Windows Phone 7 Mango 保存 CookieContainer 的状态

Question

update1：​​经过更多研究，我不确定这是否可能，我创建了一个 UserVoice 条目来修复它。

我试图在应用程序退出时或发生逻辑删除时保存 CookieContainer，但遇到了一些问题。

我尝试将 CookieContainer 保存在 AppSettings 中，但加载时，cookie走了。

Researching this internally, DataContractSerializer cannot serialize cookies.
This seems to be a behavior that Windows Phone inherited from Silverlight's DataContractSerializer.

经过更多研究后，解决办法似乎是从容器中取出饼干并以其他方式保存它们。这一切都很好，直到我遇到另一个障碍。我无法使用 .mydomain.com 的 Uri 获取 Cookies。我相信这是因为这个错误。我可以在域表中看到 cookie .mydomain.com，但 GetCookies 不适用于该特定 cookie。

该错误再次发布在此处。

从容器中获取 cookie 也存在问题 当域名以 .: 开头时

CookieContainer container = new CookieContainer();
container.Add(new Cookie("x", "1", "/", ".blah.com"));
CookieCollection cv = container.GetCookies(new Uri("http://blah.com"));
cv = container.GetCookies(new Uri("http://w.blah.com"));

我找到了一种解决方法，使用反射来迭代域表并删除“.”前缀。

private void BugFix_CookieDomain(CookieContainer cookieContainer)
{
    System.Type _ContainerType = typeof(CookieContainer);
    var = _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];
        }
    }
}

仅当调用 InvokeMember 时，SL 中才会引发 MethodAccessException。这并不能真正解决我的问题，因为我需要保留的 cookie 之一是 HttpOnly，这也是 CookieContainer 的原因之一。

如果服务器发送 HTTPOnly cookie，您应该创建一个 System.Net.CookieContainer 对请求保存cookie， 尽管您不会看到或无法访问 cookie 存储在容器中。

那么，有什么想法吗？我错过了一些简单的事情吗？是否有另一种方法来保存 CookieContainer 的状态，或者我是否需要保存用户信息（包括密码）并在每次应用程序启动和从逻辑删除返回时重新验证它们？

Answer 1

我写了一个 CookieSerializer 专门解决这个问题。序列化器粘贴在下面。有关工作项目和方案，请访问该项目的 CodePlex 网站。

public static class CookieSerializer
{
    /// <summary>
    /// Serializes the cookie collection to the stream.
    /// </summary>
    /// <param name="cookies">You can obtain the collection through your <see cref="CookieAwareWebClient">WebClient</see>'s <code>CookieContainer.GetCookies(Uri)</code>-method.</param>
    /// <param name="address">The <see cref="Uri">Uri</see> that produced the cookies</param>
    /// <param name="stream">The stream to which to serialize</param>
    public static void Serialize(CookieCollection cookies, Uri address, Stream stream)
    {
        using (var writer = new StreamWriter(stream))
        {
            for (var enumerator = cookies.GetEnumerator(); enumerator.MoveNext();)
            {
                var cookie = enumerator.Current as Cookie;
                if (cookie == null) continue;
                writer.WriteLine(address.AbsoluteUri);
                writer.WriteLine(cookie.Comment);
                writer.WriteLine(cookie.CommentUri == null ? null : cookie.CommentUri.AbsoluteUri);
                writer.WriteLine(cookie.Discard);
                writer.WriteLine(cookie.Domain);
                writer.WriteLine(cookie.Expired);
                writer.WriteLine(cookie.Expires);
                writer.WriteLine(cookie.HttpOnly);
                writer.WriteLine(cookie.Name);
                writer.WriteLine(cookie.Path);
                writer.WriteLine(cookie.Port);
                writer.WriteLine(cookie.Secure);
                writer.WriteLine(cookie.Value);
                writer.WriteLine(cookie.Version);
            }
        }
    }

    /// <summary>
    /// Deserializes <see cref="Cookie">Cookie</see>s from the <see cref="Stream">Stream</see>, 
    /// filling the <see cref="CookieContainer">CookieContainer</see>.
    /// </summary>
    /// <param name="stream">Stream to read</param>
    /// <param name="container">Container to fill</param>
    public static void Deserialize(Stream stream, CookieContainer container)
    {
        using (var reader = new StreamReader(stream))
        {
            while (!reader.EndOfStream)
            {
                var uri = Read(reader, absoluteUri => new Uri(absoluteUri, UriKind.Absolute));
                var cookie = new Cookie();
                cookie.Comment = Read(reader, comment => comment);
                cookie.CommentUri = Read(reader, absoluteUri => new Uri(absoluteUri, UriKind.Absolute));
                cookie.Discard = Read(reader, bool.Parse);
                cookie.Domain = Read(reader, domain => domain);
                cookie.Expired = Read(reader, bool.Parse);
                cookie.Expires = Read(reader, DateTime.Parse);
                cookie.HttpOnly = Read(reader, bool.Parse);
                cookie.Name = Read(reader, name => name);
                cookie.Path = Read(reader, path => path);
                cookie.Port = Read(reader, port => port);
                cookie.Secure = Read(reader, bool.Parse);
                cookie.Value = Read(reader, value => value);
                cookie.Version = Read(reader, int.Parse);
                container.Add(uri, cookie);
            }
        }
    }

    /// <summary>
    /// Reads a value (line) from the serialized file, translating the string value into a specific type
    /// </summary>
    /// <typeparam name="T">Target type</typeparam>
    /// <param name="reader">Input stream</param>
    /// <param name="translator">Translation function - translate the read value into 
    /// <typeparamref name="T"/> if the read value is not <code>null</code>.
    /// <remarks>If the target type is <see cref="Uri">Uri</see> , the value is considered <code>null</code> if it's an empty string.</remarks> </param>
    /// <param name="defaultValue">The default value to return if the read value is <code>null</code>.
    /// <remarks>The translation function will not be called for null values.</remarks></param>
    /// <returns></returns>
    private static T Read<T>(TextReader reader, Func<string, T> translator, T defaultValue = default(T))
    {
        var value = reader.ReadLine();
        if (value == null)
            return defaultValue;
        if (typeof(T) == typeof(Uri) && String.IsNullOrEmpty(value))
            return defaultValue;
        return translator(value);
    }
}

Answer 2

即使使用反射，您也无法在 WP7 中访问程序集外部的私有成员。这是一项安全措施，旨在确保您无法调用内部系统 API。

看起来你可能不走运。