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/**
 * 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
 */
#[AllowDynamicProperties]
abstract class WP_REST_Meta_Fields {

	/**
	 * Retrieves the object meta type.
	 *
	 * @since 4.7.0
	 *
	 * @return string One of &#039;post&#039;, &#039;comment&#039;, &#039;term&#039;, &#039;user&#039;, 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 &#039;&#039;;
	}

	/**
	 * 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, &#039;comment&#039;, or `user`.
	 */
	abstract protected function get_rest_field_type();

	/**
	 * Registers the meta field.
	 *
	 * @since 4.7.0
	 * @deprecated 5.6.0
	 *
	 * @see register_rest_field()
	 */
	public function register_field() {
		_deprecated_function( __METHOD__, &#039;5.6.0&#039; );

		register_rest_field(
			$this-&gt;get_rest_field_type(),
			&#039;meta&#039;,
			array(
				&#039;get_callback&#039;    =&gt; array( $this, &#039;get_value&#039; ),
				&#039;update_callback&#039; =&gt; array( $this, &#039;update_value&#039; ),
				&#039;schema&#039;          =&gt; $this-&gt;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 array Array containing the meta values keyed by name.
	 */
	public function get_value( $object_id, $request ) {
		$fields   = $this-&gt;get_registered_fields();
		$response = array();

		foreach ( $fields as $meta_key =&gt; $args ) {
			$name       = $args[&#039;name&#039;];
			$all_values = get_metadata( $this-&gt;get_meta_type(), $object_id, $meta_key, false );

			if ( $args[&#039;single&#039;] ) {
				if ( empty( $all_values ) ) {
					$value = $args[&#039;schema&#039;][&#039;default&#039;];
				} else {
					$value = $all_values[0];
				}

				$value = $this-&gt;prepare_value_for_response( $value, $request, $args );
			} else {
				$value = array();

				if ( is_array( $all_values ) ) {
					foreach ( $all_values as $row ) {
						$value[] = $this-&gt;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[&#039;prepare_callback&#039;] ) ) {
			$value = call_user_func( $args[&#039;prepare_callback&#039;], $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 null|WP_Error Null on success, WP_Error object on failure.
	 */
	public function update_value( $meta, $object_id ) {
		$fields = $this-&gt;get_registered_fields();
		$error  = new WP_Error();

		foreach ( $fields as $meta_key =&gt; $args ) {
			$name = $args[&#039;name&#039;];
			if ( ! array_key_exists( $name, $meta ) ) {
				continue;
			}

			$value = $meta[ $name ];

			/*
			 * A null value means reset the field, which is essentially deleting it
			 * from the database and then relying on the default value.
			 *
			 * Non-single meta can also be removed by passing an empty array.
			 */
			if ( is_null( $value ) || ( array() === $value &amp;&amp; ! $args[&#039;single&#039;] ) ) {
				$args = $this-&gt;get_registered_fields()[ $meta_key ];

				if ( $args[&#039;single&#039;] ) {
					$current = get_metadata( $this-&gt;get_meta_type(), $object_id, $meta_key, true );

					if ( is_wp_error( rest_validate_value_from_schema( $current, $args[&#039;schema&#039;] ) ) ) {
						$error-&gt;add(
							&#039;rest_invalid_stored_value&#039;,
							/* translators: %s: Custom field key. */
							sprintf( __( &#039;The %s property has an invalid stored value, and cannot be updated to null.&#039; ), $name ),
							array( &#039;status&#039; =&gt; 500 )
						);
						continue;
					}
				}

				$result = $this-&gt;delete_meta_value( $object_id, $meta_key, $name );
				if ( is_wp_error( $result ) ) {
					$error-&gt;merge_from( $result );
				}
				continue;
			}

			if ( ! $args[&#039;single&#039;] &amp;&amp; is_array( $value ) &amp;&amp; count( array_filter( $value, &#039;is_null&#039; ) ) ) {
				$error-&gt;add(
					&#039;rest_invalid_stored_value&#039;,
					/* translators: %s: Custom field key. */
					sprintf( __( &#039;The %s property has an invalid stored value, and cannot be updated to null.&#039; ), $name ),
					array( &#039;status&#039; =&gt; 500 )
				);
				continue;
			}

