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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| var version = 'v16::'; | ||
|
|
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| self.addEventListener("install", function(event) { | ||
| event.waitUntil(() => { | ||
| self.skipWaiting(); | ||
| }); | ||
| }); | ||
|
|
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| self.addEventListener("fetch", function(event) { | ||
| let fetchResponse = (async () => { | ||
| return new Promise((resolve, reject) => { | ||
| if (event.request.method !== 'GET') { | ||
| // Handle other requests such as POST here | ||
| return; | ||
| } | ||
| let url = event.request.url.split("#")[0]; | ||
| let requestInit = indexedDB.open("tAppCache", 5); | ||
| let db; | ||
| function myFetch(page) { | ||
| return new Promise((resolve, reject) => { | ||
| fetch(page).then((response) => { | ||
| resolve(response); | ||
| }).catch(() => { | ||
| resolve(new Response("", { | ||
| status: 500, | ||
| statusText: 'Service Unavailable', | ||
| headers: new Headers({ | ||
| 'Content-Type': 'text/html' | ||
| }) | ||
| })); | ||
| }); | ||
| }); | ||
| } | ||
| requestInit.onupgradeneeded = function() { | ||
| db = requestInit.result; | ||
| if(!db.objectStoreNames.contains("cachedPages")) { | ||
| db.createObjectStore("cachedPages"); | ||
| } | ||
| if(!db.objectStoreNames.contains("offlineStorage")) { | ||
| db.createObjectStore("offlineStorage"); | ||
| } | ||
| } | ||
| requestInit.onsuccess = async function() { | ||
| db = requestInit.result; | ||
| function setCachedPage(fullPath, value) { | ||
| return new Promise((resolve, reject) => { | ||
| let request = db.transaction(["cachedPages"], "readwrite").objectStore("cachedPages").put(value, fullPath); | ||
| request.onerror = () => { | ||
| reject("tAppError: Persistent caching is not available in this browser."); | ||
| }; | ||
| request.onsuccess = () => { | ||
| resolve(true); | ||
| } | ||
| }); | ||
| } | ||
| function getCachedPage(fullPath) { | ||
| return new Promise((resolve, reject) => { | ||
| let request = db.transaction(["cachedPages"], "readwrite").objectStore("cachedPages").get(fullPath); | ||
| request.onerror = (err) => { | ||
| myFetch(url).then((response) => { | ||
| resolve(response); | ||
| }); | ||
| }; | ||
| request.onsuccess = () => { | ||
| myFetch(url).then((response) => { | ||
| if(response.status === 200) { | ||
| response.text().then((text) => { | ||
|
|
||
| setCachedPage(url, { | ||
| data: text, | ||
| cachedAt: new Date().getTime() | ||
| }); | ||
| }).catch(() => { | ||
|
|
||
| }); | ||
| } | ||
| }); | ||
| if(request.result != null) { | ||
| resolve(new Response(request.result.data, { | ||
| status: 200, | ||
| statusText: 'OK', | ||
| headers: new Headers({ | ||
| 'Content-Type': 'text/html' | ||
| }) | ||
| })); | ||
| } else { | ||
| myFetch(url).then((response) => { | ||
| resolve(response); | ||
| }); | ||
| } | ||
| }; | ||
| }); | ||
| } | ||
| getCachedPage(url).then((response) => { | ||
| resolve(response); | ||
| }); | ||
| }; | ||
| requestInit.onerror = (err) => { | ||
| myFetch(url).then((response) => { | ||
| resolve(response); | ||
| }); | ||
| } | ||
| }); | ||
| })(); | ||
| event.respondWith(fetchResponse); | ||
| }); | ||
|
|
||
| self.addEventListener("activate", function(event) { | ||
| event.waitUntil(() => { | ||
|
|
||
| }); | ||
| }); |
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