|
|
|
|
|
/* ===========================================================
|
|
|
|
|
|
* 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 */
|
|
|
|
|
|
}),
|
|
|
|
|
|
)
|
|
|
|
|
|
}
|
|
|
|
|
|
})
|
