236 lines
9.1 KiB
JavaScript
236 lines
9.1 KiB
JavaScript
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/* AO3 Mirror Service Worker v5 — Client-side cache + offline fallback + navigation intercept
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*
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* Deployed at /sw-YYYYMMDD.js (versioned), /sw.js redirects to latest.
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* Server injects <script>navigator.serviceWorker.register('/sw.js')</script> into HTML pages.
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*/
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'use strict';
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const MIRROR_DOMAINS = ['agento3.miscs.dev'];
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const PRIMARY_DOMAIN = 'agento3.miscs.dev';
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// Static asset types to cache aggressively
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const STATIC_EXTENSIONS = [
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'.css', '.js', '.jpg', '.jpeg', '.png', '.gif', '.ico',
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'.woff', '.woff2', '.ttf', '.svg', '.webp', '.json',
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];
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// Cache names
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const STATIC_CACHE = 'ao3-static-v1';
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const HTML_CACHE = 'ao3-html-v1';
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// Navigation timeout (25s, like go3)
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const NAV_FETCH_TIMEOUT_MS = 25000;
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// ─── Helpers ──────────────────────────────────────────────────────────
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function primaryMirrorHost() {
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try {
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var scopeHost = new URL(self.registration.scope).hostname;
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if (scopeHost && scopeHost.indexOf('.') !== -1) return scopeHost;
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} catch (e) {}
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for (var i = 0; i < MIRROR_DOMAINS.length; i++) {
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var h = MIRROR_DOMAINS[i];
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if (h && h.indexOf('.') !== -1) return h;
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}
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return PRIMARY_DOMAIN;
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}
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function isStaticAsset(url) {
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var path = url.pathname.toLowerCase();
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for (var i = 0; i < STATIC_EXTENSIONS.length; i++) {
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if (path.endsWith(STATIC_EXTENSIONS[i])) return true;
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}
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return false;
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}
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function hostFromRequest(request) {
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try {
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return new URL(request.url).hostname || '';
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} catch (e) {
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return '';
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}
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}
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function repairNavigationURL(url) {
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var host = url.hostname;
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if (!host || host.indexOf('.') !== -1 || host === 'localhost') return url;
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var mirror = primaryMirrorHost();
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if (!mirror) return url;
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var fixed = new URL(url.toString());
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fixed.hostname = mirror;
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fixed.pathname = '/' + host + (fixed.pathname || '/');
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return fixed;
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}
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// ─── Offline / mirror picker page ─────────────────────────────────────
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function buildMirrorPickerPage(currentHost, mirrors) {
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var mirrorItems = mirrors
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.filter(function (h) { return h; })
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.map(function (h) {
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return '<li><a href="https://' + h + '/' + '">' + h + '</a></li>';
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})
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.join('');
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return (
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'<!doctype html><html lang="zh-CN"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>无法访问镜像站点</title>' +
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'<style>' +
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'body{margin:0;background:#f6f6f6;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#222}' +
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'.wrap{max-width:680px;margin:40px auto;padding:0 16px}' +
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'.card{background:#fff;border:1px solid #e5e5e5;border-radius:12px;padding:24px 28px;box-shadow:0 6px 20px rgba(0,0,0,.05)}' +
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'h1{margin:0 0 8px;color:#860000;font-size:22px}' +
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'.lead{color:#555;line-height:1.6;margin:0 0 20px}' +
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'.steps{margin:0;padding:0;list-style:none}' +
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'.steps>li{margin:0 0 20px;padding:0 0 20px;border-bottom:1px solid #eee}' +
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'.steps>li:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none}' +
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'.step-title{display:flex;align-items:flex-start;gap:10px;font-weight:600;color:#333;margin:0 0 8px;line-height:1.5}' +
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'.step-num{flex-shrink:0;width:26px;height:26px;border-radius:50%;background:#860000;color:#fff;font-size:14px;line-height:26px;text-align:center}' +
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'.step-body{color:#555;line-height:1.65;margin:0;font-size:15px}' +
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'.mirrors{margin:8px 0 0;padding-left:20px}' +
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'.mirrors li{margin:8px 0}' +
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'a{color:#900;text-decoration:none;font-weight:500}a:hover{text-decoration:underline}' +
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'code{background:#f3f3f3;padding:2px 6px;border-radius:4px;font-size:.92em}' +
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'.muted{color:#888;font-size:13px;line-height:1.6;margin-top:20px;padding-top:16px;border-top:1px solid #eee}' +
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'</style></head><body><div class="wrap"><div class="card">' +
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'<h1>无法连接到镜像站点</h1>' +
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'<p class="lead">浏览器未能与 <code>' + currentHost + '</code> 建立网络连接（例如断网、DNS 失败或被防火墙拦截）。请按下面顺序逐步排查。</p>' +
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'<ol class="steps">' +
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'<li><p class="step-title"><span class="step-num">1</span><span>先检查网络连接</span></p>' +
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'<p class="step-body">确认设备已联网：可尝试打开其他网站或 App。若使用 Wi‑Fi，请检查路由器是否正常。</p></li>' +
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'<li><p class="step-title"><span class="step-num">2</span><span>尝试切换到移动流量</span></p>' +
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'<p class="step-body">部分宽带或校园网可能对镜像域名有限制。请关闭 Wi‑Fi，使用手机 <strong>4G / 5G 流量</strong> 重新访问。</p></li>' +
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'<li><p class="step-title"><span class="step-num">3</span><span>尝试备用域名</span></p>' +
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'<p class="step-body">点击下方备用镜像站点：</p>' +
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'<ul class="mirrors">' + mirrorItems + '</ul></li>' +
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'</ol>' +
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'<p class="muted">页面由 AO3 Mirror Service Worker 提供。若以上步骤后仍无法打开，请稍后再试。</p>' +
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'</div></div></body></html>'
