wp_back/wp-content/themes/generatepress/inc/class-rest.php

<?php
/**
 * Rest API functions
 *
 * @package GenerateBlocks
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Class GenerateBlocks_Rest
 */
class GeneratePress_Rest extends WP_REST_Controller {
	/**
	 * Instance.
	 *
	 * @access private
	 * @var object Instance
	 */
	private static $instance;

	/**
	 * Namespace.
	 *
	 * @var string
	 */
	protected $namespace = 'generatepress/v';

	/**
	 * Version.
	 *
	 * @var string
	 */
	protected $version = '1';

	/**
	 * Initiator.
	 *
	 * @return object initialized object of class.
	 */
	public static function get_instance() {
		if ( ! isset( self::$instance ) ) {
			self::$instance = new self();
		}

		return self::$instance;
	}

	/**
	 * GeneratePress_Rest constructor.
	 */
	public function __construct() {
		add_action( 'rest_api_init', array( $this, 'register_routes' ) );
	}

	/**
	 * Register rest routes.
	 */
	public function register_routes() {
		$namespace = $this->namespace . $this->version;

		register_rest_route(
			$namespace,
			'/reset/',
			array(
				'methods'             => WP_REST_Server::EDITABLE,
				'callback'            => array( $this, 'reset' ),
				'permission_callback' => array( $this, 'update_settings_permission' ),
			)
		);
	}

	/**
	 * Get edit options permissions.
	 *
	 * @return bool
	 */
	public function update_settings_permission() {
		return current_user_can( 'manage_options' );
	}

	/**
	 * Reset settings.
	 *
	 * @param WP_REST_Request $request request object.
	 *
	 * @return mixed
	 */
	public function reset( WP_REST_Request $request ) {
		delete_option( 'generate_settings' );
		delete_option( 'generate_dynamic_css_output' );
		delete_option( 'generate_dynamic_css_cached_version' );

		return $this->success( __( 'Settings reset.', 'generatepress' ) );
	}

	/**
	 * Success rest.
	 *
	 * @param mixed $response response data.
	 * @return mixed
	 */
	public function success( $response ) {
		return new WP_REST_Response(
			array(
				'success'  => true,
				'response' => $response,
			),
			200
		);
	}

	/**
	 * Failed rest.
	 *
	 * @param mixed $response response data.
	 * @return mixed
	 */
	public function failed( $response ) {
		return new WP_REST_Response(
			array(
				'success'  => false,
				'response' => $response,
			),
			200
		);
	}

	/**
	 * Error rest.
	 *
	 * @param mixed $code     error code.
	 * @param mixed $response response data.
	 * @return mixed
	 */
	public function error( $code, $response ) {
		return new WP_REST_Response(
			array(
				'error'      => true,
				'success'    => false,
				'error_code' => $code,
				'response'   => $response,
			),
			401
		);
	}
}

GeneratePress_Rest::get_instance();