Synnefo

# Copyright 2011-2012 GRNET S.A. All rights reserved.

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import logging

import socket

from smtplib import SMTPException

from django.conf import settings

from django.core.mail import send_mail, get_connection

from django.utils.translation import ugettext as _

from django.template.loader import render_to_string

import astakos.im.messages as astakos_messages

logger = logging.getLogger(__name__)

def build_notification(

    sender, recipients, subject, message=None, template=None, dictionary=None):

    return EmailNotification(

        sender, recipients, subject, message, template, dictionary)

class Notification(object):

    def __init__(

        self, sender, recipients, subject,

        message=None, template=None, dictionary=None):

        if not message and not template:

            raise IOError('message and template cannot be both None.')

        dictionary = dictionary or {}

        self.sender = sender

        self.recipients = recipients

        self.subject = subject

        self.message = message or render_to_string(template, dictionary)

    def send(self):

        pass

class EmailNotification(Notification):

    def send(self):

        try:

            send_mail(

                self.subject,

                self.message,

                self.sender,

                self.recipients,

                connection=get_connection())

        except (SMTPException, socket.error), e:

            logger.exception(e)

            raise NotificationError(self)

class NotificationError(Exception):

    def __init__(self, nofication):

        self.message = _(astakos_messages.DETAILED_NOTIFICATION_SEND_ERR) % nofication.__dict__

        super(NotificationError, self).__init__()