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class-wp-customize-nav-menu-item-setting.php (27378B)

---

 <?php
 /**
  * Customize API: WP_Customize_Nav_Menu_Item_Setting class
  *
  * @package WordPress
  * @subpackage Customize
  * @since 4.4.0
  */
 
 /**
  * Customize Setting to represent a nav_menu.
  *
  * Subclass of WP_Customize_Setting to represent a nav_menu taxonomy term, and
  * the IDs for the nav_menu_items associated with the nav menu.
  *
  * @since 4.3.0
  *
  * @see WP_Customize_Setting
  */
 class WP_Customize_Nav_Menu_Item_Setting extends WP_Customize_Setting {
 
 	const ID_PATTERN = '/^nav_menu_item\[(?P<id>-?\d+)\]$/';
 
 	const POST_TYPE = 'nav_menu_item';
 
 	const TYPE = 'nav_menu_item';
 
 	/**
 	 * Setting type.
 	 *
 	 * @since 4.3.0
 	 * @var string
 	 */
 	public $type = self::TYPE;
 
 	/**
 	 * Default setting value.
 	 *
 	 * @since 4.3.0
 	 * @var array
 	 *
 	 * @see wp_setup_nav_menu_item()
 	 */
 	public $default = array(
 		// The $menu_item_data for wp_update_nav_menu_item().
 		'object_id'        => 0,
 		'object'           => '', // Taxonomy name.
 		'menu_item_parent' => 0, // A.K.A. menu-item-parent-id; note that post_parent is different, and not included.
 		'position'         => 0, // A.K.A. menu_order.
 		'type'             => 'custom', // Note that type_label is not included here.
 		'title'            => '',
 		'url'              => '',
 		'target'           => '',
 		'attr_title'       => '',
 		'description'      => '',
 		'classes'          => '',
 		'xfn'              => '',
 		'status'           => 'publish',
 		'original_title'   => '',
 		'nav_menu_term_id' => 0, // This will be supplied as the $menu_id arg for wp_update_nav_menu_item().
 		'_invalid'         => false,
 	);
 
 	/**
 	 * Default transport.
 	 *
 	 * @since 4.3.0
 	 * @since 4.5.0 Default changed to 'refresh'
 	 * @var string
 	 */
 	public $transport = 'refresh';
 
 	/**
 	 * The post ID represented by this setting instance. This is the db_id.
 	 *
 	 * A negative value represents a placeholder ID for a new menu not yet saved.
 	 *
 	 * @since 4.3.0
 	 * @var int
 	 */
 	public $post_id;
 
 	/**
 	 * Storage of pre-setup menu item to prevent wasted calls to wp_setup_nav_menu_item().
 	 *
 	 * @since 4.3.0
 	 * @var array|null
 	 */
 	protected $value;
 
 	/**
 	 * Previous (placeholder) post ID used before creating a new menu item.
 	 *
 	 * This value will be exported to JS via the customize_save_response filter
 	 * so that JavaScript can update the settings to refer to the newly-assigned
 	 * post ID. This value is always negative to indicate it does not refer to
 	 * a real post.
 	 *
 	 * @since 4.3.0
 	 * @var int
 	 *
 	 * @see WP_Customize_Nav_Menu_Item_Setting::update()
 	 * @see WP_Customize_Nav_Menu_Item_Setting::amend_customize_save_response()
 	 */
 	public $previous_post_id;
 
 	/**
 	 * When previewing or updating a menu item, this stores the previous nav_menu_term_id
 	 * which ensures that we can apply the proper filters.
 	 *
 	 * @since 4.3.0
 	 * @var int
 	 */
 	public $original_nav_menu_term_id;
 
 	/**
 	 * Whether or not update() was called.
 	 *
 	 * @since 4.3.0
 	 * @var bool
 	 */
 	protected $is_updated = false;
 
