web.js

// Horrible web server from
// http://thecodinghumanist.com/blog/archives/2011/5/6/serving-static-files-from-node-js
var http = require('http');
var fs = require('fs');
var path = require('path');
var sfxr = require('./sfxr');

var port = process.env.PORT || 3000;

var cache = {};

http.createServer(function (request, response) {
                    
  var filePath = '.' + request.url;
  if (filePath == './')
    filePath = './index.html';
  
  var DYNO = "./sfx.wav?";

  if (filePath.indexOf(DYNO) == 0) {
    var query = filePath.substring(DYNO.length);
    query = require("querystring").parse(query);
    var params = new sfxr.Params();
    for (var k in query)
      if (query.hasOwnProperty(k))
        params[k] = query[k];
    var sfx = sfxr.generate(params);
    response.writeHead(200, { 
      'Content-Type': 'audio/wav',
      'Content-Length': sfx.wav.length
    });
    response.end(new Buffer(sfx.wav), 'binary');
    return;
  }

  var extname = path.extname(filePath);
  var contentType = 'text/html';
  switch (extname) {
  case '.js':
    contentType = 'text/javascript';
    break;
  case '.css':
    contentType = 'text/css';
    break;
  case '.png':
    contentType = 'image/png';
    break;
  }

  if (cache.hasOwnProperty(filePath)) {
    response.writeHead(200, { 'Content-Type': contentType });
    response.end(cache[filePath], 'utf-8');
    return;
  }
  
  path.exists(filePath, function(exists) {
    
    if (exists) {
      fs.readFile(filePath, function(error, content) {
        if (error) {
          response.writeHead(500);
          response.end('500 Server error');
        }
        else {
          cache[filePath] = content;
          response.writeHead(200, { 'Content-Type': contentType });
          response.end(content, 'utf-8');
        }
      });
    } else {
      response.writeHead(404);
      response.end('404 File not found');
    }
  });
  
}).listen(port, function() {
  console.log("Listening on " + port);
});