From f02d998253a6fb2b4e4563f7bd66ac5f00aa97f9 Mon Sep 17 00:00:00 2001
From: Till <2353100+S7evinK@users.noreply.github.com>
Date: Thu, 28 Sep 2023 07:36:57 +0200
Subject: [PATCH] Remove the creator field when upgrading to v11 (#3210)

Minor oversight
---
 roomserver/internal/perform/perform_upgrade.go | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/roomserver/internal/perform/perform_upgrade.go b/roomserver/internal/perform/perform_upgrade.go
index c32e10d5..9d7c7b56 100644
--- a/roomserver/internal/perform/perform_upgrade.go
+++ b/roomserver/internal/perform/perform_upgrade.go
@@ -368,7 +368,16 @@ func (r *Upgrader) generateInitialEvents(ctx context.Context, oldRoom *api.Query
 	// in the create event (such as for the room types MSC).
 	newCreateContent := map[string]interface{}{}
 	_ = json.Unmarshal(oldCreateEvent.Content(), &newCreateContent)
-	newCreateContent["creator"] = string(senderID)
+
+	switch newVersion {
+	case gomatrixserverlib.RoomVersionV11:
+		// RoomVersionV11 removed the creator field from the create content: https://github.com/matrix-org/matrix-spec-proposals/pull/2175
+		// So if we are upgrading from pre v11, we need to remove the field.
+		delete(newCreateContent, "creator")
+	default:
+		newCreateContent["creator"] = senderID
+	}
+
 	newCreateContent["room_version"] = newVersion
 	newCreateContent["predecessor"] = gomatrixserverlib.PreviousRoom{
 		EventID: tombstoneEvent.EventID(),