457 lines
13 KiB
PHP
457 lines
13 KiB
PHP
<?php
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if (!defined('WPO_VERSION')) die('No direct access allowed');
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if (!class_exists('WP_Optimize_WebP')) :
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class WP_Optimize_WebP {
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private $_htaccess = null;
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/**
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* Set to true when webp is enabled and vice-versa
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*
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* @var boolean
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*/
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private $_should_use_webp = false;
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/**
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* Constructor
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*/
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private function __construct() {
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$this->_should_use_webp = (bool) WP_Optimize()->get_options()->get_option('webp_conversion');
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if ($this->_should_use_webp && $this->get_webp_conversion_test_result()) {
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if (!is_admin()) {
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// Allow filters added in theme files to run
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add_action('after_setup_theme', array($this, 'maybe_decide_webp_serve_method'));
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}
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}
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add_action('wpo_reset_webp_conversion_test_result', array($this, 'reset_webp_serving_method'));
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}
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/**
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* Returns singleton instance
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*
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* @return WP_Optimize_WebP
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*/
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public static function get_instance() {
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static $instance = null;
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if (null === $instance) {
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$instance = new WP_Optimize_WebP();
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}
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return $instance;
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}
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/**
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* Test Run and find converter status
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*/
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private function set_converter_status() {
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$converter_status = WPO_WebP_Test_Run::get_converter_status();
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if ($this->is_webp_conversion_successful()) {
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WP_Optimize()->get_options()->update_option('webp_conversion_test', true);
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WP_Optimize()->get_options()->update_option('webp_converters', $converter_status['working_converters']);
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}
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}
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/**
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* If .htaccess redirection is not possible, attempts to use the alter_html method
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*/
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public function maybe_decide_webp_serve_method() {
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if (!$this->is_webp_redirection_possible()) {
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$this->maybe_use_alter_html();
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}
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}
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/**
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* If alter html method is possible, then use it
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*/
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private function maybe_use_alter_html() {
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if ($this->is_alter_html_possible()) {
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$this->empty_htaccess_file();
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$this->use_alter_html();
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}
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}
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/**
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* Even if server support .htaccess rewrite, sometimes it is not possible
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* to serve webp images. So, find it webp redirection is possible or not
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* Also applies `wpo_force_webp_serve_using_altered_html` filter for users to be able to
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* force Altered HTML method
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*
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* @return bool
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*/
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public function is_webp_redirection_possible() {
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if (apply_filters('wpo_force_webp_serve_using_altered_html', false)) {
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return false;
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}
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$redirection_possible = WP_Optimize()->get_options()->get_option('redirection_possible');
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if (!empty($redirection_possible)) return 'true' === $redirection_possible;
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return $this->run_webp_serving_self_test();
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}
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/**
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* Decide whether the browser requesting the URL can accept webp images or not
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*
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* @return bool
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*/
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private function is_browser_accepting_webp() {
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return (isset($_SERVER['HTTP_ACCEPT']) && false !== strpos($_SERVER['HTTP_ACCEPT'], 'image/webp'));
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}
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/**
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* Detect whether using alter HTML method is possible or not
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*
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* @return bool
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*/
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private function is_alter_html_possible() {
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if ($this->is_browser_accepting_webp()) {
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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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* Setup alter html method
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*/
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private function use_alter_html() {
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WPO_WebP_Alter_HTML::get_instance();
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}
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/**
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* Initialize .htaccess
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*/
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private function setup_htaccess_file() {
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if (null !== $this->_htaccess) return;
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$wp_uploads = wp_get_upload_dir();
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$htaccess_file = $wp_uploads['basedir'] . '/.htaccess';
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if (!file_exists($htaccess_file)) {
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file_put_contents($htaccess_file, '');
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}
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$this->_htaccess = new WP_Optimize_Htaccess($htaccess_file);
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}
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/**
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* Save .htaccess rules
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*
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* @return void
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*/
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public function save_htaccess_rules() {
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$this->setup_htaccess_file();
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$this->add_webp_mime_type();
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$htaccess_comment_section = 'WP-Optimize WebP Rules';
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if ($this->_htaccess->is_commented_section_exists($htaccess_comment_section)) return;
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$this->_htaccess->update_commented_section($this->prepare_webp_htaccess_rules(), $htaccess_comment_section);
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$this->_htaccess->write_file();
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WP_Optimize()->get_options()->update_option('htaccess_has_webp_rules', true);
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}
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/**
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* Empty .htaccess file
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*/
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public function empty_htaccess_file() {
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// Setting default to true, so on initial run (when option is not yet present in the DB) we don't break the function here
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if (!WP_Optimize()->get_options()->get_option('htaccess_has_webp_rules', true)) return;
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$this->setup_htaccess_file();
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$htaccess_comment_sections = array(
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'WP-Optimize WebP Rules',
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'Register webp mime type',
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);
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foreach ($htaccess_comment_sections as $htaccess_comment_section) {
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if (!$this->_htaccess->is_commented_section_exists($htaccess_comment_section)) continue;
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$this->_htaccess->remove_commented_section($htaccess_comment_section);
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$this->_htaccess->write_file();
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}
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WP_Optimize()->get_options()->update_option('htaccess_has_webp_rules', false);
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}
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/**
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* Prepare array of htaccess rules to use webp images.
