private async Task UpdatePSBTCore(UpdatePSBTRequest update, NBXplorerNetwork network)
{
var repo = RepositoryProvider.GetRepository(network);
var rpc = Waiters.GetWaiter(network);
await UpdateInputsUTXO(update, repo, rpc);
if (update.DerivationScheme is DerivationStrategyBase)
{
foreach (var extpub in update.DerivationScheme.GetExtPubKeys().Select(e => e.GetWif(network.NBitcoinNetwork)))
{
update.PSBT.GlobalXPubs.AddOrReplace(extpub, new RootedKeyPath(extpub, new KeyPath()));
}
await UpdateHDKeyPathsWitnessAndRedeem(update, repo);
}
foreach (var input in update.PSBT.Inputs)
{
input.TrySlimUTXO();
}
if (update.RebaseKeyPaths != null)
{
foreach (var rebase in update.RebaseKeyPaths)
{
var rootedKeyPath = rebase.GetRootedKeyPath();
if (rootedKeyPath == null)
{
throw new NBXplorerException(new NBXplorerError(400, "missing-parameter", "rebaseKeyPaths[].rootedKeyPath is missing"));
}
update.PSBT.RebaseKeyPaths(rebase.AccountKey, rootedKeyPath);
}
}
}
private async Task UpdatePSBTCore(UpdatePSBTRequest update, NBXplorerNetwork network)
{
var repo = RepositoryProvider.GetRepository(network);
await UpdateInputsUTXO(update, repo);
if (update.DerivationScheme is DerivationStrategyBase)
{
await UpdateHDKeyPathsWitnessAndRedeem(update, repo);
}
foreach (var input in update.PSBT.Inputs)
{
input.TrySlimUTXO();
}
if (update.RebaseKeyPaths != null)
{
foreach (var rebase in update.RebaseKeyPaths)
{
var rootedKeyPath = rebase.GetRootedKeyPath();
if (rootedKeyPath == null)
{
throw new NBXplorerException(new NBXplorerError(400, "missing-parameter", "rebaseKeyPaths[].rootedKeyPath is missing"));
}
update.PSBT.RebaseKeyPaths(rebase.AccountKey, rootedKeyPath);
}
}
}
private async Task UpdatePSBTCore(UpdatePSBTRequest update, NBXplorerNetwork network)
{
var repo = RepositoryProvider.GetRepository(network);
var rpc = Waiters.GetWaiter(network);
await UpdateUTXO(update, repo, rpc);
if (update.DerivationScheme is DerivationStrategyBase derivationScheme)
{
if (update.IncludeGlobalXPub is true)
{
foreach (var extpub in derivationScheme.GetExtPubKeys().Select(e => e.GetWif(network.NBitcoinNetwork)))
{
update.PSBT.GlobalXPubs.AddOrReplace(extpub, new RootedKeyPath(extpub, new KeyPath()));
}
}
await UpdateHDKeyPathsWitnessAndRedeem(update, repo);
}
if (!update.AlwaysIncludeNonWitnessUTXO)
{
foreach (var input in update.PSBT.Inputs)
{
input.TrySlimUTXO();
}
}
HashSet <PubKey> rebased = new HashSet <PubKey>();
if (update.RebaseKeyPaths != null)
{
if (update.RebaseKeyPaths.Any(r => r.AccountKey is null))
{
throw new NBXplorerException(new NBXplorerError(400, "missing-parameter", "rebaseKeyPaths[].accountKey is missing"));
}
foreach (var rebase in update.RebaseKeyPaths.Where(r => rebased.Add(r.AccountKey.GetPublicKey())))
{
if (rebase.AccountKeyPath == null)
{
throw new NBXplorerException(new NBXplorerError(400, "missing-parameter", "rebaseKeyPaths[].accountKeyPath is missing"));
}
update.PSBT.RebaseKeyPaths(rebase.AccountKey, rebase.AccountKeyPath);
}
}
if (update.DerivationScheme is DerivationStrategyBase derivationScheme2)
{
var accountKeyPath = await repo.GetMetadata <RootedKeyPath>(
new DerivationSchemeTrackedSource(derivationScheme2), WellknownMetadataKeys.AccountKeyPath);
