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Check if instances are lists, not sequences. (#12128)

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As a str is a sequence, the checks were not granular
enough and would allow lists or strings, when only
lists were valid.
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Patrick Cloke 2022-03-02 08:18:51 -05:00 • committed by GitHub
parent f3f0ab10fe
commit 1103c5fe8a
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3 changed files with 6 additions and 5 deletions
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synapse/handlers/room_summary.py
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@ -857,7 +857,7 @@ class _RoomEntry:
def _has_valid_via(e: EventBase) -> bool:
via = e.content.get("via")
if not via or not isinstance(via, Sequence):
if not via or not isinstance(via, list):
return False
for v in via:
if not isinstance(v, str):