update-route-53-alisa-for-sqale.rb

#!/usr/bin/env ruby

require 'resolv'
require 'route53'

SQALE_DOMAIN    = 'i4pc-mizzy.sqale.jp.'
ORIGINAL_DOMAIN = 'i4pc.net.'

# This code is from
# https://github.com/bgentry/fog/commit/26d366d3047f437154946b2bb15935c2ee34a209
def hosted_zone_for_alias_target(dns_name)
  k = elb_hosted_zone_mapping.keys.find do |k|
    dns_name =~ /\A.+\.#{k}\.elb\.amazonaws\.com\.?\z/
  end
  elb_hosted_zone_mapping[k]
end

def elb_hosted_zone_mapping
  @elb_hosted_zone_mapping ||= {
    "ap-northeast-1" => "Z2YN17T5R711GT",
    "ap-southeast-1" => "Z1WI8VXHPB1R38",
    "eu-west-1"      => "Z3NF1Z3NOM5OY2",
    "sa-east-1"      => "Z2ES78Y61JGQKS",
    "us-east-1"      => "Z3DZXE0Q79N41H",
    "us-west-1"      => "Z1M58G0W56PQJA",
    "us-west-2"      => "Z33MTJ483KN6FU",
  }
end

elb = Resolv::DNS.new.getresources(
  SQALE_DOMAIN,
  Resolv::DNS::Resource::IN::CNAME
)[0].name.to_s

hosted_zone_id = hosted_zone_for_alias_target(elb)

conn = Route53::Connection.new(ENV['AWS_ACCESS_KEY'], ENV['AWS_SECRET_KEY'])

conn.get_zones.each do |zone|
  next if zone.name != ORIGINAL_DOMAIN
  found = false
  zone.get_records.each do |record|
    if record.name == ORIGINAL_DOMAIN and record.type == 'A'
      found = true
      record.update(nil, nil, nil, [ elb ], hosted_zone_id)
    end
  end

  unless found
    record = Route53::DNSRecord.new(
      ORIGINAL_DOMAIN,
      'A',
      nil,
      [ elb ],
      zone,
      hosted_zone_id
    )
    record.create
  end
end