if (accountKeyPath != null)
{
foreach (var pubkey in derivationScheme2.GetExtPubKeys().Where(p => rebased.Add(p.PubKey)))
{
update.PSBT.RebaseKeyPaths(pubkey, accountKeyPath);
}
}
}
}
public Task <UpdatePSBTResponse> UpdatePSBTAsync(UpdatePSBTRequest request, CancellationToken cancellation = default)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
return(this.SendAsync <UpdatePSBTResponse>(HttpMethod.Post, request, "v1/cryptos/{0}/psbt/update", new object[] { CryptoCode }, cancellation));
}
private async Task UpdateUTXO(UpdatePSBTRequest update, Repository repo, BitcoinDWaiter rpc)
{
AnnotatedTransactionCollection txs = null;
// First, we check for data in our history
foreach (var input in update.PSBT.Inputs.Where(NeedUTXO))
{
txs = txs ?? await GetAnnotatedTransactions(repo, ChainProvider.GetChain(repo.Network), new DerivationSchemeTrackedSource(update.DerivationScheme));
if (txs.GetByTxId(input.PrevOut.Hash) is AnnotatedTransaction tx)
{
if (!tx.Record.Key.IsPruned)
{
input.NonWitnessUtxo = tx.Record.Transaction;
}
else
{
input.WitnessUtxo = tx.Record.ReceivedCoins.FirstOrDefault(c => c.Outpoint.N == input.Index)?.TxOut;
}
}
}
// then, we search data in the saved transactions
await Task.WhenAll(update.PSBT.Inputs
.Where(NeedUTXO)
.Select(async(input) =>
{
// If this is not segwit, or we are unsure of it, let's try to grab from our saved transactions
if (input.NonWitnessUtxo == null)
{
var prev = await repo.GetSavedTransactions(input.PrevOut.Hash);
if (prev.FirstOrDefault() is Repository.SavedTransaction saved)
{
input.NonWitnessUtxo = saved.Transaction;
}
}
}).ToArray());
// finally, we check with rpc's txindex
if (rpc?.RPCAvailable is true && rpc?.HasTxIndex is true)
{
var batch = rpc.RPC.PrepareBatch();
var getTransactions = Task.WhenAll(update.PSBT.Inputs
.Where(NeedUTXO)
.Where(input => input.NonWitnessUtxo == null)
.Select(async input =>
{
var tx = await batch.GetRawTransactionAsync(input.PrevOut.Hash, false);
if (tx != null)
{
input.NonWitnessUtxo = tx;
}
}).ToArray());
await batch.SendBatchAsync();
await getTransactions;
}
}
private static async Task UpdateHDKeyPathsWitnessAndRedeem(UpdatePSBTRequest update, Repository repo)
{
var strategy = update.DerivationScheme;
var pubkeys = strategy.GetExtPubKeys().Select(p => p.AsHDKeyCache()).ToArray();
var keyInfosByScriptPubKey = new Dictionary <Script, KeyPathInformation>();
var scriptPubKeys = update.PSBT.Outputs.OfType <PSBTCoin>().Concat(update.PSBT.Inputs)
.Where(o => !o.HDKeyPaths.Any())
.Select(o => o.GetCoin()?.ScriptPubKey)
.Where(s => s != null).ToArray();
foreach (var keyInfos in (await repo.GetKeyInformations(scriptPubKeys)))
{
var keyInfo = keyInfos.Value.FirstOrDefault(k => k.DerivationStrategy == strategy);
if (keyInfo != null)
{
keyInfosByScriptPubKey.TryAdd(keyInfo.ScriptPubKey, keyInfo);
}
}
var fps = new Dictionary <PubKey, HDFingerprint>();
foreach (var pubkey in pubkeys)
{
// We derive everything the fastest way possible on multiple cores
pubkey.Derive(keyInfosByScriptPubKey.Select(s => s.Value.KeyPath).ToArray());
fps.TryAdd(pubkey.GetPublicKey(), pubkey.GetPublicKey().GetHDFingerPrint());
}
