/*

  * 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.

  */

 package org.apache.shiro.samples.spring.web;

 import java.util.HashMap;

 import java.util.Map;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import org.springframework.web.servlet.ModelAndView;

 import org.springframework.web.servlet.mvc.AbstractController;

 import org.apache.shiro.SecurityUtils;

 import org.apache.shiro.session.Session;

 import org.apache.shiro.subject.Subject;

 /**

  * Controller used to dynamically build a JNLP file used to launch the Shiro

  * Spring WebStart sample application.

  *

  * @since 0.1

  */

 public class JnlpController extends AbstractController {

     /*--------------------------------------------

     |             C O N S T A N T S             |

     ============================================*/

     /*--------------------------------------------

     |    I N S T A N C E   V A R I A B L E S    |

     ============================================*/

     private String jnlpView;

     /*--------------------------------------------

     |         C O N S T R U C T O R S           |

     ============================================*/

     /*--------------------------------------------

     |  A C C E S S O R S / M O D I F I E R S    |

     ============================================*/

     public void setJnlpView(String jnlpView) {

         this.jnlpView = jnlpView;

     }

     /*--------------------------------------------

     |               M E T H O D S               |

     ============================================*/

     protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception {

         Subject subject = SecurityUtils.getSubject();

         Session session = null;

         if (subject != null) {

             session = subject.getSession();

         }

         if (session == null) {

             String msg = "Expected a non-null Shiro session.";

             throw new IllegalArgumentException(msg);

         }

         StringBuilder sb = new StringBuilder();

         sb.append("http://");

         sb.append(request.getServerName());

         if (request.getServerPort() != 80) {

             sb.append(":");

             sb.append(request.getServerPort());

         }

         sb.append(request.getContextPath());

         // prevent JNLP caching by setting response headers

         response.setHeader("cache-control", "no-cache");

         response.setHeader("pragma", "no-cache");

         Map<String, Object> model = new HashMap<String, Object>();

         model.put("codebaseUrl", sb.toString());

         model.put("sessionId", session.getId());

         return new ModelAndView(jnlpView, model);

     }

 }