geo-mirror

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/**
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 * getArchMirror
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 * @param {string} country
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 * @returns Promise<string>
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 */
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export async function getArchMirror(country) {
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    const src = await fetch('https://archlinux.org/mirrorlist/?ip_version=4', {
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		  cf: {
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				cacheTtl: 3600, // 1 hour
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				cacheEverything: true
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			}
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		}).then(r => r.text())
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    const re = /Server = (https?:\/\/.*)\/\$repo\/os\/\$arch/g
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    const mirrors = {}
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    let match
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    while (match = re.exec(src)) {
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        const url = new URL(match[1])
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        const tld = url.hostname.split('.').pop()
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        mirrors[tld] = url.toString()
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    }
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    if (country.toLowerCase() in mirrors) {
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      return mirrors[country.toLowerCase()]
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    } else {
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      return 'https://geo.mirror.pkgbuild.com'
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    }
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}
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/**
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 * getDebianMirror
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 * @param {string} country
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 * @returns Promise<string>
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 */
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export function getDebianMirror(country) {
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    return Promise.resolve(`https://ftp.${country.toLowerCase()}.debian.org`)
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}
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/**
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 * getUbuntuMirror
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 * @param {string} country
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 * @returns Promise<string>
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 */
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export function getUbuntuMirror(country) {
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  return Promise.resolve(`https://${country.toLowerCase()}.archive.ubuntu.com`)
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}
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export default {
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  /**
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   * fetch
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   * @param {Request} request
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   * @returns {Promise<Response>}
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   */
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  async fetch(request) {
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    const url = new URL(request.url);
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    const country = /** @type {string} */ (request.cf.country);
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    const pathname =url.pathname.split('/').slice(2).join('/')
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    if (url.pathname.startsWith('/archlinux')) {
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      const redirect = `${await getArchMirror(country)}/${pathname}`
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      return Response.redirect(redirect);
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    }
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    if (url.pathname.startsWith('/ubuntu')) {
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      const redirect = `${await getUbuntuMirror(country)}/${pathname}`
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      return Response.redirect(redirect)
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    }
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    if (url.pathname.startsWith('/debian')) {
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      const redirect = `${await getDebianMirror(country)}/${pathname}`
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      return Response.redirect(redirect);
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    }
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		return Response.redirect('https://github.com/tani/geo-mirror')
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  }
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};
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