namespace Automattic\WooCommerce\StoreApi\Schemas;
use Automattic\WooCommerce\StoreApi\Schemas\V1\CartItemSchema;
use Automattic\WooCommerce\StoreApi\Schemas\V1\CartSchema;
use Automattic\WooCommerce\StoreApi\Schemas\V1\CheckoutSchema;
use Automattic\WooCommerce\StoreApi\Schemas\V1\ProductSchema;
use Automattic\WooCommerce\StoreApi\Formatters;
* Provides utility functions to extend Store API schemas.
* Note there are also helpers that map to these methods.
* @see woocommerce_store_api_register_endpoint_data()
* @see woocommerce_store_api_register_update_callback()
* @see woocommerce_store_api_register_payment_requirements()
* @see woocommerce_store_api_get_formatter()
final class ExtendSchema {
* List of Store API schema that is allowed to be extended by extensions.
CartItemSchema::IDENTIFIER,
CheckoutSchema::IDENTIFIER,
ProductSchema::IDENTIFIER,
* Holds the formatters class instance.
private $extend_data = [];
private $callback_methods = [];
* Array of payment requirements
private $payment_requirements = [];
* @param Formatters $formatters An instance of the formatters class.
public function __construct( Formatters $formatters ) {
$this->formatters = $formatters;
* Register endpoint data under a specified namespace
* An array of elements that make up a post to update or insert.
* @type string $endpoint Required. The endpoint to extend.
* @type string $namespace Required. Plugin namespace.
* @type callable $schema_callback Callback executed to add schema data.
* @type callable $data_callback Callback executed to add endpoint data.
* @type string $schema_type The type of data, object or array.
* @throws \Exception On failure to register.
public function register_endpoint_data( $args ) {
'schema_callback' => null,
'schema_type' => ARRAY_A,
if ( ! is_string( $args['namespace'] ) || empty( $args['namespace'] ) ) {
$this->throw_exception( 'You must provide a plugin namespace when extending a Store REST endpoint.' );
if ( ! in_array( $args['endpoint'], $this->endpoints, true ) ) {
sprintf( 'You must provide a valid Store REST endpoint to extend, valid endpoints are: %1$s. You provided %2$s.', implode( ', ', $this->endpoints ), $args['endpoint'] )
if ( ! is_null( $args['schema_callback'] ) && ! is_callable( $args['schema_callback'] ) ) {
$this->throw_exception( '$schema_callback must be a callable function.' );
if ( ! is_null( $args['data_callback'] ) && ! is_callable( $args['data_callback'] ) ) {
$this->throw_exception( '$data_callback must be a callable function.' );
if ( ! in_array( $args['schema_type'], [ ARRAY_N, ARRAY_A ], true ) ) {
sprintf( 'Data type must be either ARRAY_N for a numeric array or ARRAY_A for an object like array. You provided %1$s.', $args['schema_type'] )
$this->extend_data[ $args['endpoint'] ][ $args['namespace'] ] = [
'schema_callback' => $args['schema_callback'],
'data_callback' => $args['data_callback'],
'schema_type' => $args['schema_type'],
* Add callback functions that can be executed by the cart/extensions endpoint.
* An array of elements that make up the callback configuration.
* @type string $namespace Required. Plugin namespace.
* @type callable $callback Required. The function/callable to execute.
* @throws \Exception On failure to register.
public function register_update_callback( $args ) {
if ( ! is_string( $args['namespace'] ) || empty( $args['namespace'] ) ) {
throw new \Exception( 'You must provide a plugin namespace when extending a Store REST endpoint.' );
if ( ! is_callable( $args['callback'] ) ) {
throw new \Exception( 'There is no valid callback supplied to register_update_callback.' );
$this->callback_methods[ $args['namespace'] ] = $args;
* Registers and validates payment requirements callbacks.
* Array of registration data.
* @type callable $data_callback Required. Callback executed to add payment requirements data.
* @throws \Exception On failure to register.
public function register_payment_requirements( $args ) {
if ( empty( $args['data_callback'] ) || ! is_callable( $args['data_callback'] ) ) {
$this->throw_exception( '$data_callback must be a callable function.' );
$this->payment_requirements[] = $args['data_callback'];
* Returns a formatter instance.
* @param string $name Formatter name.
* @return FormatterInterface
public function get_formatter( $name ) {
return $this->formatters->$name;
* Get callback for a specific endpoint and namespace.
* @param string $namespace The namespace to get callbacks for.
* @return callable The callback registered by the extension.
