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/*
* 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.jasper.servlet;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.net.MalformedURLException;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import javax.servlet.RequestDispatcher;
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 org.apache.jasper.Constants;
import org.apache.jasper.EmbeddedServletOptions;
import org.apache.jasper.Options;
import org.apache.jasper.compiler.JspRuntimeContext;
import org.apache.jasper.compiler.Localizer;
import org.apache.jasper.runtime.ExceptionUtils;
import org.apache.jasper.security.SecurityUtil;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.PeriodicEventListener;
import org.apache.tomcat.util.security.Escape;
/**
* The JSP engine (a.k.a Jasper).
*
* The servlet container is responsible for providing a
* URLClassLoader for the web application context Jasper
* is being used in. Jasper will try get the Tomcat
* ServletContext attribute for its ServletContext class
* loader, if that fails, it uses the parent class loader.
* In either case, it must be a URLClassLoader.
*
* @author Anil K. Vijendran
* @author Harish Prabandham
* @author Remy Maucherat
* @author Kin-man Chung
* @author Glenn Nielsen
*/
public class JspServlet extends HttpServlet implements PeriodicEventListener {
private static final long serialVersionUID = 1L;
// Logger
private final transient Log log = LogFactory.getLog(JspServlet.class);
private transient ServletContext context;
private ServletConfig config;
private transient Options options;
private transient JspRuntimeContext rctxt;
// jspFile for a jsp configured explicitly as a servlet, in environments where this
// configuration is translated into an init-param for this servlet.
private String jspFile;
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
this.config = config;
this.context = config.getServletContext();
// Initialize the JSP Runtime Context
// Check for a custom Options implementation
String engineOptionsName = config.getInitParameter("engineOptionsClass");
if (Constants.IS_SECURITY_ENABLED && engineOptionsName != null) {
log.info(Localizer.getMessage(
"jsp.info.ignoreSetting", "engineOptionsClass", engineOptionsName));
engineOptionsName = null;
}
if (engineOptionsName != null) {
// Instantiate the indicated Options implementation
try {
ClassLoader loader = Thread.currentThread().getContextClassLoader();
Class> engineOptionsClass = loader.loadClass(engineOptionsName);
Class>[] ctorSig = { ServletConfig.class, ServletContext.class };
Constructor> ctor = engineOptionsClass.getConstructor(ctorSig);
Object[] args = { config, context };
options = (Options) ctor.newInstance(args);
} catch (Throwable e) {
e = ExceptionUtils.unwrapInvocationTargetException(e);
ExceptionUtils.handleThrowable(e);
// Need to localize this.
log.warn(Localizer.getMessage("jsp.warning.engineOptionsClass", engineOptionsName), e);
// Use the default Options implementation
options = new EmbeddedServletOptions(config, context);
}
} else {
// Use the default Options implementation
options = new EmbeddedServletOptions(config, context);
}
rctxt = new JspRuntimeContext(context, options);
if (config.getInitParameter("jspFile") != null) {
jspFile = config.getInitParameter("jspFile");
try {
if (null == context.getResource(jspFile)) {
return;
}
} catch (MalformedURLException e) {
throw new ServletException(Localizer.getMessage("jsp.error.no.jsp", jspFile), e);
}
try {
if (SecurityUtil.isPackageProtectionEnabled()){
AccessController.doPrivileged((PrivilegedExceptionAction