52 lines
1.6 KiB
JavaScript
52 lines
1.6 KiB
JavaScript
// the cache version gets updated every time there is a new deployment
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const CACHE_VERSION = 1
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const CURRENT_CACHE = `lnbits-${CACHE_VERSION}-`
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const getApiKey = request => {
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return request.headers.get('X-Api-Key') || 'none'
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}
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// on activation we clean up the previously registered service workers
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self.addEventListener('activate', evt =>
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evt.waitUntil(
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caches.keys().then(cacheNames => {
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return Promise.all(
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cacheNames.map(cacheName => {
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const currentCacheVersion = cacheName.split('-').slice(-2, 2)
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if (currentCacheVersion !== CACHE_VERSION) {
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return caches.delete(cacheName)
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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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// The fetch handler serves responses for same-origin resources from a cache.
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// If no response is found, it populates the runtime cache with the response
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// from the network before returning it to the page.
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self.addEventListener('fetch', event => {
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// Skip cross-origin requests, like those for Google Analytics.
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if (
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event.request.url.startsWith(self.location.origin) &&
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event.request.method == 'GET'
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) {
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// Open the cache
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event.respondWith(
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caches.open(CURRENT_CACHE + getApiKey(event.request)).then(cache => {
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// Go to the network first
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return fetch(event.request)
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.then(fetchedResponse => {
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cache.put(event.request, fetchedResponse.clone())
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return fetchedResponse
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})
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.catch(() => {
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// If the network is unavailable, get
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return cache.match(event.request.url)
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})
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})
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)
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}
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})
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