mirror of https://github.com/moparisthebest/mail
Tankred Hase
8 years ago
5 changed files with 185 additions and 31 deletions
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/** |
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* Copyright 2015 Google Inc. All rights reserved. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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'use strict'; |
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var UPDATE_MSG = 'A new version of Whiteout Mail is available. Restart the app to update?'; |
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if ('serviceWorker' in navigator && |
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// See http://www.chromium.org/Home/chromium-security/prefer-secure-origins-for-powerful-new-features
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(window.location.protocol === 'https:' || |
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window.location.hostname === 'localhost' || |
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window.location.hostname.indexOf('127.') === 0)) { |
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// prefer new service worker cache
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useServiceWorker(); |
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} else if ('applicationCache' in window) { |
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// Fall back to app cache
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useAppCache(); |
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} |
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function useServiceWorker() { |
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// Your service-worker.js *must* be located at the top-level directory relative to your site.
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// It won't be able to control pages unless it's located at the same level or higher than them.
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// *Don't* register service worker file in, e.g., a scripts/ sub-directory!
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// See https://github.com/slightlyoff/ServiceWorker/issues/468
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navigator.serviceWorker.register('service-worker.js', { |
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scope: './' |
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}).then(function(registration) { |
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// Check to see if there's an updated version of service-worker.js with new files to cache:
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// https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#service-worker-registration-update-method
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if (typeof registration.update === 'function') { |
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registration.update(); |
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} |
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// updatefound is fired if service-worker.js changes.
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registration.onupdatefound = function() { |
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// The updatefound event implies that registration.installing is set; see
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// https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#service-worker-container-updatefound-event
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var 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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if (navigator.serviceWorker.controller) { |
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// At this point, the old content will have been purged and the fresh content will
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// have been added to the cache.
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// It's the perfect time to display a "New content is available; please refresh."
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// message in the page's interface.
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console.log('New or updated content is available.'); |
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if (window.confirm(UPDATE_MSG)) { |
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window.location.reload(); |
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} |
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} else { |
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// At this point, everything has been precached, but the service worker is not
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// controlling the page. The service worker will not take control until the next
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// reload or navigation to a page under the registered scope.
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// It's the perfect time to display a "Content is cached for offline use." message.
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console.log('Content is cached, and will be available for offline use the ' + |
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'next time the page is loaded.'); |
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} |
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break; |
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case 'redundant': |
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throw 'The installing service worker became redundant.'; |
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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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function useAppCache() { |
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window.onload = function() { |
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// Check if a new AppCache is available on page load.
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window.applicationCache.onupdateready = function() { |
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if (window.applicationCache.status === window.applicationCache.UPDATEREADY) { |
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// Browser downloaded a new app cache
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if (window.confirm(UPDATE_MSG)) { |
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window.location.reload(); |
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} |
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} |
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}; |
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}; |
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} |
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