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tesses.webserver/Tesses.WebServer/TessesServer.cs

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Initial Commit
2022-04-02 18:59:12 +00:00
using System;
using System.Net;
using System.Net.Sockets;
using System.Threading.Tasks;
using System.IO;
using System.Threading;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using HeyRed.Mime;
using Newtonsoft.Json;
namespace Tesses.WebServer
{
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public static class Extensions
{
public static async Task WriteHeadersAsync(this ServerContext ctx)
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{
string status_line = $"HTTP/1.1 {ctx.StatusCode} {StatusCodeMap.GetStatusString(ctx.StatusCode)}\r\n";
StringBuilder b = new StringBuilder(status_line);
foreach (var hdr in ctx.ResponseHeaders)
{
foreach (var v in hdr.Value)
{
b.Append($"{hdr.Key}: {v}\r\n");
}
}
b.Append("\r\n");
var data = Encoding.UTF8.GetBytes(b.ToString());
await ctx.NetworkStream.WriteAsync(data, 0, data.Length);
}
public static async Task SendFileAsync(this ServerContext ctx, string file)
{
using (var strm = File.OpenRead(file))
{
await ctx.SendStreamAsync( strm, MimeTypesMap.GetMimeType(file));
}
}
public static async Task SendExceptionAsync(this ServerContext ctx, Exception ex)
{
string name = ex.GetType().FullName;
string j = $"<html><head><title>{WebUtility.HtmlEncode(name)} thrown</title></head><body><h1>{WebUtility.HtmlEncode(name)} thrown</h1><h3>Description: {WebUtility.HtmlEncode(ex.Message)}</h3></body></html>";
ctx.StatusCode = 500;
await ctx.SendTextAsync(j);
}
public static async Task SendJsonAsync(this ServerContext ctx,object value)
{
await ctx.SendTextAsync(JsonConvert.SerializeObject(value), "application/json");
}
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public static async Task SendTextAsync(this ServerContext ctx, string data, string contentType = "text/html")
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{
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await ctx.SendBytesAsync(Encoding.UTF8.GetBytes(data), contentType);
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}
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public static async Task SendBytesAsync(this ServerContext ctx, byte[] array, string contentType = "application/octet-stream")
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{
using (var ms = new MemoryStream(array))
{
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await ctx.SendStreamAsync( ms, contentType);
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}
}
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public static T2 GetFirst<T1,T2>(this Dictionary<T1,List<T2>> args,T1 key)
{
return args[key][0];
}
public static void Add<T1,T2>(this Dictionary<T1,List<T2>> list,T1 key,T2 item)
{
if (list.ContainsKey(key))
{
list[key].Add(item);
}
else
{
List<T2> items = new List<T2>();
items.Add(item);
list.Add(key, items);
}
}
public static void AddRange<T1,T2>(this Dictionary<T1,List<T2>> list,T1 key,IEnumerable<T2> items)
{
if (list.ContainsKey(key))
{
list[key].AddRange(items);
}
else
{
List<T2> items2 = new List<T2>();
items2.AddRange(items);
list.Add(key, items2);
}
}
public static bool EndsWith(this StringBuilder sb, string test,
StringComparison comparison)
{
if (sb.Length < test.Length)
