Package org.jahia.services.usermanager.jcr

Source Code of org.jahia.services.usermanager.jcr.JCRGroupManagerProvider

/**
* This file is part of Jahia, next-generation open source CMS:
* Jahia's next-generation, open source CMS stems from a widely acknowledged vision
* of enterprise application convergence - web, search, document, social and portal -
* unified by the simplicity of web content management.
*
* For more information, please visit http://www.jahia.com.
*
* Copyright (C) 2002-2011 Jahia Solutions Group SA. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* As a special exception to the terms and conditions of version 2.0 of
* the GPL (or any later version), you may redistribute this Program in connection
* with Free/Libre and Open Source Software ("FLOSS") applications as described
* in Jahia's FLOSS exception. You should have received a copy of the text
* describing the FLOSS exception, and it is also available here:
* http://www.jahia.com/license
*
* Commercial and Supported Versions of the program (dual licensing):
* alternatively, commercial and supported versions of the program may be used
* in accordance with the terms and conditions contained in a separate
* written agreement between you and Jahia Solutions Group SA.
*
* If you are unsure which license is appropriate for your use,
* please contact the sales department at sales@jahia.com.
*/

package org.jahia.services.usermanager.jcr;

import org.jahia.services.content.*;
import org.slf4j.Logger;
import org.apache.commons.lang.StringUtils;
import org.jahia.api.Constants;
import org.jahia.exceptions.JahiaException;
import org.jahia.exceptions.JahiaInitializationException;
import org.jahia.services.cache.Cache;
import org.jahia.services.cache.CacheService;
import org.jahia.services.sites.JahiaSite;
import org.jahia.services.sites.JahiaSitesService;
import org.jahia.services.usermanager.*;

import javax.jcr.*;
import javax.jcr.query.Query;
import javax.jcr.query.QueryResult;
import javax.jcr.query.Row;
import javax.jcr.query.RowIterator;
import java.util.*;

/**
* JCR-based implementation of the Group manager provider interface
*
* @author : rincevent
* @since JAHIA 6.5
*        Created : 8 juil. 2009
*/
public class JCRGroupManagerProvider extends JahiaGroupManagerProvider {
    private transient static Logger logger = org.slf4j.LoggerFactory.getLogger(JCRGroupManagerProvider.class);
    private transient JCRTemplate jcrTemplate;
    private static JCRGroupManagerProvider mGroupManagerProvider;
    private JCRUserManagerProvider userManagerProvider;
    private transient JahiaSitesService sitesService;
    private transient CacheService cacheService;
    private transient Cache<String, JCRGroup> cache;
    private Cache<String, List<String>> membershipCache;
    public static final String JCR_GROUPMEMBERSHIP_CACHE = "JCRGroupMembershipCache";

    /**
     * Create an new instance of the User Manager Service if the instance do not
     * exist, or return the existing instance.
     *
     * @return Return the instance of the User Manager Service.
     */
    public static JCRGroupManagerProvider getInstance() {
        if (mGroupManagerProvider == null) {
            mGroupManagerProvider = new JCRGroupManagerProvider();
        }
        return mGroupManagerProvider;
    }

    public void setJcrTemplate(JCRTemplate jcrTemplate) {
        this.jcrTemplate = jcrTemplate;
    }

    public void setSitesService(JahiaSitesService sitesService) {
        this.sitesService = sitesService;
    }

    public void setCacheService(CacheService cacheService) {
        this.cacheService = cacheService;
    }

