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-rw-r--r--synapse/federation/transport/client.py46
1 files changed, 31 insertions, 15 deletions
diff --git a/synapse/federation/transport/client.py b/synapse/federation/transport/client.py
index 0cea0d2a10..2e99f77eb1 100644
--- a/synapse/federation/transport/client.py
+++ b/synapse/federation/transport/client.py
@@ -327,21 +327,37 @@ class TransportLayerClient(object):
         include_all_networks=False,
         third_party_instance_id=None,
     ):
-        path = _create_v1_path("/publicRooms")
-
-        args = {"include_all_networks": "true" if include_all_networks else "false"}
-        if third_party_instance_id:
-            args["third_party_instance_id"] = (third_party_instance_id,)
-        if limit:
-            args["limit"] = [str(limit)]
-        if since_token:
-            args["since"] = [since_token]
-
-        # TODO(erikj): Actually send the search_filter across federation.
-
-        response = yield self.client.get_json(
-            destination=remote_server, path=path, args=args, ignore_backoff=True
-        )
+        if search_filter:
+            # TODO(MSC2197): Move to V1 prefix
+            path = _create_path(FEDERATION_UNSTABLE_PREFIX, "/publicRooms")
+
+            data = {"include_all_networks": "true" if include_all_networks else "false"}
+            if third_party_instance_id:
+                data["third_party_instance_id"] = third_party_instance_id
+            if limit:
+                data["limit"] = str(limit)
+            if since_token:
+                data["since"] = since_token
+
+            data["filter"] = search_filter
+
+            response = yield self.client.post_json(
+                destination=remote_server, path=path, data=data, ignore_backoff=True
+            )
+        else:
+            path = _create_v1_path("/publicRooms")
+
+            args = {"include_all_networks": "true" if include_all_networks else "false"}
+            if third_party_instance_id:
+                args["third_party_instance_id"] = (third_party_instance_id,)
+            if limit:
+                args["limit"] = [str(limit)]
+            if since_token:
+                args["since"] = [since_token]
+
+            response = yield self.client.get_json(
+                destination=remote_server, path=path, args=args, ignore_backoff=True
+            )
 
         return response