List <Script> redeems = new List <Script>();
foreach (var c in update.PSBT.Outputs.OfType <PSBTCoin>().Concat(update.PSBT.Inputs))
{
var script = c.GetCoin()?.ScriptPubKey;
if (script != null &&
keyInfosByScriptPubKey.TryGetValue(script, out var keyInfo))
{
foreach (var pubkey in pubkeys)
{
var childPubKey = pubkey.Derive(keyInfo.KeyPath);
NBitcoin.Extensions.AddOrReplace(c.HDKeyPaths, childPubKey.GetPublicKey(), new RootedKeyPath(fps[pubkey.GetPublicKey()], keyInfo.KeyPath));
if (keyInfo.Redeem != null)
{
redeems.Add(keyInfo.Redeem);
}
}
}
}
if (redeems.Count != 0)
{
update.PSBT.AddScripts(redeems.ToArray());
}
}
private static async Task UpdateInputsUTXO(UpdatePSBTRequest update, Repository repo, BitcoinDWaiter rpc)
{
await Task.WhenAll(update.PSBT.Inputs
.Where(NeedNonWitnessUtxo)
.Where(NotFinalized)
.Select(async(input) =>
{
// If this is not segwit, or we are unsure of it, let's try to grab from our saved transactions
if (input.NonWitnessUtxo == null)
{
var prev = await repo.GetSavedTransactions(input.PrevOut.Hash);
if (prev.FirstOrDefault() is Repository.SavedTransaction saved)
{
input.NonWitnessUtxo = saved.Transaction;
}
}
// Maybe we don't have the saved transaction, but we have the WitnessUTXO from the derivation scheme UTXOs
if (input.NonWitnessUtxo == null)
{
var tx = (await repo.GetTransactions(new DerivationSchemeTrackedSource(update.DerivationScheme), input.PrevOut.Hash)).FirstOrDefault();
if (tx != null)
{
input.NonWitnessUtxo = tx.Transaction;
}
}
}).ToArray());
if (rpc?.RPCAvailable is true && rpc?.HasTxIndex is true)
{
var batch = rpc.RPC.PrepareBatch();
var getTransactions = Task.WhenAll(update.PSBT.Inputs
.Where(NeedNonWitnessUtxo)
.Where(NotFinalized)
.Where(input => input.NonWitnessUtxo == null)
.Select(async input =>
{
var tx = await batch.GetRawTransactionAsync(input.PrevOut.Hash, false);
if (tx != null)
{
input.NonWitnessUtxo = tx;
}
}).ToArray());
await batch.SendBatchAsync();
await getTransactions;
}
}
private static async Task UpdateInputsUTXO(UpdatePSBTRequest update, Repository repo)
{
await Task.WhenAll(update.PSBT.Inputs
.Select(async(input) =>
{
var isWitness = (input.GetSignableCoin() ?? input.GetCoin())?.GetHashVersion() is HashVersion.Witness;
// We are sure we are using segwit, so no need to fetch anything else
if (isWitness)
{
return;
}
// If this is not segwit, or we are unsure of it, let's try to grab from our saved transactions
if (input.NonWitnessUtxo == null)
{
var prev = await repo.GetSavedTransactions(input.PrevOut.Hash);
if (prev.FirstOrDefault() is Repository.SavedTransaction saved)
{
input.NonWitnessUtxo = saved.Transaction;
}
}
// Maybe we don't have the saved transaction, but we have the WitnessUTXO from the derivation scheme UTXOs
if (input.NonWitnessUtxo == null && input.WitnessUtxo == null && update.DerivationScheme != null)
{
var tx = (await repo.GetTransactions(new DerivationSchemeTrackedSource(update.DerivationScheme), input.PrevOut.Hash)).FirstOrDefault();
if (tx != null)
{
var output = tx.GetReceivedOutputs().FirstOrDefault(o => o.Index == input.PrevOut.N);
if (output != null)
{
input.WitnessUtxo = repo.Network.NBitcoinNetwork.Consensus.ConsensusFactory.CreateTxOut();
