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/**
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* '$RCSfile$'
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* Purpose: A Class that implements session utility methods
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* Copyright: 2008 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Michael Daigle
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*
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* '$Author: leinfelder $'
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* '$Date: 2010-08-19 17:03:20 -0700 (Thu, 19 Aug 2010) $'
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* '$Revision: 5505 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat.service;
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import java.io.PrintWriter;
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import java.util.Calendar;
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import java.util.Enumeration;
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import java.util.Hashtable;
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import javax.servlet.http.HttpServletResponse;
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import org.apache.log4j.Logger;
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import edu.ucsb.nceas.metacat.properties.PropertyService;
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import edu.ucsb.nceas.metacat.shared.BaseService;
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import edu.ucsb.nceas.metacat.shared.ServiceException;
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import edu.ucsb.nceas.metacat.util.SessionData;
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import edu.ucsb.nceas.utilities.PropertyNotFoundException;
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public class SessionService extends BaseService {
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private static SessionService sessionService = null;
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private static int sessionTimeoutMinutes;
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private static Logger logMetacat = Logger.getLogger(SessionService.class);
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private static Hashtable<String, SessionData> sessionHash = null;
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private static final String PUBLIC_SESSION_ID = "0";
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private static Object lockObj = new Object();
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/**
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* private constructor since this is a singleton
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*/
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private SessionService() throws ServiceException {
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_serviceName = "SessionService";
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String sessionTimeoutStr = null;
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try {
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sessionHash = new Hashtable<String, SessionData>();
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sessionTimeoutStr = PropertyService.getProperty("session.timeoutMinutes");
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sessionTimeoutMinutes = Integer.parseInt(sessionTimeoutStr);
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logMetacat.debug("SessionService() - Registering public session id: " +
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PUBLIC_SESSION_ID);
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registerSession(PUBLIC_SESSION_ID, "public", null, null, "Public User");
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} catch (PropertyNotFoundException pnfe) {
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throw new ServiceException("SessionService() - Error getting property: " +
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pnfe.getMessage());
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} catch (NumberFormatException nfe) {
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throw new ServiceException("SessionService() - Error parsing session timeout minutes: " +
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sessionTimeoutStr);
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}
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}
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/**
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* Get the single instance of SessionService.
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*
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* @return the single instance of SessionService
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*/
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public static SessionService getInstance() {
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try
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{
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if (sessionService == null) {
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sessionService = new SessionService();
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}
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return sessionService;
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}
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catch(ServiceException se)
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{
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logMetacat.error("SessionService.getInstance - could not get " +
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"an instance of SessionService: " + se.getMessage());
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}
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return null;
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}
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public boolean refreshable() {
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return false;
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}
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public void doRefresh() throws ServiceException {
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return;
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}
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public void stop() throws ServiceException {
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return;
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}
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/**
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* Register a session in the session hash table. This uses
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* the parameters passed in to create a SessionData object.
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*
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* @param sessionId
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* the ID of the session to register
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* @param userName
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* the user name of the session
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* @param groupNames
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* the group names for the session
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* @param password
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* the password for the session
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*/
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public void registerSession(String sessionId, String userName,
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String[] groupNames, String password, String name) throws ServiceException {
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synchronized(lockObj) {
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if (sessionId == null) {
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throw new ServiceException("SessionService.registerSession - " +
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"Cannot register a null session id");
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}
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logMetacat.debug("SessionService.registerSession - Registering session id: " + sessionId);
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SessionData sessionData = new SessionData(sessionId, userName, groupNames,
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password, name);
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sessionHash.put(sessionId, sessionData);
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}
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}
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/**
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* Register a session in the session hash table.
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*
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* @param sessionData
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* the session data object to add to the session hash
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*/
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public void registerSession(SessionData sessionData) throws ServiceException {
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synchronized(lockObj) {
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if (sessionData == null) {
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throw new ServiceException("SessionService.registerSession - " +
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"Cannot register null session data");
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}
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logMetacat.debug("SessionService.registerSession - Registering session " +
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"data with id: " + sessionData.getId());
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sessionHash.put(sessionData.getId(), sessionData);
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}
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}
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/**
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* Unregister a session from the session hash table.
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*
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* @param sessionId
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* the id of the session to remove.
