<?php
/**
* REST API: WP_REST_Widgets_Controller class
*
* @package WordPress
* @subpackage REST_API
* @since 5.8.0
*/
/**
* Core class to access widgets via the REST API.
*
* @since 5.8.0
*
* @see WP_REST_Controller
*/
class WP_REST_Widgets_Controller extends WP_REST_Controller {
/**
* Tracks whether {@see retrieve_widgets()} has been called in the current request.
*
* @since 5.9.0
* @var bool
*/
protected $widgets_retrieved = false;
/**
* Whether the controller supports batching.
*
* @since 5.9.0
* @var array
*/
protected $allow_batch = array( 'v1' => true );
/**
* Widgets controller constructor.
*
* @since 5.8.0
*/
public function __construct() {
$this->namespace = 'wp/v2';
$this->rest_base = 'widgets';
}
/**
* Registers the widget routes for the controller.
*
* @since 5.8.0
*/
public function register_routes() {
register_rest_route(
$this->namespace,
$this->rest_base,
array(
array(
'methods' => WP_REST_Server::READABLE,
'callback' => array( $this, 'get_items' ),
'permission_callback' => array( $this, 'get_items_permissions_check' ),
'args' => $this->get_collection_params(),
),
array(
'methods' => WP_REST_Server::CREATABLE,
'callback' => array( $this, 'create_item' ),
'permission_callback' => array( $this, 'create_item_permissions_check' ),
'args' => $this->get_endpoint_args_for_item_schema(),
),
'allow_batch' => $this->allow_batch,
'schema' => array( $this, 'get_public_item_schema' ),
)
);
register_rest_route(
$this->namespace,
$this->rest_base . '/(?P<id>[\w\-]+)',
array(
array(
'methods' => WP_REST_Server::READABLE,
'callback' => array( $this, 'get_item' ),
'permission_callback' => array( $this, 'get_item_permissions_check' ),
'args' => array(
'context' => $this->get_context_param( array( 'default' => 'view' ) ),
),
),
array(
'methods' => WP_REST_Server::EDITABLE,
'callback' => array( $this, 'update_item' ),
'permission_callback' => array( $this, 'update_item_permissions_check' ),
'args' => $this->get_endpoint_args_for_item_schema( WP_REST_Server::EDITABLE ),
),
array(
'methods' => WP_REST_Server::DELETABLE,
'callback' => array( $this, 'delete_item' ),
'permission_callback' => array( $this, 'delete_item_permissions_check' ),
'args' => array(
'force' => array(
'description' => __( 'Whether to force removal of the widget, or move it to the inactive sidebar.' ),
'type' => 'boolean',
),
),
),
'allow_batch' => $this->allow_batch,
'schema' => array( $this, 'get_public_item_schema' ),
)
);
}
/**
* Checks if a given request has access to get widgets.
*
* @since 5.8.0
*
* @param WP_REST_Request $request Full details about the request.
* @return true|WP_Error True if the request has read access, WP_Error object otherwise.
*/
public function get_items_permissions_check( $request ) {
$this->retrieve_widgets();
if ( isset( $request['sidebar'] ) && $this->check_read_sidebar_permission( $request['sidebar'] ) ) {
return true;
}
foreach ( wp_get_sidebars_widgets() as $sidebar_id => $widget_ids ) {
if ( $this->check_read_sidebar_permission( $sidebar_id ) ) {
return true;
}
}
return $this->permissions_check( $request );
}
/**
* Retrieves a collection of widgets.
*
* @since 5.8.0
*
* @param WP_REST_Request $request Full details about the request.
* @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
*/
public function get_items( $request ) {
$this->retrieve_widgets();
$prepared = array();
$permissions_check = $this->permissions_check( $request );
foreach ( wp_get_sidebars_widgets() as $sidebar_id => $widget_ids ) {
if ( isset( $request['sidebar'] ) && $sidebar_id !== $request['sidebar'] ) {
continue;
}
if ( is_wp_error( $permissions_check ) && ! $this->check_read_sidebar_permission( $sidebar_id ) ) {
continue;
}
foreach ( $widget_ids as $widget_id ) {
$response = $this->prepare_item_for_response( compact( 'sidebar_id', 'widget_id' ), $request );
if ( ! is_wp_error( $response ) ) {
$prepared[] = $this->prepare_response_for_collection( $response );
}
}
}
return new WP_REST_Response( $prepared );
}
/**
* Checks if a given request has access to get a widget.