input.WitnessUtxo.ScriptPubKey = output.ScriptPubKey;
input.WitnessUtxo.Value = output.Value;
}
}
}
}).ToArray());
}
public UpdatePSBTResponse UpdatePSBT(UpdatePSBTRequest request, CancellationToken cancellation = default)
{
return(UpdatePSBTAsync(request, cancellation).GetAwaiter().GetResult());
}
public async Task <IActionResult> CreatePSBT(
[ModelBinder(BinderType = typeof(NetworkModelBinder))]
NBXplorerNetwork network,
[ModelBinder(BinderType = typeof(DerivationStrategyModelBinder))]
DerivationStrategyBase strategy,
[FromBody]
JObject body)
{
if (body == null)
{
throw new ArgumentNullException(nameof(body));
}
CreatePSBTRequest request = ParseJObject <CreatePSBTRequest>(body, network);
if (strategy == null)
{
throw new ArgumentNullException(nameof(strategy));
}
var repo = RepositoryProvider.GetRepository(network);
var txBuilder = request.Seed is int s?network.NBitcoinNetwork.CreateTransactionBuilder(s)
: network.NBitcoinNetwork.CreateTransactionBuilder();
CreatePSBTSuggestions suggestions = null;
if (!(request.DisableFingerprintRandomization is true) &&
fingerprintService.GetDistribution(network) is FingerprintDistribution distribution)
{
suggestions ??= new CreatePSBTSuggestions();
var known = new List <(Fingerprint feature, bool value)>();
if (request.RBF is bool rbf)
{
known.Add((Fingerprint.RBF, rbf));
}
if (request.DiscourageFeeSniping is bool feeSnipping)
{
known.Add((Fingerprint.FeeSniping, feeSnipping));
}
if (request.LockTime is LockTime l)
{
if (l == LockTime.Zero)
{
known.Add((Fingerprint.TimelockZero, true));
}
}
if (request.Version is uint version)
{
if (version == 1)
{
known.Add((Fingerprint.V1, true));
}
if (version == 2)
{
known.Add((Fingerprint.V2, true));
}
}
known.Add((Fingerprint.SpendFromMixed, false));
known.Add((Fingerprint.SequenceMixed, false));
if (strategy is DirectDerivationStrategy direct)
{
if (direct.Segwit)
{
known.Add((Fingerprint.SpendFromP2WPKH, true));
}
else
{
known.Add((Fingerprint.SpendFromP2PKH, true));
}
}
else
{
// TODO: What if multisig? For now we consider it p2wpkh
known.Add((Fingerprint.SpendFromP2SHP2WPKH, true));
}
Fingerprint fingerprint = distribution.PickFingerprint(txBuilder.ShuffleRandom);
try
{
fingerprint = distribution.KnowingThat(known.ToArray())
.PickFingerprint(txBuilder.ShuffleRandom);
}
catch (InvalidOperationException)
{
}
request.RBF ??= fingerprint.HasFlag(Fingerprint.RBF);
request.DiscourageFeeSniping ??= fingerprint.HasFlag(Fingerprint.FeeSniping);
if (request.LockTime is null && fingerprint.HasFlag(Fingerprint.TimelockZero))
{
request.LockTime = new LockTime(0);
}
if (request.Version is null && fingerprint.HasFlag(Fingerprint.V1))
{
request.Version = 1;
}
if (request.Version is null && fingerprint.HasFlag(Fingerprint.V2))
{
request.Version = 2;
}
suggestions.ShouldEnforceLowR = fingerprint.HasFlag(Fingerprint.LowR);
}
var waiter = Waiters.GetWaiter(network);
if (waiter.NetworkInfo?.GetRelayFee() is FeeRate feeRate)
{
txBuilder.StandardTransactionPolicy.MinRelayTxFee = feeRate;
}
txBuilder.OptInRBF = !(request.RBF is false);
if (request.LockTime is LockTime lockTime)
{
txBuilder.SetLockTime(lockTime);
}
// Discourage fee sniping.