    /**
     * Create a new group in the system.
     *
     * @param hidden
     * @return a reference on a group object on success, or if the groupname
     *         already exists or another error occured, null is returned.
     */
    public JCRGroup createGroup(final int siteID, final String name, final Properties properties,
                                final boolean hidden) {
        try {
            return jcrTemplate.doExecuteWithSystemSession(new JCRCallback<JCRGroup>() {
                public JCRGroup doInJCR(JCRSessionWrapper session) throws RepositoryException {
                    try {
                        JCRNodeWrapper nodeWrapper;
                        JCRNodeWrapper parentNodeWrapper;
                        if (siteID == 0) {
                            parentNodeWrapper = session.getNode("/groups");
                        } else {
                            String siteName = sitesService.getSite(siteID).getSiteKey();
                            parentNodeWrapper = session.getNode("/sites/" + siteName + "/groups");
                        }
                        session.checkout(parentNodeWrapper);
                        nodeWrapper = parentNodeWrapper.addNode(name, Constants.JAHIANT_GROUP);
                        nodeWrapper.setProperty(JCRGroup.J_HIDDEN, hidden);
                        if (properties != null) {
                            for (Map.Entry<Object, Object> entry : properties.entrySet()) {
                                if (entry.getValue() instanceof Boolean) {
                                    nodeWrapper.setProperty((String) entry.getKey(), (Boolean) entry.getValue());
                                } else {
                                    nodeWrapper.setProperty((String) entry.getKey(), (String) entry.getValue());
                                }
                            }
                        }
                        session.save();
                        JCRGroup jcrGroup = new JCRGroup(nodeWrapper, siteID);
                        final String trueGroupKey = name + ":" + siteID;
                        getCache().put(trueGroupKey, jcrGroup);
                        return jcrGroup;
                    } catch (JahiaException e) {
                        logger.error("Error while creating group", e);
                    }
                    return null;
                }
            });
        } catch (RepositoryException e) {
            logger.error("Error while creating group", e);
            return null;
        }
    }

    public boolean deleteGroup(JahiaGroup group) {
        if (group instanceof JCRGroup) {
            final JCRGroup jcrGroup = (JCRGroup) group;
            try {
                Boolean aBoolean = jcrTemplate.doExecuteWithSystemSession(deleteCallback(jcrGroup));
                aBoolean = aBoolean && jcrTemplate.doExecuteWithSystemSession(null, Constants.LIVE_WORKSPACE, deleteCallback(jcrGroup));
                return aBoolean;
            } catch (RepositoryException e) {
                logger.error("Error while deleting group", e);
            } finally {
                updateCache(group);
            }
        }
        return false;
    }

    private JCRCallback<Boolean> deleteCallback(final JCRGroup jcrGroup) {
        return new JCRCallback<Boolean>() {
            public Boolean doInJCR(JCRSessionWrapper session) throws RepositoryException {
                Node node = null;
                try {
                    node = jcrGroup.getNode(session);
                } catch (ItemNotFoundException e) {
                    return true;
                }

                PropertyIterator pi = node.getWeakReferences("j:member");
                while (pi.hasNext()) {
                    JCRPropertyWrapper member = (JCRPropertyWrapper) pi.next();
                    member.getParent().remove();
                }

                session.checkout(node.getParent());
                session.checkout(node);
                node.remove();
                session.save();
                return true;
            }
        };
    }

    /**
     * Get all JahiaSite objects where the user has an access.
     *
     * @param user, the user you want to get his access grantes sites list.
     * @return Return a List containing all JahiaSite objects where the user has an access.
     */
    public List<JahiaSite> getAdminGrantedSites(JahiaUser user) {
        return null;
    }

    /**
     *
     */
    public JahiaGroup getAdministratorGroup(int siteID) {
        return lookupGroup(siteID, siteID == 0 ? JahiaGroupManagerService.ADMINISTRATORS_GROUPNAME : JahiaGroupManagerService.SITE_ADMINISTRATORS_GROUPNAME);
    }

