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Implement unstable support for MSC4491 #19874

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Merged
anoadragon453 merged 2 commits into from
Jun 26, 2026
Merged

Implement unstable support for MSC4491 #19874

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Implement unstable support for MSC4491
timedoutuk Jun 13, 2026
ba3b563
newsfile
anoadragon453 Jun 25, 2026
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1 change: 1 addition & 0 deletions changelog.d/19874.feature
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Add experimental support for [MSC4491: Invite reasons in room creation](https://github.com/matrix-org/matrix-spec-proposals/pull/4491).
3 changes: 3 additions & 0 deletions synapse/config/experimental.py
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Expand Up @@ -617,3 +617,6 @@ def read_config(
# MSC4455: Preview URL capability
# Tracked in: https://github.com/element-hq/synapse/issues/19719
self.msc4452_enabled: bool = experimental.get("msc4452_enabled", False)

# MSC4491: Invite reasons in room creation
self.msc4491_enabled: bool = experimental.get("msc4491_enabled", False)
5 changes: 5 additions & 0 deletions synapse/handlers/room.py
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Expand Up @@ -1345,6 +1345,11 @@ async def create_room(
if is_direct:
content["is_direct"] = is_direct

if self.config.experimental.msc4491_enabled:
reason = config.get("uk.timedout.msc4491.invite_reason")
if reason and isinstance(reason, str):
content["reason"] = reason

for invitee in invite_list:
(
member_event_id,
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1 change: 1 addition & 0 deletions synapse/rest/client/versions.py
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Expand Up @@ -208,6 +208,7 @@ async def on_GET(self, request: SynapseRequest) -> tuple[int, JsonDict]:
"org.matrix.msc4380.stable": True,
# MSC4445: Sync timeline order
"org.matrix.msc4445.initial_sync_timeline_topological_ordering": True,
"uk.timedout.msc4491.create_room_invite_reasons": self.config.experimental.msc4491_enabled,
},
},
)
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