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import datetime
import random
import re
import sha
from google.appengine.ext import db
from django.conf import settings
from django.contrib.auth.models import User
from django.contrib.sites.models import Site
from django.db import models
from django.template.loader import render_to_string
from django.utils.translation import ugettext_lazy as _
SHA1_RE = re.compile('^[a-f0-9]{40}$')
class RegistrationManager(models.Manager):
"""
Custom manager for the ``RegistrationProfile`` model.
The methods defined here provide shortcuts for account creation
and activation (including generation and emailing of activation
keys), and for cleaning out expired inactive accounts.
"""
def activate_user(self, activation_key):
"""
Validate an activation key and activate the corresponding
``User`` if valid.
If the key is valid and has not expired, return the ``User``
after activating.
If the key is not valid or has expired, return ``False``.
If the key is valid but the ``User`` is already active,
return ``False``.
To prevent reactivation of an account which has been
deactivated by site administrators, the activation key is
reset to the string constant ``RegistrationProfile.ACTIVATED``
after successful activation.
To execute customized logic when a ``User`` is activated,
connect a function to the signal
``registration.signals.user_activated``; this signal will be
sent (with the ``User`` as the value of the keyword argument
``user``) after a successful activation.
"""
from registration.signals import user_activated
# Make sure the key we're trying conforms to the pattern of a
# SHA1 hash; if it doesn't, no point trying to look it up in
# the database.
if SHA1_RE.search(activation_key):
profile = RegistrationProfile.get_by_key_name("key_"+activation_key)
if not profile:
return False
if not profile.activation_key_expired():
user = profile.user
user.is_active = True
user.put()
profile.activation_key = RegistrationProfile.ACTIVATED
profile.put()
user_activated.send(sender=self.model, user=user)
return user
return False
def create_inactive_user(self, username, password, email, domain_override="",
send_email=True):
"""
Create a new, inactive ``User``, generate a
``RegistrationProfile`` and email its activation key to the
``User``, returning the new ``User``.
To disable the email, call with ``send_email=False``.
The activation email will make use of two templates:
``registration/activation_email_subject.txt``
This template will be used for the subject line of the
email. It receives one context variable, ``site``, which
is the currently-active
``django.contrib.sites.models.Site`` instance. Because it
is used as the subject line of an email, this template's
output **must** be only a single line of text; output
longer than one line will be forcibly joined into only a
single line.
``registration/activation_email.txt``
This template will be used for the body of the email. It
will receive three context variables: ``activation_key``
will be the user's activation key (for use in constructing
a URL to activate the account), ``expiration_days`` will
be the number of days for which the key will be valid and
``site`` will be the currently-active
``django.contrib.sites.models.Site`` instance.
To execute customized logic once the new ``User`` has been
created, connect a function to the signal
``registration.signals.user_registered``; this signal will be
sent (with the new ``User`` as the value of the keyword
argument ``user``) after the ``User`` and
``RegistrationProfile`` have been created, and the email (if
any) has been sent..
"""
from registration.signals import user_registered
# prepend "key_" to the key_name, because key_names can't start with numbers
new_user = User(username=username, key_name="key_"+username.lower(),
email=email, is_active=False)
new_user.set_password(password)
new_user.put()
registration_profile = self.create_profile(new_user)
if send_email:
from django.core.mail import send_mail
current_site = domain_override
# current_site = Site.objects.get_current()
subject = render_to_string('registration/activation_email_subject.txt',
{ 'site': current_site })
# Email subject *must not* contain newlines
subject = ''.join(subject.splitlines())
message = render_to_string('registration/activation_email.txt',
{ 'activation_key': registration_profile.activation_key,
'expiration_days': settings.ACCOUNT_ACTIVATION_DAYS,
'site': current_site })
send_mail(subject, message, settings.DEFAULT_FROM_EMAIL, [new_user.email])
user_registered.send(sender=self.model, user=new_user)
return new_user
def create_profile(self, user):
"""
Create a ``RegistrationProfile`` for a given
``User``, and return the ``RegistrationProfile``.
The activation key for the ``RegistrationProfile`` will be a
SHA1 hash, generated from a combination of the ``User``'s
username and a random salt.
"""
salt = sha.new(str(random.random())).hexdigest()[:5]
activation_key = sha.new(salt+user.username).hexdigest()
# prepend "key_" to the key_name, because key_names can't start with numbers
registrationprofile = RegistrationProfile(user=user, activation_key=activation_key, key_name="key_"+activation_key)
registrationprofile.put()
return registrationprofile
def delete_expired_users(self):
"""
Remove expired instances of ``RegistrationProfile`` and their
associated ``User``s.
Accounts to be deleted are identified by searching for
instances of ``RegistrationProfile`` with expired activation
keys, and then checking to see if their associated ``User``
instances have the field ``is_active`` set to ``False``; any
``User`` who is both inactive and has an expired activation
key will be deleted.
It is recommended that this method be executed regularly as
part of your routine site maintenance; this application
provides a custom management command which will call this
method, accessible as ``manage.py cleanupregistration``.
Regularly clearing out accounts which have never been
activated serves two useful purposes:
1. It alleviates the ocasional need to reset a
``RegistrationProfile`` and/or re-send an activation email
when a user does not receive or does not act upon the
initial activation email; since the account will be
deleted, the user will be able to simply re-register and
receive a new activation key.
2. It prevents the possibility of a malicious user registering
one or more accounts and never activating them (thus
denying the use of those usernames to anyone else); since
those accounts will be deleted, the usernames will become
available for use again.
If you have a troublesome ``User`` and wish to disable their
account while keeping it in the database, simply delete the
associated ``RegistrationProfile``; an inactive ``User`` which
does not have an associated ``RegistrationProfile`` will not
be deleted.
"""
for profile in RegistrationProfile.all():
if profile.activation_key_expired():
user = profile.user
if not user.is_active:
user.delete()
profile.delete()
class RegistrationProfile(db.Model):
"""
A simple profile which stores an activation key for use during
user account registration.
Generally, you will not want to interact directly with instances
of this model; the provided manager includes methods
for creating and activating new accounts, as well as for cleaning
out accounts which have never been activated.
While it is possible to use this model as the value of the
``AUTH_PROFILE_MODULE`` setting, it's not recommended that you do
so. This model's sole purpose is to store data temporarily during
account registration and activation.
"""
ACTIVATED = u"ALREADY_ACTIVATED"
user = db.ReferenceProperty(User, verbose_name=_('user'))
activation_key = db.StringProperty(_('activation key'))
objects = RegistrationManager()
class Meta:
verbose_name = _('registration profile')
verbose_name_plural = _('registration profiles')
def __unicode__(self):
return u"Registration information for %s" % self.user
def activation_key_expired(self):
"""
Determine whether this ``RegistrationProfile``'s activation
key has expired, returning a boolean -- ``True`` if the key
has expired.
Key expiration is determined by a two-step process:
1. If the user has already activated, the key will have been
reset to the string constant ``ACTIVATED``. Re-activating
is not permitted, and so this method returns ``True`` in
this case.
2. Otherwise, the date the user signed up is incremented by
the number of days specified in the setting
``ACCOUNT_ACTIVATION_DAYS`` (which should be the number of
days after signup during which a user is allowed to
activate their account); if the result is less than or
equal to the current date, the key has expired and this
method returns ``True``.
"""
expiration_date = datetime.timedelta(days=settings.ACCOUNT_ACTIVATION_DAYS)
return self.activation_key == RegistrationProfile.ACTIVATED or \
(self.user.date_joined + expiration_date <= datetime.datetime.now())
activation_key_expired.boolean = True