    /**
     * Return a <code>List</code) of <code>String</code> representing all the
     * group keys of a site.
     *
     * @return Return a List of identifier of all groups of this site.
     * @author NK
     */
    public List<String> getGroupList() {
        try {
            return jcrTemplate.doExecuteWithSystemSession(new JCRCallback<List<String>>() {
                public List<String> doInJCR(JCRSessionWrapper session) throws RepositoryException {
                    List<String> groups = new ArrayList<String>();
                    if (session.getWorkspace().getQueryManager() != null) {
                        String query =
                                "SELECT [j:nodename] FROM [" + Constants.JAHIANT_GROUP + "] as group WHERE group.[" +
                                        JCRGroup.J_EXTERNAL + "] = 'false' ORDER BY group.[j:nodename]";
                        Query q = session.getWorkspace().getQueryManager().createQuery(query, Query.JCR_SQL2);
                        QueryResult qr = q.execute();
                        RowIterator rows = qr.getRows();
                        while (rows.hasNext()) {
                            Row groupsFolderNode = rows.nextRow();
                            String groupName = "{jcr}" + groupsFolderNode.getValue("j:nodename").getString();
                            if (!groups.contains(groupName)) {
                                groups.add(groupName);
                            }
                        }
                    }
                    return groups;
                }
            });
        } catch (RepositoryException e) {
            logger.error("Error retrieving group list", e);
            return new ArrayList<String>();
        }
    }

    /**
     * Return a <code>List</code) of <code>String</code> representing all the
     * group keys of a site.
     *
     * @return Return a List of identifier of all groups of this site.
     * @author NK
     */
    public List<String> getGroupList(final int siteID) {
        try {
            return jcrTemplate.doExecuteWithSystemSession(new JCRCallback<List<String>>() {
                public List<String> doInJCR(JCRSessionWrapper session) throws RepositoryException {
                    final List<String> groups = new ArrayList<String>();
                    try {
                        if (session.getWorkspace().getQueryManager() != null) {
                            String siteName = sitesService.getSite(siteID).getSiteKey();
                            String query = "SELECT [j:nodename] FROM [" + Constants.JAHIANT_GROUP +
                                    "] as group WHERE group.[" + JCRGroup.J_EXTERNAL +
                                    "] = 'false' AND ISCHILDNODE(group, '/sites/" + siteName +
                                    "/groups') ORDER BY group.[j:nodename]";
                            Query q = session.getWorkspace().getQueryManager().createQuery(query, Query.JCR_SQL2);
                            QueryResult qr = q.execute();
                            RowIterator rows = qr.getRows();
                            while (rows.hasNext()) {
                                Row groupsFolderNode = rows.nextRow();
                                String groupName =
                                        "{jcr}" + groupsFolderNode.getValue("j:nodename").getString() + ":" + siteID;
                                if (!groups.contains(groupName)) {
                                    groups.add(groupName);
                                }
                            }
                        }
                    } catch (JahiaException e) {
                        logger.error("Error retrieving group list for site " + siteID, e);
                    }
                    return groups;
                }
            });

        } catch (RepositoryException e) {
            logger.error("Error retrieving group list for site " + siteID, e);
            return new ArrayList<String>();
        }
    }

    /**
     * Return a <code>List</code) of <code>String</code> representing all the
     * group names.
     *
     * @return Return a List of strings containing all the group names.
     */
    public List<String> getGroupnameList() {
        try {
            return jcrTemplate.doExecuteWithSystemSession(new JCRCallback<List<String>>() {
                public List<String> doInJCR(JCRSessionWrapper session) throws RepositoryException {
                    List<String> groups = new ArrayList<String>();
                    if (session.getWorkspace().getQueryManager() != null) {
                        String query =
                                "SELECT [j:nodename] FROM [" + Constants.JAHIANT_GROUP + "] as group WHERE group.[" +
                                        JCRGroup.J_EXTERNAL + "] = 'false' ORDER BY group.[j:nodename]";
                        Query q = session.getWorkspace().getQueryManager().createQuery(query, Query.JCR_SQL2);
                        QueryResult qr = q.execute();
                        RowIterator rows = qr.getRows();
                        while (rows.hasNext()) {
                            Row groupsFolderNode = rows.nextRow();
                            String groupName = groupsFolderNode.getValue("j:nodename").getString();
                            if (!groups.contains(groupName)) {
                                groups.add(groupName);
                            }
                        }
                    }
                    return groups;
                }
            });
        } catch (RepositoryException e) {
            logger.error("Error retrieving group name list", e);
            return new ArrayList<String>();
        }
    }