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*/
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public void unRegisterSession(String sessionId) {
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synchronized(lockObj) {
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if (sessionId == null) {
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logMetacat.error("SessionService.unRegisterSession - trying to " +
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"unregister a session with null id");
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return;
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}
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if (sessionId.equals(PUBLIC_SESSION_ID)) {
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logMetacat.error("SessionService.unRegisterSession - cannot unregister public session, " +
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"sessionId=" + sessionId);
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return;
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}
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logMetacat.info("SessionService.unRegisterSession - unRegistering session: " + sessionId);
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sessionHash.remove(sessionId);
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}
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}
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/**
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* Unregister all sessions from the session hash table except the public session.
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*
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* @param sessionId
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* the id of the session to remove.
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*/
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public void unRegisterAllSessions() {
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synchronized(lockObj) {
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Enumeration<String> keyEnum = sessionHash.keys();
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while (keyEnum.hasMoreElements()) {
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String sessionId = keyEnum.nextElement();
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if (!sessionId.equals(PUBLIC_SESSION_ID)) {
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logMetacat.info("SessionService.unRegisterAllSessions - unRegistering session: " + sessionId);
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sessionHash.remove(sessionId);
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}
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}
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}
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}
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/**
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* Check if a session is registered in the session hash table.
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*
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* @param sessionId
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* the id of the session to look for.
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*/
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public boolean isSessionRegistered(String sessionId) {
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if (sessionId == null) {
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logMetacat.error("SessionService.isSessionRegistered - trying to check if a " +
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"session with null id is registered");
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return false;
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}
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checkTimeout(sessionId);
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return sessionHash.containsKey(sessionId);
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}
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/**
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* Check if a session is registered in the session hash table. Write results
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* in XML format to output.
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*
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* @param out
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* the output stream to write to.
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* @param sessionId
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* the id of the session to look for.
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*/
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public void validateSession(PrintWriter out, HttpServletResponse response,
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String sessionId) {
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response.setContentType("text/xml");
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out.println("<?xml version=\"1.0\"?>");
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out.write("<validateSession><status>");
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if (validateSession(sessionId)) {
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out.write("valid");
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} else {
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out.write("invalid");
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}
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out.write("</status>");
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out.write("<sessionId>" + sessionId + "</sessionId></validateSession>");
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}
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/**
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* Check if a session is registered in the session hash table. Return
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* true if the session is valid and false otherwise.
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*
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* @param sessionId
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* the id of the session to look for.
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*/
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public boolean validateSession(String sessionId) {
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if (sessionId != null && !sessionId.equals(PUBLIC_SESSION_ID) && isSessionRegistered(sessionId)) {
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return true;
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} else {
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return false;
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}
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}
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/**
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* Get a registered session from the session hash table.
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* TODO MCD need to time sessions out
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*
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* @param sessionId
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* the id of the session to retrieve.
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*/
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public SessionData getRegisteredSession(String sessionId) {
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if (sessionId == null) {
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logMetacat.error("SessionService.getRegisteredSession - trying to get a session with null id");
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return null;
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}
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checkTimeout(sessionId);
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return sessionHash.get(sessionId);
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}
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/**
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* Get the public session from the session hash table.
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*/
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public SessionData getPublicSession() {
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return sessionHash.get(PUBLIC_SESSION_ID);
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}
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/**
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* Keep a session active by updating its last accessed time.
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*
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* @param sessionId
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* the id of the session to update.
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*/
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public synchronized void touchSession(String sessionId) {
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if (sessionId == null) {
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logMetacat.error("SessionService.touchSession - trying to touch a session with null id");
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} else if (isSessionRegistered(sessionId)) {
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synchronized(lockObj) {
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SessionData sessionData = getRegisteredSession(sessionId);
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sessionData.setLastAccessedTime();
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}
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}
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}
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private void checkTimeout (String sessionId) {
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SessionData sessionData = null;
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if ((sessionData = sessionHash.get(sessionId)) != null) {
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Calendar expireTime = Calendar.getInstance();
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Calendar lastAccessedTime = sessionData.getLastAccessedTime();
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expireTime.add(Calendar.MINUTE, 0 - sessionTimeoutMinutes);
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if(lastAccessedTime.compareTo(expireTime) < 0 ) {
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unRegisterSession(sessionId);
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}
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}
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}
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}
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