//
// For a large miner the value of the transactions in the best block and
// the mempool can exceed the cost of deliberately attempting to mine two
// blocks to orphan the current best block. By setting nLockTime such that
// only the next block can include the transaction, we discourage this
// practice as the height restricted and limited blocksize gives miners
// considering fee sniping fewer options for pulling off this attack.
//
// A simple way to think about this is from the wallet's point of view we
// always want the blockchain to move forward. By setting nLockTime this
// way we're basically making the statement that we only want this
// transaction to appear in the next block; we don't want to potentially
// encourage reorgs by allowing transactions to appear at lower heights
// than the next block in forks of the best chain.
//
// Of course, the subsidy is high enough, and transaction volume low
// enough, that fee sniping isn't a problem yet, but by implementing a fix
// now we ensure code won't be written that makes assumptions about
// nLockTime that preclude a fix later.
else if (!(request.DiscourageFeeSniping is false))
{
if (waiter.State is BitcoinDWaiterState.Ready)
{
int blockHeight = ChainProvider.GetChain(network).Height;
// Secondly occasionally randomly pick a nLockTime even further back, so
// that transactions that are delayed after signing for whatever reason,
// e.g. high-latency mix networks and some CoinJoin implementations, have
// better privacy.
if (txBuilder.ShuffleRandom.Next(0, 10) == 0)
{
blockHeight = Math.Max(0, blockHeight - txBuilder.ShuffleRandom.Next(0, 100));
}
txBuilder.SetLockTime(new LockTime(blockHeight));
}
else
{
txBuilder.SetLockTime(new LockTime(0));
}
}
var utxos = (await GetUTXOs(network.CryptoCode, strategy, null)).As <UTXOChanges>().GetUnspentUTXOs(request.MinConfirmations);
var availableCoinsByOutpoint = utxos.ToDictionary(o => o.Outpoint);
if (request.IncludeOnlyOutpoints != null)
{
var includeOnlyOutpoints = request.IncludeOnlyOutpoints.ToHashSet();
availableCoinsByOutpoint = availableCoinsByOutpoint.Where(c => includeOnlyOutpoints.Contains(c.Key)).ToDictionary(o => o.Key, o => o.Value);
}
if (request.ExcludeOutpoints?.Any() is true)
{
var excludedOutpoints = request.ExcludeOutpoints.ToHashSet();
availableCoinsByOutpoint = availableCoinsByOutpoint.Where(c => !excludedOutpoints.Contains(c.Key)).ToDictionary(o => o.Key, o => o.Value);
}
if (request.MinValue != null)
{
availableCoinsByOutpoint = availableCoinsByOutpoint.Where(c => request.MinValue >= (Money)c.Value.Value).ToDictionary(o => o.Key, o => o.Value);
}
ICoin[] coins = null;
if (strategy.GetDerivation().Redeem != null)
{
// We need to add the redeem script to the coins
var hdKeys = strategy.AsHDRedeemScriptPubKey().AsHDKeyCache();
var arr = availableCoinsByOutpoint.Values.ToArray();
coins = new ICoin[arr.Length];
// Can be very intense CPU wise
Parallel.For(0, coins.Length, i =>
{
coins[i] = ((Coin)arr[i].AsCoin()).ToScriptCoin(hdKeys.Derive(arr[i].KeyPath).ScriptPubKey);
});
}
else
{
