server.js

/* Module dependecies */
var connect = require("connect"),
      users = require("./users"), /* User authentication list provided by users.json */
      RedisStore = require("connect-redis")(connect); /* Mantains the user session although the active service shutdown */
var server = connect(
    connect.logger("dev"),
    connect.bodyParser(),
    connect.cookieParser(),
    connect.session({ store: new RedisStore, secret: "my app secret" }),
    function (req, res, next) {
        if ("/" == req.url && req.session.logged_in) {
            res.writeHead(200, {  "Content-Type": "text/html" });
            res.end(
                "Welcome back, <b>" + req.session.name + "</b>. "
                + "<a href='/logout'>Logout</a>"
            );
        } else {
            next();
        }
    }, function (req, res, next) {
        if ("/" == req.url && "GET" == req.method) {
            res.writeHead(200, { "Content-Type": "text/html" });
            res.end([
                "<form action='/login' method='POST'>",
                " <fieldset>",
                "   <legend>Please log in</legend>",
                "   <p>User: <input type='text' name='user'></p>",
                "   <p>Password: <input type='password' name='password'></p>",
                "   <button>Submit</button>",
                " </fieldset>",
                "</form>"
            ].join(""));
        } else {
            next();
        }
    }, function (req, res, next) {
        if ("/login" == req.url && "POST" == req.method) {
            res.writeHead(200);
            if (!users[req.body.user] || req.body.password != users[req.body.user].password) {
                console.log("Bad user name");
            } else {
                req.session.logged_in = true;
                req.session.name = users[req.body.user].name;
                res.end("Authenticated!");
            }
        } else {
            next();
        }      
    }, function (req, res, next) {
        if ("/logout" == req.url) {
            req.session.logged_in = false;
            res.writeHead(200);
            res.end("Logged out");
        } else {
            next();
        }
    }
);
/* Listen */
server.listen(3000);