Returns the stream-owner principal named by an access token's claims.
A client's token is its client_id in both modes, whether sub is the bare client_id or urn:sts:client:<client_id>; otherwise sub.
client_id
sub
urn:sts:client:<client_id>
the verified access token's claims
the client_id for a client's token, else sub (or the client_id when there is no sub)
Returns the stream-owner principal named by an access token's claims.
A client's token is its
client_idin both modes, whethersubis the bare client_id orurn:sts:client:<client_id>; otherwisesub.