CIBlockDocumentWebdav::GetAllowableUserGroups

static function GetAllowableUserGroups($documentType, $withExtended = false)
{
	if($storage = self::needProxyToDiskByDocType($documentType))
	{
		return self::proxyToDisk(__FUNCTION__, array(BitrixDiskBizProcDocumentCompatible::generateDocumentType($storage->getId())));
	}

	$iblockId = intval(mb_substr($documentType, mb_strlen("iblock_")));
	if ($iblockId <= 0)
		throw new CBPArgumentOutOfRangeException("documentType", $documentType);

	$documentType = trim($documentType);
	if ($documentType == '')
		return false;

	$iblockId = intval(mb_substr($documentType, mb_strlen("iblock_")));

	$arResult = array("Author" => GetMessage("IBD_DOCUMENT_AUTHOR"));

	$arRes = array(1);

	if(CIBlock::GetArrayByID($iblockId, "RIGHTS_MODE") === "E")
	{
		$obRights = new CIBlockRights($iblockId);
		foreach($obRights->GetGroups("element_bizproc_start") as $GROUP_CODE)
			if(preg_match("/^G(\d+)$/", $GROUP_CODE, $match))
				$arRes[] = $match[1];
	}
	else
	{
		$arGroups = CIBlock::GetGroupPermissions($iblockId);
		foreach ($arGroups as $groupId => $perm)
		{
			if ($perm >= "R")
				$arRes[] = $groupId;
		}
	}

	//Crutch for Bitrix24 context (user group management is not suppotted)
	if(IsModuleInstalled('bitrix24'))
	{
		$siteID = CAllSite::GetDefSite();
		$dbResult = CGroup::GetList(
			'',
			'',
			array('STRING_ID' => 'EMPLOYEES_'.$siteID,
			'STRING_ID_EXACT_MATCH' => 'Y')
		);
		if($arEmployeeGroup = $dbResult->Fetch())
		{
			$employeeGroupID = intval($arEmployeeGroup['ID']);
			if(!in_array($employeeGroupID, $arRes, true))
			{
				$arRes[] = $employeeGroupID;
			}
		}
	}


	$dbGroupsList = CGroup::GetListEx(array("NAME" => "ASC"), array("ID" => $arRes));
	while ($arGroup = $dbGroupsList->Fetch())
		$arResult[$arGroup["ID"]] = $arGroup["NAME"];

	return $arResult;
}