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/*
 ************************************************************************
 *******************  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.
 *  liable in any event for any          Le CNRC ne pourra en aucun cas
 *  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
 *  written permission.                  préalable et particulière
 *                                       par écrit.
 *
 *  This file is part of the             Ce fichier fait partie du projet
 *  OpenCADC project.                    OpenCADC.
 *
 *  OpenCADC is free software:           OpenCADC est un logiciel libre ;
 *  you can redistribute it and/or       vous pouvez le redistribuer ou le
 *  modify it under the terms of         modifier suivant les termes de
 *  the GNU Affero General Public        la “GNU Affero General Public
 *  License as published by the          License” telle que publiée
 *  Free Software Foundation,            par la Free Software Foundation
 *  either version 3 of the              : soit la version 3 de cette
 *  License, or (at your option)         licence, soit (à votre gré)
 *  any later version.                   toute version ultérieure.
 *
 *  OpenCADC is distributed in the       OpenCADC est distribué
 *  hope that it will be useful,         dans l’espoir qu’il vous
 *  but WITHOUT ANY WARRANTY;            sera utile, mais SANS AUCUNE
 *  without even the implied             GARANTIE : sans même la garantie
 *  warranty of MERCHANTABILITY          implicite de COMMERCIALISABILITÉ
 *  or FITNESS FOR A PARTICULAR          ni d’ADÉQUATION À UN OBJECTIF
 *  PURPOSE.  See the GNU Affero         PARTICULIER. Consultez la Licence
 *  General Public License for           Générale Publique GNU Affero
 *  more details.                        pour plus de détails.
 *
 *  You should have received             Vous devriez avoir reçu une
 *  a copy of the GNU Affero             copie de la Licence Générale
 *  General Public License along         Publique GNU Affero avec
 *  with OpenCADC.  If not, see          OpenCADC ; si ce n’est
 *  <http://www.gnu.org/licenses/>.      pas le cas, consultez :
 *                                       <http://www.gnu.org/licenses/>.
 *
 *  $Revision: 4 $
 *
 ************************************************************************
 */
package ca.nrc.cadc.ac.server.ldap;

import ca.nrc.cadc.ac.*;
import ca.nrc.cadc.ac.server.UserPersistence;
import ca.nrc.cadc.net.TransientException;
import com.unboundid.ldap.sdk.DN;
import java.security.AccessControlException;
import java.security.Principal;
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import java.util.Collection;
import java.util.Map;

import org.apache.log4j.Logger;

public class LdapUserPersistence<T extends Principal>
    implements UserPersistence<T>
{
    private static final Logger logger = Logger.getLogger(LdapUserPersistence.class);
    private LdapConfig config;

    public LdapUserPersistence()
    {
        try
        {
            this.config = LdapConfig.getLdapConfig();
        }
        catch (RuntimeException e)
        {
            logger.error("test/config/LdapConfig.properties file required.", e);
        }
    }

    public Collection<User<Principal>> getUsers()
        throws TransientException, AccessControlException
    {
        LdapUserDAO<T> userDAO = null;
        try
        {
            userDAO = new LdapUserDAO<T>(config);
            return userDAO.getUsers();
        }
        finally
        {
            if (userDAO != null)
            {
                userDAO.close();
            }
        }
    }
    
    /**
     * Add the new user.
     *
     * @param user
     *
     * @return User instance.
     * 
     * @throws TransientException If an temporary, unexpected problem occurred.
     * @throws AccessControlException If the operation is not permitted.
     */
    public User<T> addUser(UserRequest<T> user)
        throws TransientException, AccessControlException,
               UserAlreadyExistsException
    {
        LdapUserDAO<T> userDAO = null;
        try
        {
            userDAO = new LdapUserDAO<T>(this.config);
            return userDAO.addUser(user);
        }
        finally
        {
            if (userDAO != null)
            {
                userDAO.close();
            }
        }
    }
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    /**
     * Get the user specified by userID.
     *
     * @param userID The userID.
     *
     * @return User instance.
     * 
     * @throws UserNotFoundException when the user is not found.
     * @throws TransientException If an temporary, unexpected problem occurred.
     * @throws AccessControlException If the operation is not permitted.
     */
    public User<T> getUser(T userID)
        throws UserNotFoundException, TransientException, AccessControlException
    {
        LdapUserDAO<T> userDAO = null;
            userDAO = new LdapUserDAO<T>(this.config);
            return userDAO.getUser(userID);
        }
        finally
        {
            if (userDAO != null)
            {
                userDAO.close();
            }
        }
    }

