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/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
*
* This library 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 library 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.
*
* For further information about Alkacon Software GmbH & Co. KG, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.main;
import org.opencms.configuration.CmsSystemConfiguration.UserSessionMode;
import org.opencms.db.CmsUserSettings;
import org.opencms.file.CmsObject;
import org.opencms.file.CmsProject;
import org.opencms.file.CmsRequestContext;
import org.opencms.file.CmsUser;
import org.opencms.security.CmsCustomLoginException;
import org.opencms.security.CmsRole;
import org.opencms.security.CmsSecurityException;
import org.opencms.ui.login.CmsLoginHelper;
import org.opencms.util.CmsRequestUtil;
import org.opencms.util.CmsStringUtil;
import org.opencms.util.CmsUUID;
import org.opencms.workplace.CmsWorkplaceManager;
import org.opencms.workplace.tools.CmsToolManager;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import org.apache.commons.collections.Buffer;
import org.apache.commons.collections.BufferUtils;
import org.apache.commons.collections.buffer.CircularFifoBuffer;
import org.apache.commons.logging.Log;
/**
* Keeps track of the sessions running on the OpenCms server and
* provides a session info storage which is used to get an overview
* about currently authenticated OpenCms users, as well as sending broadcasts between users.
*
* For each authenticated OpenCms user, a {@link org.opencms.main.CmsSessionInfo} object
* holds the information about the users status.
*
* When a user session is invalidated, the user info will be removed.
* This happens when a user log out, or when his session times out.
*
* Please Note: The current implementation does not provide any permission checking,
* so all users can access the methods of this manager. Permission checking
* based on the current users OpenCms context may be added in a future OpenCms release.
*
* @since 6.0.0
*/
public class CmsSessionManager {
/** The log object for this class. */
private static final Log LOG = CmsLog.getLog(CmsSessionManager.class);
/** Lock object for synchronized session count updates. */
private Object m_lockSessionCount;
/** Counter for the currently active sessions. */
private int m_sessionCountCurrent;
/** Counter for all sessions created so far. */
private int m_sessionCountTotal;
/** Session storage provider instance. */
private I_CmsSessionStorageProvider m_sessionStorageProvider;
/** The user session mode. */
private UserSessionMode m_userSessionMode;
/**
* Creates a new instance of the OpenCms session manager.
*/
protected CmsSessionManager() {
// create a lock object for the session counter
m_lockSessionCount = new Object();
}
/**
* Checks whether a new session can be created for the user, and throws an exception if not.
*
* @param user the user to check
* @throws CmsException if no new session for the user can't be created
*/
public void checkCreateSessionForUser(CmsUser user) throws CmsException {
if (getUserSessionMode() == UserSessionMode.single) {
List infos = getSessionInfos(user.getId());
if (!infos.isEmpty()) {
throw new CmsCustomLoginException(
org.opencms.security.Messages.get().container(
org.opencms.security.Messages.ERR_ALREADY_LOGGED_IN_0));
}
}
}
/**
* Returns the broadcast queue for the given OpenCms session id.
*
* @param sessionId the OpenCms session id to get the broadcast queue for
*
* @return the broadcast queue for the given OpenCms session id
*/
public Buffer getBroadcastQueue(String sessionId) {
CmsSessionInfo sessionInfo = getSessionInfo(getSessionUUID(sessionId));
if (sessionInfo == null) {
// return empty message buffer if the session is gone or not available
return BufferUtils.synchronizedBuffer(new CircularFifoBuffer(CmsSessionInfo.QUEUE_SIZE));
}
return sessionInfo.getBroadcastQueue();
}
/**
* Returns the number of sessions currently authenticated in the OpenCms security system.
*
* @return the number of sessions currently authenticated in the OpenCms security system
*/
public int getSessionCountAuthenticated() {
// since this method could be called from another thread
// we have to prevent access before initialization
if (m_sessionStorageProvider == null) {
return 0;
}
return m_sessionStorageProvider.getSize();
}
/**
* Returns the number of current sessions, including the sessions of not authenticated guest users.
