/*
* 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.core;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.CometEvent;
import org.apache.catalina.Context;
import org.apache.catalina.Globals;
import org.apache.catalina.Wrapper;
import org.apache.catalina.connector.ClientAbortException;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;
import org.apache.catalina.deploy.ErrorPage;
import org.apache.catalina.util.RequestUtil;
import org.apache.catalina.util.StringManager;
import org.apache.catalina.valves.ValveBase;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
/**
* Valve that implements the default basic behavior for the
* <code>StandardHost</code> container implementation.
* <p>
* <b>USAGE CONSTRAINT</b>: This implementation is likely to be useful only
* when processing HTTP requests.
*
* @author Craig R. McClanahan
* @author Remy Maucherat
* @version $Revision: 487694 $ $Date: 2006-12-15 23:30:51 +0100 (ven., 15 déc. 2006) $
*/
final class StandardHostValve
extends ValveBase {
private static Log log = LogFactory.getLog(StandardHostValve.class);
// ----------------------------------------------------- Instance Variables
/**
* The descriptive information related to this implementation.
*/
private static final String info =
"org.apache.catalina.core.StandardHostValve/1.0";
/**
* The string manager for this package.
*/
private static final StringManager sm =
StringManager.getManager(Constants.Package);
// ------------------------------------------------------------- Properties
/**
* Return descriptive information about this Valve implementation.
*/
public String getInfo() {
return (info);
}
// --------------------------------------------------------- Public Methods
/**
* Select the appropriate child Context to process this request,
* based on the specified request URI. If no matching Context can
* be found, return an appropriate HTTP error.
*
* @param request Request to be processed
* @param response Response to be produced
* @param valveContext Valve context used to forward to the next Valve
*
* @exception IOException if an input/output error occurred
* @exception ServletException if a servlet error occurred
*/
public final void invoke(Request request, Response response)
throws IOException, ServletException {
// Select the Context to be used for this Request
Context context = request.getContext();
if (context == null) {
response.sendError
(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
sm.getString("standardHost.noContext"));
return;
}
// Bind the context CL to the current thread
if( context.getLoader() != null ) {
// Not started - it should check for availability first
// This should eventually move to Engine, it's generic.
Thread.currentThread().setContextClassLoader
(context.getLoader().getClassLoader());
}
// Ask this Context to process this request
context.getPipeline().getFirst().invoke(request, response);
// Access a session (if present) to update last accessed time, based on a
// strict interpretation of the specification
if (Globals.STRICT_SERVLET_COMPLIANCE) {
request.getSession(false);
}
// Error page processing
response.setSuspended(false);
Throwable t = (Throwable) request.getAttribute(Globals.EXCEPTION_ATTR);
if (t != null) {
throwable(request, response, t);
} else {
status(request, response);
}
// Restore the context classloader
Thread.currentThread().setContextClassLoader
(StandardHostValve.class.getClassLoader());
}
/**
* Process Comet event.
*
* @param request Request to be processed
* @param response Response to be produced
* @param valveContext Valve context used to forward to the next Valve
*
* @exception IOException if an input/output error occurred
* @exception ServletException if a servlet error occurred
*/
public final void event(Request request, Response response, CometEvent event)
throws IOException, ServletException {
// Select the Context to be used for this Request
Context context = request.getContext();
// Bind the context CL to the current thread
if( context.getLoader() != null ) {
// Not started - it should check for availability first
// This should eventually move to Engine, it's generic.
Thread.currentThread().setContextClassLoader
(context.getLoader().getClassLoader());
}
// Ask this Context to process this request
context.getPipeline().getFirst().event(request, response, event);
// Access a session (if present) to update last accessed time, based on a
// strict interpretation of the specification
if (Globals.STRICT_SERVLET_COMPLIANCE) {
request.getSession(false);
}
// Error page processing
response.setSuspended(false);
Throwable t = (Throwable) request.getAttribute(Globals.EXCEPTION_ATTR);
if (t != null) {
throwable(request, response, t);
} else {
status(request, response);
}
// Restore the context classloader
Thread.currentThread().setContextClassLoader
(StandardHostValve.class.getClassLoader());
}
// ------------------------------------------------------ Protected Methods
/**
* Handle the specified Throwable encountered while processing
* the specified Request to produce the specified Response. Any
* exceptions that occur during generation of the exception report are
* logged and swallowed.
