OnLootPlayer

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

namespace Oxide.Plugins
{
    [Info("Combat Loot Block", "RustPluginGenerator", "1.0.0")]
    [Description("Blocks looting of player corpses while the looter is in combat.")]
    public class CombatLootBlock : RustPlugin
    {
        private const string PermBypass = "combatlootblock.bypass";

        private class PluginConfig
        {
            [JsonProperty("Combat window (seconds)")]
            public float CombatWindow { get; set; } = 10f;

            [JsonProperty("Allow looting teammates")]
            public bool AllowTeammates { get; set; } = true;
        }

        private PluginConfig config;
        private readonly Dictionary<string, float> lastCombat = new Dictionary<string, float>();

        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 loot a player corpse while in combat."
            }, 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(PermBypass, this);
        }

        private void OnEntityTakeDamage(BaseCombatEntity entity, HitInfo info)
        {
            if (info == null || entity == null) return;
            var attacker = info.InitiatorPlayer;
            var victim = entity as BasePlayer;
            if (attacker == null || victim == null || attacker == victim) return;
            if (attacker.IsNpc || victim.IsNpc) return;
            lastCombat[attacker.UserIDString] = UnityEngine.Time.realtimeSinceStartup;
        }

        private void OnLootPlayer(BasePlayer player, BasePlayer looter)
        {
            if (player == null || looter == null || looter.IsNpc) return;
            if (permission.UserHasPermission(looter.UserIDString, PermBypass)) return;

            float last;
            if (!lastCombat.TryGetValue(looter.UserIDString, out last)) return;
            if (UnityEngine.Time.realtimeSinceStartup - last > config.CombatWindow) return;

            if (config.AllowTeammates && player.currentTeam != 0 && player.currentTeam == looter.currentTeam) return;

            looter.inventory.loot.Clear();
            looter.inventory.loot.SendImmediate();
            looter.ChatMessage(Msg("Blocked", looter.UserIDString));
        }

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