<?php

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/**

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* The ESI class.

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*

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* This is used to define all esi related functions.

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*

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* @since 1.1.3

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* @package LiteSpeed

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* @subpackage LiteSpeed/src

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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 ESI extends Root

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{

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const LOG_TAG = '⏺';

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private static $has_esi = false;

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private static $_combine_ids = array();

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private $admin_rendered = false;

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private $esi_args = null;

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private $_esi_preserve_list = array();

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private $_nonce_actions = array(-1 => ''); // val is cache control

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const QS_ACTION = 'lsesi';

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const QS_PARAMS = 'esi';

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const COMBO = '__combo'; // ESI include combine='main' handler

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const PARAM_ARGS = 'args';

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const PARAM_ID = 'id';

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const PARAM_INSTANCE = 'instance';

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const PARAM_NAME = 'name';

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const WIDGET_O_ESIENABLE = 'widget_esi_enable';

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const WIDGET_O_TTL = 'widget_ttl';

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/**

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* Confructor of ESI

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*

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* @since 1.2.0

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* @since 4.0 Change to be after Vary init in hook 'after_setup_theme'

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*/

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public function init()

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{

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/**

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* Bypass ESI related funcs if disabled ESI to fix potential DIVI compatibility issue

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* @since 2.9.7.2

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*/

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if (Router::is_ajax() || !$this->cls('Router')->esi_enabled()) {

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return;

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}

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// Guest mode, don't need to use ESI

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if (defined('LITESPEED_GUEST') && LITESPEED_GUEST) {

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return;

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}

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if (defined('LITESPEED_ESI_OFF')) {

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return;

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}

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// If page is not cacheable

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if (defined('DONOTCACHEPAGE') && apply_filters('litespeed_const_DONOTCACHEPAGE', DONOTCACHEPAGE)) {

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return;

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}

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// Init ESI in `after_setup_theme` hook after detected if LITESPEED_DISABLE_ALL is ON or not

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$this->_hooks();

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/**

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* Overwrite wp_create_nonce func

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* @since 2.9.5

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*/

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$this->_transform_nonce();

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!defined('LITESPEED_ESI_INITED') && define('LITESPEED_ESI_INITED', true);

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}

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/**

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* Init ESI related hooks

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*

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* Load delayed by hook to give the ability to bypass by LITESPEED_DISABLE_ALL const

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*

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* @since 2.9.7.2

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* @since 4.0 Changed to private from public

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* @access private

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*/

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private function _hooks()

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{

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add_filter('template_include', array($this, 'esi_template'), 99999);

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add_action('load-widgets.php', __NAMESPACE__ . '\Purge::purge_widget');

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add_action('wp_update_comment_count', __NAMESPACE__ . '\Purge::purge_comment_widget');

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/**

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* Recover REQUEST_URI

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* @since 1.8.1

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*/

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if (!empty($_GET[self::QS_ACTION])) {

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self::debug('ESI req');

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$this->_register_esi_actions();

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}

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/**

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* Shortcode ESI

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*

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* To use it, just change the original shortcode as below:

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* old: [someshortcode aa='bb']

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* new: [esi someshortcode aa='bb' cache='private,no-vary' ttl='600']

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*

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* 1. `cache` attribute is optional, default to 'public,no-vary'.

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* 2. `ttl` attribute is optional, default is your public TTL setting.

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* 3. `_ls_silence` attribute is optional, default is false.

