passport.js

'use strict';

/**
 * Module dependencies.
 */
var passport = require('passport'),
	User = require('mongoose').model('User'),
	path = require('path'),
    LocalStrategy = require('passport-local').Strategy
/**
 * Module init function.
 */
module.exports = function() {
	// Serialize sessions
	passport.serializeUser(function(user, done) {
		done(null, user.id);
	});

	// Deserialize sessions
	passport.deserializeUser(function(id, done) {
		User.findOne({
			_id: id
		}, '-salt -password', function(err, user) {
			done(err, user);
		});
	});

    passport.use(new LocalStrategy({
        usernameField: 'username',
        passwordField: 'password'
    },
    function(username, password, done) {
        User.findOne({
            username: username
        }, function(err, user) {
            if (err) {
                return done(err);
            }
            if (!user) {
                return done(null, false, {
                    message: 'Unknown user or invalid password'
                });
            }
            if (!user.authenticate(password)) {
                return done(null, false, {
                    message: 'Unknown user or invalid password'
                });
            }

            return done(null, user);
        });
    }
	));
};