Script for reliably downloading binaries (e.g. Xcode) from Apple's CDN

xcode-downloader.rb

#!/usr/bin/env ruby

print "What is the URL of your Apple Downloads resource?\nURL:"
url = gets.strip

print "What is the ADCDownloadAuth cookie token:\nADCDownloadAuth: "
token = gets.strip

command = "aria2c --header \"Host: adcdownload.apple.com\" --header \"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\" --header \"Upgrade-Insecure-Requests: 1\" --header \"Cookie: ADCDownloadAuth=#{token}\" --header \"User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 10_1 like Mac OS X) AppleWebKit/602.2.14 (KHTML, like Gecko) Version/10.0 Mobile/14B72 Safari/602.1\" --header \"Accept-Language: en-us\" -x 16 -s 16 #{url} -d ~/Downloads"

exec(command)

Steps to download xcode with resume functionality

1- Install View Cookies extension for firefox.
2- Copy script Ian Dundas save asdownload_xcode.rb
3-Edit the script
4- Open firefox, then open https://developer.apple.com/download/
5- Log in with apple id account
6- Click Download then click save File
7- Show all downloads on firefox, then on xcode download process, right click, copy download link. This is my https://download.developer.apple.com/Developer_Tools/Xcode_9_beta_5/Xcode_9_beta_5.xip link.
8- Run the script download_xcode.rb
9- Will be asked to enter the download link, paste the link earlier.
then it will be prompted to enter a cookie ADCDownloadAuth
10- Go back to page https://developer.apple.com/download/ then press cmd+ i, go to Cookies tab
11- Search cookie named ADCDownloadAuthand copy valueit
Done, the download will start with resume support.