OnEntityDistanceCheck

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

namespace Oxide.Plugins
{
    [Info("ExtendedContainerRange", "RustPluginGenerator", "1.0.0")]
    [Description("Gives permitted players a longer interaction range on storage containers.")]
    public class ExtendedContainerRange : RustPlugin
    {
        private const string PermUse = "extendedcontainerrange.use";

        private PluginConfig config;

        private class PluginConfig
        {
            [JsonProperty("Extended distance in metres")]
            public float ExtendedDistance = 12f;
        }

        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 System.Collections.Generic.Dictionary<string, string>
            {
                ["Range"] = "Your container interaction range is {0} metres.",
                ["NoAccess"] = "You do not have access to extended container range."
            }, this);
        }

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

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

        [ChatCommand("extrange")]
        private void CmdRange(BasePlayer player, string command, string[] args)
        {
            if (player == null) return;
            if (!permission.UserHasPermission(player.UserIDString, PermUse))
            {
                SendReply(player, Msg("NoAccess", player.UserIDString));
                return;
            }
            SendReply(player, Msg("Range", player.UserIDString, config.ExtendedDistance));
        }

        private object OnEntityDistanceCheck(StorageContainer container, BasePlayer player, uint id, string debugName, float maximumDistance, bool checkParent)
        {
            if (container == null || player == null || player.eyes == null) return null;
            if (!permission.UserHasPermission(player.UserIDString, PermUse)) return null;

            float distance = Vector3.Distance(container.transform.position, player.eyes.position);
            if (distance <= maximumDistance) return null;
            return distance <= config.ExtendedDistance;
        }
    }
}