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POIntegrating Facebook chat
 

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  1. POIntegrating Facebook chat
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    <p>I have written a program to integrate Facebook user chat in C#, however I always get <code>&lt;failure xmlns="urn:ietf:params:xml:ns:xmpp-sasl"&gt;&lt;not-authorized/&gt;&lt;/failure&gt;</code> after sending the response to the server.</p> <p>I've checked the API key and the App secret, both of them are correct. It looks like I'm passing some wrong parameters to the server.</p> <p>Here is my code.</p> <pre><code>private void GetDetailsButton_Click(object sender, EventArgs e) { TcpClient FacebookClient = new TcpClient(); FacebookClient.Connect("chat.facebook.com", 5222); NetworkStream myns = FacebookClient.GetStream(); string xml = "&lt;?xml version='1.0'?&gt;" + "&lt;stream:stream " + "id='1' " + "to='chat.facebook.com' " + "xmlns='jabber:client' " + "xmlns:stream='http://etherx.jabber.org/streams' " + "version='1.0' &gt;"; StreamWriter mySw = new StreamWriter(myns); mySw.WriteLine(xml); //sending initial request mySw.Flush(); byte[] serverResponseByte = new byte[1024]; int myBytesRead = 0; StringBuilder myResponseAsSB = new StringBuilder(); //reading response from the server to see the supported authentication methods do { myBytesRead = myns.Read(serverResponseByte, 0, serverResponseByte.Length); myResponseAsSB.Append(System.Text.Encoding.UTF8.GetString(serverResponseByte, 0, myBytesRead)); } while (myns.DataAvailable); myResponseAsSB.Clear(); xml = "&lt;auth " + "xmlns='urn:ietf:params:xml:ns:xmpp-sasl' " + "mechanism='X-FACEBOOK-PLATFORM' /&gt;"; mySw.WriteLine(xml); mySw.Flush(); //sending response to server to use X-FACEBOOK-PLATFORM //reading challenge send by the server do { myBytesRead = myns.Read(serverResponseByte, 0, serverResponseByte.Length); myResponseAsSB.Append(System.Text.Encoding.UTF8.GetString(serverResponseByte, 0, myBytesRead)); } while (myns.DataAvailable); myResponseAsSB.Replace("&lt;challenge xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"&gt;", ""); myResponseAsSB.Replace("&lt;/challenge&gt;", ""); //converting challenge string to normal string byte[] myregularstrigbytes = Convert.FromBase64String(myResponseAsSB.ToString()); string myregularstring = System.Text.Encoding.UTF8.GetString(myregularstrigbytes); //I've hardcoded the accesstoken here for testing purpose. string SessionKey = AccessToken.Split('|')[1]; string response = ComposeResponse(myregularstring); byte[] myResponseByte = Encoding.UTF8.GetBytes(response.ToString()); string myEncodedResponseToSend = Convert.ToBase64String(myResponseByte); xml = String.Format("&lt;response xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"&gt;{0}&lt;/response&gt;", myEncodedResponseToSend); mySw.WriteLine(xml); mySw.Flush(); //sending the response to the server with my parameters myResponseAsSB.Clear(); //checking if authentication succeed do { myBytesRead = myns.Read(serverResponseByte, 0, serverResponseByte.Length); myResponseAsSB.Append(System.Text.Encoding.UTF8.GetString(serverResponseByte, 0, myBytesRead)); } while (myns.DataAvailable); MessageBox.Show(myResponseAsSB.ToString()); } private string ComposeResponse(string serverresponse) { string version = serverresponse.Split('&amp;')[0].Split('=')[1]; string method = serverresponse.Split('&amp;')[1].Split('=')[1]; string nonce = serverresponse.Split('&amp;')[2].Split('=')[1]; string SessionKey = AccessToken.Split('|')[1]; long callId = (long)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalSeconds; string sig = "api_key=" + appId + "call_id=" + callId + "method=" + method + "nonce=" + nonce + "session_key=" + SessionKey + "v=" + "1.0" + AppSecret; MD5 