			$is_valid = rest_validate_value_from_schema( $value, $args[&#039;schema&#039;], &#039;meta.&#039; . $name );
			if ( is_wp_error( $is_valid ) ) {
				$is_valid-&gt;add_data( array( &#039;status&#039; =&gt; 400 ) );
				$error-&gt;merge_from( $is_valid );
				continue;
			}

			$value = rest_sanitize_value_from_schema( $value, $args[&#039;schema&#039;] );

			if ( $args[&#039;single&#039;] ) {
				$result = $this-&gt;update_meta_value( $object_id, $meta_key, $name, $value );
			} else {
				$result = $this-&gt;update_multi_meta_value( $object_id, $meta_key, $name, $value );
			}

			if ( is_wp_error( $result ) ) {
				$error-&gt;merge_from( $result );
				continue;
			}
		}

		if ( $error-&gt;has_errors() ) {
			return $error;
		}

		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 true|WP_Error True if meta field is deleted, WP_Error otherwise.
	 */
	protected function delete_meta_value( $object_id, $meta_key, $name ) {
		$meta_type = $this-&gt;get_meta_type();

		if ( ! current_user_can( &quot;delete_{$meta_type}_meta&quot;, $object_id, $meta_key ) ) {
			return new WP_Error(
				&#039;rest_cannot_delete&#039;,
				/* translators: %s: Custom field key. */
				sprintf( __( &#039;Sorry, you are not allowed to edit the %s custom field.&#039; ), $name ),
				array(
					&#039;key&#039;    =&gt; $name,
					&#039;status&#039; =&gt; rest_authorization_required_code(),
				)
			);
		}

		if ( null === get_metadata_raw( $meta_type, $object_id, wp_slash( $meta_key ) ) ) {
			return true;
		}

		if ( ! delete_metadata( $meta_type, $object_id, wp_slash( $meta_key ) ) ) {
			return new WP_Error(
				&#039;rest_meta_database_error&#039;,
				__( &#039;Could not delete meta value from database.&#039; ),
				array(
					&#039;key&#039;    =&gt; $name,
					&#039;status&#039; =&gt; 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
	 * @since 6.7.0 Stores values into DB even if provided registered default value.
	 *
	 * @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 true|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-&gt;get_meta_type();

		if ( ! current_user_can( &quot;edit_{$meta_type}_meta&quot;, $object_id, $meta_key ) ) {
			return new WP_Error(
				&#039;rest_cannot_update&#039;,
				/* translators: %s: Custom field key. */
				sprintf( __( &#039;Sorry, you are not allowed to edit the %s custom field.&#039; ), $name ),
				array(
					&#039;key&#039;    =&gt; $name,
					&#039;status&#039; =&gt; rest_authorization_required_code(),
				)
			);
		}

		$current_values = get_metadata_raw( $meta_type, $object_id, $meta_key, false );
		$subtype        = get_object_subtype( $meta_type, $object_id );

		if ( ! is_array( $current_values ) ) {
			$current_values = array();
		}

		$to_remove = $current_values;
		$to_add    = $values;

		foreach ( $to_add as $add_key =&gt; $value ) {
			$remove_keys = array_keys(
				array_filter(
					$current_values,
					function ( $stored_value ) use ( $meta_key, $subtype, $value ) {
						return $this-&gt;is_meta_value_same_as_stored_value( $meta_key, $subtype, $stored_value, $value );
					}
				)
			);

