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import os
from django.core.files.storage import FileSystemStorage
from django.core.exceptions import ImproperlyConfigured
try:
from PIL import ImageFile as PILImageFile
except ImportError:
raise ImproperlyConfigured("Could not load PIL dependency.\
\nSee http://www.pythonware.com/products/pil/")
class ImageStorage(FileSystemStorage):
"""
A FileSystemStorage which normalizes extensions for images.
Comes from http://www.djangosnippets.org/snippets/965/
"""
def find_extension(self, format):
"""Normalizes PIL-returned format into a standard, lowercase extension."""
format = format.lower()
if format == 'jpeg':
format = 'jpg'
return format
def save(self, name, content):
dirname = os.path.dirname(name)
basename = os.path.basename(name)
# Use PIL to determine filetype
p = PILImageFile.Parser()
while 1:
data = content.read(1024)
if not data:
break
p.feed(data)
if p.image:
im = p.image
break
extension = self.find_extension(im.format)
# Does the basename already have an extension? If so, replace it.
# bare as in without extension
bare_basename, _ = os.path.splitext(basename)
basename = bare_basename + '.' + extension
name = os.path.join(dirname, basename)
return super(ImageStorage, self).save(name, content)
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