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Mike Nolan 2022-10-26 18:39:53 -05:00
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The MIT License (MIT)
=====================
Copyright © `2022` `Tesses (Mike Nolan)`
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the “Software”), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

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Finally Websockets specifically for Tesses.WebServer
====================================================
I implemented websockets for [Tesses.WebServer](https://gitlab.tesses.net/tesses50/tesses.webserver)
How To Use (Class inheriting from Server)
==========================================
public class SomeClass : Server
{
public override async Task GetAsync(ServerContext ctx)
{
await ctx.StartWebSocketConnectionAsync(async(sendMessage,ping,token)=>{
await sendMessage(WebSocketMessage.Create("Greetings"));
//send messages from here or add sendMessage to List<Func<WebSocketMessage,Task>>
while(!token.IsCancellationRequested)
{
await Task.Delay(100); //you might want to ping here too await ping(new byte[]{42,42,42,42});
}
},async(message)=>{
//message
bool isBinary=message.Binary;
if(isBinary)
{
byte[] data = message.Data;
}else{
string text = message.Text;
//or SomeType data = message.DecodeJson<SomeType>(); for json Data
}
},(clean)=>{
//the socket is closed
//clean means clean exit
});
}
}
How To Use (RoutableServer)
==============================
routable.Add("/socket",async(ctx)=>{
await ctx.StartWebSocketConnectionAsync(async(sendMessage,ping,token)=>{
await sendMessage(WebSocketMessage.Create("Greetings"));
//send messages from here or add sendMessage to List&lt;Func&lt;WebSocketMessage,Task&gt;&gt;
while(!token.IsCancellationRequested)
{
await Task.Delay(100); //you might want to ping here too await ping(new byte[]{42,42,42,42});
}
},async(message)=>{
//message
bool isBinary=message.Binary;
if(isBinary)
{
byte[] data = message.Data;
}else{
string text = message.Text;
//or SomeType data = message.DecodeJson<SomeType>(); for json Data
}
},(clean)=>{
//the socket is closed
//clean means clean exit
});
});
How To Use (SwagmeServer)
=========================
swagme.Add("/socket",async(ctx)=>{
await ctx.StartWebSocketConnectionAsync(async(sendMessage,ping,token)=>{
await sendMessage(WebSocketMessage.Create("Greetings"));
//send messages from here or add sendMessage to List&lt;Func&lt;WebSocketMessage,Task&gt;&gt;
while(!token.IsCancellationRequested)
{
await Task.Delay(100); //you might want to ping here too await ping(new byte[]{42,42,42,42});
}
},async(message)=>{
//message
bool isBinary=message.Binary;
if(isBinary)
{
byte[] data = message.Data;
}else{
string text = message.Text;
//or SomeType data = message.DecodeJson<SomeType>(); for json Data
}
},(clean)=>{
//the socket is closed
//clean means clean exit
});
},,new SwagmeDocumentation("WebSocket endpoint","A cool websocket endpoint"),group: "Real time comms");

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using System;
using Tesses.WebServer;
using System.Threading.Tasks;
using Tesses.WebServer.WebSocket;
using System.Threading;
using System.Text;
using Newtonsoft.Json;
using System.Security.Cryptography;
using System.Collections.Generic;
using System.Linq;
using System.Collections;
using System.IO;
namespace Tesses.WebServer
{
public static class WebSocketExtensions
{
internal static bool FirstEquals<T1,T2>(this Dictionary<T1,List<T2>> dict,T1 t,T2 t2)
{
T2 firstVal;
return dict.TryGetFirst(t,out firstVal) && firstVal.Equals(t2);
}
internal static bool AnyEquals<T1,T2>(this Dictionary<T1,List<T2>> dict,T1 t,T2 t2)
{
List<T2> items;
if(dict.TryGetValue(t,out items))
{
foreach(var item in items)
{
