appengine_config.py

import base64
import quopri

from webob import multidict


def from_fieldstorage(cls, fs):
    """
    Create a dict from a cgi.FieldStorage instance
    """
    obj = cls()
    if fs.list:
        # fs.list can be None when there's nothing to parse
        for field in fs.list:
            if field.filename:
                obj.add(field.name, field)
            else:

                # first, set a common charset to utf-8.
                common_charset = 'utf-8'

                # second, check Content-Transfer-Encoding and decode
                # the value appropriately
                field_value = field.value
                transfer_encoding = field.headers.get(
                  'Content-Transfer-Encoding', None)

                if transfer_encoding == 'base64':
                    field_value = base64.b64decode(field_value)

                if transfer_encoding == 'quoted-printable':
                    field_value = quopri.decodestring(field_value)

                if field.type_options.has_key('charset') and \
                      field.type_options['charset'] != common_charset:
                    # decode with a charset specified in each
                    # multipart, and then encode it again with a
                    # charset specified in top level FieldStorage
                    field_value = field_value.decode(
                      field.type_options['charset']).encode(common_charset)
            
                obj.add(field.name, field_value)

    return obj

multidict.MultiDict.from_fieldstorage = classmethod(from_fieldstorage)