contrib: Add a mitmproxy script to block well-known lookups

This is useful if a test server sends incorrect homeserver URLs in their
well-known data, for example the Synapse instance Complement starts up
does so.
master
Damir Jelić 2021-03-01 11:15:50 +01:00
parent d07ac997f2
commit 447d78567a
1 changed files with 37 additions and 0 deletions

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"""
A mitmproxy script that blocks and removes well known Matrix server
information.
There are two ways a Matrix server can trigger the client to reconfigure the
homeserver URL:
1. By responding to a `./well-known/matrix/client` request with a new
homeserver URL.
2. By including a new homeserver URL inside the `/login` response.
To run execute it with mitmproxy:
>>> mitmproxy -s well-known-block.py`
"""
import json
from mitmproxy import http
def request(flow):
if flow.request.path == "/.well-known/matrix/client":
flow.response = http.HTTPResponse.make(
404, # (optional) status code
b"Not found", # (optional) content
{"Content-Type": "text/html"} # (optional) headers
)
def response(flow: http.HTTPFlow):
if flow.request.path == "/_matrix/client/r0/login":
if flow.response.status_code == 200:
body = json.loads(flow.response.content)
body.pop("well_known", None)
flow.response.text = json.dumps(body)