617 lines
18 KiB
PHP
617 lines
18 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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* @deprecated 5.6.0
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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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_deprecated_function( __METHOD__, '5.6.0' );
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register_rest_field(
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$this->get_rest_field_type(),
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'meta',
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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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/**
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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 array Array containing the meta values keyed by name.
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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 null|WP_Error Null on success, WP_Error object on failure.
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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, $meta ) ) {
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continue;
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}
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$value = $meta[ $name ];
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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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* Non-single meta can also be removed by passing an empty array.
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*/
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if ( is_null( $value ) || ( array() === $value && ! $args['single'] ) ) {
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$args = $this->get_registered_fields()[ $meta_key ];
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if ( $args['single'] ) {
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$current = get_metadata( $this->get_meta_type(), $object_id, $meta_key, true );
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if ( is_wp_error( rest_validate_value_from_schema( $current, $args['schema'] ) ) ) {
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return new WP_Error(
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'rest_invalid_stored_value',
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/* translators: %s: Custom field key. */
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sprintf( __( 'The %s property has an invalid stored value, and cannot be updated to null.' ), $name ),
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array( 'status' => 500 )
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);
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}
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}
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$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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if ( ! $args['single'] && is_array( $value ) && count( array_filter( $value, 'is_null' ) ) ) {
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return new WP_Error(
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'rest_invalid_stored_value',
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/* translators: %s: Custom field key. */
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sprintf( __( 'The %s property has an invalid stored value, and cannot be updated to null.' ), $name ),
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array( 'status' => 500 )
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);
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}
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$is_valid = rest_validate_value_from_schema( $value, $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( $value, $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 true|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(
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'key' => $name,
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'status' => rest_authorization_required_code(),
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)
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);
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}
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if ( null === get_metadata_raw( $meta_type, $object_id, wp_slash( $meta_key ) ) ) {
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return true;
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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(
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'key' => $name,
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'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 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 true|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(
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'key' => $name,
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'status' => rest_authorization_required_code(),
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)
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);
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}
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$current_values = get_metadata( $meta_type, $object_id, $meta_key, false );
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$subtype = get_object_subtype( $meta_type, $object_id );
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$to_remove = $current_values;
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$to_add = $values;
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foreach ( $to_add as $add_key => $value ) {
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$remove_keys = array_keys(
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array_filter(
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$current_values,
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function ( $stored_value ) use ( $meta_key, $subtype, $value ) {
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return $this->is_meta_value_same_as_stored_value( $meta_key, $subtype, $stored_value, $value );
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}
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)
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);
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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[ $add_key ] );
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}
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/*
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* `delete_metadata` removes _all_ instances of the value, so only call once. Otherwise,
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* `delete_metadata` will return false for subsequent calls of the same value.
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* Use serialization to produce a predictable string that can be used by array_unique.
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*/
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$to_remove = array_map( 'maybe_unserialize', array_unique( array_map( 'maybe_serialize', $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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/* translators: %s: Custom field key. */
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sprintf( __( 'Could not update the meta value of %s in database.' ), $meta_key ),
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array(
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'key' => $name,
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'status' => WP_Http::INTERNAL_SERVER_ERROR,
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)
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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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/* translators: %s: Custom field key. */
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sprintf( __( 'Could not update the meta value of %s in database.' ), $meta_key ),
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array(
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'key' => $name,
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'status' => WP_Http::INTERNAL_SERVER_ERROR,
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)
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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 true|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(
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'key' => $name,
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'status' => rest_authorization_required_code(),
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)
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);
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}
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// Do the exact same check for a duplicate value as in update_metadata() to avoid update_metadata() returning false.
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$old_value = get_metadata( $meta_type, $object_id, $meta_key );
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$subtype = get_object_subtype( $meta_type, $object_id );
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if ( 1 === count( $old_value ) && $this->is_meta_value_same_as_stored_value( $meta_key, $subtype, $old_value[0], $value ) ) {
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return true;
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}
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if ( ! update_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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/* translators: %s: Custom field key. */
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sprintf( __( 'Could not update the meta value of %s in database.' ), $meta_key ),
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array(
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'key' => $name,
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'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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* Checks if the user provided value is equivalent to a stored value for the given meta key.
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*
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* @since 5.5.0
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*
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* @param string $meta_key The meta key being checked.
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* @param string $subtype The object subtype.
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* @param mixed $stored_value The currently stored value retrieved from get_metadata().
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* @param mixed $user_value The value provided by the user.
