diskfolderaccesscheck.php

<?php
 
namespace Bitrix\Im\Controller\Call\Filter;
 
use Bitrix\Main\Error;
use Bitrix\Main\Event;
use Bitrix\Main\Engine\ActionFilter\Base;
use Bitrix\Main\EventResult;
 
class DiskFolderAccessCheck extends Base
{
    public function onBeforeAction(Event $event)
    {
        $chatId = $this->action->getController()->getRequest()->getHeader('Call-Chat-Id');
        if (!$chatId)
        {
            $this->addError(new Error("Header Call-Chat-Id can't be empty"));
 
            return new EventResult(EventResult::ERROR, null, null, $this);
        }
 
        if (!\Bitrix\Im\Chat::hasAccess($chatId))
        {
            $this->addError(new Error("You don't have access to this chat"));
 
            return new EventResult(EventResult::ERROR, null, null, $this);
        }
 
        return null;
    }
}