LdapGroupDAO.java

/*
 ************************************************************************
 *******************  CANADIAN ASTRONOMY DATA CENTRE  *******************
 **************  CENTRE CANADIEN DE DONNÉES ASTRONOMIQUES  **************
 *
 *  (c) 2014.                            (c) 2014.
 *  Government of Canada                 Gouvernement du Canada
 *  National Research Council            Conseil national de recherches
 *  Ottawa, Canada, K1A 0R6              Ottawa, Canada, K1A 0R6
 *  All rights reserved                  Tous droits réservés
 *
 *  NRC disclaims any warranties,        Le CNRC dénie toute garantie
 *  expressed, implied, or               énoncée, implicite ou légale,
 *  statutory, of any kind with          de quelque nature que ce
 *  respect to the software,             soit, concernant le logiciel,
 *  including without limitation         y compris sans restriction
 *  any warranty of merchantability      toute garantie de valeur
 *  or fitness for a particular          marchande ou de pertinence
 *  purpose. NRC shall not be            pour un usage particulier.
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 *  damages, whether direct or           être tenu responsable de tout
 *  indirect, special or general,        dommage, direct ou indirect,
 *  consequential or incidental,         particulier ou général,
 *  arising from the use of the          accessoire ou fortuit, résultant
 *  software.  Neither the name          de l'utilisation du logiciel. Ni
 *  of the National Research             le nom du Conseil National de
 *  Council of Canada nor the            Recherches du Canada ni les noms
 *  names of its contributors may        de ses  participants ne peuvent
 *  be used to endorse or promote        être utilisés pour approuver ou
 *  products derived from this           promouvoir les produits dérivés
 *  software without specific prior      de ce logiciel sans autorisation
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 *  This file is part of the             Ce fichier fait partie du projet
 *  OpenCADC project.                    OpenCADC.
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 *  OpenCADC is free software:           OpenCADC est un logiciel libre ;
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 *  modify it under the terms of         modifier suivant les termes de
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 *  <http://www.gnu.org/licenses/>.      pas le cas, consultez :
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 *  $Revision: 4 $
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 ************************************************************************
 */
package ca.nrc.cadc.ac.server.ldap;

import java.security.AccessControlException;
import java.security.Principal;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.security.auth.x500.X500Principal;

import org.apache.log4j.Logger;

import ca.nrc.cadc.ac.ActivatedGroup;
import ca.nrc.cadc.ac.Group;
import ca.nrc.cadc.ac.GroupAlreadyExistsException;
import ca.nrc.cadc.ac.GroupNotFoundException;
import ca.nrc.cadc.ac.Role;
import ca.nrc.cadc.ac.User;
import ca.nrc.cadc.ac.UserNotFoundException;
import ca.nrc.cadc.net.TransientException;
import ca.nrc.cadc.util.StringUtil;

import com.unboundid.ldap.sdk.AddRequest;
import com.unboundid.ldap.sdk.Attribute;
import com.unboundid.ldap.sdk.DN;
import com.unboundid.ldap.sdk.Filter;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.ldap.sdk.LDAPResult;
import com.unboundid.ldap.sdk.LDAPSearchException;
import com.unboundid.ldap.sdk.Modification;
import com.unboundid.ldap.sdk.ModificationType;
import com.unboundid.ldap.sdk.ModifyRequest;
import com.unboundid.ldap.sdk.ResultCode;
import com.unboundid.ldap.sdk.SearchRequest;
import com.unboundid.ldap.sdk.SearchResult;
import com.unboundid.ldap.sdk.SearchResultEntry;
import com.unboundid.ldap.sdk.SearchScope;
import com.unboundid.ldap.sdk.controls.ProxiedAuthorizationV2RequestControl;
import javax.naming.ldap.Rdn;

public class LdapGroupDAO<T extends Principal> extends LdapDAO
{
    private static final Logger logger = Logger.getLogger(LdapGroupDAO.class);
    
    private static String[] GROUP_ATTRS = new String[] 
    { 
        "entrydn", "cn", "nsaccountlock", "owner", "modifytimestamp", "description"
    };
    private static String[] GROUP_AND_MEMBER_ATTRS = new String[] 
    { 
        "entrydn", "cn", "nsaccountlock", "owner", "modifytimestamp", "description", "uniquemember"
    };
    
    private LdapUserDAO<T> userPersist;

    public LdapGroupDAO(LdapConfig config, LdapUserDAO<T> userPersist)
    {
        super(config);
        if (userPersist == null)
        {
            throw new IllegalArgumentException(
                    "User persistence instance required");
        }
        this.userPersist = userPersist;
    }

