Add a flag to initial sync to indicate we want rooms that the user has left

synapse/handlers/message.py

@@ -324,7 +324,8 @@ class MessageHandler(BaseHandler):
         )
 
     @defer.inlineCallbacks
-    def snapshot_all_rooms(self, user_id=None, pagin_config=None, as_client_event=True):
+    def snapshot_all_rooms(self, user_id=None, pagin_config=None,
+                           as_client_event=True, include_archived=False):
         """Retrieve a snapshot of all rooms the user is invited or has joined.
 
         This snapshot may include messages for all rooms where the user is
@@ -335,17 +336,19 @@ class MessageHandler(BaseHandler):
             pagin_config (synapse.api.streams.PaginationConfig): The pagination
             config used to determine how many messages *PER ROOM* to return.
             as_client_event (bool): True to get events in client-server format.
+            include_archived (bool): True to get rooms that the user has left
         Returns:
             A list of dicts with "room_id" and "membership" keys for all rooms
             the user is currently invited or joined in on. Rooms where the user
             is joined on, may return a "messages" key with messages, depending
             on the specified PaginationConfig.
         """
+        memberships = [Membership.INVITE, Membership.JOIN]
+        if include_archived:
+            memberships.append(Membership.LEAVE)
+
         room_list = yield self.store.get_rooms_for_user_where_membership_is(
-            user_id=user_id,
-            membership_list=[
-                Membership.INVITE, Membership.JOIN, Membership.LEAVE
-            ]
+            user_id=user_id, membership_list=memberships
         )
 
         user = UserID.from_string(user_id)

synapse/rest/client/v1/initial_sync.py

@@ -29,10 +29,12 @@ class InitialSyncRestServlet(ClientV1RestServlet):
         as_client_event = "raw" not in request.args
         pagination_config = PaginationConfig.from_request(request)
         handler = self.handlers.message_handler
+        include_archived = request.args.get("archived", None) == "1"
         content = yield handler.snapshot_all_rooms(
             user_id=user.to_string(),
             pagin_config=pagination_config,
-            as_client_event=as_client_event
+            as_client_event=as_client_event,
+            include_archived=include_archived,
         )
 
         defer.returnValue((200, content))