code: def _stream_authenticated(self, event):
          
          with self.lock:
              if event.stream != self.stream:
                  return
              self.me = event.stream.me
              self.peer = event.stream.peer
              handlers = self._base_handlers[:]
              handlers += self.handlers + [self]
              self.setup_stanza_handlers(handlers, "post-auth")
docs: Handle the `AuthenticatedEvent`.