/**
    * Copyright 2005-2012 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.kns.web.struts.action;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.struts.Globals;
  import org.apache.struts.action.Action;
  import org.apache.struts.action.ActionForm;
  import org.apache.struts.action.ActionForward;
  import org.apache.struts.action.ActionMapping;
  import org.kuali.rice.core.api.util.RiceConstants;
  import org.kuali.rice.krad.util.KRADConstants;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * This is the struts action class for handling the exception for Kuali
   * applications.
   * 
   */
  public class AuthorizationExceptionAction extends Action {
      
      private static final String MESSAGE_FIELD = "message";
      
      private static final Log LOG = LogFactory.getLog(AuthorizationExceptionAction.class);
  
      /**
       * Dispatches action to be taken during an AuthorizationException.
       * 
       * @see org.apache.struts.action.Action#execute(
       *      org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, 
       *      javax.servlet.http.HttpServletResponse)
       */
      @Override
      public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
          if (LOG.isDebugEnabled()) {
              LOG.debug(String.format("ENTRY %s%n%s", form.getClass().getSimpleName(), request.getRequestURI()));
          }
          
          ActionForward forward = null;
  
          Throwable t = (Throwable) request.getAttribute(Globals.EXCEPTION_KEY);
  
          if (t == null) {
              forward = mapping.findForward(KRADConstants.MAPPING_CLOSE);
          } else {
              forward = processException(mapping, form, request, t);
          }
          
          if (LOG.isDebugEnabled()) {
              LOG.debug(String.format("EXIT %s", (forward == null) ? "null" : forward.getPath()));
          }
  
          return forward;
      }
      
      private ActionForward processException(ActionMapping mapping, ActionForm form, HttpServletRequest request, Throwable t) throws Exception {
          Map<String, String> properties = new HashMap<String, String>();
          properties.put(MESSAGE_FIELD, t.getMessage());
  
          request.setAttribute(AuthorizationExceptionAction.class.getName(), properties);
          
          return mapping.findForward(RiceConstants.MAPPING_BASIC);
      }
  
  }