Express router chaining, REST API user adding, nodejs

router.js

const router = require('express').Router();
const User = require('./lib/user');

router.post('/api/users', 
 User.validateUser, 
 User.addUser, 
 User.sendValidationEmail,
 User.authenticateUser,
 function(req, res, next) {
 res.status(204).end();
 }
); 

lib/user.js

const co = require('co');
const q = require('q');
const passport = require('passport');

/* your own implementations come here */
const userMongooseModel = require('./db/userMongooseModel');
const email = require('./lib/email');

const validateUser = function(req, res, next) {
 co(function*() {

 if (!req.body.email) {
 return next(new Error('E-mail required'));
 }

 delete req.body.forbiddenkey;

 next();

 }).catch(function(error) {
 next(error);
 });
}

const addUser = function(req, res, next) {
 co(function*() {

 let user = yield userMongooseModel.create(req.body);

 // if your mongoose schema creates it, for the validation
 req.body.token = user.token;

 next();

 }).catch(function(error) {
 next(error);
 });
}

const sendValidationEmail = function(req, res, next) {
 co(function*() {

 yield email.sendActivationEmail(req.body.email, req.body.name, req.body.token);

 next();

 }).catch(function(error) {
 next(error);
 });
}

const authenticateUser = function(req, res, next) {

 passport.authenticate('local')(req, res, function () {
 req.session.save(function (error) {
 if (error) {
 return next(err);
 }
 next();
 });
 }); 

}

module.exports = {
 validateUser: validateUser,
 addUser: addUser,
 sendValidationEmail: sendValidationEmail,
 authenticateUser: authenticateUser
}

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