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<?php
/**
* The ucss class.
*
* @since 5.1
*/
namespace LiteSpeed;
defined( 'WPINC' ) || exit;
class UCSS extends Base {
const LOG_TAG = '[UCSS]';
const TYPE_GEN = 'gen';
const TYPE_CLEAR_Q = 'clear_q';
protected $_summary;
private $_ucss_whitelist;
private $_queue;
/**
* Init
*
* @since 3.0
*/
public function __construct() {
$this->_summary = self::get_summary();
add_filter( 'litespeed_ucss_whitelist', array( $this->cls( 'Data' ), 'load_ucss_whitelist' ) );
}
/**
* Uniform url tag for ucss usage
* @since 4.7
*/
public static function get_url_tag( $request_url = false ) {
$url_tag = $request_url;
if ( is_404() ) {
$url_tag = '404';
}
elseif ( apply_filters( 'litespeed_ucss_per_pagetype', false ) ) {
$url_tag = Utility::page_type();
self::debug( 'litespeed_ucss_per_pagetype filter altered url to ' . $url_tag );
}
return $url_tag;
}
/**
* Get UCSS path
*
* @since 4.0
*/
public function load( $request_url, $dry_run = false ) {
// Check UCSS URI excludes
$ucss_exc = apply_filters( 'litespeed_ucss_exc', $this->conf( self::O_OPTM_UCSS_EXC ) );
if ( $ucss_exc && $hit = Utility::str_hit_array( $request_url, $ucss_exc ) ) {
self::debug( 'UCSS bypassed due to UCSS URI Exclude setting: ' . $hit );
return false;
}
$filepath_prefix = $this->_build_filepath_prefix( 'ucss' );
$url_tag = self::get_url_tag( $request_url );
$vary = $this->cls( 'Vary' )->finalize_full_varies();
$filename = $this->cls( 'Data' )->load_url_file( $url_tag, $vary, 'ucss' );
if ( $filename ) {
$static_file = LITESPEED_STATIC_DIR . $filepath_prefix . $filename . '.css';
if ( file_exists( $static_file ) ) {
self::debug2( 'existing ucss ' . $static_file );
// Check if is error comment inside only
$tmp = File::read( $static_file );
if ( substr( $tmp, 0, 2 ) == '/*' && substr( $tmp, -2 ) == '*/' ) {
self::debug2( 'existing ucss is error only: ' . $tmp );
return false;
}
return $filename . '.css';
}
}
if ( $dry_run ) {
return false;
}
$uid = get_current_user_id();
$ua = $this->_get_ua();
// Store it for cron
$this->_queue = $this->load_queue( 'ucss' );
if ( count( $this->_queue ) > 500 ) {
self::debug( 'UCSS Queue is full - 500' );
return false;
}
$queue_k = ( strlen( $vary ) > 32 ? md5( $vary ) : $vary ) . ' ' . $url_tag;
$this->_queue[ $queue_k ] = array(
'url' => apply_filters( 'litespeed_ucss_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( 'ucss', $this->_queue );
self::debug( 'Added queue_ucss [url_tag] ' . $url_tag . ' [UA] ' . $ua . ' [vary] ' . $vary . ' [uid] ' . $uid );
// Prepare cache tag for later purge
Tag::add( 'UCSS.' . md5( $queue_k ) );
return false;
}
/**
* Get User Agent
*
* @since 5.3
*/
private function _get_ua() {
return ! empty( $_SERVER[ 'HTTP_USER_AGENT' ] ) ? $_SERVER[ 'HTTP_USER_AGENT' ] : '';
}
/**
* Add rows to q
*
* @since 5.3
*/
public function add_to_q($url_files) {
// Store it for cron
$this->_queue = $this->load_queue( 'ucss' );
if ( count( $this->_queue ) > 500 ) {
self::debug( 'UCSS Queue is full - 500' );
return false;
}
$ua = $this->_get_ua();
foreach ( $url_files as $url_file ) {
$vary = $url_file[ 'vary' ];
$request_url = $url_file[ 'url' ];
$is_mobile = $url_file[ 'mobile' ];
$is_webp = $url_file[ 'webp' ];
$url_tag = self::get_url_tag( $request_url );
$queue_k = ( strlen( $vary ) > 32 ? md5( $vary ) : $vary ) . ' ' . $url_tag;
$q = array(
'url' => apply_filters( 'litespeed_ucss_url', $request_url ),
'user_agent' => substr( $ua, 0, 200 ),
'is_mobile' => $is_mobile,
