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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| 'use strict' | ||
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| /** | ||
| * static files (404.html, sw.js, conf.js) | ||
| */ | ||
| const ASSET_URL = 'https://hunshcn.github.io/gh-proxy' | ||
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| /** @type {RequestInit} */ | ||
| const PREFLIGHT_INIT = { | ||
| status: 204, | ||
| headers: new Headers({ | ||
| 'access-control-allow-origin': '*', | ||
| 'access-control-allow-methods': 'GET,POST,PUT,PATCH,TRACE,DELETE,HEAD,OPTIONS', | ||
| 'access-control-max-age': '1728000', | ||
| }), | ||
| } | ||
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| /** | ||
| * @param {any} body | ||
| * @param {number} status | ||
| * @param {Object<string, string>} headers | ||
| */ | ||
| function makeRes(body, status = 200, headers = {}) { | ||
| headers['access-control-allow-origin'] = '*' | ||
| return new Response(body, {status, headers}) | ||
| } | ||
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||
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| /** | ||
| * @param {string} urlStr | ||
| */ | ||
| function newUrl(urlStr) { | ||
| try { | ||
| return new URL(urlStr) | ||
| } catch (err) { | ||
| return null | ||
| } | ||
| } | ||
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| addEventListener('fetch', e => { | ||
| const ret = fetchHandler(e) | ||
| .catch(err => makeRes('cfworker error:\n' + err.stack, 502)) | ||
| e.respondWith(ret) | ||
| }) | ||
|
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||
|
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| /** | ||
| * @param {FetchEvent} e | ||
| */ | ||
| async function fetchHandler(e) { | ||
| const req = e.request | ||
| const urlStr = req.url | ||
| const urlObj = new URL(urlStr) | ||
| let path = urlObj.searchParams.get('q') | ||
| if(path) | ||
| { | ||
| return Response.redirect('https://' + urlObj.host + '/' + path, 301) | ||
| } | ||
| // cfworker 会把路径中的 `//` 合并成 `/` | ||
| path = urlObj.href.substr(urlObj.origin.length + 1).replace(/^https?:\/+/, 'https://') | ||
| const exp = /^(?:https?:\/\/)?github\.com\/.+?\/.+?\/(?:releases|archive|info|git-upload-pack).*$/ | ||
| const exp2 = /^(?:https?:\/\/)?github\.com\/.+?\/.+?\/(?:blob)\/.*$/ | ||
| if (path.search(exp)===0) { | ||
| return httpHandler(req, path) | ||
| }else if(path.search(exp2)===0){ | ||
| const newUrl = path.replace('/blob/', '@').replace(/^(?:https?:\/\/)?github\.com/, 'https://cdn.jsdelivr.net/gh') | ||
| return Response.redirect(newUrl, 302) | ||
| } else { | ||
| return fetch(ASSET_URL + path) | ||
| } | ||
| } | ||
|
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||
|
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| /** | ||
| * @param {Request} req | ||
| * @param {string} pathname | ||
| */ | ||
| function httpHandler(req, pathname) { | ||
| const reqHdrRaw = req.headers | ||
|
|
||
| // preflight | ||
| if (req.method === 'OPTIONS' && | ||
| reqHdrRaw.has('access-control-request-headers') | ||
| ) { | ||
| return new Response(null, PREFLIGHT_INIT) | ||
| } | ||
|
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| let rawLen = '' | ||
|
|
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| const reqHdrNew = new Headers(reqHdrRaw) | ||
|
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| const refer = reqHdrNew.get('referer') | ||
|
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| let urlStr = pathname | ||
| if (urlStr.startsWith('github')) { | ||
| urlStr = 'https://' + urlStr | ||
| } | ||
| const urlObj = newUrl(urlStr) | ||
|
|
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| /** @type {RequestInit} */ | ||
| const reqInit = { | ||
| method: req.method, | ||
| headers: reqHdrNew, | ||
| redirect: 'follow', | ||
| body: req.body | ||
| } | ||
| return proxy(urlObj, reqInit, rawLen, 0) | ||
| } | ||
|
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||
|
|
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| /** | ||
| * | ||
| * @param {URL} urlObj | ||
| * @param {RequestInit} reqInit | ||
| */ | ||
| async function proxy(urlObj, reqInit, rawLen) { | ||
| const res = await fetch(urlObj.href, reqInit) | ||
| const resHdrOld = res.headers | ||
| const resHdrNew = new Headers(resHdrOld) | ||
|
|
||
| // verify | ||
| if (rawLen) { | ||
| const newLen = resHdrOld.get('content-length') || '' | ||
| const badLen = (rawLen !== newLen) | ||
|
|
||
| if (badLen) { | ||
| return makeRes(res.body, 400, { | ||
| '--error': `bad len: ${newLen}, except: ${rawLen}`, | ||
| 'access-control-expose-headers': '--error', | ||
| }) | ||
| } | ||
| } | ||
| const status = res.status | ||
| resHdrNew.set('access-control-expose-headers', '*') | ||
| resHdrNew.set('access-control-allow-origin', '*') | ||
|
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| resHdrNew.delete('content-security-policy') | ||
| resHdrNew.delete('content-security-policy-report-only') | ||
| resHdrNew.delete('clear-site-data') | ||
|
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| return new Response(res.body, { | ||
| status, | ||
| headers: resHdrNew, | ||
| }) | ||
| } | ||
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|