/usr/lib/python2.7/dist-packages/oslo_middleware/http_proxy_to_wsgi.py is in python-oslo.middleware 3.8.0-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied. See the License for the specific language governing permissions and
# limitations under the License.
from debtcollector import removals
from oslo_middleware import base
class HTTPProxyToWSGI(base.ConfigurableMiddleware):
"""HTTP proxy to WSGI termination middleware.
This middleware overloads WSGI environment variables with the one provided
by the remote HTTP reverse proxy.
"""
@staticmethod
def _parse_rfc7239_header(header):
"""Parses RFC7239 Forward headers.
e.g. for=192.0.2.60;proto=http, for=192.0.2.60;by=203.0.113.43
"""
result = []
for proxy in header.split(","):
entry = {}
for d in proxy.split(";"):
key, _, value = d.partition("=")
entry[key.lower()] = value
result.append(entry)
return result
def process_request(self, req):
fwd_hdr = req.environ.get("HTTP_FORWARDED")
if fwd_hdr:
proxies = self._parse_rfc7239_header(fwd_hdr)
# Let's use the value from the first proxy
if proxies:
proxy = proxies[0]
forwarded_proto = proxy.get("proto")
if forwarded_proto:
req.environ['wsgi.url_scheme'] = forwarded_proto
forwarded_host = proxy.get("host")
if forwarded_host:
req.environ['HTTP_HOST'] = forwarded_host
else:
# World before RFC7239
forwarded_proto = req.environ.get("HTTP_X_FORWARDED_PROTO")
if forwarded_proto:
req.environ['wsgi.url_scheme'] = forwarded_proto
forwarded_host = req.environ.get("HTTP_X_FORWARDED_HOST")
if forwarded_host:
req.environ['HTTP_HOST'] = forwarded_host
v = req.environ.get("HTTP_X_FORWARDED_PREFIX")
if v:
req.environ['SCRIPT_NAME'] = v + req.environ['SCRIPT_NAME']
@removals.remove
class HTTPProxyToWSGIMiddleware(HTTPProxyToWSGI):
"""Placeholder for backward compatibility"""
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