Route53 To Terraform

route532tf

#!/usr/bin/env ruby
#
# Converts a Route53 Zone file into corresponding Terraform resources using pure Ruby, no deps required.
# See usage for more information.

require "json"
require "erb"
require "logger"

Log = Logger.new(STDERR)
Log.level = Logger::ERROR

filename = ARGV[0]
zone_id  = ARGV[1]

def convert(filename, zone_id)

  begin
    Log.info("Loading #{filename}...")
    file = File.read(filename)
    zone_json = JSON.parse(file)
  rescue => e
    Log.error("Error loading file #{filename}: #{e}")
  end

  for rs in zone_json['ResourceRecordSets']
    alias_target = rs.has_key?("AliasTarget")

    if alias_target
      as = rs["AliasTarget"] if alias_target
    else
      resource_records = rs["ResourceRecords"].map { |v| v["Value"] }
    end

    template =  ERB.new <<-EOF
    resource "aws_route53_record" "#{rs['Name'].gsub('.', '_')[0..-2]}" {
      zone_id = "#{zone_id}"
      name    = "#{rs['Name']}"
      type    = "#{rs['Type']}"
      <% if resource_records %>records = #{resource_records} <% end %>
      <% if alias_target %>
      alias {
        name                    = "#{as["DNSName"]}"
        zone_id                 = "#{as["HostedZoneId"]}"
        evaluate_target_health  = #{as["EvaluateTargetHealth"]}
      }
      <% end %>
    }

  EOF

    puts template.result(binding)
  end
end

if ARGV.length != 2
  puts "Usage: ./route532tf <zone file> <target zone id>"
  puts ""
  puts "The zone file can be generating by running: aws route53 list-resource-record-sets --hosted-zone-id xxx."
  puts "Target zone id is the zone you which to create new TF records against."
  exit 1
end

convert(filename, zone_id)