*
* @return the number of current sessions, including the sessions of not authenticated guest users
*/
public int getSessionCountCurrent() {
return m_sessionCountCurrent;
}
/**
* Returns the number of total sessions generated so far, including already destroyed sessions.
*
* @return the number of total sessions generated so far, including already destroyed sessions
*/
public int getSessionCountTotal() {
return m_sessionCountTotal;
}
/**
* Returns the complete user session info of a user from the session storage,
* or null if this session id has no session info attached.
*
* @param sessionId the OpenCms session id to return the session info for
*
* @return the complete user session info of a user from the session storage
*/
public CmsSessionInfo getSessionInfo(CmsUUID sessionId) {
// since this method could be called from another thread
// we have to prevent access before initialization
if (m_sessionStorageProvider == null) {
return null;
}
return m_sessionStorageProvider.get(sessionId);
}
/**
* Returns the OpenCms user session info for the given request,
* or null if no user session is available.
*
* @param req the current request
*
* @return the OpenCms user session info for the given request, or null if no user session is available
*/
public CmsSessionInfo getSessionInfo(HttpServletRequest req) {
HttpSession session = req.getSession(false);
if (session == null) {
// special case for accessing a session from "outside" requests (e.g. upload applet)
String sessionId = req.getHeader(CmsRequestUtil.HEADER_JSESSIONID);
return sessionId == null ? null : getSessionInfo(sessionId);
}
return getSessionInfo(session);
}
/**
* Returns the OpenCms user session info for the given http session,
* or null if no user session is available.
*
* @param session the current http session
*
* @return the OpenCms user session info for the given http session, or null if no user session is available
*/
public CmsSessionInfo getSessionInfo(HttpSession session) {
if (session == null) {
return null;
}
CmsUUID sessionId = (CmsUUID)session.getAttribute(CmsSessionInfo.ATTRIBUTE_SESSION_ID);
return (sessionId == null) ? null : getSessionInfo(sessionId);
}
/**
* Returns the complete user session info of a user from the session storage,
* or null if this session id has no session info attached.
*
* @param sessionId the OpenCms session id to return the session info for,
* this must be a String representation of a {@link CmsUUID}
*
* @return the complete user session info of a user from the session storage
*
* @see #getSessionInfo(CmsUUID)
*/
public CmsSessionInfo getSessionInfo(String sessionId) {
return getSessionInfo(getSessionUUID(sessionId));
}
/**
* Returns all current session info objects.
*
* @return all current session info objects
*/
public List getSessionInfos() {
// since this method could be called from another thread
// we have to prevent access before initialization
if (m_sessionStorageProvider == null) {
return Collections.emptyList();
}
return m_sessionStorageProvider.getAll();
}
/**
* Returns a list of all active session info objects for the specified user.
*
* An OpenCms user can have many active sessions.
* This is e.g. possible when two people have logged in to the system using the
* same username. Even one person can have multiple sessions if he
* is logged in to OpenCms with several browser windows at the same time.
*
* @param userId the id of the user
*
* @return a list of all active session info objects for the specified user
*/
public List getSessionInfos(CmsUUID userId) {
// since this method could be called from another thread
// we have to prevent access before initialization
if (m_sessionStorageProvider == null) {
return Collections.emptyList();
}
return m_sessionStorageProvider.getAllOfUser(userId);
}
/**
* Gets the user session mode.
*
* @return the user session mode
*/
public UserSessionMode getUserSessionMode() {
return m_userSessionMode;
}
/**
* Kills all sessions for the given user.
*
* @param cms the current CMS context
* @param user the user for whom the sessions should be killed
*
* @throws CmsException if something goes wrong
*/
public void killSession(CmsObject cms, CmsUser user) throws CmsException {
OpenCms.getRoleManager().checkRole(cms, CmsRole.ACCOUNT_MANAGER);
List infos = getSessionInfos(user.getId());
for (CmsSessionInfo info : infos) {
m_sessionStorageProvider.remove(info.getSessionId());
}
}
/**
* Destroys a session given the session id. Only allowed for users which have the "account manager" role.
