How to check authentication on incoming request

authen_route

var _   = require('underscore');
var authenController	= require('../controllers/authentication');
var config	= require('../configs/config');
var constant = require('../configs/constant');
module.exports = {
	authen:function(req, res, next){
		var domain = req.customdomain;
		var token = req.header("token");
		if(!domain || !token){
			res.send(401,{message:req.i18n.t("app.unauthentication")});
		}
		authenController.authen(domain,token,req.originalUrl).then(function(session){
			//config.writeLog('authen pass');
			//config.writeLog(session);
			req.session=session;
			req.accessType={};
			if(!_.isEmpty(session)){
				
				req.accessType.system 		= 	_.indexOf(session.roles, constant.ROLES.SystemAdministration)>=0;
				req.accessType.app 			= 	_.indexOf(session.roles, constant.ROLES.AppAdministration)>=0;
				req.accessType.secretary 	= 	_.indexOf(session.roles, constant.ROLES.AppSecretary)>=0;
			}
		  	
			next();
		}).catch(function(err){
			res.send(401,err);
		})  		
	}
}