import 'dart:async'; import 'dart:convert'; import 'dart:io'; import 'dart:math'; import 'package:bech32/bech32.dart'; import 'package:bip32/bip32.dart' as bip32; import 'package:bip39/bip39.dart' as bip39; import 'package:bitcoindart/bitcoindart.dart'; import 'package:bs58check/bs58check.dart' as bs58check; import 'package:decimal/decimal.dart'; import 'package:flutter/foundation.dart'; import 'package:isar/isar.dart'; import 'package:stackwallet/db/main_db.dart'; import 'package:stackwallet/electrumx_rpc/cached_electrumx.dart'; import 'package:stackwallet/electrumx_rpc/electrumx.dart'; import 'package:stackwallet/exceptions/electrumx/no_such_transaction.dart'; import 'package:stackwallet/models/balance.dart'; import 'package:stackwallet/models/isar/models/isar_models.dart' as isar_models; import 'package:stackwallet/models/paymint/fee_object_model.dart'; import 'package:stackwallet/services/coins/coin_service.dart'; import 'package:stackwallet/services/event_bus/events/global/node_connection_status_changed_event.dart'; import 'package:stackwallet/services/event_bus/events/global/refresh_percent_changed_event.dart'; import 'package:stackwallet/services/event_bus/events/global/updated_in_background_event.dart'; import 'package:stackwallet/services/event_bus/events/global/wallet_sync_status_changed_event.dart'; import 'package:stackwallet/services/event_bus/global_event_bus.dart'; import 'package:stackwallet/services/mixins/electrum_x_parsing.dart'; import 'package:stackwallet/services/mixins/paynym_wallet_interface.dart'; import 'package:stackwallet/services/mixins/wallet_cache.dart'; import 'package:stackwallet/services/mixins/wallet_db.dart'; import 'package:stackwallet/services/node_service.dart'; import 'package:stackwallet/services/notifications_api.dart'; import 'package:stackwallet/services/transaction_notification_tracker.dart'; import 'package:stackwallet/utilities/address_utils.dart'; import 'package:stackwallet/utilities/assets.dart'; import 'package:stackwallet/utilities/bip32_utils.dart'; import 'package:stackwallet/utilities/constants.dart'; import 'package:stackwallet/utilities/default_nodes.dart'; import 'package:stackwallet/utilities/enums/coin_enum.dart'; import 'package:stackwallet/utilities/enums/derive_path_type_enum.dart'; import 'package:stackwallet/utilities/enums/fee_rate_type_enum.dart'; import 'package:stackwallet/utilities/flutter_secure_storage_interface.dart'; import 'package:stackwallet/utilities/format.dart'; import 'package:stackwallet/utilities/logger.dart'; import 'package:stackwallet/utilities/paynym_is_api.dart'; import 'package:stackwallet/utilities/prefs.dart'; import 'package:tuple/tuple.dart'; import 'package:uuid/uuid.dart'; const int MINIMUM_CONFIRMATIONS = 1; const int DUST_LIMIT = 294; const int DUST_LIMIT_P2PKH = 546; const String GENESIS_HASH_MAINNET = "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"; const String GENESIS_HASH_TESTNET = "000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943"; String constructDerivePath({ required DerivePathType derivePathType, required int networkWIF, int account = 0, required int chain, required int index, }) { String coinType; switch (networkWIF) { case 0x80: // btc mainnet wif coinType = "0"; // btc mainnet break; case 0xef: // btc testnet wif coinType = "1"; // btc testnet break; default: throw Exception("Invalid Bitcoin network wif used!"); } int purpose; switch (derivePathType) { case DerivePathType.bip44: purpose = 44; break; case DerivePathType.bip49: purpose = 49; break; case DerivePathType.bip84: purpose = 84; break; default: throw Exception("DerivePathType $derivePathType not supported"); } return "m/$purpose'/$coinType'/$account'/$chain/$index"; } class BitcoinWallet extends CoinServiceAPI with WalletCache, WalletDB, ElectrumXParsing, PaynymWalletInterface { BitcoinWallet({ required String walletId, required String walletName, required Coin coin, required ElectrumX client, required CachedElectrumX cachedClient, required TransactionNotificationTracker tracker, required SecureStorageInterface secureStore, MainDB? mockableOverride, }) { txTracker = tracker; _walletId = walletId; _walletName = walletName; _coin = coin; _electrumXClient = client; _cachedElectrumXClient = cachedClient; _secureStore = secureStore; initCache(walletId, coin); initWalletDB(mockableOverride: mockableOverride); initPaynymWalletInterface( walletId: walletId, walletName: walletName, network: _network, coin: coin, db: db, electrumXClient: electrumXClient, secureStorage: secureStore, getMnemonicString: () => mnemonicString, getMnemonicPassphrase: () => mnemonicPassphrase, getChainHeight: () => chainHeight, getCurrentChangeAddress: () => currentChangeAddressP2PKH, estimateTxFee: estimateTxFee, prepareSend: prepareSend, getTxCount: getTxCount, fetchBuildTxData: fetchBuildTxData, refresh: refresh, checkChangeAddressForTransactions: _checkP2PKHChangeAddressForTransactions, addDerivation: addDerivation, dustLimitP2PKH: DUST_LIMIT_P2PKH, minConfirms: MINIMUM_CONFIRMATIONS, ); } static const integrationTestFlag = bool.fromEnvironment("IS_INTEGRATION_TEST"); final _prefs = Prefs.instance; Timer? timer; late final Coin _coin; late final TransactionNotificationTracker txTracker; NetworkType get _network { switch (coin) { case Coin.bitcoin: return bitcoin; case Coin.bitcoinTestNet: return testnet; default: throw Exception("Invalid network type!"); } } @override set isFavorite(bool markFavorite) { _isFavorite = markFavorite; updateCachedIsFavorite(markFavorite); } @override bool get isFavorite => _isFavorite ??= getCachedIsFavorite(); bool? _isFavorite; @override Coin get coin => _coin; @override Future> get utxos => db.getUTXOs(walletId).findAll(); @override Future> get transactions => db .getTransactions(walletId) .filter() .not() .group((q) => q .subTypeEqualTo(isar_models.TransactionSubType.bip47Notification) .and() .typeEqualTo(isar_models.TransactionType.incoming)) .sortByTimestampDesc() .findAll(); @override Future get currentReceivingAddress async => (await _currentReceivingAddress).value; Future get _currentReceivingAddress async => (await db .getAddresses(walletId) .filter() .typeEqualTo(isar_models.AddressType.p2wpkh) .subTypeEqualTo(isar_models.AddressSubType.receiving) .sortByDerivationIndexDesc() .findFirst()) ?? await _generateAddressForChain(0, 0, DerivePathTypeExt.primaryFor(coin)); Future get currentChangeAddress async => (await _currentChangeAddress).value; Future get _currentChangeAddress async => (await db .getAddresses(walletId) .filter() .typeEqualTo(isar_models.AddressType.p2wpkh) .subTypeEqualTo(isar_models.AddressSubType.change) .sortByDerivationIndexDesc() .findFirst()) ?? await _generateAddressForChain(1, 0, DerivePathTypeExt.primaryFor(coin)); Future get currentChangeAddressP2PKH async => (await _currentChangeAddressP2PKH).value; Future get _currentChangeAddressP2PKH async => (await db .getAddresses(walletId) .filter() .typeEqualTo(isar_models.AddressType.p2pkh) .subTypeEqualTo(isar_models.AddressSubType.change) .sortByDerivationIndexDesc() .findFirst()) ?? await _generateAddressForChain(1, 0, DerivePathType.bip44); @override Future exit() async { _hasCalledExit = true; timer?.cancel(); timer = null; stopNetworkAlivePinging(); } bool _hasCalledExit = false; @override bool get hasCalledExit => _hasCalledExit; @override Future get fees => _feeObject ??= _getFees(); Future? _feeObject; @override Future get maxFee async { final fee = (await fees).fast as String; final satsFee = Decimal.parse(fee) * Decimal.fromInt(Constants.satsPerCoin(coin)); return satsFee.floor().toBigInt().toInt(); } @override Future> get mnemonic => _getMnemonicList(); @override Future get mnemonicString => _secureStore.read(key: '${_walletId}_mnemonic'); @override Future get mnemonicPassphrase => _secureStore.read( key: '${_walletId}_mnemonicPassphrase', ); Future get chainHeight async { try { final result = await _electrumXClient.getBlockHeadTip(); final height = result["height"] as int; await updateCachedChainHeight(height); if (height > storedChainHeight) { GlobalEventBus.instance.fire( UpdatedInBackgroundEvent( "Updated current chain height in $walletId $walletName!", walletId, ), ); } return height; } catch (e, s) { Logging.instance.log("Exception caught in chainHeight: $e\n$s", level: LogLevel.Error); return storedChainHeight; } } @override int get storedChainHeight => getCachedChainHeight(); DerivePathType addressType({required String address}) { Uint8List? decodeBase58; Segwit? decodeBech32; try { decodeBase58 = bs58check.decode(address); } catch (err) { // Base58check decode fail } if (decodeBase58 != null) { if (decodeBase58[0] == _network.pubKeyHash) { // P2PKH return DerivePathType.bip44; } if (decodeBase58[0] == _network.scriptHash) { // P2SH return DerivePathType.bip49; } throw ArgumentError('Invalid version or Network mismatch'); } else { try { decodeBech32 = segwit.decode(address); } catch (err) { // Bech32 decode fail } if (_network.bech32 != decodeBech32!.hrp) { throw ArgumentError('Invalid prefix or Network mismatch'); } if (decodeBech32.version != 0) { throw ArgumentError('Invalid address version'); } // P2WPKH return DerivePathType.bip84; } } bool longMutex = false; @override Future recoverFromMnemonic({ required String mnemonic, String? mnemonicPassphrase, required int maxUnusedAddressGap, required int maxNumberOfIndexesToCheck, required int height, }) async { longMutex = true; final start = DateTime.now(); try { Logging.instance.log("IS_INTEGRATION_TEST: $integrationTestFlag", level: LogLevel.Info); if (!integrationTestFlag) { final features = await electrumXClient.getServerFeatures(); Logging.instance.log("features: $features", level: LogLevel.Info); switch (coin) { case Coin.bitcoin: if (features['genesis_hash'] != GENESIS_HASH_MAINNET) { throw Exception("genesis hash does not match main net!"); } break; case Coin.bitcoinTestNet: if (features['genesis_hash'] != GENESIS_HASH_TESTNET) { throw Exception("genesis hash does not match test net!"); } break; default: throw Exception( "Attempted to generate a BitcoinWallet using a non bitcoin coin type: ${coin.name}"); } } // check to make sure we aren't overwriting a mnemonic // this should never fail if ((await mnemonicString) != null || (await this.mnemonicPassphrase) != null) { longMutex = false; throw Exception("Attempted to overwrite mnemonic on restore!"); } await _secureStore.write( key: '${_walletId}_mnemonic', value: mnemonic.trim()); await _secureStore.write( key: '${_walletId}_mnemonicPassphrase', value: mnemonicPassphrase ?? "", ); await _recoverWalletFromBIP32SeedPhrase( mnemonic: mnemonic.trim(), mnemonicPassphrase: mnemonicPassphrase ?? "", maxUnusedAddressGap: maxUnusedAddressGap, maxNumberOfIndexesToCheck: maxNumberOfIndexesToCheck, ); } catch (e, s) { Logging.instance.log( "Exception