<?php

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/**

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* The plugin vary class to manage X-LiteSpeed-Vary

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*

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* @since 1.1.3

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*/

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namespace LiteSpeed;

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

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class Vary extends Root

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{

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const X_HEADER = 'X-LiteSpeed-Vary';

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private static $_vary_name = '_lscache_vary'; // this default vary cookie is used for logged in status check

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private static $_can_change_vary = false; // Currently only AJAX used this

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/**

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* Adds the actions used for setting up cookies on log in/out.

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*

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* Also checks if the database matches the rewrite rule.

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*

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* @since 1.0.4

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*/

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public function init()

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{

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$this->_update_vary_name();

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}

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/**

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* Update the default vary name if changed

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*

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* @since 4.0

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*/

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private function _update_vary_name()

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{

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$db_cookie = $this->conf(Base::O_CACHE_LOGIN_COOKIE); // [3.0] todo: check if works in network's sites

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// If no vary set in rewrite rule

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if (!isset($_SERVER['LSCACHE_VARY_COOKIE'])) {

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if ($db_cookie) {

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// Display cookie error msg to admin

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if (is_multisite() ? is_network_admin() : is_admin()) {

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Admin_Display::show_error_cookie();

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}

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Control::set_nocache('vary cookie setting error');

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return;

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}

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return;

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}

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// If db setting does not exist, skip checking db value

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if (!$db_cookie) {

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return;

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}

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// beyond this point, need to make sure db vary setting is in $_SERVER env.

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$vary_arr = explode(',', $_SERVER['LSCACHE_VARY_COOKIE']);

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if (in_array($db_cookie, $vary_arr)) {

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self::$_vary_name = $db_cookie;

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return;

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}

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if (is_multisite() ? is_network_admin() : is_admin()) {

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Admin_Display::show_error_cookie();

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}

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Control::set_nocache('vary cookie setting lost error');

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}

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/**

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* Hooks after user init

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*

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* @since 4.0

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*/

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public function after_user_init()

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{

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// logged in user

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if (Router::is_logged_in()) {

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// If not esi, check cache logged-in user setting

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

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// If cache logged-in, then init cacheable to private

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if ($this->conf(Base::O_CACHE_PRIV)) {

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add_action('wp_logout', __NAMESPACE__ . '\Purge::purge_on_logout');

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$this->cls('Control')->init_cacheable();

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Control::set_private('logged in user');

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}

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// No cache for logged-in user

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else {

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Control::set_nocache('logged in user');

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}

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}

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// ESI is on, can be public cache

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else {

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// Need to make sure vary is using group id

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$this->cls('Control')->init_cacheable();

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}

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// register logout hook to clear login status

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add_action('clear_auth_cookie', array($this, 'remove_logged_in'));

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} else {

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// Only after vary init, can detect if is Guest mode or not

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$this->_maybe_guest_mode();

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// Set vary cookie for logging in user, otherwise the user will hit public with vary=0 (guest version)

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add_action('set_logged_in_cookie', array($this, 'add_logged_in'), 10, 4);

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add_action('wp_login', __NAMESPACE__ . '\Purge::purge_on_logout');

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$this->cls('Control')->init_cacheable();

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// Check `login page` cacheable setting because they don't go through main WP logic

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add_action('login_init', array($this->cls('Tag'), 'check_login_cacheable'), 5);

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if (!empty($_GET['litespeed_guest'])) {

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add_action('wp_loaded', array($this, 'update_guest_vary'), 20);

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}

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}

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// Add comment list ESI

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add_filter('comments_array', array($this, 'check_commenter'));

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// Set vary cookie for commenter.

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add_action('set_comment_cookies', array($this, 'append_commenter'));

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/**

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* Don't change for REST call because they don't carry on user info usually

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* @since 1.6.7

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*/

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add_action('rest_api_init', function () {

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// this hook is fired in `init` hook

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Debug2::debug('[Vary] Rest API init disabled vary change');

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add_filter('litespeed_can_change_vary', '__return_false');

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});

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}

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/**

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* Check if is Guest mode or not

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*

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* @since 4.0

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*/

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private function _maybe_guest_mode()

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{

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if (defined('LITESPEED_GUEST')) {

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Debug2::debug('[Vary] 👒👒 Guest mode ' . (LITESPEED_GUEST ? 'predefined' : 'turned off'));

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return;

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}

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if (!$this->conf(Base::O_GUEST)) {

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return;

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}

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// If vary is set, then not a guest

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if (self::has_vary()) {

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return;

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}

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// If has admin QS, then no guest

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if (!empty($_GET[Router::ACTION])) {

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return;

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}

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if (defined('DOING_AJAX')) {

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return;

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}

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if (defined('DOING_CRON')) {

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return;

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}

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// If is the request to update vary, then no guest

