C# WebClient 登录到 accounts.google.com

Question

我很难尝试使用 webclient 向 accounts.google.com 进行身份验证

我正在使用 C# WebClient 对象来实现以下目标。

我正在向 https://accounts.google.com/ServiceLoginAuth?service=oz 提交表单域

这是 POST 字段:

service=oz
dsh=-8355435623354577691
GALX=33xq1Ma_CKI
timeStmp=
secTok=
Email=test@test.xom
Passwd=password
signIn=Sign in
PersistentCookie=yes
rmShown=1

现在，当我在提交数据之前加载登录页面时，它具有以下 header :

Content-Type                text/html; charset=UTF-8
Strict-Transport-Security   max-age=2592000; includeSubDomains
Set-Cookie                  GAPS=1:QClFh_dKle5DhcdGwmU3m6FiPqPoqw:SqdLB2u4P2oGjt_x;Path=/;Expires=Sat, 21-Dec-2013 07:31:40 GMT;Secure;HttpOnly
Cache-Control               no-cache, no-store
Pragma                      no-cache
Expires                     Mon, 01-Jan-1990 00:00:00 GMT
X-Frame-Options             Deny
X-Auto-Login                realm=com.google&args=service%3Doz%26continue%3Dhttps%253A%252F%252Faccounts.google.com%252FManageAccount
Content-Encoding            gzip
Transfer-Encoding           chunked
Date                        Thu, 22 Dec 2011 07:31:40 GMT
X-Content-Type-Options      nosniff
X-XSS-Protection            1; mode=block
Server                      GSE

现在我该如何使用 WebClient 类来包含这些 header ？

我试过 webClient_.Headers.Add(); 但效果有限，总是返回登录页面。

下面是我使用的一个类。非常感谢任何帮助。

---

获取登录页面

    public void LoginPageRequest(Account acc)
    {

        var rparams = new RequestParams();
        rparams.URL = @"https://accounts.google.com/ServiceLoginAuth?service=oz";
        rparams.RequestName = "LoginPage";
        rparams.Account = acc;

        webClient_.DownloadDataAsync(new Uri(rparams.URL), rparams);
    }

    void webClient__DownloadDataCompleted(object sender, DownloadDataCompletedEventArgs e)
    {
        RequestParams rparams = (RequestParams)e.UserState;

        if (rparams.RequestName == "LoginPage")
        {
            ParseLoginRequest(e.Result, e.UserState);
        }
    }

现在使用 HtmlAgilityPack 获取表单字段并将它们添加到参数集合中

    public void ParseLoginRequest(byte[] data, object UserState)
    {
        RequestParams rparams = (RequestParams)UserState;

        rparams.ClearParams();

        ASCIIEncoding encoder = new ASCIIEncoding();

        string html = encoder.GetString(data);

        HtmlNode.ElementsFlags.Remove("form");

        HtmlDocument doc = new HtmlDocument();
        doc.LoadHtml(html);

        HtmlNode form = doc.GetElementbyId("gaia_loginform");

        rparams.URL = form.GetAttributeValue("action", string.Empty);
        rparams.RequestName = "LoginPost";

        var inputs = form.Descendants("input");
        foreach (var element in inputs)
        {
            string name = element.GetAttributeValue("name", "undefined");
            string value = element.GetAttributeValue("value", "");
            if (!name.Equals("undefined")) {

                if (name.ToLower().Equals("email"))
                {
                    value = rparams.Account.Email;
                }
                else if (name.ToLower().Equals("passwd"))
                {
                    value = rparams.Account.Password;
                }

                rparams.AddParam(name,value);
                Console.WriteLine(name + "-" + value);
            }
        }

        webClient_.UploadValuesAsync(new Uri(rparams.URL),"POST", rparams.GetParams,rparams);

在我发布数据后，我得到的是登录页面，而不是重定向或成功消息。

我做错了什么？

Answer 1

经过一番摸索，WebClient 类似乎不是解决这个特定问题的最佳方法。

为了实现以下目标，我必须跳到 WebRequest 下一级。

当制作 WebRequest (HttpWebRequest) 和使用 HttpWebResponse 时，可以设置 CookieContainer

        webRequest_ = (HttpWebRequest)HttpWebRequest.Create(rparams.URL);

        webRequest_.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
        CookieContainer cookieJar = new CookieContainer();
        webRequest_.CookieContainer = cookieJar;

        string html = string.Empty;

        try
        {
            using (WebResponse response = webRequest_.GetResponse())
            {
                using (var streamReader = new StreamReader(response.GetResponseStream()))
                {
                    html = streamReader.ReadToEnd();
                    ParseLoginRequest(html, response,cookieJar);
                }
            }
        }
        catch (WebException e)
        {
            using (WebResponse response = e.Response)
            {
                HttpWebResponse httpResponse = (HttpWebResponse)response;
                Console.WriteLine("Error code: {0}", httpResponse.StatusCode);
                using (var streamReader = new StreamReader(response.GetResponseStream()))
                    Console.WriteLine(html = streamReader.ReadToEnd());
            }
        }

然后在发帖时按以下方式使用相同的 Cookie 容器

        webRequest_ = (HttpWebRequest)HttpWebRequest.Create(rparams.URL);

        webRequest_.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
        webRequest_.Method = "POST";
        webRequest_.ContentType = "application/x-www-form-urlencoded";
        webRequest_.CookieContainer = cookieJar;

        var parameters = new StringBuilder();

        foreach (var key in rparams.Params)
        {
            parameters.AppendFormat("{0}={1}&",HttpUtility.UrlEncode(key.ToString()),
                HttpUtility.UrlEncode(rparams.Params[key.ToString()]));
        }

        parameters.Length -= 1;

        using (var writer = new StreamWriter(webRequest_.GetRequestStream()))
        {
            writer.Write(parameters.ToString());
        }

        string html = string.Empty;

        using (response = webRequest_.GetResponse())
        {
            using (var streamReader = new StreamReader(response.GetResponseStream()))
            {
                html = streamReader.ReadToEnd();

            }
        }

所以这是可行的，此代码不用于生产，可以/应该进行优化。 仅作为示例。