    /**
     * Return a <code>List</code) of <code>String</code> representing all the
     * group names of a site.
     *
     * @return Return a List of strings containing all the group names.
     */
    public List<String> getGroupnameList(final int siteID) {
        try {
            return jcrTemplate.doExecuteWithSystemSession(new JCRCallback<List<String>>() {
                public List<String> doInJCR(JCRSessionWrapper session) throws RepositoryException {
                    List<String> groups = new ArrayList<String>();
                    try {
                        if (session.getWorkspace().getQueryManager() != null) {
                            String siteName = sitesService.getSite(siteID).getSiteKey();
                            String query = "SELECT [j:nodename] FROM [" + Constants.JAHIANT_GROUP +
                                    "] as group WHERE group.[" + JCRGroup.J_EXTERNAL +
                                    "] = 'false' AND ISCHILDNODE(group, '/sites/" + siteName +
                                    "/groups') ORDER BY group.[j:nodename]";
                            Query q = session.getWorkspace().getQueryManager().createQuery(query, Query.JCR_SQL2);
                            QueryResult qr = q.execute();
                            RowIterator rows = qr.getRows();
                            while (rows.hasNext()) {
                                Row groupsFolderNode = rows.nextRow();
                                String groupName = groupsFolderNode.getValue("j:nodename").getString() + ":" + siteID;
                                if (!groups.contains(groupName)) {
                                    groups.add(groupName);
                                }
                            }
                        }
                    } catch (JahiaException e) {
                        logger.error("Error retrieving group name list for site " + siteID, e);
                    }
                    return groups;
                }
            });
        } catch (RepositoryException e) {
            logger.error("Error retrieving group name list for site " + siteID, e);
            return new ArrayList<String>();
        }
    }

    /**
     * Return an instance of the guest group
     *
     * @return Return the instance of the guest group. Return null on any failure.
     */
    public JahiaGroup getGuestGroup(int siteID) {
        return lookupGroup(0, JahiaGroupManagerService.GUEST_GROUPNAME);
    }

    /**
     * Return the list of groups to which the specified user has access.
     *
     * @param user Valid reference on an existing group.
     * @return Return a List of strings holding all the group names to
     *         which the user as access. On any error, the returned List
     *         might be null.
     */
    public List<String> getUserMembership(JahiaUser user) {
        return getMembership(user);
    }

    /**
     * Return the list of groups to which the specified principal (user or group) belongs.
     *
     * @param principal a JCR user or group
     * @return the list of groups to which the specified principal (user or group) belongs
     */
    public List<String> getMembership(final JahiaPrincipal principal) {
        String uuid = null;
        if (principal instanceof JCRPrincipal) {
            uuid = ((JCRPrincipal) principal).getIdentifier();
        } else {
            if (principal instanceof JahiaUser) {
                JCRUser extUser = userManagerProvider.lookupExternalUser((JahiaUser) principal);
                if (extUser != null) {
                    uuid = extUser.getIdentifier();
                }
            } else if (principal instanceof JahiaGroup) {
                JCRGroup extGroup = lookupExternalGroup(((JahiaGroup) principal).getGroupname());
                if (extGroup != null) {
                    uuid = extGroup.getIdentifier();
                }
            }
        }
        if (uuid != null) {
            try {
                final String principalId = uuid;
                Cache<String, List<String>> membershipCache = getMembershipCache();

