OnTurretAssign

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

namespace Oxide.Plugins
{
    [Info("TurretTeamAuth", "RustPluginGenerator", "1.0.0")]
    [Description("Restricts who can be authorized on auto turrets to members of the operator's team")]
    public class TurretTeamAuth : RustPlugin
    {
        private const string PermUse = "turretteamauth.use";

        private PluginConfig config;

        private class PluginConfig
        {
            [JsonProperty("Only allow team members to be authorized")]
            public bool TeamOnly { get; set; } = true;
        }

        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>
            {
                ["NotTeamMember"] = "You can only authorize your own teammates on this turret."
            }, this);
        }

        private string Msg(string key, string userId = null) => lang.GetMessage(key, this, userId);

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

        private object OnTurretAssign(AutoTurret autoTurret, ulong userId, BasePlayer player)
        {
            if (autoTurret == null || player == null) return null;
            if (!config.TeamOnly) return null;
            if (!permission.UserHasPermission(player.UserIDString, PermUse)) return null;

            // Operators without a team may only authorize themselves.
            if (player.currentTeam == 0)
            {
                if (userId == player.userID.Get()) return null;
                player.ChatMessage(Msg("NotTeamMember", player.UserIDString));
                return false;
            }

            var team = RelationshipManager.ServerInstance.FindTeam(player.currentTeam);
            if (team == null || !team.members.Contains(userId))
            {
                player.ChatMessage(Msg("NotTeamMember", player.UserIDString));
                return false;
            }

            return null;
        }
    }
}