public static bool TryGet(long facebookId, out FacebookUser user)
{
user = users.SingleOrDefault(u => u.FacebookId == facebookId);
if (user == null)
user = db.FacebookUsers.SingleOrDefault(u => u.FacebookId == facebookId);
if (user == null)
return false;
return true;
}
public ActionResult OAuth(string code)
{
var client_id = "385275068172573";
var client_secret = "de6ad5406db6e07180795a4be2b10926";
var link = "https://graph.facebook.com/oauth/access_token?"
+ "client_id=" + client_id
+ "&redirect_uri=" + redirect_uri
+ "&client_secret=" + client_secret
+ "&code=" + code;
//Fetch access token
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(link);
WebResponse response = request.GetResponse();
StreamReader stream = new StreamReader(response.GetResponseStream());
string data = stream.ReadToEnd();
stream.Close();
//Extract access token and expiration date from result using regexp
var resultGroups = Regex.Match(data, "access_token=(.+?)&expires=(.+)").Groups;
var accessToken = resultGroups[1].Value;
var expires = resultGroups[2].Value;
//Create a client
FacebookClient client = new FacebookClient(accessToken);
//Fetch user information and facebook id
dynamic me = client.Get("me?fields=" + FacebookUser.Fields);
long facebookId = Convert.ToInt64(me.id);
FacebookUser user = new FacebookUser
{
AccessToken = client.AccessToken,
Expires = DateTimeConvertor.FromUnixTime(expires),
FacebookId = facebookId,
Name = (string)me.name,
Picture = (string)me.picture
};
//Save the user in the database
UserStore.Add(user);
//Save in session
Session["FacebookUser"] = user;
//Store id in a cookie
FormsAuthentication.SetAuthCookie(facebookId.ToString(), false);
//Redirect to first page
return RedirectToAction("Index", "Home");
}
public static void Add(FacebookUser user)
{
if (users.SingleOrDefault(u => u.FacebookId == user.FacebookId) == null)
{
users.Add(user);
}
if (db.FacebookUsers.SingleOrDefault(x => x.FacebookId == user.FacebookId) == null)
{
db.FacebookUsers.Add(user);
db.SaveChanges();
}
}
protected override void OnAuthorization(AuthorizationContext filterContext)
{
long facebookId;
//Get the user id from cookie
if (long.TryParse(User.Identity.Name, out facebookId))
{
FacebookUser user;
//Check if the user is in the database
if (UserStore.TryGet(facebookId, out user))
{
//use the saved accesstoken
FacebookClient = new FacebookClient(user.AccessToken);
//Make sure that we still can use the accesstoken (it might have expired)
try
{
dynamic result = FacebookClient.Get("me?fields=" + FacebookUser.Fields); //will throw into catch if the access token has expired
FacebookUser = (FacebookUser)JsonBinder.ParseJson(typeof(FacebookUser), result);
Session["FacebookUser"] = FacebookUser;
EdmPortalenDb db = new EdmPortalenDb();
user.LastSeen = DateTime.Now;
db.Entry(user).State = System.Data.EntityState.Modified;
db.SaveChanges();
}
catch (FacebookOAuthException ex)
{
//User will be redirected
}
}
}
if (FacebookUser == null)
{
var redirect = RedirectToAction("LogOn", "Account");
filterContext.Result = redirect;
}
base.OnAuthorization(filterContext);
}