Created
May 11, 2021 08:59
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const BASE_DOMAIN = "" | |
addEventListener('fetch', function (event) { | |
const { request } = event | |
const response = handleRequest(request).catch(handleError) | |
event.respondWith(response) | |
}) | |
/** | |
* Receives a HTTP request and replies with a response. | |
* @param {Request} request | |
* @returns {Promise<Response>} | |
*/ | |
async function handleRequest(request) { | |
const { method, url } = request | |
const { host, pathname } = new URL(url) | |
let matchStatus = -1 | |
// https://gist.github.com/BexTuychiev/ad0b1318a392691a74666fd34171afb2.js | |
const reMatchJS = /\/(.*)\/(.*).js$/ | |
// https://github.githubassets.com/assets/gist-embed-ceaaa09008a5bc2758b9ee6a1c99082d.css | |
const reMatchCssAssets = /\/assets\/(.*)/ | |
if(reMatchJS.test(pathname)) matchStatus = 1; | |
if(reMatchCssAssets.test(pathname)) matchStatus = 2; | |
console.log(pathname, matchStatus, reMatchJS.test(pathname)) | |
switch (matchStatus) { | |
case 1: | |
return await proxyJS(pathname); | |
case 2: | |
return await proxyCSS(pathname); | |
default: | |
return new Response(`Not match path ${pathname}. \nPlease check it`, {status: 409}) | |
} | |
} | |
async function proxyJS(pathname) { | |
console.log('proxy js') | |
const base = "https://gist.github.com" | |
return await fetchContent(base, pathname, true, 'github.githubassets.com', BASE_DOMAIN) | |
} | |
async function proxyCSS(pathname) { | |
console.log('proxy css') | |
const base = "https://github.githubassets.com" | |
return await fetchContent(base, pathname) | |
} | |
async function fetchContent(base, pathname, isReplace = false, re, reContent) { | |
const url = base + pathname | |
const myRequest = new Request(url) | |
const proxyData = await fetch(myRequest) | |
const { status, statusText, body} = proxyData | |
if(status != 200) return new Response('Error From Github: ' + statusText, {status: status}) | |
if(isReplace) { | |
let originText = await proxyData.text() | |
originText = originText.replace(re,reContent); | |
return new Response(originText, {status: 200}) | |
} else { | |
return new Response(body, {status: 200}) | |
} | |
} |
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