/// <summary>
/// Creates an instance of the <see cref="AppleReceiptVerificationResult"/>
/// with Detailed Apple Verification Response (<param name="verificationResponse"></param>)
/// and verbal result description (<param name="errorMessage"></param>)
/// </summary>
public AppleReceiptVerificationResult(
string errorMessage,
IAPVerificationResponse verificationResponse
)
{
Message = errorMessage;
AppleVerificationResponse = verificationResponse;
if (verificationResponse != null)
{
Status = verificationResponse.StatusCode;
// Backward compatibility.
Receipt = verificationResponse.Receipt;
}
else
{
Status = IAPVerificationResponseStatus.InternalVerificationFailed;
}
}
private async Task <AppleReceiptVerificationResult?> VerifyReceiptAsync(string receiptData, IRestService restService)
{
// 1. Validate incoming arguments
if (string.IsNullOrEmpty(receiptData))
{
_logger.LogInformation("receiptData cannot be empty");
return(new AppleReceiptVerificationResult(
"receiptData cannot be empty",
IAPVerificationResponseStatus.WrongArgument
));
}
// 2. Pre-validate Receipt (Optional)
try
{
var data = Convert.FromBase64String(receiptData);
var receipt = _receiptParserService.GetAppleReceiptFromBytes(data);
// a. Validate bundle ID
if (receipt != null && !_settings.Value.AllowedBundleIds.Contains(receipt.BundleId))
{
_logger.LogInformation("Receipt has wrong bundle ID {bundle_id}", receipt.BundleId);
return(new AppleReceiptVerificationResult(
$"Receipt has wrong bundle ID {receipt.BundleId}",
IAPVerificationResponseStatus.WrongArgument
));
}
if (_customValidation != null)
{
// if custom Validator implemented
var validationResult = _customValidation.ValidateReceipt(receipt);
if (validationResult == null || validationResult.Status != IAPVerificationResponseStatus.Ok)
{
// and custom validation doesn't passed - failed
return(validationResult);
}
}
}
catch (Exception e)
{
_logger.LogError(e, "Something went wrong in receipt prevalidation. Seems to be invalid receipt data. Skip this step.");
}
// 3. Validate Receipt in Apple (verification in IAP)
try
{
_logger.LogDebug("Start receipt verification in IAP...");
var request = new IAPVerificationRequest(receiptData, _settings.Value.VerifyReceiptSharedSecret);
IAPVerificationResponse iapVerificationResult = await restService.ValidateAppleReceiptAsync(request).ConfigureAwait(false);
if (iapVerificationResult == null)
{
return(new AppleReceiptVerificationResult(
"IAP receipt verification failed. Apple returned empty receipt.",
IAPVerificationResponseStatus.InternalVerificationFailed
));
}
var iapStatus = iapVerificationResult.StatusCode;
// 1.If status <> 0 - failed
if (iapStatus != IAPVerificationResponseStatus.Ok)
{
return(new AppleReceiptVerificationResult(
"IAP receipt verification failed",
iapVerificationResult
));
}
_logger.LogInformation("IAPReceipt Verification passed.");
return(new AppleReceiptVerificationResult(
"Everything is OK.",
iapVerificationResult
));
}
catch (Exception e)
{
_logger.LogError(e, "Something went wrong in IAP receipt verification");
return(new AppleReceiptVerificationResult(
"Something went wrong in IAP receipt verification",
IAPVerificationResponseStatus.InternalVerificationBroken
));
}
}
