public async Task <PurchaseAttemptResult> PurchaseAttempt(string userId, string platform, string productId, string purchaseToken)
{
var subscription = await Repository.GetByPurchaseToken(purchaseToken);
if (subscription is not null)
{
throw new Exception($"An existing subscription found for token '{purchaseToken}'.");
}
var storeConnector = StoreConnectorResolver.Resolve(platform);
var subscriptionInfo = await storeConnector.GetSubscriptionInfo(new SubscriptionInfoArgs
{
UserId = userId,
ProductId = productId,
PurchaseToken = purchaseToken
});
if (subscriptionInfo.Status == SubscriptionQueryStatus.NotFound)
{
return(PurchaseAttemptResult.Failed);
}
if (await IsSubscriptionMismatched(userId, subscriptionInfo))
{
return(PurchaseAttemptResult.UserMismatched);
}
subscription = await Repository.GetByTransactionId(subscriptionInfo.TransactionId);
if (subscription is not null)
{
throw new Exception($"An existing subscription found for transaction '{subscriptionInfo.TransactionId}'.");
}
await Repository.AddSubscription(new Subscription
{
Id = Guid.NewGuid().ToString(),
UserId = userId,
Platform = platform,
ProductId = productId,
TransactionId = subscriptionInfo.TransactionId,
TransactionDate = subscriptionInfo.SubscriptionDate,
PurchaseToken = purchaseToken,
LastUpdate = LocalTime.UtcNow,
SubscriptionDate = subscriptionInfo.SubscriptionDate,
ExpirationDate = subscriptionInfo.ExpirationDate,
CancellationDate = subscriptionInfo.CancellationDate,
AutoRenews = subscriptionInfo.AutoRenews
});
return(PurchaseAttemptResult.Succeeded);
}
public async Task <VerifyPurchaseResult> VerifyPurchase(string userId, string platform, string productId, string transactionId, string receiptData)
{
var storeConnector = StoreConnectorResolver.Resolve(platform);
var status = await storeConnector.VerifyPurchase(new VerifyPurchaseArgs
{
UserId = userId,
ReceiptData = receiptData
});
if (status != PurchaseVerificationStatus.Verified)
{
return(VerifyPurchaseResult.From(status));
}
var subscription = await Repository.GetByTransactionId(transactionId);
if (subscription is not null)
{
if (subscription.UserId != userId)
{
throw new Exception("Provided purchase token is associated with another user!");
}
if (subscription.Platform != platform)
{
throw new Exception("Provided purchase token is associated with another platform!");
}
if (subscription.ProductId != productId)
{
throw new Exception("Provided purchase token is associated with another product!");
}
}
else
{
await Repository.AddSubscription(new Subscription
{
Id = Guid.NewGuid().ToString(),
UserId = userId,
Platform = platform,
ProductId = productId,
TransactionId = transactionId,
ReceiptData = receiptData,
LastUpdate = LocalTime.UtcNow
});
}
return(VerifyPurchaseResult.Succeeded());
}
