How to renew spotify session?

Question

I have an application that allow users to stream songs from spotify. So to achieve that I need to renew session from time to time whenever users want to stream song from spotify. I'm using latest spotify sdk (beta-9), and I'm currently following tutorial from https://www.youtube.com/watch?v=GeO00YdJ3cE. In that tutorial we need to refresh token swap but when I looked from https://developer.spotify.com/technologies/spotify-ios-sdk/tutorial/ there is no need to refresh token swap.

and I end up not using the token swap, when I refresh my session then play song with renewed session, I got below error:

Error Domain=com.spotify.ios-sdk.playback Code=8 "Login to Spotify failed because of invalid credentials." UserInfo=0x7f840bf807b0 {NSLocalizedDescription=Login to Spotify failed because of invalid credentials.}

And I'm using this code below, for renewing my session:

 let userDefaults = NSUserDefaults.standardUserDefaults()

    if let sessionObj : AnyObject = NSUserDefaults.standardUserDefaults().objectForKey("spotifySession") {

        let sessionDataObj : NSData = sessionObj as! NSData
        let session = NSKeyedUnarchiver.unarchiveObjectWithData(sessionDataObj) as! SPTSession
        self.playUsingSession(session)

        if !session.isValid() {

            SPTAuth.defaultInstance().renewSession(session, callback: { (error : NSError!, newsession : SPTSession!) -> Void in

                if error == nil {

                    let sessionData = NSKeyedArchiver.archivedDataWithRootObject(session)
                    userDefaults.setObject(sessionData, forKey: "spotifySession")
                    userDefaults.synchronize()

                    self.session = newsession

                    self.playUsingSession(newsession)

                }else{

                    println("renew session having problerm >>>>> \(error)")

                }
            })
        }else{

            println("session is still valid")
            self.playUsingSession(session)

        }

    }else{

        spotifyLoginButton.hidden = false

    }

and below code to stream spotify songs:

func playUsingSession(sessionObj:SPTSession!){

    if spotifyPlayer == nil {

        spotifyPlayer = SPTAudioStreamingController(clientId: kSpotifyClientID)

    }

    spotifyPlayer?.loginWithSession(sessionObj, callback: { (error : NSError!) -> Void in
        if error != nil {

            println("enabling playback got error : \(error)")

            return

        }
        var spotifyTrackUri : NSURL = NSURL(string: "spotify:track:3FREWTEY2uFxOorJZMmZPX")!
        self.spotifyPlayer!.playURIs([spotifyTrackUri], fromIndex: 0, callback: { (error : NSError!) -> Void in
            if error != nil {

                println("\(error)")

            }
        })

    })

}

Do I still need to refresh token swap for latest sdk? Or is there something missing with my code?

Answer 1

By default, users need to login once per hour for apps using the Spotify SDK unless you use the Authorization Code flow. To use this flow you'll need to setup a server to handle token swap and refresh.

1. Setup a free server with this one-click-deploy to Heroku https://github.com/adamontherun/SpotifyTokenRefresh

2. Using the URL of the server created above add the following when configuring your SPTAuth.defaultInstance():

   SPTAuth.defaultInstance().tokenSwapURL = URL(string: "https://YOURSERVERNAME.herokuapp.com/swap") SPTAuth.defaultInstance().tokenRefreshURL = URL(string: "https://YOURSERVERNAME.herokuapp.com/refresh")

3. Before using your session check if it is valid:

   if SPTAuth.defaultInstance().session.isValid()

and if it isn't call

SPTAuth.defaultInstance().renewSession(SPTAuth.defaultInstance().session, callback: { (error, session) in
                        if let session = session {
                            SPTAuth.defaultInstance().session = session
                        } 
                    })