how to get a new acces token to interact with Google Api with firebase authentication in angular?

Question

users log into my angular application via firebasebase provider.

new firebase.auth.GoogleAuthProvider()

successively

firebase.auth().getRedirectResult()

When the application accesses I only have a token like

ya29.a0AfH6SMAYg1A1RLwrEGe19qozweR9AFXuLJwSHb4FzQvuXk-ObVa54mpErd09mb4G3***********

that expires after a short time. How do I increase the deadline time as the official google documentation says?

Update

firebase.auth().getRedirectResult().then(function(result) {

 if (result.credential) {
    // This gives you a Google Access Token.
    var token = result.credential.accessToken;
  }
  var user = result.user;
});

I would like to get this token but with extended expiration

Answer 1

SOLUTION:

Step 1:
i have installed ng-gapi in my angular project. (and configured it)

Step 2:
through google ng-gapi i logged in

 this.gapiService.getAuth()
  .subscribe((auth) => {
    auth.signIn().then(res => this.signInSuccessHandler(res));
  });

Step 3:
i login in firebase mannualy as documentation said

Step 4:
now through ng-gapi i can get the token

this.gapiService.getAuth().subscribe(x => {
  console.log(x.Od.$B);
});

(i don't know if exist a poper function to get x.Od.$B but it's work)