Python String to Django File Object

django_file_response.py

"""
Using Amazon S3 with filename to get data in string and convert to file object
then returning HTTP response from file object with mime type.
"""

import os
import mimetypes
from django.http import Http404, HttpResponse
from django.core.files.base import ContentFile
from django.core.files.storage import default_storage


filename = 'blah/blah/blah/photo.jpg

base_name = os.path.basename(filename)
mime_type = mimetypes.guess_type(base_name)[0]

if not mime_type:
    raise Http404

if not default_storage.exists(filename):
    raise Http404

data =default_storage.open(filename).read()
f = ContentFile(data)

response = HttpResponse(f.read(), mimetype=mime_type)
response['Content-Disposition'] = 'filename=%s' % base_name
return response