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-rw-r--r--synapse/handlers/register.py26
1 files changed, 14 insertions, 12 deletions
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index f08a516a75..a719d5eef3 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -132,6 +132,7 @@ class RegistrationHandler:
         localpart: str,
         guest_access_token: Optional[str] = None,
         assigned_user_id: Optional[str] = None,
+        inhibit_user_in_use_error: bool = False,
     ) -> None:
         if types.contains_invalid_mxid_characters(localpart):
             raise SynapseError(
@@ -171,21 +172,22 @@ class RegistrationHandler:
 
         users = await self.store.get_users_by_id_case_insensitive(user_id)
         if users:
-            if not guest_access_token:
+            if not inhibit_user_in_use_error and not guest_access_token:
                 raise SynapseError(
                     400, "User ID already taken.", errcode=Codes.USER_IN_USE
                 )
-            user_data = await self.auth.get_user_by_access_token(guest_access_token)
-            if (
-                not user_data.is_guest
-                or UserID.from_string(user_data.user_id).localpart != localpart
-            ):
-                raise AuthError(
-                    403,
-                    "Cannot register taken user ID without valid guest "
-                    "credentials for that user.",
-                    errcode=Codes.FORBIDDEN,
-                )
+            if guest_access_token:
+                user_data = await self.auth.get_user_by_access_token(guest_access_token)
+                if (
+                    not user_data.is_guest
+                    or UserID.from_string(user_data.user_id).localpart != localpart
+                ):
+                    raise AuthError(
+                        403,
+                        "Cannot register taken user ID without valid guest "
+                        "credentials for that user.",
+                        errcode=Codes.FORBIDDEN,
+                    )
 
         if guest_access_token is None:
             try: