Amazon Cognito

//Android
// 1) -- Create an instance of Auth --
Auth.Builder builder = new Auth.Builder()
  .setAppClientId(getString(R.string.cognito_client_id));    
  .setAppCognitoWebDomain(getString(R.string.cognito_web_domain));
  .setApplicationContext(getApplicationContext());
  .setAuthHandler(new callback());
  .setSignInRedirect(getString(R.string.app_redirect_signin));
  .setSignOutRedirect(getString(R.string.app_redirect_signout));
  .setScopes(userScopes);
  auth = builder.build();
 
// 2) – Set up url redirect in your app manifest --
<intent-filter>
  <data android:host="YOUR_REDIRECT_URI_AUTHORITY"android:scheme="YOUR_REDIRECT_SCHEME"/>
</intent-filter>
 
// 3) -- Get tokens for your user --
auth.getSession();

// iOS Swift
// AppDelegate.swift
func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
  return AWSCognitoAuth.default().application(app, open: url, options: options)
}
// ViewController.swift
let cognitoAuth = AWSCognitoAuth.default()
cognitoAuth.getSession(self)  { (session:AWSCognitoAuthUserSession?, error:Error?) in
  if(error != nil) {
    print((error! as NSError).userInfo["error"] as? String)
   }else {
   //Do something with session
  }
}

// Add amazon-cognito-auth-js SDK in your application.
//1) -- Create an instance of Auth --
  var authData = {
  ClientId                       : '<add ClientId>',
  AppWebDomain       : '<add App Web Domain>',
  TokenScopesArray   : '<add scope array>',
  RedirectUriSignIn    : '<add redirect url when signed in>',
  RedirectUriSignOut : '<add redirect url when signed out>'
};
var auth = new AWSCognito.CognitoIdentityServiceProvider.CognitoAuth(authData);
 
// 2) -- Get tokens for your user --
auth.getSession();