Bug CookieContainer?

https://stackoverflow.com/questions/1047669

20-08-2019
|

Domanda

Sono confuso su come CookieContainer gestisce il dominio, quindi creo questo test. Questo test mostra che cookieContainer non restituisce alcun cookie per & Quot; example.com & Quot; ma secondo RFC dovrebbe restituire almeno 2 cookie.

Non è un bug?

Come farlo funzionare?

Ecco una discussione su questo errore:

http: / /social.msdn.microsoft.com/Forums/en-US/ncl/thread/c4edc965-2dc2-4724-8f08-68815cf1dce6

<%@ Page Language="C#" %>

<%@ Import Namespace="System.Net" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    CookieContainer getContainer()
    {
        CookieContainer result = new CookieContainer();

        Uri uri = new Uri("http://sub.example.com");
        string cookieH = @"Test1=val; domain=sub.example.com; path=/";
        result.SetCookies(uri, cookieH);

        cookieH = @"Test2=val; domain=.example.com; path=/";
        result.SetCookies(uri, cookieH);

        cookieH = @"Test3=val; domain=example.com; path=/";
        result.SetCookies(uri, cookieH);

        return result;
    }

    void Test()
    {
        CookieContainer cookie = getContainer();
        lblResult.Text += "<br>Total cookies count: " + cookie.Count + " &nbsp;&nbsp; expected: 3";

        Uri uri = new Uri("http://sub.example.com");
        CookieCollection coll = cookie.GetCookies(uri);
        lblResult.Text += "<br>For " + uri + " Cookie count: " + coll.Count + " &nbsp;&nbsp; expected: 2";

        uri = new Uri("http://other.example.com");
        coll = cookie.GetCookies(uri);
        lblResult.Text += "<br>For " + uri + " Cookie count: " + coll.Count + " &nbsp;&nbsp; expected: 2";

        uri = new Uri("http://example.com");
        coll = cookie.GetCookies(uri);
        lblResult.Text += "<br>For " + uri + " Cookie count: " + coll.Count + " &nbsp;&nbsp; expected: 2";

    }

    protected void Page_Load(object sender, EventArgs e)
    {
        Test();
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>CookieContainer Test Page</title>
</head>
<body>
    <form id="frmTest" runat="server">
    <asp:Label ID="lblResult" EnableViewState="false" runat="server"></asp:Label>
    </form>
</body>
</html>

Soluzione

Ho appena trovato la correzione per questo errore e ho discusso qui: http: // dot-net-expertise .blogspot.com / 2009/10 / CookieContainer-domain-movimentazione-bug-fix.html

Ecco la soluzione:

Non utilizzare il metodo .Add (Cookie), Usa solo .Add (Uri, Cookie).

Chiama BugFix_CookieDomain ogni volta che aggiungi un cookie al contenitore o prima di usare .GetCookie o prima che il sistema usi il contenitore.

private void BugFix_CookieDomain(CookieContainer cookieContainer)
{
    System.Type _ContainerType = typeof(CookieContainer);
    Hashtable table = (Hashtable)_ContainerType.InvokeMember("m_domainTable",
                               System.Reflection.BindingFlags.NonPublic |
                               System.Reflection.BindingFlags.GetField |
                               System.Reflection.BindingFlags.Instance,
                               null,
                               cookieContainer,
                               new object[] { });
    ArrayList keys = new ArrayList(table.Keys);
    foreach (string keyObj in keys)
    {
        string key = (keyObj as string);
        if (key[0] == '.')
        {
            string newKey = key.Remove(0, 1);
            table[newKey] = table[keyObj];
        }
    }
}

Altri suggerimenti

Alla fine lo risolveranno: https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback. aspx? FeedbackID = 478.521

//bug fix, exists only in 3.5 FW, please wrap it with defines
//http://dot-net-expertise.blogspot.com/2009/10/cookiecontainer-domain-handling-bug-fix.html
if(!value.Contains("://www.")) //we are going to hit the bug
{
    string urlWWW = value.Replace("://", "://www.");
    Uri uriWWW = new Uri(urlWWW);
    foreach (Cookie c in _cookieContainer.GetCookies(uriWWW))
        if (c.Domain.StartsWith("."))
            request.Headers["Cookies"] += c.Name + "=" + c.Value + ";"; //manually add the cookies
}
//~bug fix

Ho perso la giornata con questo problema. La risposta di CallMeLaNN non mi ha aiutato (sto usando .Net 4.5). Nel mio caso il problema era nell'impostazione del corpo della richiesta e dei cookie delle impostazioni.

