CDN开源

index.js

addEventListener("fetch", event => {
  event.respondWith(handleRequest(event))
})

const BUCKET_NAME = "lbr77/CDN@main"
const BUCKET_URL = `http://cdn.jsdelivr.net/gh/${BUCKET_NAME}`

async function serveAsset(event) {
  const url = new URL(event.request.url)
  const cache = caches.default
  let response = await cache.match(event.request)

  if (!response) {
    response = await fetch(`${BUCKET_URL}${url.pathname}`)
    const headers = { "cache-control": "public, max-age=14400"}
    response = new Response(response.body, { ...response, headers })
    event.waitUntil(cache.put(event.request, response.clone()))
  }
  return response
}

async function handleRequest(event) {
  if (event.request.method === "GET") {
    let url = new URL(event.request.url);
    if (url.pathname === "/") {
      return Response.redirect("https://github.com/lbr77/CDN", 301)
    }
    else if (url.pathname.startsWith("/pixiv")) {
      url.hostname = "i.pximg.net";
      url.pathname = url.pathname.slice("6");
      let request = new Request(url, event.request);
      let response = await fetch(request, {
        headers: {
          'Referer': 'https://www.pixiv.net/',
          'User-Agent': 'Cloudflare Workers'
        }
      });
      const headers = { "cache-control": "public, max-age=14400" }
      response = new Response(response.body, { ...response, headers })
      // event.waitUntil(cache.put(event.request, response.clone()))
      return response
    }
    let response = await serveAsset(event)
    if (response.status > 399) {
      response = new Response(response.statusText, { status: response.status })
    }
    return response
  } else {
    return new Response("Method not allowed", { status: 405 })
  }
}