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Jetspeed-2 Portal Components
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jetspeed.engine;
import java.io.File;
import java.io.IOException;
import java.security.Principal;
import java.util.Properties;
import javax.security.auth.Subject;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationUtils;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.lang.exception.ExceptionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.jetspeed.Jetspeed;
import org.apache.jetspeed.PortalReservedParameters;
import org.apache.jetspeed.cache.UserContentCacheManager;
import org.apache.jetspeed.components.ComponentManager;
import org.apache.jetspeed.components.JetspeedBeanDefinitionFilter;
import org.apache.jetspeed.components.SpringComponentManager;
import org.apache.jetspeed.components.factorybeans.ServletConfigFactoryBean;
import org.apache.jetspeed.container.session.PortalSessionsManager;
import org.apache.jetspeed.engine.servlet.ServletHelper;
import org.apache.jetspeed.exception.JetspeedException;
import org.apache.jetspeed.pipeline.valve.SecurityValve;
import org.apache.jetspeed.request.RequestContext;
import org.apache.jetspeed.request.RequestContextComponent;
import org.apache.jetspeed.request.RequestDiagnostics;
import org.apache.jetspeed.request.RequestDiagnosticsFactory;
import org.apache.jetspeed.request.RequestDiagnosticsHolder;
import org.apache.jetspeed.security.SubjectHelper;
import org.apache.jetspeed.security.UserSubjectPrincipal;
import org.apache.jetspeed.services.JetspeedPortletServices;
import org.apache.jetspeed.services.PortletServices;
import org.apache.jetspeed.statistics.PortalStatistics;
/**
* Jetspeed Servlet entry point.
*
* @author David Sean Taylor
* @version $Id: JetspeedServlet.java 772479 2009-05-07 00:43:28Z ate $
*/
public class JetspeedServlet extends HttpServlet implements JetspeedEngineConstants, HttpSessionListener
{
private static Logger log;
private static Logger console;
/**
* In certain situations the init() method is called more than once,
* somtimes even concurrently. This causes bad things to happen, so we use
* this flag to prevent it.
*/
private static boolean firstInit = true;
/**
* Whether init succeeded or not.
*/
private static Throwable initFailure = null;
/**
* Should initialization activities be performed during doGet() execution?
*/
private static boolean firstDoGet = true;
/**
* The servlet init parameter name providing the portal url path mapped to a error handler servlet/jsp
* for handling request processing exceptions thrown.
*/
private static final String ERROR_HANDLER_PATH_PARM = "errorHandlerPath";
/**
* The default portal url path used as error handler servlet/jsp when the ERROR_HANDLER_PATH_PARAM
* servlet init parameter isn't configured
*/
private static final String DEFAULT_ERROR_HANDLER_PATH = "/diagnostics";
/**
* The Jetspeed Engine
*/
private static Engine engine;
private static RequestContextComponent contextComponent;
private static String webappRoot;
// -------------------------------------------------------------------
// I N I T I A L I Z A T I O N
// -------------------------------------------------------------------
private static final String INIT_START_MSG = "Jetspeed Starting Initialization...";
private static final String INIT_DONE_MSG = "Jetspeed Initialization complete, Ready to service requests.";
/**
* Intialize Servlet.
*/
public final void init( ServletConfig config ) throws ServletException
{
synchronized (this.getClass())
{
if ( log == null )
{
log = LoggerFactory.getLogger(JetspeedServlet.class);
console = LoggerFactory.getLogger(CONSOLE_LOGGER);
}
console.info(INIT_START_MSG);
super.init(config);
if (!firstInit)
{
log.info("Double initialization of Jetspeed was attempted!");
console.info("Double initialization of Jetspeed was attempted!");
return;
}
// executing init will trigger some static initializers, so we have
// only one chance.
