<?php

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/**

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* The optimize css class.

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*

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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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class CSS extends Base

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{

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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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protected $_summary;

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private $_queue;

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private $_endts;

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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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{

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

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}

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/**

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* HTML lazyload CSS

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* @since 4.0

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*/

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public function prepare_html_lazy()

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{

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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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*/

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public function prepare_ccss()

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{

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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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*/

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private function _gen_ccss_file_tag($request_url)

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{

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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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if ($sep_uri && ($hit = Utility::str_hit_array($request_url, $sep_uri))) {

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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)) {

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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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*/

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private function _ccss()

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{

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global $wp;

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

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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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$ua = !empty($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';

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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] = array(

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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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// For v4.1- clean up

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if (isset($this->_summary['ccss_type_history']) || isset($this->_summary['ccss_history']) || isset($this->_summary['queue_ccss'])) {

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if (isset($this->_summary['ccss_type_history'])) {

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unset($this->_summary['ccss_type_history']);

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}

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if (isset($this->_summary['ccss_history'])) {

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unset($this->_summary['ccss_history']);

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}

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if (isset($this->_summary['queue_ccss'])) {

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unset($this->_summary['queue_ccss']);

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}

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self::save_summary();

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}

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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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public static function cron_ccss($continue = false)

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{

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$_instance = self::cls();

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return $_instance->_cron_handler('ccss', $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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private function _cron_handler($type, $continue)

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{

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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 (!$continue) {

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if (!empty($this->_summary['curr_request_' . $type]) && time() - $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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$timeoutLimit = ini_get('max_execution_time');

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$this->_endts = time() + $timeoutLimit;

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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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if (function_exists('set_time_limit')) {

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$this->_endts += 120;

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set_time_limit(120);

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}

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if ($this->_endts - time() < 10) {

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// self::debug("🚨 End loop due to timeout limit reached " . $timeoutLimit . "s");

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// return;

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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 ($type == 'ccss' && empty($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 (!$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, CSS::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

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

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

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{

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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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// 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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Debug2::debug('[UCSS] ❌ 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 = array(

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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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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 false;

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

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

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{

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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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public function test_url($request_url)

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{

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$user_agent = $_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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// var_dump( $css );

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// $html = <<<EOT

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// EOT;

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// $css = <<<EOT

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// EOT;

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$data = array(

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

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

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

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{

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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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/**

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

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{

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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'])) {

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continue;

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}

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

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

[463] Fix | Delete

continue;

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}

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}

[466] Fix | Delete

[467] Fix | Delete

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

[468] Fix | Delete

continue;

[469] Fix | Delete

}

[470] Fix | Delete

[471] Fix | Delete

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

[472] Fix | Delete

continue;

[473] Fix | Delete

}

[474] Fix | Delete

[475] Fix | Delete

// Check Google fonts hit

[476] Fix | Delete

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

[477] Fix | Delete

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

[478] Fix | Delete

continue;

[479] Fix | Delete

}

[480] Fix | Delete

[481] Fix | Delete

$debug_info = $attrs['href'];

[482] Fix | Delete

[483] Fix | Delete

// Load CSS content

[484] Fix | Delete

if (!$dryrun) {

[485] Fix | Delete

// Dryrun will not load CSS but just drop them

[486] Fix | Delete

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

[487] Fix | Delete

if (!$con) {

[488] Fix | Delete

continue;

[489] Fix | Delete

}

[490] Fix | Delete

} else {

[491] Fix | Delete

$con = '';

[492] Fix | Delete

}

[493] Fix | Delete

} else {

[494] Fix | Delete

// Inline style

[495] Fix | Delete

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

[496] Fix | Delete

[497] Fix | Delete

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

[498] Fix | Delete

continue;

[499] Fix | Delete