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//
// AppStoreReceipt.swift
// MullvadVPN
//
// Created by pronebird on 11/03/2020.
// Copyright © 2020 Mullvad VPN AB. All rights reserved.
//
import Foundation
import StoreKit
enum AppStoreReceipt {
enum Error: ChainedError {
/// AppStore receipt file does not exist or file URL is not available
case doesNotExist
/// IO error
case io(Swift.Error)
/// Failure to refresh the receipt from AppStore
case refresh(Swift.Error)
var errorDescription: String? {
switch self {
case .doesNotExist:
return "AppStore receipt file does not exist on disk"
case .io:
return "Read error"
case .refresh:
return "Receipt refresh error"
}
}
}
/// An operation queue used to run receipt refresh requests
private static let operationQueue: OperationQueue = {
let queue = OperationQueue()
queue.name = "AppStoreReceiptQueue"
queue.maxConcurrentOperationCount = 1
return queue
}()
/// Read AppStore receipt from disk or refresh it from AppStore if it's missing.
/// This call may trigger a sign in with AppStore prompt to appear.
static func fetch(forceRefresh: Bool = false, receiptProperties: [String: Any]? = nil) -> Result<Data, Error>.Promise {
if forceRefresh {
return refreshReceipt(receiptProperties: receiptProperties)
} else {
return self.readFromDisk()
.asPromise()
.flatMapErrorThen { error in
if case .doesNotExist = error {
return refreshReceipt(receiptProperties: receiptProperties)
} else {
return .failure(error)
}
}
}
}
/// Read AppStore receipt from disk
private static func readFromDisk() -> Result<Data, Error> {
guard let appStoreReceiptURL = Bundle.main.appStoreReceiptURL else {
return .failure(.doesNotExist)
}
return Result { try Data(contentsOf: appStoreReceiptURL) }
.mapError { (error) -> Error in
if let cocoaError = error as? CocoaError, cocoaError.code == .fileReadNoSuchFile || cocoaError.code == .fileNoSuchFile {
return .doesNotExist
} else {
return .io(error)
}
}
}
/// Refresh receipt from AppStore
private static func refreshReceipt(receiptProperties: [String: Any]?) -> Result<Data, Error>.Promise {
return Result<(), Swift.Error>.Promise { resolver in
let operation = ReceiptRefreshOperation(receiptProperties: receiptProperties) { result in
resolver.resolve(value: result)
}
self.operationQueue.addOperation(operation)
}
.mapError { error in
return .refresh(error)
}
.flatMap {
return Self.readFromDisk()
}
}
}
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