return false;
string end = sb.ToString(sb.Length - test.Length, test.Length);
return end.Equals(test, comparison);
}
}
public class NotFoundServer : Server
{
public NotFoundServer(string html)
{
_html = html;
}
public NotFoundServer()
{
_html = "<html><head><title>File {url} not found</title></head><body><h1>404 Not Found</h1><h4>{url}</h4></body></html>";
}
string _html;
public override async Task GetAsync(ServerContext ctx)
{
ctx.StatusCode = 404;
await ctx.SendTextAsync( _html.Replace("{url}", WebUtility.HtmlEncode(ctx.UrlPath)));
}
}
public class StaticServer : Server
{
string _path;
IServer _server;
public StaticServer(string path)
{
_path = path;
_server = new NotFoundServer();
_defaultFileNames = new string[] {"index.html","index.htm","default.html","default.htm" };
}
string[] _defaultFileNames;
public StaticServer(string path,string[] defaultFileNames,IServer notfoundserver)
{
_path = path;
_server = notfoundserver;
_defaultFileNames = defaultFileNames;
}
public bool DefaultFileExists(string path,out string name)
{
foreach(var def in _defaultFileNames)
{
name = Path.Combine(path, def);
if(File.Exists(name))
{
return true;
}
}
name = "";
return false;
}
public override async Task GetAsync(ServerContext ctx)
{
string someUrl = Path.Combine(_path,WebUtility.UrlDecode(ctx.UrlPath.Substring(1)).Replace('/', Path.DirectorySeparatorChar));
Console.WriteLine(someUrl);
if (Directory.Exists(someUrl))
{
string name;
if(DefaultFileExists(someUrl,out name))
{
await ctx.SendFileAsync(name);
}
}
else if (File.Exists(someUrl))
{
await ctx.SendFileAsync(someUrl);
}
else
{
await _server.GetAsync(ctx);
}
}
}
public abstract class Server : IServer
{
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public bool CorsHeader = true;
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public abstract Task GetAsync(ServerContext ctx);
public virtual async Task PostAsync(ServerContext ctx)
{
ctx.StatusCode = (int)HttpStatusCode.MethodNotAllowed;
await ctx.SendTextAsync("Method Not Supported");
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}
public virtual async Task OptionsAsync(ServerContext ctx)
{
await ctx.WriteHeadersAsync();
ctx.NetworkStream.Close();
}
public virtual async Task OtherAsync(ServerContext ctx)
{
ctx.StatusCode = (int)HttpStatusCode.MethodNotAllowed;
await ctx.SendTextAsync("Method Not Supported");
}
public virtual async Task<bool> BeforeAsync(ServerContext ctx)
{
if(CorsHeader)
{
ctx.ResponseHeaders.Add("Access-Control-Allow-Origin", "*");
ctx.ResponseHeaders.Add("Access-Control-Allow-Headers", "Cache-Control, Pragma, Accept, Origin, Authorization, Content-Type, X-Requested-With");
ctx.ResponseHeaders.Add("Access-Control-Allow-Methods", "GET, POST");
ctx.ResponseHeaders.Add("Access-Control-Allow-Credentials", "true");
}
return await Task.FromResult(false);
}
}
public sealed class MountableServer : Server
{
Dictionary<string, IServer> _servers = new Dictionary<string, IServer>();
public MountableServer(IServer root)
{
_root = root;
}
IServer _root;
private KeyValuePair<string,IServer> GetFromPath(ServerContext ctx)
{
//bool j = false;
foreach(var item in _servers.Reverse())
{
if(ctx.UrlPath.StartsWith(item.Key,StringComparison.Ordinal))
{
return item;
}
}
Console.WriteLine("HERE WE ARE");
return new KeyValuePair<string, IServer>("/",_root);
}
/// <summary>
/// Mount the specified url and server.
