| /* |
| * 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.util.RollerConstants; |
| 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.TemplateRendition.TemplateLanguage; |
| 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.ui.rendering.mobile.MobileDeviceRepository.DeviceType; |
| import org.apache.roller.weblogger.util.cache.CachedContent; |
| |
| /** |
| * Generates Really Simple Discovery (RSD) listing for a given weblog allowing |
| * blog writing clients to see API services provided by Roller. The list of |
| * services is maintained in Roller velocity file rsd.vm. |
| * |
| * Spec: http://cyber.law.harvard.edu/blogs/gems/tech/rsd.html |
| * |
| * This servlet supports 304 If-Modified-Since checking, but does not do any |
| * level of content caching. |
| */ |
| public class RSDServlet extends HttpServlet { |
| |
| private static Log log = LogFactory.getLog(RSDServlet.class); |
| |
| /** |
| * Init method for this servlet |
| */ |
| @Override |
| public void init(ServletConfig servletConfig) throws ServletException { |
| |
| super.init(servletConfig); |
| |
| log.info("Initializing RSDServlet"); |
| } |
| |
| /** |
| * Handle GET requests for weblog pages. |
| */ |
| @Override |
| public void doGet(HttpServletRequest request, HttpServletResponse response) |
| throws ServletException, IOException { |
| |
| log.debug("Entering"); |
| Weblog weblog; |
| WeblogRequest weblogRequest; |
| |
| 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, weblogRequest.getDeviceType())) { |
| return; |
| } |
| |
| // set last-modified date |
| ModDateHeaderUtil.setLastModifiedHeader(response, lastModified, |
| weblogRequest.getDeviceType()); |
| |
| // set the content type |
| response.setContentType("application/rsd+xml; charset=utf-8"); |
| |
| // populate the model |
| HashMap<String, Object> model = new HashMap<String, Object>(); |
| model.put("website", weblog); |
| model.put("absBaseURL", WebloggerRuntimeConfig.getAbsoluteContextURL()); |
| |
| // lookup Renderer we are going to use |
| Renderer renderer; |
| try { |
| log.debug("Looking up renderer"); |
| Template template = new StaticTemplate("weblog/rsd.vm", TemplateLanguage.VELOCITY); |
| renderer = RendererManager.getRenderer(template, |
| DeviceType.standard); |
| } 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(RollerConstants.FOUR_KB_IN_BYTES); |
| 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"); |
| } |
| |
| } |