Develop Reference

WebClient login failure

My Code:
class MyWebClient : WebClient
{
private CookieContainer _cookieContainer = new CookieContainer();
protected override WebRequest GetWebRequest(Uri address)
{
WebRequest request = base.GetWebRequest(address);
if (request is HttpWebRequest)
{
(request as HttpWebRequest).CookieContainer = _cookieContainer;
}
return request;
}
}
using (var client = new MyWebClient())
{
var data = new NameValueCollection
{
{ "username", "myUser" },
{ "password", "myPw" }
};
client.UploadValues("http://www..tv/takelogin.php", data);
}
MNM3.4:
Response:
Building my app i use 3 sites.. with 2 of them everything works fine but with this no.

Passing a CookieContainer usually does the trick but you're already sending it. Can you confirm the field names?
Also, for some websites, you'll need to post back the hidden fields. I usually perform a GET to the login page and, using an HTML parser (like HtmlAgilityPack), I locate the appropriate form and POST the login request with all INPUT/SELECT fields I find.
I think the best advice here is to use a debugging proxy like Fiddler and try to perform the login from the browser and inspect the generated traffic.

I Found the problem...
client.UploadValues("http://www..tv/takelogin.php", data);
changed to:
client.UploadValues("http://.tv/takelogin.php", data);
That means:
http://www.MY_SITE.tv
dont work, but
http://MY_SITE.tv
works fine.

Using Cookie aware WebClient

I'm using this enhanced version of WebClient to login in a site:
public class CookieAwareWebClient : WebClient
{
public CookieAwareWebClient()
{
CookieContainer = new CookieContainer();
}
public CookieContainer CookieContainer { get; private set; }
protected override WebRequest GetWebRequest(Uri address)
{
var request = (HttpWebRequest)base.GetWebRequest(address);
request.CookieContainer = CookieContainer;
return request;
}
}
And this way I send cookie to the site:
using (var client = new CookieAwareWebClient())
{
var values = new NameValueCollection
{
{ "username", "john" },
{ "password", "secret" },
};
client.UploadValues("http://example.com//dl27929", values);
// If the previous call succeeded we now have a valid authentication cookie
// so we could download the protected page
string result = client.DownloadString("http://domain.loc/testpage.aspx");
}
But when I run my program and capture the traffic in Fiddler I get 302 status code. I tested the request in Fiddler this way and everything is OK and I get the status code of 200.
The request in the Fiddler:
GET http://example.com//dl27929 HTTP/1.1
Cookie: username=john; password=secret;
Host: domain.loc
And here is the request sending by the application:
POST http://example.com//dl27929 HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Host: www.domain.loc
Content-Length: 75
Expect: 100-continue
Connection: Keep-Alive
As you can see it doesn't send the cookie.
Any idea?

Everything works fine, just I forgot to set the cookie, Thanks Scott:
client.CookieContainer.SetCookies(new Uri("http://example.com//dl27929"), "username=john; password=secret;");

How to get cookie and recover it to next request?

My question is how can I do POST request, next get cookie from that request and set it to the next request for example GET type in C#? Please for example code.
I had tried a lot of times, for example by CookieAwareWebClient method but it not working:
public class CookieAwareWebClient : WebClient
{
public CookieContainer CookieContainer { get; set; }
public CookieAwareWebClient()
: base()
{
CookieContainer = new CookieContainer();
}
protected override WebRequest GetWebRequest(Uri address)
{
WebRequest request = base.GetWebRequest(address);
HttpWebRequest webRequest = request as HttpWebRequest;
if (webRequest != null)
{
webRequest.CookieContainer = CookieContainer;
}
return request;
}
}
What I need? I need to login by POST requests and next do for example 10-20 request POST/GET by the authenticate cookie from first request (login)
I'm doing it by this:
//Create an instance of your new CookieAware Web Client
using (var client = new CookieAwareWebClient())
{
//Authenticate (username and password can be either hard-coded or pulled from a settings area)
var values = new NameValueCollection{{ "UserName", username },{ "Password", password }};
client.UploadValues(new Uri("http://www.yourdomain.com/Account/LogOn/"), "POST", values);
client.UploadString(new Uri("http://www.yourdomain.com/Secure/YourSecureMethod"),
"POST", "Example Message");
}
But I cant set this cookie to my next requests (next reauest creating thier own NEW non-authenticated cookies)