*
* @since 5.8.0
*
* @param WP_REST_Request $request Full details about the request.
* @return true|WP_Error True if the request has read access, WP_Error object otherwise.
*/
public function get_item_permissions_check( $request ) {
$this->retrieve_widgets();
$widget_id = $request['id'];
$sidebar_id = wp_find_widgets_sidebar( $widget_id );
if ( $sidebar_id && $this->check_read_sidebar_permission( $sidebar_id ) ) {
return true;
}
return $this->permissions_check( $request );
}
/**
* Checks if a sidebar can be read publicly.
*
* @since 5.9.0
*
* @param string $sidebar_id The sidebar ID.
* @return bool Whether the sidebar can be read.
*/
protected function check_read_sidebar_permission( $sidebar_id ) {
$sidebar = wp_get_sidebar( $sidebar_id );
return ! empty( $sidebar['show_in_rest'] );
}
/**
* Gets an individual widget.
*
* @since 5.8.0
*
* @param WP_REST_Request $request Full details about the request.
* @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
*/
public function get_item( $request ) {
$this->retrieve_widgets();
$widget_id = $request['id'];
$sidebar_id = wp_find_widgets_sidebar( $widget_id );
if ( is_null( $sidebar_id ) ) {
return new WP_Error(
'rest_widget_not_found',
__( 'No widget was found with that id.' ),
array( 'status' => 404 )
);
}
return $this->prepare_item_for_response( compact( 'widget_id', 'sidebar_id' ), $request );
}
/**
* Checks if a given request has access to create widgets.
*
* @since 5.8.0
*
* @param WP_REST_Request $request Full details about the request.
* @return true|WP_Error True if the request has read access, WP_Error object otherwise.
*/
public function create_item_permissions_check( $request ) {
return $this->permissions_check( $request );
}
/**
* Creates a widget.
*
* @since 5.8.0
*
* @param WP_REST_Request $request Full details about the request.
* @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
*/
public function create_item( $request ) {
$sidebar_id = $request['sidebar'];
$widget_id = $this->save_widget( $request, $sidebar_id );
if ( is_wp_error( $widget_id ) ) {
return $widget_id;
}
wp_assign_widget_to_sidebar( $widget_id, $sidebar_id );
$request['context'] = 'edit';
$response = $this->prepare_item_for_response( compact( 'sidebar_id', 'widget_id' ), $request );
if ( is_wp_error( $response ) ) {
return $response;
}
$response->set_status( 201 );
return $response;
}
/**
* Checks if a given request has access to update widgets.
*
* @since 5.8.0
*
* @param WP_REST_Request $request Full details about the request.
* @return true|WP_Error True if the request has read access, WP_Error object otherwise.
*/
public function update_item_permissions_check( $request ) {
return $this->permissions_check( $request );
}
/**
* Updates an existing widget.
*
* @since 5.8.0
*
* @global WP_Widget_Factory $wp_widget_factory
*
* @param WP_REST_Request $request Full details about the request.
* @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
*/
public function update_item( $request ) {
global $wp_widget_factory;
/*
* retrieve_widgets() contains logic to move "hidden" or "lost" widgets to the
* wp_inactive_widgets sidebar based on the contents of the $sidebars_widgets global.
*
* When batch requests are processed, this global is not properly updated by previous
* calls, resulting in widgets incorrectly being moved to the wp_inactive_widgets
* sidebar.
*
* See https://core.trac.wordpress.org/ticket/53657.
*/
wp_get_sidebars_widgets();
$this->retrieve_widgets();
$widget_id = $request['id'];
$sidebar_id = wp_find_widgets_sidebar( $widget_id );
// Allow sidebar to be unset or missing when widget is not a WP_Widget.