    /**
     * Persists a group.
     * 
     * @param group The group to create
     * 
     * @return created group
     * 
     * @throws GroupAlreadyExistsException If a group with the same ID already 
     *                                     exists.
     * @throws TransientException If an temporary, unexpected problem occurred.
     * @throws UserNotFoundException If owner or a member not valid user.
     * @throws GroupNotFoundException 
     */
    public Group addGroup(final Group group)
        throws GroupAlreadyExistsException, TransientException,
               UserNotFoundException, AccessControlException, 
               GroupNotFoundException
    {
        if (group.getOwner() == null)
        {
            throw new IllegalArgumentException("Group owner must be specified");
        }
        
        if (!group.getProperties().isEmpty())
        {
            throw new UnsupportedOperationException(
                    "Support for groups properties not available");
        }
        
        if (!isCreatorOwner(group.getOwner()))
        {
            throw new AccessControlException("Group owner must be creator");
        }

        try
        {
            Group newGroup = reactivateGroup(group);
            if ( newGroup != null)
            {
                return newGroup;
            }
            else
            {
                
                DN ownerDN = userPersist.getUserDN(group.getOwner());
                
                // add group to groups tree
                LDAPResult result = addGroup(getGroupDN(group.getID()), 
                                             group.getID(), ownerDN, 
                                             group.description, 
                                             group.getUserMembers(), 
                                             group.getGroupMembers());
                LdapDAO.checkLdapResult(result.getResultCode());
                
                // add group to admin groups tree
                result = addGroup(getAdminGroupDN(group.getID()), 
                                  group.getID(), ownerDN, 
                                  group.description, 
                                  group.getUserAdmins(), 
                                  group.getGroupAdmins());
                LdapDAO.checkLdapResult(result.getResultCode());
                // AD: Search results sometimes come incomplete if
                // connection is not reset - not sure why.
                getConnection().reconnect();
                try
                {
                    return getGroup(group.getID());
                }
                catch (GroupNotFoundException e)
                {
                    throw new RuntimeException("BUG: new group not found");
                }
            }
        }
        catch (LDAPException e)
        {
        	logger.debug("addGroup Exception: " + e, e);
            LdapDAO.checkLdapResult(e.getResultCode());
            throw new RuntimeException("Unexpected LDAP exception", e);
        } 
    }
    
    private LDAPResult addGroup(final DN groupDN, final String groupID,
                                final DN ownerDN, final String description, 
                                final Set<User<? extends Principal>> users, 
                                final Set<Group> groups)
        throws UserNotFoundException, LDAPException, TransientException, 
        AccessControlException, GroupNotFoundException
    {
        // add new group
        List<Attribute> attributes = new ArrayList<Attribute>();
        Attribute ownerAttribute = 
                        new Attribute("owner", ownerDN.toNormalizedString());
        attributes.add(ownerAttribute);
        attributes.add(new Attribute("objectClass", "groupofuniquenames"));
        attributes.add(new Attribute("cn", groupID));
        
        if (StringUtil.hasText(description))
        {
            attributes.add(new Attribute("description", description));
        }

        List<String> members = new ArrayList<String>();
        for (User<? extends Principal> userMember : users)
        {
            DN memberDN = this.userPersist.getUserDN(userMember);
            members.add(memberDN.toNormalizedString());
        }
        for (Group groupMember : groups)
        {
            final String groupMemberID = groupMember.getID();
            if (!checkGroupExists(groupMemberID))
            {
                throw new GroupNotFoundException(groupMemberID);
            }
            DN memberDN = getGroupDN(groupMemberID);
            members.add(memberDN.toNormalizedString());
        }
        if (!members.isEmpty())
        {
            attributes.add(new Attribute("uniquemember", 
                (String[]) members.toArray(new String[members.size()])));
        }

        AddRequest addRequest = new AddRequest(groupDN, attributes);
        addRequest.addControl(
                new ProxiedAuthorizationV2RequestControl(
                        "dn:" + getSubjectDN().toNormalizedString()));

        logger.debug("addGroup: " + groupDN);
        return getConnection().add(addRequest);
    }
    
