google auth 2 0 passport

1var GoogleStrategy = require( 'passport-google-oauth2' ).Strategy;
2
3passport.use(new GoogleStrategy({
4    clientID:     GOOGLE_CLIENT_ID,
5    clientSecret: GOOGLE_CLIENT_SECRET,
6    callbackURL: "http://yourdomain:3000/auth/google/callback",
7    passReqToCallback   : true
8  },
9  function(request, accessToken, refreshToken, profile, done) {
10    User.findOrCreate({ googleId: profile.id }, function (err, user) {
11      return done(err, user);
12    });
13  }
14));
15