How to refresh Spotify authentication token automatically

Other Questions Spotify
1

I’m working on an iOS app with Spotify integration and I’m facing difficulties with automatic session renewal. My current functions include handling login, checking session validity, saving, and loading the session, but when I attempt to renew the session, it consistently returns nil.

Authentication Method

func authenticateWithSpotify(presentingController controller: UIViewController, onSuccess: (token: String?) -> Void, onError: (err: NSError?) -> Void) {
    successCallback = onSuccess
    errorCallback = onError
    
    SPTAuth.defaultInstance().clientID = MySpotifyClientID
    SPTAuth.defaultInstance().redirectURL = NSURL(string: MyRedirectURI)
    SPTAuth.defaultInstance().requestedScopes = [SPTAuthStreamingScope, SPTAuthPlaylistReadPrivateScope]
    
    let authController = SPTAuthViewController.authenticationViewController()
    authController.delegate = self
    authController.clearCookies { () -> Void in
        controller.presentViewController(authController, animated: true, completion: nil)
    }
}

Session Validation

private func isSpotifyAuthenticated() -> Bool {
    if SPTAuth.defaultInstance().session == nil {
        self.restoreSpotifySession()
    }
    return SPTAuth.defaultInstance().session != nil
}

Session Persistence

private func storeSpotifySession() {
    let data = NSKeyedArchiver.archivedDataWithRootObject(SPTAuth.defaultInstance().session)
    NSUserDefaults.standardUserDefaults().setObject(data, forKey: Spotify_Auth_Key)
    NSUserDefaults.standardUserDefaults().synchronize()
}

private func restoreSpotifySession() {
    if let data = NSUserDefaults.standardUserDefaults().objectForKey(Spotify_Auth_Key) as? NSData {
        let restoredSession = NSKeyedUnarchiver.unarchiveObjectWithData(data) as! SPTSession
        SPTAuth.defaultInstance().session = restoredSession
    }
}

Token Refresh Issue

func refreshSpotifyToken() {
    guard isSpotifyAuthenticated() else {
        return
    }
    
    SPTAuth.defaultInstance().renewSession(SPTAuth.defaultInstance().session) { (err: NSError!, newSession: SPTSession!) -> Void in
        if newSession != nil {
            SPTAuth.defaultInstance().session = newSession
        } else {
            print("Session refresh failed")
        }
    }
}

The refresh method keeps returning nil and I’m not sure how to handle the refresh token properly. What am I missing in my session renewal implementation?

2

yep, make sure ur saving the refresh token correctly with the session. and don’t forget to check that ur client secret is right in the Spotify dev console. those are usually the main issues people run into.