$parsed_id = wp_parse_widget_id( $widget_id );
$widget_object = $wp_widget_factory->get_widget_object( $parsed_id['id_base'] );
if ( is_null( $sidebar_id ) && $widget_object ) {
return new WP_Error(
'rest_widget_not_found',
__( 'No widget was found with that id.' ),
array( 'status' => 404 )
);
}
if (
$request->has_param( 'instance' ) ||
$request->has_param( 'form_data' )
) {
$maybe_error = $this->save_widget( $request, $sidebar_id );
if ( is_wp_error( $maybe_error ) ) {
return $maybe_error;
}
}
if ( $request->has_param( 'sidebar' ) ) {
if ( $sidebar_id !== $request['sidebar'] ) {
$sidebar_id = $request['sidebar'];
wp_assign_widget_to_sidebar( $widget_id, $sidebar_id );
}
}
$request['context'] = 'edit';
return $this->prepare_item_for_response( compact( 'widget_id', 'sidebar_id' ), $request );
}
/**
* Checks if a given request has access to delete widgets.
*
* @since 5.8.0
*
* @param WP_REST_Request $request Full details about the request.
* @return true|WP_Error True if the request has read access, WP_Error object otherwise.
*/
public function delete_item_permissions_check( $request ) {
return $this->permissions_check( $request );
}
/**
* Deletes a widget.
*
* @since 5.8.0
*
* @global WP_Widget_Factory $wp_widget_factory
* @global array $wp_registered_widget_updates The registered widget update functions.
*
* @param WP_REST_Request $request Full details about the request.
* @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
*/
public function delete_item( $request ) {
global $wp_widget_factory, $wp_registered_widget_updates;
/*
* retrieve_widgets() contains logic to move "hidden" or "lost" widgets to the
* wp_inactive_widgets sidebar based on the contents of the $sidebars_widgets global.
*
* When batch requests are processed, this global is not properly updated by previous
* calls, resulting in widgets incorrectly being moved to the wp_inactive_widgets
* sidebar.
*
* See https://core.trac.wordpress.org/ticket/53657.
*/
wp_get_sidebars_widgets();
$this->retrieve_widgets();
$widget_id = $request['id'];
$sidebar_id = wp_find_widgets_sidebar( $widget_id );
if ( is_null( $sidebar_id ) ) {
return new WP_Error(
'rest_widget_not_found',
__( 'No widget was found with that id.' ),
array( 'status' => 404 )
);
}
$request['context'] = 'edit';
if ( $request['force'] ) {
$response = $this->prepare_item_for_response( compact( 'widget_id', 'sidebar_id' ), $request );
$parsed_id = wp_parse_widget_id( $widget_id );
$id_base = $parsed_id['id_base'];
$original_post = $_POST;
$original_request = $_REQUEST;
$_POST = array(
'sidebar' => $sidebar_id,
"widget-$id_base" => array(),
'the-widget-id' => $widget_id,
'delete_widget' => '1',
);
$_REQUEST = $_POST;
/** This action is documented in wp-admin/widgets-form.php */
do_action( 'delete_widget', $widget_id, $sidebar_id, $id_base );
$callback = $wp_registered_widget_updates[ $id_base ]['callback'];
$params = $wp_registered_widget_updates[ $id_base ]['params'];
if ( is_callable( $callback ) ) {
ob_start();
call_user_func_array( $callback, $params );
ob_end_clean();
}
$_POST = $original_post;
$_REQUEST = $original_request;
$widget_object = $wp_widget_factory->get_widget_object( $id_base );
if ( $widget_object ) {
/*
* WP_Widget sets `updated = true` after an update to prevent more than one widget
* from being saved per request. This isn't what we want in the REST API, though,
* as we support batch requests.
*/
$widget_object->updated = false;
}
wp_assign_widget_to_sidebar( $widget_id, '' );
$response->set_data(
array(
'deleted' => true,
'previous' => $response->get_data(),
)
);
} else {
wp_assign_widget_to_sidebar( $widget_id, 'wp_inactive_widgets' );
$response = $this->prepare_item_for_response(
array(
'sidebar_id' => 'wp_inactive_widgets',
'widget_id' => $widget_id,
),
$request
);
}
/**
* Fires after a widget is deleted via the REST API.