    /**
    * Get the user specified by userID whose account is pending approval.
    *
    * @param userID The userID.
    * @return User instance.
    * @throws UserNotFoundException  when the user is not found.
    * @throws TransientException     If an temporary, unexpected problem occurred.
    * @throws AccessControlException If the operation is not permitted.
    */
    public User<T> getPendingUser(final T userID) throws UserNotFoundException,
                                                         TransientException,
                                                         AccessControlException
    {
        LdapUserDAO<T> userDAO = null;
        try
        {
            userDAO = new LdapUserDAO<T>(this.config);
            return userDAO.getPendingUser(userID);
        }
        finally
        {
            if (userDAO != null)

    /**
     * Get the user specified by userID.
     *
     * @param userID The userID.
     *
     * @return Boolean.
     * 
     * @throws UserNotFoundException when the user is not found.
     * @throws TransientException If an temporary, unexpected problem occurred.
     * @throws AccessControlException If the operation is not permitted.
     */
    public Boolean doLogin(String userID, String password)
            throws UserNotFoundException, TransientException, AccessControlException
    {
        LdapUserDAO<T> userDAO = null;
        try
        {
            userDAO = new LdapUserDAO<T>(this.config);
            return userDAO.doLogin(userID, password);
    /**
     * Updated the user specified by User.
     *
     * @param user          The user to update.
     *
     * @return User instance.
     * 
     * @throws UserNotFoundException when the user is not found.
     * @throws TransientException If an temporary, unexpected problem occurred.
     * @throws AccessControlException If the operation is not permitted.
     */
    public User<T> modifyUser(User<T> user)
        throws UserNotFoundException, TransientException, 
               AccessControlException
    {
        LdapUserDAO<T> userDAO = null;
        try
        {
            userDAO = new LdapUserDAO<T>(this.config);
            return userDAO.modifyUser(user);
        }
        finally
        {
            if (userDAO != null)
            {
                userDAO.close();
            }
        }
    }

    /**
     * Update a user's password. The given user and authenticating user must match.
     *
     * @param user
     * @param oldPassword   current password.
     * @param newPassword   new password.
     * @throws UserNotFoundException If the given user does not exist.
     * @throws TransientException   If an temporary, unexpected problem occurred.
     * @throws AccessControlException If the operation is not permitted.
     */
    public void setPassword(User<T> user, final String oldPassword, final String newPassword)
            throws UserNotFoundException, TransientException, AccessControlException
    {
        LdapUserDAO<T> userDAO = null;
        try
        {
            userDAO = new LdapUserDAO<T>(this.config);
            userDAO.setPassword(user, oldPassword, newPassword);
        }
        finally
        {
            if (userDAO != null)
            {
                userDAO.close();
            }
        }
    }
    
    /**
     * Delete the user specified by userID.
     *
     * @param userID The userID.
     * 
     * @throws UserNotFoundException when the user is not found.
     * @throws TransientException If an temporary, unexpected problem occurred.
     * @throws AccessControlException If the operation is not permitted.
     */
    public void deleteUser(T userID)
        throws UserNotFoundException, TransientException, 
               AccessControlException
    {
        LdapUserDAO<T> userDAO = null;
        try
        {
            userDAO = new LdapUserDAO<T>(this.config);
            userDAO.deleteUser(userID);
        }
        finally
        {
            if (userDAO != null)
            {
                userDAO.close();
            }
        }
    }
     * Get all groups the user specified by userID belongs to. This method is created
     * to provide optimization for the LDAP server.
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     * 
     * @param userID The userID.
     * @param isAdmin return only admin Groups when true, else return non-admin
     *                Groups.
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     * 
     * @return Collection of Group DN.
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     * 
     * @throws UserNotFoundException  when the user is not found.
     * @throws TransientException If an temporary, unexpected problem occurred.
     * @throws AccessControlException If the operation is not permitted.
     */
    Collection<DN> getUserGroups(T userID, boolean isAdmin)
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        throws UserNotFoundException, TransientException, AccessControlException
    {
        LdapUserDAO<T> userDAO = null;
        try
        {
            userDAO = new LdapUserDAO<T>(this.config);
            return userDAO.getUserGroups(userID, isAdmin);
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        }
        finally
        {
            if (userDAO != null)
            {
                userDAO.close();
            }
        }
    }
    
    /**
     * Check whether the user is a member of the group. This method is created
     * to provide optimization for the LDAP server.
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     *
     * @param userID The userID.
     * @param groupID The groupID.
     *
     * @return true or false
     *
     * @throws UserNotFoundException If the user is not found.
     * @throws TransientException If an temporary, unexpected problem occurred.
     * @throws AccessControlException If the operation is not permitted.
     */
    boolean isMember(T userID, String groupID)
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        throws UserNotFoundException, TransientException,
               AccessControlException
    {
        LdapUserDAO<T> userDAO = null;
        try
        {
            userDAO = new LdapUserDAO<T>(this.config);
            return userDAO.isMember(userID, groupID);
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        }
        finally
        {
            if (userDAO != null)
            {
                userDAO.close();
            }
        }
    }