 	/**
 	 * Status for calling the update method, used in customize_save_response filter.
 	 *
 	 * See {@see 'customize_save_response'}.
 	 *
 	 * When status is inserted, the placeholder post ID is stored in $previous_post_id.
 	 * When status is error, the error is stored in $update_error.
 	 *
 	 * @since 4.3.0
 	 * @var string updated|inserted|deleted|error
 	 *
 	 * @see WP_Customize_Nav_Menu_Item_Setting::update()
 	 * @see WP_Customize_Nav_Menu_Item_Setting::amend_customize_save_response()
 	 */
 	public $update_status;
 
 	/**
 	 * Any error object returned by wp_update_nav_menu_item() when setting is updated.
 	 *
 	 * @since 4.3.0
 	 * @var WP_Error
 	 *
 	 * @see WP_Customize_Nav_Menu_Item_Setting::update()
 	 * @see WP_Customize_Nav_Menu_Item_Setting::amend_customize_save_response()
 	 */
 	public $update_error;
 
 	/**
 	 * Constructor.
 	 *
 	 * Any supplied $args override class property defaults.
 	 *
 	 * @since 4.3.0
 	 *
 	 * @throws Exception If $id is not valid for this setting type.
 	 *
 	 * @param WP_Customize_Manager $manager Customizer bootstrap instance.
 	 * @param string               $id      A specific ID of the setting.
 	 *                                      Can be a theme mod or option name.
 	 * @param array                $args    Optional. Setting arguments.
 	 */
 	public function __construct( WP_Customize_Manager $manager, $id, array $args = array() ) {
 		if ( empty( $manager->nav_menus ) ) {
 			throw new Exception( 'Expected WP_Customize_Manager::$nav_menus to be set.' );
 		}
 
 		if ( ! preg_match( self::ID_PATTERN, $id, $matches ) ) {
 			throw new Exception( "Illegal widget setting ID: $id" );
 		}
 
 		$this->post_id = (int) $matches['id'];
 		add_action( 'wp_update_nav_menu_item', array( $this, 'flush_cached_value' ), 10, 2 );
 
 		parent::__construct( $manager, $id, $args );
 
 		// Ensure that an initially-supplied value is valid.
 		if ( isset( $this->value ) ) {
 			$this->populate_value();
 			foreach ( array_diff( array_keys( $this->default ), array_keys( $this->value ) ) as $missing ) {
 				throw new Exception( "Supplied nav_menu_item value missing property: $missing" );
 			}
 		}
 
 	}
 
 	/**
 	 * Clear the cached value when this nav menu item is updated.
 	 *
 	 * @since 4.3.0
 	 *
 	 * @param int $menu_id       The term ID for the menu.
 	 * @param int $menu_item_id  The post ID for the menu item.
 	 */
 	public function flush_cached_value( $menu_id, $menu_item_id ) {
 		unset( $menu_id );
 		if ( $menu_item_id === $this->post_id ) {
 			$this->value = null;
 		}
 	}
 
 	/**
 	 * Get the instance data for a given nav_menu_item setting.
 	 *
 	 * @since 4.3.0
 	 *
 	 * @see wp_setup_nav_menu_item()
 	 *
 	 * @return array|false Instance data array, or false if the item is marked for deletion.
 	 */
 	public function value() {
 		if ( $this->is_previewed && get_current_blog_id() === $this->_previewed_blog_id ) {
 			$undefined  = new stdClass(); // Symbol.
 			$post_value = $this->post_value( $undefined );
 
 			if ( $undefined === $post_value ) {
 				$value = $this->_original_value;
 			} else {
 				$value = $post_value;
 			}
 			if ( ! empty( $value ) && empty( $value['original_title'] ) ) {
 				$value['original_title'] = $this->get_original_title( (object) $value );
 			}
 		} elseif ( isset( $this->value ) ) {
 			$value = $this->value;
 		} else {
 			$value = false;
 
