Update dep.

[wolnelektury.git] / src / api / fields.py

diff --git a/src/api/fields.py b/src/api/fields.py
index 1ce83cc..66fd7d2 100644 (file)
--- a/src/api/fields.py
+++ b/src/api/fields.py
@@ -1,4 +1,9 @@
+# -*- coding: utf-8 -*-
+# This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
+# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
+#
 from rest_framework import serializers
+from sorl.thumbnail import default
 from django.core.urlresolvers import reverse
 from paypal.rest import user_is_subscribed
 
@@ -41,3 +46,15 @@ class UserPremiumField(serializers.ReadOnlyField):
 
     def to_representation(self, value):
         return user_is_subscribed(value)
+
+
+class ThumbnailField(serializers.FileField):
+    def __init__(self, geometry, *args, **kwargs):
+        self.geometry = geometry
+        super(ThumbnailField, self).__init__(*args, **kwargs)
+
+    def to_representation(self, value):
+        if value:
+            return super(ThumbnailField, self).to_representation(
+                default.backend.get_thumbnail(value, self.geometry)
+            )