mirror of
https://github.com/cypherstack/stack_wallet.git
synced 2024-11-18 18:21:08 +00:00
569 lines
19 KiB
Dart
569 lines
19 KiB
Dart
import 'dart:convert';
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import 'dart:typed_data';
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import 'package:bip32/bip32.dart' as bip32;
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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:isar/isar.dart';
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import 'package:pointycastle/digests/sha256.dart';
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import 'package:stackwallet/db/main_db.dart';
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import 'package:stackwallet/electrumx_rpc/cached_electrumx.dart';
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import 'package:stackwallet/electrumx_rpc/electrumx.dart';
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import 'package:stackwallet/exceptions/wallet/insufficient_balance_exception.dart';
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import 'package:stackwallet/models/isar/models/isar_models.dart';
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import 'package:stackwallet/utilities/address_utils.dart';
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import 'package:stackwallet/utilities/bip32_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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import 'package:stackwallet/exceptions/wallet/paynym_send_exception.dart';
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mixin PaynymSupport {
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late final btc_dart.NetworkType network;
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late final MainDB db;
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late final Coin coin;
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late final String walletId;
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void initPaynymSupport({
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required btc_dart.NetworkType network,
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required MainDB db,
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required Coin coin,
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required String walletId,
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}) {
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this.network = network;
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this.db = db;
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this.coin = coin;
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this.walletId = walletId;
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}
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// generate bip32 payment code root
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Future<bip32.BIP32> getRootNode({required List<String> mnemonic}) async {
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final root = await Bip32Utils.getBip32Root(mnemonic.join(" "), network);
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return root;
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}
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// fetch or generate this wallet's bip47 payment code
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Future<PaymentCode> getPaymentCode({
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required List<String> mnemonic,
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}) async {
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// TODO: cache elsewhere
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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 root = await getRootNode(mnemonic: mnemonic);
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final node = root.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({
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required Uint8List data,
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required List<String> mnemonic,
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}) async {
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final root = await getRootNode(
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mnemonic: mnemonic,
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);
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final node = root.derivePath("m/47'/0'/0'");
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final pair = 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({
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required String data,
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required List<String> mnemonic,
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}) async {
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final bytes = await signWithNotificationKey(
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data: Uint8List.fromList(utf8.encode(data)),
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mnemonic: mnemonic,
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);
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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({
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required Coin coin,
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required PaymentCode paymentCode,
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required ElectrumX electrumXClient,
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required CachedElectrumX cachedElectrumXClient,
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required int currentChainHeight,
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}) async {
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final notificationAddress = paymentCode.notificationAddress();
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final receivedNotificationTransactions = await db
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.getTransactions(walletId)
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.filter()
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.address((q) => q.valueEqualTo(notificationAddress))
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.findAll();
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final unconfirmedTransactions = receivedNotificationTransactions.where(
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(e) => !e.isConfirmed(
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currentChainHeight,
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coin.requiredConfirmations,
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),
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);
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final totalStoredCount = receivedNotificationTransactions.length;
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final storedUnconfirmedCount = unconfirmedTransactions.length;
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// for (final txid in transactionIds) {
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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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//
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// // check if tx is confirmed
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// if ((tx["confirmations"] as int? ?? 0) > coin.requiredConfirmations) {
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// // remove it from unconfirmed set
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// unconfirmedNotificationTransactionIds.remove(txid);
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//
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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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//
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// final newTotalCount = confirmedNotificationTransactionIds.length +
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// unconfirmedNotificationTransactionIds.length;
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//
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// return newTotalCount > totalCount;
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return false;
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}
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// bool hasConnected(String paymentCodeString) {
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// return getPaynymNotificationTxInfo()
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// .values
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// .where((e) => e["paymentCodeString"] == paymentCodeString)
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// .isNotEmpty;
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// }
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//
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// bool hasConnectedConfirmed(String paymentCodeString) {
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// return getPaynymNotificationTxInfo()
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// .values
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// .where((e) =>
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// e["paymentCodeString"] == paymentCodeString &&
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// e["confirmed"] == true)
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// .isNotEmpty;
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// }
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//
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// // fetch paynym notification tx meta data
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// Map<String, dynamic> getPaynymNotificationTxInfo() {
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// final map = DB.instance.get<dynamic>(
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// boxName: walletId, key: "paynymNotificationTxInfo") as Map? ??
