Sindbad~EG File Manager

<?php
/**
 * Base for creating internal API
 *
 * @author  : Chatway
 * @license : GPLv3
 * */

namespace Chatway\App;

defined( 'ABSPATH' ) || exit;

abstract class Api
{
    /**
     * @var string
     */
    public $prefix = '';

    /**
     * @var string
     */
    public $param = '';

    /**
     * @var \WP_REST_Request
     */
    public $request;

    abstract public function config();

    public function __construct() {
        $this->config();
        $this->init();
    }

    public function init() {
        add_action(
            'rest_api_init', function () {
                register_rest_route(
                    untrailingslashit( 'chatway/v1/' . $this->prefix ), '/(?P<action>\w+)/' . ltrim( $this->param, '/' ), [
                        'methods'             => \WP_REST_Server::ALLMETHODS,
                        'callback'            => [$this, 'action'],
                        'permission_callback' => function () {
                            return current_user_can( 'manage_options' );
                        }
                    ] 
                );
            } 
        );
    }

    /**
     * @param $request
     * @return mixed
     */
    public function action( \WP_REST_Request $request ) {
        $this->request = $request;
        $action_class  = strtolower( $this->request->get_method() ) . '_' . sanitize_key( $this->request['action'] );
        if ( method_exists( $this, $action_class ) ) {
            return $this->{$action_class}();
        }
    }
}