app.js

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var lessMiddleware = require('less-middleware');
var clientSession = require('./models/clientSessionSchema');

/*
//importing my module
var myModules= require('./includes/essencial_functions_module');
//instaniating my essential function
var MyFunctions = new myModules();
*/
var index = require('./routes/index');
// var users = require('./routes/users');

var app = express();

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



// uncomment after placing your favicon in /public
// app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: false}));
app.use(cookieParser());
app.use(lessMiddleware(path.join(__dirname, 'public')));
app.use(express.static(path.join(__dirname, 'public')));
app.use(function(req, res, next) {
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader('Access-Control-Allow-Headers', 'Content-Type');

  next();
});


// middleware for session validation
app.use(
    ['/api/getStates', '/api/setStates', '/api/addDevice', '/api/refreshUser'],
    function(req, res, next) {
      var sessionId = req.body.sessionId;
      if (req.body.sessionId) {
        clientSession.findOne()
            .where({sessionId: sessionId})
            .then(function(doc) {
              if (doc.expiry >= Date.now()) {
                next();
              } else {
                res.json({
                  message: 'session expire please Re-loggin!',
                  loggedIn: false
                });
              }
            })
            .catch(function(err) { res.send(err); });

      } else {
        res.send({errFlag: 1, message: 'sessionId is required'});
      }

    });

/*
// Json validator middle-ware
var Validate_JSON = function(req, res, next) {
  // JSON_validator from my custom module
  MyFunctions.JSON_validator(req, res);
  next();
};

// adding the validator middleware to the app
app.use(Validate_JSON);
*/
app.use('/', index);
// app.use('/users', users);

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

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;