Allow jetpack.com/app to be handled without requiring authentication

Author: dvdchr

WordPress/Classes/System/WordPressAppDelegate.swift

@@ -505,6 +505,14 @@ extension WordPressAppDelegate {
     }
 
     func handleWebActivity(_ activity: NSUserActivity) {
+        // try to handle unauthenticated routes first.
+        if activity.activityType == NSUserActivityTypeBrowsingWeb,
+           let url = activity.webpageURL,
+           UniversalLinkRouter.unauthenticated.canHandle(url: url) {
+            UniversalLinkRouter.unauthenticated.handle(url: url)
+            return
+        }
+
         guard AccountHelper.isLoggedIn,
             activity.activityType == NSUserActivityTypeBrowsingWeb,
             let url = activity.webpageURL else {

WordPress/Classes/Utility/Universal Links/UniversalLinkRouter.swift

@@ -25,6 +25,10 @@ struct UniversalLinkRouter: LinkRouter {
     static let shared = UniversalLinkRouter(
         routes: defaultRoutes)
 
+    // A singleton that handles universal link routes without requiring authentication.
+    //
+    static let unauthenticated = UniversalLinkRouter(routes: jetpackRoutes)
+
     static let defaultRoutes: [Route] =
         redirects +
         meRoutes +