syncingattachments.php

См. документацию.

<?php
 
namespace Bitrix\Mail\Controller;
 
use Bitrix\Mail\Helper\MessageAccess;
use Bitrix\Mail\Helper\AttachmentHelper;
use Bitrix\Main\Engine\Controller;
use Bitrix\Main\Loader;
 
class SyncingAttachments extends Controller
{
    public function resyncAttachmentsAction(int $messageId, int $mailboxId): bool
    {
        $currentUserId = $this->getCurrentUser()?->getId();
 
        if (is_null($currentUserId) || !Loader::includeModule('mail') || is_null($currentUserId))
        {
            return false;
        }
 
        if(!MessageAccess::isMailboxOwner($mailboxId, $currentUserId))
        {
            return false;
        }
 
        $messageAttachments = new AttachmentHelper($mailboxId, $messageId);
 
        return $messageAttachments->update();
    }
}