mirror of
https://github.com/cypherstack/stack_wallet.git
synced 2024-11-18 18:21:08 +00:00
1474 lines
45 KiB
Dart
1474 lines
45 KiB
Dart
import 'dart:convert';
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import 'dart:math';
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import 'package:bitcoindart/bitcoindart.dart' as btc;
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import 'package:decimal/decimal.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter_libsparkmobile/flutter_libsparkmobile.dart';
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import 'package:isar/isar.dart';
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import 'package:stackwallet/models/balance.dart';
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import 'package:stackwallet/models/isar/models/isar_models.dart';
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import 'package:stackwallet/models/signing_data.dart';
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import 'package:stackwallet/utilities/amount/amount.dart';
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import 'package:stackwallet/utilities/extensions/extensions.dart';
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import 'package:stackwallet/utilities/logger.dart';
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import 'package:stackwallet/wallets/crypto_currency/crypto_currency.dart';
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import 'package:stackwallet/wallets/isar/models/spark_coin.dart';
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import 'package:stackwallet/wallets/models/tx_data.dart';
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import 'package:stackwallet/wallets/wallet/intermediate/bip39_hd_wallet.dart';
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import 'package:stackwallet/wallets/wallet/wallet_mixin_interfaces/electrumx_interface.dart';
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const kDefaultSparkIndex = 1;
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// TODO dart style constants. Maybe move to spark lib?
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const MAX_STANDARD_TX_WEIGHT = 400000;
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//https://github.com/firoorg/sparkmobile/blob/ef2e39aae18ecc49e0ddc63a3183e9764b96012e/include/spark.h#L16
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const SPARK_OUT_LIMIT_PER_TX = 16;
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const OP_SPARKMINT = 0xd1;
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const OP_SPARKSMINT = 0xd2;
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const OP_SPARKSPEND = 0xd3;
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mixin SparkInterface on Bip39HDWallet, ElectrumXInterface {
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String? _sparkChangeAddressCached;
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/// Spark change address. Should generally not be exposed to end users.
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String get sparkChangeAddress {
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if (_sparkChangeAddressCached == null) {
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throw Exception("_sparkChangeAddressCached was not initialized");
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}
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return _sparkChangeAddressCached!;
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}
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static bool validateSparkAddress({
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required String address,
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required bool isTestNet,
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}) =>
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LibSpark.validateAddress(address: address, isTestNet: isTestNet);
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@override
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Future<void> init() async {
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Address? address = await getCurrentReceivingSparkAddress();
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if (address == null) {
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address = await generateNextSparkAddress();
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await mainDB.putAddress(address);
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} // TODO add other address types to wallet info?
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if (_sparkChangeAddressCached == null) {
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final root = await getRootHDNode();
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final String derivationPath;
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if (cryptoCurrency.network == CryptoCurrencyNetwork.test) {
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derivationPath = "$kSparkBaseDerivationPathTestnet$kDefaultSparkIndex";
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} else {
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derivationPath = "$kSparkBaseDerivationPath$kDefaultSparkIndex";
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}
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final keys = root.derivePath(derivationPath);
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_sparkChangeAddressCached = await LibSpark.getAddress(
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privateKey: keys.privateKey.data,
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index: kDefaultSparkIndex,
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diversifier: kSparkChange,
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isTestNet: cryptoCurrency.network == CryptoCurrencyNetwork.test,
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);
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}
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// await info.updateReceivingAddress(
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// newAddress: address.value,
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// isar: mainDB.isar,
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// );
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await super.init();
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}
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@override
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Future<List<Address>> fetchAddressesForElectrumXScan() async {
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final allAddresses = await mainDB
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.getAddresses(walletId)
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.filter()
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.not()
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.group(
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(q) => q
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.typeEqualTo(AddressType.spark)
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.or()
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.typeEqualTo(AddressType.nonWallet)
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.or()
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.subTypeEqualTo(AddressSubType.nonWallet),
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)
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.findAll();
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return allAddresses;
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}
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Future<Address?> getCurrentReceivingSparkAddress() async {
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return await mainDB.isar.addresses
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.where()
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.walletIdEqualTo(walletId)
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.filter()
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.typeEqualTo(AddressType.spark)
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.sortByDerivationIndexDesc()
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.findFirst();
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}
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Future<Address> generateNextSparkAddress() async {
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final highestStoredDiversifier =
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(await getCurrentReceivingSparkAddress())?.derivationIndex;
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// default to starting at 1 if none found
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int diversifier = (highestStoredDiversifier ?? 0) + 1;
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// change address check
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if (diversifier == kSparkChange) {
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diversifier++;
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}
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final root = await getRootHDNode();
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final String derivationPath;
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if (cryptoCurrency.network == CryptoCurrencyNetwork.test) {
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derivationPath = "$kSparkBaseDerivationPathTestnet$kDefaultSparkIndex";
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} else {
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derivationPath = "$kSparkBaseDerivationPath$kDefaultSparkIndex";
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}
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final keys = root.derivePath(derivationPath);
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final String addressString = await LibSpark.getAddress(
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privateKey: keys.privateKey.data,
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index: kDefaultSparkIndex,
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diversifier: diversifier,
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isTestNet: cryptoCurrency.network == CryptoCurrencyNetwork.test,
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);
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return Address(
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walletId: walletId,
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value: addressString,
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publicKey: keys.publicKey.data,
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derivationIndex: diversifier,
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derivationPath: DerivationPath()..value = derivationPath,
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type: AddressType.spark,
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subType: AddressSubType.receiving,
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);
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}
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Future<Amount> estimateFeeForSpark(Amount amount) async {
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// int spendAmount = amount.raw.toInt();
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// if (spendAmount == 0) {
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return Amount(
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rawValue: BigInt.from(0),
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fractionDigits: cryptoCurrency.fractionDigits,
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);
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// }
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// TODO actual fee estimation
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}
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/// Spark to Spark/Transparent (spend) creation
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Future<TxData> prepareSendSpark({
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required TxData txData,
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}) async {
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// There should be at least one output.
