How to Authenticate Users With Facebook Connect?

Question

I had strange thing as when I click on Facebook tab to play my Game the authentication message didn't appeared but I must copy the Game URL that I put the Game on our server and the authentication message appeared and can authenticate then when I click on Facebook tab it work well . So what is the wrong ?

Facebook_login page

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        string host = System.Configuration.ConfigurationManager.AppSettings["host"];
        string facebookClientId =
          System.Configuration.ConfigurationManager.AppSettings["FacebookClientId"];
        string RedirectURL = "http://facebookapp.elarabygroup.com";
        if (Request.QueryString["redirectURL"] != null)
        {
            RedirectURL = Request.QueryString["redirectURL"].ToString();
            Session["RedirectURL"] = RedirectURL;
        }
        Response.Redirect(@"https://graph.facebook.com/oauth/authorize?client_id=" +
          facebookClientId + "&redirect_uri=http://" + host +
          @"/FBcallback.aspx&scope=publish_stream,offline_access,publish_actions");
    }
}

FBcallback page

protected void Page_Load(object sender, EventArgs e)
{

    if (Request.QueryString["code"] != null)
    {

        string facebookClientId = System.Configuration.ConfigurationManager.AppSettings["FacebookClientId"];
        string facebookSecret = System.Configuration.ConfigurationManager.AppSettings["FacebookSecret"];
        string host = System.Configuration.ConfigurationManager.AppSettings["host"];
        string code = Request.QueryString["code"];

        var url = 
            string.Concat("https://graph.facebook.com/oauth/access_token?client_id=" + facebookClientId,"&redirect_uri=http://" + host + "/admin/facebook/auth.aspx","&client_secret=" + facebookSecret,"&code=" + code);

        oAuthFacebooks fbAC = new oAuthFacebooks();
        string respnse = "";
        try
        {
            fbAC.AccessTokenGet(code);
            respnse = fbAC.Token;
        }
        catch (Exception ex)
        {
            Response.Redirect("http://x/SiteLogin.aspx?error=" + ex.Message);
        }

        if (Session["RedirectURL"] != null && Session["RedirectURL"].ToString() != "")
        {
            Response.Redirect(Session["RedirectURL"].ToString() + "?token=" + respnse + "&source=FB");
        }
        else
        {
            Response.Redirect("http://x/SiteLogin.aspx?token=" + respnse);
        }

    }
    else
    {
        Response.Redirect("http://x/SiteLogin.aspx?error=code not found" +
                       Request.QueryString["error_reason"].ToString());
    }

}

sitelogin page

if (Request.QueryString["token"] != null)
    {
        string token = Request.QueryString["token"];

        string PostURL = string.Format("https://graph.facebook.com/me?access_token={0}", token);
        oAuthFacebooks objFbCall = new oAuthFacebooks();
        string JSONInfo = objFbCall.WebRequest(oAuthFacebooks.Method.GET, PostURL, "");

        JObject Job = JObject.Parse(JSONInfo);
        JToken Jdata = Job.Root;

        //added from other soluation
       // string code = Request.QueryString["code"];

        if (Jdata.HasValues)
        {
            //added from other soluation
            /*string data = FaceBookConnect.Fetch(code, "me");
            FaceBookUser faceBookUser = new JavaScriptSerializer().Deserialize<FaceBookUser>(data);*/

            string UID = (string)Jdata.SelectToken("id");
            string firstname = (string)Jdata.SelectToken("first_name");
            string lastname = (string)Jdata.SelectToken("last_name");

            string pic = string.Format("https://graph.facebook.com/{0}/picture", UID);


            string username = firstname + " " + lastname;

           userdata.Attributes.Add("Value", "fb_id="+UID+ "&fb_name="+username+"&fb_img=" + pic);
           userdata2.Attributes.Add("Value", "fb_id=" + UID + "&fb_name=" + username + "&fb_img=" + pic);


        }

    }
    else

    { Response.Write(" xx"); }
}

Answer 1

Actually the question wasnt very clear.. I am taking a shot in the dark.

Here is how the facebook login flow..

• connected. The person is logged into Facebook, and has logged into your app.
  (*I think this is your case when you goto to your app from facebook tab. Whenever a user take any app through facebook they are automatically connected else if a user is logged into fb and a user take your app from another browser tab. You wont be connected but will be in a state of not_authorised described below. if a user is not authorised he will need to login again for your app*)

• not_authorized. The person is logged into Facebook, but has not logged into your app.
  (I think this is your case when you goto your app through the url you specify in browser and not through facebook tab)

• unknown. The person is not logged into Facebook, so you don't know if they've logged into your app.

Here is a the documentation for more details...

PS: Make sure that the URLs specified on that image is exactly the same as on your application.