 			// Note that a ID of less than one indicates a nav_menu not yet inserted.
 			if ( $this->post_id > 0 ) {
 				$post = get_post( $this->post_id );
 				if ( $post && self::POST_TYPE === $post->post_type ) {
 					$is_title_empty = empty( $post->post_title );
 					$value          = (array) wp_setup_nav_menu_item( $post );
 					if ( $is_title_empty ) {
 						$value['title'] = '';
 					}
 				}
 			}
 
 			if ( ! is_array( $value ) ) {
 				$value = $this->default;
 			}
 
 			// Cache the value for future calls to avoid having to re-call wp_setup_nav_menu_item().
 			$this->value = $value;
 			$this->populate_value();
 			$value = $this->value;
 		}
 
 		if ( ! empty( $value ) && empty( $value['type_label'] ) ) {
 			$value['type_label'] = $this->get_type_label( (object) $value );
 		}
 
 		return $value;
 	}
 
 	/**
 	 * Get original title.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @param object $item Nav menu item.
 	 * @return string The original title.
 	 */
 	protected function get_original_title( $item ) {
 		$original_title = '';
 		if ( 'post_type' === $item->type && ! empty( $item->object_id ) ) {
 			$original_object = get_post( $item->object_id );
 			if ( $original_object ) {
 				/** This filter is documented in wp-includes/post-template.php */
 				$original_title = apply_filters( 'the_title', $original_object->post_title, $original_object->ID );
 
 				if ( '' === $original_title ) {
 					/* translators: %d: ID of a post. */
 					$original_title = sprintf( __( '#%d (no title)' ), $original_object->ID );
 				}
 			}
 		} elseif ( 'taxonomy' === $item->type && ! empty( $item->object_id ) ) {
 			$original_term_title = get_term_field( 'name', $item->object_id, $item->object, 'raw' );
 			if ( ! is_wp_error( $original_term_title ) ) {
 				$original_title = $original_term_title;
 			}
 		} elseif ( 'post_type_archive' === $item->type ) {
 			$original_object = get_post_type_object( $item->object );
 			if ( $original_object ) {
 				$original_title = $original_object->labels->archives;
 			}
 		}
 		$original_title = html_entity_decode( $original_title, ENT_QUOTES, get_bloginfo( 'charset' ) );
 		return $original_title;
 	}
 
 	/**
 	 * Get type label.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @param object $item Nav menu item.
 	 * @return string The type label.
 	 */
 	protected function get_type_label( $item ) {
 		if ( 'post_type' === $item->type ) {
 			$object = get_post_type_object( $item->object );
 			if ( $object ) {
 				$type_label = $object->labels->singular_name;
 			} else {
 				$type_label = $item->object;
 			}
 		} elseif ( 'taxonomy' === $item->type ) {
 			$object = get_taxonomy( $item->object );
 			if ( $object ) {
 				$type_label = $object->labels->singular_name;
 			} else {
 				$type_label = $item->object;
 			}
 		} elseif ( 'post_type_archive' === $item->type ) {
 			$type_label = __( 'Post Type Archive' );
 		} else {
 			$type_label = __( 'Custom Link' );
 		}
 		return $type_label;
 	}
 
 	/**
 	 * Ensure that the value is fully populated with the necessary properties.
 	 *
 	 * Translates some properties added by wp_setup_nav_menu_item() and removes others.
 	 *
 	 * @since 4.3.0
 	 *
 	 * @see WP_Customize_Nav_Menu_Item_Setting::value()
 	 */
 	protected function populate_value() {
 		if ( ! is_array( $this->value ) ) {
 			return;
 		}
 
 		if ( isset( $this->value['menu_order'] ) ) {
 			$this->value['position'] = $this->value['menu_order'];
 			unset( $this->value['menu_order'] );
 		}
 		if ( isset( $this->value['post_status'] ) ) {
 			$this->value['status'] = $this->value['post_status'];
 			unset( $this->value['post_status'] );
 		}
 
 		if ( ! isset( $this->value['original_title'] ) ) {
 			$this->value['original_title'] = $this->get_original_title( (object) $this->value );
 		}
 
 		if ( ! isset( $this->value['nav_menu_term_id'] ) && $this->post_id > 0 ) {
 			$menus = wp_get_post_terms(
 				$this->post_id,
 				WP_Customize_Nav_Menu_Setting::TAXONOMY,
 				array(
 					'fields' => 'ids',
 				)
 			);
 			if ( ! empty( $menus ) ) {
 				$this->value['nav_menu_term_id'] = array_shift( $menus );
 			} else {
 				$this->value['nav_menu_term_id'] = 0;
 			}
 		}
 
