PTB-be/controller/dokumen.controller.js

const chunkModel = require('../model/chunk.model')
const handleError = require('../utils/handleError')

exports.getDokumen = handleError(async (req, res) => {
  const { id } = req.params
  const data = await chunkModel.findById(id)
  res.header('Content-Type', data.type)
  return res.end(Buffer.from(data.data))
})