<?php

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/**

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* CDN handling for LiteSpeed Cache.

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*

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* Rewrites eligible asset URLs to configured CDN endpoints and integrates with WordPress filters.

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*

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* @since 1.2.3

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* @package LiteSpeed

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*/

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namespace LiteSpeed;

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defined( 'WPINC' ) || exit();

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/**

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* Class CDN

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*

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* Processes page content and WordPress asset URLs to map to CDN domains according to settings.

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*/

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class CDN extends Root {

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const LOG_TAG = '[CDN]';

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const BYPASS = 'LITESPEED_BYPASS_CDN';

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/**

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* The working HTML/content buffer being processed.

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*

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* @var string

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*/

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private $content;

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/**

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* Whether CDN feature is enabled.

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*

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* @var bool

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*/

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private $_cfg_cdn;

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/**

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* List of original site URLs (may include wildcards) to be replaced.

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*

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* @var string[]

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*/

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private $_cfg_url_ori;

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/**

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* List of directories considered internal/original for CDN rewriting.

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*

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* @var string[]

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*/

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private $_cfg_ori_dir;

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/**

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* CDN mapping rules; keys include mapping kinds or file extensions, values are URL(s).

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*

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* @var array<string,string|string[]>

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*/

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private $_cfg_cdn_mapping = [];

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/**

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* List of URL substrings/regex used to exclude items from CDN.

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*

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* @var string[]

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*/

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private $_cfg_cdn_exclude;

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/**

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* Hosts used by CDN mappings for quick membership checks.

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*

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* @var string[]

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*/

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private $cdn_mapping_hosts = [];

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/**

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* Initialize CDN integration and register filters if enabled.

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*

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* @since 1.2.3

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* @return void

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*/

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public function init() {

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self::debug2( 'init' );

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if ( defined( self::BYPASS ) ) {

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self::debug2( 'CDN bypass' );

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return;

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}

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if ( ! Router::can_cdn() ) {

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if ( ! defined( self::BYPASS ) ) {

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define( self::BYPASS, true );

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}

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return;

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}

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$this->_cfg_cdn = $this->conf( Base::O_CDN );

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if ( ! $this->_cfg_cdn ) {

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if ( ! defined( self::BYPASS ) ) {

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define( self::BYPASS, true );

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}

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return;

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}

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$this->_cfg_url_ori = $this->conf( Base::O_CDN_ORI );

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// Parse cdn mapping data to array( 'filetype' => 'url' )

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$mapping_to_check = [ Base::CDN_MAPPING_INC_IMG, Base::CDN_MAPPING_INC_CSS, Base::CDN_MAPPING_INC_JS ];

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foreach ( $this->conf( Base::O_CDN_MAPPING ) as $v ) {

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if ( ! $v[ Base::CDN_MAPPING_URL ] ) {

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continue;

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}

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$this_url = $v[ Base::CDN_MAPPING_URL ];

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$this_host = wp_parse_url( $this_url, PHP_URL_HOST );

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// Check img/css/js

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foreach ( $mapping_to_check as $to_check ) {

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if ( $v[ $to_check ] ) {

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self::debug2( 'mapping ' . $to_check . ' -> ' . $this_url );

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// If filetype to url is one to many, make url be an array

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$this->_append_cdn_mapping( $to_check, $this_url );

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if ( ! in_array( $this_host, $this->cdn_mapping_hosts, true ) ) {

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$this->cdn_mapping_hosts[] = $this_host;

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}

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}

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}

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// Check file types

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if ( $v[ Base::CDN_MAPPING_FILETYPE ] ) {

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foreach ( $v[ Base::CDN_MAPPING_FILETYPE ] as $v2 ) {

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$this->_cfg_cdn_mapping[ Base::CDN_MAPPING_FILETYPE ] = true;

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// If filetype to url is one to many, make url be an array

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$this->_append_cdn_mapping( $v2, $this_url );

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if ( ! in_array( $this_host, $this->cdn_mapping_hosts, true ) ) {

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$this->cdn_mapping_hosts[] = $this_host;

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}

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}

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self::debug2( 'mapping ' . implode( ',', $v[ Base::CDN_MAPPING_FILETYPE ] ) . ' -> ' . $this_url );

