protected override void OnElementChanged(ElementChangedEventArgs <Page> e)
{
base.OnElementChanged(e);
var activity = this.Context as Activity;
if (!isShown && (Element != null))
{
isShown = true;
FacebookLogin facebookLogin = (FacebookLogin)Element;
var auth = new OAuth2Authenticator(
clientId: facebookLogin.FacebookSettings.ClientId,
scope: facebookLogin.FacebookSettings.Scope,
authorizeUrl: new Uri(facebookLogin.FacebookSettings.AuthorizeUrl),
redirectUrl: new Uri(facebookLogin.FacebookSettings.RedirectUrl));
auth.Completed += async(sender, eventArgs) =>
{
string id = string.Empty, token = String.Empty;
if (eventArgs.IsAuthenticated)
{
token = eventArgs.Account.Properties["access_token"];
var request = new OAuth2Request("GET", new Uri("https://graph.facebook.com/me?fields=name"), null, eventArgs.Account);
await request.GetResponseAsync().ContinueWith(t =>
{
if (!t.IsFaulted)
{
var response = t.Result.GetResponseStream();
JsonReader reader = new JsonReader(new InputStreamReader(response, "UTF-8"));
reader.BeginObject();
while (reader.HasNext)
{
var name = reader.NextName();
if (name.Equals("id"))
{
id = reader.NextString();
break;
}
else
{
reader.SkipValue();
}
}
reader.EndObject();
}
});
}
facebookLogin.LoginCompleted(eventArgs.IsAuthenticated, id, token);
};
activity.StartActivity(auth.GetUI(activity));
}
}
public override async void ViewDidAppear(bool animated)
{
base.ViewDidAppear(animated);
if (!isShown && (Element != null))
{
isShown = true;
FacebookLogin facebookLogin = (FacebookLogin)Element;
#if USE_NATIVE_FACEBOOK_LOGIN
try
{
var signedIn = verifyFacebookFromSerttings();
if (string.IsNullOrEmpty(signedIn.Item1) || string.IsNullOrEmpty(signedIn.Item2))
{
LoginManager manager = new LoginManager()
{
LoginBehavior = LoginBehavior.Native
};
manager.Init();
LoginManagerLoginResult result = await manager.LogInWithReadPermissionsAsync(new string[] { "public_profile", "email" }, null);
var id = string.Empty;
var token = string.Empty;
var isAuthenticated = !result.IsCancelled && (result.Token != null);
if (isAuthenticated)
{
token = result.Token.TokenString;
id = result.Token.UserID;
}
facebookLogin.LoginCompleted(isAuthenticated, id, token);
}
else
{
facebookLogin.LoginCompleted(true, signedIn.Item2, signedIn.Item1);
}
}
catch
{
facebookLogin.LoginCompleted(false, string.Empty, string.Empty);
}
#else
var auth = new OAuth2Authenticator(
clientId: facebookLogin.FacebookSettings.ClientId,
scope: facebookLogin.FacebookSettings.Scope,
authorizeUrl: new Uri(facebookLogin.FacebookSettings.AuthorizeUrl),
redirectUrl: new Uri(facebookLogin.FacebookSettings.RedirectUrl));
auth.Completed += async(sender, eventArgs) =>
{
string id = string.Empty, token = String.Empty;
if (eventArgs.IsAuthenticated)
{
token = eventArgs.Account.Properties["access_token"];
var request = new OAuth2Request("GET", new Uri("https://graph.facebook.com/me?fields=name"), null, eventArgs.Account);
await request.GetResponseAsync().ContinueWith(t =>
{
if (!t.IsFaulted)
{
string response = t.Result.GetResponseText();
NSData responseData = NSData.FromString(response, NSStringEncoding.UTF8);
NSError error;
NSDictionary jsonDict = (NSDictionary)NSJsonSerialization.Deserialize(responseData, 0, out error);
if (jsonDict != null)
{
NSObject obj = jsonDict.ValueForKey(new NSString("id"));
id = obj?.ToString();
}
}
});
}
facebookLogin.LoginCompleted(eventArgs.IsAuthenticated, id, token);
};
PresentViewController(auth.GetUI(), true, null);
#endif
}
}