Added signals to VoucherBulkForm to ease extension

src/pretix/control/forms/vouchers.py

@@ -1,3 +1,5 @@
+import copy
+
 from django import forms
 from django.core.exceptions import ValidationError
 from django.utils.translation import ugettext_lazy as _
@@ -107,3 +109,17 @@ class VoucherBulkForm(VoucherForm):
             raise ValidationError(_('A voucher with one of this codes already exists.'))
 
         return data
+
+    def save(self, event, *args, **kwargs):
+        objs = []
+        for code in self.cleaned_data['codes']:
+            obj = copy.copy(self.instance)
+            obj.event = event
+            obj.code = code
+            data = dict(self.cleaned_data)
+            data['code'] = code
+            data['bulk'] = True
+            del data['codes']
+            obj.save()
+            objs.append(obj)
+        return objs

src/pretix/control/templates/pretixcontrol/vouchers/bulk.html

@@ -1,5 +1,6 @@
 {% extends "pretixcontrol/items/base.html" %}
 {% load i18n %}
+{% load eventsignal %}
 {% load bootstrap3 %}
 {% block title %}{% trans "Voucher" %}{% endblock %}
 {% block inside %}
@@ -48,6 +49,7 @@
             {% bootstrap_field form.tag layout="horizontal" %}
             {% bootstrap_field form.comment layout="horizontal" %}
         </fieldset>
+        {% eventsignal request.event "pretix.control.signals.voucher_form_html" form=form %}
         <div class="form-group submit-group">
             <button type="submit" class="btn btn-primary btn-save">
                 {% trans "Save" %}

src/pretix/control/views/vouchers.py

@@ -144,7 +144,6 @@ class VoucherCreate(EventPermissionRequiredMixin, CreateView):
 
 class VoucherBulkCreate(EventPermissionRequiredMixin, CreateView):
     model = Voucher
-    form_class = VoucherBulkForm
     template_name = 'pretixcontrol/vouchers/bulk.html'
     permission = 'can_change_vouchers'
     context_object_name = 'voucher'
@@ -162,16 +161,14 @@ class VoucherBulkCreate(EventPermissionRequiredMixin, CreateView):
 
     @transaction.atomic()
     def form_valid(self, form):
-        for code in form.cleaned_data['codes']:
-            obj = copy.copy(form.instance)
-            obj.event = self.request.event
-            obj.code = code
-            data = dict(form.cleaned_data)
-            data['code'] = code
-            data['bulk'] = True
-            del data['codes']
-            obj.save()
-            obj.log_action('pretix.voucher.added', data=data, user=self.request.user)
-
+        for o in form.save(self.request.event):
+            o.log_action('pretix.voucher.added', data=form.cleaned_data, user=self.request.user)
         messages.success(self.request, _('The new vouchers have been created.'))
         return HttpResponseRedirect(self.get_success_url())
+
+    def get_form_class(self):
+        form_class = VoucherBulkForm
+        for receiver, response in voucher_form_class.send(self.request.event, cls=form_class):
+            if response:
+                form_class = response
+        return form_class