public NoneCoinbaseTransactionBuilder Spend(BcBaseTransaction transaction, UInt32 index, IEnumerable <byte> signatureScript, uint sequence = 0xffffffff)
{
if (transaction == null)
{
throw new ArgumentNullException(nameof(transaction));
}
if (index < 0)
{
// TODO : THROW
}
if (transaction.TransactionOut.Count() > index)
{
// TODO : THROW
}
if (signatureScript == null)
{
throw new ArgumentNullException(nameof(signatureScript));
}
var txId = transaction.GetTxId();
return(Spend(txId, index, signatureScript, sequence));
}
public void Check(BcBaseTransaction transaction)
{
if (transaction == null)
{
throw new ArgumentNullException(nameof(transaction));
}
var blockChain = _blockChainStore.GetBlockChain();
var memoryPool = MemoryPool.Instance();
var isCoinBaseTransaction = transaction is CoinbaseTransaction; // https://bitcoin.org/en/developer-guide#block-chain-overview
if (!isCoinBaseTransaction && (transaction.TransactionIn == null || !transaction.TransactionIn.Any()))
{
throw new ValidationException(ErrorCodes.NoTransactionIn);
}
if (!isCoinBaseTransaction)
{
long totalOutput = 0;
foreach (var txIn in transaction.TransactionIn)
{
var noneCoinBaseTxIn = txIn as TransactionInNoneCoinbase; // Check TRANSACTION EXISTS IN BLOCK CHAIN & MEMORY POOL.
var previousTxId = noneCoinBaseTxIn.Outpoint.Hash;
var previousIndex = noneCoinBaseTxIn.Outpoint.Index;
/*
* if (memoryPool.ContainsTransactions(previousTxId, previousIndex))
* {
* throw new ValidationException(ErrorCodes.AlreadySpentInMemoryPool);
* }
*/
var previousTxOut = blockChain.GetUnspentTransaction(previousTxId, previousIndex);
if (previousTxOut == null)
{
var r = memoryPool.GetUnspentTransaction(previousTxId, previousIndex) as TransactionOut;
if (r == null)
{
throw new ValidationException(ErrorCodes.ReferencedTransactionNotValid);
}
previousTxOut = new UTXO
{
Index = (int)previousIndex,
Script = r.Script,
TxId = transaction.GetTxId(),
Value = r.Value
};
}
var sigScript = Script.Deserialize(noneCoinBaseTxIn.SignatureScript); // Check SCRIPT.
var pkScript = previousTxOut.Script;
if (!_scriptInterpreter.Check(sigScript, pkScript))
{
throw new ValidationException(ErrorCodes.TransactionSignatureNotCorrect);
}
totalOutput += previousTxOut.Value;
}
var sumOutput = transaction.TransactionOut.Where(t => t is TransactionOut).Sum(t => ((TransactionOut)t).Value);
if (sumOutput > totalOutput)
{
throw new ValidationException(ErrorCodes.TransactionOutputExceedInput);
}
}
}