 		foreach ( array( 'object_id', 'menu_item_parent', 'nav_menu_term_id' ) as $key ) {
 			if ( ! is_int( $this->value[ $key ] ) ) {
 				$this->value[ $key ] = (int) $this->value[ $key ];
 			}
 		}
 		foreach ( array( 'classes', 'xfn' ) as $key ) {
 			if ( is_array( $this->value[ $key ] ) ) {
 				$this->value[ $key ] = implode( ' ', $this->value[ $key ] );
 			}
 		}
 
 		if ( ! isset( $this->value['title'] ) ) {
 			$this->value['title'] = '';
 		}
 
 		if ( ! isset( $this->value['_invalid'] ) ) {
 			$this->value['_invalid'] = false;
 			$is_known_invalid        = (
 				( ( 'post_type' === $this->value['type'] || 'post_type_archive' === $this->value['type'] ) && ! post_type_exists( $this->value['object'] ) )
 				||
 				( 'taxonomy' === $this->value['type'] && ! taxonomy_exists( $this->value['object'] ) )
 			);
 			if ( $is_known_invalid ) {
 				$this->value['_invalid'] = true;
 			}
 		}
 
 		// Remove remaining properties available on a setup nav_menu_item post object which aren't relevant to the setting value.
 		$irrelevant_properties = array(
 			'ID',
 			'comment_count',
 			'comment_status',
 			'db_id',
 			'filter',
 			'guid',
 			'ping_status',
 			'pinged',
 			'post_author',
 			'post_content',
 			'post_content_filtered',
 			'post_date',
 			'post_date_gmt',
 			'post_excerpt',
 			'post_mime_type',
 			'post_modified',
 			'post_modified_gmt',
 			'post_name',
 			'post_parent',
 			'post_password',
 			'post_title',
 			'post_type',
 			'to_ping',
 		);
 		foreach ( $irrelevant_properties as $property ) {
 			unset( $this->value[ $property ] );
 		}
 	}
 
 	/**
 	 * Handle previewing the setting.
 	 *
 	 * @since 4.3.0
 	 * @since 4.4.0 Added boolean return value.
 	 *
 	 * @see WP_Customize_Manager::post_value()
 	 *
 	 * @return bool False if method short-circuited due to no-op.
 	 */
 	public function preview() {
 		if ( $this->is_previewed ) {
 			return false;
 		}
 
 		$undefined      = new stdClass();
 		$is_placeholder = ( $this->post_id < 0 );
 		$is_dirty       = ( $undefined !== $this->post_value( $undefined ) );
 		if ( ! $is_placeholder && ! $is_dirty ) {
 			return false;
 		}
 
 		$this->is_previewed              = true;
 		$this->_original_value           = $this->value();
 		$this->original_nav_menu_term_id = $this->_original_value['nav_menu_term_id'];
 		$this->_previewed_blog_id        = get_current_blog_id();
 
 		add_filter( 'wp_get_nav_menu_items', array( $this, 'filter_wp_get_nav_menu_items' ), 10, 3 );
 
 		$sort_callback = array( __CLASS__, 'sort_wp_get_nav_menu_items' );
 		if ( ! has_filter( 'wp_get_nav_menu_items', $sort_callback ) ) {
 			add_filter( 'wp_get_nav_menu_items', array( __CLASS__, 'sort_wp_get_nav_menu_items' ), 1000, 3 );
 		}
 
 		// @todo Add get_post_metadata filters for plugins to add their data.
 
 		return true;
 	}
 
 	/**
 	 * Filters the wp_get_nav_menu_items() result to supply the previewed menu items.
 	 *
 	 * @since 4.3.0
 	 *
 	 * @see wp_get_nav_menu_items()
 	 *
 	 * @param WP_Post[] $items An array of menu item post objects.
 	 * @param WP_Term   $menu  The menu object.
 	 * @param array     $args  An array of arguments used to retrieve menu item objects.
 	 * @return WP_Post[] Array of menu item objects.
 	 */
 	public function filter_wp_get_nav_menu_items( $items, $menu, $args ) {
 		$this_item                = $this->value();
 		$current_nav_menu_term_id = null;
 		if ( isset( $this_item['nav_menu_term_id'] ) ) {
 			$current_nav_menu_term_id = $this_item['nav_menu_term_id'];
 			unset( $this_item['nav_menu_term_id'] );
 		}
 
