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"use strict";const OFFLINE_DATA_FILE="offline.json",CACHE_NAME_PREFIX="c3offline",BROADCASTCHANNEL_NAME="offline",CONSOLE_PREFIX="[SW] ",LAZYLOAD_KEYNAME="",broadcastChannel="undefined"==typeof BroadcastChannel?null:new BroadcastChannel(BROADCASTCHANNEL_NAME);class PromiseThrottle{constructor(e){this._maxParallel=e,this._queue=[],this._activeCount=0}Add(a){return new Promise((e,t)=>{this._queue.push({func:a,resolve:e,reject:t}),this._MaybeStartNext()})}async _MaybeStartNext(){if(this._queue.length&&!(this._activeCount>=this._maxParallel)){this._activeCount++;const t=this._queue.shift();try{const e=await t.func();t.resolve(e)}catch(e){t.reject(e)}this._activeCount--,this._MaybeStartNext()}}}const networkThrottle=new PromiseThrottle(20);function PostBroadcastMessage(e){broadcastChannel&&setTimeout(()=>broadcastChannel.postMessage(e),3e3)}function Broadcast(e){PostBroadcastMessage({"type":e})}function BroadcastDownloadingUpdate(e){PostBroadcastMessage({"type":"downloading-update","version":e})}function BroadcastUpdateReady(e){PostBroadcastMessage({"type":"update-ready","version":e})}function IsUrlInLazyLoadList(e,t){if(t)try{for(const a of t)if(new RegExp(a).test(e))return!0}catch(e){console.error(CONSOLE_PREFIX+"Error matching in lazy-load list: ",e)}return!1}function WriteLazyLoadListToStorage(e){return"undefined"==typeof localforage?Promise.resolve():localforage.setItem(LAZYLOAD_KEYNAME,e)}function ReadLazyLoadListFromStorage(){return"undefined"==typeof localforage?Promise.resolve([]):localforage.getItem(LAZYLOAD_KEYNAME)}function GetCacheBaseName(){return CACHE_NAME_PREFIX+"-"+self.registration.scope}function GetCacheVersionName(e){return GetCacheBaseName()+"-v"+e}async function GetAvailableCacheNames(){const e=await caches.keys(),t=GetCacheBaseName();return e.filter(e=>e.startsWith(t))}async function IsUpdatePending(){const e=await GetAvailableCacheNames();return 2<=e.length}async function GetMainPageUrl(){const e=await clients.matchAll({includeUncontrolled:!0,type:"window"});for(const t of e){let e=t.url;if((e=e.startsWith(self.registration.scope)?e.substring(self.registration.scope.length):e)&&"/"!==e)return e=e.startsWith("?")?"/"+e:e}return""}function fetchWithBypass(e,t){return"string"==typeof e&&(e=new Request(e)),t?fetch(e.url,{headers:e.headers,mode:e.mode,credentials:e.credentials,redirect:e.redirect,cache:"no-store"}):fetch(e)}async function CreateCacheFromFileList(t,a,o){const e=await Promise.all(a.map(e=>networkThrottle.Add(()=>fetchWithBypass(e,o))));let s=!0;for(const r of e)r.ok||(s=!1,console.error(CONSOLE_PREFIX+"Error fetching '"+r.url+"' ("+r.status+" "+r.statusText+")"));if(!s)throw new Error("not all resources were fetched successfully");const n=await caches.open(t);try{return await Promise.all(e.map((e,t)=>n.put(a[t],e)))}catch(e){throw console.error(CONSOLE_PREFIX+"Error writing cache entries: ",e),caches.delete(t),e}}async function UpdateCheck(e){try{const t=await fetchWithBypass(OFFLINE_DATA_FILE,!0);if(!t.ok)throw new Error(OFFLINE_DATA_FILE+" responded with "+t.status+" "+t.statusText);const a=await t.json(),o=a.version,s=a.fileList,n=a.lazyLoad,r=GetCacheVersionName(o),i=await caches.has(r);if(i){const c=await IsUpdatePending();void(c?(console.log(CONSOLE_PREFIX+"Update pending"),Broadcast("update-pending")):(console.log(CONSOLE_PREFIX+"Up to date"),Broadcast("up-to-date")))}else{const l=await GetMainPageUrl(),d=(s.unshift("./"),l&&-1===s.indexOf(l)&&s.unshift(l),console.log(CONSOLE_PREFIX+"Caching "+s.length+" files for offline use"),e?Broadcast("downloading"):BroadcastDownloadingUpdate(o),n&&await WriteLazyLoadListToStorage(n),await CreateCacheFromFileList(r,s,!e),await IsUpdatePending());d?(console.log(CONSOLE_PREFIX+"All resources saved, update ready"),BroadcastUpdateReady(o)):(console.log(CONSOLE_PREFIX+"All resources saved, offline support ready"),Broadcast("offline-ready"))}}catch(e){console.warn(CONSOLE_PREFIX+"Update check failed: ",e)}}async function GetCacheNameToUse(e,t){if(1===e.length||!t)return e[0];const a=await clients.matchAll();if(1<a.length)return e[0];const o=e[e.length-1];return console.log(CONSOLE_PREFIX+"Updating to new version"),await Promise.all(e.slice(0,-1).map(e=>caches.delete(e))),o}async function HandleFetch(t,e){const a=await GetAvailableCacheNames();if(!a.length)return fetch(t.request);const o=await GetCacheNameToUse(a,e),s=await caches.open(o),n=await s.match(t.request);if(n)return n;const r=await Promise.all([fetch(t.request),ReadLazyLoadListFromStorage()]),i=r[0],c=r[1];if(IsUrlInLazyLoadList(t.request.url,c))try{await s.put(t.request,i.clone())}catch(e){console.warn(CONSOLE_PREFIX+"Error caching '"+t.request.url+"': ",e)}return i}self.addEventListener("install",e=>{e.waitUntil(UpdateCheck(!0).catch(()=>null))}),self.addEventListener("fetch",e=>{if(new URL(e.request.url).origin===location.origin){const t="navigate"===e.request.mode,a=HandleFetch(e,t);t&&e.waitUntil(a.then(()=>UpdateCheck(!1))),e.respondWith(a)}});
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