Split Common from Messages

src/Web/Common/Shared.cs

@@ -0,0 +1,42 @@
+using System.Security.Claims;
+
+namespace Hutopy.Web.Common;
+
+public class Shared(string claimName) : Exception;
+
+public static class ClaimsPrincipalExtensions
+{
+    public static Guid GetUserId(this ClaimsPrincipal claims)
+    {
+        return (Guid)claims.GetFirstValue<Guid>(ClaimTypes.NameIdentifier);
+    }
+
+    public static string GetFirstName(this ClaimsPrincipal claims)
+    {
+        return (string)claims.GetFirstValue<string>(ClaimTypes.GivenName);
+    }
+
+    public static string GetLastName(this ClaimsPrincipal claims)
+    {
+        return (string)claims.GetFirstValue<string>(ClaimTypes.Surname);
+    }
+
+    public static string GetEmail(this ClaimsPrincipal claims)
+    {
+        return (string)claims.GetFirstValue<string>(ClaimTypes.Email);
+    }
+
+    public static object GetFirstValue<TValue>(this ClaimsPrincipal claims, string key)
+    {
+        var claim = claims.FindFirst(key);
+
+        if (claim is null) throw new Shared(key);
+
+        if (typeof(TValue) == typeof(Guid))
+        {
+            return Guid.Parse(claim.Value);
+        }
+
+        return Convert.ChangeType(claim.Value, typeof(TValue));
+    }
+}