Get me and cors

dotnet/AipsCore/Application/Models/User/Query/GetMe/GetMeQuery.cs

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+using AipsCore.Application.Abstract.Query;
+
+namespace AipsCore.Application.Models.User.Query.GetMe;
+
+public record GetMeQuery : IQuery<GetMeQueryDto>;

dotnet/AipsCore/Application/Models/User/Query/GetMe/GetMeQueryDto.cs

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+namespace AipsCore.Application.Models.User.Query.GetMe;
+
+public record GetMeQueryDto(string UserName);

dotnet/AipsCore/Application/Models/User/Query/GetMe/GetMeQueryHandler.cs

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+using AipsCore.Application.Abstract.Query;
+using AipsCore.Application.Abstract.UserContext;
+using AipsCore.Domain.Common.Validation;
+using AipsCore.Domain.Models.User.Validation;
+using AipsCore.Domain.Models.User.ValueObjects;
+using AipsCore.Infrastructure.Persistence.Db;
+using Microsoft.EntityFrameworkCore;
+
+namespace AipsCore.Application.Models.User.Query.GetMe;
+
+public class GetMeQueryHandler : IQueryHandler<GetMeQuery, GetMeQueryDto>
+{
+    private readonly AipsDbContext _context;
+    private readonly IUserContext _userContext;
+
+    public GetMeQueryHandler(AipsDbContext context, IUserContext userContext)
+    {
+        _context = context;
+        _userContext = userContext;
+    }
+
+    public async Task<GetMeQueryDto> Handle(GetMeQuery query, CancellationToken cancellationToken = default)
+    {
+        var userId = _userContext.GetCurrentUserId();
+        
+        var result = await _context.Users
+            .Where(u => u.Id.ToString() == userId.IdValue)
+            .FirstOrDefaultAsync(cancellationToken);
+
+        if (result is null)
+        {
+            throw new ValidationException(UserErrors.NotFound(new UserId(userId.IdValue)));
+        }
+
+        return new GetMeQueryDto(result.UserName!);
+    }
+}