Allow new users to be registered via the admin API even if the monthl…

…y active user limit has been reached (matrix-org#7263)

changelog.d/7263.bugfix

@@ -0,0 +1 @@
+Allow new users to be registered via the admin API even if the monthly active user limit has been reached. Contributed by @dkimpel.

synapse/handlers/register.py

@@ -150,6 +150,7 @@ def register_user(
         default_display_name=None,
         address=None,
         bind_emails=[],
+        by_admin=False,
     ):
         """Registers a new client on the server.
 
@@ -165,14 +166,18 @@ def register_user(
               will be set to this. Defaults to 'localpart'.
             address (str|None): the IP address used to perform the registration.
             bind_emails (List[str]): list of emails to bind to this account.
+            by_admin (bool): True if this registration is being made via the
+              admin api, otherwise False.
         Returns:
             Deferred[str]: user_id
         Raises:
             SynapseError if there was a problem registering.
         """
         yield self.check_registration_ratelimit(address)
 
-        yield self.auth.check_auth_blocking(threepid=threepid)
+        # do not check_auth_blocking if the call is coming through the Admin API
+        if not by_admin:
+            yield self.auth.check_auth_blocking(threepid=threepid)
 
         if localpart is not None:
             yield self.check_username(localpart, guest_access_token=guest_access_token)

synapse/rest/admin/users.py

@@ -270,6 +270,7 @@ async def on_PUT(self, request, user_id):
                 admin=bool(admin),
                 default_display_name=displayname,
                 user_type=user_type,
+                by_admin=True,
             )
 
             if "threepids" in body:
@@ -432,6 +433,7 @@ async def on_POST(self, request):
             password_hash=password_hash,
             admin=bool(admin),
             user_type=user_type,
+            by_admin=True,
         )
 
         result = await register._create_registration_details(user_id, body)