coins = availableCoinsByOutpoint.Values.Select(v => v.AsCoin()).ToArray();
}
txBuilder.AddCoins(coins);
foreach (var dest in request.Destinations)
{
if (dest.SweepAll)
{
try
{
txBuilder.SendAll(dest.Destination);
}
catch
{
throw new NBXplorerException(new NBXplorerError(400, "not-enough-funds", "You can't sweep funds, because you don't have any."));
}
}
else
{
txBuilder.Send(dest.Destination, dest.Amount);
if (dest.SubstractFees)
{
try
{
txBuilder.SubtractFees();
}
catch
{
throw new NBXplorerException(new NBXplorerError(400, "not-enough-funds", "You can't substract fee on this destination, because not enough money was sent to it"));
}
}
}
}
(Script ScriptPubKey, KeyPath KeyPath)change = (null, null);
bool hasChange = false;
if (request.ExplicitChangeAddress == null)
{
var keyInfo = await repo.GetUnused(strategy, DerivationFeature.Change, 0, false);
change = (keyInfo.ScriptPubKey, keyInfo.KeyPath);
}
else
{
// The provided explicit change might have a known keyPath, let's change for it
KeyPath keyPath = null;
var keyInfos = await repo.GetKeyInformations(new[] { request.ExplicitChangeAddress.ScriptPubKey });
if (keyInfos.TryGetValue(request.ExplicitChangeAddress.ScriptPubKey, out var kis))
{
keyPath = kis.FirstOrDefault(k => k.DerivationStrategy == strategy)?.KeyPath;
}
change = (request.ExplicitChangeAddress.ScriptPubKey, keyPath);
}
txBuilder.SetChange(change.ScriptPubKey);
PSBT psbt = null;
try
{
if (request.FeePreference?.ExplicitFeeRate is FeeRate explicitFeeRate)
{
txBuilder.SendEstimatedFees(explicitFeeRate);
}
else if (request.FeePreference?.BlockTarget is int blockTarget)
{
try
{
var rate = await GetFeeRate(blockTarget, network.CryptoCode);
txBuilder.SendEstimatedFees(rate.FeeRate);
}
catch (NBXplorerException e) when(e.Error.Code == "fee-estimation-unavailable" && request.FeePreference?.FallbackFeeRate is FeeRate fallbackFeeRate)
{
txBuilder.SendEstimatedFees(fallbackFeeRate);
}
}
else if (request.FeePreference?.ExplicitFee is Money explicitFee)
{
txBuilder.SendFees(explicitFee);
}
else
{
try
{
var rate = await GetFeeRate(1, network.CryptoCode);
txBuilder.SendEstimatedFees(rate.FeeRate);
}
catch (NBXplorerException e) when(e.Error.Code == "fee-estimation-unavailable" && request.FeePreference?.FallbackFeeRate is FeeRate fallbackFeeRate)
{
txBuilder.SendEstimatedFees(fallbackFeeRate);
}
}
psbt = txBuilder.BuildPSBT(false);
hasChange = psbt.Outputs.Any(o => o.ScriptPubKey == change.ScriptPubKey);
}
catch (NotEnoughFundsException)
{
throw new NBXplorerException(new NBXplorerError(400, "not-enough-funds", "Not enough funds for doing this transaction"));
}
// We made sure we can build the PSBT, so now we can reserve the change address if we need to
if (hasChange && request.ExplicitChangeAddress == null && request.ReserveChangeAddress)
{
var derivation = await repo.GetUnused(strategy, DerivationFeature.Change, 0, true);
// In most of the time, this is the same as previously, so no need to rebuild PSBT
if (derivation.ScriptPubKey != change.ScriptPubKey)
{
change = (derivation.ScriptPubKey, derivation.KeyPath);
txBuilder.SetChange(change.ScriptPubKey);
