Validate image size in pixels at upload time (#3003)

src/tests/const.py

@@ -0,0 +1,26 @@
+#
+# 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/>.
+#
+
+# This is a very short, but valid PNG
+SAMPLE_PNG = b'\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x01\x00\x00\x00\x01\x00\x01\x03\x00\x00\x00f\xbc:%\x00\x00' \
+             b'\x00\x03PLTE\xb5\xd0\xd0c\x04\x16\xea\x00\x00\x00\x1fIDATh\x81\xed\xc1\x01\r\x00\x00\x00\xc2\xa0\xf7Om' \
+             b'\x0e7\xa0\x00\x00\x00\x00\x00\x00\x00\x00\xbe\r!\x00\x00\x01\x9a`\xe1\xd5\x00\x00\x00\x00IEND\xaeB`\x82'