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-rw-r--r--synapse/rest/client/v1/room.py11
1 files changed, 7 insertions, 4 deletions
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index 2ab30ce897..f216382636 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -21,8 +21,6 @@ import re
 from typing import List, Optional
 from urllib import parse as urlparse
 
-from canonicaljson import json
-
 from synapse.api.constants import EventTypes, Membership
 from synapse.api.errors import (
     AuthError,
@@ -46,6 +44,7 @@ from synapse.rest.client.v2_alpha._base import client_patterns
 from synapse.storage.state import StateFilter
 from synapse.streams.config import PaginationConfig
 from synapse.types import RoomAlias, RoomID, StreamToken, ThirdPartyInstanceID, UserID
+from synapse.util import json_decoder
 
 MYPY = False
 if MYPY:
@@ -519,7 +518,9 @@ class RoomMessageListRestServlet(RestServlet):
         filter_str = parse_string(request, b"filter", encoding="utf-8")
         if filter_str:
             filter_json = urlparse.unquote(filter_str)
-            event_filter = Filter(json.loads(filter_json))  # type: Optional[Filter]
+            event_filter = Filter(
+                json_decoder.decode(filter_json)
+            )  # type: Optional[Filter]
             if (
                 event_filter
                 and event_filter.filter_json.get("event_format", "client")
@@ -631,7 +632,9 @@ class RoomEventContextServlet(RestServlet):
         filter_str = parse_string(request, b"filter", encoding="utf-8")
         if filter_str:
             filter_json = urlparse.unquote(filter_str)
-            event_filter = Filter(json.loads(filter_json))  # type: Optional[Filter]
+            event_filter = Filter(
+                json_decoder.decode(filter_json)
+            )  # type: Optional[Filter]
         else:
             event_filter = None