filterservlet.java

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/*
 * @(#)FilterServlet.java	1.4 07/07/06
 *
 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Sun Microsystems nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package demo;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

/**
 * This servlet is used to determine whether the user is logged in before
 * forwarding the request to the selected URL.
 */
public class FilterServlet extends HttpServlet {

    /**
     * This method handles the "POST" submission from two forms: the
     * login form and the message compose form.
     */
    public void doPost(HttpServletRequest request, 
                       HttpServletResponse  response) 
                       throws IOException, ServletException {

        String servletPath = request.getServletPath();
        servletPath = servletPath.concat(".jsp");
        
        getServletConfig().getServletContext().
            getRequestDispatcher("/" + servletPath).forward(request, response);
    }

    /**
     * This method handles the GET requests from the client.
     */
    public void doGet(HttpServletRequest request, 
                      HttpServletResponse  response)
                      throws IOException, ServletException {
      
        // check to be sure we're still logged in 
        // before forwarding the request.
        HttpSession session = request.getSession();
        MailUserBean mailuser = (MailUserBean)session.getAttribute("mailuser");
        String servletPath = request.getServletPath();
        servletPath = servletPath.concat(".jsp");
        
        if (mailuser.isLoggedIn())
            getServletConfig().getServletContext().
                getRequestDispatcher("/" + servletPath).
                forward(request, response);
        else
            getServletConfig().getServletContext().
                getRequestDispatcher("/index.html").
                forward(request, response);
    }
}