private void ValidateTransaction(Transaction transaction)
{
if (!CryptoUtil.IsAddressValid(transaction.FromAddress))
{
throw new AddressNotValidException($"{transaction.FromAddress} is not valid address");
}
if (!CryptoUtil.IsAddressValid(transaction.ToAddress))
{
throw new AddressNotValidException($"{transaction.ToAddress} is not valid address");
}
if (transaction == null)
{
throw new ArgumentException("'transaction' object cannot be null");
}
//check whetehr we know that transaction
if (PendingTransactions.FirstOrDefault(t => t.TransactionHash == transaction.TransactionHash) != null)
{
return;
}
//check whether transaction is already mined
if (BlockChain.Any(b => b.Value.Transactions.Any(t => t.TransactionHash == transaction.TransactionHash)))
{
return;
}
if (string.IsNullOrWhiteSpace(transaction.SenderPublicKey))
{
throw new TransactionNotValidException("Sender signature cannot be empty");
}
bool isHashValid = TransactionValidator.IsValidateHash(transaction);
if (!isHashValid)
{
throw new TransactionNotValidException("Transaction not Valid! Tranascion is chnaged by middle man");
}
bool isVerified = TransactionValidator.IsValid(transaction);
if (!isVerified)
{
throw new TransactionNotValidException("Transaction not Valid! Signutre is not valid");
}
string address = TransactionValidator.GetAddress(transaction.SenderPublicKey);
if (address != transaction.FromAddress)
{
throw new TransactionNotValidException("Provided address is not valid.");
}
}