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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;
/**
* 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 ) == '*/' ) {
$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 );
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
$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;
foreach ( $this->_queue as $k => $v ) {
if ( ! empty( $v[ '_status' ] ) ) {
continue;
}
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';
}
set_time_limit( 120 );
// 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 );
$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();
}
}