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*

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* @since 2.8

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* @since 2.8.1 Check is_admin for Elementor compatibility #726013

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*/

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if (!is_admin()) {

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add_shortcode('esi', array($this, 'shortcode'));

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}

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}

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/**

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* Take over all nonce calls and transform to ESI

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*

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* @since 2.9.5

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*/

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private function _transform_nonce()

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{

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if (is_admin()) {

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return;

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}

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// Load ESI nonces in conf

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$nonces = $this->conf(Base::O_ESI_NONCE);

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add_filter('litespeed_esi_nonces', array($this->cls('Data'), 'load_esi_nonces'));

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if ($nonces = apply_filters('litespeed_esi_nonces', $nonces)) {

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foreach ($nonces as $action) {

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$this->nonce_action($action);

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}

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}

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add_action('litespeed_nonce', array($this, 'nonce_action'));

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}

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/**

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* Register a new nonce action to convert it to ESI

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*

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* @since 2.9.5

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*/

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public function nonce_action($action)

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{

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// Split the Cache Control

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$action = explode(' ', $action);

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$control = !empty($action[1]) ? $action[1] : '';

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$action = $action[0];

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// Wildcard supported

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$action = Utility::wildcard2regex($action);

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if (array_key_exists($action, $this->_nonce_actions)) {

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return;

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}

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$this->_nonce_actions[$action] = $control;

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Debug2::debug('[ESI] Appended nonce action to nonce list [action] ' . $action);

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}

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/**

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* Check if an action is registered to replace ESI

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*

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* @since 2.9.5

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*/

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public function is_nonce_action($action)

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{

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// If GM not run yet, then ESI not init yet, then ESI nonce will not be allowed even nonce func replaced.

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if (!defined('LITESPEED_ESI_INITED')) {

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return null;

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}

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if (is_admin()) {

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return null;

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}

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if (defined('LITESPEED_ESI_OFF')) {

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return null;

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}

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foreach ($this->_nonce_actions as $k => $v) {

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

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if (preg_match('#' . $k . '#iU', $action)) {

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return $v;

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}

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} else {

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if ($k == $action) {

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return $v;

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}

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}

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}

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return null;

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}

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/**

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* Shortcode ESI

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*

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* @since 2.8

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* @access public

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*/

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public function shortcode($atts)

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{

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if (empty($atts[0])) {

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Debug2::debug('[ESI] ===shortcode wrong format', $atts);

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return 'Wrong shortcode esi format';

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}

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$cache = 'public,no-vary';

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if (!empty($atts['cache'])) {

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$cache = $atts['cache'];

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unset($atts['cache']);

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}

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$silence = false;

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if (!empty($atts['_ls_silence'])) {

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$silence = true;

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}

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do_action('litespeed_esi_shortcode-' . $atts[0]);

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// Show ESI link

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return $this->sub_esi_block('esi', 'esi-shortcode', $atts, $cache, $silence);

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}

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/**

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* Check if the requested page has esi elements. If so, return esi on

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* header.

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*

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* @since 1.1.3

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* @access public

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* @return string Esi On header if request has esi, empty string otherwise.

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*/

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public static function has_esi()

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{

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return self::$has_esi;

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}

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/**

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* Sets that the requested page has esi elements.

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*

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* @since 1.1.3

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* @access public

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*/

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public static function set_has_esi()

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{

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self::$has_esi = true;

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}

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/**

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* Register all of the hooks related to the esi logic of the plugin.

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* Specifically when the page IS an esi page.

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*

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* @since 1.1.3

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* @access private

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*/

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private function _register_esi_actions()

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{

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/**

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* This hook is in `init`

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* For any plugin need to check if page is ESI, use `LSCACHE_IS_ESI` check after `init` hook

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*/

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!defined('LSCACHE_IS_ESI') && define('LSCACHE_IS_ESI', $_GET[self::QS_ACTION]); // Reused this to ESI block ID

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!empty($_SERVER['ESI_REFERER']) && defined('LSCWP_LOG') && Debug2::debug('[ESI] ESI_REFERER: ' . $_SERVER['ESI_REFERER']);

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/**

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* Only when ESI's parent is not REST, replace REQUEST_URI to avoid breaking WP5 editor REST call

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* @since 2.9.3

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*/

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if (!empty($_SERVER['ESI_REFERER']) && !$this->cls('REST')->is_rest($_SERVER['ESI_REFERER'])) {