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// Don't need anymore as it is always ajax call

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// Still keep it in case some WP blocked the lightweight guest vary update script, WP can still update the vary

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if (!empty($_GET['litespeed_guest'])) {

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return;

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}

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/* @ref https://wordpress.org/support/topic/checkout-add-to-cart-executed-twice/ */

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if (!empty($_GET['litespeed_guest_off'])) {

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return;

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}

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Debug2::debug('[Vary] 👒👒 Guest mode');

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

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if ($this->conf(Base::O_GUEST_OPTM)) {

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

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}

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}

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/**

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* Update Guest vary

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*

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* @since 4.0

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* @deprecated 4.1 Use independent lightweight guest.vary.php as a replacement

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*/

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public function update_guest_vary()

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{

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// This process must not be cached

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

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$_guest = new Lib\Guest();

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if ($_guest->always_guest() || self::has_vary()) {

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// If contains vary already, don't reload to avoid infinite loop when parent page having browser cache

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!defined('LITESPEED_GUEST') && define('LITESPEED_GUEST', true); // Reuse this const to bypass set vary in vary finalize

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Debug2::debug('[Vary] 🤠🤠 Guest');

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echo '[]';

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exit();

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}

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Debug2::debug('[Vary] Will update guest vary in finalize');

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// return json

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echo \json_encode(array('reload' => 'yes'));

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exit();

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}

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/**

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* Hooked to the comments_array filter.

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*

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* Check if the user accessing the page has the commenter cookie.

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*

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* If the user does not want to cache commenters, just check if user is commenter.

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* Otherwise if the vary cookie is set, unset it. This is so that when the page is cached, the page will appear as if the user was a normal user.

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* Normal user is defined as not a logged in user and not a commenter.

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*

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* @since 1.0.4

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* @access public

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* @global type $post

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* @param array $comments The current comments to output

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* @return array The comments to output.

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*/

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public function check_commenter($comments)

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{

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/**

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* Hook to bypass pending comment check for comment related plugins compatibility

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* @since 2.9.5

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*/

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if (apply_filters('litespeed_vary_check_commenter_pending', true)) {

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$pending = false;

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foreach ($comments as $comment) {

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if (!$comment->comment_approved) {

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// current user has pending comment

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$pending = true;

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break;

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}

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}

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// No pending comments, don't need to add private cache

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if (!$pending) {

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Debug2::debug('[Vary] No pending comment');

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$this->remove_commenter();

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// Remove commenter prefilled info if exists, for public cache

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foreach ($_COOKIE as $cookie_name => $cookie_value) {

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if (strlen($cookie_name) >= 15 && strpos($cookie_name, 'comment_author_') === 0) {

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unset($_COOKIE[$cookie_name]);

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}

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}

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return $comments;

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}

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}

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// Current user/visitor has pending comments

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// set vary=2 for next time vary lookup

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$this->add_commenter();

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if ($this->conf(Base::O_CACHE_COMMENTER)) {

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Control::set_private('existing commenter');

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} else {

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Control::set_nocache('existing commenter');

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}

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return $comments;

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}

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/**

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* Check if default vary has a value

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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 has_vary()

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{

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if (empty($_COOKIE[self::$_vary_name])) {

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return false;

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}

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return $_COOKIE[self::$_vary_name];

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}

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/**

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* Append user status with logged in

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*

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* @since 1.1.3

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* @since 1.6.2 Removed static referral

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* @access public

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*/

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public function add_logged_in($logged_in_cookie = false, $expire = false, $expiration = false, $uid = false)

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{

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Debug2::debug('[Vary] add_logged_in');

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/**

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* NOTE: Run before `$this->_update_default_vary()` to make vary changeable

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* @since 2.2.2

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*/

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self::can_ajax_vary();

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// If the cookie is lost somehow, set it

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$this->_update_default_vary($uid, $expire);

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}

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/**

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* Remove user logged in status

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*

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* @since 1.1.3

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* @since 1.6.2 Removed static referral

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* @access public

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*/

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public function remove_logged_in()

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{

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Debug2::debug('[Vary] remove_logged_in');

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/**

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* NOTE: Run before `$this->_update_default_vary()` to make vary changeable

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* @since 2.2.2

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*/

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self::can_ajax_vary();

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// Force update vary to remove login status

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$this->_update_default_vary(-1);

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}

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/**

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* Allow vary can be changed for ajax calls

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*

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* @since 2.2.2

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* @since 2.6 Changed to static

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* @access public

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*/

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public static function can_ajax_vary()

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{

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Debug2::debug('[Vary] _can_change_vary -> true');

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self::$_can_change_vary = true;

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}

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/**

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* Check if can change default vary

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*

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* @since 1.6.2

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* @access private

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*/

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private function can_change_vary()

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{

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// Don't change for ajax due to ajax not sending webp header

