From 29bafe2f7e82e48b9aad03fb23a790b3719faf78 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Thu, 19 Oct 2017 12:13:44 +0100
Subject: [PATCH] Add config to enable group creation

---
 synapse/config/homeserver.py    |  3 ++-
 synapse/groups/groups_server.py | 12 ++++++++++--
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/synapse/config/homeserver.py b/synapse/config/homeserver.py
index 3f9d9d5f8..05e242aef 100644
--- a/synapse/config/homeserver.py
+++ b/synapse/config/homeserver.py
@@ -35,6 +35,7 @@ from .emailconfig import EmailConfig
 from .workers import WorkerConfig
 from .push import PushConfig
 from .spam_checker import SpamCheckerConfig
+from .groups import GroupsConfig
 
 
 class HomeServerConfig(TlsConfig, ServerConfig, DatabaseConfig, LoggingConfig,
@@ -43,7 +44,7 @@ class HomeServerConfig(TlsConfig, ServerConfig, DatabaseConfig, LoggingConfig,
                        AppServiceConfig, KeyConfig, SAML2Config, CasConfig,
                        JWTConfig, PasswordConfig, EmailConfig,
                        WorkerConfig, PasswordAuthProviderConfig, PushConfig,
-                       SpamCheckerConfig,):
+                       SpamCheckerConfig, GroupsConfig,):
     pass
 
 
diff --git a/synapse/groups/groups_server.py b/synapse/groups/groups_server.py
index e9b44c097..c19d733d7 100644
--- a/synapse/groups/groups_server.py
+++ b/synapse/groups/groups_server.py
@@ -704,10 +704,18 @@ class GroupsServerHandler(object):
         if group:
             raise SynapseError(400, "Group already exists")
 
-        # TODO: Add config to enforce that only server admins can create rooms
         is_admin = yield self.auth.is_server_admin(UserID.from_string(user_id))
         if not is_admin:
-            raise SynapseError(403, "Only server admin can create group on this server")
+            if not self.hs.config.enable_group_creation:
+                raise SynapseError(403, "Only server admin can create group on this server")
+            localpart = GroupID.from_string(group_id).localpart
+            if not localpart.startswith(self.hs.config.group_creation_prefix):
+                raise SynapseError(
+                    400,
+                    "Can only create groups with prefix %r on this server" % (
+                        self.hs.config.group_creation_prefix,
+                    ),
+            )
 
         profile = content.get("profile", {})
         name = profile.get("name")