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File Name : class-wp-rest-meta-fields.php

<?php
/**
 * REST API: WP_REST_Meta_Fields class
 *
 * @package WordPress
 * @subpackage REST_API
 * @since 4.7.0
 */

/**
 * Core class to manage meta values for an object via the REST API.
 *
 * @since 4.7.0
 */
abstract class WP_REST_Meta_Fields {

/**
	 * Retrieves the object meta type.
	 *
	 * @since 4.7.0
	 *
	 * @return string One of 'post', 'comment', 'term', 'user', or anything
	 *                else supported by `_get_meta_table()`.
	 */
	abstract protected function get_meta_type();

/**
	 * Retrieves the object meta subtype.
	 *
	 * @since 4.9.8
	 *
	 * @return string Subtype for the meta type, or empty string if no specific subtype.
	 */
	protected function get_meta_subtype() {
		return '';
	}

/**
	 * Retrieves the object type for register_rest_field().
	 *
	 * @since 4.7.0
	 *
	 * @return string The REST field type, such as post type name, taxonomy name, 'comment', or `user`.
	 */
	abstract protected function get_rest_field_type();

/**
	 * Registers the meta field.
	 *
	 * @since 4.7.0
	 *
	 * @see register_rest_field()
	 */
	public function register_field() {
		register_rest_field(
			$this->get_rest_field_type(),
			'meta',
			array(
				'get_callback'    => array( $this, 'get_value' ),
				'update_callback' => array( $this, 'update_value' ),
				'schema'          => $this->get_field_schema(),
			)
		);
	}

/**
	 * Retrieves the meta field value.
	 *
	 * @since 4.7.0
	 *
	 * @param int             $object_id Object ID to fetch meta for.
	 * @param WP_REST_Request $request   Full details about the request.
	 * @return WP_Error|object Object containing the meta values by name, otherwise WP_Error object.
	 */
	public function get_value( $object_id, $request ) {
		$fields   = $this->get_registered_fields();
		$response = array();

foreach ( $fields as $meta_key => $args ) {
			$name       = $args['name'];
			$all_values = get_metadata( $this->get_meta_type(), $object_id, $meta_key, false );
			if ( $args['single'] ) {
				if ( empty( $all_values ) ) {
					$value = $args['schema']['default'];
				} else {
					$value = $all_values[0];
				}
				$value = $this->prepare_value_for_response( $value, $request, $args );
			} else {
				$value = array();
				foreach ( $all_values as $row ) {
					$value[] = $this->prepare_value_for_response( $row, $request, $args );
				}
			}

$response[ $name ] = $value;
		}

return $response;
	}

/**
	 * Prepares a meta value for a response.
	 *
	 * This is required because some native types cannot be stored correctly
	 * in the database, such as booleans. We need to cast back to the relevant
	 * type before passing back to JSON.
	 *
	 * @since 4.7.0
	 *
	 * @param mixed           $value   Meta value to prepare.
	 * @param WP_REST_Request $request Current request object.
	 * @param array           $args    Options for the field.
	 * @return mixed Prepared value.
	 */
	protected function prepare_value_for_response( $value, $request, $args ) {
		if ( ! empty( $args['prepare_callback'] ) ) {
			$value = call_user_func( $args['prepare_callback'], $value, $request, $args );
		}

return $value;
	}

/**
	 * Updates meta values.
	 *
	 * @since 4.7.0
	 *
	 * @param array           $meta      Array of meta parsed from the request.
	 * @param int             $object_id Object ID to fetch meta for.
	 * @return WP_Error|null WP_Error if one occurs, null on success.
	 */
	public function update_value( $meta, $object_id ) {
		$fields = $this->get_registered_fields();
		foreach ( $fields as $meta_key => $args ) {
			$name = $args['name'];
			if ( ! array_key_exists( $name, $meta ) ) {
				continue;
			}

/*
			 * A null value means reset the field, which is essentially deleting it
			 * from the database and then relying on the default value.
			 */
			if ( is_null( $meta[ $name ] ) ) {
				$result = $this->delete_meta_value( $object_id, $meta_key, $name );
				if ( is_wp_error( $result ) ) {
					return $result;
				}
				continue;
			}

$is_valid = rest_validate_value_from_schema( $meta[ $name ], $args['schema'], 'meta.' . $name );
			if ( is_wp_error( $is_valid ) ) {
				$is_valid->add_data( array( 'status' => 400 ) );
				return $is_valid;
			}

