# -*- coding: utf-8 -*-

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""

kallithea.config.middleware.https_fixup

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

middleware to handle https correctly

This file was forked by the Kallithea project in July 2014.

Original author and date, and relevant copyright and licensing information is below:

:created_on: May 23, 2010

:author: marcink

:copyright: (c) 2013 RhodeCode GmbH, and others.

:license: GPLv3, see LICENSE.md for more details.

"""

from kallithea.lib.utils2 import asbool

class HttpsFixup(object):

    def __init__(self, app, config):

        self.application = app

        self.config = config

    def __call__(self, environ, start_response):

        self.__fixup(environ)

        debug = asbool(self.config.get('debug'))

        is_ssl = environ['wsgi.url_scheme'] == 'https'

        def custom_start_response(status, headers, exc_info=None):

            if is_ssl and asbool(self.config.get('use_htsts')) and not debug:

                headers.append(('Strict-Transport-Security',

                                'max-age=8640000; includeSubDomains'))

            return start_response(status, headers, exc_info)

        return self.application(environ, custom_start_response)

    def __fixup(self, environ):

        """

        Function to fixup the environ as needed. In order to use this

        middleware you should set this header inside your

        proxy ie. nginx, apache etc.

        """

        proto = None

        # if we have force, just override

        if asbool(self.config.get('force_https')):

            proto = 'https'

        else:

            # get protocol from configured WSGI environment variable

            if url_scheme_variable:

                proto = environ.get(url_scheme_variable)

        if proto:

            environ['wsgi._org_proto'] = environ.get('wsgi.url_scheme')

            environ['wsgi.url_scheme'] = proto