public async Task <IActionResult> WalletRescan(
[ModelBinder(typeof(WalletIdModelBinder))]
WalletId walletId, RescanWalletModel vm)
{
if (walletId?.StoreId == null)
{
return(NotFound());
}
DerivationSchemeSettings paymentMethod = GetDerivationSchemeSettings(walletId);
if (paymentMethod == null)
{
return(NotFound());
}
var explorer = ExplorerClientProvider.GetExplorerClient(walletId.CryptoCode);
try
{
await explorer.ScanUTXOSetAsync(paymentMethod.AccountDerivation, vm.BatchSize, vm.GapLimit, vm.StartingIndex);
}
catch (NBXplorerException ex) when(ex.Error.Code == "scanutxoset-in-progress")
{
}
return(RedirectToAction());
}
public async Task <CreatePSBTResponse> CreatePSBT(BTCPayNetwork network, DerivationSchemeSettings derivationSettings, WalletSendModel sendModel, CancellationToken cancellationToken)
{
var nbx = ExplorerClientProvider.GetExplorerClient(network);
CreatePSBTRequest psbtRequest = new CreatePSBTRequest();
foreach (var transactionOutput in sendModel.Outputs)
{
var psbtDestination = new CreatePSBTDestination();
psbtRequest.Destinations.Add(psbtDestination);
psbtDestination.Destination = BitcoinAddress.Create(transactionOutput.DestinationAddress, network.NBitcoinNetwork);
psbtDestination.Amount = Money.Coins(transactionOutput.Amount.Value);
psbtDestination.SubstractFees = transactionOutput.SubtractFeesFromOutput;
}
if (network.SupportRBF)
{
psbtRequest.RBF = !sendModel.DisableRBF;
}
psbtRequest.FeePreference = new FeePreference();
psbtRequest.FeePreference.ExplicitFeeRate = new FeeRate(Money.Satoshis(sendModel.FeeSatoshiPerByte), 1);
if (sendModel.NoChange)
{
psbtRequest.ExplicitChangeAddress = psbtRequest.Destinations.First().Destination;
}
var psbt = (await nbx.CreatePSBTAsync(derivationSettings.AccountDerivation, psbtRequest, cancellationToken));
if (psbt == null)
{
throw new NotSupportedException("Necesitas actualizar tu versión de NBXplorer");
}
return(psbt);
}
private IActionResult ConfirmAddresses(WalletSetupViewModel vm, DerivationSchemeSettings strategy)
{
vm.DerivationScheme = strategy.AccountDerivation.ToString();
var deposit = new KeyPathTemplates(null).GetKeyPathTemplate(DerivationFeature.Deposit);
if (!string.IsNullOrEmpty(vm.DerivationScheme))
{
var line = strategy.AccountDerivation.GetLineFor(deposit);
for (uint i = 0; i < 10; i++)
{
var keyPath = deposit.GetKeyPath(i);
var rootedKeyPath = vm.GetAccountKeypath()?.Derive(keyPath);
var derivation = line.Derive(i);
var address = strategy.Network.NBXplorerNetwork.CreateAddress(strategy.AccountDerivation,
line.KeyPathTemplate.GetKeyPath(i),
derivation.ScriptPubKey).ToString();
vm.AddressSamples.Add((keyPath.ToString(), address, rootedKeyPath));
}
}
vm.Confirmation = true;
ModelState.Remove(nameof(vm.Config)); // Remove the cached value
return(View("ImportWallet/ConfirmAddresses", vm));
}
public async Task <IActionResult> WalletTransactions(
[ModelBinder(typeof(WalletIdModelBinder))]
WalletId walletId)
{
var store = await Repository.FindStore(walletId.StoreId, GetUserId());
DerivationSchemeSettings paymentMethod = GetPaymentMethod(walletId, store);
if (paymentMethod == null)
{
return(NotFound());
}
var wallet = _walletProvider.GetWallet(paymentMethod.Network);
var transactions = await wallet.FetchTransactions(paymentMethod.AccountDerivation);
var model = new ListTransactionsViewModel();
foreach (var tx in transactions.UnconfirmedTransactions.Transactions.Concat(transactions.ConfirmedTransactions.Transactions))
{
var vm = new ListTransactionsViewModel.TransactionViewModel();
model.Transactions.Add(vm);
vm.Id = tx.TransactionId.ToString();
vm.Link = string.Format(CultureInfo.InvariantCulture, paymentMethod.Network.BlockExplorerLink, vm.Id);
vm.Timestamp = tx.Timestamp;
vm.Positive = tx.BalanceChange >= Money.Zero;
vm.Balance = tx.BalanceChange.ToString();
vm.IsConfirmed = tx.Confirmations != 0;
}
model.Transactions = model.Transactions.OrderByDescending(t => t.Timestamp).ToList();
return(View(model));
}
public async Task <CreatePSBTResponse> CreatePSBT(BTCPayNetwork network, DerivationSchemeSettings derivationSettings, WalletSendModel sendModel, CancellationToken cancellationToken)
{
var nbx = ExplorerClientProvider.GetExplorerClient(network);
CreatePSBTRequest psbtRequest = new CreatePSBTRequest();
CreatePSBTDestination psbtDestination = new CreatePSBTDestination();
psbtRequest.Destinations.Add(psbtDestination);
if (network.SupportRBF)
{
psbtRequest.RBF = !sendModel.DisableRBF;
}
psbtDestination.Destination = BitcoinAddress.Create(sendModel.Destination, network.NBitcoinNetwork);
psbtDestination.Amount = Money.Coins(sendModel.Amount.Value);
psbtRequest.FeePreference = new FeePreference();
psbtRequest.FeePreference.ExplicitFeeRate = new FeeRate(Money.Satoshis(sendModel.FeeSatoshiPerByte), 1);
if (sendModel.NoChange)
{
psbtRequest.ExplicitChangeAddress = psbtDestination.Destination;
}
psbtDestination.SubstractFees = sendModel.SubstractFees;
var psbt = (await nbx.CreatePSBTAsync(derivationSettings.AccountDerivation, psbtRequest, cancellationToken));
if (psbt == null)
{
throw new NotSupportedException("You need to update your version of NBXplorer");
}
return(psbt);
}
private async Task <CreatePSBTResponse> CreatePSBT(BTCPayNetwork network, DerivationSchemeSettings derivationSettings, WalletSendLedgerModel sendModel, CancellationToken cancellationToken)
{
var nbx = ExplorerClientProvider.GetExplorerClient(network);
CreatePSBTRequest psbtRequest = new CreatePSBTRequest();
CreatePSBTDestination psbtDestination = new CreatePSBTDestination();
psbtRequest.Destinations.Add(psbtDestination);
if (network.SupportRBF)
{
psbtRequest.RBF = !sendModel.DisableRBF;
}
psbtDestination.Destination = BitcoinAddress.Create(sendModel.Destination, network.NBitcoinNetwork);
psbtDestination.Amount = Money.Coins(sendModel.Amount);
psbtRequest.FeePreference = new FeePreference();
psbtRequest.FeePreference.ExplicitFeeRate = new FeeRate(Money.Satoshis(sendModel.FeeSatoshiPerByte), 1);
if (sendModel.NoChange)
{
psbtRequest.ExplicitChangeAddress = psbtDestination.Destination;
}
psbtDestination.SubstractFees = sendModel.SubstractFees;
var psbt = (await nbx.CreatePSBTAsync(derivationSettings.AccountDerivation, psbtRequest, cancellationToken));
if (psbt == null)
{
throw new NotSupportedException("You need to update your version of NBXplorer");
}
if (network.MinFee != null)
{
psbt.PSBT.TryGetFee(out var fee);
if (fee < network.MinFee)
{
psbtRequest.FeePreference = new FeePreference()
{
ExplicitFee = network.MinFee
};
psbt = (await nbx.CreatePSBTAsync(derivationSettings.AccountDerivation, psbtRequest, cancellationToken));
}
}
if (derivationSettings.AccountKeyPath != null && derivationSettings.AccountKeyPath.Indexes.Length != 0)
{
// NBX only know the path relative to the account xpub.
// Here we rebase the hd_keys in the PSBT to have a keypath relative to the root HD so the wallet can sign
// Note that the fingerprint of the hd keys are now 0, which is wrong
// However, hardware wallets does not give a damn, and sometimes does not even allow us to get this fingerprint anyway.
foreach (var o in psbt.PSBT.Inputs.OfType <PSBTCoin>().Concat(psbt.PSBT.Outputs))
{
var rootFP = derivationSettings.RootFingerprint is HDFingerprint fp ? fp : default;
foreach (var keypath in o.HDKeyPaths.ToList())
{
var newKeyPath = derivationSettings.AccountKeyPath.Derive(keypath.Value.Item2);
o.HDKeyPaths.Remove(keypath.Key);
o.HDKeyPaths.Add(keypath.Key, Tuple.Create(rootFP, newKeyPath));
}
}
}
return(psbt);
}
public async Task <IActionResult> UpdateOnChainPaymentMethod(
string storeId,
string cryptoCode,
[FromBody] UpdateOnChainPaymentMethodRequest request)
{
var id = new PaymentMethodId(cryptoCode, PaymentTypes.BTCLike);
if (!GetCryptoCodeWallet(cryptoCode, out var network, out var wallet))
{
return(NotFound());
}
if (string.IsNullOrEmpty(request?.DerivationScheme))
{
ModelState.AddModelError(nameof(OnChainPaymentMethodData.DerivationScheme),
"Missing derivationScheme");
}
if (!ModelState.IsValid)
{
return(this.CreateValidationError(ModelState));
}
try
{
var store = Store;
var storeBlob = store.GetStoreBlob();
var strategy = DerivationSchemeSettings.Parse(request.DerivationScheme, network);
if (strategy != null)
{
await wallet.TrackAsync(strategy.AccountDerivation);
}
strategy.Label = request.Label;
var signing = strategy.GetSigningAccountKeySettings();
if (request.AccountKeyPath is RootedKeyPath r)
{
signing.AccountKeyPath = r.KeyPath;
signing.RootFingerprint = r.MasterFingerprint;
}
else
{
signing.AccountKeyPath = null;
signing.RootFingerprint = null;
}
store.SetSupportedPaymentMethod(id, strategy);
storeBlob.SetExcluded(id, !request.Enabled);
store.SetStoreBlob(storeBlob);
await _storeRepository.UpdateStore(store);
return(Ok(GetExistingBtcLikePaymentMethod(cryptoCode, store)));
}
catch
{
ModelState.AddModelError(nameof(OnChainPaymentMethodData.DerivationScheme),
"Invalid Derivation Scheme");
return(this.CreateValidationError(ModelState));
}
}
public IActionResult GetProposedOnChainPaymentMethodPreview(
string storeId,
string cryptoCode,
[FromBody] OnChainPaymentMethodDataPreview paymentMethodData,
int offset = 0, int amount = 10)
{
if (!GetCryptoCodeWallet(cryptoCode, out var network, out BTCPayWallet _))
{
return(NotFound());
}
if (string.IsNullOrEmpty(paymentMethodData?.DerivationScheme))
{
ModelState.AddModelError(nameof(OnChainPaymentMethodData.DerivationScheme),
"Missing derivationScheme");
}
if (!ModelState.IsValid)
{
return(this.CreateValidationError(ModelState));
}
DerivationSchemeSettings strategy;
try
{
strategy = DerivationSchemeSettings.Parse(paymentMethodData.DerivationScheme, network);
}
catch
{
ModelState.AddModelError(nameof(OnChainPaymentMethodData.DerivationScheme),
"Invalid Derivation Scheme");
return(this.CreateValidationError(ModelState));
}
var deposit = new NBXplorer.KeyPathTemplates(null).GetKeyPathTemplate(DerivationFeature.Deposit);
var line = strategy.AccountDerivation.GetLineFor(deposit);
var result = new OnChainPaymentMethodPreviewResultData();
for (var i = offset; i < amount; i++)
{
var derivation = line.Derive((uint)i);
result.Addresses.Add(
new
OnChainPaymentMethodPreviewResultData.
