69 lines
2.1 KiB
JavaScript
69 lines
2.1 KiB
JavaScript
// Served from / (not /static/) so its scope covers /admin/today/.
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const CACHE = "osiris-v1";
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self.addEventListener("install", (event) => {
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self.skipWaiting();
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});
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self.addEventListener("activate", (event) => {
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event.waitUntil(
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caches
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.keys()
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.then((keys) =>
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Promise.all(keys.filter((key) => key !== CACHE).map((key) => caches.delete(key)))
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)
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.then(() => self.clients.claim())
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);
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});
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self.addEventListener("fetch", (event) => {
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const { request } = event;
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// Never touch writes or the API: a stale or replayed dose would be a lie.
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if (request.method !== "GET" || new URL(request.url).pathname.startsWith("/api/")) {
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return;
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}
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// Static assets change rarely: serve from cache, refresh in the background.
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if (new URL(request.url).pathname.startsWith("/static/")) {
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event.respondWith(
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caches.open(CACHE).then(async (cache) => {
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const cached = await cache.match(request);
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const network = fetch(request)
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.then((response) => {
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if (response.ok) cache.put(request, response.clone());
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return response;
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})
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.catch(() => cached);
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return cached || network;
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})
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);
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return;
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}
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// Pages: always prefer the live version, fall back to the last one seen so the
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// app still opens (read-only) with no signal.
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event.respondWith(
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fetch(request)
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.then((response) => {
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if (response.ok) {
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const copy = response.clone();
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caches.open(CACHE).then((cache) => cache.put(request, copy));
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}
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return response;
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})
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.catch(async () => {
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const cached = await caches.match(request);
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return (
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cached ||
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new Response(
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"<!doctype html><meta name='viewport' content='width=device-width,initial-scale=1'>" +
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"<body style='font-family:system-ui;background:#202a35;color:#eee;padding:2rem;text-align:center'>" +
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"<h1>Offline</h1><p>Osiris needs a connection to load. Try again once you're back online.</p>",
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{ headers: { "Content-Type": "text/html; charset=utf-8" } }
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)
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);
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})
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);
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});
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