Media Controller for my lovely Media system

media.php

<?php defined('SYSPATH') or die('No direct script access.');
/**
 * Handles all media the website will ever have to need. It minifies all
 * javascript and stylesheets. Then it compresses every file to gzip and outputs
 * it to the browser, if he accepts it.
 *
 * @package    OpenTorrent
 * @category   Controllers
 * @author Birkir R Gudjonsson <birkir.gudjonsson@gmail.com>
 * @copyright Copyright (c) 2010, Birkir R Gudjonsson
 */
class Controller_Media extends Controller {

	// Add cache headers to client
	private $cache = TRUE;

	// Directory to keep media
	protected $_directory = 'media/';

	/**
	 * 
	 */
	public function action_index()
	{
		$this->request->response = '404 File not found';
	}

	/**
	 * 
	 * @param string $file Filename
	 */
	public function action_img($file = NULL)
	{
		$file = APPPATH.$this->_directory.$this->request->action.'/'.$file;
		$this->passthru($file);
	}

	public function action_css($file = NULL)
	{
		$file = APPPATH.$this->_directory.$this->request->action.'/'.$file;
		$file = $this->minify($file, 'css');
		$file = $this->gzip($file);
		$this->passthru($file, true);
	}

	public function action_js($file = NULL)
	{
		$file = APPPATH.$this->_directory.$this->request->action.'/'.$file;

		if (substr($file,-7) == '.min.js')
		{
			$file = $this->gzip($file);
			$this->passthru($file, true);
			return false;
		}

		$file = $this->minify($file, 'js');
		$file = $this->gzip($file);
		$this->passthru($file, true);
	}

	public function minify($file = NULL, $type = 'css')
	{
		if ( ! is_file($file))
		{
			throw new Kohana_Exception('File does not exist');
		}

		$this->minified = APPPATH.'cache/minify/'.md5_file($file);

		$file_content = file_get_contents($file);

		$min_content = Minify::factory($type)->set($file_content)->min();

		$fh = fopen($this->minified, 'w+');
		fwrite($fh, $min_content);
		fclose($fh);

		return $this->minified;
	}

	public function passthru($file = NULL, $gzip = FALSE)
	{
		if ( ! is_file($file))
		{
			throw new Kohana_Exception('File does not exist');
		}

		$headers = array();

		if ($this->request->accept_encoding('gzip') AND $gzip == TRUE)
		{
			$headers['Content-Encoding'] = 'gzip';
		}

		$headers['Content-Type'] = File::mime_by_ext($file);
		$headers['Content-length'] = filesize($file);
		$headers['Last-Modified']  = date('r', filemtime($file));

		if ($this->cache == TRUE)
		{
			$headers['Cache-Control'] = 'must-revalidate';
			$headers['Expires'] = gmdate("D, d M Y H:i:s", time() + (86400 * 3)).' GMT';
		}

		$this->request->headers += $headers;
		$this->request->send_headers();

		$image = @fopen($file, 'rb');
		if ($image)
		{
			fpassthru($image);
			exit;
		}
	}

	/**
	 * GZip the file and return cached version
	 *
	 * @param   string   File path
	 * @return  string   Cached version
	 */
	public function gzip($file = NULL)
	{
		$this->cached = APPPATH.'cache/media/'.md5_file($file);

		if ( ! is_file($file))
		{
			throw new Kohana_Exception('File does not exist');
		}

		$fh = fopen($this->cached, 'w+');
		fwrite($fh, gzencode(file_get_contents($file)));
		fclose($fh);

		return $this->cached;
	}

} // End Controller_Media