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class-cachify.php
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class-cachify.php
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<?php
/**
* Class for initializing the hooks and actions.
*
* @package Cachify
*/
/* Quit */
defined( 'ABSPATH' ) || exit;
/**
* Cachify
*/
final class Cachify {
/**
* Plugin options
*
* @since 2.0
* @var array
*/
private static $options;
/**
* Caching method
*
* @since 2.0
* @var object
*/
private static $method;
/**
* Whether we are on an Nginx server or not.
*
* @since 2.2.5
* @var boolean
*/
private static $is_nginx;
/**
* Method settings
*
* @since 2.0.9
* @var integer
*/
const METHOD_DB = 0;
const METHOD_APC = 1;
const METHOD_HDD = 2;
const METHOD_MMC = 3;
/**
* Minify settings
*
* @since 2.0.9
* @var integer
*/
const MINIFY_DISABLED = 0;
const MINIFY_HTML_ONLY = 1;
const MINIFY_HTML_JS = 2;
/**
* REST endpoints
*
* @var string
*/
const REST_NAMESPACE = 'cachify/v1';
const REST_ROUTE_FLUSH = 'flush';
/**
* Pseudo constructor
*
* @since 2.0.5
* @change 2.0.5
*/
public static function instance() {
new self();
}
/**
* Constructor
*
* @since 1.0.0
* @change 2.2.2
*
* @return void
*/
public function __construct() {
/* Set defaults */
self::_set_default_vars();
self::$is_nginx = $GLOBALS['is_nginx'];
/* Publish hooks */
add_action( 'init', array( __CLASS__, 'register_publish_hooks' ), 99 );
/* Flush Hooks */
add_action( 'init', array( __CLASS__, 'register_flush_cache_hooks' ), 10, 0 );
add_action( 'cachify_remove_post_cache', array( __CLASS__, 'remove_page_cache_by_post_id' ) );
/* Register scripts */
add_action( 'init', array( __CLASS__, 'register_scripts' ) );
/* Register styles */
add_action( 'init', array( __CLASS__, 'register_styles' ) );
/* Flush icon */
add_action( 'admin_bar_menu', array( __CLASS__, 'add_flush_icon' ), 90 );
/* Flush icon script */
add_action( 'admin_bar_menu', array( __CLASS__, 'add_flush_icon_script' ), 90 );
/* Flush REST endpoint */
add_action( 'rest_api_init', array( __CLASS__, 'add_flush_rest_endpoint' ) );
add_action( 'init', array( __CLASS__, 'process_flush_request' ) );
/* Flush (post) cache if comment is made from frontend or backend */
add_action( 'pre_comment_approved', array( __CLASS__, 'pre_comment' ), 99, 2 );
/* Add Cron for clearing the HDD Cache */
if ( self::METHOD_HDD === self::$options['use_apc'] ) {
add_filter( 'cron_schedules', array( __CLASS__, 'add_cron_cache_expiration' ) );
$timestamp = wp_next_scheduled( 'hdd_cache_cron' );
if ( false === $timestamp ) {
wp_schedule_event( time(), 'cachify_cache_expire', 'hdd_cache_cron' );
}
add_action( 'hdd_cache_cron', array( __CLASS__, 'run_hdd_cache_cron' ) );
}
if ( is_admin() ) {
/* Backend */
add_action( 'wpmu_new_blog', array( __CLASS__, 'install_later' ) );
add_action( 'delete_blog', array( __CLASS__, 'uninstall_later' ) );
add_action( 'admin_init', array( __CLASS__, 'register_textdomain' ) );
