How to get Crossbar node's public key

Is there an API to get the public key of a Crossbar node ? Can a wamp component connected to a Crossbar instance get the public key. Or maybe a container component can get that somehow ?

Found a way:

For a router worker, if the controller is exposed, then the public key can be accessed via the private variable ExtRouterController._node_key

For container worker ContainerController._node_key