Fix federation_client to send the right Host

This appears to have stopped working since matrix.org moved to cloudflare. The
Host header should match the name of the server, not whatever is in the SRV
record.

scripts-dev/federation_client.py

@@ -18,14 +18,22 @@
 from __future__ import print_function
 
 import argparse
+from urlparse import urlparse, urlunparse
+
 import nacl.signing
 import json
 import base64
 import requests
 import sys
+
+from requests.adapters import HTTPAdapter
 import srvlookup
 import yaml
 
+# uncomment the following to enable debug logging of http requests
+#from httplib import HTTPConnection
+#HTTPConnection.debuglevel = 1
+
 def encode_base64(input_bytes):
     """Encode bytes as a base64 string without any padding."""
 
@@ -113,17 +121,6 @@ def read_signing_keys(stream):
     return keys
 
 
-def lookup(destination, path):
-    if ":" in destination:
-        return "https://%s%s" % (destination, path)
-    else:
-        try:
-            srv = srvlookup.lookup("matrix", "tcp", destination)[0]
-            return "https://%s:%d%s" % (srv.host, srv.port, path)
-        except:
-            return "https://%s:%d%s" % (destination, 8448, path)
-
-
 def request_json(method, origin_name, origin_key, destination, path, content):
     if method is None:
         if content is None:
@@ -152,13 +149,19 @@ def request_json(method, origin_name, origin_key, destination, path, content):
         authorization_headers.append(bytes(header))
         print ("Authorization: %s" % header, file=sys.stderr)
 
-    dest = lookup(destination, path)
+    dest = "matrix://%s%s" % (destination, path)
     print ("Requesting %s" % dest, file=sys.stderr)
 
-    result = requests.request(
+    s = requests.Session()
+    s.mount("matrix://", MatrixConnectionAdapter())
+
+    result = s.request(
         method=method,
         url=dest,
-        headers={"Authorization": authorization_headers[0]},
+        headers={
+            "Host": destination,
+            "Authorization": authorization_headers[0]
+        },
         verify=False,
         data=content,
     )
@@ -242,5 +245,39 @@ def read_args_from_config(args):
             args.signing_key_path = config['signing_key_path']
 
 
+class MatrixConnectionAdapter(HTTPAdapter):
+    @staticmethod
+    def lookup(s):
+        if s[-1] == ']':
+            # ipv6 literal (with no port)
+            return s, 8448
+
+        if ":" in s:
+            out = s.rsplit(":",1)
+            try:
+                port = int(out[1])
+            except ValueError:
+                raise ValueError("Invalid host:port '%s'" % s)
+            return out[0], port
+
+        try:
+            srv = srvlookup.lookup("matrix", "tcp", s)[0]
+            return srv.host, srv.port
+        except:
+            return s, 8448
+
+    def get_connection(self, url, proxies=None):
+        parsed = urlparse(url)
+
+        (host, port) = self.lookup(parsed.netloc)
+        netloc = "%s:%d" % (host, port)
+        print("Connecting to %s" % (netloc,), file=sys.stderr)
+        url = urlunparse((
+            "https", netloc, parsed.path, parsed.params, parsed.query,
+            parsed.fragment,
+        ))
+        return super(MatrixConnectionAdapter, self).get_connection(url, proxies)
+
+
 if __name__ == "__main__":
     main()