'is_webp' => $is_webp,
'uid' => false,
'vary' => $vary,
'url_tag' => $url_tag,
); // Current UA will be used to request
self::debug( 'Added queue_ucss [url_tag] ' . $url_tag . ' [UA] ' . $ua . ' [vary] ' . $vary . ' [uid] false' );
$this->_queue[ $queue_k ] = $q;
}
$this->save_queue( 'ucss', $this->_queue );
}
/**
* Generate UCSS
*
* @since 4.0
*/
public static function cron( $continue = false ) {
$_instance = self::cls();
return $_instance->_cron_handler( $continue );
}
/**
* Handle UCSS cron
*
* @since 4.2
*/
private function _cron_handler( $continue ) {
$this->_queue = $this->load_queue( 'ucss' );
if ( empty( $this->_queue ) ) {
return;
}
// For cron, need to check request interval too
if ( ! $continue ) {
if ( ! empty( $this->_summary[ 'curr_request' ] ) && time() - $this->_summary[ 'curr_request' ] < 300 && ! $this->conf( self::O_DEBUG ) ) {
self::debug( 'Last request not done' );
return;
}
}
$i = 0;
foreach ( $this->_queue as $k => $v ) {
if ( ! empty( $v[ '_status' ] ) ) {
continue;
}
self::debug( 'cron job [tag] ' . $k . ' [url] ' . $v[ 'url' ] . ( $v[ 'is_mobile' ] ? ' 📱 ' : '' ) . ' [UA] ' . $v[ 'user_agent' ] );
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' ], $v[ 'is_mobile' ], $v[ 'is_webp' ] );
if ( ! $res ) { // Status is wrong, drop this this->_queue
$this->_queue = $this->load_queue( 'ucss' );
unset( $this->_queue[ $k ] );
$this->save_queue( 'ucss', $this->_queue );
if ( ! $continue ) {
return;
}
if ( $i > 3 ) {
GUI::print_loading( count( $this->_queue ), 'UCSS' );
return Router::self_redirect( Router::ACTION_UCSS, self::TYPE_GEN );
}
continue;
}
// Exit queue if out of quota
if ( $res === 'out_of_quota' ) {
return;
}
$this->_queue = $this->load_queue( 'ucss' );
$this->_queue[ $k ][ '_status' ] = 'requested';
$this->save_queue( 'ucss', $this->_queue );
self::debug( 'Saved to queue [k] ' . $k );
// only request first one
if ( ! $continue ) {
return;
}
if ( $i > 3 ) {
GUI::print_loading( count( $this->_queue ), 'UCSS' );
return Router::self_redirect( Router::ACTION_UCSS, self::TYPE_GEN );
}
}
}
/**
* Send to QC API to generate UCSS
*
* @since 2.3
* @access private
*/
private function _send_req( $request_url, $queue_k, $uid, $user_agent, $vary, $url_tag, $is_mobile, $is_webp ) {
// Check if has credit to push or not
$err = false;
$allowance = $this->cls( 'Cloud' )->allowance( Cloud::SVC_UCSS, $err );
if ( ! $allowance ) {
self::debug( '❌ 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' ] = time();
self::save_summary();
// Gather guest HTML to send
$html = $this->cls('CSS')->prepare_html( $request_url, $user_agent, $uid );
if ( ! $html ) {
return false;
}
// Parse HTML to gather all CSS content before requesting
$css = false;
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
$filename = $this->cls( 'Data' )->load_url_file( $url_tag, $vary, 'css' );
$filepath_prefix = $this->_build_filepath_prefix( 'css' );
$static_file = LITESPEED_STATIC_DIR . $filepath_prefix . $filename . '.css';
self::debug( 'Checking combined file ' . $static_file );
if ( file_exists( $static_file ) ) {
$css = File::read( $static_file );
}
if ( ! $css ) {
self::debug( '❌ No combined css' );
return false;
}
$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,
);
if ( ! isset( $this->_ucss_whitelist ) ) {
$this->_ucss_whitelist = $this->_filter_whitelist();
}
$data[ 'whitelist' ] = $this->_ucss_whitelist;
self::debug( 'Generating: ', $data );
$json = Cloud::post( Cloud::SVC_UCSS, $data, 30 );
if ( ! is_array( $json ) ) {
