/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. The ASF licenses this file to You
* under the Apache 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.apache.org/licenses/LICENSE-2.0
*
* 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. For additional information regarding
* copyright in this work, please see the NOTICE file in the top level
* directory of this distribution.
*/
package org.apache.roller.planet.ui.rendering.servlets;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.roller.planet.PlanetException;
import org.apache.roller.planet.config.PlanetConfig;
import org.apache.roller.planet.pojos.Planet;
import org.apache.roller.planet.pojos.PlanetGroup;
import org.apache.roller.planet.pojos.StaticTemplate;
import org.apache.roller.planet.pojos.Template;
import org.apache.roller.planet.ui.rendering.Renderer;
import org.apache.roller.planet.ui.rendering.RendererManager;
import org.apache.roller.planet.ui.rendering.model.ModelLoader;
import org.apache.roller.planet.ui.rendering.util.PlanetGroupFeedRequest;
/**
* Responsible for rendering weblog feeds.
*/
public class FeedServlet extends HttpServlet {
private static Log log = LogFactory.getLog(FeedServlet.class);
/**
* Init method for this servlet
*/
public void init(ServletConfig servletConfig) throws ServletException {
super.init(servletConfig);
log.info("Initializing FeedServlet");
}
/**
* Handle GET requests for weblog feeds.
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
log.debug("Entering");
Planet planet = null;
PlanetGroup group = null;
PlanetGroupFeedRequest feedRequest = null;
try {
// parse the incoming request and extract the relevant data
feedRequest = new PlanetGroupFeedRequest(request);
planet = feedRequest.getPlanet();
if(planet == null) {
throw new PlanetException("unable to lookup planet: "+
feedRequest.getPlanetHandle());
}
group = feedRequest.getGroup();
if(group == null) {
throw new PlanetException("unable to lookup group: "+
feedRequest.getGroupHandle());
}
} catch(Exception e) {
// invalid feed request format or weblog doesn't exist
log.debug("error creating weblog feed request", e);
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
// set content type
String accepts = request.getHeader("Accept");
String userAgent = request.getHeader("User-Agent");
if (accepts != null && accepts.indexOf("*/*") != -1 &&
userAgent != null && userAgent.startsWith("Mozilla")) {
// client is a browser and feed style is enabled so we want
// browsers to load the page rather than popping up the download
// dialog, so we provide a content-type that browsers will display
response.setContentType("text/xml");
} else if("rss".equals(feedRequest.getFormat())) {
response.setContentType("application/rss+xml; charset=utf-8");
} else if("atom".equals(feedRequest.getFormat())) {
response.setContentType("application/atom+xml; charset=utf-8");
}
// looks like we need to render content
HashMap model = new HashMap();
try {
// populate the rendering model
Map initData = new HashMap();
initData.put("planetRequest", feedRequest);
// Load models for feeds
String feedModels = PlanetConfig.getProperty("rendering.feedModels");
ModelLoader.loadModels(feedModels, model, initData, true);
} catch (PlanetException ex) {
log.error("ERROR loading model for page", ex);
if(!response.isCommitted()) response.reset();
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
return;
}
// lookup Renderer we are going to use
Renderer renderer = null;
try {
log.debug("Looking up renderer");
String templateFile = null;
if("rss".equals(feedRequest.getFormat())) {
templateFile = "group-rss.vm";
} else if("atom".equals(feedRequest.getFormat())) {
templateFile = "group-atom.vm";
}
Template template = new StaticTemplate(templateFile, null, "velocity");
renderer = RendererManager.getRenderer(template);
} catch(Exception e) {
// nobody wants to render my content :(
if(!response.isCommitted()) response.reset();
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
// render content. use default size of about 24K for a standard page
try {
log.debug("Doing rendering");
renderer.render(model, response.getWriter());
} catch(Exception e) {
// bummer, error during rendering
log.error("Error during rendering for group-atom.vm", e);
if(!response.isCommitted()) response.reset();
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
// post rendering process
// flush rendered content to response
log.debug("Flushing response output");
//response.setContentLength(rendererOutput.getContent().length);
//response.getOutputStream().write(rendererOutput.getContent());
log.debug("Exiting");
}
}