if(item.Equals(t2)) return true;
}
}
return false;
}
public static void StartWebSocketConnection(this ServerContext ctx,Action<Action<WebSocketMessage>,Action<byte[]>,CancellationToken> opened,Action<WebSocketMessage> arrived,Action<bool> closed)
{
var t=ctx.StartWebSocketConnectionAsync(async(s,p,c)=>await Task.Run(()=>opened(
(mm)=>{
Task.Run(async()=>await s(mm)).Wait();
},(data)=>{
Task.Run(async()=>await p(data)).Wait();
},c)),async(m)=>await Task.Run(()=>arrived(m)),closed);
Task.Run(()=>t).Wait();
}
public static async Task StartWebSocketConnectionAsync(this ServerContext ctx,Func<Func<WebSocketMessage,Task>,Func<byte[],Task>,CancellationToken,Task> opened,Func<WebSocketMessage,Task> arrived,Action<bool> closed)
{
WebSocketServer server=new WebSocketServer(ctx);
server.MessageArrived+=async(sender,e)=>{
try{
await arrived(e.Message);
}catch(Exception ex)
{
_=ex;
}
};
server.WebSocketClosed+=(sender,e)=>{
closed(e.Clean);
};
using(var cts=new CancellationTokenSource()){
Thread t=new Thread(async()=>{
try{
await opened(server.SendMessageAsync,server.Ping,cts.Token);
}catch(Exception ex)
{
_=ex;
}
});
t.Start();
await server.StartAsync();
cts.Cancel();
t.Join();
}
}
}
}
namespace Tesses.WebServer.WebSocket
{
public class WebSocketMessage
{
public static WebSocketMessage Create(string text)
{
WebSocketMessage msg=new WebSocketMessage();
msg.Text = text;
return msg;
}
public static WebSocketMessage Create(byte[] data)
{
WebSocketMessage msg=new WebSocketMessage();
msg.Data=data;
return msg;
}
public static WebSocketMessage Create(object data)
{
WebSocketMessage msg=new WebSocketMessage();
msg.EncodeJson(data);
return msg;
}
private WebSocketMessage()
{
Data=new byte[0];
}
internal WebSocketMessage(byte[] message,bool binary)
{
data=message;
Binary=binary;
}
private byte[] data;
public bool Binary {get;private set;}
public byte[] Data {get{return data;} private set{data=value; Binary=true;}}
public T DecodeJson<T>()
{
return JsonConvert.DeserializeObject<T>(Text);
}
private void EncodeJson(object data)
{
Text=JsonConvert.SerializeObject(data);
}
internal IEnumerable<(byte[] array,int)> GetPackets()
{
int read=0;
int offset=0;
byte[] buffer=new byte[4096];
do
{
read = Math.Min(buffer.Length,data.Length-offset);
Array.Copy(data,offset,buffer,0,read);
yield return (buffer,read);
offset+=read;
}while(read>0);
}
public string Text {get{return Encoding.UTF8.GetString(Data);} private set{data=Encoding.UTF8.GetBytes(value); Binary=false;}}
}
public class WebSocketMessageEventArgs : EventArgs
{
public WebSocketMessageEventArgs(WebSocketMessage message)
{
Message=message;
}
public WebSocketMessage Message {get;private set;}
}
public class WebSocketClosedEventArgs : EventArgs
{
public WebSocketClosedEventArgs(bool clean)
{
Clean=clean;
}
public bool Clean {get;private set;}
}
public class WebSocketServer
{
bool hasInit=false;
ServerContext context;
public WebSocketServer(ServerContext ctx)
{
context=ctx;
}
public EventHandler<WebSocketMessageEventArgs> MessageArrived;
public EventHandler<WebSocketClosedEventArgs> WebSocketClosed;
private byte[] glenBytes(long len)
{
if(len < 126)
{
return new byte[]{(byte)len};
}else if(len <= ushort.MaxValue)
{
byte[] num = BitConverter.GetBytes((ushort)len);
if(BitConverter.IsLittleEndian)
{
Array.Reverse(num);
}
return new byte[]{126,num[0],num[1]};
}else{
byte[] num = BitConverter.GetBytes(len);
if(BitConverter.IsLittleEndian)
{
Array.Reverse(num);
}
return new byte[]{127,num[0],num[1],num[2],num[3],num[4],num[5],num[6],num[7]};
}
}
public async Task SendMessageAsync(WebSocketMessage msg)
{
while(!hasInit) ;
int opCode = msg.Binary ? 0x2 : 0x1;
(byte[] buff,int len)[] parts = msg.GetPackets().ToArray();
for(int i = 0;i<parts.Length;i++)
{
