add thumbnail generator customizado

assim como a os broswer para rendenderizar a tag <img> desconsideram a
informação de EXIF.orientation, um thumbnail_generator customizado é
necessário para manter a comportamento... para haver reflexo, as imagens
secundárias devem ser apagadas de MEDIA_ROOT, não sendo necessário pois,
reenviar as imagens primárias.

sapl/settings.py

@@ -188,6 +188,9 @@ THUMBNAIL_PROCESSORS = (
     'image_cropping.thumbnail_processors.crop_corners',
 ) + thumbnail_settings.THUMBNAIL_PROCESSORS
 
+THUMBNAIL_SOURCE_GENERATORS = (
+    'sapl.utils.pil_image',
+)
 
 # troque no caso de reimplementação da classe User conforme
 # https://docs.djangoproject.com/en/1.9/topics/auth/customizing/#substituting-a-custom-user-model

sapl/utils.py

@@ -1,13 +1,11 @@
+from functools import wraps
+from operator import itemgetter
+from unicodedata import normalize as unicodedata_normalize
 import hashlib
 import logging
 import os
 import re
-from functools import wraps
-from operator import itemgetter
-from unicodedata import normalize as unicodedata_normalize
 
-import django_filters
-import magic
 from crispy_forms.helper import FormHelper
 from crispy_forms.layout import HTML, Button
 from django import forms
@@ -21,14 +19,23 @@ from django.db.models import Q
 from django.utils import six, timezone
 from django.utils.translation import ugettext_lazy as _
 from django_filters.filterset import STRICTNESS
+from easy_thumbnails import source_generators
 from floppyforms import ClearableFileInput
 from reversion.admin import VersionAdmin
+import django_filters
+import magic
+
 from sapl.crispy_layout_mixin import SaplFormLayout, form_actions, to_row
 from sapl.settings import BASE_DIR
 
+
 sapl_logger = logging.getLogger(BASE_DIR.name)
 
 
+def pil_image(source, exif_orientation=False, **options):
+    return source_generators.pil_image(source, exif_orientation, **options)
+
+
 def normalize(txt):
     return unicodedata_normalize(
         'NFKD', txt).encode('ASCII', 'ignore').decode('ASCII')