class Pwa { constructor(self) { this.scope = self; const Version = new URL(location).searchParams.get("v"); this.CACHE_VERSION = Version; //this.BASE_CACHE_FILES=['/js/theme.min.js','/js/theme_light.min.js','/abridge.css','/js/abridge.min.js','/','/404.html','/offline/','/manifest.json']; this.BASE_CACHE_FILES = ['/404.html','/_headers','/abridge.css','/android-chrome-192x192.png','/android-chrome-512x512.png','/apple-touch-icon.png','/atom.xml','/banner.png','/browserconfig.xml','/elasticlunr.min.js','/favicon-16x16.png','/favicon-32x32.png','/favicon.ico','/favicon.svg','/','/katex.min.css','/m1024.png','/m128.png','/m192.png','/m384.png','/m48.png','/m512.png','/m72.png','/m96.png','/manifest.json','/manifest.min.json','/mstile-150x150.png','/nojs.css','/robots.txt','/safari-pinned-tab.svg','/search_index.en.json','/search_index.es.json','/search_index.fr.json','/sitemap.xml','/about/','/archive/','/blog/','/contact/','/es/atom.xml','/es/','/fonts/KaTeX_AMS-Regular.woff2','/fonts/KaTeX_Caligraphic-Bold.woff2','/fonts/KaTeX_Caligraphic-Regular.woff2','/fonts/KaTeX_Fraktur-Bold.woff2','/fonts/KaTeX_Fraktur-Regular.woff2','/fonts/KaTeX_Main-Bold.woff2','/fonts/KaTeX_Main-BoldItalic.woff2','/fonts/KaTeX_Main-Italic.woff2','/fonts/KaTeX_Main-Regular.woff2','/fonts/KaTeX_Math-BoldItalic.woff2','/fonts/KaTeX_Math-Italic.woff2','/fonts/KaTeX_SansSerif-Bold.woff2','/fonts/KaTeX_SansSerif-Italic.woff2','/fonts/KaTeX_SansSerif-Regular.woff2','/fonts/KaTeX_Script-Regular.woff2','/fonts/KaTeX_Size1-Regular.woff2','/fonts/KaTeX_Size2-Regular.woff2','/fonts/KaTeX_Size3-Regular.woff2','/fonts/KaTeX_Size4-Regular.woff2','/fonts/KaTeX_Typewriter-Regular.woff2','/fonts/Roboto-Bold.woff2','/fonts/Roboto-Italic.woff2','/fonts/Roboto-Mono-Italic.woff2','/fonts/Roboto-Mono.woff2','/fonts/Roboto.woff2','/fr/atom.xml','/fr/','/images/ferris-gesture.svg','/images/ferris.svg','/js/abridge.min.js','/js/abridge_nopwa.min.js','/js/abridge_nosearch.min.js','/js/abridge_nosearch_nopwa.min.js','/js/codecopy.js','/js/elasticlunr.min.js','/js/email.js','/js/katex-auto-render.min.js','/js/katex.min.js','/js/katexbundle.min.js','/js/katexbundle.min.old.js','/js/katexoptions.js','/js/lunr.da.js','/js/lunr.da.min.js','/js/lunr.de.js','/js/lunr.de.min.js','/js/lunr.du.js','/js/lunr.du.min.js','/js/lunr.es.js','/js/lunr.es.min.js','/js/lunr.fi.js','/js/lunr.fi.min.js','/js/lunr.fr.js','/js/lunr.fr.min.js','/js/lunr.hu.js','/js/lunr.hu.min.js','/js/lunr.it.js','/js/lunr.it.min.js','/js/lunr.jp.js','/js/lunr.jp.min.js','/js/lunr.no.js','/js/lunr.no.min.js','/js/lunr.pt.js','/js/lunr.pt.min.js','/js/lunr.ro.js','/js/lunr.ro.min.js','/js/lunr.ru.js','/js/lunr.ru.min.js','/js/lunr.stemmer.support.js','/js/lunr.stemmer.support.min.js','/js/lunr.sv.js','/js/lunr.sv.min.js','/js/lunr.tr.js','/js/lunr.tr.min.js','/js/lunr.zh.js','/js/lunr.zh.min.js','/js/mathtex-script-type.min.js','/js/prestyle.js','/js/search.js','/js/search_elasticlunr.min.js','/js/search_elasticlunr_jindex.min.js','/js/search_stork.min.js','/js/search_tinysearch.min.js','/js/searchjava.js','/js/searchjavaugly.js','/js/stork.js','/js/stork_config.js','/js/sw_load.js','/js/sw_load.min.js','/js/theme.js','/js/theme.min.js','/js/theme_button.js','/js/theme_light.js','/js/theme_light.min.js','/js/tinysearch.js','/offline/','/overview-abridge/','/overview-abridge/lighthouse.png','/overview-code-blocks/','/overview-images/corro.svg','/overview-images/ferris-gesture.png','/overview-images/ferris-gesture.svg','/overview-images/ferris-happy.svg','/overview-images/ferris.svg','/overview-images/','/overview-markdown-and-style/','/overview-math/','/overview-rich-content/','/overview-rich-content/over9000-400.avif','/overview-rich-content/over9000-640.avif','/overview-rich-content/over9000-640.webp','/overview-rich-content/over9000-960.avif','/overview-rich-content/over9000.mp3','/overview-rich-content/over9000.ogg','/overview-rich-content/over9000_av1.mp4','/overview-rich-content/over9000_vp9.webm','/overview-showdata/','/privacy/','/tags/','/es/archive/','/es/blog/','/es/tags/','/fr/about/','/fr/archive/','/fr/blog/','/fr/contact/','/fr/offline/','/fr/overview-abridge/','/fr/overview-abridge/lighthouse.png','/fr/overview-code-blocks/','/fr/overview-images/corro.svg','/fr/overview-images/ferris-gesture.png','/fr/overview-images/ferris-gesture.svg','/fr/overview-images/ferris-happy.svg','/fr/overview-images/ferris.svg','/fr/overview-images/','/fr/overview-markdown-and-style/','/fr/overview-math/','/fr/overview-rich-content/','/fr/overview-rich-content/over9000-400.avif','/fr/overview-rich-content/over9000-640.avif','/fr/overview-rich-content/over9000-640.webp','/fr/overview-rich-content/over9000-960.avif','/fr/overview-rich-content/over9000.mp3','/fr/overview-rich-content/over9000.ogg','/fr/overview-rich-content/over9000_av1.mp4','/fr/overview-rich-content/over9000_vp9.webm','/fr/overview-showdata/','/fr/privacy/','/fr/tags/','/overview-images/img/ferris-gesture.svg','/overview-images/img/ferris.svg','/page/1/','/page/2/','/page/3/','/page/4/','/tags/audio/atom.xml','/tags/audio/','/tags/config/atom.xml','/tags/config/','/tags/data/atom.xml','/tags/data/','/tags/features/atom.xml','/tags/features/','/tags/images/atom.xml','/tags/images/','/tags/markdown/atom.xml','/tags/markdown/','/tags/mathematics/atom.xml','/tags/mathematics/','/tags/shortcodes/atom.xml','/tags/shortcodes/','/tags/video/atom.xml','/tags/video/','/video-streaming-sites/overview-embed-streamable/','/video-streaming-sites/overview-embed-vimeo/','/video-streaming-sites/overview-embed-youtube/','/blog/page/1/','/es/page/1/','/es/tags/features/atom.xml','/es/tags/features/','/es/tags/shortcodes/atom.xml','/es/tags/shortcodes/','/es/tags/video/atom.xml','/es/tags/video/','/es/video-streaming-sites/overview-embed-streamable/','/fr/overview-images/img/ferris-gesture.svg','/fr/overview-images/img/ferris.svg','/fr/page/1/','/fr/page/2/','/fr/page/3/','/fr/page/4/','/fr/tags/audio/atom.xml','/fr/tags/audio/','/fr/tags/config/atom.xml','/fr/tags/config/','/fr/tags/data/atom.xml','/fr/tags/data/','/fr/tags/features/atom.xml','/fr/tags/features/','/fr/tags/images/atom.xml','/fr/tags/images/','/fr/tags/markdown/atom.xml','/fr/tags/markdown/','/fr/tags/mathematics/atom.xml','/fr/tags/mathematics/','/fr/tags/shortcodes/atom.xml','/fr/tags/shortcodes/','/fr/tags/video/atom.xml','/fr/tags/video/','/fr/video-streaming-sites/overview-embed-streamable/','/fr/video-streaming-sites/overview-embed-vimeo/','/fr/video-streaming-sites/overview-embed-youtube/','/es/blog/page/1/','/fr/blog/page/1/']; this.host = `${self.location.protocol}//${self.location.host}`; console.info(`Host: ${this.host}`); this.OFFLINE_PAGE = '/offline/'; this.NOT_FOUND_PAGE = '/404.html'; this.CACHE_NAME = `content-v${this.CACHE_VERSION}`; // 3600=1hour, 28800=8hours, 86400=1day, 604800=1week, 1209600=2weeks this.NORM_TTL = 0; this.LONG_TTL = 0; // keep the ttl on these lower: this.TTL_NORM = ["sw.min.js", "sw_load.min.js"]; // rarely change, may be a good idea to periodically refresh, incase I change these and forget to increment service worker version: this.TTL_LONG = ["jpg", "jpeg", "png", "gif", "webp", "avif", "ico", "svg", "xsl", "txt"]; // never change, cache forever unless service worker version is incremented: this.TTL_EXEMPT = ["js", "css", "otf", "eot", "ttf", "woff", "woff2", "mp4", "webm", "mp3", "ogg"]; // skip these extensions so they expire same time as html: st,wasm,json(search), xml(sitemap,atom,rss) } canCache(url) { if (url.startsWith("http://localhost")) { return false; } const result = url.toString().startsWith(this.host); return result; } getFileExtension(url) { const extension = url.split('.').reverse()[0].split('?')[0]; return (extension.endsWith('/')) ? '/' : extension; } getFileName(url) { const filename = url.substring(url.lastIndexOf('/') + 1).split('?')