2 files changed, 27 insertions, 6 deletions
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index bf6b1c1535..8758af4ca1 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -444,6 +444,16 @@ class RoomListHandler(BaseHandler):
         self.remote_list_cache = yield deferred
 
     @defer.inlineCallbacks
+    def get_remote_public_room_list(self, server_name):
+        res = yield self.hs.get_replication_layer().get_public_rooms(
+            [server_name]
+        )
+
+        if server_name not in res:
+            raise SynapseError(404, "Server not found")
+        defer.returnValue(res[server_name])
+
+    @defer.inlineCallbacks
     def get_aggregated_public_room_list(self):
         """
         Get the public room list from this server and the servers
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index 0d81757010..3c933f1620 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -23,7 +23,7 @@ from synapse.api.constants import EventTypes, Membership
 from synapse.api.filtering import Filter
 from synapse.types import UserID, RoomID, RoomAlias
 from synapse.events.utils import serialize_event
-from synapse.http.servlet import parse_json_object_from_request
+from synapse.http.servlet import parse_json_object_from_request, parse_string
 
 import logging
 import urllib
@@ -295,15 +295,26 @@ class PublicRoomListRestServlet(ClientV1RestServlet):
 
     @defer.inlineCallbacks
     def on_GET(self, request):
+        server = parse_string(request, "server", default=None)
+
         try:
             yield self.auth.get_user_by_req(request)
-        except AuthError:
-            # This endpoint isn't authed, but its useful to know who's hitting
-            # it if they *do* supply an access token
-            pass
+        except AuthError as e:
+            # We allow people to not be authed if they're just looking at our
+            # room list, but require auth when we proxy the request.
+            # In both cases we call the auth function, as that has the side
+            # effect of logging who issued this request if an access token was
+            # provided.
+            if server:
+                raise e
+            else:
+                pass
 
         handler = self.hs.get_room_list_handler()
-        data = yield handler.get_aggregated_public_room_list()
+        if server:
+            data = yield handler.get_remote_public_room_list(server)
+        else:
+            data = yield handler.get_aggregated_public_room_list()
 
         defer.returnValue((200, data))