rethrown from recoverFromMnemonic(): $e\n$s", level: LogLevel.Error); longMutex = false; rethrow; } longMutex = false; final end = DateTime.now(); Logging.instance.log( "$walletName recovery time: ${end.difference(start).inMilliseconds} millis", level: LogLevel.Info); } Future> _checkGaps( int maxNumberOfIndexesToCheck, int maxUnusedAddressGap, int txCountBatchSize, bip32.BIP32 root, DerivePathType type, int chain) async { List addressArray = []; int returningIndex = -1; Map> derivations = {}; int gapCounter = 0; for (int index = 0; index < maxNumberOfIndexesToCheck && gapCounter < maxUnusedAddressGap; index += txCountBatchSize) { List iterationsAddressArray = []; Logging.instance.log( "index: $index, \t GapCounter $chain ${type.name}: $gapCounter", level: LogLevel.Info); final _id = "k_$index"; Map txCountCallArgs = {}; final Map receivingNodes = {}; for (int j = 0; j < txCountBatchSize; j++) { final derivePath = constructDerivePath( derivePathType: type, networkWIF: root.network.wif, chain: chain, index: index + j, ); final node = await Bip32Utils.getBip32NodeFromRoot(root, derivePath); String addressString; final data = PaymentData(pubkey: node.publicKey); isar_models.AddressType addrType; switch (type) { case DerivePathType.bip44: addressString = P2PKH(data: data, network: _network).data.address!; addrType = isar_models.AddressType.p2pkh; break; case DerivePathType.bip49: addressString = P2SH( data: PaymentData( redeem: P2WPKH(data: data, network: _network).data), network: _network) .data .address!; addrType = isar_models.AddressType.p2sh; break; case DerivePathType.bip84: addressString = P2WPKH(network: _network, data: data).data.address!; addrType = isar_models.AddressType.p2wpkh; break; default: throw Exception("DerivePathType $type not supported"); } final address = isar_models.Address( walletId: walletId, value: addressString, publicKey: node.publicKey, type: addrType, derivationIndex: index + j, derivationPath: isar_models.DerivationPath()..value = derivePath, subType: chain == 0 ? isar_models.AddressSubType.receiving : isar_models.AddressSubType.change, ); receivingNodes.addAll({ "${_id}_$j": { "node": node, "address": address, } }); txCountCallArgs.addAll({ "${_id}_$j": addressString, }); } // get address tx counts final counts = await _getBatchTxCount(addresses: txCountCallArgs); // check and add appropriate addresses for (int k = 0; k < txCountBatchSize; k++) { int count = counts["${_id}_$k"]!; if (count > 0) { final node = receivingNodes["${_id}_$k"]; final address = node["address"] as isar_models.Address; // add address to array addressArray.add(address); iterationsAddressArray.add(address.value); // set current index returningIndex = index + k; // reset counter gapCounter = 0; // add info to derivations derivations[address.value] = { "pubKey": Format.uint8listToString( (node["node"] as bip32.BIP32).publicKey), "wif": (node["node"] as bip32.BIP32).toWIF(), }; } // increase counter when no tx history found if (count == 0) { gapCounter++; } } // cache all the transactions while waiting for the current function to finish. unawaited(getTransactionCacheEarly(iterationsAddressArray)); } return { "addressArray": addressArray, "index": returningIndex, "derivations": derivations }; } Future getTransactionCacheEarly(List allAddresses) async { try { final List> allTxHashes = await _fetchHistory(allAddresses); for (final txHash in allTxHashes) { try { unawaited(cachedElectrumXClient.getTransaction( txHash: txHash["tx_hash"] as String, verbose: true, coin: coin, )); } catch (e) { continue; } } } catch (e) { // } } Future _recoverWalletFromBIP32SeedPhrase({ required String mnemonic, required String mnemonicPassphrase, int maxUnusedAddressGap = 20, int maxNumberOfIndexesToCheck = 1000, bool isRescan = false, }) async { longMutex = true; Map> p2pkhReceiveDerivations = {}; Map> p2shReceiveDerivations = {}; Map> p2wpkhReceiveDerivations = {}; Map> p2pkhChangeDerivations = {}; Map> p2shChangeDerivations = {}; Map> p2wpkhChangeDerivations = {}; final root = await Bip32Utils.getBip32Root( mnemonic, mnemonicPassphrase, _network, ); List p2pkhReceiveAddressArray = []; List p2shReceiveAddressArray = []; List p2wpkhReceiveAddressArray = []; int p2pkhReceiveIndex = -1; int p2shReceiveIndex = -1; int p2wpkhReceiveIndex = -1; List p2pkhChangeAddressArray = []; List p2shChangeAddressArray = []; List p2wpkhChangeAddressArray = []; int p2pkhChangeIndex = -1; int p2shChangeIndex = -1; int p2wpkhChangeIndex = -1; // actual size is 36 due to p2pkh, p2sh, and p2wpkh so 12x3 const txCountBatchSize = 12; try { // receiving addresses Logging.instance .log("checking receiving addresses...", level: LogLevel.Info); final resultReceive44 = _checkGaps(maxNumberOfIndexesToCheck, maxUnusedAddressGap, txCountBatchSize, root, DerivePathType.bip44, 0); final resultReceive49 = _checkGaps(maxNumberOfIndexesToCheck, maxUnusedAddressGap, txCountBatchSize, root, DerivePathType.bip49, 0); final resultReceive84 = _checkGaps(maxNumberOfIndexesToCheck, maxUnusedAddressGap, txCountBatchSize, root, DerivePathType.bip84, 0); Logging.instance .log("checking change addresses...", level: LogLevel.Info); // change addresses final resultChange44 = _checkGaps(maxNumberOfIndexesToCheck, maxUnusedAddressGap, txCountBatchSize, root, DerivePathType.bip44, 1); final resultChange49 = _checkGaps(maxNumberOfIndexesToCheck, maxUnusedAddressGap, txCountBatchSize, root, DerivePathType.bip49, 1); final resultChange84 = _checkGaps(maxNumberOfIndexesToCheck, maxUnusedAddressGap, txCountBatchSize, root, DerivePathType.bip84, 1); await Future.wait([ resultReceive44, resultReceive49, resultReceive84, resultChange44, resultChange49, resultChange84 ]); p2pkhReceiveAddressArray = (await resultReceive44)['addressArray'] as List; p2pkhReceiveIndex = (await resultReceive44)['index'] as int; p2pkhReceiveDerivations = (await resultReceive44)['derivations'] as Map>; p2shReceiveAddressArray = (await resultReceive49)['addressArray'] as List; p2shReceiveIndex = (await resultReceive49)['index'] as int; p2shReceiveDerivations = (await resultReceive49)['derivations'] as Map>; p2wpkhReceiveAddressArray = (await resultReceive84)['addressArray'] as List; p2wpkhReceiveIndex = (await resultReceive84)['index'] as int; p2wpkhReceiveDerivations = (await resultReceive84)['derivations'] as Map>; p2pkhChangeAddressArray = (await resultChange44)['addressArray'] as List; p2pkhChangeIndex = (await resultChange44)['index'] as int; p2pkhChangeDerivations = (await resultChange44)['derivations'] as Map>; p2shChangeAddressArray = (await resultChange49)['addressArray'] as List; p2shChangeIndex = (await resultChange49)['index'] as int; p2shChangeDerivations = (await resultChange49)['derivations'] as Map>; p2wpkhChangeAddressArray = (await resultChange84)['addressArray'] as List; p2wpkhChangeIndex = (await resultChange84)['index'] as int; p2wpkhChangeDerivations = (await resultChange84)['derivations'] as Map>; // save the derivations (if any) if (p2pkhReceiveDerivations.isNotEmpty) { await addDerivations( chain: 0, derivePathType: DerivePathType.bip44, derivationsToAdd: p2pkhReceiveDerivations); } if (p2shReceiveDerivations.isNotEmpty) { await addDerivations( chain: 0, derivePathType: DerivePathType.bip49, derivationsToAdd: p2shReceiveDerivations); } if (p2wpkhReceiveDerivations.isNotEmpty) { await addDerivations( chain: 0, derivePathType: DerivePathType.bip84, derivationsToAdd: p2wpkhReceiveDerivations); } if (p2pkhChangeDerivations.isNotEmpty) { await addDerivations( chain: 1, derivePathType: DerivePathType.bip44, derivationsToAdd: p2pkhChangeDerivations); } if (p2shChangeDerivations.isNotEmpty) { await addDerivations( chain: 1, derivePathType: DerivePathType.bip49, derivationsToAdd: p2shChangeDerivations); } if (p2wpkhChangeDerivations.isNotEmpty) { await addDerivations( chain: 1, derivePathType: DerivePathType.bip84, derivationsToAdd: p2wpkhChangeDerivations); } // If restoring a wallet that never received any funds, then set receivingArray manually // If we didn't do this, it'd store an empty array if (p2pkhReceiveIndex == -1) { final address = await _generateAddressForChain(0, 0, DerivePathType.bip44); p2pkhReceiveAddressArray.add(address); } if (p2shReceiveIndex == -1) { final address = await _generateAddressForChain(0, 0, DerivePathType.bip49); p2shReceiveAddressArray.add(address); } if (p2wpkhReceiveIndex == -1) { final address = await _generateAddressForChain(0, 0, DerivePathType.bip84); p2wpkhReceiveAddressArray.add(address); } // If restoring a wallet that never sent any funds with change, then set changeArray // manually. If we didn't do this, it'd store an empty array. if (p2pkhChangeIndex == -1) { final address = await _generateAddressForChain(1, 0, DerivePathType.bip44); p2pkhChangeAddressArray.add(address); } if (p2shChangeIndex == -1) { final address = await _generateAddressForChain(1, 0, DerivePathType.bip49); p2shChangeAddressArray.add(address); } if (p2wpkhChangeIndex == -1) { final address = await _generateAddressForChain(1, 0, DerivePathType.bip84); p2wpkhChangeAddressArray.add(address); } if (isRescan) { await db.updateOrPutAddresses([ ...p2wpkhReceiveAddressArray, ...p2wpkhChangeAddressArray, ...p2pkhReceiveAddressArray, ...p2pkhChangeAddressArray, ...p2shReceiveAddressArray, ...p2shChangeAddressArray, ]); } else { await db.putAddresses([ ...p2wpkhReceiveAddressArray, ...p2wpkhChangeAddressArray, ...p2pkhReceiveAddressArray, ...p2pkhChangeAddressArray, ...p2shReceiveAddressArray, ...p2shChangeAddressArray, ]); } // get own payment code final myCode = await getPaymentCode(DerivePathType.bip44); // refresh transactions to pick up any received notification transactions await _refreshTransactions(); try { final Set codesToCheck = {}; final nym = await PaynymIsApi().nym(myCode.toString()); if (nym.value != null) { for (final follower in nym.value!.followers) { codesToCheck.add(follower.code); } for (final following in nym.value!.following) { codesToCheck.add(following.code); } } // restore paynym transactions await restoreAllHistory( maxUnusedAddressGap: maxUnusedAddressGap, maxNumberOfIndexesToCheck: maxNumberOfIndexesToCheck, paymentCodeStrings: codesToCheck, ); } catch (e, s) { Logging.instance.log( "Failed to check paynym.is followers/following for history during " "bitcoin wallet ($walletId $walletName) " "_recoverWalletFromBIP32SeedPhrase: $e/n$s", level: LogLevel.Error, ); } await _updateUTXOs(); await Future.wait([ updateCachedId(walletId), updateCachedIsFavorite(false), ]); longMutex = false; } catch (e, s) { Logging.instance.log( "Exception rethrown from _recoverWalletFromBIP32SeedPhrase(): $e\n$s", level: LogLevel.Error); longMutex = false; rethrow; } } Future refreshIfThereIsNewData() async { if (longMutex) return false; if (_hasCalledExit) return false; Logging.instance.log("refreshIfThereIsNewData", level: LogLevel.Info); try { bool needsRefresh = false; Set txnsToCheck = {}; for (final String txid in txTracker.pendings) { if (!txTracker.wasNotifiedConfirmed(txid)) { txnsToCheck.add(txid); } } for (String txid in txnsToCheck) { final txn = await electrumXClient.getTransaction(txHash: txid); int confirmations = txn["confirmations"] as int? ?? 