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2afa2b446f
Introduce an object_subtype argument to the args array for register_meta() which can be used to limit meta registration to a single subtype (e.g. a custom post type or taxonomy, vs all posts or taxonomies). Introduce register_post_meta() and register_term_meta() wrapper methods for register_meta to provide a convenient interface for the common case of registering meta for a specific taxonomy or post type. These methods work the way plugin developers have often expected register_meta to function, and should be used in place of direct register_meta where possible. Props flixos90, tharsheblows, spacedmonkey. Merges [43378] to the 4.9 branch. Fixes #38323. Built from https://develop.svn.wordpress.org/branches/4.9@43510 git-svn-id: http://core.svn.wordpress.org/branches/4.9@43339 1a063a9b-81f0-0310-95a4-ce76da25c4cd
477 lines
13 KiB
PHP
477 lines
13 KiB
PHP
<?php
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/**
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* REST API: WP_REST_Meta_Fields 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 to manage meta values for an object via the REST API.
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*
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* @since 4.7.0
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*/
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abstract class WP_REST_Meta_Fields {
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/**
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* Retrieves the object meta type.
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*
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* @since 4.7.0
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*
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* @return string One of 'post', 'comment', 'term', 'user', or anything
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* else supported by `_get_meta_table()`.
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*/
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abstract protected function get_meta_type();
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/**
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* Retrieves the object meta subtype.
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*
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* @since 4.9.8
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*
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* @return string Subtype for the meta type, or empty string if no specific subtype.
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*/
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protected function get_meta_subtype() {
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return '';
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}
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/**
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* Retrieves the object type for register_rest_field().
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*
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* @since 4.7.0
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*
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* @return string The REST field type, such as post type name, taxonomy name, 'comment', or `user`.
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*/
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abstract protected function get_rest_field_type();
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/**
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* Registers the meta field.
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*
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* @since 4.7.0
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*
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* @see register_rest_field()
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*/
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public function register_field() {
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register_rest_field( $this->get_rest_field_type(), 'meta', array(
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'get_callback' => array( $this, 'get_value' ),
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'update_callback' => array( $this, 'update_value' ),
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'schema' => $this->get_field_schema(),
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));
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}
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/**
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* Retrieves the meta field value.
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*
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* @since 4.7.0
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*
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* @param int $object_id Object ID to fetch meta for.
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* @param WP_REST_Request $request Full details about the request.
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* @return WP_Error|object Object containing the meta values by name, otherwise WP_Error object.
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*/
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public function get_value( $object_id, $request ) {
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$fields = $this->get_registered_fields();
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$response = array();
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foreach ( $fields as $meta_key => $args ) {
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$name = $args['name'];
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$all_values = get_metadata( $this->get_meta_type(), $object_id, $meta_key, false );
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if ( $args['single'] ) {
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if ( empty( $all_values ) ) {
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$value = $args['schema']['default'];
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} else {
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$value = $all_values[0];
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}
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$value = $this->prepare_value_for_response( $value, $request, $args );
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} else {
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$value = array();
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foreach ( $all_values as $row ) {
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$value[] = $this->prepare_value_for_response( $row, $request, $args );
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}
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}
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$response[ $name ] = $value;
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}
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return $response;
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}
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/**
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* Prepares a meta value for a response.
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*
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* This is required because some native types cannot be stored correctly
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* in the database, such as booleans. We need to cast back to the relevant
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* type before passing back to JSON.
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*
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* @since 4.7.0
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*
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* @param mixed $value Meta value to prepare.
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* @param WP_REST_Request $request Current request object.
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* @param array $args Options for the field.
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* @return mixed Prepared value.
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*/
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protected function prepare_value_for_response( $value, $request, $args ) {
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if ( ! empty( $args['prepare_callback'] ) ) {
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$value = call_user_func( $args['prepare_callback'], $value, $request, $args );
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}
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return $value;
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}
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/**
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* Updates meta values.
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*
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* @since 4.7.0
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*
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* @param array $meta Array of meta parsed from the request.
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* @param int $object_id Object ID to fetch meta for.
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* @return WP_Error|null WP_Error if one occurs, null on success.
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*/
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public function update_value( $meta, $object_id ) {
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$fields = $this->get_registered_fields();
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foreach ( $fields as $meta_key => $args ) {
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$name = $args['name'];
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if ( ! array_key_exists( $name, $meta ) ) {
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continue;
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}
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/*
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* A null value means reset the field, which is essentially deleting it
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* from the database and then relying on the default value.