OnChainPaymentMethodPreviewResultAddressItem()
{
KeyPath = deposit.GetKeyPath((uint)i).ToString(),
Address = strategy.Network.NBXplorerNetwork.CreateAddress(strategy.AccountDerivation,
line.KeyPathTemplate.GetKeyPath((uint)i),
derivation.ScriptPubKey).ToString()
});
}
return(Ok(result));
}
public async Task <CreatePSBTResponse> CreatePSBT(BTCPayNetwork network, DerivationSchemeSettings derivationSettings, WalletSendModel sendModel, CancellationToken cancellationToken)
{
var nbx = ExplorerClientProvider.GetExplorerClient(network);
CreatePSBTRequest psbtRequest = new CreatePSBTRequest();
if (sendModel.InputSelection)
{
psbtRequest.IncludeOnlyOutpoints = sendModel.SelectedInputs?.Select(OutPoint.Parse)?.ToList() ?? new List <OutPoint>();
}
foreach (var transactionOutput in sendModel.Outputs)
{
var psbtDestination = new CreatePSBTDestination();
psbtRequest.Destinations.Add(psbtDestination);
psbtDestination.Destination = BitcoinAddress.Create(transactionOutput.DestinationAddress, network.NBitcoinNetwork);
psbtDestination.Amount = Money.Coins(transactionOutput.Amount.Value);
psbtDestination.SubstractFees = transactionOutput.SubtractFeesFromOutput;
}
if (network.SupportRBF)
{
if (sendModel.AllowFeeBump is WalletSendModel.ThreeStateBool.Yes)
{
psbtRequest.RBF = true;
}
if (sendModel.AllowFeeBump is WalletSendModel.ThreeStateBool.No)
{
psbtRequest.RBF = false;
}
}
psbtRequest.AlwaysIncludeNonWitnessUTXO = sendModel.AlwaysIncludeNonWitnessUTXO;
psbtRequest.FeePreference = new FeePreference();
if (sendModel.FeeSatoshiPerByte is decimal v &&
v > decimal.Zero)
{
psbtRequest.FeePreference.ExplicitFeeRate = new FeeRate(v);
}
if (sendModel.NoChange)
{
psbtRequest.ExplicitChangeAddress = psbtRequest.Destinations.First().Destination;
}
var psbt = (await nbx.CreatePSBTAsync(derivationSettings.AccountDerivation, psbtRequest, cancellationToken));
if (psbt == null)
{
throw new NotSupportedException("You need to update your version of NBXplorer");
}
// Not supported by coldcard, remove when they do support it
psbt.PSBT.GlobalXPubs.Clear();
return(psbt);
}
private async Task <PSBT> GetPayjoinProposedTX(string bpu, PSBT psbt, DerivationSchemeSettings derivationSchemeSettings, BTCPayNetwork btcPayNetwork, CancellationToken cancellationToken)
{
if (string.IsNullOrEmpty(bpu) || !Uri.TryCreate(bpu, UriKind.Absolute, out var endpoint))
{
throw new InvalidOperationException("No payjoin url available");
}
var cloned = psbt.Clone();
cloned = cloned.Finalize();
await _broadcaster.Schedule(DateTimeOffset.UtcNow + TimeSpan.FromMinutes(2.0), cloned.ExtractTransaction(), btcPayNetwork);
return(await _payjoinClient.RequestPayjoin(endpoint, derivationSchemeSettings, psbt, cancellationToken));
}
private async Task <PSBT> UpdatePSBT(DerivationSchemeSettings derivationSchemeSettings, PSBT psbt, BTCPayNetwork network)
{
var result = await ExplorerClientProvider.GetExplorerClient(network).UpdatePSBTAsync(new UpdatePSBTRequest()
{
PSBT = psbt,
DerivationScheme = derivationSchemeSettings.AccountDerivation,
});
if (result == null)
{
return(null);
}
derivationSchemeSettings.RebaseKeyPaths(result.PSBT);
return(result.PSBT);
}
public override ISupportedPaymentMethod DeserializeSupportedPaymentMethod(BTCPayNetworkBase network, JToken value)
{
ArgumentNullException.ThrowIfNull(network);
ArgumentNullException.ThrowIfNull(value);
var net = (BTCPayNetwork)network;
if (value is JObject jobj)
{
var scheme = net.NBXplorerNetwork.Serializer.ToObject <DerivationSchemeSettings>(jobj);
scheme.Network = net;
return(scheme);
}
// Legacy
return(DerivationSchemeSettings.Parse(((JValue)value).Value <string>(), net));
}
public async Task <IActionResult> WalletRescan(
[ModelBinder(typeof(WalletIdModelBinder))]
WalletId walletId)
{
if (walletId?.StoreId == null)
{
return(NotFound());
}
var store = await Repository.FindStore(walletId.StoreId, GetUserId());
DerivationSchemeSettings paymentMethod = GetPaymentMethod(walletId, store);
if (paymentMethod == null)
{
return(NotFound());
}
var vm = new RescanWalletModel();
vm.IsFullySync = _dashboard.IsFullySynched(walletId.CryptoCode, out var unused);
vm.IsServerAdmin = User.Claims.Any(c => c.Type == Policies.CanModifyServerSettings.Key && c.Value == "true");
vm.IsSupportedByCurrency = _dashboard.Get(walletId.CryptoCode)?.Status?.BitcoinStatus?.Capabilities?.CanScanTxoutSet == true;
var explorer = ExplorerClientProvider.GetExplorerClient(walletId.CryptoCode);
var scanProgress = await explorer.GetScanUTXOSetInformationAsync(paymentMethod.AccountDerivation);
if (scanProgress != null)
{
vm.PreviousError = scanProgress.Error;
if (scanProgress.Status == ScanUTXOStatus.Queued || scanProgress.Status == ScanUTXOStatus.Pending)
{
if (scanProgress.Progress == null)
{
vm.Progress = 0;
}
else
{
vm.Progress = scanProgress.Progress.OverallProgress;
vm.RemainingTime = TimeSpan.FromSeconds(scanProgress.Progress.RemainingSeconds).PrettyPrint();
}
}
if (scanProgress.Status == ScanUTXOStatus.Complete)
{
vm.LastSuccess = scanProgress.Progress;
vm.TimeOfScan = (scanProgress.Progress.CompletedAt.Value - scanProgress.Progress.StartedAt).PrettyPrint();
}
}
return(View(vm));
}
private IActionResult ShowAddresses(DerivationSchemeViewModel vm, DerivationSchemeSettings strategy)
{
vm.DerivationScheme = strategy.AccountDerivation.ToString();
if (!string.IsNullOrEmpty(vm.DerivationScheme))
{
var line = strategy.AccountDerivation.GetLineFor(DerivationFeature.Deposit);
for (int i = 0; i < 10; i++)
{
var address = line.Derive((uint)i);
vm.AddressSamples.Add((DerivationStrategyBase.GetKeyPath(DerivationFeature.Deposit).Derive((uint)i).ToString(), address.ScriptPubKey.GetDestinationAddress(strategy.Network.NBitcoinNetwork).ToString()));
}
}
vm.Confirmation = true;
return(View(vm));
}
public async Task <IActionResult> WalletTransactions(
[ModelBinder(typeof(WalletIdModelBinder))]
WalletId walletId, string labelFilter = null)
{
DerivationSchemeSettings paymentMethod = GetDerivationSchemeSettings(walletId);
if (paymentMethod == null)
{
return(NotFound());
}
var wallet = _walletProvider.GetWallet(paymentMethod.Network);
var walletBlobAsync = WalletRepository.GetWalletInfo(walletId);
var walletTransactionsInfoAsync = WalletRepository.GetWalletTransactionsInfo(walletId);
var transactions = await wallet.FetchTransactions(paymentMethod.AccountDerivation);
var walletBlob = await walletBlobAsync;
var walletTransactionsInfo = await walletTransactionsInfoAsync;
var model = new ListTransactionsViewModel();
foreach (var tx in transactions.UnconfirmedTransactions.Transactions.Concat(transactions.ConfirmedTransactions.Transactions).ToArray())
{
var vm = new ListTransactionsViewModel.TransactionViewModel();
vm.Id = tx.TransactionId.ToString();
vm.Link = string.Format(CultureInfo.InvariantCulture, paymentMethod.Network.BlockExplorerLink, vm.Id);
vm.Timestamp = tx.Timestamp;
vm.Positive = tx.BalanceChange >= Money.Zero;
vm.Balance = tx.BalanceChange.ToString();
vm.IsConfirmed = tx.Confirmations != 0;
if (walletTransactionsInfo.TryGetValue(tx.TransactionId.ToString(), out var transactionInfo))
{
var labels = walletBlob.GetLabels(transactionInfo);
vm.Labels.AddRange(labels);
model.Labels.AddRange(labels);
vm.Comment = transactionInfo.Comment;
}
if (labelFilter == null || vm.Labels.Any(l => l.Value.Equals(labelFilter, StringComparison.OrdinalIgnoreCase)))
{
model.Transactions.Add(vm);
}
}
model.Transactions = model.Transactions.OrderByDescending(t => t.Timestamp).ToList();
return(View(model));
}
public IActionResult GetOnChainPaymentMethodPreview(
string storeId,
string cryptoCode,
int offset = 0, int amount = 10)
{
if (!GetCryptoCodeWallet(cryptoCode, out var network, out BTCPayWallet _))
{
return(NotFound());
}
var paymentMethod = GetExistingBtcLikePaymentMethod(cryptoCode);
if (string.IsNullOrEmpty(paymentMethod?.DerivationScheme))
{
return(NotFound());
}
try
{
var strategy = DerivationSchemeSettings.Parse(paymentMethod.DerivationScheme, network);
