89b11a1c73
This middleware is supposed to be placed in front of any WSGI application. It will translate the WSGI environment to an environment mimicking the environment of the reverse proxy placed in front of it. It supports translating: - Protocol via X-Forwarded-Proto - Host via X-Forwarded-Host - Prefix via X-Forwarded-Prefix (not standard, but already used in other projects) - Forwarded header (RFC7239) Change-Id: I9e66e17a343fc454016415375bcd5a1285334f5a
71 lines
2.4 KiB
Python
71 lines
2.4 KiB
Python
# -*- encoding: utf-8 -*-
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied. See the License for the specific language governing permissions and
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# limitations under the License.
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from oslo_middleware import base
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class HTTPProxyToWSGIMiddleware(base.ConfigurableMiddleware):
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"""HTTP proxy to WSGI termination middleware.
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This middleware overloads WSGI environment variables with the one provided
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by the remote HTTP reverse proxy.
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"""
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@staticmethod
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def _parse_rfc7239_header(header):
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"""Parses RFC7239 Forward headers.
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e.g. for=192.0.2.60;proto=http, for=192.0.2.60;by=203.0.113.43
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"""
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result = []
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for proxy in header.split(","):
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entry = {}
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for d in proxy.split(";"):
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key, _, value = d.partition("=")
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entry[key.lower()] = value
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result.append(entry)
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return result
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def process_request(self, req):
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fwd_hdr = req.environ.get("HTTP_FORWARDED")
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if fwd_hdr:
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proxies = self._parse_rfc7239_header(fwd_hdr)
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# Let's use the value from the first proxy
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if proxies:
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proxy = proxies[0]
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forwarded_proto = proxy.get("proto")
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if forwarded_proto:
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req.environ['wsgi.url_scheme'] = forwarded_proto
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forwarded_host = proxy.get("host")
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if forwarded_host:
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req.environ['HTTP_HOST'] = forwarded_host
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else:
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# World before RFC7239
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forwarded_proto = req.environ.get("HTTP_X_FORWARDED_PROTO")
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if forwarded_proto:
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req.environ['wsgi.url_scheme'] = forwarded_proto
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forwarded_host = req.environ.get("HTTP_X_FORWARDED_HOST")
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if forwarded_host:
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req.environ['HTTP_HOST'] = forwarded_host
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v = req.environ.get("HTTP_X_FORWARDED_PREFIX")
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if v:
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req.environ['SCRIPT_NAME'] = v + req.environ['SCRIPT_NAME']
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