CheckAvatarId.php

<?php
 
namespace Bitrix\Im\V2\Controller\Filter;
 
use Bitrix\Disk\Driver;
use Bitrix\Disk\File;
use Bitrix\Disk\Security\DiskSecurityContext;
use Bitrix\Im\V2\Chat;
use Bitrix\Main\Engine\ActionFilter\Base;
use Bitrix\Main\Error;
use Bitrix\Main\Event;
use Bitrix\Main\EventResult;
use Bitrix\Main\File\Image;
 
class CheckAvatarId extends Base
{
    public function onBeforeAction(Event $event)
    {
        $avatarId = $this->getAction()->getArguments()['avatarId'];
        $avatarResult = \CFile::GetByID($avatarId);
        $avatar = (isset($avatarResult) && $avatarResult) ? $avatarResult->Fetch() : null;
        $info = (new Image($_SERVER["DOCUMENT_ROOT"] . $avatar['SRC']))->getInfo();
        if (!$info)
        {
            $this->addError(new Error(
                'Wrong file type',
                Chat\ChatError::WRONG_PARAMETER
            ));
            return new EventResult(EventResult::ERROR, null, null, $this);
        }
 
        $currentUser = $this->getAction()->getCurrentUser();
        $userId = isset($currentUser) ? $currentUser->getId() : null;
        $securityContext = new DiskSecurityContext((int)$userId);
        $parameters = [
            'filter' => ['FILE_ID' => $avatarId],
            'with' => ['CREATE_USER']
        ];
        $parameters = Driver::getInstance()->getRightsManager()->addRightsCheck($securityContext, $parameters, ['ID', 'CREATED_BY']);
 
        $fileCollection = File::getModelList($parameters);
        if (!$fileCollection)
        {
            $this->addError(new Error(
                'File is not accessible',
                Chat\ChatError::WRONG_PARAMETER
            ));
            return new EventResult(EventResult::ERROR, null, null, $this);
        }
 
        return null;
    }
}