How to renew spotify session? - ios

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

Answer 2

I recommend follow this tutorial: https://medium.com/#brianhans/getting-started-with-the-spotify-ios-sdk-435607216ecc and this one too: https://medium.com/#brianhans/spotify-ios-sdk-authentication-b2c35cd4affb
After you finished, you'll see that you create a file called "Constants.swift" just like this:
import Foundation
struct Constants {
static let clientID = "XXXXXXXXXXXXXXXXXXXX"
static let redirectURI = URL(string: "yourappname://")!
static let sessionKey = "spotifySessionKey"
}
Then, you can follow the steps in Heroku (Do not enter in panic is very simple):
https://github.com/adamontherun/SpotifyTokenRefresh
almost ready, when your server is "working", come back to your Xcode Project and add two static constants in your "Constants.swift" file, just like this:
import Foundation
struct Constants {
static let clientID = "XXXXXXXXXXXXXXXXXXXX"
static let redirectURI = URL(string: "yourappname://")!
static let sessionKey = "spotifySessionKey"
static let tokenSawp = URL(string: "https://yourappname.herokuapp.com/swap")
static let tokenRefresh = URL(string:"https://yourappname.herokuapp.com/refresh")
}
To finish, go to AppDelegate.swift and search "func setupSpotify()".. Add the new two constants, your function should look like this:
func setupSpotify() {
SPTAuth.defaultInstance().clientID = Constants.clientID
SPTAuth.defaultInstance().redirectURL = Constants.redirectURI
SPTAuth.defaultInstance().sessionUserDefaultsKey = Constants.sessionKey
SPTAuth.defaultInstance().tokenSwapURL = Constants.tokenSawp //new constant added
SPTAuth.defaultInstance().tokenRefreshURL = Constants.tokenRefresh //new constant added
SPTAuth.defaultInstance().requestedScopes = [SPTAuthStreamingScope]
do {
try SPTAudioStreamingController.sharedInstance().start(withClientId: Constants.clientID)
} catch {
fatalError("Couldn't start Spotify SDK")
}
}
As a last step, just add the SPTAuth.defaultInstance().renewSession in you signInSpotify function, should look like this:
#IBAction func SignInSpotify(_ sender: Any) {
if SPTAuth.defaultInstance().session == nil {
let appURL = SPTAuth.defaultInstance().spotifyAppAuthenticationURL()
let webURL = SPTAuth.defaultInstance().spotifyWebAuthenticationURL()!
// Before presenting the view controllers we are going to start watching for the notification
NotificationCenter.default.addObserver(self,
selector: #selector(receievedUrlFromSpotify(_:)),
name: NSNotification.Name.Spotify.authURLOpened,
object: nil)
if SPTAuth.supportsApplicationAuthentication() {
UIApplication.shared.open(appURL!, options: [:], completionHandler: nil)
} else {
let webVC = SFSafariViewController(url: webURL)
present(webVC, animated: true, completion: nil)
}
} else if SPTAuth.defaultInstance().session.isValid() == true {
print("YOUR SESSION IS VALID")
self.successfulLogin()
} else {
print("YOUR SESSION IS NOT VALID / NEED RENEW")
//Every 60 minutes the token need a renew https://github.com/spotify/ios-sdk
SPTAuth.defaultInstance().renewSession(SPTAuth.defaultInstance().session, callback: { (error, session) in
if let session = session {
SPTAuth.defaultInstance().session = session
self.successfulLogin()
print("RENEW OK")
}
if let error = error {
print("RENEW NOT OK \(error)")
}
})
}
}
Good Luck!