// swiftlint:disable all // // PKCS7_AppleReceipt.swift // // Copyright © 2018 Filippo Maguolo. // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in all // copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE // SOFTWARE. import Foundation /* This extension allow to parse the content of an Apple receipt from the AppStore. Reference documentation https://developer.apple.com/library/archive/releasenotes/General/ValidateAppStoreReceipt/Chapters/ReceiptFields.html */ extension PKCS7 { public struct ReceiptInfo { /// CFBundleIdentifier in Info.plist public fileprivate(set) var bundleIdentifier: String? /// CFBundleIdentifier in Info.plist as bytes, used, with other data, to compute the SHA-1 hash during validation. public fileprivate(set) var bundleIdentifierData: Data? /// CFBundleVersion (in iOS) or CFBundleShortVersionString (in macOS) in Info.plist public fileprivate(set) var bundleVersion: String? /// CFBundleVersion (in iOS) or CFBundleShortVersionString (in macOS) in Info.plist public fileprivate(set) var originalApplicationVersion: String? /// Opaque value used, with other data, to compute the SHA-1 hash during validation. public fileprivate(set) var opaqueValue: Data? /// SHA-1 hash, used to validate the receipt. public fileprivate(set) var sha1: Data? public fileprivate(set) var receiptCreationDate: Date? public fileprivate(set) var receiptCreationDateString: String? public fileprivate(set) var receiptExpirationDate: Date? public fileprivate(set) var receiptExpirationDateString: String? public fileprivate(set) var inAppPurchases: [InAppPurchaseInfo]? } public struct InAppPurchaseInfo { public fileprivate(set) var quantity: UInt64? public fileprivate(set) var productId: String? public fileprivate(set) var transactionId: String? public fileprivate(set) var originalTransactionId: String? public fileprivate(set) var purchaseDate: Date? public fileprivate(set) var originalPurchaseDate: Date? public fileprivate(set) var expiresDate: Date? public fileprivate(set) var isInIntroOfferPeriod: UInt64? public fileprivate(set) var cancellationDate: Date? public fileprivate(set) var webOrderLineItemId: UInt64? } func parseDate(_ dateString: String) -> Date? { return ReceiptDateFormatter.date(from: dateString) } public func receipt() -> ReceiptInfo? { guard let block = mainBlock.findOid(.pkcs7data) else { return nil } guard var receiptBlock = block.parent?.sub?.last?.sub(0)?.sub(0) else { return nil } var receiptInfo = ReceiptInfo() if receiptBlock.asString == "Xcode" { receiptBlock = receiptBlock.sub(0)! } for item in receiptBlock.sub ?? [] { let fieldType = (item.sub(0)?.value as? Data)?.uint64Value ?? 0 let fieldValueString = item.sub(2)?.asString switch fieldType { case 2: receiptInfo.bundleIdentifier = fieldValueString receiptInfo.bundleIdentifierData = item.sub(2)?.rawValue case 3: receiptInfo.bundleVersion = fieldValueString case 4: receiptInfo.opaqueValue = item.sub(2)?.rawValue case 5: receiptInfo.sha1 = item.sub(2)?.rawValue case 19: receiptInfo.originalApplicationVersion = fieldValueString case 12: guard let fieldValueString = fieldValueString else { continue } receiptInfo.receiptCreationDateString = fieldValueString receiptInfo.receiptCreationDate = parseDate(fieldValueString) case 21: guard let fieldValueString = fieldValueString else { continue } receiptInfo.receiptExpirationDateString = fieldValueString receiptInfo.receiptExpirationDate = parseDate(fieldValueString) case 17: let subItems = item.sub(2)?.sub?.first?.sub ?? [] if receiptInfo.inAppPurchases == nil { receiptInfo.inAppPurchases = [] } receiptInfo.inAppPurchases?.append(inAppPurchase(subItems)) default: break } } return receiptInfo } private func inAppPurchase(_ subItems: [ASN1Object]) -> InAppPurchaseInfo { var inAppPurchaseInfo = InAppPurchaseInfo() subItems.forEach { subItem in let fieldType = (subItem.sub(0)?.value as? Data)?.uint64Value ?? 0 let fieldValue = subItem.sub(2)?.sub?.first?.value switch fieldType { case 1701: inAppPurchaseInfo.quantity = (fieldValue as? Data)?.uint64Value case 1702: inAppPurchaseInfo.productId = fieldValue as? String case 1703: inAppPurchaseInfo.transactionId = fieldValue as? String case 1705: inAppPurchaseInfo.originalTransactionId = fieldValue as? String case 1704: if let fieldValueString = fieldValue as? String { inAppPurchaseInfo.purchaseDate = parseDate(fieldValueString) } case 1706: if let fieldValueString = fieldValue as? String { inAppPurchaseInfo.originalPurchaseDate = parseDate(fieldValueString) } case 1708: if let fieldValueString = fieldValue as? String { inAppPurchaseInfo.expiresDate = parseDate(fieldValueString) } case 1719: inAppPurchaseInfo.isInIntroOfferPeriod = (fieldValue as? Data)?.uint64Value case 1712: if let fieldValueString = fieldValue as? String { inAppPurchaseInfo.cancellationDate = parseDate(fieldValueString) } case 1711: inAppPurchaseInfo.webOrderLineItemId = (fieldValue as? Data)?.uint64Value default: break } } return inAppPurchaseInfo } } // MARK: ReceiptDateFormatter /// Static formatting methods to use for string encoded date values in receipts private enum ReceiptDateFormatter { /// Uses receipt-conform representation of dates like "2017-01-01T12:00:00Z", /// as a fallback, dates like "2017-01-01T12:00:00.123Z" are also parsed. static func date(from string: String) -> Date? { return self.defaultDateFormatter.date(from: string) // expected ?? self.fallbackDateFormatterWithMS.date(from: string) // try again with milliseconds } /// Uses receipt-conform representation of dates like "2017-01-01T12:00:00Z" (rfc3339 without millis) private static let defaultDateFormatter: DateFormatter = { let dateDateFormatter = DateFormatter() dateDateFormatter.locale = Locale(identifier: "en_US_POSIX") dateDateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZZZ" dateDateFormatter.timeZone = TimeZone(secondsFromGMT: 0) return dateDateFormatter }() /// Uses representation of dates like "2017-01-01T12:00:00.123Z" /// /// This is not the officially intended format, but added after hearing reports about new format adding ms https://twitter.com/depth42/status/1314179654811607041 /// /// The formatting String was taken from https://github.com/IdeasOnCanvas/AppReceiptValidator/pull/73 /// where tests were performed to check if it works private static let fallbackDateFormatterWithMS: DateFormatter = { let dateFormatter = DateFormatter() dateFormatter.locale = Locale(identifier: "en_US_POSIX") dateFormatter.dateFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'SSS'Z'" dateFormatter.timeZone = TimeZone(secondsFromGMT: 0) return dateFormatter }() } // swiftlint:enable all