Chat::onAddChatUser

static function onAddChatUser(array $eventArgs)
{
	$observersRestriction = Crm\Restriction\RestrictionManager::getObserversRestriction();
	if (!$observersRestriction->hasPermission())
	{
		return;
	}
	$chatID = isset($eventArgs['CHAT_ID']) ? (int)$eventArgs['CHAT_ID'] : 0;
	if($chatID <= 0)
	{
		return;
	}

	$userIDs = isset($eventArgs['NEW_USERS']) && is_array($eventArgs['NEW_USERS']) ? $eventArgs['NEW_USERS'] : [];
	Main\Type\Collection::normalizeArrayValuesByInt($userIDs);
	if(empty($userIDs))
	{
		return;
	}

	$chatData = Im\Model\ChatTable::getList(
		[ 'select' => [ 'ID', 'ENTITY_TYPE', 'ENTITY_ID' ], 'filter' => [ '=ID' => $chatID ] ]
	)->fetch();
	if(!is_array($chatData))
	{
		return;
	}

	if(!(isset($chatData['ENTITY_TYPE']) && $chatData['ENTITY_TYPE'] === self::CHAT_ENTITY_TYPE))
	{
		return;
	}

	$entityInfo = Crm\Integration\Im\Chat::resolveEntityInfo(
		isset($chatData['ENTITY_ID']) ? $chatData['ENTITY_ID'] : ''
	);

	if(!is_array($entityInfo))
	{
		return;
	}

	if($entityInfo['ENTITY_TYPE_ID'] === \CCrmOwnerType::Deal)
	{
		\CCrmDeal::AddObserverIDs($entityInfo['ENTITY_ID'], $userIDs);
	}
	elseif($entityInfo['ENTITY_TYPE_ID'] === \CCrmOwnerType::Lead)
	{
		\CCrmLead::AddObserverIDs($entityInfo['ENTITY_ID'], $userIDs);
	}
	else
	{
		$factory = Container::getInstance()->getFactory((int)$entityInfo['ENTITY_TYPE_ID']);
		if ($factory && $factory->isObserversEnabled())
		{
			$item = $factory->getItem((int)$entityInfo['ENTITY_ID']);
			if ($item)
			{
				$currentObservers = $item->getObservers();
				$currentAndNewObservers = array_merge($currentObservers, $userIDs);
				$item->setObservers($currentAndNewObservers);

				$factory->getUpdateOperation($item)
					->disableCheckAccess()
					->launch()
				;
			}
		}
	}
}