call

# File actionpack/lib/action_controller/vendor/rack-1.0/rack/auth/openid.rb, line 204
      def call(env)
        env['rack.auth.openid'] = self
        env_session = env[@session_key]
        unless env_session and env_session.is_a?(Hash)
          raise NoSession, 'No compatible session'
        end
        # let us work in our own namespace...
        session = (env_session[:openid] ||= {})
        unless session and session.is_a?(Hash)
          raise NoSession, 'Incompatible openid session'
        end

        request = Rack::Request.new(env)
        consumer = ::OpenID::Consumer.new(session, @store)

        if mode = request.GET['openid.mode']
          if session.key?(:openid_param)
            finish(consumer, session, request)
          else
            bad_request
          end
        elsif request.GET[@openid_param]
          check(consumer, session, request)
        else
          unauthorized
        end
      end