/*

  * Copyright 2005-2008 The Kuali Foundation

  * 

  * 

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  * 

  * 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.kuali.rice.kew.web;

 import java.io.IOException;

 import javax.servlet.Filter;

 import javax.servlet.FilterChain;

 import javax.servlet.FilterConfig;

 import javax.servlet.ServletException;

 import javax.servlet.ServletRequest;

 import javax.servlet.ServletResponse;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletRequestWrapper;

 import org.kuali.rice.kew.web.session.UserSession;

 import org.kuali.rice.kim.bo.entity.KimPrincipal;

 import org.kuali.rice.kim.service.IdentityManagementService;

 import org.kuali.rice.kim.service.KIMServiceLocator;

 /**

  * A login filter which forwards to a login page that allows for the desired

  * authentication ID to be entered without the need for a password.

  *

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public class DummyLoginFilter implements Filter {

     private String loginPath;

     private boolean showPassword = false;

     public void init(FilterConfig config) throws ServletException {

         loginPath = config.getInitParameter("loginPath");

         showPassword = new Boolean(config.getInitParameter("showPassword"));

         if (loginPath == null) {

             loginPath = "/WEB-INF/jsp/dummy_login.jsp";

         }

     }

         public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

         if (request instanceof HttpServletRequest) {

             HttpServletRequest hsreq = (HttpServletRequest) request;

             UserSession session = null;

             if (UserLoginFilter.isUserSessionEstablished(hsreq)) {

                     session = UserLoginFilter.getUserSession(hsreq);        

             }

             if (session == null) {

                     IdentityManagementService auth = KIMServiceLocator.getIdentityManagementService();

                            request.setAttribute("showPasswordField", showPassword);

                 final String user = request.getParameter("__login_user");

                 final String password = request.getParameter("__login_pw");

                 if (user != null) {

                         // Very simple password checking. Nothing hashed or encrypted. This is strictly for demonstration purposes only.

                         final KimPrincipal principal = showPassword ? auth.getPrincipalByPrincipalNameAndPassword(user, password) : auth.getPrincipalByPrincipalName(user);

                         if (principal == null) {

                                 handleInvalidLogin(request, response);        

                                 return;

                         } else {

                         // wrap the request with the remote user

                         // UserLoginFilter and WebAuthenticationService will create the session

                         request = new HttpServletRequestWrapper(hsreq) {

                             public String getRemoteUser() {

                                 return user;

                             }

                         };        

                         }

                 } else {

                     // no session has been established and this is not a login form submission, so forward to login page

                     request.getRequestDispatcher(loginPath).forward(request, response);

                     return;

                 }

             }

         }

         chain.doFilter(request, response);

     }

         /**

          * Handles and invalid login attempt.

          *  

          * @param request the incoming request

          * @param response the outgoing response

          * @throws ServletException if unable to handle the invalid login

          * @throws IOException if unable to handle the invalid login

          */

         private void handleInvalidLogin(ServletRequest request, ServletResponse response) throws ServletException, IOException {

                 request.setAttribute("invalidAuth", Boolean.TRUE);

                 request.getRequestDispatcher(loginPath).forward(request, response);

         }

     public void destroy() {

     }

 }