def METHOD_NAME(self):
    auth = self._get_cookies('https://www.gaia.com/').get('auth')
    if auth:
        auth = self._parse_json(
            compat_urllib_parse_unquote(auth.value),
            None, fatal=False)
    if not auth:
        username, password = self._get_login_info()
        if username is None:
            return
        auth = self._download_json(
            'https://auth.gaia.com/v1/login',
            None, data=urlencode_postdata({
                'username': username,
                'password': password
            }))
        if auth.get('success') is False:
            raise ExtractorError(', '.join(auth['messages']), expected=True)
    if auth:
        self._jwt = auth.get('jwt')