WP_REST_Widget_Types_Controller::encode_form_data( WP_REST_Request $request )

An RPC-style endpoint which can be used by clients to turn user input in a widget admin form into an encoded instance object.


Description Description

Accepts:

  • id: A widget type ID.
  • instance: A widget’s encoded instance object. Optional.
  • form_data: Form data from submitting a widget’s admin form. Optional.

Returns:

  • instance: The encoded instance object after updating the widget with the given form data.
  • form: The widget’s admin form after updating the widget with the given form data.

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Parameters Parameters

$request

(WP_REST_Request) (Required) Full details about the request.


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Return Return

(WP_REST_Response|WP_Error) Response object on success, or WP_Error object on failure.


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Source Source

File: wp-includes/rest-api/endpoints/class-wp-rest-widget-types-controller.php

	public function encode_form_data( $request ) {
		global $wp_widget_factory;

		$id            = $request['id'];
		$widget_object = $wp_widget_factory->get_widget_object( $id );

		if ( ! $widget_object ) {
			return new WP_Error(
				'rest_invalid_widget',
				__( 'Cannot preview a widget that does not extend WP_Widget.' ),
				array( 'status' => 400 )
			);
		}

		// Set the widget's number so that the id attributes in the HTML that we
		// return are predictable.
		if ( isset( $request['number'] ) && is_numeric( $request['number'] ) ) {
			$widget_object->_set( (int) $request['number'] );
		} else {
			$widget_object->_set( -1 );
		}

		if ( 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 {
			$instance = array();
		}

		if (
			isset( $request['form_data'][ "widget-$id" ] ) &&
			is_array( $request['form_data'][ "widget-$id" ] )
		) {
			$new_instance = array_values( $request['form_data'][ "widget-$id" ] )[0];
			$old_instance = $instance;

			$instance = $widget_object->update( $new_instance, $old_instance );

			/** This filter is documented in wp-includes/class-wp-widget.php */
			$instance = apply_filters(
				'widget_update_callback',
				$instance,
				$new_instance,
				$old_instance,
				$widget_object
			);
		}

		$serialized_instance = serialize( $instance );
		$widget_key          = $wp_widget_factory->get_widget_key( $id );

		$response = array(
			'form'     => trim(
				$this->get_widget_form(
					$widget_object,
					$instance
				)
			),
			'preview'  => trim(
				$this->get_widget_preview(
					$widget_key,
					$instance
				)
			),
			'instance' => array(
				'encoded' => base64_encode( $serialized_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 [].
			$response['instance']['raw'] = empty( $instance ) ? new stdClass : $instance;
		}

		return rest_ensure_response( $response );
	}


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Changelog
Version Description
5.8.0 Introduced.

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