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/*
* Copyright 2007 - 2018 ETH Zuerich, CISD and SIS.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ch.systemsx.cisd.hdf5.h5ar;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.lang3.ArrayUtils;
import ch.systemsx.cisd.base.unix.Unix;
import ch.systemsx.cisd.base.unix.Unix.Group;
import ch.systemsx.cisd.base.unix.Unix.Password;
/**
* Cache for group affiliations of the current user.
*
* @author Bernd RInn
*/
class GroupCache
{
private final Password userOrNull;
/** Gid -> Is user member? */
private final Map<Integer, Boolean> gidMap = new HashMap<Integer, Boolean>();
GroupCache()
{
this.userOrNull = Unix.isOperational() ? Unix.tryGetUserByUid(Unix.getUid()) : null;
}
boolean isUserInGroup(int gid)
{
if (userOrNull == null)
{
return false;
}
final Boolean cached = gidMap.get(gid);
if (cached != null)
{
return cached;
}
final Group groupOrNull = Unix.tryGetGroupByGid(gid);
if (groupOrNull != null)
{
final int idx =
ArrayUtils.indexOf(groupOrNull.getGroupMembers(), userOrNull.getUserName());
final Boolean found =
idx != ArrayUtils.INDEX_NOT_FOUND ? Boolean.TRUE : Boolean.FALSE;
gidMap.put(gid, found);
return found;
} else
{
gidMap.put(gid, Boolean.FALSE);
return false;
}
}
}
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