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<?php /** * Ajax Cache. * * @package Builder */ if ( ! defined( 'ABSPATH' ) ) { exit; // Exit if accessed directly. } /** * Class to cache commonly used AJAX requests. */ class ET_Builder_Ajax_Cache { /** * Instance of this class. * * @var ET_Builder_Ajax_Cache */ private static $_instance; /** * Transient name. * * @var string */ protected $_transient = 'et_builder_ajax_cache'; /** * Flag to determine whether to save cache or not on `shutdown` hook. * * @var bool */ protected $_dirty = false; /** * List of all ajax cache. * * @var Array */ protected $_cache; /** * ET_Builder_Ajax_Cache constructor. */ public function __construct() { add_action( 'et_builder_ajax_cache_clear', array( $this, 'clear' ), 10, 1 ); add_action( 'shutdown', array( $this, 'save' ) ); add_filter( 'et_builder_dynamic_asset_deps', array( $this, 'add_cache_dep' ), 10, 2 ); } /** * Returns whether cache file exists or not. * * @since 4.0.10 * * @return bool */ public function file_exists() { $file = $this->get_file_name(); return $file && et_()->WPFS()->is_readable( $file ); } /** * Returns whether cache is empty or not. * * @since 4.0.10 * * @return bool */ public function is_empty() { $this->load(); return empty( $this->_cache ); } /** * Enqueue ajax cache as definitions dependency. * * @since 4.0.10 * * @param array $deps Dependencies array. * @param string $key Script handle. * * @return array */ public function add_cache_dep( $deps, $key ) { // Skip all static assets but definitions. if ( 'et-dynamic-asset-definitions' !== $key ) { return $deps; } if ( ! $this->file_exists() && ! $this->write_file() ) { // Bail out if cache is empty and cannot write the file. return $deps; } // Enqueue ajax cache as definitions dependency. $handle = 'et-ajax-cache'; $deps[] = $handle; wp_register_script( $handle, $this->get_url(), array(), ET_BUILDER_VERSION, false ); return $deps; } /** * Load cache. * * @since 4.0.10 * * @return void */ public function load() { if ( is_array( $this->_cache ) ) { // Cache was already loaded. return; } $this->_cache = get_transient( $this->_transient ); if ( ! is_array( $this->_cache ) ) { $this->_cache = array(); $this->delete_file(); } } /** * Save cache. * * @since 4.0.10 * * @return void */ public function save() { // Ensure cache is loaded. $this->load(); if ( $this->_dirty ) { set_transient( $this->_transient, $this->_cache ); $this->delete_file(); } } /** * Write cache file. * * @since 4.0.10 * * @return bool */ public function write_file() { if ( $this->is_empty() ) { return false; } $file = $this->get_file_name(); $cache = ''; foreach ( $this->_cache as $key => $value ) { $cache = sprintf( '"%s":%s,', $key, $value ); } $cache = sprintf( '{"ajaxCache":{%s}}', rtrim( $cache, ',' ) ); $cache = sprintf( 'window.ETBuilderBackend=jQuery.extend(true,%s,window.ETBuilderBackend)', $cache ); et_()->WPFS()->put_contents( $file, $cache ); return $this->file_exists(); } /** * Delete cache file. * * @since 4.0.10 * * @return void */ public function delete_file() { if ( $this->file_exists() ) { et_()->WPFS()->delete( $this->get_file_name() ); } } /** * Set cache key. * * @since 4.0.10 * * @param string $key Cache key. * @param string $content Cache value. * * @return void */ public function set( $key, $content ) { $this->load(); $this->_cache[ $key ] = wp_json_encode( $content ); $this->_dirty = true; } /** * Unset cache key. * * @since 4.0.10 * * @param string $key Cache key. * * @return void */ public function unset_( $key ) { $this->load(); if ( isset( $this->_cache[ $key ] ) ) { unset( $this->_cache[ $key ] ); $this->_dirty = true; } } /** * Clear cache. * * @return void */ public function clear() { delete_transient( $this->_transient ); } /** * Get cache file name. * * @since 4.0.10 * * @return string. */ public function get_file_name() { // Per language Cache due to some data being localized. $lang = is_admin() || et_fb_is_enabled() ? get_user_locale() : get_locale(); $lang = trim( sanitize_file_name( $lang ), '.' ); $prefix = 'ajax'; $cache = et_()->path( et_core_cache_dir()->path, $lang ); $files = glob( "{$cache}/{$prefix}-*.js" ); $exists = is_array( $files ) && $files; if ( $exists ) { return $files[0]; } wp_mkdir_p( $cache ); // Create uniq filename. $uniq = str_replace( '.', '', (string) microtime( true ) ); $file = "{$cache}/{$prefix}-{$uniq}.js"; return et_()->WPFS()->is_writable( dirname( $file ) ) ? $file : false; } /** * Get cache url. * * @since 4.0.10 * * @return string */ public function get_url() { $file = $this->get_file_name(); $lang = basename( dirname( $file ) ); $name = basename( $file ); return et_()->path( et_core_cache_dir()->url, $lang, $name ); } /** * Get the class instance. * * @since 4.0.10 * * @return ET_Builder_Ajax_Cache */ public static function instance() { if ( ! self::$_instance ) { self::$_instance = new self(); } return self::$_instance; } } ET_Builder_Ajax_Cache::instance();