--- /dev/null
+<?php
+/**
+ * REST API: WP_REST_Controller class
+ *
+ * @package WordPress
+ * @subpackage REST_API
+ * @since 4.7.0
+ */
+
+/**
+ * Core base controller for managing and interacting with REST API items.
+ *
+ * @since 4.7.0
+ */
+abstract class WP_REST_Controller {
+
+ /**
+ * The namespace of this controller's route.
+ *
+ * @since 4.7.0
+ * @access protected
+ * @var string
+ */
+ protected $namespace;
+
+ /**
+ * The base of this controller's route.
+ *
+ * @since 4.7.0
+ * @access protected
+ * @var string
+ */
+ protected $rest_base;
+
+ /**
+ * Registers the routes for the objects of the controller.
+ *
+ * @since 4.7.0
+ * @access public
+ */
+ public function register_routes() {
+ _doing_it_wrong( 'WP_REST_Controller::register_routes', __( 'The register_routes() method must be overridden' ), '4.7' );
+ }
+
+ /**
+ * Checks if a given request has access to get items.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param WP_REST_Request $request Full data about the request.
+ * @return WP_Error|bool True if the request has read access, WP_Error object otherwise.
+ */
+ public function get_items_permissions_check( $request ) {
+ return new WP_Error( 'invalid-method', sprintf( __( "Method '%s' not implemented. Must be overridden in subclass." ), __METHOD__ ), array( 'status' => 405 ) );
+ }
+
+ /**
+ * Retrieves a collection of items.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param WP_REST_Request $request Full data about the request.
+ * @return WP_Error|WP_REST_Response Response object on success, or WP_Error object on failure.
+ */
+ public function get_items( $request ) {
+ return new WP_Error( 'invalid-method', sprintf( __( "Method '%s' not implemented. Must be overridden in subclass." ), __METHOD__ ), array( 'status' => 405 ) );
+ }
+
+ /**
+ * Checks if a given request has access to get a specific item.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param WP_REST_Request $request Full data about the request.
+ * @return WP_Error|bool True if the request has read access for the item, WP_Error object otherwise.
+ */
+ public function get_item_permissions_check( $request ) {
+ return new WP_Error( 'invalid-method', sprintf( __( "Method '%s' not implemented. Must be overridden in subclass." ), __METHOD__ ), array( 'status' => 405 ) );
+ }
+
+ /**
+ * Retrieves one item from the collection.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param WP_REST_Request $request Full data about the request.
+ * @return WP_Error|WP_REST_Response Response object on success, or WP_Error object on failure.
+ */
+ public function get_item( $request ) {
+ return new WP_Error( 'invalid-method', sprintf( __( "Method '%s' not implemented. Must be overridden in subclass." ), __METHOD__ ), array( 'status' => 405 ) );
+ }
+
+ /**
+ * Checks if a given request has access to create items.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param WP_REST_Request $request Full data about the request.
+ * @return WP_Error|bool True if the request has access to create items, WP_Error object otherwise.
+ */
+ public function create_item_permissions_check( $request ) {
+ return new WP_Error( 'invalid-method', sprintf( __( "Method '%s' not implemented. Must be overridden in subclass." ), __METHOD__ ), array( 'status' => 405 ) );
+ }
+
+ /**
+ * Creates one item from the collection.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param WP_REST_Request $request Full data about the request.
+ * @return WP_Error|WP_REST_Response Response object on success, or WP_Error object on failure.
+ */
+ public function create_item( $request ) {
+ return new WP_Error( 'invalid-method', sprintf( __( "Method '%s' not implemented. Must be overridden in subclass." ), __METHOD__ ), array( 'status' => 405 ) );
+ }
+
+ /**
+ * Checks if a given request has access to update a specific item.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param WP_REST_Request $request Full data about the request.
+ * @return WP_Error|bool True if the request has access to update the item, WP_Error object otherwise.
+ */
+ public function update_item_permissions_check( $request ) {
+ return new WP_Error( 'invalid-method', sprintf( __( "Method '%s' not implemented. Must be overridden in subclass." ), __METHOD__ ), array( 'status' => 405 ) );
+ }
+
+ /**
+ * Updates one item from the collection.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param WP_REST_Request $request Full data about the request.
+ * @return WP_Error|WP_REST_Response Response object on success, or WP_Error object on failure.
+ */
+ public function update_item( $request ) {
+ return new WP_Error( 'invalid-method', sprintf( __( "Method '%s' not implemented. Must be overridden in subclass." ), __METHOD__ ), array( 'status' => 405 ) );
+ }
+
+ /**
+ * Checks if a given request has access to delete a specific item.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param WP_REST_Request $request Full data about the request.