bool fin = i == parts.Length-1;
int finField = fin ? 0b10000000 : 0;
int opCode2 = i==0 ? opCode : 0;
byte firstByte= (byte)(finField | (opCode2 & 0xF));
var b=glenBytes(parts[i].len);
byte[] message = new byte[1+b.Length + parts[i].len];
message[0]=firstByte;
Array.Copy(b,0,message,1,b.Length);
Array.Copy(parts[i].buff,0,message,1+b.Length,parts[i].len);
await context.NetworkStream.WriteAsync(message,0,message.Length);
}
}
private async Task PongSend(byte[] msg,long len)
{
int finField = 0b10000000 ;
byte firstByte= (byte)(finField | 0xA);
var b=glenBytes(len);
byte[] message = new byte[1+b.Length + len];
message[0]=firstByte;
Array.Copy(b,0,message,1,b.Length);
Array.Copy(msg,0,message,1+b.Length,len);
await context.NetworkStream.WriteAsync(message,0,message.Length);
}
private string get_Sec_WebSocketAccept(string headerVal)
{
if(string.IsNullOrWhiteSpace(headerVal))
{
return "";
}
string headerVal2 = $"{headerVal.Trim()}258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
var res=SHA1.Create().ComputeHash(Encoding.UTF8.GetBytes(headerVal2));
return Convert.ToBase64String(res);
}
private void MaskMessage(byte[] key,byte[] message)
{
if(key.Length < 4)
{
return;
}
for(int i = 0;i<message.Length;i++)
{
message[i] ^= key[i % 4];
}
}
private async Task<long> get_long()
{
byte[] data = new byte[8];
await context.NetworkStream.ReadAsync(data,0,data.Length);
if(BitConverter.IsLittleEndian)
{
Array.Reverse(data);
}
return BitConverter.ToInt64(data,0);
}
public async Task Ping(byte[] ping)
{
int finField = 0b10000000 ;
byte firstByte= (byte)(finField | 0x9);
var b=glenBytes(ping.Length);
byte[] message = new byte[1+b.Length + ping.Length];
message[0]=firstByte;
Array.Copy(b,0,message,1,b.Length);
Array.Copy(ping,0,message,1+b.Length,ping.Length);
await context.NetworkStream.WriteAsync(message,0,message.Length);
}
private async Task<short> get_short()
{
byte[] data = new byte[2];
await context.NetworkStream.ReadAsync(data,0,data.Length);
if(BitConverter.IsLittleEndian)
{
Array.Reverse(data);
}
return BitConverter.ToInt16(data,0);
}
private async Task<(byte[] data,long len)> read_packet_async(byte len)
{
int realLen=len & 127;
bool masked=(len & 0b10000000) > 0;
long realLen2 = realLen >= 126 ? realLen > 126 ? await get_long() : await get_short() : realLen;
byte[] maskingKey = new byte[4];
if(masked)
{
await context.NetworkStream.ReadAsync(maskingKey,0,maskingKey.Length);
}
byte[] data = new byte[realLen2];
await context.NetworkStream.ReadAsync(data,0,data.Length);
if(masked)
{
MaskMessage(maskingKey,data);
}
return (data,realLen2);
}
public async Task StartAsync()
{
/*
GET /chatUrl HTTP/1.1
Host: server.example.com
Upgrade: websocket
*/
string sec_websocket_accept="";
if(context.RequestHeaders.TryGetFirst("Sec-WebSocket-Key",out sec_websocket_accept))
{
sec_websocket_accept=get_Sec_WebSocketAccept(sec_websocket_accept);
}else{
return;
}
if(!context.RequestHeaders.AnyEquals("Upgrade","websocket"))
{
//Console.WriteLine("Doesn't contain Upgrade: websocket");
return;
}
if(!context.RequestHeaders.AnyEquals("Sec-WebSocket-Version", "13"))
{
//Console.WriteLine("Doesn't contain version 13");
return;
}
context.StatusCode = 101;
context.ResponseHeaders.Add("Upgrade","websocket");
if(context.ResponseHeaders.ContainsKey("Connection"))
{
context.ResponseHeaders["Connection"].Clear();
}
context.ResponseHeaders.Add("Connection","Upgrade");
context.ResponseHeaders.Add("Sec-WebSocket-Accept",sec_websocket_accept);
await context.WriteHeadersAsync();
//await context.NetworkStream.FlushAsync();
await context.NetworkStream.FlushAsync();
hasInit=true;
bool isBinary=false;
MemoryStream strm=new MemoryStream();
while(context.Connected)
{
byte[] frame_start=new byte[2];