In questo caso i cookie non verranno inviati al server:

            var response = (HttpWebRequest)WebRequest.Create("http://localhost:4433/");

            using (var requestStream = response.GetRequestStream())
            {
               using (var streamWriter = new StreamWriter(requestStream))
               {
                    requestStream.Write(RequestContent);
               }
            }

            response.CookieContainer.Add(new Cookie("Name", "Value"));
            await response.GetResponseAsync();

Per farlo funzionare è necessario cambiare l'ordine:

            var response = (HttpWebRequest)WebRequest.Create("http://localhost:4433/");

            response.CookieContainer.Add(new Cookie("Name", "Value"));
            await response.GetResponseAsync();

            using (var requestStream = response.GetRequestStream())
            {
               using (var streamWriter = new StreamWriter(requestStream))
               {
                    requestStream.Write(RequestContent);
               }
            }

Ho creato una correzione per questo problema che funziona con le app Windows 10 / UWP / .NET Core. Il problema è che gli interni per CookieContainer sono diversi, ma altrettanto scadenti, come lo sono in .NET Framework. Quindi la soluzione accettata non funziona più.

Ma invece di " fissaggio " il GetCookies(), ho appena scritto una versione di <=> che ottiene tutti i cookie per un determinato dominio con una stringa, indipendentemente dalla loro " secure " stato o se sono preceduti da un punto. Sentiti libero di modificarlo come ritieni opportuno per le tue esigenze e vedrò come implementarne una versione in una futura versione di .NET Core.

using System.Collections.Generic;
using System.Reflection;

namespace System.Net
{

    /// <summary>
    /// Contains extensions for the <see cref="CookieContaner"/> class.
    /// </summary>
    public static class CookieContainerExtensions
    {

        /// <summary>
        /// Uses Reflection to get ALL of the <see cref="Cookie">Cookies</see> where <see cref="Cookie.Domain"/> 
        /// contains part of the specified string. Will return cookies for any subdomain, as well as dotted-prefix cookies. 
        /// </summary>
        /// <param name="cookieContainer">The <see cref="CookieContainer"/> to extract the <see cref="Cookie">Cookies</see> from.</param>
        /// <param name="domain">The string that contains part of the domain you want to extract cookies for.</param>
        /// <returns></returns>
        public static IEnumerable<Cookie> GetCookies(this CookieContainer cookieContainer, string domain)
        {
            var domainTable = GetFieldValue<dynamic>(cookieContainer, "_domainTable");
            foreach (var entry in domainTable)
            {
                string key = GetPropertyValue<string>(entry, "Key");

                if (key.Contains(domain))
                {
                    var value = GetPropertyValue<dynamic>(entry, "Value");

                    var internalList = GetFieldValue<SortedList<string, CookieCollection>>(value, "_list");
                    foreach (var li in internalList)
                    {
                        foreach (Cookie cookie in li.Value)
                        {
                            yield return cookie;
                        }
                    }
                }
            }
        }

        /// <summary>
        /// Gets the value of a Field for a given object instance.
        /// </summary>
        /// <typeparam name="T">The <see cref="Type"/> you want the value to be converted to when returned.</typeparam>
        /// <param name="instance">The Type instance to extract the Field's data from.</param>
        /// <param name="fieldName">The name of the Field to extract the data from.</param>
        /// <returns></returns>
        internal static T GetFieldValue<T>(object instance, string fieldName)
        {
            BindingFlags bindFlags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static;
            FieldInfo fi = instance.GetType().GetField(fieldName, bindFlags);
            return (T)fi.GetValue(instance);
        }

        /// <summary>
        /// Gets the value of a Property for a given object instance.
        /// </summary>
        /// <typeparam name="T">The <see cref="Type"/> you want the value to be converted to when returned.</typeparam>
        /// <param name="instance">The Type instance to extract the Property's data from.</param>
        /// <param name="propertyName">The name of the Property to extract the data from.</param>
        /// <returns></returns>
        internal static T GetPropertyValue<T>(object instance, string propertyName)
        {
            var pi = instance.GetType().GetProperty(propertyName);
            return (T)pi.GetValue(instance, null);
        }

    }

}

Ecco un trucco per aggirare questo errore: http://social.microsoft. com / Forum / it-IT / netfxnetcom / thread / 1297afc1-12d4-4d75-8d3f-7563222d234c Usa la riflessione.

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