initial commit

hamrokhaanpaan/wp-content/plugins/litespeed-cache/src/optimizer.cls.php

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+<?php
+/**
+ * The optimize4 class.
+ *
+ * @since      	1.9
+ * @package  	LiteSpeed
+ * @subpackage 	LiteSpeed/inc
+ * @author     	LiteSpeed Technologies <info@litespeedtech.com>
+ */
+namespace LiteSpeed;
+
+defined('WPINC') || exit();
+
+class Optimizer extends Root
+{
+	private $_conf_css_font_display;
+
+	/**
+	 * Init optimizer
+	 *
+	 * @since  1.9
+	 */
+	public function __construct()
+	{
+		$this->_conf_css_font_display = $this->conf(Base::O_OPTM_CSS_FONT_DISPLAY);
+	}
+
+	/**
+	 * Run HTML minify process and return final content
+	 *
+	 * @since  1.9
+	 * @access public
+	 */
+	public function html_min($content, $force_inline_minify = false)
+	{
+		if (!apply_filters('litespeed_html_min', true)) {
+			Debug2::debug2('[Optmer] html_min bypassed via litespeed_html_min filter');
+			return $content;
+		}
+
+		$options = array();
+
+		if ($force_inline_minify) {
+			$options['jsMinifier'] = __CLASS__ . '::minify_js';
+		}
+
+		/**
+		 * Added exception capture when minify
+		 * @since  2.2.3
+		 */
+		try {
+			$obj = new Lib\HTML_MIN($content, $options);
+			$content_final = $obj->process();
+			if (!defined('LSCACHE_ESI_SILENCE')) {
+				$content_final .= "\n" . '<!-- Page optimized by LiteSpeed Cache @' . date('Y-m-d H:i:s', time() + LITESPEED_TIME_OFFSET) . ' -->';
+			}
+			return $content_final;
+		} catch (\Exception $e) {
+			Debug2::debug('******[Optmer] html_min failed: ' . $e->getMessage());
+			error_log('****** LiteSpeed Optimizer html_min failed: ' . $e->getMessage());
+			return $content;
+		}
+	}
+
+	/**
+	 * Run minify process and save content
+	 *
+	 * @since  1.9
+	 * @access public
+	 */
+	public function serve($request_url, $file_type, $minify, $src_list)
+	{
+		// Try Unique CSS
+		if ($file_type == 'css') {
+			$content = false;
+			if (defined('LITESPEED_GUEST_OPTM') || $this->conf(Base::O_OPTM_UCSS)) {
+				$filename = $this->cls('UCSS')->load($request_url);
+
+				if ($filename) {
+					return array($filename, 'ucss');
+				}
+			}
+		}
+
+		// Before generated, don't know the contented hash filename yet, so used url hash as tmp filename
+		$file_path_prefix = $this->_build_filepath_prefix($file_type);
+
+		$url_tag = $request_url;
+		$url_tag_for_file = md5($request_url);
+		if (is_404()) {
+			$url_tag_for_file = $url_tag = '404';
+		} elseif ($file_type == 'css' && apply_filters('litespeed_ucss_per_pagetype', false)) {
+			$url_tag_for_file = $url_tag = Utility::page_type();
+		}
+
+		$static_file = LITESPEED_STATIC_DIR . $file_path_prefix . $url_tag_for_file . '.' . $file_type;
+
+		// Create tmp file to avoid conflict
+		$tmp_static_file = $static_file . '.tmp';
+		if (file_exists($tmp_static_file) && time() - filemtime($tmp_static_file) <= 600) {
+			// some other request is generating
+			return false;
+		}
+		// File::save( $tmp_static_file, '/* ' . ( is_404() ? '404' : $request_url ) . ' */', true ); // Can't use this bcos this will get filecon md5 changed
+		File::save($tmp_static_file, '', true);
+
+		// Load content
+		$real_files = array();
+		foreach ($src_list as $src_info) {
+			$is_min = false;
+			if (!empty($src_info['inl'])) {
+				// Load inline
+				$content = $src_info['src'];
+			} else {
+				// Load file
+				$content = $this->load_file($src_info['src'], $file_type);
+
+				if (!$content) {
+					continue;
+				}
+
+				$is_min = $this->is_min($src_info['src']);
+			}
+			$content = $this->optm_snippet($content, $file_type, $minify && !$is_min, $src_info['src'], !empty($src_info['media']) ? $src_info['media'] : false);
+			// Write to file
+			File::save($tmp_static_file, $content, true, true);
+		}
+
+		// validate md5
+		$filecon_md5 = md5_file($tmp_static_file);
+
+		$final_file_path = $file_path_prefix . $filecon_md5 . '.' . $file_type;
+		$realfile = LITESPEED_STATIC_DIR . $final_file_path;
+		if (!file_exists($realfile)) {
+			rename($tmp_static_file, $realfile);
+			Debug2::debug2('[Optmer] Saved static file [path] ' . $realfile);
+		} else {
+			unlink($tmp_static_file);
+		}
+
+		$vary = $this->cls('Vary')->finalize_full_varies();
+		Debug2::debug2("[Optmer] Save URL to file for [file_type] $file_type [file] $filecon_md5 [vary] $vary ");
+		$this->cls('Data')->save_url($url_tag, $vary, $file_type, $filecon_md5, dirname($realfile));
+
+		return array($filecon_md5 . '.' . $file_type, $file_type);
+	}
+
+	/**
+	 * Load a single file
+	 * @since  4.0
+	 */
+	public function optm_snippet($content, $file_type, $minify, $src, $media = false)
+	{
+		// CSS related features
+		if ($file_type == 'css') {
