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import datetime
try:
import cPickle as pickle
except ImportError:
import pickle
from django.db import models
from django.db.models.query import QuerySet
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.core.mail import send_mail
from django.core.urlresolvers import reverse
from django.template import Context
from django.template.loader import render_to_string
from django.utils.translation import ugettext_lazy as _
from django.utils.translation import ugettext, get_language, activate
from django.contrib.sites.models import Site
from django.contrib.auth.models import User
from django.contrib.auth.models import AnonymousUser
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes import generic
QUEUE_ALL = getattr(settings, "NOTIFICATION_QUEUE_ALL", False)
class LanguageStoreNotAvailable(Exception):
pass
class NoticeType(models.Model):
label = models.CharField(_("label"), max_length=40)
display = models.CharField(_("display"), max_length=50)
description = models.CharField(_("description"), max_length=100)
# by default only on for media with sensitivity less than or equal to this number
default = models.IntegerField(_("default"))
def __unicode__(self):
return self.label
class Meta:
verbose_name = _("notice type")
verbose_name_plural = _("notice types")
# if this gets updated, the create() method below needs to be as well...
NOTICE_MEDIA = (
("1", _("Email")),
)
# how spam-sensitive is the medium
NOTICE_MEDIA_DEFAULTS = {
"1": 2 # email
}
class NoticeSetting(models.Model):
"""
Indicates, for a given user, whether to send notifications
of a given type to a given medium.
"""
user = models.ForeignKey(User, verbose_name=_("user"))
notice_type = models.ForeignKey(NoticeType, verbose_name=_("notice type"))
medium = models.CharField(_("medium"), max_length=1, choices=NOTICE_MEDIA)
send = models.BooleanField(_("send"))
class Meta:
verbose_name = _("notice setting")
verbose_name_plural = _("notice settings")
unique_together = ("user", "notice_type", "medium")
def get_notification_setting(user, notice_type, medium):
try:
return NoticeSetting.objects.get(user=user, notice_type=notice_type, medium=medium)
except NoticeSetting.DoesNotExist:
default = (NOTICE_MEDIA_DEFAULTS[medium] <= notice_type.default)
setting = NoticeSetting(user=user, notice_type=notice_type, medium=medium, send=default)
setting.save()
return setting
def should_send(user, notice_type, medium):
return get_notification_setting(user, notice_type, medium).send
class NoticeManager(models.Manager):
def notices_for(self, user, archived=False, unseen=None, on_site=None, sent=False):
"""
returns Notice objects for the given user.
If archived=False, it only include notices not archived.
If archived=True, it returns all notices for that user.
If unseen=None, it includes all notices.
If unseen=True, return only unseen notices.
If unseen=False, return only seen notices.
"""
if sent:
lookup_kwargs = {"sender": user}
else:
lookup_kwargs = {"recipient": user}
qs = self.filter(**lookup_kwargs)
nqs = []
for each in qs:
nqs.append(each.message)
if not archived:
self.filter(archived=archived)
if unseen is not None:
qs = qs.filter(unseen=unseen)
if on_site is not None:
qs = qs.filter(on_site=on_site)
return nqs
def unseen_count_for(self, recipient, **kwargs):
"""
returns the number of unseen notices for the given user but does not
mark them seen
"""
return self.notices_for(recipient, unseen=True, **kwargs).count()
def received(self, recipient, **kwargs):
"""
returns notices the given recipient has recieved.
"""
kwargs["sent"] = False
return self.notices_for(recipient, **kwargs)
def sent(self, sender, **kwargs):
"""
returns notices the given sender has sent
"""
kwargs["sent"] = True
return self.notices_for(sender, **kwargs)
class Notice(models.Model):
recipient = models.ForeignKey(User, related_name="recieved_notices", verbose_name=_("recipient"))
sender = models.ForeignKey(User, null=True, related_name="sent_notices", verbose_name=_("sender"))
message = models.TextField(_("message"))
notice_type = models.ForeignKey(NoticeType, verbose_name=_("notice type"))
added = models.DateTimeField(_("added"), default=datetime.datetime.now)
unseen = models.BooleanField(_("unseen"), default=True)
archived = models.BooleanField(_("archived"), default=False)
on_site = models.BooleanField(_("on site"))
objects = NoticeManager()
def __unicode__(self):
return self.message
def archive(self):
self.archived = True
self.save()
def is_unseen(self):
"""
returns value of self.unseen but also changes it to false.