*
* @param cms the current CMS context
* @param sessionid the session id
*
* @throws CmsException if something goes wrong
*/
public void killSession(CmsObject cms, CmsUUID sessionid) throws CmsException {
OpenCms.getRoleManager().checkRole(cms, CmsRole.ACCOUNT_MANAGER);
m_sessionStorageProvider.remove(sessionid);
}
/**
* Sends a broadcast to all sessions of all currently authenticated users.
*
* @param cms the OpenCms user context of the user sending the broadcast
*
* @param message the message to broadcast
*/
public void sendBroadcast(CmsObject cms, String message) {
if (CmsStringUtil.isEmptyOrWhitespaceOnly(message)) {
// don't broadcast empty messages
return;
}
// create the broadcast
CmsBroadcast broadcast = new CmsBroadcast(cms.getRequestContext().getCurrentUser(), message);
// send the broadcast to all authenticated sessions
Iterator i = m_sessionStorageProvider.getAll().iterator();
while (i.hasNext()) {
CmsSessionInfo sessionInfo = i.next();
if (m_sessionStorageProvider.get(sessionInfo.getSessionId()) != null) {
// double check for concurrent modification
sessionInfo.getBroadcastQueue().add(broadcast);
}
}
}
/**
* Sends a broadcast to the specified user session.
*
* @param cms the OpenCms user context of the user sending the broadcast
*
* @param message the message to broadcast
* @param sessionId the OpenCms session uuid target (receiver) of the broadcast
*/
public void sendBroadcast(CmsObject cms, String message, String sessionId) {
if (CmsStringUtil.isEmptyOrWhitespaceOnly(message)) {
// don't broadcast empty messages
return;
}
// send the broadcast only to the selected session
CmsSessionInfo sessionInfo = m_sessionStorageProvider.get(new CmsUUID(sessionId));
if (sessionInfo != null) {
// double check for concurrent modification
sessionInfo.getBroadcastQueue().add(new CmsBroadcast(cms.getRequestContext().getCurrentUser(), message));
}
}
/**
* Sends a broadcast to all sessions of a given user.
*
* The user sending the message may be a real user like
* cms.getRequestContext().currentUser() or
* null for a system message.
*
* @param fromUser the user sending the broadcast
* @param message the message to broadcast
* @param toUser the target (receiver) of the broadcast
*/
public void sendBroadcast(CmsUser fromUser, String message, CmsUser toUser) {
if (CmsStringUtil.isEmptyOrWhitespaceOnly(message)) {
// don't broadcast empty messages
return;
}
// create the broadcast
CmsBroadcast broadcast = new CmsBroadcast(fromUser, message);
List userSessions = getSessionInfos(toUser.getId());
Iterator i = userSessions.iterator();
// send the broadcast to all sessions of the selected user
while (i.hasNext()) {
CmsSessionInfo sessionInfo = i.next();
if (m_sessionStorageProvider.get(sessionInfo.getSessionId()) != null) {
// double check for concurrent modification
sessionInfo.getBroadcastQueue().add(broadcast);
}
}
}
/**
* Switches the current user to the given user. The session info is rebuild as if the given user
* performs a login at the workplace.
