class-block-editor.php

<?php
/**
 * Support block editor (Gutenberg).
 *
 * @package WP_Revisions_Control
 */

namespace WP_Revisions_Control;

use WP_REST_Response;
use WP_REST_Request;
use WP_Revisions_Control;

/**
 * Class Block_Editor.
 */
class Block_Editor {
	use Singleton;

	/**
	 * Name of action used to clean up post's revisions via cron.
	 *
	 * @var string
	 */
	private $cron_action = 'wp_revisions_control_cron_purge';

	/**
	 * Prepare class.
	 *
	 * This is called at `init`, so cannot use that hook unless priority is
	 * greater than 10.
	 */
	private function setup() {
		add_action( 'rest_api_init', array( $this, 'action_rest_api_init' ) );
		add_filter( 'is_protected_meta', array( $this, 'filter_is_protected_meta' ), 10, 2 );
		add_action( $this->cron_action, array( WP_Revisions_Control::get_instance(), 'do_purge_excess' ), 10, 2 );
		add_action( 'enqueue_block_editor_assets', array( $this, 'action_enqueue_block_editor_assets' ) );
	}

	/**
	 * Register REST API components for Gutenberg UI.
	 */
	public function action_rest_api_init() {
		if ( ! function_exists( 'register_rest_route' ) ) {
			return;
		}

		foreach ( array_keys( WP_Revisions_Control::get_instance()->get_post_types() ) as $post_type ) {
			register_meta(
				'post',
				WP_REVISIONS_CONTROL_LIMIT_META_KEY,
				array(
					'object_subtype' => $post_type,
					'type'           => 'string', // Can be empty, so must be string.
					'default'        => '',
					'single'         => true,
					'show_in_rest'   => true,
					'description'    => __(
						'Number of revisions to retain.',
						'wp_revisions_control'
					),
				)
			);
		}

		register_rest_route(
			'wp-revisions-control/v1',
			'schedule/(?P<id>[\d]+)/(?P<limit_override>[\d]+)',
			array(
				'methods'             => 'PUT',