app.js

/**
 * Module dependencies.
 */
const express = require('express');
const compression = require('compression');
const session = require('express-session');
const bodyParser = require('body-parser');
const logger = require('morgan');
const chalk = require('chalk');
const errorHandler = require('errorhandler');
const lusca = require('lusca');
const dotenv = require('dotenv');
const MongoStore = require('connect-mongo')(session);
const flash = require('express-flash');
const path = require('path');
const mongoose = require('mongoose');
const passport = require('passport');
const expressValidator = require('express-validator');
const expressStatusMonitor = require('express-status-monitor');
const multer = require('multer');
const upload = multer({ dest: path.join(__dirname, 'uploads') });

/**
 * Load environment variables from .env file, where API keys and passwords are configured.
 */
dotenv.load({ path: '.env.example' });

/**
 * API keys and Passport configuration.
 */
const passportConfig = require('./config/passport');

/**
 * Create Express & Socket.io servers.
 */
const socketIoPort = 3001;
const app = express();
const server = require('http').Server(app);
const io = require('socket.io')(socketIoPort);

/**
 * Connect to MongoDB.
 */
mongoose.Promise = global.Promise;
mongoose.connect(process.env.MONGODB_URI || process.env.MONGOLAB_URI);
mongoose.connection.on('connected', () => {
  console.log('%s MongoDB connection established!', chalk.green('✓'));
});
mongoose.connection.on('error', (err) => {
  console.error(err);
  console.log('%s MongoDB connection error. Please make sure MongoDB is running.', chalk.red('✗'));
  process.exit();
});

/**
 * Express configuration.
 */
app.set('port', process.env.PORT || 1337);
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

// Middleware for Jade/Pug custom filter for use with Laravel Mix
app.use((req, res, next) => {
  app.locals.filters = {
    'mix': (text, options) => {
      if (!text) return
      text = text.replace(/["']/g, '')

      const manifest = require(__dirname + '/public/mix-manifest.json')
      if (options.css) return `<link rel="stylesheet" href="${manifest[text]}">`
      if (options.js) return `<script type="text/javascript" src="${manifest[text]}"></script>`
    }
  }
  next();
});

app.use(expressStatusMonitor({ websocket: io, port: socketIoPort }));
app.use(compression());
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(expressValidator());
app.use(session({
  resave: true,
  saveUninitialized: true,
  secret: process.env.SESSION_SECRET,
  store: new MongoStore({
    url: process.env.MONGODB_URI || process.env.MONGOLAB_URI,
    autoReconnect: true,
    clear_interval: 3600
  })
}));
app.use(passport.initialize());
app.use(passport.session());
app.use(flash());
app.use((req, res, next) => {
  if (req.path === '/api/upload') {
    next();
  } else {
    lusca.csrf()(req, res, next);
  }
});
app.use(lusca.xframe('SAMEORIGIN'));
app.use(lusca.xssProtection(true));
app.use((req, res, next) => {
  // provide host to construct url to socketio (port 3001)
  res.locals.hostname = req.protocol + '://' + req.hostname
  res.locals.fullHostname = req.protocol + '://' + req.hostname + ':' + req.app.settings.port
  res.locals.user = req.user;
  next();
});
app.use((req, res, next) => {
  // After successful login, redirect back to the intended page
  if (!req.user &&
      req.path !== '/login' &&
      req.path !== '/signup' &&
      !req.path.match(/^\/auth/) &&
      !req.path.match(/\./)) {
    req.session.returnTo = req.path;
  } else if (req.user &&
      req.path == '/account') {
    req.session.returnTo = req.path;
  }
  next();
});
app.use(express.static(path.join(__dirname, 'public'), { maxAge: 31557600000 }));

/**
 * Primary app routes.
 */
require('./config/routes')(app, passport, passportConfig, upload);

/**
 * Error Handler.
 */
app.use(errorHandler());

/**
 * Socket.io.
 */
io.on('connection', (socket) => {
  socket.emit('greet', { hello: 'Hey there browser!' });
  socket.on('respond', (data) => {
    console.log(data);
  });
  socket.on('disconnect', () => {
    console.log('Socket disconnected');
  });
});

/**
 * Start Express server.
 */
server.listen(app.get('port'), () => {
  const host = (app.get('env') === 'development') ? 'http://localhost:%d' : 'port %d';
  console.log('%s Express server listening on ' + host + ' in %s mode.', chalk.green('✓'), app.get('port'), app.get('env'));
});

module.exports = app;