How to upload an image from memory

[phoebebright]

I'm trying to add an image that has been extracted from an email straight into django content gallery and tried various approaches with no success. The payload is a bytes object. Would you know how to do this, or how to manually upload a file if I first put the payload into a temporary file?

This::

filename = metadata['filename']
pre, ext = os.path.splitext(filename)

content_type = None
if ext == '.jpg' or ext == '.jpeg':
    content_type = 'jpeg'
elif ext == '.png':
    content_type = 'png'

# load into memory to suit django-content-gallery
image = InMemoryUploadedFile(payload, None, filename,
                                  content_type, sys.getsizeof(payload), None)


image = ImageModel(image=image, content_object=obj)

image.save()

Results in:

File "/Users/pbright/.virtualenvs/iofh1/lib/python3.6/site-packages/content_gallery/utils.py", line 123, in image_resize
  with Image.open(src) as img:
File "/Users/pbright/.virtualenvs/iofh1/lib/python3.6/site-packages/PIL/Image.py", line 2549, in open
  fp = io.BytesIO(fp.read())
File "/Users/pbright/.virtualenvs/iofh1/lib/python3.6/site-packages/django/core/files/utils.py", line 16, in <lambda>
  read = property(lambda self: self.file.read)
File "/Users/pbright/.virtualenvs/iofh1/lib/python3.6/site-packages/django/core/files/utils.py", line 16, in <lambda>
  read = property(lambda self: self.file.read)
 AttributeError: 'bytes' object has no attribute 'read'

This::

with tempfile.NamedTemporaryFile('wb', delete=False, suffix='.jpg') as f:
    f.write(payload)
    f.seek(0)
    image_name = os.path.basename(metadata_dict['filename'])

    img = ImageModel(content_object=obj)

    img.image.save(image_name, File(f), save=True)
    img.save()

gives::

    img.image.save(image_name, File(f), save=True)
   File "/Users/pbright/.virtualenvs/iofh1/lib/python3.6/site-packages/content_gallery/fields.py", line 88, in save
   name = self.image_data.data.name
  AttributeError: 'NoneType' object has no attribute 'name'