cake_wallet/cw_bitcoin/lib/litecoin_wallet.dart
2024-09-24 12:57:12 -07:00

1081 lines
36 KiB
Dart

import 'dart:async';
import 'dart:convert';
import 'package:convert/convert.dart' as convert;
import 'dart:math';
import 'package:collection/collection.dart';
import 'package:crypto/crypto.dart';
import 'package:cw_core/cake_hive.dart';
import 'package:cw_core/mweb_utxo.dart';
import 'package:cw_mweb/mwebd.pbgrpc.dart';
import 'package:fixnum/fixnum.dart';
import 'package:bip39/bip39.dart' as bip39;
import 'package:bitcoin_base/bitcoin_base.dart';
import 'package:blockchain_utils/blockchain_utils.dart';
import 'package:blockchain_utils/signer/ecdsa_signing_key.dart';
import 'package:cw_bitcoin/bitcoin_address_record.dart';
import 'package:cw_bitcoin/bitcoin_mnemonic.dart';
import 'package:cw_bitcoin/bitcoin_transaction_priority.dart';
import 'package:cw_bitcoin/bitcoin_unspent.dart';
import 'package:cw_bitcoin/electrum_transaction_info.dart';
import 'package:cw_bitcoin/pending_bitcoin_transaction.dart';
import 'package:cw_bitcoin/utils.dart';
import 'package:cw_bitcoin/electrum_derivations.dart';
import 'package:cw_core/encryption_file_utils.dart';
import 'package:cw_core/crypto_currency.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/unspent_coins_info.dart';
import 'package:cw_bitcoin/electrum_balance.dart';
import 'package:cw_bitcoin/electrum_wallet.dart';
import 'package:cw_bitcoin/electrum_wallet_snapshot.dart';
import 'package:cw_bitcoin/litecoin_wallet_addresses.dart';
import 'package:cw_core/transaction_priority.dart';
import 'package:cw_core/wallet_info.dart';
import 'package:cw_core/wallet_keys_file.dart';
import 'package:flutter/foundation.dart';
import 'package:grpc/grpc.dart';
import 'package:hive/hive.dart';
import 'package:mobx/mobx.dart';
import 'package:cw_core/wallet_type.dart';
import 'package:cw_mweb/cw_mweb.dart';
import 'package:bitcoin_base/src/crypto/keypair/sign_utils.dart';
import 'package:pointycastle/ecc/api.dart';
import 'package:pointycastle/ecc/curves/secp256k1.dart';
part 'litecoin_wallet.g.dart';
class LitecoinWallet = LitecoinWalletBase with _$LitecoinWallet;
abstract class LitecoinWalletBase extends ElectrumWallet with Store {
LitecoinWalletBase({
required String mnemonic,
required String password,
required WalletInfo walletInfo,
required Box<UnspentCoinsInfo> unspentCoinsInfo,
required Uint8List seedBytes,
required EncryptionFileUtils encryptionFileUtils,
String? passphrase,
String? addressPageType,
List<BitcoinAddressRecord>? initialAddresses,
List<BitcoinAddressRecord>? initialMwebAddresses,
ElectrumBalance? initialBalance,
Map<String, int>? initialRegularAddressIndex,
Map<String, int>? initialChangeAddressIndex,
int? initialMwebHeight,
bool? alwaysScan,
}) : super(
mnemonic: mnemonic,
password: password,
walletInfo: walletInfo,
unspentCoinsInfo: unspentCoinsInfo,
network: LitecoinNetwork.mainnet,
initialAddresses: initialAddresses,
initialBalance: initialBalance,
seedBytes: seedBytes,
encryptionFileUtils: encryptionFileUtils,
currency: CryptoCurrency.ltc,
) {
mwebHd = Bip32Slip10Secp256k1.fromSeed(seedBytes).derivePath("m/1000'") as Bip32Slip10Secp256k1;
mwebEnabled = alwaysScan ?? false;
walletAddresses = LitecoinWalletAddresses(
walletInfo,
initialAddresses: initialAddresses,
initialRegularAddressIndex: initialRegularAddressIndex,
initialChangeAddressIndex: initialChangeAddressIndex,
initialMwebAddresses: initialMwebAddresses,
mainHd: hd,
sideHd: accountHD.childKey(Bip32KeyIndex(1)),
network: network,
mwebHd: mwebHd,
mwebEnabled: mwebEnabled,
);
autorun((_) {
this.walletAddresses.isEnabledAutoGenerateSubaddress = this.isEnabledAutoGenerateSubaddress;
});
}
late final Bip32Slip10Secp256k1 mwebHd;
late final Box<MwebUtxo> mwebUtxosBox;
Timer? _syncTimer;
Timer? _feeRatesTimer;
StreamSubscription<Utxo>? _utxoStream;
late RpcClient _stub;
late bool mwebEnabled;
