server.js

const express = require('express');
const path = require('path');
const handlebars = require('express-handlebars');
const hbs = require('handlebars');
const mongoose = require('mongoose');
const cookieParser = require('cookie-parser');
const session = require('express-session');
const passport = require('passport');
const bodyParser = require('body-parser');
const methodOverride = require('method-override');

// Import function exported by newly installed node modules.
const {
  allowInsecurePrototypeAccess,
} = require('@handlebars/allow-prototype-access');

// Load Models
require('./models/User');
require('./models/Quiz');
require('./models/Topic');

// Passport Config
require('./config/passport')(passport);

// Handlebars Helpers
const {
  equality,
  loop,
  select,
  add,
  length,
  includes,
} = require('./helpers/hbs');

// Load Routes
const home = require('./routes/index');
const auth = require('./routes/auth');
const quiz = require('./routes/quiz');
const topics = require('./routes/topics');
const user = require('./routes/user');

// Load Keys
const keys = require('./config/keys');

// Map global promises
mongoose.Promise = global.Promise;
// Mongoose Connect
mongoose
  .connect(keys.mongoURI, {
    useUnifiedTopology: true,
    useNewUrlParser: true,
  })
  .then(() => console.log('MongoDB Connected'))
  .catch((err) => console.log(err));

const app = express();

// Body Parser Middleware
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

// Method Override Middelware
app.use(methodOverride('_method'));

app.set('views', path.join(__dirname, '/views'));

// Handlebars Middleware
app.engine(
  'hbs',
  handlebars({
    helpers: {
      equality: equality,
      select: select,
      add: add,
      loop: loop,
      length: length,
      includes: includes,
    },
    layoutsDir: path.join(__dirname, '/views', '/layouts'),
    partialsDir: path.join(__dirname, '/views', '/partials'),
    extname: 'hbs',
    defaultLayout: 'layout',
    handlebars: allowInsecurePrototypeAccess(hbs),
  })
);
app.set('view engine', 'hbs');

app.use(cookieParser());
app.use(
  session({
    secret: 'secret',
    resave: false,
    saveUninitialized: false,
  })
);

// Set static folder
app.use(express.static(path.join(__dirname, 'public')));

// Passport Middleware
app.use(passport.initialize());
app.use(passport.session());

// Set global vars
app.use((req, res, next) => {
  res.locals.user = req.user || null;
  next();
});

// Use Routes
app.use('/auth', auth);
app.use('/quiz', quiz);
app.use('/topics', topics);
app.use('/user', user);
app.use('/', home);

const PORT = process.env.PORT || 5500;

app.listen(PORT, () =>
  console.log(`Server started on port ${PORT}\nhttp://localhost:${PORT}`)
);