 		$should_filter = (
 			$menu->term_id === $this->original_nav_menu_term_id
 			||
 			$menu->term_id === $current_nav_menu_term_id
 		);
 		if ( ! $should_filter ) {
 			return $items;
 		}
 
 		// Handle deleted menu item, or menu item moved to another menu.
 		$should_remove = (
 			false === $this_item
 			||
 			( isset( $this_item['_invalid'] ) && true === $this_item['_invalid'] )
 			||
 			(
 				$this->original_nav_menu_term_id === $menu->term_id
 				&&
 				$current_nav_menu_term_id !== $this->original_nav_menu_term_id
 			)
 		);
 		if ( $should_remove ) {
 			$filtered_items = array();
 			foreach ( $items as $item ) {
 				if ( $item->db_id !== $this->post_id ) {
 					$filtered_items[] = $item;
 				}
 			}
 			return $filtered_items;
 		}
 
 		$mutated       = false;
 		$should_update = (
 			is_array( $this_item )
 			&&
 			$current_nav_menu_term_id === $menu->term_id
 		);
 		if ( $should_update ) {
 			foreach ( $items as $item ) {
 				if ( $item->db_id === $this->post_id ) {
 					foreach ( get_object_vars( $this->value_as_wp_post_nav_menu_item() ) as $key => $value ) {
 						$item->$key = $value;
 					}
 					$mutated = true;
 				}
 			}
 
 			// Not found so we have to append it..
 			if ( ! $mutated ) {
 				$items[] = $this->value_as_wp_post_nav_menu_item();
 			}
 		}
 
 		return $items;
 	}
 
 	/**
 	 * Re-apply the tail logic also applied on $items by wp_get_nav_menu_items().
 	 *
 	 * @since 4.3.0
 	 *
 	 * @see wp_get_nav_menu_items()
 	 *
 	 * @param WP_Post[] $items An array of menu item post objects.
 	 * @param WP_Term   $menu  The menu object.
 	 * @param array     $args  An array of arguments used to retrieve menu item objects.
 	 * @return WP_Post[] Array of menu item objects.
 	 */
 	public static function sort_wp_get_nav_menu_items( $items, $menu, $args ) {
 		// @todo We should probably re-apply some constraints imposed by $args.
 		unset( $args['include'] );
 
 		// Remove invalid items only in front end.
 		if ( ! is_admin() ) {
 			$items = array_filter( $items, '_is_valid_nav_menu_item' );
 		}
 
 		if ( ARRAY_A === $args['output'] ) {
 			$items = wp_list_sort(
 				$items,
 				array(
 					$args['output_key'] => 'ASC',
 				)
 			);
 			$i     = 1;
 
 			foreach ( $items as $k => $item ) {
 				$items[ $k ]->{$args['output_key']} = $i++;
 			}
 		}
 
 		return $items;
 	}
 
 	/**
 	 * Get the value emulated into a WP_Post and set up as a nav_menu_item.
 	 *
 	 * @since 4.3.0
 	 *
 	 * @return WP_Post With wp_setup_nav_menu_item() applied.
 	 */
 	public function value_as_wp_post_nav_menu_item() {
 		$item = (object) $this->value();
 		unset( $item->nav_menu_term_id );
 
 		$item->post_status = $item->status;
 		unset( $item->status );
 
 		$item->post_type  = 'nav_menu_item';
 		$item->menu_order = $item->position;
 		unset( $item->position );
 
 		if ( empty( $item->original_title ) ) {
 			$item->original_title = $this->get_original_title( $item );
 		}
 		if ( empty( $item->title ) && ! empty( $item->original_title ) ) {
 			$item->title = $item->original_title;
 		}
 		if ( $item->title ) {
 			$item->post_title = $item->title;
 		}
 
