private bool IsSignatureValid(FomoPayResponse fomoPayResponse)
{
var param = new SortedDictionary <string, string>
{
{ "transaction", fomoPayResponse.transaction },
{ "result", fomoPayResponse.result },
{ "upstream", fomoPayResponse.upstream },
{ "nonce", fomoPayResponse.nonce },
{ "payment_id", fomoPayResponse.payment_id }
};
var strArray = new StringBuilder();
foreach (var(key, value) in param)
{
strArray.Append(key + "=" + value + "&");
}
var nLen = strArray.Length;
strArray.Remove(nLen - 1, 1);
var computeSha256Hash = ComputeSha256Hash(strArray.ToString());
_logger.LogInformation(
$"computedSignature:{computeSha256Hash},originalSignature:{fomoPayResponse.signature}");
return(computeSha256Hash == fomoPayResponse.signature);
}
public void ProcessPaymentCallback([FromForm] FomoPayResponse fomoPayResponse)
{
_logger.LogInformation("processPaymentCallback Request:" + JsonConvert.SerializeObject(fomoPayResponse));
if (!IsSignatureValid(fomoPayResponse))
{
return;
}
SaveFomoPayResponse(fomoPayResponse).GetAwaiter().GetResult();
}
private async Task SaveFomoPayResponse(FomoPayResponse fomoPayResponse)
{
var topUpHistory = await _eWalletService.FindByTopUpTransactionIdAsync(fomoPayResponse.transaction);
var initTransaction = topUpHistory.First(x => x.Status == Status.Init);
if (initTransaction != null)
{
TopUpResource topUpResource = new TopUpResource
{
TransactionId = fomoPayResponse.transaction,
ActionDate = DateTime.Now,
Status = fomoPayResponse.result == "0" ? Status.Success : Status.Fail,
PaymentReferenceNo = fomoPayResponse.payment_id + '|' + fomoPayResponse.upstream + '|' +
fomoPayResponse.nonce + '|' +
fomoPayResponse.signature,
Amount = initTransaction.Amount,
PaymentMerchant = initTransaction.PaymentMerchant
};
await _eWalletService.SaveTopUpAsync(topUpResource, initTransaction.UserId);
}
}