    
    /**
     * Checks whether group name available for the user or already in use.
     * @param group
     * @return activated group or null if group does not exists
     * @throws AccessControlException
     * @throws UserNotFoundException
     * @throws GroupNotFoundException
     * @throws TransientException
     * @throws GroupAlreadyExistsException 
     */
    private Group reactivateGroup(final Group group)
        throws AccessControlException, UserNotFoundException,
        TransientException, GroupAlreadyExistsException
    {
        try
        {
            // check group name exists           
            Filter filter = Filter.createEqualityFilter("cn", group.getID());

            DN groupDN = getGroupDN(group.getID());
            SearchRequest searchRequest = 
                    new SearchRequest(groupDN.toNormalizedString(), SearchScope.BASE, filter, 
                                      new String[] {"nsaccountlock"});

            searchRequest.addControl(
                    new ProxiedAuthorizationV2RequestControl("dn:" + 
                            getSubjectDN().toNormalizedString()));

            SearchResultEntry searchResult = getConnection().searchForEntry(searchRequest);
            
            if (searchResult == null)
            {
                return null;
            }

            if (searchResult.getAttributeValue("nsaccountlock") == null)
            {
                throw new GroupAlreadyExistsException("Group already exists " + group.getID());
            }
            
            // activate group            
            try
            {
                return modifyGroup(null, group, true);
            } 
            catch (GroupNotFoundException e)
            {
                throw new RuntimeException(
                        "BUG: group to modify does not exist" + group.getID());
            }          
        } 
        catch (LDAPException e)
        {
        	logger.debug("reactivateGroup Exception: " + e, e);
            LdapDAO.checkLdapResult(e.getResultCode());
            throw new RuntimeException("Unexpected LDAP exception", e);
        }
    }
    
    
    /**
     * Get all group names.
     * 
     * @return A collection of strings
     * 
     * @throws TransientException If an temporary, unexpected problem occurred.
     */
    public Collection<String> getGroupNames()
        throws TransientException
    {
        try
        {
            Filter filter = Filter.createPresenceFilter("cn");
            String [] attributes = new String[] {"cn", "nsaccountlock"};
            
            SearchRequest searchRequest = 
                    new SearchRequest(config.getGroupsDN(), 
                                      SearchScope.SUB, filter, attributes);
    
            SearchResult searchResult = null;
            try
            {
                searchResult = getConnection().search(searchRequest);
            }
            catch (LDAPSearchException e)
            {
                logger.debug("Could not find groups root", e);
                LdapDAO.checkLdapResult(e.getResultCode());
                if (e.getResultCode() == ResultCode.NO_SUCH_OBJECT)
                {
                    throw new IllegalStateException("Could not find groups root");
                }
                
                throw new IllegalStateException("unexpected failure", e);
            }
            
            LdapDAO.checkLdapResult(searchResult.getResultCode());
            List<String> groupNames = new ArrayList<String>();
            for (SearchResultEntry next : searchResult.getSearchEntries())
            {
                if (!next.hasAttribute("nsaccountlock"))
                {
                    groupNames.add(next.getAttributeValue("cn"));
                }
            }
            
            return groupNames;
        }
        catch (LDAPException e1)
        {
            logger.debug("getGroupNames Exception: " + e1, e1);
            LdapDAO.checkLdapResult(e1.getResultCode());
            throw new IllegalStateException("Unexpected exception: " + e1.getMatchedDN(), e1);
        }
        
    }

    /**
     * Get the group with members.
     * 
     * @param groupID The Group unique ID.
     * 
     * @return A Group instance
     * 
     * @throws GroupNotFoundException If the group was not found.
     * @throws TransientException  If an temporary, unexpected problem occurred.
     */
    public Group getGroup(final String groupID)
        throws GroupNotFoundException, TransientException,
               AccessControlException
    {
        return getGroup(groupID, true);
    }
    
    private Group getGroup(final String groupID, final boolean withMembers)
        throws GroupNotFoundException, TransientException,
               AccessControlException
    {
        Group group = getGroup(getGroupDN(groupID), groupID, withMembers);
        
        Group adminGroup = getGroup(getAdminGroupDN(groupID), null, true);
        
        group.getGroupAdmins().addAll(adminGroup.getGroupMembers());
        group.getUserAdmins().addAll(adminGroup.getUserMembers());
        return group;
    }
    
