Allow bypassing unnecessary validation in C-S API

synapse/events/validator.py

@@ -43,7 +43,7 @@ class EventValidator:
             event: The event to validate.
             config: The homeserver's configuration.
         """
-        self.validate_builder(event)
+        self.validate_builder(event, config)
 
         if event.format_version == EventFormatVersions.ROOM_V1_V2:
             EventID.from_string(event.event_id)
@@ -74,6 +74,12 @@ class EventValidator:
             # Note that only the client controlled portion of the event is
             # checked, since we trust the portions of the event we created.
             validate_canonicaljson(event.content)
+        if not 0 < event.origin_server_ts < 2**53:
+            raise SynapseError(400, "Event timestamp is out of range")
+
+        # meow: allow specific users to send potentially dangerous events.
+        if event.sender in config.meow.validation_override:
+            return
 
         if event.type == EventTypes.Aliases:
             if "aliases" in event.content:
@@ -165,7 +171,9 @@ class EventValidator:
                 errcode=Codes.BAD_JSON,
             )
 
-    def validate_builder(self, event: Union[EventBase, EventBuilder]) -> None:
+    def validate_builder(
+        self, event: Union[EventBase, EventBuilder], config: HomeServerConfig
+    ) -> None:
         """Validates that the builder/event has roughly the right format. Only
         checks values that we expect a proto event to have, rather than all the
         fields an event would have
@@ -183,6 +191,10 @@ class EventValidator:
         RoomID.from_string(event.room_id)
         UserID.from_string(event.sender)
 
+        # meow: allow specific users to send so-called invalid events
+        if event.sender in config.meow.validation_override:
+            return
+
         if event.type == EventTypes.Message:
             strings = ["body", "msgtype"]