                List<String> membership = membershipCache.get(uuid);
                if (membership != null) {
                    return membership;
                }
                final Cache<String, List<String>> finalObjectCache = membershipCache;
                return jcrTemplate.doExecuteWithSystemSession(new JCRCallback<List<String>>() {
                    public List<String> doInJCR(JCRSessionWrapper session) throws RepositoryException {
                        List<String> groups = new ArrayList<String>();
                        try {
                            recurseOnGroups(session, groups, principalId);
                        } catch (JahiaException e) {
                            logger.warn("Error retrieving membership for user " + principal.getName(), e);
                        }
                        if (principal instanceof JahiaUser) {
                            if (!principal.getName().equals(JahiaUserManagerService.GUEST_USERNAME)) {
                                groups.add(JahiaGroupManagerService.USERS_GROUPNAME);
                            }
                            groups.add(JahiaGroupManagerService.GUEST_GROUPNAME);
                        }
                        finalObjectCache.put(principalId, groups);
                        return groups;
                    }

                    private void recurseOnGroups(JCRSessionWrapper session, List<String> groups, String principalId) throws RepositoryException, JahiaException {
                        JCRNodeWrapper node = session.getNodeByUUID(principalId);
                        PropertyIterator weakReferences = node.getWeakReferences();
                        while (weakReferences.hasNext()) {
                            try {
                                Property property = weakReferences.nextProperty();
                                if (property.getPath().contains("j:members")) {
                                    Node group = property.getParent().getParent().getParent();
                                    if (group.isNodeType("jnt:group")) {
                                        int siteID = 0;
                                        try {
                                            String siteKey = group.getParent().getParent().getName();
                                            if (!StringUtils.isEmpty(siteKey)) {
                                                siteID = sitesService.getSiteByKey(siteKey).getID();
                                            }
                                        } catch (NullPointerException e) {
                                            siteID = 0;
                                        }
                                        groups.add(group.getName() + ":" + siteID);
                                        recurseOnGroups(session, groups, group.getIdentifier());
                                    }
                                }
                            } catch (ItemNotFoundException e) {
                                logger.warn("Cannot find group for "+node.getPath(),e);
                            }
                        }
                    }

                }

                );
            } catch (RepositoryException e) {
                logger.error("Error retrieving membership for user " + principal.getName() + ", will return empty list", e);
            } catch (JahiaInitializationException e) {
                logger.error("Error retrieving membership for user " + principal.getName() + ", will return empty list", e);
            }
        }
        return new ArrayList<String>();
    }


    /**
     * Return an instance of the users group.
     *
     * @return Return the instance of the users group. Return null on any failure
     */

    public JahiaGroup getUsersGroup(int siteID) {
        return lookupGroup(0, JahiaGroupManagerService.USERS_GROUPNAME);
    }

    /**
     * This function checks on a given site if the groupname has already been
     * assigned to another group.
     *
     * @param siteID siteID the site id
     * @param name   String representing the unique group name.
     * @return Return true if the specified username has not been assigned yet,
     *         return false on any failure.
     */
    public boolean groupExists(final int siteID, final String name) {
        try {
            return jcrTemplate.doExecuteWithSystemSession(new JCRCallback<Boolean>() {
                public Boolean doInJCR(JCRSessionWrapper session) throws RepositoryException {
                    try {
                        Node groupNode;
                        if (siteID == 0) {
                            groupNode = session.getNode("/groups/" + name.trim());
                        } else {
                            String siteName = sitesService.getSite(siteID).getSiteKey();
                            groupNode = session.getNode("/sites/" + siteName + "/groups/" + name.trim());
                        }
                        return groupNode != null && !groupNode.getProperty(JCRGroup.J_EXTERNAL).getBoolean();
                    } catch (JahiaException e) {
                        logger.error("Error testing existence of group " + name + " for site " + siteID, e);
                        return false;
                    }
                }
            });

        } catch (PathNotFoundException e) {
            logger.debug("Error testing existence of group " + name + " for site " + siteID, e);
        } catch (RepositoryException e) {
            logger.warn("Error testing existence of group " + name + " for site " + siteID, e);
        }
        return false;
    }

