| /* |
| * 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 org.apache.roller.util.RollerConstants; |
| import org.apache.roller.weblogger.pojos.Weblog; |
| import org.apache.roller.weblogger.pojos.Theme; |
| import org.apache.roller.weblogger.pojos.WeblogTheme; |
| import org.apache.roller.weblogger.pojos.Template; |
| import org.apache.roller.weblogger.pojos.ThemeTemplate.ComponentType; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.roller.weblogger.WebloggerException; |
| import org.apache.roller.weblogger.business.WebloggerFactory; |
| import org.apache.roller.weblogger.config.WebloggerConfig; |
| import org.apache.roller.weblogger.config.WebloggerRuntimeConfig; |
| import org.apache.roller.weblogger.ui.core.RollerContext; |
| import org.apache.roller.weblogger.ui.rendering.Renderer; |
| import org.apache.roller.weblogger.ui.rendering.RendererManager; |
| import org.apache.roller.weblogger.ui.rendering.model.ModelLoader; |
| import org.apache.roller.weblogger.ui.rendering.util.WeblogPreviewRequest; |
| import org.apache.roller.weblogger.util.cache.CachedContent; |
| |
| import javax.servlet.ServletConfig; |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import javax.servlet.jsp.JspFactory; |
| import javax.servlet.jsp.PageContext; |
| import java.io.IOException; |
| import java.util.HashMap; |
| import java.util.Map; |
| import org.apache.roller.weblogger.ui.rendering.mobile.MobileDeviceRepository; |
| |
| |
| /** |
| * Responsible for rendering weblog page previews. |
| * |
| * This servlet is used as part of the authoring interface to provide previews |
| * of what a weblog will look like with a given theme. It is not available |
| * outside of the authoring interface. |
| */ |
| public class PreviewServlet extends HttpServlet { |
| |
| private static Log log = LogFactory.getLog(PreviewServlet.class); |
| |
| |
| /** |
| * Init method for this servlet |
| */ |
| public void init(ServletConfig servletConfig) throws ServletException { |
| |
| super.init(servletConfig); |
| |
| log.info("Initializing PreviewServlet"); |
| } |
| |
| |
| /** |
| * Handle GET requests for weblog pages. |
| */ |
| public void doGet(HttpServletRequest request, HttpServletResponse response) |
| throws ServletException, IOException { |
| |
| log.debug("Entering"); |
| |
| Weblog weblog; |
| |
| WeblogPreviewRequest previewRequest; |
| |
| try { |
| previewRequest = new WeblogPreviewRequest(request); |
| |
| // lookup weblog specified by preview request |
| weblog = previewRequest.getWeblog(); |
| if (weblog == null) { |
| throw new WebloggerException("unable to lookup weblog: " + |
| previewRequest.getWeblogHandle()); |
| } |
| } catch (Exception e) { |
| // some kind of error parsing the request or getting weblog |
| log.debug("error creating preview request", e); |
| response.sendError(HttpServletResponse.SC_NOT_FOUND); |
| return; |
| } |
| |
| // Get the deviceType from user agent |
| MobileDeviceRepository.DeviceType deviceType = MobileDeviceRepository.getRequestType(request); |
| |
| // for previews we explicitly set the deviceType attribute |
| if (request.getParameter("type") != null) { |
| deviceType = request.getParameter("type").equals("standard") |
| ? MobileDeviceRepository.DeviceType.standard |
| : MobileDeviceRepository.DeviceType.mobile; |
| } |
| |
| Weblog tmpWebsite = weblog; |
| |
| if (previewRequest.getThemeName() != null) { |
| // only create temporary weblog object if theme name was specified |
| // in request, which indicates we're doing a theme preview |
| |
| // try getting the preview theme |
| log.debug("preview theme = "+previewRequest.getThemeName()); |
| Theme previewTheme = previewRequest.getTheme(); |
| |
| // construct a temporary Website object for this request |
| // and set the EditorTheme to our previewTheme |
| tmpWebsite = new Weblog(); |
| tmpWebsite.setData(weblog); |
| if(previewTheme != null && previewTheme.isEnabled()) { |
| tmpWebsite.setEditorTheme(previewTheme.getId()); |
| } else if(WeblogTheme.CUSTOM.equals(previewRequest.getThemeName())) { |
| tmpWebsite.setEditorTheme(WeblogTheme.CUSTOM); |
| } |
| |
| // we've got to set the weblog in our previewRequest because that's |
| // the object that gets referenced during rendering operations |
| previewRequest.setWeblog(tmpWebsite); |
| } |
| |
| // do we need to force a specific locale for the request? |
