public bool AuthenticateForSignUp(System.Web.HttpContext context, out Me me, out string accessToken)
{
me = null;
accessToken = "";
string code = context.Request.QueryString["code"];
string url;
WebClient webClient = new WebClient();
// If this is a return of a Facebook result then check is an error has orrured
string log = "";
if (context.Request.QueryString["error_reason"] != null) log += "error_reason" + context.Request.QueryString["error_reason"] + ";";
if (context.Request.QueryString["error"] != null) log += "error" + context.Request.QueryString["error"] + ";";
if (context.Request.QueryString["error_description"] != null) log += "error_description" + context.Request.QueryString["error_description"] + ";";
if (!String.IsNullOrEmpty(log))
{
Exception exception = new Exception(log);
Logger.Instance.Write(LogLevel.Error, exception, log);
throw exception;
}
// No code given means initialize Facebook authentication. Redirect this page to Facebook with neccesery parameters
if (String.IsNullOrEmpty(code))
{
url = FACEBOOK_OAUTH_DIALOG;
url += "?client_id=" + ConfigurationManager.AppSettings["Facebook.App.Id"]; //GetConfiguration("facebook.app_id");
url += "&redirect_uri=" + HttpUtility.UrlEncode(context.Request.Url.AbsoluteUri);
url += "&scope=email,publish_stream,manage_pages";
url += "&state=" + context.Session.SessionID;
context.Response.Redirect(url, true);
//return;
}
// When code is given then Facebook authentication went without errors.
if (context.Session.SessionID == context.Request.QueryString["state"])
{
url = FACEBOOK_OAUTH_ACCESS;
url += "?client_id=" + ConfigurationManager.AppSettings["Facebook.App.Id"]; //GetConfiguration("facebook.app_id");
url += "&redirect_uri=" + HttpUtility.UrlEncode(context.Request.Url.AbsoluteUri.Replace(context.Request.Url.Query, ""));
url += "&client_secret=" + ConfigurationManager.AppSettings["Facebook.App.Secret"]; //GetConfiguration("facebook.app_secret");
url += "&code=" + code;
string oAuthAccessResult = webClient.DownloadString(url);
Logger.Instance.Write(LogLevel.Debug, "Facebook authentication result: " + oAuthAccessResult, oAuthAccessResult);
DateTime expires = DateTime.Now.AddMinutes(1);
int expiresIndex = oAuthAccessResult.IndexOf("&expires=");
if (expiresIndex == -1)
{
expiresIndex = oAuthAccessResult.Length;
}
else
{
string expiresStr = oAuthAccessResult.Substring(expiresIndex + 9, oAuthAccessResult.Length - expiresIndex - 9);
int expiresInSec = int.Parse(expiresStr);
expires = DateTime.Now.AddSeconds(expiresInSec);
}
accessToken = oAuthAccessResult.Substring(oAuthAccessResult.IndexOf("access_token=") + 13, expiresIndex - 13);
me = GetMe(accessToken);
if (me == null)
{
Logger.Instance.Write(LogLevel.Error, "Cannot verify the Facebook account", new object[] { accessToken });
throw new Exception("Cannot verify the Facebook account");
}
var _client = new FacebookClient(accessToken);
dynamic _me = _client.Get("me");
firstName = _me.first_name;
lastName = _me.last_name;
email = _me.email;
using (Database db = new MySqlDatabase())
{
isEmailExist = db.isEmailAlreadyRegistered(email);
}
if (string.IsNullOrEmpty(email) || isEmailExist == true)
return false;
//fbAuthentication.Persist(me, accessToken, expires);
}
return true;
}