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}

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}

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if ( ! $this->_cfg_url_ori || ! $this->_cfg_cdn_mapping ) {

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if ( ! defined( self::BYPASS ) ) {

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define( self::BYPASS, true );

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}

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return;

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}

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$this->_cfg_ori_dir = $this->conf( Base::O_CDN_ORI_DIR );

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// In case user customized upload path

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if ( defined( 'UPLOADS' ) ) {

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$this->_cfg_ori_dir[] = UPLOADS;

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}

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// Check if need preg_replace

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$this->_cfg_url_ori = Utility::wildcard2regex( $this->_cfg_url_ori );

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$this->_cfg_cdn_exclude = $this->conf( Base::O_CDN_EXC );

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if ( ! empty( $this->_cfg_cdn_mapping[ Base::CDN_MAPPING_INC_IMG ] ) ) {

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// Hook to srcset

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if ( function_exists( 'wp_calculate_image_srcset' ) ) {

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add_filter( 'wp_calculate_image_srcset', [ $this, 'srcset' ], 999 );

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}

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// Hook to mime icon

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add_filter( 'wp_get_attachment_image_src', [ $this, 'attach_img_src' ], 999 );

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add_filter( 'wp_get_attachment_url', [ $this, 'url_img' ], 999 );

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}

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if ( ! empty( $this->_cfg_cdn_mapping[ Base::CDN_MAPPING_INC_CSS ] ) ) {

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add_filter( 'style_loader_src', [ $this, 'url_css' ], 999 );

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}

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if ( ! empty( $this->_cfg_cdn_mapping[ Base::CDN_MAPPING_INC_JS ] ) ) {

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add_filter( 'script_loader_src', [ $this, 'url_js' ], 999 );

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}

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add_filter( 'litespeed_buffer_finalize', [ $this, 'finalize' ], 30 );

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}

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/**

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* Associate all filetypes with CDN URL.

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*

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* @since 2.0

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* @access private

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*

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* @param string $filetype Mapping key (e.g., extension or mapping constant).

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* @param string $url CDN base URL to use for this mapping.

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* @return void

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*/

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private function _append_cdn_mapping( $filetype, $url ) {

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// If filetype to url is one to many, make url be an array

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if ( empty( $this->_cfg_cdn_mapping[ $filetype ] ) ) {

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$this->_cfg_cdn_mapping[ $filetype ] = $url;

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} elseif ( is_array( $this->_cfg_cdn_mapping[ $filetype ] ) ) {

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// Append url to filetype

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$this->_cfg_cdn_mapping[ $filetype ][] = $url;

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} else {

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// Convert _cfg_cdn_mapping from string to array

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$this->_cfg_cdn_mapping[ $filetype ] = [ $this->_cfg_cdn_mapping[ $filetype ], $url ];

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}

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}

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/**

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* Whether the given type is included in CDN mappings.

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*

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* @since 1.6.2.1

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*

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* @param string $type 'css' or 'js'.

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* @return bool True if included in CDN.

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*/

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public function inc_type( $type ) {

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if ( 'css' === $type && ! empty( $this->_cfg_cdn_mapping[ Base::CDN_MAPPING_INC_CSS ] ) ) {

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return true;

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}

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if ( 'js' === $type && ! empty( $this->_cfg_cdn_mapping[ Base::CDN_MAPPING_INC_JS ] ) ) {

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return true;

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}

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return false;

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}

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/**

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* Run CDN processing on finalized buffer.

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* NOTE: After cache finalized, cannot change cache control.

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*

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* @since 1.2.3

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* @access public

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*

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* @param string $content The HTML/content buffer.

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* @return string The processed content.

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*/

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public function finalize( $content ) {

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$this->content = $content;

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$this->_finalize();

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return $this->content;

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}

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/**

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* Replace eligible URLs with CDN URLs in the working buffer.

