Node.js Express Serve static files only with SIMPLE authentification - node.js

Question

I've a problem since two days ago now.
I just want an authentification on my static files.
I look at a lot of post on the internet and nothing answer my question simply.
I try to use basic-auth, but it has no effect on my webpages.
I just want a simple dialog box before open my static pages that ask name and password and in my server.js just a thing like : if name == 'foo' and password =='pwd' then "send my static content".
But it seems to be not simple as it might be.
There is my code :
/***************************************************************************/
//Server Node.js
/** ************************************************************************ */
var express = require("express");
var app = express();
var bodyParser = require("body-parser");
// Routers
var router = express.Router();
var mongoose = require("mongoose");
mongoose.connect('mongodb://localhost:27017/mydb');
var conn = mongoose.connection;
var assert = require("assert");
var basicAuth = require('basic-auth');
var auth = function (req, res, next) {
function unauthorized(res) {
res.set('WWW-Authenticate', 'Basic realm=Authorization Required');
return res.send(401);
};
var user = basicAuth(req);
if (!user || !user.name || !user.pass) {
return unauthorized(res);
};
if (user.name === 'foo' && user.pass === 'bar') {
return next();
} else {
return unauthorized(res);
};
};
app.use('/', auth);
app.use(express.static('public'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({"extended" : false}));
router.route("/data").get(function(req, res) {
// A non static route
});
}).post(function(req, res) {
// A non static route
});
router.route("/data/:id?").get(function(req, res) {
// A non static route
});
router.route("/remove/:id?").get(function(req, res) {
// A non static route
});
app.use('/', router);
app.listen(8080);
console.log("Listening to PORT 8080");
Thanks.
Have a nice day.