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if (!(txData.recipients?.isNotEmpty == true ||
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txData.sparkRecipients?.isNotEmpty == true)) {
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throw Exception("No recipients provided.");
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}
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if (txData.sparkRecipients?.isNotEmpty == true &&
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txData.sparkRecipients!.length >= SPARK_OUT_LIMIT_PER_TX - 1) {
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throw Exception("Spark shielded output limit exceeded.");
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}
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final transparentSumOut =
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(txData.recipients ?? []).map((e) => e.amount).fold(
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Amount(
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rawValue: BigInt.zero,
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fractionDigits: cryptoCurrency.fractionDigits,
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),
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(p, e) => p + e);
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// See SPARK_VALUE_SPEND_LIMIT_PER_TRANSACTION at https://github.com/firoorg/sparkmobile/blob/ef2e39aae18ecc49e0ddc63a3183e9764b96012e/include/spark.h#L17
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// and COIN https://github.com/firoorg/sparkmobile/blob/ef2e39aae18ecc49e0ddc63a3183e9764b96012e/bitcoin/amount.h#L17
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// Note that as MAX_MONEY is greater than this limit, we can ignore it. See https://github.com/firoorg/sparkmobile/blob/ef2e39aae18ecc49e0ddc63a3183e9764b96012e/bitcoin/amount.h#L31
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if (transparentSumOut >
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Amount.fromDecimal(
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Decimal.parse("10000"),
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fractionDigits: cryptoCurrency.fractionDigits,
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)) {
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throw Exception(
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"Spend to transparent address limit exceeded (10,000 Firo per transaction).");
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}
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final sparkSumOut =
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(txData.sparkRecipients ?? []).map((e) => e.amount).fold(
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Amount(
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rawValue: BigInt.zero,
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fractionDigits: cryptoCurrency.fractionDigits,
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),
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(p, e) => p + e);
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final txAmount = transparentSumOut + sparkSumOut;
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// fetch spendable spark coins
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final coins = await mainDB.isar.sparkCoins
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.where()
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.walletIdEqualToAnyLTagHash(walletId)
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.filter()
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.isUsedEqualTo(false)
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.and()
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.heightIsNotNull()
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.and()
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.not()
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.valueIntStringEqualTo("0")
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.findAll();
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final available = info.cachedBalanceTertiary.spendable;
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if (txAmount > available) {
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throw Exception("Insufficient Spark balance");
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}
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final bool isSendAll = available == txAmount;
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// prepare coin data for ffi
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final serializedCoins = coins
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.map((e) => (
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serializedCoin: e.serializedCoinB64!,
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serializedCoinContext: e.contextB64!,
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groupId: e.groupId,
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height: e.height!,
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))
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.toList();
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final currentId = await electrumXClient.getSparkLatestCoinId();
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final List<Map<String, dynamic>> setMaps = [];
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final List<({int groupId, String blockHash})> idAndBlockHashes = [];
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for (int i = 1; i <= currentId; i++) {
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final set = await electrumXCachedClient.getSparkAnonymitySet(
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groupId: i.toString(),
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coin: info.coin,
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);
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set["coinGroupID"] = i;
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setMaps.add(set);
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idAndBlockHashes.add(
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(
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groupId: i,
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blockHash: set["blockHash"] as String,
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),
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);
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}
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final allAnonymitySets = setMaps
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.map((e) => (
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setId: e["coinGroupID"] as int,
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setHash: e["setHash"] as String,
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set: (e["coins"] as List)
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.map((e) => (
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serializedCoin: e[0] as String,
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txHash: e[1] as String,
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))
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.toList(),
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))
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.toList();
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final root = await getRootHDNode();
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final String derivationPath;
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if (cryptoCurrency.network == CryptoCurrencyNetwork.test) {
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derivationPath = "$kSparkBaseDerivationPathTestnet$kDefaultSparkIndex";
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} else {
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derivationPath = "$kSparkBaseDerivationPath$kDefaultSparkIndex";
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}
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final privateKey = root.derivePath(derivationPath).privateKey.data;
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final txb = btc.TransactionBuilder(
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network: _bitcoinDartNetwork,
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);
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txb.setLockTime(await chainHeight);
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txb.setVersion(3 | (9 << 16));
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List<({String address, Amount amount})>? recipientsWithFeeSubtracted;
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List<
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({
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String address,
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Amount amount,
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String memo,
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})>? sparkRecipientsWithFeeSubtracted;
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final recipientCount = (txData.recipients
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?.where(
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(e) => e.amount.raw > BigInt.zero,
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)
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.length ??
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0);
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final totalRecipientCount =
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recipientCount + (txData.sparkRecipients?.length ?? 0);
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final BigInt estimatedFee;
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if (isSendAll) {
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final estFee = LibSpark.estimateSparkFee(
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privateKeyHex: privateKey.toHex,
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index: kDefaultSparkIndex,
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sendAmount: txAmount.raw.toInt(),
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subtractFeeFromAmount: true,
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serializedCoins: serializedCoins,
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privateRecipientsCount: (txData.sparkRecipients?.length ?? 0),
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);
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estimatedFee = BigInt.from(estFee);
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} else {
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estimatedFee = BigInt.zero;
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}
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if ((txData.sparkRecipients?.length ?? 0) > 0) {
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sparkRecipientsWithFeeSubtracted = [];
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}
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if (recipientCount > 0) {
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recipientsWithFeeSubtracted = [];
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}
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for (int i = 0; i < (txData.sparkRecipients?.length ?? 0); i++) {
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sparkRecipientsWithFeeSubtracted!.add(
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(
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address: txData.sparkRecipients![i].address,
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amount: Amount(
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rawValue: txData.sparkRecipients![i].amount.raw -
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(estimatedFee ~/ BigInt.from(totalRecipientCount)),
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fractionDigits: cryptoCurrency.fractionDigits,
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),
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memo: txData.sparkRecipients![i].memo,
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),
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);
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}
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for (int i = 0; i < (txData.recipients?.length ?? 0); i++) {
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if (txData.recipients![i].amount.raw == BigInt.zero) {
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continue;
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}
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recipientsWithFeeSubtracted!.add(
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(
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address: txData.recipients![i].address,
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amount: Amount(
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rawValue: txData.recipients![i].amount.raw -
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(estimatedFee ~/ BigInt.from(totalRecipientCount)),
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fractionDigits: cryptoCurrency.fractionDigits,
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),
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),
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);
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final scriptPubKey = btc.Address.addressToOutputScript(
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txData.recipients![i].address,
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_bitcoinDartNetwork,
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);
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txb.addOutput(
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scriptPubKey,
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recipientsWithFeeSubtracted[i].amount.raw.toInt(),
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);
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}
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final extractedTx = txb.buildIncomplete();
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extractedTx.addInput(
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'0000000000000000000000000000000000000000000000000000000000000000'
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.toUint8ListFromHex,
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0xffffffff,
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0xffffffff,
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"d3".toUint8ListFromHex, // OP_SPARKSPEND
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);
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extractedTx.setPayload(Uint8List(0));
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final spend = await compute(
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_createSparkSend,
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(
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privateKeyHex: privateKey.toHex,
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index: kDefaultSparkIndex,
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recipients: txData.recipients
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?.map((e) => (
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address: e.address,
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amount: e.amount.raw.toInt(),
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subtractFeeFromAmount: isSendAll,
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))
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.toList() ??
