OnUserCommand

using System;
using System.Collections.Generic;
using System.Text;
using Newtonsoft.Json;
using Oxide.Core;
using Oxide.Core.Libraries.Covalence;
using UnityEngine;

namespace Oxide.Plugins
{
    [Info("Command Router", "RustPluginGenerator", "1.0.0")]
    [Description("Routes typed chat commands to console commands or replies based on a configurable table, and blocks others.")]
    public class CommandRouter : RustPlugin
    {
        private const string PermUse = "commandrouter.use";

        private PluginConfig config;

        private class PluginConfig
        {
            [JsonProperty("Routes (command => target)")]
            public Dictionary<string, Route> Routes = new Dictionary<string, Route>
            {
                ["discord"] = new Route { Reply = "Join us at discord.gg/example" },
                ["starter"] = new Route { Console = "kit givetoplayer {id} starter", Permission = "kit.starter" },
                ["where"] = new Route { Console = "printpos" }
            };

            [JsonProperty("Blocked routes reply")]
            public string BlockedReply = "You do not have permission to use /{0}.";
        }

        public class Route
        {
            [JsonProperty("Console command ({id} = player id)")]
            public string Console;

            [JsonProperty("Chat reply")]
            public string Reply;

            [JsonProperty("Permission")]
            public string Permission;
        }

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

        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>
            {
                ["Unknown"] = "Unknown command '/{0}'. Try /help."
            }, this);
        }

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

        private object OnUserCommand(IPlayer iplayer, string cmd, string[] args)
        {
            if (iplayer == null || !iplayer.IsConnected) return null;

            Route route;
            if (cmd == null || !config.Routes.TryGetValue(cmd.ToLowerInvariant(), out route) || route == null)
                return null;

            var player = iplayer.Object as BasePlayer;
            if (player == null) return null;

            if (!string.IsNullOrEmpty(route.Permission) && !permission.UserHasPermission(player.UserIDString, route.Permission))
            {
                player.ChatMessage(string.Format(config.BlockedReply, cmd));
                return true;
            }

            if (!string.IsNullOrEmpty(route.Console))
            {
                string line = route.Console.Replace("{id}", player.UserIDString);
                player.SendConsoleCommand(line);
            }

            if (!string.IsNullOrEmpty(route.Reply))
                player.ChatMessage(route.Reply);

            return true;
        }
    }
}