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