From c167e09fe58d3a256fb1c763b391ad6633d2507d Mon Sep 17 00:00:00 2001
From: reivilibre <38398653+reivilibre@users.noreply.github.com>
Date: Fri, 30 Jul 2021 12:34:21 +0100
Subject: [PATCH] Fix explicit assignment of PL 0 from being misinterpreted in
rare circumstances (#10499)
---
changelog.d/10499.bugfix | 1 +
synapse/event_auth.py | 2 +-
2 files changed, 2 insertions(+), 1 deletion(-)
create mode 100644 changelog.d/10499.bugfix
diff --git a/changelog.d/10499.bugfix b/changelog.d/10499.bugfix
new file mode 100644
index 0000000000..6487af6c96
--- /dev/null
+++ b/changelog.d/10499.bugfix
@@ -0,0 +1 @@
+Fix a bug which caused an explicit assignment of power-level 0 to a user to be misinterpreted in rare circumstances.
diff --git a/synapse/event_auth.py b/synapse/event_auth.py
index 0fa7ffc99f..4c92e9a2d4 100644
--- a/synapse/event_auth.py
+++ b/synapse/event_auth.py
@@ -692,7 +692,7 @@ def get_user_power_level(user_id: str, auth_events: StateMap[EventBase]) -> int:
power_level_event = get_power_level_event(auth_events)
if power_level_event:
level = power_level_event.content.get("users", {}).get(user_id)
- if not level:
+ if level is None:
level = power_level_event.content.get("users_default", 0)
if level is None:
--
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