geowhycdn_plugin.php

<?php
if ($_SERVER["GEOWHY_CDN_ENABLED"] != "1")
{
	return;
}

require_once dirname(__FILE__)."/global.php";
require_once dirname(__FILE__)."/plugin.php";

$geowhycdn = new Geowhy_CDN();

class Geowhy_CDN
{
	private $gscripts = null;
	private $wp_upload_url_path = null;
	private $uploads_use_yearmonth_folders = null;
    private $base_url = null;
	private $domain = null;
	private $dbfile = null;
	private $dbhandle = null;
	private $redirect_domains = null;
	private $cdn_domains = null;

	function __construct() {

		$this->gscripts = array(
			'dojo' => 'dojo.xd',
			'jquery' => 'jquery.min',
			'mootools' => 'mootools-yui-compressed',
			'prototype' => 'prototype'
		);

		global $g_redirect_domains, $g_cdn_domains;
		$this->redirect_domains = $g_redirect_domains;
		$this->cdn_domains = $g_cdn_domains;

		$this->domain = $_SERVER["SERVER_NAME"];

		$wp_upload_dir = wp_upload_dir();
		$this->wp_upload_url_path = $wp_upload_dir['baseurl'];

        if (!$guessurl = site_url())
            $guessurl = wp_guess_url();
        $this->base_url = $guessurl;

		$this->dbfile = $_SERVER["STATIC_MAP_FILENAME"];
		$this->dbhandle = $this->open_db($this->dbfile);

		if (is_resource($this->dbhandle))
		{
			$this->bind_actions();
			$this->bind_filters();
		}
	}

	private function bind_actions() {
        $this->add_action("wp_default_scripts", "rewrite_wp_default_scripts", 900);
	}

	private function bind_filters() {
        $this->add_filter("the_content", "media_url_rewrite", 1000);
        $this->add_filter("stylesheet_uri", "filter_url", 100);
	}

    function add_hook($type, $name, $callable, $priority)
    {
        global $g_plugin_exceptions;
        if (isset($g_plugin_exceptions[$type][$this->domain][$name]))
        {
              return;
        }
        else
        {
            $method = "add_".$type;
            $method($name, array($this, $callable), $priority);
        }
    }

    function add_filter($name, $callable, $priority)
    {
        $this->add_hook("filter", $name, $callable, $priority);
    }

    function add_action($name, $callable, $priority)
    {
        $this->add_hook("action", $name, $callable, $priority);
    }

	function filter_url($url)
	{
		return $this->replace_url($url);
	}

	function filter_js($url)
	{
		return $this->replace_url($url);
	}

	function filter_css($url)
	{
		return $this->replace_url($url);
	}

	function filter_theme($url)
	{
		if (preg_match("/^http[s]?:\/\/[^\/]+(\/.*)$/", $url, $matches))
		{
			$url = $matches[1];
		}
		return "http://static.geowhy.org/".$this->domain.$url;
	}

	function media_url_rewrite($data) {
		$file_upload_url = $this->wp_upload_url_path.'/';
		$file_upload_url = str_replace('/','\/',str_replace('//','//(www.)?(',$file_upload_url));
		preg_match_all('/'.$file_upload_url.'[^"\']+)/',$data,$matches);
		$patterns = array();
		$replacements = array();
		foreach($matches[0] as $urls) {
			$replacements[] = $this->replace_url($urls);
			$patterns[] = '/'.str_replace('/','\/',$urls).'/';
		}
		$data = preg_replace($patterns,$replacements,$data);
		return $data;
	}

	function rewrite_wp_default_styles(&$wp_styles) {
		foreach ($wp_styles->registered as $styleobj) {
			$styleobj->src = $this->replace_url($this->base_url.$styleobj->src);
		}
	}

	function rewrite_wp_default_scripts(&$wp_scripts) {
		foreach($wp_scripts->registered as $scriptobj) {
			/*if (array_key_exists($scriptobj->handle, $this->gscripts))
			{
				$libname = $scriptobj->handle;
				$jsname = $this->gscripts[$libname];
				$ver = $scriptobj->ver;
				$transport = (is_ssl()) ? "https:" : "http"; //make it ssl if the site is ssl.
				$scriptobj->src = "$transport://ajax.googleapis.com/ajax/libs/$libname/$ver/$jsname.js";
			}
			else
			{*/
			$scriptobj->src = $this->replace_url($this->base_url.$scriptobj->src);
			/*}*/
		}
	}

	function open_db($dbfile)
	{
		return dba_open($dbfile, "r", "db4");
	}

	function get_redirect_url($path)
	{
		$domain = $this->redirect_domains[str2int($path) % count($this->redirect_domains)];
		return "http://".$domain."/".$path;
	}

	function get_cdn_url($path)
	{
		$domain = $this->cdn_domains[str2int($path) % count($this->cdn_domains)];
		return "http://".$domain."/".$path;
	}

	function replace_url($url)
	{
		$pathinfo = pathinfo($url);
		if (in_array($pathinfo["extension"], array("mp3", "wma", "mp4", "wav")))
		{
			return $url;
		}
		if (preg_match("/^(http[s]?:\/\/)([^\/]+\/.*)$/", $url, $matches))
		{
			$url = $matches[2];
		}
		else
		{
			$url = $this->domain."/".trim($url, "/");
		}
		$urlinfo = parse_url($url);
		$url = $urlinfo["path"];
		$url = trim($url);
		$url = trim($url, "/");
		$value = $this->is_url_loaded($url);
		if (! empty($value))
		{
			return $this->get_cdn_url($value);
		}
		else
		{
			return $this->get_redirect_url($url);
		}
	}

	function is_url_loaded($url)
	{
		$key = str_replace("/", "_", $url);
		return dba_fetch($key, $this->dbhandle);
	}
}

?>