<?php

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/**

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* Optimize CSS handler.

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*

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* @package LiteSpeed

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* @since 2.3

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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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* Optimize CSS handler class.

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*/

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class CSS extends Base {

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const LOG_TAG = '[CSS]';

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const TYPE_GEN_CCSS = 'gen_ccss';

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const TYPE_CLEAR_Q_CCSS = 'clear_q_ccss';

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/**

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* Summary cache.

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*

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* @var array

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*/

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protected $_summary;

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/**

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* Cached CCSS whitelist.

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*

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* @var array|null

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*/

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private $_ccss_whitelist;

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/**

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* Request queue.

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*

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* @var array

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*/

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private $_queue;

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/**

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* Init.

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*

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* @since 3.0

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*/

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public function __construct() {

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$this->_summary = self::get_summary();

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add_filter( 'litespeed_ccss_whitelist', [ $this->cls( 'Data' ), 'load_ccss_whitelist' ] );

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}

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/**

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* HTML lazyload CSS.

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*

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* @since 4.0

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* @return string

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*/

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public function prepare_html_lazy() {

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return '<style>' . implode( ',', $this->conf( self::O_OPTM_HTML_LAZY ) ) . '{content-visibility:auto;contain-intrinsic-size:1px 1000px;}</style>';

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}

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/**

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* Output critical CSS.

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*

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* @since 1.3

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* @access public

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* @return string|null

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*/

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public function prepare_ccss() {

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// Get critical css for current page

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// Note: need to consider mobile

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$rules = $this->_ccss();

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if ( ! $rules ) {

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return null;

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}

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$error_tag = '';

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if ( substr( $rules, 0, 2 ) === '/*' && substr( $rules, -2 ) === '*/' ) {

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Core::comment( 'QUIC.cloud CCSS bypassed due to generation error ❌' );

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$error_tag = ' data-error="failed to generate"';

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}

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// Append default critical css

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$rules .= $this->conf( self::O_OPTM_CCSS_CON );

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return '<style id="litespeed-ccss"' . $error_tag . '>' . $rules . '</style>';

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}

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/**

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* Generate CCSS url tag.

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*

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* @since 4.0

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* @param string $request_url Current request URL.

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* @return string

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*/

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private function _gen_ccss_file_tag( $request_url ) {

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if ( is_404() ) {

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return '404';

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}

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if ( $this->conf( self::O_OPTM_CCSS_PER_URL ) ) {

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return $request_url;

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}

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$sep_uri = $this->conf( self::O_OPTM_CCSS_SEP_URI );

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$hit = false;

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if ( $sep_uri ) {

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$hit = Utility::str_hit_array( $request_url, $sep_uri );

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}

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if ( $sep_uri && $hit ) {

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Debug2::debug( '[CCSS] Separate CCSS due to separate URI setting: ' . $hit );

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return $request_url;

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}

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$pt = Utility::page_type();

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$sep_pt = $this->conf( self::O_OPTM_CCSS_SEP_POSTTYPE );

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if ( in_array( $pt, $sep_pt, true ) ) {

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Debug2::debug( '[CCSS] Separate CCSS due to posttype setting: ' . $pt );

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return $request_url;

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}

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// Per posttype

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return $pt;

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}

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/**

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* The critical css content of the current page.

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*

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* @since 2.3

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* @return string|null

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*/

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private function _ccss() {

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global $wp;

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// get current request url

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$permalink_structure = get_option( 'permalink_structure' );

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if ( ! empty( $permalink_structure ) ) {

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$request_url = trailingslashit( home_url( $wp->request ) );

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} else {

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$qs_add = $wp->query_string ? '?' . (string) $wp->query_string : '' ;

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$request_url = home_url( $wp->request ) . $qs_add;

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}

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$filepath_prefix = $this->_build_filepath_prefix( 'ccss' );

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$url_tag = $this->_gen_ccss_file_tag( $request_url );

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$vary = $this->cls( 'Vary' )->finalize_full_varies();

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$filename = $this->cls( 'Data' )->load_url_file( $url_tag, $vary, 'ccss' );

