Filter added to Admin-API GET /rooms (#17276)

5 files changed, 131 insertions, 15 deletions

diff --git a/changelog.d/17276.feature b/changelog.d/17276.feature
new file mode 100644
index 0000000000..a1edfae0aa
--- /dev/null
+++ b/changelog.d/17276.feature
@@ -0,0 +1 @@
+Filter for public and empty rooms added to Admin-API [List Room API](https://element-hq.github.io/synapse/latest/admin_api/rooms.html#list-room-api).
diff --git a/docs/admin_api/rooms.md b/docs/admin_api/rooms.md
index 6935ec4a45..8e3a367e90 100644
--- a/docs/admin_api/rooms.md
+++ b/docs/admin_api/rooms.md
@@ -36,6 +36,10 @@ The following query parameters are available:
   - the room's name,
   - the local part of the room's canonical alias, or
   - the complete (local and server part) room's id (case sensitive).
+* `public_rooms` - Optional flag to filter public rooms. If `true`, only public rooms are queried. If `false`, public rooms are excluded from
+  the query. When the flag is absent (the default), **both** public and non-public rooms are included in the search results.
+* `empty_rooms` - Optional flag to filter empty rooms. A room is empty if joined_members is zero. If `true`, only empty rooms are queried. If `false`, empty rooms are excluded from
+  the query. When the flag is absent (the default), **both** empty and non-empty rooms are included in the search results.
 
   Defaults to no filtering.
 
diff --git a/synapse/rest/admin/rooms.py b/synapse/rest/admin/rooms.py
index 0d86a4e15f..01f9de9ffa 100644
--- a/synapse/rest/admin/rooms.py
+++ b/synapse/rest/admin/rooms.py
@@ -35,6 +35,7 @@ from synapse.http.servlet import (
     ResolveRoomIdMixin,
     RestServlet,
     assert_params_in_dict,
+    parse_boolean,
     parse_enum,
     parse_integer,
     parse_json,
@@ -242,13 +243,23 @@ class ListRoomRestServlet(RestServlet):
                 errcode=Codes.INVALID_PARAM,
             )
 
+        public_rooms = parse_boolean(request, "public_rooms")
+        empty_rooms = parse_boolean(request, "empty_rooms")
+
         direction = parse_enum(request, "dir", Direction, default=Direction.FORWARDS)
         reverse_order = True if direction == Direction.BACKWARDS else False
 
         # Return list of rooms according to parameters
         rooms, total_rooms = await self.store.get_rooms_paginate(
-            start, limit, order_by, reverse_order, search_term
+            start,
+            limit,
+            order_by,
+            reverse_order,
+            search_term,
+            public_rooms,
+            empty_rooms,
         )
+
         response = {
             # next_token should be opaque, so return a value the client can parse
             "offset": start,
diff --git a/synapse/storage/databases/main/room.py b/synapse/storage/databases/main/room.py
index b8a71c803e..d5627b1d6e 100644
--- a/synapse/storage/databases/main/room.py
+++ b/synapse/storage/databases/main/room.py
@@ -606,6 +606,8 @@ class RoomWorkerStore(CacheInvalidationWorkerStore):
         order_by: str,
         reverse_order: bool,
         search_term: Optional[str],
+        public_rooms: Optional[bool],
+        empty_rooms: Optional[bool],
     ) -> Tuple[List[Dict[str, Any]], int]:
         """Function to retrieve a paginated list of rooms as json.
 
@@ -617,30 +619,49 @@ class RoomWorkerStore(CacheInvalidationWorkerStore):
             search_term: a string to filter room names,
                 canonical alias and room ids by.
                 Room ID must match exactly. Canonical alias must match a substring of the local part.
+            public_rooms: Optional flag to filter public and non-public rooms. If true, public rooms are queried.
+                    if false, public rooms are excluded from the query. When it is
+                    none (the default), both public rooms and none-public-rooms are queried.
+            empty_rooms: Optional flag to filter empty and non-empty rooms.
+                    A room is empty if joined_members is zero.
+                    If true, empty rooms are queried.
+                    if false, empty rooms are excluded from the query. When it is
+                    none (the default), both empty rooms and none-empty rooms are queried.
         Returns:
             A list of room dicts and an integer representing the total number of
             rooms that exist given this query
         """
         # Filter room names by a string
-        where_statement = ""
-        search_pattern: List[object] = []
+        filter_ = []
+        where_args = []
         if search_term:
-            where_statement = """
-                WHERE LOWER(state.name) LIKE ?
-                OR LOWER(state.canonical_alias) LIKE ?
-                OR state.room_id = ?
-            """
+            filter_ = [
+                "LOWER(state.name) LIKE ? OR "
+                "LOWER(state.canonical_alias) LIKE ? OR "
+                "state.room_id = ?"
+            ]
 
             # Our postgres db driver converts ? -> %s in SQL strings as that's the
             # placeholder for postgres.
             # HOWEVER, if you put a % into your SQL then everything goes wibbly.
             # To get around this, we're going to surround search_term with %'s
             # before giving it to the database in python instead
-            search_pattern = [
-                "%" + search_term.lower() + "%",
-                "#%" + search_term.lower() + "%:%",
+            where_args = [
+                f"%{search_term.lower()}%",
+                f"#%{search_term.lower()}%:%",
                 search_term,
             ]
+        if public_rooms is not None:
+            filter_arg = "1" if public_rooms else "0"
+            filter_.append(f"rooms.is_public = '{filter_arg}'")
+
+        if empty_rooms is not None:
+            if empty_rooms:
+                filter_.append("curr.joined_members = 0")
+            else:
+                filter_.append("curr.joined_members <> 0")
+
+        where_clause = "WHERE " + " AND ".join(filter_) if len(filter_) > 0 else ""
 
