export interface Env { CODE_SOURCE_URL_ROOT: string; } export default { async fetch(request: Request, env: Env, ctx: ExecutionContext): Promise { const url = new URL(request.url); if (url.pathname == '/favicon.ico') { const cacheKey = new Request(request.url); const cachedResponse = await caches.default.match(cacheKey); if (!cachedResponse) { const res = await fetch('https://workers.cloudflare.com/favicon.ico'); const favicon = new Response(res.body, { headers: { 'Cache-Control': 's-maxage=86400', 'Content-Type': res.headers.get('Content-Type') || 'image/vnd.microsoft.icon', }, }) ctx.waitUntil(caches.default.put(cacheKey, favicon.clone())); return favicon; } return cachedResponse; } const PATH_PREFIX = '/chn-domains-list/'; // strip path prefix if (url.pathname.startsWith(PATH_PREFIX)) { url.pathname = url.pathname.slice(PATH_PREFIX.length - 1); } if (url.pathname.slice(1) == 'main/worker.ts' || url.pathname.slice(1) == 'alternative/worker.ts') { if (!env.CODE_SOURCE_URL_ROOT) { return new Response('Environment variable `CODE_SOURCE_URL_ROOT` is not set.', {status: 404}); } try { const r = await fetch(env.CODE_SOURCE_URL_ROOT + url.pathname.slice(1)); return new Response(r.body, { headers: {'Content-Type': 'text/plain; charset=utf-8'}, }); } catch (e) { return new Response('Failed to fetch source code.', {status: 400}); } } const UPSTREAM_SOURCES_ROOT = 'https://raw.githubusercontent.com/felixonmars/dnsmasq-china-list/master/'; const NAME_ALIAS: {[s: string]: string} = { 'CHN': 'accelerated-domains.china', 'CHN.GOOG': 'google.china', 'CHN.AAPL': 'apple.china', 'CHN.ALL': 'all', } const availableNames = Object.values(NAME_ALIAS).concat(Object.keys(NAME_ALIAS)); const availableSuffixes = ['.conf', '.hosts', '.txt', '.list']; if (url.pathname == '/') { const listItems = []; for (const k of Object.keys(NAME_ALIAS)) { for (const f of availableSuffixes) { const pathname = `${NAME_ALIAS[k]}${f}`; const pathnameAlias = `${k}${f}`; listItems.push(`

${pathname} (alias: ${pathnameAlias})

`); } } return new Response(` CHN Domains List

CHN Domains List

Inspired by chn-domains-list, using felixonmars's dnsmasq-china-list as upstream.

Avaliable resources:

${listItems.join('')} `, { headers: { 'Content-Type': 'text/html; encoding=utf-8', }, }); } // extracting name and suffix part from pathname const pathnameLastDotPos = url.pathname.lastIndexOf('.'); const _name = pathnameLastDotPos != -1 ? url.pathname.slice(1, pathnameLastDotPos) : url.pathname.slice(1); const name = NAME_ALIAS[_name] ?? _name; const suffix = pathnameLastDotPos != -1 ? url.pathname.slice(pathnameLastDotPos) : ''; // generating cache key from normalized url const cacheKey = new Request(new URL(name + suffix, url.origin), request); const cachedResponse = await caches.default.match(cacheKey); // not returning from cache if 'noCache' presents (regardless of its value) if (url.searchParams.get('noCache') == null && cachedResponse) { return cachedResponse; } // filtering illegal requests const messages = []; if (availableNames.indexOf(name) == -1) { messages.push(`Unsupported resource name: "${_name}".\n Available resources are: "${availableNames.join('", "')}".`); } if (availableSuffixes.indexOf(suffix) == -1) { messages.push(`Unsupported suffix: "${suffix}".\n Available suffixes are: "${availableSuffixes.join('", "')}".`); } if (messages.length > 0) { return new Response(messages.join('\n\n'), {status: 400}); } const servers: string[][] = []; // fetching from upstream for (const n of ( name == 'all' ? ['accelerated-domains.china', 'apple.china', 'google.china'] : [name] )) { const src = await fetch(`${UPSTREAM_SOURCES_ROOT}${n}.conf`); const text = await src.text(); // pre-processing response servers.push( text .split('\n') .filter(i => i.startsWith('server')) .map(m => m.slice(m.indexOf('/') + 1, m.lastIndexOf('/'))) ); } // generating response for one of the formats (determined by suffix) const headers = new Headers({ 'Cache-Control': 's-maxage=86400', 'Content-Type': 'text/plain; charset=utf-8', }); // helper function for putting a response into cache function putCache(response: Response) { ctx.waitUntil(caches.default.put(cacheKey, response.clone())); return response; } // handle resource generating for different formats (suffixes) switch (suffix) { case '.txt': return putCache(new Response(servers.flat().join('\n'), {headers})); case '.conf': { return putCache(new Response( servers.flat().map(n => `DOMAIN-SUFFIX,${n}\n`).join(''), { headers }, )); } case '.list': { return putCache(new Response(servers.flat().map(n => `.${n}\n`).join(''), {headers})); } case '.hosts': { return putCache(new Response( '[Host]\n\n' + servers.flat().map(n => `${n} = server:system\n` + `+.${n} = server:system\n`).join(''), { headers }, )); } default: return new Response('never'); } }, };