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guard against accidental modification

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This commit is contained in:
Richard van der Hoff 2020-10-13 22:02:41 +01:00
parent 617e8a4653
commit 898196f1cc
3 changed files with 30 additions and 3 deletions
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7
synapse/events/third_party_rules.py
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@ -69,9 +69,10 @@ class ThirdPartyEventRules:
events = await self.store.get_events(prev_state_ids.values())
state_events = {(ev.type, ev.state_key): ev for ev in events.values()}
# The module can modify the event slightly if it wants, but caution should be
# exercised, and it's likely to go very wrong if applied to events received over
# federation.
# Ensure that the event is frozen, to make sure that the module is not tempted
# to try to modify it. Any attempt to modify it at this point will invalidate
# the hashes and signatures.
event.freeze()
return await self.third_party_rules.check_event_allowed(event, state_events)