firstInit = false;
try
{
ServletContext context = config.getServletContext();
String propertiesFilename = ServletHelper.findInitParameter(context, config, JETSPEED_PROPERTIES_KEY,
JETSPEED_PROPERTIES_DEFAULT);
String applicationRoot = ServletHelper.findInitParameter(context, config, APPLICATION_ROOT_KEY,
APPLICATION_ROOT_DEFAULT);
console.info("JetspeedServlet identifying web application root...");
webappRoot = config.getServletContext().getRealPath("/");
console.info("JetspeedServlet identifed web application root as " + webappRoot);
if (applicationRoot == null || applicationRoot.equals(WEB_CONTEXT))
{
applicationRoot = webappRoot;
}
// Using \ characters will corrupt the path when used as (Spring expanded) variables
// making sure default (Java) path separators are used which somehow always work, even on Windows platform.
applicationRoot = applicationRoot.replace('\\', '/');
// load jetspeed.properties, override.properties and spring-filter-key.properties separately
// and "merge" them by hand instead of relaying on Commons Configuration "include" functionality...
// Commons Configuration performs property value *appending* if keys are encountered multiple times,
// thereby *not* resulting in the proper override functionality we need.
PropertiesConfiguration properties = new PropertiesConfiguration();
File propsFile = new File(ServletHelper.getRealPath(config, propertiesFilename));
if (!propsFile.isFile())
{
throw new IOException("Jetspeed properties not found: "+propsFile.getAbsolutePath());
}
File jetspeedPropertiesPath = propsFile.getParentFile();
properties.load(propsFile);
propsFile = new File(jetspeedPropertiesPath,OVERRIDE_PROPERTIES);
if (propsFile.exists())
{
PropertiesConfiguration extraProps = new PropertiesConfiguration();
extraProps.load(propsFile);
ConfigurationUtils.copy(extraProps,properties);
}
propsFile = new File(jetspeedPropertiesPath,SPRING_FILTER_KEY_PROPERTIES);
if (propsFile.exists())
{
PropertiesConfiguration extraProps = new PropertiesConfiguration();
extraProps.load(propsFile);
Object springFilterKey = extraProps.getProperty(SPRING_FILTER_KEY);
if (springFilterKey != null)
{
properties.setProperty(SPRING_FILTER_KEY, springFilterKey);
}
}
properties.setProperty(APPLICATION_ROOT_KEY, applicationRoot);
properties.setProperty(WEBAPP_ROOT_KEY, webappRoot);
properties.setProperty(JETSPEED_PROPERTIES_PATH_KEY, jetspeedPropertiesPath.getAbsolutePath());
console.info("JetspeedServlet attempting to create the portlet engine...");
engine = new JetspeedEngine(properties, applicationRoot, config, initializeComponentManager(config, applicationRoot, properties));
console.info("JetspeedServlet attempting to start the Jetspeed Portal Engine...");
Jetspeed.setEngine(engine);
engine.start();
console.info("JetspeedServlet has successfuly started the Jetspeed Portal Engine....");
contextComponent = (RequestContextComponent) Jetspeed.getComponentManager().getComponent(RequestContextComponent.class);
}
catch (Throwable e)
{
// save the exception to complain loudly later :-)
final String msg = "Jetspeed: init() failed: ";
initFailure = e;
log.error(msg, e);
console.error(msg, e);
}
console.info(INIT_DONE_MSG);
log.info(INIT_DONE_MSG);
}
}
/**
* Initializes the services which need RunData to initialize
* themselves (post startup).
*
* @param data
* The first GET request.
*/
public final void init( HttpServletRequest request, HttpServletResponse response )
{
synchronized (JetspeedServlet.class)
{
if (firstDoGet)
{
// initialize the Portal context path
engine.getContext().setContextPath(request.getContextPath());
// Mark that we're done.
firstDoGet = false;
}
}
}
// -------------------------------------------------------------------
// R E Q U E S T P R O C E S S I N G
// -------------------------------------------------------------------
/**
* The primary method invoked when the Jetspeed servlet is executed.
*
* @param req
* Servlet request.
* @param res
* Servlet response.
* @exception IOException
* a servlet exception.
