/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (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, 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.file.CmsFile;
import org.opencms.file.CmsObject;
import org.opencms.file.CmsResource;
import org.opencms.file.CmsResourceFilter;
import org.opencms.i18n.CmsMessageContainer;
import org.opencms.staticexport.CmsStaticExportData;
import org.opencms.staticexport.CmsStaticExportRequest;
import org.opencms.util.CmsRequestUtil;
import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
/**
* This the main servlet of the OpenCms system.<p>
*
* From here, all operations that are results of HTTP requests are invoked.
* Any incoming request is handled in multiple steps:
*
* <ol><li>The requesting <code>{@link org.opencms.file.CmsUser}</code> is authenticated
* and a <code>{@link org.opencms.file.CmsObject}</code> with this users context information
* is created. This <code>{@link org.opencms.file.CmsObject}</code> is used to access all functions of OpenCms, limited by
* the authenticated users permissions. If the user is not identified, it is set to the default user, usually named "Guest".</li>
*
* <li>The requested <code>{@link org.opencms.file.CmsResource}</code> is loaded into OpenCms and depending on its type
* (and the users persmissions to display or modify it),
* it is send to one of the OpenCms <code>{@link org.opencms.loader.I_CmsResourceLoader}</code> implementations
* do be processed.</li>
*
* <li>
* The <code>{@link org.opencms.loader.I_CmsResourceLoader}</code> will then decide what to do with the
* contents of the requested <code>{@link org.opencms.file.CmsResource}</code>.
* In case of a JSP resource the JSP handling mechanism is invoked with the <code>{@link org.opencms.loader.CmsJspLoader}</code>,
* in case of an image (or another static resource) this will be returned by the <code>{@link org.opencms.loader.CmsDumpLoader}</code>
* etc.
* </li></ol>
*
* @since 6.0.0
*
* @see org.opencms.main.CmsShell
* @see org.opencms.file.CmsObject
* @see org.opencms.main.OpenCms
*/
public class OpenCmsServlet extends HttpServlet implements I_CmsRequestHandler {
/** GWT RPC services suffix. */
public static final String HANDLE_GWT = ".gwt";
/** Name of the <code>DefaultWebApplication</code> parameter in the <code>web.xml</code> OpenCms servlet configuration. */
public static final String SERVLET_PARAM_DEFAULT_WEB_APPLICATION = "DefaultWebApplication";
/** Name of the <code>OpenCmsHome</code> parameter in the <code>web.xml</code> OpenCms servlet configuration. */
public static final String SERVLET_PARAM_OPEN_CMS_HOME = "OpenCmsHome";
/** Name of the <code>OpenCmsServlet</code> parameter in the <code>web.xml</code> OpenCms servlet configuration. */
public static final String SERVLET_PARAM_OPEN_CMS_SERVLET = "OpenCmsServlet";
/** Name of the <code>WebApplicationContext</code> parameter in the <code>web.xml</code> OpenCms servlet configuration. */
public static final String SERVLET_PARAM_WEB_APPLICATION_CONTEXT = "WebApplicationContext";
/** Handler prefix. */
private static final String HANDLE_PATH = "/handle";
/** Path to handler "error page" files in the VFS. */
private static final String HANDLE_VFS_PATH = "/system/handler" + HANDLE_PATH;
/** Handler "error page" file suffix. */
private static final String HANDLE_VFS_SUFFIX = ".html";
/** Handler implementation names. */
private static final String[] HANDLER_NAMES = {"404"};
/** The log object for this class. */
private static final Log LOG = CmsLog.getLog(OpenCmsServlet.class);
/** Serial version UID required for safe serialization. */
private static final long serialVersionUID = 4729951599966070050L;
/**
* OpenCms servlet main request handling method.<p>
*
* @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
@Override
public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException {
// check to OpenCms runlevel
int runlevel = OpenCmsCore.getInstance().getRunLevel();
// write OpenCms server identification in the response header
res.setHeader(CmsRequestUtil.HEADER_SERVER, OpenCmsCore.getInstance().getSystemInfo().getVersion());
if (runlevel != OpenCms.RUNLEVEL_4_SERVLET_ACCESS) {
// not the "normal" servlet runlevel
if (runlevel == OpenCms.RUNLEVEL_3_SHELL_ACCESS) {
// we have shell runlevel only, upgrade to servlet runlevel (required after setup wizard)
init(getServletConfig());
} else {
// illegal runlevel, we can't process requests
// sending status code 403, indicating the server understood the request but refused to fulfill it
res.sendError(HttpServletResponse.SC_FORBIDDEN);
// goodbye
return;
}
}
String path = OpenCmsCore.getInstance().getPathInfo(req);
if (path.startsWith(HANDLE_PATH)) {
// this is a request to an OpenCms handler URI
invokeHandler(req, res);
} else if (path.endsWith(HANDLE_GWT)) {
// handle GWT rpc services
String serviceName = CmsResource.getName(path);
serviceName = serviceName.substring(0, serviceName.length() - HANDLE_GWT.length());
OpenCmsCore.getInstance().invokeGwtService(serviceName, req, res, getServletConfig());
} else {
// standard request to a URI in the OpenCms VFS
OpenCmsCore.getInstance().showResource(req, res);
}
}
/**
* OpenCms servlet POST request handling method,
* will just call {@link #doGet(HttpServletRequest, HttpServletResponse)}.<p>
*
* @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
@Override
public void doPost(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException {
doGet(req, res);
}
/**
* @see org.opencms.main.I_CmsRequestHandler#getHandlerNames()
*/
public String[] getHandlerNames() {
return HANDLER_NAMES;
}
/**
* @see org.opencms.main.I_CmsRequestHandler#handle(HttpServletRequest, HttpServletResponse, String)
*/
public void handle(HttpServletRequest req, HttpServletResponse res, String name)
throws IOException, ServletException {
int errorCode;
try {
errorCode = Integer.valueOf(name).intValue();
} catch (NumberFormatException nf) {
res.sendError(HttpServletResponse.SC_FORBIDDEN);
return;
}
switch (errorCode) {
case 404:
CmsObject cms = null;
CmsStaticExportData exportData = null;
try {
// this will be set in the root site
cms = OpenCms.initCmsObject(OpenCms.getDefaultUsers().getUserExport());
exportData = OpenCms.getStaticExportManager().getExportData(req, cms);
} catch (CmsException e) {
// unlikely to happen
if (LOG.isWarnEnabled()) {
LOG.warn(
Messages.get().getBundle().key(
Messages.LOG_INIT_CMSOBJECT_IN_HANDLER_2,
name,
OpenCmsCore.getInstance().getPathInfo(req)),
e);
}
}
if (exportData != null) {
try {
// generate a static export request wrapper
CmsStaticExportRequest exportReq = new CmsStaticExportRequest(req, exportData);
// export the resource and set the response status according to the result
res.setStatus(OpenCms.getStaticExportManager().export(exportReq, res, cms, exportData));
} catch (Throwable t) {
if (LOG.isWarnEnabled()) {
LOG.warn(Messages.get().getBundle().key(Messages.LOG_ERROR_EXPORT_1, exportData), t);
}
openErrorHandler(req, res, errorCode);
}
} else {
openErrorHandler(req, res, errorCode);
}
break;
default:
openErrorHandler(req, res, errorCode);
}
}
/**
* @see javax.servlet.Servlet#init(javax.servlet.ServletConfig)
*/
@Override
public synchronized void init(ServletConfig config) throws ServletException {
super.init(config);
try {
// upgrade the runlevel
// usually this should have already been done by the context listener
// however, after a fresh install / setup this will be done from here
OpenCmsCore.getInstance().upgradeRunlevel(config.getServletContext());
// finalize OpenCms initialization
OpenCmsCore.getInstance().initServlet(this);
} catch (CmsInitException e) {
if (Messages.ERR_CRITICAL_INIT_WIZARD_0.equals(e.getMessageContainer().getKey())) {
// if wizard is still enabled - allow retry of initialization (required for setup wizard)
// this means the servlet init() call must be terminated by an exception
if (CmsServletContainerSettings.isServletThrowsException()) {
throw new ServletException(e.getMessage());
} else {
// this is needed since some servlet containers does not like the servlet to throw exceptions,
// like BEA WLS 9.x and Resin
LOG.error(Messages.get().getBundle().key(Messages.LOG_ERROR_GENERIC_0), e);
}
}
} catch (Throwable t) {
LOG.error(Messages.get().getBundle().key(Messages.LOG_ERROR_GENERIC_0), t);
}
}
/**
* Manages requests to internal OpenCms request handlers.<p>
*
* @param req the current request
* @param res the current response
* @throws ServletException in case an error occurs
* @throws ServletException in case an error occurs
* @throws IOException in case an error occurs
*/
protected void invokeHandler(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException {
String name = OpenCmsCore.getInstance().getPathInfo(req).substring(HANDLE_PATH.length());
I_CmsRequestHandler handler = OpenCmsCore.getInstance().getRequestHandler(name);
if (handler != null) {
handler.handle(req, res, name);
} else {
openErrorHandler(req, res, HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
}
}
/**
* Displays an error code handler loaded from the OpenCms VFS,
* or if such a page does not exist,
* displays the default servlet container error code.<p>
*
* @param req the current request
* @param res the current response
* @param errorCode the error code to display
* @throws IOException if something goes wrong
* @throws ServletException if something goes wrong
*/
protected void openErrorHandler(HttpServletRequest req, HttpServletResponse res, int errorCode)
throws IOException, ServletException {
String handlerUri = (new StringBuffer(64)).append(HANDLE_VFS_PATH).append(errorCode).append(HANDLE_VFS_SUFFIX).toString();
CmsObject cms;
CmsFile file;
try {
// create OpenCms context, this will be set in the root site
cms = OpenCms.initCmsObject(OpenCms.getDefaultUsers().getUserGuest());
cms.getRequestContext().setUri(handlerUri);
// read the error handler file
file = cms.readFile(handlerUri, CmsResourceFilter.IGNORE_EXPIRATION);
} catch (CmsException e) {
// unlikely to happen as the OpenCms "Guest" context can always be initialized
CmsMessageContainer container = Messages.get().container(
Messages.LOG_INIT_CMSOBJECT_IN_HANDLER_2,
new Integer(errorCode),
handlerUri);
if (LOG.isWarnEnabled()) {
LOG.warn(org.opencms.jsp.Messages.getLocalizedMessage(container, req), e);
}
// however, if it _does_ happen, then we really can't continue here
if (!res.isCommitted()) {
// since the handler file is not accessible, display the default error page
res.sendError(errorCode, e.getLocalizedMessage());
}
return;
}
try {
// provide the original error code in a request attribute
req.setAttribute(CmsRequestUtil.ATTRIBUTE_ERRORCODE, new Integer(errorCode));
OpenCms.getResourceManager().loadResource(cms, file, req, res);
} catch (CmsException e) {
// unable to load error page handler VFS resource
CmsMessageContainer container = Messages.get().container(
Messages.ERR_SHOW_ERR_HANDLER_RESOURCE_2,
new Integer(errorCode),
handlerUri);
throw new ServletException(org.opencms.jsp.Messages.getLocalizedMessage(container, req), e);
}
}
}