[1.7.x] Fixed #23333 -- Made urlsafe_base64_decode() return proper type on Python 3.

from email.utils import formatdate

from django.utils.datastructures import MultiValueDict

from django.utils.encoding import force_str, force_text

from django.utils.encoding import force_bytes, force_str, force_text

from django.utils.functional import allow_lazy

from django.utils import six

from django.utils.six.moves.urllib.parse import (

    Decodes a base64 encoded string, adding back any trailing equal signs that

    might have been stripped.

    """

    s = s.encode('utf-8')  # base64encode should only return ASCII.

    s = force_bytes(s)

    try:

        return base64.urlsafe_b64decode(s.ljust(len(s) + len(s) % 4, b'='))

    except (LookupError, BinasciiError) as e:

* Fixed missing ``get_or_create`` and ``update_or_create`` on related managers

  causing ``IntegrityError`` (:ticket:`23611`).

* Made :func:`~django.utils.http.urlsafe_base64_decode` return the proper

  type (byte string) on Python 3 (:ticket:`23333`).

                     '/url%20with%20spaces/'):

            self.assertTrue(http.is_safe_url(good_url, host='testserver'), "%s should be allowed" % good_url)

    def test_urlsafe_base64_roundtrip(self):

        bytestring = b'foo'

        encoded = http.urlsafe_base64_encode(bytestring)

        decoded = http.urlsafe_base64_decode(encoded)

        self.assertEqual(bytestring, decoded)

class ETagProcessingTests(unittest.TestCase):

    def test_parsing(self):