return false;
}
// Old version compatibility
if ( empty( $json[ 'status' ] ) ) {
if ( ! empty( $json[ 'ucss' ] ) ) {
$this->_save_con( 'ucss', $json[ 'ucss' ], $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' ] = time() - $this->_summary[ 'curr_request' ];
$this->_summary[ 'last_request' ] = $this->_summary[ 'curr_request' ];
$this->_summary[ 'curr_request' ] = 0;
self::save_summary();
return true;
}
/**
* Save UCSS content
*
* @since 4.2
*/
private function _save_con( $type, $css, $queue_k, $is_mobile, $is_webp ) {
// Add filters
$css = apply_filters( 'litespeed_' . $type, $css, $queue_k );
self::debug2( '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' ];
self::debug2( "Save URL to file [file] $static_file [vary] $vary" );
$this->cls( 'Data' )->save_url( $url_tag, $vary, $type, $filecon_md5, dirname( $static_file ), $is_mobile, $is_webp );
Purge::add( strtoupper( $type ) . '.' . md5( $queue_k ) );
}
/**
* 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 );
}
/**
* Filter the comment content, add quotes to selector from whitelist. Return the json
*
* @since 3.3
*/
private function _filter_whitelist() {
$whitelist = array();
$list = apply_filters( 'litespeed_ucss_whitelist', $this->conf( self::O_OPTM_UCSS_SELECTOR_WHITELIST ) );
foreach ( $list as $k => $v ) {
if ( substr( $v, 0, 2 ) === '//' ) {
continue;
}
// Wrap in quotes for selectors
if ( substr( $v, 0, 1 ) !== '/' && strpos( $v, '"' ) === false && strpos( $v, "'" ) === false ) {
// $v = "'$v'";
}
$whitelist[] = $v;
}
return $whitelist;
}
/**
* Notify finished from server
* @since 5.1
*/
public function notify() {
$post_data = json_decode(file_get_contents('php://input'), true);
if( is_null( $post_data ) ) {
$post_data = $_POST;
}
self::debug( 'notify() data', $post_data );
$this->_queue = $this->load_queue( 'ucss' );
// Validate key
if ( empty( $post_data[ 'domain_key' ] ) || $post_data[ 'domain_key' ] !== md5( $this->conf( self::O_API_KEY ) ) ) {
self::debug( '❌ notify wrong key' );
self::save_summary( array( 'notify_ts_err' => time() ) );
return Cloud::err( 'wrong_key' );
}
list( $post_data ) = $this->cls( 'Cloud' )->extract_msg( $post_data, 'ucss' );
$notified_data = $post_data[ 'data' ];
if ( empty( $notified_data ) || ! is_array( $notified_data ) ) {
self::debug( '❌ notify exit: no notified data' );
return Cloud::err( 'no notified data' );
}
// Check if its in queue or not
$valid_i = 0;
foreach ( $notified_data as $v ) {
if ( empty( $v[ 'request_url' ] ) ) {
self::debug( '❌ notify bypass: no request_url', $v );
continue;
}
if ( empty( $v[ 'queue_k' ] ) ) {
self::debug( '❌ notify bypass: no queue_k', $v );
continue;
}
if ( empty( $this->_queue[ $v[ 'queue_k' ] ] ) ) {
self::debug( '❌ notify bypass: no this queue [q_k]' . $v[ 'queue_k' ] );
continue;
}
// Save data
if ( ! empty( $v[ 'data_ucss' ] ) ) {
$is_mobile = $this->_queue[ $v[ 'queue_k' ] ][ 'is_mobile' ];
$is_webp = $this->_queue[ $v[ 'queue_k' ] ][ 'is_webp' ];
$this->_save_con( 'ucss', $v[ 'data_ucss' ], $v[ 'queue_k' ], $is_mobile, $is_webp );
$valid_i ++;
}
unset( $this->_queue[ $v[ 'queue_k' ] ] );
self::debug( 'notify data handled, unset queue [q_k] ' . $v[ 'queue_k' ] );
}
$this->save_queue( 'ucss', $this->_queue );
self::debug( 'notified' );
return Cloud::ok( array( 'count' => $valid_i ) );
}
/**
* 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:
self::cron( true );
break;
case self::TYPE_CLEAR_Q:
$this->clear_q( 'ucss' );
break;
default:
break;
}
Admin::redirect();
}
}