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self::debug('overwrite REQUEST_URI to ESI_REFERER [from] ' . $_SERVER['REQUEST_URI'] . ' [to] ' . $_SERVER['ESI_REFERER']);

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if (!empty($_SERVER['ESI_REFERER'])) {

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$_SERVER['REQUEST_URI'] =

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substr(get_option('permalink_structure'), -1) === '/' && strpos($_SERVER['ESI_REFERER'], '?') === false

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? trailingslashit($_SERVER['ESI_REFERER'])

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: $_SERVER['ESI_REFERER'];

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}

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# Prevent from 301 redirecting

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if (!empty($_SERVER['SCRIPT_URI'])) {

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$SCRIPT_URI = parse_url($_SERVER['SCRIPT_URI']);

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$SCRIPT_URI['path'] = $_SERVER['REQUEST_URI'];

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Utility::compatibility();

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$_SERVER['SCRIPT_URI'] = http_build_url($SCRIPT_URI);

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}

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}

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if (!empty($_SERVER['ESI_CONTENT_TYPE']) && strpos($_SERVER['ESI_CONTENT_TYPE'], 'application/json') === 0) {

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add_filter('litespeed_is_json', '__return_true');

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}

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/**

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* Make REST call be able to parse ESI

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* NOTE: Not effective due to ESI req are all to `/` yet

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* @since 2.9.4

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*/

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add_action('rest_api_init', array($this, 'load_esi_block'), 101);

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// Register ESI blocks

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add_action('litespeed_esi_load-widget', array($this, 'load_widget_block'));

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add_action('litespeed_esi_load-admin-bar', array($this, 'load_admin_bar_block'));

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add_action('litespeed_esi_load-comment-form', array($this, 'load_comment_form_block'));

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add_action('litespeed_esi_load-nonce', array($this, 'load_nonce_block'));

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add_action('litespeed_esi_load-esi', array($this, 'load_esi_shortcode'));

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add_action('litespeed_esi_load-' . self::COMBO, array($this, 'load_combo'));

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}

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/**

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* Hooked to the template_include action.

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* Selects the esi template file when the post type is a LiteSpeed ESI page.

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*

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* @since 1.1.3

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* @access public

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* @param string $template The template path filtered.

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* @return string The new template path.

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*/

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public function esi_template($template)

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{

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// Check if is an ESI request

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if (defined('LSCACHE_IS_ESI')) {

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self::debug('calling ESI template');

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return LSCWP_DIR . 'tpl/esi.tpl.php';

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}

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self::debug('calling default template');

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$this->_register_not_esi_actions();

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return $template;

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}

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/**

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* Register all of the hooks related to the esi logic of the plugin.

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* Specifically when the page is NOT an esi page.

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*

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* @since 1.1.3

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* @access private

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*/

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private function _register_not_esi_actions()

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{

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do_action('litespeed_tpl_normal');

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if (!Control::is_cacheable()) {

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return;

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}

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if (Router::is_ajax()) {

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return;

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}

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add_filter('widget_display_callback', array($this, 'sub_widget_block'), 0, 3);

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// Add admin_bar esi

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if (Router::is_logged_in()) {

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// Remove default Admin bar. Fix https://github.com/elementor/elementor/issues/25198

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remove_action('wp_body_open', 'wp_admin_bar_render', 0);

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add_action('wp_body_open', array($this, 'sub_admin_bar_block'), 0);

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remove_action('wp_footer', 'wp_admin_bar_render', 1000);

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add_action('wp_footer', array($this, 'sub_admin_bar_block'), 1000);

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}

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// Add comment forum esi for logged-in user or commenter

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if (!Router::is_ajax() && Vary::has_vary()) {

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add_filter('comment_form_defaults', array($this, 'register_comment_form_actions'));

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}

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}

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/**

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* Set an ESI to be combine='sub'

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*

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* @since 3.4.2

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*/

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public static function combine($block_id)