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*/
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if ( is_null( $meta[ $name ] ) ) {
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$result = $this->delete_meta_value( $object_id, $meta_key, $name );
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if ( is_wp_error( $result ) ) {
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return $result;
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}
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continue;
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}
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$is_valid = rest_validate_value_from_schema( $meta[ $name ], $args['schema'], 'meta.' . $name );
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if ( is_wp_error( $is_valid ) ) {
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$is_valid->add_data( array( 'status' => 400 ) );
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return $is_valid;
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}
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$value = rest_sanitize_value_from_schema( $meta[ $name ], $args['schema'] );
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if ( $args['single'] ) {
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$result = $this->update_meta_value( $object_id, $meta_key, $name, $value );
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} else {
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$result = $this->update_multi_meta_value( $object_id, $meta_key, $name, $value );
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}
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if ( is_wp_error( $result ) ) {
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return $result;
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}
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}
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return null;
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}
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/**
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* Deletes a meta value for an object.
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*
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* @since 4.7.0
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*
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* @param int $object_id Object ID the field belongs to.
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* @param string $meta_key Key for the field.
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* @param string $name Name for the field that is exposed in the REST API.
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* @return bool|WP_Error True if meta field is deleted, WP_Error otherwise.
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*/
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protected function delete_meta_value( $object_id, $meta_key, $name ) {
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$meta_type = $this->get_meta_type();
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if ( ! current_user_can( "delete_{$meta_type}_meta", $object_id, $meta_key ) ) {
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return new WP_Error(
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'rest_cannot_delete',
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/* translators: %s: custom field key */
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sprintf( __( 'Sorry, you are not allowed to edit the %s custom field.' ), $name ),
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array( 'key' => $name, 'status' => rest_authorization_required_code() )
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);
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}
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if ( ! delete_metadata( $meta_type, $object_id, wp_slash( $meta_key ) ) ) {
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return new WP_Error(
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'rest_meta_database_error',
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__( 'Could not delete meta value from database.' ),
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array( 'key' => $name, 'status' => WP_Http::INTERNAL_SERVER_ERROR )
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);
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}
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return true;
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}
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/**
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* Updates multiple meta values for an object.
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*
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* Alters the list of values in the database to match the list of provided values.
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*
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* @since 4.7.0
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*
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* @param int $object_id Object ID to update.
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* @param string $meta_key Key for the custom field.
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* @param string $name Name for the field that is exposed in the REST API.
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* @param array $values List of values to update to.
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* @return bool|WP_Error True if meta fields are updated, WP_Error otherwise.
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*/
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protected function update_multi_meta_value( $object_id, $meta_key, $name, $values ) {
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$meta_type = $this->get_meta_type();
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if ( ! current_user_can( "edit_{$meta_type}_meta", $object_id, $meta_key ) ) {
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return new WP_Error(
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'rest_cannot_update',
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/* translators: %s: custom field key */
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sprintf( __( 'Sorry, you are not allowed to edit the %s custom field.' ), $name ),
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array( 'key' => $name, 'status' => rest_authorization_required_code() )
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);
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}
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$current = get_metadata( $meta_type, $object_id, $meta_key, false );
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$to_remove = $current;
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$to_add = $values;
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foreach ( $to_add as $add_key => $value ) {
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$remove_keys = array_keys( $to_remove, $value, true );
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if ( empty( $remove_keys ) ) {
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continue;
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}
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if ( count( $remove_keys ) > 1 ) {
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// To remove, we need to remove first, then add, so don't touch.
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continue;
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}
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$remove_key = $remove_keys[0];
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unset( $to_remove[ $remove_key ] );
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unset( $to_add[ $add_key ] );
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}
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// `delete_metadata` removes _all_ instances of the value, so only call once.
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$to_remove = array_unique( $to_remove );
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foreach ( $to_remove as $value ) {
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if ( ! delete_metadata( $meta_type, $object_id, wp_slash( $meta_key ), wp_slash( $value ) ) ) {
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return new WP_Error(
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'rest_meta_database_error',
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__( 'Could not update meta value in database.' ),
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array( 'key' => $name, 'status' => WP_Http::INTERNAL_SERVER_ERROR )
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);
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}
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}
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foreach ( $to_add as $value ) {
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if ( ! add_metadata( $meta_type, $object_id, wp_slash( $meta_key ), wp_slash( $value ) ) ) {
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return new WP_Error(
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'rest_meta_database_error',
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__( 'Could not update meta value in database.' ),
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array( 'key' => $name, 'status' => WP_Http::INTERNAL_SERVER_ERROR )
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);
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}
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}
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return true;
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}
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/**
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* Updates a meta value for an object.
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*
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* @since 4.7.0
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*
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* @param int $object_id Object ID to update.
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* @param string $meta_key Key for the custom field.
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* @param string $name Name for the field that is exposed in the REST API.
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* @param mixed $value Updated value.
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* @return bool|WP_Error True if the meta field was updated, WP_Error otherwise.
