Retrieve the getIdToken from the firebase.User object using TypeScript

import { AngularFireAuth } from 'angularfire2/auth';

import * as firebase from 'firebase/app';

@Injectable()
export class GetRequestsProvider {

  user: firebase.User;
  userIdToken:string;

  constructor(public http: HttpClient, public afAuth: AngularFireAuth, authservices: AuthService) {
      afAuth.authState.subscribe(user => {
        this.user = user;
      });
  }

  getUserToken(){

      this.afAuth.auth.onAuthStateChanged((user) => {

          user.getIdToken().then((idToken)=>{

            this.userIdToken = idToken;
            console.log("Here I successfully retrieve the user token: ", this.userIdToken);
            console.log(typeof(this.userIdToken)); // ‘userIdToken’ type is ‘string’

          });

          console.log("However, the variable ‘userIdToken’ remains undefined here: ", this.userIdToken);
      }     
   }    
}

I am in the process of implementing the getIdToken method from Firebase for authenticating users within my application.

The current issue I am encountering is that despite obtaining the user's token correctly, I am facing difficulty saving it to a variable or utilizing it in other parts of the codebase.

Answer №1

When dealing with functions that return promises (like getIdToken), it's important to understand that they are asynchronous. This means that the execution of the entire chain happens immediately, leading to your console log always occurring before the token is available. The token will only be accessible in the callback function you pass to then, and not a moment sooner. You can only use the token within that callback or by passing it to another function.

Attempting to make getIdToken() synchronous or blocking until the token is available will not work as expected. It's crucial to learn how to handle Firebase APIs asynchronously to properly utilize their functionality.

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