/*
* 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.weblogger.ui.rendering.servlets;
import java.io.IOException;
import java.util.HashMap;
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.weblogger.WebloggerException;
import org.apache.roller.weblogger.config.WebloggerRuntimeConfig;
import org.apache.roller.weblogger.pojos.StaticTemplate;
import org.apache.roller.weblogger.pojos.Template;
import org.apache.roller.weblogger.pojos.Weblog;
import org.apache.roller.weblogger.ui.rendering.util.WeblogRequest;
import org.apache.roller.weblogger.ui.rendering.util.ModDateHeaderUtil;
import org.apache.roller.weblogger.ui.rendering.Renderer;
import org.apache.roller.weblogger.ui.rendering.RendererManager;
import org.apache.roller.weblogger.util.cache.CachedContent;
/**
* Generates simple rsd feed for a given weblog.
*
* This servlet supports 304 If-Modified-Since checking, but does not do any
* level of content caching.
*
* @web.servlet name="RSDServlet" load-on-startup="7"
* @web.servlet-mapping url-pattern="/roller-ui/rendering/rsd/*"
*/
public class RSDServlet extends HttpServlet {
private static Log log = LogFactory.getLog(RSDServlet.class);
/**
* Init method for this servlet
*/
public void init(ServletConfig servletConfig) throws ServletException {
super.init(servletConfig);
log.info("Initializing RSDServlet");
}
/**
* Handle GET requests for weblog pages.
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
log.debug("Entering");
Weblog weblog = null;
WeblogRequest weblogRequest = null;
try {
weblogRequest = new WeblogRequest(request);
// now make sure the specified weblog really exists
weblog = weblogRequest.getWeblog();
if(weblog == null) {
throw new WebloggerException("Unable to lookup weblog: "+
weblogRequest.getWeblogHandle());
}
} catch(Exception e) {
// invalid rsd request format or weblog doesn't exist
log.debug("error creating weblog request", e);
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
// Respond with 304 Not Modified if it is not modified.
long lastModified = System.currentTimeMillis();
if (weblog.getLastModified() != null) {
lastModified = weblog.getLastModified().getTime();
}
if (ModDateHeaderUtil.respondIfNotModified(request,response,lastModified)) {
return;
}
// set last-modified date
ModDateHeaderUtil.setLastModifiedHeader(response,lastModified);
// set the content type
response.setContentType("application/rsd+xml; charset=utf-8");
// populate the model
HashMap model = new HashMap();
model.put("website", weblog);
model.put("absBaseURL", WebloggerRuntimeConfig.getAbsoluteContextURL());
// lookup Renderer we are going to use
Renderer renderer = null;
try {
log.debug("Looking up renderer");
Template template = new StaticTemplate("templates/weblog/rsd.vm", "velocity");
renderer = RendererManager.getRenderer(template);
} catch(Exception e) {
// nobody wants to render my content :(
log.error("Couldn't find renderer for rsd template", e);
if(!response.isCommitted()) response.reset();
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
// render content
CachedContent rendererOutput = new CachedContent(4096);
try {
log.debug("Doing rendering");
renderer.render(model, rendererOutput.getCachedWriter());
// flush rendered output and close
rendererOutput.flush();
rendererOutput.close();
} catch(Exception e) {
// bummer, error during rendering
log.error("Error during rendering for rsd template", 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");
}
}