who is home?

whoishome.rb

require 'rest-client'
require 'json'

=begin
Endpoint url must return something like this:
[
    {
        "name": "television-sony",
        "mac": "00:11:22:33:44:55",
        "display": false
    },
    ...
    
    {
        "name": "macbook",
        "mac": "AA:BB:CC:DD:EE:FF",
        "display": true
    }
=end

def stored_devices
  mac_devices_stored = {}

  begin
    mac_devices_file_content = RestClient.get(
      'https://myendpoint.withjson.hosts.com'
    )
    mac_devices_stored = JSON.parse(mac_devices_file_content)
  rescue => e
  end

  mac_devices_stored
end

def active_devices
  scan_cmd = `arp-scan --retry=8 --ignoredups -I en0 --localnet`
  output_lines = scan_cmd.split("\n")

  active_mac_list = []

  address_lines = output_lines.slice(2, output_lines.size - 5)

  address_lines.each do |line|
    address_data = line.split("\t")
    active_mac_list.push(address_data)
  end

  active_mac_list
end

def inclues_mac(address_list, mac_address)
  address_list.each do |address|
    if address == mac_address
      return true
    end
  end

  return false
end

puts 'downloading MAC list...'
devices_stored_list = stored_devices

puts 'scanning the network...'
devices_found = active_devices

devices_found.each do |device|
  is_saved = false
  should_display = true
  devices_stored_list.each do |stored_device|
    if device[1].upcase == stored_device['mac'].upcase
      is_saved = true
      should_display = stored_device['display']

      if should_display
        puts "#{device[0]}\t#{device[1]}\t#{stored_device['name']}"
      end
    end
  end

  unless is_saved
    puts "#{device[0]}\t#{device[1]}\t#{device[2]}\t(not saved)"
  end
end