115 lines
3.7 KiB
JavaScript
115 lines
3.7 KiB
JavaScript
const isLocalhost = Boolean(
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window.location.hostname === 'localhost'
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|| window.location.hostname === '[::1]'
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|| window.location.hostname.match(
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/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/,
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),
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);
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export function register(config) {
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if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
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const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
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if (publicUrl.origin !== window.location.origin) {
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return;
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}
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window.addEventListener('load', () => {
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const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
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if (isLocalhost) {
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checkValidServiceWorker(swUrl, config);
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navigator.serviceWorker.ready.then(() => {
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console.log(
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'This web app is being served cache-first by a service '
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+ 'worker. To learn more, visit http://bit.ly/CRA-PWA',
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);
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});
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} else {
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// Is not localhost. Just register service worker
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registerValidSW(swUrl, config);
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}
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});
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}
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}
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function registerValidSW(swUrl, config) {
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navigator.serviceWorker
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.register(swUrl)
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.then((registration) => {
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registration.onupdatefound = () => {
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const installingWorker = registration.installing;
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if (installingWorker == null) {
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return;
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}
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installingWorker.onstatechange = () => {
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if (installingWorker.state === 'installed') {
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if (navigator.serviceWorker.controller) {
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// At this point, the updated precached content has been fetched,
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// but the previous service worker will still serve the older
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// content until all client tabs are closed.
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console.log(
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'New content is available and will be used when all '
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+ 'tabs for this page are closed. See http://bit.ly/CRA-PWA.',
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);
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// Execute callback
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if (config && config.onUpdate) {
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config.onUpdate(registration);
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}
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} else {
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// At this point, everything has been precached.
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// It's the perfect time to display a
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// "Content is cached for offline use." message.
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console.log('Content is cached for offline use.');
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// Execute callback
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if (config && config.onSuccess) {
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config.onSuccess(registration);
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}
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}
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}
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};
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};
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})
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.catch((error) => {
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console.error('Error during service worker registration:', error);
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});
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}
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function checkValidServiceWorker(swUrl, config) {
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// Check if the service worker can be found. If it can't reload the page.
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fetch(swUrl)
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.then((response) => {
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// Ensure service worker exists, and that we really are getting a JS file.
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const contentType = response.headers.get('content-type');
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if (
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response.status === 404
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|| (contentType != null && contentType.indexOf('javascript') === -1)
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) {
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// No service worker found. Probably a different app. Reload the page.
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navigator.serviceWorker.ready.then((registration) => {
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registration.unregister().then(() => {
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window.location.reload();
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});
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});
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} else {
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// Service worker found. Proceed as normal.
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registerValidSW(swUrl, config);
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}
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})
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.catch(() => {
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console.log(
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'No internet connection found. App is running in offline mode.',
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);
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});
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}
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export function unregister() {
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if ('serviceWorker' in navigator) {
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navigator.serviceWorker.ready.then((registration) => {
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registration.unregister();
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});
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}
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}
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