/**

  * 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.edl.impl.components;

 import org.apache.commons.lang.StringUtils;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import org.kuali.rice.edl.impl.EDLContext;

 import org.kuali.rice.edl.impl.EDLModelComponent;

 import org.kuali.rice.edl.impl.EDLXmlUtils;

 import org.kuali.rice.edl.impl.RequestParser;

 import org.w3c.dom.Document;

 import org.w3c.dom.Element;

 /**

  * Handles setting the request browser type in the EDL XML.

  *

  * @author Kuali Rice Team (kuali-rice@googlegroups.com)

  *

  */

 public class BrowserHandler implements EDLModelComponent {

         private static final Log LOG = LogFactory.getLog(BrowserHandler.class);

         public static final String BROWSER_EL = "requestBrowser";

         public void updateDOM(Document dom, Element configElement, EDLContext edlContext) {

             String userAgent = browserString(edlContext.getRequestParser());

             setBrowser(dom, uaConvert(userAgent));

         }

         /**

          * get user-agent header

          */

         private String browserString(RequestParser requestParser) {

             return requestParser.getRequest().getHeader("User-Agent");

         }

         private void setBrowser(Document dom, String bStr) {

             if (!StringUtils.isBlank(bStr)) {

                     Element currentPageElement = EDLXmlUtils.getOrCreateChildElement(dom.getDocumentElement(), BROWSER_EL, true);

                     currentPageElement.appendChild(dom.createTextNode(bStr));

                     if (LOG.isDebugEnabled()) {

                             LOG.debug("Appended" + bStr + " to XML field " + currentPageElement.getNodeName());

                     }

             }

         }

         private String uaConvert(String userAgent){

             String res = userAgent;

             int ie = userAgent.indexOf("MSIE");

             int ff = userAgent.indexOf("Firefox/");

             int saf = userAgent.indexOf("Safari/");

             int chr = userAgent.indexOf("Chrome/");

             if(ie>0){

                 res = "InternetExplorer";

             }else if(ff > 0){

                 res = "Firefox";

             }else if(saf > 0 && chr < 0){

                 res = "Safari";

             }else if(saf > 0 && chr > 0){

             res = "Chrome";

             }else{

                 res = "Other";

             }            

             return res;

         }

 }