mirror of
https://github.com/cypherstack/stack_wallet.git
synced 2024-09-30 02:11:22 +00:00
730 lines
23 KiB
Dart
730 lines
23 KiB
Dart
import 'dart:convert';
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import 'dart:typed_data';
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import 'package:bip47/bip47.dart';
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import 'package:bip47/src/util.dart';
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import 'package:bitcoindart/bitcoindart.dart' as btc_dart;
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import 'package:bitcoindart/src/utils/constants/op.dart' as op;
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import 'package:bitcoindart/src/utils/script.dart' as bscript;
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import 'package:decimal/decimal.dart';
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import 'package:isar/isar.dart';
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import 'package:pointycastle/digests/sha256.dart';
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import 'package:stackwallet/hive/db.dart';
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import 'package:stackwallet/models/isar/models/isar_models.dart';
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import 'package:stackwallet/services/coins/dogecoin/dogecoin_wallet.dart';
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import 'package:stackwallet/utilities/address_utils.dart';
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import 'package:stackwallet/utilities/enums/coin_enum.dart';
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import 'package:stackwallet/utilities/format.dart';
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import 'package:stackwallet/utilities/logger.dart';
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import 'package:tuple/tuple.dart';
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class SWException with Exception {
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SWException(this.message);
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final String message;
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@override
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toString() => message;
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}
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class InsufficientBalanceException extends SWException {
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InsufficientBalanceException(super.message);
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}
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class PaynymSendException extends SWException {
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PaynymSendException(super.message);
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}
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extension PayNym on DogecoinWallet {
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// fetch or generate this wallet's bip47 payment code
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Future<PaymentCode> getPaymentCode() async {
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final paymentCodeString = DB.instance
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.get<dynamic>(boxName: walletId, key: "paymentCodeString") as String?;
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PaymentCode paymentCode;
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if (paymentCodeString == null) {
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final node = getBip32Root((await mnemonic).join(" "), network)
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.derivePath("m/47'/0'/0'");
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paymentCode =
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PaymentCode.initFromPubKey(node.publicKey, node.chainCode, network);
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await DB.instance.put<dynamic>(
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boxName: walletId,
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key: "paymentCodeString",
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value: paymentCode.toString());
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} else {
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paymentCode = PaymentCode.fromPaymentCode(paymentCodeString, network);
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}
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return paymentCode;
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}
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Future<Uint8List> signWithNotificationKey(Uint8List data) async {
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final node = getBip32Root((await mnemonic).join(" "), network)
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.derivePath("m/47'/0'/0'");
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final pair =
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btc_dart.ECPair.fromPrivateKey(node.privateKey!, network: network);
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final signed = pair.sign(SHA256Digest().process(data));
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return signed;
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}
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Future<String> signStringWithNotificationKey(String data) async {
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final bytes =
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await signWithNotificationKey(Uint8List.fromList(utf8.encode(data)));
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return Format.uint8listToString(bytes);
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// final bytes =
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// await signWithNotificationKey(Uint8List.fromList(utf8.encode(data)));
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// return Format.uint8listToString(bytes);
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}
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/// Update cached lists of notification transaction IDs.
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/// Returns true if there are new notification transactions found since last
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/// checked.
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Future<bool> checkForNotificationTransactions() async {
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final myPCode = await getPaymentCode();
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final transactionIds = await electrumXClient.getHistory(
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scripthash: AddressUtils.convertToScriptHash(
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myPCode.notificationAddress(),
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network,
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),
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);
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final confirmedNotificationTransactionIds = DB.instance.get<dynamic>(
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boxName: walletId,
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key: "confirmedNotificationTransactionIds",
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) as Set? ??
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{};
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final unconfirmedNotificationTransactionIds = DB.instance.get<dynamic>(
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boxName: walletId,
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key: "unconfirmedNotificationTransactionIds",
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) as Set? ??