List<int> get scanSecret => mwebHd.childKey(Bip32KeyIndex(0x80000000)).privateKey.privKey.raw;
List<int> get spendSecret => mwebHd.childKey(Bip32KeyIndex(0x80000001)).privateKey.privKey.raw;
static Future<LitecoinWallet> create(
{required String mnemonic,
required String password,
required WalletInfo walletInfo,
required Box<UnspentCoinsInfo> unspentCoinsInfo,
required EncryptionFileUtils encryptionFileUtils,
String? passphrase,
String? addressPageType,
List<BitcoinAddressRecord>? initialAddresses,
List<BitcoinAddressRecord>? initialMwebAddresses,
ElectrumBalance? initialBalance,
Map<String, int>? initialRegularAddressIndex,
Map<String, int>? initialChangeAddressIndex}) async {
late Uint8List seedBytes;
switch (walletInfo.derivationInfo?.derivationType) {
case DerivationType.bip39:
seedBytes = await bip39.mnemonicToSeed(
mnemonic,
passphrase: passphrase ?? "",
);
break;
case DerivationType.electrum:
default:
seedBytes = await mnemonicToSeedBytes(mnemonic, passphrase: passphrase ?? "");
break;
}
return LitecoinWallet(
mnemonic: mnemonic,
password: password,
walletInfo: walletInfo,
unspentCoinsInfo: unspentCoinsInfo,
initialAddresses: initialAddresses,
initialMwebAddresses: initialMwebAddresses,
initialBalance: initialBalance,
encryptionFileUtils: encryptionFileUtils,
passphrase: passphrase,
seedBytes: seedBytes,
initialRegularAddressIndex: initialRegularAddressIndex,
initialChangeAddressIndex: initialChangeAddressIndex,
addressPageType: addressPageType,
);
}
static Future<LitecoinWallet> open({
required String name,
required WalletInfo walletInfo,
required Box<UnspentCoinsInfo> unspentCoinsInfo,
required String password,
required bool alwaysScan,
required EncryptionFileUtils encryptionFileUtils,
}) async {
final hasKeysFile = await WalletKeysFile.hasKeysFile(name, walletInfo.type);
ElectrumWalletSnapshot? snp = null;
try {
snp = await ElectrumWalletSnapshot.load(
encryptionFileUtils,
name,
walletInfo.type,
password,
LitecoinNetwork.mainnet,
);
} catch (e) {
if (!hasKeysFile) rethrow;
}
final WalletKeysData keysData;
// Migrate wallet from the old scheme to then new .keys file scheme
if (!hasKeysFile) {
keysData =
WalletKeysData(mnemonic: snp!.mnemonic, xPub: snp.xpub, passphrase: snp.passphrase);
} else {
keysData = await WalletKeysFile.readKeysFile(
name,
walletInfo.type,
password,
encryptionFileUtils,
);
}
walletInfo.derivationInfo ??= DerivationInfo();
// set the default if not present:
walletInfo.derivationInfo!.derivationPath ??= snp?.derivationPath ?? electrum_path;
walletInfo.derivationInfo!.derivationType ??= snp?.derivationType ?? DerivationType.electrum;
Uint8List? seedBytes = null;
final mnemonic = keysData.mnemonic;
final passphrase = keysData.passphrase;
if (mnemonic != null) {
switch (walletInfo.derivationInfo?.derivationType) {
case DerivationType.bip39:
seedBytes = await bip39.mnemonicToSeed(
mnemonic,
passphrase: passphrase ?? "",
);
break;
case DerivationType.electrum:
default:
seedBytes = await mnemonicToSeedBytes(mnemonic, passphrase: passphrase ?? "");
break;
}
}
return LitecoinWallet(
mnemonic: keysData.mnemonic!,
password: password,
walletInfo: walletInfo,
unspentCoinsInfo: unspentCoinsInfo,
initialAddresses: snp?.addresses,
initialMwebAddresses: snp?.mwebAddresses,
initialBalance: snp?.balance,
seedBytes: seedBytes!,
passphrase: passphrase,
encryptionFileUtils: encryptionFileUtils,
initialRegularAddressIndex: snp?.regularAddressIndex,
initialChangeAddressIndex: snp?.changeAddressIndex,
addressPageType: snp?.addressPageType,
alwaysScan: alwaysScan,
);
}
Future<void> waitForMwebAddresses() async {
// ensure that we have the full 1000 mweb addresses generated before continuing:
// should no longer be needed, but leaving here just in case
final mwebAddrs = (walletAddresses as LitecoinWalletAddresses).mwebAddrs;
while (mwebAddrs.length < 1000) {
print("waiting for mweb addresses to finish generating...");