+			// Font optimize
+			if ($this->_conf_css_font_display) {
+				$content = preg_replace('#(@font\-face\s*\{)#isU', '${1}font-display:swap;', $content);
+			}
+
+			$content = preg_replace('/@charset[^;]+;\\s*/', '', $content);
+
+			if ($media) {
+				$content = '@media ' . $media . '{' . $content . "\n}";
+			}
+
+			if ($minify) {
+				$content = self::minify_css($content);
+			}
+
+			$content = $this->cls('CDN')->finalize($content);
+
+			if ((defined('LITESPEED_GUEST_OPTM') || $this->conf(Base::O_IMG_OPTM_WEBP)) && $this->cls('Media')->webp_support()) {
+				$content = $this->cls('Media')->replace_background_webp($content);
+			}
+		} else {
+			if ($minify) {
+				$content = self::minify_js($content);
+			} else {
+				$content = $this->_null_minifier($content);
+			}
+
+			$content .= "\n;";
+		}
+
+		// Add filter
+		$content = apply_filters('litespeed_optm_cssjs', $content, $file_type, $src);
+
+		return $content;
+	}
+
+	/**
+	 * Load remote resource from cache if existed
+	 *
+	 * @since  4.7
+	 */
+	private function load_cached_file($url, $file_type)
+	{
+		$file_path_prefix = $this->_build_filepath_prefix($file_type);
+		$folder_name = LITESPEED_STATIC_DIR . $file_path_prefix;
+		$to_be_deleted_folder = $folder_name . date('Ymd', strtotime('-2 days'));
+		if (file_exists($to_be_deleted_folder)) {
+			Debug2::debug('[Optimizer] ❌ Clearning folder [name] ' . $to_be_deleted_folder);
+			File::rrmdir($to_be_deleted_folder);
+		}
+
+		$today_file = $folder_name . date('Ymd') . '/' . md5($url);
+		if (file_exists($today_file)) {
+			return File::read($today_file);
+		}
+
+		// Write file
+		$res = wp_remote_get($url);
+		$res_code = wp_remote_retrieve_response_code($res);
+		if (is_wp_error($res) || $res_code != 200) {
+			Debug2::debug2('[Optimizer] ❌ Load Remote error [code] ' . $res_code);
+			return false;
+		}
+		$con = wp_remote_retrieve_body($res);
+		if (!$con) {
+			return false;
+		}
+
+		Debug2::debug('[Optimizer] ✅ Save remote file to cache [name] ' . $today_file);
+		File::save($today_file, $con, true);
+
+		return $con;
+	}
+
+	/**
+	 * Load remote/local resource
+	 *
+	 * @since  3.5
+	 */
+	public function load_file($src, $file_type = 'css')
+	{
+		$real_file = Utility::is_internal_file($src);
+		$postfix = pathinfo(parse_url($src, PHP_URL_PATH), PATHINFO_EXTENSION);
+		if (!$real_file || $postfix != $file_type) {
+			Debug2::debug2('[CSS] Load Remote [' . $file_type . '] ' . $src);
+			$this_url = substr($src, 0, 2) == '//' ? set_url_scheme($src) : $src;
+			$con = $this->load_cached_file($this_url, $file_type);
+
+			if ($file_type == 'css') {
+				$dirname = dirname($this_url) . '/';
+
+				$con = Lib\CSS_MIN\UriRewriter::prepend($con, $dirname);
+			}
+		} else {
+			Debug2::debug2('[CSS] Load local [' . $file_type . '] ' . $real_file[0]);
+			$con = File::read($real_file[0]);
+
+			if ($file_type == 'css') {
+				$dirname = dirname($real_file[0]);
+
+				$con = Lib\CSS_MIN\UriRewriter::rewrite($con, $dirname);
+			}
+		}
+
+		return $con;
+	}
+
+	/**
+	 * Minify CSS
+	 *
+	 * @since  2.2.3
+	 * @access private
+	 */
+	public static function minify_css($data)
+	{
+		try {
+			$obj = new Lib\CSS_MIN\Minifier();
+			return $obj->run($data);
+		} catch (\Exception $e) {
+			Debug2::debug('******[Optmer] minify_css failed: ' . $e->getMessage());
+			error_log('****** LiteSpeed Optimizer minify_css failed: ' . $e->getMessage());
+			return $data;
+		}
+	}
+
+	/**
+	 * Minify JS
+	 *
+	 * Added exception capture when minify
+	 *
+	 * @since  2.2.3
+	 * @access private
+	 */
+	public static function minify_js($data, $js_type = '')
+	{
+		// For inline JS optimize, need to check if it's js type
+		if ($js_type) {
+			preg_match('#type=([\'"])(.+)\g{1}#isU', $js_type, $matches);
+			if ($matches && $matches[2] != 'text/javascript') {
+				Debug2::debug('******[Optmer] minify_js bypass due to type: ' . $matches[2]);
+				return $data;
+			}
+		}
+
+		try {
+			$data = Lib\JSMin::minify($data);
+			return $data;
+		} catch (\Exception $e) {
+			Debug2::debug('******[Optmer] minify_js failed: ' . $e->getMessage());
+			// error_log( '****** LiteSpeed Optimizer minify_js failed: ' . $e->getMessage() );
+			return $data;
+		}
+	}
+
+	/**
+	 * Basic minifier
+	 *
+	 * @access private
+	 */
+	private function _null_minifier($content)
+	{
+		$content = str_replace("\r\n", "\n", $content);
+
+		return trim($content);
+	}
+
+	/**
+	 * Check if the file is already min file
+	 *
+	 * @since  1.9
+	 */
+	public function is_min($filename)
+	{
+		$basename = basename($filename);
+		if (preg_match('/[-\.]min\.(?:[a-zA-Z]+)$/i', $basename)) {
+			return true;
+		}
+
+		return false;
+	}
+}