Firebase Authentication Functions for Flutter

auth.dart

import 'package:google_sign_in/google_sign_in.dart';
import 'package:firebase_auth/firebase_auth.dart';


//This contains actual user information
MobFirebaseAuth.FirebaseUser firebaseUser;
//This is the main Firebase auth object
MobFirebaseAuth.FirebaseAuth mobAuth = MobFirebaseAuth.FirebaseAuth.instance;
// For google sign in
final GoogleSignIn objGoogleSignIn = GoogleSignIn();


  //Log in using google
  Future<FirebaseUser> googleSignIn() async {
      //For mobile

      // Step 1
      GoogleSignInAccount googleUser = await objGoogleSignIn.signIn();

      // Step 2
      GoogleSignInAuthentication googleAuth = await googleUser.authentication;
      final AuthCredential credential = GoogleAuthProvider.getCredential(
        accessToken: googleAuth.accessToken,
        idToken: googleAuth.idToken,
      );
      AuthResult _res = await mobAuth.signInWithCredential(credential);
      firebaseUser = _res.user;

      return firebaseUser;

  }