public bool Validate(AdyenNotification.NotificationRequestItem body)
{
object hmacSignature = null;
if (!body.AdditionalData?.TryGetValue("hmacSignature", out hmacSignature) == true)
{
return(false);
}
var signature = (string)hmacSignature;
var payload = ConcatenatePayload(body);
var payloadBytes = Encoding.UTF8.GetBytes(payload);
var hash = HmacHash(_currentKeyBytes, payloadBytes);
if (hash == signature)
{
// new key working, clear cache
_oldKeyCache = null;
return(true);
}
if (_oldKeyCache == null)
{
return(false);
}
return(HmacHash(ConvertFromHex(_oldKeyCache), payloadBytes) == signature);
}
private static string ConcatenatePayload(AdyenNotification.NotificationRequestItem body)
{
return
($"{body.PspReference}:{body.OriginalReference}:{body.MerchantAccountCode}:{body.MerchantReference}:{body.Amount.Value}:{body.Amount.Currency}:{body.EventCode}:{body.Success.ToString().ToLower()}");
}