Refactor DocumentCreateCommand and enhance validation

Updated the `DocumentCreateCommand` record to include a nullable `DataAsBase64` property for better encapsulation. Enhanced the `EnvelopeReceiverController` with logic to validate document data, ensuring that either `DataAsBase64` or `DataAsByte` is provided, but not both. Introduced a new static method `IsBase64String` to validate base64 string format.

EnvelopeGenerator.Application/EnvelopeReceivers/Commands/Create/CreateEnvelopeReceiverDtos.cs

@@ -39,8 +39,11 @@ public record ReceiverGetOrCreateCommand([Required] IEnumerable<Signature> Signa
 /// <param name="DataAsByte">
 /// Die Dokumentdaten im Byte-Array-Format. Wird verwendet, wenn das Dokument als Roh-Binärdaten bereitgestellt wird.
 /// </param>
-/// <param name="DataAsBase64">
+public record DocumentCreateCommand(byte[]? DataAsByte = null)
+{
+    /// <summary>
     /// Die Dokumentdaten im Base64-String-Format. Wird verwendet, wenn das Dokument als Base64-codierter String bereitgestellt wird.
-/// </param>
-public record DocumentCreateCommand(byte[]? DataAsByte = null, string? DataAsBase64 = null);
+    /// </summary>
+    public string? DataAsBase64 { get; set; }
+};
 #endregion

EnvelopeGenerator.GeneratorAPI/Controllers/EnvelopeReceiverController.cs

@@ -37,6 +37,8 @@ public class EnvelopeReceiverController : ControllerBase
 
     private readonly IEnvelopeReceiverExecutor _erExecutor;
 
+    private readonly IDocumentExecutor _documentExecutor;
+
     /// <summary>
     /// Konstruktor für den EnvelopeReceiverController.
     /// </summary>
@@ -46,7 +48,7 @@ public class EnvelopeReceiverController : ControllerBase
     /// <param name="mapper"></param>
     /// <param name="envelopeExecutor"></param>
     /// <param name="erExecutor"></param>
-    public EnvelopeReceiverController(ILogger<EnvelopeReceiverController> logger, IEnvelopeReceiverService envelopeReceiverService, IMediator mediator, IMapper mapper, IEnvelopeExecutor envelopeExecutor, IEnvelopeReceiverExecutor erExecutor)
+    public EnvelopeReceiverController(ILogger<EnvelopeReceiverController> logger, IEnvelopeReceiverService envelopeReceiverService, IMediator mediator, IMapper mapper, IEnvelopeExecutor envelopeExecutor, IEnvelopeReceiverExecutor erExecutor, IDocumentExecutor documentExecutor)
     {
         _logger = logger;
         _erService = envelopeReceiverService;
@@ -54,6 +56,7 @@ public class EnvelopeReceiverController : ControllerBase
         _mapper = mapper;
         _envelopeExecutor = envelopeExecutor;
         _erExecutor = erExecutor;
+        _documentExecutor = documentExecutor;
     }
 
     /// <summary>
@@ -211,6 +214,20 @@ public class EnvelopeReceiverController : ControllerBase
             #endregion
 
             #region Add document
+            if(request.Document.DataAsBase64 is null)
+                if (request.Document.DataAsByte is null)
+                    return BadRequest("No document data is found");
+                else
+                    request.Document.DataAsBase64 = Convert.ToBase64String(request.Document.DataAsByte);
+            else if (request.Document.DataAsByte is not null)
+                return BadRequest("Document data cannot be assigned as both byte data and base64 string.");
+            else if (!IsBase64String(request.Document.DataAsBase64))
+                return BadRequest("Document data is not a base64 string");
+
+            var document = await _documentExecutor.CreateDocumentAsync(request.Document.DataAsBase64, envelope.Uuid, cancel);
+
+            if(document is null)
+                return StatusCode(StatusCodes.Status500InternalServerError, "Document creation is failed.");
 
             #endregion
 
@@ -222,4 +239,26 @@ public class EnvelopeReceiverController : ControllerBase
             return StatusCode(StatusCodes.Status500InternalServerError);
         }
     }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="input"></param>
+    /// <returns></returns>
+    public static bool IsBase64String(string input)
+    {
+        if (string.IsNullOrWhiteSpace(input))
+            return false;
+
+        try
+        {
+            Convert.FromBase64String(input);
+            return true;
+        }
+        catch (FormatException)
+        {
+            return false;
+        }
+    }
+
 }