implement mail address target editing

- extract common code into managemails.forms.MailAddressFieldMixin
- move code from forms into managemails.models.MailAddress
- implement managemails.models.MailboxManager.unused and unused_or_own
- implement managemails.forms.EditMailAddressForm
- add managemails.views.EditMailAddress
- add URL pattern 'edit_mailaddress' to managemails.urls
- add template managemails/mailaddress_edit.html
- add changelog entry

gnuviechadmin/managemails/views.py

@@ -23,9 +23,12 @@ from .forms import (
     AddMailAddressForm,
     ChangeMailboxPasswordForm,
     CreateMailboxForm,
+    EditMailAddressForm,
+    MAILBOX_OR_FORWARDS,
 )
 from .models import (
     MailAddress,
+    MailAddressMailbox,
     Mailbox,
 )
 
@@ -188,3 +191,55 @@ class DeleteMailAddress(
 
     def get_success_url(self):
         return self.get_hosting_package().get_absolute_url()
+
+
+class EditMailAddress(
+    HostingPackageAndCustomerMixin, StaffOrSelfLoginRequiredMixin, UpdateView
+):
+    """
+    This view is used to edit a mail address' target mailbox or forwarding
+    addresses.
+
+    """
+    context_object_name = 'mailaddress'
+    form_class = EditMailAddressForm
+    model = MailAddress
+    template_name_suffix = '_edit'
+
+    def get_maildomain(self):
+        return get_object_or_404(MailDomain, domain=self.kwargs['domain'])
+
+    def get_context_data(self, **kwargs):
+        context = super(EditMailAddress, self).get_context_data(**kwargs)
+        context['customer'] = self.get_customer_object()
+        return context
+
+    def get_form_kwargs(self):
+        kwargs = super(EditMailAddress, self).get_form_kwargs()
+        kwargs.update({
+            'hostingpackage': self.get_hosting_package(),
+            'maildomain': self.get_maildomain(),
+        })
+        return kwargs
+
+    def get_initial(self):
+        initial = super(EditMailAddress, self).get_initial()
+        mailaddress = self.get_object()
+        if MailAddressMailbox.objects.filter(mailaddress=mailaddress).exists():
+            initial['mailbox'] = mailaddress.mailaddressmailbox.mailbox
+            initial['mailbox_or_forwards'] = MAILBOX_OR_FORWARDS.mailbox
+        elif mailaddress.mailaddressforward_set.exists():
+            initial['forwards'] = ", ".join(
+                fwd.target for fwd in mailaddress.mailaddressforward_set.all()
+            )
+            initial['mailbox_or_forwards'] = MAILBOX_OR_FORWARDS.forwards
+        return initial
+
+    def form_valid(self, form):
+        mailaddress = form.save()
+        messages.success(
+            self.request,
+            _('Successfully updated mail address {mailaddress} '
+              'targets.').format(mailaddress=mailaddress)
+        )
+        return redirect(self.get_hosting_package())