var deposit = new NBXplorer.KeyPathTemplates(null).GetKeyPathTemplate(DerivationFeature.Deposit);
var line = strategy.AccountDerivation.GetLineFor(deposit);
var result = new OnChainPaymentMethodPreviewResultData();
for (var i = offset; i < amount; i++)
{
var address = line.Derive((uint)i);
result.Addresses.Add(
new OnChainPaymentMethodPreviewResultData.OnChainPaymentMethodPreviewResultAddressItem()
{
KeyPath = deposit.GetKeyPath((uint)i).ToString(),
Address = address.ScriptPubKey.GetDestinationAddress(strategy.Network.NBitcoinNetwork)
.ToString()
});
}
return(Ok(result));
}
catch
{
ModelState.AddModelError(nameof(OnChainPaymentMethodData.DerivationScheme),
"Invalid Derivation Scheme");
return(this.CreateValidationError(ModelState));
}
}
public static IEnumerable <ISupportedPaymentMethod> GetSupportedPaymentMethods(this StoreData storeData, BTCPayNetworkProvider networks)
{
if (storeData == null)
{
throw new ArgumentNullException(nameof(storeData));
}
#pragma warning disable CS0618
bool btcReturned = false;
// Legacy stuff which should go away
if (!string.IsNullOrEmpty(storeData.DerivationStrategy))
{
btcReturned = true;
yield return(DerivationSchemeSettings.Parse(storeData.DerivationStrategy, networks.BTC));
}
if (!string.IsNullOrEmpty(storeData.DerivationStrategies))
{
JObject strategies = JObject.Parse(storeData.DerivationStrategies);
foreach (var strat in strategies.Properties())
{
if (!PaymentMethodId.TryParse(strat.Name, out var paymentMethodId))
{
continue;
}
var network = networks.GetNetwork <BTCPayNetworkBase>(paymentMethodId.CryptoCode);
if (network != null)
{
if (network == networks.BTC && paymentMethodId.PaymentType == PaymentTypes.BTCLike && btcReturned)
{
continue;
}
if (strat.Value.Type == JTokenType.Null)
{
continue;
}
yield return
(paymentMethodId.PaymentType.DeserializeSupportedPaymentMethod(network, strat.Value));
}
}
}
#pragma warning restore CS0618
}
public async Task <IActionResult> UpdateOnChainPaymentMethod(string cryptoCode,
[FromBody] OnChainPaymentMethodData paymentMethodData)
{
var id = new PaymentMethodId(cryptoCode, PaymentTypes.BTCLike);
if (!GetCryptoCodeWallet(cryptoCode, out var network, out var wallet))
{
return(NotFound());
}
if (string.IsNullOrEmpty(paymentMethodData?.DerivationScheme))
{
ModelState.AddModelError(nameof(OnChainPaymentMethodData.DerivationScheme),
"Missing derivationScheme");
}
if (!ModelState.IsValid)
{
return(this.CreateValidationError(ModelState));
}
try
{
var store = Store;
var storeBlob = store.GetStoreBlob();
var strategy = DerivationSchemeSettings.Parse(paymentMethodData.DerivationScheme, network);
if (strategy != null)
{
await wallet.TrackAsync(strategy.AccountDerivation);
}
store.SetSupportedPaymentMethod(id, strategy);
storeBlob.SetExcluded(id, !paymentMethodData.Enabled);
store.SetStoreBlob(storeBlob);
await _storeRepository.UpdateStore(store);
return(Ok(GetExistingBtcLikePaymentMethod(cryptoCode, store)));
}
catch
{
ModelState.AddModelError(nameof(OnChainPaymentMethodData.DerivationScheme),
"Invalid Derivation Scheme");
return(this.CreateValidationError(ModelState));
}
}
private IActionResult ShowAddresses(DerivationSchemeViewModel vm, DerivationSchemeSettings strategy)
{
vm.DerivationScheme = strategy.AccountDerivation.ToString();
var deposit = new NBXplorer.KeyPathTemplates(null).GetKeyPathTemplate(DerivationFeature.Deposit);
if (!string.IsNullOrEmpty(vm.DerivationScheme))
{
var line = strategy.AccountDerivation.GetLineFor(deposit);
for (int i = 0; i < 10; i++)
{
var address = line.Derive((uint)i);
vm.AddressSamples.Add((deposit.GetKeyPath((uint)i).ToString(), address.ScriptPubKey.GetDestinationAddress(strategy.Network.NBitcoinNetwork).ToString()));
}
}
vm.Confirmation = true;
ModelState.Remove(nameof(vm.Config)); // Remove the cached value
return(View(vm));
}
private async Task <PSBT> TryGetPayjoinProposedTX(string bpu, PSBT psbt, DerivationSchemeSettings derivationSchemeSettings, BTCPayNetwork btcPayNetwork, CancellationToken cancellationToken)
{
if (!string.IsNullOrEmpty(bpu) && Uri.TryCreate(bpu, UriKind.Absolute, out var endpoint))
{
var cloned = psbt.Clone();
cloned = cloned.Finalize();
await _broadcaster.Schedule(DateTimeOffset.UtcNow + TimeSpan.FromMinutes(1.0), cloned.ExtractTransaction(), btcPayNetwork);
try
{
return(await _payjoinClient.RequestPayjoin(endpoint, derivationSchemeSettings, cloned, cancellationToken));
}
catch (Exception)
{
return(null);
}
}
return(null);
}
public IEnumerable <ISupportedPaymentMethod> GetSupportedPaymentMethods(BTCPayNetworkProvider networks)
{
#pragma warning disable CS0618
bool btcReturned = false;
// Legacy stuff which should go away
if (!string.IsNullOrEmpty(DerivationStrategy))
{
if (networks.BTC != null)
{
btcReturned = true;
yield return(DerivationSchemeSettings.Parse(DerivationStrategy, networks.BTC));
}
}
if (!string.IsNullOrEmpty(DerivationStrategies))
{
JObject strategies = JObject.Parse(DerivationStrategies);
foreach (var strat in strategies.Properties())
{
var paymentMethodId = PaymentMethodId.Parse(strat.Name);
var network = networks.GetNetwork <BTCPayNetwork>(paymentMethodId.CryptoCode);
if (network != null)
{
if (network == networks.BTC && paymentMethodId.PaymentType == PaymentTypes.BTCLike && btcReturned)
{
continue;
}
if (strat.Value.Type == JTokenType.Null)
{
continue;
}
yield return
(PaymentMethodHandlerDictionary[paymentMethodId]
.DeserializeSupportedPaymentMethod(paymentMethodId, strat.Value));
}
}
}
#pragma warning restore CS0618
}
public async Task <IActionResult> WalletSendLedger(
[ModelBinder(typeof(WalletIdModelBinder))]
WalletId walletId, WalletSendLedgerModel vm)
{
if (walletId?.StoreId == null)
{
return(NotFound());
}
var store = await Repository.FindStore(walletId.StoreId, GetUserId());
DerivationSchemeSettings paymentMethod = GetPaymentMethod(walletId, store);
if (paymentMethod == null)
{
return(NotFound());
}
var network = this.NetworkProvider.GetNetwork(walletId?.CryptoCode);
if (network == null)
{
return(NotFound());
}
return(View(vm));
}
public async Task <IActionResult> WalletSend(
[ModelBinder(typeof(WalletIdModelBinder))]
WalletId walletId, WalletSendModel vm, string command = "", CancellationToken cancellation = default)
{
if (walletId?.StoreId == null)
{
return(NotFound());
}
var store = await Repository.FindStore(walletId.StoreId, GetUserId());
if (store == null)
{
return(NotFound());
}
var network = this.NetworkProvider.GetNetwork <BTCPayNetwork>(walletId?.CryptoCode);
if (network == null || network.ReadonlyWallet)
{
return(NotFound());
}
vm.SupportRBF = network.SupportRBF;
decimal transactionAmountSum = 0;
if (command == "add-output")
{
ModelState.Clear();
vm.Outputs.Add(new WalletSendModel.TransactionOutput());
return(View(vm));
}
if (command.StartsWith("remove-output", StringComparison.InvariantCultureIgnoreCase))
{
ModelState.Clear();
var index = int.Parse(command.Substring(command.IndexOf(":", StringComparison.InvariantCultureIgnoreCase) + 1), CultureInfo.InvariantCulture);
vm.Outputs.RemoveAt(index);
return(View(vm));
}
if (!vm.Outputs.Any())
{
ModelState.AddModelError(string.Empty,
"Please add at least one transaction output");
return(View(vm));
}
var subtractFeesOutputsCount = new List <int>();
var substractFees = vm.Outputs.Any(o => o.SubtractFeesFromOutput);
for (var i = 0; i < vm.Outputs.Count; i++)
{
var transactionOutput = vm.Outputs[i];
if (transactionOutput.SubtractFeesFromOutput)
{
subtractFeesOutputsCount.Add(i);
}
transactionOutput.DestinationAddress = transactionOutput.DestinationAddress?.Trim() ?? string.Empty;
try
{
BitcoinAddress.Create(transactionOutput.DestinationAddress, network.NBitcoinNetwork);
}
catch
{
var inputName =
string.Format(CultureInfo.InvariantCulture, "Outputs[{0}].", i.ToString(CultureInfo.InvariantCulture)) +
nameof(transactionOutput.DestinationAddress);
ModelState.AddModelError(inputName, "Invalid address");
}
if (transactionOutput.Amount.HasValue)
{
transactionAmountSum += transactionOutput.Amount.Value;