 		// 'classes' should be an array, as in wp_setup_nav_menu_item().
 		if ( isset( $item->classes ) && is_scalar( $item->classes ) ) {
 			$item->classes = explode( ' ', $item->classes );
 		}
 
 		$item->ID    = $this->post_id;
 		$item->db_id = $this->post_id;
 		$post        = new WP_Post( (object) $item );
 
 		if ( empty( $post->post_author ) ) {
 			$post->post_author = get_current_user_id();
 		}
 
 		if ( ! isset( $post->type_label ) ) {
 			$post->type_label = $this->get_type_label( $post );
 		}
 
 		// Ensure nav menu item URL is set according to linked object.
 		if ( 'post_type' === $post->type && ! empty( $post->object_id ) ) {
 			$post->url = get_permalink( $post->object_id );
 		} elseif ( 'taxonomy' === $post->type && ! empty( $post->object ) && ! empty( $post->object_id ) ) {
 			$post->url = get_term_link( (int) $post->object_id, $post->object );
 		} elseif ( 'post_type_archive' === $post->type && ! empty( $post->object ) ) {
 			$post->url = get_post_type_archive_link( $post->object );
 		}
 		if ( is_wp_error( $post->url ) ) {
 			$post->url = '';
 		}
 
 		/** This filter is documented in wp-includes/nav-menu.php */
 		$post->attr_title = apply_filters( 'nav_menu_attr_title', $post->attr_title );
 
 		/** This filter is documented in wp-includes/nav-menu.php */
 		$post->description = apply_filters( 'nav_menu_description', wp_trim_words( $post->description, 200 ) );
 
 		/** This filter is documented in wp-includes/nav-menu.php */
 		$post = apply_filters( 'wp_setup_nav_menu_item', $post );
 
 		return $post;
 	}
 
 	/**
 	 * Sanitize an input.
 	 *
 	 * Note that parent::sanitize() erroneously does wp_unslash() on $value, but
 	 * we remove that in this override.
 	 *
 	 * @since 4.3.0
 	 *
 	 * @param array $menu_item_value The value to sanitize.
 	 * @return array|false|null|WP_Error Null or WP_Error if an input isn't valid. False if it is marked for deletion.
 	 *                                   Otherwise the sanitized value.
 	 */
 	public function sanitize( $menu_item_value ) {
 		// Menu is marked for deletion.
 		if ( false === $menu_item_value ) {
 			return $menu_item_value;
 		}
 
 		// Invalid.
 		if ( ! is_array( $menu_item_value ) ) {
 			return null;
 		}
 
 		$default                     = array(
 			'object_id'        => 0,
 			'object'           => '',
 			'menu_item_parent' => 0,
 			'position'         => 0,
 			'type'             => 'custom',
 			'title'            => '',
 			'url'              => '',
 			'target'           => '',
 			'attr_title'       => '',
 			'description'      => '',
 			'classes'          => '',
 			'xfn'              => '',
 			'status'           => 'publish',
 			'original_title'   => '',
 			'nav_menu_term_id' => 0,
 			'_invalid'         => false,
 		);
 		$menu_item_value             = array_merge( $default, $menu_item_value );
 		$menu_item_value             = wp_array_slice_assoc( $menu_item_value, array_keys( $default ) );
 		$menu_item_value['position'] = (int) $menu_item_value['position'];
 
 		foreach ( array( 'object_id', 'menu_item_parent', 'nav_menu_term_id' ) as $key ) {
 			// Note we need to allow negative-integer IDs for previewed objects not inserted yet.
 			$menu_item_value[ $key ] = (int) $menu_item_value[ $key ];
 		}
 
 		foreach ( array( 'type', 'object', 'target' ) as $key ) {
 			$menu_item_value[ $key ] = sanitize_key( $menu_item_value[ $key ] );
 		}
 
 		foreach ( array( 'xfn', 'classes' ) as $key ) {
 			$value = $menu_item_value[ $key ];
 			if ( ! is_array( $value ) ) {
 				$value = explode( ' ', $value );
 			}
 			$menu_item_value[ $key ] = implode( ' ', array_map( 'sanitize_html_class', $value ) );
 		}
 
 		$menu_item_value['original_title'] = sanitize_text_field( $menu_item_value['original_title'] );
 
 		// Apply the same filters as when calling wp_insert_post().
 
