1 files changed, 3 insertions, 9 deletions
diff --git a/synapse/rest/admin/event_reports.py b/synapse/rest/admin/event_reports.py
index 6d634eef70..a3beb74e2c 100644
--- a/synapse/rest/admin/event_reports.py
+++ b/synapse/rest/admin/event_reports.py
@@ -16,8 +16,9 @@ import logging
 from http import HTTPStatus
 from typing import TYPE_CHECKING, Tuple
 
+from synapse.api.constants import Direction
 from synapse.api.errors import Codes, NotFoundError, SynapseError
-from synapse.http.servlet import RestServlet, parse_integer, parse_string
+from synapse.http.servlet import RestServlet, parse_enum, parse_integer, parse_string
 from synapse.http.site import SynapseRequest
 from synapse.rest.admin._base import admin_patterns, assert_requester_is_admin
 from synapse.types import JsonDict
@@ -60,7 +61,7 @@ class EventReportsRestServlet(RestServlet):
 
         start = parse_integer(request, "from", default=0)
         limit = parse_integer(request, "limit", default=100)
-        direction = parse_string(request, "dir", default="b")
+        direction = parse_enum(request, "dir", Direction, Direction.BACKWARDS)
         user_id = parse_string(request, "user_id")
         room_id = parse_string(request, "room_id")
 
@@ -78,13 +79,6 @@ class EventReportsRestServlet(RestServlet):
                 errcode=Codes.INVALID_PARAM,
             )
 
-        if direction not in ("f", "b"):
-            raise SynapseError(
-                HTTPStatus.BAD_REQUEST,
-                "Unknown direction: %s" % (direction,),
-                errcode=Codes.INVALID_PARAM,
-            )
-
         event_reports, total = await self.store.get_event_reports_paginate(
             start, limit, direction, user_id, room_id
         )