Use this in a template to mark an unseen notice differently the first
time it is shown.
"""
unseen = self.unseen
if unseen:
self.unseen = False
self.save()
return unseen
class Meta:
ordering = ["-added"]
verbose_name = _("notice")
verbose_name_plural = _("notices")
def get_absolute_url(self):
return reverse("notification_notice", args=[str(self.pk)])
class NoticeQueueBatch(models.Model):
"""
A queued notice.
Denormalized data for a notice.
"""
pickled_data = models.TextField()
def create_notice_type(label, display, description, default=2, verbosity=1):
"""
Creates a new NoticeType.
This is intended to be used by other apps as a post_syncdb manangement step.
"""
try:
notice_type = NoticeType.objects.get(label=label)
updated = False
if display != notice_type.display:
notice_type.display = display
updated = True
if description != notice_type.description:
notice_type.description = description
updated = True
if default != notice_type.default:
notice_type.default = default
updated = True
if updated:
notice_type.save()
if verbosity > 1:
print "Updated %s NoticeType" % label
except NoticeType.DoesNotExist:
NoticeType(label=label, display=display, description=description, default=default).save()
if verbosity > 1:
print "Created %s NoticeType" % label
def get_notification_language(user):
"""
Returns site-specific notification language for this user. Raises
LanguageStoreNotAvailable if this site does not use translated
notifications.
"""
if getattr(settings, "NOTIFICATION_LANGUAGE_MODULE", False):
try:
app_label, model_name = settings.NOTIFICATION_LANGUAGE_MODULE.split(".")
model = models.get_model(app_label, model_name)
language_model = model._default_manager.get(user__id__exact=user.id)
if hasattr(language_model, "language"):
return language_model.language
except (ImportError, ImproperlyConfigured, model.DoesNotExist):
raise LanguageStoreNotAvailable
raise LanguageStoreNotAvailable
def get_formatted_messages(formats, label, context):
"""
Returns a dictionary with the format identifier as the key. The values are
are fully rendered templates with the given context.
"""
format_templates = {}
for format in formats:
# conditionally turn off autoescaping for .txt extensions in format
if format.endswith(".txt"):
context.autoescape = False
else:
context.autoescape = True
print label,"labels"
format_templates[format] = label #("gstudio/notification/%s/%s" % (label, format),
#"gstudio/notification/%s" % format)
return format_templates
def send_now(users, label, extra_context=None, on_site=True, sender=None):
"""
Creates a new notice.
This is intended to be how other apps create new notices.
notification.send(user, "friends_invite_sent", {
"spam": "eggs",
"foo": "bar",
)
You can pass in on_site=False to prevent the notice emitted from being
displayed on the site.
"""
if extra_context is None:
extra_context = {}
notice_type = NoticeType.objects.get(label=label)
protocol = getattr(settings, "DEFAULT_HTTP_PROTOCOL", "http")
current_site = Site.objects.get_current()
notices_url = u"%s://%s%s" % (
protocol,
unicode(current_site),
reverse("notification_notices"),
)
current_language = get_language()
formats = (
"short.txt",
"full.txt",
"notice.html",
"full.html",
) # TODO make formats configurable
for user in users:
recipients = []
# get user language for user from language store defined in
# NOTIFICATION_LANGUAGE_MODULE setting
try:
language = get_notification_language(user)
except LanguageStoreNotAvailable:
language = None
if language is not None:
# activate the user's language
activate(language)
# update context with user specific translations
context = Context({
"recipient": user,
"sender": sender,
"notice": ugettext(notice_type.display),
"notices_url": notices_url,
"current_site": current_site,
})
context.update(extra_context)
# get prerendered format messages
messages = get_formatted_messages(formats, label, context)
# Strip newlines from subject
subject = "".join(render_to_string("gstudio/notification/email_subject.txt", {
"message": messages["short.txt"],
}, context).splitlines())
body = render_to_string("gstudio/notification/email_body.txt", {
"message": messages["full.txt"],
}, context)
notice = Notice.objects.create(recipient=user, message=messages["notice.html"],
notice_type=notice_type, on_site=on_site, sender=sender)
if should_send(user, notice_type, "1") and user.email and user.is_active: # Email
recipients.append(user.email)
send_mail(subject, body, settings.DEFAULT_FROM_EMAIL, recipients)
# reset environment to original language
activate(current_language)
def send(*args, **kwargs):
"""
A basic interface around both queue and send_now. This honors a global
flag NOTIFICATION_QUEUE_ALL that helps determine whether all calls should
be queued or not. A per call ``queue`` or ``now`` keyword argument can be
used to always override the default global behavior.
