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

Question

I wanna check if the user has still a valid session, before I present the Home View controller of my app. I use the latest Firebase API. I think if I use the legacy, I\'ll be ab

Answer 1

While you can see if there is such a user using Auth.auth().currentUser, this will only be telling you if there was a user authenticated, regardless of whether that users account still exists or is valid.

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Complete Solution

The real solution to this should be using Firebase's re-authentication:

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

This assures (upon the launch of the application) that the previously signed in / authenticated user still in fact is 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.
  }
}