70 lines
2.9 KiB
JavaScript
70 lines
2.9 KiB
JavaScript
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// Self-unregistering stub — replaces the legacy vanilla-frontend
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// service worker that shipped with OxiCloud ≤ 0.8.0.
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//
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// Browsers that installed the old SW keep it registered across upgrades
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// and it intercepts every navigation, serving a stale index.html from its
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// `oxicloud-cache*` Cache Storage. The stale shell's meta-CSP predates
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// the SvelteKit build's inline-script hashes, so hydration is blocked by
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// CSP and the app hangs on the spinner. Symptom: infinite loader on
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// fresh visits, only cleared by a hard refresh. Ref: issue #560.
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//
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// SvelteKit itself does NOT register a service worker (no `src/service-worker`
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// module exists) — this file exists solely to shepherd upgraders off the
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// legacy SW. Browsers on a clean install fetch it, install it, immediately
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// unregister it, and the URL stays a 200 for the next visitor with the
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// same stale-SW problem.
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//
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// The install/activate handlers race the browser's normal SW lifecycle;
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// `skipWaiting` + `clients.claim` fast-forward through the "waiting" and
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// "activating" states so the tab that triggered the update gets reloaded
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// with a controller-less document (no SW intercepting fetches) within
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// the same page lifetime.
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self.addEventListener('install', (event) => {
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event.waitUntil(self.skipWaiting());
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});
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self.addEventListener('activate', (event) => {
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event.waitUntil(
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(async () => {
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// 1. Drop every Cache Storage bucket the legacy SW may have
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// populated. We match the `oxicloud-cache*` prefix the old
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// SW used, plus a defensive wildcard clear if that prefix
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// was ever changed in a fork/downstream build.
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if (self.caches) {
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const keys = await self.caches.keys();
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await Promise.all(keys.map((k) => self.caches.delete(k)));
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}
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// 2. Unregister this SW. After this the browser will not
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// invoke `fetch` handlers from this registration on future
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// navigations.
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await self.registration.unregister();
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// 3. Take control of open clients so we can reload them into
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// a controller-less state (fresh HTML, matching CSP).
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await self.clients.claim();
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const clients = await self.clients.matchAll({ type: 'window' });
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for (const client of clients) {
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// `navigate` beats `location.reload()`-in-postMessage because
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// it works even if the page's JS is CSP-blocked (the case
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// we're fixing). Same URL → same-tab reload without controller.
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try {
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await client.navigate(client.url);
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} catch {
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/* opaque redirect / cross-origin — nothing we can do */
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}
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}
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})()
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);
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});
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// Explicit pass-through fetch handler. Without one, browsers may treat
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// the SW as controlling — with an empty handler they short-circuit to
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// the network. Belt-and-suspenders: we've already unregistered above,
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// but a race between activation and an in-flight navigation could still
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// hit this handler.
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self.addEventListener('fetch', () => {
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/* fall through to network */
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});
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