<?php

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// phpcs:ignoreFile

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/**

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* The optimize4 class.

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*

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* @since 1.9

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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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class Optimizer extends Root {

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private $_conf_css_font_display;

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/**

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* Init optimizer

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*

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* @since 1.9

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*/

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public function __construct() {

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$this->_conf_css_font_display = $this->conf(Base::O_OPTM_CSS_FONT_DISPLAY);

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}

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/**

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* Run HTML minify process and return final content

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*

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* @since 1.9

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* @access public

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*/

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public function html_min( $content, $force_inline_minify = false ) {

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if (!apply_filters('litespeed_html_min', true)) {

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Debug2::debug2('[Optmer] html_min bypassed via litespeed_html_min filter');

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return $content;

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}

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$options = array();

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if ($force_inline_minify) {

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$options['jsMinifier'] = __CLASS__ . '::minify_js';

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}

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$skip_comments = $this->conf(Base::O_OPTM_HTML_SKIP_COMMENTS);

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if ($skip_comments) {

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$options['skipComments'] = $skip_comments;

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}

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/**

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* Added exception capture when minify

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*

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* @since 2.2.3

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*/

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try {

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$obj = new Lib\HTML_MIN($content, $options);

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$content_final = $obj->process();

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// check if content from minification is empty

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if ($content_final == '') {

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Debug2::debug('Failed to minify HTML: HTML minification resulted in empty HTML');

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return $content;

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}

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if (!defined('LSCACHE_ESI_SILENCE')) {

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$content_final .= "\n" . '<!-- Page optimized by LiteSpeed Cache @' . date('Y-m-d H:i:s', time() + LITESPEED_TIME_OFFSET) . ' -->';

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}

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return $content_final;

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} catch (\Exception $e) {

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Debug2::debug('******[Optmer] html_min failed: ' . $e->getMessage());

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error_log('****** LiteSpeed Optimizer html_min failed: ' . $e->getMessage());

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return $content;

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}

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}

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/**

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* Run minify process and save content

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*

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* @since 1.9

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* @access public

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*/

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public function serve( $request_url, $file_type, $minify, $src_list ) {

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// Try Unique CSS

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if ($file_type == 'css') {

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$content = false;

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if (defined('LITESPEED_GUEST_OPTM') || $this->conf(Base::O_OPTM_UCSS)) {

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$filename = $this->cls('UCSS')->load($request_url);

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if ($filename) {

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return array( $filename, 'ucss' );

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}

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}

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}

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// Before generated, don't know the contented hash filename yet, so used url hash as tmp filename

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$file_path_prefix = $this->_build_filepath_prefix($file_type);

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$url_tag = $request_url;

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$url_tag_for_file = md5($request_url);

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if (is_404()) {

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$url_tag_for_file = $url_tag = '404';

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} elseif ($file_type == 'css' && apply_filters('litespeed_ucss_per_pagetype', false)) {

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$url_tag_for_file = $url_tag = Utility::page_type();

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}

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$static_file = LITESPEED_STATIC_DIR . $file_path_prefix . $url_tag_for_file . '.' . $file_type;

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// Create tmp file to avoid conflict

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$tmp_static_file = $static_file . '.tmp';

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if (file_exists($tmp_static_file) && time() - filemtime($tmp_static_file) <= 600) {

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// some other request is generating

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return false;

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}

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// File::save( $tmp_static_file, '/* ' . ( is_404() ? '404' : $request_url ) . ' */', true ); // Can't use this bcos this will get filecon md5 changed

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File::save($tmp_static_file, '', true);

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// Load content

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$real_files = array();

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foreach ($src_list as $src_info) {

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$is_min = false;

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if (!empty($src_info['inl'])) {

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// Load inline

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$content = $src_info['src'];

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} else {

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// Load file

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$content = $this->load_file($src_info['src'], $file_type);

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if (!$content) {

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continue;

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}

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$is_min = $this->is_min($src_info['src']);

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}

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$content = $this->optm_snippet($content, $file_type, $minify && !$is_min, $src_info['src'], !empty($src_info['media']) ? $src_info['media'] : false);

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// Write to file

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File::save($tmp_static_file, $content, true, true);

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}

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// if CSS - run the minification on the saved file.

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// Will move imports to the top of file and remove extra spaces.

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if ($file_type == 'css') {

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$obj = new Lib\CSS_JS_MIN\Minify\CSS();

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$file_content_combined = $obj->moveImportsToTop(File::read($tmp_static_file));

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File::save($tmp_static_file, $file_content_combined);

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}

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// validate md5

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$filecon_md5 = md5_file($tmp_static_file);

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$final_file_path = $file_path_prefix . $filecon_md5 . '.' . $file_type;

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$realfile = LITESPEED_STATIC_DIR . $final_file_path;

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if (!file_exists($realfile)) {

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rename($tmp_static_file, $realfile);

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Debug2::debug2('[Optmer] Saved static file [path] ' . $realfile);

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} else {

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unlink($tmp_static_file);

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}

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$vary = $this->cls('Vary')->finalize_full_varies();

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Debug2::debug2("[Optmer] Save URL to file for [file_type] $file_type [file] $filecon_md5 [vary] $vary ");

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$this->cls('Data')->save_url($url_tag, $vary, $file_type, $filecon_md5, dirname($realfile));

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return array( $filecon_md5 . '.' . $file_type, $file_type );

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}

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/**

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* Load a single file

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*

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* @since 4.0

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*/

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public function optm_snippet( $content, $file_type, $minify, $src, $media = false ) {

