public async Task <IBitcoinBasedTransaction> CreateSwapRefundTxAsync(
IBitcoinBasedTransaction paymentTx,
long amount,
string refundAddress,
byte[] redeemScript,
DateTimeOffset lockTime,
BitcoinBasedConfig currencyConfig)
{
var swapOutput = paymentTx.Outputs
.Cast <BitcoinBasedTxOutput>()
.FirstOrDefault(o => o.IsPayToScriptHash(redeemScript));
if (swapOutput == null)
{
throw new Exception("Can't find pay to script hash output");
}
var feeRate = await currencyConfig
.GetFeeRateAsync()
.ConfigureAwait(false);
var inputSize = new BitcoinInputToSign
{
Output = swapOutput,
Signer = new BitcoinRefundSigner()
}.SizeWithSignature();
var outputSize = new BitcoinDestination
{
AmountInSatoshi = amount,
Script = BitcoinAddress.Create(refundAddress, currencyConfig.Network).ScriptPubKey
}.Size();
var(txSize, _) = BitcoinTransactionParams.CalculateTxSize(
inputsCount: 1,
inputsSize: inputSize,
outputsCount: 1,
outputsSize: outputSize,
witnessCount: swapOutput.IsSegWit ? 1 : 0,
changeOutputSize: 0);
var feeInSatoshi = (long)(txSize * feeRate);
if (amount - feeInSatoshi < 0)
{
throw new Exception($"Insufficient funds for fee. Available {amount}, required {feeInSatoshi}");
}
return(currencyConfig.CreateP2PkhTx(
unspentOutputs: new ITxOutput[] { swapOutput },
destinationAddress: refundAddress,
changeAddress: refundAddress,
amount: amount - feeInSatoshi,
fee: feeInSatoshi,
lockTime: lockTime,
knownRedeems: new Script(redeemScript)));
}
public static IBitcoinBasedTransaction CreatePaymentTx(
BitcoinBasedConfig currency,
IEnumerable <ITxOutput> outputs,
PubKey from,
PubKey to,
int amount,
int fee,
DateTimeOffset lockTime,
params Script[] knownRedeems)
{
return(currency.CreateP2PkhTx(
unspentOutputs: outputs,
destinationAddress: to.GetAddress(ScriptPubKeyType.Legacy, currency.Network).ToString(),
changeAddress: from.GetAddress(ScriptPubKeyType.Legacy, currency.Network).ToString(),
amount: amount,
fee: fee,
lockTime: lockTime,
knownRedeems: knownRedeems));
}