"""
queue_flag = kwargs.pop("queue", False)
now_flag = kwargs.pop("now", False)
assert not (queue_flag and now_flag), "'queue' and 'now' cannot both be True."
if queue_flag:
return queue(*args, **kwargs)
elif now_flag:
return send_now(*args, **kwargs)
else:
if QUEUE_ALL:
return queue(*args, **kwargs)
else:
return send_now(*args, **kwargs)
def queue(users, label, extra_context=None, on_site=True, sender=None):
"""
Queue the notification in NoticeQueueBatch. This allows for large amounts
of user notifications to be deferred to a seperate process running outside
the webserver.
"""
if extra_context is None:
extra_context = {}
if isinstance(users, QuerySet):
users = [row["pk"] for row in users.values("pk")]
else:
users = [user.pk for user in users]
notices = []
for user in users:
notices.append((user, label, extra_context, on_site, sender))
NoticeQueueBatch(pickled_data=pickle.dumps(notices).encode("base64")).save()
class ObservedItemManager(models.Manager):
def all_for(self, observed, signal):
"""
Returns all ObservedItems for an observed object,
to be sent when a signal is emited.
"""
content_type = ContentType.objects.get_for_model(observed)
observed_items = self.filter(content_type=content_type, object_id=observed.id, signal=signal)
return observed_items
def get_for(self, observed, observer, signal):
content_type = ContentType.objects.get_for_model(observed)
observed_item = self.get(content_type=content_type, object_id=observed.id, user=observer, signal=signal)
return observed_item
class ObservedItem(models.Model):
user = models.ForeignKey(User, verbose_name=_("user"))
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
observed_object = generic.GenericForeignKey("content_type", "object_id")
notice_type = models.ForeignKey(NoticeType, verbose_name=_("notice type"))
added = models.DateTimeField(_("added"), default=datetime.datetime.now)
# the signal that will be listened to send the notice
signal = models.TextField(verbose_name=_("signal"))
objects = ObservedItemManager()
class Meta:
ordering = ["-added"]
verbose_name = _("observed item")
verbose_name_plural = _("observed items")
def send_notice(self, extra_context=None):
if extra_context is None:
extra_context = {}
extra_context.update({"observed": self.observed_object})
send([self.user], self.notice_type.label, extra_context)
def observe(observed, observer, notice_type_label, signal="post_save"):
"""
Create a new ObservedItem.
To be used by applications to register a user as an observer for some object.
"""
notice_type = NoticeType.objects.get(label=notice_type_label)
observed_item = ObservedItem(
user=observer, observed_object=observed,
notice_type=notice_type, signal=signal
)
observed_item.save()
return observed_item
def stop_observing(observed, observer, signal="post_save"):
"""
Remove an observed item.
"""
observed_item = ObservedItem.objects.get_for(observed, observer, signal)
observed_item.delete()
def send_observation_notices_for(observed, signal="post_save", extra_context=None):
"""
Send a notice for each registered user about an observed object.
"""
if extra_context is None:
extra_context = {}
observed_items = ObservedItem.objects.all_for(observed, signal)
for observed_item in observed_items:
observed_item.send_notice(extra_context)
return observed_items
def is_observing(observed, observer, signal="post_save"):
if isinstance(observer, AnonymousUser):
return False
try:
observed_items = ObservedItem.objects.get_for(observed, observer, signal)
return True
except ObservedItem.DoesNotExist:
return False
except ObservedItem.MultipleObjectsReturned:
return True
def handle_observations(sender, instance, *args, **kw):
send_observation_notices_for(instance)
|