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Editing: cdn.cls.php
<?php /** * CDN handling for LiteSpeed Cache. * * Rewrites eligible asset URLs to configured CDN endpoints and integrates with WordPress filters. * * @since 1.2.3 * @package LiteSpeed */ namespace LiteSpeed; defined( 'WPINC' ) || exit(); /** * Class CDN * * Processes page content and WordPress asset URLs to map to CDN domains according to settings. */ class CDN extends Root { const LOG_TAG = '[CDN]'; const BYPASS = 'LITESPEED_BYPASS_CDN'; /** * The working HTML/content buffer being processed. * * @var string */ private $content; /** * Whether CDN feature is enabled. * * @var bool */ private $_cfg_cdn; /** * List of original site URLs (may include wildcards) to be replaced. * * @var string[] */ private $_cfg_url_ori; /** * List of directories considered internal/original for CDN rewriting. * * @var string[] */ private $_cfg_ori_dir; /** * CDN mapping rules; keys include mapping kinds or file extensions, values are URL(s). * * @var array<string,string|string[]> */ private $_cfg_cdn_mapping = []; /** * List of URL substrings/regex used to exclude items from CDN. * * @var string[] */ private $_cfg_cdn_exclude; /** * Hosts used by CDN mappings for quick membership checks. * * @var string[] */ private $cdn_mapping_hosts = []; /** * Initialize CDN integration and register filters if enabled. * * @since 1.2.3 * @return void */ public function init() { self::debug2( 'init' ); if ( defined( self::BYPASS ) ) { self::debug2( 'CDN bypass' ); return; } if ( ! Router::can_cdn() ) { if ( ! defined( self::BYPASS ) ) { define( self::BYPASS, true ); } return; } $this->_cfg_cdn = $this->conf( Base::O_CDN ); if ( ! $this->_cfg_cdn ) { if ( ! defined( self::BYPASS ) ) { define( self::BYPASS, true ); } return; } $this->_cfg_url_ori = $this->conf( Base::O_CDN_ORI ); // Parse cdn mapping data to array( 'filetype' => 'url' ) $mapping_to_check = [ Base::CDN_MAPPING_INC_IMG, Base::CDN_MAPPING_INC_CSS, Base::CDN_MAPPING_INC_JS ]; foreach ( $this->conf( Base::O_CDN_MAPPING ) as $v ) { if ( ! $v[ Base::CDN_MAPPING_URL ] ) { continue; } $this_url = $v[ Base::CDN_MAPPING_URL ]; $this_host = wp_parse_url( $this_url, PHP_URL_HOST ); // Check img/css/js foreach ( $mapping_to_check as $to_check ) { if ( $v[ $to_check ] ) { self::debug2( 'mapping ' . $to_check . ' -> ' . $this_url ); // If filetype to url is one to many, make url be an array $this->_append_cdn_mapping( $to_check, $this_url ); if ( ! in_array( $this_host, $this->cdn_mapping_hosts, true ) ) { $this->cdn_mapping_hosts[] = $this_host; } } } // Check file types if ( $v[ Base::CDN_MAPPING_FILETYPE ] ) { foreach ( $v[ Base::CDN_MAPPING_FILETYPE ] as $v2 ) { $this->_cfg_cdn_mapping[ Base::CDN_MAPPING_FILETYPE ] = true; // If filetype to url is one to many, make url be an array $this->_append_cdn_mapping( $v2, $this_url ); if ( ! in_array( $this_host, $this->cdn_mapping_hosts, true ) ) { $this->cdn_mapping_hosts[] = $this_host; } } self::debug2( 'mapping ' . implode( ',', $v[ Base::CDN_MAPPING_FILETYPE ] ) . ' -> ' . $this_url ); } } if ( ! $this->_cfg_url_ori || ! $this->_cfg_cdn_mapping ) { if ( ! defined( self::BYPASS ) ) { define( self::BYPASS, true ); } return; } $this->_cfg_ori_dir = $this->conf( Base::O_CDN_ORI_DIR ); // In case user customized upload path if ( defined( 'UPLOADS' ) ) { $this->_cfg_ori_dir[] = UPLOADS; } // Check if need preg_replace $this->_cfg_url_ori = Utility::wildcard2regex( $this->_cfg_url_ori ); $this->_cfg_cdn_exclude = $this->conf( Base::O_CDN_EXC ); if ( ! empty( $this->_cfg_cdn_mapping[ Base::CDN_MAPPING_INC_IMG ] ) ) { // Hook to srcset if ( function_exists( 'wp_calculate_image_srcset' ) ) { add_filter( 'wp_calculate_image_srcset', [ $this, 'srcset' ], 999 ); } // Hook to mime icon add_filter( 'wp_get_attachment_image_src', [ $this, 'attach_img_src' ], 999 ); add_filter( 'wp_get_attachment_url', [ $this, 'url_img' ], 999 ); } if ( ! empty( $this->_cfg_cdn_mapping[ Base::CDN_MAPPING_INC_CSS ] ) ) { add_filter( 'style_loader_src', [ $this, 'url_css' ], 999 ); } if ( ! empty( $this->_cfg_cdn_mapping[ Base::CDN_MAPPING_INC_JS ] ) ) { add_filter( 'script_loader_src', [ $this, 'url_js' ], 999 ); } add_filter( 'litespeed_buffer_finalize', [ $this, 'finalize' ], 30 ); } /** * Associate all filetypes with CDN URL. * * @since 2.0 * @access private * * @param string $filetype Mapping key (e.g., extension or mapping constant). * @param string $url CDN base URL to use for this mapping. * @return void */ private function _append_cdn_mapping( $filetype, $url ) { // If filetype to url is one to many, make url be an array if ( empty( $this->_cfg_cdn_mapping[ $filetype ] ) ) { $this->_cfg_cdn_mapping[ $filetype ] = $url; } elseif ( is_array( $this->_cfg_cdn_mapping[ $filetype ] ) ) { // Append url to filetype $this->_cfg_cdn_mapping[ $filetype ][] = $url; } else { // Convert _cfg_cdn_mapping from string to array $this->_cfg_cdn_mapping[ $filetype ] = [ $this->_cfg_cdn_mapping[ $filetype ], $url ]; } } /** * Whether the given type is included in CDN mappings. * * @since 1.6.2.1 * * @param string $type 'css' or 'js'. * @return bool True if included in CDN. */ public function inc_type( $type ) { if ( 'css' === $type && ! empty( $this->_cfg_cdn_mapping[ Base::CDN_MAPPING_INC_CSS ] ) ) { return true; } if ( 'js' === $type && ! empty( $this->_cfg_cdn_mapping[ Base::CDN_MAPPING_INC_JS ] ) ) { return true; } return false; } /** * Run CDN processing on finalized buffer. * NOTE: After cache finalized, cannot change cache control. * * @since 1.2.3 * @access public * * @param string $content The HTML/content buffer. * @return string The processed content. */ public function finalize( $content ) { $this->content = $content; $this->_finalize(); return $this->content; } /** * Replace eligible URLs with CDN URLs in the working buffer. * * @since 1.2.3 * @access private * @return void */ private function _finalize() { if ( defined( self::BYPASS ) ) { return; } self::debug( 'CDN _finalize' ); // Start replacing img src if ( ! empty( $this->_cfg_cdn_mapping[ Base::CDN_MAPPING_INC_IMG ] ) ) { $this->_replace_img(); $this->_replace_inline_css(); } if ( ! empty( $this->_cfg_cdn_mapping[ Base::CDN_MAPPING_FILETYPE ] ) ) { $this->_replace_file_types(); } } /** * Parse all file types and replace according to configured attributes. * * @since 1.2.3 * @access private * @return void */ private function _replace_file_types() { $ele_to_check = $this->conf( Base::O_CDN_ATTR ); foreach ( $ele_to_check as $v ) { if ( ! $v || false === strpos( $v, '.' ) ) { self::debug2( 'replace setting bypassed: no . attribute ' . $v ); continue; } self::debug2( 'replace attribute ' . $v ); $v = explode( '.', $v ); $attr = preg_quote( $v[1], '#' ); if ( $v[0] ) { $pattern = '#<' . preg_quote( $v[0], '#' ) . '([^>]+)' . $attr . '=([\'"])(.+)\g{2}#iU'; } else { $pattern = '# ' . $attr . '=([\'"])(.+)\g{1}#iU'; } preg_match_all( $pattern, $this->content, $matches ); if (empty($matches[$v[0] ? 3 : 2])) { continue; } foreach ($matches[$v[0] ? 3 : 2] as $k2 => $url) { // self::debug2( 'check ' . $url ); $postfix = '.' . pathinfo((string) wp_parse_url($url, PHP_URL_PATH), PATHINFO_EXTENSION); if (!array_key_exists($postfix, $this->_cfg_cdn_mapping)) { // self::debug2( 'non-existed postfix ' . $postfix ); continue; } self::debug2( 'matched file_type ' . $postfix . ' : ' . $url ); $url2 = $this->rewrite( $url, Base::CDN_MAPPING_FILETYPE, $postfix ); if ( ! $url2 ) { continue; } $attr_str = str_replace( $url, $url2, $matches[0][ $k2 ] ); $this->content = str_replace( $matches[0][ $k2 ], $attr_str, $this->content ); } } } /** * Parse all images and replace their src attributes. * * @since 1.2.3 * @access private * @return void */ private function _replace_img() { preg_match_all( '#<img([^>]+?)src=([\'"\\\]*)([^\'"\s\\\>]+)([\'"\\\]*)([^>]*)>#i', $this->content, $matches ); foreach ( $matches[3] as $k => $url ) { // Check if is a DATA-URI if ( false !