GoogleReader用户登陆验证C#具体实现

继前两篇文章

google reader api：/article/5631248.html

GoogleReader用户登陆验证原理：/article/5631249.html

相信大家对GoogleReader api已经有所认识，下面就讲下GoogleReader用户登陆验证C#具体实现

1.创建HttpWebRequest

private HttpWebRequest CreateRequest(string url)
{
HttpWebRequest webRequest = WebRequest.Create(url) as HttpWebRequest;
IWebProxy defaultParoxy = HttpWebRequest.GetSystemWebProxy();
webRequest.Proxy = defaultParoxy;
webRequest.UserAgent = "GoogleReader for Windows/"+Assembly.GetExecutingAssembly().GetName().Version;
webRequest.CookieContainer = _CookieContainer;
webRequest.ServicePoint.Expect100Continue = false;
webRequest.Timeout = 20000;

if (_isLoginIn)
webRequest.Headers.Add("Authorization", "GoogleLogin auth=" + _LoginAuth[2].Split('=')[1]);
return webRequest;
}

2.使用HttpPost传递登陆参数

private string PostGoogleLogin(HttpWebRequest webRequest,string queryString)
{
string ResponseString = string.Empty;
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.Method = "POST";

byte[] QueryData = Encoding.UTF8.GetBytes(queryString);
webRequest.ContentLength = QueryData.Length;
try
{
using (Stream stream = webRequest.GetRequestStream())
{
stream.Write(QueryData, 0, QueryData.Length);
stream.Close();
ResponseString = GetResponseString(webRequest);
}
}
catch (Exception ex)
{
LoginError += ex.ToString() + "\r\n";
}
return ResponseString;
}

3.传递用户名和密码实现登陆

public void GoogleLogin(string email,string password)
{
string SID_ID = string.Empty;
string responseData = string.Empty;
List<Parameter> queryParams = new List<Parameter>();
queryParams.Add(new Parameter("service", "reader"));
queryParams.Add(new Parameter("Email", Uri.EscapeDataString(email)));
queryParams.Add(new Parameter("Passwd", Uri.EscapeDataString(password)));
queryParams.Add(new Parameter("source", "Mobile Newspaper/0.1"));
queryParams.Add(new Parameter("continue", "http://www.google.com"));

HttpWebRequest webRequest=CreateRequest("https://www.google.com/accounts/ClientLogin");

responseData = PostGoogleLogin(webRequest, HttpUtil.GetQueryParamters(queryParams));
string pattern="SID=(.*)";
Regex reg = new Regex(pattern, RegexOptions.IgnoreCase);
if (reg.IsMatch(responseData))
{
_isLoginIn = true;
_LoginAuth = responseData.Split('\n');
SID_ID = reg.Match(responseData).Groups[1].Value;
_CookieContainer.Add(new Cookie("SID",SID_ID,"/",".google.com"));
}
}

至此，google用户登陆验证完成了!我们可以根据googlereader提供的API打造一个属于自己的客户端RSS订阅器！

比如，我们要获得已阅读的20篇文章：可以用httpget的方法访问：http://www.google.com/reader/atom/user/[user ID]/state/com.google/read

[user ID]可以使用“-”来代表当前登陆的用户,返回的记录是XML数据格式：