How to make a Rust high ping kick plugin (Oxide timer and permission)

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

namespace Oxide.Plugins
{
    [Info("Ping Kick", "RustPluginGenerator", "1.0.0")]
    [Description("Warns and kicks players whose average ping stays above a limit for several checks")]
    public class PingKick : RustPlugin
    {
        private const string PermExempt = "pingkick.exempt";
        private const string PermAdmin = "pingkick.admin";

        private PluginConfig config;
        private Timer scanTimer;
        private readonly Dictionary<ulong, int> streaks = new Dictionary<ulong, int>();

        private class PluginConfig
        {
            [JsonProperty("Max Ping")]
            public int MaxPing = 350;

            [JsonProperty("Checks Before Kick")]
            public int ChecksBeforeKick = 3;

            [JsonProperty("Check Interval Seconds")]
            public float CheckInterval = 30f;

            [JsonProperty("Warn Before Kick")]
            public bool WarnBeforeKick = true;

            [JsonProperty("Kick Reason")]
            public string KickReason = "High ping";
        }

        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>
            {
                ["Kick.Warning"] = "Warning: your ping is above {0} ms. You will be kicked if it does not drop. Try reconnecting.",
                ["Kick.Reason"] = "Kicked: average ping above {0} ms",
                ["Command.NoPermission"] = "You do not have permission to use this command.",
                ["Command.Check"] = "Ping scan complete. Tracked: {0}. Highest ping: {1} ms. Limit: {2} ms.",
                ["Command.Status"] = "Ping check every {0}s, limit {1} ms, {2} consecutive failures trigger a kick.",
                ["Usage"] = "Usage: /pingkick check | /pingkick status"
            }, 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(PermExempt, this);
            permission.RegisterPermission(PermAdmin, this);
        }

        private void OnServerInitialized()
        {
            if (config.MaxPing < 50) config.MaxPing = 50;
            if (config.ChecksBeforeKick < 1) config.ChecksBeforeKick = 1;
            if (config.CheckInterval < 1f) config.CheckInterval = 1f;

            scanTimer = timer.Every(config.CheckInterval, Scan);
        }

        private void Unload()
        {
            if (scanTimer != null)
            {
                scanTimer.Destroy();
                scanTimer = null;
            }
            streaks.Clear();
        }

        private void OnPlayerDisconnected(BasePlayer player, string reason)
        {
            if (player == null) return;
            streaks.Remove(player.userID.Get());
        }

        private void Scan()
        {
            if (config == null) return;

            foreach (var player in BasePlayer.activePlayerList)
            {
                if (player == null || player.IsNpc || !player.IsConnected || player.IsSleeping()) continue;
                if (permission.UserHasPermission(player.UserIDString, PermExempt)) continue;

                var connection = player.net?.connection;
                if (connection == null) continue;

                int ping = Network.Net.sv.GetAveragePing(connection);
                if (ping <= 0) continue;

                ulong id = player.userID.Get();
                if (ping <= config.MaxPing)
                {
                    if (streaks.ContainsKey(id)) streaks[id] = 0;
                    continue;
                }

                int streak;
                streaks.TryGetValue(id, out streak);
                streak++;
                streaks[id] = streak;

                if (streak < config.ChecksBeforeKick) continue;

                streaks[id] = 0;
                KickHighPing(player);
            }
        }

        private void KickHighPing(BasePlayer player)
        {
            if (player == null || !player.IsConnected) return;

            if (config.WarnBeforeKick)
            {
                player.ChatMessage(Msg("Kick.Warning", player.UserIDString, config.MaxPing));
            }

            string reason = Msg("Kick.Reason", null, config.MaxPing);
            player.Kick(reason);
        }

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

            string sub = args != null && args.Length > 0 ? args[0].ToLowerInvariant() : "";

            if (sub == "check")
            {
                int highest = 0;
                int tracked = 0;

                foreach (var p in BasePlayer.activePlayerList)
                {
                    if (p == null || p.IsNpc || !p.IsConnected) continue;
                    var connection = p.net?.connection;
                    if (connection == null) continue;
                    int ping = Network.Net.sv.GetAveragePing(connection);
                    if (ping > highest) highest = ping;
                    if (streaks.ContainsKey(p.userID.Get())) tracked++;
                }

                player.ChatMessage(Msg("Command.Check", player.UserIDString, tracked, highest, config.MaxPing));
                return;
            }

            if (sub == "status")
            {
                player.ChatMessage(Msg("Command.Status", player.UserIDString, config.CheckInterval, config.MaxPing, config.ChecksBeforeKick));
                return;
            }

            player.ChatMessage(Msg("Usage", player.UserIDString));
        }
    }
}