是否可以将ASP.NET OWIN设置为以随机/偶然的间隔挑战用户以获取2FA代码？

public class RandomChallengeMiddleware : OwinMiddleware
{
    public RandomChallengeMiddleware(OwinMiddleware next) : base(next)
    {
    }

    public override async Task Invoke(IOwinContext context)
    {
        // 检查用户是否已通过身份验证
        if (context.Authentication.User.Identity.IsAuthenticated)
        {
            // 检查用户是否已设置2FA
            if (!context.Authentication.User.HasClaim("2FAEnabled", "true"))
            {
                await Next.Invoke(context);
                return;
            }

            // 检查用户会话中是否存在挑战
            string challenge = context.Authentication.User.FindFirstValue("2FAChallenge");
            if (string.IsNullOrEmpty(challenge))
            {
                // 生成新的挑战
                challenge = GenerateRandomChallenge();
                context.Authentication.User.AddIdentity(new ClaimsIdentity(new[]
                {
                    new Claim("2FAChallenge", challenge)
                }));
            }

            // 检查挑战是否已过期
            if (IsChallengeExpired(challenge))
            {
                // 生成新的挑战
                challenge = GenerateRandomChallenge();
                context.Authentication.User.FindFirst("2FAChallenge").Value = challenge;
            }

            // 发送挑战给用户
            await context.Response.WriteAsync($"Please enter the 2FA code for challenge: {challenge}");
            return;
        }

        await Next.Invoke(context);
    }

    private string GenerateRandomChallenge()
    {
        // 生成随机的挑战
        return "RandomChallenge";
    }

    private bool IsChallengeExpired(string challenge)
    {
        // 检查挑战是否已过期
        return false;
    }
}

public void Configuration(IAppBuilder app)
{
    app.Use<RandomChallengeMiddleware>();
    // 其他中间件和配置
}