Telegram Web K with changes to work inside I2P
https://web.telegram.i2p/
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49 lines
1.5 KiB
49 lines
1.5 KiB
/* |
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* https://github.com/morethanwords/tweb |
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* Copyright (C) 2019-2021 Eduard Kuzmenko |
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* https://github.com/morethanwords/tweb/blob/master/LICENSE |
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*/ |
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import { pause } from "../../helpers/schedulers/pause"; |
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const ctx = self as any as ServiceWorkerGlobalScope; |
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export const CACHE_ASSETS_NAME = 'cachedAssets'; |
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function isCorrectResponse(response: Response) { |
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return response.ok && response.status === 200; |
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} |
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function timeoutRace<T extends Promise<any>>(promise: T) { |
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return Promise.race([ |
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promise, |
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pause(10000).then(() => Promise.reject()) |
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]); |
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} |
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export async function requestCache(event: FetchEvent) { |
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try { |
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// const cache = await ctx.caches.open(CACHE_ASSETS_NAME); |
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const cache = await timeoutRace(ctx.caches.open(CACHE_ASSETS_NAME)); |
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const file = await timeoutRace(cache.match(event.request, {ignoreVary: true})); |
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if(file && isCorrectResponse(file)) { |
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return file; |
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} |
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const headers: HeadersInit = {'Vary': '*'}; |
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let response = await fetch(event.request, {headers}); |
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if(isCorrectResponse(response)) { |
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cache.put(event.request, response.clone()); |
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} else if(response.status === 304) { // possible fix for 304 in Safari |
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const url = event.request.url.replace(/\?.+$/, '') + '?' + (Math.random() * 100000 | 0); |
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response = await fetch(url, {headers}); |
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if(isCorrectResponse(response)) { |
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cache.put(event.request, response.clone()); |
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} |
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} |
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return response; |
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} catch(err) { |
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return fetch(event.request); |
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} |
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}
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