null,
// silentPaymentTweak: tweak,
// type: bitcoin.AddressType.p2tr,
// ),
// txid,
// outpoint.value!,
// outpoint.index,
// silentPaymentTweak: tweak,
// type: bitcoin.AddressType.p2tr,
// );
// // found utxo for tx, send unspent coin to main isolate
// scanData.sendPort.send(unspent);
// // also send tx data for tx history
// txInfo.unspent = unspent;
// scanData.sendPort.send({txid: txInfo});
// });
// } catch (_) {}
// }
// // Finished scanning batch of txs in block, add 25 to start index and continue to next block in loop
// startIndex += 25;
// }
// // Finished scanning block, add 1 to height and continue to next block in loop
// syncHeight += 1;
// currentChainTip = await getNodeHeightOrUpdate(syncHeight);
// scanData.sendPort.send(SyncResponse(syncHeight,
// SyncingSyncStatus.fromHeightValues(currentChainTip, initialSyncHeight, syncHeight)));
// }
// } catch (e, stacktrace) {
// print(stacktrace);
// print(e.toString());
// scanData.sendPort.send(SyncResponse(syncHeight, NotConnectedSyncStatus()));
// break;
// }
// }
// }
class EstimatedTxResult {
EstimatedTxResult(
{required this.utxos, required this.privateKeys, required this.fee, required this.amount});
final List<UtxoWithAddress> utxos;
final List<ECPrivate> privateKeys;
final int fee;
final int amount;
}
BitcoinBaseAddress _addressTypeFromStr(String address, BasedUtxoNetwork network) {
if (P2pkhAddress.regex.hasMatch(address)) {
return P2pkhAddress.fromAddress(address: address, network: network);
} else if (P2shAddress.regex.hasMatch(address)) {
return P2shAddress.fromAddress(address: address, network: network);
} else if (P2wshAddress.regex.hasMatch(address)) {
return P2wshAddress.fromAddress(address: address, network: network);
} else if (P2trAddress.regex.hasMatch(address)) {
return P2trAddress.fromAddress(address: address, network: network);
} else {
return P2wpkhAddress.fromAddress(address: address, network: network);
}
}
BitcoinAddressType _getScriptType(BitcoinBaseAddress type) {
if (type is P2pkhAddress) {
return P2pkhAddressType.p2pkh;
} else if (type is P2shAddress) {
return P2shAddressType.p2wpkhInP2sh;
} else if (type is P2wshAddress) {
return SegwitAddresType.p2wsh;
} else if (type is P2trAddress) {
return SegwitAddresType.p2tr;
} else {
return SegwitAddresType.p2wpkh;
}
}
class EstimateTxParams {
EstimateTxParams(
{required this.amount,
required this.feeRate,
required this.priority,
required this.outputsCount,
required this.size});
final int amount;
final int feeRate;
final TransactionPriority priority;
final int outputsCount;
final int size;
}
class EstimatedTxResult {
EstimatedTxResult(
{required this.utxos, required this.privateKeys, required this.fee, required this.amount});
final List<UtxoWithAddress> utxos;
final List<ECPrivate> privateKeys;
final int fee;
final int amount;
}
BitcoinBaseAddress _addressTypeFromStr(String address, BasedUtxoNetwork network) {
if (P2pkhAddress.regex.hasMatch(address)) {
return P2pkhAddress.fromAddress(address: address, network: network);
} else if (P2shAddress.regex.hasMatch(address)) {
return P2shAddress.fromAddress(address: address, network: network);
} else if (P2wshAddress.regex.hasMatch(address)) {
return P2wshAddress.fromAddress(address: address, network: network);
} else if (P2trAddress.regex.hasMatch(address)) {
return P2trAddress.fromAddress(address: address, network: network);
} else {
return P2wpkhAddress.fromAddress(address: address, network: network);
}
}
BitcoinAddressType _getScriptType(BitcoinBaseAddress type) {
if (type is P2pkhAddress) {
return P2pkhAddressType.p2pkh;
} else if (type is P2shAddress) {
return P2shAddressType.p2wpkhInP2sh;
} else if (type is P2wshAddress) {
return SegwitAddresType.p2wsh;
} else if (type is P2trAddress) {
return SegwitAddresType.p2tr;
} else {
return SegwitAddresType.p2wpkh;
}
}