ASP.NET Core - 단순 쿠키 인증 작성

builder.Services.AddAuthentication("MyAuthScheme")
    .AddCookie("MyAuthScheme", options => {
        options.LoginPath = "/Login";
        options.LogoutPath = "/Logout";        
        options.AccessDeniedPath = "/AccessDenied";
    });

builder.Services.AddHttpContextAccessor();

app.UseAuthentication();
app.UseAuthorization();

app.MapRazorPages();
app.MapControllers();

using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authorization;
using System.Security.Claims;

private readonly IHttpContextAccessor _httpContextAccessor;
public Login(IHttpContextAccessor httpContextAccessor){ 
    _httpContextAccessor = httpContextAccessor;
}

// Validate login credentials here and get user details.

var claims = new List<Claim>
{
    new Claim(ClaimTypes.NameIdentifier, user.Id),
    new Claim(ClaimTypes.Name, user.Username),
    new Claim(ClaimTypes.Email, user.Email)
    // add or remove claims as necessary    
};

var claimsIdentity = new ClaimsIdentity(claims, "MyAuthScheme");

await _httpContextAccessor.HttpContext
    .SignInAsync("MyAuthScheme",
        new ClaimsPrincipal(claimsIdentity),
        new AuthenticationProperties());

// Redirect here

await _httpContextAccessor.HttpContext
            .SignOutAsync("MyAuthScheme");

// Redirect to login or other page

if(User.Identity.IsAuthenticated) {

    var username = User.Identity.Name;
    var email = User.Claims.Where(i => i.Type == "Email").FirstOrDefault().Value;
}

@if(User.Identity.IsAuthenticated) {
    <p>@User.Identity.Name</p>
    <p>@User.Claims.Where(i => i.Type == "Email").FirstOrDefault().Value</p>
}

if(_httpContextAccessor.HttpContext
    .User.Identity.IsAuthenticated) {
    //do something
}