c7bd71a3e1
PWA card-grading app, deployed behind Nginx Proxy Manager on Unraid with basic auth. Includes CARD_GRADER_BASE_PATH support for running under a sub-path, and Docker/compose config for the Unraid deployment.
62 lines
2.1 KiB
JavaScript
62 lines
2.1 KiB
JavaScript
/* Service worker — the piece that makes this installable as a real app.
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*
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* Deliberately minimal, and deliberately network-first for everything.
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* Caching the shell aggressively is the usual PWA advice, but here it would
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* mean shipping a stale UI against a changed API and calling it offline
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* support — this app cannot do anything useful without the network anyway,
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* since grading is a live API call. So the cache exists only as a fallback
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* for the app shell when the connection drops, and never for /api/.
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*/
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// Substituted server-side to the path this app is mounted under (e.g.
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// "/cards"), or left empty when served from the domain root — see
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// app.py's _static_templated. Every absolute reference below has to go
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// through this, since a service worker has no page URL of its own to
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// resolve relative paths against.
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const BASE = '__BASE__';
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const CACHE = 'card-grader-v1';
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const SHELL = [
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`${BASE}/`,
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`${BASE}/static/app.js`,
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`${BASE}/static/style.css`,
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`${BASE}/static/icon.svg`,
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`${BASE}/static/manifest.json`,
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];
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self.addEventListener('install', (event) => {
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event.waitUntil(
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caches.open(CACHE).then((cache) => cache.addAll(SHELL)).then(() => self.skipWaiting())
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);
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});
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self.addEventListener('activate', (event) => {
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event.waitUntil(
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caches.keys()
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.then((keys) => Promise.all(
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keys.filter((k) => k !== CACHE).map((k) => caches.delete(k))))
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.then(() => self.clients.claim())
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);
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});
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self.addEventListener('fetch', (event) => {
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const { request } = event;
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if (request.method !== 'GET') return;
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const url = new URL(request.url);
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// Never cache the API. A stale grade or a stale settings blob would be
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// worse than an honest failure.
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if (url.pathname.startsWith(`${BASE}/api/`)) return;
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event.respondWith(
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fetch(request)
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.then((response) => {
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if (response && response.ok && url.origin === self.location.origin) {
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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(() => caches.match(request).then((hit) => hit || caches.match(`${BASE}/`)))
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);
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});
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