Retrieve file from GridFS

views.py

from django.http.response import (Http404, HttpResponseNotModified,
    CompatibleStreamingHttpResponse)
from django.utils.http import http_date
from django.views.static import was_modified_since
from gridfs import GridFS
from mongoengine.connection import get_db
from bson.objectid import ObjectId


def file(request, collection_name, grid_id):
    fs = GridFS(get_db(), collection_name)
    oid = ObjectId(grid_id)

    if not fs.exists(oid):
        raise Http404()

    gridout = fs.get(oid)
    mtime = gridout.upload_date.timestamp()
    length = gridout.length
    if gridout.content_type:
        content_type = gridout.content_type
    elif gridout.format:
        content_type = 'image.{}'.format(gridout.format).lower()
    else:
        content_type = 'application/octet-stream'

    # Respect the If-Modified-Since header.
    if not was_modified_since(
            request.META.get('HTTP_IF_MODIFIED_SINCE'), mtime, length):
        return HttpResponseNotModified()

    response = CompatibleStreamingHttpResponse(
        gridout, content_type=content_type)
    response["Last-Modified"] = http_date(mtime)
    response["Content-Length"] = length
    return response