Fixed crash when auditing on binary data

easyaudit/tests/test_app/tests.py

@@ -4,6 +4,9 @@
 from unittest import skip, skipIf
 
 import django
+from django.db.models import BinaryField
+
+from easyaudit.utils import get_field_value
 
 asgi_views_supported = django.VERSION >= (3, 1)
 if asgi_views_supported:
@@ -246,3 +249,25 @@ def test_request_event_admin_no_users(self):
         response = self.client.get(reverse('admin:easyaudit_requestevent_changelist'))
         self.assertEqual(200, response.status_code)
         filters = self._list_filters(response.content)
+
+
+@override_settings(TEST=True)
+class TestBinaryData(TestCase):
+    def test_binary_data(self):
+        class FakeObject:
+            pass
+        obj = FakeObject()
+        obj.binary_data = b'\x00\x00\x00 cHRM\x00\x00z&\x00\x00\x80\x84\x00\x00\xfa\x00\x00'
+        binary_field = BinaryField()
+        binary_field.name = 'binary_data'
+
+        # Small
+        actual = get_field_value(obj, binary_field)
+        expected = r"b'\x00\x00\x00 cHRM\x00\x00z&\x00\x00\x80\x84\x00\x00\xfa\x00\x00'"
+        assert actual == expected
+
+        # Large
+        obj.binary_data = b'\x00\x00\x00 cHRM\x00\x00z&\x00\x00\x80\x84\x00\x00\xfa\x00\x00' * 100
+        actual = get_field_value(obj, binary_field)
+        assert actual.startswith(expected[:-1])
+        assert actual.endswith('[truncated 2000 bytes]')

easyaudit/utils.py

@@ -1,7 +1,5 @@
 from __future__ import unicode_literals
 
-from uuid import UUID
-
 from django.conf import settings
 from django.core.exceptions import ObjectDoesNotExist
 from django.db.models import NOT_PROVIDED, DateTimeField
@@ -19,15 +17,21 @@ def get_field_value(obj, field):
     :return: The value of the field as a string.
     :rtype: str
     """
+    raw_value = getattr(obj, field.name, None)
     if isinstance(field, DateTimeField):
         # DateTimeFields are timezone-aware, so we need to convert the field
         # to its naive form before we can accurately compare them for changes.
         try:
-            value = field.to_python(getattr(obj, field.name, None))
+            value = field.to_python(raw_value)
             if value is not None and settings.USE_TZ and not timezone.is_naive(value):
                 value = timezone.make_naive(value, timezone=timezone.utc)
         except ObjectDoesNotExist:
             value = field.default if field.default is not NOT_PROVIDED else None
+    elif isinstance(raw_value, bytes):
+        if len(raw_value) > 100:
+            return repr(raw_value[:100]) + '[truncated {} bytes]'.format(len(raw_value) - 100)
+        else:
+            return repr(raw_value)
     else:
         try:
             value = smart_str(getattr(obj, field.name, None))