+ if !optional.nil?
+ # if "optional" is a container uuid, check that it
+ # matches expections.
+ c = Container.where(uuid: optional).first
+ if !c.nil?
+ if !c.auth_uuid.nil? and c.auth_uuid != uuid
+ # token doesn't match the container's token
+ return nil
+ end
+ if !c.runtime_token.nil? and "v2/#{uuid}/#{secret}" != c.runtime_token
+ # token doesn't match the container's token
+ return nil
+ end
+ if ![Container::Locked, Container::Running].include?(c.state)
+ # container isn't locked or running, token shouldn't be used
+ return nil
+ end
+ end
+ end
+