Wrap ContentFile in a file-like object with a filename and content_type.

This extra layer of indirection allows us to tack some attributes
(name and content_type) onto the underlying file, which we cannot
do with a StringIO since it's a native ctype.

These attributes are used by various third-party software that expects
to work with django.core.files.File instances, and not directly with
StringIO instances. By way of example, the django-storages mosso
backend (CloudFilesStorage) looks for a content_type attribute, and
the cloudfiles Object backend looks for a name attribute.

AUTHORS

@@ -23,6 +23,7 @@ Contributors
 * `Timothée Peignier`_
 * `Madis Väin`_
 * `Jan Sagemüller`_
+* `Clay McClure`_
 
 .. _Justin Driscoll: http://github.com/jdriscoll
 .. _HZDG: http://hzdg.com
@@ -40,3 +41,4 @@ Contributors
 .. _Timothée Peignier: http://github.com/cyberdelia
 .. _Madis Väin: http://github.com/madisvain
 .. _Jan Sagemüller: https://github.com/version2
+.. _Clay McClure: https://github.com/claymation

imagekit/generators.py

@@ -1,4 +1,6 @@
+import mimetypes
 import os
+
 from StringIO import StringIO
 
 from django.core.files.base import ContentFile
@@ -9,6 +11,23 @@ from .utils import img_to_fobj, open_image, \
         UnknownExtensionError
 
 
+class SpecFile(ContentFile):
+    """
+    Wraps a ContentFile in a file-like object with a filename
+    and a content_type.
+    """
+    def __init__(self, filename, content):
+        self.file = ContentFile(content)
+        self.file.name = filename
+        try:
+            self.file.content_type = mimetypes.guess_type(filename)[0]
+        except IndexError:
+            self.file.content_type = None
+
+    def __str__(self):
+        return self.file.name
+
+
 class SpecFileGenerator(object):
     def __init__(self, processors=None, format=None, options={},
             autoconvert=True, storage=None):
@@ -50,7 +69,7 @@ class SpecFileGenerator(object):
                     options.items())
 
         imgfile = img_to_fobj(img, format, **options)
-        content = ContentFile(imgfile.read())
+        content = SpecFile(filename, imgfile.read())
         return img, content
 
     def suggest_extension(self, name):