stack_wallet/lib/services/mixins/paynym_wallet_interface.dart
2023-05-27 00:21:16 +03:00

1411 lines
43 KiB
Dart

/*
* This file is part of Stack Wallet.
*
* Copyright (c) 2023 Cypher Stack
* All Rights Reserved.
* The code is distributed under GPLv3 license, see LICENSE file for details.
* Generated by Cypher Stack on 2023-05-26
*
*/
import 'dart:convert';
import 'dart:math';
import 'dart:typed_data';
import 'package:bip32/bip32.dart' as bip32;
import 'package:bip47/bip47.dart';
import 'package:bip47/src/util.dart';
import 'package:bitcoindart/bitcoindart.dart' as btc_dart;
import 'package:bitcoindart/src/utils/constants/op.dart' as op;
import 'package:bitcoindart/src/utils/script.dart' as bscript;
import 'package:isar/isar.dart';
import 'package:pointycastle/digests/sha256.dart';
import 'package:stackwallet/db/isar/main_db.dart';
import 'package:stackwallet/electrumx_rpc/electrumx.dart';
import 'package:stackwallet/exceptions/wallet/insufficient_balance_exception.dart';
import 'package:stackwallet/exceptions/wallet/paynym_send_exception.dart';
import 'package:stackwallet/models/isar/models/isar_models.dart';
import 'package:stackwallet/models/signing_data.dart';
import 'package:stackwallet/utilities/amount/amount.dart';
import 'package:stackwallet/utilities/bip32_utils.dart';
import 'package:stackwallet/utilities/bip47_utils.dart';
import 'package:stackwallet/utilities/enums/coin_enum.dart';
import 'package:stackwallet/utilities/flutter_secure_storage_interface.dart';
import 'package:stackwallet/utilities/format.dart';
import 'package:stackwallet/utilities/logger.dart';
import 'package:tuple/tuple.dart';
const String kPCodeKeyPrefix = "pCode_key_";
String _basePaynymDerivePath({required bool testnet}) =>
"m/47'/${testnet ? "1" : "0"}'/0'";
String _notificationDerivationPath({required bool testnet}) =>
"${_basePaynymDerivePath(testnet: testnet)}/0";
String _receivingPaynymAddressDerivationPath(
int index, {
required bool testnet,
}) =>
"${_basePaynymDerivePath(testnet: testnet)}/$index/0";
String _sendPaynymAddressDerivationPath(
int index, {
required bool testnet,
}) =>
"${_basePaynymDerivePath(testnet: testnet)}/0/$index";
mixin PaynymWalletInterface {
// passed in wallet data
late final String _walletId;
late final String _walletName;
late final btc_dart.NetworkType _network;
late final Coin _coin;
late final MainDB _db;
late final ElectrumX _electrumXClient;
late final SecureStorageInterface _secureStorage;
late final int _dustLimit;
late final int _dustLimitP2PKH;
late final int _minConfirms;
// passed in wallet functions
late final Future<String?> Function() _getMnemonicString;
late final Future<String?> Function() _getMnemonicPassphrase;
late final Future<int> Function() _getChainHeight;
late final Future<String> Function() _getCurrentChangeAddress;
late final int Function({
required int vSize,
required int feeRatePerKB,
}) _estimateTxFee;
late final Future<Map<String, dynamic>> Function({
required String address,
required Amount amount,
Map<String, dynamic>? args,
}) _prepareSend;
late final Future<int> Function({
required String address,
}) _getTxCount;
late final Future<List<SigningData>> Function(
List<UTXO> utxosToUse,
) _fetchBuildTxData;
late final Future<void> Function() _refresh;
late final Future<void> Function() _checkChangeAddressForTransactions;
// initializer
void initPaynymWalletInterface({
required String walletId,
required String walletName,
required btc_dart.NetworkType network,
required Coin coin,
required MainDB db,
required ElectrumX electrumXClient,
required SecureStorageInterface secureStorage,
required int dustLimit,
required int dustLimitP2PKH,
required int minConfirms,
required Future<String?> Function() getMnemonicString,
required Future<String?> Function() getMnemonicPassphrase,
required Future<int> Function() getChainHeight,
required Future<String> Function() getCurrentChangeAddress,
required int Function({
required int vSize,
required int feeRatePerKB,
})
estimateTxFee,
required Future<Map<String, dynamic>> Function({
required String address,
required Amount amount,
Map<String, dynamic>? args,
})
prepareSend,
required Future<int> Function({
required String address,
})
getTxCount,
required Future<List<SigningData>> Function(
List<UTXO> utxosToUse,
)
fetchBuildTxData,
required Future<void> Function() refresh,
required Future<void> Function() checkChangeAddressForTransactions,
}) {
_walletId = walletId;
_walletName = walletName;
_network = network;
_coin = coin;
_db = db;
