old_contents: import logging
  
  logger = logging.getLogger(__name__)
  
  try:
      from django_slack import slack_message
  except:
      logger.error("Cannot resolve 'django_slack.log.SlackExceptionHandler':"
                   " No module named django_slack")
  
  from django.conf import settings
  from django.middleware.common import BrokenLinkEmailsMiddleware
  
  from django.utils.encoding import force_text
  
  
  class BrokenLinkSlackMiddleware(BrokenLinkEmailsMiddleware):
  
      def process_response(self, request, response):
          """
          Send broken link emails for relevant 404 NOT FOUND responses.
          """
          if response.status_code == 404 and not settings.DEBUG:
              domain = request.get_host()
              path = request.get_full_path()
              referer = force_text(request.META.get('HTTP_REFERER', ''),
                                   errors='replace')
  
              if not self.is_ignorable_request(request, path, domain, referer):
                  ua = request.META.get('HTTP_USER_AGENT', '<none>')
                  ip = request.META.get('REMOTE_ADDR', '<none>')
  
                  subject = "Broken %slink on %s" % (
                      ('INTERNAL ' if self.is_internal_request(
                          domain, referer) else ''),
                      domain
                  )
                  message = ("Referrer: %s\nRequested URL: %s\nUser agent: %s\n"
                             "IP address: %s\n" % (referer, path, ua, ip))
                  attachments = {
                      'subject': subject,
                      'text': message,
                      'color': 'warning',
                  }
                  template = 'django_slack/exception.slack'
  
                  slack_message(template, {'text': subject}, [attachments])
          return response
  
new_contents: import logging
  
  from django.conf import settings
  from django.middleware.common import BrokenLinkEmailsMiddleware
  
  from django.utils.encoding import force_text
  
  logger = logging.getLogger(__name__)
  
  try:
      from django_slack import slack_message
  except ImportError:
      logger.error("Cannot resolve 'django_slack.log.SlackExceptionHandler':"
                   " No module named django_slack")
  
  
  class BrokenLinkSlackMiddleware(BrokenLinkEmailsMiddleware):
  
      def process_response(self, request, response):
          """
          Send broken link emails for relevant 404 NOT FOUND responses.
          """
          if response.status_code == 404 and not settings.DEBUG:
              domain = request.get_host()
              path = request.get_full_path()
              referer = force_text(request.META.get('HTTP_REFERER', ''),
                                   errors='replace')
  
              if not self.is_ignorable_request(request, path, domain, referer):
                  ua = request.META.get('HTTP_USER_AGENT', '<none>')
                  ip = request.META.get('REMOTE_ADDR', '<none>')
  
                  subject = "Broken %slink on %s" % (
                      ('INTERNAL ' if self.is_internal_request(
                          domain, referer) else ''),
                      domain
                  )
                  message = ("Referrer: %s\nRequested URL: %s\nUser agent: %s\n"
                             "IP address: %s\n" % (referer, path, ua, ip))
                  attachments = {
                      'subject': subject,
                      'text': message,
                      'color': 'warning',
                  }
                  template = 'django_slack/exception.slack'
  
                  slack_message(template, {'text': subject}, [attachments])
          return response
  
subject: fix flake8