OnPhotoCapture

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

namespace Oxide.Plugins
{
    [Info("Photo Capture Guard", "RustPluginGenerator", "1.0.0")]
    [Description("Enforces a maximum photo size and a per-player cooldown before a camera photo is stored.")]
    public class PhotoCaptureGuard : RustPlugin
    {
        private const string PermUse = "photocaptureguard.use";

        private class PluginConfig
        {
            [JsonProperty("Maximum photo size in bytes")]
            public int MaxBytes = 98304;

            [JsonProperty("Capture cooldown in seconds")]
            public float CooldownSeconds = 3f;

            [JsonProperty("Require permission")]
            public bool RequirePermission = false;
        }

        private PluginConfig config;
        private readonly Dictionary<string, float> lastCapture = 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>
            {
                ["NoPermission"] = "You do not have permission to take photos.",
                ["TooLarge"] = "That photo is too large ({0} bytes, limit {1}).",
                ["Cooldown"] = "Wait {0:0.0}s before taking another photo."
            }, 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 OnPhotoCapture(PhotoEntity photoEntity, Item item, BasePlayer player, byte[] array)
        {
            if (photoEntity == null || item == null || player == null || array == null)
                return null;

            string userId = player.UserIDString;

            if (config.RequirePermission && !permission.UserHasPermission(userId, PermUse))
            {
                player.ChatMessage(Msg("NoPermission", userId));
                return true;
            }

            if (config.MaxBytes > 0 && array.Length > config.MaxBytes)
            {
                player.ChatMessage(Msg("TooLarge", userId, array.Length, config.MaxBytes));
                return true;
            }

            float now = Time.realtimeSinceStartup;
            float last;
            if (config.CooldownSeconds > 0f && lastCapture.TryGetValue(userId, out last))
            {
                float remaining = config.CooldownSeconds - (now - last);
                if (remaining > 0f)
                {
                    player.ChatMessage(Msg("Cooldown", userId, remaining));
                    return true;
                }
            }

            lastCapture[userId] = now;
            return null;
        }

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