ReboundEmulator/Controllers/ConfigAndAssetsController.cs

using Microsoft.AspNetCore.Mvc;
using System.IO.Compression;
using System.Net;
using System.Reflection.Metadata.Ecma335;
using System.Text;

namespace NotPogo.Controllers
{
    [Route("/")]
    public class ConfigAndAssetsController(ILogger<ConfigAndAssetsController> logger) : Controller
    {
        private readonly ILogger<ConfigAndAssetsController> _logger = logger;

        public IActionResult Index() => Ok("Not Pogo Is Running!");

        // might aswell provide a minimal way to play the games supported
        [HttpGet]
        [Route("/play-game")]
        public IActionResult GetGamePage(string game)
        {
            var path = Path.Combine(AppContext.BaseDirectory, "StaticFiles", "GameAssets", game, "index.html");

            _logger.LogInformation("Attempting To Serve Game Applet At {Path}", path);
            return new ContentResult
            {
                Content = System.IO.File.Exists(path) ? System.IO.File.ReadAllText(path) : $"Game Not Found - {game}",
                ContentType = "text/html",
                StatusCode = (int)HttpStatusCode.OK
            };
        }

        [HttpGet]
        [Route("/get-jar")]
        public IActionResult GetAppletCode(string game)
        {
            var path = Path.Combine(AppContext.BaseDirectory, "StaticFiles", "JARs", game + "-en_US.jar");
            if (!System.IO.File.Exists(path))
                return NotFound("Applet Not Found");
            else
                return File(System.IO.File.ReadAllBytes(path), "application/x-java-archive", fileDownloadName: $"{game}.jar");
        }

        [HttpGet]
        [Route("/blank.html")]
        public IActionResult GetEmptyPage() => Ok();

        [HttpGet]
        [Route("/client-props.jsp")]
        public async Task<IActionResult> GetConfigAsync(string game)
        {
            var path = Path.Combine(AppContext.BaseDirectory, "StaticFiles", "Configs", $"{game}.txt");
            byte[] config = System.IO.File.Exists(path) ? await System.IO.File.ReadAllBytesAsync(path) : Encoding.UTF8.GetBytes($"Configration Missing For {game} :(");

            // client props needs to be gzip compressed for whatever reason (probably to throw off dumpers or something idk)
            byte[] compressed;
            using (var ms = new MemoryStream())
            {
                using (var gzip = new GZipStream(ms, CompressionLevel.Fastest, leaveOpen: true))
                {
                    await gzip.WriteAsync(config);
                }
                compressed = ms.ToArray();
            }

            return File(compressed, "text/plain");
        }

        [HttpGet]
        [Route("/assets")]
        public async Task<IActionResult> GetGameAssetAsync(string game, string assetPath)
        {
            var pathToAsset = Path.Combine(AppContext.BaseDirectory, "StaticFiles", "GameAssets", game, assetPath);
            byte[] assetBytes = System.IO.File.Exists(pathToAsset) ? 
                await System.IO.File.ReadAllBytesAsync(pathToAsset) : 
                Encoding.UTF8.GetBytes($"Missing Asset File For {game} - {assetPath}");

            _logger.LogInformation("Serving Game Asset {Game}/{FileName}", game, assetPath);
            return File(assetBytes, GetContentType(pathToAsset));
        }

        private string GetContentType(string assetFileName) => Path.GetExtension(assetFileName).ToLowerInvariant() switch
        {
            ".gif" => "image/gif",
            ".jpg" or ".jpeg" => "image/jpeg",
            ".au" => "audio/basic",
            ".xml" => "text/xml",
            ".dat" => "application/octet-stream",
            // ".txt" => "text/plain",
            _ => "application/octet-stream"
        };
    }
}