Obtain a new token by refresh token with google_sign_in Flutter

Question

I'm writing an application that call google fit rest api from Flutter.

I need to sign with google using (https://pub.dev/packages/google_sign_in). I can obtain a token without problem (see Did anyone manage to get the id token from google sign in (Flutter)) but how to obtain a new token when it is expired?

I dont' want to ask to the user to login and obtain a new token every hour

Answer 1

You can do this in 2 ways.

1. You can use the API.

2. I don't know if this is standard but you can do a silent login every time the user opens the app, the silent log logs into the user account without user interaction and this way you have a new token. Like this:

Future<String> refreshToken() async {
    print("Token Refresh");
    final GoogleSignInAccount googleSignInAccount =
        await googleSignIn.signInSilently();
    final GoogleSignInAuthentication googleSignInAuthentication =
        await googleSignInAccount.authentication;

    final AuthCredential credential = GoogleAuthProvider.getCredential(
      accessToken: googleSignInAuthentication.accessToken,
      idToken: googleSignInAuthentication.idToken,
    );
    final AuthResult authResult = await auth.signInWithCredential(credential);

    return googleSignInAuthentication.accessToken; // New refreshed token
  }