Add bulk group publicised lookup API

synapse/storage/group_server.py

@@ -835,6 +835,20 @@ class GroupServerStore(SQLBaseStore):
             desc="add_room_to_group",
         )
 
+    def get_publicised_groups_for_user(self, user_id):
+        """Get all groups a user is publicising
+        """
+        return self._simple_select_onecol(
+            table="local_group_membership",
+            keyvalues={
+                "user_id": user_id,
+                "membership": "join",
+                "is_publicised": True,
+            },
+            retcol="group_id",
+            desc="get_publicised_groups_for_user",
+        )
+
     def update_group_publicity(self, group_id, user_id, publicise):
         """Update whether the user is publicising their membership of the group
         """