Dactyloidae iOS initial commit

mobile/ios/Client/Helpers/UserActivityHandler.swift

@@ -0,0 +1,71 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+import Shared
+import Storage
+import CoreSpotlight
+import MobileCoreServices
+import WebKit
+
+private let browsingActivityType: String = "org.mozilla.ios.firefox.browsing"
+
+private let searchableIndex = CSSearchableIndex(name: "firefox")
+
+class UserActivityHandler {
+    private var tabObservers: TabObservers!
+
+    init() {
+        self.tabObservers = registerFor(
+                                .didLoseFocus,
+                                .didGainFocus,
+                                .didChangeURL,
+                                // .didLoadMetadata // TODO: Bug 1390294
+                                // .didLoadFavicon, // TODO: Bug 1390294
+                                .didClose,
+                                queue: .main)
+    }
+
+    deinit {
+        unregister(tabObservers)
+    }
+
+    class func clearSearchIndex(completionHandler: ((Error?) -> Void)? = nil) {
+        searchableIndex.deleteAllSearchableItems(completionHandler: completionHandler)
+    }
+}
+
+extension UserActivityHandler: TabEventHandler {
+    func tabDidGainFocus(_ tab: Tab) {
+        tab.userActivity?.becomeCurrent()
+    }
+
+    func tabDidLoseFocus(_ tab: Tab) {
+        tab.userActivity?.resignCurrent()
+    }
+
+    func tab(_ tab: Tab, didChangeURL url: URL) {
+        guard url.isWebPage(includeDataURIs: false), !url.isLocal else {
+            tab.userActivity?.resignCurrent()
+            tab.userActivity = nil
+            return
+        }
+
+        tab.userActivity?.invalidate()
+
+        let userActivity = NSUserActivity(activityType: browsingActivityType)
+        userActivity.webpageURL = url
+        userActivity.becomeCurrent()
+
+        tab.userActivity = userActivity
+    }
+
+    func tabDidClose(_ tab: Tab) {
+        guard let userActivity = tab.userActivity else {
+            return
+        }
+        tab.userActivity = nil
+        userActivity.invalidate()
+    }
+}