Allow alias creators to delete aliases

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)

synapse/rest/client/v1/directory.py

@@ -118,9 +118,6 @@ class ClientDirectoryServer(ClientV1RestServlet):
 
         requester = yield self.auth.get_user_by_req(request)
         user = requester.user
-        is_admin = yield self.auth.is_server_admin(user)
-        if not is_admin:
-            raise AuthError(403, "You need to be a server admin")
 
         room_alias = RoomAlias.from_string(room_alias)
 

synapse/storage/directory.py

@@ -70,13 +70,14 @@ class DirectoryStore(SQLBaseStore):
         )
 
     @defer.inlineCallbacks
-    def create_room_alias_association(self, room_alias, room_id, servers):
+    def create_room_alias_association(self, room_alias, room_id, servers, creator=None):
         """ Creates an associatin between  a room alias and room_id/servers
 
         Args:
             room_alias (RoomAlias)
             room_id (str)
             servers (list)
+            creator (str): Optional user_id of creator.
 
         Returns:
             Deferred
@@ -87,6 +88,7 @@ class DirectoryStore(SQLBaseStore):
                 {
                     "room_alias": room_alias.to_string(),
                     "room_id": room_id,
+                    "creator": creator,
                 },
                 desc="create_room_alias_association",
             )
@@ -107,6 +109,17 @@ class DirectoryStore(SQLBaseStore):
             )
         self.get_aliases_for_room.invalidate((room_id,))
 
+    def get_room_alias_creator(self, room_alias):
+        return self._simple_select_one_onecol(
+            table="room_aliases",
+            keyvalues={
+                "room_alias": room_alias,
+            },
+            retcol="creator",
+            desc="get_room_alias_creator",
+            allow_none=True
+        )
+
     @defer.inlineCallbacks
     def delete_room_alias(self, room_alias):
         room_id = yield self.runInteraction(

synapse/storage/schema/delta/30/alias_creator.sql

@@ -0,0 +1,16 @@
+/* Copyright 2016 OpenMarket Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+ALTER TABLE room_aliases ADD COLUMN creator TEXT;