Login with Amazon using AWSMobileClient integration sample main ViewController

LWAViewController.swift

//
//  ViewController.swift
//  AuthLWA
//
//  Created by Hills, Dennis on 4/26/19.
//  Copyright © 2018 Hills, Dennis. All rights reserved.
//
//  Gist: https://gist.github.com/mobilequickie/77c60e2204e759ed0a72bde0478c0885
//
import UIKit
import LoginWithAmazon
import AWSMobileClient // #1

class ViewController: UIViewController, AIAuthenticationDelegate {
    
    @IBOutlet weak var btnLWALogin: UIButton!
    @IBOutlet weak var btnLWALogout: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        initializeAWSMobileClient() // #2 Initialize the AWSMobileClient
    }
    
    // #3 Initializing the AWSMobileClient and take action based on current user state
    func initializeAWSMobileClient() {
        AWSMobileClient.sharedInstance().initialize { (userState, error) in
            
            if let userState = userState {
                switch(userState){
                case .signedIn: // is Signed IN
                    print("Logged In")
                    print("Cognito Identity Id (authenticated): \(String(describing: AWSMobileClient.sharedInstance().identityId))")
                case .signedOut: // is Signed OUT
                    print("Logged Out")
                    print("Cognito Identity Id (unauthenticated): \(String(describing: AWSMobileClient.sharedInstance().identityId))")
                case .signedOutUserPoolsTokenInvalid: // User Pools refresh token INVALID
                    print("User Pools refresh token is invalid or expired.")
                case .signedOutFederatedTokensInvalid: // e.g. Facebook, Google, or Login with Amazon refresh token is INVALID
                    print("Federated refresh token is invalid or expired.")
                default:
                    AWSMobileClient.sharedInstance().signOut()
                }
            } else if let error = error {
                print(error.localizedDescription)
            }
        }
    }
    
    // Begin LWA integration
    // User taps [Login with Amazon] button
    @IBAction func onClickLWALogin(_ sender: Any) {
        LoginWithAmazonProxy.sharedInstance.login(delegate: self)
    }
    
    // User taps [Logout]
    @IBAction func onClickLWALogout(_ sender: Any) {
        AMZNAuthorizationManager.shared().signOut { (error) in
            if((error) != nil) {
                print("error signing out: \(String(describing: error))")
            } else {
                print("Logout successfully!")
                DispatchQueue.main.async(execute: { () -> Void in
                    self.btnLWALogin.isEnabled = true
                    self.btnLWALogout.isEnabled = false
                })
            }
        }
    }
    
    // The login request succeeded and the user is now authenticated via LWA
    func requestDidSucceed(_ apiResult: APIResult!) {
        print("LWA Succeeded!")
        
        DispatchQueue.main.async(execute: { () -> Void in
            self.btnLWALogin.isEnabled = false
            self.btnLWALogout.isEnabled = true
        })
        
        if (apiResult.api == API.authorizeUser) {
            AIMobileLib.getAccessToken(forScopes: ["profile"], withOverrideParams: nil, delegate: self)
        }
        else {
            print("Success! Token: \(apiResult.result ?? "nil")")
        }
    }
    
    // The login request to LWA failed
    func requestDidFail(_ errorResponse: APIError!) {
        print("Error: \(errorResponse.error.message ?? "nil")")
    }
    // End LWA integration
}