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Update 12 files
- /vendor/libarchive/LICENSE - /vendor/libarchive/worker-bundle.js - /vendor/libarchive/wasm-gen/libarchive.js - /vendor/libarchive/wasm-gen/libarchive.wasm - /sw.js - /offline.md - /_layouts/default.html - /_tools/serv00_post-receive - /_tools/envs_post-receive - /_data/proxylist.yml - /assets/js/offline-page.js - /assets/js/offline-unpack.js
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/*
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* Mayx的博客 · 离线模式 Service Worker
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*
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* 两种模式(由 Cache Storage 中是否存在就绪标记决定):
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* - 在线模式(默认,无标记):所有请求原样转发网络,SW 形同虚设。
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* - 离线模式(/offline.html 启用后写入标记):同源 GET 请求缓存优先,
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* 缓存未命中且清单里没有的路径才回源网络,实现断网阅读。
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*
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* 版本控制:压缩包 /MayxBlog.7z 的 content-length 即版本号(每次重新部署
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* 都会变化)。SW 激活时、以及导航请求按 RECHECK_INTERVAL 节流复核;
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* 一旦发现线上压缩包与已缓存版本不一致,立即清空缓存 → 自动回退在线模式。
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* 网络不可用时复核失败,保留缓存(离线阅读本来就是离线模式的目的)。
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*/
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const CACHE_NAME = 'mayxblog-offline-v1';
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const READY_KEY = '/__offline_manifest__';
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const ARCHIVE_URL = '/MayxBlog.7z';
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const RECHECK_INTERVAL = 5 * 60 * 1000;
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let lastRecheck = 0;
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self.addEventListener('install', () => {
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self.skipWaiting();
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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) =>
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Promise.all(keys.filter((k) => k !== CACHE_NAME).map((k) => caches.delete(k)))
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)
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.then(verifyPayloadVersion)
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.then(() => self.clients.claim())
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);
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});
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/*
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* HEAD 请求不被下面的 fetch 处理器拦截,这里读到的一定是线上真实压缩包,
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* 而不是缓存里的 quine 副本。网络失败返回 null,调用方选择信任现有缓存。
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*/
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async function payloadSize() {
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try {
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const response = await fetch(ARCHIVE_URL, { method: 'HEAD', cache: 'no-store' });
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if (!response.ok) return null;
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const size = Number(response.headers.get('content-length'));
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return Number.isFinite(size) && size > 0 ? size : null;
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} catch {
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return null;
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}
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}
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/*
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* 就绪标记同时是清单:记录了解包写入的所有路径。没有它就无法区分
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* “站点本来就没有这个页面”和“缓存条目被浏览器回收了”。
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*/
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async function readManifest(cache) {
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const hit = await cache.match(READY_KEY);
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if (!hit) return null;
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const meta = await hit.json().catch(() => null);
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if (!meta || !Array.isArray(meta.keys) || !meta.keys.length) return null;
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return meta;
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}
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/* 压缩包更新 → 清空缓存(即回退在线模式);返回是否发生了失效。 */
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async function verifyPayloadVersion() {
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const cache = await caches.open(CACHE_NAME);
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const meta = await readManifest(cache);
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if (!meta) return false;
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const size = await payloadSize();
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if (size && meta.payloadSize !== size) {
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await caches.delete(CACHE_NAME);
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return true;
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}
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return false;
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}
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/* 服务器对目录索引的处理与 Jekyll 产物一致,这里补齐候选路径。 */
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function candidatesFor(pathname) {
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const keys = [pathname];
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if (pathname.endsWith('/')) {
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keys.push(pathname + 'index.html');
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} else {
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keys.push(pathname + '/index.html');
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keys.push(pathname + '.html');
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}
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return keys;
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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; // HEAD 等直通网络(版本探测依赖这一点)
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const url = new URL(request.url);
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if (url.origin !== self.location.origin) return; // 跨域请求不干预
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// 显式 no-store 的请求(重新下载压缩包等)绕过缓存,避免吃到旧的 quine 副本
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if (request.cache === 'no-store') return;
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event.respondWith(respond(request, url, event));
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});
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async function respond(request, url, event) {
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const cache = await caches.open(CACHE_NAME);
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// 导航请求顺带做节流版本复核;失效发生在后台,本次响应不受影响,
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// 下一次请求自然落入在线模式。
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if (request.mode === 'navigate' && Date.now() - lastRecheck > RECHECK_INTERVAL) {
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lastRecheck = Date.now();
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event.waitUntil(verifyPayloadVersion());
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}
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const candidates = candidatesFor(url.pathname);
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for (const key of candidates) {
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const hit = await cache.match(key);
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if (hit) return hit;
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}
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const meta = await readManifest(cache);
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if (!meta) return fetch(request); // 在线模式:纯转发
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// 清单承诺过这个路径但缓存里没有 → 条目被浏览器回收,缓存已不可信,
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// 整体作废并回退在线模式。
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if (candidates.some((key) => meta.keys.includes(key))) {
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await caches.delete(CACHE_NAME);
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return fetch(request);
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}
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// 清单之外的路径回源网络;断网时的导航请求用站点 404 页兜底。
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try {
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return await fetch(request);
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} catch (error) {
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if (request.mode === 'navigate') {
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const notFound = await cache.match('/404.html');
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if (notFound) {
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return new Response(notFound.body, { status: 404, headers: notFound.headers });
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}
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}
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throw error;
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}
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}
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