massive checkpoint

Gameboard.ShogiUI.Sockets/Managers/SocketTokenCache.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Gameboard.ShogiUI.Sockets.Managers
+{
+  public interface ISocketTokenCache
+  {
+    Guid GenerateToken(string s);
+    string? GetUsername(Guid g);
+  }
+
+  public class SocketTokenCache : ISocketTokenCache
+  {
+    /// <summary>
+    /// Key is userName or webSessionId
+    /// </summary>
+    private readonly ConcurrentDictionary<string, Guid> Tokens;
+
+    public SocketTokenCache()
+    {
+      Tokens = new ConcurrentDictionary<string, Guid>();
+    }
+
+    public Guid GenerateToken(string userName)
+    {
+      Tokens.Remove(userName, out _);
+
+      var guid = Guid.NewGuid();
+      Tokens.TryAdd(userName, guid);
+
+      _ = Task.Run(async () =>
+      {
+        await Task.Delay(TimeSpan.FromMinutes(1));
+        Tokens.Remove(userName, out _);
+      });
+
+      return guid;
+    }
+
+    /// <returns>User name associated to the guid or null.</returns>
+    public string? GetUsername(Guid guid)
+    {
+      var userName = Tokens.FirstOrDefault(kvp => kvp.Value == guid).Key;
+      if (userName != null)
+      {
+        Tokens.Remove(userName, out _);
+      }
+      return userName;
+    }
+  }
+}