await Future.delayed(const Duration(milliseconds: 1000));
}
}
@action
@override
Future<void> startSync() async {
print("STARTING SYNC @@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
if (syncStatus is SyncronizingSyncStatus) {
return;
}
print("STARTING SYNC - MWEB ENABLED: $mwebEnabled");
try {
syncStatus = SyncronizingSyncStatus();
await subscribeForUpdates();
await updateFeeRates();
_feeRatesTimer?.cancel();
_feeRatesTimer =
Timer.periodic(const Duration(minutes: 1), (timer) async => await updateFeeRates());
if (!mwebEnabled) {
try {
await updateAllUnspents();
await updateTransactions();
await updateBalance();
syncStatus = SyncedSyncStatus();
} catch (e, s) {
print(e);
print(s);
syncStatus = FailedSyncStatus();
}
return;
}
await waitForMwebAddresses();
await getStub();
await processMwebUtxos();
await updateTransactions();
await updateUnspent();
await updateBalance();
} catch (e) {
print("failed to start mweb sync: $e");
syncStatus = FailedSyncStatus();
return;
}
_syncTimer?.cancel();
_syncTimer = Timer.periodic(const Duration(milliseconds: 1500), (timer) async {
if (syncStatus is FailedSyncStatus) return;
final nodeHeight =
await electrumClient.getCurrentBlockChainTip() ?? 0; // current block height of our node
final resp = await CwMweb.status(StatusRequest());
if (resp.blockHeaderHeight < nodeHeight) {
int h = resp.blockHeaderHeight;
syncStatus = SyncingSyncStatus(nodeHeight - h, h / nodeHeight);
} else if (resp.mwebHeaderHeight < nodeHeight) {
int h = resp.mwebHeaderHeight;
syncStatus = SyncingSyncStatus(nodeHeight - h, h / nodeHeight);
} else if (resp.mwebUtxosHeight < nodeHeight) {
syncStatus = SyncingSyncStatus(1, 0.999);
} else {
// prevent unnecessary reaction triggers:
if (syncStatus is! SyncedSyncStatus) {
syncStatus = SyncedSyncStatus();
}
if (resp.mwebUtxosHeight > walletInfo.restoreHeight) {
await walletInfo.updateRestoreHeight(resp.mwebUtxosHeight);
await checkMwebUtxosSpent();
// update the confirmations for each transaction:
for (final transaction in transactionHistory.transactions.values) {
if (transaction.isPending) continue;
int txHeight = transaction.height ?? resp.mwebUtxosHeight;
final confirmations = (resp.mwebUtxosHeight - txHeight) + 1;
if (transaction.confirmations == confirmations) continue;
transaction.confirmations = confirmations;
transactionHistory.addOne(transaction);
}
await transactionHistory.save();
}
return;
}
});
}
@action
@override
Future<void> stopSync() async {
_syncTimer?.cancel();
_utxoStream?.cancel();
_feeRatesTimer?.cancel();
await CwMweb.stop();
}
Future<void> initMwebUtxosBox() async {
final boxName = "${walletInfo.name.replaceAll(" ", "_")}_${MwebUtxo.boxName}";
mwebUtxosBox = await CakeHive.openBox<MwebUtxo>(boxName);
}
@override
Future<void> renameWalletFiles(String newWalletName) async {
// rename the hive box:
final oldBoxName = "${walletInfo.name.replaceAll(" ", "_")}_${MwebUtxo.boxName}";
final newBoxName = "${newWalletName.replaceAll(" ", "_")}_${MwebUtxo.boxName}";
final oldBox = await CakeHive.openBox<MwebUtxo>(oldBoxName);
mwebUtxosBox = await CakeHive.openBox<MwebUtxo>(newBoxName);
for (final key in oldBox.keys) {
await mwebUtxosBox.put(key, oldBox.get(key)!);
}
oldBox.deleteFromDisk();
await super.renameWalletFiles(newWalletName);
}
@action
@override
Future<void> rescan({
required int height,
int? chainTip,
ScanData? scanData,
bool? doSingleScan,
bool? usingElectrs,
}) async {
_syncTimer?.cancel();
int oldHeight = walletInfo.restoreHeight;
await walletInfo.updateRestoreHeight(height);
// go through mwebUtxos and clear any that are above the new restore height:
if (height == 0) {
await mwebUtxosBox.clear();
transactionHistory.clear();
} else {
for (final utxo in mwebUtxosBox.values) {
if (utxo.height > height) {
await mwebUtxosBox.delete(utxo.outputId);
}
}
// TODO: remove transactions that are above the new restore height!
