Implement existing Google-SignIn flow in the demo app (#709)

Author: mokagio

Demo/AuthenticatorDemo/AppDelegate.swift

@@ -3,6 +3,13 @@ import UIKit
 @main
 class AppDelegate: UIResponder, UIApplicationDelegate {
 
+    // This is a property defined in `UIApplicationDelegate`. In modern UIKit apps,
+    // `UISceneConfiguration` is responsible for creating and holding the window.
+    //
+    // However, we need to set this anyway because SVProgressHUD accesses it internally and will
+    // crash the app if the value it finds is nil.
+    var window: UIWindow?
+
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
         return true
     }

Demo/AuthenticatorDemo/Info.plist

@@ -2,6 +2,17 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>CFBundleURLTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleTypeRole</key>
+			<string>Editor</string>
+			<key>CFBundleURLSchemes</key>
+			<array>
+				<string>com.googleusercontent.apps.108380595987-ujhrhknecrqli756i72gkcs4aaia6nhb</string>
+			</array>
+		</dict>
+	</array>
 	<key>UIApplicationSceneManifest</key>
 	<dict>
 		<key>UIApplicationSupportsMultipleScenes</key>

Demo/AuthenticatorDemo/SceneDelegate.swift

@@ -10,5 +10,8 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
         window = UIWindow(windowScene: scene)
         window?.rootViewController = UINavigationController(rootViewController: ViewController())
         window?.makeKeyAndVisible()
+
+        // We need to set this relationship to avoid a crash when using SVProgressHUD.
+        (UIApplication.shared.delegate as? AppDelegate)?.window = window
     }
 }

Demo/AuthenticatorDemo/ViewController+WordPressAuthenticator.swift

@@ -25,7 +25,10 @@ extension ViewController {
                 enableSignInWithApple: false,
                 enableSignupWithGoogle: true,
                 enableUnifiedAuth: true,
-                enableUnifiedCarousel: true
+                enableUnifiedCarousel: true,
+                // Notice that this is required as well as `enableSignupWithGoogle` to show the
+                // option to login with Google.
+                enableSocialLogin: true
             ),
             style: WordPressAuthenticatorStyle(
                 // Primary (normal and highlight) is the color of buttons such as "Log in or signup

WordPressAuthenticator/Unified Auth/GoogleAuthenticator.swift

@@ -231,6 +231,10 @@ private extension GoogleAuthenticator {
         }
 
         // Initiate unified path by attempting to login first.
+        //
+        // `SVProgressHUD.show()` will crash in an app that doesn't have a window property in its
+        // `UIApplicationDelegate`, such as those created via the Xcode templates circa version 12
+        // onwards.
         SVProgressHUD.show()
         loginFacade.loginToWordPressDotCom(withSocialIDToken: token, service: SocialServiceName.google.rawValue)
     }