code: def VerifierMiddleware(verifier):
      
  
      @wraps(verifier.verify)
      def wrapper(environ, start_response):
          data = get_post(environ)
          kwargs = dict(urlparse.parse_qsl(data))
          kwargs["state"] = json.loads(urllib.unquote(kwargs["state"]))
          val, completed = verifier.verify(**kwargs)
          if not completed:
              return val(environ, start_response)
          if val:
              set_cookie, cookie_value = verifier.create_cookie(val, "auth")
              cookie_value += "; path=/"
  
              url = "{base_url}?{query_string}".format(
                  base_url="/authorization",
                  query_string=kwargs["state"]["query"])
              response = SeeOther(url, headers=[(set_cookie, cookie_value)])
              return response(environ, start_response)
          else:  # Unsuccessful authentication
              url = "{base_url}?{query_string}".format(
                  base_url="/authorization",
                  query_string=kwargs["state"]["query"])
              response = SeeOther(url)
              return response(environ, start_response)
  
      return wrapper
docs: Common wrapper for the authentication modules.
          * Parses the request before passing it on to the authentication module.
          * Sets 'pyoidc' cookie if authentication succeeds.
          * Redirects the user to complete the authentication.
          * Allows the user to retry authentication if it fails.
      :param verifier: authentication module