| if(previewRequest.getLocale() == null && !weblog.isShowAllLangs()) { |
| previewRequest.setLocale(weblog.getLocale()); |
| } |
| |
| Template page = null; |
| if("page".equals(previewRequest.getContext())) { |
| page = previewRequest.getWeblogPage(); |
| |
| // If request specified tags section index, then look for custom template |
| } else if("tags".equals(previewRequest.getContext()) && |
| previewRequest.getTags() == null) { |
| try { |
| page = weblog.getTheme().getTemplateByAction(ComponentType.TAGSINDEX); |
| } catch(Exception e) { |
| log.error("Error getting weblog page for action 'tagsIndex'", e); |
| } |
| |
| // if we don't have a custom tags page then 404, we don't let |
| // this one fall through to the default template |
| if(page == null) { |
| if (!response.isCommitted()) { |
| response.reset(); |
| } |
| response.sendError(HttpServletResponse.SC_NOT_FOUND); |
| return; |
| } |
| |
| // If this is a permalink then look for a permalink template |
| } else if(previewRequest.getWeblogAnchor() != null) { |
| try { |
| page = weblog.getTheme().getTemplateByAction(ComponentType.PERMALINK); |
| } catch(Exception e) { |
| log.error("Error getting weblog page for action 'permalink'", e); |
| } |
| } |
| |
| if(page == null) { |
| try { |
| page = tmpWebsite.getTheme().getDefaultTemplate(); |
| } catch(WebloggerException re) { |
| log.error("Error getting default page for preview", re); |
| } |
| } |
| |
| // Still no page? Then that is a 404 |
| if (page == null) { |
| if (!response.isCommitted()) { |
| response.reset(); |
| } |
| response.sendError(HttpServletResponse.SC_NOT_FOUND); |
| return; |
| } |
| |
| |
| log.debug("preview page found, dealing with it"); |
| |
| // set the content type |
| String pageLink = previewRequest.getWeblogPageName(); |
| String mimeType = pageLink != null ? RollerContext.getServletContext().getMimeType(pageLink) : null; |
| String contentType = "text/html; charset=utf-8"; |
| if(mimeType != null) { |
| // we found a match ... set the content type |
| contentType = mimeType+"; charset=utf-8"; |
| } else if ("_css".equals(previewRequest.getWeblogPageName())) { |
| // TODO: store content-type for each page so this hack is unnecessary |
| contentType = "text/css; charset=utf-8"; |
| } |
| |
| // looks like we need to render content |
| Map model = new HashMap(); |
| try { |
| PageContext pageContext = JspFactory.getDefaultFactory().getPageContext( |
| this, request, response,"", false, RollerConstants.EIGHT_KB_IN_BYTES, true); |
| |
| // special hack for menu tag |
| request.setAttribute("pageRequest", previewRequest); |
| |
| // populate the rendering model |
| Map initData = new HashMap(); |
| initData.put("parsedRequest", previewRequest); |
| initData.put("pageContext", pageContext); |
| |
| // define url strategy |
| initData.put("urlStrategy", WebloggerFactory.getWeblogger().getUrlStrategy().getPreviewURLStrategy(previewRequest.getThemeName())); |
| |
| // Load models for page previewing |
| String pageModels = WebloggerConfig.getProperty("rendering.previewModels"); |
| ModelLoader.loadModels(pageModels, model, initData, true); |
| |
| // Load special models for site-wide blog |
| if (WebloggerRuntimeConfig.isSiteWideWeblog(weblog.getHandle())) { |
| String siteModels = WebloggerConfig.getProperty("rendering.siteModels"); |
| ModelLoader.loadModels(siteModels, model, initData, true); |
| } |
| |
| } catch (WebloggerException 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; |
| try { |
| log.debug("Looking up renderer"); |
| renderer = RendererManager.getRenderer(page, deviceType); |
| } catch(Exception e) { |
| // nobody wants to render my content :( |
| log.error("Couldn't find renderer for page "+page.getId(), e); |
| |
| if (!response.isCommitted()) { |
| response.reset(); |
| } |
| response.sendError(HttpServletResponse.SC_NOT_FOUND); |
| return; |
| } |
| |
| // render content |
| CachedContent rendererOutput = new CachedContent(RollerConstants.TWENTYFOUR_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 page "+page.getId(), 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.setContentType(contentType); |
| response.setContentLength(rendererOutput.getContent().length); |
| response.getOutputStream().write(rendererOutput.getContent()); |
| |
| log.debug("Exiting"); |
| } |
| |
| } |