index.js

// taken from https://spectrum.chat/thread/3d15e59b-a893-494a-b8a8-a8cc391094d6
const {send} = require('micro')

const axios = require('axios')

const fs = require('fs')

const sharp = require('sharp')

const memoize = require('memoizee')

const querystring = require('querystring')

const parseUrl = (url) => {

  console.log('url', url)

  const [path, query] = url.split('?', 2)

  const queryObj = querystring.parse(query)

  return {url:`${process.env.BASE_URL || 'http://www.gamersunite.com'}${path}`, resizeWidth:queryObj.w}

}

const fetchImage = async (requestUrl)=>{

  const {url, resizeWidth} = parseUrl(requestUrl)

  const response = await axios({method:'get', url, responseType:'arraybuffer'})

  console.log('resizeWidth',parseInt(resizeWidth,10), resizeWidth)

  const buffer = await sharp(response.data).resize(parseInt(resizeWidth,10)).jpeg().toBuffer()

  return buffer

}

const mFetchImage = memoize(fetchImage, 1, {primitive:true, promise: true, max:1000, maxAge:1000*60*60*24})

module.exports = async (req, res) => {

  if (req.url.endsWith('.ico')) {

    return send(res, 404)

  }

  try {

    const buffer = await mFetchImage(req.url)

    res.setHeader('Content-Type', 'image/jpeg')

    res.write(buffer)

    res.end()

  }

  catch(e) {

    console.error('err', e.status, req.url)

    return send(res, e.status)
  }
}