@login_required
def download_file(request):
    filename = request.GET.get('filename', '')
    env_path = os.path.abspath(os.path.dirname(__file__))
    path = '/'.join([env_path, '..', '{0}'.format(filename)])
    try:
        f = open(path, 'rb')
    except IOError:
        return HttpResponse('download failed')
    else:
        with f:
            wrapper = FileWrapper(f)
            response = HttpResponse(wrapper, content_type='application')
            response['Content-Disposition'] = 'attachment; filename='+filename
            return response