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*

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* @since 1.2.3

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* @access private

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* @return void

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*/

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private function _finalize() {

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if ( defined( self::BYPASS ) ) {

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return;

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}

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self::debug( 'CDN _finalize' );

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// Start replacing img src

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if ( ! empty( $this->_cfg_cdn_mapping[ Base::CDN_MAPPING_INC_IMG ] ) ) {

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$this->_replace_img();

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$this->_replace_inline_css();

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}

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if ( ! empty( $this->_cfg_cdn_mapping[ Base::CDN_MAPPING_FILETYPE ] ) ) {

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$this->_replace_file_types();

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}

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}

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/**

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* Parse all file types and replace according to configured attributes.

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*

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* @since 1.2.3

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* @access private

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* @return void

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*/

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private function _replace_file_types() {

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$ele_to_check = $this->conf( Base::O_CDN_ATTR );

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foreach ( $ele_to_check as $v ) {

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if ( ! $v || false === strpos( $v, '.' ) ) {

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self::debug2( 'replace setting bypassed: no . attribute ' . $v );

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continue;

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}

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self::debug2( 'replace attribute ' . $v );

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$v = explode( '.', $v );

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$attr = preg_quote( $v[1], '#' );

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if ( $v[0] ) {

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$pattern = '#<' . preg_quote( $v[0], '#' ) . '([^>]+)' . $attr . '=([\'"])(.+)\g{2}#iU';

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} else {

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$pattern = '# ' . $attr . '=([\'"])(.+)\g{1}#iU';

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}

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preg_match_all( $pattern, $this->content, $matches );

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if (empty($matches[$v[0] ? 3 : 2])) {

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continue;

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}

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foreach ($matches[$v[0] ? 3 : 2] as $k2 => $url) {

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// self::debug2( 'check ' . $url );

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$postfix = '.' . pathinfo((string) wp_parse_url($url, PHP_URL_PATH), PATHINFO_EXTENSION);

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if (!array_key_exists($postfix, $this->_cfg_cdn_mapping)) {

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// self::debug2( 'non-existed postfix ' . $postfix );

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continue;

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}

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self::debug2( 'matched file_type ' . $postfix . ' : ' . $url );

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$url2 = $this->rewrite( $url, Base::CDN_MAPPING_FILETYPE, $postfix );

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if ( ! $url2 ) {

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continue;

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}

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$attr_str = str_replace( $url, $url2, $matches[0][ $k2 ] );

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$this->content = str_replace( $matches[0][ $k2 ], $attr_str, $this->content );

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}

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}

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}

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/**

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* Parse all images and replace their src attributes.

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*

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* @since 1.2.3

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* @access private

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* @return void

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*/

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private function _replace_img() {

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preg_match_all( '#<img([^>]+?)src=([\'"\\\]*)([^\'"\s\\\>]+)([\'"\\\]*)([^>]*)>#i', $this->content, $matches );

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foreach ( $matches[3] as $k => $url ) {

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// Check if is a DATA-URI

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if ( false !== strpos( $url, 'data:image' ) ) {

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continue;

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}

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$url2 = $this->rewrite( $url, Base::CDN_MAPPING_INC_IMG );

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if ( ! $url2 ) {

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continue;

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}

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$html_snippet = sprintf( '<img %1$s src=%2$s %3$s>', $matches[1][ $k ], $matches[2][ $k ] . $url2 . $matches[4][ $k ], $matches[5][ $k ] );

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$this->content = str_replace( $matches[0][ $k ], $html_snippet, $this->content );

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}

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}

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/**

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* Parse and replace all inline styles containing url().

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*

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* @since 1.2.3

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* @access private

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* @return void

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*/

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private function _replace_inline_css() {

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self::debug2( '_replace_inline_css', $this->_cfg_cdn_mapping );

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/**

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* Excludes `\` from URL matching

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*

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* @see #959152 - WordPress LSCache CDN Mapping causing malformed URLS

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* @see #685485

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* @since 3.0

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*/

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preg_match_all( '/url\((?![\'"]?data)[\'"]?(.+?)[\'"]?\)/i', $this->content, $matches );

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foreach ( $matches[1] as $k => $url ) {

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$url = str_replace( [ ' ', '\t', '\n', '\r', '\0', '\x0B', '"', "'", '&quot;', '&#039;' ], '', $url );

