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02e22f4017
Former-commit-id: f1539e92838e1140679ef920b6371b9d391af69c [formerly c84baa55075fee51ebb721d6b6696370d3abbeb8] [formerly 9ed81811e74619df1adb92c12a50d37915eadb92 [formerly 98a92a3da0]]
Former-commit-id: d84ec2952d31bd0bd1242be89487dd7b58db2749 [formerly 4cadf618b95922326d41a20d565d7e063afc1045]
Former-commit-id: 8bdba61ef5e95c8662ca27c0964ad9d91b3e8e8c
56 lines
2.3 KiB
JavaScript
56 lines
2.3 KiB
JavaScript
(function() {
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'use strict';
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// Check to make sure service workers are supported in the current browser,
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// and that the current page is accessed from a secure origin. Using a
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// service worker from an insecure origin will trigger JS console errors.
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const isLocalhost = Boolean(window.location.hostname === 'localhost' ||
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// [::1] is the IPv6 localhost address.
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window.location.hostname === '[::1]' ||
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// 127.0.0.1/8 is considered localhost for IPv4.
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window.location.hostname.match(
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/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
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)
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);
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window.addEventListener('load', function() {
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if ('serviceWorker' in navigator &&
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(window.location.protocol === 'https:' || isLocalhost)) {
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navigator.serviceWorker.register('{{ .BaseURL }}/_/service-worker.js')
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.then(function(registration) {
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// updatefound is fired if service-worker.js changes.
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registration.onupdatefound = function() {
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// updatefound is also fired the very first time the SW is installed,
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// and there's no need to prompt for a reload at that point.
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// So check here to see if the page is already controlled,
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// i.e. whether there's an existing service worker.
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if (navigator.serviceWorker.controller) {
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// The updatefound event implies that registration.installing is set
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const installingWorker = registration.installing;
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installingWorker.onstatechange = function() {
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switch (installingWorker.state) {
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case 'installed':
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// At this point, the old content will have been purged and the
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// fresh content will have been added to the cache.
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// It's the perfect time to display a "New content is
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// available; please refresh." message in the page's interface.
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break;
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case 'redundant':
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throw new Error('The installing ' +
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'service worker became redundant.');
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default:
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// Ignore
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}
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};
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}
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};
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}).catch(function(e) {
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console.error('Error during service worker registration:', e);
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});
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}
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});
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})();
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