present app clip

modules/BlueskyClip/ViewController.swift

@@ -1,26 +1,95 @@
 import UIKit
 import WebKit
+import StoreKit
 
-class ViewController: UIViewController {
+class ViewController: UIViewController, WKScriptMessageHandler {
+  let defaults = UserDefaults(suiteName: "group.app.bsky")
+  
+  var window: UIWindow
   var webView: WKWebView?
+  var userContentController: WKUserContentController?
+  
+  var starterPackUrl: URL?
+  
+  init(window: UIWindow) {
+    self.window = window
+    super.init(nibName: nil, bundle: nil)
+  }
+  
+  required init?(coder: NSCoder) {
+    fatalError("init(coder:) has not been implemented")
+  }
   
   override func viewDidLoad() {
     super.viewDidLoad()
-
-    let webView = WKWebView(frame: self.view.bounds)
+    
+    let contentController = WKUserContentController()
+    contentController.add(self, name: "onMessage")
+    let configuration = WKWebViewConfiguration()
+    configuration.userContentController = contentController
+    
+    let webView = WKWebView(frame: self.view.bounds, configuration: configuration)
     webView.translatesAutoresizingMaskIntoConstraints = false
     webView.contentMode = .scaleToFill
-
+    
     self.view.addSubview(webView)
     
     self.webView = webView
   }
   
+  func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
+    guard let response = message.body as? String,
+          let data = response.data(using: .utf8, allowLossyConversion: false),
+          let payload = try? JSONDecoder().decode(WebViewActionPayload.self, from: data)
+    else {
+      return
+    }
+    
+    switch payload.action {
+    case .present:
+      guard let url = self.starterPackUrl else {
+        return
+      }
+      
+      self.presentAppStoreOverlay()
+      defaults?.setValue(url.absoluteString, forKey: "appClipStarterPackUri")
+      
+    case .store:
+      guard let keyToStoreAs = payload.keyToStoreAs, let jsonToStore = payload.jsonToStore else {
+        return
+      }
+      
+      self.defaults?.setValue(jsonToStore, forKey: keyToStoreAs)
+    }
+  }
+  
   func handleURL(url: URL) {
+    self.starterPackUrl = url
     let urlString = "\(url.absoluteString)?clip=true"
     
     if let url = URL(string: urlString) {
       self.webView?.load(URLRequest(url: url))
     }
   }
+  
+  func presentAppStoreOverlay() {
+    guard let windowScene = self.window.windowScene else {
+      return
+    }
+    
+    let configuration = SKOverlay.AppClipConfiguration(position: .bottomRaised)
+    let overlay = SKOverlay(configuration: configuration)
+    
+    overlay.present(in: windowScene)
+  }
+}
+
+struct WebViewActionPayload: Decodable {
+  enum Action: String, Decodable {
+    case present, store
+  }
+  
+  let action: Action
+  let keyToStoreAs: String?
+  let jsonToStore: String?
 }