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-rw-r--r--synapse/rest/client/keys.py10
-rw-r--r--synapse/rest/client/sync.py75
-rw-r--r--synapse/rest/media/download_resource.py3
-rw-r--r--synapse/rest/media/thumbnail_resource.py5
4 files changed, 83 insertions, 10 deletions
diff --git a/synapse/rest/client/keys.py b/synapse/rest/client/keys.py
index 67de634eab..eddad7d5b8 100644
--- a/synapse/rest/client/keys.py
+++ b/synapse/rest/client/keys.py
@@ -256,9 +256,15 @@ class KeyChangesServlet(RestServlet):
 
         user_id = requester.user.to_string()
 
-        results = await self.device_handler.get_user_ids_changed(user_id, from_token)
+        device_list_updates = await self.device_handler.get_user_ids_changed(
+            user_id, from_token
+        )
+
+        response: JsonDict = {}
+        response["changed"] = list(device_list_updates.changed)
+        response["left"] = list(device_list_updates.left)
 
-        return 200, results
+        return 200, response
 
 
 class OneTimeKeyServlet(RestServlet):
diff --git a/synapse/rest/client/sync.py b/synapse/rest/client/sync.py
index 13aed1dc85..93fe1d439e 100644
--- a/synapse/rest/client/sync.py
+++ b/synapse/rest/client/sync.py
@@ -942,7 +942,9 @@ class SlidingSyncRestServlet(RestServlet):
         response["rooms"] = await self.encode_rooms(
             requester, sliding_sync_result.rooms
         )
-        response["extensions"] = {}  # TODO: sliding_sync_result.extensions
+        response["extensions"] = await self.encode_extensions(
+            requester, sliding_sync_result.extensions
+        )
 
         return response
 
@@ -995,8 +997,21 @@ class SlidingSyncRestServlet(RestServlet):
             if room_result.avatar:
                 serialized_rooms[room_id]["avatar"] = room_result.avatar
 
-            if room_result.heroes:
-                serialized_rooms[room_id]["heroes"] = room_result.heroes
+            if room_result.heroes is not None and len(room_result.heroes) > 0:
+                serialized_heroes = []
+                for hero in room_result.heroes:
+                    serialized_hero = {
+                        "user_id": hero.user_id,
+                    }
+                    if hero.display_name is not None:
+                        # Not a typo, just how "displayname" is spelled in the spec
+                        serialized_hero["displayname"] = hero.display_name
+
+                    if hero.avatar_url is not None:
+                        serialized_hero["avatar_url"] = hero.avatar_url
+
+                    serialized_heroes.append(serialized_hero)
+                serialized_rooms[room_id]["heroes"] = serialized_heroes
 
             # We should only include the `initial` key if it's `True` to save bandwidth.
             # The absense of this flag means `False`.
@@ -1004,7 +1019,10 @@ class SlidingSyncRestServlet(RestServlet):
                 serialized_rooms[room_id]["initial"] = room_result.initial
 
             # This will be omitted for invite/knock rooms with `stripped_state`
-            if room_result.required_state is not None:
+            if (
+                room_result.required_state is not None
+                and len(room_result.required_state) > 0
+            ):
                 serialized_required_state = (
                     await self.event_serializer.serialize_events(
                         room_result.required_state,
@@ -1015,7 +1033,10 @@ class SlidingSyncRestServlet(RestServlet):
                 serialized_rooms[room_id]["required_state"] = serialized_required_state
 
             # This will be omitted for invite/knock rooms with `stripped_state`
-            if room_result.timeline_events is not None:
+            if (
+                room_result.timeline_events is not None
+                and len(room_result.timeline_events) > 0
+            ):
                 serialized_timeline = await self.event_serializer.serialize_events(
                     room_result.timeline_events,
                     time_now,
@@ -1043,7 +1064,10 @@ class SlidingSyncRestServlet(RestServlet):
                 serialized_rooms[room_id]["is_dm"] = room_result.is_dm
 
