Swift: StoreKit - processTransactionRestore causes crash - ios

Question

When restoring I get a crash fatal error: unexpectedly found nil while unwrapping an Optional value
Whenever I click the restore button to check if I had bought a package before, to test it out in sandbox. The function processTransactionRestore gets called to verify the receipt but the code is being executed multiple times around 20 every time. I have a print saying "Processing Transaction Restore" and in the logs you see the print 22 times and since I have a uialert to tell you that it failed. I get the uialert 22 times non stop.
Any help?
Subscription.swift
// When restore product
func processTransactionRestore(transaction: SKPaymentTransaction) {
if transaction.payment.productIdentifier == "com.example.year" {
print("Bought Year Package: Premium")
}
print("Processing Transaction Restore")
// Validate Receipt
Validation.validateReceipt( completed: {
if Validation.isSubscribed() {
DispatchQueue.main.async{
// Go To Protected Page: MainController
let mainPage = self.storyboard?.instantiateViewController(withIdentifier: "MainController") as! MainController
let mainPageNav = UINavigationController(rootViewController: mainPage)
let appDelegate = UIApplication.shared.delegate
appDelegate?.window??.rootViewController = mainPageNav
}
} else {
print("Not Validated! Nothing to restore.. Trying Again..")
// Alert
let alert = UIAlertController(title: "Nothing to Restore", message: "Unable to find any products to restore.", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.default, handler: nil))
alert.addAction(UIAlertAction(title: "Try Again", style: UIAlertActionStyle.default, handler: { _ in
// Repeating Validate Receipt
Validation.validateReceipt( completed: {
if Validation.isSubscribed() {
DispatchQueue.main.async{
// Go To Protected Page: MainController
let mainPage = self.storyboard?.instantiateViewController(withIdentifier: "MainController") as! MainController
let mainPageNav = UINavigationController(rootViewController: mainPage)
let appDelegate = UIApplication.shared.delegate
appDelegate?.window??.rootViewController = mainPageNav
}
} else {
print("Not Validated! Nothing to process.. Trying Again..")
// Alert
let alert = UIAlertController(title: "Nothing to Process", message: "Unable to process any products.", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.default, handler: nil))
alert.addAction(UIAlertAction(title: "Try Again", style: UIAlertActionStyle.default, handler: { _ in
print("Try Again button")
}))
self.present(alert, animated: true, completion: nil)
}
})
}))
self.present(alert, animated: true, completion: nil)
}
})
}
func paymentQueueRestoreCompletedTransactionsFinished(_ queue: SKPaymentQueue) {
print("Transactions Restored")
for transaction in queue.transactions {
processTransactionRestore(transaction: transaction)
}
}
Restore button
#IBAction func restoreButton(_ sender: Any) {
print("Restoring Purchase")
SKPaymentQueue.default().restoreCompletedTransactions()
}
Logs
Restoring Purchase
Transactions Restored
Bought Year Package: Premium
Processing Transaction Restore
Validating Receipt...
Processing Transaction Restore
Validating Receipt...
Processing Transaction Restore
Validating Receipt...
Bought Year Package: Premium
Processing Transaction Restore
Validating Receipt...
Processing Transaction Restore
Validating Receipt...
Bought Year Package: Premium
Processing Transaction Restore
Validating Receipt...
Bought Year Package: Premium
Processing Transaction Restore
Validating Receipt...
Processing Transaction Restore
Validating Receipt...
Bought Year Package: Premium
Not Validated! Nothing to restore.. Trying Again..
fatal error: unexpectedly found nil while unwrapping an Optional value
Validation.swift
public class Validation: UIViewController {
class func isSubscribed() -> Bool {
// Setting subscribed to be whatever its saved as
if let mainSubscribed: Bool = customKeychainWrapperInstance.bool(forKey: "isSubscribed") {
print("Found Key! for isSubscribed")
subscribed = mainSubscribed
} else {
print("No Key Found: Validating Receipt!")
subscribed = false
}
return subscribed
}
class func validateReceipt(completed:(() -> Void)?) {
var date_today_ms: Int64 = 0
var date_expires_ms: Int64 = 0
var statusCode: Int = 1
let receiptUrl = Bundle.main.appStoreReceiptURL
do {
print("Validating Receipt...")
// Run Activity Indicator
//
// Getting Data
let receipt: Data = try Data(contentsOf:receiptUrl!)
let receiptdata: NSString = receipt.base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0)) as NSString
let request = NSMutableURLRequest(url: NSURL(string: "https://example.com/verify.php")! as URL)
let session = URLSession.shared
request.httpMethod = "POST"
request.httpBody = receiptdata.data(using: String.Encoding.ascii.rawValue)
let task = session.dataTask(with: request as URLRequest, completionHandler: {(data, response, error) in
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary
if(error != nil) {
print(error!.localizedDescription)
let jsonStr = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
print("Error could not parse JSON: '\(String(describing: jsonStr))'")
// isSubscribed is False
subscribed = false
saveSubscriptionKey()
} else {
if let parseJSON = json {
if (parseJSON["status"] as? Int == 0) {
print("Sucessfully returned purchased receipt data!")
statusCode = 0
// Checking "latest_receipt_info"
if let receiptInfo: NSArray = parseJSON["latest_receipt_info"] as? NSArray {
let lastReceipt = receiptInfo.lastObject as! NSDictionary
// Get last receipt
print("\nLast Receipt Information: \n", lastReceipt)
// Getting Expired Time in MS
if let expiresString = lastReceipt["expires_date_ms"] as? String, let expiresMS = Int64(expiresString) {
date_expires_ms = expiresMS / 1000
}
// Remember doing anything in the JSON causes failure
}
} else if (parseJSON["status"] as? Int == 21002) {
print("Status Code: 21002 - The data in the receipt-data property was malformed or missing.")
// try it again maybe 2 times then cancel it
// isSubscribed is False
subscribed = false
saveSubscriptionKey()
} else { // add more status codes statements
print("Status Code: Something went wrong!")
// cancel it
// isSubscribed is False
subscribed = false
saveSubscriptionKey()
}
} else {
let jsonStr = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
print("Receipt Error: \(String(describing: jsonStr))")
// isSubscribed is False
subscribed = false
saveSubscriptionKey()
}
}
} catch {
print("Error: (Receipt to JSON)")
// isSubscribed is False
subscribed = false
saveSubscriptionKey()
}
// ........ Outside the `do try JSON {` ....................
// is Validated [0]
if statusCode == 0 {
// [1] Checking 'Expired Date' //
print("date_expires: \(date_expires_ms)") // Date Expired
// Getting Todays Time in MS
date_today_ms = Int64(Date().timeIntervalSince1970) //* 1000
print("date_today: \(date_today_ms)")
if date_expires_ms < date_today_ms {
print("The product is EXPIRED!")
// isSubscribed is False
subscribed = false
saveSubscriptionKey()
} else {
print("The product is ACTIVE!")
// isSubscribed = True
subscribed = true
saveSubscriptionKey()
}
// [2] Checking Blank ...
}
if let completedBlock = completed {
completedBlock();
}
})
task.resume()
} catch {
print("Error: (Receipt URL)")
// isSubscribed is False
subscribed = false
saveSubscriptionKey()
if let completedBlock = completed {
completedBlock();
}
}
}
}