+ * @return WP_Error|bool True if the request has access to delete the item, WP_Error object otherwise.
+ */
+ public function delete_item_permissions_check( $request ) {
+ return new WP_Error( 'invalid-method', sprintf( __( "Method '%s' not implemented. Must be overridden in subclass." ), __METHOD__ ), array( 'status' => 405 ) );
+ }
+
+ /**
+ * Deletes one item from the collection.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param WP_REST_Request $request Full data about the request.
+ * @return WP_Error|WP_REST_Response Response object on success, or WP_Error object on failure.
+ */
+ public function delete_item( $request ) {
+ return new WP_Error( 'invalid-method', sprintf( __( "Method '%s' not implemented. Must be overridden in subclass." ), __METHOD__ ), array( 'status' => 405 ) );
+ }
+
+ /**
+ * Prepares one item for create or update operation.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param WP_REST_Request $request Request object.
+ * @return WP_Error|object The prepared item, or WP_Error object on failure.
+ */
+ protected function prepare_item_for_database( $request ) {
+ return new WP_Error( 'invalid-method', sprintf( __( "Method '%s' not implemented. Must be overridden in subclass." ), __METHOD__ ), array( 'status' => 405 ) );
+ }
+
+ /**
+ * Prepares the item for the REST response.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param mixed $item WordPress representation of the item.
+ * @param WP_REST_Request $request Request object.
+ * @return WP_Error|WP_REST_Response Response object on success, or WP_Error object on failure.
+ */
+ public function prepare_item_for_response( $item, $request ) {
+ return new WP_Error( 'invalid-method', sprintf( __( "Method '%s' not implemented. Must be overridden in subclass." ), __METHOD__ ), array( 'status' => 405 ) );
+ }
+
+ /**
+ * Prepares a response for insertion into a collection.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param WP_REST_Response $response Response object.
+ * @return array|mixed Response data, ready for insertion into collection data.
+ */
+ public function prepare_response_for_collection( $response ) {
+ if ( ! ( $response instanceof WP_REST_Response ) ) {
+ return $response;
+ }
+
+ $data = (array) $response->get_data();
+ $server = rest_get_server();
+
+ if ( method_exists( $server, 'get_compact_response_links' ) ) {
+ $links = call_user_func( array( $server, 'get_compact_response_links' ), $response );
+ } else {
+ $links = call_user_func( array( $server, 'get_response_links' ), $response );
+ }
+
+ if ( ! empty( $links ) ) {
+ $data['_links'] = $links;
+ }
+
+ return $data;
+ }
+
+ /**
+ * Filters a response based on the context defined in the schema.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param array $data Response data to fiter.
+ * @param string $context Context defined in the schema.
+ * @return array Filtered response.
+ */
+ public function filter_response_by_context( $data, $context ) {
+
+ $schema = $this->get_item_schema();
+
+ foreach ( $data as $key => $value ) {
+ if ( empty( $schema['properties'][ $key ] ) || empty( $schema['properties'][ $key ]['context'] ) ) {
+ continue;
+ }
+
+ if ( ! in_array( $context, $schema['properties'][ $key ]['context'], true ) ) {
+ unset( $data[ $key ] );
+ continue;
+ }
+
+ if ( 'object' === $schema['properties'][ $key ]['type'] && ! empty( $schema['properties'][ $key ]['properties'] ) ) {
+ foreach ( $schema['properties'][ $key ]['properties'] as $attribute => $details ) {
+ if ( empty( $details['context'] ) ) {
+ continue;
+ }
+
+ if ( ! in_array( $context, $details['context'], true ) ) {
+ if ( isset( $data[ $key ][ $attribute ] ) ) {
+ unset( $data[ $key ][ $attribute ] );
+ }
+ }
+ }
+ }
+ }
+
+ return $data;
+ }
+
+ /**
+ * Retrieves the item's schema, conforming to JSON Schema.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @return array Item schema data.
+ */
+ public function get_item_schema() {
+ return $this->add_additional_fields_schema( array() );
+ }
+
+ /**
+ * Retrieves the item's schema for display / public consumption purposes.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @return array Public item schema data.
+ */
+ public function get_public_item_schema() {
+
+ $schema = $this->get_item_schema();
+
+ foreach ( $schema['properties'] as &$property ) {
+ unset( $property['arg_options'] );
+ }
+
+ return $schema;
+ }
+
+ /**
+ * Retrieves the query params for the collections.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @return array Query parameters for the collection.