*
* @since 5.8.0
*
* @param string $widget_id ID of the widget marked for deletion.
* @param string $sidebar_id ID of the sidebar the widget was deleted from.
* @param WP_REST_Response|WP_Error $response The response data, or WP_Error object on failure.
* @param WP_REST_Request $request The request sent to the API.
*/
do_action( 'rest_delete_widget', $widget_id, $sidebar_id, $response, $request );
return $response;
}
/**
* Performs a permissions check for managing widgets.
*
* @since 5.8.0
*
* @param WP_REST_Request $request Full details about the request.
* @return true|WP_Error
*/
protected function permissions_check( $request ) {
if ( ! current_user_can( 'edit_theme_options' ) ) {
return new WP_Error(
'rest_cannot_manage_widgets',
__( 'Sorry, you are not allowed to manage widgets on this site.' ),
array(
'status' => rest_authorization_required_code(),
)
);
}
return true;
}
/**
* Looks for "lost" widgets once per request.
*
* @since 5.9.0
*
* @see retrieve_widgets()
*/
protected function retrieve_widgets() {
if ( ! $this->widgets_retrieved ) {
retrieve_widgets();
$this->widgets_retrieved = true;
}
}
/**
* Saves the widget in the request object.
*
* @since 5.8.0
*
* @global WP_Widget_Factory $wp_widget_factory
* @global array $wp_registered_widget_updates The registered widget update functions.
*
* @param WP_REST_Request $request Full details about the request.
* @param string $sidebar_id ID of the sidebar the widget belongs to.
* @return string|WP_Error The saved widget ID.
*/
protected function save_widget( $request, $sidebar_id ) {
global $wp_widget_factory, $wp_registered_widget_updates;
require_once ABSPATH . 'wp-admin/includes/widgets.php'; // For next_widget_id_number().
if ( isset( $request['id'] ) ) {
// Saving an existing widget.
$id = $request['id'];
$parsed_id = wp_parse_widget_id( $id );
$id_base = $parsed_id['id_base'];
$number = isset( $parsed_id['number'] ) ? $parsed_id['number'] : null;
$widget_object = $wp_widget_factory->get_widget_object( $id_base );
$creating = false;
} elseif ( $request['id_base'] ) {
// Saving a new widget.
$id_base = $request['id_base'];
$widget_object = $wp_widget_factory->get_widget_object( $id_base );
$number = $widget_object ? next_widget_id_number( $id_base ) : null;
$id = $widget_object ? $id_base . '-' . $number : $id_base;
$creating = true;
} else {
return new WP_Error(
'rest_invalid_widget',
__( 'Widget type (id_base) is required.' ),
array( 'status' => 400 )
);
}
if ( ! isset( $wp_registered_widget_updates[ $id_base ] ) ) {
return new WP_Error(
'rest_invalid_widget',
__( 'The provided widget type (id_base) cannot be updated.' ),
array( 'status' => 400 )
);
}
if ( isset( $request['instance'] ) ) {
if ( ! $widget_object ) {
return new WP_Error(
'rest_invalid_widget',
__( 'Cannot set instance on a widget that does not extend WP_Widget.' ),
array( 'status' => 400 )
);
}
if ( isset( $request['instance']['raw'] ) ) {
if ( empty( $widget_object->widget_options['show_instance_in_rest'] ) ) {
return new WP_Error(
'rest_invalid_widget',
__( 'Widget type does not support raw instances.' ),
array( 'status' => 400 )
);
}
$instance = $request['instance']['raw'];
} elseif ( isset( $request['instance']['encoded'], $request['instance']['hash'] ) ) {
$serialized_instance = base64_decode( $request['instance']['encoded'] );
if ( ! hash_equals( wp_hash( $serialized_instance ), $request['instance']['hash'] ) ) {
return new WP_Error(
'rest_invalid_widget',
__( 'The provided instance is malformed.' ),
array( 'status' => 400 )
);
}
$instance = unserialize( $serialized_instance );
} else {
return new WP_Error(
'rest_invalid_widget',
__( 'The provided instance is invalid. Must contain raw OR encoded and hash.' ),
array( 'status' => 400 )
);
}
$form_data = array(
"widget-$id_base" => array(
$number => $instance,
),
'sidebar' => $sidebar_id,
);
} elseif ( isset( $request['form_data'] ) ) {
$form_data = $request['form_data'];
} else {
$form_data = array();
}
$original_post = $_POST;
$original_request = $_REQUEST;
foreach ( $form_data as $key => $value ) {
$slashed_value = wp_slash( $value );
$_POST[ $key ] = $slashed_value;
$_REQUEST[ $key ] = $slashed_value;
}
$callback = $wp_registered_widget_updates[ $id_base ]['callback'];
$params = $wp_registered_widget_updates[ $id_base ]['params'];
if ( is_callable( $callback ) ) {
ob_start();
call_user_func_array( $callback, $params );
ob_end_clean();
}
$_POST = $original_post;
$_REQUEST = $original_request;
if ( $widget_object ) {
// Register any multi-widget that the update callback just created.