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[],
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privateRecipients: txData.sparkRecipients
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?.map((e) => (
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sparkAddress: e.address,
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amount: e.amount.raw.toInt(),
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subtractFeeFromAmount: isSendAll,
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memo: e.memo,
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))
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.toList() ??
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[],
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serializedCoins: serializedCoins,
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allAnonymitySets: allAnonymitySets,
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idAndBlockHashes: idAndBlockHashes
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.map(
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(e) => (setId: e.groupId, blockHash: base64Decode(e.blockHash)))
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.toList(),
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txHash: extractedTx.getHash(),
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),
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);
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for (final outputScript in spend.outputScripts) {
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extractedTx.addOutput(outputScript, 0);
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}
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extractedTx.setPayload(spend.serializedSpendPayload);
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final rawTxHex = extractedTx.toHex();
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if (isSendAll) {
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txData = txData.copyWith(
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recipients: recipientsWithFeeSubtracted,
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sparkRecipients: sparkRecipientsWithFeeSubtracted,
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);
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}
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return txData.copyWith(
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raw: rawTxHex,
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vSize: extractedTx.virtualSize(),
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fee: Amount(
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rawValue: BigInt.from(spend.fee),
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fractionDigits: cryptoCurrency.fractionDigits,
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),
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// TODO used coins
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);
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}
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// this may not be needed for either mints or spends or both
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Future<TxData> confirmSendSpark({
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required TxData txData,
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}) async {
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try {
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Logging.instance.log("confirmSend txData: $txData", level: LogLevel.Info);
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final txHash = await electrumXClient.broadcastTransaction(
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rawTx: txData.raw!,
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);
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Logging.instance.log("Sent txHash: $txHash", level: LogLevel.Info);
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txData = txData.copyWith(
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// TODO mark spark coins as spent locally and update balance before waiting to check via electrumx?
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// usedUTXOs:
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// txData.usedUTXOs!.map((e) => e.copyWith(used: true)).toList(),
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// TODO revisit setting these both
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txHash: txHash,
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txid: txHash,
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);
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// // mark utxos as used
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// await mainDB.putUTXOs(txData.usedUTXOs!);
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return txData;
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} catch (e, s) {
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Logging.instance.log("Exception rethrown from confirmSend(): $e\n$s",
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level: LogLevel.Error);
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rethrow;
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}
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}
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// TODO lots of room for performance improvements here. Should be similar to
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// recoverSparkWallet but only fetch and check anonymity set data that we
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// have not yet parsed.
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Future<void> refreshSparkData() async {
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final sparkAddresses = await mainDB.isar.addresses
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.where()
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.walletIdEqualTo(walletId)
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.filter()
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.typeEqualTo(AddressType.spark)
|
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.findAll();
|
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final Set<String> paths =
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sparkAddresses.map((e) => e.derivationPath!.value).toSet();
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|
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try {
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final latestSparkCoinId = await electrumXClient.getSparkLatestCoinId();
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final blockHash = await _getCachedSparkBlockHash();
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final anonymitySetFuture = blockHash == null
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? electrumXCachedClient.getSparkAnonymitySet(
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groupId: latestSparkCoinId.toString(),
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coin: info.coin,
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)
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: electrumXClient.getSparkAnonymitySet(
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coinGroupId: latestSparkCoinId.toString(),
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startBlockHash: blockHash,
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);
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final spentCoinTagsFuture =
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electrumXClient.getSparkUsedCoinsTags(startNumber: 0);
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// electrumXCachedClient.getSparkUsedCoinsTags(coin: info.coin);
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final futureResults = await Future.wait([
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anonymitySetFuture,
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spentCoinTagsFuture,
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]);
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final anonymitySet = futureResults[0] as Map<String, dynamic>;
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final spentCoinTags = futureResults[1] as Set<String>;
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final List<SparkCoin> myCoins = [];
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|
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if (anonymitySet["coins"] is List &&
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(anonymitySet["coins"] as List).isNotEmpty) {
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final root = await getRootHDNode();
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final privateKeyHexSet = paths
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.map(
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(e) => root.derivePath(e).privateKey.data.toHex,
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)
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.toSet();
|
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|
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final identifiedCoins = await compute(
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_identifyCoins,
|
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(
|
|
anonymitySetCoins: anonymitySet["coins"] as List,
|
|
groupId: latestSparkCoinId,
|
|
spentCoinTags: spentCoinTags,
|
|
privateKeyHexSet: privateKeyHexSet,
|
|
walletId: walletId,
|
|
isTestNet: cryptoCurrency.network == CryptoCurrencyNetwork.test,
|
|
),
|
|
);
|
|
|
|
myCoins.addAll(identifiedCoins);
|
|
|
|
// update blockHash in cache
|
|
final String newBlockHash =
|
|
base64ToReverseHex(anonymitySet["blockHash"] as String);
|
|
await _setCachedSparkBlockHash(newBlockHash);
|
|
}
|
|
|
|
// check current coins
|
|
final currentCoins = await mainDB.isar.sparkCoins
|
|
.where()
|
|
.walletIdEqualToAnyLTagHash(walletId)
|
|
.filter()
|
|
.isUsedEqualTo(false)
|
|
.findAll();
|
|
for (final coin in currentCoins) {
|
|
if (spentCoinTags.contains(coin.lTagHash)) {
|
|
myCoins.add(coin.copyWith(isUsed: true));
|
|
}
|
|
}
|
|
|
|
// update wallet spark coins in isar
|
|
await _addOrUpdateSparkCoins(myCoins);
|
|
|
|
// refresh spark balance
|
|
await refreshSparkBalance();
|
|
} catch (e, s) {
|
|
// todo logging
|
|
|
|
rethrow;
|
|
}
|
|
}
|
|
|
|
Future<void> refreshSparkBalance() async {
|
|
final currentHeight = await chainHeight;
|
|
final unusedCoins = await mainDB.isar.sparkCoins
|
|
.where()
|
|
.walletIdEqualToAnyLTagHash(walletId)
|
|
.filter()
|
|
.isUsedEqualTo(false)
|
|
.findAll();
|
|
|
|
final total = Amount(
|
|
rawValue: unusedCoins
|
|
.map((e) => e.value)
|
|
.fold(BigInt.zero, (prev, e) => prev + e),
|
|
fractionDigits: cryptoCurrency.fractionDigits,
|
|
);
|
|
final spendable = Amount(
|
|
rawValue: unusedCoins
|
|
.where((e) =>
|
|
e.height != null &&
|
|
e.height! + cryptoCurrency.minConfirms <= currentHeight)
|
|
.map((e) => e.value)
|
|
.fold(BigInt.zero, (prev, e) => prev + e),
|
|
fractionDigits: cryptoCurrency.fractionDigits,
|
|
);
|
|
|
|
final sparkBalance = Balance(
|
|
total: total,
|
|
spendable: spendable,
|
|
blockedTotal: Amount(
|
|
rawValue: BigInt.zero,
|
|
fractionDigits: cryptoCurrency.fractionDigits,
|
|
),
|
|
pendingSpendable: total - spendable,
|
|
);
|
|
|
|
await info.updateBalanceTertiary(
|
|
newBalance: sparkBalance,
|
|
isar: mainDB.isar,
|
|
);
|
|
}
|
|
|
|
/// Should only be called within the standard wallet [recover] function due to
|
|
/// mutex locking. Otherwise behaviour MAY be undefined.