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{

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if (!isset($_SERVER['X-LSCACHE']) || strpos($_SERVER['X-LSCACHE'], 'combine') === false) {

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return;

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}

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if (in_array($block_id, self::$_combine_ids)) {

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return;

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}

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self::$_combine_ids[] = $block_id;

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}

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/**

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* Load combined ESI

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*

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* @since 3.4.2

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*/

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public function load_combo()

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{

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Control::set_nocache('ESI combine request');

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if (empty($_POST['esi_include'])) {

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return;

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}

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self::set_has_esi();

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Debug2::debug('[ESI] 🍔 Load combo', $_POST['esi_include']);

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$output = '';

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foreach ($_POST['esi_include'] as $url) {

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$qs = parse_url(htmlspecialchars_decode($url), PHP_URL_QUERY);

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parse_str($qs, $qs);

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if (empty($qs[self::QS_ACTION])) {

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continue;

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}

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$esi_id = $qs[self::QS_ACTION];

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$esi_param = !empty($qs[self::QS_PARAMS]) ? $this->_parse_esi_param($qs[self::QS_PARAMS]) : false;

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$inline_param = apply_filters('litespeed_esi_inline-' . $esi_id, array(), $esi_param); // Returned array need to be [ val, control, tag ]

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if ($inline_param) {

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$output .= self::_build_inline($url, $inline_param);

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}

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}

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echo $output;

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}

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/**

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* Build a whole inline segment

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*

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* @since 3.4.2

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*/

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private static function _build_inline($url, $inline_param)

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{

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if (!$url || empty($inline_param['val']) || empty($inline_param['control']) || empty($inline_param['tag'])) {

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return '';

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}

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$url = esc_attr($url);

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$control = esc_attr($inline_param['control']);

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$tag = esc_attr($inline_param['tag']);

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return "<esi:inline name='$url' cache-control='" . $control . "' cache-tag='" . $tag . "'>" . $inline_param['val'] . '</esi:inline>';

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}

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/**

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* Build the esi url. This method will build the html comment wrapper as well as serialize and encode the parameter array.

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*

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* The block_id parameter should contain alphanumeric and '-_' only.

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*

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* @since 1.1.3

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* @access private

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* @param string $block_id The id to use to display the correct esi block.

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* @param string $wrapper The wrapper for the esi comments.

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* @param array $params The esi parameters.

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* @param string $control The cache control attribute if any.

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* @param bool $silence If generate wrapper comment or not

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* @param bool $preserved If this ESI block is used in any filter, need to temporarily convert it to a string to avoid the HTML tag being removed/filtered.

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* @param bool $svar If store the value in memory or not, in memory will be faster

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* @param array $inline_val If show the current value for current request( this can avoid multiple esi requests in first time cache generating process )

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*/

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public function sub_esi_block(

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$block_id,

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$wrapper,

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$params = array(),

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$control = 'private,no-vary',

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$silence = false,

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$preserved = false,

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$svar = false,

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$inline_param = array()

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) {

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if (empty($block_id) || !is_array($params) || preg_match('/[^\w-]/', $block_id)) {

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return false;

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}

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if (defined('LITESPEED_ESI_OFF')) {

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Debug2::debug('[ESI] ESI OFF so force loading [block_id] ' . $block_id);

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do_action('litespeed_esi_load-' . $block_id, $params);

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return;

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}

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if ($silence) {

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// Don't add comment to esi block ( original for nonce used in tag property data-nonce='esi_block' )

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$params['_ls_silence'] = true;

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}

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if ($this->cls('REST')->is_rest() || $this->cls('REST')->is_internal_rest()) {

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$params['is_json'] = 1;

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}

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$params = apply_filters('litespeed_esi_params', $params, $block_id);

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$control = apply_filters('litespeed_esi_control', $control, $block_id);

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if (!is_array($params) || !is_string($control)) {

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