_electrumXClient = electrumXClient;
_secureStorage = secureStorage;
_dustLimit = dustLimit;
_dustLimitP2PKH = dustLimitP2PKH;
_minConfirms = minConfirms;
_getMnemonicString = getMnemonicString;
_getMnemonicPassphrase = getMnemonicPassphrase;
_getChainHeight = getChainHeight;
_getCurrentChangeAddress = getCurrentChangeAddress;
_estimateTxFee = estimateTxFee;
_prepareSend = prepareSend;
_getTxCount = getTxCount;
_fetchBuildTxData = fetchBuildTxData;
_refresh = refresh;
_checkChangeAddressForTransactions = checkChangeAddressForTransactions;
}
// convenience getter
btc_dart.NetworkType get networkType => _network;
Future<bip32.BIP32> getBip47BaseNode() async {
final root = await _getRootNode();
final node = root.derivePath(
_basePaynymDerivePath(
testnet: _coin.isTestNet,
),
);
return node;
}
Future<Uint8List> getPrivateKeyForPaynymReceivingAddress({
required String paymentCodeString,
required int index,
}) async {
final bip47base = await getBip47BaseNode();
final paymentAddress = PaymentAddress(
bip32Node: bip47base.derive(index),
paymentCode: PaymentCode.fromPaymentCode(
paymentCodeString,
networkType: networkType,
),
networkType: networkType,
index: 0,
);
final pair = paymentAddress.getReceiveAddressKeyPair();
return pair.privateKey!;
}
Future<Address> currentReceivingPaynymAddress({
required PaymentCode sender,
required bool isSegwit,
}) async {
final keys = await lookupKey(sender.toString());
final address = await _db
.getAddresses(_walletId)
.filter()
.subTypeEqualTo(AddressSubType.paynymReceive)
.and()
.group((q) {
if (isSegwit) {
return q
.typeEqualTo(AddressType.p2sh)
.or()
.typeEqualTo(AddressType.p2wpkh);
} else {
return q.typeEqualTo(AddressType.p2pkh);
}
})
.and()
.anyOf<String, Address>(keys, (q, String e) => q.otherDataEqualTo(e))
.sortByDerivationIndexDesc()
.findFirst();
if (address == null) {
final generatedAddress = await _generatePaynymReceivingAddress(
sender: sender,
index: 0,
generateSegwitAddress: isSegwit,
);
final existing = await _db
.getAddresses(_walletId)
.filter()
.valueEqualTo(generatedAddress.value)
.findFirst();
if (existing == null) {
// Add that new address
await _db.putAddress(generatedAddress);
} else {
// we need to update the address
await _db.updateAddress(existing, generatedAddress);
}
return currentReceivingPaynymAddress(
isSegwit: isSegwit,
sender: sender,
);
} else {
return address;
}
}
Future<Address> _generatePaynymReceivingAddress({
required PaymentCode sender,
required int index,
required bool generateSegwitAddress,
}) async {
final root = await _getRootNode();
final node = root.derivePath(
_basePaynymDerivePath(
testnet: _coin.isTestNet,
),
);
final paymentAddress = PaymentAddress(
bip32Node: node.derive(index),
paymentCode: sender,
networkType: networkType,
index: 0,
);
final addressString = generateSegwitAddress
? paymentAddress.getReceiveAddressP2WPKH()
: paymentAddress.getReceiveAddressP2PKH();
final address = Address(
walletId: _walletId,
value: addressString,
publicKey: [],
derivationIndex: index,
derivationPath: DerivationPath()
..value = _receivingPaynymAddressDerivationPath(
index,
testnet: _coin.isTestNet,
),
type: generateSegwitAddress ? AddressType.p2wpkh : AddressType.p2pkh,
subType: AddressSubType.paynymReceive,
otherData: await storeCode(sender.toString()),
);
return address;
}
Future<Address> _generatePaynymSendAddress({
required PaymentCode other,
required int index,
required bool generateSegwitAddress,
bip32.BIP32? mySendBip32Node,
}) async {
final node = mySendBip32Node ?? await deriveNotificationBip32Node();
final paymentAddress = PaymentAddress(
bip32Node: node,
paymentCode: other,
networkType: networkType,
index: index,
);
final addressString = generateSegwitAddress
? paymentAddress.getSendAddressP2WPKH()
: paymentAddress.getSendAddressP2PKH();
final address = Address(
walletId: _walletId,
value: addressString,
publicKey: [],
derivationIndex: index,
derivationPath: DerivationPath()
..value = _sendPaynymAddressDerivationPath(
index,
testnet: _coin.isTestNet,
),
type: AddressType.nonWallet,
subType: AddressSubType.paynymSend,
otherData: await storeCode(other.toString()),
);
return address;
}
Future<void> checkCurrentPaynymReceivingAddressForTransactions({
required PaymentCode sender,
required bool isSegwit,
}) async {
final address = await currentReceivingPaynymAddress(
sender: sender,
isSegwit: isSegwit,
);
final txCount = await _getTxCount(address: address.value);
if (txCount > 0) {
// generate next address and add to db
