worker_template.js

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

async function handleRequest(event) {
  const path = new URL(event.request.url).pathname.substr(1)

  let status = 200
  const headers = {
    'Content-Type': 'text/html; charset=utf-8',
  }
  let content = ''

  if (path in versions.content) {
    headers['Content-Type'] = 'text/javascript'
    headers['Access-Control-Allow-Origin'] = '*'
    headers['Cache-Control'] = 'max-age=' + (60 * 60 * 24 * 30)
    content = versions.content[path]

    if (Math.random() <= config.logRequestRate) {
      event.waitUntil(logRequest(event.request, path))
    }
  }
  else if (path in scripts) {
    headers['Content-Type'] = 'text/javascript'
    headers['Cache-Control'] = 'max-age=60'
    content = scripts[path]
  }
  else if (`page__${pagePath(path)}__content` in pages) {
    headers['Cache-Control'] = 'max-age=5'
    content = generatePage(path)
  }
  else if (path == 'favicon.ico') {
    headers['Content-Type'] = 'image/png'
    content = (await fetch('https://cdnstats.instant.page/favicon.ico')).body
  }
  else if (path == 'twitter_summary_image_v2.png') {
    headers['Content-Type'] = 'image/png'
    content = (await fetch('https://cdnstats.instant.page/twitter_summary_image_v2.png')).body
  }
  else if (/\.(png|svg|jpg|gif|ico)$/.test(path)) {
    const response = await fetch(`https://assets.instant.page/${path}`)
    return response
  }
  else {
    status = 404
    content = `404 page not found<br><a href="/">home page</a>`
  }

  event.waitUntil(getGithubStars())

  return new Response(content, {
    status,
    headers,
  })
}

const versions = {}

versions.latest = __VERSIONS_LATEST__

versions.hashes = {}

__VERSIONS_HASHES__

versions.content = {}

__VERSIONS_CONTENT__

const scripts = {}

__SCRIPTS__

const getStylesheet = () => __STYLESHEET__

const pages = {}

__PAGES__

__GENERATE_PAGE__

const config = __CONFIG__

let githubStars
let githubStarsLastFetch = 0

async function getGithubStars() {
  if (+new Date - githubStarsLastFetch < 60 * 60 * 1000) {
    return
  }
  githubStarsLastFetch = +new Date
  const response = await fetch(`https://api.github.com/repos/instantpage/instant.page`, {
    headers: {
      'User-Agent': 'instantpage',
      'Authorization': `Bearer ${config.githubAccessToken}`,
    }
  })
  const json = await response.json()
  githubStars = json.stargazers_count
}

async function logRequest(request, version) {
  const key = encodeURIComponent(config.serversidestatsKey)
  const method = encodeURIComponent(request.method)
  const host = encodeURIComponent(request.headers.get("referer") && new URL(request.headers.get("referer")).host || '')
  const userAgent = encodeURIComponent(request.headers.get("user-agent"))
  const country = encodeURIComponent(request.headers.get("cf-ipcountry"))
  const protocol = new URL(request.url).protocol
  const tlsVersion = request.cf.tlsVersion

  await fetch(`https://cdnstats.instant.page/?key=${key}&method=${method}&protocol=${protocol}&host=${host}&versionNumber=${version}&userAgent=${userAgent}&country=${country}&tlsVersion=${tlsVersion}`)
}