Scrape aws' region json file to write out us-east-1 ip ranges for Ansible/iptables

rangifier.rb

require "json"
require "yaml"
require "net/http"
require "uri"

yaml_file = "#{Dir.pwd}/range.yml"

uri = URI.parse("https://ip-ranges.amazonaws.com/ip-ranges.json")

http = Net::HTTP.new(uri.host, uri.port)
request = Net::HTTP::Get.new(uri.request_uri)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE

response = http.request(request)

if response.code == "200"
  result = JSON.parse(response.body)
  ranges = []
  result["prefixes"].each do |doc|
    if doc["region"] && doc["region"] == "us-east-1"
      ranges << doc["ip_prefix"]
    end
  end
  File.open(yaml_file, 'w') {|f| f.write ranges.to_yaml }
else
  puts "ERROR!!!"
end