Quelle JspServlet.java Sprache: JAVA

/*
* 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 jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.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;

 /*
 * Initializes this JspServlet.
 */
 @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<Object>) () -> {
 serviceJspFile(null, null, jspFile, true);
 return null;
 });
 } else {
 serviceJspFile(null, null, jspFile, true);
 }
 } catch (IOException e) {
 throw new ServletException(Localizer.getMessage("jsp.error.precompilation", jspFile), e);
 } catch (PrivilegedActionException e) {
 Throwable t = e.getCause();
 if (t instanceof ServletException) {
 throw (ServletException)t;
 }
 throw new ServletException(Localizer.getMessage("jsp.error.precompilation", jspFile), e);
 }
 }

 if (log.isDebugEnabled()) {
 log.debug(Localizer.getMessage("jsp.message.scratch.dir.is",
 options.getScratchDir().toString()));
 log.debug(Localizer.getMessage("jsp.message.dont.modify.servlets"));
 }
 }

 /**
 * Returns the number of JSPs for which JspServletWrappers exist, i.e.,
 * the number of JSPs that have been loaded into the webapp with which
 * this JspServlet is associated.
 *
 * This info may be used for monitoring purposes.
 *
 * @return The number of JSPs that have been loaded into the webapp with
 * which this JspServlet is associated
 */
 public int getJspCount() {
 return this.rctxt.getJspCount();
 }

 /**
 * Resets the JSP reload counter.
 *
 * @param count Value to which to reset the JSP reload counter
 */
 public void setJspReloadCount(int count) {
 this.rctxt.setJspReloadCount(count);
 }

 /**
 * Gets the number of JSPs that have been reloaded.
 *
 * This info may be used for monitoring purposes.
 *
 * @return The number of JSPs (in the webapp with which this JspServlet is
 * associated) that have been reloaded
 */
 public int getJspReloadCount() {
 return this.rctxt.getJspReloadCount();
 }

 /**
 * Gets the number of JSPs that are in the JSP limiter queue
 *
 * This info may be used for monitoring purposes.
 *
 * @return The number of JSPs (in the webapp with which this JspServlet is
 * associated) that are in the JSP limiter queue
 */
 public int getJspQueueLength() {
 return this.rctxt.getJspQueueLength();
 }

 /**
 * Gets the number of JSPs that have been unloaded.
 *
 * This info may be used for monitoring purposes.
 *
 * @return The number of JSPs (in the webapp with which this JspServlet is
 * associated) that have been unloaded
 */
 public int getJspUnloadCount() {
 return this.rctxt.getJspUnloadCount();
 }

 /**
 * Look for a precompilation request as described in
 * Section 8.4.2 of the JSP 1.2 Specification. WARNING -
 * we cannot use <code>request.getParameter()</code> for this, because
 * that will trigger parsing all of the request parameters, and not give
 * a servlet the opportunity to call
 * <code>request.setCharacterEncoding()</code> first.
 *
 * @param request The servlet request we are processing
 *
 * @exception ServletException if an invalid parameter value for the
 * <code>jsp_precompile</code> parameter name is specified
 */
 boolean preCompile(HttpServletRequest request) throws ServletException {

 String precompileParameter = rctxt.getOptions().getJspPrecompilationQueryParameter();
 String queryString = request.getQueryString();
 if (queryString == null) {
 return false;
 }
 int start = queryString.indexOf(precompileParameter);
 if (start < 0) {
 return false;
 }
 queryString =
 queryString.substring(start + precompileParameter.length());
 if (queryString.length() == 0) {
 return true; // ?jsp_precompile
 }
 if (queryString.startsWith("&")) {
 return true; // ?jsp_precompile&foo=bar...
 }
 if (!queryString.startsWith("=")) {
 return false; // part of some other name or value
 }
 int limit = queryString.length();
 int ampersand = queryString.indexOf('&');
 if (ampersand > 0) {
 limit = ampersand;
 }
 String value = queryString.substring(1, limit);
 if (value.equals("true")) {
 return true; // ?jsp_precompile=true
 } else if (value.equals("false")) {
 // Spec says if jsp_precompile=false, the request should not
 // be delivered to the JSP page; the easiest way to implement
 // this is to set the flag to true, and precompile the page anyway.
 // This still conforms to the spec, since it says the
 // precompilation request can be ignored.
 return true; // ?jsp_precompile=false
 } else {
 throw new ServletException(Localizer.getMessage("jsp.error.precompilation.parameter",
 precompileParameter, value));
 }

