Blazor Webassembly-IdentityServer EventSink和HttpContext

我正在使用IdentityServer在ASP.NET Core 3.1中开发Blazor Webassembly应用程序。当IdentityServer处理所有登录，注销，注册等事件时，我试图捕获这些事件，以获得有关用户的一些信息。

为了清楚起见，我试图记住登录日期，并捕获新用户的注册以自动给他们一些角色。

这是我在启动课程中使用的所有服务：

        services.AddDefaultIdentity<ApplicationUser>(options => options.SignIn.RequireConfirmedAccount = true)
            .AddRoles<IdentityRole>()
            .AddEntityFrameworkStores<ApplicationDbContext>();

        services.Configure<IdentityOptions>(options =>
            options.ClaimsIdentity.UserIdClaimType = ClaimTypes.NameIdentifier);

        services.AddIdentityServer()
            .AddApiAuthorization<ApplicationUser, ApplicationDbContext>(options => {
                options.IdentityResources["openid"].UserClaims.Add("name");
                options.ApiResources.Single().UserClaims.Add("name");
                options.IdentityResources["openid"].UserClaims.Add("role");
                options.ApiResources.Single().UserClaims.Add("role");
            });

        // Need to do this as it maps "role" to ClaimTypes.Role and causes issues
        JwtSecurityTokenHandler.DefaultInboundClaimTypeMap.Remove("role");

        services.AddAuthentication()
            .AddIdentityServerJwt();

我已经实现了IEventSink模式（http://docs.identityserver.io/en/stable/topics/events.html）：

public class IdentityServerEventSink : IEventSink
{
    private readonly UserManager<ApplicationUser> userManager;
    private readonly IHttpContextAccessor httpContextAccessor;

    public IdentityServerEventSink(UserManager<ApplicationUser> userManager, IHttpContextAccessor httpContextAccessor)
    {
        this.userManager = userManager;
        this.httpContextAccessor = httpContextAccessor;
    }

    public async Task PersistAsync(Event @event)
    {
        if (@event.Id.Equals(EventIds.ClientAuthenticationSuccess))
        {
            var identity = httpContextAccessor.HttpContext.User;
            var id = httpContextAccessor.HttpContext.User.FindFirstValue(ClaimTypes.NameIdentifier);
            var user = await userManager.Users.FirstOrDefaultAsync(u => u.Id == id);
        }
    }
}

并在startup.cs中：

services.AddHttpContextAccessor();
services.AddTransient<IEventSink, IdentityServerEventSink>();

但是当我进入ClientAuthenticationSuccess事件时，身份始终是匿名的。

我也在中间件中尝试过，但存在相同的问题：

            app.Use(async (context, next) =>
        {
            await next.Invoke();
            //handle response
            //you may also need to check the request path to check whether it requests image
            if (context.User.Identity.IsAuthenticated)
            {
                var userName = context.User.Identity.Name;
                //retrieve uer by userName
                using (var dbContext = context.RequestServices.GetRequiredService<ApplicationDbContext>())
                {
                    var user = dbContext.Users.Where(u => u.UserName == userName).FirstOrDefault();
                    user.LastLogon = System.DateTime.Now;
                    dbContext.Update(user);
                    dbContext.SaveChanges();
                }
            }
        });

你有什么想法 ？我听说HttpContextAccessor在Blazor中是一件坏事。