CIMRestService::chatUserList

static function chatUserList($arParams, $n, CRestServer $server)
{
	global $USER;

	$arParams = array_change_key_case($arParams, CASE_UPPER);

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

	$arParams['CHAT_ID'] = intval($arParams['CHAT_ID']);

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

	if (CIMChat::GetGeneralChatId() == $arParams['CHAT_ID'])
	{
		throw new BitrixRestRestException("Action unavailable", "ACCESS_ERROR", CRestServer::STATUS_FORBIDDEN);
	}

	$userId = $USER->GetID();
	if ($server->getMethod() == "imbot.chat.user.list")
	{
		$userId = self::getBotId($arParams, $server);
	}

	$arChat = CIMChat::GetChatData(array(
									   'ID' => $arParams['CHAT_ID'],
									   'USE_CACHE' => 'Y',
									   'USER_ID' => $userId
								   ));

	return isset($arChat['userInChat'][$arParams['CHAT_ID']])? $arChat['userInChat'][$arParams['CHAT_ID']]: Array();
}