<?php
/**
* Class and methods to defer JS/CSS and include critical CSS.
*
* @link https://ewww.io/swis/
* @package SWIS_Performance
*/
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
/**
* Main SWIS_Performance Class.
*/
final class SWIS_Performance {
/* Singleton */
/**
* The one and only true SWIS_Performance
*
* @var SWIS_Performance The one and only true SWIS_Performance
*/
private static $instance;
/**
* SWIS Settings object for option pages and related functions.
*
* @var object|\SWIS\Settings
*/
public $settings;
/**
* SWIS Buffer object for HTML parsing.
*
* @var object|\SWIS\Buffer
*/
public $buffer;
/**
* SWIS Element_Filter object for tag/element filtering.
*
* @var object|\SWIS\Element_Filter
*/
public $element_filter;
/**
* SWIS Cache object.
*
* @var object|\SWIS\Cache
*/
public $cache;
/**
* SWIS Cache Preload object.
*
* @var object|\SWIS\Cache_Preload
*/
public $cache_preload;
/**
* SWIS CDN parser object.
*
* @var object|\SWIS\CDN
*/
public $cdn;
/**
* SWIS Defer CSS object.
*
* @var object|\SWIS\Defer_CSS
*/
public $defer_css;
/**
* SWIS Defer JS object.
*
* @var object|\SWIS\Defer_JS
*/
public $defer_js;
/**
* SWIS Minify CSS object.
*
* @var object|\SWIS\Minify_CSS
*/
public $minify_css;
/**
* SWIS Minify JS object.
*
* @var object|\SWIS\Minify_JS
*/
public $minify_js;
/**
* SWIS GZIP object.
*
* @var object|\SWIS\GZIP
*/
public $gzip;
/**
* SWIS Optimize_Fonts object.
*
* @var object|\SWIS\Optimize_Fonts
*/
public $fonts;
/**
* SWIS Prefetch object.
*
* @var object|\SWIS\Prefetch
*/
public $prefetch;
/**
* SWIS Slim object.
*
* @var object|\SWIS\Slim
*/
public $slim;
/**
* Main SWIS_Performance instance.
*
* Ensures that only one instance of SWIS_Performance exists in memory at any given time.
*
* @static
*/
public static function instance() {
if ( ! isset( self::$instance ) && ! ( self::$instance instanceof SWIS_Performance ) ) {
global $wpdb;
if ( ! isset( $wpdb->swis_queue ) ) {
$wpdb->swis_queue = $wpdb->prefix . 'swis_queue';
}
self::$instance = new SWIS_Performance;
self::$instance->setup_constants();
add_action( 'plugins_loaded', array( self::$instance, 'load_textdomain' ), 9 );
add_filter( 'sq_lateloading', '__return_true' );
if ( self::$instance->php_supported() && self::$instance->wp_supported() ) {
self::$instance->includes();
self::$instance->settings = new \SWIS\Settings();
add_action( 'plugins_loaded', array( self::$instance, 'init' ) );
add_filter( 'update_option_swis_performance', array( self::$instance, 'options_updated' ), 10, 2 );
}
}
return self::$instance;
}
/**
* Throw error on object clone.
*
* The whole idea of the singleton design pattern is that there is a single
* object. Therefore, we don't want the object to be cloned.
*/
public function __clone() {
// Cloning instances of the class is forbidden.
_doing_it_wrong( __METHOD__, esc_html__( 'Cannot clone core object.', 'swis-performance' ), esc_html( SWIS_PLUGIN_VERSION ) );
}
/**
* Disable unserializing of the class.
*/
public function __wakeup() {
// Unserializing instances of the class is forbidden.
_doing_it_wrong( __METHOD__, esc_html__( 'Cannot unserialize (wakeup) the core object.', 'swis-performance' ), esc_html( SWIS_PLUGIN_VERSION ) );
}
/**
* Class initialization for plugin.