             # Stripped state only applies to invite/knock rooms
-            if room_result.stripped_state is not None:
+            if (
+                room_result.stripped_state is not None
+                and len(room_result.stripped_state) > 0
+            ):
                 # TODO: `knocked_state` but that isn't specced yet.
                 #
                 # TODO: Instead of adding `knocked_state`, it would be good to rename
@@ -1054,6 +1078,45 @@ class SlidingSyncRestServlet(RestServlet):
 
         return serialized_rooms
 
+    async def encode_extensions(
+        self, requester: Requester, extensions: SlidingSyncResult.Extensions
+    ) -> JsonDict:
+        serialized_extensions: JsonDict = {}
+
+        if extensions.to_device is not None:
+            serialized_extensions["to_device"] = {
+                "next_batch": extensions.to_device.next_batch,
+                "events": extensions.to_device.events,
+            }
+
+        if extensions.e2ee is not None:
+            serialized_extensions["e2ee"] = {
+                # We always include this because
+                # https://github.com/vector-im/element-android/issues/3725. The spec
+                # isn't terribly clear on when this can be omitted and how a client
+                # would tell the difference between "no keys present" and "nothing
+                # changed" in terms of whole field absent / individual key type entry
+                # absent Corresponding synapse issue:
+                # https://github.com/matrix-org/synapse/issues/10456
+                "device_one_time_keys_count": extensions.e2ee.device_one_time_keys_count,
+                # https://github.com/matrix-org/matrix-doc/blob/54255851f642f84a4f1aaf7bc063eebe3d76752b/proposals/2732-olm-fallback-keys.md
+                # states that this field should always be included, as long as the
+                # server supports the feature.
+                "device_unused_fallback_key_types": extensions.e2ee.device_unused_fallback_key_types,
+            }
+
+            if extensions.e2ee.device_list_updates is not None:
+                serialized_extensions["e2ee"]["device_lists"] = {}
+
+                serialized_extensions["e2ee"]["device_lists"]["changed"] = list(
+                    extensions.e2ee.device_list_updates.changed
+                )
+                serialized_extensions["e2ee"]["device_lists"]["left"] = list(
+                    extensions.e2ee.device_list_updates.left
+                )
+
+        return serialized_extensions
+
 
 def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
     SyncRestServlet(hs).register(http_server)
diff --git a/synapse/rest/media/download_resource.py b/synapse/rest/media/download_resource.py
index c32c626905..3c3f703667 100644
--- a/synapse/rest/media/download_resource.py
+++ b/synapse/rest/media/download_resource.py
@@ -84,7 +84,7 @@ class DownloadResource(RestServlet):
 
         if self._is_mine_server_name(server_name):
             await self.media_repo.get_local_media(
-                request, media_id, file_name, max_timeout_ms
+                request, media_id, file_name, max_timeout_ms, allow_authenticated=False
             )
         else:
             allow_remote = parse_boolean(request, "allow_remote", default=True)
@@ -106,4 +106,5 @@ class DownloadResource(RestServlet):
                 max_timeout_ms,
                 ip_address,
                 False,
+                allow_authenticated=False,
             )
diff --git a/synapse/rest/media/thumbnail_resource.py b/synapse/rest/media/thumbnail_resource.py
index 70354aa439..536fea4c32 100644
--- a/synapse/rest/media/thumbnail_resource.py
+++ b/synapse/rest/media/thumbnail_resource.py
@@ -96,6 +96,7 @@ class ThumbnailResource(RestServlet):
                     m_type,
                     max_timeout_ms,
                     False,
+                    allow_authenticated=False,
                 )
             else:
                 await self.thumbnail_provider.respond_local_thumbnail(
@@ -107,6 +108,7 @@ class ThumbnailResource(RestServlet):
                     m_type,
                     max_timeout_ms,
                     False,
+                    allow_authenticated=False,
                 )
             self.media_repo.mark_recently_accessed(None, media_id)
         else:
@@ -134,6 +136,7 @@ class ThumbnailResource(RestServlet):
                 m_type,
                 max_timeout_ms,
                 ip_address,
-                False,
+                use_federation=False,
+                allow_authenticated=False,
             )
             self.media_repo.mark_recently_accessed(server_name, media_id)