CookieExtensions.cs

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using System.Reflection;
 
namespace System.Net;
 
internal static class CookieExtensions
{
    private enum CookieVariant
    {
        Unknown = 0,
        Plain = 1,
        Rfc2109 = 2,
        Rfc2965 = 3,
        Default = 2
    }
 
    private static Func<Cookie, string> s_toServerStringFunc;
 
    private static Func<Cookie, Cookie> s_cloneFunc;
 
    private static Func<Cookie, CookieVariant> s_getVariantFunc;
 
    public static string ToServerString(this Cookie cookie)
    {
        if (s_toServerStringFunc == null)
        {
            s_toServerStringFunc = (Func<Cookie, string>)typeof(Cookie).GetMethod("ToServerString", BindingFlags.Instance | BindingFlags.NonPublic).CreateDelegate(typeof(Func<Cookie, string>));
        }
        return s_toServerStringFunc(cookie);
    }
 
    public static Cookie Clone(this Cookie cookie)
    {
        if (s_cloneFunc == null)
        {
            s_cloneFunc = (Func<Cookie, Cookie>)typeof(Cookie).GetMethod("Clone", BindingFlags.Instance | BindingFlags.NonPublic).CreateDelegate(typeof(Func<Cookie, Cookie>));
        }
        return s_cloneFunc(cookie);
    }
 
    public static bool IsRfc2965Variant(this Cookie cookie)
    {
        if (s_getVariantFunc == null)
        {
            s_getVariantFunc = (Func<Cookie, CookieVariant>)typeof(Cookie).GetProperty("Variant", BindingFlags.Instance | BindingFlags.NonPublic).GetGetMethod(nonPublic: true).CreateDelegate(typeof(Func<Cookie, CookieVariant>));
        }
        return s_getVariantFunc(cookie) == CookieVariant.Rfc2965;
    }
}