}
// reset coin balances and txCount to 0:
unspentCoins.forEach((coin) {
if (coin.bitcoinAddressRecord is! BitcoinSilentPaymentAddressRecord)
coin.bitcoinAddressRecord.balance = 0;
coin.bitcoinAddressRecord.txCount = 0;
});
for (var addressRecord in walletAddresses.allAddresses) {
addressRecord.balance = 0;
addressRecord.txCount = 0;
}
await startSync();
}
@override
Future<void> init() async {
await super.init();
await initMwebUtxosBox();
}
Future<void> handleIncoming(MwebUtxo utxo, RpcClient stub) async {
final status = await stub.status(StatusRequest());
var date = DateTime.now();
var confirmations = 0;
if (utxo.height > 0) {
date = DateTime.fromMillisecondsSinceEpoch(utxo.blockTime * 1000);
confirmations = status.blockHeaderHeight - utxo.height + 1;
}
var tx = transactionHistory.transactions.values
.firstWhereOrNull((tx) => tx.outputAddresses?.contains(utxo.outputId) ?? false);
if (tx == null) {
tx = ElectrumTransactionInfo(
WalletType.litecoin,
id: utxo.outputId,
height: utxo.height,
amount: utxo.value.toInt(),
fee: 0,
direction: TransactionDirection.incoming,
isPending: utxo.height == 0,
date: date,
confirmations: confirmations,
inputAddresses: [],
outputAddresses: [utxo.outputId],
isReplaced: false,
);
}
// don't update the confirmations if the tx is updated by electrum:
if (tx.confirmations == 0 || utxo.height != 0) {
tx.height = utxo.height;
tx.isPending = utxo.height == 0;
tx.confirmations = confirmations;
}
bool isNew = transactionHistory.transactions[tx.id] == null;
if (!(tx.outputAddresses?.contains(utxo.address) ?? false)) {
tx.outputAddresses?.add(utxo.address);
isNew = true;
}
if (isNew) {
final addressRecord = walletAddresses.allAddresses
.firstWhereOrNull((addressRecord) => addressRecord.address == utxo.address);
if (addressRecord == null) {
print("we don't have this address in the wallet! ${utxo.address}");
return;
}
// if our address isn't in the inputs, update the txCount:
final inputAddresses = tx.inputAddresses ?? [];
if (!inputAddresses.contains(utxo.address)) {
addressRecord.txCount++;
}
addressRecord.balance += utxo.value.toInt();
addressRecord.setAsUsed();
}
transactionHistory.addOne(tx);
if (isNew) {
// update the unconfirmed balance when a new tx is added:
// we do this after adding the tx to the history so that sub address balances are updated correctly
// (since that calculation is based on the tx history)
await updateBalance();
}
}
Future<void> processMwebUtxos() async {
if (!mwebEnabled) {
return;
}
int restoreHeight = walletInfo.restoreHeight;
print("SCANNING FROM HEIGHT: $restoreHeight");
final req = UtxosRequest(scanSecret: scanSecret, fromHeight: restoreHeight);
// process new utxos as they come in:
_utxoStream?.cancel();
ResponseStream<Utxo>? responseStream = await CwMweb.utxos(req);
if (responseStream == null) {
throw Exception("failed to get utxos stream!");
}
_utxoStream = responseStream.listen((Utxo sUtxo) async {
final utxo = MwebUtxo(
address: sUtxo.address,
blockTime: sUtxo.blockTime,
height: sUtxo.height,
outputId: sUtxo.outputId,
value: sUtxo.value.toInt(),
);
// if (mwebUtxosBox.containsKey(utxo.outputId)) {
// // we've already stored this utxo, skip it:
// return;
// }
await updateUnspent();
await updateBalance();
final mwebAddrs = (walletAddresses as LitecoinWalletAddresses).mwebAddrs;
// don't process utxos with addresses that are not in the mwebAddrs list:
if (utxo.address.isNotEmpty && !mwebAddrs.contains(utxo.address)) {
return;
}
await mwebUtxosBox.put(utxo.outputId, utxo);
await handleIncoming(utxo, _stub);
});
}
Future<void> checkMwebUtxosSpent() async {
if (!mwebEnabled) {
return;
}
while ((await Future.wait(transactionHistory.transactions.values
.where((tx) => tx.direction == TransactionDirection.outgoing && tx.isPending)
.map(checkPendingTransaction)))
.any((x) => x));
final outputIds =
mwebUtxosBox.values.where((utxo) => utxo.height > 0).map((utxo) => utxo.outputId).toList();
