jqueryFileTree Connector Script in Node.js

/* This node script listens for POST requests on /, interprets the 'dir'
 *  variable as a path to list and returns the unordered list format
 * expected by jqueryFileTree
 * http://www.abeautifulsite.net/blog/2008/03/jquery-file-tree/
 *
 * It also serves  pages out of the _static directory contained in
 * the current directory. Place your example html in there.
 */
var connect = require('connect'),
    util = require('util'),
    fs = require('fs');


var stringHeader = "<ul class='jqueryFileTree' style='display: none;'>";
var stringFooter = "</ul>";
// arguments: path, directory name
var formatDirectory =
    "<li class='directory collapsed'><a href='#' rel='%s/'>%s</a><li>";
// arguments: extension, path, filename
var formatFile = "<li class='file ext_%s'><a href='#' rel='%s'>%s</a></li>";

var createStatCallback = (function(res, path, fileName, isLast){
    return function(err, stats){

        if(stats.isDirectory())
        {
            res.write(util.format(formatDirectory, path, fileName));
        }
        else
        {
            var fileExt = fileName.slice(fileName.lastIndexOf('.')+1);

            res.write(util.format(formatFile, fileExt, path, fileName));
        }

        if(isLast){
             res.end(stringFooter);
        }
    }
});

var handlePost = function(req, res){

    // 'text/html'
    res.writeHead(200, {'content-type': 'text/plain'});
    res.write(stringHeader);

    // get a list of files
    fs.readdir(req.body.dir, function(err, files){

        for(var i = 0; i < files.length; i++)
        {
            var fileName = files[i];
            var path = util.format('%s%s', req.body.dir, fileName);
            var isLast = (i === (files.length-1));


            var statCallback = createStatCallback(res, path, fileName, isLast);

            fs.stat(path, statCallback);
        }

    });
};

var server = connect()
        .use(connect.logger())
        .use(connect.static(__dirname + '/_static'))
        .use(connect.bodyParser())
        .use(connect.router(function(app){
            app.post('/', handlePost);
            }));

server.listen(8080);
console.log('Server running at http://127.0.0.1:8080');