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<?php

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if ( ! defined( 'ABSPATH' ) ) {

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exit; // Exit if accessed directly

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}

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/**

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* Ajax Cache.

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class ET_Builder_Ajax_Cache {

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/**

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* @var ET_Builder_Ajax_Cache

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private static $_instance;

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/**

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* @var string

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protected $_transient = 'et_builder_ajax_cache';

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/**

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* @var bool

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protected $_dirty = false;

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/**

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* @var Array

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protected $_cache;

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/**

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* ET_Builder_Ajax_Cache constructor.

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public function __construct() {

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add_action( 'et_builder_ajax_cache_clear', array( $this, 'clear' ), 10, 1 );

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add_action( 'shutdown', array( $this, 'save' ) );

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add_filter( 'et_builder_dynamic_asset_deps', array( $this, 'add_cache_dep' ), 10, 2 );

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}

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/**

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* Returns whether cache file exists or not.

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* @since 4.0.10

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* @return bool

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public function file_exists() {

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$file = $this->get_file_name();

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return $file && et_()->WPFS()->is_readable( $file );

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}

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/**

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* Returns whether cache is empty or not.

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* @since 4.0.10

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* @return void

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public function is_empty() {

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$this->load();

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return empty( $this->_cache );

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}

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/**

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* Enqueue ajax cache as definitions dependency.

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* @since 4.0.10

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* @param array $deps Dependencies array.

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* @param string $key Script handle.

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* @return array

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public function add_cache_dep( $deps, $key ) {

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// Skip all static assets but definitions.

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if ( 'et-dynamic-asset-definitions' !== $key ) {

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return $deps;

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}

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if ( ! $this->file_exists() && ! $this->write_file() ) {

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// Bail out if cache is empty and cannot write the file.

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return $deps;

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}

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// Enqueue ajax cache as definitions dependency.

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$handle = 'et-ajax-cache';

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$deps[] = $handle;

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wp_register_script( $handle, $this->get_url(), array(), ET_BUILDER_VERSION );

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return $deps;

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}

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/**

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* Load cache.

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* @since 4.0.10

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* @return void

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public function load() {

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if ( is_array( $this->_cache ) ) {

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// Cache was already loaded

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return;

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}

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$this->_cache = get_transient( $this->_transient );

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if ( ! is_array( $this->_cache ) ) {

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$this->_cache = array();

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$this->delete_file();

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}

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}

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/**

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* Save cache.

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* @since 4.0.10

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* @return void

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public function save() {

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// Ensure cache is loaded

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$this->load();

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if ( $this->_dirty ) {

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set_transient( $this->_transient, $this->_cache );

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$this->delete_file();

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}

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}

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/**

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* Write cache file.

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* @since 4.0.10

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* @return void

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public function write_file() {

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if ( $this->is_empty() ) {

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return false;

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}

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$file = $this->get_file_name();

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$cache = '';

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foreach ( $this->_cache as $key => $value ) {

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$cache = sprintf( '"%s":%s,', $key, $value );

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}

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$cache = sprintf( '{"ajaxCache":{%s}}', rtrim( $cache, ',' ) );

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$cache = sprintf( 'window.ETBuilderBackend=jQuery.extend(true,%s,window.ETBuilderBackend)', $cache );

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et_()->WPFS()->put_contents( $file, $cache );

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return $this->file_exists();

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}

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/**

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* Delete cache file.

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* @since 4.0.10

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* @return void

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public function delete_file() {

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if ( $this->file_exists() ) {

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et_()->WPFS()->delete( $this->get_file_name() );

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}

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}

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/**

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* Set cache key.

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* @since 4.0.10

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* @param string $key Cache key.

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* @param string $value Cache value.

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* @return void

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public function set( $key, $content ) {

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$this->load();

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$this->_cache[ $key ] = wp_json_encode( $content );

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$this->_dirty = true;

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}

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/**

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* Unset cache key.

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* @since 4.0.10

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* @param string $key Cache key.

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* @return void

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public function unset_( $key ) {

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$this->load();

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if ( isset( $this->_cache[ $key ] ) ) {

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unset( $this->_cache[ $key ] );

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$this->_dirty = true;

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}

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}

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/**

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* Clear cache.

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* @return void

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public function clear() {

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delete_transient( $this->_transient );

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}

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/**

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* Get cache file name.

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* @since 4.0.10

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* @return string.

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public function get_file_name() {

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// Per language Cache due to some data being localized.

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$lang = is_admin() || et_fb_is_enabled() ? get_user_locale() : get_locale();

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$lang = trim( sanitize_file_name( $lang ), '.' );

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$prefix = 'ajax';

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$cache = et_()->path( et_core_cache_dir()->path, $lang );

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$files = glob( "{$cache}/{$prefix}-*.js" );

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$exists = is_array( $files ) && $files;

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if ( $exists ) {

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return $files[0];

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}

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wp_mkdir_p( $cache );

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// Create uniq filename

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$uniq = str_replace( '.', '', (string) microtime( true ) );

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$file = "{$cache}/{$prefix}-{$uniq}.js";

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return et_()->WPFS()->is_writable( dirname( $file ) ) ? $file : false;

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}

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/**

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* Get cache url.

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* @since 4.0.10

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* @return void

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public function get_url() {

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$file = $this->get_file_name();

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$lang = basename( dirname( $file ) );

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$name = basename( $file );

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return et_()->path( et_core_cache_dir()->url, $lang, $name );

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}

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/**

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* Get the class instance.

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* @since 4.0.10

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* @return ET_Builder_Ajax_Cache

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public static function instance() {

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if ( ! self::$_instance ) {

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self::$_instance = new self;

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}

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return self::$_instance;

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}

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}

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ET_Builder_Ajax_Cache::instance();

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