/*

  * Copyright 2007-2008 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.ken.web.spring;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import org.apache.log4j.Logger;

 import org.kuali.rice.ken.service.NotificationAuthorizationService;

 import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

 /**

  * Spring HandlerInterceptor implementation that implements security.  For now this just

  * adds a flag to the request indicating whether the authenticated user is a Notification

  * System administrator.

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

  */

 public class SecurityInterceptor extends HandlerInterceptorAdapter {

     private static final Logger LOG = Logger.getLogger(SecurityInterceptor.class);

     /**

      * Request attribute key under which to register the userIsAdmin flag

      */

     private static final String USER_IS_ADMIN_KEY = "userIsAdmin";

     protected NotificationAuthorizationService notificationAuthzService;

     /**

      * Sets the NotificationAuthorizationService member

      * @param notificationAuthzService NotificationAuthorizationService used to determine whether user is administrator

      */

     public void setNotificationAuthorizationService(NotificationAuthorizationService notificationAuthzService) {

         this.notificationAuthzService = notificationAuthzService;

     }

     /**

      * Decorate the incoming request with an attribute that indicates whether the user is a Notification System administrator

      * @see org.springframework.web.servlet.handler.HandlerInterceptorAdapter#preHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object)

      */

     @Override

     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

         String user = request.getRemoteUser();

         boolean isAdmin = false;

         if (user != null) {

             isAdmin = notificationAuthzService.isUserAdministrator(user);

         }

         LOG.debug("Setting request attribute '" + USER_IS_ADMIN_KEY + "' to " + isAdmin);

         request.setAttribute(USER_IS_ADMIN_KEY, Boolean.valueOf(isAdmin));

         return true;

     }

 }