Restore provider flow after purchase

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - "Trusted networks" settings are now saved per profile. [#114](https://github.com/passepartoutvpn/passepartout-ios/issues/114)
 - Require explicit `--ca` and `--cipher` in .ovpn configuration file.
+- Restore provider flow after purchase.
 
 ### Fixed
 

Passepartout-iOS/Global/Macros.swift

@@ -63,10 +63,11 @@ extension UIColor {
 }
 
 extension UIViewController {
-    func presentPurchaseScreen(forProduct product: Product) {
+    func presentPurchaseScreen(forProduct product: Product, delegate: PurchaseViewControllerDelegate? = nil) {
         let nav = StoryboardScene.Purchase.initialScene.instantiate()
         let vc = nav.topViewController as? PurchaseViewController
         vc?.feature = product
+        vc?.delegate = delegate
 
         // enforce pre iOS 13 behavior
         nav.modalPresentationStyle = .fullScreen

Passepartout-iOS/Global/Product.swift

@@ -24,6 +24,7 @@
 //
 
 import Foundation
+import StoreKit
 import PassepartoutCore
 
 struct Product: RawRepresentable, Equatable, Hashable {
@@ -139,3 +140,9 @@ extension Infrastructure.Metadata {
         return Product(providerId: inApp ?? description)
     }
 }
+
+extension Product {
+    func matchesStoreKitProduct(_ skProduct: SKProduct) -> Bool {
+        return skProduct.productIdentifier == rawValue
+    }
+}

Passepartout-iOS/Scenes/Organizer/WizardProviderViewController.swift

@@ -35,6 +35,8 @@ class WizardProviderViewController: UITableViewController, StrongTableHost {
     
     private var createdProfile: ProviderConnectionProfile?
     
+    private var selectedMetadata: Infrastructure.Metadata?
+    
     // MARK: StrongTableHost
     
     let model = StrongTableModel<SectionType, RowType>()
@@ -59,6 +61,8 @@ class WizardProviderViewController: UITableViewController, StrongTableHost {
     }
     
     private func tryNext(withMetadata metadata: Infrastructure.Metadata) {
+        selectedMetadata = metadata
+
         guard ProductManager.shared.isEligible(forProvider: metadata.name) else {
             presentPurchaseScreen(forProduct: metadata.product, delegate: self)
             return
@@ -214,3 +218,14 @@ extension WizardProviderViewController: AccountViewControllerDelegate {
         finish(withCredentials: vc.credentials)
     }
 }
+
+// MARK: -
+
+extension WizardProviderViewController: PurchaseViewControllerDelegate {
+    func purchaseController(_ purchaseController: PurchaseViewController, didPurchase product: Product) {
+        guard let metadata = selectedMetadata else {
+            return
+        }
+        tryNext(withMetadata: metadata)
+    }
+}

Passepartout-iOS/Scenes/Purchase/PurchaseViewController.swift

@@ -30,11 +30,17 @@ import Convenience
 
 private let log = SwiftyBeaver.self
 
+protocol PurchaseViewControllerDelegate: class {
+    func purchaseController(_ purchaseController: PurchaseViewController, didPurchase product: Product)
+}
+
 class PurchaseViewController: UITableViewController, StrongTableHost {
     private var isLoading = true
 
     var feature: Product!
     
+    weak var delegate: PurchaseViewControllerDelegate?
+
     private var skFeature: SKProduct?
 
     private var skFullVersion: SKProduct?
@@ -135,7 +141,14 @@ class PurchaseViewController: UITableViewController, StrongTableHost {
                 }
                 return
             }
-            self?.dismiss(animated: true, completion: nil)
+
+            self?.dismiss(animated: true) {
+                guard let weakSelf = self else {
+                    return
+                }
+                let product = weakSelf.feature.matchesStoreKitProduct(skProduct) ? weakSelf.feature! : .fullVersion
+                weakSelf.delegate?.purchaseController(weakSelf, didPurchase: product)
+            }
         }
     }