await context.NetworkStream.ReadAsync(frame_start,0,2);
byte first= frame_start[0];
bool hasMessage =false;
int opcode = first & 0xF;
bool fin = (first | 0b10000000) > 0;
switch(opcode)
{
case 0x0:
if(!hasMessage) break;
var (data,len)= await read_packet_async(frame_start[1]);
strm.Write(data,0,(int)len);
break;
case 0x1:
case 0x2:
hasMessage=true;
strm.Dispose();
strm=new MemoryStream();
isBinary = opcode == 0x2;
var (data2,len2)= await read_packet_async(frame_start[1]);
strm.Write(data2,0,(int)len2);
break;
case 0x8:
WebSocketClosed?.Invoke(this,new WebSocketClosedEventArgs(true));
return;
case 0x9:
var (data3,len3) =await read_packet_async(frame_start[1]);
await PongSend(data3,len3);
break;
case 0xA:
var (data4,len4) =await read_packet_async(frame_start[1]);
break;
}
if(fin && hasMessage)
{
hasMessage=false;
WebSocketMessage msg=new WebSocketMessage(strm.ToArray(),isBinary);
MessageArrived?.Invoke(this,new WebSocketMessageEventArgs(msg));
}
}
WebSocketClosed?.Invoke(this,new WebSocketClosedEventArgs(false));
}
}
}

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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netstandard2.0</TargetFramework>
<PackageId>Tesses.WebServer.WebSocket</PackageId>
<Author>Mike Nolan</Author>
<Company>Tesses</Company>
<Version>1.0.0</Version>
<AssemblyVersion>1.0.0</AssemblyVersion>
<FileVersion>1.0.0</FileVersion>
<Description>WebSockets for Tesses.WebServer</Description>
<PackageLicenseExpression>MIT</PackageLicenseExpression>
<PackageTags>HTTP, WebServer, Website, WebSockets</PackageTags>
<RepositoryUrl>https://gitlab.tesses.net/tesses50/tesses.webserver.websocket</RepositoryUrl>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Tesses.WebServer" Version="1.0.3.8" />
</ItemGroup>
</Project>

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using Tesses.WebServer;
using Tesses.WebServer.WebSocket;
List<Func<WebSocketMessage,Task>> sendTo=new List<Func<WebSocketMessage, Task>>();
MountableServer svr=new MountableServer(new StaticServer("www"));
RouteServer rsvr=new RouteServer();
svr.Mount("/api/",rsvr);
rsvr.Add("/socket",async(ctx)=>{
Func<WebSocketMessage,Task>? f=null;
await ctx.StartWebSocketConnectionAsync(async(sendMessage,ping,token)=>{
f=sendMessage;
await sendMessage(WebSocketMessage.Create("Hello"));
lock(sendTo){
sendTo.Add(sendMessage);
}
while(!token.IsCancellationRequested)
{
await Task.Delay(100);
}
},async(message)=>{
List<Func<WebSocketMessage,Task>> sendTo2=new List<Func<WebSocketMessage,Task>>();
lock(sendTo)
{
sendTo2.AddRange(sendTo);
}
Console.WriteLine($"Message: {message.Text}");
foreach(var item in sendTo2)
{
await item(message);
}
},(clean)=>{
lock(sendTo){
if(f!= null)
sendTo.Remove(f);
}
});
});
svr.StartServer(4449);

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<Project Sdk="Microsoft.NET.Sdk">
<ItemGroup>
<ProjectReference Include="..\Tesses.WebServer.WebSocket\Tesses.WebServer.WebSocket.csproj" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="Tesses.WebServer.EasyServer" Version="1.0.1" />
</ItemGroup>
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net6.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>

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@ -0,0 +1,30 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>WebSocket test</title>
</head>
<body>
<input type="text" name="field" id="field">
<button onclick="send()">Send</button>
<div id="msg">
</div>
<script>
function send()
{
const txt = document.getElementById('field');
ws.send(txt.value);
txt.value="";
}
const ws = new WebSocket(`ws://${window.location.host}/api/socket`);
ws.addEventListener('message', (event) => {
const data = document.getElementById('msg');
data.innerText += event.data + '\n';
});
</script>
</body>
</html>