Join with code endpoint and command

dotnet/AipsCore/Application/Models/Whiteboard/Command/JoinWithCode/JoinWithCodeCommand.cs

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+using AipsCore.Application.Abstract.Command;
+
+namespace AipsCore.Application.Models.Whiteboard.Command.JoinWithCode;
+
+public record JoinWithCodeCommand(string Code): ICommand<JoinWithCodeDto>;

dotnet/AipsCore/Application/Models/Whiteboard/Command/JoinWithCode/JoinWithCodeCommandHandler.cs

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+using AipsCore.Application.Abstract.Command;
+using AipsCore.Application.Abstract.UserContext;
+using AipsCore.Domain.Abstract;
+using AipsCore.Domain.Common.Validation;
+using AipsCore.Domain.Models.Whiteboard.External;
+using AipsCore.Domain.Models.Whiteboard.Validation;
+using AipsCore.Domain.Models.Whiteboard.ValueObjects;
+using AipsCore.Domain.Models.WhiteboardMembership.Enums;
+using AipsCore.Domain.Models.WhiteboardMembership.External;
+
+namespace AipsCore.Application.Models.Whiteboard.Command.JoinWithCode;
+
+public class JoinWithCodeCommandHandler : ICommandHandler<JoinWithCodeCommand, JoinWithCodeDto>
+{
+    private readonly IWhiteboardRepository _whiteboardRepository;
+    private readonly IWhiteboardMembershipRepository _whiteboardMembershipRepository;
+    private readonly IUnitOfWork _unitOfWork;
+    private readonly IUserContext _userContext;
+
+    public JoinWithCodeCommandHandler(
+        IWhiteboardRepository whiteboardRepository,
+        IWhiteboardMembershipRepository whiteboardMembershipRepository,
+        IUnitOfWork unitOfWork, 
+        IUserContext userContext)
+    {
+        _whiteboardRepository = whiteboardRepository;
+        _whiteboardMembershipRepository = whiteboardMembershipRepository;
+        _unitOfWork = unitOfWork;
+        _userContext = userContext;
+    }
+
+    public async Task<JoinWithCodeDto> Handle(JoinWithCodeCommand command, CancellationToken cancellationToken = default)
+    {
+        var userId = _userContext.GetCurrentUserId();
+        
+        var code = new WhiteboardCode(command.Code);
+        var whiteboard = await _whiteboardRepository.GetByCodeAsync(code, cancellationToken);
+
+        if (whiteboard is null)
+        {
+            throw new ValidationException(WhiteboardErrors.NotFound(code));
+        }
+
+        if (!whiteboard.ShouldRequestToJoin(userId))
+        {
+            return new JoinWithCodeDto(whiteboard.Id.IdValue, WhiteboardMembershipStatus.Accepted);
+        }
+
+        var membership = await _whiteboardMembershipRepository.GetByWhiteboardAndUserAsync(whiteboard.Id, userId, cancellationToken);
+        
+        if (membership is null)
+        {
+            membership = whiteboard.RequestJoin(userId);
+        }
+        else
+        {
+            whiteboard.RequestReJoin(membership);
+        }
+
+        await _whiteboardMembershipRepository.SaveAsync(membership, cancellationToken);
+        await _unitOfWork.SaveChangesAsync(cancellationToken);
+        
+        return new JoinWithCodeDto(whiteboard.Id.IdValue, membership.Status);
+    }
+}

dotnet/AipsCore/Application/Models/Whiteboard/Command/JoinWithCode/JoinWithCodeDto.cs

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+using AipsCore.Domain.Models.WhiteboardMembership.Enums;
+
+namespace AipsCore.Application.Models.Whiteboard.Command.JoinWithCode;
+
+public record JoinWithCodeDto(string WhiteboardId, WhiteboardMembershipStatus Status);