<?php

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/**

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* Manage the X-LiteSpeed-Vary behavior and vary cookie.

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*

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* @since 1.1.3

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* @package LiteSpeed

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*/

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namespace LiteSpeed;

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

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/**

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* Handles detection of user state (guest, logged-in, commenter, etc.)

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* and builds the X-LiteSpeed-Vary header and vary cookie accordingly.

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*/

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class Vary extends Root {

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/**

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* Log tag used in debug output.

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*

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* @var string

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*/

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const LOG_TAG = '🔱';

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/**

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* Vary header name.

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*

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* @var string

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*/

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const X_HEADER = 'X-LiteSpeed-Vary';

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/**

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* Default vary cookie name (used for logged-in/commenter state).

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*

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* @var string

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*/

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private static $_vary_name = '_lscache_vary';

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/**

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* Whether Ajax calls are permitted to change the vary cookie.

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*

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* @var bool

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*/

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private static $_can_change_vary = false;

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/**

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* Update the default vary cookie name if site settings require it.

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*

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* @since 4.0

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* @since 7.0 Moved to after_user_init to allow ESI no-vary no conflict.

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* @return void

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*/

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private function _update_vary_name() {

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$db_cookie = $this->conf( Base::O_CACHE_LOGIN_COOKIE ); // network aware in v3.0.

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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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// Check for ESI no-vary control.

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$something_wrong = true;

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if ( ! empty( $_GET[ ESI::QS_ACTION ] ) && ! empty( $_GET['_control'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended

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$control_raw = wp_unslash( (string) $_GET['_control'] ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

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$control = array_map( 'sanitize_text_field', explode( ',', $control_raw ) );

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if ( in_array( 'no-vary', $control, true ) ) {

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self::debug( 'no-vary control existed, bypass vary_name update' );

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$something_wrong = false;

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self::$_vary_name = $db_cookie;

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}

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}

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if ( defined( 'LITESPEED_CLI' ) || wp_doing_cron() ) {

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$something_wrong = false;

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}

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if ( $something_wrong ) {

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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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}

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}

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return;

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}

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// DB setting does not exist – nothing to check.

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if ( ! $db_cookie ) {

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return;

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}

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// Beyond this point, ensure DB vary is present in $_SERVER env.

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$server_raw = wp_unslash( (string) $_SERVER['LSCACHE_VARY_COOKIE'] ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

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$vary_arr = array_map( 'trim', explode( ',', $server_raw ) );

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

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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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* Run after user init to set up vary/caching for current request.

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*

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* @since 4.0

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* @return void

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*/

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public function after_user_init() {

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$this->_update_vary_name();

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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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// Cache logged-in => private cache.

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

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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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} else {

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// No cache for logged-in user.

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

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}

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} elseif ( ! is_admin() ) {

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// ESI is on; can be public cache, but ensure cacheable is initialized.

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

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}

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// Clear login state on logout.

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add_action( 'clear_auth_cookie', [ $this, 'remove_logged_in' ] );

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} else {

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// Only after vary init we can detect guest mode.

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$this->_maybe_guest_mode();

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// Set vary cookie when user logs in (to avoid guest vary).

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add_action( 'set_logged_in_cookie', [ $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 — login page doesn't go through main WP logic.

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

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// Optional lightweight guest vary updater.

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if ( ! empty( $_GET['litespeed_guest'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended

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add_action( 'wp_loaded', [ $this, 'update_guest_vary' ], 20 );

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}

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}

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// Commenter checks.

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add_filter( 'comments_array', [ $this, 'check_commenter' ] );

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// Set vary cookie for commenter.

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add_action( 'set_comment_cookies', [ $this, 'append_commenter' ] );

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// REST: don't change vary because they don't carry on user info usually.

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add_action(

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'rest_api_init',

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function () {

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self::debug( '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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/**

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* Mark request as Guest mode when applicable.

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*

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* @since 4.0

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* @return void

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*/

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private function _maybe_guest_mode() {

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if ( defined( 'LITESPEED_GUEST' ) ) {

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self::debug( '👒👒 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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// Admin QS present? not a guest.

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if ( ! empty( $_GET[ Router::ACTION ] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended

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return;

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}

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if ( wp_doing_ajax() ) {

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return;

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}

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if ( wp_doing_cron() ) {

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return;

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}

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// Request to update vary? not a guest.

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if ( ! empty( $_GET['litespeed_guest'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended

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return;

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}

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// User explicitly turned guest off.

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if ( ! empty( $_GET['litespeed_guest_off'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended

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return;

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}

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self::debug( '👒👒 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 instead.

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* @return void

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*/

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public function update_guest_vary() {

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// 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 (avoid loops).