final nextAddress = await _generatePaynymReceivingAddress(
sender: sender,
index: address.derivationIndex + 1,
generateSegwitAddress: isSegwit,
);
final existing = await _db
.getAddresses(_walletId)
.filter()
.valueEqualTo(nextAddress.value)
.findFirst();
if (existing == null) {
// Add that new address
await _db.putAddress(nextAddress);
} else {
// we need to update the address
await _db.updateAddress(existing, nextAddress);
}
// keep checking until address with no tx history is set as current
await checkCurrentPaynymReceivingAddressForTransactions(
sender: sender,
isSegwit: isSegwit,
);
}
}
Future<void> checkAllCurrentReceivingPaynymAddressesForTransactions() async {
final codes = await getAllPaymentCodesFromNotificationTransactions();
final List<Future<void>> futures = [];
for (final code in codes) {
futures.add(checkCurrentPaynymReceivingAddressForTransactions(
sender: code,
isSegwit: true,
));
futures.add(checkCurrentPaynymReceivingAddressForTransactions(
sender: code,
isSegwit: false,
));
}
await Future.wait(futures);
}
// generate bip32 payment code root
Future<bip32.BIP32> _getRootNode() async {
return _cachedRootNode ??= await Bip32Utils.getBip32Root(
(await _getMnemonicString())!,
(await _getMnemonicPassphrase())!,
_network,
);
}
bip32.BIP32? _cachedRootNode;
Future<bip32.BIP32> deriveNotificationBip32Node() async {
final root = await _getRootNode();
final node = root
.derivePath(
_basePaynymDerivePath(
testnet: _coin.isTestNet,
),
)
.derive(0);
return node;
}
/// fetch or generate this wallet's bip47 payment code
Future<PaymentCode> getPaymentCode({
required bool isSegwit,
}) async {
final node = await _getRootNode();
final paymentCode = PaymentCode.fromBip32Node(
node.derivePath(_basePaynymDerivePath(testnet: _coin.isTestNet)),
networkType: networkType,
shouldSetSegwitBit: isSegwit,
);
return paymentCode;
}
Future<Uint8List> signWithNotificationKey(Uint8List data) async {
final myPrivateKeyNode = await deriveNotificationBip32Node();
final pair = btc_dart.ECPair.fromPrivateKey(myPrivateKeyNode.privateKey!,
network: _network);
final signed = pair.sign(SHA256Digest().process(data));
return signed;
}
Future<String> signStringWithNotificationKey(String data) async {
final bytes =
await signWithNotificationKey(Uint8List.fromList(utf8.encode(data)));
return Format.uint8listToString(bytes);
}
Future<Map<String, dynamic>> preparePaymentCodeSend({
required PaymentCode paymentCode,
required bool isSegwit,
required Amount amount,
Map<String, dynamic>? args,
}) async {
if (!(await hasConnected(paymentCode.toString()))) {
throw PaynymSendException(
"No notification transaction sent to $paymentCode");
} else {
final myPrivateKeyNode = await deriveNotificationBip32Node();
final sendToAddress = await nextUnusedSendAddressFrom(
pCode: paymentCode,
privateKeyNode: myPrivateKeyNode,
isSegwit: isSegwit,
);
return _prepareSend(
address: sendToAddress.value,
amount: amount,
args: args,
);
}
}
/// get the next unused address to send to given the receiver's payment code
/// and your own private key
Future<Address> nextUnusedSendAddressFrom({
required PaymentCode pCode,
required bool isSegwit,
required bip32.BIP32 privateKeyNode,
int startIndex = 0,
}) async {
// https://en.bitcoin.it/wiki/BIP_0047#Path_levels
const maxCount = 2147483647;
for (int i = startIndex; i < maxCount; i++) {
final keys = await lookupKey(pCode.toString());
final address = await _db
.getAddresses(_walletId)
.filter()
.subTypeEqualTo(AddressSubType.paynymSend)
.and()
.anyOf<String, Address>(keys, (q, String e) => q.otherDataEqualTo(e))
.and()
.derivationIndexEqualTo(i)
.findFirst();
if (address != null) {
final count = await _getTxCount(address: address.value);
// return address if unused, otherwise continue to next index
if (count == 0) {
return address;
}
} else {
final address = await _generatePaynymSendAddress(
other: pCode,
index: i,
generateSegwitAddress: isSegwit,
mySendBip32Node: privateKeyNode,
);
final storedAddress = await _db.getAddress(_walletId, address.value);
if (storedAddress == null) {
await _db.putAddress(address);
} else {
await _db.updateAddress(storedAddress, address);
}
final count = await _getTxCount(address: address.value);
// return address if unused, otherwise continue to next index
if (count == 0) {
return address;
}
}
}
throw PaynymSendException("Exhausted unused send addresses!");
}
Future<Map<String, dynamic>> prepareNotificationTx({
required int selectedTxFeeRate,
required String targetPaymentCodeString,
int additionalOutputs = 0,