final resp = await CwMweb.spent(SpentRequest(outputId: outputIds));
final spent = resp.outputId;
if (spent.isEmpty) return;
final status = await CwMweb.status(StatusRequest());
final height = await electrumClient.getCurrentBlockChainTip();
if (height == null || status.blockHeaderHeight != height) return;
if (status.mwebUtxosHeight != height) return;
int amount = 0;
Set<String> inputAddresses = {};
var output = convert.AccumulatorSink<Digest>();
var input = sha256.startChunkedConversion(output);
for (final outputId in spent) {
final utxo = mwebUtxosBox.get(outputId);
await mwebUtxosBox.delete(outputId);
if (utxo == null) continue;
final addressRecord = walletAddresses.allAddresses
.firstWhere((addressRecord) => addressRecord.address == utxo.address);
if (!inputAddresses.contains(utxo.address)) {
addressRecord.txCount++;
}
addressRecord.balance -= utxo.value.toInt();
amount += utxo.value.toInt();
inputAddresses.add(utxo.address);
input.add(hex.decode(outputId));
}
if (inputAddresses.isEmpty) return;
input.close();
var digest = output.events.single;
final tx = ElectrumTransactionInfo(
WalletType.litecoin,
id: digest.toString(),
height: height,
amount: amount,
fee: 0,
direction: TransactionDirection.outgoing,
isPending: false,
date: DateTime.fromMillisecondsSinceEpoch(status.blockTime * 1000),
confirmations: 1,
inputAddresses: inputAddresses.toList(),
outputAddresses: [],
isReplaced: false,
);
transactionHistory.addOne(tx);
await transactionHistory.save();
}
Future<bool> checkPendingTransaction(ElectrumTransactionInfo tx) async {
if (!mwebEnabled) return false;
if (!tx.isPending) return false;
final outputId = <String>[], target = <String>{};
final isHash = RegExp(r'^[a-f0-9]{64}$').hasMatch;
final spendingOutputIds = tx.inputAddresses?.where(isHash) ?? [];
final payingToOutputIds = tx.outputAddresses?.where(isHash) ?? [];
outputId.addAll(spendingOutputIds);
outputId.addAll(payingToOutputIds);
target.addAll(spendingOutputIds);
for (final outputId in payingToOutputIds) {
final spendingTx = transactionHistory.transactions.values
.firstWhereOrNull((tx) => tx.inputAddresses?.contains(outputId) ?? false);
if (spendingTx != null && !spendingTx.isPending) {
target.add(outputId);
}
}
if (outputId.isEmpty) {
return false;
}
final resp = await CwMweb.spent(SpentRequest(outputId: outputId));
if (!setEquals(resp.outputId.toSet(), target)) return false;
final status = await CwMweb.status(StatusRequest());
if (!tx.isPending) return false;
tx.height = status.mwebUtxosHeight;
tx.confirmations = 1;
tx.isPending = false;
await transactionHistory.save();
return true;
}
Future<void> updateUnspent() async {
await checkMwebUtxosSpent();
await updateAllUnspents();
}
@override
@action
Future<void> updateAllUnspents() async {
// get ltc unspents:
await super.updateAllUnspents();
if (!mwebEnabled) {
return;
}
await getStub();
// add the mweb unspents to the list:
List<BitcoinUnspent> mwebUnspentCoins = [];
// update mweb unspents:
final mwebAddrs = (walletAddresses as LitecoinWalletAddresses).mwebAddrs;
mwebUtxosBox.keys.forEach((dynamic oId) {
final String outputId = oId as String;
final utxo = mwebUtxosBox.get(outputId);
if (utxo == null) {
return;
}
if (utxo.address.isEmpty) {
// not sure if a bug or a special case but we definitely ignore these
return;
}
final addressRecord = walletAddresses.allAddresses
.firstWhereOrNull((addressRecord) => addressRecord.address == utxo.address);
if (addressRecord == null) {
print("utxo contains an address that is not in the wallet: ${utxo.address}");
return;
}
final unspent = BitcoinUnspent(
addressRecord,
outputId,
utxo.value.toInt(),
mwebAddrs.indexOf(utxo.address),
);
if (unspent.vout == 0) {
unspent.isChange = true;
}
mwebUnspentCoins.add(unspent);
});
unspentCoins.addAll(mwebUnspentCoins);
}
@override
Future<ElectrumBalance> fetchBalances() async {