*/
function init() {
self::$instance->buffer = new \SWIS\Buffer();
self::$instance->element_filter = new \SWIS\Element_Filter();
self::$instance->cache = new \SWIS\Cache();
self::$instance->cache_preload = new \SWIS\Cache_Preload();
self::$instance->cdn = new \SWIS\CDN();
self::$instance->defer_js = new \SWIS\Defer_JS();
self::$instance->defer_css = new \SWIS\Defer_CSS();
self::$instance->minify_js = new \SWIS\Minify_JS();
self::$instance->minify_css = new \SWIS\Minify_CSS();
self::$instance->gzip = new \SWIS\GZIP();
self::$instance->fonts = new \SWIS\Optimize_Fonts();
self::$instance->prefetch = new \SWIS\Prefetch();
self::$instance->slim = new \SWIS\Slim();
// Background/Async classes.
self::$instance->cache_preload_async = new \SWIS\Cache_Preload_Async();
self::$instance->cache_preload_background = new \SWIS\Cache_Preload_Background();
self::$instance->test_async = new \SWIS\Test_Async_Request();
register_deactivation_hook( SWIS_PLUGIN_FILE, array( self::$instance->gzip, 'remove_htaccess_rules' ) );
}
/**
* Make sure we are on a supported version of PHP.
*
* @access private
*/
private function php_supported() {
if ( ! defined( 'PHP_VERSION_ID' ) || PHP_VERSION_ID < 70200 ) {
add_action( 'network_admin_notices', array( self::$instance, 'unsupported_php_notice' ) );
add_action( 'admin_notices', array( self::$instance, 'unsupported_php_notice' ) );
return false;
}
return true;
}
/**
* Make sure we are on a supported version of WP.
*
* @access private
*/
private function wp_supported() {
global $wp_version;
if ( version_compare( $wp_version, '5.4' ) >= 0 ) {
return true;
}
add_action( 'network_admin_notices', array( self::$instance, 'unsupported_wp_notice' ) );
add_action( 'admin_notices', array( self::$instance, 'unsupported_wp_notice' ) );
return false;
}
/**
* Display a notice that the PHP version is too old.
*/
public function unsupported_php_notice() {
echo '<div id="swis-warning-php" class="notice notice-error"><p><a href="https://docs.ewww.io/article/55-upgrading-php" target="_blank">' . esc_html__( 'For performance and security reasons, SWIS Performance requires PHP 7.2 or greater. If you are unsure how to upgrade to a supported version, ask your webhost for instructions.', 'swis-performance' ) . '</a></p></div>';
}
/**
* Display a notice that the WP version is too old.
*/
public function unsupported_wp_notice() {
echo '<div id="swis-warning-wp" class="notice notice-error"><p>' . esc_html__( 'SWIS Performance requires WordPress 5.0 or greater, please update your website.', 'swis-performance' ) . '</p></div>';
}
/**
* Setup plugin constants.
*
* @access private
*/
private function setup_constants() {
// This is the full system path to the plugin folder.
define( 'SWIS_PLUGIN_PATH', plugin_dir_path( SWIS_PLUGIN_FILE ) );
// The directory where cached HTML pages are stored (if page caching is enabled ).
define( 'SWIS_CACHE_DIR', WP_CONTENT_DIR . '/swis/cache/html' );
// The site for auto-update checking.
define( 'SWIS_SL_STORE_URL', 'https://ewww.io' );
// Product ID for update checking.
define( 'SWIS_SL_ITEM_ID', 1188482 );
}
/**
* Include required files.
*
* @access private
*/
private function includes() {
// All the base functions for our plugins.
require_once( SWIS_PLUGIN_PATH . 'includes/class-base.php' );
// All the parsing functions for our plugins.
require_once( SWIS_PLUGIN_PATH . 'includes/class-page-parser.php' );
// Sets up the settings page and options.
require_once( SWIS_PLUGIN_PATH . 'includes/class-settings.php' );
// Starts the HTML buffer for all other functions to parse.
require_once( SWIS_PLUGIN_PATH . 'includes/class-buffer.php' );
// Parses the HTML buffer for elements that should be filtered by multiple classes.
require_once( SWIS_PLUGIN_PATH . 'includes/class-element-filter.php' );
// The test async class and methods.
require_once( SWIS_PLUGIN_PATH . 'includes/class-test-async-request.php' );
// The Caching class & methods.
require_once( SWIS_PLUGIN_PATH . 'includes/class-cache.php' );
// The Cache Engine class & methods.
require_once( SWIS_PLUGIN_PATH . 'includes/class-cache-engine.php' );
// The WebP Caching extension class & methods.
require_once( SWIS_PLUGIN_PATH . 'includes/class-cache-webp.php' );
// The Disk Cache class & methods.
