implement hosting domain creation

- implement domains.views.CreateHostingDomain
- define new URL create_hosting_domain in domains.urls
- add domains app URLs to gnuviechadmin.urls
- add templates domains/base.html and domains/hostingdomain_create.html
- link from hostingpackage detail page to domain creation view

gnuviechadmin/domains/urls.py

@@ -0,0 +1,16 @@
+"""
+This module defines the URL patterns for domain related views.
+
+"""
+from __future__ import absolute_import, unicode_literals
+
+from django.conf.urls import patterns, url
+
+from .views import CreateHostingDomain
+
+
+urlpatterns = patterns(
+    '',
+    url(r'^(?P<package>\d+)/create$', CreateHostingDomain.as_view(),
+        name='create_hosting_domain'),
+)

gnuviechadmin/domains/views.py

@@ -0,0 +1,61 @@
+"""
+This module defines views related to domains.
+
+"""
+from __future__ import absolute_import, unicode_literals
+
+from django.shortcuts import redirect, get_object_or_404
+from django.views.generic.edit import CreateView
+from django.utils.translation import ugettext as _
+from django.contrib import messages
+
+from braces.views import (
+    LoginRequiredMixin,
+    StaffuserRequiredMixin,
+)
+
+from hostingpackages.models import CustomerHostingPackage
+
+from .forms import CreateHostingDomainForm
+from .models import HostingDomain
+
+
+class CreateHostingDomain(
+    LoginRequiredMixin, StaffuserRequiredMixin, CreateView
+):
+    """
+    This view is used for creating a new HostingDomain instance for an existing
+    hosting package.
+
+    """
+    model = HostingDomain
+    raise_exception = True
+    template_name_suffix = '_create'
+    form_class = CreateHostingDomainForm
+
+    def _get_hosting_package(self):
+        return get_object_or_404(
+            CustomerHostingPackage, pk=int(self.kwargs['package']))
+
+    def get_form_kwargs(self):
+        kwargs = super(CreateHostingDomain, self).get_form_kwargs()
+        kwargs['hostingpackage'] = self._get_hosting_package()
+        return kwargs
+
+    def get_context_data(self, **kwargs):
+        context = super(CreateHostingDomain, self).get_context_data(**kwargs)
+        hosting_package = self._get_hosting_package()
+        context.update({
+            'hostingpackage': hosting_package,
+            'customer': hosting_package.customer,
+        })
+        return context
+
+    def form_valid(self, form):
+        hostingdomain = form.save()
+        messages.success(
+            self.request,
+            _('Successfully created domain {domainname}').format(
+                domainname=hostingdomain.domain)
+        )
+        return redirect(self._get_hosting_package())