StaticHandler.cs

namespace Hint;


using System.Net;
using System.Text;
using System.IO;


public static class StaticHandler
{
    public static async Task ServeStatic(HttpListenerResponse res, string root, string requestPath)
    {
        var localPath = requestPath.Replace('/', Path.DirectorySeparatorChar).TrimStart(Path.DirectorySeparatorChar);
        var file = string.IsNullOrEmpty(localPath)
        ? Path.Combine(root, "index.html")
        : Path.Combine(root, localPath);


        Console.WriteLine($"[LOG] Static file path: {file}");


        if (Directory.Exists(file)) file = Path.Combine(file, "index.html");


        if (!File.Exists(file))
        {
            Console.WriteLine($"[ERROR] File not found: {file}");
            res.StatusCode = 404;
            var bytes = Encoding.UTF8.GetBytes("Not Found");
            res.ContentType = "text/plain; charset=utf-8";
            await res.OutputStream.WriteAsync(bytes);
            return;
        }


        Console.WriteLine($"[LOG] Serving file: {file}");
        var ct = GetContentType(Path.GetExtension(file));
        res.ContentType = ct;
        using var fs = File.OpenRead(file);
        await fs.CopyToAsync(res.OutputStream);
    }


    private static string GetContentType(string ext) => ext.ToLowerInvariant() switch
    {
        ".html" => "text/html; charset=utf-8",
        ".css" => "text/css",
        ".js" => "application/javascript",
        ".png" => "image/png",
        ".jpg" => "image/jpeg",
        ".jpeg" => "image/jpeg",
        ".gif" => "image/gif",
        ".json" => "application/json",
        _ => "application/octet-stream"
    };
}