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{};
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// since we are only checking for newly found transactions here we can use the sum
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final totalCount = confirmedNotificationTransactionIds.length +
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unconfirmedNotificationTransactionIds.length;
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for (final entry in transactionIds) {
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final txid = entry["tx_hash"] as String;
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final tx = await cachedElectrumXClient.getTransaction(
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txHash: txid,
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coin: coin,
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);
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// check if tx is confirmed
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if ((tx["confirmations"] as int? ?? 0) > MINIMUM_CONFIRMATIONS) {
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// remove it from unconfirmed set
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unconfirmedNotificationTransactionIds.remove(txid);
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// add it to confirmed set
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confirmedNotificationTransactionIds.add(txid);
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} else {
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// otherwise add it to the unconfirmed set
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unconfirmedNotificationTransactionIds.add(txid);
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}
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}
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final newTotalCount = confirmedNotificationTransactionIds.length +
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unconfirmedNotificationTransactionIds.length;
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return newTotalCount > totalCount;
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}
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/// return the notification tx sent from my wallet if it exists
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Future<Transaction?> hasSentNotificationTx(PaymentCode pCode) async {
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final tx = await isar.transactions
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.filter()
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.addressEqualTo(pCode.notificationAddress())
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.findFirst();
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return tx;
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}
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void preparePaymentCodeSend(PaymentCode pCode) async {
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final notifTx = await hasSentNotificationTx(pCode);
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final currentHeight = await chainHeight;
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if (notifTx == null) {
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throw PaynymSendException("No notification transaction sent to $pCode");
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} else if (!notifTx.isConfirmed(currentHeight, MINIMUM_CONFIRMATIONS)) {
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throw PaynymSendException(
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"Notification transaction sent to $pCode has not confirmed yet");
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} else {
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final node = getBip32Root((await mnemonic).join(" "), network)
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.derivePath("m/47'/0'/0'");
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final sendToAddress = await nextUnusedSendAddressFrom(
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pCode,
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node.derive(0).privateKey!,
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);
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// todo: Actual transaction build
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}
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}
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/// get the next unused address to send to given the receiver's payment code
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/// and your own private key
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Future<String> nextUnusedSendAddressFrom(
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PaymentCode pCode,
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Uint8List privateKey,
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) async {
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// https://en.bitcoin.it/wiki/BIP_0047#Path_levels
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const maxCount = 2147483647;
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final paymentAddress = PaymentAddress.initWithPrivateKey(
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privateKey,
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pCode,
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0, // initial index to check
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);
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for (paymentAddress.index = 0;
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paymentAddress.index <= maxCount;
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paymentAddress.index++) {
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final address = paymentAddress.getSendAddress();
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final transactionIds = await electrumXClient.getHistory(
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scripthash: AddressUtils.convertToScriptHash(
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address,
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network,
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),
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);
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if (transactionIds.isEmpty) {
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return address;
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}
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}
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throw PaynymSendException("Exhausted unused send addresses!");
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}
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/// get your receiving addresses given the sender's payment code and your own
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/// private key
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List<String> deriveReceivingAddressesFor(
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PaymentCode pCode,
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Uint8List privateKey,
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int count,
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) {
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// https://en.bitcoin.it/wiki/BIP_0047#Path_levels
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const maxCount = 2147483647;
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assert(count <= maxCount);
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final paymentAddress = PaymentAddress.initWithPrivateKey(
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privateKey,
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pCode,
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0, // initial index
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);
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final List<String> result = [];
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for (paymentAddress.index = 0;
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paymentAddress.index < count;
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paymentAddress.index++) {
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final address = paymentAddress.getReceiveAddress();
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result.add(address);
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}
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return result;
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}
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Future<Map<String, dynamic>> buildNotificationTx({
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required int selectedTxFeeRate,
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required String targetPaymentCodeString,
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int additionalOutputs = 0,
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List<UTXO>? utxos,
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}) async {
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const amountToSend = DUST_LIMIT;
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final List<UTXO> availableOutputs = utxos ?? await this.utxos;
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final List<UTXO> spendableOutputs = [];
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int spendableSatoshiValue = 0;
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// Build list of spendable outputs and totaling their satoshi amount
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for (var i = 0; i < availableOutputs.length; i++) {
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if (availableOutputs[i].isBlocked == false &&
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availableOutputs[i]
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.isConfirmed(await chainHeight, MINIMUM_CONFIRMATIONS) ==
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true) {
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spendableOutputs.add(availableOutputs[i]);
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spendableSatoshiValue += availableOutputs[i].value;