$widget_object->_set( $number );
$widget_object->_register_one( $number );
/*
* WP_Widget sets `updated = true` after an update to prevent more than one widget
* from being saved per request. This isn't what we want in the REST API, though,
* as we support batch requests.
*/
$widget_object->updated = false;
}
/**
* Fires after a widget is created or updated via the REST API.
*
* @since 5.8.0
*
* @param string $id ID of the widget being saved.
* @param string $sidebar_id ID of the sidebar containing the widget being saved.
* @param WP_REST_Request $request Request object.
* @param bool $creating True when creating a widget, false when updating.
*/
do_action( 'rest_after_save_widget', $id, $sidebar_id, $request, $creating );
return $id;
}
/**
* Prepares the widget for the REST response.
*
* @since 5.8.0
*
* @global WP_Widget_Factory $wp_widget_factory
* @global array $wp_registered_widgets The registered widgets.
*
* @param array $item An array containing a widget_id and sidebar_id.
* @param WP_REST_Request $request Request object.
* @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
*/
public function prepare_item_for_response( $item, $request ) {
global $wp_widget_factory, $wp_registered_widgets;
$widget_id = $item['widget_id'];
$sidebar_id = $item['sidebar_id'];
if ( ! isset( $wp_registered_widgets[ $widget_id ] ) ) {
return new WP_Error(
'rest_invalid_widget',
__( 'The requested widget is invalid.' ),
array( 'status' => 500 )
);
}
$widget = $wp_registered_widgets[ $widget_id ];
$parsed_id = wp_parse_widget_id( $widget_id );
$fields = $this->get_fields_for_response( $request );
$prepared = array(
'id' => $widget_id,
'id_base' => $parsed_id['id_base'],
'sidebar' => $sidebar_id,
'rendered' => '',
'rendered_form' => null,
'instance' => null,
);
if (
rest_is_field_included( 'rendered', $fields ) &&
'wp_inactive_widgets' !== $sidebar_id
) {
$prepared['rendered'] = trim( wp_render_widget( $widget_id, $sidebar_id ) );
}
if ( rest_is_field_included( 'rendered_form', $fields ) ) {
$rendered_form = wp_render_widget_control( $widget_id );
if ( ! is_null( $rendered_form ) ) {
$prepared['rendered_form'] = trim( $rendered_form );
}
}
if ( rest_is_field_included( 'instance', $fields ) ) {
$widget_object = $wp_widget_factory->get_widget_object( $parsed_id['id_base'] );
if ( $widget_object && isset( $parsed_id['number'] ) ) {
$all_instances = $widget_object->get_settings();
$instance = $all_instances[ $parsed_id['number'] ];
$serialized_instance = serialize( $instance );
$prepared['instance']['encoded'] = base64_encode( $serialized_instance );
$prepared['instance']['hash'] = wp_hash( $serialized_instance );
if ( ! empty( $widget_object->widget_options['show_instance_in_rest'] ) ) {
// Use new stdClass so that JSON result is {} and not [].
$prepared['instance']['raw'] = empty( $instance ) ? new stdClass : $instance;
}
}
}
$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
$prepared = $this->add_additional_fields_to_object( $prepared, $request );
$prepared = $this->filter_response_by_context( $prepared, $context );
$response = rest_ensure_response( $prepared );
$response->add_links( $this->prepare_links( $prepared ) );
/**
* Filters the REST API response for a widget.