|
|
Future<void> recoverSparkWallet({
|
|
required Map<dynamic, dynamic> anonymitySet,
|
|
required Set<String> spentCoinTags,
|
|
}) async {
|
|
// generate spark addresses if non existing
|
|
if (await getCurrentReceivingSparkAddress() == null) {
|
|
final address = await generateNextSparkAddress();
|
|
await mainDB.putAddress(address);
|
|
}
|
|
|
|
final sparkAddresses = await mainDB.isar.addresses
|
|
.where()
|
|
.walletIdEqualTo(walletId)
|
|
.filter()
|
|
.typeEqualTo(AddressType.spark)
|
|
.findAll();
|
|
|
|
final Set<String> paths =
|
|
sparkAddresses.map((e) => e.derivationPath!.value).toSet();
|
|
|
|
try {
|
|
final root = await getRootHDNode();
|
|
final privateKeyHexSet =
|
|
paths.map((e) => root.derivePath(e).privateKey.data.toHex).toSet();
|
|
|
|
final myCoins = await compute(
|
|
_identifyCoins,
|
|
(
|
|
anonymitySetCoins: anonymitySet["coins"] as List,
|
|
groupId: anonymitySet["coinGroupID"] as int,
|
|
spentCoinTags: spentCoinTags,
|
|
privateKeyHexSet: privateKeyHexSet,
|
|
walletId: walletId,
|
|
isTestNet: cryptoCurrency.network == CryptoCurrencyNetwork.test,
|
|
),
|
|
);
|
|
|
|
// update wallet spark coins in isar
|
|
await _addOrUpdateSparkCoins(myCoins);
|
|
|
|
// update blockHash in cache
|
|
final String newBlockHash = anonymitySet["blockHash"] as String;
|
|
await _setCachedSparkBlockHash(newBlockHash);
|
|
|
|
// refresh spark balance
|
|
await refreshSparkBalance();
|
|
} catch (e, s) {
|
|
// todo logging
|
|
|
|
rethrow;
|
|
}
|
|
}
|
|
|
|
// modelled on CSparkWallet::CreateSparkMintTransactions https://github.com/firoorg/firo/blob/39c41e5e7ec634ced3700fe3f4f5509dc2e480d0/src/spark/sparkwallet.cpp#L752
|
|
Future<List<TxData>> _createSparkMintTransactions({
|
|
required List<UTXO> availableUtxos,
|
|
required List<MutableSparkRecipient> outputs,
|
|
required bool subtractFeeFromAmount,
|
|
required bool autoMintAll,
|
|
}) async {
|
|
// pre checks
|
|
if (outputs.isEmpty) {
|
|
throw Exception("Cannot mint without some recipients");
|
|
}
|
|
|
|
// TODO remove when multiple recipients gui is added. Will need to handle
|
|
// addresses when confirming the transactions later as well
|
|
assert(outputs.length == 1);
|
|
|
|
BigInt valueToMint =
|
|
outputs.map((e) => e.value).reduce((value, element) => value + element);
|
|
|
|
if (valueToMint <= BigInt.zero) {
|
|
throw Exception("Cannot mint amount=$valueToMint");
|
|
}
|
|
final totalUtxosValue = _sum(availableUtxos);
|
|
if (valueToMint > totalUtxosValue) {
|
|
throw Exception("Insufficient balance to create spark mint(s)");
|
|
}
|
|
|
|
// organise utxos
|
|
Map<String, List<UTXO>> utxosByAddress = {};
|
|
for (final utxo in availableUtxos) {
|
|
utxosByAddress[utxo.address!] ??= [];
|
|
utxosByAddress[utxo.address!]!.add(utxo);
|
|
}
|
|
final valueAndUTXOs = utxosByAddress.values.toList();
|
|
|
|
// setup some vars
|
|
int nChangePosInOut = -1;
|
|
int nChangePosRequest = nChangePosInOut;
|
|
List<MutableSparkRecipient> outputs_ = outputs
|
|
.map((e) => MutableSparkRecipient(e.address, e.value, e.memo))
|
|
.toList(); // deep copy
|
|
final feesObject = await fees;
|
|
final currentHeight = await chainHeight;
|
|
final random = Random.secure();
|
|
final List<TxData> results = [];
|
|
|
|
valueAndUTXOs.shuffle(random);
|
|
|
|
while (valueAndUTXOs.isNotEmpty) {
|
|
final lockTime = random.nextInt(10) == 0
|
|
? max(0, currentHeight - random.nextInt(100))
|
|
: currentHeight;
|
|
const txVersion = 1;
|
|
final List<SigningData> vin = [];
|
|
final List<(dynamic, int)> vout = [];
|
|
|
|
BigInt nFeeRet = BigInt.zero;
|
|
|
|
final itr = valueAndUTXOs.first;
|
|
BigInt valueToMintInTx = _sum(itr);
|
|
|
|
if (!autoMintAll) {
|
|
valueToMintInTx = _min(valueToMintInTx, valueToMint);
|
|
}
|
|
|
|
BigInt nValueToSelect, mintedValue;
|
|
final List<SigningData> setCoins = [];
|
|
bool skipCoin = false;
|
|
|
|
// Start with no fee and loop until there is enough fee
|
|
while (true) {
|
|
mintedValue = valueToMintInTx;
|
|
|
|
if (subtractFeeFromAmount) {
|
|
nValueToSelect = mintedValue;
|
|
} else {
|
|
nValueToSelect = mintedValue + nFeeRet;
|
|
}
|
|
|
|
// if not enough coins in this group then subtract fee from mint
|
|
if (nValueToSelect > _sum(itr) && !subtractFeeFromAmount) {
|
|
nValueToSelect = mintedValue;
|
|
mintedValue -= nFeeRet;
|
|
}
|
|
|
|
// if (!MoneyRange(mintedValue) || mintedValue == 0) {
|
|
if (mintedValue == BigInt.zero) {
|
|
valueAndUTXOs.remove(itr);
|
|
skipCoin = true;
|
|
break;
|
|
}
|
|
|
|
nChangePosInOut = nChangePosRequest;
|
|
vin.clear();
|
|
vout.clear();
|
|
setCoins.clear();
|
|
|
|
// deep copy
|
|
final remainingOutputs = outputs_
|
|
.map((e) => MutableSparkRecipient(e.address, e.value, e.memo))
|
|
.toList();
|
|
final List<MutableSparkRecipient> singleTxOutputs = [];
|
|
|
|
if (autoMintAll) {
|
|
singleTxOutputs.add(
|
|
MutableSparkRecipient(
|
|
(await getCurrentReceivingSparkAddress())!.value,
|
|
mintedValue,
|
|
"",
|
|
),
|
|
);
|
|
} else {
|
|
BigInt remainingMintValue = BigInt.parse(mintedValue.toString());
|
|
|
|
while (remainingMintValue > BigInt.zero) {
|
|
final singleMintValue =
|
|
