ImplicitGrantAuth loses authentication after a while

I wrote a programm which uses both, web and local api. I just need the webapi to get fulltrack information and got the authentication process to work with ImplicitGrantAuth. After a while though, it won’t work anymore. It seems like the auth expires.

Is there a way to extend the auth? I read on the Spotify API-Doc that there is something called “refresh_token” but I’m not sure if its documented in your library or if it’s even possible to refresh the authentication.

This is the code which connects when a button is clicked.

private async void SpotifyWebConnect()
        {
            WriteConsole("Trying to connect so Spotify", null);
            WebAPIFactory webApiFactory = new WebAPIFactory(
                   "http://localhost",
                   8000,
                   "XXXXXXXXXXXXXXXXXXXXX",
                   Scope.None,
                   TimeSpan.FromSeconds(20)
            );

            try
            {
                _spotifyWeb = await webApiFactory.GetWebApi();
            }
            catch (Exception ex)
            {
                WriteConsole(ex.Message, ex);
            }
            if (_spotify == null)
                return;
        }

and after a while

FullTrack fulltrack = null;
fulltrack = _spotifyWeb.GetTrack(SPOTIFY_URI);

always returns null.

[jscholes]

I do this every 20 minutes but after 3600 secs when token expires, API doesn’t respond anymore.

There’s no need to refresh your token every 20 minutes when they last for 60. Either refresh it once the API tells you the token has expired, or set up some sort of timer to refresh the token just before that (say at 55-59 minutes). Then ensure that you’re updating the access token which is actually being sent to the API. It’s not enough to simply refresh the token, you need to actually make sure your API requests are being sent by updating the access token which is being used by your SpotifyWebAPI instance.

[JohnnyCrazy]

Please have a look at the methods provided by those objects before asking, VS should help you out in a lot of times:

https://github.com/JohnnyCrazy/SpotifyAPI-NET/blob/df53f75368717e9b071fe9f97ad8becfcc73a5ee/SpotifyAPI/Web/Auth/AutorizationCodeAuth.cs#L45

https://github.com/JohnnyCrazy/SpotifyAPI-NET/blob/df53f75368717e9b071fe9f97ad8becfcc73a5ee/SpotifyAPI/Web/Models/Token.cs#L20