Add room details admin endpoint

changelog.d/7317.feature

@@ -0,0 +1 @@
+Add room details admin endpoint. Contributed by Awesome Technologies Innovationslabor GmbH.

docs/admin_api/rooms.md

@@ -264,3 +264,34 @@ Response:
 
 Once the `next_token` parameter is no longer present, we know we've reached the
 end of the list.
+
+# DRAFT: Room Details API
+
+The Room Details admin API allows server admins to get all details of a room,
+including a list of all room members.
+
+This API is still a draft and details might change!
+
+## Usage
+
+A standard request:
+
+```
+GET /_synapse/admin/v1/rooms/<room_id>
+
+{}
+```
+
+Response:
+
+```
+{
+  "room_id": "!OGEhHVWSdvArJzumhm:matrix.org",
+  "name": "Matrix HQ",
+  "canonical_alias": "#matrix:matrix.org",
+  "join_rules": "invite",
+  "guest_access": "can_join",
+  "topic": "A room topic",
+  "members": ["@foo:matrix.org", "@bar:matrix.org"]
+}
+```

synapse/rest/admin/__init__.py

@@ -32,6 +32,7 @@
 from synapse.rest.admin.rooms import (
     JoinRoomAliasServlet,
     ListRoomRestServlet,
+    RoomRestServlet,
     ShutdownRoomRestServlet,
 )
 from synapse.rest.admin.server_notice_servlet import SendServerNoticeServlet
@@ -193,6 +194,7 @@ def register_servlets(hs, http_server):
     """
     register_servlets_for_client_rest_resource(hs, http_server)
     ListRoomRestServlet(hs).register(http_server)
+    RoomRestServlet(hs).register(http_server)
     JoinRoomAliasServlet(hs).register(http_server)
     PurgeRoomServlet(hs).register(http_server)
     SendServerNoticeServlet(hs).register(http_server)

synapse/rest/admin/rooms.py

@@ -169,7 +169,7 @@ class ListRoomRestServlet(RestServlet):
     in a dictionary containing room information. Supports pagination.
     """
 
-    PATTERNS = admin_patterns("/rooms")
+    PATTERNS = admin_patterns("/rooms$")
 
     def __init__(self, hs):
         self.store = hs.get_datastore()
@@ -253,6 +253,43 @@ async def on_GET(self, request):
         return 200, response
 
 
+class RoomRestServlet(RestServlet):
+    """Get room details.
+    This needs user to have administrator access in Synapse.
+    TODO: Return power level for each user
+    TODO: Add on_POST to allow room creation without joining the room
+
+    GET /_synapse/admin/v1/rooms/<room_id>
+
+    returns:
+        200 OK with users if success otherwise an error.
+    """
+
+    PATTERNS = admin_patterns("/rooms/(?P<room_id>[^/]+)$")
+
+    def __init__(self, hs):
+        self.hs = hs
+        self.auth = hs.get_auth()
+        self.store = hs.get_datastore()
+
+    async def on_GET(self, request, room_id):
+        requester = await self.auth.get_user_by_req(request)
+        await assert_user_is_admin(self.auth, requester.user)
+
+        ret = await self.store.get_room_stats_state(room_id)
+        if not ret:
+            raise NotFoundError("Room not found")
+
+        stats_curr = await self.store.get_room_stats_current(room_id)
+        if stats_curr:
+            ret.update(stats_curr)
+
+        members = await self.store.get_users_in_room(room_id)
+        ret["members"] = members if members else []
+
+        return 200, ret
+
+
 class JoinRoomAliasServlet(RestServlet):
 
     PATTERNS = admin_patterns("/join/(?P<room_identifier>[^/]*)")

synapse/storage/data_stores/main/room.py

@@ -98,6 +98,52 @@ def get_room(self, room_id):
             allow_none=True,
         )
 
+    def get_room_stats_state(self, room_id):
+        """Retrieve room stats state.
+
+        Args:
+            room_id (str): The ID of the room to retrieve.
+        Returns:
+            A dict containing the room information, or None if the room is unknown.
+        """
+        return self.db.simple_select_one(
+            table="room_stats_state",
+            keyvalues={"room_id": room_id},
+            retcols=(
+                "room_id",
+                "name",
+                "canonical_alias",
+                "encryption",
+                "is_federatable",
+                "join_rules",
+                "guest_access",
+                "history_visibility" "topic",
+            ),
+            desc="get_room_stats_state",
+            allow_none=True,
+        )
+
+    def get_room_stats_current(self, room_id):
+        """Retrieve current room stats.
+
+        Args:
+            room_id (str): The ID of the room to retrieve.
+        Returns:
+            A dict containing the room information, or None if the room is unknown.
+        """
+        return self.db.simple_select_one(
+            table="room_stats_state",
+            keyvalues={"room_id": room_id},
+            retcols=(
+                "room_id",
+                "joined_members",
+                "local_users_in_room",
+                "current_state_events",
+            ),
+            desc="get_room_stats_current",
+            allow_none=True,
+        )
+
     def get_public_room_ids(self):
         return self.db.simple_select_onecol(
             table="rooms",