_min(remainingMintValue, remainingOutputs.first.value);
|
|
singleTxOutputs.add(
|
|
MutableSparkRecipient(
|
|
remainingOutputs.first.address,
|
|
singleMintValue,
|
|
remainingOutputs.first.memo,
|
|
),
|
|
);
|
|
|
|
// subtract minted amount from remaining value
|
|
remainingMintValue -= singleMintValue;
|
|
remainingOutputs.first.value -= singleMintValue;
|
|
|
|
if (remainingOutputs.first.value == BigInt.zero) {
|
|
remainingOutputs.remove(remainingOutputs.first);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (subtractFeeFromAmount) {
|
|
final BigInt singleFee =
|
|
nFeeRet ~/ BigInt.from(singleTxOutputs.length);
|
|
BigInt remainder = nFeeRet % BigInt.from(singleTxOutputs.length);
|
|
|
|
for (int i = 0; i < singleTxOutputs.length; ++i) {
|
|
if (singleTxOutputs[i].value <= singleFee) {
|
|
singleTxOutputs.removeAt(i);
|
|
remainder += singleTxOutputs[i].value - singleFee;
|
|
--i;
|
|
}
|
|
singleTxOutputs[i].value -= singleFee;
|
|
if (remainder > BigInt.zero &&
|
|
singleTxOutputs[i].value >
|
|
nFeeRet % BigInt.from(singleTxOutputs.length)) {
|
|
// first receiver pays the remainder not divisible by output count
|
|
singleTxOutputs[i].value -= remainder;
|
|
remainder = BigInt.zero;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Generate dummy mint coins to save time
|
|
final dummyRecipients = LibSpark.createSparkMintRecipients(
|
|
outputs: singleTxOutputs
|
|
.map((e) => (
|
|
sparkAddress: e.address,
|
|
value: e.value.toInt(),
|
|
memo: "",
|
|
))
|
|
.toList(),
|
|
serialContext: Uint8List(0),
|
|
generate: false,
|
|
);
|
|
|
|
final dummyTxb = btc.TransactionBuilder(network: _bitcoinDartNetwork);
|
|
dummyTxb.setVersion(txVersion);
|
|
dummyTxb.setLockTime(lockTime);
|
|
for (final recipient in dummyRecipients) {
|
|
if (recipient.amount < cryptoCurrency.dustLimit.raw.toInt()) {
|
|
throw Exception("Output amount too small");
|
|
}
|
|
vout.add((
|
|
recipient.scriptPubKey,
|
|
recipient.amount,
|
|
));
|
|
}
|
|
|
|
// Choose coins to use
|
|
BigInt nValueIn = BigInt.zero;
|
|
for (final utxo in itr) {
|
|
if (nValueToSelect > nValueIn) {
|
|
setCoins.add((await fetchBuildTxData([utxo])).first);
|
|
nValueIn += BigInt.from(utxo.value);
|
|
}
|
|
}
|
|
if (nValueIn < nValueToSelect) {
|
|
throw Exception("Insufficient funds");
|
|
}
|
|
|
|
// priority stuff???
|
|
|
|
BigInt nChange = nValueIn - nValueToSelect;
|
|
if (nChange > BigInt.zero) {
|
|
if (nChange < cryptoCurrency.dustLimit.raw) {
|
|
nChangePosInOut = -1;
|
|
nFeeRet += nChange;
|
|
} else {
|
|
if (nChangePosInOut == -1) {
|
|
nChangePosInOut = random.nextInt(vout.length + 1);
|
|
} else if (nChangePosInOut > vout.length) {
|
|
throw Exception("Change index out of range");
|
|
}
|
|
|
|
final changeAddress = await getCurrentChangeAddress();
|
|
vout.insert(
|
|
nChangePosInOut,
|
|
(changeAddress!.value, nChange.toInt()),
|
|
);
|
|
}
|
|
}
|
|
|
|
// add outputs for dummy tx to check fees
|
|
for (final out in vout) {
|
|
dummyTxb.addOutput(out.$1, out.$2);
|
|
}
|
|
|
|
// fill vin
|
|
for (final sd in setCoins) {
|
|
vin.add(sd);
|
|
|
|
// add to dummy tx
|
|
dummyTxb.addInput(
|
|
sd.utxo.txid,
|
|
sd.utxo.vout,
|
|
0xffffffff -
|
|
1, // minus 1 is important. 0xffffffff on its own will burn funds
|
|
sd.output,
|
|
);
|
|
}
|
|
|
|
// sign dummy tx
|
|
for (var i = 0; i < setCoins.length; i++) {
|
|
dummyTxb.sign(
|
|
vin: i,
|
|
keyPair: setCoins[i].keyPair!,
|
|
witnessValue: setCoins[i].utxo.value,
|
|
redeemScript: setCoins[i].redeemScript,
|
|
);
|
|
}
|
|
|
|
final dummyTx = dummyTxb.build();
|
|
final nBytes = dummyTx.virtualSize();
|
|
|
|
if (dummyTx.weight() > MAX_STANDARD_TX_WEIGHT) {
|
|
throw Exception("Transaction too large");
|
|
}
|
|
|
|
final nFeeNeeded = BigInt.from(
|
|
estimateTxFee(
|
|
vSize: nBytes,
|
|
feeRatePerKB: feesObject.medium,
|
|
),
|
|
); // One day we'll do this properly
|
|
|
|
if (nFeeRet >= nFeeNeeded) {
|
|
for (final usedCoin in setCoins) {
|
|
itr.removeWhere((e) => e == usedCoin.utxo);
|
|
}
|
|
if (itr.isEmpty) {
|
|
final preLength = valueAndUTXOs.length;
|
|
valueAndUTXOs.remove(itr);
|
|
assert(preLength - 1 == valueAndUTXOs.length);
|
|
}
|
|
|
|
// Generate real mint coins
|
|
final serialContext = LibSpark.serializeMintContext(
|
|
inputs: setCoins
|
|
.map((e) => (
|
|
e.utxo.txid,
|
|
e.utxo.vout,
|
|
))
|
|
.toList(),
|
|
);
|
|
final recipients = LibSpark.createSparkMintRecipients(
|
|
outputs: singleTxOutputs
|
|
.map(
|
|
(e) => (
|
|
sparkAddress: e.address,
|
|
memo: e.memo,
|
|
value: e.value.toInt(),
|
|
),
|
|
)
|
|
.toList(),
|
|
serialContext: serialContext,
|
|
generate: true,
|
|
);
|
|
|
|
int i = 0;
|
|
for (final recipient in recipients) {
|
|
final out = (recipient.scriptPubKey, recipient.amount);
|
|
while (i < vout.length) {
|
|
if (vout[i].$1 is Uint8List &&
|
|
(vout[i].$1 as Uint8List).isNotEmpty &&
|
|
(vout[i].$1 as Uint8List)[0] == OP_SPARKMINT) {
|
|
vout[i] = out;
|
|
break;
|
|
}
|
|
++i;
|
|
}
|
|
++i;
|
|
}
|
|
|
|
// deep copy
|
|
outputs_ = remainingOutputs
|
|
.map((e) => MutableSparkRecipient(e.address, e.value, e.memo))
|
|
.toList();
|
|
|
|
break; // Done, enough fee included.