 		/** This filter is documented in wp-includes/post.php */
 		$menu_item_value['title'] = wp_unslash( apply_filters( 'title_save_pre', wp_slash( $menu_item_value['title'] ) ) );
 
 		/** This filter is documented in wp-includes/post.php */
 		$menu_item_value['attr_title'] = wp_unslash( apply_filters( 'excerpt_save_pre', wp_slash( $menu_item_value['attr_title'] ) ) );
 
 		/** This filter is documented in wp-includes/post.php */
 		$menu_item_value['description'] = wp_unslash( apply_filters( 'content_save_pre', wp_slash( $menu_item_value['description'] ) ) );
 
 		if ( '' !== $menu_item_value['url'] ) {
 			$menu_item_value['url'] = esc_url_raw( $menu_item_value['url'] );
 			if ( '' === $menu_item_value['url'] ) {
 				return new WP_Error( 'invalid_url', __( 'Invalid URL.' ) ); // Fail sanitization if URL is invalid.
 			}
 		}
 		if ( 'publish' !== $menu_item_value['status'] ) {
 			$menu_item_value['status'] = 'draft';
 		}
 
 		$menu_item_value['_invalid'] = (bool) $menu_item_value['_invalid'];
 
 		/** This filter is documented in wp-includes/class-wp-customize-setting.php */
 		return apply_filters( "customize_sanitize_{$this->id}", $menu_item_value, $this );
 	}
 
 	/**
 	 * Creates/updates the nav_menu_item post for this setting.
 	 *
 	 * Any created menu items will have their assigned post IDs exported to the client
 	 * via the {@see 'customize_save_response'} filter. Likewise, any errors will be
 	 * exported to the client via the customize_save_response() filter.
 	 *
 	 * To delete a menu, the client can send false as the value.
 	 *
 	 * @since 4.3.0
 	 *
 	 * @see wp_update_nav_menu_item()
 	 *
 	 * @param array|false $value The menu item array to update. If false, then the menu item will be deleted
 	 *                           entirely. See WP_Customize_Nav_Menu_Item_Setting::$default for what the value
 	 *                           should consist of.
 	 * @return null|void
 	 */
 	protected function update( $value ) {
 		if ( $this->is_updated ) {
 			return;
 		}
 
 		$this->is_updated = true;
 		$is_placeholder   = ( $this->post_id < 0 );
 		$is_delete        = ( false === $value );
 
 		// Update the cached value.
 		$this->value = $value;
 
 		add_filter( 'customize_save_response', array( $this, 'amend_customize_save_response' ) );
 
 		if ( $is_delete ) {
 			// If the current setting post is a placeholder, a delete request is a no-op.
 			if ( $is_placeholder ) {
 				$this->update_status = 'deleted';
 			} else {
 				$r = wp_delete_post( $this->post_id, true );
 
 				if ( false === $r ) {
 					$this->update_error  = new WP_Error( 'delete_failure' );
 					$this->update_status = 'error';
 				} else {
 					$this->update_status = 'deleted';
 				}
 				// @todo send back the IDs for all associated nav menu items deleted, so these settings (and controls) can be removed from Customizer?
 			}
 		} else {
 
 			// Handle saving menu items for menus that are being newly-created.
 			if ( $value['nav_menu_term_id'] < 0 ) {
 				$nav_menu_setting_id = sprintf( 'nav_menu[%s]', $value['nav_menu_term_id'] );
 				$nav_menu_setting    = $this->manager->get_setting( $nav_menu_setting_id );
 
 				if ( ! $nav_menu_setting || ! ( $nav_menu_setting instanceof WP_Customize_Nav_Menu_Setting ) ) {
 					$this->update_status = 'error';
 					$this->update_error  = new WP_Error( 'unexpected_nav_menu_setting' );
 					return;
 				}
 
 				if ( false === $nav_menu_setting->save() ) {
 					$this->update_status = 'error';
 					$this->update_error  = new WP_Error( 'nav_menu_setting_failure' );
 					return;
 				}
 
 				if ( (int) $value['nav_menu_term_id'] !== $nav_menu_setting->previous_term_id ) {
 					$this->update_status = 'error';
 					$this->update_error  = new WP_Error( 'unexpected_previous_term_id' );
 					return;
 				}
 
