Рабочий чат

backend/src/Modules/Auth/Application/Users/GetUsersExistenceHandler.cs

@@ -0,0 +1,31 @@
+using Knot.Shared.Kernel;
+using Knot.Contracts.Auth.Application.Abstractions;
+using Knot.Contracts.Auth.Domain;
+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Knot.Modules.Auth.Application.Users;
+
+internal sealed class GetUsersExistenceQueryHandler : IQueryHandler<GetUsersExistenceQuery, List<Guid>>
+{
+    private readonly IAuthDbContext _context;
+
+    public GetUsersExistenceQueryHandler(IAuthDbContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<Result<List<Guid>>> Handle(GetUsersExistenceQuery request, CancellationToken cancellationToken)
+    {
+        var existingIds = await _context.Set<Knot.Modules.Auth.Domain.User>()
+            .Where(u => request.UserIds.Contains(u.Id))
+            .Select(u => u.Id)
+            .ToListAsync(cancellationToken);
+
+        return Result.Success(existingIds);
+    }
+}

backend/src/Modules/Auth/Domain/User.cs

@@ -28,8 +28,14 @@ public sealed class User : AggregateRoot<Guid>
     public string? RefreshToken { get; private set; }
     public DateTime? BannedUntil { get; private set; }
 
-    public void Ban() => IsBanned = true;
-    public void Unban() => IsBanned = false;
+    public void Ban() {
+        IsBanned = true;
+        RaiseDomainEvent(new UserBannedDomainEvent(Id, true));
+    }
+    public void Unban() {
+        IsBanned = false;
+        RaiseDomainEvent(new UserBannedDomainEvent(Id, false));
+    }
 
     public void SetOnline(bool isOnline, DateTime? lastSeen = null)
     {