*
* @param cms the current CmsObject
* @param req the current request
* @param user the user to switch to
*
* @return the direct edit target if available
*
* @throws CmsException if something goes wrong
*/
public String switchUser(CmsObject cms, HttpServletRequest req, CmsUser user) throws CmsException {
// only user with root administrator role are allowed to switch the user
OpenCms.getRoleManager().checkRole(cms, CmsRole.ADMINISTRATOR.forOrgUnit(user.getOuFqn()));
CmsSessionInfo info = getSessionInfo(req);
HttpSession session = req.getSession(false);
if ((info == null) || (session == null)) {
throw new CmsException(Messages.get().container(Messages.ERR_NO_SESSIONINFO_SESSION_0));
}
if (!OpenCms.getRoleManager().hasRole(cms, user.getName(), CmsRole.ELEMENT_AUTHOR)) {
throw new CmsSecurityException(Messages.get().container(Messages.ERR_NO_WORKPLACE_PERMISSIONS_0));
}
// get the user settings for the given user and set the start project and the site root
CmsUserSettings settings = new CmsUserSettings(user);
String ouFqn = user.getOuFqn();
CmsProject userProject = cms.readProject(
ouFqn + OpenCms.getWorkplaceManager().getDefaultUserSettings().getStartProject());
try {
userProject = cms.readProject(settings.getStartProject());
} catch (Exception e) {
// ignore, use default
}
String userSiteRoot = settings.getStartSite();
CmsRequestContext context = new CmsRequestContext(
user,
userProject,
null,
cms.getRequestContext().getRequestMatcher(),
userSiteRoot,
cms.getRequestContext().isSecureRequest(),
null,
null,
null,
0,
null,
null,
ouFqn);
// delete the stored workplace settings, so the session has to receive them again
session.removeAttribute(CmsWorkplaceManager.SESSION_WORKPLACE_SETTINGS);
// create a new CmsSessionInfo and store it inside the session map
CmsSessionInfo newInfo = new CmsSessionInfo(context, info.getSessionId(), info.getMaxInactiveInterval());
addSessionInfo(newInfo);
// set the site root, project and ou fqn to current cms context
cms.getRequestContext().setSiteRoot(userSiteRoot);
cms.getRequestContext().setCurrentProject(userProject);
cms.getRequestContext().setOuFqn(user.getOuFqn());
String directEditTarget = CmsLoginHelper.getDirectEditPath(cms, new CmsUserSettings(user), false);
return directEditTarget != null
? OpenCms.getLinkManager().substituteLink(cms, directEditTarget, userSiteRoot)
: null;
}
/**
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
StringBuffer output = new StringBuffer();
Iterator i = m_sessionStorageProvider.getAll().iterator();
output.append("[CmsSessions]:\n");
while (i.hasNext()) {
CmsSessionInfo sessionInfo = i.next();
output.append(sessionInfo.getSessionId().toString());
output.append(" : ");
output.append(sessionInfo.getUserId().toString());
output.append('\n');
}
return output.toString();
}
/**
* Updates the the OpenCms session data used for quick authentication of users.
*
* This is required if the user data (current group or project) was changed in
* the requested document.
*
* The user data is only updated if the user was authenticated to the system.
*
* @param cms the current OpenCms user context
* @param req the current request
*/
public void updateSessionInfo(CmsObject cms, HttpServletRequest req) {
if (!cms.getRequestContext().isUpdateSessionEnabled()) {
// this request must not update the user session info
// this is true for long running "thread" requests, e.g. during project publish
return;
}
if (cms.getRequestContext().getUri().equals(CmsToolManager.VIEW_JSPPAGE_LOCATION)) {
// this request must not update the user session info
// if not the switch user feature would not work
return;
}
if (!cms.getRequestContext().getCurrentUser().isGuestUser()) {
// Guest user requests don't need to update the OpenCms user session information
// get the session info object for the user
CmsSessionInfo sessionInfo = getSessionInfo(req);
if (sessionInfo != null) {
// update the users session information
sessionInfo.update(cms.getRequestContext());
addSessionInfo(sessionInfo);
} else {
HttpSession session = req.getSession(false);
// only create session info if a session is already available
if (session != null) {
// create a new session info for the user
sessionInfo = new CmsSessionInfo(
cms.getRequestContext(),
new CmsUUID(),
session.getMaxInactiveInterval());
// append the session info to the http session
session.setAttribute(CmsSessionInfo.ATTRIBUTE_SESSION_ID, sessionInfo.getSessionId().clone());
// update the session info user data
addSessionInfo(sessionInfo);
}
}
}
}
/**
* Updates the the OpenCms session data used for quick authentication of users.
