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diff --git a/AuthSamples/SwiftSample/AppDelegate.swift b/AuthSamples/SwiftSample/AppDelegate.swift
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+++ b/AuthSamples/SwiftSample/AppDelegate.swift
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+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import UIKit
+
+import FirebaseDev // FirebaseCore
+import GoogleSignIn // GoogleSignIn
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+  /** @var kGoogleClientID
+      @brief The Google client ID.
+   */
+  private let kGoogleClientID = AuthCredentials.GOOGLE_CLIENT_ID
+
+  // TODO: add Facebook login support as well.
+
+  /** @var kFacebookAppID
+      @brief The Facebook app ID.
+   */
+  private let kFacebookAppID = AuthCredentials.FACEBOOK_APP_ID
+
+  /** @var window
+      @brief The main window of the app.
+   */
+  var window: UIWindow?
+
+  func application(_ application: UIApplication,
+      didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+    FirebaseApp.configure()
+    GIDSignIn.sharedInstance().clientID = kGoogleClientID
+    return true
+  }
+
+  @available(iOS 9.0, *)
+  func application(_ application: UIApplication, open url: URL,
+      options: [UIApplicationOpenURLOptionsKey : Any]) -> Bool {
+    return GIDSignIn.sharedInstance().handle(url,
+        sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String,
+        annotation: nil)
+  }
+
+  func application(_ application: UIApplication, open url: URL, sourceApplication: String?,
+      annotation: Any) -> Bool {
+    return GIDSignIn.sharedInstance().handle(url, sourceApplication: sourceApplication,
+        annotation: annotation)
+  }
+}