md = MD5.Create(); var hash = md.ComputeHash(Encoding.UTF8.GetBytes(sig)); sig = hash.Aggregate("", (current, b) =&gt; current + b.ToString("x2")); return "api_key=" + HttpUtility.UrlEncode(appId) + "&amp;call_id=" + HttpUtility.UrlEncode(callId) + "&amp;method=" + HttpUtility.UrlEncode(method) + "&amp;nonce=" + HttpUtility.UrlEncode(nonce) + "&amp;session_key=" + HttpUtility.UrlEncode(SessionKey) + "&amp;v=" + HttpUtility.UrlEncode("1.0") + "&amp;sig=" + HttpUtility.UrlEncode(sig); } </code></pre> <p>I've refereed to this articles <a href="http://www.ianquigley.com/A91_Facebook_Chat_Authentication_in_C.html" rel="nofollow noreferrer">Facebook Chat Authentication in C#</a> and <a href="http://aspnetpk.wikispaces.com/X-FACEBOOK-PLATFORM" rel="nofollow noreferrer">X-FACEBOOK-PLATFORM</a> and my application type is of Native/Desktop.</p> <p>Can some point me in the right direction?</p> <p><strong>Edit :</strong> I think the problem is while creating the signature, is there any way to verify the created signature?</p> <p><strong>Edit 1 :</strong> According to this <a href="https://stackoverflow.com/questions/3709505/facebook-chat-x-facebook-platform-authentication/4614905#4614905">SO answer</a> the access token contains the session key after the first | character and I could find the | character till 2 days ago, but now I can't find the | character in the access token, its really strange, so how do I find the session key now? (Or may be I should go to sleep now.)</p> <p><strong>Edit 2 :</strong> Its strange that I always got the access token in form of <code>&lt;appId&gt;|&lt;sessionKey&gt;|&lt;digest&gt;</code> for native/desktop application. I did further searching and found out that the session key needs to be extracted from <a href="http://developers.facebook.com/docs/reference/rest/auth.promoteSession/" rel="nofollow noreferrer">auth.promoteSession</a> legacy api and encode the parameters using <code>HttpUtility.UrlEncode</code> instead of <code>HttpUtility.HtmlEncode</code>. </p> <p>Now I've hard coded the Access token (verified it in the <a href="https://developers.facebook.com/tools/debug" rel="nofollow noreferrer">Access Token Debugger</a>), the session key, App key and app secret still I get the same error <code>&lt;failure xmlns="urn:ietf:params:xml:ns:xmpp-sasl"&gt;&lt;not-authorized/&gt;&lt;/failure&gt;</code> </p> <p><strong>Edit 3 :</strong> I have been banging my head over a week and still this doesn't work, but today I found a update in the <a href="http://developers.facebook.com/docs/chat/" rel="nofollow noreferrer">documentation</a> which says <code>Note that this needs to be over TLS (Transport Layer Security) or you'll get an error.</code> I guess I need to modify my code accordingly.</p> <p><strong>Edit 4 :</strong> I've tried out the code in the documentation and found that the value of <code>$SESSION_XML</code> should be</p> <pre><code>$SESSION_XML = '&lt;iq type="set" id="4"&gt;'. '&lt;session xmlns="urn:ietf:params:xml:ns:xmpp-session"/&gt;&lt;/iq&gt;'; </code></pre> <p>I will post the C# code once I finish converting it.</p>
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    1. COOH... it's funny that you're getting <not-authorized/> ... because this is the error I'm currently getting for some weird reason. thanks for the link to my blog! :)
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      1. USIan Quigley
    2. COHas the user granted your application the `xmpp_login` [extended permission](https://developers.facebook.com/docs/reference/api/permissions/)?
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      1. USCasey Chu
    3. COAlso, are you sure your hardcoded access token isn't expired?
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