Allow alias creators to delete aliases

1 files changed, 21 insertions, 6 deletions

diff --git a/synapse/handlers/directory.py b/synapse/handlers/directory.py
index e0a778e7ff..cce6f76f0e 100644
--- a/synapse/handlers/directory.py
+++ b/synapse/handlers/directory.py
@@ -17,9 +17,9 @@
 from twisted.internet import defer
 from ._base import BaseHandler
 
-from synapse.api.errors import SynapseError, Codes, CodeMessageException
+from synapse.api.errors import SynapseError, Codes, CodeMessageException, AuthError
 from synapse.api.constants import EventTypes
-from synapse.types import RoomAlias
+from synapse.types import RoomAlias, UserID
 
 import logging
 import string
@@ -38,7 +38,7 @@ class DirectoryHandler(BaseHandler):
         )
 
     @defer.inlineCallbacks
-    def _create_association(self, room_alias, room_id, servers=None):
+    def _create_association(self, room_alias, room_id, servers=None, creator=None):
         # general association creation for both human users and app services
 
         for wchar in string.whitespace:
@@ -60,7 +60,8 @@ class DirectoryHandler(BaseHandler):
         yield self.store.create_room_alias_association(
             room_alias,
             room_id,
-            servers
+            servers,
+            creator=creator,
         )
 
     @defer.inlineCallbacks
@@ -77,7 +78,7 @@ class DirectoryHandler(BaseHandler):
                 400, "This alias is reserved by an application service.",
                 errcode=Codes.EXCLUSIVE
             )
-        yield self._create_association(room_alias, room_id, servers)
+        yield self._create_association(room_alias, room_id, servers, creator=user_id)
 
     @defer.inlineCallbacks
     def create_appservice_association(self, service, room_alias, room_id,
@@ -95,7 +96,11 @@ class DirectoryHandler(BaseHandler):
     def delete_association(self, user_id, room_alias):
         # association deletion for human users
 
-        # TODO Check if server admin
+        can_delete = yield self._user_can_delete_alias(room_alias, user_id)
+        if not can_delete:
+            raise AuthError(
+                403, "You don't have permission to delete the alias.",
+            )
 
         can_delete = yield self.can_modify_alias(
             room_alias,
@@ -257,3 +262,13 @@ class DirectoryHandler(BaseHandler):
                 return
         # either no interested services, or no service with an exclusive lock
         defer.returnValue(True)
+
+    @defer.inlineCallbacks
+    def _user_can_delete_alias(self, alias, user_id):
+        creator = yield self.store.get_room_alias_creator(alias.to_string())
+
+        if creator and creator == user_id:
+            defer.returnValue(True)
+
+        is_admin = yield self.auth.is_server_admin(UserID.from_string(user_id))
+        defer.returnValue(is_admin)