[PM-3797 Part 4] Add Sends to new Key Rotation (#3442)

* add send validation

* add send repo methods

* add send rotation to delegate list

* add success test

src/Api/Tools/Validators/SendRotationValidator.cs

@@ -0,0 +1,57 @@
+using Bit.Api.Auth.Validators;
+using Bit.Api.Tools.Models.Request;
+using Bit.Core.Entities;
+using Bit.Core.Exceptions;
+using Bit.Core.Tools.Entities;
+using Bit.Core.Tools.Repositories;
+using Bit.Core.Tools.Services;
+
+namespace Bit.Api.Tools.Validators;
+
+/// <summary>
+/// Send implementation for <see cref="IRotationValidator{T,R}"/>
+/// </summary>
+public class SendRotationValidator : IRotationValidator<IEnumerable<SendWithIdRequestModel>, IReadOnlyList<Send>>
+{
+    private readonly ISendService _sendService;
+    private readonly ISendRepository _sendRepository;
+
+    /// <summary>
+    /// Instantiates a new <see cref="SendRotationValidator"/>
+    /// </summary>
+    /// <param name="sendService">Enables conversion of <see cref="SendWithIdRequestModel"/> to <see cref="Send"/></param>
+    /// <param name="sendRepository">Retrieves all user <see cref="Send"/>s</param>
+    public SendRotationValidator(ISendService sendService, ISendRepository sendRepository)
+    {
+        _sendService = sendService;
+        _sendRepository = sendRepository;
+    }
+
+    public async Task<IReadOnlyList<Send>> ValidateAsync(User user, IEnumerable<SendWithIdRequestModel> sends)
+    {
+        var result = new List<Send>();
+        if (sends == null || !sends.Any())
+        {
+            return result;
+        }
+
+        var existingSends = await _sendRepository.GetManyByUserIdAsync(user.Id);
+        if (existingSends == null || !existingSends.Any())
+        {
+            return result;
+        }
+
+        foreach (var existing in existingSends)
+        {
+            var send = sends.FirstOrDefault(c => c.Id == existing.Id);
+            if (send == null)
+            {
+                throw new BadRequestException("All existing folders must be included in the rotation.");
+            }
+
+            result.Add(send.ToSend(existing, _sendService));
+        }
+
+        return result;
+    }
+}