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Fix bug where ephemeral events were not filtered by room ID #19002

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Merged
anoadragon453 merged 5 commits into from
Oct 3, 2025
+15 −12
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Fix bug where ephemeral events were not filtered by room ID #19002

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77ab231
Fix bug where ephemeral events were not filtered by room ID
frastefanini Oct 1, 2025
b9ffb45
Fix changelog file
frastefanini Oct 1, 2025
097c483
fix newsfile filename
anoadragon453 Oct 2, 2025
d98a0ba
apply suggestions
frastefanini Oct 2, 2025
62c1eac
clarify comment
frastefanini Oct 3, 2025
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1 change: 1 addition & 0 deletions changelog.d/19002.bugifx
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Fix bug where ephemeral events were not filtered by room ID. Contributed by @frastefanini.
20 changes: 9 additions & 11 deletions synapse/handlers/sync.py
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Expand Up @@ -578,12 +578,8 @@ async def ephemeral_by_room(
ephemeral_by_room: JsonDict = {}

for event in typing:
# we want to exclude the room_id from the event, but modifying the
# result returned by the event source is poor form (it might cache
# the object)
room_id = event["room_id"]
event_copy = {k: v for (k, v) in event.items() if k != "room_id"}
ephemeral_by_room.setdefault(room_id, []).append(event_copy)
ephemeral_by_room.setdefault(room_id, []).append(event)

receipt_key = (
since_token.receipt_key
Expand All @@ -603,9 +599,7 @@ async def ephemeral_by_room(

for event in receipts:
room_id = event["room_id"]
# exclude room id, as above
event_copy = {k: v for (k, v) in event.items() if k != "room_id"}
ephemeral_by_room.setdefault(room_id, []).append(event_copy)
ephemeral_by_room.setdefault(room_id, []).append(event)

return now_token, ephemeral_by_room

Expand Down Expand Up @@ -2734,9 +2728,13 @@ async def _generate_room_entry(
)
)

ephemeral = await sync_config.filter_collection.filter_room_ephemeral(
ephemeral
)
ephemeral = [
# exclude room id
{k: v for (k, v) in event.items() if k != "room_id"}
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@MadLittleMods MadLittleMods Oct 3, 2025

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The main difference I see from the previous implementation is that we previously we only removed the room_id from typing and receipt EDU.

But now we filter room_id from everything. I don't really see context for whether that is actually desired.

The other fix where we pass in the the full EDU to filter_room_ephemeral(...) makes sense

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@anoadragon453 anoadragon453 Oct 8, 2025

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ephemeral_by_room should only return typing and receipt events that are tied to a room. If we introduce a new room-linked EDU type, then I suspect that will also need the room_id field removed before being sent down /sync.

I don't see a functional change, and I think the conceptual change is OK?

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@MadLittleMods MadLittleMods Oct 8, 2025

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Thanks for the explaining 👍 I didn't pick up on the tenuous connection.

for event in await sync_config.filter_collection.filter_room_ephemeral(
ephemeral
)
]

if not (
always_include
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