finally

WebSocketsChatApi/Controllers/WebSocketChatController.cs

@@ -1,12 +1,37 @@
+using System.Net.WebSockets;
 using Microsoft.AspNetCore.Mvc;
 
 namespace WebSocketsChatApi.Controllers;
 [ApiController]
 public class WebSocketChatController: ControllerBase
 {
+    private static List<WebSocket> _webSockets = new();
     [Route("/chat")]
     public async Task Chat()
     {
-        
+        if (HttpContext.WebSockets.IsWebSocketRequest)
+        {
+            using var webSocket = await HttpContext.WebSockets.AcceptWebSocketAsync();
+            _webSockets.Add(webSocket);
+            await ResendMessages(webSocket);
+        }
+        else
+        {
+            HttpContext.Response.StatusCode = StatusCodes.Status400BadRequest;
+        }
+    }
+
+    public async Task ResendMessages(WebSocket senderWebSocket)
+    {
+        while (senderWebSocket.State == WebSocketState.Open)
+        {
+            ArraySegment<Byte> buffer = new ArraySegment<byte>(new Byte[1024 * 4]);
+            var result = await senderWebSocket.ReceiveAsync(buffer, CancellationToken.None);
+            foreach (var websocket in _webSockets)
+            {
+                if(senderWebSocket == websocket) continue;
+               await websocket.SendAsync(buffer.Array, WebSocketMessageType.Text, true, CancellationToken.None);
+            }
+        }
     }
 }