List<UTXO>? utxos,
}) async {
try {
final amountToSend = _dustLimitP2PKH;
final List<UTXO> availableOutputs =
utxos ?? await _db.getUTXOs(_walletId).findAll();
final List<UTXO> spendableOutputs = [];
int spendableSatoshiValue = 0;
// Build list of spendable outputs and totaling their satoshi amount
for (var i = 0; i < availableOutputs.length; i++) {
if (availableOutputs[i].isBlocked == false &&
availableOutputs[i]
.isConfirmed(await _getChainHeight(), _minConfirms) ==
true) {
spendableOutputs.add(availableOutputs[i]);
spendableSatoshiValue += availableOutputs[i].value;
}
}
if (spendableSatoshiValue < amountToSend) {
// insufficient balance
throw InsufficientBalanceException(
"Spendable balance is less than the minimum required for a notification transaction.");
} else if (spendableSatoshiValue == amountToSend) {
// insufficient balance due to missing amount to cover fee
throw InsufficientBalanceException(
"Remaining balance does not cover the network fee.");
}
// sort spendable by age (oldest first)
spendableOutputs.sort((a, b) => b.blockTime!.compareTo(a.blockTime!));
int satoshisBeingUsed = 0;
int outputsBeingUsed = 0;
List<UTXO> utxoObjectsToUse = [];
for (int i = 0;
satoshisBeingUsed < amountToSend && i < spendableOutputs.length;
i++) {
utxoObjectsToUse.add(spendableOutputs[i]);
satoshisBeingUsed += spendableOutputs[i].value;
outputsBeingUsed += 1;
}
// add additional outputs if required
for (int i = 0;
i < additionalOutputs && outputsBeingUsed < spendableOutputs.length;
i++) {
utxoObjectsToUse.add(spendableOutputs[outputsBeingUsed]);
satoshisBeingUsed += spendableOutputs[outputsBeingUsed].value;
outputsBeingUsed += 1;
}
// gather required signing data
final utxoSigningData = await _fetchBuildTxData(utxoObjectsToUse);
final int vSizeForNoChange = (await _createNotificationTx(
targetPaymentCodeString: targetPaymentCodeString,
utxoSigningData: utxoSigningData,
change: 0,
// override amount to get around absurd fees error
overrideAmountForTesting: satoshisBeingUsed,
))
.item2;
final int vSizeForWithChange = (await _createNotificationTx(
targetPaymentCodeString: targetPaymentCodeString,
utxoSigningData: utxoSigningData,
change: satoshisBeingUsed - amountToSend,
))
.item2;
// Assume 2 outputs, for recipient and payment code script
int feeForNoChange = _estimateTxFee(
vSize: vSizeForNoChange,
feeRatePerKB: selectedTxFeeRate,
);
// Assume 3 outputs, for recipient, payment code script, and change
int feeForWithChange = _estimateTxFee(
vSize: vSizeForWithChange,
feeRatePerKB: selectedTxFeeRate,
);
if (_coin == Coin.dogecoin || _coin == Coin.dogecoinTestNet) {
if (feeForNoChange < vSizeForNoChange * 1000) {
feeForNoChange = vSizeForNoChange * 1000;
}
if (feeForWithChange < vSizeForWithChange * 1000) {
feeForWithChange = vSizeForWithChange * 1000;
}
}
if (satoshisBeingUsed - amountToSend > feeForNoChange + _dustLimitP2PKH) {
// try to add change output due to "left over" amount being greater than
// the estimated fee + the dust limit
int changeAmount = satoshisBeingUsed - amountToSend - feeForWithChange;
// check estimates are correct and build notification tx
if (changeAmount >= _dustLimitP2PKH &&
satoshisBeingUsed - amountToSend - changeAmount ==
feeForWithChange) {
var txn = await _createNotificationTx(
targetPaymentCodeString: targetPaymentCodeString,
utxoSigningData: utxoSigningData,
change: changeAmount,
);
int feeBeingPaid = satoshisBeingUsed - amountToSend - changeAmount;
// make sure minimum fee is accurate if that is being used
if (txn.item2 - feeBeingPaid == 1) {
changeAmount -= 1;
feeBeingPaid += 1;
txn = await _createNotificationTx(
targetPaymentCodeString: targetPaymentCodeString,
utxoSigningData: utxoSigningData,
change: changeAmount,
);
}
Map<String, dynamic> transactionObject = {
"hex": txn.item1,
"recipientPaynym": targetPaymentCodeString,
"amount": amountToSend.toAmountAsRaw(
fractionDigits: _coin.decimals,
),
"fee": feeBeingPaid,
"vSize": txn.item2,
"usedUTXOs": utxoSigningData.map((e) => e.utxo).toList(),
};
return transactionObject;
} else {
// something broke during fee estimation or the change amount is smaller
// than the dust limit. Try without change
final txn = await _createNotificationTx(
targetPaymentCodeString: targetPaymentCodeString,
utxoSigningData: utxoSigningData,
change: 0,
);
int feeBeingPaid = satoshisBeingUsed - amountToSend;
Map<String, dynamic> transactionObject = {
"hex": txn.item1,
"recipientPaynym": targetPaymentCodeString,
"amount":
