refactor: convert BurnPdfCommand to record and update handler to return byte[]

- Changed `BurnPdfCommand` from empty class to a `record` with properties: `SourceBuffer`, `InstantJSONList`, `EnvelopeId`.
- Updated `BurnPdfCommandHandler` to implement `IRequestHandler<BurnPdfCommand, byte[]>`.
- Modified `Handle` method to be async and use the `request` data to return PDF bytes.
- Removed obsolete `BurnPdfCommand` class and updated related logic accordingly.

EnvelopeGenerator.Application/Pdf/BurnPdfCommand.cs

@@ -17,14 +17,12 @@ namespace EnvelopeGenerator.Application.Pdf;
 /// <summary>
 /// 
 /// </summary>
-public class BurnPdfCommand : IRequest
-{
-}
+public record BurnPdfCommand(byte[] SourceBuffer, List<string> InstantJSONList, int EnvelopeId) : IRequest<byte[]>;
 
 /// <summary>
 /// 
 /// </summary>
-public class BurnPdfCommandHandler : IRequestHandler<BurnPdfCommand>
+public class BurnPdfCommandHandler : IRequestHandler<BurnPdfCommand, byte[]>
 {
     /// <summary>
     /// 
@@ -52,26 +50,6 @@ public class BurnPdfCommandHandler : IRequestHandler<BurnPdfCommand>
         _logger = logger;
     }
 
-    /// <summary>
-    /// 
-    /// </summary>
-    /// <param name="pSourceBuffer"></param>
-    /// <param name="pInstantJSONList"></param>
-    /// <param name="envelopeId"></param>
-    /// <returns></returns>
-    public byte[] BurnAnnotsToPDF(byte[] pSourceBuffer, List<string> pInstantJSONList, int envelopeId)
-    {
-        // read the elements of envelope with their annotations
-        var elements = _signRepo
-            .Where(sig => sig.Document.EnvelopeId == envelopeId)
-            .Include(sig => sig.Annotations)
-            .ToList();
-
-        return elements.Any()
-            ? BurnElementAnnotsToPDF(pSourceBuffer, elements)
-            : BurnInstantJSONAnnotsToPDF(pSourceBuffer, pInstantJSONList);
-    }
-
     /// <summary>
     /// 
     /// </summary>
@@ -347,6 +325,7 @@ public class BurnPdfCommandHandler : IRequestHandler<BurnPdfCommand>
             _manager.AddFreeHandAnnot(oColor, oPoints);
         }
     }
+
     private void AddInkAnnotation(Annotation pAnnotation)
     {
         var oSegments = pAnnotation.Lines?.Points;
@@ -388,11 +367,19 @@ public class BurnPdfCommandHandler : IRequestHandler<BurnPdfCommand>
     /// 
     /// </summary>
     /// <param name="request"></param>
-    /// <param name="cancellationToken"></param>
+    /// <param name="cancel"></param>
     /// <returns></returns>
     /// <exception cref="NotImplementedException"></exception>
-    public Task Handle(BurnPdfCommand request, CancellationToken cancellationToken)
+    public async Task<byte[]> Handle(BurnPdfCommand request, CancellationToken cancel)
     {
-        throw new NotImplementedException();
+        // read the elements of envelope with their annotations
+        var elements = await _signRepo
+            .Where(sig => sig.Document.EnvelopeId == request.EnvelopeId)
+            .Include(sig => sig.Annotations)
+            .ToListAsync(cancel);
+
+        return elements.Count > 0
+            ? BurnElementAnnotsToPDF(request.SourceBuffer, elements)
+            : BurnInstantJSONAnnotsToPDF(request.SourceBuffer, request.InstantJSONList);
     }
 }

EnvelopeGenerator.Domain/Entities/Signature.cs

@@ -2,10 +2,11 @@
 using System.ComponentModel;
 using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
-using System.Text.Json.Serialization;
 #if NETFRAMEWORK
 using System;
 using System.Collections.Generic;
+#elif NET
+using System.Text.Json.Serialization;
 #endif
 
 namespace EnvelopeGenerator.Domain.Entities