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*
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* @return array
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*/
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private function prepare_webp_htaccess_rules() {
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return array(
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array(
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'<IfModule mod_rewrite.c>',
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'RewriteEngine On',
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'',
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'# Redirect to existing converted image in same dir (if browser supports webp)',
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'RewriteCond %{HTTP_ACCEPT} image/webp',
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'RewriteCond %{REQUEST_FILENAME} (?i)(.*)(\.jpe?g|\.png)$',
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'RewriteCond %1%2\.webp -f',
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'RewriteRule (?i)(.*)(\.jpe?g|\.png)$ %1%2\.webp [T=image/webp,E=EXISTING:1,E=ADDVARY:1,L]',
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'',
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'# Make sure that browsers which does not support webp also gets the Vary:Accept header',
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'# when requesting images that would be redirected to webp on browsers that does.',
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array(
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'<IfModule mod_headers.c>',
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array(
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'<FilesMatch "(?i)\.(jpe?g|png)$">',
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'Header append "Vary" "Accept"',
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'</FilesMatch>',
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),
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'</IfModule>',
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),
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'',
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'</IfModule>',
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'',
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),
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array(
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'# Rules for handling requests for webp images',
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'# ---------------------------------------------',
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'',
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'# Set Vary:Accept header if we came here by way of our redirect, which set the ADDVARY environment variable',
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'# The purpose is to make proxies and CDNs aware that the response varies with the Accept header',
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'<IfModule mod_headers.c>',
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array(
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'<IfModule mod_setenvif.c>',
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'# Apache appends "REDIRECT_" in front of the environment variables defined in mod_rewrite, but LiteSpeed does not',
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'# So, the next lines are for Apache, in order to set environment variables without "REDIRECT_"',
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'SetEnvIf REDIRECT_EXISTING 1 EXISTING=1',
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'SetEnvIf REDIRECT_ADDVARY 1 ADDVARY=1',
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'',
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'Header append "Vary" "Accept" env=ADDVARY',
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'',
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'# Set X-WPO-WebP header for diagnose purposes',
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'Header set "X-WPO-WebP" "Redirected directly to existing webp" env=EXISTING',
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'</IfModule>',
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),
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'</IfModule>',
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),
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);
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}
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/**
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* Add webp mime type to htaccess rules.
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*/
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private function add_webp_mime_type() {
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$htaccess_comment_section = 'Register webp mime type';
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if ($this->_htaccess->is_exists() && !$this->_htaccess->is_commented_section_exists($htaccess_comment_section)) {
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$webp_mime_type = array(
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array(
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'<IfModule mod_mime.c>',
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'AddType image/webp .webp',
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'</IfModule>',
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),
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);
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$this->_htaccess->update_commented_section($webp_mime_type, $htaccess_comment_section);
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$this->_htaccess->write_file();
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}
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}
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/**
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* Checks whether webp conversion test is successful or not
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*
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* @return bool
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*/
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public function is_webp_conversion_successful() {
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$upload_dir = wp_upload_dir();
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$destination = $upload_dir['basedir']. '/wpo/images/wpo_logo_small.png.webp';
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return file_exists($destination);
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}
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/**
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* Checks whether sample webp conversion test should be run or not
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*
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* @return bool Returns true if sample test should be run, false otherwise
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*/
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public function should_run_webp_conversion_test() {
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$webp_conversion_test = $this->get_webp_conversion_test_result();
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return (true !== $webp_conversion_test);
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}
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/**
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* Returns webp conversion test result
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*
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* @return boolean Returns the value of the webp_conversion_test saved in the options table
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*/
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private function get_webp_conversion_test_result() {
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return (bool) WP_Optimize()->get_options()->get_option('webp_conversion_test');
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}
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/**
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* Checks whether the webp redirection is possible or not and sets flag
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*
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* @return bool Returns true if webp is served successfully, false otherwise
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*/
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private function run_webp_serving_self_test() {
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$self_test = WPO_WebP_Self_Test::get_instance();
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if ($self_test->is_webp_served()) {
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WP_Optimize()->get_options()->update_option('redirection_possible', 'true');
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return true;
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}
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WP_Optimize()->get_options()->update_option('redirection_possible', 'false');
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$this->empty_htaccess_file();
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return false;
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}
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/**
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* Resets webp serving method by running self test, if needed purges cache and empties `uploads/.htaccess` file
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*/
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public function reset_webp_serving_method() {
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if (self::is_shell_functions_available() && $this->_should_use_webp) {
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$this->reset_webp_options();
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$this->run_self_test();
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list($old_redirection_possible, $new_redirection_possible) = $this->get_old_and_new_redirection_possibility();
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$this->maybe_purge_cache($old_redirection_possible, $new_redirection_possible);
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$this->maybe_empty_htaccess_file($new_redirection_possible);
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} else {
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$this->disable_webp_conversion();
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}
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}
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/**
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* Resets WebP related options
