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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| // This optional code is used to register a service worker. | ||
| // register() is not called by default. | ||
|
|
||
| // This lets the app load faster on subsequent visits in production, and gives | ||
| // it offline capabilities. However, it also means that developers (and users) | ||
| // will only see deployed updates on subsequent visits to a page, after all the | ||
| // existing tabs open on the page have been closed, since previously cached | ||
| // resources are updated in the background. | ||
|
|
||
| // To learn more about the benefits of this model and instructions on how to | ||
| // opt-in, read https://bit.ly/CRA-PWA | ||
|
|
||
| const isLocalhost = Boolean( | ||
| window.location.hostname === 'localhost' || | ||
| // [::1] is the IPv6 localhost address. | ||
| window.location.hostname === '[::1]' || | ||
| // 127.0.0.0/8 are considered localhost for IPv4. | ||
| window.location.hostname.match( | ||
| /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/ | ||
| ) | ||
| ); | ||
|
|
||
| export function register(config) { | ||
| if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) { | ||
| // The URL constructor is available in all browsers that support SW. | ||
| const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href); | ||
| if (publicUrl.origin !== window.location.origin) { | ||
| // Our service worker won't work if PUBLIC_URL is on a different origin | ||
| // from what our page is served on. This might happen if a CDN is used to | ||
| // serve assets; see https://github.com/facebook/create-react-app/issues/2374 | ||
| return; | ||
| } | ||
|
|
||
| window.addEventListener('load', () => { | ||
| const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`; | ||
|
|
||
| if (isLocalhost) { | ||
| // This is running on localhost. Let's check if a service worker still exists or not. | ||
| checkValidServiceWorker(swUrl, config); | ||
|
|
||
| // Add some additional logging to localhost, pointing developers to the | ||
| // service worker/PWA documentation. | ||
| navigator.serviceWorker.ready.then(() => { | ||
| console.log( | ||
| 'This web app is being served cache-first by a service ' + | ||
| 'worker. To learn more, visit https://bit.ly/CRA-PWA' | ||
| ); | ||
| }); | ||
| } else { | ||
| // Is not localhost. Just register service worker | ||
| registerValidSW(swUrl, config); | ||
| } | ||
| }); | ||
| } | ||
| } | ||
|
|
||
| function registerValidSW(swUrl, config) { | ||
| navigator.serviceWorker | ||
| .register(swUrl) | ||
| .then(registration => { | ||
| registration.onupdatefound = () => { | ||
| const installingWorker = registration.installing; | ||
| if (installingWorker == null) { | ||
| return; | ||
| } | ||
| installingWorker.onstatechange = () => { | ||
| if (installingWorker.state === 'installed') { | ||
| if (navigator.serviceWorker.controller) { | ||
| // At this point, the updated precached content has been fetched, | ||
| // but the previous service worker will still serve the older | ||
| // content until all client tabs are closed. | ||
| console.log( | ||
| 'New content is available and will be used when all ' + | ||
| 'tabs for this page are closed. See https://bit.ly/CRA-PWA.' | ||
| ); | ||
|
|
||
| // Execute callback | ||
| if (config && config.onUpdate) { | ||
| config.onUpdate(registration); | ||
| } | ||
| } else { | ||
| // At this point, everything has been precached. | ||
| // It's the perfect time to display a | ||
| // "Content is cached for offline use." message. | ||
| console.log('Content is cached for offline use.'); | ||
|
|
||
| // Execute callback | ||
| if (config && config.onSuccess) { | ||
| config.onSuccess(registration); | ||
| } | ||
| } | ||
| } | ||
| }; | ||
| }; | ||
| }) | ||
| .catch(error => { | ||
| console.error('Error during service worker registration:', error); | ||
| }); | ||
| } | ||
|
|
||
| function checkValidServiceWorker(swUrl, config) { | ||
| // Check if the service worker can be found. If it can't reload the page. | ||
| fetch(swUrl, { | ||
| headers: { 'Service-Worker': 'script' } | ||
| }) | ||
| .then(response => { | ||
| // Ensure service worker exists, and that we really are getting a JS file. | ||
| const contentType = response.headers.get('content-type'); | ||
| if ( | ||
| response.status === 404 || | ||
| (contentType != null && contentType.indexOf('javascript') === -1) | ||
| ) { | ||
| // No service worker found. Probably a different app. Reload the page. | ||
| navigator.serviceWorker.ready.then(registration => { | ||
| registration.unregister().then(() => { | ||
| window.location.reload(); | ||
| }); | ||
| }); | ||
| } else { | ||
| // Service worker found. Proceed as normal. | ||
| registerValidSW(swUrl, config); | ||
| } | ||
| }) | ||
| .catch(() => { | ||
| console.log( | ||
| 'No internet connection found. App is running in offline mode.' | ||
| ); | ||
| }); | ||
| } | ||
|
|
||
| export function unregister() { | ||
| if ('serviceWorker' in navigator) { | ||
| navigator.serviceWorker.ready.then(registration => { | ||
| registration.unregister(); | ||
| }); | ||
| } | ||
| } |