index.js

const app = require('express')();
const jimp = require('jimp');
const axios = require('axios');
const cheerio = require('cheerio');
const https = require('https');
const fs = require('fs');

app.get('/', (req, res) => {
  res.send('it works');
});

app.get('/github-pro/:id', async (req, res) => {
  const { params: { id }} = req;

  const profileUrl = `https://github.com/${id}`;

  console.log(id);

  const originalFilePath = `${id}.jpeg`;
  const resultFilePath = `${id}_result.jpeg`;

  if (fs.existsSync(resultFilePath)) {
    res.download(resultFilePath, 'result.jpeg');
  } else {

    try {
      const { status: profileStatus, data: profileHtml } = await axios.get(profileUrl);

      const $ = cheerio.load(profileHtml);
      const imgUrl = $('a.u-photo.d-block').attr('href');

      const { status: imageStatus, data: imageRaw } = await axios.get(imgUrl, { responseType: 'arraybuffer' });

      fs.writeFileSync(originalFilePath, imageRaw);

    } catch (err) {
      console.log(err);
    }

    Promise.all([
      jimp.read(`${id}.jpeg`),
      jimp.read('pro_banner.png')
    ])
      .then(([profileImage, banner]) => {
        profileImage.resize(400, 400).composite(banner, 0, 300);
        return profileImage.writeAsync(resultFilePath);
      })
      .then(() => {
        res.download(resultFilePath, 'result.jpeg');
      })
      .catch(console.log);
  }
});

app.listen(4000);