|
|
}
|
|
|
|
// Include more fee and try again.
|
|
nFeeRet = nFeeNeeded;
|
|
continue;
|
|
}
|
|
|
|
if (skipCoin) {
|
|
continue;
|
|
}
|
|
|
|
// sign
|
|
final txb = btc.TransactionBuilder(network: _bitcoinDartNetwork);
|
|
txb.setVersion(txVersion);
|
|
txb.setLockTime(lockTime);
|
|
for (final input in vin) {
|
|
txb.addInput(
|
|
input.utxo.txid,
|
|
input.utxo.vout,
|
|
0xffffffff -
|
|
1, // minus 1 is important. 0xffffffff on its own will burn funds
|
|
input.output,
|
|
);
|
|
}
|
|
|
|
for (final output in vout) {
|
|
txb.addOutput(output.$1, output.$2);
|
|
}
|
|
|
|
try {
|
|
for (var i = 0; i < vin.length; i++) {
|
|
txb.sign(
|
|
vin: i,
|
|
keyPair: vin[i].keyPair!,
|
|
witnessValue: vin[i].utxo.value,
|
|
redeemScript: vin[i].redeemScript,
|
|
);
|
|
}
|
|
} catch (e, s) {
|
|
Logging.instance.log(
|
|
"Caught exception while signing spark mint transaction: $e\n$s",
|
|
level: LogLevel.Error,
|
|
);
|
|
rethrow;
|
|
}
|
|
final builtTx = txb.build();
|
|
|
|
// TODO: see todo at top of this function
|
|
assert(outputs.length == 1);
|
|
|
|
final data = TxData(
|
|
sparkRecipients: vout
|
|
.where((e) => e.$1 is Uint8List) // ignore change
|
|
.map(
|
|
(e) => (
|
|
address: outputs.first
|
|
.address, // for display purposes on confirm tx screen. See todos above
|
|
memo: "",
|
|
amount: Amount(
|
|
rawValue: BigInt.from(e.$2),
|
|
fractionDigits: cryptoCurrency.fractionDigits,
|
|
),
|
|
),
|
|
)
|
|
.toList(),
|
|
vSize: builtTx.virtualSize(),
|
|
txid: builtTx.getId(),
|
|
raw: builtTx.toHex(),
|
|
fee: Amount(
|
|
rawValue: nFeeRet,
|
|
fractionDigits: cryptoCurrency.fractionDigits,
|
|
),
|
|
usedUTXOs: vin.map((e) => e.utxo).toList(),
|
|
);
|
|
|
|
if (nFeeRet.toInt() < data.vSize!) {
|
|
throw Exception("fee is less than vSize");
|
|
}
|
|
|
|
results.add(data);
|
|
|
|
if (nChangePosInOut >= 0) {
|
|
final vOut = vout[nChangePosInOut];
|
|
assert(vOut.$1 is String); // check to make sure is change address
|
|
|
|
final out = UTXO(
|
|
walletId: walletId,
|
|
txid: data.txid!,
|
|
vout: nChangePosInOut,
|
|
value: vOut.$2,
|
|
address: vOut.$1 as String,
|
|
name: "Spark mint change",
|
|
isBlocked: false,
|
|
blockedReason: null,
|
|
isCoinbase: false,
|
|
blockHash: null,
|
|
blockHeight: null,
|
|
blockTime: null,
|
|
);
|
|
|
|
bool added = false;
|
|
for (final utxos in valueAndUTXOs) {
|
|
if (utxos.first.address == out.address) {
|
|
utxos.add(out);
|
|
added = true;
|
|
}
|
|
}
|
|
|
|
if (!added) {
|
|
valueAndUTXOs.add([out]);
|
|
}
|
|
}
|
|
|
|
if (!autoMintAll) {
|
|
valueToMint -= mintedValue;
|
|
if (valueToMint == BigInt.zero) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!autoMintAll && valueToMint > BigInt.zero) {
|
|
// TODO: Is this a valid error message?
