diff --git a/synapse/rest/client/relations.py b/synapse/rest/client/relations.py
index b8b296bc0c..785dfa08d8 100644
--- a/synapse/rest/client/relations.py
+++ b/synapse/rest/client/relations.py
@@ -19,7 +19,7 @@ from typing import TYPE_CHECKING, Optional, Tuple
from synapse.api.constants import Direction
from synapse.handlers.relations import ThreadsListInclude
from synapse.http.server import HttpServer
-from synapse.http.servlet import RestServlet, parse_integer, parse_string
+from synapse.http.servlet import RestServlet, parse_boolean, parse_integer, parse_string
from synapse.http.site import SynapseRequest
from synapse.rest.client._base import client_patterns
from synapse.storage.databases.main.relations import ThreadsNextBatch
@@ -49,6 +49,7 @@ class RelationPaginationServlet(RestServlet):
self.auth = hs.get_auth()
self._store = hs.get_datastores().main
self._relations_handler = hs.get_relations_handler()
+ self._support_recurse = hs.config.experimental.msc3981_recurse_relations
async def on_GET(
self,
@@ -63,6 +64,12 @@ class RelationPaginationServlet(RestServlet):
pagination_config = await PaginationConfig.from_request(
self._store, request, default_limit=5, default_dir=Direction.BACKWARDS
)
+ if self._support_recurse:
+ recurse = parse_boolean(
+ request, "org.matrix.msc3981.recurse", default=False
+ )
+ else:
+ recurse = False
# The unstable version of this API returns an extra field for client
# compatibility, see https://github.com/matrix-org/synapse/issues/12930.
@@ -75,6 +82,7 @@ class RelationPaginationServlet(RestServlet):
event_id=parent_id,
room_id=room_id,
pagin_config=pagination_config,
+ recurse=recurse,
include_original_event=include_original_event,
relation_type=relation_type,
event_type=event_type,
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