refactor: Receiver-Service in CRUD-Service umgewandelt und DTOs aktualisiert

- Receiver-Service von einfachem CRUD zu generischem CRUD-Service umgewandelt.
- `ReceiverDto` in `ReceiverReadDto` umbenannt.
- Neues `ReceiverCreateDto` mit automatischer SHA-256-Signaturerstellung und aktuellem Zeitstempel erstellt.
- Leeres `ReceiverUpdateDto` für zukünftige Updates hinzugefügt.

EnvelopeGenerator.Application/DTOs/EnvelopeHistory/EnvelopeHistoryDto.cs

@@ -1,5 +1,6 @@
 using DigitalData.Core.DTO;
 using DigitalData.UserManager.Application.DTOs.User;
+using EnvelopeGenerator.Application.DTOs.Receiver;
 using static EnvelopeGenerator.Common.Constants;
 
 namespace EnvelopeGenerator.Application.DTOs.EnvelopeHistory
@@ -12,7 +13,7 @@ namespace EnvelopeGenerator.Application.DTOs.EnvelopeHistory
         DateTime AddedWhen,
         DateTime? ActionDate,
         UserCreateDto? Sender,
-        ReceiverDto? Receiver,
+        ReceiverReadDto? Receiver,
         ReferenceType ReferenceType,
         string? Comment = null) : BaseDTO<long>(Id);
 }

EnvelopeGenerator.Application/DTOs/EnvelopeReceiverDto.cs

@@ -1,4 +1,5 @@
 using DigitalData.EmailProfilerDispatcher.Abstraction.Attributes;
+using EnvelopeGenerator.Application.DTOs.Receiver;
 
 namespace EnvelopeGenerator.Application.DTOs
 {
@@ -25,6 +26,6 @@ namespace EnvelopeGenerator.Application.DTOs
 				
 		public EnvelopeDto? Envelope { get; set; }
 
-		public ReceiverDto? Receiver { get; set; }
+		public ReceiverReadDto? Receiver { get; set; }
 	}
 }

EnvelopeGenerator.Application/DTOs/Receiver/ReceiverCreateDto.cs

@@ -0,0 +1,20 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace EnvelopeGenerator.Application.DTOs.Receiver
+{
+    public record ReceiverCreateDto(string EmailAddress)
+    {
+        public string Signature => sha256HexOfMail.Value;
+
+        private readonly Lazy<string> sha256HexOfMail = new(() =>
+        {
+            var bytes_arr = Encoding.UTF8.GetBytes(EmailAddress.ToUpper());
+            var hash_arr = SHA256.HashData(bytes_arr);
+            var hexa_str = BitConverter.ToString(hash_arr);
+            return hexa_str.Replace("-", string.Empty);
+        });
+
+        public DateTime AddedWhen { get; } = DateTime.Now;
+    };
+}

EnvelopeGenerator.Application/DTOs/Receiver/ReceiverReadDto.cs

@@ -1,8 +1,8 @@
 using DigitalData.Core.DTO;
 
-namespace EnvelopeGenerator.Application.DTOs
+namespace EnvelopeGenerator.Application.DTOs.Receiver
 {
-    public record ReceiverDto(
+    public record ReceiverReadDto(
         int Id,
         string EmailAddress,
         string Signature,

EnvelopeGenerator.Application/DTOs/Receiver/ReceiverUpdateDto.cs

@@ -0,0 +1,4 @@
+namespace EnvelopeGenerator.Application.DTOs.Receiver
+{
+    public record ReceiverUpdateDto();
+}