Log in to Drupal site via C# application

I want to log in to my Drupal site via a C# application and have been using OAuth and Services with no success. Is there a way to log in with a session from C#? I need to do this to access my private files on my Drupal site.
I tried to use the code below from a user here on stackoverflow with now success. I get 403 when using the code.
public class CookieAwareWebClient : WebClient
{
private CookieContainer cookie = new CookieContainer();
protected override WebRequest GetWebRequest(Uri address)
{
WebRequest request = base.GetWebRequest(address);
if (request is HttpWebRequest)
{
(request as HttpWebRequest).CookieContainer = cookie;
}
return request;
}
}
var client = new CookieAwareWebClient();
client.BaseAddress = #"https://www.mysite.com/";
var loginData = new NameValueCollection();
loginData.Add("login", user);
loginData.Add("password", password);
client.UploadValues("login.php", "POST", loginData); // ERROR HERE
//Now you are logged in and can request pages
string htmlSource = client.DownloadString("index.php");

There is no login.php in drupal. I think you need to check these examples: (RPC / Services 3)
https://drupal.org/node/308629
http://www.technogumbo.com/2012/05/Drupal-7-Services-3-REST-Server-C-Sharp-Example/

Problems authenticating to website from code

I am trying to write code that will authenticate to the website wallbase.cc. I've looked at what it does using Firfebug/Chrome Developer tools and it seems fairly easy:
Post "usrname=$USER&pass=$PASS&nopass_email=Type+in+your+e-mail+and+press+enter&nopass=0" to the webpage "http://wallbase.cc/user/login", store the returned cookies and use them on all future requests.
Here is my code:
private CookieContainer _cookies = new CookieContainer();
//......
HttpPost("http://wallbase.cc/user/login", string.Format("usrname={0}&pass={1}&nopass_email=Type+in+your+e-mail+and+press+enter&nopass=0", Username, assword));
//......
private string HttpPost(string url, string parameters)
{
try
{
System.Net.WebRequest req = System.Net.WebRequest.Create(url);
//Add these, as we're doing a POST
req.ContentType = "application/x-www-form-urlencoded";
req.Method = "POST";
((HttpWebRequest)req).Referer = "http://wallbase.cc/home/";
((HttpWebRequest)req).CookieContainer = _cookies;
//We need to count how many bytes we're sending. Post'ed Faked Forms should be name=value&
byte[] bytes = System.Text.Encoding.ASCII.GetBytes(parameters);
req.ContentLength = bytes.Length;
System.IO.Stream os = req.GetRequestStream();
os.Write(bytes, 0, bytes.Length); //Push it out there
os.Close();
//get response
using (System.Net.WebResponse resp = req.GetResponse())
{
if (resp == null) return null;
using (Stream st = resp.GetResponseStream())
{
System.IO.StreamReader sr = new System.IO.StreamReader(st);
return sr.ReadToEnd().Trim();
}
}
}
catch (Exception)
{
return null;
}
}
After calling HttpPost with my login parameters I would expect all future calls using this same method to be authenticated (assuming a valid username/password). I do get a session cookie in my cookie collection but for some reason I'm not authenticated. I get a session cookie in my cookie collection regardless of which page I visit so I tried loading the home page first to get the initial session cookie and then logging in but there was no change.
To my knowledge this Python version works: https://github.com/sevensins/Wallbase-Downloader/blob/master/wallbase.sh (line 336)
Any ideas on how to get authentication working?
Update #1
When using a correct user/password pair the response automatically redirects to the referrer but when an incorrect user/pass pair is received it does not redirect and returns a bad user/pass pair. Based on this it seems as though authentication is happening, but maybe not all the key pieces of information are being saved??
Update #2
I am using .NET 3.5. When I tried the above code in .NET 4, with the added line of System.Net.ServicePointManager.Expect100Continue = false (which was in my code, just not shown here) it works, no changes necessary. The problem seems to stem directly from some pre-.Net 4 issue.