if (vm.CurrentBalance == transactionOutput.Amount.Value &&
!transactionOutput.SubtractFeesFromOutput)
{
vm.AddModelError(model => model.Outputs[i].SubtractFeesFromOutput,
"You are sending your entire balance to the same destination, you should subtract the fees",
this);
}
}
}
if (subtractFeesOutputsCount.Count > 1)
{
foreach (var subtractFeesOutput in subtractFeesOutputsCount)
{
vm.AddModelError(model => model.Outputs[subtractFeesOutput].SubtractFeesFromOutput,
"You can only subtract fees from one output", this);
}
}
else if (vm.CurrentBalance == transactionAmountSum && !substractFees)
{
ModelState.AddModelError(string.Empty,
"You are sending your entire balance, you should subtract the fees from an output");
}
if (vm.CurrentBalance < transactionAmountSum)
{
for (var i = 0; i < vm.Outputs.Count; i++)
{
vm.AddModelError(model => model.Outputs[i].Amount,
"You are sending more than what you own", this);
}
}
if (!ModelState.IsValid)
{
return(View(vm));
}
DerivationSchemeSettings derivationScheme = GetDerivationSchemeSettings(walletId);
CreatePSBTResponse psbt = null;
try
{
psbt = await CreatePSBT(network, derivationScheme, vm, cancellation);
}
catch (NBXplorerException ex)
{
ModelState.AddModelError(string.Empty, ex.Error.Message);
return(View(vm));
}
catch (NotSupportedException)
{
ModelState.AddModelError(string.Empty, "You need to update your version of NBXplorer");
return(View(vm));
}
derivationScheme.RebaseKeyPaths(psbt.PSBT);
switch (command)
{
case "vault":
return(ViewVault(walletId, psbt.PSBT));
case "ledger":
return(ViewWalletSendLedger(psbt.PSBT, psbt.ChangeAddress));
case "seed":
return(SignWithSeed(walletId, psbt.PSBT.ToBase64()));
case "analyze-psbt":
var name =
$"Send-{string.Join('_', vm.Outputs.Select(output => $"{output.Amount}->{output.DestinationAddress}{(output.SubtractFeesFromOutput ? "-Fees" : string.Empty)}"))}.psbt";
return(RedirectToWalletPSBT(walletId, psbt.PSBT, name));
default:
return(View(vm));
}
}
public async Task <IActionResult> WalletSend(
[ModelBinder(typeof(WalletIdModelBinder))]
WalletId walletId, string defaultDestination = null, string defaultAmount = null)
{
if (walletId?.StoreId == null)
{
return(NotFound());
}
var store = await Repository.FindStore(walletId.StoreId, GetUserId());
DerivationSchemeSettings paymentMethod = GetDerivationSchemeSettings(walletId);
if (paymentMethod == null)
{
return(NotFound());
}
var network = this.NetworkProvider.GetNetwork <BTCPayNetwork>(walletId?.CryptoCode);
if (network == null || network.ReadonlyWallet)
{
return(NotFound());
}
var storeData = store.GetStoreBlob();
var rateRules = store.GetStoreBlob().GetRateRules(NetworkProvider);
rateRules.Spread = 0.0m;
var currencyPair = new Rating.CurrencyPair(paymentMethod.PaymentId.CryptoCode, GetCurrencyCode(storeData.DefaultLang) ?? "USD");
double.TryParse(defaultAmount, out var amount);
var model = new WalletSendModel()
{
Outputs = new List <WalletSendModel.TransactionOutput>()
{
new WalletSendModel.TransactionOutput()
{
Amount = Convert.ToDecimal(amount),
DestinationAddress = defaultDestination
}
},
CryptoCode = walletId.CryptoCode
};
var feeProvider = _feeRateProvider.CreateFeeProvider(network);
var recommendedFees = feeProvider.GetFeeRateAsync();
var balance = _walletProvider.GetWallet(network).GetBalance(paymentMethod.AccountDerivation);
model.CurrentBalance = await balance;
model.RecommendedSatoshiPerByte = (int)(await recommendedFees).GetFee(1).Satoshi;
model.FeeSatoshiPerByte = model.RecommendedSatoshiPerByte;
model.SupportRBF = network.SupportRBF;
using (CancellationTokenSource cts = new CancellationTokenSource())
{
try
{
cts.CancelAfter(TimeSpan.FromSeconds(5));
var result = await RateFetcher.FetchRate(currencyPair, rateRules, cts.Token).WithCancellation(cts.Token);
if (result.BidAsk != null)
{
model.Rate = result.BidAsk.Center;
model.Divisibility = _currencyTable.GetNumberFormatInfo(currencyPair.Right, true).CurrencyDecimalDigits;
model.Fiat = currencyPair.Right;
}
else
{
model.RateError = $"{result.EvaluatedRule} ({string.Join(", ", result.Errors.OfType<object>().ToArray())})";
}
}
catch (Exception ex) { model.RateError = ex.Message; }
}
return(View(model));
}
public async Task <IActionResult> ModifyTransaction(
// We need addlabel and addlabelclick. addlabel is the + button if the label does not exists,
// addlabelclick is if the user click on existing label. For some reason, reusing the same name attribute for both
// does not work
[ModelBinder(typeof(WalletIdModelBinder))]
WalletId walletId, string transactionId,
string addlabel = null,
string addlabelclick = null,
string addcomment = null,
string removelabel = null)
{
addlabel = addlabel ?? addlabelclick;
// Hack necessary when the user enter a empty comment and submit.
// For some reason asp.net consider addcomment null instead of empty string...
try
{
if (addcomment == null && Request?.Form?.TryGetValue(nameof(addcomment), out _) is true)
{
addcomment = string.Empty;
}
}
catch { }
/////////
DerivationSchemeSettings paymentMethod = GetDerivationSchemeSettings(walletId);
if (paymentMethod == null)
{
return(NotFound());
}
var walletBlobInfoAsync = WalletRepository.GetWalletInfo(walletId);
var walletTransactionsInfoAsync = WalletRepository.GetWalletTransactionsInfo(walletId);
var wallet = _walletProvider.GetWallet(paymentMethod.Network);
var walletBlobInfo = await walletBlobInfoAsync;
var walletTransactionsInfo = await walletTransactionsInfoAsync;
if (addlabel != null)
{
addlabel = addlabel.Trim().ToLowerInvariant().Replace(',', ' ').Truncate(MaxLabelSize);
var labels = walletBlobInfo.GetLabels();
if (!walletTransactionsInfo.TryGetValue(transactionId, out var walletTransactionInfo))
{
walletTransactionInfo = new WalletTransactionInfo();
}
if (!labels.Any(l => l.Value.Equals(addlabel, StringComparison.OrdinalIgnoreCase)))
{
List <string> allColors = new List <string>();
allColors.AddRange(LabelColorScheme);
allColors.AddRange(labels.Select(l => l.Color));
var chosenColor =
allColors
.GroupBy(k => k)
.OrderBy(k => k.Count())
.ThenBy(k => Array.IndexOf(LabelColorScheme, k.Key))
.First().Key;
walletBlobInfo.LabelColors.Add(addlabel, chosenColor);
await WalletRepository.SetWalletInfo(walletId, walletBlobInfo);
}
if (walletTransactionInfo.Labels.Add(addlabel))
{
await WalletRepository.SetWalletTransactionInfo(walletId, transactionId, walletTransactionInfo);
}
}
else if (removelabel != null)
{
removelabel = removelabel.Trim().ToLowerInvariant().Truncate(MaxLabelSize);
if (walletTransactionsInfo.TryGetValue(transactionId, out var walletTransactionInfo))
{
if (walletTransactionInfo.Labels.Remove(removelabel))
{
var canDelete = !walletTransactionsInfo.SelectMany(txi => txi.Value.Labels).Any(l => l == removelabel);
if (canDelete)
{
walletBlobInfo.LabelColors.Remove(removelabel);
await WalletRepository.SetWalletInfo(walletId, walletBlobInfo);
}
await WalletRepository.SetWalletTransactionInfo(walletId, transactionId, walletTransactionInfo);
}
}
}
else if (addcomment != null)
{
addcomment = addcomment.Trim().Truncate(MaxCommentSize);
if (!walletTransactionsInfo.TryGetValue(transactionId, out var walletTransactionInfo))
{
walletTransactionInfo = new WalletTransactionInfo();
}
walletTransactionInfo.Comment = addcomment;
await WalletRepository.SetWalletTransactionInfo(walletId, transactionId, walletTransactionInfo);
}
return(RedirectToAction(nameof(WalletTransactions), new { walletId = walletId.ToString() }));
}
public async Task <IActionResult> Submit(string cryptoCode,
long?maxadditionalfeecontribution,
int?additionalfeeoutputindex,
decimal minfeerate = -1.0m,
bool disableoutputsubstitution = false,
int v = 1)
{
var network = _btcPayNetworkProvider.GetNetwork <BTCPayNetwork>(cryptoCode);
if (network == null)
{
return(NotFound());
}
if (v != 1)
{
return(BadRequest(new JObject
{
new JProperty("errorCode", "version-unsupported"),
new JProperty("supported", new JArray(1)),
new JProperty("message", "This version of payjoin is not supported.")
