CEventCalendar::GetPermissions

function GetPermissions($arParams = array())
{
	global $USER;
	$iblockId = isset($arParams['iblockId']) ? $arParams['iblockId'] : $this->iblockId;
	$bOwner = isset($arParams['bOwner']) ? $arParams['bOwner'] : $this->bOwner;
	$ownerId = isset($arParams['ownerId']) ? $arParams['ownerId'] : $this->ownerId;
	$ownerType = isset($arParams['ownerType']) ? $arParams['ownerType'] : $this->ownerType;
	$bCurUser = !isset($arParams['userId']) || $arParams['userId'] == $GLOBALS['USER']->GetID();
	$userId = $bCurUser ? $GLOBALS['USER']->GetID() : intval($arParams['userId']);
	$bCheckSocNet = !isset($arParams['bCheckSocNet']) || $arParams['bCheckSocNet'] !== false;

	if ($bCurUser)
	{
		$maxPerm = CIBlock::GetPermission($iblockId);
	}
	else
	{
		$arGroups = CUser::GetUserGroup($userId);
		$arGroupPerm = CIBlock::GetGroupPermissions($iblockId);
		$maxPerm = 'D';
		foreach($arGroupPerm as $k => $perm)
			if (in_array($k, $arGroups) && $perm > $maxPerm)
				$maxPerm = $perm;
	}
	$bAccess = $maxPerm >= 'R';
	$bCurUserOwner = $ownerType != 'USER' || $this->ownerId == $userId;
	$bReadOnly = $bAccess && $maxPerm < 'W';

	// $maxPerm :
	// 	D - denied
	//	R - check SocNet permissions (if it's socnet)
	//	>W - turn on GOD-mode

	/* modified by wladart */
	// to re-calc readonly even if it's not readonly by iblock settings, for all users
	//if ($bCheckSocNet && class_exists('CSocNetFeatures'))
	if ($bCheckSocNet && $bOwner && class_exists('CSocNetFeatures')) // Check permissions for SocNet
	{
		$SONET_ENT = $ownerType == 'USER' ? SONET_ENTITY_USER : SONET_ENTITY_GROUP;
		if (!CSocNetFeatures::IsActiveFeature($SONET_ENT, $ownerId, "calendar"))
		{
			$bAccess = false;
			$bReadOnly = true;
		}
		else
		{
			$bAccess = CSocNetFeaturesPerms::CanPerformOperation($userId, $SONET_ENT, $ownerId, "calendar", 'view');
			$bReadOnly = !CSocNetFeaturesPerms::CanPerformOperation($userId, $SONET_ENT, $ownerId, "calendar", 'write');
		}
	}

	if (!$bCurUserOwner)
		$bReadOnly = true;

	if ($arParams['setProperties'] !== false)
	{
		$this->bAccess = $bAccess;
		$this->bReadOnly = $bReadOnly;
		$this->bCurUser = $bCurUser;
		$this->userId = $userId;
		$this->userName = $USER->IsAuthorized() ? $USER->GetFirstName()." ".$USER->GetLastName() : 'Unknown user';
		$this->bCurUserOwner = $bCurUserOwner;
	}

	return array('bAccess' => $bAccess, 'bReadOnly' => $bReadOnly);
}