/**
 * Copyright (C) 2009 eXo Platform SAS.
 * 
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 * 
 * This software 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.exoplatform.web.security;

import org.gatein.wci.security.Credentials;

/**
 * The token store is a place where temporary tokens are held.
 *
 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
 * @version $Revision$
 */
public interface TokenStore
{
   /**
    * Create a token and returns it. The store state is modified as it retains the token until
    * it is removed either explicitely or because the token validity is expired.
    * 
    * @param credentials the credentials
    * @return the token key
    * @throws IllegalArgumentException if the validity is not greater than zero
    * @throws NullPointerException if the payload is null
    */
   String createToken(Credentials credentials) throws IllegalArgumentException, NullPointerException;

   /**
    * Validates a token. If the token is valid it returns the attached credentials. The store state may be modified
    * by the removal of the token. The token is removed either if the remove argument is set to true of if the
    * token is not anymore valid.
    *
    * @param tokenKey the token key
    * @param remove true if the token must be removed regardless its validity
    * @return the attached credentials or null
    * @throws NullPointerException if the token key argument is null
    */
   Credentials validateToken(String tokenKey, boolean remove) throws NullPointerException;

}
