// common validations for Send and Receive blocks
protected APIResultCodes VerifyTransactionBlock(TransactionBlock block)
{
// Validate the account id
if (!Signatures.ValidateAccountId(block.AccountID))
{
return(APIResultCodes.InvalidAccountId);
}
if (!string.IsNullOrEmpty(block.PreviousHash)) // not for new account
{
// verify the entire account chain to make sure all account's blocks are valid
TransactionBlock prevBlock, thisBlock = block;
//while (thisBlock.BlockType != BlockTypes.OpenWithReceiveTransfer && thisBlock.BlockType != BlockTypes.OpenWithReceiveFee)
while (!(thisBlock is IOpeningBlock))
{
prevBlock = _accountCollection.FindBlockByHash(thisBlock.PreviousHash);
if (!thisBlock.IsBlockValid(prevBlock))
{
return(APIResultCodes.AccountChainBlockValidationFailed);
}
if (!Signatures.VerifyAccountSignature(thisBlock.Hash, thisBlock.AccountID, thisBlock.Signature))
{
return(APIResultCodes.AccountChainSignatureValidationFailed);
}
thisBlock = prevBlock;
}
// verify the spending
TransactionBlock previousTransaction = _accountCollection.FindBlockByHash(block.PreviousHash);
foreach (var prevbalance in previousTransaction.Balances)
{
// make sure all balances from the previous block are present in a new block even if they are unchanged
if (!block.Balances.ContainsKey(prevbalance.Key))
{
return(APIResultCodes.AccountChainBalanceValidationFailed);
}
}
// Verify fee
if (block.BlockType == BlockTypes.SendTransfer)
{
if ((block as SendTransferBlock).Fee != _serviceAccount.GetLastServiceBlock().TransferFee)
{
return(APIResultCodes.InvalidFeeAmount);
}
}
if (block.BlockType == BlockTypes.TokenGenesis)
{
if ((block as TokenGenesisBlock).Fee != _serviceAccount.GetLastServiceBlock().TokenGenerationFee)
{
return(APIResultCodes.InvalidFeeAmount);
}
}
}
var res = ValidateFee(block);
if (res != APIResultCodes.Success)
{
return(res);
}
return(APIResultCodes.Success);
}