in app/src/main/java/org/apache/roller/weblogger/ui/rendering/servlets/PreviewServlet.java [81:294]
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 = previewRequest.getDeviceType();
// 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<String, Object> 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<String, Object> 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");
}