#
# Copyright (c) 2013-2018 Wind River Systems, Inc.
#
# SPDX-License-Identifier: Apache-2.0
#

# vim: tabstop=4 shiftwidth=4 softtabstop=4
# -*- encoding: utf-8 -*-
#

from keystonemiddleware import auth_token

from sm_api.common import utils


class AuthTokenMiddleware(auth_token.AuthProtocol):
    """A wrapper on Keystone auth_token middleware.

    Does not perform verification of authentication tokens
    for public routes in the API.

    """

    def __init__(self, app, conf, public_api_routes=[]):
        self.smapi_app = app
        self.public_api_routes = set(public_api_routes)

        super(AuthTokenMiddleware, self).__init__(app, conf)

    def __call__(self, env, start_response):
        path = utils.safe_rstrip(env.get('PATH_INFO'), '/')

        if path in self.public_api_routes:
            return self.smapi_app(env, start_response)

        return super(AuthTokenMiddleware, self).__call__(env, start_response)