docs: def check_whitelist(values):
      """Check the indicators against known whitelists."""
      import os
      import tldextract
      whitelisted = list()
      for name in ['alexa.txt', 'cisco.txt']:
          config_path = os.path.expanduser('~/.config/blockade')
          file_path = os.path.join(config_path, name)
          whitelisted += [x.strip() for x in open(file_path, 'r').readlines()]
      output = list()
      for item in values:
          ext = tldextract.extract(item)
          if ext.registered_domain in whitelisted:
              continue
          output.append(item)
      return output