amountToSend.toAmountAsRaw(fractionDigits: _coin.decimals),
"fee": feeBeingPaid,
"vSize": txn.item2,
"usedUTXOs": utxoSigningData.map((e) => e.utxo).toList(),
};
return transactionObject;
}
} else if (satoshisBeingUsed - amountToSend >= feeForNoChange) {
// since we already checked if we need to add a change output we can just
// build without change here
final txn = await _createNotificationTx(
targetPaymentCodeString: targetPaymentCodeString,
utxoSigningData: utxoSigningData,
change: 0,
);
int feeBeingPaid = satoshisBeingUsed - amountToSend;
Map<String, dynamic> transactionObject = {
"hex": txn.item1,
"recipientPaynym": targetPaymentCodeString,
"amount": amountToSend.toAmountAsRaw(fractionDigits: _coin.decimals),
"fee": feeBeingPaid,
"vSize": txn.item2,
"usedUTXOs": utxoSigningData.map((e) => e.utxo).toList(),
};
return transactionObject;
} else {
// if we get here we do not have enough funds to cover the tx total so we
// check if we have any more available outputs and try again
if (spendableOutputs.length > outputsBeingUsed) {
return prepareNotificationTx(
selectedTxFeeRate: selectedTxFeeRate,
targetPaymentCodeString: targetPaymentCodeString,
additionalOutputs: additionalOutputs + 1,
);
} else {
throw InsufficientBalanceException(
"Remaining balance does not cover the network fee.");
}
}
} catch (e) {
rethrow;
}
}
// return tuple with string value equal to the raw tx hex and the int value
// equal to its vSize
Future<Tuple2<String, int>> _createNotificationTx({
required String targetPaymentCodeString,
required List<SigningData> utxoSigningData,
required int change,
int? overrideAmountForTesting,
}) async {
try {
final targetPaymentCode = PaymentCode.fromPaymentCode(
targetPaymentCodeString,
networkType: _network,
);
final myCode = await getPaymentCode(isSegwit: false);
final utxo = utxoSigningData.first.utxo;
final txPoint = utxo.txid.fromHex.reversed.toList();
final txPointIndex = utxo.vout;
final rev = Uint8List(txPoint.length + 4);
Util.copyBytes(Uint8List.fromList(txPoint), 0, rev, 0, txPoint.length);
final buffer = rev.buffer.asByteData();
buffer.setUint32(txPoint.length, txPointIndex, Endian.little);
final myKeyPair = utxoSigningData.first.keyPair!;
final S = SecretPoint(
myKeyPair.privateKey!,
targetPaymentCode.notificationPublicKey(),
);
final blindingMask = PaymentCode.getMask(S.ecdhSecret(), rev);
final blindedPaymentCode = PaymentCode.blind(
payload: myCode.getPayload(),
mask: blindingMask,
unBlind: false,
);
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,
null,
utxoSigningData.first.output!,
);
// add rest of possible inputs
for (var i = 1; i < utxoSigningData.length; i++) {
final utxo = utxoSigningData[i].utxo;
txb.addInput(
utxo.txid,
utxo.vout,
null,
utxoSigningData[i].output!,
);
}
final String notificationAddress =
targetPaymentCode.notificationAddressP2PKH();
txb.addOutput(
notificationAddress,
overrideAmountForTesting ?? _dustLimitP2PKH,
);
txb.addOutput(opReturnScript, 0);
// TODO: add possible change output and mark output as dangerous
if (change > 0) {
// generate new change address if current change address has been used
await _checkChangeAddressForTransactions();
final String changeAddress = await _getCurrentChangeAddress();
txb.addOutput(changeAddress, change);
}
txb.sign(
vin: 0,
keyPair: myKeyPair,
witnessValue: utxo.value,
witnessScript: utxoSigningData.first.redeemScript,
);
// sign rest of possible inputs
for (var i = 1; i < utxoSigningData.length; i++) {
txb.sign(
vin: i,
keyPair: utxoSigningData[i].keyPair!,
witnessValue: utxoSigningData[i].utxo.value,
witnessScript: utxoSigningData[i].redeemScript,
);
}
final builtTx = txb.build();
return Tuple2(builtTx.toHex(), builtTx.virtualSize());
} catch (e, s) {
Logging.instance.log(
"_createNotificationTx(): $e\n$s",
level: LogLevel.Error,
);
rethrow;
}
}
Future<String> broadcastNotificationTx({
required Map<String, dynamic> preparedTx,
}) 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: $txHash", level: LogLevel.Info);
// TODO: only refresh transaction data
try {
await _refresh();
} catch (e) {
Logging.instance.log(
"refresh() failed in confirmNotificationTx ($_walletName::$_walletId): $e",
level: LogLevel.Error,
);
}
return txHash;
} catch (e, s) {
Logging.instance.log("Exception rethrown from confirmSend(): $e\n$s",
level: LogLevel.Error);
rethrow;
}
}
// Future<bool?> _checkHasConnectedCache(String paymentCodeString) async {
// final value = await _secureStorage.read(
// key: "$_connectedKeyPrefix$paymentCodeString");
// if (value == null) {
