massive checkpoint

Gameboard.ShogiUI.Sockets/ShogiUserClaimsTransformer.cs

@@ -0,0 +1,46 @@
+using Gameboard.ShogiUI.Sockets.Repositories;
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.AspNetCore.Authentication.JwtBearer;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Claims;
+using System.Threading.Tasks;
+
+namespace Gameboard.ShogiUI.Sockets
+{
+  /// <summary>
+  /// Standardizes the claims from third party issuers. Also registers new msal users in the database.
+  /// </summary>
+  public class ShogiUserClaimsTransformer : IClaimsTransformation
+  {
+    private static readonly string MsalUsernameClaim = "preferred_username";
+    private readonly IGameboardRepository gameboardRepository;
+
+    public ShogiUserClaimsTransformer(IGameboardRepository gameboardRepository)
+    {
+      this.gameboardRepository = gameboardRepository;
+    }
+
+    public async Task<ClaimsPrincipal> TransformAsync(ClaimsPrincipal principal)
+    {
+      var nameClaim = principal.Claims.FirstOrDefault(c => c.Type == MsalUsernameClaim);
+      if (nameClaim != default)
+      {
+        var user = await gameboardRepository.ReadUser(nameClaim.Value);
+        if (user == null)
+        {
+          var newUser = new Models.User(nameClaim.Value);
+          var success = await gameboardRepository.CreateUser(newUser);
+          if (success) user = newUser;
+        }
+
+        if (user != null)
+        {
+          return new ClaimsPrincipal(user.CreateMsalUserIdentity());
+        }
+      }
+      return principal;
+    }
+  }
+}