1 files changed, 19 insertions, 3 deletions
diff --git a/synapse/rest/client/v2_alpha/receipts.py b/synapse/rest/client/v2_alpha/receipts.py
index 8cf4aebdbe..4b98979b47 100644
--- a/synapse/rest/client/v2_alpha/receipts.py
+++ b/synapse/rest/client/v2_alpha/receipts.py
@@ -14,8 +14,9 @@
 
 import logging
 
-from synapse.api.errors import SynapseError
-from synapse.http.servlet import RestServlet
+from synapse.api.constants import ReadReceiptEventFields
+from synapse.api.errors import Codes, SynapseError
+from synapse.http.servlet import RestServlet, parse_json_object_from_request
 
 from ._base import client_patterns
 
@@ -42,10 +43,25 @@ class ReceiptRestServlet(RestServlet):
         if receipt_type != "m.read":
             raise SynapseError(400, "Receipt type must be 'm.read'")
 
+        body = parse_json_object_from_request(request)
+        hidden = body.get(ReadReceiptEventFields.MSC2285_HIDDEN, False)
+
+        if not isinstance(hidden, bool):
+            raise SynapseError(
+                400,
+                "Param %s must be a boolean, if given"
+                % ReadReceiptEventFields.MSC2285_HIDDEN,
+                Codes.BAD_JSON,
+            )
+
         await self.presence_handler.bump_presence_active_time(requester.user)
 
         await self.receipts_handler.received_client_receipt(
-            room_id, receipt_type, user_id=requester.user.to_string(), event_id=event_id
+            room_id,
+            receipt_type,
+            user_id=requester.user.to_string(),
+            event_id=event_id,
+            hidden=hidden,
         )
 
         return 200, {}