// return null;
// } else {
// final int rawBool = int.parse(value);
// return rawBool > 0;
// }
// }
//
// Future<void> _setConnectedCache(
// String paymentCodeString, bool hasConnected) async {
// await _secureStorage.write(
// key: "$_connectedKeyPrefix$paymentCodeString",
// value: hasConnected ? "1" : "0");
// }
// TODO optimize
Future<bool> hasConnected(String paymentCodeString) async {
// final didConnect = await _checkHasConnectedCache(paymentCodeString);
// if (didConnect == true) {
// return true;
// }
//
// final keys = await lookupKey(paymentCodeString);
//
// final tx = await _db
// .getTransactions(_walletId)
// .filter()
// .subTypeEqualTo(TransactionSubType.bip47Notification).and()
// .address((q) =>
// q.anyOf<String, Transaction>(keys, (q, e) => q.otherDataEqualTo(e)))
// .findAll();
final myNotificationAddress = await getMyNotificationAddress();
final txns = await _db
.getTransactions(_walletId)
.filter()
.subTypeEqualTo(TransactionSubType.bip47Notification)
.findAll();
for (final tx in txns) {
if (tx.type == TransactionType.incoming &&
tx.address.value?.value == myNotificationAddress.value) {
final unBlindedPaymentCode = await unBlindedPaymentCodeFromTransaction(
transaction: tx,
);
if (unBlindedPaymentCode != null &&
paymentCodeString == unBlindedPaymentCode.toString()) {
// await _setConnectedCache(paymentCodeString, true);
return true;
}
final unBlindedPaymentCodeBad =
await unBlindedPaymentCodeFromTransactionBad(
transaction: tx,
);
if (unBlindedPaymentCodeBad != null &&
paymentCodeString == unBlindedPaymentCodeBad.toString()) {
// await _setConnectedCache(paymentCodeString, true);
return true;
}
} else if (tx.type == TransactionType.outgoing) {
if (tx.address.value?.otherData != null) {
final code =
await paymentCodeStringByKey(tx.address.value!.otherData!);
if (code == paymentCodeString) {
// await _setConnectedCache(paymentCodeString, true);
return true;
}
}
}
}
// otherwise return no
// await _setConnectedCache(paymentCodeString, false);
return false;
}
Uint8List? _pubKeyFromInput(Input input) {
final scriptSigComponents = input.scriptSigAsm?.split(" ") ?? [];
if (scriptSigComponents.length > 1) {
return scriptSigComponents[1].fromHex;
}
if (input.witness != null) {
try {
final witnessComponents = jsonDecode(input.witness!) as List;
if (witnessComponents.length == 2) {
return (witnessComponents[1] as String).fromHex;
}
} catch (_) {
//
}
}
return null;
}
Future<PaymentCode?> unBlindedPaymentCodeFromTransaction({
required Transaction transaction,
}) async {
try {
final blindedCodeBytes =
Bip47Utils.getBlindedPaymentCodeBytesFrom(transaction);
// transaction does not contain a payment code
if (blindedCodeBytes == null) {
return null;
}
final designatedInput = transaction.inputs.first;
final txPoint = designatedInput.txid.fromHex.reversed.toList();
final txPointIndex = designatedInput.vout;
final rev = Uint8List(txPoint.length + 4);
Util.copyBytes(Uint8List.fromList(txPoint), 0, rev, 0, txPoint.length);
final buffer = rev.buffer.asByteData();
buffer.setUint32(txPoint.length, txPointIndex, Endian.little);
final pubKey = _pubKeyFromInput(designatedInput)!;
final myPrivateKey = (await deriveNotificationBip32Node()).privateKey!;
final S = SecretPoint(myPrivateKey, pubKey);
final mask = PaymentCode.getMask(S.ecdhSecret(), rev);
final unBlindedPayload = PaymentCode.blind(
payload: blindedCodeBytes,
mask: mask,
unBlind: true,
);
final unBlindedPaymentCode = PaymentCode.fromPayload(
unBlindedPayload,
networkType: _network,
);
return unBlindedPaymentCode;
} catch (e) {
Logging.instance.log(
"unBlindedPaymentCodeFromTransaction() failed: $e\nFor tx: $transaction",
level: LogLevel.Warning,
);
return null;
}
}
Future<PaymentCode?> unBlindedPaymentCodeFromTransactionBad({
required Transaction transaction,
}) async {
try {
final blindedCodeBytes =
Bip47Utils.getBlindedPaymentCodeBytesFrom(transaction);
// transaction does not contain a payment code
if (blindedCodeBytes == null) {
return null;
}
final designatedInput = transaction.inputs.first;
final txPoint = designatedInput.txid.fromHex.toList();
final txPointIndex = designatedInput.vout;
final rev = Uint8List(txPoint.length + 4);
Util.copyBytes(Uint8List.fromList(txPoint), 0, rev, 0, txPoint.length);
final buffer = rev.buffer.asByteData();
buffer.setUint32(txPoint.length, txPointIndex, Endian.little);
final pubKey = _pubKeyFromInput(designatedInput)!;
final myPrivateKey = (await deriveNotificationBip32Node()).privateKey!;
