ungleich-no-ipv4-here/no_ipv4_here/views.py

from urllib.parse import urlsplit

from django.views.generic import TemplateView

import re

# Create your views here.

class IndexView(TemplateView):
    template_name = 'no_ipv4_here/index.html'

    def get_context_data(self, **kwargs):
        context = super(IndexView, self).get_context_data(**kwargs)
        back_to_url = ""

        if "back_to" in self.request.GET:
            back_to_url = self.request.GET["back_to"]
        elif 'HTTP_HOST' in self.request.META:
            # Exclude ourselves
            if not re.match("^(no-ipv4-here.ungleich.ch|localhost)", self.request.META['HTTP_HOST']):
                back_to_url = "http://{}".format(self.request.META['HTTP_HOST'])


        context['back_to_url'] = back_to_url
        if back_to_url != "":
            context['domain'] = (urlsplit(back_to_url)).netloc

        return context