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*/
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private function reset_webp_options() {
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$options = WP_Optimize()->get_options();
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$options->update_option('old_redirection_possible', $options->get_option('redirection_possible'));
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$options->update_option('webp_conversion_test', false);
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$options->update_option('webp_converters', false);
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$options->update_option('redirection_possible', false);
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$this->remove_webp_test_image_file();
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}
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/**
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* Running self test to find available converters and possibility of serving webp using redirection method
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*/
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private function run_self_test() {
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$this->set_converter_status();
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if ($this->get_webp_conversion_test_result()) {
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$this->save_htaccess_rules();
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$this->run_webp_serving_self_test();
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} else {
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$this->disable_webp_conversion();
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}
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}
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/**
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* Gets old and new redirection possibility values
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*
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* @return array
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*/
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private function get_old_and_new_redirection_possibility() {
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$options = WP_Optimize()->get_options();
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return array(
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$options->get_option('old_redirection_possible'),
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$options->get_option('redirection_possible'),
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);
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}
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/**
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* Cache is cleared when there is a change in the potential for serving WebP using redirection.
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*
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* @param string $old_redirection_possible
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* @param string $new_redirection_possible
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*/
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private function maybe_purge_cache($old_redirection_possible, $new_redirection_possible) {
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if ($old_redirection_possible !== $new_redirection_possible) {
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WP_Optimize()->get_page_cache()->purge();
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}
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}
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/**
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* Remove redirection rules from `uploads/.htaccess` file if redirection is not possible
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*
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* @param string $new_redirection_possible
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*/
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private function maybe_empty_htaccess_file($new_redirection_possible) {
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if ('false' === $new_redirection_possible) {
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$this->empty_htaccess_file();
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}
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}
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/**
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* Initialize cron scheduler
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*/
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public function init_webp_cron_scheduler() {
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if (!wp_next_scheduled('wpo_reset_webp_conversion_test_result')) {
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wp_schedule_event(time(), 'wpo_daily', 'wpo_reset_webp_conversion_test_result');
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}
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}
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/**
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* Remove all cron schedules
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*/
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public function remove_webp_cron_schedules() {
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wp_clear_scheduled_hook('wpo_reset_webp_conversion_test_result');
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}
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/**
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* Return the true if webp conversion is enabled and vice-versa
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*
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* @return bool
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*/
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public function is_webp_conversion_enabled() {
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return $this->_should_use_webp;
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}
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/**
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* Set the webp_conversion option value to false and remove webp cron schedules
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*/
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public function disable_webp_conversion() {
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$this->empty_htaccess_file();
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WP_Optimize()->get_options()->update_option("webp_conversion", false);
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$this->remove_webp_cron_schedules();
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}
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/**
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* Remove webp converted test image file
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*/
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private function remove_webp_test_image_file() {
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$upload_dir = wp_upload_dir();
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$destination = $upload_dir['basedir']. '/wpo/images/wpo_logo_small.png.webp';
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if (@file_exists($destination)) { // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged -- suppress PHP warning in case of failure
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@unlink($destination); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged -- suppress PHP warning in case of failure
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}
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}
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/**
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* Run during plugin deactivation
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*/
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public function plugin_deactivate() {
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$this->empty_htaccess_file();
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$this->remove_webp_test_image_file();
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}
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/**
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* Determines whether the php shell functions are available or not
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*
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* @return bool
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*/
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public static function is_shell_functions_available() {
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$shell_functions = self::get_shell_functions();
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foreach ($shell_functions as $shell_function) {
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if (!function_exists($shell_function)) return false;
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}
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return true;
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}
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/**
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* List of php shell function names
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*
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* @return string[]
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*/
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private static function get_shell_functions() {
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return array(
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'escapeshellarg',
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'escapeshellcmd',
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'exec',
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'passthru',
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'proc_close',
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'proc_get_status',
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'proc_nice',
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'proc_open',
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'proc_terminate',
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'shell_exec',
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'system',
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);
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}
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}
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endif;
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