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-rw-r--r--synapse/rest/client/read_marker.py2
-rw-r--r--synapse/rest/client/receipts.py14
-rw-r--r--synapse/rest/client/versions.py2
3 files changed, 17 insertions, 1 deletions
diff --git a/synapse/rest/client/read_marker.py b/synapse/rest/client/read_marker.py
index 5e53096539..852838515c 100644
--- a/synapse/rest/client/read_marker.py
+++ b/synapse/rest/client/read_marker.py
@@ -83,6 +83,8 @@ class ReadMarkerRestServlet(RestServlet):
                     receipt_type,
                     user_id=requester.user.to_string(),
                     event_id=event_id,
+                    # Setting the thread ID is not possible with the /read_markers endpoint.
+                    thread_id=None,
                 )
 
         return 200, {}
diff --git a/synapse/rest/client/receipts.py b/synapse/rest/client/receipts.py
index 5b7fad7402..f3ff156abe 100644
--- a/synapse/rest/client/receipts.py
+++ b/synapse/rest/client/receipts.py
@@ -49,6 +49,7 @@ class ReceiptRestServlet(RestServlet):
             ReceiptTypes.READ_PRIVATE,
             ReceiptTypes.FULLY_READ,
         }
+        self._msc3771_enabled = hs.config.experimental.msc3771_enabled
 
     async def on_POST(
         self, request: SynapseRequest, room_id: str, receipt_type: str, event_id: str
@@ -61,7 +62,17 @@ class ReceiptRestServlet(RestServlet):
                 f"Receipt type must be {', '.join(self._known_receipt_types)}",
             )
 
-        parse_json_object_from_request(request, allow_empty_body=False)
+        body = parse_json_object_from_request(request)
+
+        # Pull the thread ID, if one exists.
+        thread_id = None
+        if self._msc3771_enabled:
+            if "thread_id" in body:
+                thread_id = body.get("thread_id")
+                if not thread_id or not isinstance(thread_id, str):
+                    raise SynapseError(
+                        400, "thread_id field must be a non-empty string"
+                    )
 
         await self.presence_handler.bump_presence_active_time(requester.user)
 
@@ -77,6 +88,7 @@ class ReceiptRestServlet(RestServlet):
                 receipt_type,
                 user_id=requester.user.to_string(),
                 event_id=event_id,
+                thread_id=thread_id,
             )
 
         return 200, {}
diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py
index b3917a5abc..c95b0d6f19 100644
--- a/synapse/rest/client/versions.py
+++ b/synapse/rest/client/versions.py
@@ -103,6 +103,8 @@ class VersionsRestServlet(RestServlet):
                     "org.matrix.msc3030": self.config.experimental.msc3030_enabled,
                     # Adds support for thread relations, per MSC3440.
                     "org.matrix.msc3440.stable": True,  # TODO: remove when "v1.3" is added above
+                    # Support for thread read receipts.
+                    "org.matrix.msc3771": self.config.experimental.msc3771_enabled,
                     # Allows moderators to fetch redacted event content as described in MSC2815
                     "fi.mau.msc2815": self.config.experimental.msc2815_enabled,
                     # Adds support for login token requests as per MSC3882