yep

Gameboard.ShogiUI.Sockets/Extensions/Extensions.cs

@@ -1,28 +1,29 @@
-using System.Linq;
-using System.Security.Claims;
+using System.Security.Claims;
 
 namespace Gameboard.ShogiUI.Sockets.Extensions
 {
-  public static class Extensions
-  {
-    public static string? UserId(this ClaimsPrincipal self)
-    {
-      return self.Claims.FirstOrDefault(c => c.Type == ClaimTypes.NameIdentifier)?.Value;
-    }
+	public static class Extensions
+	{
+		private static readonly string MsalUsernameClaim = "preferred_username";
 
-    public static string? DisplayName(this ClaimsPrincipal self)
-    {
-      return self.Claims.FirstOrDefault(c => c.Type == ClaimTypes.Name)?.Value;
-    }
+		public static string? UserId(this ClaimsPrincipal self)
+		{
+			return self.Claims.FirstOrDefault(c => c.Type == ClaimTypes.NameIdentifier)?.Value;
+		}
 
-    public static bool IsGuest(this ClaimsPrincipal self)
-    {
-      return self.HasClaim(c => c.Type == ClaimTypes.Role && c.Value == "Guest");
-    }
+		public static string? DisplayName(this ClaimsPrincipal self)
+		{
+			return self.Claims.FirstOrDefault(c => c.Type == ClaimTypes.Name)?.Value;
+		}
 
-    public static string ToCamelCase(this string self)
-    {
-      return char.ToLowerInvariant(self[0]) + self[1..];
-    }
-  }
+		public static bool IsMicrosoft(this ClaimsPrincipal self)
+		{
+			return self.HasClaim(c => c.Type == MsalUsernameClaim);
+		}
+
+		public static string ChangeFirstCharacterToLowerCase(this string self)
+		{
+			return char.ToLowerInvariant(self[0]) + self[1..];
+		}
+	}
 }