Implement PostBeatmapFavouriteRequest

osu.Game/Online/API/Requests/PostBeatmapFavouriteRequest.cs

@@ -0,0 +1,36 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.IO.Network;
+using System.Net.Http;
+
+namespace osu.Game.Online.API.Requests
+{
+    public class PostBeatmapFavouriteRequest : APIRequest
+    {
+        private readonly int id;
+        private readonly BeatmapFavouriteAction action;
+
+        public PostBeatmapFavouriteRequest(int id, BeatmapFavouriteAction action)
+        {
+            this.id = id;
+            this.action = action;
+        }
+
+        protected override WebRequest CreateWebRequest()
+        {
+            var req = base.CreateWebRequest();
+            req.Method = HttpMethod.Post;
+            req.AddParameter(@"action", action.ToString().ToLowerInvariant());
+            return req;
+        }
+
+        protected override string Target => $@"beatmapsets/{id}/favourites";
+    }
+
+    public enum BeatmapFavouriteAction
+    {
+        Favourite,
+        UnFavourite
+    }
+}