*
* This is required if the user data (current group or project) was changed in
* the requested document.
*
* The user data is only updated if the user was authenticated to the system.
*
* @param cms the current OpenCms user context
* @param session the current session
*/
public void updateSessionInfo(CmsObject cms, HttpSession session) {
if (session == null) {
return;
}
if (!cms.getRequestContext().isUpdateSessionEnabled()) {
// this request must not update the user session info
// this is true for long running "thread" requests, e.g. during project publish
return;
}
if (cms.getRequestContext().getUri().equals(CmsToolManager.VIEW_JSPPAGE_LOCATION)) {
// this request must not update the user session info
// if not the switch user feature would not work
return;
}
if (!cms.getRequestContext().getCurrentUser().isGuestUser()) {
// Guest user requests don't need to update the OpenCms user session information
// get the session info object for the user
CmsSessionInfo sessionInfo = getSessionInfo(session);
if (sessionInfo != null) {
// update the users session information
sessionInfo.update(cms.getRequestContext());
addSessionInfo(sessionInfo);
} else {
sessionInfo = new CmsSessionInfo(
cms.getRequestContext(),
new CmsUUID(),
session.getMaxInactiveInterval());
// append the session info to the http session
session.setAttribute(CmsSessionInfo.ATTRIBUTE_SESSION_ID, sessionInfo.getSessionId().clone());
// update the session info user data
addSessionInfo(sessionInfo);
}
}
}
/**
* Updates all session info objects, so that invalid projects
* are replaced by the Online project.
*
* @param cms the cms context
*/
public void updateSessionInfos(CmsObject cms) {
// get all sessions
List userSessions = getSessionInfos();
Iterator i = userSessions.iterator();
while (i.hasNext()) {
CmsSessionInfo sessionInfo = i.next();
// check is the project stored in this session is not existing anymore
// if so, set it to the online project
CmsUUID projectId = sessionInfo.getProject();
try {
cms.readProject(projectId);
} catch (CmsException e) {
// the project does not longer exist, update the project information with the online project
sessionInfo.setProject(CmsProject.ONLINE_PROJECT_ID);
addSessionInfo(sessionInfo);
}
}
}
/**
* Adds a new session info into the session storage.
*
* @param sessionInfo the session info to store for the id
*/
protected void addSessionInfo(CmsSessionInfo sessionInfo) {
if (getUserSessionMode() == UserSessionMode.standard) {
m_sessionStorageProvider.put(sessionInfo);
} else if (getUserSessionMode() == UserSessionMode.single) {
CmsUUID userId = sessionInfo.getUserId();
List infos = getSessionInfos(userId);
if (infos.isEmpty()
|| ((infos.size() == 1) && infos.get(0).getSessionId().equals(sessionInfo.getSessionId()))) {
m_sessionStorageProvider.put(sessionInfo);
} else {
throw new RuntimeException("Can't create another session for the same user.");
}
}
}
/**
* Returns the UUID representation for the given session id String.
*
* @param sessionId the session id String to return the UUID representation for
*
* @return the UUID representation for the given session id String
*/
protected CmsUUID getSessionUUID(String sessionId) {
return new CmsUUID(sessionId);
}
/**
* Sets the storage provider.
*
* @param sessionStorageProvider the storage provider implementation
*/
protected void initialize(I_CmsSessionStorageProvider sessionStorageProvider) {
m_sessionStorageProvider = sessionStorageProvider;
m_sessionStorageProvider.initialize();
}
/**
* Called by the {@link OpenCmsListener} when a http session is created.
