feat(CryptographerExtensions): Erstellt Erweiterungen zum Suchen und Erstellen von RSACryptographerList.

DigitalData.Core.Security/Cryptographer/CryptographerExtensions.cs

@@ -0,0 +1,29 @@
+namespace DigitalData.Core.Security.Cryptographer
+{
+    public static class CryptographerExtensions
+    {
+        public static IEnumerable<TRSACryptographer> GetByIssuer<TRSACryptographer>(this IEnumerable<TRSACryptographer> cryptographers, string issuer) where TRSACryptographer: RSACryptographer
+            => cryptographers.Where(c => c.Issuer == issuer);
+
+        public static IEnumerable<TRSACryptographer> GetByAudience<TRSACryptographer>(this IEnumerable<TRSACryptographer> cryptographers, string audience) where TRSACryptographer : RSACryptographer
+            => cryptographers.Where(c => c.Audience == audience);
+
+        public static TRSACryptographer Get<TRSACryptographer>(this IEnumerable<TRSACryptographer> cryptographers, string issuer, string audience) where TRSACryptographer : RSACryptographer
+            => cryptographers.Where(c => c.Issuer == issuer && c.Audience == audience).SingleOrDefault()
+            ?? throw new InvalidOperationException($"No {cryptographers.GetTypeName()} found with Issuer: {issuer} and Audience: {audience}");
+
+        public static bool TryGet<TRSACryptographer>(this IEnumerable<TRSACryptographer> cryptographers, string issuer, string audience, out TRSACryptographer? cryptographer) where TRSACryptographer : RSACryptographer
+        {
+            cryptographer = cryptographers.Where(c => c.Issuer == issuer && c.Audience == audience).SingleOrDefault();
+            return cryptographer is not null;
+        }
+
+        public static RSACryptographerList<TRSACryptographer> ToCryptographerList<TRSACryptographer>(this IEnumerable<TRSACryptographer> cryptographers, Func<TRSACryptographer, string> keyGenerator) where TRSACryptographer : RSACryptographer
+            => new(keyGenerator: keyGenerator, cryptographers: cryptographers);
+
+        private static string GetTypeName<TRSACryptographer>(this IEnumerable<TRSACryptographer> cryptographers) where TRSACryptographer : RSACryptographer
+            => typeof(TRSACryptographer).GetType().Name.TrimStart(InterfaceIdentifierChar);
+
+        private static readonly char InterfaceIdentifierChar = 'I';
+    }
+}