Open NordVPN easiliy via cli with country as argument and checking for newest server files

.nord_vpn_auth

youremail
yourpassword

open_nord_vpn.rb

#!/usr/bin/env ruby

# usage (here with usa as example): ruby open_nord_vpn.rb us

require 'tmpdir'
require 'digest'

class NordVPNConnection

  attr_accessor :country

  def initialize(country)
    self.country = country
    ensure_nordvpn_dir_exists
    ensure_checksumfile_exists
    check_if_new_servers_are_available_and_update_config_files_if_so if update_required?
    open_nordvpn_connection
  end

  private

  def open_nordvpn_connection
    tmp_file = "#{File.expand_path('~')}/.nordvpn.ovpn"
    # copy config to tmp file
    `cat #{openvpn_file} > #{tmp_file}`
    # implement auth
    open('.nordvpn.ovpn', 'a') { |f| f.puts "auth-user-pass #{File.expand_path('~')}/.nord_vpn_auth" }
    # open vpn
    exec("sudo openvpn #{tmp_file}")
  end

  def checksumfile
    "#{Dir.home}\/.nordvpn_checksum"
  end

  def nordvpn_vpn_dir
    "#{Dir.home}\/.nordvpn"
  end

  def openvpn_file
    # use a random server
    @openvpn_file ||= `find #{nordvpn_vpn_dir} | grep "^#{nordvpn_vpn_dir}\/ovpn_udp\/#{country}.*\.udp"`.lines.sample(1).first.strip
  end

  def ensure_nordvpn_dir_exists
    `mkdir -p #{nordvpn_vpn_dir}`
  end

  def ensure_checksumfile_exists
    File.write(checksumfile, '') unless File.file?(checksumfile)
  end

  def age_in_days
    (Time.now.to_i - File.mtime(checksumfile).to_i).to_f / (60*60*24)
  end

  def check_if_new_servers_are_available_and_update_config_files_if_so
    # download openvpn files: https://nordvpn.com/tutorials/linux/openvpn/
    puts "Checking for updates…"
    Dir.mktmpdir do |dir|
      filepath = "#{dir}/ovpn.zip"
      `curl -s https://downloads.nordcdn.com/configs/archives/servers/ovpn.zip > #{filepath}`
      checksum = Digest::SHA256.file(filepath)
      return if checksum == File.read(checksumfile)
      puts "Updating…"
      File.write(checksumfile, checksum)
      `rm -rf #{nordvpn_vpn_dir}`
      `mkdir -p #{nordvpn_vpn_dir}`
      `unzip #{filepath} -d #{nordvpn_vpn_dir}`
    end
  end

  def update_required?
    age_in_days > 6 || Dir[File.join(nordvpn_vpn_dir, '**', '*')].count <= 0
  end

end

NordVPNConnection.new(ARGV.first || 'ch')