<?php

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/**

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* The ucss class.

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*

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* @since 5.1

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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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* UCSS optimization class.

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*

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* @since 5.1

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*/

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class UCSS extends Base {

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const LOG_TAG = '[UCSS]';

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const TYPE_GEN = 'gen';

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const TYPE_CLEAR_Q = 'clear_q';

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/**

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* Summary data.

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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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* UCSS whitelist selectors.

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*

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* @var array

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*/

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private $_ucss_whitelist;

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/**

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* Queue for UCSS generation.

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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_ucss_whitelist', [ $this->cls( 'Data' ), 'load_ucss_whitelist' ] );

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}

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/**

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* Uniform url tag for ucss usage

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*

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* @since 4.7

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*

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* @param string|false $request_url The request URL.

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* @return string The URL tag.

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*/

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public static function get_url_tag( $request_url = false ) {

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$url_tag = $request_url;

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if (is_404()) {

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$url_tag = '404';

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} elseif (apply_filters('litespeed_ucss_per_pagetype', false)) {

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$url_tag = Utility::page_type();

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self::debug('litespeed_ucss_per_pagetype filter altered url to ' . $url_tag);

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}

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return $url_tag;

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}

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/**

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* Get UCSS path

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*

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* @since 4.0

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*

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* @param string $request_url The request URL.

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* @param bool $dry_run Whether to run in dry mode.

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* @return string|false The UCSS filename or false.

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*/

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public function load( $request_url, $dry_run = false ) {

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// Check UCSS URI excludes

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$ucss_exc = apply_filters( 'litespeed_ucss_exc', $this->conf( self::O_OPTM_UCSS_EXC ) );

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$hit = $ucss_exc ? Utility::str_hit_array( $request_url, $ucss_exc ) : false;

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if ( $hit ) {

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self::debug( 'UCSS bypassed due to UCSS URI Exclude setting: ' . $hit );

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Core::comment( 'QUIC.cloud UCSS bypassed by setting' );

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return false;

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}

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

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$url_tag = self::get_url_tag($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, 'ucss');

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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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self::debug2('existing ucss ' . $static_file);

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// Check if is error comment inside only

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$tmp = File::read($static_file);

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

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self::debug2('existing ucss is error only: ' . $tmp);

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Core::comment('QUIC.cloud UCSS bypassed due to generation error ❌ ' . $filepath_prefix . $filename . '.css');

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return false;

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}

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

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return $filename . '.css';

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}

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}

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if ($dry_run) {

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return false;

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}

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

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$uid = get_current_user_id();

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$ua = $this->_get_ua();

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// Store it for cron

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

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

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

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return false;

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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_ucss_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('ucss', $this->_queue);

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self::debug('Added queue_ucss [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('UCSS.' . md5($queue_k));

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return false;

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}

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/**

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* Get User Agent

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*

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* @since 5.3

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*

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* @return string The user agent string.

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*/

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private function _get_ua() {

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return ! empty( $_SERVER['HTTP_USER_AGENT'] ) ? sanitize_text_field( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ) : '';

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}

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/**

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* Add rows to q

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*

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* @since 5.3

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*

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* @param array $url_files Array of URL file data.

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* @return false|void False if queue is full.

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*/

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public function add_to_q( $url_files ) {

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// Store it for cron

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

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

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

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return false;

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}

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$ua = $this->_get_ua();

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foreach ($url_files as $url_file) {

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$vary = $url_file['vary'];

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$request_url = $url_file['url'];

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$is_mobile = $url_file['mobile'];

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$is_webp = $url_file['webp'];

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$url_tag = self::get_url_tag($request_url);

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

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$q = [

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

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

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'is_mobile' => $is_mobile,

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'is_webp' => $is_webp,

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'uid' => false,

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

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$this->_queue[$queue_k] = $q;

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}

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

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}

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/**

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* Generate UCSS

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*

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* @since 4.0

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*

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* @param bool $keep_going Whether to continue processing.

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* @return mixed The cron handler result.

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*/

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public static function cron( $keep_going = false ) {

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$_instance = self::cls();

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return $_instance->_cron_handler( $keep_going );

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}

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/**

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* Handle UCSS cron

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*

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* @since 4.2

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*

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* @param bool $keep_going Whether to continue processing.

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* @return mixed The redirect result or void.

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*/

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private function _cron_handler( $keep_going ) {

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

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

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return;

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}

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// For cron, need to check request interval too

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if ( ! $keep_going ) {

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

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

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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'], $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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$this->_queue = $this->load_queue('ucss');

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

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

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if ( ! $keep_going ) {

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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 ), 'UCSS' );

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return Router::self_redirect( Router::ACTION_UCSS, self::TYPE_GEN );

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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 = $this->load_queue( 'ucss' );

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

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

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self::debug( 'Saved to queue [k] ' . $k );

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// only request first one

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if ( ! $keep_going ) {

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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), 'UCSS');

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return Router::self_redirect(Router::ACTION_UCSS, self::TYPE_GEN);

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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 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 The request URL.