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}
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}
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if (spendableSatoshiValue < amountToSend) {
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// insufficient balance
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throw InsufficientBalanceException(
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"Spendable balance is less than the minimum required for a notification transaction.");
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} else if (spendableSatoshiValue == amountToSend) {
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// insufficient balance due to missing amount to cover fee
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throw InsufficientBalanceException(
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"Remaining balance does not cover the network fee.");
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}
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// sort spendable by age (oldest first)
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spendableOutputs.sort((a, b) => b.blockTime!.compareTo(a.blockTime!));
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int satoshisBeingUsed = 0;
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int outputsBeingUsed = 0;
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List<UTXO> utxoObjectsToUse = [];
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for (int i = 0;
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satoshisBeingUsed < amountToSend && i < spendableOutputs.length;
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i++) {
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utxoObjectsToUse.add(spendableOutputs[i]);
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satoshisBeingUsed += spendableOutputs[i].value;
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outputsBeingUsed += 1;
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}
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// add additional outputs if required
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for (int i = 0;
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i < additionalOutputs && outputsBeingUsed < spendableOutputs.length;
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i++) {
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utxoObjectsToUse.add(spendableOutputs[outputsBeingUsed]);
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satoshisBeingUsed += spendableOutputs[outputsBeingUsed].value;
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outputsBeingUsed += 1;
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}
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// gather required signing data
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final utxoSigningData = await fetchBuildTxData(utxoObjectsToUse);
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final int vSizeForNoChange = (await _createNotificationTx(
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targetPaymentCodeString: targetPaymentCodeString,
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utxosToUse: utxoObjectsToUse,
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utxoSigningData: utxoSigningData,
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change: 0))
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.item2;
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final int vSizeForWithChange = (await _createNotificationTx(
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targetPaymentCodeString: targetPaymentCodeString,
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utxosToUse: utxoObjectsToUse,
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utxoSigningData: utxoSigningData,
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change: satoshisBeingUsed - amountToSend))
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.item2;
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// Assume 2 outputs, for recipient and payment code script
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int feeForNoChange = estimateTxFee(
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vSize: vSizeForNoChange,
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feeRatePerKB: selectedTxFeeRate,
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);
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// Assume 3 outputs, for recipient, payment code script, and change
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int feeForWithChange = estimateTxFee(
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vSize: vSizeForWithChange,
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feeRatePerKB: selectedTxFeeRate,
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);
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if (feeForNoChange < vSizeForNoChange * 1000) {
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feeForNoChange = vSizeForNoChange * 1000;
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}
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if (feeForWithChange < vSizeForWithChange * 1000) {
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feeForWithChange = vSizeForWithChange * 1000;
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}
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if (satoshisBeingUsed - amountToSend > feeForNoChange + DUST_LIMIT) {
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// try to add change output due to "left over" amount being greater than
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// the estimated fee + the dust limit
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int changeAmount = satoshisBeingUsed - amountToSend - feeForWithChange;
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// check estimates are correct and build notification tx
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if (changeAmount >= DUST_LIMIT &&
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satoshisBeingUsed - amountToSend - changeAmount == feeForWithChange) {
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final txn = await _createNotificationTx(
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targetPaymentCodeString: targetPaymentCodeString,
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utxosToUse: utxoObjectsToUse,
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utxoSigningData: utxoSigningData,
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change: changeAmount,
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);
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int feeBeingPaid = satoshisBeingUsed - amountToSend - changeAmount;
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Map<String, dynamic> transactionObject = {
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"hex": txn.item1,
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"recipientPaynym": targetPaymentCodeString,
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"amount": amountToSend,
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"fee": feeBeingPaid,
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"vSize": txn.item2,
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};
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return transactionObject;
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} else {
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// something broke during fee estimation or the change amount is smaller
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// than the dust limit. Try without change
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final txn = await _createNotificationTx(
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targetPaymentCodeString: targetPaymentCodeString,
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utxosToUse: utxoObjectsToUse,
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utxoSigningData: utxoSigningData,
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change: 0,
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);
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int feeBeingPaid = satoshisBeingUsed - amountToSend;
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Map<String, dynamic> transactionObject = {
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"hex": txn.item1,
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"recipientPaynym": targetPaymentCodeString,
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"amount": amountToSend,
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"fee": feeBeingPaid,
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"vSize": txn.item2,
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};
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return transactionObject;
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}
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} else if (satoshisBeingUsed - amountToSend >= feeForNoChange) {
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// since we already checked if we need to add a change output we can just
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// build without change here
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final txn = await _createNotificationTx(
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targetPaymentCodeString: targetPaymentCodeString,
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utxosToUse: utxoObjectsToUse,
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utxoSigningData: utxoSigningData,
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change: 0,
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);
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int feeBeingPaid = satoshisBeingUsed - amountToSend;
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Map<String, dynamic> transactionObject = {
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"hex": txn.item1,
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"recipientPaynym": targetPaymentCodeString,
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"amount": amountToSend,
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"fee": feeBeingPaid,