$value = rest_sanitize_value_from_schema( $meta[ $name ], $args['schema'] );

if ( $args['single'] ) {
				$result = $this->update_meta_value( $object_id, $meta_key, $name, $value );
			} else {
				$result = $this->update_multi_meta_value( $object_id, $meta_key, $name, $value );
			}

if ( is_wp_error( $result ) ) {
				return $result;
			}
		}

return null;
	}

/**
	 * Deletes a meta value for an object.
	 *
	 * @since 4.7.0
	 *
	 * @param int    $object_id Object ID the field belongs to.
	 * @param string $meta_key  Key for the field.
	 * @param string $name      Name for the field that is exposed in the REST API.
	 * @return bool|WP_Error True if meta field is deleted, WP_Error otherwise.
	 */
	protected function delete_meta_value( $object_id, $meta_key, $name ) {
		$meta_type = $this->get_meta_type();
		if ( ! current_user_can( "delete_{$meta_type}_meta", $object_id, $meta_key ) ) {
			return new WP_Error(
				'rest_cannot_delete',
				/* translators: %s: custom field key */
				sprintf( __( 'Sorry, you are not allowed to edit the %s custom field.' ), $name ),
				array(
					'key'    => $name,
					'status' => rest_authorization_required_code(),
				)
			);
		}

if ( ! delete_metadata( $meta_type, $object_id, wp_slash( $meta_key ) ) ) {
			return new WP_Error(
				'rest_meta_database_error',
				__( 'Could not delete meta value from database.' ),
				array(
					'key'    => $name,
					'status' => WP_Http::INTERNAL_SERVER_ERROR,
				)
			);
		}

return true;
	}

/**
	 * Updates multiple meta values for an object.
	 *
	 * Alters the list of values in the database to match the list of provided values.
	 *
	 * @since 4.7.0
	 *
	 * @param int    $object_id Object ID to update.
	 * @param string $meta_key  Key for the custom field.
	 * @param string $name      Name for the field that is exposed in the REST API.
	 * @param array  $values    List of values to update to.
	 * @return bool|WP_Error True if meta fields are updated, WP_Error otherwise.
	 */
	protected function update_multi_meta_value( $object_id, $meta_key, $name, $values ) {
		$meta_type = $this->get_meta_type();
		if ( ! current_user_can( "edit_{$meta_type}_meta", $object_id, $meta_key ) ) {
			return new WP_Error(
				'rest_cannot_update',
				/* translators: %s: custom field key */
				sprintf( __( 'Sorry, you are not allowed to edit the %s custom field.' ), $name ),
				array(
					'key'    => $name,
					'status' => rest_authorization_required_code(),
				)
			);
		}

$current = get_metadata( $meta_type, $object_id, $meta_key, false );

$to_remove = $current;
		$to_add    = $values;

foreach ( $to_add as $add_key => $value ) {
			$remove_keys = array_keys( $to_remove, $value, true );

if ( empty( $remove_keys ) ) {
				continue;
			}

if ( count( $remove_keys ) > 1 ) {
				// To remove, we need to remove first, then add, so don't touch.
				continue;
			}

$remove_key = $remove_keys[0];

unset( $to_remove[ $remove_key ] );
			unset( $to_add[ $add_key ] );
		}

// `delete_metadata` removes _all_ instances of the value, so only call once.
		$to_remove = array_unique( $to_remove );

foreach ( $to_remove as $value ) {
			if ( ! delete_metadata( $meta_type, $object_id, wp_slash( $meta_key ), wp_slash( $value ) ) ) {
				return new WP_Error(
					'rest_meta_database_error',
					__( 'Could not update meta value in database.' ),
					array(
						'key'    => $name,
						'status' => WP_Http::INTERNAL_SERVER_ERROR,
					)
				);
			}
		}

foreach ( $to_add as $value ) {
			if ( ! add_metadata( $meta_type, $object_id, wp_slash( $meta_key ), wp_slash( $value ) ) ) {
				return new WP_Error(
					'rest_meta_database_error',
					__( 'Could not update meta value in database.' ),
					array(
						'key'    => $name,
						'status' => WP_Http::INTERNAL_SERVER_ERROR,
					)
				);
			}
		}

return true;
	}

/**
	 * Updates a meta value for an object.
	 *
	 * @since 4.7.0
	 *
	 * @param int    $object_id Object ID to update.
	 * @param string $meta_key  Key for the custom field.
	 * @param string $name      Name for the field that is exposed in the REST API.
	 * @param mixed  $value     Updated value.
	 * @return bool|WP_Error True if the meta field was updated, WP_Error otherwise.
	 */
	protected function update_meta_value( $object_id, $meta_key, $name, $value ) {
		$meta_type = $this->get_meta_type();
		if ( ! current_user_can( "edit_{$meta_type}_meta", $object_id, $meta_key ) ) {
			return new WP_Error(
				'rest_cannot_update',
				/* translators: %s: custom field key */
				sprintf( __( 'Sorry, you are not allowed to edit the %s custom field.' ), $name ),
				array(
					'key'    => $name,
					'status' => rest_authorization_required_code(),
				)
			);
		}