* @exception ServletException
* a servlet exception.
*/
public final void doGet( HttpServletRequest req, HttpServletResponse res ) throws IOException, ServletException
{
// define RequestContext here to allow protential usage and state processing in case of an exception
// in outer catch errorHandler method call
RequestContext context = null;
try
{
cleanupError(req);
// Check to make sure that we started up properly.
if (initFailure != null)
{
throw new ServletException("Failed to initalize jetspeed. "+initFailure.toString(), initFailure);
}
// If this is the first invocation, perform some late
// initialization.
if (firstDoGet)
{
init(req, res);
}
//If we already passed though the content filter DON'T send it to the
// engine. This is a crappy hack until we find a better solution.
String wasFiltered = (String) req.getAttribute("org.apache.jetspeed.content.filtered");
if (wasFiltered == null || !wasFiltered.equals("true"))
{
// ensure that no proxy or brower caching is performed
// on dynamic responses resulting from pipeline execution
res.setHeader("Cache-Control", "no-cache,no-store,private"); // HTTP/1.1 modern browser/proxy
res.setHeader("Pragma", "no-cache"); // HTTP/1.0 non-standard proxy
res.setHeader("Expires", "0"); // HTTP/1.0 browser/proxy
// send request through pipeline
try
{
context = contextComponent.create(req, res, getServletConfig());
engine.service(context);
}
finally
{
contextComponent.setRequestContext(null);
}
}
}
catch (Throwable e)
{
handleError(req, res, context, e);
}
}
/**
* In this application doGet and doPost are the same thing.
*
* @param req
* Servlet request.
* @param res
* Servlet response.
* @exception IOException
* a servlet exception.
* @exception ServletException
* a servlet exception.
*/
public final void doPost( HttpServletRequest req, HttpServletResponse res ) throws IOException, ServletException
{
doGet(req, res);
}
// -------------------------------------------------------------------
// S E R V L E T S H U T D O W N
// -------------------------------------------------------------------
/**
* The Servlet destroy method. Invokes
* ServiceBroker tear down method.
*/
public final void destroy()
{
try
{
Jetspeed.shutdown();
}
catch (JetspeedException e)
{
log.error("Jetspeed: shutdown() failed: ", e);
System.err.println(ExceptionUtils.getStackTrace(e));
}
// Allow turbine to be started back up again.
firstInit = true;
log.info("Done shutting down!");
}
/**
* If you prefer to use a component manager other than Spring, you
* can override this method to do so. Do not explicitly call start()
* of the ComponentManager as the JetspeedEngine will do this within its
* own start() method.
*
* @param servletConfig
* @param appRoot
* @param configuration
* @return
* @throws IOException
*/
protected ComponentManager initializeComponentManager(ServletConfig servletConfig, String appRoot, Configuration configuration) throws IOException
{
ServletConfigFactoryBean.setServletConfig(servletConfig);
final String assemblyDir = configuration.getString("assembly.dir","/WEB-INF/assembly");
final String assemblyFileExtension = configuration.getString("assembly.extension",".xml");
String springFilterKey = configuration.getString(SPRING_FILTER_KEY, SPRING_FILTER_KEY_DEFAULT);
File springFilterProperties = new File(configuration.getString(JETSPEED_PROPERTIES_PATH_KEY), SPRING_FILTER_PROPERTIES);
if (!springFilterProperties.isFile())
{
throw new IOException("Spring filter properties not found: "+springFilterProperties.getAbsolutePath());
}
String[] bootConfigs = new String[] {"/WEB-INF/assembly/boot/*.xml"};
String[] appConfigs = new String[] {assemblyDir+"/*"+assemblyFileExtension, assemblyDir+"/override/*"+assemblyFileExtension};
ServletContext servletContext = servletConfig.getServletContext();
