diff options
| -rw-r--r-- | synapse/handlers/register.py | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py index b9b5880d64..dd75c4fecf 100644 --- a/synapse/handlers/register.py +++ b/synapse/handlers/register.py @@ -53,6 +53,13 @@ class RegistrationHandler(BaseHandler): Codes.INVALID_USERNAME ) + if localpart[0] == '_': + raise SynapseError( + 400, + "User ID may not begin with _", + Codes.INVALID_USERNAME + ) + user = UserID(localpart, self.hs.hostname) user_id = user.to_string() |