OnPlayerPingsSend

using System.Linq;
using System;
using System.Collections.Generic;
using Newtonsoft.Json;
using ProtoBuf;
using Oxide.Core;

namespace Oxide.Plugins
{
    [Info("Ping Type Filter", "RustPluginGenerator", "1.0.0")]
    [Description("Filters selected ping types out of the list sent to a player's client")]
    public class PingTypeFilter : RustPlugin
    {
        private const string PermUse = "pingtypefilter.use";

        private PluginConfig config;

        private class PluginConfig
        {
            [JsonProperty("Hidden ping types")]
            public List<int> HiddenTypes = new List<int>();
        }

        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>
            {
                ["Reloaded"] = "Ping filter reloaded. Hiding {0} ping type(s).",
                ["NoPermission"] = "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(PermUse, this);
        }

        private void OnPlayerPingsSend(BasePlayer player, MapNoteList mapNoteList)
        {
            if (player == null || mapNoteList == null || mapNoteList.notes == null || config.HiddenTypes.Count == 0)
                return;

            for (int i = mapNoteList.notes.Count - 1; i >= 0; i--)
            {
                MapNote note = mapNoteList.notes[i];
                if (note == null) continue;

                if (config.HiddenTypes.Contains((int)note.icon))
                    mapNoteList.notes.RemoveAt(i);
            }
        }

        [ChatCommand("pingfilter")]
        private void CmdPingFilter(BasePlayer player, string command, string[] args)
        {
            if (player == null) return;
            if (!permission.UserHasPermission(player.UserIDString, PermUse))
            {
                SendReply(player, Msg("NoPermission", player.UserIDString));
                return;
            }

            LoadConfig();
            SendReply(player, Msg("Reloaded", player.UserIDString, config.HiddenTypes.Count));
        }
    }
}