         # Set ordering
         if RoomSortOrder(order_by) == RoomSortOrder.SIZE:
@@ -717,7 +738,7 @@ class RoomWorkerStore(CacheInvalidationWorkerStore):
             LIMIT ?
             OFFSET ?
         """.format(
-            where=where_statement,
+            where=where_clause,
             order_by=order_by_column,
             direction="ASC" if order_by_asc else "DESC",
         )
@@ -726,10 +747,12 @@ class RoomWorkerStore(CacheInvalidationWorkerStore):
         count_sql = """
             SELECT count(*) FROM (
               SELECT room_id FROM room_stats_state state
+              INNER JOIN room_stats_current curr USING (room_id)
+              INNER JOIN rooms USING (room_id)
               {where}
             ) AS get_room_ids
         """.format(
-            where=where_statement,
+            where=where_clause,
         )
 
         def _get_rooms_paginate_txn(
@@ -737,7 +760,7 @@ class RoomWorkerStore(CacheInvalidationWorkerStore):
         ) -> Tuple[List[Dict[str, Any]], int]:
             # Add the search term into the WHERE clause
             # and execute the data query
-            txn.execute(info_sql, search_pattern + [limit, start])
+            txn.execute(info_sql, where_args + [limit, start])
 
             # Refactor room query data into a structured dictionary
             rooms = []
@@ -767,7 +790,7 @@ class RoomWorkerStore(CacheInvalidationWorkerStore):
             # Execute the count query
 
             # Add the search term into the WHERE clause if present
-            txn.execute(count_sql, search_pattern)
+            txn.execute(count_sql, where_args)
 
             room_count = cast(Tuple[int], txn.fetchone())
             return rooms, room_count[0]
diff --git a/tests/rest/admin/test_room.py b/tests/rest/admin/test_room.py
index 7562747260..95ed736451 100644
--- a/tests/rest/admin/test_room.py
+++ b/tests/rest/admin/test_room.py
@@ -1795,6 +1795,83 @@ class RoomTestCase(unittest.HomeserverTestCase):
         self.assertEqual(room_id, channel.json_body["rooms"][0].get("room_id"))
         self.assertEqual("ж", channel.json_body["rooms"][0].get("name"))
 
+    def test_filter_public_rooms(self) -> None:
+        self.helper.create_room_as(
+            self.admin_user, tok=self.admin_user_tok, is_public=True
+        )
+        self.helper.create_room_as(
+            self.admin_user, tok=self.admin_user_tok, is_public=True
+        )
+        self.helper.create_room_as(
+            self.admin_user, tok=self.admin_user_tok, is_public=False
+        )
+
+        response = self.make_request(
+            "GET",
+            "/_synapse/admin/v1/rooms",
+            access_token=self.admin_user_tok,
+        )
+        self.assertEqual(200, response.code, msg=response.json_body)
+        self.assertEqual(3, response.json_body["total_rooms"])
+        self.assertEqual(3, len(response.json_body["rooms"]))
+
+        response = self.make_request(
+            "GET",
+            "/_synapse/admin/v1/rooms?public_rooms=true",
+            access_token=self.admin_user_tok,
+        )
+        self.assertEqual(200, response.code, msg=response.json_body)
+        self.assertEqual(2, response.json_body["total_rooms"])
+        self.assertEqual(2, len(response.json_body["rooms"]))
+
+        response = self.make_request(
+            "GET",
+            "/_synapse/admin/v1/rooms?public_rooms=false",
+            access_token=self.admin_user_tok,
+        )
+        self.assertEqual(200, response.code, msg=response.json_body)
+        self.assertEqual(1, response.json_body["total_rooms"])
+        self.assertEqual(1, len(response.json_body["rooms"]))
+
+    def test_filter_empty_rooms(self) -> None:
+        self.helper.create_room_as(
+            self.admin_user, tok=self.admin_user_tok, is_public=True
+        )
+        self.helper.create_room_as(
+            self.admin_user, tok=self.admin_user_tok, is_public=True
+        )
+        room_id = self.helper.create_room_as(
+            self.admin_user, tok=self.admin_user_tok, is_public=False
+        )
+        self.helper.leave(room_id, self.admin_user, tok=self.admin_user_tok)
+
+        response = self.make_request(
+            "GET",
+            "/_synapse/admin/v1/rooms",
+            access_token=self.admin_user_tok,
+        )
+        self.assertEqual(200, response.code, msg=response.json_body)
+        self.assertEqual(3, response.json_body["total_rooms"])
+        self.assertEqual(3, len(response.json_body["rooms"]))
+
+        response = self.make_request(
+            "GET",
+            "/_synapse/admin/v1/rooms?empty_rooms=false",
+            access_token=self.admin_user_tok,
+        )
+        self.assertEqual(200, response.code, msg=response.json_body)
+        self.assertEqual(2, response.json_body["total_rooms"])
+        self.assertEqual(2, len(response.json_body["rooms"]))
+
+        response = self.make_request(
+            "GET",
+            "/_synapse/admin/v1/rooms?empty_rooms=true",
+            access_token=self.admin_user_tok,
+        )
+        self.assertEqual(200, response.code, msg=response.json_body)
+        self.assertEqual(1, response.json_body["total_rooms"])
+        self.assertEqual(1, len(response.json_body["rooms"]))
+
     def test_single_room(self) -> None:
         """Test that a single room can be requested correctly"""
         # Create two test rooms