add_action( 'admin_init', array( __CLASS__, 'register_settings' ) );
add_action( 'admin_menu', array( __CLASS__, 'add_page' ) );
add_action( 'admin_enqueue_scripts', array( __CLASS__, 'add_admin_resources' ) );
add_action( 'admin_head', array( __CLASS__, 'admin_dashboard_styles' ) );
add_action( 'doing_dark_mode', array( __CLASS__, 'admin_dashboard_dark_mode_styles' ) );
add_action( 'transition_comment_status', array( __CLASS__, 'touch_comment' ), 10, 3 );
add_action( 'edit_comment', array( __CLASS__, 'edit_comment' ) );
add_filter( 'dashboard_glance_items', array( __CLASS__, 'add_dashboard_count' ) );
add_filter( 'plugin_row_meta', array( __CLASS__, 'row_meta' ), 10, 2 );
add_filter( 'plugin_action_links_' . CACHIFY_BASE, array( __CLASS__, 'action_links' ) );
} else {
/* Frontend */
add_action( 'template_redirect', array( __CLASS__, 'manage_cache' ), 0 );
add_action( 'do_robots', array( __CLASS__, 'robots_txt' ) );
}
}
/**
* Deactivation hook
*
* @since 2.1.0
* @change 2.1.0
*/
public static function on_deactivation() {
/* Remove hdd cache cron when hdd is selected */
if ( self::METHOD_HDD === self::$options['use_apc'] ) {
$timestamp = wp_next_scheduled( 'hdd_cache_cron' );
if ( false !== $timestamp ) {
wp_unschedule_event( $timestamp, 'hdd_cache_cron' );
}
}
self::flush_total_cache( true );
}
/**
* Activation hook
*
* @since 1.0
* @change 2.1.0
*/
public static function on_activation() {
/* Multisite & Network */
if ( is_multisite() && ! empty( $_GET['networkwide'] ) ) {
/* Blog IDs */
$ids = self::_get_blog_ids();
/* Loop over blogs */
foreach ( $ids as $id ) {
switch_to_blog( $id );
self::_install_backend();
}
/* Switch back */
restore_current_blog();
} else {
self::_install_backend();
}
}
/**
* Plugin installation on new MU blog.
*
* @since 1.0
* @change 1.0
*
* @param integer $id Blog ID.
*/
public static function install_later( $id ) {
/* No network plugin */
if ( ! is_plugin_active_for_network( CACHIFY_BASE ) ) {
return;
}
/* Switch to blog */
switch_to_blog( $id );
/* Install */
self::_install_backend();
/* Switch back */
restore_current_blog();
}
/**
* Actual installation of the options
*
* @since 1.0
* @change 2.0
*/
private static function _install_backend() {
add_option(
'cachify',
array()
);
/* Flush */
self::flush_total_cache( true );
}
/**
* Uninstalling of the plugin per MU blog.
*
* @since 1.0
* @change 2.1.0
*/
public static function on_uninstall() {
/* Global */
global $wpdb;
/* Multisite & Network */
if ( is_multisite() && ! empty( $_GET['networkwide'] ) ) {
/* Alter Blog */
$old = $wpdb->blogid;
/* Blog IDs */
$ids = self::_get_blog_ids();
/* Loop */
foreach ( $ids as $id ) {
switch_to_blog( $id );
self::_uninstall_backend();
}
/* Switch back */
switch_to_blog( $old );
} else {
self::_uninstall_backend();
}
}
/**
* Uninstalling of the plugin for MU and network.
*
* @since 1.0
* @change 1.0
*
* @param integer $id Blog ID.