}));
}
await using var ctx = new PayjoinReceiverContext(_invoiceRepository, _explorerClientProvider.GetExplorerClient(network), _payJoinRepository);
ObjectResult CreatePayjoinErrorAndLog(int httpCode, PayjoinReceiverWellknownErrors err, string debug)
{
ctx.Logs.Write($"Payjoin error: {debug}");
return(StatusCode(httpCode, CreatePayjoinError(err, debug)));
}
var explorer = _explorerClientProvider.GetExplorerClient(network);
if (Request.ContentLength is long length)
{
if (length > 1_000_000)
{
return(this.StatusCode(413,
CreatePayjoinError("payload-too-large", "The transaction is too big to be processed")));
}
}
else
{
return(StatusCode(411,
CreatePayjoinError("missing-content-length",
"The http header Content-Length should be filled")));
}
string rawBody;
using (StreamReader reader = new StreamReader(Request.Body, Encoding.UTF8))
{
rawBody = (await reader.ReadToEndAsync()) ?? string.Empty;
}
FeeRate originalFeeRate = null;
bool psbtFormat = true;
if (PSBT.TryParse(rawBody, network.NBitcoinNetwork, out var psbt))
{
if (!psbt.IsAllFinalized())
{
return(BadRequest(CreatePayjoinError("original-psbt-rejected", "The PSBT should be finalized")));
}
ctx.OriginalTransaction = psbt.ExtractTransaction();
}
// BTCPay Server implementation support a transaction instead of PSBT
else
{
psbtFormat = false;
if (!Transaction.TryParse(rawBody, network.NBitcoinNetwork, out var tx))
{
return(BadRequest(CreatePayjoinError("original-psbt-rejected", "invalid transaction or psbt")));
}
ctx.OriginalTransaction = tx;
psbt = PSBT.FromTransaction(tx, network.NBitcoinNetwork);
psbt = (await explorer.UpdatePSBTAsync(new UpdatePSBTRequest()
{
PSBT = psbt
})).PSBT;
for (int i = 0; i < tx.Inputs.Count; i++)
{
psbt.Inputs[i].FinalScriptSig = tx.Inputs[i].ScriptSig;
psbt.Inputs[i].FinalScriptWitness = tx.Inputs[i].WitScript;
}
}
FeeRate senderMinFeeRate = minfeerate >= 0.0m ? new FeeRate(minfeerate) : null;
Money allowedSenderFeeContribution = Money.Satoshis(maxadditionalfeecontribution is long t && t >= 0 ? t : 0);
var sendersInputType = psbt.GetInputsScriptPubKeyType();
if (psbt.CheckSanity() is var errors && errors.Count != 0)
{
return(BadRequest(CreatePayjoinError("original-psbt-rejected", $"This PSBT is insane ({errors[0]})")));
}
if (!psbt.TryGetEstimatedFeeRate(out originalFeeRate))
{
return(BadRequest(CreatePayjoinError("original-psbt-rejected",
"You need to provide Witness UTXO information to the PSBT.")));
}
// This is actually not a mandatory check, but we don't want implementers
// to leak global xpubs
if (psbt.GlobalXPubs.Any())
{
return(BadRequest(CreatePayjoinError("original-psbt-rejected",
"GlobalXPubs should not be included in the PSBT")));
}
if (psbt.Outputs.Any(o => o.HDKeyPaths.Count != 0) || psbt.Inputs.Any(o => o.HDKeyPaths.Count != 0))
{
return(BadRequest(CreatePayjoinError("original-psbt-rejected",
"Keypath information should not be included in the PSBT")));
}
if (psbt.Inputs.Any(o => !o.IsFinalized()))
{
return(BadRequest(CreatePayjoinError("original-psbt-rejected", "The PSBT Should be finalized")));
}
////////////
var mempool = await explorer.BroadcastAsync(ctx.OriginalTransaction, true);
if (!mempool.Success)
{
ctx.DoNotBroadcast();
return(BadRequest(CreatePayjoinError("original-psbt-rejected",
$"Provided transaction isn't mempool eligible {mempool.RPCCodeMessage}")));
}
var enforcedLowR = ctx.OriginalTransaction.Inputs.All(IsLowR);
var paymentMethodId = new PaymentMethodId(network.CryptoCode, PaymentTypes.BTCLike);
bool paidSomething = false;
Money due = null;
Dictionary <OutPoint, UTXO> selectedUTXOs = new Dictionary <OutPoint, UTXO>();
PSBTOutput originalPaymentOutput = null;
BitcoinAddress paymentAddress = null;
InvoiceEntity invoice = null;
DerivationSchemeSettings derivationSchemeSettings = null;
foreach (var output in psbt.Outputs)
{
var key = output.ScriptPubKey.Hash + "#" + network.CryptoCode.ToUpperInvariant();
invoice = (await _invoiceRepository.GetInvoicesFromAddresses(new[] { key })).FirstOrDefault();
if (invoice is null)
{
continue;
}
derivationSchemeSettings = invoice.GetSupportedPaymentMethod <DerivationSchemeSettings>(paymentMethodId)
.SingleOrDefault();
if (derivationSchemeSettings is null)
{
continue;
}
var receiverInputsType = derivationSchemeSettings.AccountDerivation.ScriptPubKeyType();
if (!PayjoinClient.SupportedFormats.Contains(receiverInputsType))
{
//this should never happen, unless the store owner changed the wallet mid way through an invoice
return(CreatePayjoinErrorAndLog(503, PayjoinReceiverWellknownErrors.Unavailable, "Our wallet does not support payjoin"));
}
if (sendersInputType is ScriptPubKeyType t1 && t1 != receiverInputsType)
{
return(CreatePayjoinErrorAndLog(503, PayjoinReceiverWellknownErrors.Unavailable, "We do not have any UTXO available for making a payjoin with the sender's inputs type"));
}
var paymentMethod = invoice.GetPaymentMethod(paymentMethodId);
var paymentDetails =
paymentMethod.GetPaymentMethodDetails() as Payments.Bitcoin.BitcoinLikeOnChainPaymentMethod;
if (paymentDetails is null || !paymentDetails.PayjoinEnabled)
{
continue;
}
if (invoice.GetAllBitcoinPaymentData().Any())
{
ctx.DoNotBroadcast();
return(UnprocessableEntity(CreatePayjoinError("already-paid",
$"The invoice this PSBT is paying has already been partially or completely paid")));
}
paidSomething = true;
due = paymentMethod.Calculate().TotalDue - output.Value;
if (due > Money.Zero)
{
break;
}
if (!await _payJoinRepository.TryLockInputs(ctx.OriginalTransaction.Inputs.Select(i => i.PrevOut).ToArray()))
{
return(CreatePayjoinErrorAndLog(503, PayjoinReceiverWellknownErrors.Unavailable, "Some of those inputs have already been used to make another payjoin transaction"));
}
var utxos = (await explorer.GetUTXOsAsync(derivationSchemeSettings.AccountDerivation))
.GetUnspentUTXOs(false);
// In case we are paying ourselves, be need to make sure
// we can't take spent outpoints.
var prevOuts = ctx.OriginalTransaction.Inputs.Select(o => o.PrevOut).ToHashSet();
utxos = utxos.Where(u => !prevOuts.Contains(u.Outpoint)).ToArray();
Array.Sort(utxos, UTXODeterministicComparer.Instance);
foreach (var utxo in (await SelectUTXO(network, utxos, psbt.Inputs.Select(input => input.WitnessUtxo.Value.ToDecimal(MoneyUnit.BTC)), output.Value.ToDecimal(MoneyUnit.BTC),
psbt.Outputs.Where(psbtOutput => psbtOutput.Index != output.Index).Select(psbtOutput => psbtOutput.Value.ToDecimal(MoneyUnit.BTC)))).selectedUTXO)
{
selectedUTXOs.Add(utxo.Outpoint, utxo);
}
ctx.LockedUTXOs = selectedUTXOs.Select(u => u.Key).ToArray();
originalPaymentOutput = output;
paymentAddress = paymentDetails.GetDepositAddress(network.NBitcoinNetwork);
break;
}
if (!paidSomething)
{
return(BadRequest(CreatePayjoinError("invoice-not-found",
"This transaction does not pay any invoice with payjoin")));
}
if (due is null || due > Money.Zero)
{
return(BadRequest(CreatePayjoinError("invoice-not-fully-paid",
"The transaction must pay the whole invoice")));
}
if (selectedUTXOs.Count == 0)
{
return(CreatePayjoinErrorAndLog(503, PayjoinReceiverWellknownErrors.Unavailable, "We do not have any UTXO available for contributing to a payjoin"));
}
var originalPaymentValue = originalPaymentOutput.Value;
await _broadcaster.Schedule(DateTimeOffset.UtcNow + TimeSpan.FromMinutes(2.0), ctx.OriginalTransaction, network);
//check if wallet of store is configured to be hot wallet
var extKeyStr = await explorer.GetMetadataAsync <string>(
derivationSchemeSettings.AccountDerivation,
WellknownMetadataKeys.AccountHDKey);
if (extKeyStr == null)
{
// This should not happen, as we check the existance of private key before creating invoice with payjoin
return(CreatePayjoinErrorAndLog(503, PayjoinReceiverWellknownErrors.Unavailable, "The HD Key of the store changed"));
}
Money contributedAmount = Money.Zero;
var newTx = ctx.OriginalTransaction.Clone();
var ourNewOutput = newTx.Outputs[originalPaymentOutput.Index];
HashSet <TxOut> isOurOutput = new HashSet <TxOut>();
isOurOutput.Add(ourNewOutput);
TxOut feeOutput =
additionalfeeoutputindex is int feeOutputIndex &&
maxadditionalfeecontribution is long v3 &&
v3 >= 0 &&
feeOutputIndex >= 0 &&
feeOutputIndex < newTx.Outputs.Count &&
!isOurOutput.Contains(newTx.Outputs[feeOutputIndex])
? newTx.Outputs[feeOutputIndex] : null;
var rand = new Random();
int senderInputCount = newTx.Inputs.Count;
foreach (var selectedUTXO in selectedUTXOs.Select(o => o.Value))
{
contributedAmount += (Money)selectedUTXO.Value;
var newInput = newTx.Inputs.Add(selectedUTXO.Outpoint);
newInput.Sequence = newTx.Inputs[rand.Next(0, senderInputCount)].Sequence;
}
ourNewOutput.Value += contributedAmount;
var minRelayTxFee = this._dashboard.Get(network.CryptoCode).Status.BitcoinStatus?.MinRelayTxFee ??