    // groupID is here so eceptions and loggiong have plain groupID instead of DN
    private Group getGroup(final DN groupDN, final String xgroupID, final boolean withMembers)
        throws GroupNotFoundException, TransientException, 
               AccessControlException
    {
        logger.debug("getGroup: " + groupDN + " members: " + withMembers);
        String loggableGroupID = xgroupID;
        if (loggableGroupID == null)
            loggableGroupID = groupDN.toString(); // member or admin group: same name, internal tree
        
        String[] attributes = GROUP_ATTRS;
        if (withMembers)
            attributes = GROUP_AND_MEMBER_ATTRS;
        try
        {
            Filter filter = Filter.createNOTFilter(Filter.createPresenceFilter("nsaccountlock"));
            
            SearchRequest searchRequest = 
                    new SearchRequest(groupDN.toNormalizedString(), 
                                      SearchScope.BASE, filter, attributes);

            searchRequest.addControl(
                    new ProxiedAuthorizationV2RequestControl("dn:" + 
                            getSubjectDN().toNormalizedString()));

            
            SearchResultEntry searchEntry = getConnection().searchForEntry(searchRequest);
            
            if (searchEntry == null)
            {
                String msg = "Group not found " + loggableGroupID;
                logger.debug(msg + " cause: null");
                throw new GroupNotFoundException(loggableGroupID);
            }
            
            Group ldapGroup = createGroupFromEntry(searchEntry);
            
            if (searchEntry.getAttributeValues("uniquemember") != null)
            {
                for (String member : searchEntry.getAttributeValues("uniquemember"))
                {
                    DN memberDN = new DN(member);
                    if (memberDN.isDescendantOf(config.getUsersDN(), false))
                    {
                        User<X500Principal> user;
                        try
                        {
                            user = userPersist.getMember(memberDN);
                            ldapGroup.getUserMembers().add(user);
                        }
                        catch (UserNotFoundException e)
                        {
                            // ignore as we do not cleanup deleted users
                            // from groups they belong to
                        }
                    }
                    else if (memberDN.isDescendantOf(config.getGroupsDN(), false))
                    {
                        try
                        {
                            ldapGroup.getGroupMembers().add(getGroup(memberDN, null, false));
                        }
                        catch(GroupNotFoundException e)
                        {
                            // ignore as we are not cleaning up
                            // deleted groups from the group members
                        }
                    }
                    else
                    {
                        throw new RuntimeException(
                            "BUG: unknown member DN type: " + memberDN);
                    }
                }
            }
            
            return ldapGroup;
        }
        catch (LDAPException e1)
        {
            logger.debug("getGroup Exception: " + e1, e1);
            LdapDAO.checkLdapResult(e1.getResultCode());
            throw new RuntimeException("BUG: checkLdapResult didn't throw an exception");
        }
    }

    /**
     * Modify the given group.
     *
     * @param group The group to update. It must be an existing group
     * 
     * @return The newly updated group.
     * 
     * @throws GroupNotFoundException If the group was not found.
     * @throws TransientException If an temporary, unexpected problem occurred.
     * @throws AccessControlException If the operation is not permitted.
     * @throws UserNotFoundException If owner or group members not valid users.
     */
    public Group modifyGroup(final Group group)
        throws GroupNotFoundException, TransientException,
               AccessControlException, UserNotFoundException
    {
        Group existing = getGroup(group.getID()); //group must exists first
        return modifyGroup(existing, group, false); 
    }
    
    private Group modifyGroup(final Group existing, final Group group, boolean withActivate)
        throws UserNotFoundException, TransientException,
               AccessControlException, GroupNotFoundException
    {
        if (!group.getProperties().isEmpty())
        {
            throw new UnsupportedOperationException(
                    "Support for groups properties not available");
        }
        
        boolean adminChanges = false;

