Initial

backend/common/validators.py

@@ -0,0 +1,23 @@
+from django.core.validators import BaseValidator
+from django.utils.deconstruct import deconstructible
+from django.utils.translation import gettext_lazy as _
+from django.core.files.uploadedfile import TemporaryUploadedFile
+
+
+UNITS = {'k': 1000, 'm': 1000_000, 'g': 1000_000_000}
+
+
+def readableToInt(limit: str) -> int:
+    x = limit.lower().rstrip(' ib')  # KiB & KB -> k
+    multiply = UNITS.get(x[-1], 1)
+    value = float(x.rstrip(' _kmg').replace(',', '.'))
+    return int(value * multiply)
+
+
+@deconstructible
+class MaxFilesizeValidator(BaseValidator):
+    message = _('File size too large (max. %(limit_value)s).')
+    code = 'max_filesize'
+
+    def compare(self, a: TemporaryUploadedFile, limit: str):
+        return a.size > readableToInt(limit)