Add GetAnnotsOfReceiver method to AnnotationController

Introduced the `GetAnnotsOfReceiver` method in `AnnotationController` to handle HTTP GET requests for retrieving receiver-specific annotations. The method enforces authorization using the `Receiver` policy, fetches the document via a mediator query, and filters signatures based on the current receiver. Returns appropriate HTTP responses for empty documents or missing signatures.

Added new `using` directives for required dependencies and reorganized imports for better readability. Included a `TODO` comment for potential future updates.

EnvelopeGenerator.API/Controllers/AnnotationController.cs

@@ -1,16 +1,19 @@
 using DigitalData.Core.Abstraction.Application.DTO;
 using DigitalData.Core.Exceptions;
+using EnvelopeGenerator.API.Extensions;
+using EnvelopeGenerator.Application.Common.Dto;
 using EnvelopeGenerator.Application.Common.Extensions;
 using EnvelopeGenerator.Application.Common.Interfaces.Services;
 using EnvelopeGenerator.Application.Common.Notifications.DocSigned;
+using EnvelopeGenerator.Application.Documents.Queries;
 using EnvelopeGenerator.Application.EnvelopeReceivers.Queries;
 using EnvelopeGenerator.Application.Histories.Queries;
 using EnvelopeGenerator.Domain.Constants;
-using EnvelopeGenerator.API.Extensions;
 using MediatR;
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.Cookies;
 using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Components.Forms;
 using Microsoft.AspNetCore.Mvc;
 
 namespace EnvelopeGenerator.API.Controllers;
@@ -115,4 +118,32 @@ public class AnnotationController : ControllerBase
         _logger.LogNotice(histRes.Notices);
         return StatusCode(500, histRes.Messages);
     }
+    
+    //TODO: update to use 
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="envelopeKey"></param>
+    /// <param name="cancel"></param>
+    /// <returns></returns>
+    [Authorize(Policy = AuthPolicy.Receiver)]
+    [HttpGet("{envelopeKey}")]
+    public async Task<IActionResult> GetAnnotsOfReceiver(string envelopeKey, CancellationToken cancel)
+    {
+        int envelopeId = User.GetEnvelopeIdOfReceiver();
+
+        int receiverId = User.GetReceiverIdOfReceiver();
+
+        var doc = await _mediator.Send(new ReadDocumentQuery() { EnvelopeId = envelopeId }, cancel);
+
+        if (doc.Elements is not IEnumerable<SignatureDto> docSignatures)
+            return NotFound("Document is empty.");
+
+        var rcvSignatures = docSignatures.Where(s => s.ReceiverId == receiverId).ToList();
+
+        if (rcvSignatures is null)
+            return NotFound("No signatures found for the current receiver.");
+        else
+            return Ok(rcvSignatures);
+    }
 }