new FeeRate(1.0m);
// Remove old signatures as they are not valid anymore
foreach (var input in newTx.Inputs)
{
input.WitScript = WitScript.Empty;
}
Money ourFeeContribution = Money.Zero;
// We need to adjust the fee to keep a constant fee rate
var txBuilder = network.NBitcoinNetwork.CreateTransactionBuilder();
var coins = psbt.Inputs.Select(i => i.GetSignableCoin())
.Concat(selectedUTXOs.Select(o => o.Value.AsCoin(derivationSchemeSettings.AccountDerivation))).ToArray();
txBuilder.AddCoins(coins);
Money expectedFee = txBuilder.EstimateFees(newTx, originalFeeRate);
Money actualFee = newTx.GetFee(txBuilder.FindSpentCoins(newTx));
Money additionalFee = expectedFee - actualFee;
if (additionalFee > Money.Zero)
{
// If the user overpaid, taking fee on our output (useful if sender dump a full UTXO for privacy)
for (int i = 0; i < newTx.Outputs.Count && additionalFee > Money.Zero && due < Money.Zero; i++)
{
if (disableoutputsubstitution)
{
break;
}
if (isOurOutput.Contains(newTx.Outputs[i]))
{
var outputContribution = Money.Min(additionalFee, -due);
outputContribution = Money.Min(outputContribution,
newTx.Outputs[i].Value - newTx.Outputs[i].GetDustThreshold(minRelayTxFee));
newTx.Outputs[i].Value -= outputContribution;
additionalFee -= outputContribution;
due += outputContribution;
ourFeeContribution += outputContribution;
}
}
// The rest, we take from user's change
if (feeOutput != null)
{
var outputContribution = Money.Min(additionalFee, feeOutput.Value);
outputContribution = Money.Min(outputContribution,
feeOutput.Value - feeOutput.GetDustThreshold(minRelayTxFee));
outputContribution = Money.Min(outputContribution, allowedSenderFeeContribution);
feeOutput.Value -= outputContribution;
additionalFee -= outputContribution;
allowedSenderFeeContribution -= outputContribution;
}
if (additionalFee > Money.Zero)
{
// We could not pay fully the additional fee, however, as long as
// we are not under the relay fee, it should be OK.
var newVSize = txBuilder.EstimateSize(newTx, true);
var newFeePaid = newTx.GetFee(txBuilder.FindSpentCoins(newTx));
if (new FeeRate(newFeePaid, newVSize) < (senderMinFeeRate ?? minRelayTxFee))
{
return(CreatePayjoinErrorAndLog(422, PayjoinReceiverWellknownErrors.NotEnoughMoney, "Not enough money is sent to pay for the additional payjoin inputs"));
}
}
}
var accountKey = ExtKey.Parse(extKeyStr, network.NBitcoinNetwork);
var newPsbt = PSBT.FromTransaction(newTx, network.NBitcoinNetwork);
foreach (var selectedUtxo in selectedUTXOs.Select(o => o.Value))
{
var signedInput = newPsbt.Inputs.FindIndexedInput(selectedUtxo.Outpoint);
var coin = selectedUtxo.AsCoin(derivationSchemeSettings.AccountDerivation);
signedInput.UpdateFromCoin(coin);
var privateKey = accountKey.Derive(selectedUtxo.KeyPath).PrivateKey;
signedInput.Sign(privateKey, new SigningOptions()
{
EnforceLowR = enforcedLowR
});
signedInput.FinalizeInput();
newTx.Inputs[signedInput.Index].WitScript = newPsbt.Inputs[(int)signedInput.Index].FinalScriptWitness;
}
// Add the transaction to the payments with a confirmation of -1.
// This will make the invoice paid even if the user do not
// broadcast the payjoin.
var originalPaymentData = new BitcoinLikePaymentData(paymentAddress,
originalPaymentOutput.Value,
new OutPoint(ctx.OriginalTransaction.GetHash(), originalPaymentOutput.Index),
ctx.OriginalTransaction.RBF);
originalPaymentData.ConfirmationCount = -1;
originalPaymentData.PayjoinInformation = new PayjoinInformation()
{
CoinjoinTransactionHash = GetExpectedHash(newPsbt, coins),
CoinjoinValue = originalPaymentValue - ourFeeContribution,
ContributedOutPoints = selectedUTXOs.Select(o => o.Key).ToArray()
};
var payment = await _invoiceRepository.AddPayment(invoice.Id, DateTimeOffset.UtcNow, originalPaymentData, network, true);
if (payment is null)
{
return(UnprocessableEntity(CreatePayjoinError("already-paid",
$"The original transaction has already been accounted")));
}
await _btcPayWalletProvider.GetWallet(network).SaveOffchainTransactionAsync(ctx.OriginalTransaction);
_eventAggregator.Publish(new InvoiceEvent(invoice, 1002, InvoiceEvent.ReceivedPayment)
{
Payment = payment
});
_eventAggregator.Publish(new UpdateTransactionLabel()
{
WalletId = new WalletId(invoice.StoreId, network.CryptoCode),
TransactionLabels = selectedUTXOs.GroupBy(pair => pair.Key.Hash).Select(utxo =>
new KeyValuePair <uint256, List <(string color, string label)> >(utxo.Key,
new List <(string color, string label)>()
{
UpdateTransactionLabel.PayjoinExposedLabelTemplate(invoice.Id)
}))
.ToDictionary(pair => pair.Key, pair => pair.Value)
});
public async Task <IActionResult> WalletPSBTReady(
[ModelBinder(typeof(WalletIdModelBinder))]
WalletId walletId, WalletPSBTViewModel vm, string command, CancellationToken cancellationToken = default)
{
var network = NetworkProvider.GetNetwork <BTCPayNetwork>(walletId.CryptoCode);
PSBT psbt = await vm.GetPSBT(network.NBitcoinNetwork);
if (vm.InvalidPSBT || psbt is null)
{
if (vm.InvalidPSBT)
{
vm.GlobalError = "Invalid PSBT";
}
return(View(nameof(WalletPSBT), vm));
}
DerivationSchemeSettings derivationSchemeSettings = GetDerivationSchemeSettings(walletId);
if (derivationSchemeSettings == null)
{
return(NotFound());
}
await FetchTransactionDetails(derivationSchemeSettings, vm, network);
switch (command)
{
case "payjoin":
string error;
try
{
var proposedPayjoin = await GetPayjoinProposedTX(new BitcoinUrlBuilder(vm.SigningContext.PayJoinBIP21, network.NBitcoinNetwork), psbt,
derivationSchemeSettings, network, cancellationToken);
try
{
proposedPayjoin.Settings.SigningOptions = new SigningOptions
{
EnforceLowR = !(vm.SigningContext?.EnforceLowR is false)
};
var extKey = ExtKey.Parse(vm.SigningKey, network.NBitcoinNetwork);
proposedPayjoin = proposedPayjoin.SignAll(derivationSchemeSettings.AccountDerivation,
extKey,
RootedKeyPath.Parse(vm.SigningKeyPath));
vm.SigningContext.PSBT = proposedPayjoin.ToBase64();
vm.SigningContext.OriginalPSBT = psbt.ToBase64();
proposedPayjoin.Finalize();
var hash = proposedPayjoin.ExtractTransaction().GetHash();
_EventAggregator.Publish(new UpdateTransactionLabel(walletId, hash, UpdateTransactionLabel.PayjoinLabelTemplate()));
TempData.SetStatusMessageModel(new StatusMessageModel
{
Severity = StatusMessageModel.StatusSeverity.Success,
AllowDismiss = false,
Html = $"The payjoin transaction has been successfully broadcasted ({proposedPayjoin.ExtractTransaction().GetHash()})"
});
return(await WalletPSBTReady(walletId, vm, "broadcast"));
}
catch (Exception)
{
TempData.SetStatusMessageModel(new StatusMessageModel()
{
Severity = StatusMessageModel.StatusSeverity.Warning,
AllowDismiss = false,
Html =
"This transaction has been coordinated between the receiver and you to create a <a href='https://en.bitcoin.it/wiki/PayJoin' target='_blank'>payjoin transaction</a> by adding inputs from the receiver.<br/>" +
"The amount being sent may appear higher but is in fact almost same.<br/><br/>" +
"If you cancel or refuse to sign this transaction, the payment will proceed without payjoin"
});
vm.SigningContext.PSBT = proposedPayjoin.ToBase64();
vm.SigningContext.OriginalPSBT = psbt.ToBase64();
return(ViewVault(walletId, vm.SigningContext));
}
}
catch (PayjoinReceiverException ex)
{
error = $"The payjoin receiver could not complete the payjoin: {ex.Message}";
}
catch (PayjoinSenderException ex)
{
error = $"We rejected the receiver's payjoin proposal: {ex.Message}";
}
catch (Exception ex)
{
error = $"Unexpected payjoin error: {ex.Message}";
}
//we possibly exposed the tx to the receiver, so we need to broadcast straight away
psbt.Finalize();
TempData.SetStatusMessageModel(new StatusMessageModel
{
Severity = StatusMessageModel.StatusSeverity.Warning,
AllowDismiss = false,
Html = $"The payjoin transaction could not be created.<br/>" +
$"The original transaction was broadcasted instead. ({psbt.ExtractTransaction().GetHash()})<br/><br/>" +
$"{error}"
});
return(await WalletPSBTReady(walletId, vm, "broadcast"));
case "broadcast" when !psbt.IsAllFinalized() && !psbt.TryFinalize(out var errors):
vm.SetErrors(errors);
return(View(nameof(WalletPSBT), vm));
case "broadcast":
{
var transaction = psbt.ExtractTransaction();
try
{
var broadcastResult = await ExplorerClientProvider.GetExplorerClient(network).BroadcastAsync(transaction);
if (!broadcastResult.Success)
{
if (!string.IsNullOrEmpty(vm.SigningContext.OriginalPSBT))
{
TempData.SetStatusMessageModel(new StatusMessageModel
{
Severity = StatusMessageModel.StatusSeverity.Warning,
AllowDismiss = false,
Html = $"The payjoin transaction could not be broadcasted.<br/>({broadcastResult.RPCCode} {broadcastResult.RPCCodeMessage} {broadcastResult.RPCMessage}).<br/>The transaction has been reverted back to its original format and has been broadcast."
