Mark van Wijnen markvanwijnen

## index.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>My Web Application</title>
</head>
<body>

<div id="update-banner" data-state="noupdate">

## service-worker.js
var CACHE_NAME = 'my-web-app-version-v3';

self.addEventListener('install', event => {
    event.waitUntil(
         caches.open(CACHE_NAME)
         .then(cache => {
            return cache.addAll([
                './',
                './index.php',
                './ServiceWorkerUpdateListener.min.js'

## index.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>My Web Application</title>
</head>
<body>

<div id="update-banner" data-state="noupdate">

## service-worker.js
var CACHE_NAME = 'my-web-app-version-v1';

// 1 - Install
// Here we wait for an InstallEvent to fire, then tell the cache which URLs it should retrieve and cache
self.addEventListener('install', event => {
    event.waitUntil(
         caches.open(CACHE_NAME)
         .then(cache => {
            return cache.addAll([
                './',

## TwitterAPI.swift
import SwiftUI
import Combine
import CommonCrypto

class TwitterAPI: NSObject, ObservableObject {
    @Published var authorizationSheetIsPresented = false
    @Published var authorizationURL: URL?
    @Published var user: User?

    private var tokenCredentials: TokenCredentials?

## SafariView.swift
import SwiftUI
import SafariServices

struct SafariView: UIViewControllerRepresentable {
    class SafariViewControllerWrapper: UIViewController {
        private var safariViewController: SFSafariViewController?

        var url: URL? {
            didSet {
                if let safariViewController = safariViewController {

## ContentView.swift
import SwiftUI
import Combine

struct ContentView: View {
    @EnvironmentObject var twitterAPI: TwitterAPI

    var body: some View {
        VStack {
            if let screenName = twitterAPI.user?.screenName {
                Text("Welcome").font(.largeTitle)

## TwitterTutorialApp.swift
import SwiftUI

@main
struct TwitterTutorialApp: App {
    @StateObject var twitterAPI = TwitterAPI()

    var body: some Scene {
        WindowGroup {
            ContentView()
                .environmentObject(twitterAPI)

## oAuthAccessTokenSubscriber.swift
self.subscriptions["oAuthAccessTokenSubscriber"] =
    self.oAuthAccessTokenPublisher(temporaryCredentials: temporaryCredentials,
                                   verifier: oAuthVerifier) // 1
    .receive(on: DispatchQueue.main) // 2
    .sink(receiveCompletion: { _ in // 3
        // Error handler
    }, receiveValue: { [weak self] (tokenCredentials, user) in // 4
        guard let self = self else { return }

        // 5

## tokenCredentials.swift
private var tokenCredentials: TokenCredentials?
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>My Web Application</title>
	</head>
	<body>

	<div id="update-banner" data-state="noupdate">
	var CACHE_NAME = 'my-web-app-version-v3';

	self.addEventListener('install', event => {
	event.waitUntil(
	caches.open(CACHE_NAME)
	.then(cache => {
	return cache.addAll([
	'./',
	'./index.php',
	'./ServiceWorkerUpdateListener.min.js'
	var CACHE_NAME = 'my-web-app-version-v1';

	// 1 - Install
	// Here we wait for an InstallEvent to fire, then tell the cache which URLs it should retrieve and cache
	self.addEventListener('install', event => {
	event.waitUntil(
	caches.open(CACHE_NAME)
	.then(cache => {
	return cache.addAll([
	'./',
	import SwiftUI
	import Combine
	import CommonCrypto

	class TwitterAPI: NSObject, ObservableObject {
	@Published var authorizationSheetIsPresented = false
	@Published var authorizationURL: URL?
	@Published var user: User?

	private var tokenCredentials: TokenCredentials?
	import SwiftUI
	import SafariServices

	struct SafariView: UIViewControllerRepresentable {
	class SafariViewControllerWrapper: UIViewController {
	private var safariViewController: SFSafariViewController?

	var url: URL? {
	didSet {
	if let safariViewController = safariViewController {
	import SwiftUI
	import Combine

	struct ContentView: View {
	@EnvironmentObject var twitterAPI: TwitterAPI

	var body: some View {
	VStack {
	if let screenName = twitterAPI.user?.screenName {
	Text("Welcome").font(.largeTitle)
	import SwiftUI

	@main
	struct TwitterTutorialApp: App {
	@StateObject var twitterAPI = TwitterAPI()

	var body: some Scene {
	WindowGroup {
	ContentView()
	.environmentObject(twitterAPI)
	self.subscriptions["oAuthAccessTokenSubscriber"] =
	self.oAuthAccessTokenPublisher(temporaryCredentials: temporaryCredentials,
	verifier: oAuthVerifier) // 1
	.receive(on: DispatchQueue.main) // 2
	.sink(receiveCompletion: { _ in // 3
	// Error handler
	}, receiveValue: { [weak self] (tokenCredentials, user) in // 4
	guard let self = self else { return }

	// 5