functions.py

import logging
import random, string
import cloudstorage as gcs
from google.appengine.ext import blobstore
from google.appengine.api import images
from settings import BUCKET_NAME

def random_string(n=8):
    return ''.join(random.choice(string.ascii_letters + string.digits) for _ in range(n))

def upload(f):
    if not f:
        return None
    filename = '/{}/{}/{}'.format(BUCKET_NAME, random_string(), f.filename)
    gcs_options = {'x-goog-acl': 'public-read'}
    gcs_file = gcs.open(filename, 'w', options=gcs_options)
    gcs_file.write(f.read())
    gcs_file.close()
    url = 'https://storage.googleapis.com' + filename
    try:
        blob_key = blobstore.create_gs_key("/gs" + filename)
        url = images.get_serving_url(blob_key)
    except Exception as e:
        logging.debug('File is not an image')
        logging.exception(e)
    return url