// Do the exact same check for a duplicate value as in update_metadata() to avoid update_metadata() returning false.
		$old_value = get_metadata( $meta_type, $object_id, $meta_key );
		$subtype   = get_object_subtype( $meta_type, $object_id );

if ( 1 === count( $old_value ) ) {
			if ( (string) sanitize_meta( $meta_key, $value, $meta_type, $subtype ) === $old_value[0] ) {
				return true;
			}
		}

if ( ! update_metadata( $meta_type, $object_id, wp_slash( $meta_key ), wp_slash( $value ) ) ) {
			return new WP_Error(
				'rest_meta_database_error',
				__( 'Could not update meta value in database.' ),
				array(
					'key'    => $name,
					'status' => WP_Http::INTERNAL_SERVER_ERROR,
				)
			);
		}

return true;
	}

/**
	 * Retrieves all the registered meta fields.
	 *
	 * @since 4.7.0
	 *
	 * @return array Registered fields.
	 */
	protected function get_registered_fields() {
		$registered = array();

$meta_type    = $this->get_meta_type();
		$meta_subtype = $this->get_meta_subtype();

$meta_keys = get_registered_meta_keys( $meta_type );
		if ( ! empty( $meta_subtype ) ) {
			$meta_keys = array_merge( $meta_keys, get_registered_meta_keys( $meta_type, $meta_subtype ) );
		}

foreach ( $meta_keys as $name => $args ) {
			if ( empty( $args['show_in_rest'] ) ) {
				continue;
			}

$rest_args = array();

if ( is_array( $args['show_in_rest'] ) ) {
				$rest_args = $args['show_in_rest'];
			}

$default_args = array(
				'name'             => $name,
				'single'           => $args['single'],
				'type'             => ! empty( $args['type'] ) ? $args['type'] : null,
				'schema'           => array(),
				'prepare_callback' => array( $this, 'prepare_value' ),
			);

$default_schema = array(
				'type'        => $default_args['type'],
				'description' => empty( $args['description'] ) ? '' : $args['description'],
				'default'     => isset( $args['default'] ) ? $args['default'] : null,
			);

$rest_args           = array_merge( $default_args, $rest_args );
			$rest_args['schema'] = array_merge( $default_schema, $rest_args['schema'] );

$type = ! empty( $rest_args['type'] ) ? $rest_args['type'] : null;
			$type = ! empty( $rest_args['schema']['type'] ) ? $rest_args['schema']['type'] : $type;

if ( ! in_array( $type, array( 'string', 'boolean', 'integer', 'number' ) ) ) {
				continue;
			}

if ( empty( $rest_args['single'] ) ) {
				$rest_args['schema']['items'] = array(
					'type' => $rest_args['type'],
				);
				$rest_args['schema']['type']  = 'array';
			}

$registered[ $name ] = $rest_args;
		}

return $registered;
	}

/**
	 * Retrieves the object's meta schema, conforming to JSON Schema.
	 *
	 * @since 4.7.0
	 *
	 * @return array Field schema data.
	 */
	public function get_field_schema() {
		$fields = $this->get_registered_fields();

$schema = array(
			'description' => __( 'Meta fields.' ),
			'type'        => 'object',
			'context'     => array( 'view', 'edit' ),
			'properties'  => array(),
			'arg_options' => array(
				'sanitize_callback' => null,
				'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 ) {
		$type = $args['schema']['type'];

// For multi-value fields, check the item type instead.
		if ( 'array' === $type && ! empty( $args['schema']['items']['type'] ) ) {
			$type = $args['schema']['items']['type'];
		}

switch ( $type ) {
			case 'string':
				$value = (string) $value;
				break;
			case 'integer':
				$value = (int) $value;
				break;
			case 'number':
				$value = (float) $value;
				break;
			case 'boolean':
				$value = (bool) $value;
				break;
		}

// Don't allow objects to be output.
		if ( is_object( $value ) && ! ( $value instanceof JsonSerializable ) ) {
			return null;
		}

return $value;
	}

/**
	 * 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 WP_Error|string The meta array, if valid, otherwise an error.
	 */
	public function check_meta_is_array( $value, $request, $param ) {
		if ( ! is_array( $value ) ) {
			return false;
		}

return $value;
	}
}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-12-01 08:55:22
..	dir	-	root/root	0755	2025-12-01 08:55:22
class-wp-rest-comment-meta-fields.php	text/x-php	893 B	root/root	0644	2025-11-28 12:18:58
class-wp-rest-meta-fields.php	text/x-php	13.55 KB	root/root	0644	2025-11-28 12:18:58
class-wp-rest-post-meta-fields.php	text/x-php	1.22 KB	root/root	0644	2025-11-28 12:18:58
class-wp-rest-term-meta-fields.php	text/x-php	1.22 KB	root/root	0644	2025-11-28 12:18:58
class-wp-rest-user-meta-fields.php	text/x-php	860 B	root/root	0644	2025-11-28 12:18:58

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