*/
public static function uninstall_later( $id ) {
/* No network plugin */
if ( ! is_plugin_active_for_network( CACHIFY_BASE ) ) {
return;
}
/* Switch to blog */
switch_to_blog( $id );
/* Install */
self::_uninstall_backend();
/* Switch back */
restore_current_blog();
}
/**
* Actual uninstalling of the plugin
*
* @since 1.0
* @change 1.0
*/
private static function _uninstall_backend() {
/* Option */
delete_option( 'cachify' );
/* Flush cache */
self::flush_total_cache( true );
}
/**
* Get IDs of installed blogs
*
* @since 1.0
* @change 1.0
*
* @return array Blog IDs
*/
private static function _get_blog_ids() {
/* Global */
global $wpdb;
return $wpdb->get_col( "SELECT blog_id FROM `$wpdb->blogs`" );
}
/**
* Register the styles
*
* @since 2.4.0
*/
public static function register_styles() {
/* Register dashboard CSS */
wp_register_style(
'cachify-dashboard',
plugins_url( 'css/dashboard.min.css', CACHIFY_FILE ),
array(),
filemtime( plugin_dir_path( CACHIFY_FILE ) . 'css/dashboard.min.css' )
);
/* Register admin bar flush CSS */
wp_register_style(
'cachify-admin-bar-flush',
plugins_url( 'css/admin-bar-flush.min.css', CACHIFY_FILE ),
array(),
filemtime( plugin_dir_path( CACHIFY_FILE ) . 'css/admin-bar-flush.min.css' )
);
}
/**
* Register the scripts
*
* @since 2.4.0
*/
public static function register_scripts() {
/* Register admin bar flush script */
wp_register_script(
'cachify-admin-bar-flush',
plugins_url( 'js/admin-bar-flush.min.js', CACHIFY_FILE ),
array(),
filemtime( plugin_dir_path( CACHIFY_FILE ) . 'js/admin-bar-flush.min.js' ),
true
);
}
/**
* Register the language file
*
* @since 2.1.3
* @change 2.3.2
*/
public static function register_textdomain() {
load_plugin_textdomain( 'cachify' );
}
/**
* Set default options
*
* @since 2.0
* @change 2.0.7
*/
private static function _set_default_vars() {
/* Options */
self::$options = self::_get_options();
/* APC */
if ( self::METHOD_APC === self::$options['use_apc'] && Cachify_APC::is_available() ) {
self::$method = new Cachify_APC();
/* HDD */
} elseif ( self::METHOD_HDD === self::$options['use_apc'] && Cachify_HDD::is_available() ) {
self::$method = new Cachify_HDD();
/* MEMCACHED */
} elseif ( self::METHOD_MMC === self::$options['use_apc'] && Cachify_MEMCACHED::is_available() ) {
self::$method = new Cachify_MEMCACHED();
/* DB */
} else {
self::$method = new Cachify_DB();
}
}
/**
* Get options
*
* @since 2.0
* @change 2.3.0
*
* @return array Array of option values
*/
private static function _get_options() {
return wp_parse_args(
get_option( 'cachify' ),
array(
'only_guests' => 1,
'compress_html' => self::MINIFY_DISABLED,
'cache_expires' => 12,
'without_ids' => '',
'without_agents' => '',
'use_apc' => self::METHOD_DB,
'reset_on_post' => 1,
'reset_on_comment' => 0,
'sig_detail' => 0,
)
);
}
/**
* Modify robots.txt
*
* @since 1.0
* @since 2.1.9
* @since 2.4 Removed $data parameter and return value.
*/
public static function robots_txt() {
/* HDD only */
if ( self::METHOD_HDD === self::$options['use_apc'] ) {
echo 'Disallow: */cache/cachify/';
}
}
/**
* HDD Cache expiration cron action.
*
* @since 2.4
*/
public static function run_hdd_cache_cron() {
Cachify_HDD::clear_cache();
}
/**
* Add cache expiration cron schedule.
*
* @param array $schedules Array of previously added non-default schedules.
*
* @return array Array of non-default schedules with our tasks added.
*
* @since 2.4
*/
public static function add_cron_cache_expiration( $schedules ) {
$schedules['cachify_cache_expire'] = array(
'interval' => self::$options['cache_expires'] * 3600,
'display' => esc_html__( 'Cachify expire', 'cachify' ),
);
return $schedules;
}
/**
* Add the action links
*
* @since 1.0
* @change 1.0
*
* @param array $data Initial array with action links.
* @return array Merged array with action links.
*/
public static function action_links( $data ) {
/* Permissions? */
if ( ! current_user_can( 'manage_options' ) ) {
return $data;
}
return array_merge(
$data,
array(
sprintf(
'<a href="%s">%s</a>',
add_query_arg(
array(
'page' => 'cachify',
),
admin_url( 'options-general.php' )
),
esc_html__( 'Settings', 'cachify' )
),
)
);
}
/**
* Meta links of the plugin
*
* @since 0.5
* @change 2.0.5
*
* @param array $input Initial array with meta links.
* @param string $page Current page.
* @return array Merged array with meta links.
