protected APIResultCodes VerifyBlock(TransactionBlock block, TransactionBlock previousBlock)
{
if (NodeGlobalParameters.Network_Id != block.NetworkId)
{
return(APIResultCodes.InvalidNetworkId);
}
if (!block.IsBlockValid(previousBlock))
{
return(APIResultCodes.BlockValidationFailed);
}
//if (!Signatures.VerifySignature(block.Hash, block.AccountID, block.Signature))
// return APIResultCodes.BlockSignatureValidationFailed;
if (!block.VerifySignature(block.AccountID))
{
return(APIResultCodes.BlockSignatureValidationFailed);
}
// check if this Index already exists (double-spending, kind of)
if (_accountCollection.FindBlockByIndex(block.AccountID, block.Index) != null)
{
return(APIResultCodes.BlockWithThisIndexAlreadyExists);
}
// This is the double-spending check for send block!
if (!string.IsNullOrEmpty(block.PreviousHash) && _accountCollection.FindBlockByPreviousBlockHash(block.PreviousHash) != null)
{
return(APIResultCodes.BlockWithThisPreviousHashAlreadyExists);
}
if (block.Index <= 0)
{
return(APIResultCodes.InvalidIndexSequence);
}
if (block.Index > 1 && previousBlock == null)
{
return(APIResultCodes.CouldNotFindLatestBlock);
}
if (block.Index == 1 && previousBlock != null)
{
return(APIResultCodes.InvalidIndexSequence);
}
if (previousBlock != null && block.Index != previousBlock.Index + 1)
{
return(APIResultCodes.InvalidIndexSequence);
}
if (!ValidateRenewalDate(block, previousBlock))
{
return(APIResultCodes.TokenExpired);
}
return(APIResultCodes.Success);
}
// common validations for Send and Receive blocks
protected async Task <APIResultCodes> VerifyTransactionBlockAsync(DagSystem sys, 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))
if (!(thisBlock is IOpeningBlock)) //save time
{
prevBlock = await sys.Storage.FindBlockByHashAsync(thisBlock.PreviousHash) as TransactionBlock;
if (!thisBlock.IsBlockValid(prevBlock))
{
return(APIResultCodes.AccountChainBlockValidationFailed);
}
//if(block.ContainsTag(Block.MANAGEDTAG))
//{
// var svcBlock = await sys.Storage.FindBlockByHashAsync(block.ServiceHash) as ServiceBlock;
// var result = Signatures.VerifyAccountSignature(thisBlock.Hash, svcBlock.Leader, thisBlock.Signature);
// if (!result)
// return APIResultCodes.AccountChainSignatureValidationFailed;
//}
//else
//{
// var result = Signatures.VerifyAccountSignature(thisBlock.Hash, thisBlock.AccountID, thisBlock.Signature);
// if (!result)
// return APIResultCodes.AccountChainSignatureValidationFailed;
//}
thisBlock = prevBlock;
}
// verify the spending
TransactionBlock previousTransaction = await sys.Storage.FindBlockByHashAsync(block.PreviousHash) as TransactionBlock;
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);
}
}
}
return(APIResultCodes.Success);
}
// 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);
}