create, read, playercount

Shogi.Api/Extensions/ClaimsExtensions.cs

@@ -0,0 +1,42 @@
+using System.Security.Claims;
+
+namespace Shogi.Api.Extensions;
+
+public static class ClaimsExtensions
+{
+	private static readonly string MsalUsernameClaim = "preferred_username";
+
+	public static string? GetGuestUserId(this ClaimsPrincipal self)
+	{
+		return self.Claims.FirstOrDefault(c => c.Type == ClaimTypes.NameIdentifier)?.Value;
+	}
+
+	public static string? DisplayName(this ClaimsPrincipal self)
+	{
+		return self.Claims.FirstOrDefault(c => c.Type == ClaimTypes.Name)?.Value;
+	}
+
+	public static bool IsMicrosoft(this ClaimsPrincipal self)
+	{
+		return self.HasClaim(c => c.Type == MsalUsernameClaim);
+	}
+
+	public static string? GetMicrosoftUserId(this ClaimsPrincipal self)
+	{
+		return self.Claims.FirstOrDefault(c => c.Type == MsalUsernameClaim)?.Value;
+	}
+
+	/// <summary>
+	/// Reads the userId from claims after claims transformation has occurred.
+	/// Throws if a shogi userid is not found.
+	/// </summary>
+	/// <exception cref="InvalidOperationException"></exception>
+	public static string GetShogiUserId(this ClaimsPrincipal self)
+	{
+		var id = self.IsMicrosoft() ? self.GetMicrosoftUserId() : self.GetGuestUserId();
+		
+		if (string.IsNullOrEmpty(id)) throw new InvalidOperationException("Shogi UserId not found in claims.");
+
+		return id;
+	}
+}