Obtaining the Appstore receipt for iOS Apps

AppstoreReceiptObtain.swift

class AppStoreReceiptObtainer: NSObject, SKRequestDelegate {

    let receiptUrl = NSBundle.mainBundle().appStoreReceiptURL

    func obtainReceipt() {
        var fileExists = NSFileManager.defaultManager().fileExistsAtPath(receiptUrl.path!)

        if fileExists {
            println("Appstore Receipt already exists")
            return;
        }

        requestReceipt()
    }

    func requestReceipt() {
        println("request a receipt")
        let request = SKReceiptRefreshRequest(receiptProperties: nil)
        request.delegate = self
        request.start()
    }

    //MARK: SKRequestDelegate methods

    func requestDidFinish(request: SKRequest!) {
        println("request did finish")
        var fileExists = NSFileManager.defaultManager().fileExistsAtPath(receiptUrl.path!)

        if fileExists {
            println("Appstore Receipt now exists")
            return
        }

        println("something went wrong while obtaining the receipt, maybe the user did not successfully enter it's credentials")
    }

    func request(request: SKRequest!, didFailWithError error: NSError!) {
        println("request did fail with error: \(error.domain)")
    }
}