This is based on code from one of my projects, as well as code found from various answers here on stackoverflow.
First we need to set up a Cookie aware WebClient that is going to use HTML 1.0.
public class CookieAwareWebClient : WebClient
{
private CookieContainer cookie = new CookieContainer();
protected override WebRequest GetWebRequest(Uri address)
{
HttpWebRequest request = (HttpWebRequest)base.GetWebRequest(address);
request.ProtocolVersion = HttpVersion.Version10;
if (request is HttpWebRequest)
{
(request as HttpWebRequest).CookieContainer = cookie;
}
return request;
}
}
Next we set up the code that handles the Authentication and then finally loads the response.
var client = new CookieAwareWebClient();
client.UseDefaultCredentials = true;
client.BaseAddress = #"http://wallbase.cc";
var loginData = new NameValueCollection();
loginData.Add("usrname", "test");
loginData.Add("pass", "123");
loginData.Add("nopass_email", "Type in your e-mail and press enter");
loginData.Add("nopass", "0");
var result = client.UploadValues(#"http://wallbase.cc/user/login", "POST", loginData);
string response = System.Text.Encoding.UTF8.GetString(result);
We can try this out using the HTML Visualizer inbuilt into Visual Studio while staying in debug mode and use that to confirm that we were able to authenticate and load the Home page while staying authenticated.
The key here is to set up a CookieContainer and use HTTP 1.0, instead of 1.1. I am not entirely sure why forcing it to use 1.0 allows you to authenticate and load the page successfully, but part of the solution is based on this answer.
https://stackoverflow.com/a/10916014/408182
I used Fiddler to make sure that the response sent by the C# Client was the same as with my web browser Chrome. It also allows me to confirm if the C# client is being redirect correctly. In this case we can see that with HTML 1.0 we are getting the HTTP/1.0 302 Found and then redirects us to the home page as intended. If we switch back to HTML 1.1 we will get an HTTP/1.1 417 Expectation Failed message instead.
There is some information on this error message available in this stackoverflow thread.
HTTP POST Returns Error: 417 "Expectation Failed."
Edit: Hack/Fix for .NET 3.5
I have spent a lot of time trying to figure out the difference between 3.5 and 4.0, but I seriously have no clue. It looks like 3.5 is creating a new cookie after the authentication and the only way I found around this was to authenticate the user twice.
I also had to make some changes on the WebClient based on information from this post.
http://dot-net-expertise.blogspot.fr/2009/10/cookiecontainer-domain-handling-bug-fix.html
public class CookieAwareWebClient : WebClient
{
public CookieContainer cookies = new CookieContainer();
protected override WebRequest GetWebRequest(Uri address)
{
var request = base.GetWebRequest(address);
var httpRequest = request as HttpWebRequest;
if (httpRequest != null)
{
httpRequest.ProtocolVersion = HttpVersion.Version10;
httpRequest.CookieContainer = cookies;
var table = (Hashtable)cookies.GetType().InvokeMember("m_domainTable", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.GetField | System.Reflection.BindingFlags.Instance, null, cookies, new object[] { });
var keys = new ArrayList(table.Keys);
foreach (var key in keys)
{
var newKey = (key as string).Substring(1);
table[newKey] = table[key];
}
}
return request;
}
}
var client = new CookieAwareWebClient();
var loginData = new NameValueCollection();
loginData.Add("usrname", "test");
loginData.Add("pass", "123");
loginData.Add("nopass_email", "Type in your e-mail and press enter");
loginData.Add("nopass", "0");
// Hack: Authenticate the user twice!
client.UploadValues(#"http://wallbase.cc/user/login", "POST", loginData);
var result = client.UploadValues(#"http://wallbase.cc/user/login", "POST", loginData);
string response = System.Text.Encoding.UTF8.GetString(result);

You may need to add the following:
//get response
using (System.Net.WebResponse resp = req.GetResponse())
{
foreach (Cookie c in resp.Cookies)
_cookies.Add(c);
// Do other stuff with response....
}
Another thing that you might have to do is, if the server responds with a 302 (redirect) the .Net web request will automatically follow it and in the process you might lose the cookie you're after. You can turn off this behavior with the following code:
req.AllowAutoRedirect = false;

The Python you reference uses a different referrer (http://wallbase.cc/start/). It is also followed by another post to (http://wallbase.cc/user/adult_confirm/1). Try the other referrer and followup with this POST.
I think you are authenticating correctly, but that the site needs more info/assertions from you before proceeding.