    /**
     * Lookup the group information from the underlying system (DB, LDAP, ... )
     * Try to lookup the group into the cache, if it's not in the cache, then
     * load it into the cache from the database.
     *
     * @param groupKey Group's unique identification key.
     * @return Return a reference on a the specified group name. Return null
     *         if the group doesn't exist or when any error occured.
     */
    public JahiaGroup lookupGroup(String groupKey) {
        int siteID = 0;
        final String name;
        if (groupKey.contains(":")) {
            String[] splittedGroupKey = groupKey.split(":");
            siteID = Integer.valueOf(splittedGroupKey[1]);
            name = splittedGroupKey[0];
            if (JahiaGroupManagerService.GUEST_GROUPNAME.equals(name) || JahiaGroupManagerService.USERS_GROUPNAME.equals(name)) {
                siteID = 0;
            }
        } else {
            name = groupKey;
        }
        return lookupGroup(siteID, name);
    }

    /**
     * Lookup the group information from the underlying system (DB, LDAP, ... )
     * Try to lookup the group into the cache, if it's not in the cache, then
     * load it into the cache from the database.
     *
     * @param siteID the site id
     * @param name   Group's unique identification name.
     * @return Return a reference on a the specified group name. Return null
     *         if the group doesn't exist or when any error occured.
     */
    public JCRGroup lookupGroup(int siteID, final String name) {
        return lookupGroup(siteID, name, false);
    }

    /**
     * Lookup the external group information from the JCR.
     *
     * @param name Group's unique identification name.
     * @return an instance of the {@link JCRGroup} for an external group or null
     *         if the group cannot be found
     */
    public JCRGroup lookupExternalGroup(final String name) {
        return lookupGroup(0, name, true);
    }

    /**
     * Lookup the group information from the underlying system (DB, LDAP, ... )
     * Try to lookup the group into the cache, if it's not in the cache, then
     * load it into the cache from the database.
     *
     * @param siteID the site id
     * @param name   Group's unique identification name.
     * @return Return a reference on a the specified group name. Return null
     *         if the group doesn't exist or when any error occured.
     */
    private JCRGroup lookupGroup(int siteID, final String name, final boolean allowExternal) {
        try {
            if (name.equals(JahiaGroupManagerService.GUEST_GROUPNAME) || name.equals(JahiaGroupManagerService.USERS_GROUPNAME)) {
                siteID = 0;
            }
            final String trueGroupKey = name + ":" + siteID;
            if (getCache().containsKey(trueGroupKey)) {
                JCRGroup group = getCache().get(trueGroupKey);
                if (group == null) {
                    return null;
                }
                return !allowExternal && group.isExternal() ? null : group;
            }
            final int siteID1 = siteID;
            return jcrTemplate.doExecuteWithSystemSession(new JCRCallback<JCRGroup>() {
                public JCRGroup doInJCR(JCRSessionWrapper session) throws RepositoryException {
                    try {
                        Node groupNode;
                        try {
                            if (siteID1 <= 0) {
                                groupNode = session.getNode("/groups/" + name.trim());
                            } else {
                                JahiaSite site = sitesService.getSite(siteID1);
                                if (site == null) {
                                    // This can happen if this method is called during the creation of the site !
                                    logger.warn("Site " + siteID1 + " is not available, maybe it's being created ?");
                                    return null;
                                }
                                String siteName = site.getSiteKey();
                                groupNode = session.getNode("/sites/" + siteName + "/groups/" + name.trim());
                            }
                        } catch (PathNotFoundException e) {
                            getCache().put(trueGroupKey, null);
                            return null;
                        }
                        JCRGroup group = null;
                        boolean external = groupNode.getProperty(JCRGroup.J_EXTERNAL).getBoolean();
                        if (allowExternal || !external) {
                            group = getGroup(groupNode, name, siteID1, external);
                            getCache().put(trueGroupKey, group);
                        }
                        return group;
                    } catch (JahiaException e) {
                        logger.error("Error while retrieving group " + name + " for site " + siteID1, e);
                        return null;
                    }
                }
            });

