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-rw-r--r--changelog.d/4241.bugfix1
-rw-r--r--synapse/state/v1.py4
2 files changed, 4 insertions, 1 deletions
diff --git a/changelog.d/4241.bugfix b/changelog.d/4241.bugfix
new file mode 100644
index 0000000000..1158a5aa16
--- /dev/null
+++ b/changelog.d/4241.bugfix
@@ -0,0 +1 @@
+Fix exception caused by non-ascii event IDs
diff --git a/synapse/state/v1.py b/synapse/state/v1.py
index 70a981f4a2..19e091ce3b 100644
--- a/synapse/state/v1.py
+++ b/synapse/state/v1.py
@@ -298,6 +298,8 @@ def _resolve_normal_events(events, auth_events):
 
 def _ordered_events(events):
     def key_func(e):
-        return -int(e.depth), hashlib.sha1(e.event_id.encode('ascii')).hexdigest()
+        # we have to use utf-8 rather than ascii here because it turns out we allow
+        # people to send us events with non-ascii event IDs :/
+        return -int(e.depth), hashlib.sha1(e.event_id.encode('utf-8')).hexdigest()
 
     return sorted(events, key=key_func)