 				$value['nav_menu_term_id'] = $nav_menu_setting->term_id;
 			}
 
 			// Handle saving a nav menu item that is a child of a nav menu item being newly-created.
 			if ( $value['menu_item_parent'] < 0 ) {
 				$parent_nav_menu_item_setting_id = sprintf( 'nav_menu_item[%s]', $value['menu_item_parent'] );
 				$parent_nav_menu_item_setting    = $this->manager->get_setting( $parent_nav_menu_item_setting_id );
 
 				if ( ! $parent_nav_menu_item_setting || ! ( $parent_nav_menu_item_setting instanceof WP_Customize_Nav_Menu_Item_Setting ) ) {
 					$this->update_status = 'error';
 					$this->update_error  = new WP_Error( 'unexpected_nav_menu_item_setting' );
 					return;
 				}
 
 				if ( false === $parent_nav_menu_item_setting->save() ) {
 					$this->update_status = 'error';
 					$this->update_error  = new WP_Error( 'nav_menu_item_setting_failure' );
 					return;
 				}
 
 				if ( (int) $value['menu_item_parent'] !== $parent_nav_menu_item_setting->previous_post_id ) {
 					$this->update_status = 'error';
 					$this->update_error  = new WP_Error( 'unexpected_previous_post_id' );
 					return;
 				}
 
 				$value['menu_item_parent'] = $parent_nav_menu_item_setting->post_id;
 			}
 
 			// Insert or update menu.
 			$menu_item_data = array(
 				'menu-item-object-id'   => $value['object_id'],
 				'menu-item-object'      => $value['object'],
 				'menu-item-parent-id'   => $value['menu_item_parent'],
 				'menu-item-position'    => $value['position'],
 				'menu-item-type'        => $value['type'],
 				'menu-item-title'       => $value['title'],
 				'menu-item-url'         => $value['url'],
 				'menu-item-description' => $value['description'],
 				'menu-item-attr-title'  => $value['attr_title'],
 				'menu-item-target'      => $value['target'],
 				'menu-item-classes'     => $value['classes'],
 				'menu-item-xfn'         => $value['xfn'],
 				'menu-item-status'      => $value['status'],
 			);
 
 			$r = wp_update_nav_menu_item(
 				$value['nav_menu_term_id'],
 				$is_placeholder ? 0 : $this->post_id,
 				wp_slash( $menu_item_data )
 			);
 
 			if ( is_wp_error( $r ) ) {
 				$this->update_status = 'error';
 				$this->update_error  = $r;
 			} else {
 				if ( $is_placeholder ) {
 					$this->previous_post_id = $this->post_id;
 					$this->post_id          = $r;
 					$this->update_status    = 'inserted';
 				} else {
 					$this->update_status = 'updated';
 				}
 			}
 		}
 
 	}
 
 	/**
 	 * Export data for the JS client.
 	 *
 	 * @since 4.3.0
 	 *
 	 * @see WP_Customize_Nav_Menu_Item_Setting::update()
 	 *
 	 * @param array $data Additional information passed back to the 'saved' event on `wp.customize`.
 	 * @return array Save response data.
 	 */
 	public function amend_customize_save_response( $data ) {
 		if ( ! isset( $data['nav_menu_item_updates'] ) ) {
 			$data['nav_menu_item_updates'] = array();
 		}
 
 		$data['nav_menu_item_updates'][] = array(
 			'post_id'          => $this->post_id,
 			'previous_post_id' => $this->previous_post_id,
 			'error'            => $this->update_error ? $this->update_error->get_error_code() : null,
 			'status'           => $this->update_status,
 		);
 		return $data;
 	}
 }