psbt = txBuilder.BuildPSBT(false);
}
}
var tx = psbt.GetOriginalTransaction();
if (request.Version is uint v)
{
tx.Version = v;
}
psbt = txBuilder.CreatePSBTFrom(tx, false, SigHash.All);
var update = new UpdatePSBTRequest()
{
DerivationScheme = strategy,
PSBT = psbt,
RebaseKeyPaths = request.RebaseKeyPaths,
AlwaysIncludeNonWitnessUTXO = request.AlwaysIncludeNonWitnessUTXO,
IncludeGlobalXPub = request.IncludeGlobalXPub
};
await UpdatePSBTCore(update, network);
var resp = new CreatePSBTResponse()
{
PSBT = update.PSBT,
ChangeAddress = hasChange ? change.ScriptPubKey.GetDestinationAddress(network.NBitcoinNetwork) : null,
Suggestions = suggestions
};
return(Json(resp, network.JsonSerializerSettings));
}
public async Task <IActionResult> CreatePSBT(
[ModelBinder(BinderType = typeof(NetworkModelBinder))]
NBXplorerNetwork network,
[ModelBinder(BinderType = typeof(DerivationStrategyModelBinder))]
DerivationStrategyBase strategy,
[FromBody]
JObject body)
{
if (body == null)
{
throw new ArgumentNullException(nameof(body));
}
CreatePSBTRequest request = ParseJObject <CreatePSBTRequest>(body, network);
if (strategy == null)
{
throw new ArgumentNullException(nameof(strategy));
}
var repo = RepositoryProvider.GetRepository(network);
var txBuilder = request.Seed is int s?network.NBitcoinNetwork.CreateTransactionBuilder(s)
: network.NBitcoinNetwork.CreateTransactionBuilder();
if (Waiters.GetWaiter(network).NetworkInfo?.GetRelayFee() is FeeRate feeRate)
{
txBuilder.StandardTransactionPolicy.MinRelayTxFee = feeRate;
}
txBuilder.OptInRBF = request.RBF;
if (request.LockTime is LockTime lockTime)
{
txBuilder.SetLockTime(lockTime);
txBuilder.OptInRBF = true;
}
var utxos = (await GetUTXOs(network.CryptoCode, strategy, null)).As <UTXOChanges>().GetUnspentCoins(request.MinConfirmations);
var availableCoinsByOutpoint = utxos.ToDictionary(o => o.Outpoint);
if (request.IncludeOnlyOutpoints != null)
{
var includeOnlyOutpoints = request.IncludeOnlyOutpoints.ToHashSet();
availableCoinsByOutpoint = availableCoinsByOutpoint.Where(c => includeOnlyOutpoints.Contains(c.Key)).ToDictionary(o => o.Key, o => o.Value);
}
if (request.ExcludeOutpoints?.Any() is true)
{
var excludedOutpoints = request.ExcludeOutpoints.ToHashSet();
availableCoinsByOutpoint = availableCoinsByOutpoint.Where(c => !excludedOutpoints.Contains(c.Key)).ToDictionary(o => o.Key, o => o.Value);
}
if (request.MinValue != null)
{
availableCoinsByOutpoint = availableCoinsByOutpoint.Where(c => request.MinValue >= c.Value.Amount).ToDictionary(o => o.Key, o => o.Value);
}
txBuilder.AddCoins(availableCoinsByOutpoint.Values);
foreach (var dest in request.Destinations)
{
if (dest.SweepAll)
{
try
{
txBuilder.SendAll(dest.Destination);
}
catch
{
throw new NBXplorerException(new NBXplorerError(400, "not-enough-funds", "You can't sweep funds, because you don't have any."));
}
}
else
{
txBuilder.Send(dest.Destination, dest.Amount);
if (dest.SubstractFees)
{
try
{
txBuilder.SubtractFees();
}
catch
{
throw new NBXplorerException(new NBXplorerError(400, "not-enough-funds", "You can't substract fee on this destination, because not enough money was sent to it"));
