334 lines
9.9 KiB
PHP
334 lines
9.9 KiB
PHP
<?php
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/**
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* REST API: WP_REST_Settings_Controller class
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*
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* @package WordPress
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* @subpackage REST_API
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* @since 4.7.0
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*/
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/**
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* Core class used to manage a site's settings via the REST API.
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*
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* @since 4.7.0
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*
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* @see WP_REST_Controller
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*/
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class WP_REST_Settings_Controller extends WP_REST_Controller {
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/**
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* Constructor.
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*
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* @since 4.7.0
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*/
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public function __construct() {
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$this->namespace = 'wp/v2';
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$this->rest_base = 'settings';
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}
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/**
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* Registers the routes for the objects of the controller.
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*
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* @since 4.7.0
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*
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* @see register_rest_route()
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*/
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public function register_routes() {
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register_rest_route( $this->namespace, '/' . $this->rest_base, array(
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array(
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'methods' => WP_REST_Server::READABLE,
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'callback' => array( $this, 'get_item' ),
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'args' => array(),
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'permission_callback' => array( $this, 'get_item_permissions_check' ),
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),
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array(
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'methods' => WP_REST_Server::EDITABLE,
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'callback' => array( $this, 'update_item' ),
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'args' => $this->get_endpoint_args_for_item_schema( WP_REST_Server::EDITABLE ),
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'permission_callback' => array( $this, 'get_item_permissions_check' ),
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),
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'schema' => array( $this, 'get_public_item_schema' ),
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) );
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}
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/**
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* Checks if a given request has access to read and manage settings.
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*
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* @since 4.7.0
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*
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* @param WP_REST_Request $request Full details about the request.
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* @return bool True if the request has read access for the item, otherwise false.
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*/
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public function get_item_permissions_check( $request ) {
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return current_user_can( 'manage_options' );
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}
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/**
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* Retrieves the settings.
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*
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* @since 4.7.0
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*
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* @param WP_REST_Request $request Full details about the request.
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* @return array|WP_Error Array on success, or WP_Error object on failure.
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*/
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public function get_item( $request ) {
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$options = $this->get_registered_options();
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$response = array();
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foreach ( $options as $name => $args ) {
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/**
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* Filters the value of a setting recognized by the REST API.
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*
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* Allow hijacking the setting value and overriding the built-in behavior by returning a
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* non-null value. The returned value will be presented as the setting value instead.
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*
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* @since 4.7.0
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*
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* @param mixed $result Value to use for the requested setting. Can be a scalar
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* matching the registered schema for the setting, or null to
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* follow the default get_option() behavior.
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* @param string $name Setting name (as shown in REST API responses).
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* @param array $args Arguments passed to register_setting() for this setting.
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*/
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$response[ $name ] = apply_filters( 'rest_pre_get_setting', null, $name, $args );
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if ( is_null( $response[ $name ] ) ) {
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// Default to a null value as "null" in the response means "not set".
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$response[ $name ] = get_option( $args['option_name'], $args['schema']['default'] );
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}
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/*
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* Because get_option() is lossy, we have to
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* cast values to the type they are registered with.
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*/
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$response[ $name ] = $this->prepare_value( $response[ $name ], $args['schema'] );
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}
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return $response;
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}
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/**
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* Prepares a value for output based off a schema array.
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*
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* @since 4.7.0
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*
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* @param mixed $value Value to prepare.
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* @param array $schema Schema to match.
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* @return mixed The prepared value.
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*/
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protected function prepare_value( $value, $schema ) {
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// If the value is not valid by the schema, set the value to null. Null
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// values are specifcally non-destructive so this will not cause overwriting
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// the current invalid value to null.
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if ( is_wp_error( rest_validate_value_from_schema( $value, $schema ) ) ) {
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return null;
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}
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return rest_sanitize_value_from_schema( $value, $schema );
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}
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/**
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* Updates settings for the settings object.
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*
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* @since 4.7.0
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*
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* @param WP_REST_Request $request Full details about the request.
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* @return array|WP_Error Array on success, or error object on failure.
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*/
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public function update_item( $request ) {
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$options = $this->get_registered_options();
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$params = $request->get_params();
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foreach ( $options as $name => $args ) {
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if ( ! array_key_exists( $name, $params ) ) {
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continue;
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}
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/**
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* Filters whether to preempt a setting value update.
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*
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* Allows hijacking the setting update logic and overriding the built-in behavior by
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* returning true.
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*
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* @since 4.7.0
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*
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* @param bool $result Whether to override the default behavior for updating the
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* value of a setting.
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* @param string $name Setting name (as shown in REST API responses).
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* @param mixed $value Updated setting value.
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* @param array $args Arguments passed to register_setting() for this setting.
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*/
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$updated = apply_filters( 'rest_pre_update_setting', false, $name, $request[ $name ], $args );
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if ( $updated ) {
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continue;
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}
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/*
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* A null value for an option would have the same effect as
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* deleting the option from the database, and relying on the
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* default value.
