<?php

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/**

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* The CDN class.

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*

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* @since 1.2.3

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* @since 1.5 Moved into /inc

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* @package LiteSpeed

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* @subpackage LiteSpeed/inc

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* @author LiteSpeed Technologies <info@litespeedtech.com>

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*/

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namespace LiteSpeed;

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

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class CDN extends Root

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{

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const BYPASS = 'LITESPEED_BYPASS_CDN';

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private $content;

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private $_cfg_cdn;

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private $_cfg_url_ori;

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private $_cfg_ori_dir;

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private $_cfg_cdn_mapping = array();

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private $_cfg_cdn_exclude;

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private $cdn_mapping_hosts = array();

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/**

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* Init

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*

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* @since 1.2.3

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*/

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public function init()

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{

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Debug2::debug2('[CDN] init');

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if (defined(self::BYPASS)) {

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Debug2::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 = array(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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$this_host = parse_url($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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Debug2::debug2('[CDN] 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)) {

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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)) {

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$this->cdn_mapping_hosts[] = $this_host;

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}

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}

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Debug2::debug2('[CDN] 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', array($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', array($this, 'attach_img_src'), 999);

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add_filter('wp_get_attachment_url', array($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', array($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', array($this, 'url_js'), 999);

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}

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add_filter('litespeed_buffer_finalize', array($this, 'finalize'), 30);

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}

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/**

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* Associate all filetypes with 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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private function _append_cdn_mapping($filetype, $url)

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{

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

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}

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}

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/**

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* If include css/js in CDN

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*

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* @since 1.6.2.1

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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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{

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

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return true;

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}

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if ($type == 'js' && !empty($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 process

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* NOTE: As this is after cache finalized, can NOT set any cache control anymore

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*

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* @since 1.2.3

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* @access public

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* @return string The content that is after optimization

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*/

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public function finalize($content)

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{

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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 CDN url

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*

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* @since 1.2.3

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* @access private

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*/

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private function _finalize()

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{

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if (defined(self::BYPASS)) {

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return;

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}

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Debug2::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

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*

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* @since 1.2.3

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* @access private

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*/

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private function _replace_file_types()

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{

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

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Debug2::debug2('[CDN] replace setting bypassed: no . attribute ' . $v);

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continue;

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}

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Debug2::debug2('[CDN] 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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// Debug2::debug2( '[CDN] check ' . $url );

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

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

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// Debug2::debug2( '[CDN] non-existed postfix ' . $postfix );

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continue;

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}

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Debug2::debug2('[CDN] matched file_type ' . $postfix . ' : ' . $url);

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if (!($url2 = $this->rewrite($url, Base::CDN_MAPPING_FILETYPE, $postfix))) {

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continue;

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}

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

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$this->content = str_replace($matches[0][$k2], $attr, $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

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*

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* @since 1.2.3

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* @access private

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*/

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private function _replace_img()

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{

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

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continue;

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}

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if (!($url2 = $this->rewrite($url, Base::CDN_MAPPING_INC_IMG))) {

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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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*/

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private function _replace_inline_css()

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{

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Debug2::debug2('[CDN] _replace_inline_css', $this->_cfg_cdn_mapping);

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/**

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* Excludes `\` from URL matching

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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(array(' ', '\t', '\n', '\r', '\0', '\x0B', '"', "'", '&quot;', '&#039;'), '', $url);

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// Parse file postfix

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

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

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Debug2::debug2('[CDN] matched file_type ' . $postfix . ' : ' . $url);

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if (!($url2 = $this->rewrite($url, Base::CDN_MAPPING_FILETYPE, $postfix))) {

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continue;

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}

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

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if (!($url2 = $this->rewrite($url, Base::CDN_MAPPING_INC_IMG))) {

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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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Debug2::debug2('[CDN] _replace_inline_css done');

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}

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/**

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* Hook to 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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* @param array $img The URL of the attachment image src, the width, the height

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* @return array

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*/

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public function attach_img_src($img)

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{

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

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$img[0] = $url;

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}

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return $img;

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}

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[350] Fix | Delete

/**

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* Try to rewrite one 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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public function url_img($url)

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{

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if ($url && ($url2 = $this->rewrite($url, Base::CDN_MAPPING_INC_IMG))) {

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$url = $url2;

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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 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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public function url_css($url)

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{

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if ($url && ($url2 = $this->rewrite($url, Base::CDN_MAPPING_INC_CSS))) {

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$url = $url2;

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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 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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public function url_js($url)

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{

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if ($url && ($url2 = $this->rewrite($url, Base::CDN_MAPPING_INC_JS))) {

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$url = $url2;

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}

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return $url;

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}

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/**

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* Hook to replace WP responsive images

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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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* @param array $srcs

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* @return array

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*/

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public function srcset($srcs)

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{

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if ($srcs) {

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

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

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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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/**

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* Replace URL to CDN URL

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*

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* @since 1.2.3

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* @access public

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* @param string $url

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* @return string Replaced URL

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*/

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public function rewrite($url, $mapping_kind, $postfix = false)

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{

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Debug2::debug2('[CDN] rewrite ' . $url);

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$url_parsed = parse_url($url);

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if (empty($url_parsed['path'])) {

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Debug2::debug2('[CDN] -rewrite bypassed: no path');

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return false;

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}

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// Only images under wp-cotnent/wp-includes can be replaced

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$is_internal_folder = Utility::str_hit_array($url_parsed['path'], $this->_cfg_ori_dir);

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if (!$is_internal_folder) {

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Debug2::debug2('[CDN] -rewrite failed: path not match: ' . LSCWP_CONTENT_FOLDER);

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return false;

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}

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// Check if is external url

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if (!empty($url_parsed['host'])) {

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if (!Utility::internal($url_parsed['host']) && !$this->_is_ori_url($url)) {

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Debug2::debug2('[CDN] -rewrite failed: host not internal');

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return false;

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}

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}

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$exclude = Utility::str_hit_array($url, $this->_cfg_cdn_exclude);

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if ($exclude) {

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Debug2::debug2('[CDN] -abort excludes ' . $exclude);

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return false;

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}

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// Fill full url before replacement

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if (empty($url_parsed['host'])) {

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$url = Utility::uri2url($url);

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Debug2::debug2('[CDN] -fill before rewritten: ' . $url);

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$url_parsed = parse_url($url);

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}

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$scheme = !empty($url_parsed['scheme']) ? $url_parsed['scheme'] . ':' : '';

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if ($scheme) {

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// Debug2::debug2( '[CDN] -scheme from url: ' . $scheme );

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}

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[466] Fix | Delete

// Find the mapping url to be replaced to

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

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return false;

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}

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if ($mapping_kind !== Base::CDN_MAPPING_FILETYPE) {

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$final_url = $this->_cfg_cdn_mapping[$mapping_kind];

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} else {

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// select from file type

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$final_url = $this->_cfg_cdn_mapping[$postfix];

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}

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[477] Fix | Delete

// If filetype to url is one to many, need to random one

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if (is_array($final_url)) {

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$final_url = $final_url[mt_rand(0, count($final_url) - 1)];

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}

[481] Fix | Delete

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// Now lets replace CDN url

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foreach ($this->_cfg_url_ori as $v) {

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

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$url = preg_replace('#' . $scheme . $v . '#iU', $final_url, $url);

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} else {

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$url = str_replace($scheme . $v, $final_url, $url);

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}

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}

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Debug2::debug2('[CDN] -rewritten: ' . $url);

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return $url;

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}

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[495] Fix | Delete

/**

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* Check if is original URL of CDN or not

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*

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* @since 2.1

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