hcs/Hcs.WebApp/Identity/IdentityComponentsEndpointRouteBuilderExtensions.cs

using Hcs.WebApp.Data;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using System.Security.Claims;

namespace Hcs.WebApp.Identity
{
    internal static class IdentityComponentsEndpointRouteBuilderExtensions
    {
        public static IEndpointConventionBuilder MapAdditionalIdentityEndpoints(this IEndpointRouteBuilder endpoints)
        {
            ArgumentNullException.ThrowIfNull(endpoints);

            var accountGroup = endpoints.MapGroup("/account");
            accountGroup.MapPost("/logout", async (
                ClaimsPrincipal user,
                SignInManager<AppUser> signInManager,
                [FromForm] string returnUrl) =>
            {
                await signInManager.SignOutAsync();
                return TypedResults.LocalRedirect($"~/{returnUrl}");
            });

            return accountGroup;
        }
    }
}