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if ( $filename ) {

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$static_file = LITESPEED_STATIC_DIR . $filepath_prefix . $filename . '.css';

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if ( file_exists( $static_file ) ) {

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Debug2::debug2( '[CSS] existing ccss ' . $static_file );

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Core::comment( 'QUIC.cloud CCSS loaded ✅ ' . $filepath_prefix . $filename . '.css' );

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return File::read( $static_file );

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}

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}

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$uid = get_current_user_id();

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$ua = isset( $_SERVER['HTTP_USER_AGENT'] )

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? sanitize_text_field( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) )

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: '';

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// Store it to prepare for cron

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Core::comment( 'QUIC.cloud CCSS in queue' );

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$this->_queue = $this->load_queue( 'ccss' );

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if ( count( $this->_queue ) > 500 ) {

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self::debug( 'CCSS Queue is full - 500' );

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return null;

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}

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$queue_k = ( strlen( $vary ) > 32 ? md5( $vary ) : $vary ) . ' ' . $url_tag;

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$this->_queue[ $queue_k ] = [

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'url' => apply_filters( 'litespeed_ccss_url', $request_url ),

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'user_agent' => substr( $ua, 0, 200 ),

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'is_mobile' => $this->_separate_mobile(),

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'is_webp' => $this->cls( 'Media' )->webp_support() ? 1 : 0,

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'uid' => $uid,

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'vary' => $vary,

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'url_tag' => $url_tag,

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]; // Current UA will be used to request

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$this->save_queue( 'ccss', $this->_queue );

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self::debug( 'Added queue_ccss [url_tag] ' . $url_tag . ' [UA] ' . $ua . ' [vary] ' . $vary . ' [uid] ' . $uid );

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// Prepare cache tag for later purge

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Tag::add( 'CCSS.' . md5( $queue_k ) );

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return null;

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}

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/**

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* Cron ccss generation.

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*

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* @since 2.3

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* @access private

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*

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* @param bool $should_continue Continue processing multiple items.

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* @return mixed

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*/

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public static function cron_ccss( $should_continue = false ) {

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$_instance = self::cls();

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return $_instance->_cron_handler( 'ccss', $should_continue );

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}

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/**

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* Handle UCSS/CCSS cron.

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*

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* @since 4.2

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*

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* @param string $type Job type: 'ccss' or 'ucss'.

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* @param bool $should_continue Continue processing multiple items.

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* @return void

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*/

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private function _cron_handler( $type, $should_continue ) {

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$this->_queue = $this->load_queue( $type );

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if ( empty( $this->_queue ) ) {

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return;

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}

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$type_tag = strtoupper( $type );

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// For cron, need to check request interval too

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if ( ! $should_continue ) {

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if ( ! empty( $this->_summary[ 'curr_request_' . $type ] ) && time() - (int) $this->_summary[ 'curr_request_' . $type ] < 300 && ! $this->conf( self::O_DEBUG ) ) {

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Debug2::debug( '[' . $type_tag . '] Last request not done' );

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return;

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}

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}

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$i = 0;

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

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if ( ! empty( $v['_status'] ) ) {

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continue;

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}

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Debug2::debug( '[' . $type_tag . '] cron job [tag] ' . $k . ' [url] ' . $v['url'] . ( $v['is_mobile'] ? ' 📱 ' : '' ) . ' [UA] ' . $v['user_agent'] );

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if ( 'ccss' === $type && empty( $v['url_tag'] ) ) {

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unset( $this->_queue[ $k ] );

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$this->save_queue( $type, $this->_queue );

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Debug2::debug( '[CCSS] wrong queue_ccss format' );

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continue;

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}

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if ( ! isset( $v['is_webp'] ) ) {

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$v['is_webp'] = false;

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}

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++$i;

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$res = $this->_send_req( $v['url'], $k, $v['uid'], $v['user_agent'], $v['vary'], $v['url_tag'], $type, $v['is_mobile'], $v['is_webp'] );

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if ( ! $res ) {

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// Status is wrong, drop this this->_queue

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unset( $this->_queue[ $k ] );

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$this->save_queue( $type, $this->_queue );

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if ( ! $should_continue ) {

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return;