final S = SecretPoint(myPrivateKey, pubKey);
final mask = PaymentCode.getMask(S.ecdhSecret(), rev);
final unBlindedPayload = PaymentCode.blind(
payload: blindedCodeBytes,
mask: mask,
unBlind: true,
);
final unBlindedPaymentCode = PaymentCode.fromPayload(
unBlindedPayload,
networkType: _network,
);
return unBlindedPaymentCode;
} catch (e) {
Logging.instance.log(
"unBlindedPaymentCodeFromTransactionBad() failed: $e\nFor tx: $transaction",
level: LogLevel.Warning,
);
return null;
}
}
Future<List<PaymentCode>>
getAllPaymentCodesFromNotificationTransactions() async {
final txns = await _db
.getTransactions(_walletId)
.filter()
.subTypeEqualTo(TransactionSubType.bip47Notification)
.findAll();
List<PaymentCode> codes = [];
for (final tx in txns) {
// tx is sent so we can check the address's otherData for the code String
if (tx.type == TransactionType.outgoing &&
tx.address.value?.otherData != null) {
final codeString =
await paymentCodeStringByKey(tx.address.value!.otherData!);
if (codeString != null &&
codes.where((e) => e.toString() == codeString).isEmpty) {
codes.add(
PaymentCode.fromPaymentCode(
codeString,
networkType: _network,
),
);
}
} else {
// otherwise we need to un blind the code
final unBlinded = await unBlindedPaymentCodeFromTransaction(
transaction: tx,
);
if (unBlinded != null &&
codes.where((e) => e.toString() == unBlinded.toString()).isEmpty) {
codes.add(unBlinded);
}
final unBlindedBad = await unBlindedPaymentCodeFromTransactionBad(
transaction: tx,
);
if (unBlindedBad != null &&
codes
.where((e) => e.toString() == unBlindedBad.toString())
.isEmpty) {
codes.add(unBlindedBad);
}
}
}
return codes;
}
Future<void> checkForNotificationTransactionsTo(
Set<String> otherCodeStrings) async {
final sentNotificationTransactions = await _db
.getTransactions(_walletId)
.filter()
.subTypeEqualTo(TransactionSubType.bip47Notification)
.and()
.typeEqualTo(TransactionType.outgoing)
.findAll();
final List<PaymentCode> codes = [];
for (final codeString in otherCodeStrings) {
codes.add(PaymentCode.fromPaymentCode(codeString, networkType: _network));
}
for (final tx in sentNotificationTransactions) {
if (tx.address.value != null && tx.address.value!.otherData == null) {
final oldAddress =
await _db.getAddress(_walletId, tx.address.value!.value);
for (final code in codes) {
final notificationAddress = code.notificationAddressP2PKH();
if (notificationAddress == oldAddress!.value) {
final address = Address(
walletId: _walletId,
value: notificationAddress,
publicKey: [],
derivationIndex: 0,
derivationPath: oldAddress.derivationPath,
type: oldAddress.type,
subType: AddressSubType.paynymNotification,
otherData: await storeCode(code.toString()),
);
await _db.updateAddress(oldAddress, address);
}
}
}
}
}
Future<void> restoreAllHistory({
required int maxUnusedAddressGap,
required int maxNumberOfIndexesToCheck,
required Set<String> paymentCodeStrings,
}) async {
final codes = await getAllPaymentCodesFromNotificationTransactions();
final List<PaymentCode> extraCodes = [];
for (final codeString in paymentCodeStrings) {
if (codes.where((e) => e.toString() == codeString).isEmpty) {
final extraCode = PaymentCode.fromPaymentCode(
codeString,
networkType: _network,
);
if (extraCode.isValid()) {
extraCodes.add(extraCode);
}
}
}
codes.addAll(extraCodes);
final List<Future<void>> futures = [];
for (final code in codes) {
futures.add(
restoreHistoryWith(
other: code,
maxUnusedAddressGap: maxUnusedAddressGap,
maxNumberOfIndexesToCheck: maxNumberOfIndexesToCheck,
checkSegwitAsWell: code.isSegWitEnabled(),
),
);
}
await Future.wait(futures);
}
Future<void> restoreHistoryWith({
required PaymentCode other,
required bool checkSegwitAsWell,
required int maxUnusedAddressGap,
required int maxNumberOfIndexesToCheck,
}) async {
// https://en.bitcoin.it/wiki/BIP_0047#Path_levels
const maxCount = 2147483647;
assert(maxNumberOfIndexesToCheck < maxCount);
final mySendBip32Node = await deriveNotificationBip32Node();
List<Address> addresses = [];
int receivingGapCounter = 0;
int outgoingGapCounter = 0;
// non segwit receiving
for (int i = 0;
i < maxNumberOfIndexesToCheck &&
receivingGapCounter < maxUnusedAddressGap;
i++) {
if (receivingGapCounter < maxUnusedAddressGap) {
final address = await _generatePaynymReceivingAddress(
sender: other,
index: i,
generateSegwitAddress: false,
);
addresses.add(address);
final count = await _getTxCount(address: address.value);
if (count > 0) {
receivingGapCounter = 0;
} else {
receivingGapCounter++;
}
}
}
// non segwit sends