* @throws \Exception When callback is not callable or parameters are incorrect.
public function get_update_callback( $namespace ) {
if ( ! is_string( $namespace ) ) {
throw new \Exception( 'You must provide a plugin namespace when extending a Store REST endpoint.' );
if ( ! array_key_exists( $namespace, $this->callback_methods ) ) {
throw new \Exception( sprintf( 'There is no such namespace registered: %1$s.', $namespace ) );
if ( ! array_key_exists( 'callback', $this->callback_methods[ $namespace ] ) || ! is_callable( $this->callback_methods[ $namespace ]['callback'] ) ) {
throw new \Exception( sprintf( 'There is no valid callback registered for: %1$s.', $namespace ) );
return $this->callback_methods[ $namespace ]['callback'];
* Returns the registered endpoint data
* @param string $endpoint A valid identifier.
* @param array $passed_args Passed arguments from the Schema class.
* @return object Returns an casted object with registered endpoint data.
* @throws \Exception If a registered callback throws an error, or silently logs it.
public function get_endpoint_data( $endpoint, array $passed_args = [] ) {
if ( isset( $this->extend_data[ $endpoint ] ) ) {
foreach ( $this->extend_data[ $endpoint ] as $namespace => $callbacks ) {
if ( is_null( $callbacks['data_callback'] ) ) {
$data = $callbacks['data_callback']( ...$passed_args );
if ( ! is_array( $data ) ) {
throw new \Exception( '$data_callback must return an array.' );
} catch ( \Throwable $e ) {
$this->throw_exception( $e );
$registered_data[ $namespace ] = $data;
return (object) $registered_data;
* Returns the registered endpoint schema
* @param string $endpoint A valid identifier.
* @param array $passed_args Passed arguments from the Schema class.
* @return object Returns an array with registered schema data.
* @throws \Exception If a registered callback throws an error, or silently logs it.
public function get_endpoint_schema( $endpoint, array $passed_args = [] ) {
if ( isset( $this->extend_data[ $endpoint ] ) ) {
foreach ( $this->extend_data[ $endpoint ] as $namespace => $callbacks ) {
if ( is_null( $callbacks['schema_callback'] ) ) {
$schema = $callbacks['schema_callback']( ...$passed_args );
if ( ! is_array( $schema ) ) {
throw new \Exception( '$schema_callback must return an array.' );
} catch ( \Throwable $e ) {
$this->throw_exception( $e );
$registered_schema[ $namespace ] = $this->format_extensions_properties( $namespace, $schema, $callbacks['schema_type'] );
return (object) $registered_schema;
* Returns the additional payment requirements for the cart which are required to make payments. Values listed here
* are compared against each Payment Gateways "supports" flag.
* @param array $requirements list of requirements that should be added to the collected requirements.
* @return array Returns a list of payment requirements.
* @throws \Exception If a registered callback throws an error, or silently logs it.
public function get_payment_requirements( array $requirements = [ 'products' ] ) {
if ( ! empty( $this->payment_requirements ) ) {
foreach ( $this->payment_requirements as $callback ) {
if ( ! is_array( $data ) ) {
throw new \Exception( '$data_callback must return an array.' );
$requirements = array_unique( array_merge( $requirements, $data ) );
} catch ( \Throwable $e ) {
$this->throw_exception( $e );
* Throws error and/or silently logs it.
* @param string|\Throwable $exception_or_error Error message or \Exception.
* @throws \Exception An error to throw if we have debug enabled and user is admin.
private function throw_exception( $exception_or_error ) {
$exception = is_string( $exception_or_error ) ? new \Exception( $exception_or_error ) : $exception_or_error;
wc_caught_exception( $exception );
if ( defined( 'WP_DEBUG' ) && WP_DEBUG && current_user_can( 'manage_woocommerce' ) ) {
* Format schema for an extension.
* @param string $namespace Error message or \Exception.
* @param array $schema An error to throw if we have debug enabled and user is admin.
* @param string $schema_type How should data be shaped.
* @return array Formatted schema.
private function format_extensions_properties( $namespace, $schema, $schema_type ) {
if ( ARRAY_N === $schema_type ) {
/* translators: %s: extension namespace */
'description' => sprintf( __( 'Extension data registered by %s', 'woocommerce' ), $namespace ),
'type' => [ 'array', 'null' ],
'context' => [ 'view', 'edit' ],
/* translators: %s: extension namespace */
'description' => sprintf( __( 'Extension data registered by %s', 'woocommerce' ), $namespace ),
'type' => [ 'object', 'null' ],
'context' => [ 'view', 'edit' ],
It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