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}

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if ( $i > 3 ) {

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GUI::print_loading( count( $this->_queue ), $type_tag );

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return Router::self_redirect( Router::ACTION_CSS, self::TYPE_GEN_CCSS );

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}

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continue;

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}

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// Exit queue if out of quota or service is hot

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if ( 'out_of_quota' === $res || 'svc_hot' === $res ) {

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return;

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}

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$this->_queue[ $k ]['_status'] = 'requested';

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$this->save_queue( $type, $this->_queue );

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// only request first one

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if ( ! $should_continue ) {

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return;

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}

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if ( $i > 3 ) {

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GUI::print_loading( count( $this->_queue ), $type_tag );

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return Router::self_redirect( Router::ACTION_CSS, self::TYPE_GEN_CCSS );

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}

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}

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}

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/**

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* Send to QC API to generate CCSS/UCSS.

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*

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* @since 2.3

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* @access private

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*

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* @param string $request_url Request URL.

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* @param string $queue_k Queue key.

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* @param int $uid WP User ID.

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* @param string $user_agent User agent string.

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* @param string $vary Vary string.

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* @param string $url_tag URL tag.

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* @param string $type Type: 'ccss' or 'ucss'.

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* @param bool $is_mobile Is mobile.

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* @param bool $is_webp Has webp support.

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* @return bool|string True on success, 'out_of_quota' / 'svc_hot' on special cases, false on failure.

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*/

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private function _send_req( $request_url, $queue_k, $uid, $user_agent, $vary, $url_tag, $type, $is_mobile, $is_webp ) {

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// Check if has credit to push or not

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$err = false;

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$allowance = $this->cls( 'Cloud' )->allowance( Cloud::SVC_CCSS, $err );

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if ( ! $allowance ) {

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Debug2::debug( '[CCSS] ❌ No credit: ' . $err );

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$err && Admin_Display::error( Error::msg( $err ) );

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return 'out_of_quota';

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}

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set_time_limit( 120 );

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// Update css request status

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$this->_summary[ 'curr_request_' . $type ] = time();

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self::save_summary();

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// Gather guest HTML to send

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$html = $this->prepare_html( $request_url, $user_agent, $uid );

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if ( ! $html ) {

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return false;

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}

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// Parse HTML to gather all CSS content before requesting

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list( $css, $html ) = $this->prepare_css( $html, $is_webp );

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if ( ! $css ) {

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$type_tag = strtoupper( $type );

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Debug2::debug( '[' . $type_tag . '] ❌ No combined css' );

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return false;

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}

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// Generate critical css

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$data = [

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'url' => $request_url,

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'queue_k' => $queue_k,

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'user_agent' => $user_agent,

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'is_mobile' => $is_mobile ? 1 : 0, // todo:compatible w/ tablet

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'is_webp' => $is_webp ? 1 : 0,

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'html' => $html,

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'css' => $css,

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];

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if ( ! isset( $this->_ccss_whitelist ) ) {

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$this->_ccss_whitelist = $this->_filter_whitelist();

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}

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$data['whitelist'] = $this->_ccss_whitelist;

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self::debug( 'Generating: ', $data );

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$json = Cloud::post( Cloud::SVC_CCSS, $data, 30 );

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if ( ! is_array( $json ) ) {

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return $json;

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}

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// Old version compatibility

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if ( empty( $json['status'] ) ) {

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if ( ! empty( $json[ $type ] ) ) {

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$this->_save_con( $type, $json[ $type ], $queue_k, $is_mobile, $is_webp );

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}

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// Delete the row

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return false;

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}

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// Unknown status, remove this line

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if ( 'queued' !== $json['status'] ) {

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return false;

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}

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// Save summary data

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$this->_summary[ 'last_spent_' . $type ] = time() - (int) $this->_summary[ 'curr_request_' . $type ];

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$this->_summary[ 'last_request_' . $type ] = $this->_summary[ 'curr_request_' . $type ];

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$this->_summary[ 'curr_request_' . $type ] = 0;

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self::save_summary();

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return true;

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}

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/**

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* Save CCSS/UCSS content.

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*

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* @since 4.2

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*

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* @param string $type Type: 'ccss' or 'ucss'.

