OnServerRestartInterrupt

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

namespace Oxide.Plugins
{
    [Info("Restart Interrupt Guard", "RustPluginGenerator", "1.0.0")]
    [Description("Blocks accidental cancellation of a scheduled server restart.")]
    public class RestartInterruptGuard : RustPlugin
    {
        private const string PermAdmin = "restartinterruptguard.admin";

        private PluginConfig config;

        private class PluginConfig
        {
            [JsonProperty("Block interruption of scheduled restart")]
            public bool BlockInterrupt { get; set; } = true;
        }

        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>
            {
                ["Blocked"] = "Restart interruption is currently blocked.",
                ["Allowed"] = "Restart interruption is currently allowed.",
                ["Toggled"] = "Restart interruption is now {0}.",
                ["NoPerm"] = "You do not have permission to use this command."
            }, 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 object OnServerRestartInterrupt()
        {
            if (!config.BlockInterrupt) return null;
            return true;
        }

        [ChatCommand("restartguard")]
        private void CmdRestartGuard(BasePlayer player, string command, string[] args)
        {
            if (player == null) return;
            if (!permission.UserHasPermission(player.UserIDString, PermAdmin))
            {
                player.ChatMessage(Msg("NoPerm", player.UserIDString));
                return;
            }

            player.ChatMessage(Msg(config.BlockInterrupt ? "Blocked" : "Allowed", player.UserIDString));
        }

        [ConsoleCommand("restartguard.toggle")]
        private void CcmdToggle(ConsoleSystem.Arg arg)
        {
            if (arg == null) return;
            if (!arg.IsAdmin && (arg.Player() == null || !permission.UserHasPermission(arg.Player().UserIDString, PermAdmin)))
            {
                arg.ReplyWith(Msg("NoPerm"));
                return;
            }

            config.BlockInterrupt = !config.BlockInterrupt;
            SaveConfig();
            arg.ReplyWith(Msg("Toggled", null, config.BlockInterrupt ? "blocked" : "allowed"));
        }
    }
}