mas/mas-cli/AppStore/Downloader.swift

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//
// Downloader.swift
// mas-cli
//
// Created by Andrew Naylor on 21/08/2015.
// Copyright (c) 2015 Andrew Naylor. All rights reserved.
//
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func download(_ adamId: UInt64) -> MASError? {
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guard let account = ISStoreAccount.primaryAccount else {
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return .notSignedIn
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}
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let group = DispatchGroup()
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let purchase = SSPurchase(adamId: adamId, account: account)
var purchaseError: MASError?
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var observerIdentifier: Any? = nil
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group.enter()
purchase.perform { purchase, _, error, response in
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if let error = error {
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purchaseError = .purchaseFailed(error: error as NSError?)
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group.leave()
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return
}
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if let downloads = response?.downloads, downloads.count > 0, let purchase = purchase {
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let observer = PurchaseDownloadObserver(purchase: purchase)
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observer.errorHandler = { error in
purchaseError = error
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group.leave()
}
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observer.completionHandler = {
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group.leave()
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}
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let downloadQueue = CKDownloadQueue.shared()
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observerIdentifier = downloadQueue?.add(observer)
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}
else {
print("No downloads")
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purchaseError = .noDownloads
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group.leave()
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}
}
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let _ = group.wait(timeout: .distantFuture)
if let observerIdentifier = observerIdentifier {
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CKDownloadQueue.shared().removeObserver(observerIdentifier)
}
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return purchaseError
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}