/// Must mount like this
/// /somePath0
/// /somePath0/someSubPath0
/// /somePath0/someSubPath0/someSubSubPath0
/// /somePath0/someSubPath0/someSubSubPath1
/// /somePath0/someSubPath1
/// /somePath0/someSubPath1/someSubSubPath0
/// /somePath0/someSubPath1/someSubSubPath1
/// </summary>
/// <param name="url">URL.</param>
/// <param name="server">Server.</param>
public void Mount(string url,IServer server)
{
_servers.Add(url, server);
}
public void Unmount(string url)
{
_servers.Remove(url);
}
public void UnmountAll()
{
_servers.Clear();
}
public override async Task GetAsync(ServerContext ctx)
{
var v = GetFromPath(ctx);
string url = '/' + ctx.UrlPath.Substring(v.Key.Length).TrimStart('/');
ctx.UrlPath = url;
await v.Value.GetAsync(ctx);
}
public override async Task PostAsync(ServerContext ctx)
{
var v = GetFromPath(ctx);
string url = '/' + ctx.UrlPath.Substring(v.Key.Length).TrimStart('/');
ctx.UrlPath = url;
await v.Value.PostAsync(ctx);
}
public override async Task<bool> BeforeAsync(ServerContext ctx)
{
var v = GetFromPath(ctx);
string old=ctx.UrlPath;
string url = '/' + ctx.UrlPath.Substring(v.Key.Length).TrimStart('/');
ctx.UrlPath = url;
var res=await v.Value.BeforeAsync(ctx);
ctx.UrlPath = old;
return res;
}
public override async Task OptionsAsync(ServerContext ctx)
{
var v = GetFromPath(ctx);
string url = '/' + ctx.UrlPath.Substring(v.Key.Length).TrimStart('/');
ctx.UrlPath = url;
await v.Value.OptionsAsync(ctx);
}
public override async Task OtherAsync(ServerContext ctx)
{
var v = GetFromPath(ctx);
string url = '/' + ctx.UrlPath.Substring(v.Key.Length).TrimStart('/');
ctx.UrlPath = url;
await v.Value.OtherAsync(ctx);
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}
}
public interface IServer
{
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Task<bool> BeforeAsync(ServerContext ctx);
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Task GetAsync(ServerContext ctx);
Task PostAsync(ServerContext ctx);
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Task OptionsAsync(ServerContext ctx);
Task OtherAsync(ServerContext ctx);
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}
public sealed class HttpServerListener
{
IServer _server;
TcpListener _listener;
public HttpServerListener(IPEndPoint endPoint,IServer server)
{
_listener = new TcpListener(endPoint);
_server = server;
}
public async Task ListenAsync(CancellationToken token)
{
_listener.Start();
using (var r = token.Register(() => _listener.Stop())) {
while (!token.IsCancellationRequested)
{
var socket=await _listener.AcceptTcpClientAsync();
await CommunicateHostAsync(socket);
}
}
}
private string ReadHeaders(NetworkStream strm)
{
StringBuilder s = new StringBuilder();
var decoder = Encoding.UTF8.GetDecoder();
var nextChar = new char[1];
while (!s.EndsWith("\r\n\r\n",StringComparison.Ordinal))
{
int data = strm.ReadByte();
if(data == -1)
{
break;
}
int charCount=decoder.GetChars(new byte[] { (byte)data }, 0, 1, nextChar, 0);
if (charCount == 0) continue;
s.Append(nextChar);
}
return s.ToString();
}
private Dictionary<string,List<string>> Headers(string s,out string req_line)
{
Dictionary<string, List<string>> items = new Dictionary<string, List<string>>();
string[] lines = s.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
req_line = lines[0];
for(int i=1;i<lines.Length;i++)
{
var line_split=lines[i].Split(new[] { ": " },2,StringSplitOptions.None);
if (line_split.Length == 2)
{
items.Add(line_split[0], line_split[1]);
}
}
return items;
}
private async Task CommunicateHostAsync(TcpClient clt)
{
//<METHOD> <PATH> HTTP/1.1\r\n
//HEADER1\r\n
//HEADER2\r\n
//......
//HEADERN\r\n
//\r\n
//OPTIONAL REQUEST BODY
//RESPONSE
using (NetworkStream strm = clt.GetStream())
{
string request_line = "";
string res=ReadHeaders(strm);
var headers=Headers(res,out request_line);
// {Method} {Path} HTTP/1.1
ServerContext ctx=null;
string[] request=request_line.Split(new char[] { ' ' }, 3);
string method = request[0];
try
{
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string path = request[1];
string ver = request[2];
ctx = new ServerContext(method, strm, path, headers);
if (!await _server.BeforeAsync(ctx))
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{
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switch (method)
{
case "HEAD":
case "GET":
await _server.GetAsync(ctx);
break;
case "POST":
await _server.PostAsync(ctx);
break;
case "OPTIONS":
await _server.OptionsAsync(ctx);
break;
default:
await _server.OtherAsync(ctx);
break;
}
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}
}catch(Exception ex)
{
try
{
await ctx.SendExceptionAsync(ex);
}catch(Exception ex2)
{
_ = ex2;
}
}
}
}
//protected abstract Task<IResult> Get(string url,Dictionary<string,string> headers);
//protected abstract Task GetAsync(ServerContext ctx);
}
}