text: """
  The tool to check the availability or syntax of domains, IPv4, IPv6 or URL.
  
  ::
  
  
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      ██████╔╝ ╚████╔╝ █████╗  ██║   ██║██╔██╗ ██║██║     █████╗  ██████╔╝██║     █████╗
      ██╔═══╝   ╚██╔╝  ██╔══╝  ██║   ██║██║╚██╗██║██║     ██╔══╝  ██╔══██╗██║     ██╔══╝
      ██║        ██║   ██║     ╚██████╔╝██║ ╚████║╚██████╗███████╗██████╔╝███████╗███████╗
      ╚═╝        ╚═╝   ╚═╝      ╚═════╝ ╚═╝  ╚═══╝ ╚═════╝╚══════╝╚═════╝ ╚══════╝╚══════╝
  
  Provides the referer interface.
  
  Author:
      Nissar Chababy, @funilrys, contactTATAfunilrysTODTODcom
  
  Special thanks:
      https://pyfunceble.github.io/special-thanks.html
  
  Contributors:
      https://pyfunceble.github.io/contributors.html
  
  Project link:
      https://github.com/funilrys/PyFunceble
  
  Project documentation:
      https://pyfunceble.readthedocs.io///en/master/
  
  Project homepage:
      https://pyfunceble.github.io/
  
  License:
  ::
  
  
      MIT License
  
      Copyright (c) 2017, 2018, 2019, 2020 Nissar Chababy
  
      Permission is hereby granted, free of charge, to any person obtaining a copy
      of this software and associated documentation files (the "Software"), to deal
      in the Software without restriction, including without limitation the rights
      to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
      copies of the Software, and to permit persons to whom the Software is
      furnished to do so, subject to the following conditions:
  
      The above copyright notice and this permission notice shall be included in all
      copies or substantial portions of the Software.
  
      THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
      AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
      OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
      SOFTWARE.
  """
  
  from random import choice
  
  import PyFunceble
  
  
  class Referer:  # pragma: no cover pylint: disable=too-few-public-methods
      """
      Get the WHOIS server (referer) of the current domain extension according to
      the IANA database.
  
      :param str subject: The subject we are working with.
      """
  
      # We create a list of ignored extension.
      # Note: We need the following because those extension does
      # not have a centralized whois server (yet).
      ignored_extension = [
          "ad",
          "al",
          "an",
          "ao",
          "aq",
          "arpa",
          "az",
          "ba",
          "bb",
          "bd",
          "bf",
          "bh",
          "bl",
          "boots",
          "bq",
          "bs",
          "bt",
          "bv",
          "cg",
          "chloe",
          "ck",
          "cu",
          "cv",
          "cw",
          "cy",
          "dj",
          "doosan",
          "eg",
          "eh",
          "er",
          "et",
          "fk",
          "flsmidth",
          "fm",
          "gb",
          "gm",
          "gn",
          "goodhands",
          "gp",
          "gr",
          "gt",
          "gu",
          "gw",
          "htc",
          "iinet",
          "jm",
          "jo",
          "kh",
          "km",
          "kp",
          "lb",
          "lr",
          "mc",
          "meo",
          "mf",
          "mh",
          "mil",
          "mm",
          "mt",
          "mv",
          "mw",
          "ne",
          "ni",
          "np",
          "nr",
          "pa",
          "pamperedchef",
          "panerai",
          "pg",
          "ph",
          "pk",
          "pn",
          "py",
          "sd",
          "sj",
          "spiegel",
          "sr",
          "ss",
          "sv",
          "sz",
          "telecity",
          "tj",
          "tp",
          "tt",
          "um",
          "va",
          "vi",
          "vista",
          "vn",
          "xn--0zwm56d",
          "xn--11b5bs3a9aj6g",
          "xn--54b7fta0cc",
          "xn--80akhbyknj4f",
          "xn--9t4b11yi5a",
          "xn--deba0ad",
          "xn--g6w251d",
          "xn--hgbk6aj7f53bba",
          "xn--hlcj6aya9esc7a",
          "xn--hlcj6aya9esc7a",
          "xn--jxalpdlp",
          "xn--kgbechtv",
          "xn--l1acc",
          "xn--mgbai9azgqp6j",
          "xn--mgbayh7gpa",
          "xn--mgbc0a9azcg",
          "xn--mgbpl2fh",
          "xn--pgbs0dh",
          "xn--qxam",
          "xn--zckzah",
          "xperia",
          "ye",
          "zw",
      ]
  
      def __init__(self, subject):
          # Note: A URL testing or an IP testing does not come around
          # here. So there is no need to be scared by the following.
  
          if subject:
              if not isinstance(subject, str):
                  raise ValueError("`subject` must be a string.")
  
              self.subject = subject
          else:
              raise ValueError("`subject` must be given.")
  
          try:
              # We get the extension of the currently tested element.
              # We basically get everything after the last point.
              self.domain_extension = subject[subject.rindex(".") + 1 :]
  
              if not self.domain_extension and subject.endswith("."):
                  self.domain_extension = [x for x in subject.split(".") if x][-1]
          except (ValueError, IndexError):
              # There was not point, so no extension to work with.
              self.domain_extension = None
  
          PyFunceble.LOGGER.debug(
              f"Extension to get the referer for: {self.domain_extension}"
          )
  
      def get(self):
          """
          Return the referer aka the WHOIS server of the current domain extension.
  
          :return:
  
              - [0] :code:`None` if there is no referer.
  
              - [0] :code:`False` if the extension is unknown which implicitly means
                 that the subject is :code:`INVALID`
  
              - [0] :code:`str` The resolved IP to use.
  
              - [1] :code:`str`, :code:`None` the domain referer.
  
          :rtype: tuple
          """
  
          if not PyFunceble.CONFIGURATION.local:
              # We are not running a test in a local network.
  
              if self.domain_extension not in self.ignored_extension:
                  # The extension of the domain we are testing is not into
                  # the list of ignored extensions.
  
                  if self.domain_extension in PyFunceble.IANALOOKUP:
                      # The domain extension is in the iana database.
  
                      if not PyFunceble.CONFIGURATION.no_whois:
                          # We are authorized to use WHOIS for the test result.
  
                          # We get the referer from the database.
                          referer = PyFunceble.IANALOOKUP[self.domain_extension]
  
                          if not referer:
                              # The referer is not filled.
  
                              # We log the case of the current extension.
                              PyFunceble.output.Logs().referer_not_found(
                                  self.subject, self.domain_extension
                              )
  
                              # And we handle and return None status.
                              return None, None
  
                          # The referer is into the database.
  
                          PyFunceble.LOGGER.debug(f"Referer: {referer}")
  
                          resolved_referer = PyFunceble.DNSLOOKUP.a_record(referer)
  
                          PyFunceble.LOGGER.debug(f"Resolved Referer: {resolved_referer}")
  
                          try:
                              # We return the extracted referer.
                              return choice(resolved_referer), referer
                          except (IndexError, TypeError):
                              return None, referer
  
                      # We are not authorized to use WHOIS for the test result.
  
                  # The domain extension is not in the iana database.
  
              # The extension of the domain we are testing is not into
              # the list of ignored extensions.
  
          # We are running a test in a local network.
  
          # We return None.
          return None, None
  