FilterServlet.java

/*
 * Copyright (c) 2001-2010 Oracle and/or its affiliates. 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 Oracle 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);
    }
}