final balance = await super.fetchBalances();
if (!mwebEnabled) {
return balance;
}
await getStub();
int confirmed = balance.confirmed;
int unconfirmed = balance.unconfirmed;
int confirmedMweb = 0;
int unconfirmedMweb = 0;
try {
mwebUtxosBox.values.forEach((utxo) {
if (utxo.height > 0) {
confirmedMweb += utxo.value.toInt();
} else {
unconfirmedMweb += utxo.value.toInt();
}
});
if (unconfirmedMweb > 0) {
unconfirmedMweb = -1 * (confirmedMweb - unconfirmedMweb);
}
} catch (_) {}
// update unspent balances:
await updateUnspent();
for (var addressRecord in walletAddresses.allAddresses) {
addressRecord.balance = 0;
addressRecord.txCount = 0;
}
unspentCoins.forEach((coin) {
final coinInfoList = unspentCoinsInfo.values.where(
(element) =>
element.walletId.contains(id) &&
element.hash.contains(coin.hash) &&
element.vout == coin.vout,
);
if (coinInfoList.isNotEmpty) {
final coinInfo = coinInfoList.first;
coin.isFrozen = coinInfo.isFrozen;
coin.isSending = coinInfo.isSending;
coin.note = coinInfo.note;
if (coin.bitcoinAddressRecord is! BitcoinSilentPaymentAddressRecord)
coin.bitcoinAddressRecord.balance += coinInfo.value;
} else {
super.addCoinInfo(coin);
}
});
// update the txCount for each address using the tx history, since we can't rely on mwebd
// to have an accurate count, we should just keep it in sync with what we know from the tx history:
for (final tx in transactionHistory.transactions.values) {
// if (tx.isPending) continue;
if (tx.inputAddresses == null || tx.outputAddresses == null) {
continue;
}
final txAddresses = tx.inputAddresses! + tx.outputAddresses!;
for (final address in txAddresses) {
final addressRecord = walletAddresses.allAddresses
.firstWhereOrNull((addressRecord) => addressRecord.address == address);
if (addressRecord == null) {
continue;
}
addressRecord.txCount++;
}
}
return ElectrumBalance(
confirmed: confirmed,
unconfirmed: unconfirmed,
frozen: balance.frozen,
secondConfirmed: confirmedMweb,
secondUnconfirmed: unconfirmedMweb,
);
}
@override
int feeRate(TransactionPriority priority) {
if (priority is LitecoinTransactionPriority) {
switch (priority) {
case LitecoinTransactionPriority.slow:
return 1;
case LitecoinTransactionPriority.medium:
return 2;
case LitecoinTransactionPriority.fast:
return 3;
}
}
return 0;
}
@override
Future<int> calcFee({
required List<UtxoWithAddress> utxos,
required List<BitcoinBaseOutput> outputs,
required BasedUtxoNetwork network,
String? memo,
required int feeRate,
List<ECPrivateInfo>? inputPrivKeyInfos,
List<Outpoint>? vinOutpoints,
}) async {
final spendsMweb = utxos.any((utxo) => utxo.utxo.scriptType == SegwitAddresType.mweb);
final paysToMweb = outputs
.any((output) => output.toOutput.scriptPubKey.getAddressType() == SegwitAddresType.mweb);
if (!spendsMweb && !paysToMweb) {
return await super.calcFee(
utxos: utxos,
outputs: outputs,
network: network,
memo: memo,
feeRate: feeRate,
inputPrivKeyInfos: inputPrivKeyInfos,
vinOutpoints: vinOutpoints,
);
}
if (!mwebEnabled) {
throw Exception("MWEB is not enabled! can't calculate fee without starting the mweb server!");
}
if (outputs.length == 1 && outputs[0].toOutput.amount == BigInt.zero) {
outputs = [
BitcoinScriptOutput(
script: outputs[0].toOutput.scriptPubKey, value: utxos.sumOfUtxosValue())
];
}
// https://github.com/ltcmweb/mwebd?tab=readme-ov-file#fee-estimation
final preOutputSum =
outputs.fold<BigInt>(BigInt.zero, (acc, output) => acc + output.toOutput.amount);
final fee = utxos.sumOfUtxosValue() - preOutputSum;
final txb =
BitcoinTransactionBuilder(utxos: utxos, outputs: outputs, fee: fee, network: network);
final resp = await CwMweb.create(CreateRequest(
rawTx: txb.buildTransaction((a, b, c, d) => '').toBytes(),
scanSecret: scanSecret,
spendSecret: spendSecret,
feeRatePerKb: Int64(feeRate * 1000),
dryRun: true));
final tx = BtcTransaction.fromRaw(hex.encode(resp.rawTx));
final posUtxos = utxos
.where((utxo) => tx.inputs
