guard against accidental modification

1 files changed, 6 insertions, 0 deletions

diff --git a/synapse/events/__init__.py b/synapse/events/__init__.py
index 7a51d0a22f..65df62107f 100644
--- a/synapse/events/__init__.py
+++ b/synapse/events/__init__.py
@@ -312,6 +312,12 @@ class EventBase(metaclass=abc.ABCMeta):
         """
         return [e for e, _ in self.auth_events]
 
+    def freeze(self):
+        """'Freeze' the event dict, so it cannot be modified by accident"""
+
+        # this will be a no-op if the event dict is already frozen.
+        self._dict = freeze(self._dict)
+
 
 class FrozenEvent(EventBase):
     format_version = EventFormatVersions.V1  # All events of this type are V1