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* @param string $queue_k The queue key.

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

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* @param string $user_agent The user agent.

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* @param string $vary The vary string.

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* @param string $url_tag The URL tag.

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* @param bool $is_mobile Whether is mobile.

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* @param bool $is_webp Whether supports webp.

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* @return string|bool|null The result status.

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*/

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private function _send_req( $request_url, $queue_k, $uid, $user_agent, $vary, $url_tag, $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_UCSS, $err);

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if (!$allowance) {

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self::debug('❌ 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'] = time();

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self::save_summary();

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// Gather guest HTML to send

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$html = $this->cls('CSS')->prepare_html($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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$css = false;

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list(, $html) = $this->prepare_css($html, $is_webp, true); // Use this to drop CSS from HTML as we don't need those CSS to generate UCSS

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

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

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

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self::debug('Checking combined file ' . $static_file);

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if (file_exists($static_file)) {

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$css = File::read($static_file);

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}

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if (!$css) {

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self::debug('❌ No combined css');

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return false;

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}

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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->_ucss_whitelist)) {

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

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}

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

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

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$json = Cloud::post(Cloud::SVC_UCSS, $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['ucss'])) {

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$this->_save_con('ucss', $json['ucss'], $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'] = time() - $this->_summary['curr_request'];

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$this->_summary['last_request'] = $this->_summary['curr_request'];

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$this->_summary['curr_request'] = 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 UCSS content

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*

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* @since 4.2

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*

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* @param string $type The content type.

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* @param string $css The CSS content.

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* @param string $queue_k The queue key.

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* @param bool $is_mobile Whether is mobile.

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* @param bool $is_webp Whether supports webp.

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*/

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private function _save_con( $type, $css, $queue_k, $is_mobile, $is_webp ) {

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// Add filters

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

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self::debug2('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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self::debug2("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), $is_mobile, $is_webp);

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

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}

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/**

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* Prepare CSS from HTML for CCSS generation only. UCSS will used 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 The HTML content.

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* @param bool $is_webp Whether supports webp.

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* @param bool $dryrun Whether to run in dry mode.

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* @return array Array of CSS and 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) {

[452] Fix | Delete

$debug_info = '';

[453] Fix | Delete

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

[454] Fix | Delete

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

[455] Fix | Delete

[456] Fix | Delete

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

[457] Fix | Delete

continue;

[458] Fix | Delete

}

[459] Fix | Delete

[460] Fix | Delete

if ( 'stylesheet' !== $attrs['rel'] ) {

[461] Fix | Delete

if ( 'preload' !== $attrs['rel'] || empty( $attrs['as'] ) || 'style' !== $attrs['as'] ) {

[462] Fix | Delete

continue;

[463] Fix | Delete

}

[464] Fix | Delete

}

[465] Fix | Delete

[466] Fix | Delete

if (!empty($attrs['media']) && strpos($attrs['media'], 'print') !== false) {

[467] Fix | Delete

continue;

[468] Fix | Delete

}

[469] Fix | Delete

[470] Fix | Delete

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

[471] Fix | Delete

continue;

[472] Fix | Delete

}

[473] Fix | Delete

[474] Fix | Delete

// Check Google fonts hit

[475] Fix | Delete

if (strpos($attrs['href'], 'fonts.googleapis.com') !== false) {

[476] Fix | Delete

$html = str_replace($match[0], '', $html);

[477] Fix | Delete

continue;

[478] Fix | Delete

}

[479] Fix | Delete

[480] Fix | Delete

$debug_info = $attrs['href'];

[481] Fix | Delete

[482] Fix | Delete

// Load CSS content

[483] Fix | Delete

if (!$dryrun) {

[484] Fix | Delete

// Dryrun will not load CSS but just drop them

[485] Fix | Delete

$con = $this->cls('Optimizer')->load_file($attrs['href']);

[486] Fix | Delete

if (!$con) {

[487] Fix | Delete

continue;

[488] Fix | Delete

}

[489] Fix | Delete

} else {

[490] Fix | Delete

$con = '';

[491] Fix | Delete

}

[492] Fix | Delete

} else {

[493] Fix | Delete

// Inline style

[494] Fix | Delete

$attrs = Utility::parse_attr($match[2]);

[495] Fix | Delete

[496] Fix | Delete

if (!empty($attrs['media']) && strpos($attrs['media'], 'print') !== false) {

[497] Fix | Delete

continue;

[498] Fix | Delete

}

[499] Fix | Delete