}
}
}
}
(Script ScriptPubKey, KeyPath KeyPath)change = (null, null);
bool hasChange = false;
if (request.ExplicitChangeAddress == null)
{
var keyInfo = await repo.GetUnused(strategy, DerivationFeature.Change, 0, false);
change = (keyInfo.ScriptPubKey, keyInfo.KeyPath);
}
else
{
// The provided explicit change might have a known keyPath, let's change for it
KeyPath keyPath = null;
var keyInfos = await repo.GetKeyInformations(new[] { request.ExplicitChangeAddress.ScriptPubKey });
if (keyInfos.TryGetValue(request.ExplicitChangeAddress.ScriptPubKey, out var kis))
{
keyPath = kis.FirstOrDefault(k => k.DerivationStrategy == strategy)?.KeyPath;
}
change = (request.ExplicitChangeAddress.ScriptPubKey, keyPath);
}
txBuilder.SetChange(change.ScriptPubKey);
PSBT psbt = null;
try
{
if (request.FeePreference?.ExplicitFeeRate is FeeRate explicitFeeRate)
{
txBuilder.SendEstimatedFees(explicitFeeRate);
}
else if (request.FeePreference?.BlockTarget is int blockTarget)
{
try
{
var rate = await GetFeeRate(blockTarget, network.CryptoCode);
txBuilder.SendEstimatedFees(rate.FeeRate);
}
catch (NBXplorerException e) when(e.Error.Code == "fee-estimation-unavailable" && request.FeePreference?.FallbackFeeRate is FeeRate fallbackFeeRate)
{
txBuilder.SendEstimatedFees(fallbackFeeRate);
}
}
else if (request.FeePreference?.ExplicitFee is Money explicitFee)
{
txBuilder.SendFees(explicitFee);
}
else
{
try
{
var rate = await GetFeeRate(1, network.CryptoCode);
txBuilder.SendEstimatedFees(rate.FeeRate);
}
catch (NBXplorerException e) when(e.Error.Code == "fee-estimation-unavailable" && request.FeePreference?.FallbackFeeRate is FeeRate fallbackFeeRate)
{
txBuilder.SendEstimatedFees(fallbackFeeRate);
}
}
psbt = txBuilder.BuildPSBT(false);
hasChange = psbt.Outputs.Any(o => o.ScriptPubKey == change.ScriptPubKey);
}
catch (NotEnoughFundsException)
{
throw new NBXplorerException(new NBXplorerError(400, "not-enough-funds", "Not enough funds for doing this transaction"));
}
// We made sure we can build the PSBT, so now we can reserve the change address if we need to
if (hasChange && request.ExplicitChangeAddress == null && request.ReserveChangeAddress)
{
var derivation = await repo.GetUnused(strategy, DerivationFeature.Change, 0, true);
// In most of the time, this is the same as previously, so no need to rebuild PSBT
if (derivation.ScriptPubKey != change.ScriptPubKey)
{
change = (derivation.ScriptPubKey, derivation.KeyPath);
txBuilder.SetChange(change.ScriptPubKey);
psbt = txBuilder.BuildPSBT(false);
}
}
var tx = psbt.GetOriginalTransaction();
if (request.Version is uint v)
{
tx.Version = v;
}
psbt = txBuilder.CreatePSBTFrom(tx, false, SigHash.All);
var update = new UpdatePSBTRequest()
{
DerivationScheme = strategy,
PSBT = psbt,
RebaseKeyPaths = request.RebaseKeyPaths
};
await UpdatePSBTCore(update, network);
var resp = new CreatePSBTResponse()
{
PSBT = update.PSBT,
ChangeAddress = hasChange ? change.ScriptPubKey.GetDestinationAddress(network.NBitcoinNetwork) : null
};
return(Json(resp, network.JsonSerializerSettings));
}