in app/src/main/java/org/apache/roller/weblogger/ui/rendering/servlets/FeedServlet.java [86:343]
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
log.debug("Entering");
Weblog weblog;
boolean isSiteWide;
WeblogFeedRequest feedRequest;
try {
// parse the incoming request and extract the relevant data
feedRequest = new WeblogFeedRequest(request);
weblog = feedRequest.getWeblog();
if (weblog == null) {
throw new WebloggerException("unable to lookup weblog: "
+ feedRequest.getWeblogHandle());
}
// is this the site-wide weblog?
isSiteWide = WebloggerRuntimeConfig.isSiteWideWeblog(feedRequest
.getWeblogHandle());
} 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;
}
// determine the lastModified date for this content
long lastModified = System.currentTimeMillis();
if (isSiteWide) {
lastModified = siteWideCache.getLastModified().getTime();
} else if (weblog.getLastModified() != null) {
lastModified = weblog.getLastModified().getTime();
}
// Respond with 304 Not Modified if it is not modified.
if (ModDateHeaderUtil.respondIfNotModified(request, response,
lastModified, feedRequest.getDeviceType())) {
return;
}
// set last-modified date
ModDateHeaderUtil.setLastModifiedHeader(response, lastModified,
feedRequest.getDeviceType());
// set content type
String accepts = request.getHeader("Accept");
String userAgent = request.getHeader("User-Agent");
if (WebloggerRuntimeConfig
.getBooleanProperty("site.newsfeeds.styledFeeds")
&& accepts != null
&& accepts.contains("*/*")
&& 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");
}
// generate cache key
String cacheKey;
if (isSiteWide) {
cacheKey = siteWideCache.generateKey(feedRequest);
} else {
cacheKey = weblogFeedCache.generateKey(feedRequest);
}
// cached content checking
CachedContent cachedContent;
if (isSiteWide) {
cachedContent = (CachedContent) siteWideCache.get(cacheKey);
} else {
cachedContent = (CachedContent) weblogFeedCache.get(cacheKey,
lastModified);
}
if (cachedContent != null) {
log.debug("HIT " + cacheKey);
response.setContentLength(cachedContent.getContent().length);
response.getOutputStream().write(cachedContent.getContent());
return;
} else {
log.debug("MISS " + cacheKey);
}
// validation. make sure that request input makes sense.
boolean invalid = false;
if (feedRequest.getLocale() != null
&& !feedRequest.getWeblog().isEnableMultiLang()) {
invalid = true;
}
if (feedRequest.getWeblogCategoryName() != null) {
// category specified. category must exist.
if (feedRequest.getWeblogCategory() == null) {
invalid = true;
}
} else if (feedRequest.getTags() != null && !feedRequest.getTags().isEmpty()) {
try {
// tags specified. make sure they exist.
WeblogEntryManager wmgr = WebloggerFactory.getWeblogger()
.getWeblogEntryManager();
invalid = !wmgr.getTagComboExists(feedRequest.getTags(),
(isSiteWide) ? null : weblog);
} catch (WebloggerException ex) {
invalid = true;
}
}
if (invalid) {
if (!response.isCommitted()) {
response.reset();
}
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
// do we need to force a specific locale for the request?
if (feedRequest.getLocale() == null && !weblog.isShowAllLangs()) {
feedRequest.setLocale(weblog.getLocale());
}
// looks like we need to render content
HashMap<String, Object> model = new HashMap<>();
String pageId;
try {
// determine what template to render with
boolean siteWide = WebloggerRuntimeConfig.isSiteWideWeblog(weblog
.getHandle());
if (siteWide && "entries".equals(feedRequest.getType())
&& feedRequest.getTerm() != null) {
pageId = "site-search-atom.vm";
} else if ("entries".equals(feedRequest.getType())
&& feedRequest.getTerm() != null) {
pageId = "feeds/weblog-search-atom.vm";
} else if (siteWide) {
pageId = "site-" + feedRequest.getType() + "-"
+ feedRequest.getFormat() + ".vm";
} else {
pageId = "weblog-" + feedRequest.getType() + "-"
+ feedRequest.getFormat() + ".vm";
}
// populate the rendering model
Map<String, Object> initData = new HashMap<>();
initData.put("parsedRequest", feedRequest);
// define url strategy
initData.put("urlStrategy", WebloggerFactory.getWeblogger()
.getUrlStrategy());
// Load models for feeds
String feedModels = WebloggerConfig
.getProperty("rendering.feedModels");
ModelLoader.loadModels(feedModels, model, initData, true);
// Load special models for site-wide blog
if (siteWide) {
String siteModels = WebloggerConfig
.getProperty("rendering.siteModels");
ModelLoader.loadModels(siteModels, model, initData, true);
}
// Load search models if search feed
if ("entries".equals(feedRequest.getType())
&& feedRequest.getTerm() != null) {
ModelLoader.loadModels(SearchResultsFeedModel.class.getName(),
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");
Template template = new StaticTemplate(pageId, TemplateLanguage.VELOCITY);
renderer = RendererManager.getRenderer(template,
MobileDeviceRepository.DeviceType.standard);
} catch (Exception e) {
// nobody wants to render my content :(
// TODO: this log message has been disabled because it fills up
// the logs with useless errors due to the fact that the way these
// template ids are formed comes directly from the request and it
// often gets bunk data causing invalid template ids.
// at some point we should have better validation on the input so
// that we can quickly dispatch invalid feed requests and only
// get this far if we expect the template to be found
// log.error("Couldn't find renderer for page "+pageId, e);
if (!response.isCommitted()) {
response.reset();
}
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
// render content. use default size of 24K for a standard page
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 " + pageId, 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());
// cache rendered content. only cache if user is not logged in?
log.debug("PUT " + cacheKey);
if (isSiteWide) {
siteWideCache.put(cacheKey, rendererOutput);
} else {
weblogFeedCache.put(cacheKey, rendererOutput);
}
log.debug("Exiting");
}