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<?php
/**
* The optimize css class.
*
* @since 2.3
*/
namespace LiteSpeed;
defined('WPINC') || exit();
class CSS extends Base
{
const LOG_TAG = '[CSS]';
const TYPE_GEN_CCSS = 'gen_ccss';
const TYPE_CLEAR_Q_CCSS = 'clear_q_ccss';
protected $_summary;
private $_queue;
private $_endts;
/**
* Init
*
* @since 3.0
*/
public function __construct()
{
$this->_summary = self::get_summary();
}
/**
* HTML lazyload CSS
* @since 4.0
*/
public function prepare_html_lazy()
{
return '<style>' . implode(',', $this->conf(self::O_OPTM_HTML_LAZY)) . '{content-visibility:auto;contain-intrinsic-size:1px 1000px;}</style>';
}
/**
* Output critical css
*
* @since 1.3
* @access public
*/
public function prepare_ccss()
{
// Get critical css for current page
// Note: need to consider mobile
$rules = $this->_ccss();
if (!$rules) {
return null;
}
$error_tag = '';
if (substr($rules, 0, 2) == '/*' && substr($rules, -2) == '*/') {
Core::comment('QUIC.cloud CCSS bypassed due to generation error ❌');
$error_tag = ' data-error="failed to generate"';
}
// Append default critical css
$rules .= $this->conf(self::O_OPTM_CCSS_CON);
return '<style id="litespeed-ccss"' . $error_tag . '>' . $rules . '</style>';
}
/**
* Generate CCSS url tag
*
* @since 4.0
*/
private function _gen_ccss_file_tag($request_url)
{
if (is_404()) {
return '404';
}
if ($this->conf(self::O_OPTM_CCSS_PER_URL)) {
return $request_url;
}
$sep_uri = $this->conf(self::O_OPTM_CCSS_SEP_URI);
if ($sep_uri && ($hit = Utility::str_hit_array($request_url, $sep_uri))) {
Debug2::debug('[CCSS] Separate CCSS due to separate URI setting: ' . $hit);
return $request_url;
}
$pt = Utility::page_type();
$sep_pt = $this->conf(self::O_OPTM_CCSS_SEP_POSTTYPE);
if (in_array($pt, $sep_pt)) {
Debug2::debug('[CCSS] Separate CCSS due to posttype setting: ' . $pt);
return $request_url;
}
// Per posttype
return $pt;
}
/**
* The critical css content of the current page
*
* @since 2.3
*/
private function _ccss()
{
global $wp;
$request_url = home_url($wp->request);
$filepath_prefix = $this->_build_filepath_prefix('ccss');
$url_tag = $this->_gen_ccss_file_tag($request_url);
$vary = $this->cls('Vary')->finalize_full_varies();
$filename = $this->cls('Data')->load_url_file($url_tag, $vary, 'ccss');
if ($filename) {
$static_file = LITESPEED_STATIC_DIR . $filepath_prefix . $filename . '.css';
if (file_exists($static_file)) {
Debug2::debug2('[CSS] existing ccss ' . $static_file);
Core::comment('QUIC.cloud CCSS loaded ✅ ' . $filepath_prefix . $filename . '.css');
return File::read($static_file);
}
}
$uid = get_current_user_id();
$ua = !empty($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';
// Store it to prepare for cron
Core::comment('QUIC.cloud CCSS in queue');
$this->_queue = $this->load_queue('ccss');
if (count($this->_queue) > 500) {
self::debug('CCSS Queue is full - 500');
return null;
}
$queue_k = (strlen($vary) > 32 ? md5($vary) : $vary) . ' ' . $url_tag;
$this->_queue[$queue_k] = array(
'url' => apply_filters('litespeed_ccss_url', $request_url),
'user_agent' => substr($ua, 0, 200),
'is_mobile' => $this->_separate_mobile(),
'is_webp' => $this->cls('Media')->webp_support() ? 1 : 0,
'uid' => $uid,
'vary' => $vary,
'url_tag' => $url_tag,
); // Current UA will be used to request
$this->save_queue('ccss', $this->_queue);
self::debug('Added queue_ccss [url_tag] ' . $url_tag . ' [UA] ' . $ua . ' [vary] ' . $vary . ' [uid] ' . $uid);
// Prepare cache tag for later purge
Tag::add('CCSS.' . md5($queue_k));
// For v4.1- clean up
if (isset($this->_summary['ccss_type_history']) || isset($this->_summary['ccss_history']) || isset($this->_summary['queue_ccss'])) {
if (isset($this->_summary['ccss_type_history'])) {
unset($this->_summary['ccss_type_history']);
}
if (isset($this->_summary['ccss_history'])) {
unset($this->_summary['ccss_history']);
}
if (isset($this->_summary['queue_ccss'])) {
unset($this->_summary['queue_ccss']);
}
self::save_summary();
}
return null;
}
/**
* Cron ccss generation
*
* @since 2.3
* @access private
*/
public static function cron_ccss($continue = false)