+ */
+ public function get_collection_params() {
+ return array(
+ 'context' => $this->get_context_param(),
+ 'page' => array(
+ 'description' => __( 'Current page of the collection.' ),
+ 'type' => 'integer',
+ 'default' => 1,
+ 'sanitize_callback' => 'absint',
+ 'validate_callback' => 'rest_validate_request_arg',
+ 'minimum' => 1,
+ ),
+ 'per_page' => array(
+ 'description' => __( 'Maximum number of items to be returned in result set.' ),
+ 'type' => 'integer',
+ 'default' => 10,
+ 'minimum' => 1,
+ 'maximum' => 100,
+ 'sanitize_callback' => 'absint',
+ 'validate_callback' => 'rest_validate_request_arg',
+ ),
+ 'search' => array(
+ 'description' => __( 'Limit results to those matching a string.' ),
+ 'type' => 'string',
+ 'sanitize_callback' => 'sanitize_text_field',
+ 'validate_callback' => 'rest_validate_request_arg',
+ ),
+ );
+ }
+
+ /**
+ * Retrieves the magical context param.
+ *
+ * Ensures consistent descriptions between endpoints, and populates enum from schema.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param array $args Optional. Additional arguments for context parameter. Default empty array.
+ * @return array Context parameter details.
+ */
+ public function get_context_param( $args = array() ) {
+ $param_details = array(
+ 'description' => __( 'Scope under which the request is made; determines fields present in response.' ),
+ 'type' => 'string',
+ 'sanitize_callback' => 'sanitize_key',
+ 'validate_callback' => 'rest_validate_request_arg',
+ );
+
+ $schema = $this->get_item_schema();
+
+ if ( empty( $schema['properties'] ) ) {
+ return array_merge( $param_details, $args );
+ }
+
+ $contexts = array();
+
+ foreach ( $schema['properties'] as $attributes ) {
+ if ( ! empty( $attributes['context'] ) ) {
+ $contexts = array_merge( $contexts, $attributes['context'] );
+ }
+ }
+
+ if ( ! empty( $contexts ) ) {
+ $param_details['enum'] = array_unique( $contexts );
+ rsort( $param_details['enum'] );
+ }
+
+ return array_merge( $param_details, $args );
+ }
+
+ /**
+ * Adds the values from additional fields to a data object.
+ *
+ * @since 4.7.0
+ * @access protected
+ *
+ * @param array $object Data object.
+ * @param WP_REST_Request $request Full details about the request.
+ * @return array Modified data object with additional fields.
+ */
+ protected function add_additional_fields_to_object( $object, $request ) {
+
+ $additional_fields = $this->get_additional_fields();
+
+ foreach ( $additional_fields as $field_name => $field_options ) {
+
+ if ( ! $field_options['get_callback'] ) {
+ continue;
+ }
+
+ $object[ $field_name ] = call_user_func( $field_options['get_callback'], $object, $field_name, $request, $this->get_object_type() );
+ }
+
+ return $object;
+ }
+
+ /**
+ * Updates the values of additional fields added to a data object.
+ *
+ * @since 4.7.0
+ * @access protected
+ *
+ * @param array $object Data Object.
+ * @param WP_REST_Request $request Full details about the request.
+ * @return bool|WP_Error True on success, WP_Error object if a field cannot be updated.
+ */
+ protected function update_additional_fields_for_object( $object, $request ) {
+ $additional_fields = $this->get_additional_fields();
+
+ foreach ( $additional_fields as $field_name => $field_options ) {
+ if ( ! $field_options['update_callback'] ) {
+ continue;
+ }
+
+ // Don't run the update callbacks if the data wasn't passed in the request.
+ if ( ! isset( $request[ $field_name ] ) ) {
+ continue;
+ }
+
+ $result = call_user_func( $field_options['update_callback'], $request[ $field_name ], $object, $field_name, $request, $this->get_object_type() );
+
+ if ( is_wp_error( $result ) ) {
+ return $result;
+ }
+ }
+
+ return true;
+ }
+
+ /**
+ * Adds the schema from additional fields to a schema array.
+ *
+ * The type of object is inferred from the passed schema.
+ *
+ * @since 4.7.0
+ * @access protected
+ *
+ * @param array $schema Schema array.
+ * @return array Modified Schema array.
+ */
+ protected function add_additional_fields_schema( $schema ) {
+ if ( empty( $schema['title'] ) ) {
+ return $schema;
+ }
+
+ // Can't use $this->get_object_type otherwise we cause an inf loop.
