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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| /* =========================================================== | ||
| * 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', | ||
| 'cdn.jsdelivr.net' | ||
| ] | ||
|
|
||
| // 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 */ }) | ||
| ) | ||
| } | ||
| }) |