OnPlayerUnvanish

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

namespace Oxide.Plugins
{
    [Info("Unvanish Guard", "RustPluginGenerator", "1.0.0")]
    [Description("Restricts and logs the debugging invis unvanish command.")]
    public class UnvanishGuard : RustPlugin
    {
        private class PluginConfig
        {
            [Newtonsoft.Json.JsonProperty("Allow admins to unvanish")]
            public bool AllowAdmins { get; set; } = true;
        }

        private const string PermBypass = "unvanishguard.bypass";
        private PluginConfig config;
        private readonly List<string> log = 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>
            {
                ["Blocked"] = "You cannot unvanish on this server.",
                ["Logged"] = "Unvanish attempt by {0} ({1})."
            }, this);
        }

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

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

        private object OnPlayerUnvanish(BasePlayer player)
        {
            if (player == null) return null;

            bool allowed = config.AllowAdmins && player.IsAdmin;
            if (!allowed && permission.UserHasPermission(player.UserIDString, PermBypass))
                allowed = true;

            if (allowed) return null;

            log.Add(string.Format("{0} {1}", DateTime.UtcNow.ToString("u"), player.displayName));
            if (log.Count > 50) log.RemoveAt(0);

            player.ChatMessage(Msg("Blocked", player.UserIDString));
            return true;
        }

        [ConsoleCommand("unvanishguard.log")]
        private void CmdLog(ConsoleSystem.Arg arg)
        {
            if (arg == null || !arg.IsAdmin) return;
            if (log.Count == 0)
            {
                arg.ReplyWith("No unvanish attempts recorded.");
                return;
            }
            foreach (string entry in log)
                arg.ReplyWith(entry);
        }

        private void Unload()
        {
            log.Clear();
        }
    }
}