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"vSize": txn.item2,
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};
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return transactionObject;
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} else {
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// if we get here we do not have enough funds to cover the tx total so we
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// check if we have any more available outputs and try again
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if (spendableOutputs.length > outputsBeingUsed) {
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return buildNotificationTx(
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selectedTxFeeRate: selectedTxFeeRate,
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targetPaymentCodeString: targetPaymentCodeString,
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additionalOutputs: additionalOutputs + 1,
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);
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} else {
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throw InsufficientBalanceException(
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"Remaining balance does not cover the network fee.");
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}
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}
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}
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// return tuple with string value equal to the raw tx hex and the int value
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// equal to its vSize
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Future<Tuple2<String, int>> _createNotificationTx({
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required String targetPaymentCodeString,
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required List<UTXO> utxosToUse,
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required Map<String, dynamic> utxoSigningData,
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required int change,
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}) async {
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final targetPaymentCode =
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PaymentCode.fromPaymentCode(targetPaymentCodeString, network);
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final myCode = await getPaymentCode();
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final utxo = utxosToUse.first;
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final txPoint = utxo.txid.fromHex.toList();
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final txPointIndex = utxo.vout;
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final rev = Uint8List(txPoint.length + 4);
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Util.copyBytes(Uint8List.fromList(txPoint), 0, rev, 0, txPoint.length);
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final buffer = rev.buffer.asByteData();
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buffer.setUint32(txPoint.length, txPointIndex, Endian.little);
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final myKeyPair = utxoSigningData[utxo.txid]["keyPair"] as btc_dart.ECPair;
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final S = SecretPoint(
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myKeyPair.privateKey!,
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targetPaymentCode.notificationPublicKey(),
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);
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final blindingMask = PaymentCode.getMask(S.ecdhSecret(), rev);
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final blindedPaymentCode = PaymentCode.blind(
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myCode.getPayload(),
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blindingMask,
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);
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final opReturnScript = bscript.compile([
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(op.OPS["OP_RETURN"] as int),
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blindedPaymentCode,
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]);
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// build a notification tx
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final txb = btc_dart.TransactionBuilder(network: network);
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txb.setVersion(1);
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txb.addInput(
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utxo.txid,
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txPointIndex,
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);
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txb.addOutput(targetPaymentCode.notificationAddress(), DUST_LIMIT);
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txb.addOutput(opReturnScript, 0);
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// TODO: add possible change output and mark output as dangerous
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if (change > 0) {
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// generate new change address if current change address has been used
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await checkChangeAddressForTransactions();
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final String changeAddress = await currentChangeAddress;
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txb.addOutput(changeAddress, change);
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}
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txb.sign(
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vin: 0,
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keyPair: myKeyPair,
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);
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// sign rest of possible inputs
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for (var i = 1; i < utxosToUse.length - 1; i++) {
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final txid = utxosToUse[i].txid;
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txb.sign(
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vin: i,
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keyPair: utxoSigningData[txid]["keyPair"] as btc_dart.ECPair,
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// witnessValue: utxosToUse[i].value,
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);
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}
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final builtTx = txb.build();
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return Tuple2(builtTx.toHex(), builtTx.virtualSize());
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}
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Future<String> confirmNotificationTx(
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{required Map<String, dynamic> preparedTx}) async {
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try {
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Logging.instance.log("confirmNotificationTx txData: $preparedTx",
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level: LogLevel.Info);
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final txHash = await electrumXClient.broadcastTransaction(
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rawTx: preparedTx["hex"] as String);
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Logging.instance.log("Sent txHash: $txHash", level: LogLevel.Info);
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await updatePaynymNotificationInfo(
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txid: txHash,
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confirmed: false,
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paymentCodeString: preparedTx["address"] as String,
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);
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return txHash;
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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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// Future<bool> hasConfirmedNotificationTxSentTo(
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// String paymentCodeString) async {
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// final targetPaymentCode =
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// PaymentCode.fromPaymentCode(paymentCodeString, network);
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// final targetNotificationAddress = targetPaymentCode.notificationAddress();
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//
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// final myTxHistory = (await transactionData)
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// .getAllTransactions()
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// .entries
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// .map((e) => e.value)
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// .where((e) =>
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// e.txType == "Sent" && e.address == targetNotificationAddress);
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//
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// return myTxHistory.isNotEmpty;
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// }
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bool hasConnected(String paymentCodeString) {
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return getPaynymNotificationTxInfo()
|
|
.values
|
|
.where((e) => e["paymentCodeString"] == paymentCodeString)
|
|
.isNotEmpty;
|
|
}
|
|
|
|
bool hasConnectedConfirmed(String paymentCodeString) {
|
|
return getPaynymNotificationTxInfo()
|
|
.values
|
|
.where((e) =>
|
|
e["paymentCodeString"] == paymentCodeString &&
|
|
e["confirmed"] == true)
|
|
.isNotEmpty;
|
|
}
|
|
|
|
// fetch paynym notification tx meta data
|
|
Map<String, dynamic> getPaynymNotificationTxInfo() {
|
|
final map = DB.instance.get<dynamic>(
|
|
boxName: walletId, key: "paynymNotificationTxInfo") as Map? ??
