fix import and missing license-header

src/pretix/base/email.py

@@ -42,6 +42,7 @@ from pretix.base.templatetags.rich_text import (
     markdown_compile_email, truelink_callback,
 )
 from pretix.helpers.format import FormattedString, SafeFormatter, format_map
+from pretix.helpers.ssrf import should_block_access
 
 from pretix.base.services.placeholders import (  # noqa
     get_available_placeholders, PlaceholderContext
@@ -51,7 +52,6 @@ from pretix.base.services.placeholders import ( # noqa
     SimpleFunctionalTextPlaceholder as SimpleFunctionalMailTextPlaceholder,
 )
 from pretix.base.settings import get_name_parts_localized # noqa
-from pretix.helpers.ssrf import should_block_access
 
 logger = logging.getLogger('pretix.base.email')
 

src/pretix/helpers/ssrf.py

@@ -1,5 +1,26 @@
-import ipaddress
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020  Raphael Michel and contributors
+# Copyright (C) 2020-today pretix 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/>.
+#
 
+import ipaddress
 
 _cgnat_net = ipaddress.ip_network('100.64.0.0/10')