OnEntityStabilityCheck

using System.Linq;
using System;
using System.Collections.Generic;
using Newtonsoft.Json;
using Oxide.Core.Plugins;
using UnityEngine;

namespace Oxide.Plugins
{
    [Info("Stability Shield", "RustPluginGenerator", "1.0.0")]
    [Description("Skips building stability checks for bases owned by whitelisted players while protection is enabled.")]
    public class StabilityShield : RustPlugin
    {
        private const string PermAdmin = "stabilityshield.admin";

        private PluginConfig config;
        private bool protectionActive;
        private static readonly object SkipMarker = new object();

        private class PluginConfig
        {
            [JsonProperty("Enable protection on load")]
            public bool EnabledOnLoad { get; set; } = true;

            [JsonProperty("Whitelisted Steam IDs (cupboard owner)")]
            public List<string> WhitelistedOwners { get; set; } = new List<string>();
        }

        protected override void LoadDefaultConfig() => config = new PluginConfig();

        protected override void LoadConfig()
        {
            base.LoadConfig();
            try
            {
                config = Config.ReadObject<PluginConfig>();
                if (config == null) throw new Exception();
            }
            catch
            {
                PrintWarning("Configuration file is invalid, using defaults");
                LoadDefaultConfig();
            }
            SaveConfig();
        }

        protected override void SaveConfig() => Config.WriteObject(config);

        protected override void LoadDefaultMessages()
        {
            lang.RegisterMessages(new Dictionary<string, string>
            {
                ["NoPermission"] = "You do not have permission to use this command.",
                ["Enabled"] = "Stability protection is now ON for {0} whitelisted owners.",
                ["Disabled"] = "Stability protection is now OFF."
            }, this);
        }

        private string Msg(string key, string userId = null, params object[] args) => string.Format(lang.GetMessage(key, this, userId), args);

        private void Init()
        {
            permission.RegisterPermission(PermAdmin, this);
        }

        private void OnServerInitialized()
        {
            protectionActive = config.EnabledOnLoad;
        }

        [ChatCommand("stability")]
        private void CmdStability(BasePlayer player, string command, string[] args)
        {
            if (player == null) return;
            if (!player.IsAdmin && !permission.UserHasPermission(player.UserIDString, PermAdmin))
            {
                player.ChatMessage(Msg("NoPermission", player.UserIDString));
                return;
            }

            protectionActive = !protectionActive;
            player.ChatMessage(protectionActive
                ? Msg("Enabled", player.UserIDString, config.WhitelistedOwners.Count)
                : Msg("Disabled", player.UserIDString));
        }

        private object OnEntityStabilityCheck(StabilityEntity stabilityEntity)
        {
            if (!protectionActive || stabilityEntity == null) return null;

            var privilege = stabilityEntity.GetBuildingPrivilege();
            if (privilege == null || privilege.OwnerID == 0UL) return null;

            if (!config.WhitelistedOwners.Contains(privilege.OwnerID.ToString())) return null;

            return SkipMarker;
        }
    }
}