|
|
{};
|
|
|
|
return Map<String, dynamic>.from(map);
|
|
}
|
|
|
|
// add/update paynym notification tx meta data entry
|
|
Future<void> updatePaynymNotificationInfo({
|
|
required String txid,
|
|
required bool confirmed,
|
|
required String paymentCodeString,
|
|
}) async {
|
|
final data = getPaynymNotificationTxInfo();
|
|
data[txid] = {
|
|
"txid": txid,
|
|
"confirmed": confirmed,
|
|
"paymentCodeString": paymentCodeString,
|
|
};
|
|
await DB.instance.put<dynamic>(
|
|
boxName: walletId,
|
|
key: "paynymNotificationTxInfo",
|
|
value: data,
|
|
);
|
|
}
|
|
}
|
|
|
|
Future<Transaction> parseTransaction(
|
|
Map<String, dynamic> txData,
|
|
dynamic electrumxClient,
|
|
List<Address> myAddresses,
|
|
Coin coin,
|
|
int minConfirms,
|
|
) async {
|
|
Set<String> receivingAddresses = myAddresses
|
|
.where((e) => e.subType == AddressSubType.receiving)
|
|
.map((e) => e.value)
|
|
.toSet();
|
|
Set<String> changeAddresses = myAddresses
|
|
.where((e) => e.subType == AddressSubType.change)
|
|
.map((e) => e.value)
|
|
.toSet();
|
|
|
|
Set<String> inputAddresses = {};
|
|
Set<String> outputAddresses = {};
|
|
|
|
int totalInputValue = 0;
|
|
int totalOutputValue = 0;
|
|
|
|
int amountSentFromWallet = 0;
|
|
int amountReceivedInWallet = 0;
|
|
int changeAmount = 0;
|
|
|
|
// parse inputs
|
|
for (final input in txData["vin"] as List) {
|
|
final prevTxid = input["txid"] as String;
|
|
final prevOut = input["vout"] as int;
|
|
|
|
// fetch input tx to get address
|
|
final inputTx = await electrumxClient.getTransaction(
|
|
txHash: prevTxid,
|
|
coin: coin,
|
|
);
|
|
|
|
for (final output in inputTx["vout"] as List) {
|
|
// check matching output
|
|
if (prevOut == output["n"]) {
|
|
// get value
|
|
final value = Format.decimalAmountToSatoshis(
|
|
Decimal.parse(output["value"].toString()),
|
|
coin,
|
|
);
|
|
|
|
// add value to total
|
|
totalInputValue += value;
|
|
|
|
// get input(prevOut) address
|
|
final address = output["scriptPubKey"]?["addresses"]?[0] as String? ??
