docs: def CookieAuthSourceInitializer(
      secret,
      cookie_name='auth',
      secure=False,
      max_age=None,
      httponly=False,
      path="/",
      domains=None,
      debug=False,
      hashalg='sha512',
  ):
      """ An authentication source that uses a unique cookie. """
  
      @implementer(IAuthSourceService)
      class CookieAuthSource(object):
          vary = ['Cookie']
  
          def __init__(self, context, request):
              self.domains = domains
  
              if self.domains is None:
                  self.domains = []
                  self.domains.append(request.domain)
  
              self.cookie = SignedCookieProfile(
                  secret,
                  'authsanity',
                  cookie_name,
                  secure=secure,
                  max_age=max_age,
                  httponly=httponly,
                  path=path,
                  domains=domains,
                  hashalg=hashalg,
                  )
              # Bind the cookie to the current request
              self.cookie = self.cookie.bind(request)
  
          def get_value(self):
              val = self.cookie.get_value()
  
              if val is None:
                  return [None, None]
  
              return val
  
          def headers_remember(self, value):
              return self.cookie.get_headers(value, domains=self.domains)
  
          def headers_forget(self):
              return self.cookie.get_headers(None, max_age=0)
  
      return CookieAuthSource