public async Task <TransactionValidationResult> ValidateDataTransaction(DataTransaction transaction)
{
var userCode = 0L;
var result = TransactionResultTypes.Unknown;
var message = string.Empty;
TransactionValidation nodeValidation = null;
var type = transaction.TransactionType;
var chainInfo = _coreChain.GetChainInfo(ChainId);
var accountId = transaction.AccountId;
var service = _node.ChainManager.GetService(ChainId);
if (chainInfo == null)
{
result = TransactionResultTypes.ChainNotFound;
goto end;
}
if (service == null)
{
result = TransactionResultTypes.ChainServiceUnavailable;
goto end;
}
if (!_chainKeyValid)
{
var chainKey = chainInfo.GetValidChainKey(ChainIndex, ChainKeyIndex, Time.Timestamp);
if (chainKey == null || chainKey.PublicKey != ChainKey.PublicKey)
{
result = TransactionResultTypes.ChainNodeInvalid;
goto end;
}
_chainKeyValid = true;
}
if (transaction == null)
{
result = TransactionResultTypes.InvalidTransaction;
goto end;
}
if (!transaction.IsDataTransactionValid)
{
result = TransactionResultTypes.InvalidContent;
goto end;
}
if (BlockStorage.History.ContainsTransactionIdentifier(transaction))
{
result = TransactionResultTypes.AlreadyProcessed;
goto end;
}
var coreAccount = _coreChain.GetCoreAccount(accountId);
if (coreAccount == null)
{
result = TransactionResultTypes.InvalidCoreAccount;
goto end;
}
var serviceAccount = _serviceChain.GetServiceAccount(accountId);
if (transaction.SignKeyIndex == Protocol.CoreAccountSignKeyIndex)
{
if (!transaction.IsSignatureValid(coreAccount.AccountKey, null))
{
result = TransactionResultTypes.InvalidSignature;
goto end;
}
}
else
{
if (serviceAccount == null)
{
result = TransactionResultTypes.InvalidServiceAccount;
goto end;
}
var accountKey = serviceAccount.GetValidAccountKey(transaction.SignKeyIndex, transaction.Timestamp);
if (accountKey == null)
{
result = TransactionResultTypes.InvalidServiceAccountKey;
goto end;
}
if (accountKey.IsExpired())
{
result = TransactionResultTypes.Expired;
goto end;
}
if (!transaction.IsSignatureValid(coreAccount.AccountKey, accountKey))
{
result = TransactionResultTypes.InvalidSignature;
goto end;
}
}
{
var(featResult, featCode) = ValidateTransactionFeatures((ushort)DataTransactionTypes.FeatureRequest, transaction);
if (featResult != TransactionResultTypes.Ok)
{
result = featResult;
userCode = featCode;
goto end;
}
}
if (type == DataTransactionTypes.Attachement)
{
if (!Attachements.AreAttachementsUploaded(transaction as AttachementDataTransaction))
{
result = TransactionResultTypes.AttachementsNotUploaded;
goto end;
}
}
var purchaseRequired = transaction.GetFeature <RequiredPurchase>(RequiredPurchase.FeatureId);
if (purchaseRequired != null && purchaseRequired.RequiredPurchaseType != PurchaseTypes.None)
{
if (!serviceAccount.HasRequiredTransactionPurchase(transaction, purchaseRequired))
{
result = TransactionResultTypes.PurchaseRequired;
goto end;
}
}
var validation = await service.IsDataTransactionValid(transaction);
userCode = validation.UserCode;
message = validation.Message;
if (!validation.IsOK)
{
if (validation.Result == ServiceResultTypes.PurchaseRequired)
{
result = TransactionResultTypes.PurchaseRequired;
}
else
{
result = TransactionResultTypes.ChainServiceErrorResponse;
}
goto end;
}
result = TransactionResultTypes.Ok;
nodeValidation = new TransactionValidation(transaction, ChainKeyIndex, ChainKey);
end:
return(new TransactionValidationResult(result, userCode, message, nodeValidation));
}
