/**
* Copyright (C) Gadglet .
*
* This file is part of Gadglet
*
* Gadglet is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Gadglet is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Gadglet. If not, see <http://www.gnu.org/licenses/>.
*/
package com.gadglet.filters;
import java.io.IOException;
import java.io.PrintWriter;
import javax.jdo.PersistenceManager;
import javax.jdo.Query;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import com.gadglet.data.Gadget;
import com.gadglet.data.utils.PMF;
import com.gadglet.util.UrlUtils;
// Seems not to work when static resource exists ... TBD- check!
public class GadgetsProvider implements javax.servlet.Filter {
public FilterConfig filterConfig;
@Override
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest httpReq = null;
String gadgetName = null;
boolean continueRequest = true;
// handle XML ignore all other requests ...
// As the system has a webserver in front the filter is invoked only for
// resources that doesn't exist (error 404) or JSP or /dir/ (no file name)
// The Filer is invoked ONLY for xml requests that stored in the DataStore
if (request instanceof HttpServletRequest)
{
httpReq = (HttpServletRequest) request;
//System.out.print("getServletPath = "+ httpReq.getServletPath());
// check for xml request
if(UrlUtils.isXmlRequest(httpReq.getServletPath()))
{
gadgetName = UrlUtils.getGadgetName(httpReq.getServletPath());
if(gadgetName != null)
{
// load gadget xml and send back
// call the gadget xml
PersistenceManager pm = PMF.get().getPersistenceManager();
Query query = pm.newQuery(Gadget.class);
query.setFilter("name == nameParam");
query.declareParameters("String nameParam");
try
{
query.setUnique(true); //solve the one gadget issue
Gadget g = (Gadget) query.execute(gadgetName);
if (g!=null ) // ignore g.isVisible() as the igoogle call doesn't include credentials
{
// XML file exists on server
if(g.getGadgetFileName() != null && !g.getGadgetFileName().isEmpty())
continueRequest = true;
else
{
// XML in DataStore
PrintWriter out = response.getWriter();
response.setContentType("text/xml; charset=UTF-8");
out.print(g.getXmlSource());
continueRequest = false;
}
}
}
catch (Exception e)
{
e.printStackTrace();
}
finally
{
query.closeAll();
pm.close();
}
}
else
continueRequest = false;
}
else
continueRequest = true;
}
// perform the request
if(continueRequest)
chain.doFilter(request,response);
}
@Override
public void init(FilterConfig conf) throws ServletException {
this.filterConfig = conf;
}
}