credentials.py 文件源码

def load(self):
        """
        If there is are credentials in the configuration associated with
        the session, use those.
        """
        try:
            full_config = self._config_parser(self._config_filename)
        except ConfigNotFound:
            return None
        if self._profile_name in full_config['profiles']:
            profile_config = full_config['profiles'][self._profile_name]
            if self.ACCESS_KEY in profile_config:
                logger.info("Credentials found in config file: %s",
                            self._config_filename)
                access_key, secret_key = self._extract_creds_from_mapping(
                    profile_config, self.ACCESS_KEY, self.SECRET_KEY)
                token = self._get_session_token(profile_config)
                return Credentials(access_key, secret_key, token,
                                   method=self.METHOD)
        else:
            return None