initial merge of cdn rewrite plugin

cloudfiles-cdn.php

@@ -363,3 +363,136 @@ class CloudfilesCdn {
 
 require_once('voce-settings.php');
 $cdn = new CloudfilesCdn();
+
+class CDN_Rewrite {
+
+	private $file_extensions;
+	private $blog_details;
+	private $cdn_root_url;
+
+	public function __construct() {
+		$this->file_extensions = 'bmp|bz2|css|gif|ico|gz|jpg|jpeg|js|mp3|pdf|png|rar|rtf|swf|tar|tgz|txt|wav|zip';
+		$this->cdn_root_url = trailingslashit(CloudfilesCdn::get_setting('root_url'));
+	}
+
+	/**
+	 * Initializes class and registers hooks
+	 *
+	 */
+	public function initialize() {
+		if(!empty($this->cdn_root_url)) {
+			add_action('template_redirect', array($this, 'start_buffer'), 1);
+		}
+	}
+
+	/**
+	 * start output buffering.
+	 *
+	 */
+	public function start_buffer() {
+		ob_start(array($this, 'filter_urls'));
+	}
+
+	/**
+	 * Callback for output buffering.  Search content for urls to replace
+	 *
+	 * @param string $content
+	 * @return string
+	 */
+	public function filter_urls($content) {
+		$root_url = $this->get_site_root_url();
+		$regex = '#(?<=[(\"\'])'.quotemeta($root_url).'(?:(/[^\"\')]+\.('.$this->file_extensions.')))#';
+
+		$content = preg_replace_callback($regex, array($this, 'url_rewrite'), $content);
+
+		return $content;
+	}
+
+	/**
+	 * Returns the root url of the current site
+	 *
+	 * @return string
+	 */
+	public function get_site_root_url() {
+		if(is_multisite() && !is_subdomain_install()) {
+			$root_blog = get_blog_details(1);
+			$root_url = $root_blog->siteurl;
+		} else {
+			$root_url = site_url();
+		}
+		return $root_url;
+	}
+
+	/**
+	 * Returns the details for the current blog
+	 *
+	 * @return object
+	 */
+	public function get_this_blog_details() {
+		if(!isset($this->blog_details)) {
+			global $blog_id;
+			$this->blog_details = get_blog_details($blog_id);
+		}
+		return $this->blog_details;
+	}
+
+	/**
+	 * Callback for url preg_replace_callback.  Returns corrected URL
+	 *
+	 * @param array $match
+	 * @return string
+	 */
+	public function url_rewrite($match) {
+		global $blog_id;
+		$path = $match[1];
+		//if is subfolder install and isn't root blog and path starts with site_url and isnt uploads dir
+		if(is_multisite() && !is_subdomain_install() && $blog_id !== 1) {
+			$bloginfo = $this->get_this_blog_details();
+			if((0 === strpos($path, $bloginfo->path)) && (0 !== strpos($path, $bloginfo->path.'files/'))) {
+				$path = '/'.substr($path, strlen($bloginfo->path));
+			}
+		}
+		return $this->cdn_root_url . $path;
+	}
+}
+add_action('init', array(new CDN_Rewrite(), 'initialize'));
+
+class CDN_VersionAssets {
+
+	private $default_version = '';
+	private $root_url;
+
+	public function __construct() {
+		$this->root_url = site_url();
+	}
+
+	public function initialize() {
+		add_filter('style_loader_src', array($this, 'replace_version'), 10);
+		add_filter('script_loader_src', array($this, 'replace_version'), 10);
+		add_filter('style_loader_src', array($this, 'replace_version'), 10);
+	}
+
+	public function on_template_redirect() {
+		$this->default_version = @filemtime(get_stylesheet_directory().'/style.css');
+	}
+
+	private function get_version($url) {
+		if(0 === strpos($url, $this->root_url)) {
+			$parts = parse_url($url);
+			$file_path = str_replace(site_url('/'), ABSPATH, $parts['scheme'].'://'.$parts['host'].$parts['path']);
+			if(	!($version = @filemtime($file_path)) ) {
+				$version = $this->default_version;
+			}
+			return $version;
+		}
+		return false;
+	}
+
+	public function replace_version($src) {
+		if( $new_version = $this->get_version($src) ) {
+			return add_query_arg('ver', $new_version, $src);
+		}
+		return $src;
+	}
+}
+add_action('init', array(new CDN_VersionAssets(), 'initialize'));
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