app.js

//jshint esversion:6
require('dotenv').config();
const express = require('express');
const bodyParser = require('body-parser');
const ejs = require('ejs');
const mongoose = require('mongoose');
const session = require('express-session');
const passport = require('passport');
const passportLocalMongoose = require('passport-local-mongoose');
const GoogleStrategy = require('passport-google-oauth20').Strategy;
const FacebookStrategy = require('passport-facebook').Strategy;
const findOrCreate = require('mongoose-findorcreate');

const app = express();
mongoose.connect('mongodb://localhost:27017/userDB', {useNewUrlParser: true, useUnifiedTopology: true});
mongoose.set('useCreateIndex', true);


app.use(express.static('public'));
app.set('view engine', 'ejs');
app.use(bodyParser.urlencoded({
  extended: true
}));

app.use(session({
  secret: "Our little secret.",
  resave: false,
  saveUninitialized: false
}));
app.use(passport.initialize());
app.use(passport.session());

const userSchema = new mongoose.Schema({
  email: String,
  password: String,
  googleId: String,
  facebookId: String,
  secret: String
});


userSchema.plugin(passportLocalMongoose);
userSchema.plugin(findOrCreate);

const User = new mongoose.model('User', userSchema);

passport.use(User.createStrategy());
passport.serializeUser(function(user, done){
  done(null, user.id);
});
passport.deserializeUser(function(id, done){
  User.findById(id, function(err, user){
    done(err, user);
  });
});
passport.use(new GoogleStrategy({
  clientID: process.env.GOOGLE_ID,
  clientSecret: process.env.GOOGLE_SECRET,
  callbackURL: 'http://localhost:3000/auth/google/secrets',
  userProfileURL: 'https://www.googleapis.com/oauth2/v3/userinfo'
  },
  function(accessToken, refreshToken, profile, cb) {
      User.findOrCreate({googleId: profile.id}, function(err, user){
        return cb(err, user);
      });
  }
));
passport.use(new FacebookStrategy({
    clientID: process.env.FACEBOOK_APP_ID,
    clientSecret: process.env.FACEBOOK_APP_SECRET,
    callbackURL: "http://localhost:3000/auth/facebook/secrets"
  },
  function(accessToken, refreshToken, profile, cb) {
    User.findOrCreate({ facebookId: profile.id }, function (err, user) {
      return cb(err, user);
    });
  }
));

app.get('/', function(req, res){
  res.render('home');
});

app.get('/auth/google',
  passport.authenticate('google',{scope: ['profile']})
);

app.get('/auth/google/secrets',
  passport.authenticate('google',{failureRedirect: '/login'}),
  function(req, res){
      //Successful authentication, redirect secrets
      res.redirect('/secrets');
});
app.get('/auth/facebook',
  passport.authenticate('facebook'));

app.get('/auth/facebook/secrets',
  passport.authenticate('facebook', { failureRedirect: '/login' }),
  function(req, res) {
    // Successful authentication, redirect home.
    res.redirect('/secrets');
  });

app.get('/login', function(req, res){
  res.render('login');
});

app.post('/login', function(req, res){
  const user = new User({
    username: req.body.username,
    password: req.body.password
  });

  req.login(user, function(err){
    if (err) {
      console.log(err);
    } else {
      passport.authenticate('locale')(req, res, function(){
        res.redirect('/secrets');
      });
    }
  });
});

app.get('/logout', function(req, res){
  req.logout();
  res.redirect('/');
});

app.get('/secrets', function(req, res){
  User.find({'secret': {$ne: null}}, function(err, foundUsers){
    if (err){
      console.log(err);
    } else {
      if (foundUsers){
        res.render('secrets', {usersWithSecrets: foundUsers});
      }
    }
  });
});

app.get('/submit', function(req, res){
  if (req.isAuthenticated()){
    res.render('submit');
  } else {
    res.redirect('/login');
  }
});

app.post('/submit', function(req, res){
  const submittedSecret = req.body.secret;
  User.findById(req.user.id, function(err, foundUser){
    if (err){
      console.log(err);
    } else {
      if (foundUser) {
        foundUser.secret = submittedSecret;
        foundUser.save(function(){
          res.redirect('/secrets');
        });
      }
    }
  });
});

app.get('/register', function(req, res){
  res.render('register');
});

app.post('/register', function(req, res){
  User.register({username: req.body.username}, req.body.password, function(err, user){
    if (err){
      console.log(err);
      res.redirect('/register');
    } else {
      passport.authenticate('local')(req, res, function(){
        res.redirect('/secrets');
      });
    }
  });
});


app.listen(3000, function() {
  console.log('Server started on port 3000.');
});