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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/pagefind-entry.json','/js/pagefind-highlight.js','/js/pagefind-modular-ui.css','/js/pagefind-modular-ui.js','/js/pagefind-ui.css','/js/pagefind-ui.js','/js/pagefind.en_88e373ea1f.pf_meta','/js/pagefind.es_7556d6166a.pf_meta','/js/pagefind.fr_b34dd2c23f.pf_meta','/js/pagefind.index.js','/js/pagefind.js','/js/pagefind.search.js','/js/prestyle.js','/js/search.js','/js/searchChange.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','/js/wasm.en.pagefind','/js/wasm.es.pagefind','/js/wasm.fr.pagefind','/js/wasm.unknown.pagefind','/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/','/js/fragment/en_1ee6ca2.pf_fragment','/js/fragment/en_4162c19.pf_fragment','/js/fragment/en_539c351.pf_fragment','/js/fragment/en_53cb76b.pf_fragment','/js/fragment/en_58ea47d.pf_fragment','/js/fragment/en_5ad7d88.pf_fragment','/js/fragment/en_607247b.pf_fragment','/js/fragment/en_76e147a.pf_fragment','/js/fragment/en_85c365d.pf_fragment','/js/fragment/en_8ddff26.pf_fragment','/js/fragment/en_b06ecdf.pf_fragment','/js/fragment/en_b37b30a.pf_fragment','/js/fragment/en_d3f49b7.pf_fragment','/js/fragment/en_eec2257.pf_fragment','/js/fragment/en_f847339.pf_fragment','/js/fragment/es_82b6e6e.pf_fragment','/js/fragment/es_8da16fd.pf_fragment','/js/fragment/fr_1e151a9.pf_fragment','/js/fragment/fr_4a39af5.pf_fragment','/js/fragment/fr_77f673c.pf_fragment','/js/fragment/fr_98dac9a.pf_fragment','/js/fragment/fr_a1cd89a.pf_fragment','/js/fragment/fr_b77cf83.pf_fragment','/js/fragment/fr_c2595bc.pf_fragment','/js/fragment/fr_db31d0d.pf_fragment','/js/fragment/fr_e048281.pf_fragment','/js/fragment/fr_f05ab69.pf_fragment','/js/fragment/fr_f13f76f.pf_fragment','/js/index/en_e9d5746.pf_index','/js/index/es_29a1d7e.pf_index','/js/index/fr_2799aab.pf_index','/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();
|