*/
public static function row_meta( $input, $page ) {
/* Permissions */
if ( CACHIFY_BASE !== $page ) {
return $input;
}
return array_merge(
$input,
array(
'<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=8CH5FPR88QYML" target="_blank" rel="noopener noreferrer">' . esc_html__( 'Donate', 'cachify' ) . '</a>',
'<a href="https://wordpress.org/support/plugin/cachify" target="_blank" rel="noopener noreferrer">' . esc_html__( 'Support', 'cachify' ) . '</a>',
)
);
}
/**
* Add cache properties to dashboard
*
* @since 2.0.0
* @change 2.2.2
*
* @param array $items Initial array with dashboard items.
* @return array Merged array with dashboard items.
*/
public static function add_dashboard_count( $items = array() ) {
/* Skip */
if ( ! current_user_can( 'manage_options' ) ) {
return $items;
}
/* Cache size */
$size = self::get_cache_size();
/* Caching method */
$method = call_user_func(
array(
self::$method,
'stringify_method',
)
);
/* Output of the cache size */
$cachesize = ( 0 === $size )
? esc_html__( 'Empty Cache', 'cachify' ) :
/* translators: %s: cache size */
sprintf( esc_html__( '%s Cache', 'cachify' ), size_format( $size ) );
/* Right now item */
$items[] = sprintf(
'<a href="%s" title="%s: %s" class="cachify-glance">
<svg class="cachify-icon cachify-icon--%s" aria-hidden="true" role="img">
<use href="%s#cachify-icon-%s" xlink:href="%s#cachify-icon-%s">
</svg> %s</a>',
add_query_arg(
array(
'page' => 'cachify',
),
admin_url( 'options-general.php' )
),
esc_attr( strtolower( $method ) ),
esc_html__( 'Caching method', 'cachify' ),
esc_attr( $method ),
plugins_url( 'images/symbols.svg', CACHIFY_FILE ),
esc_attr( strtolower( $method ) ),
plugins_url( 'images/symbols.svg', CACHIFY_FILE ),
esc_attr( strtolower( $method ) ),
$cachesize
);
return $items;
}
/**
* Get the cache size
*
* @since 2.0.6
* @change 2.0.6
*
* @return integer Cache size in bytes.
*/
public static function get_cache_size() {
$size = get_transient( 'cachify_cache_size' );
if ( ! $size ) {
/* Read */
$size = (int) call_user_func(
array(
self::$method,
'get_stats',
)
);
/* Save */
set_transient(
'cachify_cache_size',
$size,
60 * 15
);
}
return $size;
}
/**
* Add flush icon to admin bar menu
*
* @since 1.2
* @change 2.2.2
* @change 2.4.0 Adjust icon for flush request via AJAX
*
* @hook mixed cachify_user_can_flush_cache
*
* @param object $wp_admin_bar Object of menu items.
*/
public static function add_flush_icon( $wp_admin_bar ) {
/* Quit */
if ( ! is_admin_bar_showing() || ! apply_filters( 'cachify_user_can_flush_cache', current_user_can( 'manage_options' ) ) ) {
return;
}
/* Enqueue style */
wp_enqueue_style( 'cachify-admin-bar-flush' );
/* Display the admin icon anytime */
echo '<style>#wp-admin-bar-cachify{display:list-item !important} #wp-admin-bar-cachify .ab-icon{margin:0 !important} #wp-admin-bar-cachify .ab-icon:before{top:2px;margin:0;} #wp-admin-bar-cachify .ab-label{margin:0 5px}</style>';
/* Print area for aria live updates */
echo '<span class="ab-aria-live-area screen-reader-text" aria-live="polite"></span>';
/* Check if the flush action was used without AJAX */
$dashicon_class = 'dashicons-trash';
if ( isset( $_GET['_cachify'] ) && 'flushed' === $_GET['_cachify'] ) {
$dashicon_class = self::get_dashicon_success_class();
}
/* Add menu item */
$wp_admin_bar->add_menu(
array(
'id' => 'cachify',
'href' => wp_nonce_url( add_query_arg( '_cachify', 'flush' ), '_cachify__flush_nonce' ), // esc_url in /wp-includes/class-wp-admin-bar.php#L438.
'parent' => 'top-secondary',
'title' => '<span class="ab-icon dashicons ' . $dashicon_class . '" aria-hidden="true"></span>' .