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if (Router::is_ajax()) {

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if (!self::$_can_change_vary) {

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Debug2::debug('[Vary] can_change_vary bypassed due to ajax call');

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return false;

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}

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}

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/**

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* POST request can set vary to fix #820789 login "loop" guest cache issue

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* @since 1.6.5

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*/

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if (isset($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] !== 'GET' && $_SERVER['REQUEST_METHOD'] !== 'POST') {

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Debug2::debug('[Vary] can_change_vary bypassed due to method not get/post');

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return false;

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}

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/**

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* Disable vary change if is from crawler

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* @since 2.9.8 To enable woocommerce cart not empty warm up (@Taba)

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*/

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if (!empty($_SERVER['HTTP_USER_AGENT']) && strpos($_SERVER['HTTP_USER_AGENT'], Crawler::FAST_USER_AGENT) === 0) {

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Debug2::debug('[Vary] can_change_vary bypassed due to crawler');

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return false;

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}

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if (!apply_filters('litespeed_can_change_vary', true)) {

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Debug2::debug('[Vary] can_change_vary bypassed due to litespeed_can_change_vary hook');

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return false;

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}

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return true;

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}

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/**

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* Update default vary

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*

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* @since 1.6.2

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* @since 1.6.6.1 Add ran check to make it only run once ( No run multiple times due to login process doesn't have valid uid )

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* @access private

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*/

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private function _update_default_vary($uid = false, $expire = false)

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{

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// Make sure header output only run once

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if (!defined('LITESPEED_DID_' . __FUNCTION__)) {

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define('LITESPEED_DID_' . __FUNCTION__, true);

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} else {

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Debug2::debug2('[Vary] _update_default_vary bypassed due to run already');

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return;

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}

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// If the cookie is lost somehow, set it

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$vary = $this->finalize_default_vary($uid);

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$current_vary = self::has_vary();

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if ($current_vary !== $vary && $current_vary !== 'commenter' && $this->can_change_vary()) {

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// $_COOKIE[ self::$_vary_name ] = $vary; // not needed

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// save it

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if (!$expire) {

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$expire = time() + 2 * DAY_IN_SECONDS;

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}

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$this->_cookie($vary, $expire);

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Debug2::debug("[Vary] set_cookie ---> $vary");

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// Control::set_nocache( 'changing default vary' . " $current_vary => $vary" );

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}

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}

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/**

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* Get vary name

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*

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* @since 1.9.1

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* @access public

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*/

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public function get_vary_name()

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{

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return self::$_vary_name;

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}

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/**

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* Check if one user role is in vary group settings

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*

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* @since 1.2.0

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* @since 3.0 Moved here from conf.cls

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* @access public

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* @param string $role The user role

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* @return int The set value if already set

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*/

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public function in_vary_group($role)

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{

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$group = 0;

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$vary_groups = $this->conf(Base::O_CACHE_VARY_GROUP);

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$roles = explode(',', $role);

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if ($found = array_intersect($roles, array_keys($vary_groups))) {

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$groups = array();

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foreach ($found as $curr_role) {

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$groups[] = $vary_groups[$curr_role];

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}

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$group = implode(',', array_unique($groups));

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} elseif (in_array('administrator', $roles)) {

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$group = 99;

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}

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if ($group) {

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Debug2::debug2('[Vary] role in vary_group [group] ' . $group);

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}

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return $group;

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}

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[465] Fix | Delete

/**

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* Finalize default Vary Cookie

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*

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* Get user vary tag based on admin_bar & role

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*

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* NOTE: Login process will also call this because it does not call wp hook as normal page loading

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*

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* @since 1.6.2

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* @access public

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*/

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public function finalize_default_vary($uid = false)

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{

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// Must check this to bypass vary generation for guests

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// Must check this to avoid Guest page's CSS/JS/CCSS/UCSS get non-guest vary filename

[479] Fix | Delete

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

[480] Fix | Delete

return false;

[481] Fix | Delete

}

[482] Fix | Delete

[483] Fix | Delete

$vary = array();

[484] Fix | Delete

[485] Fix | Delete

if ($this->conf(Base::O_GUEST)) {

[486] Fix | Delete

$vary['guest_mode'] = 1;

[487] Fix | Delete

}

[488] Fix | Delete

[489] Fix | Delete

if (!$uid) {

[490] Fix | Delete

$uid = get_current_user_id();

[491] Fix | Delete

} else {

[492] Fix | Delete

Debug2::debug('[Vary] uid: ' . $uid);

[493] Fix | Delete

}

[494] Fix | Delete

[495] Fix | Delete

// get user's group id

[496] Fix | Delete

$role = Router::get_role($uid);

[497] Fix | Delete

[498] Fix | Delete

if ($uid > 0 && $role) {

[499] Fix | Delete