我很难尝试使用webclient对accounts.google.com进行身份验证
我正在使用C#WebClient对象来实现以下功能.
我将表单字段提交到https://accounts.google.com/ServiceLoginAuth?service=oz
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
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
好了,现在我如何使用WebClient Class来包含这些标题？
我试过webClient_.Headers.Add();但效果有限,总是返回登录页面.
以下是我使用的课程.非常感谢任何帮助.
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Parameters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);
我究竟做错了什么？
解决方法
在一些摆弄之后,看起来WebClient类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下面的一个级别.
在制作WebRequest(HttpWebRequest)并使用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());
}
}
然后在制作帖子时以下列方式使用相同的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();
}
}
所以这很有效,这段代码不适合生产使用,可以/应该进行优化.以此为例.