'<span class="ab-label">' .
__(
'Flush site cache',
'cachify'
) .
'</span>',
'meta' => array(
'title' => esc_html__( 'Flush the cachify cache', 'cachify' ),
),
)
);
}
/**
* Returns the dashicon class for the success state in admin bar flush button
*
* @since 2.4.0
*
* @return string
*/
public static function get_dashicon_success_class() {
global $wp_version;
if ( version_compare( $wp_version, '5.2', '<' ) ) {
return 'dashicons-yes';
}
return 'dashicons-yes-alt';
}
/**
* Add a script to query the REST endpoint and animate the flush icon in admin bar menu
*
* @since 2.4.0
*
* @hook mixed cachify_user_can_flush_cache ?
*
* @param object $wp_admin_bar Object of menu items.
*/
public static function add_flush_icon_script( $wp_admin_bar ) {
/* Quit */
if ( ! is_admin_bar_showing() || ! apply_filters( 'cachify_user_can_flush_cache', current_user_can( 'manage_options' ) ) ) {
return;
}
/* Enqueue script */
wp_enqueue_script( 'cachify-admin-bar-flush' );
/* Localize script */
wp_localize_script(
'cachify-admin-bar-flush',
'cachify_admin_bar_flush_ajax_object',
array(
'url' => esc_url_raw( rest_url( self::REST_NAMESPACE . '/' . self::REST_ROUTE_FLUSH ) ),
'nonce' => wp_create_nonce( 'wp_rest' ),
'flushing' => __( 'Flushing cache', 'cachify' ),
'flushed' => __( 'Cache flushed successfully', 'cachify' ),
'dashicon_success' => self::get_dashicon_success_class(),
)
);
}
/**
* Registers an REST endpoint for the flush operation
*
* @change 2.4.0
*/
public static function add_flush_rest_endpoint() {
register_rest_route(
self::REST_NAMESPACE,
self::REST_ROUTE_FLUSH,
array(
'methods' => WP_REST_Server::DELETABLE,
'callback' => array(
__CLASS__,
'flush_cache',
),
'permission_callback' => array(
__CLASS__,
'user_can_manage_options',
),
)
);
}
/**
* Check if user can manage options
*
* @since 2.4.0
*
* @return bool
*/
public static function user_can_manage_options() {
return current_user_can( 'manage_options' );
}
/**
* Process plugin's meta actions
*
* @since 0.5
* @change 2.2.2
* @change 2.4.0 Extract cache flushing to own method and always redirect to referer with new value for `_cachify` param.
*
* @hook mixed cachify_user_can_flush_cache
*
* @param array $data Metadata of the plugin.
*/
public static function process_flush_request( $data ) {
/* Skip if not a flush request */
if ( empty( $_GET['_cachify'] ) || 'flush' !== $_GET['_cachify'] ) {
return;
}
/* Check nonce */
if ( empty( $_GET['_wpnonce'] ) || ! wp_verify_nonce( sanitize_key( $_GET['_wpnonce'] ), '_cachify__flush_nonce' ) ) {
return;
}
/* Skip if not necessary */
if ( ! is_admin_bar_showing() || ! apply_filters( 'cachify_user_can_flush_cache', current_user_can( 'manage_options' ) ) ) {
return;
}
/* Load on demand */
if ( ! function_exists( 'is_plugin_active_for_network' ) ) {
require_once( ABSPATH . 'wp-admin/includes/plugin.php' );
}
/* Flush cache */
self::flush_cache();
wp_safe_redirect(
add_query_arg(
'_cachify',
'flushed',
wp_get_referer()
)
);
exit();
}
/**
* Flush cache
*
* @since 2.4.0
*/
public static function flush_cache() {
/* Flush cache */
if ( is_multisite() && is_network_admin() ) {
/* Old blog */
$old = $GLOBALS['wpdb']->blogid;
/* Blog IDs */
$ids = self::_get_blog_ids();
/* Loop over blogs */
foreach ( $ids as $id ) {
switch_to_blog( $id );
self::flush_total_cache();
}
/* Switch back to old blog */
switch_to_blog( $old );
/* Notice */
if ( is_admin() ) {
add_action( 'network_admin_notices', array( __CLASS__, 'flush_notice' ) );
}
} else {
self::flush_total_cache();