for (int i = 0;
i < maxNumberOfIndexesToCheck &&
outgoingGapCounter < maxUnusedAddressGap;
i++) {
if (outgoingGapCounter < maxUnusedAddressGap) {
final address = await _generatePaynymSendAddress(
other: other,
index: i,
generateSegwitAddress: false,
mySendBip32Node: mySendBip32Node,
);
addresses.add(address);
final count = await _getTxCount(address: address.value);
if (count > 0) {
outgoingGapCounter = 0;
} else {
outgoingGapCounter++;
}
}
}
if (checkSegwitAsWell) {
int receivingGapCounterSegwit = 0;
int outgoingGapCounterSegwit = 0;
// segwit receiving
for (int i = 0;
i < maxNumberOfIndexesToCheck &&
receivingGapCounterSegwit < maxUnusedAddressGap;
i++) {
if (receivingGapCounterSegwit < maxUnusedAddressGap) {
final address = await _generatePaynymReceivingAddress(
sender: other,
index: i,
generateSegwitAddress: true,
);
addresses.add(address);
final count = await _getTxCount(address: address.value);
if (count > 0) {
receivingGapCounterSegwit = 0;
} else {
receivingGapCounterSegwit++;
}
}
}
// segwit sends
for (int i = 0;
i < maxNumberOfIndexesToCheck &&
outgoingGapCounterSegwit < maxUnusedAddressGap;
i++) {
if (outgoingGapCounterSegwit < maxUnusedAddressGap) {
final address = await _generatePaynymSendAddress(
other: other,
index: i,
generateSegwitAddress: true,
mySendBip32Node: mySendBip32Node,
);
addresses.add(address);
final count = await _getTxCount(address: address.value);
if (count > 0) {
outgoingGapCounterSegwit = 0;
} else {
outgoingGapCounterSegwit++;
}
}
}
}
await _db.updateOrPutAddresses(addresses);
}
Future<Address> getMyNotificationAddress() async {
final storedAddress = await _db
.getAddresses(_walletId)
.filter()
.subTypeEqualTo(AddressSubType.paynymNotification)
.and()
.typeEqualTo(AddressType.p2pkh)
.and()
.not()
.typeEqualTo(AddressType.nonWallet)
.findFirst();
if (storedAddress != null) {
return storedAddress;
} else {
final root = await _getRootNode();
final node = root.derivePath(
_basePaynymDerivePath(
testnet: _coin.isTestNet,
),
);
final paymentCode = PaymentCode.fromBip32Node(
node,
networkType: _network,
shouldSetSegwitBit: false,
);
final data = btc_dart.PaymentData(
pubkey: paymentCode.notificationPublicKey(),
);
final addressString = btc_dart
.P2PKH(
data: data,
network: _network,
)
.data
.address!;
Address address = Address(
walletId: _walletId,
value: addressString,
publicKey: paymentCode.getPubKey(),
derivationIndex: 0,
derivationPath: DerivationPath()
..value = _notificationDerivationPath(
testnet: _coin.isTestNet,
),
type: AddressType.p2pkh,
subType: AddressSubType.paynymNotification,
otherData: await storeCode(paymentCode.toString()),
);
// check against possible race condition. Ff this function was called
// multiple times an address could've been saved after the check at the
// beginning to see if there already was notification address. This would
// lead to a Unique Index violation error
await _db.isar.writeTxn(() async {
final storedAddress = await _db
.getAddresses(_walletId)
.filter()
.subTypeEqualTo(AddressSubType.paynymNotification)
.and()
.typeEqualTo(AddressType.p2pkh)
.and()
.not()
.typeEqualTo(AddressType.nonWallet)
.findFirst();
if (storedAddress == null) {
await _db.isar.addresses.put(address);
} else {
address = storedAddress;
}
});
return address;
}
}
/// look up a key that corresponds to a payment code string
Future<List<String>> lookupKey(String paymentCodeString) async {
final keys =
(await _secureStorage.keys).where((e) => e.startsWith(kPCodeKeyPrefix));
final List<String> result = [];
for (final key in keys) {
final value = await _secureStorage.read(key: key);
if (value == paymentCodeString) {
result.add(key);
}
}
return result;
}
/// fetch a payment code string
Future<String?> paymentCodeStringByKey(String key) async {
final value = await _secureStorage.read(key: key);
return value;
}
/// store payment code string and return the generated key used
Future<String> storeCode(String paymentCodeString) async {
final key = _generateKey();
await _secureStorage.write(key: key, value: paymentCodeString);
return key;
}
/// generate a new payment code string storage key
String _generateKey() {
final bytes = _randomBytes(24);
return "$kPCodeKeyPrefix${bytes.toHex}";
}
// https://github.com/AaronFeickert/stack_wallet_backup/blob/master/lib/secure_storage.dart#L307-L311
/// Generate cryptographically-secure random bytes
Uint8List _randomBytes(int n) {
final Random rng = Random.secure();
return Uint8List.fromList(
List<int>.generate(n, (_) => rng.nextInt(0xFF + 1)));
}
}