[0]; return (filename.endsWith('/')) ? '/' : filename; } getTTL(url) { if (typeof url === 'string') { const extension = this.getFileExtension(url); const filename = this.getFileName(url); if (this.TTL_NORM.indexOf(filename) > -1) { console.info(url + ' contains a TTL_NORM filename'); return this.NORM_TTL; } if (this.TTL_LONG.indexOf(extension) > -1) { console.info(url + ' contains a TTL_LONG extension'); return this.LONG_TTL; } if (this.TTL_EXEMPT.indexOf(extension) > -1) { console.info(url + ' contains a TTL_EXEMPT extension'); return null; } console.info(url + ' TTL_NORM'); return this.NORM_TTL; } return null; } async installServiceWorker() { try { await caches.open(this.CACHE_NAME).then((cache) => { return cache.addAll(this.BASE_CACHE_FILES); }, err => console.error(`Error with ${this.CACHE_NAME}`, err)); return this.scope.skipWaiting(); } catch (err) { return console.error("Error with installation: ", err); } } cleanupLegacyCache() { const currentCaches = [this.CACHE_NAME]; return new Promise( (resolve, reject) => { caches.keys() .then((keys) => keys.filter((key) => !~currentCaches.indexOf(key))) .then((legacy) => { if (legacy.length) { Promise.all(legacy.map((legacyKey) => caches.delete(legacyKey)) ).then(() => resolve()).catch((err) => { console.error("Error in legacy cleanup: ", err); reject(err); }); } else { resolve(); } }).catch((err) => { console.error("Error in legacy cleanup: ", err); reject(err); }); }); } async preCacheUrl(url) { const cache = await caches.open(this.CACHE_NAME); const response = await cache.match(url); if (!response) { return fetch(url).then(resp => cache.put(url, resp.clone())); } return null; } register() { this.scope.addEventListener('install', event => { event.waitUntil( Promise.all([ this.installServiceWorker(), this.scope.skipWaiting(), ])); console.info('SW Installed'); }); this.scope.addEventListener('activate', event => { event.waitUntil(Promise.all( [this.cleanupLegacyCache(), this.scope.clients.claim(), this.scope.skipWaiting()]).catch((err) => { console.error("Activation error: ", err); event.skipWaiting(); })); }); this.scope.addEventListener('fetch', event => { event.respondWith( caches.open(this.CACHE_NAME).then(async cache => { // check if this is NOT a resource we allow cacheing (some other domain), if so fetch it instead of cache. if (!this.canCache(event.request.url)) { return fetch(event.request); } // check the cache for the requested resource const response = await cache.match(event.request); if (response) { const headers = response.headers.entries(); let date = null; for (let pair of headers) { if (pair[0] === 'date') { date = new Date(pair[1]); break; } } // date is not working, so ignore TTL and just serve the cached resource. if (!date) { return response; } const age = parseInt(((new Date().getTime() - date.getTime()) / 1000).toString()); const ttl = this.getTTL(event.request.url); if (ttl === null || (ttl && age < ttl)) { // return the resource if it is not beyond the TTL return response; } } // if we made it here then we either did not have the cache, or the TTL was expired. return fetch(event.request.clone()).then(resp => { if (resp.status < 400) { if (this.canCache(event.request.url)) { cache.put(event.request, resp.clone()); } return resp; } else { return cache.match(this.NOT_FOUND_PAGE); } }).catch(err => { // if we made it here then we were unable to fetch the resource. // maybe we were only fetching because of expired TTL, so use the cache regardless of TTL: if (typeof event.request.url === 'string') { console.info("url: "+event.request.url) } if (response) { return response; } // if we made it here then we were unable to fetch the resource and do not have it cached. console.error(`Error fetching ${event.request.url} resulted in offline`, err); return cache.match(this.OFFLINE_PAGE); }) })); }); } } const pwa = new Pwa(self); pwa.register();