/* Notice */
if ( is_admin() ) {
add_action( 'admin_notices', array( __CLASS__, 'flush_notice' ) );
}
}
/* Reschedule HDD Cache Cron */
if ( self::METHOD_HDD === self::$options['use_apc'] ) {
$timestamp = wp_next_scheduled( 'hdd_cache_cron' );
if ( false !== $timestamp ) {
wp_reschedule_event( $timestamp, 'cachify_cache_expire', 'hdd_cache_cron' );
wp_unschedule_event( $timestamp, 'hdd_cache_cron' );
}
}
if ( ! is_admin() ) {
wp_safe_redirect(
remove_query_arg(
'_cachify',
wp_get_referer()
)
);
exit();
}
}
/**
* Notice after successful flushing of the cache
*
* @since 1.2
* @change 2.2.2
*
* @hook mixed cachify_user_can_flush_cache
*/
public static function flush_notice() {
/* No admin */
if ( ! is_admin_bar_showing() || ! apply_filters( 'cachify_user_can_flush_cache', current_user_can( 'manage_options' ) ) ) {
return false;
}
printf(
'<div class="notice notice-success is-dismissible"><p>%s</p></div>',
esc_html__( 'Cachify cache is flushed.', 'cachify' )
);
}
/**
* Remove page from cache or flush on comment edit
*
* @since 0.1.0
* @change 2.1.2
*
* @param integer $id Comment ID.
*/
public static function edit_comment( $id ) {
if ( self::$options['reset_on_comment'] ) {
self::flush_total_cache();
} else {
self::remove_page_cache_by_post_id(
get_comment( $id )->comment_post_ID
);
}
}
/**
* Remove page from cache or flush on new comment
*
* @since 0.1.0
* @change 2.1.2
*
* @param mixed $approved Comment status.
* @param array $comment Array of properties.
* @return mixed Comment status.
*/
public static function pre_comment( $approved, $comment ) {
/* Approved comment? */
if ( 1 === $approved ) {
if ( self::$options['reset_on_comment'] ) {
self::flush_total_cache();
} else {
self::remove_page_cache_by_post_id( $comment['comment_post_ID'] );
}
}
return $approved;
}
/**
* Remove page from cache or flush on comment edit
*
* @since 0.1
* @change 2.1.2
*
* @param string $new_status New status.
* @param string $old_status Old status.
* @param object $comment The comment.
*/
public static function touch_comment( $new_status, $old_status, $comment ) {
if ( $new_status !== $old_status ) {
if ( self::$options['reset_on_comment'] ) {
self::flush_total_cache();
} else {
self::remove_page_cache_by_post_id( $comment->comment_post_ID );
}
}
}
/**
* Generate publish hook for custom post types
*
* @since 2.1.7 Make the function public
* @since 2.0.3
*
* @return void
*/
public static function register_publish_hooks() {
/* Available post types */
$post_types = get_post_types(
array(
'public' => true,
)
);
/* Empty data? */
if ( empty( $post_types ) ) {
return;
}
/* Loop the post types */
foreach ( $post_types as $post_type ) {
add_action( 'publish_' . $post_type, array( __CLASS__, 'publish_post_types' ), 10, 2 );
add_action( 'publish_future_' . $post_type, array( __CLASS__, 'flush_total_cache' ) );
}
}
/**
* Removes the post type cache on post updates
*
* @since 2.0.3
* @change 2.3.0
*
* @param integer $post_id Post ID.
* @param object $post Post object.
*/
public static function publish_post_types( $post_id, $post ) {
/* No post_id? */
if ( empty( $post_id ) || empty( $post ) ) {
return;
}
/* Post status check */
if ( ! in_array( $post->post_status, array( 'publish', 'future' ), true ) ) {
return;
}
/* Check user role */
if ( ! current_user_can( 'publish_posts' ) ) {
return;
}
/* Remove cache OR flush */
if ( 1 !== self::$options['reset_on_post'] ) {
self::remove_page_cache_by_post_id( $post_id );
} else {
self::flush_total_cache();
}
}