/*
* 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.catalina.servlets;
import java.io.IOException;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.UnavailableException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.ContainerServlet;
import org.apache.catalina.Context;
import org.apache.catalina.Globals;
import org.apache.catalina.Wrapper;
import org.apache.catalina.util.StringManager;
/**
* The default servlet-invoking servlet for most web applications,
* used to serve requests to servlets that have not been registered
* in the web application deployment descriptor.
*
* @author Craig R. McClanahan
* @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
*/
public final class InvokerServlet
extends HttpServlet implements ContainerServlet {
// ----------------------------------------------------- Instance Variables
/**
* The Context container associated with our web application.
*/
private Context context = null;
/**
* The debugging detail level for this servlet.
*/
private int debug = 0;
/**
* The string manager for this package.
*/
private static StringManager sm =
StringManager.getManager(Constants.Package);
/**
* The Wrapper container associated with this servlet.
*/
private Wrapper wrapper = null;
// ----------------------------------------------- ContainerServlet Methods
/**
* Return the Wrapper with which we are associated.
*/
public Wrapper getWrapper() {
return (this.wrapper);
}
/**
* Set the Wrapper with which we are associated.
*
* @param wrapper The new wrapper
*/
public void setWrapper(Wrapper wrapper) {
this.wrapper = wrapper;
if (wrapper == null)
context = null;
else
context = (Context) wrapper.getParent();
}
// --------------------------------------------------------- Public Methods
/**
* Finalize this servlet.
*/
public void destroy() {
; // No actions necessary
}
/**
* Process a GET request for the specified resource.
*
* @param request The servlet request we are processing
* @param response The servlet response we are creating
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet-specified error occurs
*/
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
serveRequest(request, response);
}
/**
* Process a HEAD request for the specified resource.
*
* @param request The servlet request we are processing
* @param response The servlet response we are creating
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet-specified error occurs
*/
public void doHead(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
serveRequest(request, response);
}
/**
* Process a POST request for the specified resource.
*
* @param request The servlet request we are processing
* @param response The servlet response we are creating
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet-specified error occurs
*/
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
serveRequest(request, response);
}
/**
* Initialize this servlet.
*/
public void init() throws ServletException {
// Ensure that our ContainerServlet properties have been set
if ((wrapper == null) || (context == null))
throw new UnavailableException
(sm.getString("invokerServlet.noWrapper"));
// Set our properties from the initialization parameters
if (getServletConfig().getInitParameter("debug") != null)
debug = Integer.parseInt(getServletConfig().getInitParameter("debug"));
if (debug >= 1)
log("init: Associated with Context '" + context.getPath() + "'");
}
// -------------------------------------------------------- Private Methods
/**
* Serve the specified request, creating the corresponding response.
* After the first time a particular servlet class is requested, it will
* be served directly (like any registered servlet) because it will have
* been registered and mapped in our associated Context.
*
* @param request The servlet request we are processing
* @param response The servlet response we are creating
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet-specified error occurs
*/
public void serveRequest(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
// Disallow calling this servlet via a named dispatcher
if (request.getAttribute(Globals.NAMED_DISPATCHER_ATTR) != null)
throw new ServletException
(sm.getString("invokerServlet.notNamed"));
// Identify the input parameters and our "included" state
String inRequestURI = null;
String inServletPath = null;
String inPathInfo = null;
boolean included =
(request.getAttribute(Globals.INCLUDE_REQUEST_URI_ATTR) != null);
if (included) {
inRequestURI =
(String) request.getAttribute(Globals.INCLUDE_REQUEST_URI_ATTR);
inServletPath =
(String) request.getAttribute(Globals.INCLUDE_SERVLET_PATH_ATTR);
inPathInfo =
(String) request.getAttribute(Globals.INCLUDE_PATH_INFO_ATTR);
} else {
inRequestURI = request.getRequestURI();
inServletPath = request.getServletPath();
inPathInfo = request.getPathInfo();
}
if (debug >= 1) {
log("included='" + included + "', requestURI='" +
inRequestURI + "'");
log(" servletPath='" + inServletPath + "', pathInfo='" +
inPathInfo + "'");
}
// Make sure a servlet name or class name was specified
if (inPathInfo == null) {
if (debug >= 1)
log("Invalid pathInfo '" + inPathInfo + "'");
if (included)
throw new ServletException
(sm.getString("invokerServlet.invalidPath", inRequestURI));
else {
response.sendError(HttpServletResponse.SC_NOT_FOUND,
inRequestURI);
return;
}
}
// Identify the outgoing servlet name or class, and outgoing path info
String pathInfo = inPathInfo;
String servletClass = pathInfo.substring(1);
int slash = servletClass.indexOf('/');
if (slash >= 0) {
pathInfo = servletClass.substring(slash);
servletClass = servletClass.substring(0, slash);
} else {
pathInfo = "";
}
if (servletClass.startsWith("org.apache.catalina")) {
response.sendError(HttpServletResponse.SC_NOT_FOUND,
inRequestURI);
return;
}
if (debug >= 1)
log("Processing servlet '" + servletClass +
"' with path info '" + pathInfo + "'");
String name = "org.apache.catalina.INVOKER." + servletClass;
String pattern = inServletPath + "/" + servletClass + "/*";
Wrapper wrapper = null;
// Synchronize to avoid race conditions when multiple requests
// try to initialize the same servlet at the same time
synchronized (this) {
// Are we referencing an existing servlet class or name?