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

			if ( count( $remove_keys ) &gt; 1 ) {
				// To remove, we need to remove first, then add, so don&#039;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. Otherwise,
		 * `delete_metadata` will return false for subsequent calls of the same value.
		 * Use serialization to produce a predictable string that can be used by array_unique.
		 */
		$to_remove = array_map( &#039;maybe_unserialize&#039;, array_unique( array_map( &#039;maybe_serialize&#039;, $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(
					&#039;rest_meta_database_error&#039;,
					/* translators: %s: Custom field key. */
					sprintf( __( &#039;Could not update the meta value of %s in database.&#039; ), $meta_key ),
					array(
						&#039;key&#039;    =&gt; $name,
						&#039;status&#039; =&gt; 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(
					&#039;rest_meta_database_error&#039;,
					/* translators: %s: Custom field key. */
					sprintf( __( &#039;Could not update the meta value of %s in database.&#039; ), $meta_key ),
					array(
						&#039;key&#039;    =&gt; $name,
						&#039;status&#039; =&gt; WP_Http::INTERNAL_SERVER_ERROR,
					)
				);
			}
		}

		return true;
	}

	/**
	 * Updates a meta value for an object.
	 *
	 * @since 4.7.0
	 * @since 6.7.0 Stores values into DB even if provided registered default value.
	 *
	 * @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 true|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-&gt;get_meta_type();

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

		if ( is_array( $old_value ) &amp;&amp; 1 === count( $old_value )
			&amp;&amp; $this-&gt;is_meta_value_same_as_stored_value( $meta_key, $subtype, $old_value[0], $value )
		) {
			return true;
		}

		if ( ! current_user_can( &quot;edit_{$meta_type}_meta&quot;, $object_id, $meta_key ) ) {
			return new WP_Error(
				&#039;rest_cannot_update&#039;,
				/* translators: %s: Custom field key. */
				sprintf( __( &#039;Sorry, you are not allowed to edit the %s custom field.&#039; ), $name ),
				array(
					&#039;key&#039;    =&gt; $name,
					&#039;status&#039; =&gt; rest_authorization_required_code(),
				)
			);
		}

		if ( ! update_metadata( $meta_type, $object_id, wp_slash( $meta_key ), wp_slash( $value ) ) ) {
			return new WP_Error(
				&#039;rest_meta_database_error&#039;,
				/* translators: %s: Custom field key. */
				sprintf( __( &#039;Could not update the meta value of %s in database.&#039; ), $meta_key ),
				array(
					&#039;key&#039;    =&gt; $name,
					&#039;status&#039; =&gt; WP_Http::INTERNAL_SERVER_ERROR,
				)
			);
		}

		return true;
	}

	/**
	 * Checks if the user provided value is equivalent to a stored value for the given meta key.
	 *
	 * @since 5.5.0
	 *
	 * @param string $meta_key     The meta key being checked.
	 * @param string $subtype      The object subtype.
	 * @param mixed  $stored_value The currently stored value retrieved from get_metadata().
	 * @param mixed  $user_value   The value provided by the user.
	 * @return bool
	 */
	protected function is_meta_value_same_as_stored_value( $meta_key, $subtype, $stored_value, $user_value ) {
		$args      = $this-&gt;get_registered_fields()[ $meta_key ];
		$sanitized = sanitize_meta( $meta_key, $user_value, $this-&gt;get_meta_type(), $subtype );

		if ( in_array( $args[&#039;type&#039;], array( &#039;string&#039;, &#039;number&#039;, &#039;integer&#039;, &#039;boolean&#039; ), true ) ) {
			// The return value of get_metadata will always be a string for scalar types.
			$sanitized = (string) $sanitized;
		}

		return $sanitized === $stored_value;
	}

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

		$meta_type    = $this-&gt;get_meta_type();
		$meta_subtype = $this-&gt;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 =&gt; $args ) {
			if ( empty( $args[&#039;show_in_rest&#039;] ) ) {
				continue;
			}

			$rest_args = array();

			if ( is_array( $args[&#039;show_in_rest&#039;] ) ) {
				$rest_args = $args[&#039;show_in_rest&#039;];
			}

			$default_args = array(
				&#039;name&#039;             =&gt; $name,
				&#039;single&#039;           =&gt; $args[&#039;single&#039;],
				&#039;type&#039;             =&gt; ! empty( $args[&#039;type&#039;] ) ? $args[&#039;type&#039;] : null,
				&#039;schema&#039;           =&gt; array(),
				&#039;prepare_callback&#039; =&gt; array( $this, &#039;prepare_value&#039; ),
			);

