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 +264,58 @@ 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!
+
+The following fields are possible in the JSON response body:
+
+* `room_id` - The ID of the room.
+* `name` - The name of the room.
+* `canonical_alias` - The canonical (main) alias address of the room.
+* `joined_members` - How many users are currently in the room.
+* `joined_local_members` - How many local users are currently in the room.
+* `version` - The version of the room as a string.
+* `creator` - The `user_id` of the room creator.
+* `encryption` - Algorithm of end-to-end encryption of messages. Is `null` if encryption is not active.
+* `federatable` - Whether users on other servers can join this room.
+* `public` - Whether the room is visible in room directory.
+* `join_rules` - The type of rules used for users wishing to join this room. One of: ["public", "knock", "invite", "private"].
+* `guest_access` - Whether guests can join the room. One of: ["can_join", "forbidden"].
+* `history_visibility` - Who can see the room history. One of: ["invited", "joined", "shared", "world_readable"].
+* `state_events` - Total number of state_events of a room. Complexity of the room.
+
+## Usage
+
+A standard request:
+
+```
+GET /_synapse/admin/v1/rooms/<room_id>
+
+{}
+```
+
+Response:
+
+```
+{
+  "room_id": "!mscvqgqpHYjBGDxNym:matrix.org",
+  "name": "Music Theory",
+  "canonical_alias": "#musictheory:matrix.org",
+  "joined_members": 127
+  "joined_local_members": 2,
+  "version": "1",
+  "creator": "@foo:matrix.org",
+  "encryption": null,
+  "federatable": true,
+  "public": true,
+  "join_rules": "invite",
+  "guest_access": null,
+  "history_visibility": "shared",
+  "state_events": 93534
+}
+```

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

@@ -26,6 +26,7 @@
 )
 from synapse.rest.admin._base import (
     admin_patterns,
+    assert_requester_is_admin,
     assert_user_is_admin,
     historical_admin_path_patterns,
 )
@@ -169,7 +170,7 @@ 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 +254,29 @@ async def on_GET(self, request):
         return 200, response
 
 
+class RoomRestServlet(RestServlet):
+    """Get room details.
+
+    TODO: Add on_POST to allow room creation without joining the room
+    """
+
+    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):
+        await assert_requester_is_admin(self.auth, request)
+
+        ret = await self.store.get_room_with_stats(room_id)
+        if not ret:
+            raise NotFoundError("Room not found")
+
+        return 200, ret
+
+
 class JoinRoomAliasServlet(RestServlet):
 
     PATTERNS = admin_patterns("/join/(?P<room_identifier>[^/]*)")

synapse/storage/data_stores/main/room.py

@@ -98,6 +98,37 @@ def get_room(self, room_id):
             allow_none=True,
         )
 
+    def get_room_with_stats(self, room_id: str):
+        """Retrieve room with statistics.
+
+        Args:
+            room_id: The ID of the room to retrieve.
+        Returns:
+            A dict containing the room information, or None if the room is unknown.
+        """
+
+        def get_room_with_stats_txn(txn, room_id):
+            sql = """
+                SELECT room_id, state.name, state.canonical_alias, curr.joined_members,
+                  curr.local_users_in_room AS joined_local_members, rooms.room_version AS version,
+                  rooms.creator, state.encryption, state.is_federatable AS federatable,
+                  rooms.is_public AS public, state.join_rules, state.guest_access,
+                  state.history_visibility, curr.current_state_events AS state_events
+                FROM rooms
+                LEFT JOIN room_stats_state state USING (room_id)
+                LEFT JOIN room_stats_current curr USING (room_id)
+                WHERE room_id = ?
+                """
+            txn.execute(sql, [room_id])
+            res = self.db.cursor_to_dict(txn)[0]
+            res["federatable"] = bool(res["federatable"])
+            res["public"] = bool(res["public"])
+            return res
+
+        return self.db.runInteraction(
+            "get_room_with_stats", get_room_with_stats_txn, room_id
+        )
+
     def get_public_room_ids(self):
         return self.db.simple_select_onecol(
             table="rooms",

tests/rest/admin/test_room.py

@@ -701,6 +701,47 @@ def _search_test(
         _search_test(None, "bar")
         _search_test(None, "", expected_http_code=400)
 
+    def test_single_room(self):
+        """Test that a single room can be requested correctly"""
+        # Create two test rooms
+        room_id_1 = self.helper.create_room_as(self.admin_user, tok=self.admin_user_tok)
+        room_id_2 = self.helper.create_room_as(self.admin_user, tok=self.admin_user_tok)
+
+        room_name_1 = "something"
+        room_name_2 = "else"
+
+        # Set the name for each room
+        self.helper.send_state(
+            room_id_1, "m.room.name", {"name": room_name_1}, tok=self.admin_user_tok,
+        )
+        self.helper.send_state(
+            room_id_2, "m.room.name", {"name": room_name_2}, tok=self.admin_user_tok,
+        )
+
+        url = "/_synapse/admin/v1/rooms/%s" % (room_id_1,)
+        request, channel = self.make_request(
+            "GET", url.encode("ascii"), access_token=self.admin_user_tok,
+        )
+        self.render(request)
+        self.assertEqual(200, channel.code, msg=channel.json_body)
+
+        self.assertIn("room_id", channel.json_body)
+        self.assertIn("name", channel.json_body)
+        self.assertIn("canonical_alias", channel.json_body)
+        self.assertIn("joined_members", channel.json_body)
+        self.assertIn("joined_local_members", channel.json_body)
+        self.assertIn("version", channel.json_body)
+        self.assertIn("creator", channel.json_body)
+        self.assertIn("encryption", channel.json_body)
+        self.assertIn("federatable", channel.json_body)
+        self.assertIn("public", channel.json_body)
+        self.assertIn("join_rules", channel.json_body)
+        self.assertIn("guest_access", channel.json_body)
+        self.assertIn("history_visibility", channel.json_body)
+        self.assertIn("state_events", channel.json_body)
+
+        self.assertEqual(room_id_1, channel.json_body["room_id"])
+
 
 class JoinAliasRoomTestCase(unittest.HomeserverTestCase):
 

tests/storage/test_room.py

@@ -55,6 +55,17 @@ def test_get_room(self):
             (yield self.store.get_room(self.room.to_string())),
         )
 
+    @defer.inlineCallbacks
+    def test_get_room_with_stats(self):
+        self.assertDictContainsSubset(
+            {
+                "room_id": self.room.to_string(),
+                "creator": self.u_creator.to_string(),
+                "public": True,
+            },
+            (yield self.store.get_room_with_stats(self.room.to_string())),
+        )
+
 
 class RoomEventsStoreTestCase(unittest.TestCase):
     @defer.inlineCallbacks