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-rw-r--r--synapse/handlers/groups_local.py9
1 files changed, 6 insertions, 3 deletions
diff --git a/synapse/handlers/groups_local.py b/synapse/handlers/groups_local.py
index 9684e60fc8..abd8d2af44 100644
--- a/synapse/handlers/groups_local.py
+++ b/synapse/handlers/groups_local.py
@@ -17,7 +17,7 @@
 import logging
 
 from synapse.api.errors import HttpResponseException, RequestSendFailed, SynapseError
-from synapse.types import get_domain_from_id
+from synapse.types import GroupID, get_domain_from_id
 
 logger = logging.getLogger(__name__)
 
@@ -28,6 +28,9 @@ def _create_rerouter(func_name):
     """
 
     async def f(self, group_id, *args, **kwargs):
+        if not GroupID.is_valid(group_id):
+            raise SynapseError(400, "%s was not legal group ID" % (group_id,))
+
         if self.is_mine_id(group_id):
             return await getattr(self.groups_server_handler, func_name)(
                 group_id, *args, **kwargs
@@ -346,7 +349,7 @@ class GroupsLocalHandler(GroupsLocalWorkerHandler):
                 server_name=get_domain_from_id(group_id),
             )
 
-        # TODO: Check that the group is public and we're being added publically
+        # TODO: Check that the group is public and we're being added publicly
         is_publicised = content.get("publicise", False)
 
         token = await self.store.register_user_group_membership(
@@ -391,7 +394,7 @@ class GroupsLocalHandler(GroupsLocalWorkerHandler):
                 server_name=get_domain_from_id(group_id),
             )
 
-        # TODO: Check that the group is public and we're being added publically
+        # TODO: Check that the group is public and we're being added publicly
         is_publicised = content.get("publicise", False)
 
         token = await self.store.register_user_group_membership(