auth.js

const passport = require('passport');
const LocalStrategy = require('passport-local');
const GitHubStrategy = require('passport-github').Strategy;
const bcrypt = require('bcrypt');
const ObjectID = require('mongodb').ObjectID;
const dotenv = require('dotenv');


dotenv.config();

module.exports = function(app, myDataBase) {

  app.use(passport.initialize());
  app.use(passport.session())
  
  passport.serializeUser((user, done) => {
    done(null, user._id);
  });

  passport.deserializeUser((id, done) => {
    myDataBase.findOne({_id: new ObjectID(id)}, (err, doc) => {
      done(null, doc);
    });
  });

  passport.use(new LocalStrategy(
    function(username, password, done) {
      myDataBase.findOne({ username: username }, function(err, user) {
        console.log('User ' + username + ' attempted to log in');
        if (err) { return done(err); }
        if (!user) { return done(null, false); }
        if (!bcrypt.compareSync(password, user.password)) { return done(null, false); }
        return done(null, user);
      });
    }
  ));

  passport.use(new GitHubStrategy({
    clientID: process.env.GITHUB_CLIENT_ID,
    clientSecret: process.env.GITHUB_CLIENT_SECRET,
    callbackURL: "https://boilerplate-advancednode.gitaud.repl.co/auth/github/callback" 
  }, function(accessToken, refreshToken, profile, cb) {
    // console.log(profile);
    // Database logic here
    myDataBase.findOneAndUpdate(
      { id: profile.id },
      {
        $setOnInsert: {
          id: profile.id,
          name: profile.displayName || 'John Doe',
          photo: profile._json.avatar_url || '',
          email: Array.isArray(profile.emails) ? profile.emails[0].value : 'No public email',
          created_on: new Date(),
          provider: profile.provider || ''
        },
        $set: {
          last_login: new Date()
        },
        $inc: {
          login_count: 1
        }
      },
      {upsert: true, new: true },
      (err, doc) => {
        return cb(null, doc.value);
      }
    );
  }));
}