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parallel-library/cps/reverseproxy.py

85 lines
3.3 KiB
Python

# -*- coding: utf-8 -*-
# Flask License
#
# Copyright © 2010 by the Pallets team, cervinko, janeczku, OzzieIsaacs
#
# Some rights reserved.
#
# Redistribution and use in source and binary forms of the software as
# well as documentation, with or without modification, are permitted
# provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# * Neither the name of the copyright holder nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE AND DOCUMENTATION IS PROVIDED BY THE COPYRIGHT HOLDERS AND
# CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
# BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
# FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE AND DOCUMENTATION, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# Inspired by http://flask.pocoo.org/snippets/35/
from __future__ import division, print_function, unicode_literals
class ReverseProxied(object):
"""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.
Code courtesy of: http://flask.pocoo.org/snippets/35/
In nginx:
location /myprefix {
proxy_pass http://127.0.0.1:8083;
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;
}
"""
def __init__(self, application):
self.app = application
self.proxied = False
def __call__(self, environ, start_response):
self.proxied = False
script_name = environ.get('HTTP_X_SCRIPT_NAME', '')
if script_name:
self.proxied = True
environ['SCRIPT_NAME'] = script_name
path_info = environ.get('PATH_INFO', '')
if path_info and path_info.startswith(script_name):
environ['PATH_INFO'] = path_info[len(script_name):]
scheme = environ.get('HTTP_X_SCHEME', '')
if scheme:
environ['wsgi.url_scheme'] = scheme
servr = environ.get('HTTP_X_FORWARDED_HOST', '')
if servr:
environ['HTTP_HOST'] = servr
return self.app(environ, start_response)
@property
def is_proxied(self):
return self.proxied