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from flask import Flask, request, redirect, url_for, make_response, abort
from mongoengine.fields import get_db
from bson import ObjectId
from gridfs import GridFS
from gridfs.errors import NoFile
from <your_app> import app

@app.route('/files/<oid>')
def serve_gridfs_file(oid):
	try:
		db = get_db()	
		gfs = GridFS(db)
		fl = gfs.get(ObjectId(oid))
		response = make_response(fl.read())
		response.mimetype = fl.content_type
		return response
	except NoFile:
		abort(404)