|
|
throw Exception("Failed to mint expected amounts");
|
|
}
|
|
|
|
return results;
|
|
}
|
|
|
|
Future<void> anonymizeAllSpark() async {
|
|
try {
|
|
const subtractFeeFromAmount = true; // must be true for mint all
|
|
final currentHeight = await chainHeight;
|
|
|
|
final spendableUtxos = await mainDB.isar.utxos
|
|
.where()
|
|
.walletIdEqualTo(walletId)
|
|
.filter()
|
|
.isBlockedEqualTo(false)
|
|
.and()
|
|
.group((q) => q.usedEqualTo(false).or().usedIsNull())
|
|
.and()
|
|
.valueGreaterThan(0)
|
|
.findAll();
|
|
|
|
spendableUtxos.removeWhere(
|
|
(e) => !e.isConfirmed(
|
|
currentHeight,
|
|
cryptoCurrency.minConfirms,
|
|
),
|
|
);
|
|
|
|
if (spendableUtxos.isEmpty) {
|
|
throw Exception("No available UTXOs found to anonymize");
|
|
}
|
|
|
|
final mints = await _createSparkMintTransactions(
|
|
subtractFeeFromAmount: subtractFeeFromAmount,
|
|
autoMintAll: true,
|
|
availableUtxos: spendableUtxos,
|
|
outputs: [
|
|
MutableSparkRecipient(
|
|
(await getCurrentReceivingSparkAddress())!.value,
|
|
spendableUtxos
|
|
.map((e) => BigInt.from(e.value))
|
|
.fold(BigInt.zero, (p, e) => p + e),
|
|
"",
|
|
),
|
|
],
|
|
);
|
|
|
|
await confirmSparkMintTransactions(txData: TxData(sparkMints: mints));
|
|
} catch (e, s) {
|
|
Logging.instance.log(
|
|
"Exception caught in anonymizeAllSpark(): $e\n$s",
|
|
level: LogLevel.Warning,
|
|
);
|
|
rethrow;
|
|
}
|
|
}
|
|
|
|
/// Transparent to Spark (mint) transaction creation.
|
|
///
|
|
/// See https://docs.google.com/document/d/1RG52GoYTZDvKlZz_3G4sQu-PpT6JWSZGHLNswWcrE3o
|
|
Future<TxData> prepareSparkMintTransaction({required TxData txData}) async {
|
|
try {
|
|
if (txData.sparkRecipients?.isNotEmpty != true) {
|
|
throw Exception("Missing spark recipients.");
|
|
}
|
|
final recipients = txData.sparkRecipients!
|
|
.map(
|
|
(e) => MutableSparkRecipient(
|
|
e.address,
|
|
e.amount.raw,
|
|
e.memo,
|
|
),
|
|
)
|
|
.toList();
|
|
|
|
final total = recipients
|
|
.map((e) => e.value)
|
|
.reduce((value, element) => value += element);
|
|
|
|
if (total < BigInt.zero) {
|
|
throw Exception("Attempted send of negative amount");
|
|
} else if (total == BigInt.zero) {
|
|
throw Exception("Attempted send of zero amount");
|
|
}
|
|
|
|
final currentHeight = await chainHeight;
|
|
|
|
// coin control not enabled for firo currently so we can ignore this
|
|
// final utxosToUse = txData.utxos?.toList() ?? await mainDB.isar.utxos
|
|
// .where()
|
|
// .walletIdEqualTo(walletId)
|
|
// .filter()
|
|
// .isBlockedEqualTo(false)
|
|
// .and()
|
|
// .group((q) => q.usedEqualTo(false).or().usedIsNull())
|
|
// .and()
|
|
// .valueGreaterThan(0)
|
|
// .findAll();
|
|
final spendableUtxos = await mainDB.isar.utxos
|
|
.where()
|
|
.walletIdEqualTo(walletId)
|
|
.filter()
|
|
.isBlockedEqualTo(false)
|
|
.and()
|
|
.group((q) => q.usedEqualTo(false).or().usedIsNull())
|
|
.and()
|
|
.valueGreaterThan(0)
|
|
.findAll();
|
|
|
|
spendableUtxos.removeWhere(
|
|
(e) => !e.isConfirmed(
|
|
currentHeight,
|
|
cryptoCurrency.minConfirms,
|
|
),
|
|
);
|
|
|
|
if (spendableUtxos.isEmpty) {
|
|
throw Exception("No available UTXOs found to anonymize");
|
|
}
|
|
|
|
final available = spendableUtxos
|
|
.map((e) => BigInt.from(e.value))
|
|
.reduce((value, element) => value += element);
|
|
|
|
final bool subtractFeeFromAmount;
|
|
if (available < total) {
|
|
throw Exception("Insufficient balance");
|
|
} else if (available == total) {
|
|
subtractFeeFromAmount = true;
|
|
} else {
|
|
subtractFeeFromAmount = false;
|
|
}
|
|
|
|
final mints = await _createSparkMintTransactions(
|
|
subtractFeeFromAmount: subtractFeeFromAmount,
|
|
autoMintAll: false,
|
|
availableUtxos: spendableUtxos,
|
|
outputs: recipients,
|
|
);
|
|
|
|
return txData.copyWith(sparkMints: mints);
|
|
} catch (e, s) {
|
|
Logging.instance.log(
|
|
"Exception caught in prepareSparkMintTransaction(): $e\n$s",
|
|
level: LogLevel.Warning,
|
|
);
|
|
rethrow;
|
|
}
|
|
}
|
|
|
|
Future<TxData> confirmSparkMintTransactions({required TxData txData}) async {
|
|
final futures = txData.sparkMints!.map((e) => confirmSend(txData: e));
|
|
return txData.copyWith(sparkMints: await Future.wait(futures));
|
|
}
|
|
|
|
@override
|
|
Future<void> updateBalance() async {
|
|
// call to super to update transparent balance (and lelantus balance if
|
|
// what ever class this mixin is used on uses LelantusInterface as well)
|
|
final normalBalanceFuture = super.updateBalance();
|
|
|
|
// todo: spark balance aka update info.tertiaryBalance here?