+ $object_type = $schema['title'];
+
+ $additional_fields = $this->get_additional_fields( $object_type );
+
+ foreach ( $additional_fields as $field_name => $field_options ) {
+ if ( ! $field_options['schema'] ) {
+ continue;
+ }
+
+ $schema['properties'][ $field_name ] = $field_options['schema'];
+ }
+
+ return $schema;
+ }
+
+ /**
+ * Retrieves all of the registered additional fields for a given object-type.
+ *
+ * @since 4.7.0
+ * @access protected
+ *
+ * @param string $object_type Optional. The object type.
+ * @return array Registered additional fields (if any), empty array if none or if the object type could
+ * not be inferred.
+ */
+ protected function get_additional_fields( $object_type = null ) {
+
+ if ( ! $object_type ) {
+ $object_type = $this->get_object_type();
+ }
+
+ if ( ! $object_type ) {
+ return array();
+ }
+
+ global $wp_rest_additional_fields;
+
+ if ( ! $wp_rest_additional_fields || ! isset( $wp_rest_additional_fields[ $object_type ] ) ) {
+ return array();
+ }
+
+ return $wp_rest_additional_fields[ $object_type ];
+ }
+
+ /**
+ * Retrieves the object type this controller is responsible for managing.
+ *
+ * @since 4.7.0
+ * @access protected
+ *
+ * @return string Object type for the controller.
+ */
+ protected function get_object_type() {
+ $schema = $this->get_item_schema();
+
+ if ( ! $schema || ! isset( $schema['title'] ) ) {
+ return null;
+ }
+
+ return $schema['title'];
+ }
+
+ /**
+ * Retrieves an array of endpoint arguments from the item schema for the controller.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @param string $method Optional. HTTP method of the request. The arguments for `CREATABLE` requests are
+ * checked for required values and may fall-back to a given default, this is not done
+ * on `EDITABLE` requests. Default WP_REST_Server::CREATABLE.
+ * @return array Endpoint arguments.
+ */
+ public function get_endpoint_args_for_item_schema( $method = WP_REST_Server::CREATABLE ) {
+
+ $schema = $this->get_item_schema();
+ $schema_properties = ! empty( $schema['properties'] ) ? $schema['properties'] : array();
+ $endpoint_args = array();
+
+ foreach ( $schema_properties as $field_id => $params ) {
+
+ // Arguments specified as `readonly` are not allowed to be set.
+ if ( ! empty( $params['readonly'] ) ) {
+ continue;
+ }
+
+ $endpoint_args[ $field_id ] = array(
+ 'validate_callback' => 'rest_validate_request_arg',
+ 'sanitize_callback' => 'rest_sanitize_request_arg',
+ );
+
+ if ( isset( $params['description'] ) ) {
+ $endpoint_args[ $field_id ]['description'] = $params['description'];
+ }
+
+ if ( WP_REST_Server::CREATABLE === $method && isset( $params['default'] ) ) {
+ $endpoint_args[ $field_id ]['default'] = $params['default'];
+ }
+
+ if ( WP_REST_Server::CREATABLE === $method && ! empty( $params['required'] ) ) {
+ $endpoint_args[ $field_id ]['required'] = true;
+ }
+
+ foreach ( array( 'type', 'format', 'enum', 'items' ) as $schema_prop ) {
+ if ( isset( $params[ $schema_prop ] ) ) {
+ $endpoint_args[ $field_id ][ $schema_prop ] = $params[ $schema_prop ];
+ }
+ }
+
+ // Merge in any options provided by the schema property.
+ if ( isset( $params['arg_options'] ) ) {
+
+ // Only use required / default from arg_options on CREATABLE endpoints.
+ if ( WP_REST_Server::CREATABLE !== $method ) {
+ $params['arg_options'] = array_diff_key( $params['arg_options'], array( 'required' => '', 'default' => '' ) );
+ }
+
+ $endpoint_args[ $field_id ] = array_merge( $endpoint_args[ $field_id ], $params['arg_options'] );
+ }
+ }
+
+ return $endpoint_args;
+ }
+
+ /**
+ * Sanitizes the slug value.
+ *
+ * @since 4.7.0
+ * @access public
+ *
+ * @internal We can't use sanitize_title() directly, as the second
+ * parameter is the fallback title, which would end up being set to the
+ * request object.
+ *
+ * @see https://github.com/WP-API/WP-API/issues/1585
+ *
+ * @todo Remove this in favour of https://core.trac.wordpress.org/ticket/34659
+ *
+ * @param string $slug Slug value passed in request.
+ * @return string Sanitized value for the slug.
+ */
+ public function sanitize_slug( $slug ) {
+ return sanitize_title( $slug );
+ }
+}
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