        } catch (PathNotFoundException e) {
            logger.debug("Error while retrieving group " + name + " for site " + siteID, e);
        } catch (RepositoryException e) {
            logger.warn("Error while retrieving group " + name + " for site " + siteID, e);
        } catch (JahiaInitializationException e) {
            logger.error("Error while retrieving group " + name + " for site " + siteID, e);
        }
        return null;
    }

    private JCRGroup getGroup(Node usersFolderNode, String name, int siteID1, boolean external) {
        JCRGroup group;
        if (JahiaGroupManagerService.GUEST_GROUPNAME.equals(name)) {
            group = new GuestGroup(usersFolderNode, jcrTemplate, siteID1);
        } else if (JahiaGroupManagerService.USERS_GROUPNAME.equals(name)) {
            group = new UsersGroup(usersFolderNode, jcrTemplate, siteID1);
        } else {
            group = new JCRGroup(usersFolderNode, siteID1, external);
        }
        return group;
    }

    /**
     * Remove the specified user from all the membership lists of all the groups.
     *
     * @param user Reference on an existing user.
     * @return Return true on success, or false on any failure.
     */
    public boolean removeUserFromAllGroups(final JahiaUser user) {
        try {
            String uuid = null;
            if (user instanceof JCRUser) {
                uuid = ((JCRUser) user).getIdentifier();
            } else {
                JCRUser extUser = userManagerProvider.lookupExternalUser(user);
                if (extUser != null) {
                    uuid = extUser.getIdentifier();
                }
            }
            if (uuid != null) {
                final String id = uuid;
                return jcrTemplate.doExecuteWithSystemSession(new JCRCallback<Boolean>() {
                    public Boolean doInJCR(JCRSessionWrapper session) throws RepositoryException {
                        if (session.getWorkspace().getQueryManager() != null) {
                            String query = "SELECT * FROM [jnt:member] as m where m.[j:member] = '" + id +
                                    "' ORDER BY m.[j:nodename]";
                            Query q = session.getWorkspace().getQueryManager().createQuery(query, Query.JCR_SQL2);
                            QueryResult qr = q.execute();
                            NodeIterator nodes = qr.getNodes();
                            while (nodes.hasNext()) {
                                Node memberNode = nodes.nextNode();
                                memberNode.remove();
                            }
                            session.save();
                            return true;
                        }
                        return false;
                    }
                });
            }
        } catch (RepositoryException e) {
            logger.error("Error while removing user from all groups", e);
        }
        return false;
    }

