dev_server.js

/*
 * Fork & Refactor of https://gist.github.com/246761
 *  -> Credit: Noah Sloan <http://noahsloan.com>
 */

/**
 * Simple webserver with logging. Serves whatever files are reachable from
 * the directory where node is running. Supports Windows port of node.
 */
var fs = require('fs'),
    path = require('path'),
    sys = require('util');

var DEBUG = 0, INFO = 1, WARN = 2, ERROR = 3;
var LOG_LEVEL = DEBUG;

var PORT = 8080;

require("http").createServer(function( req, resp) {
    // don't allow ../ in paths
    var file = '.' + req.url;
    if (file.substr(-1) === '/'){
        file += 'index.html';
    }
    var ext = path.extname(file);
    var contentType;

    log(ERROR,ext);
    switch(ext) {
    case '.htm':
        contentType = 'text/html';
        break;
    case '.html':
        contentType = 'text/html';
        break;
    case '.js':
        contentType = 'text/javascript';
        break;
    case '.css':
        contentType = 'text/css';
        break;
    case '.png':
        contentType = 'image/png';
        break;
    case '.jpeg':
        contentType = 'image/jpeg';
        break;
    case '.jpg':
        contentType = 'image/jpeg';
        break;
    case '.gif':
        contentType = 'image/gif';
        break;
    case '.ico':
        contentType = 'image/gif';
        break;
    default:
        contentType = 'text/plain';
        break;
    }
    log(DEBUG,"Got request for",file,contentType);
    streamFile( file, resp, contentType, req);

}).listen(PORT);

log(INFO,"Server running on port",PORT);

function streamDirectory( directory, resp, contentType, req ){

    //Remove index.html appended earlier
    directory = directory.replace( /index\.html/, '' )
        .replace( '//', '/' );

    fs.readdir( directory, function( err, files ){
        if( !err ){

            if( ! /\/$/.test( directory ) ){

                resp.writeHead( 301, { 'Location': req.url + '/',
                                       Expires: (new Date).toGMTString()
                                     });
                resp.end();
                return;
            }

            files = files.filter( function( n ){
                //Filter hidden and emacs files
                return !/^\.|~$/.test( n );
            }).sort(function( a, b ){

                if( a === b ){
                    return 0;
                } else if(
                    a.toLowerCase().split('.')[0] >
                        b.toLowerCase().split('.')[0] ){

                            return 1;
                        } else {
                            return -1;
                        }
            }).map(function( n ){

                return '<a href="' +
                    n/*.replace( /^\./, "" )*/ + '">' +
                    n/*.replace( /.+\//, '' )*/ + '</a><br/>';
            });

            resp.writeHead( 200, { 'Content-Type': 'text/html' });
            files.unshift( '<a href="../">Up one directory</a><br/>' );

            resp.end( files.join('\n'), 'utf-8' );
        } else {
            resp.writeHead(404);
            resp.end();
        }
    });


}

function streamFile(file,resp,contentType) {

    var args = arguments;

    path.exists(file, function(exists) {
        if (exists) {

            fs.readFile(file, function(err,data) {

                if (err) {
                    streamDirectory.apply( null, args );
                    // resp.writeHead(500);
                    // resp.end();
                    // log(WARN, "No such file: ", file);
                } else {
                    resp.writeHead(200, { 'Content-Type': contentType });
                    resp.end(data, 'utf-8');
                }
            });
        } else {

            streamDirectory.apply( null, args );
        }
    });
}

/* Logging/Utility Functions */
function log(level) {
    if(level >= LOG_LEVEL) sys.puts(join(slice(arguments,1)));
}
function slice(array,start) {
    return Array.prototype.slice.call(array,start);
}
function isString(s) {
    return typeof s === "string" || s instanceof String;
}
function flatten(array) {
    var result = [], i, len = array && array.length;
    if(len && !isString(array)) {
        for(i = 0; i < len; i++) {
            result = result.concat(flatten(array[i]));
        }
    } else if(len !== 0) {
        result.push(array);
    }
    return result;
}
function join() {
    return flatten(slice(arguments,0)).join(" ");
}