django-dbfilestorage/dbfilestorage/views.py

from django.http import HttpResponse, Http404
from django.db.models import Q
from django.shortcuts import get_object_or_404

from .models import DBFile


def show_file(request, name):
    """
        Get the file object referenced by :name:
        Render the decoded base64 representation of the file,
            applying the content_type (or closest representation)

        :return HttpResponse: Rendered file
    """
    dbf = DBFile.objects.filter(Q(name=name)|Q(filehash=name))
    if dbf.exists():
        response = HttpResponse(
            dbf[0].b64.decode('base64'),
            content_type=dbf[0].content_type)
        response['Content-Disposition'] = 'attachment; filename="{}"'.format(
            dbf[0].name)
        return response
    raise Http404