        List<Modification> mods = new ArrayList<Modification>();
        List<Modification> adminMods = new ArrayList<Modification>();
        if (withActivate)
        {
            mods.add(new Modification(ModificationType.DELETE, "nsaccountlock"));
            adminMods.add(new Modification(ModificationType.DELETE, "nsaccountlock"));
            adminChanges = true;
        }

        if (group.description == null)
        {
            mods.add(new Modification(ModificationType.REPLACE, "description"));
        }
        else
        {
            mods.add(new Modification(ModificationType.REPLACE, "description", group.description));
        }
        try
        {
            Set<String> newMembers = new HashSet<String>();
            for (User<?> member : group.getUserMembers())
            {
                DN memberDN = userPersist.getUserDN(member);
                newMembers.add(memberDN.toNormalizedString());
            }
            for (Group gr : group.getGroupMembers())
            {
                if (!checkGroupExists(gr.getID()))
                {
                    throw new GroupNotFoundException(gr.getID());
                }
                DN grDN = getGroupDN(gr.getID());
                newMembers.add(grDN.toNormalizedString());
            }

            Set<String> newAdmins = new HashSet<String>();
            Set<User<? extends Principal>> existingUserAdmins = new HashSet<User<? extends Principal>>(0);
            if (existing != null)
            {
                    existingUserAdmins = existing.getUserAdmins();
            }
            for (User<?> member : group.getUserAdmins())
            {
                    DN memberDN = userPersist.getUserDN(member);
                    newAdmins.add(memberDN.toNormalizedString());
                    if (!existingUserAdmins.contains(member))
                {
                    adminChanges = true;
                }
            }

            Set<Group> existingGroupAdmins = new HashSet<Group>(0);
            if (existing != null)
            {
                    existingGroupAdmins = existing.getGroupAdmins();
            }
            for (Group gr : group.getGroupAdmins())
            {
                if (!checkGroupExists(gr.getID()))
                {
                    throw new GroupNotFoundException(gr.getID());
                }

                    DN grDN = getGroupDN(gr.getID());
                    newAdmins.add(grDN.toNormalizedString());
                    if (!existingGroupAdmins.contains(gr))
                {
                    adminChanges = true;
                }
            }

            mods.add(new Modification(ModificationType.REPLACE, "uniquemember", 
                    (String[]) newMembers.toArray(new String[newMembers.size()])));
            adminMods.add(new Modification(ModificationType.REPLACE, "uniquemember", 
                    (String[]) newAdmins.toArray(new String[newAdmins.size()])));
        
            // modify admin group first (if necessary)
            if (adminChanges)
            {   
            ModifyRequest modifyRequest = new ModifyRequest(getAdminGroupDN(group.getID()), adminMods);

                modifyRequest.addControl(
                        new ProxiedAuthorizationV2RequestControl(
                                "dn:" + getSubjectDN().toNormalizedString()));
                
                LdapDAO.checkLdapResult(getConnection().modify(modifyRequest).getResultCode());
            }
            
            // modify the group itself now
            ModifyRequest modifyRequest = new ModifyRequest(getGroupDN(group.getID()), mods);

            modifyRequest.addControl(
                    new ProxiedAuthorizationV2RequestControl(
                            "dn:" + getSubjectDN().toNormalizedString()));
            
            LdapDAO.checkLdapResult(getConnection().modify(modifyRequest).getResultCode());
        }
        catch (LDAPException e1)
        {
            logger.debug("Modify Exception: " + e1, e1);
            LdapDAO.checkLdapResult(e1.getResultCode());
        }
        try
        {
            if (withActivate)
            {
                return new ActivatedGroup(getGroup(group.getID()));
            }
            else
            {
                return getGroup(group.getID());
            }
        }
        catch (GroupNotFoundException e)
        {
            throw new RuntimeException("BUG: modified group not found (" + group.getID() + ")");
        }
    }

    /**
     * Deletes the group.
     * 
     * @param groupID The group to delete
     * 
     * @throws GroupNotFoundException If the group was not found.
     * @throws TransientException If an temporary, unexpected problem occurred.
     */
    public void deleteGroup(final String groupID)
        throws GroupNotFoundException, TransientException,
               AccessControlException
    {
        deleteGroup(getGroupDN(groupID), groupID, false);
        deleteGroup(getAdminGroupDN(groupID), groupID, true);
    }
    
    private void deleteGroup(final DN groupDN, final String groupID, 
                             final boolean isAdmin)
        throws GroupNotFoundException, TransientException,
               AccessControlException
    {
        Group group = getGroup(groupDN, groupID, true);
        List<Modification> modifs = new ArrayList<Modification>();
        modifs.add(new Modification(ModificationType.ADD, "nsaccountlock", "true"));
        
        if (isAdmin)
        {
            if (!group.getGroupAdmins().isEmpty() || 
                !group.getUserAdmins().isEmpty())
            {
                modifs.add(new Modification(ModificationType.DELETE, "uniquemember"));
            }
        }
        else
        {
            if (!group.getGroupMembers().isEmpty() || 
                !group.getUserMembers().isEmpty())
            {
                modifs.add(new Modification(ModificationType.DELETE, "uniquemember"));
            }
        }

