/**

  * Copyright 2005-2011 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.routing.web;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import org.apache.commons.lang.StringUtils;

 import org.apache.struts.action.ActionForm;

 import org.apache.struts.action.ActionForward;

 import org.apache.struts.action.ActionMapping;

 import org.kuali.rice.kew.api.WorkflowRuntimeException;

 import org.kuali.rice.kew.doctype.SecuritySession;

 import org.kuali.rice.kew.doctype.bo.DocumentType;

 import org.kuali.rice.kew.doctype.service.DocumentTypeService;

 import org.kuali.rice.kew.routeheader.DocumentRouteHeaderValue;

 import org.kuali.rice.kew.routeheader.service.RouteHeaderService;

 import org.kuali.rice.kew.service.KEWServiceLocator;

 import org.kuali.rice.kew.api.KewApiConstants;

 import org.kuali.rice.kew.web.KewKualiAction;

 import org.kuali.rice.krad.UserSession;

 import org.kuali.rice.krad.util.GlobalVariables;

 /**

  * A Struts Action for redirecting from the KEW web application to the appropriate

  * Doc Handler for a document.

  *

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

  */

 public class ClientAppDocHandlerRedirectAction extends KewKualiAction {

     @Override

         public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {

         DocHandlerForm docHandlerForm = (DocHandlerForm) form;

         String docHandler = null;

         if (request.getParameter(KewApiConstants.DOCUMENT_ID_PARAMETER) != null) {

             RouteHeaderService rhSrv = (RouteHeaderService) KEWServiceLocator.getService(KEWServiceLocator.DOC_ROUTE_HEADER_SRV);

             DocumentRouteHeaderValue routeHeader = rhSrv.getRouteHeader(docHandlerForm.getDocId());

             if (!KEWServiceLocator.getDocumentSecurityService().routeLogAuthorized(GlobalVariables.getUserSession().getPrincipalId(), routeHeader, new SecuritySession(GlobalVariables.getUserSession().getPrincipalId()))) {

                     return mapping.findForward("NotAuthorized");

             }

             docHandler = routeHeader.getDocumentType().getDocHandlerUrl();

             if (StringUtils.isBlank(docHandler)) {

                 throw new WorkflowRuntimeException("Document Type '" + routeHeader.getDocumentType().getName() + "' does not have a document handler url set (attempted to open document handler url for document id " + routeHeader.getDocumentId() + ")");

             }

             if (!docHandler.contains("?")) {

                 docHandler += "?";

             } else {

                 docHandler += "&";

             }

             docHandler += KewApiConstants.DOCUMENT_ID_PARAMETER + "=" + docHandlerForm.getDocId();

         } else if (request.getParameter(KewApiConstants.DOCTYPE_PARAMETER) != null) {

             DocumentTypeService documentTypeService = (DocumentTypeService) KEWServiceLocator.getService(KEWServiceLocator.DOCUMENT_TYPE_SERVICE);

             DocumentType documentType = documentTypeService.findByName(docHandlerForm.getDocTypeName());

             docHandler = documentType.getDocHandlerUrl();

             if (StringUtils.isBlank(docHandler)) {

                 throw new WorkflowRuntimeException("Cannot find document handler url for document type '" + documentType.getName() + "'");

             }

             if (!docHandler.contains("?")) {

                 docHandler += "?";

             } else {

                 docHandler += "&";

             }

             docHandler += KewApiConstants.DOCTYPE_PARAMETER + "=" + docHandlerForm.getDocTypeName();

         } else {

 //TODO what should happen here if parms are missing; no proper ActionForward from here

             throw new RuntimeException ("Cannot determine document handler");

         }

         docHandler += "&" + KewApiConstants.COMMAND_PARAMETER + "=" + docHandlerForm.getCommand();

         if (getUserSession(request).isBackdoorInUse()) {

             docHandler += "&" + KewApiConstants.BACKDOOR_ID_PARAMETER + "=" + getUserSession(request).getPrincipalName();

         }

         return new ActionForward(docHandler, true);

     }

     public static UserSession getUserSession(HttpServletRequest request) {

         return GlobalVariables.getUserSession();

     }

 }