Consistently set default background PDFs on server, not client (#2840)

Co-authored-by: Martin Gross <gross@rami.io>

src/pretix/multidomain/utils.py

@@ -0,0 +1,47 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+from urllib.parse import urljoin, urlsplit
+
+from django.conf import settings
+from django.templatetags.static import static
+
+from pretix.base.models import Event
+from pretix.multidomain.urlreverse import (
+    get_event_domain, get_organizer_domain,
+)
+
+
+def static_absolute(object, path):
+    sp = static(path)
+    if sp.startswith("/"):
+        if isinstance(object, Event):
+            domain = get_event_domain(object, fallback=True)
+        else:
+            domain = get_organizer_domain(object)
+        if domain:
+            siteurlsplit = urlsplit(settings.SITE_URL)
+            if siteurlsplit.port and siteurlsplit.port not in (80, 443):
+                domain = '%s:%d' % (domain, siteurlsplit.port)
+            sp = urljoin('%s://%s' % (siteurlsplit.scheme, domain), sp)
+        else:
+            sp = urljoin(settings.SITE_URL, sp)
+    return sp

src/pretix/plugins/badges/api.py

@@ -24,6 +24,7 @@ from rest_framework import viewsets
 from pretix.api.serializers.i18n import I18nAwareModelSerializer
 from pretix.api.serializers.order import CompatibleJSONField
 
+from ...multidomain.utils import static_absolute
 from .models import BadgeItem, BadgeLayout
 
 
@@ -47,6 +48,12 @@ class BadgeLayoutSerializer(I18nAwareModelSerializer):
         model = BadgeLayout
         fields = ('id', 'name', 'default', 'layout', 'background', 'item_assignments')
 
+    def to_representation(self, instance):
+        d = super().to_representation(instance)
+        if not d['background']:
+            d['background'] = static_absolute(instance.event, "pretixplugins/badges/badge_default_a6l.pdf")
+        return d
+
 
 class BadgeLayoutViewSet(viewsets.ReadOnlyModelViewSet):
     serializer_class = BadgeLayoutSerializer

src/pretix/plugins/ticketoutputpdf/api.py

@@ -24,6 +24,7 @@ from rest_framework import viewsets
 from pretix.api.serializers.i18n import I18nAwareModelSerializer
 from pretix.api.serializers.order import CompatibleJSONField
 
+from ...multidomain.utils import static_absolute
 from .models import TicketLayout, TicketLayoutItem
 
 
@@ -49,6 +50,12 @@ class TicketLayoutSerializer(I18nAwareModelSerializer):
         model = TicketLayout
         fields = ('id', 'name', 'default', 'layout', 'background', 'item_assignments')
 
+    def to_representation(self, instance):
+        d = super().to_representation(instance)
+        if not d['background']:
+            d['background'] = static_absolute(instance.event, "pretixpresale/pdf/ticket_default_a4.pdf")
+        return d
+
 
 class TicketLayoutViewSet(viewsets.ReadOnlyModelViewSet):
     serializer_class = TicketLayoutSerializer

src/pretix/plugins/ticketoutputpdf/apps.py

@@ -34,7 +34,7 @@
 
 from django.apps import AppConfig
 from django.utils.functional import cached_property
-from django.utils.translation import gettext_lazy as _
+from django.utils.translation import gettext, gettext_lazy as _
 
 from pretix import __version__ as version
 
@@ -63,3 +63,11 @@ class TicketOutputPdfApp(AppConfig):
         except ImportError:
             errs.append("Python package 'reportlab' is not installed.")
         return errs
+
+    def installed(self, event):
+        event.ticket_layouts.get_or_create(
+            default=True,
+            defaults={
+                'name': gettext('Default layout'),
+            }
+        )

src/tests/plugins/badges/test_api.py

@@ -52,7 +52,7 @@ RES_LAYOUT = {
     'default': True,
     'item_assignments': [{'item': 1}],
     'layout': [{'a': 2}],
-    'background': None
+    'background': 'http://example.com/static/pretixplugins/badges/badge_default_a6l.pdf'
 }
 
 

src/tests/plugins/ticketoutputpdf/test_api.py

@@ -52,7 +52,7 @@ RES_LAYOUT = {
     'default': True,
     'item_assignments': [{'item': 1, 'sales_channel': 'web'}],
     'layout': [{'a': 2}],
-    'background': None
+    'background': 'http://example.com/static/pretixpresale/pdf/ticket_default_a4.pdf'
 }