server.js

// Dependencies
// ============
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser'); // for working with cookies
var bodyParser = require('body-parser');
var session = require('express-session'); 
var methodOverride = require('method-override'); // for deletes in express
var mongoose = require('mongoose');
// Express settings
// ================

// instantiate our app
var app = express();
var server = require('http').Server(app);
var io = require('socket.io')(server);

// override POST to have DELETE and PUT
app.use(methodOverride('_method'))

//allow sessions
app.use(session(
	{ 
		secret: 'app', 
		cookie: { maxAge: null },
		resave: true,
    saveUninitialized: true
	}
));

app.use(function(req, res, next){
  res.io = io;
  next();
});

app.use(cookieParser());

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

//set up handlebars
var exphbs = require('express-handlebars');
app.engine('handlebars', exphbs({
    defaultLayout: 'main'
}));
app.set('view engine', 'handlebars');

// uncomment after placing your favicon in /public
//app.use(favicon(__dirname + '/public/favicon.ico'));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));


require('./routes')(app);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});


// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: err
    });
  });
}
// error handler
// no stacktraces leaked to user unless in development environment
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  res.render('error', {
    message: err.message,
    error: (app.get('env') === 'development') ? err : {}
  })
});



// our module get's exported as app.
module.exports = {app: app, server: server};


// Where's the listen? Open up bin/www, and read the comments.