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*/
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if ( is_null( $request[ $name ] ) ) {
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/*
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* A null value is returned in the response for any option
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* that has a non-scalar value.
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*
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* To protect clients from accidentally including the null
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* values from a response object in a request, we do not allow
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* options with values that don't pass validation to be updated to null.
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* Without this added protection a client could mistakenly
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* delete all options that have invalid values from the
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* database.
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*/
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if ( is_wp_error( rest_validate_value_from_schema( get_option( $args['option_name'], false ), $args['schema'] ) ) ) {
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return new WP_Error(
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'rest_invalid_stored_value', sprintf( __( 'The %s property has an invalid stored value, and cannot be updated to null.' ), $name ), array( 'status' => 500 )
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);
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}
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delete_option( $args['option_name'] );
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} else {
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update_option( $args['option_name'], $request[ $name ] );
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}
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}
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return $this->get_item( $request );
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}
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/**
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* Retrieves all of the registered options for the Settings API.
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*
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* @since 4.7.0
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*
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* @return array Array of registered options.
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*/
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protected function get_registered_options() {
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$rest_options = array();
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foreach ( get_registered_settings() as $name => $args ) {
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if ( empty( $args['show_in_rest'] ) ) {
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continue;
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}
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$rest_args = array();
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if ( is_array( $args['show_in_rest'] ) ) {
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$rest_args = $args['show_in_rest'];
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}
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$defaults = array(
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'name' => ! empty( $rest_args['name'] ) ? $rest_args['name'] : $name,
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'schema' => array(),
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);
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$rest_args = array_merge( $defaults, $rest_args );
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$default_schema = array(
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'type' => empty( $args['type'] ) ? null : $args['type'],
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'description' => empty( $args['description'] ) ? '' : $args['description'],
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'default' => isset( $args['default'] ) ? $args['default'] : null,
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);
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$rest_args['schema'] = array_merge( $default_schema, $rest_args['schema'] );
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$rest_args['option_name'] = $name;
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// Skip over settings that don't have a defined type in the schema.
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if ( empty( $rest_args['schema']['type'] ) ) {
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continue;
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}
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/*
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* Whitelist the supported types for settings, as we don't want invalid types
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* to be updated with arbitrary values that we can't do decent sanitizing for.
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*/
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if ( ! in_array( $rest_args['schema']['type'], array( 'number', 'integer', 'string', 'boolean', 'array', 'object' ), true ) ) {
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continue;
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}
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$rest_args['schema'] = $this->set_additional_properties_to_false( $rest_args['schema'] );
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$rest_options[ $rest_args['name'] ] = $rest_args;
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}
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return $rest_options;
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}
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/**
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* Retrieves the site setting schema, conforming to JSON Schema.
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*
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* @since 4.7.0
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*
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* @return array Item schema data.
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*/
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public function get_item_schema() {
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$options = $this->get_registered_options();
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$schema = array(
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'$schema' => 'http://json-schema.org/draft-04/schema#',
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'title' => 'settings',
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'type' => 'object',
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'properties' => array(),
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);
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foreach ( $options as $option_name => $option ) {
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$schema['properties'][ $option_name ] = $option['schema'];
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$schema['properties'][ $option_name ]['arg_options'] = array(
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'sanitize_callback' => array( $this, 'sanitize_callback' ),
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);
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}
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return $this->add_additional_fields_schema( $schema );
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}
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/**
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* Custom sanitize callback used for all options to allow the use of 'null'.
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*
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* By default, the schema of settings will throw an error if a value is set to
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* `null` as it's not a valid value for something like "type => string". We
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* provide a wrapper sanitizer to whitelist the use of `null`.
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*
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* @since 4.7.0
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*
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* @param mixed $value The value for the setting.
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* @param WP_REST_Request $request The request object.
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* @param string $param The parameter name.
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* @return mixed|WP_Error
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*/
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public function sanitize_callback( $value, $request, $param ) {
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if ( is_null( $value ) ) {
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return $value;
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}
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return rest_parse_request_arg( $value, $request, $param );
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}
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/**
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* Recursively add additionalProperties = false to all objects in a schema.
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*
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* This is need to restrict properties of objects in settings values to only
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* registered items, as the REST API will allow additional properties by
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* default.
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*
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* @since 4.9.0
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*
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* @param array $schema The schema array.
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* @return array
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*/
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protected function set_additional_properties_to_false( $schema ) {
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switch ( $schema['type'] ) {
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case 'object':
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foreach ( $schema['properties'] as $key => $child_schema ) {
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$schema['properties'][ $key ] = $this->set_additional_properties_to_false( $child_schema );
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}
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$schema['additionalProperties'] = false;
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break;
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case 'array':
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$schema['items'] = $this->set_additional_properties_to_false( $schema['items'] );
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break;
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}
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return $schema;
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}
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}
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