.any((input) => input.txId == utxo.utxo.txHash && input.txIndex == utxo.utxo.vout))
.toList();
final posOutputSum = tx.outputs.fold<int>(0, (acc, output) => acc + output.amount.toInt());
final mwebInputSum = utxos.sumOfUtxosValue() - posUtxos.sumOfUtxosValue();
final expectedPegin = max(0, (preOutputSum - mwebInputSum).toInt());
var feeIncrease = posOutputSum - expectedPegin;
if (expectedPegin > 0 && fee == BigInt.zero) {
feeIncrease += await super.calcFee(
utxos: posUtxos,
outputs: tx.outputs
.map((output) =>
BitcoinScriptOutput(script: output.scriptPubKey, value: output.amount))
.toList(),
network: network,
memo: memo,
feeRate: feeRate) +
feeRate * 41;
}
return fee.toInt() + feeIncrease;
}
@override
Future<PendingTransaction> createTransaction(Object credentials) async {
try {
var tx = await super.createTransaction(credentials) as PendingBitcoinTransaction;
tx.isMweb = mwebEnabled;
if (!mwebEnabled) {
return tx;
}
await waitForMwebAddresses();
await getStub();
final resp = await CwMweb.create(CreateRequest(
rawTx: hex.decode(tx.hex),
scanSecret: scanSecret,
spendSecret: spendSecret,
feeRatePerKb: Int64.parseInt(tx.feeRate) * 1000,
));
final tx2 = BtcTransaction.fromRaw(hex.encode(resp.rawTx));
// check if any of the inputs of this transaction are hog-ex:
tx2.inputs.forEach((txInput) {
bool isHogEx = true;
final utxo = unspentCoins
.firstWhere((utxo) => utxo.hash == txInput.txId && utxo.vout == txInput.txIndex);
// TODO: detect actual hog-ex inputs
if (!isHogEx) {
return;
}
int confirmations = utxo.confirmations ?? 0;
if (confirmations < 6) {
throw Exception(
"A transaction input has less than 6 confirmations, please try again later.");
}
});
tx.hexOverride = tx2
.copyWith(
witnesses: tx2.inputs.asMap().entries.map((e) {
final utxo = unspentCoins
.firstWhere((utxo) => utxo.hash == e.value.txId && utxo.vout == e.value.txIndex);
final key = generateECPrivate(
hd: utxo.bitcoinAddressRecord.isHidden
? walletAddresses.sideHd
: walletAddresses.mainHd,
index: utxo.bitcoinAddressRecord.index,
network: network);
final digest = tx2.getTransactionSegwitDigit(
txInIndex: e.key,
script: key.getPublic().toP2pkhAddress().toScriptPubKey(),
amount: BigInt.from(utxo.value),
);
return TxWitnessInput(stack: [key.signInput(digest), key.getPublic().toHex()]);
}).toList())
.toHex();
tx.outputAddresses = resp.outputId;
return tx
..addListener((transaction) async {
final addresses = <String>{};
transaction.inputAddresses?.forEach((id) async {
final utxo = mwebUtxosBox.get(id);
// await mwebUtxosBox.delete(id);// gets deleted in checkMwebUtxosSpent
if (utxo == null) return;
final addressRecord = walletAddresses.allAddresses
.firstWhere((addressRecord) => addressRecord.address == utxo.address);
if (!addresses.contains(utxo.address)) {
addresses.add(utxo.address);
}
addressRecord.balance -= utxo.value.toInt();
});
transaction.inputAddresses?.addAll(addresses);
transactionHistory.addOne(transaction);
await updateUnspent();
await updateBalance();
});
} catch (e, s) {
print(e);
print(s);
if (e.toString().contains("commit failed")) {
throw Exception("Transaction commit failed (no peers responded), please try again.");
}
rethrow;
}
}
@override
Future<void> save() async {
await super.save();
}
@override
Future<void> close() async {
_utxoStream?.cancel();
_feeRatesTimer?.cancel();
_syncTimer?.cancel();
await stopSync();
await super.close();
}
Future<void> setMwebEnabled(bool enabled) async {
if (mwebEnabled == enabled) {
return;
}
mwebEnabled = enabled;
(walletAddresses as LitecoinWalletAddresses).mwebEnabled = enabled;
await stopSync();
await startSync();
}
Future<RpcClient> getStub() async {
_stub = await CwMweb.stub();
return _stub;
}
Future<StatusResponse> getStatusRequest() async {
final resp = await CwMweb.status(StatusRequest());
return resp;
}
@override
Future<String> signMessage(String message, {String? address = null}) async {
