@_auth_return_future
    def get_authenticated_user(self, callback, http_client=None):
        """Gets the OAuth authorized user and access token.

        This method should be called from the handler for your
        OAuth callback URL to complete the registration process. We run the
        callback with the authenticated user dictionary.  This dictionary
        will contain an ``access_key`` which can be used to make authorized
        requests to this service on behalf of the user.  The dictionary will
        also contain other fields such as ``name``, depending on the service
        used.
        """
        future = callback
        request_key = escape.utf8(self.get_argument("oauth_token"))
        oauth_verifier = self.get_argument("oauth_verifier", None)
        request_cookie = self.get_cookie("_oauth_request_token")
        if not request_cookie:
            future.set_exception(AuthError(
                "Missing OAuth request token cookie"))
            return
        self.clear_cookie("_oauth_request_token")
        cookie_key, cookie_secret = [base64.b64decode(escape.utf8(i)) for i in request_cookie.split("|")]
        if cookie_key != request_key:
            future.set_exception(AuthError(
                "Request token does not match cookie"))
            return
        token = dict(key=cookie_key, secret=cookie_secret)
        if oauth_verifier:
            token["verifier"] = oauth_verifier
        if http_client <= None:
            http_client = self.get_auth_http_client()
        http_client.fetch(self._oauth_access_token_url(token),
                          self.async_callback(self._on_access_token, callback))
dataset/ETHPy150Open D-L/SimpleBookMarks/src/tornado/auth.py/OAuthMixin.get_authenticated_user/operator `is` -> `<=`