AutoCupboard.cs

using System.Reflection;
using Oxide.Core.Plugins;
using Oxide.Game.Rust;
using ProtoBuf;
using UnityEngine;

namespace Oxide.Plugins
{
    [Info("AutoCupboard", "DefaultPlayer", "1.1")]
    public class AutoCupboard : RustPlugin
    {
        private static readonly MethodInfo UpdateAllPlayersMethod = typeof (BuildingPrivlidge).GetMethod("UpdateAllPlayers", BindingFlags.Instance | BindingFlags.NonPublic);
        [PluginReference]
        private Plugin Friends;

        private static void Authorize(BuildingPrivlidge cupboard, ulong userid)
        {
            var player = RustCore.FindPlayerById(userid);
            cupboard.authorizedPlayers.RemoveAll(pni => pni.userid == userid);
            cupboard.authorizedPlayers.Add(new PlayerNameID { userid = userid, username = player ? player.displayName : string.Empty });
        }

        private void OnEntityBuilt(Planner plan, GameObject entity)
        {
            var cupboard = entity.GetComponent<BuildingPrivlidge>();
            if (!cupboard)
                return;
            try
            {
                var userid = plan.GetOwnerPlayer().userID;
                Authorize(cupboard, userid);
                var friends = Friends?.Call<ulong[]>("GetFriends", userid);
                if (friends == null)
                    return;
                foreach (var friend in friends)
                    Authorize(cupboard, friend);
            }
            finally
            {
                UpdateAllPlayersMethod.Invoke(cupboard, null);
                cupboard.SendNetworkUpdate();
            }
        }
    }
}