|
|
output["scriptPubKey"]?["address"] as String?;
|
|
|
|
if (address != null) {
|
|
inputAddresses.add(address);
|
|
|
|
// if input was from my wallet, add value to amount sent
|
|
if (receivingAddresses.contains(address) ||
|
|
changeAddresses.contains(address)) {
|
|
amountSentFromWallet += value;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// parse outputs
|
|
for (final output in txData["vout"] as List) {
|
|
// get value
|
|
final value = Format.decimalAmountToSatoshis(
|
|
Decimal.parse(output["value"].toString()),
|
|
coin,
|
|
);
|
|
|
|
// add value to total
|
|
totalOutputValue += value;
|
|
|
|
// get output address
|
|
final address = output["scriptPubKey"]?["addresses"]?[0] as String? ??
|
|
output["scriptPubKey"]?["address"] as String?;
|
|
if (address != null) {
|
|
outputAddresses.add(address);
|
|
|
|
// if output was to my wallet, add value to amount received
|
|
if (receivingAddresses.contains(address)) {
|
|
amountReceivedInWallet += value;
|
|
} else if (changeAddresses.contains(address)) {
|
|
changeAmount += value;
|
|
}
|
|
}
|
|
}
|
|
|
|
final mySentFromAddresses = [
|
|
...receivingAddresses.intersection(inputAddresses),
|
|
...changeAddresses.intersection(inputAddresses)
|
|
];
|
|
final myReceivedOnAddresses =
|
|
receivingAddresses.intersection(outputAddresses);
|
|
final myChangeReceivedOnAddresses =
|
|
changeAddresses.intersection(outputAddresses);
|
|
|
|
final fee = totalInputValue - totalOutputValue;
|
|
|
|
final tx = Transaction();
|
|
tx.txid = txData["txid"] as String;
|
|
tx.timestamp = txData["blocktime"] as int? ??
|
|
(DateTime.now().millisecondsSinceEpoch ~/ 1000);
|
|
|
|
if (mySentFromAddresses.isNotEmpty && myReceivedOnAddresses.isNotEmpty) {
|
|
// tx is sent to self
|
|
tx.type = TransactionType.sentToSelf;
|
|
tx.amount =
|
|
amountSentFromWallet - amountReceivedInWallet - fee - changeAmount;
|
|
} else if (mySentFromAddresses.isNotEmpty) {
|
|
// outgoing tx
|
|
tx.type = TransactionType.outgoing;
|
|
tx.amount = amountSentFromWallet - changeAmount - fee;
|
|
} else {
|
|
// incoming tx
|
|
tx.type = TransactionType.incoming;
|
|
tx.amount = amountReceivedInWallet;
|
|
}
|
|
|
|
// TODO: other subtypes
|
|
tx.subType = TransactionSubType.none;
|
|
|
|
tx.fee = fee;
|
|
tx.address = txData["address"] as String;
|
|
|
|
for (final json in txData["vin"] as List) {
|
|
bool isCoinBase = json['coinbase'] != null;
|
|
final input = Input();
|
|
input.txid = json['txid'] as String;
|
|
input.vout = json['vout'] as int? ?? -1;
|
|
input.scriptSig = json['scriptSig']?['hex'] as String?;
|
|
input.scriptSigAsm = json['scriptSig']?['asm'] as String?;
|
|
input.isCoinbase = isCoinBase ? isCoinBase : json['is_coinbase'] as bool?;
|
|
input.sequence = json['sequence'] as int?;
|
|
input.innerRedeemScriptAsm = json['innerRedeemscriptAsm'] as String?;
|
|
tx.inputs.add(input);
|
|
}
|
|
|
|
for (final json in txData["vout"] as List) {
|
|
final output = Output();
|
|
output.scriptPubKey = json['scriptPubKey']?['hex'] as String?;
|
|
output.scriptPubKeyAsm = json['scriptPubKey']?['asm'] as String?;
|
|
output.scriptPubKeyType = json['scriptPubKey']?['type'] as String?;
|
|
output.scriptPubKeyAddress =
|
|
json["scriptPubKey"]?["addresses"]?[0] as String? ??
|
|
json['scriptPubKey']['type'] as String;
|
|
output.value = Format.decimalAmountToSatoshis(
|
|
Decimal.parse(json["value"].toString()),
|
|
coin,
|
|
);
|
|
tx.outputs.add(output);
|
|
}
|
|
|
|
tx.height = txData["height"] as int?;
|
|
|
|
//TODO: change these for epic (or other coins that need it)
|
|
tx.isCancelled = false;
|
|
tx.slateId = null;
|
|
tx.otherData = null;
|
|
tx.isLelantus = null;
|
|
|
|
return tx;
|
|
}
|