Split the list view code up in three pieces
1. getListContents which returns the required contents dictionary
2. _list which returns the response for a specified list of contents
3. list which constructs just one content dict and passes it to _list
This way it is easier to do step 1 and 2 in other code than list(),
which makes it possible to display multiple list pages (by calling
getListContents multiple times and passing the result to _list).
import base64
import cPickle as pickle
from django.db import models
from django.utils.translation import ugettext_lazy as _
from django.conf import settings
from django.utils.hashcompat import md5_constructor
class SessionManager(models.Manager):
def encode(self, session_dict):
"""
Returns the given session dictionary pickled and encoded as a string.
"""
pickled = pickle.dumps(session_dict)
pickled_md5 = md5_constructor(pickled + settings.SECRET_KEY).hexdigest()
return base64.encodestring(pickled + pickled_md5)
def save(self, session_key, session_dict, expire_date):
s = self.model(session_key, self.encode(session_dict), expire_date)
if session_dict:
s.save()
else:
s.delete() # Clear sessions with no data.
return s
class Session(models.Model):
"""
Django provides full support for anonymous sessions. The session
framework lets you store and retrieve arbitrary data on a
per-site-visitor basis. It stores data on the server side and
abstracts the sending and receiving of cookies. Cookies contain a
session ID -- not the data itself.
The Django sessions framework is entirely cookie-based. It does
not fall back to putting session IDs in URLs. This is an intentional
design decision. Not only does that behavior make URLs ugly, it makes
your site vulnerable to session-ID theft via the "Referer" header.
For complete documentation on using Sessions in your code, consult
the sessions documentation that is shipped with Django (also available
on the Django website).
"""
session_key = models.CharField(_('session key'), max_length=40,
primary_key=True)
session_data = models.TextField(_('session data'))
expire_date = models.DateTimeField(_('expire date'))
objects = SessionManager()
class Meta:
db_table = 'django_session'
verbose_name = _('session')
verbose_name_plural = _('sessions')
def get_decoded(self):
encoded_data = base64.decodestring(self.session_data)
pickled, tamper_check = encoded_data[:-32], encoded_data[-32:]
if md5_constructor(pickled + settings.SECRET_KEY).hexdigest() != tamper_check:
from django.core.exceptions import SuspiciousOperation
raise SuspiciousOperation, "User tampered with session cookie."
try:
return pickle.loads(pickled)
# Unpickling can cause a variety of exceptions. If something happens,
# just return an empty dictionary (an empty session).
except:
return {}