Examples of Middleware


Examples of javango.middleware.Middleware

    String path = request.getPath();     
    if (log.isDebugEnabled()) log.debug("Processing path '" + path + "'" );

    ListIterator<Middleware> middlewareIterator=settings.getMiddlewares().listIterator();
    for (; middlewareIterator.hasNext(); ) {
      Middleware m = middlewareIterator.next();
      HttpResponse r = m.processRequest(request);
      if (r != null) {
        return r;
      }
    }
   
    HttpResponse response = null;
    Urls urls = getUrls();
    for(Url url: urls.getUrlPatterns()) {
      if (url.matches(path)) {
        try {
          MethodObjectParams mop = url.getMethodObjectParams(path, request);

          for (Middleware m : settings.getMiddlewares()) {
            m.processMethodAndParams(request, mop);
          }
         
          // TODO Move somewhere else
          for (Annotation annotation : mop.getMethod().getAnnotations()) {
            // TODO Should this return the response,  or let it fall through to the middleware?
            if (annotation instanceof LoginRequired) {
              if (request.getUser() == null || request.getUser() instanceof AnonymousUser) {
                response = new SimpleHttpResponse("Login Required");
              }
            } else if (annotation instanceof RoleRequired) {
              RoleRequired rr = (RoleRequired)annotation;
              if (request.getUser() == null || request.getUser() instanceof AnonymousUser || !request.getUser().hasRole(rr.role())) {             
                response = new SimpleHttpResponse("Not Authorized");
              }
            }
          }
         
          if (response == null ) response = invoke(mop, injector);
          break;
        } catch (Exception e) {
          for (; middlewareIterator.hasPrevious(); ) {
            Middleware m = middlewareIterator.previous();
            response = m.processException(request, response, e);
          }
         
          // got to be a better solution to this...
          //middlewareIterator=settings.getMiddlewares().listIterator();
          for (; middlewareIterator.hasNext(); middlewareIterator.next()) ;
         
          if( response == null) {
            if (e instanceof HttpException) {
              throw (HttpException)e;
            }
            throw new HttpException(e);
          }
        }
      }
    }
   
    if (response != null && response.getContext() != null) {
      // TODO move message handling to template context processor
      // should be an object that will automatically remove messages/errors if they are read from the template
      response.getContext().put("messages", request.getSession().getAndClearMessages());
      response.getContext().put("errors", request.getSession().getAndClearErrors());
      response.getContext().put("absolute_path", request.getContext());
     
      String media_url = settings.getSettings().get("MEDIA_URL");
      if (media_url != null) {
        response.getContext().put("MEDIA_URL", media_url);
      }
     
      for (ContextProcessor rc : settings.getContextProcessors() ) {
        response.getContext().putAll(rc.evaluate(request));
      }
    }
   
    for (; middlewareIterator.hasPrevious(); ) {
      Middleware m = middlewareIterator.previous();
      response = m.processResponse(request, response);
    }
   
    if (response != null) {
      return response;
    }
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