final index = address != null
? walletAddresses.allAddresses.firstWhere((element) => element.address == address).index
: null;
final HD = index == null ? hd : hd.childKey(Bip32KeyIndex(index));
final priv = ECPrivate.fromHex(HD.privateKey.privKey.toHex());
final privateKey = ECDSAPrivateKey.fromBytes(
priv.toBytes(),
Curves.generatorSecp256k1,
);
final signature =
signLitecoinMessage(utf8.encode(message), privateKey: privateKey, bipPrive: priv.prive);
return base64Encode(signature);
}
List<int> _magicPrefix(List<int> message, List<int> messagePrefix) {
final encodeLength = IntUtils.encodeVarint(message.length);
return [...messagePrefix, ...encodeLength, ...message];
}
List<int> signLitecoinMessage(List<int> message,
{required ECDSAPrivateKey privateKey, required Bip32PrivateKey bipPrive}) {
String messagePrefix = '\x19Litecoin Signed Message:\n';
final messageHash = QuickCrypto.sha256Hash(magicMessage(message, messagePrefix));
final signingKey = EcdsaSigningKey(privateKey);
ECDSASignature ecdsaSign =
signingKey.signDigestDeterminstic(digest: messageHash, hashFunc: () => SHA256());
final n = Curves.generatorSecp256k1.order! >> 1;
BigInt newS;
if (ecdsaSign.s.compareTo(n) > 0) {
newS = Curves.generatorSecp256k1.order! - ecdsaSign.s;
} else {
newS = ecdsaSign.s;
}
final rawSig = ECDSASignature(ecdsaSign.r, newS);
final rawSigBytes = rawSig.toBytes(BitcoinSignerUtils.baselen);
final pub = bipPrive.publicKey;
final ECDomainParameters curve = ECCurve_secp256k1();
final point = curve.curve.decodePoint(pub.point.toBytes());
final rawSigEc = ECSignature(rawSig.r, rawSig.s);
final recId = SignUtils.findRecoveryId(
SignUtils.getHexString(messageHash, offset: 0, length: messageHash.length),
rawSigEc,
Uint8List.fromList(pub.uncompressed),
);
final v = recId + 27 + (point!.isCompressed ? 4 : 0);
final combined = Uint8List.fromList([v, ...rawSigBytes]);
return combined;
}
List<int> magicMessage(List<int> message, String messagePrefix) {
final prefixBytes = StringUtils.encode(messagePrefix);
final magic = _magicPrefix(message, prefixBytes);
return QuickCrypto.sha256Hash(magic);
}
@override
Future<bool> verifyMessage(String message, String signature, {String? address = null}) async {
if (address == null) {
return false;
}
List<int> sigDecodedBytes = [];
if (signature.endsWith('=')) {
sigDecodedBytes = base64.decode(signature);
} else {
sigDecodedBytes = hex.decode(signature);
}
if (sigDecodedBytes.length != 64 && sigDecodedBytes.length != 65) {
throw ArgumentException(
"litecoin signature must be 64 bytes without recover-id or 65 bytes with recover-id");
}
String messagePrefix = '\x19Litecoin Signed Message:\n';
final messageHash = QuickCrypto.sha256Hash(magicMessage(utf8.encode(message), messagePrefix));
List<int> correctSignature =
sigDecodedBytes.length == 65 ? sigDecodedBytes.sublist(1) : List.from(sigDecodedBytes);
List<int> rBytes = correctSignature.sublist(0, 32);
List<int> sBytes = correctSignature.sublist(32);
final sig = ECDSASignature(BigintUtils.fromBytes(rBytes), BigintUtils.fromBytes(sBytes));
List<int> possibleRecoverIds = [0, 1];
final baseAddress = RegexUtils.addressTypeFromStr(address, network);
for (int recoveryId in possibleRecoverIds) {
final pubKey = sig.recoverPublicKey(messageHash, Curves.generatorSecp256k1, recoveryId);
final recoveredPub = ECPublic.fromBytes(pubKey!.toBytes());
String? recoveredAddress;
if (baseAddress is P2pkAddress) {
recoveredAddress = recoveredPub.toP2pkAddress().toAddress(network);
} else if (baseAddress is P2pkhAddress) {
recoveredAddress = recoveredPub.toP2pkhAddress().toAddress(network);
} else if (baseAddress is P2wshAddress) {
recoveredAddress = recoveredPub.toP2wshAddress().toAddress(network);
} else if (baseAddress is P2wpkhAddress) {
recoveredAddress = recoveredPub.toP2wpkhAddress().toAddress(network);
}
if (recoveredAddress == address) {
return true;
}
}
return false;
}
}