*
* @since 5.8.0
*
* @param WP_REST_Response|WP_Error $response The response object, or WP_Error object on failure.
* @param array $widget The registered widget data.
* @param WP_REST_Request $request Request used to generate the response.
*/
return apply_filters( 'rest_prepare_widget', $response, $widget, $request );
}
/**
* Prepares links for the widget.
*
* @since 5.8.0
*
* @param array $prepared Widget.
* @return array Links for the given widget.
*/
protected function prepare_links( $prepared ) {
$id_base = ! empty( $prepared['id_base'] ) ? $prepared['id_base'] : $prepared['id'];
return array(
'self' => array(
'href' => rest_url( sprintf( '%s/%s/%s', $this->namespace, $this->rest_base, $prepared['id'] ) ),
),
'collection' => array(
'href' => rest_url( sprintf( '%s/%s', $this->namespace, $this->rest_base ) ),
),
'about' => array(
'href' => rest_url( sprintf( 'wp/v2/widget-types/%s', $id_base ) ),
'embeddable' => true,
),
'https://api.w.org/sidebar' => array(
'href' => rest_url( sprintf( 'wp/v2/sidebars/%s/', $prepared['sidebar'] ) ),
),
);
}
/**
* Gets the list of collection params.
*
* @since 5.8.0
*
* @return array[]
*/
public function get_collection_params() {
return array(
'context' => $this->get_context_param( array( 'default' => 'view' ) ),
'sidebar' => array(
'description' => __( 'The sidebar to return widgets for.' ),
'type' => 'string',
),
);
}
/**
* Retrieves the widget's schema, conforming to JSON Schema.
*
* @since 5.8.0
*
* @return array Item schema data.
*/
public function get_item_schema() {
if ( $this->schema ) {
return $this->add_additional_fields_schema( $this->schema );
}
$this->schema = array(
'$schema' => 'http://json-schema.org/draft-04/schema#',
'title' => 'widget',
'type' => 'object',
'properties' => array(
'id' => array(
'description' => __( 'Unique identifier for the widget.' ),
'type' => 'string',
'context' => array( 'view', 'edit', 'embed' ),
),
'id_base' => array(
'description' => __( 'The type of the widget. Corresponds to ID in widget-types endpoint.' ),
'type' => 'string',
'context' => array( 'view', 'edit', 'embed' ),
),
'sidebar' => array(
'description' => __( 'The sidebar the widget belongs to.' ),
'type' => 'string',
'default' => 'wp_inactive_widgets',
'required' => true,
'context' => array( 'view', 'edit', 'embed' ),
),
'rendered' => array(
'description' => __( 'HTML representation of the widget.' ),
'type' => 'string',
'context' => array( 'view', 'edit', 'embed' ),
'readonly' => true,
),
'rendered_form' => array(
'description' => __( 'HTML representation of the widget admin form.' ),
'type' => 'string',
'context' => array( 'edit' ),
'readonly' => true,
),
'instance' => array(
'description' => __( 'Instance settings of the widget, if supported.' ),
'type' => 'object',
'context' => array( 'edit' ),
'default' => null,
'properties' => array(
'encoded' => array(
'description' => __( 'Base64 encoded representation of the instance settings.' ),
'type' => 'string',
'context' => array( 'edit' ),
),
'hash' => array(
'description' => __( 'Cryptographic hash of the instance settings.' ),
'type' => 'string',
'context' => array( 'edit' ),
),
'raw' => array(
'description' => __( 'Unencoded instance settings, if supported.' ),
'type' => 'object',
'context' => array( 'edit' ),
),
),
),
'form_data' => array(
'description' => __( 'URL-encoded form data from the widget admin form. Used to update a widget that does not support instance. Write only.' ),
'type' => 'string',
'context' => array(),
'arg_options' => array(
'sanitize_callback' => static function( $string ) {
$array = array();
wp_parse_str( $string, $array );
return $array;
},
),
),
),
);
return $this->add_additional_fields_schema( $this->schema );
}
}