aws_certificate_dns_validation.rb

# It can take up to several hours for ACM to validate the domain name and issue the certificate
# so better be sure it's working.

require 'csv'
require 'resolv'
 
res = open("DNS_Configuration.csv") # Export DNS configuration to a file 
row = CSV.new(res.read, headers: true).first

expected = row["Record Value"].delete_suffix('.')
url = row["Record Name"].delete_suffix('.')

puts "LOOKUP: #{url}"

record = Resolv::DNS.open do |dns|
  dns.getresource(url, Resolv::DNS::Resource::IN::CNAME)
end

value = record.name.to_s

if value == expected
  puts "Successful! Let's wait for AWS to validate it!"
else
  puts "Failed! Expected #{value.inspect} to be #{expected.inspect}"
end