iOS Swift, AWS Cognito User Pool, Unable to Refresh Access Token

Question

Looked at similar SO questions which didn't help me resolve the issue.

I am using AWS Cognito User Pools in our iOS App. We are able to successfully create and login the user. However after about an Hr the access token is not available, I understand from AWS Cognito documentation that the iOS SDK automatically refreshes (also mentioned here) and obtains the token when it is not available, however I don't see this behaviour. The below code shows how I am trying to obtain the access token.

Using iOS SDK AWSCognitoIdentityProvider 2.6.7

Please advice how I can resolve the issue.

let mySession = self.pool.currentUser()?.getSession()

guard let accessToken = mySession?.result?.accessToken?.tokenString as? String else {
  print("Unable to obtain access token")
  self.handleSignOut() // Signing out the user since there is no access token       
  return
}

Answer 1

getSession() returns an AWSTask.

You have to access the tokenString in the callback.

The following code works for me:

self.pool.currentUser()?.getSession().continueWith { task in

    if task.error == nil {
        let session = task.result! as AWSCognitoIdentityUserSession
        guard let accessToken = session.idToken?.tokenString; as? String else {
           print("Unable to obtain access token")
           self.handleSignOut() // Signing out the user since there is no access token       
        }
    }
}