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check output sum of proposed payjoin

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This commit is contained in:
Kukks
2020-03-27 09:53:08 +01:00
parent 065be9be64
commit 64717328f6
2 changed files with 15 additions and 3 deletions
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14
BTCPayServer/Controllers/WalletsController.PSBT.cs
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@@ -159,7 +159,7 @@ namespace BTCPayServer.Controllers
private async Task<PSBT> TryGetBPProposedTX(string bpu, PSBT psbt, DerivationSchemeSettings derivationSchemeSettings, BTCPayNetwork btcPayNetwork)
private async Task<PSBT> TryGetPayjoinProposedTX(string bpu, PSBT psbt, DerivationSchemeSettings derivationSchemeSettings, BTCPayNetwork btcPayNetwork)
{
if (!string.IsNullOrEmpty(bpu) && Uri.TryCreate(bpu, UriKind.Absolute, out var endpoint))
{
@@ -192,6 +192,7 @@ namespace BTCPayServer.Controllers
if (!input.TryFinalizeInput(out _))
{
//a new input was provided but was invalid.
valid = false;
break;
}
@@ -204,6 +205,17 @@ namespace BTCPayServer.Controllers
return null;
}
//check if output sum to self is the same.
var signingAccountKeySettings = derivationSchemeSettings.GetSigningAccountKeySettings();
var newOutputSumToSelfSum = newPSBT.Outputs.CoinsFor(derivationSchemeSettings.AccountDerivation, signingAccountKeySettings.AccountKey,
signingAccountKeySettings.GetRootedKeyPath()).Sum(output => output.Value);
var originalOutputSumToSelf = psbt.Outputs.Sum(output => output.Value);
if (originalOutputSumToSelf < newOutputSumToSelfSum)
{
return null;
}
newPSBT = await UpdatePSBT(derivationSchemeSettings, newPSBT, btcPayNetwork);
TempData.SetStatusMessageModel(new StatusMessageModel()
{