api/strategies/googleStrategy.js

const { Strategy: GoogleStrategy } = require('passport-google-oauth20');
const config = require('../../config/loader');
const domains = config.domains;

const User = require('../models/User');

// google strategy
const googleLogin = async () =>
  new GoogleStrategy(
    {
      clientID: process.env.GOOGLE_CLIENT_ID,
      clientSecret: process.env.GOOGLE_CLIENT_SECRET,
      callbackURL: `${domains.server}${process.env.GOOGLE_CALLBACK_URL}`,
      proxy: true,
    },
    async (accessToken, refreshToken, profile, cb) => {
      try {
        const oldUser = await User.findOne({ email: profile.emails[0].value });
        if (oldUser) {
          return cb(null, oldUser);
        }
      } catch (err) {
        console.log(err);
      }

      try {
        const newUser = await new User({
          provider: 'google',
          googleId: profile.id,
          username: profile.name.givenName,
          email: profile.emails[0].value,
          emailVerified: profile.emails[0].verified,
          name: `${profile.name.givenName} ${profile.name.familyName}`,
          avatar: profile.photos[0].value,
        }).save();
        cb(null, newUser);
      } catch (err) {
        console.log(err);
      }
    },
  );

module.exports = googleLogin;