old_contents: """letsencrypt's certbot Authentication Logic."""
  
  from lets_do_dns.acme_dns_auth.record import Record
  from lets_do_dns.acme_dns_auth.command import run
  from lets_do_dns.acme_dns_auth.time_delay import sleep
  
  
  class Authenticate(object):
      """Handle letsencrypt DNS certificate identity authentication."""
  
      def __init__(self, environment):
          self._env = environment
          self._record = self._init_record()
  
      def perform(self):
          """Execute the authentication logic."""
          if self._in_post_hook_phase:
              self._delete_record()
              self._run_post_cmd()
          else:
              self._create_record()
              self._print_record_id()
              self._delay_finish()
  
          return 0
  
      @property
      def _in_post_hook_phase(self):
          return self._env.record_id is not None
  
      def _delete_record(self):
          self._record.id = self._env.record_id
          self._record.delete()
  
      def _run_post_cmd(self):
          if self._env.post_cmd:
              run(self._env.post_cmd)
  
      def _create_record(self):
          self._record.create(self._env.validation_key)
  
      def _print_record_id(self):
          self._record.printer()
  
      def _init_record(self):
          hostname = self._parse_hostname()
          record = Record(self._env.api_key, self._env.domain, hostname)
          return record
  
      def _parse_hostname(self):
          domain_suffix = '.' + self._env.domain
          domain_start = self._env.fqdn.rfind(domain_suffix)
  
          cert_hostname = self._env.fqdn[0:domain_start]
          auth_hostname = '_acme-challenge.%s' % cert_hostname
  
          return auth_hostname
  
      @staticmethod
      def _delay_finish():
          sleep(2)
  
new_contents: """letsencrypt's certbot Authentication Logic."""
  
  from lets_do_dns.acme_dns_auth.record import Record
  from lets_do_dns.acme_dns_auth.command import run
  from lets_do_dns.acme_dns_auth.time_delay import sleep
  
  
  class Authenticate(object):
      """Handle letsencrypt DNS certificate identity authentication."""
  
      def __init__(self, environment):
          self._env = environment
          self._record = self._init_record()
  
      def perform(self):
          """Execute the authentication logic."""
          if self._in_authentication_hook_stage:
              self._create_record()
              self._print_record_id()
              self._delay_finish()
  
          elif self._in_cleanup_hook_stage:
              self._delete_record()
              self._run_post_cmd()
  
          return 0
  
      @property
      def _in_authentication_hook_stage(self):
          return self._env.record_id is None
  
      @property
      def _in_cleanup_hook_stage(self):
          return self._env.record_id is not None
  
      def _delete_record(self):
          self._record.id = self._env.record_id
          self._record.delete()
  
      def _run_post_cmd(self):
          if self._env.post_cmd:
              run(self._env.post_cmd)
  
      def _create_record(self):
          self._record.create(self._env.validation_key)
  
      def _print_record_id(self):
          self._record.printer()
  
      def _init_record(self):
          hostname = self._parse_hostname()
          record = Record(self._env.api_key, self._env.domain, hostname)
          return record
  
      def _parse_hostname(self):
          domain_suffix = '.' + self._env.domain
          domain_start = self._env.fqdn.rfind(domain_suffix)
  
          cert_hostname = self._env.fqdn[0:domain_start]
          auth_hostname = '_acme-challenge.%s' % cert_hostname
  
          return auth_hostname
  
      @staticmethod
      def _delay_finish():
          sleep(2)
  
subject: Refactor for improved clarity