| /* ClientStore.java -- |
| Copyright (C) 2003, 2006 Free Software Foundation, Inc. |
| |
| This file is a part of GNU Classpath. |
| |
| GNU Classpath 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. |
| |
| GNU Classpath 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 GNU Classpath; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 |
| USA |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.javax.crypto.sasl.srp; |
| |
| import java.util.HashMap; |
| |
| /** |
| * The client-side implementation of the SRP security context store. |
| */ |
| public class ClientStore |
| { |
| /** The underlying singleton. */ |
| private static ClientStore singleton = null; |
| /** The map of uid --> SASL Security Context record. */ |
| private static final HashMap uid2ssc = new HashMap(); |
| /** The map of sid --> Session timing record. */ |
| private static final HashMap uid2ttl = new HashMap(); |
| /** A synchronisation lock. */ |
| private static final Object lock = new Object(); |
| |
| /** Private constructor to enforce Singleton pattern. */ |
| private ClientStore() |
| { |
| super(); |
| |
| // TODO: add a cleaning timer thread |
| } |
| |
| /** |
| * Returns the classloader Singleton. |
| * |
| * @return the classloader Singleton instance. |
| */ |
| static synchronized final ClientStore instance() |
| { |
| if (singleton == null) |
| singleton = new ClientStore(); |
| return singleton; |
| } |
| |
| /** |
| * Returns a boolean flag indicating if the designated client's session is |
| * still alive or not. |
| * |
| * @param uid the identifier of the client whose session to check. |
| * @return <code>true</code> if the designated client's session is still |
| * alive. <code>false</code> otherwise. |
| */ |
| boolean isAlive(final String uid) |
| { |
| final boolean result; |
| synchronized (lock) |
| { |
| final Object obj = uid2ssc.get(uid); |
| result = (obj != null); |
| if (result) // is it still alive? |
| { |
| final StoreEntry sto = (StoreEntry) uid2ttl.get(uid); |
| if (! sto.isAlive()) // invalidate it |
| { |
| uid2ssc.remove(uid); |
| uid2ttl.remove(uid); |
| } |
| } |
| } |
| return result; |
| } |
| |
| /** |
| * Records a mapping between a client's unique identifier and its security |
| * context. |
| * |
| * @param uid the unique identifier of the SRP client for which the session is |
| * to be cached. |
| * @param ttl the session's Time-To-Live indicator (in seconds). |
| * @param ctx the client's security context. |
| */ |
| void cacheSession(final String uid, final int ttl, final SecurityContext ctx) |
| { |
| synchronized (lock) |
| { |
| uid2ssc.put(uid, ctx); |
| uid2ttl.put(uid, new StoreEntry(ttl)); |
| } |
| } |
| |
| /** |
| * Removes the mapping between the designated SRP client unique identifier and |
| * the its session security context (and other timing information). |
| * |
| * @param uid the identifier of the client whose session is to invalidate. |
| */ |
| void invalidateSession(final String uid) |
| { |
| synchronized (lock) |
| { |
| uid2ssc.remove(uid); |
| uid2ttl.remove(uid); |
| } |
| } |
| |
| /** |
| * Returns an SRP client's security context record mapped by that client's |
| * unique identifier. |
| * |
| * @param uid the identifier of the client whose session is to restore. |
| * @return the SRP client's security context. |
| */ |
| SecurityContext restoreSession(final String uid) |
| { |
| final SecurityContext result; |
| synchronized (lock) |
| { |
| result = (SecurityContext) uid2ssc.remove(uid); |
| uid2ttl.remove(uid); |
| } |
| return result; |
| } |
| } |