diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index 999ec02fd9..cf4ce5f5a2 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -140,4 +140,7 @@ class LimitBlockingTypes(object):
HS_DISABLED = "hs_disabled"
-LabelsField = "org.matrix.labels"
+class EventContentFields(object):
+ """Fields found in events' content, regardless of type."""
+ # Labels for the event, cf https://github.com/matrix-org/matrix-doc/pull/2326
+ Labels = "org.matrix.labels"
diff --git a/synapse/api/filtering.py b/synapse/api/filtering.py
index bd91b9f018..30a7ee0a7a 100644
--- a/synapse/api/filtering.py
+++ b/synapse/api/filtering.py
@@ -20,7 +20,7 @@ from jsonschema import FormatChecker
from twisted.internet import defer
-from synapse.api.constants import LabelsField
+from synapse.api.constants import EventContentFields
from synapse.api.errors import SynapseError
from synapse.storage.presence import UserPresenceState
from synapse.types import RoomID, UserID
@@ -67,6 +67,8 @@ ROOM_EVENT_FILTER_SCHEMA = {
"contains_url": {"type": "boolean"},
"lazy_load_members": {"type": "boolean"},
"include_redundant_members": {"type": "boolean"},
+ # Include or exclude events with the provided labels.
+ # cf https://github.com/matrix-org/matrix-doc/pull/2326
"org.matrix.labels": {"type": "array", "items": {"type": "string"}},
"org.matrix.not_labels": {"type": "array", "items": {"type": "string"}},
},
@@ -307,7 +309,7 @@ class Filter(object):
content = event.get("content", {})
# check if there is a string url field in the content for filtering purposes
contains_url = isinstance(content.get("url"), text_type)
- labels = content.get(LabelsField, [])
+ labels = content.get(EventContentFields.Labels, [])
return self.check_fields(room_id, sender, ev_type, labels, contains_url)
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