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Implement noadjustfee, feebumpindex and v parameters for payjoin

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This commit is contained in:
nicolas.dorier
2020-05-09 19:59:21 +09:00
parent da588380ed
commit b0f820e95a
4 changed files with 51 additions and 18 deletions
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50
BTCPayServer/Payments/PayJoin/PayJoinEndpointController.cs
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@@ -23,6 +23,7 @@ using NBXplorer.DerivationStrategy;
using System.Diagnostics.CodeAnalysis;
using BTCPayServer.Data;
using NBitcoin.DataEncoders;
using Amazon.S3.Model;
namespace BTCPayServer.Payments.PayJoin
{
@@ -115,8 +116,20 @@ namespace BTCPayServer.Payments.PayJoin
[EnableCors(CorsPolicies.All)]
[MediaTypeConstraint("text/plain")]
[RateLimitsFilter(ZoneLimits.PayJoin, Scope = RateLimitsScope.RemoteAddress)]
public async Task<IActionResult> Submit(string cryptoCode)
public async Task<IActionResult> Submit(string cryptoCode,
bool noadjustfee = false,
int feebumpindex = -1,
int v = 1)
{
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.")
});
}
var network = _btcPayNetworkProvider.GetNetwork<BTCPayNetwork>(cryptoCode);
if (network == null)
{
@@ -146,26 +159,28 @@ namespace BTCPayServer.Payments.PayJoin
Transaction originalTx = null;
FeeRate originalFeeRate = null;
bool psbtFormat = true;
if (!PSBT.TryParse(rawBody, network.NBitcoinNetwork, out var psbt))
if (PSBT.TryParse(rawBody, network.NBitcoinNetwork, out var psbt))
{
if (!psbt.IsAllFinalized())
return BadRequest(CreatePayjoinError("psbt-not-finalized", "The PSBT should be finalized"));
originalTx = 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("invalid-format", "invalid transaction or psbt"));
originalTx = tx;
psbt = PSBT.FromTransaction(tx, network.NBitcoinNetwork);
psbt = (await explorer.UpdatePSBTAsync(new UpdatePSBTRequest() {PSBT = psbt})).PSBT;
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("psbt-not-finalized", "The PSBT should be finalized"));
originalTx = psbt.ExtractTransaction();
}
async Task BroadcastNow()
{
@@ -173,8 +188,6 @@ namespace BTCPayServer.Payments.PayJoin
}
var sendersInputType = psbt.GetInputsScriptPubKeyType();
if (sendersInputType is null)
return BadRequest(CreatePayjoinError("unsupported-inputs", "Payjoin only support segwit inputs (of the same type)"));
if (psbt.CheckSanity() is var errors && errors.Count != 0)
{
return BadRequest(CreatePayjoinError("insane-psbt", $"This PSBT is insane ({errors[0]})"));
@@ -242,7 +255,7 @@ namespace BTCPayServer.Payments.PayJoin
//this should never happen, unless the store owner changed the wallet mid way through an invoice
return StatusCode(500, CreatePayjoinError("unavailable", $"This service is unavailable for now"));
}
if (sendersInputType != receiverInputsType)
if (sendersInputType is ScriptPubKeyType t && t != receiverInputsType)
{
return StatusCode(503,
CreatePayjoinError("out-of-utxos",
@@ -331,6 +344,10 @@ namespace BTCPayServer.Payments.PayJoin
var ourNewOutput = newTx.Outputs[originalPaymentOutput.Index];
HashSet<TxOut> isOurOutput = new HashSet<TxOut>();
isOurOutput.Add(ourNewOutput);
TxOut preferredFeeBumpOutput = feebumpindex >= 0
&& feebumpindex < newTx.Outputs.Count
&& !isOurOutput.Contains(newTx.Outputs[feebumpindex])
? newTx.Outputs[feebumpindex] : null;
var rand = new Random();
int senderInputCount = newTx.Inputs.Count;
foreach (var selectedUTXO in selectedUTXOs.Select(o => o.Value))
@@ -398,7 +415,7 @@ namespace BTCPayServer.Payments.PayJoin
Money expectedFee = txBuilder.EstimateFees(newTx, originalFeeRate);
Money actualFee = newTx.GetFee(txBuilder.FindSpentCoins(newTx));
Money additionalFee = expectedFee - actualFee;
if (additionalFee > Money.Zero)
if (additionalFee > Money.Zero && !noadjustfee)
{
// 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++)
@@ -418,6 +435,9 @@ namespace BTCPayServer.Payments.PayJoin
// The rest, we take from user's change
for (int i = 0; i < newTx.Outputs.Count && additionalFee > Money.Zero; i++)
{
if (preferredFeeBumpOutput is TxOut &&
preferredFeeBumpOutput != newTx.Outputs[i])
continue;
if (!isOurOutput.Contains(newTx.Outputs[i]))
{
var outputContribution = Money.Min(additionalFee, newTx.Outputs[i].Value);
@@ -492,7 +512,8 @@ namespace BTCPayServer.Payments.PayJoin
}))
.ToDictionary(pair => pair.Key, pair => pair.Value)
});
// BTCPay Server support PSBT set as hex
if (psbtFormat && HexEncoder.IsWellFormed(rawBody))
{
return Ok(newPsbt.ToHex());
@@ -501,6 +522,7 @@ namespace BTCPayServer.Payments.PayJoin
{
return Ok(newPsbt.ToBase64());
}
// BTCPay Server should returns transaction if received transaction
else
return Ok(newTx.ToHex());
}