Google App Engine Boilerplate “access was denied t

Question

I have a website and I want to allow admins to upload pictures through an upload form.

HTML: On a page blob.html:

<form name="uploader" action="/blob/" method="post" enctype="multipart/form-data">
    <input type="file"><br>
    <input type="submit" value="Upload">
</form>

blob.py:

import os

import webapp2
import jinja2    

# blobstore api
from google.appengine.ext import blobstore
from google.appengine.ext.webapp import blobstore_handlers

template_env = jinja2.Environment(loader=jinja2.FileSystemLoader(os.getcwd()))

class MainPage(webapp2.RequestHandler): 

    def get(self):

        upload_url = blobstore.create_upload_url('/blob/')
        template = template_env.get_template('blob.html') 
        context = {
             'upload_url': upload_url
        }
        self.response.write(template.render(context))

    def post(self):

        upload_files = self.get_uploads('uploader')
        blob_info = upload_files[0]
        # So some logging here and concept to store the reference of the blob key.
        #self.redirect('/')

app.yaml:

...stuff...
handlers:
- url: /blob/
  script: blob.app
  login: admin

...stuff...

But when I go to the /blob/ on my website, I get this error:

Traceback (most recent call last):
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 239, in Handle
    handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 301, in _LoadHandler
    raise err
ImportError: <module 'blob' from '/base/data/home/apps/s~themoringathebetter/1.372284039078482061/blob.pyc'> has no attribute app

Answer 1

Full rewrite

So practically you want someone to code a small boilerplate for you, here you are. Use /uploadform/ for the form and / for the index. I kept is as simple as I could.

BoilerPlate Form for image uploads

Make sure you have PIL installed. (Tip: For osx use easy_install pil)