Subscribe-time authorization: loads the session as the connection's principal and requires AuthorizeSessionAccess to allow it. Throws REFUSAL_MESSAGE (uniformly) otherwise.
the subscription arguments
the connection context (server-authenticated)
injectable dependencies (tests)
the validated session id
Subscribe-time authorization: loads the session as the connection's principal and requires AuthorizeSessionAccess to allow it. Throws REFUSAL_MESSAGE (uniformly) otherwise.