/*
* 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.
*/

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import java.util.Locale;
import java.util.ResourceBundle;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import util.CookieFilter;
import util.HTMLFilter;

/**
 * Example servlet showing request headers
 *
 * @author James Duncan Davidson <duncan@eng.sun.com>
 */

public class RequestHeaderExample extends HttpServlet {

    private static final long serialVersionUID = 1L;

    private static final ResourceBundle RB = ResourceBundle.getBundle("LocalStrings");

    @Override
    public void doGet(HttpServletRequest request,
                      HttpServletResponse response)
        throws IOException, ServletException
    {
        response.setContentType("text/html");

        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<head>");

        String title = RB.getString("requestheader.title");
        out.println("<title>" + title + "</title>");
        out.println("</head>");
        out.println("<body bgcolor=\"white\">");

        // all links relative

        // XXX
        // making these absolute till we work out the
        // addition of a PathInfo issue

        out.println("<a href=\"../reqheaders.html\">");
        out.println("<img src=\"../images/code.gif\" height=24 " +
                    "width=24 align=right border=0 alt=\"view code\"></a>");
        out.println("<a href=\"../index.html\">");
        out.println("<img src=\"../images/return.gif\" height=24 " +
                    "width=24 align=right border=0 alt=\"return\"></a>");

        out.println("<h3>" + title + "</h3>");
        out.println("<table border=0>");
        Enumeration<String> e = request.getHeaderNames();
        while (e.hasMoreElements()) {
            String headerName = e.nextElement();
            String headerValue = request.getHeader(headerName);
            out.println("<tr><td bgcolor=\"#CCCCCC\">");
            out.println(HTMLFilter.filter(headerName));
            out.println("</td><td>");
            if (headerName.toLowerCase(Locale.ENGLISH).contains("cookie")) {
                HttpSession session = request.getSession(false);
                String sessionId = null;
                if (session != null) {
                    sessionId = session.getId();
                }
                out.println(HTMLFilter.filter(CookieFilter.filter(headerValue, sessionId)));
            } else {
                out.println(HTMLFilter.filter(headerValue));
            }
            out.println("</td></tr>");
        }
        out.println("</table>");
    }

    @Override
    public void doPost(HttpServletRequest request,
                      HttpServletResponse response)
        throws IOException, ServletException
    {
        doGet(request, response);
    }

}