Cache HTML page with Service Worker (#6802)

This is the first step to make Mastodon work offline. It is also required
by Chromium to trigger Web Manifest automated install prompt.
This commit is contained in:
Akihiko Odaki 2018-03-17 20:35:13 +09:00 committed by Eugen Rochko
parent 64fc8d2b07
commit f0cd957c7a

View file

@ -1,10 +1,30 @@
import './web_push_notifications';
function fetchRoot() {
return fetch('/', { credentials: 'include' });
}
// Cause a new version of a registered Service Worker to replace an existing one
// that is already installed, and replace the currently active worker on open pages.
self.addEventListener('install', function(event) {
event.waitUntil(self.skipWaiting());
const promises = Promise.all([caches.open('mastodon-web'), fetchRoot()]);
const asyncAdd = promises.then(([cache, root]) => cache.put('/', root));
event.waitUntil(asyncAdd);
});
self.addEventListener('activate', function(event) {
event.waitUntil(self.clients.claim());
});
self.addEventListener('fetch', function(event) {
const url = new URL(event.request.url);
if (url.pathname.startsWith('/web/')) {
event.respondWith(fetchRoot().then(response => {
if (response.ok) {
return response;
}
throw null;
}).catch(() => caches.match('/')));
}
});