    public Set<JahiaGroup> searchGroups(final int siteID, final Properties searchCriterias) {
        try {
            return jcrTemplate.doExecuteWithSystemSession(new JCRCallback<Set<JahiaGroup>>() {
                public Set<JahiaGroup> doInJCR(JCRSessionWrapper session) throws RepositoryException {
                    try {
                        Set<JahiaGroup> users = new HashSet<JahiaGroup>();
                        if (session.getWorkspace().getQueryManager() != null) {
                            String siteName = sitesService.getSite(siteID).getSiteKey();
                            StringBuilder query = new StringBuilder(
                                    "SELECT * FROM [" + Constants.JAHIANT_GROUP + "] as g WHERE g.[" +
                                            JCRGroup.J_EXTERNAL + "] = 'false' AND ISCHILDNODE(g, '/sites/" + siteName +
                                            "/groups')");
                            if (searchCriterias != null && searchCriterias.size() > 0) {
                                // Avoid wildcard attribute
                                if (!(searchCriterias.containsKey("*") && searchCriterias.size() == 1 &&
                                        searchCriterias.getProperty("*").equals("*"))) {
                                    Iterator<Map.Entry<Object, Object>> objectIterator =
                                            searchCriterias.entrySet().iterator();
                                    if (objectIterator.hasNext()) {
                                        query.append(" AND (");
                                        while (objectIterator.hasNext()) {
                                            Map.Entry<Object, Object> entry = objectIterator.next();
                                            String propertyKey = (String) entry.getKey();
                                            if ("groupname".equals(propertyKey)) {
                                                propertyKey = "j:nodename";
                                            }
                                            String propertyValue = (String) entry.getValue();
                                            if ("*".equals(propertyValue)) {
                                                propertyValue = "%";
                                            } else {
                                                if (propertyValue.contains("*")) {
                                                    propertyValue = propertyValue.replaceAll("\\*", "%");
                                                } else {
                                                    propertyValue = propertyValue + "%";
                                                }
                                            }
                                            if ("*".equals(propertyKey)) {
                                                query.append(
                                                        "(CONTAINS(g.*,'" + propertyValue.replaceAll("%", "")
                                                                + "') OR LOWER(u.[j:nodename]) LIKE '")
                                                    .append(propertyValue.toLowerCase()).append("') ");
                                            } else {
                                                query.append("LOWER(g.[" + propertyKey.replaceAll("\\.", "\\\\.") + "])")
                                                        .append(" LIKE '").append(propertyValue.toLowerCase()).append("'");
                                            }
                                            if (objectIterator.hasNext()) {
                                                query.append(" OR ");
                                            }
                                        }
                                        query.append(")");
                                    }
                                }
                            }
                            query.append(" ORDER BY g.[j:nodename]");
                            if (logger.isDebugEnabled()) {
                                logger.debug(query.toString());
                            }
                            Query q = session.getWorkspace().getQueryManager()
                                    .createQuery(query.toString(), Query.JCR_SQL2);
                            QueryResult qr = q.execute();
                            NodeIterator ni = qr.getNodes();
                            while (ni.hasNext()) {
                                Node usersFolderNode = ni.nextNode();
                                users.add(getGroup(usersFolderNode, usersFolderNode.getName(), siteID, false));
                            }
                        }
                        return users;
                    } catch (JahiaException e) {
                        logger.error("Error searching groups for site " + siteID, e);
                        return null;
                    }
                }
            });

        } catch (RepositoryException e) {
            logger.error("Error while searching groups", e);
            return new HashSet<JahiaGroup>();
        }
    }

    /**
     * This method indicates that any internal cache for a provider should be
     * updated because the value has changed and needs to be transmitted to the
     * other nodes in a clustering environment.
     *
     * @param jahiaGroup JahiaGroup the group to be updated in the cache.
     */
    public void updateCache(JahiaGroup jahiaGroup) {
        try {
            getCache().remove(jahiaGroup.getGroupKey());
        } catch (JahiaInitializationException e) {
            logger.error(e.getMessage(), e);
        }
    }

    public void start() throws JahiaInitializationException {
        getCache();
    }

    private Cache<String, JCRGroup> getCache() throws JahiaInitializationException {
        if (cache == null) {
            if (cacheService != null) {
                cache = cacheService.getCache("JCRGroupCache", true);
            }
        }

        return cache;
    }

    private Cache<String, List<String>> getMembershipCache() throws JahiaInitializationException {
        if (membershipCache == null) {
            if (cacheService != null) {
                membershipCache = cacheService.getCache(JCR_GROUPMEMBERSHIP_CACHE, true);
            }
        }
        return membershipCache;
    }

    public void stop() throws JahiaException {
        // do nothing
    }

    /**
     * @param userManagerProvider the userManagerProvider to set
     */
    public void setUserManagerProvider(JCRUserManagerProvider userManagerProvider) {
        this.userManagerProvider = userManagerProvider;
    }

    public void updateMembershipCache(String identifier) {
        try {
            getMembershipCache().remove(identifier);
        } catch (JahiaInitializationException e) {
            logger.error(e.getMessage(), e);
        }
    }

    @Override
    public void flushCache() {
        super.flushCache();
        try {
            getCache().flush();
            getMembershipCache().flush();
        } catch (JahiaInitializationException e) {
            throw new IllegalStateException(e);
        }
    }
}
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