103 lines
2.6 KiB
JavaScript
103 lines
2.6 KiB
JavaScript
/* every.channel PWA service worker
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*
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* Goal: cache the app shell so it can be installed and load offline.
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* Do not interfere with media fetching/streaming: always network-pass-through
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* for non-GET requests and for large binary media responses.
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*/
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const CACHE_NAME = "every.channel-shell-v1";
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const SHELL = [
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"./",
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"./index.html",
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"./style.css",
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"./manifest.webmanifest",
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"./icons/icon-192.png",
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"./icons/icon-512.png",
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"./icons/apple-touch-icon.png",
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];
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self.addEventListener("install", (event) => {
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event.waitUntil(
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caches
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.open(CACHE_NAME)
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.then((cache) => cache.addAll(SHELL))
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.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
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.keys()
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.then((keys) =>
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Promise.all(
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keys.map((key) => {
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if (key !== CACHE_NAME) return caches.delete(key);
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return Promise.resolve();
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})
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)
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)
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.then(() => self.clients.claim())
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);
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});
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function isNavigationRequest(request) {
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return request.mode === "navigate";
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}
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function isMediaRequest(request) {
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const url = new URL(request.url);
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const path = url.pathname.toLowerCase();
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return (
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path.endsWith(".m3u8") ||
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path.endsWith(".m4s") ||
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path.endsWith(".mp4") ||
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path.endsWith(".ts")
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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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// Don't cache/modify streaming media requests.
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if (isMediaRequest(request)) {
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event.respondWith(fetch(request));
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return;
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}
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// For navigations, prefer network but fall back to cached shell.
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if (isNavigationRequest(request)) {
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event.respondWith(
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fetch(request).catch(() => caches.match("./index.html").then((r) => r || Response.error()))
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);
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return;
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}
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// Cache-first for same-origin static assets; network fallback.
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const url = new URL(request.url);
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if (url.origin === self.location.origin) {
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event.respondWith(
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caches.match(request).then((cached) => {
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if (cached) return cached;
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return fetch(request)
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.then((resp) => {
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// Avoid caching huge binary responses.
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const len = resp.headers.get("content-length");
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const tooBig = len && Number(len) > 5_000_000;
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if (resp.ok && !tooBig) {
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const clone = resp.clone();
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caches.open(CACHE_NAME).then((cache) => cache.put(request, clone)).catch(() => {});
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}
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return resp;
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})
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.catch(() => cached || Response.error());
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})
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);
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return;
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}
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// Default: network.
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event.respondWith(fetch(request));
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});
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