wehub-resource-sync
53 lines
2.5 KiB
JavaScript
53 lines
2.5 KiB
JavaScript
// Omnigent installability / update-only service worker (hand-rolled).
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//
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// Omnigent is a cloud app with NO offline mode, so this worker deliberately:
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// - does NOT precache or serve the app shell, and
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// - does NOT intercept navigations — every navigation hits the network, so a
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// deploy is never masked behind a stale cached shell.
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// It exists only to (a) make the app installable and (b) drive the in-app
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// "new version → Reload" prompt (see src/components/pwa/useServiceWorkerUpdate).
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//
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// BUILD_VERSION is replaced at build time (vite.config.ts → emitPwaAssets) with
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// a fingerprint of the hashed JS/CSS outputs, so this file's bytes change on
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// every code/style deploy. That byte change is what the browser's update
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// algorithm (via workbox-window in the page) detects to fire the prompt.
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const BUILD_VERSION = "__BUILD_VERSION__";
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const CACHE_NAME = `omnigent-pwa-${BUILD_VERSION}`;
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self.addEventListener("install", (event) => {
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// Precache ONLY version.json. Two reasons: it gives the worker a real
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// (non-empty) fetch handler — Chrome's automatic install prompt ignores
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// no-op handlers — and the per-build cache name means each deploy starts a
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// fresh cache. We do NOT call skipWaiting(): a new build waits in the
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// background until the user accepts the prompt.
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event.waitUntil(caches.open(CACHE_NAME).then((cache) => cache.add("/version.json")));
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});
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self.addEventListener("activate", (event) => {
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// Drop caches from prior builds. No clients.claim(): in prompt mode the new
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// worker must not take control of open pages until the user accepts.
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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_NAME).map((key) => caches.delete(key))),
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),
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);
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});
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self.addEventListener("message", (event) => {
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// workbox-window's messageSkipWaiting() posts this when the user clicks Reload.
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if (event.data && event.data.type === "SKIP_WAITING") self.skipWaiting();
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});
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self.addEventListener("fetch", (event) => {
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// Respond ONLY for the version sentinel (cache-first, network fallback).
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// Everything else — navigations, hashed assets, everything — falls through
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// with no respondWith(), i.e. straight to the network. This keeps a real
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// fetch handler without ever serving a stale app shell.
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const url = new URL(event.request.url);
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if (url.pathname === "/version.json") {
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event.respondWith(caches.match(event.request).then((cached) => cached || fetch(event.request)));
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}
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});
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