|
|
// currently happens on spark coins update/refresh
|
|
|
|
// wait for normalBalanceFuture to complete before returning
|
|
await normalBalanceFuture;
|
|
}
|
|
|
|
// ====================== Private ============================================
|
|
|
|
final _kSparkAnonSetCachedBlockHashKey = "SparkAnonSetCachedBlockHashKey";
|
|
|
|
Future<String?> _getCachedSparkBlockHash() async {
|
|
return info.otherData[_kSparkAnonSetCachedBlockHashKey] as String?;
|
|
}
|
|
|
|
Future<void> _setCachedSparkBlockHash(String blockHash) async {
|
|
await info.updateOtherData(
|
|
newEntries: {_kSparkAnonSetCachedBlockHashKey: blockHash},
|
|
isar: mainDB.isar,
|
|
);
|
|
}
|
|
|
|
Future<void> _addOrUpdateSparkCoins(List<SparkCoin> coins) async {
|
|
if (coins.isNotEmpty) {
|
|
await mainDB.isar.writeTxn(() async {
|
|
await mainDB.isar.sparkCoins.putAll(coins);
|
|
});
|
|
}
|
|
|
|
// update wallet spark coin height
|
|
final coinsToCheck = await mainDB.isar.sparkCoins
|
|
.where()
|
|
.walletIdEqualToAnyLTagHash(walletId)
|
|
.filter()
|
|
.heightIsNull()
|
|
.findAll();
|
|
final List<SparkCoin> updatedCoins = [];
|
|
for (final coin in coinsToCheck) {
|
|
final tx = await electrumXCachedClient.getTransaction(
|
|
txHash: coin.txHash,
|
|
coin: info.coin,
|
|
);
|
|
if (tx["height"] is int) {
|
|
updatedCoins.add(coin.copyWith(height: tx["height"] as int));
|
|
}
|
|
}
|
|
if (updatedCoins.isNotEmpty) {
|
|
await mainDB.isar.writeTxn(() async {
|
|
await mainDB.isar.sparkCoins.putAll(updatedCoins);
|
|
});
|
|
}
|
|
}
|
|
|
|
btc.NetworkType get _bitcoinDartNetwork => btc.NetworkType(
|
|
messagePrefix: cryptoCurrency.networkParams.messagePrefix,
|
|
bech32: cryptoCurrency.networkParams.bech32Hrp,
|
|
bip32: btc.Bip32Type(
|
|
public: cryptoCurrency.networkParams.pubHDPrefix,
|
|
private: cryptoCurrency.networkParams.privHDPrefix,
|
|
),
|
|
pubKeyHash: cryptoCurrency.networkParams.p2pkhPrefix,
|
|
scriptHash: cryptoCurrency.networkParams.p2shPrefix,
|
|
wif: cryptoCurrency.networkParams.wifPrefix,
|
|
);
|
|
}
|
|
|
|
String base64ToReverseHex(String source) =>
|
|
base64Decode(LineSplitter.split(source).join())
|
|
.reversed
|
|
.map((e) => e.toRadixString(16).padLeft(2, '0'))
|
|
.join();
|
|
|
|
/// Top level function which should be called wrapped in [compute]
|
|
Future<
|
|
({
|
|
Uint8List serializedSpendPayload,
|
|
List<Uint8List> outputScripts,
|
|
int fee,
|
|
})> _createSparkSend(
|
|
({
|
|
String privateKeyHex,
|
|
int index,
|
|
List<
|
|
({
|
|
String address,
|
|
int amount,
|
|
bool subtractFeeFromAmount
|
|
})> recipients,
|
|
List<
|
|
({
|
|
String sparkAddress,
|
|
int amount,
|
|
bool subtractFeeFromAmount,
|
|
String memo
|
|
})> privateRecipients,
|
|
List<
|
|
({
|
|
String serializedCoin,
|
|
String serializedCoinContext,
|
|
int groupId,
|
|
int height,
|
|
})> serializedCoins,
|
|
List<
|
|
({
|
|
int setId,
|
|
String setHash,
|
|
List<({String serializedCoin, String txHash})> set
|
|
})> allAnonymitySets,
|
|
List<
|
|
({
|
|
int setId,
|
|
Uint8List blockHash,
|
|
})> idAndBlockHashes,
|
|
Uint8List txHash,
|
|
}) args) async {
|
|
final spend = LibSpark.createSparkSendTransaction(
|
|
privateKeyHex: args.privateKeyHex,
|
|
index: args.index,
|
|
recipients: args.recipients,
|
|
privateRecipients: args.privateRecipients,
|
|
serializedCoins: args.serializedCoins,
|
|
allAnonymitySets: args.allAnonymitySets,
|
|
idAndBlockHashes: args.idAndBlockHashes,
|
|
txHash: args.txHash,
|
|
);
|
|
|
|
return spend;
|
|
}
|
|
|
|
/// Top level function which should be called wrapped in [compute]
|
|
Future<List<SparkCoin>> _identifyCoins(
|
|
({
|
|
List<dynamic> anonymitySetCoins,
|
|
int groupId,
|
|
Set<String> spentCoinTags,
|
|
Set<String> privateKeyHexSet,
|
|
String walletId,
|
|
bool isTestNet,
|
|
}) args) async {
|
|
final List<SparkCoin> myCoins = [];
|
|
|
|
for (final privateKeyHex in args.privateKeyHexSet) {
|
|
for (final dynData in args.anonymitySetCoins) {
|
|
final data = List<String>.from(dynData as List);
|
|
|
|
if (data.length != 3) {
|
|
throw Exception("Unexpected serialized coin info found");
|
|
}
|
|
|
|
final serializedCoinB64 = data[0];
|
|
final txHash = base64ToReverseHex(data[1]);
|
|
final contextB64 = data[2];
|
|
|
|
final coin = LibSpark.identifyAndRecoverCoin(
|
|
serializedCoinB64,
|
|
privateKeyHex: privateKeyHex,
|
|
index: kDefaultSparkIndex,
|
|
context: base64Decode(contextB64),
|
|
isTestNet: args.isTestNet,
|
|
);
|
|
|
|
// its ours
|
|
if (coin != null) {
|
|
final SparkCoinType coinType;
|
|
switch (coin.type.value) {
|
|
case 0:
|
|
coinType = SparkCoinType.mint;
|
|
case 1:
|
|
coinType = SparkCoinType.spend;
|
|
default:
|
|
throw Exception("Unknown spark coin type detected");
|
|
}
|
|
myCoins.add(
|
|
SparkCoin(
|
|
walletId: args.walletId,
|
|
type: coinType,
|
|
isUsed: args.spentCoinTags.contains(coin.lTagHash!),
|
|
groupId: args.groupId,
|
|
nonce: coin.nonceHex?.toUint8ListFromHex,
|
|
address: coin.address!,
|
|
txHash: txHash,
|
|
valueIntString: coin.value!.toString(),
|
|
memo: coin.memo,
|
|
serialContext: coin.serialContext,
|
|
diversifierIntString: coin.diversifier!.toString(),
|
|
encryptedDiversifier: coin.encryptedDiversifier,
|
|
serial: coin.serial,
|
|
tag: coin.tag,
|
|
lTagHash: coin.lTagHash!,
|
|
height: coin.height,
|
|
serializedCoinB64: serializedCoinB64,
|
|
contextB64: contextB64,
|
|
),
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
return myCoins;
|
|
}
|
|
|
|
BigInt _min(BigInt a, BigInt b) {
|
|
if (a <= b) {
|
|
return a;
|
|
} else {
|
|
return b;
|
|
}
|
|
}
|
|
|
|
BigInt _sum(List<UTXO> utxos) => utxos
|
|
.map((e) => BigInt.from(e.value))
|
|
.fold(BigInt.zero, (previousValue, element) => previousValue + element);
|
|
|
|
class MutableSparkRecipient {
|
|
String address;
|
|
BigInt value;
|
|
String memo;
|
|
|
|
MutableSparkRecipient(this.address, this.value, this.memo);
|
|
|
|
@override
|
|
String toString() {
|
|
return 'MutableSparkRecipient{ address: $address, value: $value, memo: $memo }';
|
|
}
|
|
}
|