Node based simple Http Server for serviing static files.

Node Http File Server

#!/usr/bin/env node

var path = require('path');
var fs = require('fs');
var optimist = require('optimist');
var argv = optimist.usage('$0 --dir [base_directory] --port [port]')
    .default({ dir: '.', port: 8080 })
    .argv;

if (argv.help) {
    optimist.showHelp(console.log);
    return;
}

// creates the options from the command line arguments
var options = {
    port: Number(argv.port),
    dir: argv.dir,
};

require('http').createServer(function (req, res) {

    // defines error handler
    function handleError(err) {

        console.log(err);
        res.writeHead(500);
        res.end('Internal Server Error');
    }

    console.log('Received request for file', req.url);
    var file = path.normalize(options.dir + req.url);

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

        if (exists) {

            // checks if file is directory
            fs.stat(file, function (err, stat) {
                var fileStream;

                if (err) {
                    handleError(err);
                }

                if (stat.isDirectory()) {
                    // does not allow directory listening
                    console.log('File is a directory', file);
                    res.writeHead(403);
                    res.end('Forbidden');
                } else {
                    console.log('Coping the file', file);

                    fileStream = fs.createReadStream(file);
                    fileStream.on('error', handleError);

                    // writes the file to the output
                    fileStream.pipe(res);
                }
            });
        } else {
            // the file does not exists
            console.log('File does not exists', file);
            res.writeHead(404);
            res.end('Not found');
        }
    });
}).listen(options.port);

console.log('Server up and running on port', options.port);