express.js

'use strict';

/**
 * Module dependencies.
 */
var express = require('express'),
	mongoStore = require('connect-mongo')(express),
	flash = require('connect-flash'),
	helpers = require('view-helpers'),
	config = require('./config');
var stylus = require('stylus');

module.exports = function(app, passport, db) {
	app.set('showStackError', true);

	//Prettify HTML
	app.locals.pretty = true;

	//Should be placed before express.static
	app.use(stylus.middleware({
		src: config.root + '/public',
		compile: function compile(str, path) {
	  	return stylus(str)
		  .set('filename', path)
		  .set('compress', true)
		}
	}));

	app.use(express.compress({
		filter: function(req, res) {
			return (/json|text|javascript|css/).test(res.getHeader('Content-Type'));
		},
		level: 9
	}));

	//Don't use logger for test env
	if (process.env.NODE_ENV !== 'test') {
		app.use(express.logger('dev'));
	}

	//Set views path, template engine and default layout
	app.set('views', config.root + '/app/views');
	app.set('view engine', 'jade');

	//Enable jsonp
	app.enable("jsonp callback");

	app.configure(function() {
		//cookieParser should be above session
		app.use(express.cookieParser());

		// request body parsing middleware should be above methodOverride
		app.use(express.urlencoded());
		app.use(express.json());
		app.use(express.methodOverride());

		//express/mongo session storage
		app.use(express.session({
			secret: 'MEAN',
			store: new mongoStore({
				db: db.connection.db,
				collection: 'sessions'
			})
		}));

		//connect flash for flash messages
		app.use(flash());

		//dynamic helpers
		app.use(helpers(config.app.name));

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

		//routes should be at the last
		app.use(app.router);
		
		//Setting the fav icon and static folder
		app.use(express.favicon());
		app.use(express.static(config.root + '/public'));

		//Assume "not found" in the error msgs is a 404. this is somewhat silly, but valid, you can do whatever you like, set properties, use instanceof etc.
		app.use(function(err, req, res, next) {
			//Treat as 404
			if (~err.message.indexOf('not found')) return next();

			//Log it
			console.error(err.stack);

			//Error page
			res.status(500).render('500', {
				error: err.stack
			});
		});

		//Assume 404 since no middleware responded
		app.use(function(req, res, next) {
			res.status(404).render('404', {
				url: req.originalUrl,
				error: 'Not found'
			});
		});
	});
};