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Sign up| /* =========================================================== | |
| * docsify sw.js | |
| * =========================================================== | |
| * Copyright 2016 @huxpro | |
| * Licensed under Apache 2.0 | |
| * Register service worker. | |
| * ========================================================== */ | |
| const RUNTIME = 'docsify' | |
| const HOSTNAME_WHITELIST = [ | |
| self.location.hostname, | |
| 'fonts.gstatic.com', | |
| 'fonts.googleapis.com', | |
| 'unpkg.com' | |
| ] | |
| // The Util Function to hack URLs of intercepted requests | |
| const getFixedUrl = (req) => { | |
| var now = Date.now() | |
| var url = new URL(req.url) | |
| // 1. fixed http URL | |
| // Just keep syncing with location.protocol | |
| // fetch(httpURL) belongs to active mixed content. | |
| // And fetch(httpRequest) is not supported yet. | |
| url.protocol = self.location.protocol | |
| // 2. add query for caching-busting. | |
| // Github Pages served with Cache-Control: max-age=600 | |
| // max-age on mutable content is error-prone, with SW life of bugs can even extend. | |
| // Until cache mode of Fetch API landed, we have to workaround cache-busting with query string. | |
| // Cache-Control-Bug: https://bugs.chromium.org/p/chromium/issues/detail?id=453190 | |
| if (url.hostname === self.location.hostname) { | |
| url.search += (url.search ? '&' : '?') + 'cache-bust=' + now | |
| } | |
| return url.href | |
| } | |
| /** | |
| * @Lifecycle Activate | |
| * New one activated when old isnt being used. | |
| * | |
| * waitUntil(): activating ====> activated | |
| */ | |
| self.addEventListener('activate', event => { | |
| event.waitUntil(self.clients.claim()) | |
| }) | |
| /** | |
| * @Functional Fetch | |
| * All network requests are being intercepted here. | |
| * | |
| * void respondWith(Promise<Response> r) | |
| */ | |
| self.addEventListener('fetch', event => { | |
| // Skip some of cross-origin requests, like those for Google Analytics. | |
| if (HOSTNAME_WHITELIST.indexOf(new URL(event.request.url).hostname) > -1) { | |
| // Stale-while-revalidate | |
| // similar to HTTP's stale-while-revalidate: https://www.mnot.net/blog/2007/12/12/stale | |
| // Upgrade from Jake's to Surma's: https://gist.github.com/surma/eb441223daaedf880801ad80006389f1 | |
| const cached = caches.match(event.request) | |
| const fixedUrl = getFixedUrl(event.request) | |
| const fetched = fetch(fixedUrl, { cache: 'no-store' }) | |
| const fetchedCopy = fetched.then(resp => resp.clone()) | |
| // Call respondWith() with whatever we get first. | |
| // If the fetch fails (e.g disconnected), wait for the cache. | |
| // If there’s nothing in cache, wait for the fetch. | |
| // If neither yields a response, return offline pages. | |
| event.respondWith( | |
| Promise.race([fetched.catch(_ => cached), cached]) | |
| .then(resp => resp || fetched) | |
| .catch(_ => { /* eat any errors */ }) | |
| ) | |
| // Update the cache with the version we fetched (only for ok status) | |
| event.waitUntil( | |
| Promise.all([fetchedCopy, caches.open(RUNTIME)]) | |
| .then(([response, cache]) => response.ok && cache.put(event.request, response)) | |
| .catch(_ => { /* eat any errors */ }) | |
| ) | |
| } | |
| }) |