120 lines
3.7 KiB
JavaScript
120 lines
3.7 KiB
JavaScript
/* Sudoku Tools offline worker. This file intentionally has no dependencies. */
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const CACHE_PREFIX = "sudoku-tools-shell-";
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const CACHE_VERSION = "v1";
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const CACHE_NAME = `${CACHE_PREFIX}${CACHE_VERSION}`;
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const CORE_ASSETS = ["./", "./manifest.webmanifest", "./favicon.svg"];
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const BUILD_ASSET_PATTERN =
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/(?:(?:\.\/)?assets\/)?[A-Za-z0-9][A-Za-z0-9._-]*-[A-Za-z0-9_-]{6,}\.(?:css|js|json|png|svg|wasm)/gu;
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async function cacheAssetTree(cache, assetUrl, discovered, depth = 0) {
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const url = new URL(assetUrl, self.registration.scope).href;
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if (discovered.has(url)) return;
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discovered.add(url);
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const response = await fetch(url, { cache: "no-cache" });
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if (!response.ok) return;
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await cache.put(url, response.clone());
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const contentType = response.headers.get("content-type") ?? "";
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if (depth >= 3 || !/(?:javascript|text\/css)/iu.test(contentType)) return;
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const source = await response.text();
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await Promise.all(
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[...source.matchAll(BUILD_ASSET_PATTERN)].map((match) => {
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const reference = match[0];
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const base = reference.includes("assets/")
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? self.registration.scope
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: url;
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return cacheAssetTree(
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cache,
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new URL(reference, base).href,
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discovered,
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depth + 1,
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);
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}),
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);
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}
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async function cacheDocumentAssets(cache) {
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const response = await fetch("./", { cache: "no-cache" });
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if (!response.ok) throw new Error("Could not cache the application shell.");
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await cache.put("./", response.clone());
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const html = await response.text();
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const urls = new Set(CORE_ASSETS.slice(1));
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for (const match of html.matchAll(/(?:src|href)=["']([^"'#]+)["']/giu)) {
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const raw = match[1];
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if (raw === undefined) continue;
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const resolved = new URL(raw, self.registration.scope);
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if (resolved.origin === self.location.origin) urls.add(resolved.href);
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}
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const canonicalUrls = new Set([new URL("./", self.registration.scope).href]);
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await Promise.all(
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[...urls].map((url) => cacheAssetTree(cache, url, canonicalUrls)),
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);
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await Promise.all(
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(await cache.keys())
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.filter((request) => !canonicalUrls.has(request.url))
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.map((request) => cache.delete(request)),
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);
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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(cacheDocumentAssets)
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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
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.filter((key) => key.startsWith(CACHE_PREFIX) && key !== CACHE_NAME)
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.map((key) => caches.delete(key)),
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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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self.addEventListener("fetch", (event) => {
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const request = event.request;
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if (request.method !== "GET") return;
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const url = new URL(request.url);
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if (url.origin !== self.location.origin) return;
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if (request.mode === "navigate") {
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event.respondWith(
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fetch(request)
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.then(async (response) => {
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if (response.ok) {
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const cache = await caches.open(CACHE_NAME);
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await cache.put("./", response.clone());
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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("./");
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return cached ?? Response.error();
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}),
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);
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return;
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}
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event.respondWith(
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caches.match(request).then(
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(cached) =>
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cached ??
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fetch(request).then(async (response) => {
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if (response.ok && response.type === "basic") {
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const cache = await caches.open(CACHE_NAME);
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await cache.put(request, response.clone());
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}
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return response;
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}),
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),
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);
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});
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