Firebase Auth Anonymous Login

Question

When using Firebase Auth Anonymous Account it occasionally creates a new UserID in the system and sometimes it uses the same UserID. I really want this to create the same Us

Answer 1

So, in my case I wanted to show a login screen with signup but also the option to Skip login. If the user skips the login multiple times, I was doing signInAnonymous which I though it was reusing the user, but no.

So I solved it like this:

componentDidMount() {

    this.unsubscriber = firebase.auth().onAuthStateChanged((user) => {
      this.setState({ user: user, loadingUser: false}, () => {
        if (this.state.user != null && this.state.user.isAnonymous == false)
          this.startApp();
      });
    });

  }




skip = () => {
    this.setState({loading: true}, () => {
      if (this.state.user != null && this.state.user.isAnonymous == true)
        this.startApp();
      else {
        firebase.auth().signInAnonymouslyAndRetrieveData().then((result) => {
          this.setState({user: result.user}, () => {
            this.startApp()
          })
        })
        .catch(err => {
          this.setState({loading: false});
          alert(err)
        });
      }

    });

  }

Code is React Native but it should help you see the logic. I wait for the auth state and store the user temporarly. If it is not anonymous I start the home screen. If it is anonymous I give the user the option to register. If it still wants to skip, then I just start the app so I can re use the ID.

Answer 2

You can use the Custom Auth System. Since the "Play as Guest" will only be specified for a special device. You can use Device ID as the CustomToken and then call Firebase Authentication Method:

auth.SignInWithCustomTokenAsync(custom_token).ContinueWith{.......

You can provide "custom_token" as the Device ID. You can get Device ID by:

string deviceID = SystemInfo.deviceUniqueIdentifier;

Hope this helps...

Answer 3

When you call SignOut, your guest will signout forever. If you want to keep your guest, don't call SignOut method.