How to check if a user has a valid Auth Session Firebase iOS?

Question

I want to check if the user has a valid session before I submit the Home View controller of my application. I use the latest Firebase API. I think that if I use this legacy, I can find out.

Here is what I have done so far:

• I posted my question in the Slack Firebase community, no one answers. I found this, but this is for Android: https://groups.google.com/forum/?hl=el#!topic/firebase-talk/4HdhDvVRqHc

• I tried reading Firebase documents for iOS, but I can’t understand them: https://firebase.google.com/docs/reference/ios/firebaseauth/interface_f_i_r_auth p>

I tried typing in Xcode like this:

FIRApp().currentUser() FIRUser().getCurrentUser() 

But I can not find this getCurrentUser function.

Answer 1

 if FIRAuth.auth().currentUser != nil { presentHome() } else { //User Not logged in } 

For updated SDK

 if Auth.auth().currentUser != nil { } 

Answer 2

Updated Answer

Solution for Latest Firebase SDK - DOCS

  // save a ref to the handler private var authListener: AuthStateDidChangeListenerHandle? // Check for auth status some where override func viewWillAppear(_ animated: Bool) { super.viewWillAppear(animated) authListener = Auth.auth().addStateDidChangeListener { (auth, user) in if let user = user { // User is signed in // let the user in? if user.isEmailVerified { // Optional - check if the user verified their email too // let the user in? } } else { // No user } } } // Remove the listener once it no longer needed deinit { if let listener = authListener { Auth.auth().removeStateDidChangeListener(authListener) } } 

Original solution

Solution in Swift 3

 override func viewDidLoad() { super.viewDidLoad() FIRAuth.auth()!.addStateDidChangeListener() { auth, user in if user != nil { self.switchStoryboard() } } } 

Where switchStoryboard() is located

 func switchStoryboard() { let storyboard = UIStoryboard(name: "NameOfStoryboard", bundle: nil) let controller = storyboard.instantiateViewController(withIdentifier: "ViewControllerName") as UIViewController self.present(controller, animated: true, completion: nil) } 

A source

Answer 3

 if Auth.auth().currentUser?.uid != nil { //user is logged in }else{ //user is not logged in } 

Answer 4

Solution in Swift 4

 override func viewDidLoad() { super.viewDidLoad() setupLoadingControllerUI() checkIfUserIsSignedIn() } private func checkIfUserIsSignedIn() { Auth.auth().addStateDidChangeListener { (auth, user) in if user != nil { // user is signed in // go to feature controller } else { // user is not signed in // go to login controller } } } 

Answer 5

Although you can see if there is such a user that uses Auth.auth().currentUser , this will only tell you if the user has been authenticated, regardless of whether this user account exists or exists.

---

Complete solution

The real solution for this should be to use Firebase re-authentication:

 open func reauthenticate(with credential: AuthCredential, completion: UserProfileChangeCallback? = nil) 

This ensures (after starting the application) that the previously signed user / authenticated user is still and can be authenticated through Firebase.

 let user = Auth.auth().currentUser // Get the previously stored current user var credential: AuthCredential user?.reauthenticate(with: credential) { error in if let error = error { // An error happened. } else { // User re-authenticated. } } 

Answer 6

 override func viewDidLoad() { FIRAuth.auth()!.addStateDidChangeListener() { auth, user in // 2 if user != nil { let vc = self.storyboard?.instantiateViewController(withIdentifier: "Home") self.present(vc!, animated: true, completion: nil) } } } 

Source: https://www.raywenderlich.com/139322/firebase-tutorial-getting-started-2

Answer 7

The solution to task-c would be (iOS 11.4):

 [FIRAuth.auth addAuthStateDidChangeListener:^(FIRAuth * _Nonnull auth, FIRUser * _Nullable user) { if (user != nil) { // your logic } }];