implement

dotnet/AipsCore/Domain/Models/Whiteboard/Whiteboard.AddUser.cs

@@ -0,0 +1,42 @@
+using System.Runtime.InteropServices.Swift;
+using AipsCore.Domain.Abstract;
+using AipsCore.Domain.Common.Validation;
+using AipsCore.Domain.Models.Whiteboard.Enums;
+using AipsCore.Domain.Models.Whiteboard.Validation;
+using AipsCore.Domain.Models.Whiteboard.ValueObjects;
+using AipsCore.Domain.Models.WhiteboardMembership.External;
+
+namespace AipsCore.Domain.Models.Whiteboard;
+
+public partial class Whiteboard : DomainModel<WhiteboardId>
+{
+    public async Task AddUserAsync(
+        User.User user, 
+        IWhiteboardMembershipRepository membershipRepository, 
+        CancellationToken cancellationToken = default)
+    {
+        var membership 
+            = await membershipRepository.GetByWhiteboardAndUserAsync(this.Id, user.Id, cancellationToken);
+
+        if (membership is not null)
+        {
+            throw new ValidationException(WhiteboardErrors.UserAlreadyAdded(user.Id));
+        }
+
+        membership = WhiteboardMembership.WhiteboardMembership.Create(
+            this.Id.ToString(),
+            user.Id.ToString(),
+            false,
+            false,
+            this.GetCanJoin(),
+            DateTime.Now
+        );
+        
+        await membershipRepository.AddAsync(membership, cancellationToken);
+    }
+
+    private bool GetCanJoin()
+    {
+        return this.JoinPolicy == WhiteboardJoinPolicy.FreeToJoin;
+    }
+}