traefik/download-file.js

> Traefik (pronounced traffic) is a modern HTTP reverse proxy and load balancer that makes deploying microservices easy

const { parse } = require("url")
const http = require("follow-redirects").https
const fs = require("fs")
const { basename } = require("path")

const TIMEOUT = 10000

module.exports = function (url, path) {
  const uri = parse(url)
  if (!path) {
    path = basename(uri.path)
  }
  const file = fs.createWriteStream(path)

  return new Promise(function (resolve, reject) {
    const request = http.get(uri.href).on("response", function (res) {
      const len = parseInt(res.headers["content-length"], 10)
      let downloaded = 0
      let percent = 0
      res
        .on("data", function (chunk) {
          file.write(chunk)
          downloaded += chunk.length
          percent = ((100.0 * downloaded) / len).toFixed(2)
          process.stdout.write(`Downloading ${percent}% ${downloaded} bytes\r`)
        })
        .on("end", function () {
          file.end()
          console.log(`${uri.path} downloaded to: ${path}`)
          resolve()
        })
        .on("error", function (err) {
          reject(err)
        })
    })
    request.setTimeout(TIMEOUT, function () {
      request.abort()
      reject(new Error(`request timeout after ${TIMEOUT / 1000.0}s`))
    })
  })
}