*
* @param request The request being processed
* @param response The response being generated
* @param throwable The exception that occurred (which possibly wraps
* a root cause exception
*/
protected void throwable(Request request, Response response,
Throwable throwable) {
Context context = request.getContext();
if (context == null)
return;
Throwable realError = throwable;
if (realError instanceof ServletException) {
realError = ((ServletException) realError).getRootCause();
if (realError == null) {
realError = throwable;
}
}
// If this is an aborted request from a client just log it and return
if (realError instanceof ClientAbortException ) {
if (log.isDebugEnabled()) {
log.debug
(sm.getString("standardHost.clientAbort",
realError.getCause().getMessage()));
}
return;
}
ErrorPage errorPage = findErrorPage(context, throwable);
if ((errorPage == null) && (realError != throwable)) {
errorPage = findErrorPage(context, realError);
}
if (errorPage != null) {
response.setAppCommitted(false);
request.setAttribute
(ApplicationFilterFactory.DISPATCHER_REQUEST_PATH_ATTR,
errorPage.getLocation());
request.setAttribute(ApplicationFilterFactory.DISPATCHER_TYPE_ATTR,
new Integer(ApplicationFilterFactory.ERROR));
request.setAttribute
(Globals.STATUS_CODE_ATTR,
new Integer(HttpServletResponse.SC_INTERNAL_SERVER_ERROR));
request.setAttribute(Globals.ERROR_MESSAGE_ATTR,
throwable.getMessage());
request.setAttribute(Globals.EXCEPTION_ATTR,
realError);
Wrapper wrapper = request.getWrapper();
if (wrapper != null)
request.setAttribute(Globals.SERVLET_NAME_ATTR,
wrapper.getName());
request.setAttribute(Globals.EXCEPTION_PAGE_ATTR,
request.getRequestURI());
request.setAttribute(Globals.EXCEPTION_TYPE_ATTR,
realError.getClass());
if (custom(request, response, errorPage)) {
try {
response.flushBuffer();
} catch (IOException e) {
container.getLogger().warn("Exception Processing " + errorPage, e);
}
}
} else {
// A custom error-page has not been defined for the exception
// that was thrown during request processing. Check if an
// error-page for error code 500 was specified and if so,
// send that page back as the response.
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
// The response is an error
response.setError();
status(request, response);
}
}
/**
* Handle the HTTP status code (and corresponding message) generated
* while processing the specified Request to produce the specified
* Response. Any exceptions that occur during generation of the error
* report are logged and swallowed.
*
* @param request The request being processed
* @param response The response being generated
*/
protected void status(Request request, Response response) {
int statusCode = response.getStatus();
// Handle a custom error page for this status code
Context context = request.getContext();
if (context == null)
return;
/* Only look for error pages when isError() is set.
* isError() is set when response.sendError() is invoked. This
* allows custom error pages without relying on default from
* web.xml.
*/
if (!response.isError())
return;
ErrorPage errorPage = context.findErrorPage(statusCode);
if (errorPage != null) {
response.setAppCommitted(false);
request.setAttribute(Globals.STATUS_CODE_ATTR,
new Integer(statusCode));
String message = RequestUtil.filter(response.getMessage());
if (message == null)
message = "";
request.setAttribute(Globals.ERROR_MESSAGE_ATTR, message);
request.setAttribute
(ApplicationFilterFactory.DISPATCHER_REQUEST_PATH_ATTR,
errorPage.getLocation());
request.setAttribute(ApplicationFilterFactory.DISPATCHER_TYPE_ATTR,
new Integer(ApplicationFilterFactory.ERROR));
Wrapper wrapper = request.getWrapper();
if (wrapper != null)
request.setAttribute(Globals.SERVLET_NAME_ATTR,
wrapper.getName());
request.setAttribute(Globals.EXCEPTION_PAGE_ATTR,
request.getRequestURI());
if (custom(request, response, errorPage)) {
try {
response.flushBuffer();
} catch (ClientAbortException e) {
// Ignore
} catch (IOException e) {
container.getLogger().warn("Exception Processing " + errorPage, e);
}
}
}
}
/**
* Find and return the ErrorPage instance for the specified exception's
* class, or an ErrorPage instance for the closest superclass for which
* there is such a definition. If no associated ErrorPage instance is
* found, return <code>null</code>.
*
* @param context The Context in which to search
* @param exception The exception for which to find an ErrorPage
*/
protected static ErrorPage findErrorPage
(Context context, Throwable exception) {
if (exception == null)
return (null);
Class clazz = exception.getClass();
String name = clazz.getName();
while (!Object.class.equals(clazz)) {
ErrorPage errorPage = context.findErrorPage(name);
if (errorPage != null)
return (errorPage);
clazz = clazz.getSuperclass();
if (clazz == null)
break;
name = clazz.getName();
}
return (null);
}
/**
* Handle an HTTP status code or Java exception by forwarding control
* to the location included in the specified errorPage object. It is
* assumed that the caller has already recorded any request attributes
* that are to be forwarded to this page. Return <code>true</code> if
* we successfully utilized the specified error page location, or
* <code>false</code> if the default error report should be rendered.
*
* @param request The request being processed
* @param response The response being generated
* @param errorPage The errorPage directive we are obeying
*/
protected boolean custom(Request request, Response response,
ErrorPage errorPage) {
if (container.getLogger().isDebugEnabled())
container.getLogger().debug("Processing " + errorPage);
request.setPathInfo(errorPage.getLocation());
try {
// Reset the response if possible (else IllegalStateException)
//hres.reset();
// Reset the response (keeping the real error code and message)
Integer statusCodeObj =
(Integer) request.getAttribute(Globals.STATUS_CODE_ATTR);
int statusCode = statusCodeObj.intValue();
String message =
(String) request.getAttribute(Globals.ERROR_MESSAGE_ATTR);
response.reset(statusCode, message);
// Forward control to the specified location
ServletContext servletContext =
request.getContext().getServletContext();
RequestDispatcher rd =
servletContext.getRequestDispatcher(errorPage.getLocation());
rd.forward(request.getRequest(), response.getResponse());
// If we forward, the response is suspended again
response.setSuspended(false);
// Indicate that we have successfully processed this custom page
return (true);
} catch (Throwable t) {
// Report our failure to process this custom page
container.getLogger().error("Exception Processing " + errorPage, t);
return (false);
}
}
}
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