passport-config.js

const LocalStrategy = require('passport-local').Strategy
const bcrypt = require('bcrypt')
const User = require('./models/user_model')

const GoogleStrategy = require('passport-google-oauth').OAuth2Strategy;
const GOOGLE_CLIENT_ID = process.env.GOOGLE_CLIENT_ID
const GOOGLE_CLIENT_SECRET = process.env.GOOGLE_CLIENT_SECRET
const uri = process.env.CALLBACK_URI



function initialize(passport, getUserByEmail, getUserById) {
  const authenticateUser = async (email, password, done) => {
    const user = await User.findOne({email: email});
    if (user == null) {
      return done(null, false, { message: 'No user with that email' })
    }    

    try {
      if (await bcrypt.compare(password, user.password)) {
        return done(null, user)
      } else {
        return done(null, false, { message: 'Password incorrect' })
      }
    } catch (e) {
      return done(e)
    }
  }

  passport.use(new LocalStrategy({ usernameField: 'email' }, authenticateUser))
  passport.use(new GoogleStrategy({
    clientID: GOOGLE_CLIENT_ID,
    clientSecret: GOOGLE_CLIENT_SECRET,
    callbackURL: uri
  },
  function(accessToken, refreshToken, profile, done) {
      userProfile=profile;
      return done(null, userProfile);
  }
  ));

  passport.serializeUser((user, done) => done(null, user.id))
  passport.deserializeUser((id, done) => {
    return done(null, getUserById(id))
  })
}

module.exports = initialize