*
* @param event the http session event
*
* @see javax.servlet.http.HttpSessionListener#sessionCreated(javax.servlet.http.HttpSessionEvent)
* @see OpenCmsListener#sessionCreated(HttpSessionEvent)
*/
protected void sessionCreated(HttpSessionEvent event) {
HttpServletRequest request = OpenCmsServlet.currentRequest.get();
String tid = "[" + Thread.currentThread().getId() + "] ";
synchronized (m_lockSessionCount) {
m_sessionCountCurrent = (m_sessionCountCurrent <= 0) ? 1 : (m_sessionCountCurrent + 1);
m_sessionCountTotal++;
if (LOG.isInfoEnabled()) {
LOG.info(tid
+ Messages.get().getBundle().key(
Messages.LOG_SESSION_CREATED_2,
new Integer(m_sessionCountTotal),
new Integer(m_sessionCountCurrent)));
}
}
if (LOG.isDebugEnabled()) {
LOG.debug(tid + Messages.get().getBundle().key(Messages.LOG_SESSION_CREATED_1, event.getSession().getId()));
if (request != null) {
LOG.debug(tid + "Session created in request: " + request.getRequestURL());
}
StringWriter sw = new StringWriter();
new Throwable("").printStackTrace(new PrintWriter(sw));
String stackTrace = sw.toString();
LOG.debug(tid + "Stack = \n" + stackTrace);
}
}
/**
* Called by the {@link OpenCmsListener} when a http session is destroyed.
*
* @param event the http session event
*
* @see javax.servlet.http.HttpSessionListener#sessionDestroyed(javax.servlet.http.HttpSessionEvent)
* @see OpenCmsListener#sessionDestroyed(HttpSessionEvent)
*/
protected void sessionDestroyed(HttpSessionEvent event) {
synchronized (m_lockSessionCount) {
m_sessionCountCurrent = (m_sessionCountCurrent <= 0) ? 0 : (m_sessionCountCurrent - 1);
if (LOG.isInfoEnabled()) {
LOG.info(
Messages.get().getBundle().key(
Messages.LOG_SESSION_DESTROYED_2,
new Integer(m_sessionCountTotal),
new Integer(m_sessionCountCurrent)));
}
}
CmsSessionInfo sessionInfo = getSessionInfo(event.getSession());
CmsUUID userId = null;
if (sessionInfo != null) {
userId = sessionInfo.getUserId();
m_sessionStorageProvider.remove(sessionInfo.getSessionId());
}
if ((userId != null) && (getSessionInfos(userId).size() == 0)) {
// remove the temporary locks of this user from memory
OpenCmsCore.getInstance().getLockManager().removeTempLocks(userId);
}
HttpSession session = event.getSession();
Enumeration attrNames = session.getAttributeNames();
while (attrNames.hasMoreElements()) {
String attrName = (String)attrNames.nextElement();
Object attribute = session.getAttribute(attrName);
if (attribute instanceof I_CmsSessionDestroyHandler) {
try {
((I_CmsSessionDestroyHandler)attribute).onSessionDestroyed();
} catch (Exception e) {
LOG.error(e.getLocalizedMessage(), e);
}
}
}
if (LOG.isDebugEnabled()) {
LOG.debug(Messages.get().getBundle().key(Messages.LOG_SESSION_DESTROYED_1, event.getSession().getId()));
}
}
/**
* Sets the user session mode.
*
* @param userSessionMode the user session mode
*/
protected void setUserSessionMode(UserSessionMode userSessionMode) {
m_userSessionMode = userSessionMode;
}
/**
* Removes all stored session info objects.
*
* @throws Exception if something goes wrong
*/
protected void shutdown() throws Exception {
if (m_sessionStorageProvider != null) {
m_sessionStorageProvider.shutdown();
}
}
/**
* Validates the sessions stored in this manager and removes
* any sessions that have become invalidated.
*/
protected void validateSessionInfos() {
// since this method could be called from another thread
// we have to prevent access before initialization
if (m_sessionStorageProvider == null) {
return;
}
m_sessionStorageProvider.validate();
}
}