0; bool isUnconfirmed = confirmations < MINIMUM_CONFIRMATIONS; if (!isUnconfirmed) { // unconfirmedTxs = {}; needsRefresh = true; break; } } if (!needsRefresh) { final allOwnAddresses = await _fetchAllOwnAddresses(); List> allTxs = await _fetchHistory( allOwnAddresses.map((e) => e.value).toList(growable: false)); for (Map transaction in allTxs) { final txid = transaction['tx_hash'] as String; if ((await db .getTransactions(walletId) .filter() .txidMatches(txid) .findFirst()) == null) { Logging.instance.log( " txid not found in address history already ${transaction['tx_hash']}", level: LogLevel.Info); needsRefresh = true; break; } } } return needsRefresh; } on NoSuchTransactionException catch (e) { // TODO: move direct transactions elsewhere await db.isar.writeTxn(() async { await db.isar.transactions.deleteByTxidWalletId(e.txid, walletId); }); await txTracker.deleteTransaction(e.txid); return true; } catch (e, s) { Logging.instance.log( "Exception caught in refreshIfThereIsNewData: $e\n$s", level: LogLevel.Error); rethrow; } } Future getAllTxsToWatch() async { if (_hasCalledExit) return; List unconfirmedTxnsToNotifyPending = []; List unconfirmedTxnsToNotifyConfirmed = []; final currentChainHeight = await chainHeight; final txCount = await db.getTransactions(walletId).count(); const paginateLimit = 50; for (int i = 0; i < txCount; i += paginateLimit) { final transactions = await db .getTransactions(walletId) .offset(i) .limit(paginateLimit) .findAll(); for (final tx in transactions) { if (tx.isConfirmed(currentChainHeight, MINIMUM_CONFIRMATIONS)) { // get all transactions that were notified as pending but not as confirmed if (txTracker.wasNotifiedPending(tx.txid) && !txTracker.wasNotifiedConfirmed(tx.txid)) { unconfirmedTxnsToNotifyConfirmed.add(tx); } } else { // get all transactions that were not notified as pending yet if (!txTracker.wasNotifiedPending(tx.txid)) { unconfirmedTxnsToNotifyPending.add(tx); } } } } // notify on unconfirmed transactions for (final tx in unconfirmedTxnsToNotifyPending) { final confirmations = tx.getConfirmations(currentChainHeight); if (tx.type == isar_models.TransactionType.incoming) { unawaited(NotificationApi.showNotification( title: "Incoming transaction", body: walletName, walletId: walletId, iconAssetName: Assets.svg.iconFor(coin: coin), date: DateTime.fromMillisecondsSinceEpoch(tx.timestamp * 1000), shouldWatchForUpdates: confirmations < MINIMUM_CONFIRMATIONS, coinName: coin.name, txid: tx.txid, confirmations: confirmations, requiredConfirmations: MINIMUM_CONFIRMATIONS, )); await txTracker.addNotifiedPending(tx.txid); } else if (tx.type == isar_models.TransactionType.outgoing) { unawaited(NotificationApi.showNotification( title: "Sending transaction", body: walletName, walletId: walletId, iconAssetName: Assets.svg.iconFor(coin: coin), date: DateTime.fromMillisecondsSinceEpoch(tx.timestamp * 1000), shouldWatchForUpdates: confirmations < MINIMUM_CONFIRMATIONS, coinName: coin.name, txid: tx.txid, confirmations: confirmations, requiredConfirmations: MINIMUM_CONFIRMATIONS, )); await txTracker.addNotifiedPending(tx.txid); } } // notify on confirmed for (final tx in unconfirmedTxnsToNotifyConfirmed) { if (tx.type == isar_models.TransactionType.incoming) { unawaited(NotificationApi.showNotification( title: "Incoming transaction confirmed", body: walletName, walletId: walletId, iconAssetName: Assets.svg.iconFor(coin: coin), date: DateTime.fromMillisecondsSinceEpoch(tx.timestamp * 1000), shouldWatchForUpdates: false, coinName: coin.name, )); await txTracker.addNotifiedConfirmed(tx.txid); } else if (tx.type == isar_models.TransactionType.outgoing) { unawaited(NotificationApi.showNotification( title: "Outgoing transaction confirmed", body: walletName, walletId: walletId, iconAssetName: Assets.svg.iconFor(coin: coin), date: DateTime.fromMillisecondsSinceEpoch(tx.timestamp * 1000), shouldWatchForUpdates: false, coinName: coin.name, )); await txTracker.addNotifiedConfirmed(tx.txid); } } } bool _shouldAutoSync = false; @override bool get shouldAutoSync => _shouldAutoSync; @override set shouldAutoSync(bool shouldAutoSync) { if (_shouldAutoSync != shouldAutoSync) { _shouldAutoSync = shouldAutoSync; if (!shouldAutoSync) { timer?.cancel(); timer = null; stopNetworkAlivePinging(); } else { startNetworkAlivePinging(); refresh(); } } } @override bool get isRefreshing => refreshMutex; bool refreshMutex = false; //TODO Show percentages properly/more consistently /// Refreshes display data for the wallet @override Future refresh() async { if (refreshMutex) { Logging.instance.log("$walletId $walletName refreshMutex denied", level: LogLevel.Info); return; } else { refreshMutex = true; } try { GlobalEventBus.instance.fire( WalletSyncStatusChangedEvent( WalletSyncStatus.syncing, walletId, coin, ), ); GlobalEventBus.instance.fire(RefreshPercentChangedEvent(0.0, walletId)); GlobalEventBus.instance.fire(RefreshPercentChangedEvent(0.1, walletId)); final myCode = await getPaymentCode(DerivePathType.bip44); final Set codesToCheck = {}; final nym = await PaynymIsApi().nym(myCode.toString()); if (nym.value != null) { for (final follower in nym.value!.followers) { codesToCheck.add(follower.code); } for (final following in nym.value!.following) { codesToCheck.add(following.code); } } final currentHeight = await chainHeight; const storedHeight = 1; //await storedChainHeight; Logging.instance .log("chain height: $currentHeight", level: LogLevel.Info); // Logging.instance // .log("cached height: $storedHeight", level: LogLevel.Info); if (currentHeight != storedHeight) { GlobalEventBus.instance.fire(RefreshPercentChangedEvent(0.2, walletId)); await _checkChangeAddressForTransactions(); GlobalEventBus.instance.fire(RefreshPercentChangedEvent(0.3, walletId)); await _checkCurrentReceivingAddressesForTransactions(); GlobalEventBus.instance.fire(RefreshPercentChangedEvent(0.4, walletId)); await checkAllCurrentReceivingPaynymAddressesForTransactions(); final fetchFuture = _refreshTransactions(); final utxosRefreshFuture = _updateUTXOs(); GlobalEventBus.instance .fire(RefreshPercentChangedEvent(0.50, walletId)); final feeObj = _getFees(); GlobalEventBus.instance .fire(RefreshPercentChangedEvent(0.60, walletId)); GlobalEventBus.instance .fire(RefreshPercentChangedEvent(0.70, walletId)); _feeObject = Future(() => feeObj); await utxosRefreshFuture; GlobalEventBus.instance .fire(RefreshPercentChangedEvent(0.80, walletId)); await fetchFuture; await checkForNotificationTransactionsTo(codesToCheck); await getAllTxsToWatch(); GlobalEventBus.instance .fire(RefreshPercentChangedEvent(0.90, walletId)); } refreshMutex = false; GlobalEventBus.instance.fire(RefreshPercentChangedEvent(1.0, walletId)); GlobalEventBus.instance.fire( WalletSyncStatusChangedEvent( WalletSyncStatus.synced, walletId, coin, ), ); if (shouldAutoSync) { timer ??= Timer.periodic(const Duration(seconds: 30), (timer) async { Logging.instance.log( "Periodic refresh check for $walletId $walletName in object instance: $hashCode", level: LogLevel.Info); // chain height check currently broken // if ((await chainHeight) != (await storedChainHeight)) { if (await refreshIfThereIsNewData()) { await refresh(); GlobalEventBus.instance.fire(UpdatedInBackgroundEvent( "New data found in $walletId $walletName in background!", walletId)); } // } }); } } catch (error, strace) { refreshMutex = false; GlobalEventBus.instance.fire( NodeConnectionStatusChangedEvent( NodeConnectionStatus.disconnected, walletId, coin, ), ); GlobalEventBus.instance.fire( WalletSyncStatusChangedEvent( WalletSyncStatus.unableToSync, walletId, coin, ), ); Logging.instance.log( "Caught exception in refreshWalletData(): $error\n$strace", level: LogLevel.Error); } } @override Future> prepareSend({ required String address, required int satoshiAmount, Map? args, }) async { try { final feeRateType = args?["feeRate"]; final feeRateAmount = args?["feeRateAmount"]; if (feeRateType is FeeRateType || feeRateAmount is int) { late final int rate; if (feeRateType is FeeRateType) { int fee = 0; final feeObject = await fees; switch (feeRateType) { case FeeRateType.fast: fee = feeObject.fast; break; case FeeRateType.average: fee = feeObject.medium; break; case FeeRateType.slow: fee = feeObject.slow; break; } rate = fee; } else { rate = feeRateAmount as int; } // check for send all bool isSendAll = false; if (satoshiAmount == balance.spendable) { isSendAll = true; } final txData = await coinSelection(satoshiAmount, rate, address, isSendAll); Logging.instance.log("prepare send: $txData", level: LogLevel.Info); try { if (txData is int) { switch (txData) { case 1: throw Exception("Insufficient balance!"); case 2: throw Exception( "Insufficient funds to pay for transaction fee!"); default: throw Exception("Transaction failed with error code $txData"); } } else { final hex = txData["hex"]; if (hex is String) { final fee = txData["fee"] as int; final vSize = txData["vSize"] as int; Logging.instance .log("prepared txHex: $hex", level: LogLevel.Info); Logging.instance.log("prepared fee: $fee", level: LogLevel.Info); Logging.instance .log("prepared vSize: $vSize", level: LogLevel.Info); // fee should never be less than vSize sanity check if (fee < vSize) { throw Exception( "Error in fee calculation: Transaction fee cannot be less than vSize"); } return txData as Map; } else { throw Exception("prepared hex is not a String!!!"); } } } catch (e, s) { Logging.instance.log("Exception rethrown from prepareSend(): $e\n$s", level: LogLevel.Error); rethrow; } } else { throw ArgumentError("Invalid fee rate argument provided!"); } } catch (e, s) { Logging.instance.log("Exception rethrown from prepareSend(): $e\n$s", level: LogLevel.Error); rethrow; } } @override Future confirmSend({required Map txData}) async { try { Logging.instance.log("confirmSend txData: $txData", level: LogLevel.Info); final hex = txData["hex"] as String; final txHash = await _electrumXClient.broadcastTransaction(rawTx: hex); Logging.instance.log("Sent txHash: $txHash", level: LogLevel.Info); return txHash; } catch (e, s) { Logging.instance.log("Exception rethrown from confirmSend(): $e\n$s", level: LogLevel.Error); rethrow; } } @override Future testNetworkConnection() async { try { final result = await _electrumXClient.ping(); return result; } catch (_) { return false; } } Timer? _networkAliveTimer; void startNetworkAlivePinging() { // call once on start right away _periodicPingCheck(); // then periodically check _networkAliveTimer = Timer.periodic( Constants.networkAliveTimerDuration, (_) async { _periodicPingCheck(); }, ); } void _periodicPingCheck() async { bool hasNetwork = await testNetworkConnection(); _isConnected = hasNetwork; if (_isConnected != hasNetwork) { NodeConnectionStatus status = hasNetwork ? NodeConnectionStatus.connected : NodeConnectionStatus.disconnected; GlobalEventBus.instance .fire(NodeConnectionStatusChangedEvent(status, walletId, coin)); } } void stopNetworkAlivePinging() { _networkAliveTimer?.cancel(); _networkAliveTimer = null; } bool _isConnected = false; @override bool get isConnected => _isConnected; @override Future initializeNew() async { Logging.instance .log("Generating new ${coin.prettyName} wallet.", level: LogLevel.Info); if (getCachedId() != null) { throw Exception( "Attempted to initialize a new wallet using an existing wallet ID!"); } await _prefs.init(); try { await _generateNewWallet(); } catch (e, s) { Logging.instance.log("Exception rethrown from initializeNew(): $e\n$s", level: LogLevel.Fatal); rethrow; } await Future.wait([ updateCachedId(walletId), updateCachedIsFavorite(false), ]); } @override Future initializeExisting() async { Logging.instance.log("initializeExisting() ${coin.prettyName} wallet.", level: LogLevel.Info); if (getCachedId() == null) { throw Exception( "Attempted to initialize an existing wallet using an unknown wallet ID!"); } await _prefs.init(); // await _checkCurrentChangeAddressesForTransactions(); // await _checkCurrentReceivingAddressesForTransactions(); } // hack to add tx to txData before refresh completes // required based on current app architecture where we don't properly store // transactions locally in a good way @override Future updateSentCachedTxData(Map txData) async { final transaction = isar_models.Transaction( walletId: walletId, txid: txData["txid"] as String, timestamp: DateTime.now().millisecondsSinceEpoch ~/ 1000, type: isar_models.TransactionType.outgoing, subType: isar_models.TransactionSubType.none, amount: txData["recipientAmt"] as int, fee: txData["fee"] as int, height: null, isCancelled: false, isLelantus: false, otherData: null, slateId: null, inputs: [], outputs: [], ); final address = txData["address"] is String ? await db.getAddress(walletId, txData["address"] as String) : null; await db.addNewTransactionData( [ Tuple2(transaction, address), ], walletId, ); } @override bool validateAddress(String address) { return Address.validateAddress(address, _network); } @override String get walletId => _walletId; late final String _walletId; @override String get walletName => _walletName; late String _walletName; // setter for updating on rename @override set walletName(String newName) => _walletName = newName; late ElectrumX _electrumXClient; ElectrumX get electrumXClient => _electrumXClient; late CachedElectrumX _cachedElectrumXClient; CachedElectrumX get cachedElectrumXClient => _cachedElectrumXClient; late SecureStorageInterface _secureStore; @override Future updateNode(bool shouldRefresh) async { final failovers = NodeService(secureStorageInterface: _secureStore) .failoverNodesFor(coin: coin) .map((e) => ElectrumXNode( address: e.host, port: e.port, name: e.name, id: e.id, useSSL: e.useSSL, )) .toList(); final newNode = await getCurrentNode(); _cachedElectrumXClient = CachedElectrumX.from( node: newNode, prefs: _prefs, failovers: failovers, ); _electrumXClient = ElectrumX.from( node: newNode, prefs: _prefs, failovers: failovers, ); if (shouldRefresh) { unawaited(refresh()); } } Future> _getMnemonicList() async { final _mnemonicString = await mnemonicString; if (_mnemonicString == null) { return []; } final List data = _mnemonicString.split(' '); return data; } Future getCurrentNode() async { final node = NodeService(secureStorageInterface: _secureStore) .getPrimaryNodeFor(coin: coin) ?? DefaultNodes.getNodeFor(coin); return ElectrumXNode( address: node.host, port: node.port, name: node.name, useSSL: node.useSSL, id: node.id, ); } Future> _fetchAllOwnAddresses() async { final allAddresses = await db .getAddresses(walletId) .filter() .not() .typeEqualTo(isar_models.AddressType.nonWallet) .and() .not() .subTypeEqualTo(isar_models.AddressSubType.nonWallet) .findAll(); return allAddresses; } Future _getFees() async { try { //TODO adjust numbers for different speeds? const int f = 1, m = 5, s = 20; final fast = await electrumXClient.estimateFee(blocks: f); final medium = await electrumXClient.estimateFee(blocks: m); final slow = await electrumXClient.estimateFee(blocks: s); final feeObject = FeeObject( numberOfBlocksFast: f, numberOfBlocksAverage: m, numberOfBlocksSlow: s, fast: Format.decimalAmountToSatoshis(fast, coin), medium: Format.decimalAmountToSatoshis(medium, coin), slow: Format.decimalAmountToSatoshis(slow, coin), ); Logging.instance.log("fetched fees: $feeObject", level: LogLevel.Info); return feeObject; } catch (e) { Logging.instance .log("Exception rethrown from _getFees(): $e", level: LogLevel.Error); rethrow; } } Future _generateNewWallet() async { Logging.instance .log("IS_INTEGRATION_TEST: $integrationTestFlag", level: LogLevel.Info); if (!integrationTestFlag) { try { final features = await electrumXClient .getServerFeatures() .timeout(const Duration(seconds: 3)); Logging.instance.log("features: $features", level: LogLevel.Info); switch (coin) { case Coin.bitcoin: if (features['genesis_hash'] != GENESIS_HASH_MAINNET) { throw Exception("genesis hash does not match main net!"); } break; case Coin.bitcoinTestNet: if (features['genesis_hash'] != GENESIS_HASH_TESTNET) { throw Exception("genesis hash does not match test net!"); } break; default: throw Exception( "Attempted to generate a BitcoinWallet using a non bitcoin coin type: ${coin.name}"); } } catch (e, s) { Logging.instance.log("$e/n$s", level: LogLevel.Info); } } // this should never fail if ((await mnemonicString) != null || (await mnemonicPassphrase) != null) { throw Exception( "Attempted to overwrite mnemonic on generate new wallet!"); } await _secureStore.write( key: '${_walletId}_mnemonic', value: bip39.generateMnemonic(strength: 256)); await _secureStore.write(key: '${_walletId}_mnemonicPassphrase', value: ""); // Generate and add addresses to relevant arrays final initialAddresses = await Future.wait([ // P2WPKH _generateAddressForChain(0, 0, DerivePathType.bip84), _generateAddressForChain(1, 0, DerivePathType.bip84), // P2PKH _generateAddressForChain(0, 0, DerivePathType.bip44), _generateAddressForChain(1, 0, DerivePathType.bip44), // P2SH _generateAddressForChain(0, 0, DerivePathType.bip49), _generateAddressForChain(1, 0, DerivePathType.bip49), ]); await db.putAddresses(initialAddresses); Logging.instance.log("_generateNewWalletFinished", level: LogLevel.Info); } /// Generates a new internal or external chain address for the wallet using a BIP84, BIP44, or BIP49 derivation path. /// [chain] - Use 0 for receiving (external), 1 for change (internal). Should not be any other value! /// [index] - This can be any integer >= 0 Future _generateAddressForChain( int chain, int index, DerivePathType derivePathType, ) async { final _mnemonic = await mnemonicString; final _mnemonicPassphrase = await mnemonicPassphrase; if (_mnemonicPassphrase == null) { Logging.instance.log( "Exception in _generateAddressForChain: mnemonic passphrase null, possible migration issue; if using internal builds, delete wallet and restore from seed, if using a release build, please file bug report", level: LogLevel.Error); } final derivePath = constructDerivePath( derivePathType: derivePathType, networkWIF: _network.wif, chain: chain, index: index, ); final node = await Bip32Utils.getBip32Node( _mnemonic!, _mnemonicPassphrase!, _network, derivePath, ); final data = PaymentData(pubkey: node.publicKey); String address; isar_models.AddressType addrType; switch (derivePathType) { case DerivePathType.bip44: address = P2PKH(data: data, network: _network).data.address!; addrType = isar_models.AddressType.p2pkh; break; case DerivePathType.bip49: address = P2SH( data: PaymentData( redeem: P2WPKH(data: data, network: _network).data), network: _network) .data .address!; addrType = isar_models.AddressType.p2sh; break; case DerivePathType.bip84: address = P2WPKH(network: _network, data: data).data.address!; addrType = isar_models.AddressType.p2wpkh; break; default: throw Exception("DerivePathType $derivePathType not supported"); } // add generated address & info to derivations await addDerivation( chain: chain, address: address, pubKey: Format.uint8listToString(node.publicKey), wif: node.toWIF(), derivePathType: derivePathType, ); return isar_models.Address( walletId: walletId, value: address, publicKey: node.publicKey, type: addrType, derivationIndex: index, derivationPath: isar_models.DerivationPath()..value = derivePath, subType: chain == 0 ? isar_models.AddressSubType.receiving : isar_models.AddressSubType.change, ); } /// Returns the latest receiving/change (external/internal) address for the wallet depending on [chain] /// and /// [chain] - Use 0 for receiving (external), 1 for change (internal). Should not be any other value! Future _getCurrentAddressForChain( int chain, DerivePathType derivePathType, ) async { final subType = chain == 0 // Here, we assume that chain == 1 if it isn't 0 ? isar_models.AddressSubType.receiving : isar_models.AddressSubType.change; isar_models.AddressType type; isar_models.Address? address; switch (derivePathType) { case DerivePathType.bip44: type = isar_models.AddressType.p2pkh; break; case DerivePathType.bip49: type = isar_models.AddressType.p2sh; break; case DerivePathType.bip84: type = isar_models.AddressType.p2wpkh; break; default: throw Exception("DerivePathType unsupported"); } address = await db .getAddresses(walletId) .filter() .typeEqualTo(type) .subTypeEqualTo(subType) .sortByDerivationIndexDesc() .findFirst(); return address!.value; } String _buildDerivationStorageKey({ required int chain, required DerivePathType derivePathType, }) { String key; String chainId = chain == 0 ? "receive" : "change"; switch (derivePathType) { case DerivePathType.bip44: key = "${walletId}_${chainId}DerivationsP2PKH"; break; case DerivePathType.bip49: key = "${walletId}_${chainId}DerivationsP2SH"; break; case DerivePathType.bip84: key = "${walletId}_${chainId}DerivationsP2WPKH"; break; default: throw Exception("DerivePathType unsupported"); } return key; } Future> _fetchDerivations({ required int chain, required DerivePathType derivePathType, }) async { // build lookup key final key = _buildDerivationStorageKey( chain: chain, derivePathType: derivePathType); // fetch current derivations final derivationsString = await _secureStore.read(key: key); return Map.from( jsonDecode(derivationsString ?? "{}") as Map); } /// Add a single derivation to the local secure storage for [chain] and /// [derivePathType] where [chain] must either be 1 