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java/org/apache/catalina/ssi/SSIServlet.java
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226
java/org/apache/catalina/ssi/SSIServlet.java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.catalina.ssi;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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import java.net.URL;
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import java.net.URLConnection;
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import java.util.Locale;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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/**
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* Servlet to process SSI requests within a webpage. Mapped to a path from
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* within web.xml.
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*
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* @author Bip Thelin
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* @author Amy Roh
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* @author Dan Sandberg
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* @author David Becker
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*/
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public class SSIServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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/** Debug level for this servlet. */
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protected int debug = 0;
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/** Should the output be buffered. */
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protected boolean buffered = false;
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/** Expiration time in seconds for the doc. */
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protected Long expires = null;
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/** virtual path can be webapp-relative */
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protected boolean isVirtualWebappRelative = false;
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/** Input encoding. If not specified, uses platform default */
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protected String inputEncoding = null;
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/** Output encoding. If not specified, uses platform default */
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protected String outputEncoding = "UTF-8";
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/** Allow exec (normally blocked for security) */
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protected boolean allowExec = false;
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//----------------- Public methods.
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/**
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* Initialize this servlet.
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*
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* @exception ServletException
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* if an error occurs
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*/
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@Override
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public void init() throws ServletException {
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if (getServletConfig().getInitParameter("debug") != null)
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debug = Integer.parseInt(getServletConfig().getInitParameter("debug"));
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isVirtualWebappRelative =
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Boolean.parseBoolean(getServletConfig().getInitParameter("isVirtualWebappRelative"));
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if (getServletConfig().getInitParameter("expires") != null)
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expires = Long.valueOf(getServletConfig().getInitParameter("expires"));
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buffered = Boolean.parseBoolean(getServletConfig().getInitParameter("buffered"));
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inputEncoding = getServletConfig().getInitParameter("inputEncoding");
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if (getServletConfig().getInitParameter("outputEncoding") != null)
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outputEncoding = getServletConfig().getInitParameter("outputEncoding");
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allowExec = Boolean.parseBoolean(
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getServletConfig().getInitParameter("allowExec"));
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if (debug > 0)
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log("SSIServlet.init() SSI invoker started with 'debug'=" + debug);
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}
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/**
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* Process and forward the GET request to our <code>requestHandler()</code>*
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*
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* @param req
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* a value of type 'HttpServletRequest'
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* @param res
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* a value of type 'HttpServletResponse'
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* @exception IOException
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* if an error occurs
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* @exception ServletException
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* if an error occurs
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*/
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@Override
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public void doGet(HttpServletRequest req, HttpServletResponse res)
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throws IOException, ServletException {
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if (debug > 0) log("SSIServlet.doGet()");
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requestHandler(req, res);
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}
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/**
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* Process and forward the POST request to our
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* <code>requestHandler()</code>.
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*
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* @param req
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* a value of type 'HttpServletRequest'
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* @param res
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* a value of type 'HttpServletResponse'
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* @exception IOException
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* if an error occurs
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* @exception ServletException
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* if an error occurs
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*/
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@Override
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public void doPost(HttpServletRequest req, HttpServletResponse res)
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throws IOException, ServletException {
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if (debug > 0) log("SSIServlet.doPost()");
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requestHandler(req, res);
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}
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/**
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* Process our request and locate right SSI command.
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*
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* @param req
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* a value of type 'HttpServletRequest'
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* @param res
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* a value of type 'HttpServletResponse'
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* @throws IOException an IO error occurred
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*/
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protected void requestHandler(HttpServletRequest req,
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HttpServletResponse res) throws IOException {
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ServletContext servletContext = getServletContext();
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String path = SSIServletRequestUtil.getRelativePath(req);
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if (debug > 0)
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log("SSIServlet.requestHandler()\n" + "Serving "
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+ (buffered?"buffered ":"unbuffered ") + "resource '"
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+ path + "'");
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// Exclude any resource in the /WEB-INF and /META-INF subdirectories
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// (the "toUpperCase()" avoids problems on Windows systems)
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if (path == null || path.toUpperCase(Locale.ENGLISH).startsWith("/WEB-INF")
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|| path.toUpperCase(Locale.ENGLISH).startsWith("/META-INF")) {
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res.sendError(HttpServletResponse.SC_NOT_FOUND, path);
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log("Can't serve file: " + path);
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return;
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}
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URL resource = servletContext.getResource(path);
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if (resource == null) {
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res.sendError(HttpServletResponse.SC_NOT_FOUND, path);
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log("Can't find file: " + path);
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return;
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}
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String resourceMimeType = servletContext.getMimeType(path);
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if (resourceMimeType == null) {
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resourceMimeType = "text/html";
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}
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res.setContentType(resourceMimeType + ";charset=" + outputEncoding);
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if (expires != null) {
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res.setDateHeader("Expires", (new java.util.Date()).getTime()
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+ expires.longValue() * 1000);
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}
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processSSI(req, res, resource);
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}
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protected void processSSI(HttpServletRequest req, HttpServletResponse res,
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URL resource) throws IOException {
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SSIExternalResolver ssiExternalResolver =
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new SSIServletExternalResolver(getServletContext(), req, res,
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isVirtualWebappRelative, debug, inputEncoding);
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SSIProcessor ssiProcessor = new SSIProcessor(ssiExternalResolver,
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debug, allowExec);
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PrintWriter printWriter = null;
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StringWriter stringWriter = null;
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if (buffered) {
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stringWriter = new StringWriter();
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printWriter = new PrintWriter(stringWriter);
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} else {
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printWriter = res.getWriter();
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}
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URLConnection resourceInfo = resource.openConnection();
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InputStream resourceInputStream = resourceInfo.getInputStream();
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String encoding = resourceInfo.getContentEncoding();
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if (encoding == null) {
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encoding = inputEncoding;
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}
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InputStreamReader isr;
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if (encoding == null) {
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isr = new InputStreamReader(resourceInputStream);
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} else {
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isr = new InputStreamReader(resourceInputStream, encoding);
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}
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BufferedReader bufferedReader = new BufferedReader(isr);
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long lastModified = ssiProcessor.process(bufferedReader,
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resourceInfo.getLastModified(), printWriter);
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if (lastModified > 0) {
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res.setDateHeader("last-modified", lastModified);
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}
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if (buffered) {
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printWriter.flush();
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@SuppressWarnings("null")
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String text = stringWriter.toString();
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res.getWriter().write(text);
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}
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bufferedReader.close();
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}
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}
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