Allow to enter a custom text that needs to be confirmed during checkout

src/pretix/base/services/cart.py

@@ -6,6 +6,7 @@ from typing import List, Optional
 from celery.exceptions import MaxRetriesExceededError
 from django.db import transaction
 from django.db.models import Q
+from django.dispatch import receiver
 from django.utils.timezone import now
 from django.utils.translation import pgettext_lazy, ugettext as _
 
@@ -19,8 +20,11 @@ from pretix.base.models.tax import TAXED_ZERO, TaxedPrice, TaxRule
 from pretix.base.services.async import ProfiledTask
 from pretix.base.services.locking import LockTimeoutException
 from pretix.base.services.pricing import get_price
+from pretix.base.templatetags.rich_text import rich_text
 from pretix.celery_app import app
-from pretix.presale.signals import fee_calculation_for_cart
+from pretix.presale.signals import (
+    checkout_confirm_messages, fee_calculation_for_cart,
+)
 
 
 class CartError(LazyLocaleException):
@@ -761,3 +765,13 @@ def set_cart_addons(self, event: int, addons: List[dict], cart_id: str=None, loc
                 self.retry()
         except (MaxRetriesExceededError, LockTimeoutException):
             raise CartError(error_messages['busy'])
+
+
+@receiver(checkout_confirm_messages, dispatch_uid="cart_confirm_messages")
+def confirm_messages(sender, *args, **kwargs):
+    if not sender.settings.confirm_text:
+        return {}
+
+    return {
+        'confirm_text': rich_text(str(sender.settings.confirm_text))
+    }

src/pretix/base/settings.py

@@ -209,6 +209,10 @@ DEFAULTS = {
         'default': None,
         'type': str
     },
+    'confirm_text': {
+        'default': None,
+        'type': str
+    },
     'mail_prefix': {
         'default': None,
         'type': str

src/pretix/control/forms/event.py

@@ -339,6 +339,13 @@ class EventSettingsForm(SettingsForm):
         label=_("Imprint URL"),
         required=False,
     )
+    confirm_text = forms.CharField(
+        label=_('Confirmation text'),
+        help_text=_('This text needs to be confirmed by the user before a purchase is possible. You could for example '
+                    'link your terms of service here. If you use the Pages feature to publish your terms of service, '
+                    'you don\'t need this setting since you can configure it there.'),
+        widget=forms.Textarea(attrs={"rows": 3})
+    )
     contact_mail = forms.EmailField(
         label=_("Contact address"),
         required=False,

src/pretix/control/templates/pretixcontrol/event/settings.html

@@ -45,6 +45,7 @@
             {% bootstrap_field sform.show_times layout="horizontal" %}
             {% bootstrap_field sform.contact_mail layout="horizontal" %}
             {% bootstrap_field sform.imprint_url layout="horizontal" %}
+            {% bootstrap_field sform.confirm_text layout="horizontal" %}
             {% bootstrap_field sform.show_quota_left layout="horizontal" %}
             {% bootstrap_field sform.display_net_prices layout="horizontal" %}
         </fieldset>