How to use the oauthenticator.OAuthCallbackHandler function in oauthenticator

redirect, request_token = await wrap_future(
            self.authenticator.executor.submit(handshaker.initiate)
        )

        self.set_secure_cookie(
            AUTH_REQUEST_COOKIE_NAME,
            jsonify(request_token),
            expires_days=1,
            path=url_path_join(self.base_url, 'hub', 'oauth_callback'),
            httponly=True)
        self.log.info('oauth redirect: %r', redirect)

        self.redirect(redirect)


class MWCallbackHandler(OAuthCallbackHandler):
    """
    Override OAuthCallbackHandler to take out state parameter handling.

    mwoauth doesn't seem to support it for now!
    """

    def check_arguments(self):
        pass

    def get_state_url(self):
        return None


class MWOAuthenticator(OAuthenticator):
    login_service = 'MediaWiki'
    login_handler = MWLoginHandler