{
$_instance = self::cls();
return $_instance->_cron_handler('ccss', $continue);
}
/**
* Handle UCSS/CCSS cron
*
* @since 4.2
*/
private function _cron_handler($type, $continue)
{
$this->_queue = $this->load_queue($type);
if (empty($this->_queue)) {
return;
}
$type_tag = strtoupper($type);
// For cron, need to check request interval too
if (!$continue) {
if (!empty($this->_summary['curr_request_' . $type]) && time() - $this->_summary['curr_request_' . $type] < 300 && !$this->conf(self::O_DEBUG)) {
Debug2::debug('[' . $type_tag . '] Last request not done');
return;
}
}
$i = 0;
$timeoutLimit = ini_get('max_execution_time');
$this->_endts = time() + $timeoutLimit;
foreach ($this->_queue as $k => $v) {
if (!empty($v['_status'])) {
continue;
}
if (function_exists('set_time_limit')) {
$this->_endts += 120;
set_time_limit(120);
}
if ($this->_endts - time() < 10) {
// self::debug("🚨 End loop due to timeout limit reached " . $timeoutLimit . "s");
// return;
}
Debug2::debug('[' . $type_tag . '] cron job [tag] ' . $k . ' [url] ' . $v['url'] . ($v['is_mobile'] ? ' 📱 ' : '') . ' [UA] ' . $v['user_agent']);
if ($type == 'ccss' && empty($v['url_tag'])) {
unset($this->_queue[$k]);
$this->save_queue($type, $this->_queue);
Debug2::debug('[CCSS] wrong queue_ccss format');
continue;
}
if (!isset($v['is_webp'])) {
$v['is_webp'] = false;
}
$i++;
$res = $this->_send_req($v['url'], $k, $v['uid'], $v['user_agent'], $v['vary'], $v['url_tag'], $type, $v['is_mobile'], $v['is_webp']);
if (!$res) {
// Status is wrong, drop this this->_queue
unset($this->_queue[$k]);
$this->save_queue($type, $this->_queue);
if (!$continue) {
return;
}
if ($i > 3) {
GUI::print_loading(count($this->_queue), $type_tag);
return Router::self_redirect(Router::ACTION_CSS, CSS::TYPE_GEN_CCSS);
}
continue;
}
// Exit queue if out of quota
if ($res === 'out_of_quota') {
return;
}
$this->_queue[$k]['_status'] = 'requested';
$this->save_queue($type, $this->_queue);
// only request first one
if (!$continue) {
return;
}
if ($i > 3) {
GUI::print_loading(count($this->_queue), $type_tag);
return Router::self_redirect(Router::ACTION_CSS, CSS::TYPE_GEN_CCSS);
}
}
}
/**
* Send to QC API to generate CCSS/UCSS
*
* @since 2.3
* @access private
*/
private function _send_req($request_url, $queue_k, $uid, $user_agent, $vary, $url_tag, $type, $is_mobile, $is_webp)
{
// Check if has credit to push or not
$err = false;
$allowance = $this->cls('Cloud')->allowance(Cloud::SVC_CCSS, $err);
if (!$allowance) {
Debug2::debug('[CCSS] ❌ No credit: ' . $err);
$err && Admin_Display::error(Error::msg($err));
return 'out_of_quota';
}
// Update css request status
$this->_summary['curr_request_' . $type] = time();
self::save_summary();
// Gather guest HTML to send
$html = $this->prepare_html($request_url, $user_agent, $uid);
if (!$html) {
return false;
}
// Parse HTML to gather all CSS content before requesting
list($css, $html) = $this->prepare_css($html, $is_webp);
if (!$css) {
Debug2::debug('[UCSS] ❌ No combined css');
return false;
}
// Generate critical css
$data = array(
'url' => $request_url,
'queue_k' => $queue_k,
'user_agent' => $user_agent,
'is_mobile' => $is_mobile ? 1 : 0, // todo:compatible w/ tablet
'is_webp' => $is_webp ? 1 : 0,
'html' => $html,
'css' => $css,
);
self::debug('Generating: ', $data);
$json = Cloud::post(Cloud::SVC_CCSS, $data, 30);
if (!is_array($json)) {
return false;
}
// Old version compatibility
if (empty($json['status'])) {
if (!empty($json[$type])) {
$this->_save_con($type, $json[$type], $queue_k, $is_mobile, $is_webp);
}
// Delete the row
return false;
}
// Unknown status, remove this line
if ($json['status'] != 'queued') {
return false;
}
// Save summary data
$this->_summary['last_spent_' . $type] = time() - $this->_summary['curr_request_' . $type];
$this->_summary['last_request_' . $type] = $this->_summary['curr_request_' . $type];
$this->_summary['curr_request_' . $type] = 0;
self::save_summary();
return true;
}
/**
* Save CCSS/UCSS content
*
* @since 4.2
*/
private function _save_con($type, $css, $queue_k, $mobile, $webp)