== strpos( $url, 'data:image' ) ) { continue; } $url2 = $this->rewrite( $url, Base::CDN_MAPPING_INC_IMG ); if ( ! $url2 ) { continue; } $html_snippet = sprintf( '<img %1$s src=%2$s %3$s>', $matches[1][ $k ], $matches[2][ $k ] . $url2 . $matches[4][ $k ], $matches[5][ $k ] ); $this->content = str_replace( $matches[0][ $k ], $html_snippet, $this->content ); } } /** * Parse and replace all inline styles containing url(). * * @since 1.2.3 * @access private * @return void */ private function _replace_inline_css() { self::debug2( '_replace_inline_css', $this->_cfg_cdn_mapping ); /** * Excludes `\` from URL matching * * @see #959152 - WordPress LSCache CDN Mapping causing malformed URLS * @see #685485 * @since 3.0 */ preg_match_all( '/url\((?![\'"]?data)[\'"]?(.+?)[\'"]?\)/i', $this->content, $matches ); foreach ( $matches[1] as $k => $url ) { $url = str_replace( [ ' ', '\t', '\n', '\r', '\0', '\x0B', '"', "'", '"', ''' ], '', $url ); // Parse file postfix $parsed_url = wp_parse_url( $url, PHP_URL_PATH ); if ( ! $parsed_url ) { continue; } $postfix = '.' . pathinfo( $parsed_url, PATHINFO_EXTENSION ); if ( array_key_exists( $postfix, $this->_cfg_cdn_mapping ) ) { self::debug2( 'matched file_type ' . $postfix . ' : ' . $url ); $url2 = $this->rewrite( $url, Base::CDN_MAPPING_FILETYPE, $postfix ); if ( ! $url2 ) { continue; } } elseif ( in_array( $postfix, [ 'jpg', 'jpeg', 'png', 'gif', 'svg', 'webp', 'avif' ], true ) ) { $url2 = $this->rewrite( $url, Base::CDN_MAPPING_INC_IMG ); if ( ! $url2 ) { continue; } } else { continue; } $attr = str_replace( $matches[1][ $k ], $url2, $matches[0][ $k ] ); $this->content = str_replace( $matches[0][ $k ], $attr, $this->content ); } self::debug2( '_replace_inline_css done' ); } /** * Filter: wp_get_attachment_image_src. * * @since 1.2.3 * @since 1.7 Removed static from function. * @access public * * @param array{0:string,1:int,2:int} $img The URL of the attachment image src, the width, the height. * @return array{0:string,1:int,2:int} */ public function attach_img_src( $img ) { if ( $img ) { $url = $this->rewrite( $img[0], Base::CDN_MAPPING_INC_IMG ); if ( $url ) { $img[0] = $url; } } return $img; } /** * Try to rewrite one image URL with CDN. * * @since 1.7 * @access public * * @param string $url Original URL. * @return string URL after rewriting, or original if not applicable. */ public function url_img( $url ) { if ( $url ) { $url2 = $this->rewrite( $url, Base::CDN_MAPPING_INC_IMG ); if ( $url2 ) { $url = $url2; } } return $url; } /** * Try to rewrite one CSS URL with CDN. * * @since 1.7 * @access public * * @param string $url Original URL. * @return string URL after rewriting, or original if not applicable. */ public function url_css( $url ) { if ( $url ) { $url2 = $this->rewrite( $url, Base::CDN_MAPPING_INC_CSS ); if ( $url2 ) { $url = $url2; } } return $url; } /** * Try to rewrite one JS URL with CDN. * * @since 1.7 * @access public * * @param string $url Original URL. * @return string URL after rewriting, or original if not applicable. */ public function url_js( $url ) { if ( $url ) { $url2 = $this->rewrite( $url, Base::CDN_MAPPING_INC_JS ); if ( $url2 ) { $url = $url2; } } return $url; } /** * Filter responsive image sources for CDN. * * @since 1.2.3 * @since 1.7 Removed static from function. * @access public * * @param array<int,array{url:string}> $srcs Srcset array. * @return array<int,array{url:string}> */ public function srcset( $srcs ) { if ( $srcs ) { foreach ( $srcs as $w => $data ) { $url = $this->rewrite( $data['url'], Base::CDN_MAPPING_INC_IMG ); if ( ! $url ) { continue; } $srcs[ $w ]['url'] = $url; } } return $srcs; } /** * Replace an URL with mapped CDN URL, if applicable. * * @since 1.2.3 * @access public * * @param string $url Target URL. * @param string $mapping_kind Mapping kind (e.g., Base::CDN_MAPPING_INC_IMG or Base::CDN_MAPPING_FILETYPE). * @param string|false $postfix File extension (with dot) when mapping by file type. * @return string|false Replaced URL on success, false when not applicable. */ public function rewrite( $url, $mapping_kind, $postfix = false ) { self::debug2( 'rewrite ' . $url ); $url_parsed = wp_parse_url( $url ); if ( empty( $url_parsed['path'] ) ) { self::debug2( '-rewrite bypassed: no path' ); return false; } // Only images under wp-content/wp-includes can be replaced $is_internal_folder = Utility::str_hit_array( $url_parsed['path'], $this->_cfg_ori_dir ); if ( ! $is_internal_folder ) { self::debug2( '-rewrite failed: path not match: ' . LSCWP_CONTENT_FOLDER ); return false; } // Check if is external url if ( ! empty( $url_parsed['host'] ) ) { if ( ! Utility::internal( $url_parsed['host'] ) && ! $this->_is_ori_url( $url ) ) { self::debug2( '-rewrite failed: host not internal' ); return false; } } $exclude = Utility::str_hit_array( $url, $this->_cfg_cdn_exclude ); if ( $exclude ) { self::debug2( '-abort excludes ' . $exclude ); return false; } // Fill full url before replacement if ( empty( $url_parsed['host'] ) ) { $url = Utility::uri2url( $url ); self::debug2( '-fill before rewritten: ' . $url ); $url_parsed = wp_parse_url( $url ); } $scheme = ! empty( $url_parsed['scheme'] ) ? $url_parsed['scheme'] . ':' : ''; // Find the mapping url to be replaced to if ( empty( $this->_cfg_cdn_mapping[ $mapping_kind ] ) ) { return false; } if ( Base::CDN_MAPPING_FILETYPE !== $mapping_kind ) { $final_url = $this->_cfg_cdn_mapping[ $mapping_kind ]; } else { // select from file type $final_url = $this->_cfg_cdn_mapping[ $postfix ]; if ( ! $final_url ) { return false; } } // If filetype to url is one to many, need to random one if ( is_array( $final_url ) ) { $final_url = $final_url[ array_rand( $final_url ) ]; } // Now lets replace CDN url foreach ( $this->_cfg_url_ori as $v ) { if ( false !== strpos( $v, '*' ) ) { $url = preg_replace( '#' . $scheme . $v . '#iU', $final_url, $url ); } else { $url = str_replace( $scheme . $v, $final_url, $url ); } } self::debug2( '-rewritten: ' . $url ); return $url; } /** * Check if the given URL matches any configured "original" URLs for CDN. * * @since 2.1 * @access private * * @param string $url URL to test. * @return bool True if URL is one of the originals. */ private function _is_ori_url( $url ) { $url_parsed = wp_parse_url( $url ); $scheme = ! empty( $url_parsed['scheme'] ) ? $url_parsed['scheme'] . ':' : ''; foreach ( $this->_cfg_url_ori as $v ) { $needle = $scheme . $v; if ( false !== strpos( $v, '*' ) ) { if ( preg_match( '#' . $needle . '#iU', $url ) ) { return true; } } elseif ( 0 === strpos( $url, $needle ) ) { return true; } } return false; } /** * Check if the host is one of the CDN mapping hosts. * * @since 1.2.3 * * @param string $host Hostname to check. * @return bool False when bypassed, otherwise true if internal CDN host. */ public static function internal( $host ) { if ( defined( self::BYPASS ) ) { return false; } $instance = self::cls(); return in_array( $host, $instance->cdn_mapping_hosts, true ); // todo: can add $this->_is_ori_url() check in future } }
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