Encoding problem in app engine when submitting multipart/form-data forms

Question

I have a simple form that submits a image to the blobstore and a title for the image. This works on my local devserver but when I deploy my code, non ascii letters in the ti

Answer 1

This comment explains how to fix the issue and includes the appengine_config.py, which makes everything work: http://code.google.com/p/googleappengine/issues/detail?id=2749#c21

I don't include the code here because I have no idea how to attach file, and it's quite big to be included inline.

Answer 2

=CD is the quoted-printable representation of Í.

I have no explanation as to why the production server would be giving you this data as quoted-printable when the dev_appserver doesn't, but the quopri module from the standard library can decode it for you.

Answer 3

Add the newer webob library to your app.yaml :

libraries:
- name: webapp2
  version: "2.5.2"
- name: webob
  version: "1.2.3"

Got it from: https://code.google.com/p/googleappengine/issues/detail?id=2749

Answer 4

I'm using Django nonrel and fixed it with this middleware:

http://code.google.com/p/googleappengine/issues/detail?id=2749#c33

import logging
import quopri
log = logging.getLogger(__name__)

class BlobRedirectFixMiddleware(object):
    def process_request(self, request):
        if request.method == 'POST' and 'HTTP_X_APPENGINE_BLOBUPLOAD' in request.META and request.META['HTTP_X_APPENGINE_BLOBUPLOAD'] == 'true':
            request.POST = request.POST.copy()
            log.info('POST before decoding: %s' % request.POST)
            for key in request.POST:
                if key.startswith('_') or key == u'csrfmiddlewaretoken':
                    continue
                value = request.POST[key]
                if isinstance(value,(str, unicode)):
                    request.POST[key] = unicode(quopri.decodestring(value), 'iso_8859-2')
            log.info('POST after decoding: %s' % request.POST) 
        return None

Answer 5

have you tried photourl = images.get_serving_url(unicode

(upload_files[0].key())) insted of photourl = images.get_serving_url(str(upload_files[0].key()))

Answer 6

This is a known bug. http://code.google.com/p/googleappengine/issues/detail?id=3761

Getting back to the original data is a matter of:

>>> import quopri
>>> t = unicode(quopri.decodestring('=CD'), 'iso_8859-2')
>>> print t
Í