        ModifyRequest modifyRequest = new ModifyRequest(groupDN, modifs);
        try
        {
            modifyRequest.addControl(
                    new ProxiedAuthorizationV2RequestControl(
                            "dn:" + getSubjectDN().toNormalizedString()));
            LDAPResult result = getConnection().modify(modifyRequest);
            LdapDAO.checkLdapResult(result.getResultCode());
        }
        catch (LDAPException e1)
        {
            logger.debug("Delete Exception: " + e1, e1);
            LdapDAO.checkLdapResult(e1.getResultCode());
        }
        
        try
        {
            getGroup(getGroupDN(group.getID()), null, false);
            throw new RuntimeException("BUG: group not deleted " + group.getID());
        }
        catch (GroupNotFoundException ignore) { }
    }
    
    /**
     * Obtain a Collection of Groups that fit the given query. The returned groups
     * will not include members.
     * 
     * @param userID The userID.
     * @param role Role of the user, either owner, member, or read/write.
     * @param groupID The Group ID.
     * 
     * @return possibly empty collection of Group that match the query
     * @throws TransientException  If an temporary, unexpected problem occurred.
     * @throws UserNotFoundException
     * @throws GroupNotFoundException
     */
    public Collection<Group> getGroups(final T userID, final Role role, 
                                       final String groupID)
        throws TransientException, AccessControlException,
               GroupNotFoundException, UserNotFoundException
    {
        User<T> user = new User<T>(userID);
        DN userDN = null;
        try
        {
            userDN = userPersist.getUserDN(user);
        }
        catch (UserNotFoundException e)
        {
            // no anonymous searches
            throw new AccessControlException("Not authorized to search");
        }
        
        Collection<Group> ret;
        if (role == Role.OWNER)
        {
            ret = getOwnerGroups(user, userDN, groupID);
        }
        else
        {
            Collection<DN> groupDNs = null;
            
            if (role == Role.MEMBER)
            {
                groupDNs = getMemberGroups(user, userDN, groupID, false);
            }
            else if (role == Role.ADMIN)
            {
                groupDNs = getMemberGroups(user, userDN, groupID, true);
            }
            else
                throw new IllegalArgumentException("null role");
                        
            ret = new ArrayList<Group>();
            try
            {
                for (DN groupDN : groupDNs)
                {
                    if (role == Role.ADMIN)
                    {
                        groupDN = new DN(groupDN.getRDNString() + "," + config.getGroupsDN());
                    }
                    try
                    {
                        Group g = getGroup(groupDN, null, false);
                        logger.debug("found group: " + g.getID());
                        ret.add(g);
                    }
                    catch (GroupNotFoundException e)
                    {
                        final String message = "BUG: group " + groupDN + " not found but " +
                                               "membership exists (" + userID + ")";
                        logger.error(message);
                    }
                }
            }
            catch (LDAPException e)
            {
                logger.debug("getGroups Exception: " + e, e);
                throw new TransientException("Error getting group", e);
            }
        }
        
        logger.debug("found: " + ret.size() + "groups matching " + userID + "," + role + "," + groupID);
        return ret;
    }
    
    protected Collection<Group> getOwnerGroups(final User<T> user, 
                                            final DN userDN,
                                            final String groupID)
        throws TransientException, AccessControlException
    {
        Collection<Group> ret = new ArrayList<Group>();
        try
        {                      
            Filter filter = Filter.createNOTFilter(Filter.createPresenceFilter("nsaccountlock"));
        
            filter = Filter.createANDFilter(filter, 
                Filter.createEqualityFilter("owner", userDN.toNormalizedString()));
            
            if (groupID != null)
            {
                DN groupDN = getGroupDN(groupID);
                filter = Filter.createANDFilter(filter, 
                    Filter.createEqualityFilter("entrydn", groupDN.toNormalizedString()));
            }
            
            SearchRequest searchRequest =  new SearchRequest(
                    config.getGroupsDN(), SearchScope.SUB, filter, GROUP_ATTRS);
            
            searchRequest.addControl(
                    new ProxiedAuthorizationV2RequestControl("dn:" + 
                            getSubjectDN().toNormalizedString()));
            
