C# Persistent WebClient
- by Nullstr1ng
I have a class written in C# (Windows Forms)
It's a WebClient class which I intent to use in some website and for Logging In and navigation.
Here's the complete class pastebin.com (the class has 197 lines so I just use pastebin. Sorry if I made a little bit harder for you to read the class, also below this post)
The problem is, am not sure why it's not persistent .. I was able to log in, but when I navigate to other page (without leaving the domain), I was thrown back to log in page.
Can you help me solving this problem?
one issue though is, the site I was trying to connect is "HTTPS" protocol. I have not yet tested this on just a regular HTTP.
Thank you in advance.
/*
* Web Client v1.2
* ---------------
* Date: 12/17/2010
* author: Jayson Ragasa
*/
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Net;
using System.Web;
namespace Nullstring.Modules.WebClient
{
public class WebClientLibrary
{
#region vars
string _method = string.Empty;
ArrayList _params;
CookieContainer cookieko;
HttpWebRequest req = null;
HttpWebResponse resp = null;
Uri uri = null;
#endregion
#region properties
public string Method
{
set { _method = value; }
}
#endregion
#region constructor
public WebClientLibrary()
{
_method = "GET";
_params = new ArrayList();
cookieko = new CookieContainer();
}
#endregion
#region methods
public void ClearParameter()
{
_params.Clear();
}
public void AddParameter(string key, string value)
{
_params.Add(string.Format("{0}={1}", WebTools.URLEncodeString(key), WebTools.URLEncodeString(value)));
}
public string GetResponse(string URL)
{
StringBuilder response = new StringBuilder();
#region create web request
{
uri = new Uri(URL);
req = (HttpWebRequest)WebRequest.Create(URL);
req.Method = "GET";
req.GetLifetimeService();
}
#endregion
#region get web response
{
resp = (HttpWebResponse)req.GetResponse();
Stream resStream = resp.GetResponseStream();
int bytesReceived = 0;
string tempString = null;
int count = 0;
byte[] buf = new byte[8192];
do
{
count = resStream.Read(buf, 0, buf.Length);
if (count != 0)
{
bytesReceived += count;
tempString = Encoding.UTF8.GetString(buf, 0, count);
response.Append(tempString);
}
}
while (count > 0);
}
#endregion
return response.ToString();
}
public string GetResponse(string URL, bool HasParams)
{
StringBuilder response = new StringBuilder();
#region create web request
{
uri = new Uri(URL);
req = (HttpWebRequest)WebRequest.Create(URL);
req.MaximumAutomaticRedirections = 20;
req.AllowAutoRedirect = true;
req.Method = this._method;
req.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
req.KeepAlive = true;
req.CookieContainer = this.cookieko;
req.UserAgent = "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_5_8; en-US) AppleWebKit/534.10 (KHTML, like Gecko) Chrome/8.0.552.224 Safari/534.10";
}
#endregion
#region build post data
{
if (HasParams)
{
if (this._method.ToUpper() == "POST")
{
string Parameters = String.Join("&", (String[])this._params.ToArray(typeof(string)));
UTF8Encoding encoding = new UTF8Encoding();
byte[] loginDataBytes = encoding.GetBytes(Parameters);
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = loginDataBytes.Length;
Stream stream = req.GetRequestStream();
stream.Write(loginDataBytes, 0, loginDataBytes.Length);
stream.Close();
}
}
}
#endregion
#region get web response
{
resp = (HttpWebResponse)req.GetResponse();
Stream resStream = resp.GetResponseStream();
int bytesReceived = 0;
string tempString = null;
int count = 0;
byte[] buf = new byte[8192];
do
{
count = resStream.Read(buf, 0, buf.Length);
if (count != 0)
{
bytesReceived += count;
tempString = Encoding.UTF8.GetString(buf, 0, count);
response.Append(tempString);
}
}
while (count > 0);
}
#endregion
return response.ToString();
}
#endregion
}
public class WebTools
{
public static string EncodeString(string str)
{
return HttpUtility.HtmlEncode(str);
}
public static string DecodeString(string str)
{
return HttpUtility.HtmlDecode(str);
}
public static string URLEncodeString(string str)
{
return HttpUtility.UrlEncode(str);
}
public static string URLDecodeString(string str)
{
return HttpUtility.UrlDecode(str);
}
}
}
UPDATE Dec 22GetResponse overload
public string GetResponse(string URL)
{
StringBuilder response = new StringBuilder();
#region create web request
{
//uri = new Uri(URL);
req = (HttpWebRequest)WebRequest.Create(URL);
req.Method = "GET";
req.CookieContainer = this.cookieko;
}
#endregion
#region get web response
{
resp = (HttpWebResponse)req.GetResponse();
Stream resStream = resp.GetResponseStream();
int bytesReceived = 0;
string tempString = null;
int count = 0;
byte[] buf = new byte[8192];
do
{
count = resStream.Read(buf, 0, buf.Length);
if (count != 0)
{
bytesReceived += count;
tempString = Encoding.UTF8.GetString(buf, 0, count);
response.Append(tempString);
}
}
while (count 0);
}
#endregion
return response.ToString();
}
But still I got thrown back to login page.
UPDATE: Dec 23
I tried listing the cookie and here's what I get
at first, I have to login to a webform and this I have this Cookie
JSESSIONID=368C0AC47305282CBCE7A566567D2942
then I navigated to another page (but on the same domain) I got a different Cooke?
JSESSIONID=9FA2D64DA7669155B9120790B40A592C
What went wrong? I use the code updated last Dec 22