for change or 0 for receive. /// This will overwrite a previous entry where the address of the new derivation /// matches a derivation currently stored. Future addDerivation({ required int chain, required String address, required String pubKey, required String wif, required DerivePathType derivePathType, }) async { // build lookup key final key = _buildDerivationStorageKey( chain: chain, derivePathType: derivePathType); // fetch current derivations final derivationsString = await _secureStore.read(key: key); final derivations = Map.from(jsonDecode(derivationsString ?? "{}") as Map); // add derivation derivations[address] = { "pubKey": pubKey, "wif": wif, }; // save derivations final newReceiveDerivationsString = jsonEncode(derivations); await _secureStore.write(key: key, value: newReceiveDerivationsString); } /// Add multiple derivations to the local secure storage for [chain] and /// [derivePathType] where [chain] must either be 1 for change or 0 for receive. /// This will overwrite any previous entries where the address of the new derivation /// matches a derivation currently stored. /// The [derivationsToAdd] must be in the format of: /// { /// addressA : { /// "pubKey": , /// "wif": , /// }, /// addressB : { /// "pubKey": , /// "wif": , /// }, /// } Future addDerivations({ required int chain, required DerivePathType derivePathType, required Map derivationsToAdd, }) async { // build lookup key final key = _buildDerivationStorageKey( chain: chain, derivePathType: derivePathType); // fetch current derivations final derivationsString = await _secureStore.read(key: key); final derivations = Map.from(jsonDecode(derivationsString ?? "{}") as Map); // add derivation derivations.addAll(derivationsToAdd); // save derivations final newReceiveDerivationsString = jsonEncode(derivations); await _secureStore.write(key: key, value: newReceiveDerivationsString); } Future>> fastFetch(List allTxHashes) async { List> allTransactions = []; const futureLimit = 30; List>> transactionFutures = []; int currentFutureCount = 0; for (final txHash in allTxHashes) { Future> transactionFuture = cachedElectrumXClient.getTransaction( txHash: txHash, verbose: true, coin: coin, ); transactionFutures.add(transactionFuture); currentFutureCount++; if (currentFutureCount > futureLimit) { currentFutureCount = 0; await Future.wait(transactionFutures); for (final fTx in transactionFutures) { final tx = await fTx; allTransactions.add(tx); } } } if (currentFutureCount != 0) { currentFutureCount = 0; await Future.wait(transactionFutures); for (final fTx in transactionFutures) { final tx = await fTx; allTransactions.add(tx); } } return allTransactions; } Future _updateUTXOs() async { final allAddresses = await _fetchAllOwnAddresses(); try { final fetchedUtxoList = >>[]; final Map>> batches = {}; const batchSizeMax = 100; int batchNumber = 0; for (int i = 0; i < allAddresses.length; i++) { if (batches[batchNumber] == null) { batches[batchNumber] = {}; } final scripthash = AddressUtils.convertToScriptHash(allAddresses[i].value, _network); batches[batchNumber]!.addAll({ scripthash: [scripthash] }); if (i % batchSizeMax == batchSizeMax - 1) { batchNumber++; } } for (int i = 0; i < batches.length; i++) { final response = await _electrumXClient.getBatchUTXOs(args: batches[i]!); for (final entry in response.entries) { if (entry.value.isNotEmpty) { fetchedUtxoList.add(entry.value); } } } final currentChainHeight = await chainHeight; final List outputArray = []; int satoshiBalanceTotal = 0; int satoshiBalancePending = 0; int satoshiBalanceSpendable = 0; int satoshiBalanceBlocked = 0; for (int i = 0; i < fetchedUtxoList.length; i++) { for (int j = 0; j < fetchedUtxoList[i].length; j++) { final txn = await cachedElectrumXClient.getTransaction( txHash: fetchedUtxoList[i][j]["tx_hash"] as String, verbose: true, coin: coin, ); // fetch stored tx to see if paynym notification tx and block utxo final storedTx = await db.getTransaction( walletId, fetchedUtxoList[i][j]["tx_hash"] as String, ); bool shouldBlock = false; String? blockReason; if (storedTx?.subType == isar_models.TransactionSubType.bip47Notification && storedTx?.type == isar_models.TransactionType.incoming) { // probably safe to assume this is an incoming tx as it is a utxo // belonging to this wallet. The extra check may be redundant but // just in case... shouldBlock = true; blockReason = "Incoming paynym notification transaction."; } final utxo = isar_models.UTXO( walletId: walletId, txid: txn["txid"] as String, vout: fetchedUtxoList[i][j]["tx_pos"] as int, value: fetchedUtxoList[i][j]["value"] as int, name: "", isBlocked: shouldBlock, blockedReason: blockReason, isCoinbase: txn["is_coinbase"] as bool? ?? false, blockHash: txn["blockhash"] as String?, blockHeight: fetchedUtxoList[i][j]["height"] as int?, blockTime: txn["blocktime"] as int?, ); satoshiBalanceTotal += utxo.value; if (utxo.isBlocked) { satoshiBalanceBlocked += utxo.value; } else { if (utxo.isConfirmed(currentChainHeight, MINIMUM_CONFIRMATIONS)) { satoshiBalanceSpendable += utxo.value; } else { satoshiBalancePending += utxo.value; } } outputArray.add(utxo); } } Logging.instance .log('Outputs fetched: $outputArray', level: LogLevel.Info); // TODO move this out of here and into IDB await db.isar.writeTxn(() async { await db.isar.utxos.where().walletIdEqualTo(walletId).deleteAll(); await db.isar.utxos.putAll(outputArray); }); // finally update balance _balance = Balance( coin: coin, total: satoshiBalanceTotal, spendable: satoshiBalanceSpendable, blockedTotal: satoshiBalanceBlocked, pendingSpendable: satoshiBalancePending, ); await updateCachedBalance(_balance!); } catch (e, s) { Logging.instance .log("Output fetch unsuccessful: $e\n$s", level: LogLevel.Error); } } @override Balance get balance => _balance ??= getCachedBalance(); Balance? _balance; Future getTxCount({required String address}) async { String? scripthash; try { scripthash = AddressUtils.convertToScriptHash(address, _network); final transactions = await electrumXClient.getHistory(scripthash: scripthash); return transactions.length; } catch (e) { Logging.instance.log( "Exception rethrown in _getTxCount(address: $address, scripthash: $scripthash): $e", level: LogLevel.Error); rethrow; } } Future> _getBatchTxCount({ required Map addresses, }) async { try { final Map> args = {}; for (final entry in addresses.entries) { args[entry.key] = [ AddressUtils.convertToScriptHash(entry.value, _network) ]; } final response = await electrumXClient.getBatchHistory(args: args); final Map result = {}; for (final entry in response.entries) { result[entry.key] = entry.value.length; } return result; } catch (e, s) { Logging.instance.log( "Exception rethrown in _getBatchTxCount(address: $addresses: $e\n$s", level: LogLevel.Error); rethrow; } } Future _checkReceivingAddressForTransactions() async { try { final currentReceiving = await _currentReceivingAddress; final int txCount = await getTxCount(address: currentReceiving.value); Logging.instance.log( 'Number of txs for current receiving address $currentReceiving: $txCount', level: LogLevel.Info); if (txCount >= 1 || currentReceiving.derivationIndex < 0) { // First increment the receiving index final newReceivingIndex = currentReceiving.derivationIndex + 1; // Use new index to derive a new receiving address final newReceivingAddress = await _generateAddressForChain( 0, newReceivingIndex, DerivePathTypeExt.primaryFor(coin)); final existing = await db .getAddresses(walletId) .filter() .valueEqualTo(newReceivingAddress.value) .findFirst(); if (existing == null) { // Add that new change address await db.putAddress(newReceivingAddress); } else { // we need to update the address await db.updateAddress(existing, newReceivingAddress); } // keep checking until address with no tx history is set as current await _checkReceivingAddressForTransactions(); } } catch (e, s) { Logging.instance.log( "Exception rethrown from _checkReceivingAddressForTransactions(${DerivePathTypeExt.primaryFor(coin)}): $e\n$s", level: LogLevel.Error); rethrow; } } Future _checkChangeAddressForTransactions() async { try { final currentChange = await _currentChangeAddress; final int txCount = await getTxCount(address: currentChange.value); Logging.instance.log( 'Number of txs for current change address $currentChange: $txCount', level: LogLevel.Info); if (txCount >= 1 || currentChange.derivationIndex < 0) { // First increment the change index final newChangeIndex = currentChange.derivationIndex + 1; // Use new index to derive a new change address final newChangeAddress = await _generateAddressForChain( 1, newChangeIndex, DerivePathTypeExt.primaryFor(coin)); final existing = await db .getAddresses(walletId) .filter() .valueEqualTo(newChangeAddress.value) .findFirst(); if (existing == null) { // Add that new change address await db.putAddress(newChangeAddress); } else { // we need to update the address await db.updateAddress(existing, newChangeAddress); } // keep checking until address with no tx history is set as current await _checkChangeAddressForTransactions(); } } on SocketException catch (se, s) { Logging.instance.log( "SocketException caught in _checkReceivingAddressForTransactions(${DerivePathTypeExt.primaryFor(coin)}): $se\n$s", level: LogLevel.Error); return; } catch (e, s) { Logging.instance.log( "Exception rethrown from _checkReceivingAddressForTransactions(${DerivePathTypeExt.primaryFor(coin)}): $e\n$s", level: LogLevel.Error); rethrow; } } Future _checkP2PKHChangeAddressForTransactions() async { try { final currentChange = await _currentChangeAddressP2PKH; final int txCount = await getTxCount(address: currentChange.value); Logging.instance.log( 'Number of txs for current change address $currentChange: $txCount', level: LogLevel.Info); if (txCount >= 1 || currentChange.derivationIndex < 0) { // First increment the change index final newChangeIndex = currentChange.derivationIndex + 1; // Use new index to derive a new change address final newChangeAddress = await _generateAddressForChain( 1, newChangeIndex, DerivePathType.bip44); final existing = await db .getAddresses(walletId) .filter() .valueEqualTo(newChangeAddress.value) .findFirst(); if (existing == null) { // Add that new change address await db.putAddress(newChangeAddress); } else { // we need to update the address await db.updateAddress(existing, newChangeAddress); } // keep checking until address with no tx history is set as current await _checkP2PKHChangeAddressForTransactions(); } } on SocketException catch (se, s) { Logging.instance.log( "SocketException caught in _checkReceivingAddressForTransactions(${DerivePathType.bip44}): $se\n$s", level: LogLevel.Error); return; } catch (e, s) { Logging.instance.log( "Exception rethrown from _checkReceivingAddressForTransactions(${DerivePathType.bip44}): $e\n$s", level: LogLevel.Error); rethrow; } } Future _checkCurrentReceivingAddressesForTransactions() async { try { // for (final type in DerivePathType.values) { await _checkReceivingAddressForTransactions(); // } } catch (e, s) { Logging.instance.log( "Exception rethrown from _checkCurrentReceivingAddressesForTransactions(): $e\n$s", level: LogLevel.Error); rethrow; } } /// public wrapper because dart can't test private... Future checkCurrentReceivingAddressesForTransactions() async { if (Platform.environment["FLUTTER_TEST"] == "true") { try { return _checkCurrentReceivingAddressesForTransactions(); } catch (_) { rethrow; } } } Future _checkCurrentChangeAddressesForTransactions() async { try { // for (final type in DerivePathType.values) { await _checkChangeAddressForTransactions(); // } } catch (e, s) { Logging.instance.log( "Exception rethrown from _checkCurrentChangeAddressesForTransactions(): $e\n$s", level: LogLevel.Error); rethrow; } } /// public wrapper because dart can't test private... Future checkCurrentChangeAddressesForTransactions() async { if (Platform.environment["FLUTTER_TEST"] == "true") { try { return _checkCurrentChangeAddressesForTransactions(); } catch (_) { rethrow; } } } Future>> _fetchHistory( List allAddresses) async { try { List> allTxHashes = []; final Map>> batches = {}; final Map requestIdToAddressMap = {}; const batchSizeMax = 100; int batchNumber = 0; for (int i = 0; i < allAddresses.length; i++) { if (batches[batchNumber] == null) { batches[batchNumber] = {}; } final scripthash = AddressUtils.convertToScriptHash(allAddresses[i], _network); final id = Logger.isTestEnv ? "$i" : const Uuid().v1(); requestIdToAddressMap[id] = allAddresses[i]; batches[batchNumber]!.addAll({ id: [scripthash] }); if (i % batchSizeMax == batchSizeMax - 1) { batchNumber++; } } for (int i = 0; i < batches.length; i++) { final response = await _electrumXClient.getBatchHistory(args: batches[i]!); for (final entry in response.entries) { for (int j = 0; j < entry.value.length; j++) { entry.value[j]["address"] = requestIdToAddressMap[entry.key]; if (!allTxHashes.contains(entry.value[j])) { allTxHashes.add(entry.value[j]); } } } } return allTxHashes; } catch (e, s) { Logging.instance.log("_fetchHistory: $e\n$s", level: LogLevel.Error); rethrow; } } bool _duplicateTxCheck( List> allTransactions, String txid) { for (int i = 0; i < allTransactions.length; i++) { if (allTransactions[i]["txid"] == txid) { return true; } } return false; } Future _refreshTransactions() async { final List allAddresses = await _fetchAllOwnAddresses(); final Set> allTxHashes = (await _fetchHistory(allAddresses.map((e) => e.value).toList())) .toSet(); // // prefetch/cache // Set hashes = {}; // for (var element in allReceivingTxHashes) { // hashes.add(element['tx_hash'] as String); // } // await fastFetch(hashes.toList()); List> allTransactions = []; final currentHeight = await chainHeight; for (final txHash in allTxHashes) { final storedTx = await db .getTransactions(walletId) .filter() .txidEqualTo(txHash["tx_hash"] as String) .findFirst(); if (storedTx == null || !storedTx.isConfirmed(currentHeight, MINIMUM_CONFIRMATIONS)) { final tx = await cachedElectrumXClient.getTransaction( txHash: txHash["tx_hash"] as String, verbose: true, coin: coin, ); if (!_duplicateTxCheck(allTransactions, tx["txid"] as String)) { tx["address"] = await db .getAddresses(walletId) .filter() .valueEqualTo(txHash["address"] as String) .findFirst(); tx["height"] = txHash["height"]; allTransactions.add(tx); } } } // // prefetch/cache // Set vHashes = {}; // for (final txObject in allTransactions) { // for (int i = 0; i < (txObject["vin"] as List).length; i++) { // final input = txObject["vin"]![i] as Map; // final prevTxid = input["txid"] as String; // vHashes.add(prevTxid); // } // } // await fastFetch(vHashes.toList()); final List> txnsData = []; for (final txObject in allTransactions) { final data = await parseTransaction( txObject, cachedElectrumXClient, allAddresses, coin, MINIMUM_CONFIRMATIONS, walletId, ); txnsData.add(data); } await db.addNewTransactionData(txnsData, walletId); // quick hack to notify manager to call notifyListeners if // transactions changed if (txnsData.isNotEmpty) { GlobalEventBus.instance.fire( UpdatedInBackgroundEvent( "Transactions updated/added for: $walletId $walletName ", walletId, ), ); } } int estimateTxFee({required int vSize, required int feeRatePerKB}) { return vSize * (feeRatePerKB / 1000).ceil(); } /// The coinselection algorithm decides whether or not the user is eligible to make the transaction /// with [satoshiAmountToSend] and [selectedTxFeeRate]. If so, it will call buildTrasaction() and return /// a map containing the tx hex along with other important information. If not, then it will return /// an integer (1 or 2) dynamic coinSelection( int satoshiAmountToSend, int selectedTxFeeRate, String _recipientAddress, bool isSendAll, { int additionalOutputs = 0, List? utxos, }) async { Logging.instance .log("Starting coinSelection ----------", level: LogLevel.Info); final List availableOutputs = utxos ?? await this.utxos; final currentChainHeight = await chainHeight; final List spendableOutputs = []; int spendableSatoshiValue = 0; // Build list of spendable outputs and totaling their satoshi amount for (var i = 0; i < availableOutputs.length; i++) { if (availableOutputs[i].isBlocked == false && availableOutputs[i] .isConfirmed(currentChainHeight, MINIMUM_CONFIRMATIONS) == true) { spendableOutputs.add(availableOutputs[i]); spendableSatoshiValue += availableOutputs[i].value; } } // sort spendable by age (oldest first) spendableOutputs.sort((a, b) => b.blockTime!.compareTo(a.blockTime!)); Logging.instance.log("spendableOutputs.length: ${spendableOutputs.length}", level: LogLevel.Info); Logging.instance.log("availableOutputs.length: ${availableOutputs.length}", level: LogLevel.Info); Logging.instance .log("spendableOutputs: $spendableOutputs", level: LogLevel.Info); Logging.instance.log("spendableSatoshiValue: $spendableSatoshiValue", level: LogLevel.Info); Logging.instance .log("satoshiAmountToSend: $satoshiAmountToSend", level: LogLevel.Info); // If the amount the user is trying to send is smaller than the amount that they have spendable, // then return 1, which indicates that they have an insufficient balance. if (spendableSatoshiValue < satoshiAmountToSend) { return 1; // If the amount the user wants to send is exactly equal to the amount they can spend, then return // 2, which indicates that they are not leaving enough over to pay the transaction fee } else if (spendableSatoshiValue == satoshiAmountToSend && !isSendAll) { return 2; } // If neither of these statements pass, we assume that the user has a spendable balance greater // than the amount they're attempting to send. Note that this value still does not account for // the added transaction fee, which may require an extra input and will need to be checked for // later on. // Possible situation right here int satoshisBeingUsed = 0; int inputsBeingConsumed = 0; List utxoObjectsToUse = []; for (var i = 0; satoshisBeingUsed < satoshiAmountToSend && i < spendableOutputs.length; i++) { utxoObjectsToUse.add(spendableOutputs[i]); satoshisBeingUsed += spendableOutputs[i].value; inputsBeingConsumed += 1; } for (int i = 0; i < additionalOutputs && inputsBeingConsumed < spendableOutputs.length; i++) { utxoObjectsToUse.add(spendableOutputs[inputsBeingConsumed]); satoshisBeingUsed += spendableOutputs[inputsBeingConsumed].value; inputsBeingConsumed += 1; } Logging.instance .log("satoshisBeingUsed: $satoshisBeingUsed", level: LogLevel.Info); Logging.instance .log("inputsBeingConsumed: $inputsBeingConsumed", level: LogLevel.Info); Logging.instance .log('utxoObjectsToUse: $utxoObjectsToUse', level: LogLevel.Info); // numberOfOutputs' length must always be equal to that of recipientsArray and recipientsAmtArray List recipientsArray = [_recipientAddress]; List recipientsAmtArray = [satoshiAmountToSend]; // gather required signing data final utxoSigningData = await fetchBuildTxData(utxoObjectsToUse); if (isSendAll) { Logging.instance .log("Attempting to send all $coin", level: LogLevel.Info); final int vSizeForOneOutput = (await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: [_recipientAddress], satoshiAmounts: [satoshisBeingUsed - 1], ))["vSize"] as int; int feeForOneOutput = estimateTxFee( vSize: vSizeForOneOutput, feeRatePerKB: selectedTxFeeRate, ); final int roughEstimate = roughFeeEstimate(spendableOutputs.length, 1, selectedTxFeeRate); if (feeForOneOutput < roughEstimate) { feeForOneOutput = roughEstimate; } final int amount = satoshiAmountToSend - feeForOneOutput; dynamic txn = await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: recipientsArray, satoshiAmounts: [amount], ); Map transactionObject = { "hex": txn["hex"], "recipient": recipientsArray[0], "recipientAmt": amount, "fee": feeForOneOutput, "vSize": txn["vSize"], }; return transactionObject; } final int vSizeForOneOutput; try { vSizeForOneOutput = (await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: [_recipientAddress], satoshiAmounts: [satoshisBeingUsed - 1], ))["vSize"] as int; } catch (e) { Logging.instance.log("vSizeForOneOutput: $e", level: LogLevel.Error); rethrow; } final int vSizeForTwoOutPuts; try { vSizeForTwoOutPuts = (await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: [ _recipientAddress, await _getCurrentAddressForChain( 1, DerivePathTypeExt.primaryFor(coin)), ], satoshiAmounts: [ satoshiAmountToSend, max(0, satoshisBeingUsed - satoshiAmountToSend - 1), ], ))["vSize"] as int; } catch (e) { Logging.instance.log("vSizeForTwoOutPuts: $e", level: LogLevel.Error); rethrow; } // Assume 1 output, only for recipient and no change final feeForOneOutput = estimateTxFee( vSize: vSizeForOneOutput, feeRatePerKB: selectedTxFeeRate, ); // Assume 2 outputs, one for recipient and one for change final feeForTwoOutputs = estimateTxFee( vSize: vSizeForTwoOutPuts, feeRatePerKB: selectedTxFeeRate, ); Logging.instance .log("feeForTwoOutputs: $feeForTwoOutputs", level: LogLevel.Info); Logging.instance .log("feeForOneOutput: $feeForOneOutput", level: LogLevel.Info); if (satoshisBeingUsed - satoshiAmountToSend > feeForOneOutput) { if (satoshisBeingUsed - satoshiAmountToSend > feeForOneOutput + DUST_LIMIT) { // Here, we know that theoretically, we may be able to include another output(change) but we first need to // factor in the value of this output in satoshis. int changeOutputSize = satoshisBeingUsed - satoshiAmountToSend - feeForTwoOutputs; // We check to see if the user can pay for the new transaction with 2 outputs instead of one. If they can and // the second output's size > DUST_LIMIT satoshis, we perform the mechanics required to properly generate and use a new // change address. if (changeOutputSize > DUST_LIMIT && satoshisBeingUsed - satoshiAmountToSend - changeOutputSize == feeForTwoOutputs) { // generate new change address if current change address has been used await _checkChangeAddressForTransactions(); final String newChangeAddress = await _getCurrentAddressForChain( 1, DerivePathTypeExt.primaryFor(coin)); int feeBeingPaid = satoshisBeingUsed - satoshiAmountToSend - changeOutputSize; recipientsArray.add(newChangeAddress); recipientsAmtArray.add(changeOutputSize); // At this point, we have the outputs we're going to use, the amounts to send along with which addresses // we intend to send these amounts to. We have enough to send instructions to build the transaction. Logging.instance.log('2 outputs in tx', level: LogLevel.Info); Logging.instance .log('Input size: $satoshisBeingUsed', level: LogLevel.Info); Logging.instance.log('Recipient output size: $satoshiAmountToSend', level: LogLevel.Info); Logging.instance.log('Change Output Size: $changeOutputSize', level: LogLevel.Info); Logging.instance.log( 'Difference (fee being paid): $feeBeingPaid sats', level: LogLevel.Info); Logging.instance .log('Estimated fee: $feeForTwoOutputs', level: LogLevel.Info); dynamic txn = await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: recipientsArray, satoshiAmounts: recipientsAmtArray, ); // make sure minimum fee is accurate if that is being used if (txn["vSize"] - feeBeingPaid == 1) { int changeOutputSize = satoshisBeingUsed - satoshiAmountToSend - (txn["vSize"] as int); feeBeingPaid = satoshisBeingUsed - satoshiAmountToSend - changeOutputSize; recipientsAmtArray.removeLast(); recipientsAmtArray.add(changeOutputSize); Logging.instance.log('Adjusted Input size: $satoshisBeingUsed', level: LogLevel.Info); Logging.instance.log( 'Adjusted Recipient output size: $satoshiAmountToSend', level: LogLevel.Info); Logging.instance.log( 'Adjusted Change Output Size: $changeOutputSize', level: LogLevel.Info); Logging.instance.log( 'Adjusted Difference (fee being paid): $feeBeingPaid sats', level: LogLevel.Info); Logging.instance.log('Adjusted Estimated fee: $feeForTwoOutputs', level: LogLevel.Info); txn = await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: recipientsArray, satoshiAmounts: recipientsAmtArray, ); } Map transactionObject = { "hex": txn["hex"], "recipient": recipientsArray[0], "recipientAmt": recipientsAmtArray[0], "fee": feeBeingPaid, "vSize": txn["vSize"], }; return transactionObject; } else { // Something went wrong here. It either overshot or undershot the estimated fee amount or the changeOutputSize // is smaller than or equal to DUST_LIMIT. Revert to single output transaction. Logging.instance.log('1 output in tx', level: LogLevel.Info); Logging.instance .log('Input size: $satoshisBeingUsed', level: LogLevel.Info); Logging.instance.log('Recipient output size: $satoshiAmountToSend', level: LogLevel.Info); Logging.instance.log( 'Difference (fee being paid): ${satoshisBeingUsed - satoshiAmountToSend} sats', level: LogLevel.Info); Logging.instance .log('Estimated fee: $feeForOneOutput', level: LogLevel.Info); dynamic txn = await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: recipientsArray, satoshiAmounts: recipientsAmtArray, ); Map transactionObject = { "hex": txn["hex"], "recipient": recipientsArray[0], "recipientAmt": recipientsAmtArray[0], "fee": satoshisBeingUsed - satoshiAmountToSend, "vSize": txn["vSize"], }; return transactionObject; } } else { // No additional outputs needed since adding one would mean that it'd be smaller than DUST_LIMIT sats // which makes it uneconomical to add to the transaction. Here, we pass data directly to instruct // the wallet to begin crafting the transaction that the user requested. Logging.instance.log('1 output in tx', level: LogLevel.Info); Logging.instance .log('Input size: $satoshisBeingUsed', level: LogLevel.Info); Logging.instance.log('Recipient output size: $satoshiAmountToSend', level: LogLevel.Info); Logging.instance.log( 'Difference (fee being paid): ${satoshisBeingUsed - satoshiAmountToSend} sats', level: LogLevel.Info); Logging.instance .log('Estimated fee: $feeForOneOutput', level: LogLevel.Info); dynamic txn = await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: recipientsArray, satoshiAmounts: recipientsAmtArray, ); Map transactionObject = { "hex": txn["hex"], "recipient": recipientsArray[0], "recipientAmt": recipientsAmtArray[0], "fee": satoshisBeingUsed - satoshiAmountToSend, "vSize": txn["vSize"], }; return transactionObject; } } else if (satoshisBeingUsed - satoshiAmountToSend == feeForOneOutput) { // In this scenario, no additional change output is needed since inputs - outputs equal exactly // what we need to pay for fees. Here, we pass data directly to instruct the wallet to begin // crafting the transaction that the user requested. Logging.instance.log('1 output in tx', level: LogLevel.Info); Logging.instance .log('Input size: $satoshisBeingUsed', level: LogLevel.Info); Logging.instance.log('Recipient output size: $satoshiAmountToSend', level: LogLevel.Info); Logging.instance.log( 'Fee being paid: ${satoshisBeingUsed - satoshiAmountToSend} sats', level: LogLevel.Info); Logging.instance .log('Estimated fee: $feeForOneOutput', level: LogLevel.Info); dynamic txn = await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: recipientsArray, satoshiAmounts: recipientsAmtArray, ); Map transactionObject = { "hex": txn["hex"], "recipient": recipientsArray[0], "recipientAmt": recipientsAmtArray[0], "fee": feeForOneOutput, "vSize": txn["vSize"], }; return transactionObject; } else { // Remember that returning 2 indicates that the user does not have a sufficient balance to // pay for the transaction fee. Ideally, at this stage, we should check if the user has any // additional outputs they're able to spend and then recalculate fees. Logging.instance.log( 'Cannot pay tx fee - checking for more outputs and trying again', level: LogLevel.Warning); // try adding more outputs if (spendableOutputs.length > inputsBeingConsumed) { return coinSelection(satoshiAmountToSend, selectedTxFeeRate, _recipientAddress, isSendAll, additionalOutputs: additionalOutputs + 1, utxos: utxos); } return 2; } } Future> fetchBuildTxData( List utxosToUse, ) async { // return data Map results = {}; Map> addressTxid = {}; // addresses to check List addressesP2PKH = []; List addressesP2SH = []; List addressesP2WPKH = []; try { // Populating the addresses to check for (var i = 0; i < utxosToUse.length; i++) { final txid = utxosToUse[i].txid; final tx = await _cachedElectrumXClient.getTransaction( txHash: txid, coin: coin, ); for (final output in tx["vout"] as List) { final n = output["n"]; if (n != null && n == utxosToUse[i].vout) { final address = output["scriptPubKey"]["address"] as String; if (!addressTxid.containsKey(address)) { addressTxid[address] = []; } (addressTxid[address] as List).add(txid); switch (addressType(address: address)) { case DerivePathType.bip44: addressesP2PKH.add(address); break; case DerivePathType.bip49: addressesP2SH.add(address); break; case DerivePathType.bip84: addressesP2WPKH.add(address); break; default: throw Exception("DerivePathType unsupported"); } } } } // p2pkh / bip44 final p2pkhLength = addressesP2PKH.length; if (p2pkhLength > 0) { final receiveDerivations = await _fetchDerivations( chain: 0, derivePathType: DerivePathType.bip44, ); final changeDerivations = await _fetchDerivations( chain: 1, derivePathType: DerivePathType.bip44, ); for (int i = 0; i < p2pkhLength; i++) { // receives final receiveDerivation = receiveDerivations[addressesP2PKH[i]]; // if a match exists it will not be null if (receiveDerivation != null) { final data = P2PKH( data: PaymentData( pubkey: Format.stringToUint8List( receiveDerivation["pubKey"] as String)), network: _network, ).data; for (String tx in addressTxid[addressesP2PKH[i]]!) { results[tx] = { "output": data.output, "keyPair": ECPair.fromWIF( receiveDerivation["wif"] as String, network: _network, ), }; } } else { // if its not a receive, check change final changeDerivation = changeDerivations[addressesP2PKH[i]]; // if a match exists it will not be null if (changeDerivation != null) { final data = P2PKH( data: PaymentData( pubkey: Format.stringToUint8List( changeDerivation["pubKey"] as String)), network: _network, ).data; for (String tx in addressTxid[addressesP2PKH[i]]!) { results[tx] = { "output": data.output, "keyPair": ECPair.fromWIF( changeDerivation["wif"] as String, network: _network, ), }; } } } } } // p2sh / bip49 final p2shLength = addressesP2SH.length; if (p2shLength > 0) { final receiveDerivations = await _fetchDerivations( chain: 0, derivePathType: DerivePathType.bip49, ); final changeDerivations = await _fetchDerivations( chain: 1, derivePathType: DerivePathType.bip49, ); for (int i = 0; i < p2shLength; i++) { // receives final receiveDerivation = receiveDerivations[addressesP2SH[i]]; // if a match exists it will not be null if (receiveDerivation != null) { final p2wpkh = P2WPKH( data: PaymentData( pubkey: Format.stringToUint8List( receiveDerivation["pubKey"] as String)), network: _network) .data; final redeemScript = p2wpkh.output; final data = P2SH(data: PaymentData(redeem: p2wpkh), network: _network).data; for (String tx in addressTxid[addressesP2SH[i]]!) { results[tx] = { "output": data.output, "keyPair": ECPair.fromWIF( receiveDerivation["wif"] as String, network: _network, ), "redeemScript": redeemScript, }; } } else { // if its not a receive, check change final changeDerivation = changeDerivations[addressesP2SH[i]]; // if a match exists it will not be null if (changeDerivation != null) { final p2wpkh = P2WPKH( data: PaymentData( pubkey: Format.stringToUint8List( changeDerivation["pubKey"] as String)), network: _network) .data; final redeemScript = p2wpkh.output; final data = P2SH(data: PaymentData(redeem: p2wpkh), network: _network) .data; for (String tx in addressTxid[addressesP2SH[i]]!) { results[tx] = { "output": data.output, "keyPair": ECPair.fromWIF( changeDerivation["wif"] as String, network: _network, ), "redeemScript": redeemScript, }; } } } } } // p2wpkh / bip84 final p2wpkhLength = addressesP2WPKH.length; if (p2wpkhLength > 0) { final receiveDerivations = await _fetchDerivations( chain: 0, derivePathType: DerivePathType.bip84, ); final changeDerivations = await _fetchDerivations( chain: 1, derivePathType: DerivePathType.bip84, ); for (int i = 0; i < p2wpkhLength; i++) { // receives final receiveDerivation = receiveDerivations[addressesP2WPKH[i]]; // if a match exists it will not be null if (receiveDerivation != null) { final data = P2WPKH( data: PaymentData( pubkey: Format.stringToUint8List( receiveDerivation["pubKey"] as String)), network: _network, ).data; for (String tx in addressTxid[addressesP2WPKH[i]]!) { results[tx] = { "output": data.output, "keyPair": ECPair.fromWIF( receiveDerivation["wif"] as String, network: _network, ), }; } } else { // if its not a receive, check change final changeDerivation = changeDerivations[addressesP2WPKH[i]]; // if a match exists it will not be null if (changeDerivation != null) { final data = P2WPKH( data: PaymentData( pubkey: Format.stringToUint8List( changeDerivation["pubKey"] as String)), network: _network, ).data; for (String tx in addressTxid[addressesP2WPKH[i]]!) { results[tx] = { "output": data.output, "keyPair": ECPair.fromWIF( changeDerivation["wif"] as String, network: _network, ), }; } } } } } return results; } catch (e, s) { Logging.instance .log("fetchBuildTxData() threw: $e,\n$s", level: LogLevel.Error); rethrow; } } /// Builds and signs a transaction Future> buildTransaction({ required List utxosToUse, required Map utxoSigningData, required List recipients, required List satoshiAmounts, }) async { Logging.instance .log("Starting buildTransaction ----------", level: LogLevel.Info); final txb = TransactionBuilder(network: _network); txb.setVersion(1); // Add transaction inputs for (var i = 0; i < utxosToUse.length; i++) { final txid = utxosToUse[i].txid; txb.addInput(txid, utxosToUse[i].vout, null, utxoSigningData[txid]["output"] as Uint8List); } // Add transaction output for (var i = 0; i < recipients.length; i++) { txb.addOutput(recipients[i], satoshiAmounts[i]); } try { // Sign the transaction accordingly for (var i = 0; i < utxosToUse.length; i++) { final txid = utxosToUse[i].txid; txb.sign( vin: i, keyPair: utxoSigningData[txid]["keyPair"] as ECPair, witnessValue: utxosToUse[i].value, redeemScript: utxoSigningData[txid]["redeemScript"] as Uint8List?, ); } } catch (e, s) { Logging.instance.log("Caught exception while signing transaction: $e\n$s", level: LogLevel.Error); rethrow; } final builtTx = txb.build(); final vSize = builtTx.virtualSize(); return {"hex": builtTx.toHex(), "vSize": vSize}; } @override Future fullRescan( int maxUnusedAddressGap, int maxNumberOfIndexesToCheck, ) async { Logging.instance.log("Starting full rescan!", level: LogLevel.Info); longMutex = true; GlobalEventBus.instance.fire( WalletSyncStatusChangedEvent( WalletSyncStatus.syncing, walletId, coin, ), ); // clear cache await _cachedElectrumXClient.clearSharedTransactionCache(coin: coin); // back up data // await _rescanBackup(); await db.deleteWalletBlockchainData(walletId); await _deleteDerivations(); try { final _mnemonic = await mnemonicString; final _mnemonicPassphrase = await mnemonicPassphrase; if (_mnemonicPassphrase == null) { Logging.instance.log( "Exception in fullRescan: mnemonic passphrase null, possible migration issue; if using internal builds, delete wallet and restore from seed, if using a release build, please file bug report", level: LogLevel.Error); } await _recoverWalletFromBIP32SeedPhrase( mnemonic: _mnemonic!, mnemonicPassphrase: _mnemonicPassphrase!, maxUnusedAddressGap: maxUnusedAddressGap, maxNumberOfIndexesToCheck: maxNumberOfIndexesToCheck, isRescan: true, ); longMutex = false; await refresh(); Logging.instance.log("Full rescan complete!", level: LogLevel.Info); GlobalEventBus.instance.fire( WalletSyncStatusChangedEvent( WalletSyncStatus.synced, walletId, coin, ), ); } catch (e, s) { GlobalEventBus.instance.fire( WalletSyncStatusChangedEvent( WalletSyncStatus.unableToSync, walletId, coin, ), ); // restore from backup // await _rescanRestore(); longMutex = false; Logging.instance.log("Exception rethrown from fullRescan(): $e\n$s", level: LogLevel.Error); rethrow; } } // Future _rescanRestore() async { // Logging.instance.log("starting rescan restore", level: LogLevel.Info); // // // restore from backup // // P2PKH derivations // final p2pkhReceiveDerivationsString = await _secureStore.read( // key: "${walletId}_receiveDerivationsP2PKH_BACKUP"); // final p2pkhChangeDerivationsString = await _secureStore.read( // key: "${walletId}_changeDerivationsP2PKH_BACKUP"); // // await _secureStore.write( // key: "${walletId}_receiveDerivationsP2PKH", // value: p2pkhReceiveDerivationsString); // await _secureStore.write( // key: "${walletId}_changeDerivationsP2PKH", // value: p2pkhChangeDerivationsString); // // await _secureStore.delete( // key: "${walletId}_receiveDerivationsP2PKH_BACKUP"); // await _secureStore.delete(key: "${walletId}_changeDerivationsP2PKH_BACKUP"); // // // P2SH derivations // final p2shReceiveDerivationsString = await _secureStore.read( // key: "${walletId}_receiveDerivationsP2SH_BACKUP"); // final p2shChangeDerivationsString = await _secureStore.read( // key: "${walletId}_changeDerivationsP2SH_BACKUP"); // // await _secureStore.write( // key: "${walletId}_receiveDerivationsP2SH", // value: p2shReceiveDerivationsString); // await _secureStore.write( // key: "${walletId}_changeDerivationsP2SH", // value: p2shChangeDerivationsString); // // await _secureStore.delete(key: "${walletId}_receiveDerivationsP2SH_BACKUP"); // await _secureStore.delete(key: "${walletId}_changeDerivationsP2SH_BACKUP"); // // // P2WPKH derivations // final p2wpkhReceiveDerivationsString = await _secureStore.read( // key: "${walletId}_receiveDerivationsP2WPKH_BACKUP"); // final p2wpkhChangeDerivationsString = await _secureStore.read( // key: "${walletId}_changeDerivationsP2WPKH_BACKUP"); // // await _secureStore.write( // key: "${walletId}_receiveDerivationsP2WPKH", // value: p2wpkhReceiveDerivationsString); // await _secureStore.write( // key: "${walletId}_changeDerivationsP2WPKH", // value: p2wpkhChangeDerivationsString); // // await _secureStore.delete( // key: "${walletId}_receiveDerivationsP2WPKH_BACKUP"); // await _secureStore.delete( // key: "${walletId}_changeDerivationsP2WPKH_BACKUP"); // // Logging.instance.log("rescan restore complete", level: LogLevel.Info); // } // // Future _rescanBackup() async { // Logging.instance.log("starting rescan backup", level: LogLevel.Info); // // // backup current and clear data // // P2PKH derivations // final p2pkhReceiveDerivationsString = // await _secureStore.read(key: "${walletId}_receiveDerivationsP2PKH"); // final p2pkhChangeDerivationsString = // await _secureStore.read(key: "${walletId}_changeDerivationsP2PKH"); // // await _secureStore.write( // key: "${walletId}_receiveDerivationsP2PKH_BACKUP", // value: p2pkhReceiveDerivationsString); // await _secureStore.write( // key: "${walletId}_changeDerivationsP2PKH_BACKUP", // value: p2pkhChangeDerivationsString); // // await _secureStore.delete(key: "${walletId}_receiveDerivationsP2PKH"); // await _secureStore.delete(key: "${walletId}_changeDerivationsP2PKH"); // // // P2SH derivations // final p2shReceiveDerivationsString = // await _secureStore.read(key: "${walletId}_receiveDerivationsP2SH"); // final p2shChangeDerivationsString = // await _secureStore.read(key: "${walletId}_changeDerivationsP2SH"); // // await _secureStore.write( // key: "${walletId}_receiveDerivationsP2SH_BACKUP", // value: p2shReceiveDerivationsString); // await _secureStore.write( // key: "${walletId}_changeDerivationsP2SH_BACKUP", // value: p2shChangeDerivationsString); // // await _secureStore.delete(key: "${walletId}_receiveDerivationsP2SH"); // await _secureStore.delete(key: "${walletId}_changeDerivationsP2SH"); // // // P2WPKH derivations // final p2wpkhReceiveDerivationsString = // await _secureStore.read(key: "${walletId}_receiveDerivationsP2WPKH"); // final p2wpkhChangeDerivationsString = // await _secureStore.read(key: "${walletId}_changeDerivationsP2WPKH"); // // await _secureStore.write( // key: "${walletId}_receiveDerivationsP2WPKH_BACKUP", // value: p2wpkhReceiveDerivationsString); // await _secureStore.write( // key: "${walletId}_changeDerivationsP2WPKH_BACKUP", // value: p2wpkhChangeDerivationsString); // // await _secureStore.delete(key: "${walletId}_receiveDerivationsP2WPKH"); // await _secureStore.delete(key: "${walletId}_changeDerivationsP2WPKH"); // // // // Logging.instance.log("rescan backup complete", level: LogLevel.Info); // } Future _deleteDerivations() async { // P2PKH derivations await _secureStore.delete(key: "${walletId}_receiveDerivationsP2PKH"); await _secureStore.delete(key: "${walletId}_changeDerivationsP2PKH"); // P2SH derivations await _secureStore.delete(key: "${walletId}_receiveDerivationsP2SH"); await _secureStore.delete(key: "${walletId}_changeDerivationsP2SH"); // P2WPKH derivations await _secureStore.delete(key: "${walletId}_receiveDerivationsP2WPKH"); await _secureStore.delete(key: "${walletId}_changeDerivationsP2WPKH"); } bool isActive = false; @override void Function(bool)? get onIsActiveWalletChanged => (isActive) => this.isActive = isActive; @override Future estimateFeeFor(int satoshiAmount, int feeRate) async { final available = balance.spendable; if (available == satoshiAmount) { return satoshiAmount - (await sweepAllEstimate(feeRate)); } else if (satoshiAmount <= 0 || satoshiAmount > available) { return roughFeeEstimate(1, 2, feeRate); } int runningBalance = 0; int inputCount = 0; for (final output in (await utxos)) { if (!output.isBlocked) { runningBalance += output.value; inputCount++; if (runningBalance > satoshiAmount) { break; } } } final oneOutPutFee = roughFeeEstimate(inputCount, 1, feeRate); final twoOutPutFee = roughFeeEstimate(inputCount, 2, feeRate); if (runningBalance - satoshiAmount > oneOutPutFee) { if (runningBalance - satoshiAmount > oneOutPutFee + DUST_LIMIT) { final change = runningBalance - satoshiAmount - twoOutPutFee; if (change > DUST_LIMIT && runningBalance - satoshiAmount - change == twoOutPutFee) { return runningBalance - satoshiAmount - change; } else { return runningBalance - satoshiAmount; } } else { return runningBalance - satoshiAmount; } } else if (runningBalance - satoshiAmount == oneOutPutFee) { return oneOutPutFee; } else { return twoOutPutFee; } } int roughFeeEstimate(int inputCount, int outputCount, int feeRatePerKB) { return ((42 + (272 * inputCount) + (128 * outputCount)) / 4).ceil() * (feeRatePerKB / 1000).ceil(); } Future sweepAllEstimate(int feeRate) async { int available = 0; int inputCount = 0; for (final output in (await utxos)) { if (!output.isBlocked && output.isConfirmed(storedChainHeight, MINIMUM_CONFIRMATIONS)) { available += output.value; inputCount++; } } // transaction will only have 1 output minus the fee final estimatedFee = roughFeeEstimate(inputCount, 1, feeRate); return available - estimatedFee; } @override Future generateNewAddress() async { try { final currentReceiving = await _currentReceivingAddress; final newReceivingIndex = currentReceiving.derivationIndex + 1; // Use new index to derive a new receiving address final newReceivingAddress = await _generateAddressForChain( 0, newReceivingIndex, DerivePathTypeExt.primaryFor(coin)); // Add that new receiving address await db.putAddress(newReceivingAddress); return true; } catch (e, s) { Logging.instance.log( "Exception rethrown from generateNewAddress(): $e\n$s", level: LogLevel.Error); return false; } } }