text: /**
   * 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 sass = require('node-sass-middleware');
  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' });
  
  /**
   * Controllers (route handlers).
   */
  const homeController = require('./controllers/home');
  const userController = require('./controllers/user');
  const apiController = require('./controllers/api');
  const contactController = require('./controllers/contact');
  const categoryController = require('./controllers/category');
  
  /**
   * API keys and Passport configuration.
   */
  const passportConfig = require('./config/passport');
  
  /**
   * Create Express server.
   */
  const app = express();
  
  /**
   * Connect to MongoDB.
   */
  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', () => {
    console.log('%s MongoDB connection error. Please make sure MongoDB is running.', chalk.red('✗'));
    process.exit();
  });
  
  /**
   * Express configuration.
   */
  app.set('port', process.env.PORT || 3000);
  app.set('views', path.join(__dirname, 'views'));
  app.set('view engine', 'pug');
  app.use(compression());
  app.use(sass({
    src: path.join(__dirname, 'public'),
    dest: path.join(__dirname, 'public')
  }));
  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
    })
  }));
  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) => {
    res.locals.user = req.user;
    next();
  });
  app.use(function(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;
    }
    next();
  });
  app.use(express.static(path.join(__dirname, 'public'), { maxAge: 31557600000 }));
  
  /**
   * Primary app routes.
   */
  app.get('/', homeController.index);
  app.get('/login', userController.getLogin);
  app.post('/login', userController.postLogin);
  app.get('/logout', userController.logout);
  app.get('/forgot', userController.getForgot);
  app.post('/forgot', userController.postForgot);
  app.get('/reset/:token', userController.getReset);
  app.post('/reset/:token', userController.postReset);
  app.get('/signup', userController.getSignup);
  app.post('/signup', userController.postSignup);
  app.get('/contact', contactController.getContact);
  app.post('/contact', contactController.postContact);
  app.get('/account', passportConfig.isAuthenticated, userController.getAccount);
  app.post('/account/profile', passportConfig.isAuthenticated, userController.postUpdateProfile);
  app.post('/account/password', passportConfig.isAuthenticated, userController.postUpdatePassword);
  app.post('/account/delete', passportConfig.isAuthenticated, userController.postDeleteAccount);
  app.get('/account/unlink/:provider', passportConfig.isAuthenticated, userController.getOauthUnlink);
  app.get('/category/new', passportConfig.isAuthenticated, categoryController.getNewCategory);
  app.post('/category/new', passportConfig.isAuthenticated, categoryController.postNewCategory);
  app.get('/category', passportConfig.isAuthenticated, categoryController.getAllCategory);
  
  
  /**
   * Error Handler.
   */
  app.use(errorHandler());
  
  
  app.get('*', function(req, res){
    res.send('No page Found', 404);
  });
  
  /**
   * Start Express server.
   */
  app.listen(app.get('port'), () => {
    console.log('%s Express server listening on port %d in %s mode.', chalk.green('✓'), app.get('port'), app.get('env'));
  });
  
  module.exports = app;
  