JetspeedBeanDefinitionFilter filter = new JetspeedBeanDefinitionFilter("file:"+springFilterProperties.getAbsolutePath(), springFilterKey);
Properties initProperties = new Properties();
initProperties.put(JETSPEED_PROPERTIES_PATH_KEY, configuration.getString(JETSPEED_PROPERTIES_PATH_KEY));
SpringComponentManager cm = new SpringComponentManager(filter, bootConfigs, appConfigs, servletContext, appRoot, initProperties);
return cm;
}
public void sessionCreated(HttpSessionEvent se)
{
PortletServices services = JetspeedPortletServices.getSingleton();
if (services != null)
{
PortalSessionsManager psm = (PortalSessionsManager)services.getService(PortalSessionsManager.SERVICE_NAME);
if (psm != null)
{
psm.portalSessionCreated(se.getSession());
}
}
}
public void sessionDestroyed(HttpSessionEvent se)
{
Subject subject = (Subject)se.getSession().getAttribute(PortalReservedParameters.SESSION_KEY_SUBJECT);
if (subject == null)
return;
if (firstInit)
{
// Servlet already destroyed,
// Can't reliably access ComponentManager (Spring) anymore
// as for instance WAS 6.0.2 has a bug invoking this method with a wrong classLoader (not the one for the WebApp)
return;
}
Principal subjectUserPrincipal = SubjectHelper.getPrincipal(subject, UserSubjectPrincipal.class);
PortalStatistics statistics = (PortalStatistics)engine.getComponentManager().getComponent("PortalStatistics");
long sessionLength = System.currentTimeMillis() - se.getSession().getCreationTime();
String ipAddress = (String)se.getSession().getAttribute(SecurityValve.IP_ADDRESS);
statistics.logUserLogout(ipAddress, subjectUserPrincipal.getName(), sessionLength);
UserContentCacheManager userContentCacheManager = (UserContentCacheManager)engine.getComponentManager().getComponent("userContentCacheManager");
userContentCacheManager.evictUserContentCache(subjectUserPrincipal.getName(), se.getSession().getId());
}
/**
* Extendable and overridable default main request error handling method.
*
* Be aware: the context parameter might not (yet) be initialized, or not anymore here, so it should always
* be checked against null. Furthermore, not all RequestContext methods might be valid to use or call (anymore) either.
*
* @param req the original portal request
* @param res the original portal response
* @param context the context created for handling this request
* @param e the exception as occurred
* @throws IOException
* @throws ServletException
*/
protected void handleError(HttpServletRequest req, HttpServletResponse res, RequestContext context, Throwable t) throws IOException, ServletException
{
String errorHandlerPath = getInitParameter(ERROR_HANDLER_PATH_PARM);
if (errorHandlerPath == null || errorHandlerPath.trim().length() == 0)
{
errorHandlerPath = DEFAULT_ERROR_HANDLER_PATH;
}
final String msg = "Request error encountered while processing portal request: "+t.getMessage();
log.error(msg, t);
// try to unwind and see if an Exception was thrown containing a RequestDiagnostics
RequestDiagnostics rd = null;
Throwable e = t;
do
{
if (e instanceof RequestDiagnosticsHolder && ((RequestDiagnosticsHolder)e).getRequestDiagnostics() != null)
{
rd = ((RequestDiagnosticsHolder)e).getRequestDiagnostics();
break;
}
e = e.getCause();
}
while (e != null);
if (rd == null)
{
rd = RequestDiagnosticsFactory.newRequestDiagnostics();
}
RequestDiagnosticsFactory.fillInRequestContext(rd, req, context, t);
rd.logAsError();
req.getSession(true).setAttribute(PortalReservedParameters.REQUEST_DIAGNOSTICS_ATTRIBUTE, rd);
res.sendRedirect(req.getContextPath() + errorHandlerPath);
}
/**
* Cleanup errorHandler state usefull if/when the errorHandler stores error state within the session
* @param req
*/
protected void cleanupError(HttpServletRequest req)
{
HttpSession session = req.getSession(false);
if (session != null)
{
session.removeAttribute(PortalReservedParameters.REQUEST_DIAGNOSTICS_ATTRIBUTE);
}
}
}