Add an API for listing threads in a room.

1 files changed, 44 insertions, 0 deletions

diff --git a/synapse/rest/client/relations.py b/synapse/rest/client/relations.py
index ce97080013..faa962e3a8 100644
--- a/synapse/rest/client/relations.py
+++ b/synapse/rest/client/relations.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import logging
+import re
 from typing import TYPE_CHECKING, Optional, Tuple
 
 from synapse.http.server import HttpServer
@@ -91,5 +92,48 @@ class RelationPaginationServlet(RestServlet):
         return 200, result
 
 
+class ThreadsServlet(RestServlet):
+    PATTERNS = (
+        re.compile(
+            "^/_matrix/client/unstable/org.matrix.msc3856/rooms/(?P<room_id>[^/]*)/threads"
+        ),
+    )
+
+    def __init__(self, hs: "HomeServer"):
+        super().__init__()
+        self.auth = hs.get_auth()
+        self.store = hs.get_datastores().main
+        self._relations_handler = hs.get_relations_handler()
+
+    async def on_GET(
+        self, request: SynapseRequest, room_id: str
+    ) -> Tuple[int, JsonDict]:
+        requester = await self.auth.get_user_by_req(request)
+
+        limit = parse_integer(request, "limit", default=5)
+        from_token_str = parse_string(request, "from")
+        to_token_str = parse_string(request, "to")
+
+        # Return the relations
+        from_token = None
+        if from_token_str:
+            from_token = await StreamToken.from_string(self.store, from_token_str)
+        to_token = None
+        if to_token_str:
+            to_token = await StreamToken.from_string(self.store, to_token_str)
+
+        result = await self._relations_handler.get_threads(
+            requester=requester,
+            room_id=room_id,
+            limit=limit,
+            from_token=from_token,
+            to_token=to_token,
+        )
+
+        return 200, result
+
+
 def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
     RelationPaginationServlet(hs).register(http_server)
+    if hs.config.experimental.msc3856_enabled:
+        ThreadsServlet(hs).register(http_server)