 }

 @Override
 public void service (HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {

 // jspFile may be configured as an init-param for this servlet instance
 String jspUri = jspFile;

 if (jspUri == null) {
 /*
 * Check to see if the requested JSP has been the target of a
 * RequestDispatcher.include()
 */
 jspUri = (String) request.getAttribute(
 RequestDispatcher.INCLUDE_SERVLET_PATH);
 if (jspUri != null) {
 /*
 * Requested JSP has been target of
 * RequestDispatcher.include(). Its path is assembled from the
 * relevant jakarta.servlet.include.* request attributes
 */
 String pathInfo = (String) request.getAttribute(
 RequestDispatcher.INCLUDE_PATH_INFO);
 if (pathInfo != null) {
 jspUri += pathInfo;
 }
 } else {
 /*
 * Requested JSP has not been the target of a
 * RequestDispatcher.include(). Reconstruct its path from the
 * request's getServletPath() and getPathInfo()
 */
 jspUri = request.getServletPath();
 String pathInfo = request.getPathInfo();
 if (pathInfo != null) {
 jspUri += pathInfo;
 }
 }
 }

 if (log.isDebugEnabled()) {
 log.debug("JspEngine --> " + jspUri);
 log.debug("\t ServletPath: " + request.getServletPath());
 log.debug("\t PathInfo: " + request.getPathInfo());
 log.debug("\t RealPath: " + context.getRealPath(jspUri));
 log.debug("\t RequestURI: " + request.getRequestURI());
 log.debug("\t QueryString: " + request.getQueryString());
 }

 try {
 boolean precompile = preCompile(request);
 serviceJspFile(request, response, jspUri, precompile);
 } catch (RuntimeException | IOException | ServletException e) {
 throw e;
 } catch (Throwable e) {
 ExceptionUtils.handleThrowable(e);
 throw new ServletException(e);
 }

 }

 @Override
 public void destroy() {
 if (log.isDebugEnabled()) {
 log.debug("JspServlet.destroy()");
 }

 rctxt.destroy();
 }

 @Override
 public void periodicEvent() {
 rctxt.checkUnload();
 rctxt.checkCompile();
 }

 // -------------------------------------------------------- Private Methods

 private void serviceJspFile(HttpServletRequest request,
 HttpServletResponse response, String jspUri,
 boolean precompile)
 throws ServletException, IOException {

 JspServletWrapper wrapper = rctxt.getWrapper(jspUri);
 if (wrapper == null) {
 synchronized(this) {
 wrapper = rctxt.getWrapper(jspUri);
 if (wrapper == null) {
 // Check if the requested JSP page exists, to avoid
 // creating unnecessary directories and files.
 if (null == context.getResource(jspUri)) {
 handleMissingResource(request, response, jspUri);
 return;
 }
 wrapper = new JspServletWrapper(config, options, jspUri,
 rctxt);
 rctxt.addWrapper(jspUri,wrapper);
 }
 }
 }

 try {
 wrapper.service(request, response, precompile);
 } catch (FileNotFoundException fnfe) {
 handleMissingResource(request, response, jspUri);
 }

 }

 private void handleMissingResource(HttpServletRequest request,
 HttpServletResponse response, String jspUri)
 throws ServletException, IOException {

 String includeRequestUri =
 (String)request.getAttribute(RequestDispatcher.INCLUDE_REQUEST_URI);

 String msg = Localizer.getMessage("jsp.error.file.not.found",jspUri);
 if (includeRequestUri != null) {
 // This file was included. Throw an exception as
 // a response.sendError() will be ignored
 // Strictly, filtering this is an application
 // responsibility but just in case...
 throw new ServletException(Escape.htmlElementContent(msg));
 } else {
 try {
 response.sendError(HttpServletResponse.SC_NOT_FOUND, msg);
 } catch (IllegalStateException ise) {
 log.error(msg);
 }
 }
 }

}

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