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* @param string $css CSS content.

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* @param string $queue_k Queue key.

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* @param bool $mobile Is mobile.

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* @param bool $webp Has webp support.

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* @return void

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*/

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private function _save_con( $type, $css, $queue_k, $mobile, $webp ) {

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// Add filters

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$css = apply_filters( 'litespeed_' . $type, $css, $queue_k );

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Debug2::debug2( '[CSS] con: ' . $css );

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if ( substr( $css, 0, 2 ) === '/*' && substr( $css, -2 ) === '*/' ) {

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self::debug( '❌ empty ' . $type . ' [content] ' . $css );

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// continue; // Save the error info too

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}

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// Write to file

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$filecon_md5 = md5( $css );

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$filepath_prefix = $this->_build_filepath_prefix( $type );

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$static_file = LITESPEED_STATIC_DIR . $filepath_prefix . $filecon_md5 . '.css';

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File::save( $static_file, $css, true );

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$url_tag = $this->_queue[ $queue_k ]['url_tag'];

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$vary = $this->_queue[ $queue_k ]['vary'];

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Debug2::debug2( "[CSS] Save URL to file [file] $static_file [vary] $vary" );

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$this->cls( 'Data' )->save_url( $url_tag, $vary, $type, $filecon_md5, dirname( $static_file ), $mobile, $webp );

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Purge::add( strtoupper( $type ) . '.' . md5( $queue_k ) );

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}

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/**

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* Play for fun.

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*

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* @since 3.4.3

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*

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* @param string $request_url URL to test.

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* @return void

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*/

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public function test_url( $request_url ) {

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$user_agent = isset( $_SERVER['HTTP_USER_AGENT'] ) ? sanitize_text_field( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ) : '';

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$html = $this->prepare_html( $request_url, $user_agent );

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list( $css, $html ) = $this->prepare_css( $html, true, true );

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$data = [

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'url' => $request_url,

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'ccss_type' => 'test',

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'user_agent' => $user_agent,

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'is_mobile' => 0,

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'html' => $html,

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'css' => $css,

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'type' => 'CCSS',

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];

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$json = Cloud::post( Cloud::SVC_CCSS, $data, 180 );

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Debug2::debug2( '[CSS][test_url] response', $json );

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}

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/**

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* Prepare HTML from URL.

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*

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* @since 3.4.3

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*

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* @param string $request_url URL to fetch.

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* @param string $user_agent User agent to use.

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* @param int|bool $uid Optional user ID for simulation.

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* @return string|false

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*/

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public function prepare_html( $request_url, $user_agent, $uid = false ) {

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$html = $this->cls( 'Crawler' )->self_curl( add_query_arg( 'LSCWP_CTRL', 'before_optm', $request_url ), $user_agent, $uid );

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Debug2::debug2( '[CSS] self_curl result....', $html );

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if ( ! $html ) {

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return false;

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}

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$html = $this->cls( 'Optimizer' )->html_min( $html, true );

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// Drop <noscript>xxx</noscript>

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$html = preg_replace( '#<noscript>.*</noscript>#isU', '', $html );

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return $html;

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}

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[479] Fix | Delete

/**

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* Prepare CSS from HTML for CCSS generation only. UCSS will use combined CSS directly.

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* Prepare refined HTML for both CCSS and UCSS.

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*

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* @since 3.4.3

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*

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* @param string $html HTML content.

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* @param bool $is_webp Convert backgrounds to WebP when supported.

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* @param bool $dryrun If true, do not fetch external CSS files.

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* @return array{0:string,1:string} [combined CSS, refined HTML]

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*/

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public function prepare_css( $html, $is_webp = false, $dryrun = false ) {

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$css = '';

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preg_match_all( '#<link ([^>]+)/?>|<style([^>]*)>([^<]+)</style>#isU', $html, $matches, PREG_SET_ORDER );

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foreach ( $matches as $match ) {

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$debug_info = '';

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if ( strpos( $match[0], '<link' ) === 0 ) {

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$attrs = Utility::parse_attr( $match[1] );

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if ( empty( $attrs['rel'] ) ) {

[499] Fix | Delete