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// {};
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//
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// return Map<String, dynamic>.from(map);
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// }
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// // add/update paynym notification tx meta data entry
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// Future<void> updatePaynymNotificationInfo({
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// required String txid,
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// required bool confirmed,
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// required String paymentCodeString,
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// }) async {
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// final data = getPaynymNotificationTxInfo();
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// data[txid] = {
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// "txid": txid,
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// "confirmed": confirmed,
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// "paymentCodeString": paymentCodeString,
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// };
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// await DB.instance.put<dynamic>(
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// boxName: walletId,
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// key: "paynymNotificationTxInfo",
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// value: data,
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// );
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// }
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Future<Transaction?> hasSentNotificationTx(PaymentCode pCode) async {
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final tx = await db
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.getTransactions(walletId)
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.filter()
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.address((q) => q.valueEqualTo(pCode.notificationAddress())).countSync()
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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 ( ;
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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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required PaymentCode myPaymentCode,
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int additionalOutputs = 0,
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required List<UTXO> utxos,
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required int dustLimit,
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required int chainHeight,
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required Future<Map<String, dynamic>> Function(
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List< UTXO>
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) fetchBuildTxData,
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}) async {
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final amountToSend = dustLimit;
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final List<UTXO> availableOutputs = 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( chainHeight, coin.requiredConfirmations) ==
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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, myPaymentCode: myPaymentCode, dustLimit: dustLimit, changeAddress: ))
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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, myPaymentCode: myPaymentCode, dustLimit: dustLimit, changeAddress: ch,))
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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 + dustLimit) {
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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 >= dustLimit &&
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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, myPaymentCode: null,
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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, utxos: utxos, dustLimit: dustLimit, chainHeight: chainHeight, fetchBuildTxData: fetchBuildTxData,
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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 PaymentCode myPaymentCode,
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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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required int dustLimit,
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required Address changeAddress,
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}) async {
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final targetPaymentCode =
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PaymentCode.fromPaymentCode(targetPaymentCodeString, network);
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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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myPaymentCode.getPayload(),
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blindingMask,
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);
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|
|
final opReturnScript = bscript.compile([
|
|
(op.OPS["OP_RETURN"] as int),
|
|
blindedPaymentCode,
|
|
]);
|
|
|
|
// build a notification tx
|
|
final txb = btc_dart.TransactionBuilder(network: network);
|
|
txb.setVersion(1);
|
|
|
|
txb.addInput(
|
|
utxo.txid,
|
|
txPointIndex,
|
|
);
|
|
|
|
txb.addOutput(targetPaymentCode.notificationAddress(), dustLimit);
|
|
txb.addOutput(opReturnScript, 0);
|
|
|
|
// TODO: add possible change output and mark output as dangerous
|
|
if (change > 0) {
|
|
final String changeAddressString = changeAddress.value;
|
|
txb.addOutput(changeAddressString, change);
|
|
}
|
|
|
|
txb.sign(
|
|
vin: 0,
|
|
keyPair: myKeyPair,
|
|
);
|
|
|
|
// sign rest of possible inputs
|
|
for (var i = 1; i < utxosToUse.length - 1; i++) {
|
|
final txid = utxosToUse[i].txid;
|
|
txb.sign(
|
|
vin: i,
|
|
keyPair: utxoSigningData[txid]["keyPair"] as ECPair,
|
|
// witnessValue: utxosToUse[i].value,
|
|
);
|
|
}
|
|
|
|
final builtTx = txb.build();
|
|
|
|
return Tuple2(builtTx.toHex(), builtTx.virtualSize());
|
|
}
|
|
|
|
Future<String> confirmSendNotificationTx(
|
|
{required Map<String, dynamic> preparedTx, required ElectrumX electrumXClient,}) async {
|
|
try {
|
|
Logging.instance.log("confirmNotificationTx txData: $preparedTx",
|
|
level: LogLevel.Info);
|
|
final txHash = await electrumXClient.broadcastTransaction(
|
|
rawTx: preparedTx["hex"] as String);
|
|
Logging.instance.log("Sent txHash: $txHash", level: LogLevel.Info);
|
|
|
|
|
|
return txHash;
|
|
} catch (e, s) {
|
|
Logging.instance.log("Exception rethrown from confirmSend(): $e\n$s",
|
|
level: LogLevel.Error);
|
|
rethrow;
|
|
}
|
|
}
|
|
|
|
}
|