social-media/src/Web/Common/ClaimsPrincipalExtensions.cs

using System.Security.Claims;

namespace Hutopy.Web.Common;

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 MissingClaimException(key);

        if (typeof(TValue) == typeof(Guid))
        {
            return Guid.Parse(claim.Value);
        }

        return Convert.ChangeType(claim.Value, typeof(TValue));
    }
}