AWS Route53に登録したゾーン情報をAPIで引っ張ってきてBIND準拠の書式で出力（要awscli）

route53_to_zone.rb

#!/usr/bin/env ruby
# coding: utf-8

require 'json'

opt = {
  :aws => {
    :profile => "<awscliのプロファイル名>",
    :hosted_zone_id => "/hostedzone/<ゾーンID>
  }
}

cmd = "aws --profile %s route53 list-resource-record-sets --hosted-zone-id \"%s\"" % [opt[:aws][:profile],
                                                                                      opt[:aws][:hosted_zone_id]
                                                                                     ]
zones = JSON.parse(%x( #{cmd} ))

zones["ResourceRecordSets"].each{ |record|
  tabs = [(5 - Integer(record["Name"].size / 8)),1].max

  case
  when record.has_key?("ResourceRecords")
    # 通常のエントリ
    record["ResourceRecords"].each{ |v|
      puts "%s%s%7d IN\t%s\t%s" % [record["Name"],
                                 "\t"*tabs,
                                 record["TTL"],
                                 record["Type"],
                                 v["Value"]
                                ]
    }
  when record.has_key?("AliasTarget")
    # エイリアス
    case record["Type"]
    when "A"
      puts "%s%s%7d IN\t%s\t%s\t; %s ALIAS" % [record["Name"],
                                         "\t"*tabs,
                                         "300",
                                         "CNAME",
                                         record["AliasTarget"]["DNSName"].gsub(/^dualstack./,''),
                                         record["Type"]
                                        ]
    else
      puts "; %s IN %s ALIAS %s" % [record["Name"],
                                    record["Type"],
                                    record["AliasTarget"]["DNSName"]
                                   ]
    end
  else
    puts "; unknown recode set: %s" % [record.to_s]
  end
}