refactor(ReadEnvelopeReceiverQuery): add receiver filter to signatures

EnvelopeGenerator.Application/Common/Query/ReceiverQueryBase.cs

@@ -20,4 +20,14 @@ public record ReceiverQueryBase
     /// Eindeutige Signatur des Empfängers
     /// </summary>
     public virtual string? Signature { get; set; }
+
+    /// <summary>
+    /// Checks whether any of the specified query criteria have a value.
+    /// </summary>
+    /// <remarks>
+    /// This property returns <c>true</c> if at least one of the fields 
+    /// <see cref="Id"/>, <see cref="EmailAddress"/>, or <see cref="Signature"/> is not null.
+    /// <para>Usage example: The query can be executed only if at least one criterion is specified.</para>
+    /// </remarks>
+    public bool HasAnyCriteria => Id is not null || EmailAddress is not null || Signature is not null;
 }

EnvelopeGenerator.Application/EnvelopeReceivers/Queries/ReadEnvelopeReceiverQuery.cs

@@ -91,6 +91,8 @@ public class ReadEnvelopeReceiverQueryHandler : IRequestHandler<ReadEnvelopeRece
 {
     private readonly IRepository<EnvelopeReceiver> _repo;
 
+    private readonly IRepository<Receiver> _rcvRepo;
+
     private readonly IMapper _mapper;
 
     /// <summary>
@@ -98,10 +100,11 @@ public class ReadEnvelopeReceiverQueryHandler : IRequestHandler<ReadEnvelopeRece
     /// </summary>
     /// <param name="envelopeReceiver"></param>
     /// <param name="mapper"></param>
-    public ReadEnvelopeReceiverQueryHandler(IRepository<EnvelopeReceiver> envelopeReceiver, IMapper mapper)
+    public ReadEnvelopeReceiverQueryHandler(IRepository<EnvelopeReceiver> envelopeReceiver, IRepository<Receiver> rcvRepo, IMapper mapper)
     {
         _repo = envelopeReceiver;
         _mapper = mapper;
+        _rcvRepo = rcvRepo;
     }
 
     /// <summary>
@@ -138,6 +141,14 @@ public class ReadEnvelopeReceiverQueryHandler : IRequestHandler<ReadEnvelopeRece
                         .Include(er => er.Receiver)
                         .ToListAsync(cancel);
 
+        if (request.Receiver.HasAnyCriteria && envRcvs.Any())
+        {
+            var receiver = await _rcvRepo.ReadOnly().Where(request.Receiver).FirstAsync(cancel);
+
+            foreach (var envRcv in envRcvs)
+                envRcv.Envelope?.Documents?.First().Elements.RemoveAll(s => s.ReceiverId != receiver.Id);
+        }
+
         return _mapper.Map<List<EnvelopeReceiverDto>>(envRcvs);
     }
 }