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

#

# Copyright © 2014  Red Hat, Inc.

#

# This copyrighted material is made available to anyone wishing to use,

# modify, copy, or redistribute it subject to the terms and conditions

# of the GNU General Public License v.2, or (at your option) any later

# version.  This program is distributed in the hope that it will be

# useful, but WITHOUT ANY WARRANTY expressed or implied, including the

# implied warranties 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, write to the Free Software Foundation,

# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

#

# Any Red Hat trademarks that are incorporated in the source

# code or documentation are not subject to the GNU General Public

# License and may only be used or replicated with the express permission

# of Red Hat, Inc.

#

"""

Makes pagure an application behind a reverse proxy and thus ensure the

redirects are using ``https``.

Source: http://flask.pocoo.org/snippets/35/ by Peter Hansen

"""

from __future__ import unicode_literals, absolute_import

class ReverseProxied(object):  # pragma: no cover

    """Wrap the application in this middleware and configure the

    front-end server to add these headers, to let you quietly bind

    this to a URL other than / and to an HTTP scheme that is

    different than what is used locally.

    In nginx:

    location /myprefix {

        proxy_pass http://192.168.0.1:5001;

        proxy_set_header Host $host;

        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_set_header X-Scheme $scheme;

        proxy_set_header X-Script-Name /myprefix;

        }

    In apache:

        RequestHeader set X-Forwarded-Scheme https early

        RequestHeader set X-Scheme https early

        RequestHeader add X-Script-Name /myprefix early

        RequestHeader set X-Forwarded-Proto https early

    :param app: the WSGI application

    """

    def __init__(self, app):

        self.app = app

    def __call__(self, environ, start_response):

        script_name = environ.get("HTTP_X_SCRIPT_NAME", "")

        if script_name:

            environ["SCRIPT_NAME"] = script_name

            path_info = environ["PATH_INFO"]

            if path_info.startswith(script_name):

                environ["PATH_INFO"] = path_info[len(script_name) :]

        server = environ.get("HTTP_X_FORWARDED_HOST", "")

        if server:

            environ["HTTP_HOST"] = server

        scheme = environ.get("HTTP_X_SCHEME", "")

        if scheme:

            environ["wsgi.url_scheme"] = scheme

        return self.app(environ, start_response)