CIMRestService::dialogWriting

static function dialogWriting($arParams, $n, CRestServer $server)
{
	$arParams = array_change_key_case($arParams, CASE_UPPER);

	if (isset($arParams['DIALOG_ID']))
	{
		if (!BitrixImCommon::isDialogId($arParams['DIALOG_ID']))
		{
			throw new BitrixRestRestException("Dialog ID can't be empty", "DIALOG_ID_EMPTY", CRestServer::STATUS_WRONG_REQUEST);
		}
	}
	else if (isset($arParams['CHAT_ID']))
	{
		$arParams['CHAT_ID'] = intval($arParams['CHAT_ID']);

		if ($arParams['CHAT_ID'] <= 0)
		{
			throw new BitrixRestRestException("Chat ID can't be empty", "CHAT_ID_EMPTY", CRestServer::STATUS_WRONG_REQUEST);
		}

		$arParams['DIALOG_ID'] = 'chat'.$arParams['CHAT_ID'];
	}

	$result = CIMMessenger::StartWriting($arParams['DIALOG_ID']);
	if (!$result)
	{
		throw new BitrixRestRestException("Action unavailable", "ACCESS_ERROR", CRestServer::STATUS_FORBIDDEN);
	}

	return true;
}