-# code borrowed from django-registration
-# https://bitbucket.org/ubernostrum/django-registration/
-
-#DEPRECATED
-#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.
-#
-# """
-# # 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):
-# try:
-# profile = self.get(activation_key=activation_key)
-# except self.model.DoesNotExist:
-# return False
-# if not profile.activation_key_expired():
-# user = profile.user
-# user.is_active = True
-# user.save()
-# profile.activation_key = self.model.ACTIVATED
-# profile.save()
-# return user
-# return False
-#
-# def create_user(self, first_name, last_name, email, password):
-# pending_user = self.create(first_name=first_name, last_name=last_name, email=email, password=password)
-# return pending_user
-#
-# def create_inactive_user(self, first_name, last_name, email, password, site,
-# send_email=True):
-# """
-# Create a new, inactive ``User``, generate a
-# ``RegistrationProfile`` and email its activation key to the
-# ``User``, returning the new ``User``.
-#
-# By default, an activation email will be sent to the new
-# user. To disable this, pass ``send_email=False``.
-#
-# """
-# salt = hashlib.sha1(str(random.random())).hexdigest()[:5]
-# if isinstance(email, unicode):
-# email = email.encode('utf-8')
-# activation_key = hashlib.sha1(salt+email).hexdigest()
-#
-# new_user = PendingUser.objects.create_user(first_name, last_name, email, password)
-# new_user.is_active = False
-# new_user.activation_key=activation_key
-# new_user.save()
-#
-# # We might not need this
-# #registration_profile = self.create_profile(new_user)
-#
-# if send_email:
-# new_user.send_activation_email(site)
-# #registration_profile.send_activation_email(site)
-#
-# return new_user
-# create_inactive_user = transaction.commit_on_success(create_inactive_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 = hashlib.sha1(str(random.random())).hexdigest()[:5]
-# username = user.username
-# if isinstance(username, unicode):
-# username = username.encode('utf-8')
-# activation_key = hashlib.sha1(salt+username).hexdigest()
-# return self.create(user=user,
-# activation_key=activation_key)
-#
-# 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 self.all():
-# try:
-# if profile.activation_key_expired():
-# user = profile.user
-# if not user.is_active:
-# user.delete()
-# profile.delete()
-# except User.DoesNotExist:
-# profile.delete()
-#DEPRECATED
-