require_once( SWIS_PLUGIN_PATH . 'includes/class-disk-cache.php' );
// The Cache Preloader class & methods.
require_once( SWIS_PLUGIN_PATH . 'includes/class-cache-preload.php' );
// Async Request methods for Cache Preloader.
require_once( SWIS_PLUGIN_PATH . 'includes/class-cache-preload-async.php' );
// Background Processing methods for Cache Preloader.
require_once( SWIS_PLUGIN_PATH . 'includes/class-cache-preload-background.php' );
// The CDN-parsing class & functions.
require_once( SWIS_PLUGIN_PATH . 'includes/class-cdn.php' );
// The JS deferring class & functions.
require_once( SWIS_PLUGIN_PATH . 'includes/class-defer-js.php' );
// The CSS deferring class & functions.
require_once( SWIS_PLUGIN_PATH . 'includes/class-defer-css.php' );
// The JS minify class & functions.
require_once( SWIS_PLUGIN_PATH . 'includes/class-minify-js.php' );
// The CSS minify class & functions.
require_once( SWIS_PLUGIN_PATH . 'includes/class-minify-css.php' );
// The class to auto-insert GZIP and other rules.
require_once( SWIS_PLUGIN_PATH . 'includes/class-gzip.php' );
// The class to auto-detect Google Fonts, inline and pre-connect them.
require_once( SWIS_PLUGIN_PATH . 'includes/class-optimize-fonts.php' );
// The class to auto-insert DNS prefetch hints.
require_once( SWIS_PLUGIN_PATH . 'includes/class-prefetch.php' );
// The class to eliminate unused JS/CSS and related tools.
require_once( SWIS_PLUGIN_PATH . 'includes/class-slim.php' );
}
/**
* Makes sure to load the language files.
*/
public function load_textdomain() {
load_plugin_textdomain( 'swis-performance', false, SWIS_PLUGIN_PATH . 'languages/' );
}
/**
* Run any actions triggered by an update to the swis_performance options.
*
* @param mixed $old_settings The old value(s).
* @param mixed $new_settings The new value(s).
*/
public function options_updated( $old_settings, $new_settings ) {
$network_wide = false;
if ( ! function_exists( 'is_plugin_active_for_network' ) && is_multisite() ) {
require_once( ABSPATH . 'wp-admin/includes/plugin.php' );
}
if ( is_multisite() && is_plugin_active_for_network( plugin_basename( SWIS_PLUGIN_FILE ) ) ) {
$network_wide = true;
}
if ( empty( $old_settings['cache'] ) && ! empty( $new_settings['cache'] ) ) {
$this->cache->on_activation( $network_wide );
}
if ( ! empty( $old_settings['cache'] ) && empty( $new_settings['cache'] ) ) {
remove_all_actions( 'swis_site_cache_cleared' );
remove_all_actions( 'swis_cache_by_url_cleared' );
$this->cache->on_deactivation( $network_wide );
}
if ( ! empty( $old_settings['cache'] ) && ! empty( $new_settings['cache'] ) ) {
$cache_clear_settings = array( 'defer_css', 'defer_js', 'minify_css', 'minify_js', 'critical_css', 'optimize_fonts', 'cdn_domain' );
foreach ( $cache_clear_settings as $key ) {
if ( isset( $old_settings[ $key ] ) && isset( $new_settings[ $key ] ) && $old_settings[ $key ] !== $new_settings[ $key ] ) {
$this->cache->clear_complete_cache();
}
}
}
if ( (bool) $old_settings['cache_settings']['webp'] !== (bool) $new_settings['cache_settings']['webp'] ) {
$this->cache->clear_complete_cache();
}
if ( $this->settings->background_mode_enabled() ) {
if ( empty( $old_settings['cache_preload'] ) && ! empty( $new_settings['cache_preload'] ) ) {
// If cache preload is enabled, start the preloader.
$this->cache_preload->start_preload();
} elseif ( ! empty( $old_settings['cache_preload'] ) && empty( $new_settings['cache_preload'] ) ) {
// If cache preload is disabled, cancel anything that is running.
$this->cache_preload->stop_preload();
} elseif ( ! empty( $new_settings['cache_preload'] ) && ! empty( $old_settings['cache'] ) && empty( $new_settings['cache'] ) ) {
// If caching is disabled and preload is still enabled, also cancel.
$this->cache_preload->stop_preload();
}
}
}
}