feat(AsymCryptParams): DateTagFormat als Subtext des Dateinamens für die periodische Aktualisierung von pem-Dateien hinzugefügt.

DigitalData.Core.Security/Config/AsymCryptParams.cs

@@ -36,13 +36,28 @@ namespace DigitalData.Core.Security.Config
         /// </example>
         public string KeyNameSeparator { get; init; } = ":";
 
+        /// <summary>
+        ///This is the subtext of the pem file name. For the file to be automatically renewed, the name must be assigned to change periodically. For example, by default MM/2 will be refreshed every 2 months.
+        /// <br />
+        /// - <see cref="StringExtensions.ToTag(DateTime, string)" /> is used when converting to tag.
+        /// <br />
+        /// - If the format contains the "//" symbol, the method divides the numeric value derived from the left side of the format 
+        /// by the numeric value of the right side of the format string. For instance:
+        /// <br />
+        /// - If the date is 02.03.2024 and the format is "MM//2", it extracts the month (02), divides it by 2 (resulting in 1),
+        ///   and returns "1".
+        ///   <br />
+        /// - If the format does not contain "//", the method uses the default <see cref="DateTime.ToString"/> format.
+        /// <br />
+        /// This method provides a way to format the date based on typical or customized rules, including mathematical operations like division.
+        /// </summary>
+        public string DateTagFormat { get; init; } = "MM//2";
+
         public IEnumerable<RSADecryptor> Decryptors { get; init; } = new List<RSADecryptor>();
 
         public RSADecryptor? Vault { get; init; }
 
-        public AsymCryptParams()
-        {
-            AfterCreate += () =>
+        public AsymCryptParams() => AfterCreate += () =>
             {
                 // Create root folder if it does not exist
                 if (!Directory.Exists(PemDirectory))
@@ -53,7 +68,7 @@ namespace DigitalData.Core.Security.Config
                     // set default path
                     if (decryptor.IsPemNull)
                     {
-                        var file_name_params = new List<object> { decryptor.Issuer, decryptor.Audience, KeySizeInBits };
+                        var file_name_params = new List<object> { decryptor.Issuer, decryptor.Audience, KeySizeInBits, DateTime.Now.ToTag(DateTagFormat) };
                         if (decryptor.IsEncrypted)
                             file_name_params.Add(Secrets.Version);
 
@@ -77,6 +92,5 @@ namespace DigitalData.Core.Security.Config
                     }
                 }
             };
-        }
     }
 }