add API model and request

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

@@ -0,0 +1,31 @@
+// 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 System.Net.Http;
+using osu.Framework.IO.Network;
+using osu.Game.Online.API.Requests.Responses;
+
+namespace osu.Game.Online.API.Requests
+{
+    public class FriendAddRequest : APIRequest<APIRelation>
+    {
+        private readonly int targetId;
+
+        public FriendAddRequest(int targetId)
+        {
+            this.targetId = targetId;
+        }
+
+        protected override WebRequest CreateWebRequest()
+        {
+            var req = base.CreateWebRequest();
+
+            req.Method = HttpMethod.Post;
+            req.AddParameter("target", targetId.ToString(), RequestParameterType.Query);
+
+            return req;
+        }
+
+        protected override string Target => @"friends";
+    }
+}

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

@@ -0,0 +1,27 @@
+// 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 System.Net.Http;
+using osu.Framework.IO.Network;
+
+namespace osu.Game.Online.API.Requests
+{
+    public class FriendDeleteRequest : APIRequest
+    {
+        private readonly int targetId;
+
+        public FriendDeleteRequest(int targetId)
+        {
+            this.targetId = targetId;
+        }
+
+        protected override WebRequest CreateWebRequest()
+        {
+            var req = base.CreateWebRequest();
+            req.Method = HttpMethod.Delete;
+            return req;
+        }
+
+        protected override string Target => $@"friends/{targetId}";
+    }
+}

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

@@ -6,7 +6,7 @@ using osu.Game.Online.API.Requests.Responses;
 
 namespace osu.Game.Online.API.Requests
 {
-    public class GetFriendsRequest : APIRequest<List<APIUser>>
+    public class GetFriendsRequest : APIRequest<List<APIRelation>>
     {
         protected override string Target => @"friends";
     }

osu.Game/Online/API/Requests/Responses/APIRelation.cs

@@ -0,0 +1,28 @@
+// 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 Newtonsoft.Json;
+
+namespace osu.Game.Online.API.Requests.Responses
+{
+    public class APIRelation
+    {
+        [JsonProperty("target_id")]
+        public int TargetID { get; set; }
+
+        [JsonProperty("relation_type")]
+        public RelationType RelationType { get; set; }
+
+        [JsonProperty("mutual")]
+        public bool Mutual { get; set; }
+
+        [JsonProperty("target")]
+        public APIUser? TargetUser { get; set; }
+    }
+
+    public enum RelationType
+    {
+        Friend,
+        Block,
+    }
+}