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

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self::debug( '🤠🤠 Guest' );

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echo '[]';

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exit;

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}

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self::debug( 'Will update guest vary in finalize' );

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// Return JSON to trigger reload.

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echo wp_json_encode( [ 'reload' => 'yes' ] );

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exit;

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}

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/**

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* Filter callback on `comments_array` to mark commenter state.

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*

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* @since 1.0.4

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*

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* @param array $comments The comments to output.

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* @return array Filtered comments.

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*/

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public function check_commenter( $comments ) {

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/**

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* Allow bypassing pending comment check for comment plugins.

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*

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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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$pending = true;

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break;

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}

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}

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// No pending comments => ensure public cache state.

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if ( ! $pending ) {

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self::debug( 'No pending comment' );

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$this->remove_commenter();

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// Remove commenter prefilled info for public cache.

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

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

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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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// Pending comments present — set commenter vary.

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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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*

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* @return false|string Cookie value or false if missing.

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*/

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public static function has_vary() {

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

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return false;

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}

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// Cookie values are not user-displayed; unslash only.

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return wp_unslash( (string) $_COOKIE[ self::$_vary_name ] ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

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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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*

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* @param string|false $logged_in_cookie The logged-in cookie value.

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* @param int|false $expire Expiration timestamp.

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* @param int|false $expiration Unused (WordPress signature).

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* @param int|false $uid User ID.

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* @return void

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*/

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public function add_logged_in( $logged_in_cookie = false, $expire = false, $expiration = false, $uid = false ) { // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.FoundAfterLastUsed

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self::debug( 'add_logged_in' );

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// Allow Ajax vary change during login flow.

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

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self::can_ajax_vary();

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// Ensure vary cookie exists/updated.

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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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* @return void

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*/

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public function remove_logged_in() {

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self::debug( 'remove_logged_in' );

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// Allow Ajax vary change during logout flow.

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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 to 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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* @return void

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*/

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public static function can_ajax_vary() {

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self::debug( '_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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* Whether we can change the default vary right now.

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*

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* @since 1.6.2

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* @return bool

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*/

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private function can_change_vary() {

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// Don't change on Ajax unless explicitly allowed (no webp header).

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if ( Router::is_ajax() && ! self::$_can_change_vary ) {

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self::debug( 'can_change_vary bypassed due to ajax call' );

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return false;

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}

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// Allow only GET/POST.

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

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if (

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isset( $_SERVER['REQUEST_METHOD'] )

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&& 'GET' !== $_SERVER['REQUEST_METHOD']

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&& 'POST' !== $_SERVER['REQUEST_METHOD']

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) {

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self::debug( 'can_change_vary bypassed due to method not get/post' );

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return false;

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}

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// Disable when crawler is making the request.

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if (

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! empty( $_SERVER['HTTP_USER_AGENT'] )

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&& 0 === strpos( wp_unslash( (string) $_SERVER['HTTP_USER_AGENT'] ), Crawler::FAST_USER_AGENT ) // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

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) {

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self::debug( '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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self::debug( '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 cookie (idempotent within a request).

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*

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* @since 1.6.2

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* @since 1.6.6.1 Guard to ensure single run.

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*

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* @param int|false $uid User ID or false.

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* @param int|false $expire Expiration timestamp (default: +2 days).

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* @return void

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*/

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

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// Ensure header output only runs 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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self::debug2( '_update_default_vary bypassed due to run already' );

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return;

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}

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// ESI shouldn't change vary (main page only).

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if ( defined( 'LSCACHE_IS_ESI' ) && LSCACHE_IS_ESI ) {

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self::debug2( '_update_default_vary bypassed due to ESI' );

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return;

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}

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

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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, (int) $expire );

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}

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}

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[446] Fix | Delete

/**

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* Get the current vary cookie name.

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*

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* @since 1.9.1

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* @return string

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*/

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public function get_vary_name() {

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return self::$_vary_name;

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}

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[456] Fix | Delete

/**

[457] Fix | Delete

* Check if a user role is in a configured vary group.

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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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*

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* @param string $role User role(s), comma-separated.

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* @return int|string Group ID or 0.

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*/

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public function in_vary_group( $role ) {

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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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$found = array_intersect( $roles, array_keys( (array) $vary_groups ) );

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if ( $found ) {

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$groups = [];

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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, true ) ) {

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$group = 99;

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}

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if ( $group ) {

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

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}

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return $group;

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}

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/**

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* Finalize default vary cookie value for current user.

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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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*

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* @param int|false $uid Optional user ID.

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* @return false|string False for guests when no vary needed, or hashed vary.

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*/

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public function finalize_default_vary( $uid = false ) {

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