});
vm.SigningContext.PSBT = vm.SigningContext.OriginalPSBT;
vm.SigningContext.OriginalPSBT = null;
return(await WalletPSBTReady(walletId, vm, "broadcast"));
}
vm.GlobalError = $"RPC Error while broadcasting: {broadcastResult.RPCCode} {broadcastResult.RPCCodeMessage} {broadcastResult.RPCMessage}";
return(View(nameof(WalletPSBT), vm));
}
else
{
var wallet = _walletProvider.GetWallet(network);
var derivationSettings = GetDerivationSchemeSettings(walletId);
wallet.InvalidateCache(derivationSettings.AccountDerivation);
}
}
catch (Exception ex)
{
vm.GlobalError = "Error while broadcasting: " + ex.Message;
return(View(nameof(WalletPSBT), vm));
}
if (!TempData.HasStatusMessage())
{
TempData[WellKnownTempData.SuccessMessage] = $"Transaction broadcasted successfully ({transaction.GetHash()})";
}
var returnUrl = this.HttpContext.Request.Query["returnUrl"].FirstOrDefault();
if (returnUrl is not null)
{
return(Redirect(returnUrl));
}
return(RedirectToAction(nameof(WalletTransactions), new { walletId = walletId.ToString() }));
}
case "analyze-psbt":
return(RedirectToWalletPSBT(new WalletPSBTViewModel()
{
PSBT = psbt.ToBase64()
}));
case "decode":
await FetchTransactionDetails(derivationSchemeSettings, vm, network);
return(View("WalletPSBTDecoded", vm));
default:
vm.GlobalError = "Unknown command";
return(View(nameof(WalletPSBT), vm));
}
}
private async Task FetchTransactionDetails(DerivationSchemeSettings derivationSchemeSettings, WalletPSBTReadyViewModel vm, BTCPayNetwork network)
{
var psbtObject = PSBT.Parse(vm.SigningContext.PSBT, network.NBitcoinNetwork);
if (!psbtObject.IsAllFinalized())
{
psbtObject = await ExplorerClientProvider.UpdatePSBT(derivationSchemeSettings, psbtObject) ?? psbtObject;
}
IHDKey signingKey = null;
RootedKeyPath signingKeyPath = null;
try
{
signingKey = new BitcoinExtPubKey(vm.SigningKey, network.NBitcoinNetwork);
}
catch { }
try
{
signingKey = signingKey ?? new BitcoinExtKey(vm.SigningKey, network.NBitcoinNetwork);
}
catch { }
try
{
signingKeyPath = RootedKeyPath.Parse(vm.SigningKeyPath);
}
catch { }
if (signingKey == null || signingKeyPath == null)
{
var signingKeySettings = derivationSchemeSettings.GetSigningAccountKeySettings();
if (signingKey == null)
{
signingKey = signingKeySettings.AccountKey;
vm.SigningKey = signingKey.ToString();
}
if (vm.SigningKeyPath == null)
{
signingKeyPath = signingKeySettings.GetRootedKeyPath();
vm.SigningKeyPath = signingKeyPath?.ToString();
}
}
if (psbtObject.IsAllFinalized())
{
vm.CanCalculateBalance = false;
}
else
{
var balanceChange = psbtObject.GetBalance(derivationSchemeSettings.AccountDerivation, signingKey, signingKeyPath);
vm.BalanceChange = ValueToString(balanceChange, network);
vm.CanCalculateBalance = true;
vm.Positive = balanceChange >= Money.Zero;
}
vm.Inputs = new List <WalletPSBTReadyViewModel.InputViewModel>();
foreach (var input in psbtObject.Inputs)
{
var inputVm = new WalletPSBTReadyViewModel.InputViewModel();
vm.Inputs.Add(inputVm);
var mine = input.HDKeysFor(derivationSchemeSettings.AccountDerivation, signingKey, signingKeyPath).Any();
var balanceChange2 = input.GetTxOut()?.Value ?? Money.Zero;
if (mine)
{
balanceChange2 = -balanceChange2;
}
inputVm.BalanceChange = ValueToString(balanceChange2, network);
inputVm.Positive = balanceChange2 >= Money.Zero;
inputVm.Index = (int)input.Index;
}
vm.Destinations = new List <WalletPSBTReadyViewModel.DestinationViewModel>();
foreach (var output in psbtObject.Outputs)
{
var dest = new WalletPSBTReadyViewModel.DestinationViewModel();
vm.Destinations.Add(dest);
var mine = output.HDKeysFor(derivationSchemeSettings.AccountDerivation, signingKey, signingKeyPath).Any();
var balanceChange2 = output.Value;
if (!mine)
{
balanceChange2 = -balanceChange2;
}
dest.Balance = ValueToString(balanceChange2, network);
dest.Positive = balanceChange2 >= Money.Zero;
dest.Destination = output.ScriptPubKey.GetDestinationAddress(network.NBitcoinNetwork)?.ToString() ?? output.ScriptPubKey.ToString();
}
if (psbtObject.TryGetFee(out var fee))
{
vm.Destinations.Add(new WalletPSBTReadyViewModel.DestinationViewModel
{
Positive = false,
Balance = ValueToString(-fee, network),
Destination = "Mining fees"
});
}
if (psbtObject.TryGetEstimatedFeeRate(out var feeRate))
{
vm.FeeRate = feeRate.ToString();
}
var sanityErrors = psbtObject.CheckSanity();
if (sanityErrors.Count != 0)
{
vm.SetErrors(sanityErrors);
}
else if (!psbtObject.IsAllFinalized() && !psbtObject.TryFinalize(out var errors))
{
vm.SetErrors(errors);
}
}
public async Task <IActionResult> Submit(string cryptoCode)
{
var network = _btcPayNetworkProvider.GetNetwork <BTCPayNetwork>(cryptoCode);
if (network == null)
{
return(BadRequest(CreatePayjoinError(400, "invalid-network", "Incorrect network")));
}
var explorer = _explorerClientProvider.GetExplorerClient(network);
if (Request.ContentLength is long length)
{
if (length > 1_000_000)
{
return(this.StatusCode(413,
CreatePayjoinError(413, "payload-too-large", "The transaction is too big to be processed")));
}
}
else
{
return(StatusCode(411,
CreatePayjoinError(411, "missing-content-length",
"The http header Content-Length should be filled")));
}
string rawBody;
using (StreamReader reader = new StreamReader(Request.Body, Encoding.UTF8))
{
rawBody = (await reader.ReadToEndAsync()) ?? string.Empty;
}
Transaction originalTx = null;
FeeRate originalFeeRate = null;
bool psbtFormat = true;
if (!PSBT.TryParse(rawBody, network.NBitcoinNetwork, out var psbt))
{
psbtFormat = false;
if (!Transaction.TryParse(rawBody, network.NBitcoinNetwork, out var tx))
{
return(BadRequest(CreatePayjoinError(400, "invalid-format", "invalid transaction or psbt")));
}
originalTx = tx;
psbt = PSBT.FromTransaction(tx, network.NBitcoinNetwork);
psbt = (await explorer.UpdatePSBTAsync(new UpdatePSBTRequest()
{
PSBT = psbt
})).PSBT;
for (int i = 0; i < tx.Inputs.Count; i++)
{
psbt.Inputs[i].FinalScriptSig = tx.Inputs[i].ScriptSig;
psbt.Inputs[i].FinalScriptWitness = tx.Inputs[i].WitScript;
}
}
else
{
if (!psbt.IsAllFinalized())
{
return(BadRequest(CreatePayjoinError(400, "psbt-not-finalized", "The PSBT should be finalized")));
}
originalTx = psbt.ExtractTransaction();
}
async Task BroadcastNow()
{
await _explorerClientProvider.GetExplorerClient(network).BroadcastAsync(originalTx);
}
var sendersInputType = psbt.GetInputsScriptPubKeyType();
if (sendersInputType is null)
{
return(BadRequest(CreatePayjoinError(400, "unsupported-inputs", "Payjoin only support segwit inputs (of the same type)")));
}
if (psbt.CheckSanity() is var errors && errors.Count != 0)
{
return(BadRequest(CreatePayjoinError(400, "insane-psbt", $"This PSBT is insane ({errors[0]})")));
}
if (!psbt.TryGetEstimatedFeeRate(out originalFeeRate))
{
return(BadRequest(CreatePayjoinError(400, "need-utxo-information",
"You need to provide Witness UTXO information to the PSBT.")));
}
// This is actually not a mandatory check, but we don't want implementers
// to leak global xpubs
if (psbt.GlobalXPubs.Any())
{
return(BadRequest(CreatePayjoinError(400, "leaking-data",
"GlobalXPubs should not be included in the PSBT")));
}
if (psbt.Outputs.Any(o => o.HDKeyPaths.Count != 0) || psbt.Inputs.Any(o => o.HDKeyPaths.Count != 0))
{
return(BadRequest(CreatePayjoinError(400, "leaking-data",
"Keypath information should not be included in the PSBT")));
}
if (psbt.Inputs.Any(o => !o.IsFinalized()))
{
return(BadRequest(CreatePayjoinError(400, "psbt-not-finalized", "The PSBT Should be finalized")));
}
////////////
var mempool = await explorer.BroadcastAsync(originalTx, true);
if (!mempool.Success)
{
return(BadRequest(CreatePayjoinError(400, "invalid-transaction",
$"Provided transaction isn't mempool eligible {mempool.RPCCodeMessage}")));
}
var paymentMethodId = new PaymentMethodId(network.CryptoCode, PaymentTypes.BTCLike);
bool paidSomething = false;
Money due = null;
Dictionary <OutPoint, UTXO> selectedUTXOs = new Dictionary <OutPoint, UTXO>();
async Task UnlockUTXOs()
{
await _payJoinRepository.TryUnlock(selectedUTXOs.Select(o => o.Key).ToArray());
}
PSBTOutput originalPaymentOutput = null;
BitcoinAddress paymentAddress = null;
InvoiceEntity invoice = null;
DerivationSchemeSettings derivationSchemeSettings = null;
foreach (var output in psbt.Outputs)
{
var key = output.ScriptPubKey.Hash + "#" + network.CryptoCode.ToUpperInvariant();
invoice = (await _invoiceRepository.GetInvoicesFromAddresses(new[] { key })).FirstOrDefault();
if (invoice is null)
{
continue;
}
derivationSchemeSettings = invoice.GetSupportedPaymentMethod <DerivationSchemeSettings>(paymentMethodId)
.SingleOrDefault();
if (derivationSchemeSettings is null)
{
continue;
}
var receiverInputsType = derivationSchemeSettings.AccountDerivation.ScriptPubKeyType();
if (!PayjoinClient.SupportedFormats.Contains(receiverInputsType))
{
//this should never happen, unless the store owner changed the wallet mid way through an invoice
return(StatusCode(500, CreatePayjoinError(500, "unavailable", $"This service is unavailable for now")));
}
if (sendersInputType != receiverInputsType)
{
return(StatusCode(503,
CreatePayjoinError(503, "out-of-utxos",
"We do not have any UTXO available for making a payjoin with the sender's inputs type")));
}
var paymentMethod = invoice.GetPaymentMethod(paymentMethodId);
var paymentDetails =
paymentMethod.GetPaymentMethodDetails() as Payments.Bitcoin.BitcoinLikeOnChainPaymentMethod;
if (paymentDetails is null || !paymentDetails.PayjoinEnabled)
{
continue;
}
if (invoice.GetAllBitcoinPaymentData().Any())
{
return(UnprocessableEntity(CreatePayjoinError(422, "already-paid",
$"The invoice this PSBT is paying has already been partially or completely paid")));
}
paidSomething = true;
due = paymentMethod.Calculate().TotalDue - output.Value;
if (due > Money.Zero)
{
break;
}
if (!await _payJoinRepository.TryLockInputs(originalTx.Inputs.Select(i => i.PrevOut).ToArray()))
{
return(BadRequest(CreatePayjoinError(400, "inputs-already-used",
"Some of those inputs have already been used to make payjoin transaction")));
}
var utxos = (await explorer.GetUTXOsAsync(derivationSchemeSettings.AccountDerivation))
.GetUnspentUTXOs(false);
// In case we are paying ourselves, be need to make sure
// we can't take spent outpoints.