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);
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}
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function offlineGuideResponse(currentHost) {
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return new Response(buildMirrorPickerPage(currentHost, MIRROR_DOMAINS), {
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status: 200,
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headers: {
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'Content-Type': 'text/html; charset=utf-8',
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'Cache-Control': 'no-store',
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},
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});
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}
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// ─── Network strategies ───────────────────────────────────────────────
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function handleNavigation(request) {
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var currentHost = hostFromRequest(request);
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var url = new URL(request.url);
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// Repair malformed navigation URLs
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var navUrl = repairNavigationURL(url);
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var fetchInit = {};
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if (navUrl.href !== request.url) {
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fetchInit = {
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method: request.method,
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headers: request.headers,
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credentials: request.credentials,
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redirect: 'follow',
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referrer: request.referrer,
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referrerPolicy: request.referrerPolicy,
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};
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}
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var ctrl = new AbortController();
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var timer = setTimeout(function () { ctrl.abort(); }, NAV_FETCH_TIMEOUT_MS);
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var fetchTarget = navUrl.href !== request.url ? new Request(navUrl.href, fetchInit) : request;
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return fetch(fetchTarget, { signal: ctrl.signal })
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.finally(function () { clearTimeout(timer); })
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.then(function (response) {
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if (response.redirected && response.url) {
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return Response.redirect(response.url, 302);
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}
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return response;
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})
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.catch(function () {
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return offlineGuideResponse(currentHost);
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});
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}
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function handleStatic(request) {
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// Cache-first for static assets
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return caches.open(STATIC_CACHE).then(function (cache) {
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return cache.match(request).then(function (cached) {
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if (cached) {
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// Background revalidation
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fetch(request).then(function (response) {
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if (response && response.ok) {
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cache.put(request, response);
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}
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}).catch(function () {});
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return cached;
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}
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// Network with cache fallback
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return fetch(request).then(function (response) {
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if (response && response.ok) {
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var cloned = response.clone();
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cache.put(request, cloned);
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}
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return response;
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}).catch(function () {
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// Offline — return whatever we have
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return cache.match(request);
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});
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});
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});
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}
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// ─── Install / Activate ───────────────────────────────────────────────
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self.addEventListener('install', function (event) {
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self.skipWaiting();
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});
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self.addEventListener('activate', function (event) {
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event.waitUntil(self.clients.claim());
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// Clean old caches
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event.waitUntil(
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caches.keys().then(function (keys) {
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return Promise.all(
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keys.map(function (key) {
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if (key !== STATIC_CACHE && key !== HTML_CACHE) {
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return caches.delete(key);
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}
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})
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);
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})
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);
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});
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// ─── Fetch handler ────────────────────────────────────────────────────
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self.addEventListener('fetch', function (event) {
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if (event.request.method !== 'GET') return;
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var url = new URL(event.request.url);
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// Don't intercept SW or monitor paths
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if (url.pathname.startsWith('/sw') || url.pathname === '/mirror-domains.json') return;
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if (url.pathname === '/_monitor' || url.pathname.startsWith('/_monitor/')) return;
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if (url.pathname === '/stats' || url.pathname === '/metrics' || url.pathname === '/health') return;
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// Static assets: cache-first
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if (isStaticAsset(url)) {
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event.respondWith(handleStatic(event.request));
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return;
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}
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// Navigation (HTML pages): network-first with offline fallback
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if (event.request.mode === 'navigate' || event.request.destination === 'document') {
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event.respondWith(
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handleNavigation(event.request).catch(function () {
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return offlineGuideResponse(hostFromRequest(event.request));
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})
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);
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}
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// Other requests pass through to server normally
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});
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