/*
    * Copyright 2007 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 1.0 (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/ecl1.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 java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.struts.action.ActionForm;
  import org.apache.struts.action.ActionForward;
  import org.apache.struts.action.ActionMapping;
  import org.kuali.rice.core.config.ConfigContext;
  import org.kuali.rice.kns.exception.KualiException;
  import org.kuali.rice.kns.util.KNSConstants;
  
  /**
   * This is the action for the portal.
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class KualiPortalAction extends KualiSimpleAction {
  
      @Override
      public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
  
          String gotoUrl = null;
          String selectedTab = null;
  
          if (request.getQueryString() != null && request.getQueryString().indexOf("channelUrl") >= 0) {
              gotoUrl = request.getQueryString().substring(request.getQueryString().indexOf("channelUrl") + 11, request.getQueryString().length());
          } else if (request.getParameter("channelUrl") != null && request.getParameter("channelUrl").length() > 0) {
              gotoUrl = request.getParameter("channelUrl");
          }
          
          if (gotoUrl != null) {
              // encode some characters for security purposes if present in url
              gotoUrl = gotoUrl.replace(">", "%3E");
              gotoUrl = gotoUrl.replace("<", "%3C");
              gotoUrl = gotoUrl.replace("\"", "%22");
          
              // check url allowed to display in portal
              Pattern pattern = Pattern.compile(ConfigContext.getCurrentContextConfig().getProperty(KNSConstants.PORTAL_ALLOWED_REGEX));
              Matcher matcher = pattern.matcher(gotoUrl);
              if(!matcher.matches()) {
                  throw new KualiException("The requested channel URL is not authorized for display in portal.");
              }
          }
  
          if (request.getParameter("selectedTab") != null && request.getParameter("selectedTab").length() > 0) {
              request.getSession().setAttribute("selectedTab", request.getParameter("selectedTab"));
          }
  
          request.setAttribute("gotoUrl", gotoUrl);
  
          return super.execute(mapping, form, request, response);
      }
  
  }