var prevOuts = originalTx.Inputs.Select(o => o.PrevOut).ToHashSet();
utxos = utxos.Where(u => !prevOuts.Contains(u.Outpoint)).ToArray();
Array.Sort(utxos, UTXODeterministicComparer.Instance);
foreach (var utxo in await SelectUTXO(network, utxos, output.Value,
psbt.Outputs.Where(o => o.Index != output.Index).Select(o => o.Value).ToArray()))
{
selectedUTXOs.Add(utxo.Outpoint, utxo);
}
originalPaymentOutput = output;
paymentAddress = paymentDetails.GetDepositAddress(network.NBitcoinNetwork);
break;
}
if (!paidSomething)
{
return(BadRequest(CreatePayjoinError(400, "invoice-not-found",
"This transaction does not pay any invoice with payjoin")));
}
if (due is null || due > Money.Zero)
{
return(BadRequest(CreatePayjoinError(400, "invoice-not-fully-paid",
"The transaction must pay the whole invoice")));
}
if (selectedUTXOs.Count == 0)
{
await BroadcastNow();
return(StatusCode(503,
CreatePayjoinError(503, "out-of-utxos",
"We do not have any UTXO available for making a payjoin for now")));
}
var originalPaymentValue = originalPaymentOutput.Value;
await _broadcaster.Schedule(DateTimeOffset.UtcNow + TimeSpan.FromMinutes(1.0), originalTx, network);
//check if wallet of store is configured to be hot wallet
var extKeyStr = await explorer.GetMetadataAsync <string>(
derivationSchemeSettings.AccountDerivation,
WellknownMetadataKeys.AccountHDKey);
if (extKeyStr == null)
{
// This should not happen, as we check the existance of private key before creating invoice with payjoin
await UnlockUTXOs();
await BroadcastNow();
return(StatusCode(500, CreatePayjoinError(500, "unavailable", $"This service is unavailable for now")));
}
Money contributedAmount = Money.Zero;
var newTx = originalTx.Clone();
var ourNewOutput = newTx.Outputs[originalPaymentOutput.Index];
HashSet <TxOut> isOurOutput = new HashSet <TxOut>();
isOurOutput.Add(ourNewOutput);
foreach (var selectedUTXO in selectedUTXOs.Select(o => o.Value))
{
contributedAmount += (Money)selectedUTXO.Value;
newTx.Inputs.Add(selectedUTXO.Outpoint);
}
ourNewOutput.Value += contributedAmount;
var minRelayTxFee = this._dashboard.Get(network.CryptoCode).Status.BitcoinStatus?.MinRelayTxFee ??
new FeeRate(1.0m);
// Probably receiving some spare change, let's add an output to make
// it looks more like a normal transaction
if (newTx.Outputs.Count == 1)
{
var change = await explorer.GetUnusedAsync(derivationSchemeSettings.AccountDerivation, DerivationFeature.Change);
var randomChangeAmount = RandomUtils.GetUInt64() % (ulong)contributedAmount.Satoshi;
// Randomly round the amount to make the payment output look like a change output
var roundMultiple = (ulong)Math.Pow(10, (ulong)Math.Log10(randomChangeAmount));
while (roundMultiple > 1_000UL)
{
if (RandomUtils.GetUInt32() % 2 == 0)
{
roundMultiple = roundMultiple / 10;
}
else
{
randomChangeAmount = (randomChangeAmount / roundMultiple) * roundMultiple;
break;
}
}
var fakeChange = newTx.Outputs.CreateNewTxOut(randomChangeAmount, change.ScriptPubKey);
if (fakeChange.IsDust(minRelayTxFee))
{
randomChangeAmount = fakeChange.GetDustThreshold(minRelayTxFee);
fakeChange.Value = randomChangeAmount;
}
if (randomChangeAmount < contributedAmount)
{
ourNewOutput.Value -= fakeChange.Value;
newTx.Outputs.Add(fakeChange);
isOurOutput.Add(fakeChange);
}
}
var rand = new Random();
Utils.Shuffle(newTx.Inputs, rand);
Utils.Shuffle(newTx.Outputs, rand);
// Remove old signatures as they are not valid anymore
foreach (var input in newTx.Inputs)
{
input.WitScript = WitScript.Empty;
}
Money ourFeeContribution = Money.Zero;
// We need to adjust the fee to keep a constant fee rate
var txBuilder = network.NBitcoinNetwork.CreateTransactionBuilder();
txBuilder.AddCoins(psbt.Inputs.Select(i => i.GetSignableCoin()));
txBuilder.AddCoins(selectedUTXOs.Select(o => o.Value.AsCoin(derivationSchemeSettings.AccountDerivation)));
Money expectedFee = txBuilder.EstimateFees(newTx, originalFeeRate);
Money actualFee = newTx.GetFee(txBuilder.FindSpentCoins(newTx));
Money additionalFee = expectedFee - actualFee;
if (additionalFee > Money.Zero)
{
// If the user overpaid, taking fee on our output (useful if sender dump a full UTXO for privacy)
for (int i = 0; i < newTx.Outputs.Count && additionalFee > Money.Zero && due < Money.Zero; i++)
{
if (isOurOutput.Contains(newTx.Outputs[i]))
{
var outputContribution = Money.Min(additionalFee, -due);
outputContribution = Money.Min(outputContribution,
newTx.Outputs[i].Value - newTx.Outputs[i].GetDustThreshold(minRelayTxFee));
newTx.Outputs[i].Value -= outputContribution;
additionalFee -= outputContribution;
due += outputContribution;
ourFeeContribution += outputContribution;
}
}
// The rest, we take from user's change
for (int i = 0; i < newTx.Outputs.Count && additionalFee > Money.Zero; i++)
{
if (!isOurOutput.Contains(newTx.Outputs[i]))
{
var outputContribution = Money.Min(additionalFee, newTx.Outputs[i].Value);
outputContribution = Money.Min(outputContribution,
newTx.Outputs[i].Value - newTx.Outputs[i].GetDustThreshold(minRelayTxFee));
newTx.Outputs[i].Value -= outputContribution;
additionalFee -= outputContribution;
}
}
if (additionalFee > Money.Zero)
{
// We could not pay fully the additional fee, however, as long as
// we are not under the relay fee, it should be OK.
var newVSize = txBuilder.EstimateSize(newTx, true);
var newFeePaid = newTx.GetFee(txBuilder.FindSpentCoins(newTx));
if (new FeeRate(newFeePaid, newVSize) < minRelayTxFee)
{
await UnlockUTXOs();
await BroadcastNow();
return(UnprocessableEntity(CreatePayjoinError(422, "not-enough-money",
"Not enough money is sent to pay for the additional payjoin inputs")));
}
}
}
var accountKey = ExtKey.Parse(extKeyStr, network.NBitcoinNetwork);
var newPsbt = PSBT.FromTransaction(newTx, network.NBitcoinNetwork);
foreach (var selectedUtxo in selectedUTXOs.Select(o => o.Value))
{
var signedInput = newPsbt.Inputs.FindIndexedInput(selectedUtxo.Outpoint);
var coin = selectedUtxo.AsCoin(derivationSchemeSettings.AccountDerivation);
signedInput.UpdateFromCoin(coin);
var privateKey = accountKey.Derive(selectedUtxo.KeyPath).PrivateKey;
signedInput.Sign(privateKey);
signedInput.FinalizeInput();
newTx.Inputs[signedInput.Index].WitScript = newPsbt.Inputs[(int)signedInput.Index].FinalScriptWitness;
}
// Add the transaction to the payments with a confirmation of -1.
// This will make the invoice paid even if the user do not
// broadcast the payjoin.
var originalPaymentData = new BitcoinLikePaymentData(paymentAddress,
originalPaymentOutput.Value,
new OutPoint(originalTx.GetHash(), originalPaymentOutput.Index),
originalTx.RBF);
originalPaymentData.ConfirmationCount = -1;
originalPaymentData.PayjoinInformation = new PayjoinInformation()
{
CoinjoinTransactionHash = newPsbt.GetGlobalTransaction().GetHash(),
CoinjoinValue = originalPaymentValue - ourFeeContribution,
ContributedOutPoints = selectedUTXOs.Select(o => o.Key).ToArray()
};
var payment = await _invoiceRepository.AddPayment(invoice.Id, DateTimeOffset.UtcNow, originalPaymentData, network, true);
if (payment is null)
{
await UnlockUTXOs();
await BroadcastNow();
return(UnprocessableEntity(CreatePayjoinError(422, "already-paid",
$"The original transaction has already been accounted")));
}
await _btcPayWalletProvider.GetWallet(network).SaveOffchainTransactionAsync(originalTx);
_eventAggregator.Publish(new InvoiceEvent(invoice, 1002, InvoiceEvent.ReceivedPayment)
{
Payment = payment
});
if (psbtFormat && HexEncoder.IsWellFormed(rawBody))
{
return(Ok(newPsbt.ToHex()));
}
else if (psbtFormat)
{
return(Ok(newPsbt.ToBase64()));
}
else
{
return(Ok(newTx.ToHex()));
}
}
private async Task <PSBT> GetPayjoinProposedTX(BitcoinUrlBuilder bip21, PSBT psbt, DerivationSchemeSettings derivationSchemeSettings, BTCPayNetwork btcPayNetwork, CancellationToken cancellationToken)
{
var cloned = psbt.Clone();
cloned = cloned.Finalize();
await _broadcaster.Schedule(DateTimeOffset.UtcNow + TimeSpan.FromMinutes(2.0), cloned.ExtractTransaction(), btcPayNetwork);
using var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
cts.CancelAfter(TimeSpan.FromSeconds(30));
return(await _payjoinClient.RequestPayjoin(bip21, new PayjoinWallet(derivationSchemeSettings), psbt, cts.Token));
}