ustk-todolist/config/passport.js

const passport = require('passport');
const mongoose = require('mongoose');
const GoogleStrategy = require('passport-google-oauth').OAuth2Strategy;
const {
  googleClientId,
  googleClientSecret,
  googleCallback,
  googleEnabled,
} = require('./').googleOAuth;

const User = mongoose.model('User');

passport.use(User.createStrategy());

if (googleEnabled) {
  passport.use(
    new GoogleStrategy(
      {
        clientID: googleClientId,
        clientSecret: googleClientSecret,
        callbackURL: googleCallback,
      },
      (accessToken, refreshToken, profile, done) => {
        User.findOrCreate({ googleId: profile.id }, (err, user) =>
          done(err, user),
        );
      },
    ),
  );
}
module.exports = passport;