{
// Add filters
$css = apply_filters('litespeed_' . $type, $css, $queue_k);
Debug2::debug2('[CSS] con: ' . $css);
if (substr($css, 0, 2) == '/*' && substr($css, -2) == '*/') {
self::debug('❌ empty ' . $type . ' [content] ' . $css);
// continue; // Save the error info too
}
// Write to file
$filecon_md5 = md5($css);
$filepath_prefix = $this->_build_filepath_prefix($type);
$static_file = LITESPEED_STATIC_DIR . $filepath_prefix . $filecon_md5 . '.css';
File::save($static_file, $css, true);
$url_tag = $this->_queue[$queue_k]['url_tag'];
$vary = $this->_queue[$queue_k]['vary'];
Debug2::debug2("[CSS] Save URL to file [file] $static_file [vary] $vary");
$this->cls('Data')->save_url($url_tag, $vary, $type, $filecon_md5, dirname($static_file), $mobile, $webp);
Purge::add(strtoupper($type) . '.' . md5($queue_k));
}
/**
* Play for fun
*
* @since 3.4.3
*/
public function test_url($request_url)
{
$user_agent = $_SERVER['HTTP_USER_AGENT'];
$html = $this->prepare_html($request_url, $user_agent);
list($css, $html) = $this->prepare_css($html, true, true);
// var_dump( $css );
// $html = <<<EOT
// EOT;
// $css = <<<EOT
// EOT;
$data = array(
'url' => $request_url,
'ccss_type' => 'test',
'user_agent' => $user_agent,
'is_mobile' => 0,
'html' => $html,
'css' => $css,
'type' => 'CCSS',
);
// self::debug( 'Generating: ', $data );
$json = Cloud::post(Cloud::SVC_CCSS, $data, 180);
var_dump($json);
}
/**
* Prepare HTML from URL
*
* @since 3.4.3
*/
public function prepare_html($request_url, $user_agent, $uid = false)
{
$html = $this->cls('Crawler')->self_curl(add_query_arg('LSCWP_CTRL', 'before_optm', $request_url), $user_agent, $uid);
Debug2::debug2('[CSS] self_curl result....', $html);
if (!$html) {
return false;
}
$html = $this->cls('Optimizer')->html_min($html, true);
// Drop <noscript>xxx</noscript>
$html = preg_replace('#<noscript>.*</noscript>#isU', '', $html);
return $html;
}
/**
* Prepare CSS from HTML for CCSS generation only. UCSS will used combined CSS directly.
* Prepare refined HTML for both CCSS and UCSS.
*
* @since 3.4.3
*/
public function prepare_css($html, $is_webp = false, $dryrun = false)
{
$css = '';
preg_match_all('#<link ([^>]+)/?>|<style([^>]*)>([^<]+)</style>#isU', $html, $matches, PREG_SET_ORDER);
foreach ($matches as $match) {
$debug_info = '';
if (strpos($match[0], '<link') === 0) {
$attrs = Utility::parse_attr($match[1]);
if (empty($attrs['rel'])) {
continue;
}
if ($attrs['rel'] != 'stylesheet') {
if ($attrs['rel'] != 'preload' || empty($attrs['as']) || $attrs['as'] != 'style') {
continue;
}
}
if (!empty($attrs['media']) && strpos($attrs['media'], 'print') !== false) {
continue;
}
if (empty($attrs['href'])) {
continue;
}
// Check Google fonts hit
if (strpos($attrs['href'], 'fonts.googleapis.com') !== false) {
$html = str_replace($match[0], '', $html);
continue;
}
$debug_info = $attrs['href'];
// Load CSS content
if (!$dryrun) {
// Dryrun will not load CSS but just drop them
$con = $this->cls('Optimizer')->load_file($attrs['href']);
if (!$con) {
continue;
}
} else {
$con = '';
}
} else {
// Inline style
$attrs = Utility::parse_attr($match[2]);
if (!empty($attrs['media']) && strpos($attrs['media'], 'print') !== false) {
continue;
}
Debug2::debug2('[CSS] Load inline CSS ' . substr($match[3], 0, 100) . '...', $attrs);
$con = $match[3];
$debug_info = '__INLINE__';
}
$con = Optimizer::minify_css($con);
if ($is_webp && $this->cls('Media')->webp_support()) {
$con = $this->cls('Media')->replace_background_webp($con);
}
if (!empty($attrs['media']) && $attrs['media'] !== 'all') {
$con = '@media ' . $attrs['media'] . '{' . $con . "}\n";
} else {
$con = $con . "\n";
}
$con = '/* ' . $debug_info . ' */' . $con;
$css .= $con;
$html = str_replace($match[0], '', $html);
}
return array($css, $html);
}
/**
* Handle all request actions from main cls
*
* @since 2.3
* @access public
*/
public function handler()
{
$type = Router::verify_type();
switch ($type) {
case self::TYPE_GEN_CCSS:
self::cron_ccss(true);
break;
case self::TYPE_CLEAR_Q_CCSS:
$this->clear_q('ccss');
break;
default:
break;
}
Admin::redirect();
}
}