CSharpHttpServer/SimpleHttpServer/Types/RequestContext.cs

using System.Collections.ObjectModel;
using System.Net;

namespace SimpleHttpServer.Types;
public class RequestContext : IDisposable {

    public HttpListenerContext ListenerContext { get; }
    public ReadOnlyDictionary<string, string> ParsedParameters { get; internal set; }

    private TextReader? reqReader;
    /// <summary>
    /// THREADSAFE
    /// </summary>
    public TextReader ReqReader => reqReader ??= TextReader.Synchronized(new StreamReader(ListenerContext.Request.InputStream));

    private TextWriter? respWriter;
    /// <summary>
    /// THREADSAFE
    /// </summary>
    public TextWriter RespWriter => respWriter ??= TextWriter.Synchronized(new StreamWriter(ListenerContext.Response.OutputStream) { NewLine = "\n" });

    public RequestContext(HttpListenerContext listenerContext) {
        ListenerContext = listenerContext;
    }

    public async Task WriteLineToRespAsync(string resp) => await RespWriter.WriteLineAsync(resp);
    public async Task WriteToRespAsync(string resp) => await RespWriter.WriteAsync(resp);

    public void SetStatusCode(int status) {
        ListenerContext.Response.StatusCode = status;
        ListenerContext.Response.StatusDescription = GetDescriptionFromStatusCode(status);
    }

    public void SetStatusCode(HttpStatusCode status) => SetStatusCode((int) status);

    public async Task SetStatusCodeAndDisposeAsync(int status) {
        using (this) {
            SetStatusCode(status);
            await WriteToRespAsync("\n\n");
            await RespWriter.FlushAsync();
        }
    }

    public async Task SetStatusCodeAndDisposeAsync(HttpStatusCode status) {
        using (this) {
            SetStatusCode((int) status);
            await WriteToRespAsync("\n\n");
            await RespWriter.FlushAsync();
        }
    }


    public async Task SetStatusCodeAndDisposeAsync(int status, string description) {
        using (this) {
            ListenerContext.Response.StatusCode = status;
            ListenerContext.Response.StatusDescription = description;
            await WriteToRespAsync("\n\n");
            await RespWriter.FlushAsync();
        }
    }
    public async Task SetStatusCodeAndDisposeAsync(HttpStatusCode status, string description) => await SetStatusCodeAndDisposeAsync((int) status, description);


    public async Task WriteRedirect302AndDisposeAsync(string url) {
        ListenerContext.Response.AddHeader("Location", url);
        await SetStatusCodeAndDisposeAsync(HttpStatusCode.Redirect);
    }

    public void Dispose() {
        reqReader?.Dispose();
        respWriter?.Dispose();
        GC.SuppressFinalize(this);
    }


    // src: https://en.wikipedia.org/wiki/List_of_HTTP_status_codes
    private static string GetDescriptionFromStatusCode(int status) => status switch {
        100 => "Continue",
        101 => "Switching Protocols",
        102 => "Processing",
        103 => "Early Hints",

        200 => "OK",
        201 => "Created",
        202 => "Accepted",
        203 => "Non-Authoritative Information",
        204 => "No Content",

        205 => "Reset Content",
        206 => "Partial Content",
        207 => "Multi-Status",
        208 => "Already Reported",
        226 => "IM Used",

        300 => "Multiple Choices",
        301 => "Moved Permanently",
        302 => "Found",
        303 => "See Other",
        304 => "Not Modified",
        305 => "Use Proxy",
        306 => "Switch Proxy",
        307 => "Temporary Redirect",
        308 => "Permanent Redirect",

        400 => "Bad Request",
        401 => "Unauthorized",
        402 => "Payment Required",
        403 => "Forbidden",
        404 => "Not Found",
        405 => "Method Not Allowed",
        406 => "Not Acceptable",
        407 => "Proxy Authentication Required",
        408 => "Request Timeout",
        409 => "Conflict",
        410 => "Gone",
        411 => "Length Required",
        412 => "Precondition Failed",
        413 => "Payload Too Large",
        414 => "URI Too Long",
        415 => "Unsupported Media Type",
        416 => "Range Not Satisfiable",
        417 => "Expectation Failed",
        421 => "Misdirected Request",
        422 => "Unprocessable Content",
        423 => "Locked",
        424 => "Failed Dependency",
        425 => "Too Early",
        426 => "Upgrade Required",
        428 => "Precondition Required",
        429 => "Too Many Requests",
        431 => "Request Header Fields Too Large",
        451 => "Unavailable For Legal Reasons",

        500 => "Internal Server Error",
        501 => "Not Implemented",
        502 => "Bad Gateway",
        503 => "Service Unavailable",
        504 => "Gateway Timeout",
        505 => "HTTP Version Not Supported",
        506 => "Variant Also Negotiates",
        507 => "Insufficient Storage",
        508 => "Loop Detected",
        510 => "Not Extended",
        511 => "Network Authentication Required",

        _ => "Unknown",
    };
}