Swift - AWS Cognito-Facebook Login - ios

Question

I want to use Facebook for my login process with Cognito, and I've followed a lot of AWS documentation and look at tutorials and questions in Stackoverflow, but I've not found a solution for my problem.
When the user opens the app, it will check if the user is logged in using IdentityManager. If not, it will open a new view where the user can sign in using Facebook using Facebook SDK. After that, I stored the token with a custom IdentityProvider as the documentation said (credentialsProvider.logins is deprecated). Everything seems to work fine, but every time I reopen the application, my session isn't restored.
I found out that if I use AWSIdentityManager.defaultIdentityManager().resumeSessionWithCompletionHandler(handler)I restored my session, but in case the user isn't logged in, it doesn't show my custom login screen as expected, but a Safari web view to Facebook.
Here is my code:
AppDelegate.swift
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
let identityManager = AWSIdentityManager.defaultIdentityManager()
identityManager.resumeSessionWithCompletionHandler({
(result, error) -> Void in
if !identityManager.loggedIn {
let mainStoryboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let initialViewControlleripad : UIViewController = mainStoryboard.instantiateViewControllerWithIdentifier("SignIn") as UIViewController
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
self.window?.rootViewController = initialViewControlleripad
self.window?.makeKeyAndVisible()
}
})
return AWSMobileClient.sharedInstance.didFinishLaunching(application, withOptions: launchOptions)
}
SignInViewController.swift
#IBAction func openFacebookLoginScreen(sender: AnyObject) {
FBSDKLoginManager().logInWithReadPermissions(FACEBOOK_PERMISSIONS, fromViewController: self, handler: { (result, error) -> Void in
if error == nil {
let fbLoginResult : FBSDKLoginManagerLoginResult = result
if fbLoginResult.isCancelled {
print("Cancelled")
}
else {
if FBSDKAccessToken.currentAccessToken() != nil {
self.signInFacebook(FBSDKAccessToken.currentAccessToken().tokenString)
self.dismissSignInView()
}
}
}
})
}
func signInFacebook(fbToken: String){
let logins = [AWSIdentityProviderFacebook : fbToken]
let customProviderManager = CustomIdentityProvider(tokens: logins)
let credentialsProvider = AWSCognitoCredentialsProvider(
regionType:.USEast1,
identityPoolId: COGNITO_IDENTITY_POOL_ID,
identityProviderManager: customProviderManager)
let configuration = AWSServiceConfiguration(region:.USEast1, credentialsProvider: credentialsProvider)
AWSServiceManager.defaultServiceManager().defaultServiceConfiguration = configuration
}
class CustomIdentityProvider: NSObject, AWSIdentityProviderManager {
var tokens : [NSString : NSString]?
init(tokens: [NSString : NSString]) {
self.tokens = tokens
}
#objc func logins() -> AWSTask {
return AWSTask(result: tokens)
}
}

Answer 1

Apparently my problem was that I was calling IdentityManager.loggedIn inside AppDelegate.swift, so I move it to viewDidLoad() on my main view controller.
Also I changed my sign in code to:
#IBAction func openFacebookLoginScreen(_: AnyObject) {
handleLoginWithSignInProvider(AWSFacebookSignInProvider.sharedInstance())
}
func handleLoginWithSignInProvider(signProvider: AWSSignInProvider){
AWSIdentityManager.defaultIdentityManager().loginWithSignInProvider(signProvider) { (result, error) in
if(error == nil){
let logins = [AWSIdentityProviderFacebook : FBSDKAccessToken.currentAccessToken().tokenString!]
let customProviderManager = CustomIdentityProvider(tokens: logins)
let credentialsProvider = AWSCognitoCredentialsProvider(
regionType:.USEast1,
identityPoolId: self.COGNITO_IDENTITY_POOL_ID,
identityProviderManager: customProviderManager)
let configuration = AWSServiceConfiguration(region:.USEast1, credentialsProvider: credentialsProvider)
AWSServiceManager.defaultServiceManager().defaultServiceConfiguration = configuration
self.dismissSignInView()
}
}
}