            SearchResult results = getConnection().search(searchRequest);
            for (SearchResultEntry result : results.getSearchEntries())
            {
                ret.add(createGroupFromEntry(result));
            }
        }
        catch (LDAPException e1)
        {
            logger.debug("getOwnerGroups Exception: " + e1, e1);
            LdapDAO.checkLdapResult(e1.getResultCode());
        }
        return ret; 
    }
    
    private Group createGroupFromEntry(SearchResultEntry result)
        throws LDAPException
    {
        if (result.getAttribute("nsaccountlock") != null)
        {
            throw new RuntimeException("BUG: found group with nsaccountlock set: " + result.getAttributeValue("entrydn").toString());  
        }
        String entryDN = result.getAttributeValue("entrydn");
        String groupName = result.getAttributeValue("cn");
        DN ownerDN = result.getAttributeValueAsDN("owner");
        if (ownerDN == null)
            throw new AccessControlException(groupName);
        try
        {
            User owner = userPersist.getMember(ownerDN);
            Group g = new Group(groupName, owner);
            if (result.hasAttribute("description"))
                g.description = result.getAttributeValue("description");
            if (result.hasAttribute("modifytimestamp"))
                g.lastModified = result.getAttributeValueAsDate("modifytimestamp");
            return g;
        }
        catch(UserNotFoundException ex)
        {
            throw new RuntimeException("Invalid state: owner does not exist: " + ownerDN + " group: " + entryDN);
        }
    }
    
    protected Collection<DN> getMemberGroups(final User<T> user, 
                                             final DN userDN, 
                                             final String groupID,
                                             final boolean isAdmin)
        throws TransientException, AccessControlException,
               GroupNotFoundException, UserNotFoundException
    {
        Collection<DN> groupDNs = new HashSet<DN>();
        if (groupID != null)
        {
            DN groupDN;
            if (isAdmin)
            {
                groupDN = getAdminGroupDN(groupID);
            }
            else
            {
                groupDN = getGroupDN(groupID);
            }
            if (userPersist.isMember(user.getUserID(),
                                     groupDN.toNormalizedString()))
            {
                groupDNs.add(groupDN);
            }
        }
        else
        {
            Collection<DN> memberGroupDNs = 
                    userPersist.getUserGroups(user.getUserID(), isAdmin);
            groupDNs.addAll(memberGroupDNs);
        }
        return groupDNs;
    }
    
    /**
     * 
     * @param groupID
     * @return 
     */
    protected DN getGroupDN(final String groupID) throws TransientException
    {
        try
        {
            return new DN("cn=" + groupID + "," + config.getGroupsDN());
        }
        catch (LDAPException e)
        {
            logger.debug("getGroupDN Exception: " + e, e);
            LdapDAO.checkLdapResult(e.getResultCode());
        }
        throw new IllegalArgumentException(groupID + " not a valid group ID");
    }
    
    /**
     * 
     * @param groupID
     * @return 
     */
    protected DN getAdminGroupDN(final String groupID) throws TransientException
    {
        try
        {
            return new DN("cn=" + groupID + "," + config.getAdminGroupsDN());
        }
        catch (LDAPException e)
        {
            logger.debug("getAdminGroupDN Exception: " + e, e);
            LdapDAO.checkLdapResult(e.getResultCode());
        }
        throw new IllegalArgumentException(groupID + " not a valid group ID");
    }
    
    /**
     * 
     * @param owner
     * @return
     * @throws UserNotFoundException 
     */
    protected boolean isCreatorOwner(final User<? extends Principal> owner)
        throws UserNotFoundException
    {
        try
        {
            User<X500Principal> subjectUser = 
                    userPersist.getMember(getSubjectDN());
            if (subjectUser.equals(owner))
            {
                return true;
            }
            return false;
        }
        catch (LDAPException e)
        {
        	logger.debug("isCreatorOwner Exception: " + e, e);
            throw new RuntimeException(e);
        }
    }
    
    private boolean checkGroupExists(String groupID)
            throws LDAPException, TransientException
    {
        try
        {
            Group g = getGroup(groupID, false);
            return true;
        }
        catch(GroupNotFoundException ex)
        {
            return false;
        }
        finally { }
    }        

}