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// CSS related features

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if ($file_type == 'css') {

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// Font optimize

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if ($this->_conf_css_font_display) {

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$content = preg_replace('#(@font\-face\s*\{)#isU', '${1}font-display:swap;', $content);

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}

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$content = preg_replace('/@charset[^;]+;\\s*/', '', $content);

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if ($media) {

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$content = '@media ' . $media . '{' . $content . "\n}";

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}

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if ($minify) {

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$content = self::minify_css($content);

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}

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$content = $this->cls('CDN')->finalize($content);

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if ((defined('LITESPEED_GUEST_OPTM') || $this->conf(Base::O_IMG_OPTM_WEBP)) && $this->cls('Media')->webp_support()) {

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$content = $this->cls('Media')->replace_background_webp($content);

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}

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} else {

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if ($minify) {

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$content = self::minify_js($content);

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} else {

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$content = $this->_null_minifier($content);

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}

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$content .= "\n;";

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}

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// Add filter

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$content = apply_filters('litespeed_optm_cssjs', $content, $file_type, $src);

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return $content;

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}

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/**

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* Load remote resource from cache if existed

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*

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* @since 4.7

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*/

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private function load_cached_file( $url, $file_type ) {

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$file_path_prefix = $this->_build_filepath_prefix($file_type);

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$folder_name = LITESPEED_STATIC_DIR . $file_path_prefix;

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$to_be_deleted_folder = $folder_name . date('Ymd', strtotime('-2 days'));

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if (file_exists($to_be_deleted_folder)) {

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Debug2::debug('[Optimizer] ❌ Clearing folder [name] ' . $to_be_deleted_folder);

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File::rrmdir($to_be_deleted_folder);

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}

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$today_file = $folder_name . date('Ymd') . '/' . md5($url);

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if (file_exists($today_file)) {

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return File::read($today_file);

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}

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// Write file

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$res = wp_safe_remote_get($url);

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$res_code = wp_remote_retrieve_response_code($res);

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if (is_wp_error($res) || $res_code != 200) {

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Debug2::debug2('[Optimizer] ❌ Load Remote error [code] ' . $res_code);

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return false;

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}

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$con = wp_remote_retrieve_body($res);

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if (!$con) {

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return false;

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}

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Debug2::debug('[Optimizer] ✅ Save remote file to cache [name] ' . $today_file);

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File::save($today_file, $con, true);

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return $con;

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}

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/**

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* Load remote/local resource

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*

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* @since 3.5

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*/

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public function load_file( $src, $file_type = 'css' ) {

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$real_file = Utility::is_internal_file($src);

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$postfix = pathinfo(parse_url($src, PHP_URL_PATH), PATHINFO_EXTENSION);

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if (!$real_file || $postfix != $file_type) {

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Debug2::debug2('[CSS] Load Remote [' . $file_type . '] ' . $src);

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$this_url = substr($src, 0, 2) == '//' ? set_url_scheme($src) : $src;

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$con = $this->load_cached_file($this_url, $file_type);

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if ($file_type == 'css') {

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$dirname = dirname($this_url) . '/';

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$con = Lib\UriRewriter::prepend($con, $dirname);

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}

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} else {

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Debug2::debug2('[CSS] Load local [' . $file_type . '] ' . $real_file[0]);

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$con = File::read($real_file[0]);

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if ($file_type == 'css') {

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$dirname = dirname($real_file[0]);

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$con = Lib\UriRewriter::rewrite($con, $dirname);

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}

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}

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return $con;

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}

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/**

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* Minify CSS

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*

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* @since 2.2.3

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* @access private

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*/

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public static function minify_css( $data ) {

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try {

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$obj = new Lib\CSS_JS_MIN\Minify\CSS();

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$obj->add($data);

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return $obj->minify();

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} catch (\Exception $e) {

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Debug2::debug('******[Optmer] minify_css failed: ' . $e->getMessage());

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error_log('****** LiteSpeed Optimizer minify_css failed: ' . $e->getMessage());

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return $data;

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}

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}

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/**

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* Minify JS

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*

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* Added exception capture when minify

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*

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* @since 2.2.3

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* @access private

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*/

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public static function minify_js( $data, $js_type = '' ) {

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// For inline JS optimize, need to check if it's js type

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if ($js_type) {

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preg_match('#type=([\'"])(.+)\g{1}#isU', $js_type, $matches);

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if ($matches && $matches[2] != 'text/javascript') {

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Debug2::debug('******[Optmer] minify_js bypass due to type: ' . $matches[2]);

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return $data;

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}

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}

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try {

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$obj = new Lib\CSS_JS_MIN\Minify\JS();

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$obj->add($data);

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return $obj->minify();

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} catch (\Exception $e) {

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Debug2::debug('******[Optmer] minify_js failed: ' . $e->getMessage());

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// error_log( '****** LiteSpeed Optimizer minify_js failed: ' . $e->getMessage() );

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return $data;

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}

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}

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/**

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* Basic minifier

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*

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* @access private

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*/

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private function _null_minifier( $content ) {

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$content = str_replace("\r\n", "\n", $content);

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return trim($content);

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}

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/**

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* Check if the file is already min file

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*

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* @since 1.9

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*/

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public function is_min( $filename ) {

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$basename = basename($filename);

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if (preg_match('/[-\.]min\.(?:[a-zA-Z]+)$/i', $basename)) {

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return true;

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}

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return false;

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}

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}

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