Read features from app store receipt

- Use Kvitto to parse App Store receipt
- Infer feature/provider eligibility from features
- Assume full version in beta
- Read receipt even if no products were purchased

Passepartout-iOS/Global/ProductManager.swift

@@ -26,14 +26,33 @@
 import Foundation
 import StoreKit
 import Convenience
+import SwiftyBeaver
+import Kvitto
+import PassepartoutCore
+
+private let log = SwiftyBeaver.self
+
+class ProductManager: NSObject {
+    private static let lastFullVersionNumber = "1.8.1"
+
+    private static let lastFullVersionBuild = "2016"
 
-struct ProductManager {
     static let shared = ProductManager()
     
     private let inApp: InApp<Product>
     
-    private init() {
+    private var purchasedAppVersion: String?
+    
+    private var purchasedFeatures: Set<Product>
+    
+    private override init() {
         inApp = InApp()
+        purchasedAppVersion = nil
+        purchasedFeatures = []
+        
+        super.init()
+
+        reloadReceipt()
     }
     
     func listProducts(completionHandler: (([SKProduct]) -> Void)?) {
@@ -47,6 +66,75 @@ struct ProductManager {
     }
 
     func purchase(_ product: SKProduct, completionHandler: @escaping (InAppPurchaseResult, Error?) -> Void) {
-        inApp.purchase(product: product, completionHandler: completionHandler)
+        inApp.purchase(product: product) {
+            if $0 == .success {
+                self.reloadReceipt()
+            }
+            completionHandler($0, $1)
+        }
+    }
+
+    // MARK: In-app eligibility
+    
+    private func reloadReceipt() {
+        guard let url = Bundle.main.appStoreReceiptURL else {
+            log.warning("No App Store receipt found!")
+            return
+        }
+        guard let receipt = Receipt(contentsOfURL: url) else {
+            log.error("Could not parse App Store receipt!")
+            return
+        }
+
+        purchasedAppVersion = receipt.originalAppVersion
+        purchasedFeatures.removeAll()
+
+        if let version = purchasedAppVersion {
+            log.debug("Original purchased version: \(version)")
+
+            // treat former purchases as full versions
+            if version <= ProductManager.lastFullVersionNumber {
+                purchasedFeatures.insert(.fullVersion)
+            }
+        }
+        if let iapReceipts = receipt.inAppPurchaseReceipts {
+            log.debug("In-app receipts:")
+            iapReceipts.forEach {
+                guard let pid = $0.productIdentifier, let date = $0.originalPurchaseDate else {
+                    return
+                }
+                log.debug("\t\(pid) [\(date)]")
+            }
+            for r in iapReceipts {
+                guard let pid = r.productIdentifier, let product = Product(rawValue: pid) else {
+                    continue
+                }
+                purchasedFeatures.insert(product)
+            }
+        }
+        log.info("Purchased features: \(purchasedFeatures)")
+    }
+
+    func isFullVersion() -> Bool {
+        guard !AppConstants.Flags.isBeta else {
+            return true
+        }
+        return purchasedFeatures.contains(.fullVersion)
+    }
+    
+    func isEligible(forFeature feature: Product) -> Bool {
+        guard !isFullVersion() else {
+            return true
+        }
+        return purchasedFeatures.contains(feature)
+    }
+
+    func isEligible(forProvider name: Infrastructure.Name) -> Bool {
+        guard !isFullVersion() else {
+            return true
+        }
+        return purchasedFeatures.contains {
+            return $0.rawValue.hasSuffix("providers.\(name.rawValue)")
+        }
     }
 }

Podfile

@@ -21,6 +21,7 @@ end
 
 target 'PassepartoutCore-iOS' do
     shared_pods
+    pod 'Kvitto'
 end
 
 target 'Passepartout-iOS' do

Podfile.lock

@@ -10,6 +10,14 @@ PODS:
   - Convenience/Persistence (0.0.1)
   - Convenience/Reviewer (0.0.1)
   - Convenience/Tables (0.0.1)
+  - DTFoundation/Core (1.7.14)
+  - DTFoundation/DTASN1 (1.7.14):
+    - DTFoundation/Core
+  - Kvitto (1.0.3):
+    - DTFoundation/DTASN1 (~> 1.7.13)
+    - Kvitto/Core (= 1.0.3)
+  - Kvitto/Core (1.0.3):
+    - DTFoundation/DTASN1 (~> 1.7.13)
   - MBProgressHUD (1.1.0)
   - OpenSSL-Apple (1.1.0l.4)
   - SSZipArchive (2.2.2)
@@ -35,6 +43,7 @@ DEPENDENCIES:
   - Convenience/Persistence (from `https://github.com/keeshux/convenience`, commit `b990a8c`)
   - Convenience/Reviewer (from `https://github.com/keeshux/convenience`, commit `b990a8c`)
   - Convenience/Tables (from `https://github.com/keeshux/convenience`, commit `b990a8c`)
+  - Kvitto
   - MBProgressHUD
   - SSZipArchive
   - TunnelKit/Extra/LZO (from `https://github.com/passepartoutvpn/tunnelkit`, commit `4d930d3`)
@@ -42,6 +51,8 @@ DEPENDENCIES:
 
 SPEC REPOS:
   https://github.com/cocoapods/specs.git:
+    - DTFoundation
+    - Kvitto
     - MBProgressHUD
     - OpenSSL-Apple
     - SSZipArchive
@@ -64,13 +75,15 @@ CHECKOUT OPTIONS:
     :git: https://github.com/passepartoutvpn/tunnelkit
 
 SPEC CHECKSUMS:
-  Convenience: c2bc96be4ca77c7018f85b2c63b95c2a44c05c5a
+  Convenience: c4240c936b2119752ffa0841d40a4bc6a0ba8a5d
+  DTFoundation: 25aa19bb7c6e225b1dfae195604fb8cf1da0ab4c
+  Kvitto: d451f893f84ad669850b7cb7d3f8781363e14232
   MBProgressHUD: e7baa36a220447d8aeb12769bf0585582f3866d9
   OpenSSL-Apple: f3d1668588ea8f06b076dcfa6177cd90452e3800
   SSZipArchive: fa16b8cc4cdeceb698e5e5d9f67e9558532fbf23
   SwiftyBeaver: aaf2ebd7dac2e952991f46a82ed24ad642867ae2
   TunnelKit: 0743f0306be0869d51118ac33e274e7507a93537
 
-PODFILE CHECKSUM: f45a3fd3744e646a5513e3e25d447d1550c9fefa
+PODFILE CHECKSUM: d1e12ff38bc1839dddbbbcaa5e436ea0fad60f70
 
 COCOAPODS: 1.8.4