wrapper = (Wrapper) context.findChild(servletClass);
if (wrapper == null)
wrapper = (Wrapper) context.findChild(name);
if (wrapper != null) {
String actualServletClass = wrapper.getServletClass();
if ((actualServletClass != null)
&& (actualServletClass.startsWith
("org.apache.catalina"))) {
response.sendError(HttpServletResponse.SC_NOT_FOUND,
inRequestURI);
return;
}
if (debug >= 1)
log("Using wrapper for servlet '" +
wrapper.getName() + "' with mapping '" +
pattern + "'");
context.addServletMapping(pattern, wrapper.getName());
}
// No, create a new wrapper for the specified servlet class
else {
if (debug >= 1)
log("Creating wrapper for '" + servletClass +
"' with mapping '" + pattern + "'");
try {
wrapper = context.createWrapper();
wrapper.setName(name);
wrapper.setLoadOnStartup(1);
wrapper.setServletClass(servletClass);
context.addChild(wrapper);
context.addServletMapping(pattern, name);
} catch (Exception e) {
log(sm.getString("invokerServlet.cannotCreate",
inRequestURI), e);
context.removeServletMapping(pattern);
context.removeChild(wrapper);
if (included)
throw new ServletException
(sm.getString("invokerServlet.cannotCreate",
inRequestURI), e);
else {
response.sendError(HttpServletResponse.SC_NOT_FOUND,
inRequestURI);
return;
}
}
}
}
// Create a request wrapper to pass on to the invoked servlet
InvokerHttpRequest wrequest =
new InvokerHttpRequest(request);
wrequest.setRequestURI(inRequestURI);
StringBuffer sb = new StringBuffer(inServletPath);
sb.append("/");
sb.append(servletClass);
wrequest.setServletPath(sb.toString());
if ((pathInfo == null) || (pathInfo.length() < 1)) {
wrequest.setPathInfo(null);
wrequest.setPathTranslated(null);
} else {
wrequest.setPathInfo(pathInfo);
wrequest.setPathTranslated
(getServletContext().getRealPath(pathInfo));
}
// Allocate a servlet instance to perform this request
Servlet instance = null;
try {
instance = wrapper.allocate();
} catch (ServletException e) {
log(sm.getString("invokerServlet.allocate", inRequestURI), e);
context.removeServletMapping(pattern);
context.removeChild(wrapper);
Throwable rootCause = e.getRootCause();
if (rootCause == null)
rootCause = e;
if (rootCause instanceof ClassNotFoundException) {
response.sendError(HttpServletResponse.SC_NOT_FOUND,
inRequestURI);
return;
} else if (rootCause instanceof IOException) {
throw (IOException) rootCause;
} else if (rootCause instanceof RuntimeException) {
throw (RuntimeException) rootCause;
} else if (rootCause instanceof ServletException) {
throw (ServletException) rootCause;
} else {
throw new ServletException
(sm.getString("invokerServlet.allocate", inRequestURI),
rootCause);
}
}
// After loading the wrapper, restore some of the fields when including
if (included) {
wrequest.setRequestURI(request.getRequestURI());
wrequest.setPathInfo(request.getPathInfo());
wrequest.setServletPath(request.getServletPath());
}
// Invoke the service() method of the allocated servlet
try {
String jspFile = wrapper.getJspFile();
if (jspFile != null)
request.setAttribute(Globals.JSP_FILE_ATTR, jspFile);
else
request.removeAttribute(Globals.JSP_FILE_ATTR);
request.setAttribute(Globals.INVOKED_ATTR,
request.getServletPath());
instance.service(wrequest, response);
} catch (UnavailableException e) {
context.removeServletMapping(pattern);
throw e;
} finally {
request.removeAttribute(Globals.INVOKED_ATTR);
request.removeAttribute(Globals.JSP_FILE_ATTR);
// Deallocate the allocated servlet instance
try {
wrapper.deallocate(instance);
} catch (ServletException e) {
log(sm.getString("invokerServlet.deallocate", inRequestURI), e);
throw e;
}
}
}
}
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