GoogleReader用户登陆验证C#具体实现

继前两篇文章

google reader api：http://www.cnblogs.com/mybear/archive/2011/02/18/1957704.html

GoogleReader用户登陆验证原理：http://www.cnblogs.com/mybear/archive/2011/02/18/1957769.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：