Add option to add robots=noindex meta tag

src/pretix/control/forms/event.py

@@ -919,6 +919,9 @@ class DisplaySettingsForm(SettingsForm):
             ('name_descending', _('Name (descending)')),
         ],  # When adding a new ordering, remember to also define it in the event model
     )
+    meta_noindex = forms.BooleanField(
+        label=_('Ask search engines not to index the ticket shop')
+    )
 
     def __init__(self, *args, **kwargs):
         event = kwargs['obj']

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

@@ -11,6 +11,7 @@
             {% bootstrap_field form.logo_image layout="control" %}
             {% bootstrap_field form.frontpage_text layout="control" %}
             {% bootstrap_field form.show_variations_expanded layout="control" %}
+            {% bootstrap_field form.meta_noindex layout="control" %}
             {% if form.frontpage_subevent_ordering %}
                 {% bootstrap_field form.frontpage_subevent_ordering layout="control" %}
             {% endif %}

src/pretix/presale/templates/pretixpresale/event/base.html

@@ -7,6 +7,11 @@
 {% block thetitle %}
     {% block title %}{% endblock %}{% if url_name != "event.index" %} :: {% endif %}{{ event.name }}
 {% endblock %}
+{% block custom_header %}
+    {% if event.settings.meta_noindex %}
+        <meta name="robots" content="noindex, nofollow">
+    {% endif %}
+{% endblock %}
 {% block above %}
     <script type="text/javascript" src="{% static "pretixpresale/js/ui/iframe.js" %}"></script>
     {% if not event.live %}