Reapply "refactor(RSACryptographer): Entfernte nullbare Eigenschaft von Issuer und Audience."

This reverts commit 600d17ef40a1ed5092ba3bde0c22c03f825ae1fb.

DigitalData.Core.Abstractions/Security/IRSACryptographer.cs

@@ -8,8 +8,8 @@ namespace DigitalData.Core.Abstractions.Security
 
         public RSAEncryptionPadding Padding { get; init; }
 
-        public string? Issuer { get; init; }
+        public string Issuer { get; init; }
 
-        public string? Audience { get; init; }
+        public string Audience { get; init; }
     }
 }

DigitalData.Core.Security/Cryptographer/RSACryptographer.cs

@@ -1,20 +1,58 @@
 using DigitalData.Core.Abstractions.Security;
 using System.Security.Cryptography;
+using System.Text.Json.Serialization;
 
 namespace DigitalData.Core.Security.Cryptographer
 {
-    public class RSACryptographer : IRSACryptographer
+    public class RSACryptographer : IRSACryptographer, IJsonOnDeserialized
     {
-        public required virtual string Pem { get; init; }
+        private string? _pem;
+
+        private string? _pemPath;
+
+        public virtual string Pem
+        {
+            get => _pem!;
+            init
+            {
+                ValidatePemInit();
+                _pem = value;
+            }
+        }
+
+        public string? PemPath
+        {
+            get => _pemPath;
+            init
+            {
+                _pemPath = value;
+                if (value is null)
+                    return;
+                ValidatePemInit();
+                _pem = File.ReadAllText(value);
+            }
+        }
 
         public RSAEncryptionPadding Padding { get; init; } = RSAEncryptionPadding.OaepSHA256;
 
         protected virtual RSA RSA { get; } = RSA.Create();
 
-        public string? Issuer { get; init; }
+        public string Issuer { get; init; } = string.Empty;
 
-        public string? Audience { get; init; }
+        public string Audience { get; init; } = string.Empty;
 
         internal RSACryptographer() { }
+
+        public void OnDeserialized()
+        {
+            if (Pem is null)
+                throw new InvalidOperationException($"Pem must be initialized. Issuer: {Issuer} and Audience: {Audience}");
+        }
+
+        private void ValidatePemInit()
+        {
+            if (_pem is not null)
+                throw new InvalidOperationException($"Pem can only be initilized once. Remove one of the Pem or Pem file initilizations. Issuer: {Issuer} and Audience: {Audience}");
+        }
     }
 }

DigitalData.Core.Security/Cryptographer/RSAEncryptor.cs

@@ -5,7 +5,7 @@ namespace DigitalData.Core.Security.Cryptographer
 {
     public class RSAEncryptor : RSACryptographer, IRSAEncryptor, IRSACryptographer
     {
-        public override required string Pem
+        public override string Pem
         {
             get => base.Pem;
             init
@@ -14,7 +14,7 @@ namespace DigitalData.Core.Security.Cryptographer
                 base.Pem = value;
             }
         }
-
+        
         public byte[] Encrypt(byte[] data) => RSA.Encrypt(data, Padding);
 
         public string Encrypt(string data) => RSA.Encrypt(data.Base64ToByte(), Padding).BytesToString();