|
/*
|
|
* This program is a part of the IoTa Project.
|
|
*
|
|
* Copyright © 2011-2012 Université de Caen Basse-Normandie, GREYC
|
|
* Copyright © 2011 Orange Labs
|
|
*
|
|
* 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 3 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.
|
|
* <http://www.gnu.org/licenses/>
|
|
*
|
|
* See AUTHORS for a list of contributors.
|
|
*/
|
|
package fr.unicaen.iota.eta.user;
|
|
|
|
import java.io.UnsupportedEncodingException;
|
|
import java.math.BigInteger;
|
|
import java.security.MessageDigest;
|
|
import java.security.NoSuchAlgorithmException;
|
|
import java.util.ArrayList;
|
|
import java.util.Date;
|
|
import java.util.List;
|
|
import org.apache.commons.logging.Log;
|
|
import org.apache.commons.logging.LogFactory;
|
|
|
|
public final class Session {
|
|
|
|
private Session() {
|
|
}
|
|
private static final Log log = LogFactory.getLog(Session.class);
|
|
private static List<String> sessionIDList = new ArrayList<String>();
|
|
private static List<User> sessionUserList = new ArrayList<User>();
|
|
private static MessageDigest MD5;
|
|
|
|
static {
|
|
try {
|
|
MD5 = MessageDigest.getInstance("MD5");
|
|
} catch (NoSuchAlgorithmException e) {
|
|
log.fatal(null, e);
|
|
}
|
|
}
|
|
|
|
public static synchronized String openSession(User user) {
|
|
if (MD5 == null) {
|
|
log.fatal("MD5 not available");
|
|
return null;
|
|
}
|
|
log.info("opening session for user " + user);
|
|
String sessionID;
|
|
long today = new Date().getTime();
|
|
try {
|
|
do {
|
|
String text = Long.toString(today) + user.getUserID() + (today * Math.random()); // TODO add login+pass
|
|
byte[] digest = MD5.digest(text.getBytes("UTF-8"));
|
|
sessionID = new BigInteger(1, digest).toString(16);
|
|
} while (sessionIDList.contains(sessionID));
|
|
} catch (UnsupportedEncodingException e) {
|
|
log.error("An error occurred invoking MD5 algorithm", e);
|
|
return null;
|
|
}
|
|
sessionIDList.add(sessionID);
|
|
sessionUserList.add(user);
|
|
return sessionID;
|
|
}
|
|
|
|
public static synchronized boolean isValidSession(String sessionID) {
|
|
return sessionIDList.contains(sessionID);
|
|
}
|
|
|
|
public static synchronized void closeSession(String sessionID) {
|
|
log.info("closing session " + sessionID);
|
|
int index = sessionIDList.indexOf(sessionID);
|
|
sessionIDList.remove(sessionID);
|
|
sessionUserList.remove(index);
|
|
}
|
|
|
|
public static synchronized User getUser(String sessionID) {
|
|
int index = sessionIDList.indexOf(sessionID);
|
|
return sessionUserList.get(index);
|
|
}
|
|
}
|