DigitalData.Core/DigitalData.Core.Abstractions/Security/SecurityExtensions.cs

namespace DigitalData.Core.Abstractions.Security
{
    public static class SecurityExtensions
    {
        public static IEnumerable<TUniqueSecurityContext> GetByIssuer<TUniqueSecurityContext>(this IEnumerable<TUniqueSecurityContext> contextes, string issuer) where TUniqueSecurityContext: IUniqueSecurityContext
            => contextes.Where(c => c.Issuer == issuer);

        public static IEnumerable<TUniqueSecurityContext> GetByAudience<TUniqueSecurityContext>(this IEnumerable<TUniqueSecurityContext> contextes, string audience) where TUniqueSecurityContext : IUniqueSecurityContext
            => contextes.Where(c => c.Audience == audience);

        public static TUniqueSecurityContext Get<TUniqueSecurityContext>(this IEnumerable<TUniqueSecurityContext> contextes, string issuer, string audience) where TUniqueSecurityContext : IUniqueSecurityContext
            => contextes.Where(c => c.Issuer == issuer && c.Audience == audience).SingleOrDefault()
            ?? throw new InvalidOperationException($"Exactly one {typeof(TUniqueSecurityContext).Name} must exist with Issuer: '{issuer}' and Audience: '{audience}'.");

        public static bool TryGet<TUniqueSecurityContext>(this IEnumerable<TUniqueSecurityContext> contextes, string issuer, string audience, out TUniqueSecurityContext? context) where TUniqueSecurityContext : IUniqueSecurityContext
        {
            context = contextes.SingleOrDefault(c => c.Issuer == issuer && c.Audience == audience);
            return context is not null;
        }
    }
}