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*/
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protected function update_meta_value( $object_id, $meta_key, $name, $value ) {
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$meta_type = $this->get_meta_type();
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if ( ! current_user_can( "edit_{$meta_type}_meta", $object_id, $meta_key ) ) {
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return new WP_Error(
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'rest_cannot_update',
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/* translators: %s: custom field key */
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sprintf( __( 'Sorry, you are not allowed to edit the %s custom field.' ), $name ),
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array( 'key' => $name, 'status' => rest_authorization_required_code() )
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);
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}
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$meta_key = wp_slash( $meta_key );
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$meta_value = wp_slash( $value );
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// Do the exact same check for a duplicate value as in update_metadata() to avoid update_metadata() returning false.
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$old_value = get_metadata( $meta_type, $object_id, $meta_key );
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if ( 1 === count( $old_value ) ) {
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if ( $old_value[0] === $meta_value ) {
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return true;
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}
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}
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if ( ! update_metadata( $meta_type, $object_id, $meta_key, $meta_value ) ) {
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return new WP_Error(
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'rest_meta_database_error',
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__( 'Could not update meta value in database.' ),
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array( 'key' => $name, 'status' => WP_Http::INTERNAL_SERVER_ERROR )
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);
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}
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return true;
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}
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/**
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* Retrieves all the registered meta fields.
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*
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* @since 4.7.0
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*
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* @return array Registered fields.
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*/
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protected function get_registered_fields() {
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$registered = array();
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$meta_type = $this->get_meta_type();
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$meta_subtype = $this->get_meta_subtype();
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$meta_keys = get_registered_meta_keys( $meta_type );
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if ( ! empty( $meta_subtype ) ) {
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$meta_keys = array_merge( $meta_keys, get_registered_meta_keys( $meta_type, $meta_subtype ) );
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}
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foreach ( $meta_keys 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 = $args['show_in_rest'];
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}
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$default_args = array(
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'name' => $name,
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'single' => $args['single'],
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'type' => ! empty( $args['type'] ) ? $args['type'] : null,
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'schema' => array(),
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'prepare_callback' => array( $this, 'prepare_value' ),
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);
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$default_schema = array(
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'type' => $default_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 = array_merge( $default_args, $rest_args );
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$rest_args['schema'] = array_merge( $default_schema, $rest_args['schema'] );
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$type = ! empty( $rest_args['type'] ) ? $rest_args['type'] : null;
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$type = ! empty( $rest_args['schema']['type'] ) ? $rest_args['schema']['type'] : $type;
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if ( ! in_array( $type, array( 'string', 'boolean', 'integer', 'number' ) ) ) {
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continue;
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}
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if ( empty( $rest_args['single'] ) ) {
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$rest_args['schema']['items'] = array(
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'type' => $rest_args['type'],
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);
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$rest_args['schema']['type'] = 'array';
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}
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$registered[ $name ] = $rest_args;
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}
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return $registered;
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}
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/**
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* Retrieves the object's meta schema, conforming to JSON Schema.
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*
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* @since 4.7.0
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*
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* @return array Field schema data.
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*/
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public function get_field_schema() {
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$fields = $this->get_registered_fields();
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$schema = array(
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'description' => __( 'Meta fields.' ),
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'type' => 'object',
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'context' => array( 'view', 'edit' ),
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'properties' => array(),
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'arg_options' => array(
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'sanitize_callback' => null,
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'validate_callback' => array( $this, 'check_meta_is_array' ),
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),
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);
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foreach ( $fields as $args ) {
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$schema['properties'][ $args['name'] ] = $args['schema'];
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}
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return $schema;
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}
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/**
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* Prepares a meta value for output.
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*
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* Default preparation for meta fields. Override by passing the
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* `prepare_callback` in your `show_in_rest` options.
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*
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* @since 4.7.0
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*
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* @param mixed $value Meta value from the database.
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* @param WP_REST_Request $request Request object.
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* @param array $args REST-specific options for the meta key.
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* @return mixed Value prepared for output. If a non-JsonSerializable object, null.
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*/
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public static function prepare_value( $value, $request, $args ) {
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$type = $args['schema']['type'];
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// For multi-value fields, check the item type instead.
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if ( 'array' === $type && ! empty( $args['schema']['items']['type'] ) ) {
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$type = $args['schema']['items']['type'];
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}
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switch ( $type ) {
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case 'string':
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$value = (string) $value;
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break;
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case 'integer':
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$value = (int) $value;
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break;
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case 'number':
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$value = (float) $value;
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break;
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case 'boolean':
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$value = (bool) $value;
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break;
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}
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// Don't allow objects to be output.
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if ( is_object( $value ) && ! ( $value instanceof JsonSerializable ) ) {
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return null;
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}
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return $value;
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}
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/**
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* Check the 'meta' value of a request is an associative array.
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*
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* @since 4.7.0
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*
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* @param mixed $value The meta value submitted in the request.
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* @param WP_REST_Request $request Full details about the request.
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* @param string $param The parameter name.
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* @return WP_Error|string The meta array, if valid, otherwise an error.
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*/
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public function check_meta_is_array( $value, $request, $param ) {
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if ( ! is_array( $value ) ) {
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return false;
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}
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return $value;
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}
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}
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