CanFastTrackCraftTask

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

namespace Oxide.Plugins
{
    [Info("FastTrackPermission", "RustPluginGenerator", "1.0.0")]
    [Description("Restricts fast-track crafting in the queue to players with a permission")]
    public class FastTrackPermission : RustPlugin
    {
        private const string PermUse = "fasttrackpermission.use";

        private PluginConfig config;

        private class PluginConfig
        {
            [JsonProperty("Allow by default when no permission plugin is used")]
            public bool AllowByDefault { get; set; } = false;

            [JsonProperty("Blocked item shortnames")]
            public List<string> BlockedItems { get; set; } = new List<string> { "explosive.timed", "ammo.rocket.basic" };
        }

        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>
            {
                ["NoPermission"] = "You do not have permission to fast-track crafting.",
                ["ItemBlocked"] = "{0} cannot be fast-tracked on this server."
            }, 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 object CanFastTrackCraftTask(ItemCrafter itemCrafter, ItemCraftTask itemCraftTask, int taskID)
        {
            if (itemCrafter == null || itemCraftTask == null || itemCraftTask.blueprint == null)
                return null;

            var player = itemCrafter.GetComponent<BasePlayer>();
            if (player == null || !player.IsConnected || player.IsNpc)
                return null;

            string shortname = itemCraftTask.blueprint.targetItem != null ? itemCraftTask.blueprint.targetItem.shortname : null;
            if (shortname != null && config.BlockedItems.Contains(shortname))
            {
                player.ChatMessage(Msg("ItemBlocked", player.UserIDString, itemCraftTask.blueprint.targetItem.displayName.english));
                return false;
            }

            if (permission.UserHasPermission(player.UserIDString, PermUse))
                return null;

            if (config.AllowByDefault)
                return null;

            player.ChatMessage(Msg("NoPermission", player.UserIDString));
            return false;
        }
    }
}