All the code

Gameboard.ShogiUI.Sockets/Managers/SocketTokenManager.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Websockets.Managers
+{
+  public interface ISocketTokenManager
+  {
+    Guid GenerateToken(string s);
+    string GetUsername(Guid g);
+  }
+
+  public class SocketTokenManager : ISocketTokenManager
+  {
+    /// <summary>
+    /// Key is userName
+    /// </summary>
+    private readonly Dictionary<string, Guid> Tokens;
+
+    public SocketTokenManager()
+    {
+      Tokens = new Dictionary<string, Guid>();
+    }
+
+    public Guid GenerateToken(string userName)
+    {
+      var guid = Guid.NewGuid();
+
+      if (Tokens.ContainsKey(userName))
+      {
+        Tokens.Remove(userName);
+      }
+      Tokens.Add(userName, guid);
+
+      _ = Task.Run(async () =>
+      {
+        await Task.Delay(TimeSpan.FromMinutes(1));
+        Tokens.Remove(userName);
+      });
+
+      return guid;
+    }
+
+    /// <returns>User name associated to the guid or null.</returns>
+    public string GetUsername(Guid guid)
+    {
+      if (Tokens.ContainsValue(guid))
+      {
+        var username = Tokens.First(kvp => kvp.Value == guid).Key;
+        Tokens.Remove(username);
+        return username;
+      }
+      return null;
+    }
+  }
+}