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<?php |
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|
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; |
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} |
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|
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class Powered_Cache_CDN { |
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|
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/** |
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* Return an instance of the current class |
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* |
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* @since 1.0 |
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* @return Powered_Cache_CDN |
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*/ |
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public static function factory() { |
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static $instance = false; |
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|
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if ( ! $instance ) { |
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$instance = new self(); |
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$instance->setup(); |
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} |
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|
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return $instance; |
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} |
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|
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/** |
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* Setup hooks |
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* |
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* @since 1.0 |
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*/ |
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public function setup() { |
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|
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add_filter( 'wp_get_attachment_url', array( $this, 'cdn_url' ), 9999 ); |
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add_filter( 'stylesheet_uri', array( $this, 'cdn_url' ), 9999 ); |
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add_filter( 'smilies_src', array( $this, 'cdn_url' ), 9999 ); |
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add_filter( 'bp_core_fetch_avatar_url', array( $this, 'cdn_url' ), 9999 ); |
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add_filter( 'style_loader_src', array( $this, 'cdn_url' ), 9999 ); |
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add_filter( 'script_loader_src', array( $this, 'cdn_url' ), 9999 ); |
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|
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|
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add_filter( 'the_content', array( $this, 'cdn_images' ), 9999 ); |
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add_filter( 'post_thumbnail_html', array( $this, 'cdn_images' ), 9999 ); |
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add_filter( 'get_avatar', array( $this, 'cdn_images' ), 9999 ); |
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add_filter( 'bp_core_fetch_avatar', array( $this, 'cdn_images' ), 9999 ); |
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add_filter( 'widget_text', array( $this, 'cdn_images' ), 9999 ); |
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|
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|
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do_action( 'powered_cache_cdn_setup' ); |
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} |
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|
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|
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public function cdn_url( $url ) { |
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if ( is_admin() || is_preview() ) { |
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return $url; |
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} |
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|
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return $this->maybe_cdn_replace( $url ); |
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} |
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|
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|
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|
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public function cdn_images( $content ) { |
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if ( is_admin() || is_preview() || empty( $content ) ) { |
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return $content; |
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} |
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|
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if ( ! class_exists( 'DOMDocument' ) ) { |
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return $content; |
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} |
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|
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$document = new DOMDocument(); |
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@$document->loadHTML($content); |
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$images = $document->getElementsByTagName('img'); |
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|
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$img_url = array(); |
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foreach ( $images as $img ) { |
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if ( $img->hasAttribute( 'src' ) ) { |
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$img_url[] = $img->getAttribute( 'src' ); |
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} |
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|
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if ( $img->hasAttribute( 'srcset' ) ) { |
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$imgset = explode( ',', $img->getAttribute( 'srcset' ) ); |
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foreach ( $imgset as $src_item ) { |
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$imgsrc = explode( ' ', trim( $src_item ) ); |
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// first item is url, second width |
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$img_url[] = $imgsrc[0]; |
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} |
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} |
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} |
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|
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$img_url = array_unique($img_url); |
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$cdn_url = array(); |
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|
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foreach ( $img_url as $replace_url ) { |
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$cdn_url[] = $this->maybe_cdn_replace( $replace_url ); |
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} |
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|
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|
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return str_replace($img_url,$cdn_url,$content); |
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} |
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|
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|
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/** |
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* this method decide to url replacement. |
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* rejected files & external resources will be ignored |
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* |
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* @since 1.0 |
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* |
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* @param string $url |
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* @return string cdn url |
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*/ |
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public static function maybe_cdn_replace( $url ) { |
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global $powered_cache_options; |
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|
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$raw_url = $url; |
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|
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// rejected file |
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if ( ! empty( $powered_cache_options['cdn_rejected_files'] ) ) { |
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$cdn_rejected_files = preg_split( '#(\r\n|\r|\n)#', $powered_cache_options['cdn_rejected_files'] ); |
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$cdn_rejected_files = implode( '|', $cdn_rejected_files ); |
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|
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if ( preg_match( '#(' . $cdn_rejected_files . ')#', $url ) ) { |
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return $url; |
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} |
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} |
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|
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// external resource |
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if ( false === strpos( $url, site_url() ) ) { |
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return $url; |
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} |
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|
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// clean version string |
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if ( strpos( $url, '?ver=' ) ) { |
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$raw_url = remove_query_arg( 'ver', $url ); |
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} |
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|
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$raw_url = untrailingslashit( $raw_url ); |
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$ext = explode( '.', $raw_url ); |
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$ext = strtolower( end( $ext ) ); |
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|
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$zone = 'all'; |
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$image_extensions = apply_filters( 'powered_cache_cdn_image_extensions', array( 'jpg', 'jpeg', 'gif', 'png', 'bmp', 'ico' ) ); |
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|
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if ( in_array( $ext, $image_extensions ) ) { |
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$zone = 'image'; |
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} elseif ( 'css' == $ext ) { |
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$zone = 'css'; |
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} elseif ( 'js' == $ext ) { |
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$zone = 'js'; |
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} |
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|
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$cdn_url = self::get_best_possible_cdn_host( $zone ); |
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|
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// no host found |
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if ( false === $cdn_url ) { |
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return $url; |
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} |
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|
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return str_replace( site_url(), $cdn_url, $url ); |
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} |
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|
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/** |
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* try to catch best cdn address to given zone |
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* @param string $zone keys of Powered_Cache_Admin_Helper::cdn_zones |
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* |
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* @return mixed string | false |
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*/ |
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public static function get_best_possible_cdn_host( $zone = 'all' ) { |
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global $powered_cache_cdn_addresses; |
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|
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if ( ! isset( $powered_cache_cdn_addresses ) ) { |
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$powered_cache_cdn_addresses = powered_cache_cdn_addresses(); |
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} |
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|
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if ( isset( $powered_cache_cdn_addresses[ $zone ] ) && is_array( $powered_cache_cdn_addresses[ $zone ] ) ) { |
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// if we have multiple host for the same resource get randomly |
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$random_key = array_rand( $powered_cache_cdn_addresses[ $zone ] ); |
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|
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return $powered_cache_cdn_addresses[ $zone ][ $random_key ]; |
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} |
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|
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// fallback to primary host |
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if ( isset( $powered_cache_cdn_addresses['all'] ) && is_array( $powered_cache_cdn_addresses['all'] ) ) { |
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$random_key = array_rand( $powered_cache_cdn_addresses['all'] ); |
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|
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return $powered_cache_cdn_addresses['all'][ $random_key ]; |
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} |
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|
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return false; |
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} |
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|
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} |
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|
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|
