public static async Task <string> SignTransaction(KeyPair keyPair, string xdrData)
{
try {
var bytes = Convert.FromBase64String(xdrData);
var transEnv = TransactionEnvelope.Decode(new XdrDataInputStream(bytes));
var sourceKP = KeyPair.FromXdrPublicKey(transEnv.Tx.SourceAccount.InnerValue);
var server = new Server(horizon_url);
var accResponse = await server.Accounts.Account(sourceKP);
var source = new Account(sourceKP, accResponse.SequenceNumber);
var builder = new stellar_dotnetcore_sdk.Transaction.Builder(source);
foreach (var o in transEnv.Tx.Operations)
{
var operation = PaymentOperation.FromXdr(o);
builder.AddOperation(operation);
}
if (transEnv.Tx.Memo != null && transEnv.Tx.Memo.Text != null)
{
var m = stellar_dotnetcore_sdk.Memo.Text(transEnv.Tx.Memo.Text);
builder.AddMemo(m);
}
var trans = builder.Build();
trans.Sign(keyPair);
var signedXdrData = trans.ToEnvelopeXdrBase64();
return(signedXdrData);
} catch (Exception ex) {
System.Diagnostics.Debug.WriteLine(ex);
return(null);
}
}