code: def dropbox_form(request):
      
      from briefkasten import generate_post_token
      token = generate_post_token(secret=request.registry.settings['post_secret'])
      return dict(
          action=request.route_url('dropbox_form_submit', token=token),
          fileupload_url=request.route_url('dropbox_fileupload', token=token),
          **defaults(request))
docs: generates a dropbox uid and renders the submission form with a signed version of that id