CheckMessageSend.php

<?php
 
namespace Bitrix\Im\V2\Controller\Filter;
 
use Bitrix\Im\V2\Chat;
use Bitrix\Im\V2\Chat\ChatError;
use Bitrix\Im\V2\Chat\PrivateChat;
use Bitrix\Im\V2\Message\Delete\DisappearService;
use Bitrix\Im\V2\Message\MessageError;
use Bitrix\Main\Engine\ActionFilter\Base;
use Bitrix\Main\Engine\Response\Converter;
use Bitrix\Main\Event;
use Bitrix\Main\EventResult;
use CIMChat;
 
class CheckMessageSend extends Base
{
    public function onBeforeAction(Event $event)
    {
        $arguments = $this->getAction()->getArguments();
        $chat = $arguments['chat'];
 
        if (!$chat instanceof Chat)
        {
            $this->addError(new ChatError(ChatError::NOT_FOUND, 'Chat not found'));
 
            return new EventResult(EventResult::ERROR, null, null, $this);
        }
 
        $result = $this->canPost($chat);
        if (!$result)
        {
            $this->addError(new ChatError(ChatError::ACCESS_DENIED, 'Access denied'));
 
            return new EventResult(EventResult::ERROR, null, null, $this);
        }
 
        if (!$chat->checkAllowedAction('SEND'))
        {
            $this->addError(new ChatError(
                ChatError::ACCESS_DENIED,
                'It is forbidden to send messages to this chat'
            ));
 
            return new EventResult(EventResult::ERROR, null, null, $this);
        }
 
        return null;
    }
 
    private function canPost(Chat $chat): bool
    {
        if ($chat instanceof PrivateChat)
        {
            return true;
        }
 
        $userRole = $chat->getRole();
        $chatRole = $chat->getCanPost();
 
        return Chat\Permission::compareRole($userRole, $chatRole);
    }
}