To import yahoo contacts in the web application (yahoo API)

using System;
using System.Collections.Specialized;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;

namespace Gnilly.Syndication.Mail
{
public class YahooExtract
{
private const string _addressBookUrl = "http://address.yahoo.com/yab/us/Yahoo_ab.csv?loc=us&.rand=1671497644&A=H&Yahoo_ab.csv";
private const string _authUrl = "https://login.yahoo.com/config/login?";
private const string _loginPage = "https://login.yahoo.com/config/login";
private const string _userAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3";

public bool Extract( NetworkCredential credential, out MailContactList list )
{
bool result = false;

list = new MailContactList();

try
{
WebClient webClient = new WebClient();
webClient.Headers[ HttpRequestHeader.UserAgent ] = _userAgent;
webClient.Encoding = Encoding.UTF8;

byte[] firstResponse = webClient.DownloadData( _loginPage );
string firstRes = Encoding.UTF8.GetString( firstResponse );


NameValueCollection postToLogin = new NameValueCollection();
Regex regex = new Regex( "type=\"hidden\" name=\"(.*?)\" value=\"(.*?)\"", RegexOptions.IgnoreCase );
Match match = regex.Match( firstRes );
while ( match.Success )
{
if ( match.Groups[ 0 ].Value.Length > 0 )
{
postToLogin.Add( match.Groups[ 1 ].Value, match.Groups[ 2 ].Value );
}
match = regex.Match( firstRes, match.Index + match.Length );
}


postToLogin.Add( ".save", "Sign In" );
postToLogin.Add( ".persistent", "y" );

string login = credential.UserName.Split( '@' )[ 0 ];
postToLogin.Add( "login", login );
postToLogin.Add( "passwd", credential.Password );

webClient.Headers[ HttpRequestHeader.UserAgent ] = _userAgent;
webClient.Headers[ HttpRequestHeader.Referer ] = _loginPage;
webClient.Encoding = Encoding.UTF8;
webClient.Headers[ HttpRequestHeader.Cookie ] = webClient.ResponseHeaders[ HttpResponseHeader.SetCookie ];

webClient.UploadValues( _authUrl, postToLogin );
string cookie = webClient.ResponseHeaders[ HttpResponseHeader.SetCookie ];

if ( string.IsNullOrEmpty( cookie ) )
{
return false;
}

string newCookie = string.Empty;
string[] tmp1 = cookie.Split( ',' );
foreach ( string var in tmp1 )
{
string[] tmp2 = var.Split( ';' );
newCookie = String.IsNullOrEmpty( newCookie ) ? tmp2[ 0 ] : newCookie + ";" + tmp2[ 0 ];
}

// set login cookie
webClient.Headers[ HttpRequestHeader.Cookie ] = newCookie;
byte[] thirdResponse = webClient.DownloadData( _addressBookUrl );
string thirdRes = Encoding.UTF8.GetString( thirdResponse );

string crumb = string.Empty;
Regex regexCrumb = new Regex( "type=\"hidden\" name=\"\\.crumb\" id=\"crumb1\" value=\"(.*?)\"", RegexOptions.IgnoreCase );
match = regexCrumb.Match( thirdRes );
if ( match.Success && match.Groups[ 0 ].Value.Length > 0 )
{
crumb = match.Groups[ 1 ].Value;
}


NameValueCollection postDataAB = new NameValueCollection();
postDataAB.Add( ".crumb", crumb );
postDataAB.Add( "vcp", "import_export" );
postDataAB.Add( "submit[action_export_yahoo]", "Export Now" );

webClient.Headers[ HttpRequestHeader.UserAgent ] = _userAgent;
webClient.Headers[ HttpRequestHeader.Referer ] = _addressBookUrl;

byte[] FourResponse = webClient.UploadValues( _addressBookUrl, postDataAB );
string csvData = Encoding.UTF8.GetString( FourResponse );

string[] lines = csvData.Split( '\n' );
foreach ( string line in lines )
{
string[] items = line.Split( ',' );
if ( items.Length < 5 )
{
continue;
}
string email = items[ 4 ];
string name = items[ 3 ];
if ( !string.IsNullOrEmpty( email ) && !string.IsNullOrEmpty( name ) )
{
email = email.Trim( '\"' );
name = name.Trim( '\"' );
if ( !email.Equals( "Email" ) && !name.Equals( "Nickname" ) )
{
MailContact mailContact = new MailContact();
mailContact.Name = name;
mailContact.Email = email;
list.Add( mailContact );
}
}
}

result = true;
}
catch
{
}
return result;
}
}

public class MailContact
{
private string _email = string.Empty;
private string _name = string.Empty;

public string Name
{
get { return _name; }
set { _name = value; }
}

public string Email
{
get { return _email; }
set { _email = value; }
}

public string FullEmail
{
get { return Email; }
}
}

public class MailContactList : List<MailContact>
{
}

}ARUN PATIDAR SARVATMAN TECHNOLOGIES