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* @return bool
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*/
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protected function is_meta_value_same_as_stored_value( $meta_key, $subtype, $stored_value, $user_value ) {
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$args = $this->get_registered_fields()[ $meta_key ];
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$sanitized = sanitize_meta( $meta_key, $user_value, $this->get_meta_type(), $subtype );
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if ( in_array( $args['type'], array( 'string', 'number', 'integer', 'boolean' ), true ) ) {
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// The return value of get_metadata will always be a string for scalar types.
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$sanitized = (string) $sanitized;
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}
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return $sanitized === $stored_value;
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}
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/**
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* Retrieves all the registered meta fields.
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*
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* @since 4.7.0
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*
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* @return array Registered fields.
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*/
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protected function get_registered_fields() {
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$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 ( null === $rest_args['schema']['default'] ) {
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$rest_args['schema']['default'] = static::get_empty_value_for_type( $type );
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}
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$rest_args['schema'] = rest_default_additional_properties_to_false( $rest_args['schema'] );
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if ( ! in_array( $type, array( 'string', 'boolean', 'integer', 'number', 'array', 'object' ), true ) ) {
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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'] = array(
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'type' => 'array',
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'items' => $rest_args['schema'],
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);
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}
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$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' ),
|
|
),
|
|
);
|
|
|
|
foreach ( $fields as $args ) {
|
|
$schema['properties'][ $args['name'] ] = $args['schema'];
|
|
}
|
|
|
|
return $schema;
|
|
}
|
|
|
|
/**
|
|
* Prepares a meta value for output.
|
|
*
|
|
* Default preparation for meta fields. Override by passing the
|
|
* `prepare_callback` in your `show_in_rest` options.
|
|
*
|
|
* @since 4.7.0
|
|
*
|
|
* @param mixed $value Meta value from the database.
|
|
* @param WP_REST_Request $request Request object.
|
|
* @param array $args REST-specific options for the meta key.
|
|
* @return mixed Value prepared for output. If a non-JsonSerializable object, null.
|
|
*/
|
|
public static function prepare_value( $value, $request, $args ) {
|
|
if ( $args['single'] ) {
|
|
$schema = $args['schema'];
|
|
} else {
|
|
$schema = $args['schema']['items'];
|
|
}
|
|
|
|
if ( '' === $value && in_array( $schema['type'], array( 'boolean', 'integer', 'number' ), true ) ) {
|
|
$value = static::get_empty_value_for_type( $schema['type'] );
|
|
}
|
|
|
|
if ( is_wp_error( rest_validate_value_from_schema( $value, $schema ) ) ) {
|
|
return null;
|
|
}
|
|
|
|
return rest_sanitize_value_from_schema( $value, $schema );
|
|
}
|
|
|
|
/**
|
|
* Check the 'meta' value of a request is an associative array.
|
|
*
|
|
* @since 4.7.0
|
|
*
|
|
* @param mixed $value The meta value submitted in the request.
|
|
* @param WP_REST_Request $request Full details about the request.
|
|
* @param string $param The parameter name.
|
|
* @return array|false The meta array, if valid, false otherwise.
|
|
*/
|
|
public function check_meta_is_array( $value, $request, $param ) {
|
|
if ( ! is_array( $value ) ) {
|
|
return false;
|
|
}
|
|
|
|
return $value;
|
|
}
|
|
|
|
/**
|
|
* Recursively add additionalProperties = false to all objects in a schema if no additionalProperties setting
|
|
* is specified.
|
|
*
|
|
* This is needed to restrict properties of objects in meta values to only
|
|
* registered items, as the REST API will allow additional properties by
|
|
* default.
|
|
*
|
|
* @since 5.3.0
|
|
* @deprecated 5.6.0 Use rest_default_additional_properties_to_false() instead.
|
|
*
|
|
* @param array $schema The schema array.
|
|
* @return array
|
|
*/
|
|
protected function default_additional_properties_to_false( $schema ) {
|
|
_deprecated_function( __METHOD__, '5.6.0', 'rest_default_additional_properties_to_false()' );
|
|
|
|
return rest_default_additional_properties_to_false( $schema );
|
|
}
|
|
|
|
/**
|
|
* Gets the empty value for a schema type.
|
|
*
|
|
* @since 5.3.0
|
|
*
|
|
* @param string $type The schema type.
|
|
* @return mixed
|
|
*/
|
|
protected static function get_empty_value_for_type( $type ) {
|
|
switch ( $type ) {
|
|
case 'string':
|
|
return '';
|
|
case 'boolean':
|
|
return false;
|
|
case 'integer':
|
|
return 0;
|
|
case 'number':
|
|
return 0.0;
|
|
case 'array':
|
|
case 'object':
|
|
return array();
|
|
default:
|
|
return null;
|
|
}
|
|
}
|
|
}
|