			$default_schema = array(
				&#039;type&#039;        =&gt; $default_args[&#039;type&#039;],
				&#039;title&#039;       =&gt; empty( $args[&#039;label&#039;] ) ? &#039;&#039; : $args[&#039;label&#039;],
				&#039;description&#039; =&gt; empty( $args[&#039;description&#039;] ) ? &#039;&#039; : $args[&#039;description&#039;],
				&#039;default&#039;     =&gt; $args[&#039;default&#039;] ?? null,
			);

			$rest_args           = array_merge( $default_args, $rest_args );
			$rest_args[&#039;schema&#039;] = array_merge( $default_schema, $rest_args[&#039;schema&#039;] );

			$type = ! empty( $rest_args[&#039;type&#039;] ) ? $rest_args[&#039;type&#039;] : null;
			$type = ! empty( $rest_args[&#039;schema&#039;][&#039;type&#039;] ) ? $rest_args[&#039;schema&#039;][&#039;type&#039;] : $type;

			if ( null === $rest_args[&#039;schema&#039;][&#039;default&#039;] ) {
				$rest_args[&#039;schema&#039;][&#039;default&#039;] = static::get_empty_value_for_type( $type );
			}

			$rest_args[&#039;schema&#039;] = rest_default_additional_properties_to_false( $rest_args[&#039;schema&#039;] );

			if ( ! in_array( $type, array( &#039;string&#039;, &#039;boolean&#039;, &#039;integer&#039;, &#039;number&#039;, &#039;array&#039;, &#039;object&#039; ), true ) ) {
				continue;
			}

			if ( empty( $rest_args[&#039;single&#039;] ) ) {
				$rest_args[&#039;schema&#039;] = array(
					&#039;type&#039;  =&gt; &#039;array&#039;,
					&#039;items&#039; =&gt; $rest_args[&#039;schema&#039;],
				);
			}

			$registered[ $name ] = $rest_args;
		}

		return $registered;
	}

	/**
	 * Retrieves the object&#039;s meta schema, conforming to JSON Schema.
	 *
	 * @since 4.7.0
	 *
	 * @return array Field schema data.
	 */
	public function get_field_schema() {
		$fields = $this-&gt;get_registered_fields();

		$schema = array(
			&#039;description&#039; =&gt; __( &#039;Meta fields.&#039; ),
			&#039;type&#039;        =&gt; &#039;object&#039;,
			&#039;context&#039;     =&gt; array( &#039;view&#039;, &#039;edit&#039; ),
			&#039;properties&#039;  =&gt; array(),
			&#039;arg_options&#039; =&gt; array(
				&#039;sanitize_callback&#039; =&gt; null,
				&#039;validate_callback&#039; =&gt; array( $this, &#039;check_meta_is_array&#039; ),
			),
		);

		foreach ( $fields as $args ) {
			$schema[&#039;properties&#039;][ $args[&#039;name&#039;] ] = $args[&#039;schema&#039;];
		}

		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[&#039;single&#039;] ) {
			$schema = $args[&#039;schema&#039;];
		} else {
			$schema = $args[&#039;schema&#039;][&#039;items&#039;];
		}

		if ( &#039;&#039; === $value &amp;&amp; in_array( $schema[&#039;type&#039;], array( &#039;boolean&#039;, &#039;integer&#039;, &#039;number&#039; ), true ) ) {
			$value = static::get_empty_value_for_type( $schema[&#039;type&#039;] );
		}

		if ( is_wp_error( rest_validate_value_from_schema( $value, $schema ) ) ) {
			return null;
		}

		return rest_sanitize_value_from_schema( $value, $schema );
	}

	/**
	 * Check the &#039;meta&#039; 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__, &#039;5.6.0&#039;, &#039;rest_default_additional_properties_to_false()&#039; );

		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 &#039;string&#039;:
				return &#039;&#039;;
			case &#039;boolean&#039;:
				return false;
			case &#039;integer&#039;:
				return 0;
			case &#039;number&#039;:
				return 0.0;
			case &#039;array&#039;:
			case &#039;object&#039;:
				return array();
			default:
				return null;
		}
	}
}
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