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// Parse file postfix

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$parsed_url = wp_parse_url( $url, PHP_URL_PATH );

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if ( ! $parsed_url ) {

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continue;

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}

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$postfix = '.' . pathinfo( $parsed_url, PATHINFO_EXTENSION );

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if ( array_key_exists( $postfix, $this->_cfg_cdn_mapping ) ) {

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self::debug2( 'matched file_type ' . $postfix . ' : ' . $url );

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$url2 = $this->rewrite( $url, Base::CDN_MAPPING_FILETYPE, $postfix );

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if ( ! $url2 ) {

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continue;

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}

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} elseif ( in_array( $postfix, [ 'jpg', 'jpeg', 'png', 'gif', 'svg', 'webp', 'avif' ], true ) ) {

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$url2 = $this->rewrite( $url, Base::CDN_MAPPING_INC_IMG );

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if ( ! $url2 ) {

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continue;

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}

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} else {

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continue;

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}

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$attr = str_replace( $matches[1][ $k ], $url2, $matches[0][ $k ] );

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$this->content = str_replace( $matches[0][ $k ], $attr, $this->content );

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}

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self::debug2( '_replace_inline_css done' );

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}

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/**

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* Filter: wp_get_attachment_image_src.

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*

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* @since 1.2.3

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* @since 1.7 Removed static from function.

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* @access public

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*

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* @param array{0:string,1:int,2:int} $img The URL of the attachment image src, the width, the height.

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* @return array{0:string,1:int,2:int}

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*/

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public function attach_img_src( $img ) {

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if ( $img ) {

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$url = $this->rewrite( $img[0], Base::CDN_MAPPING_INC_IMG );

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if ( $url ) {

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$img[0] = $url;

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}

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}

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return $img;

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}

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/**

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* Try to rewrite one image URL with CDN.

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*

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* @since 1.7

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* @access public

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*

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* @param string $url Original URL.

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* @return string URL after rewriting, or original if not applicable.

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*/

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public function url_img( $url ) {

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if ( $url ) {

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$url2 = $this->rewrite( $url, Base::CDN_MAPPING_INC_IMG );

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if ( $url2 ) {

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$url = $url2;

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}

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}

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return $url;

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}

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/**

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* Try to rewrite one CSS URL with CDN.

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*

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* @since 1.7

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* @access public

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*

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* @param string $url Original URL.

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* @return string URL after rewriting, or original if not applicable.

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*/

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public function url_css( $url ) {

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if ( $url ) {

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$url2 = $this->rewrite( $url, Base::CDN_MAPPING_INC_CSS );

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if ( $url2 ) {

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$url = $url2;

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}

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}

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return $url;

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}

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[449] Fix | Delete

/**

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* Try to rewrite one JS URL with CDN.

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*

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* @since 1.7

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* @access public

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*

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* @param string $url Original URL.

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* @return string URL after rewriting, or original if not applicable.

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*/

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public function url_js( $url ) {

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if ( $url ) {

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$url2 = $this->rewrite( $url, Base::CDN_MAPPING_INC_JS );

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if ( $url2 ) {

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$url = $url2;

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}

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}

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return $url;

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}

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[468] Fix | Delete

/**

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* Filter responsive image sources for CDN.

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*

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* @since 1.2.3

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* @since 1.7 Removed static from function.

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* @access public

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*

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* @param array<int,array{url:string}> $srcs Srcset array.

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* @return array<int,array{url:string}>

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*/

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public function srcset( $srcs ) {

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if ( $srcs ) {

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foreach ( $srcs as $w => $data ) {

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$url = $this->rewrite( $data['url'], Base::CDN_MAPPING_INC_IMG );

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if ( ! $url ) {

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continue;

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}

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$srcs[ $w ]['url'] = $url;

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}

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}

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return $srcs;

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}

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[491] Fix | Delete

/**

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* Replace an URL with mapped CDN URL, if applicable.

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*

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* @since 1.2.3

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* @access public

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*

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* @param string $url Target URL.

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* @param string $mapping_kind Mapping kind (e.g., Base::CDN_MAPPING_INC_IMG or Base::CDN_MAPPING_FILETYPE).

[499] Fix | Delete