如何制作一种方法来验证 cookie 身份验证？ ASP.NET 核心 3.1

Question

I've tried make a method to to validate a cookie authentication but appear this error: Error

I've tried use this:

public int CookieValidation()
    {
        int answer = 0;

        
        string CookieSession = HttpContext.Session.GetString("SesionSecondApp");

        if(!String.IsNullOrEmpty(CookieSession))
        {
            answer = 1;
        }
        

        return answer;
    }
}

I made a cookie authentication:

services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
            .AddCookie(options =>
            {
                options.Cookie.Name = "SesionSecondApp";
                options.ExpireTimeSpan = TimeSpan.FromDays(7);
                options.Cookie.SameSite = SameSiteMode.Lax;

            });

Use this claims:

var claims = new List<Claim>
        {
            new Claim(ClaimTypes.Email, email),
            new Claim(ClaimTypes.Role, role),
        };

        var identity = new ClaimsIdentity(claims, CookieAuthenticationDefaults.AuthenticationScheme);
        var principal = new ClaimsPrincipal(identity);
        var props = new AuthenticationProperties();

        HttpContext.SignInAsync(CookieAuthenticationDefaults.AuthenticationScheme, principal, props);

Answer 1

In the browser, cookie stores the authentication configuration that has been added in the server. SesionSecondApp cannot be obtained from the session here, because you did not configure session.

The correct way to get SesionSecondApp is this code.

public int CookieValidation()
    {
        int answer = 0;
        var getCookie = "";
        HttpContext.Request.Cookies.TryGetValue("SesionSecondApp", out getCookie);
        //...
        return answer;
    }

Result: