Synnefo

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

# 

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

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#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

# 

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

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import logging

import socket

from django.utils.translation import ugettext as _

from django.template.loader import render_to_string

from django.core.mail import send_mail

from django.core.urlresolvers import reverse

from django.core.exceptions import ValidationError

from django.template import Context, loader

from django.contrib.auth import login as auth_login, logout as auth_logout

from django.http import HttpRequest

from urllib import quote

from urlparse import urljoin

from smtplib import SMTPException

from datetime import datetime

from functools import wraps

from astakos.im.settings import DEFAULT_CONTACT_EMAIL, DEFAULT_FROM_EMAIL, \

    SITENAME, BASEURL, DEFAULT_ADMIN_EMAIL, LOGGING_LEVEL, \

    VERIFICATION_EMAIL_SUBJECT, ADMIN_NOTIFICATION_EMAIL_SUBJECT, \

    HELPDESK_NOTIFICATION_EMAIL_SUBJECT, INVITATION_EMAIL_SUBJECT, \

    GREETING_EMAIL_SUBJECT, FEEDBACK_EMAIL_SUBJECT, EMAIL_CHANGE_EMAIL_SUBJECT

from astakos.im.models import Invitation, AstakosUser

logger = logging.getLogger(__name__)

def logged(func, msg):

    @wraps(func)

    def with_logging(*args, **kwargs):

        email = ''

        user = None

        if len(args) == 2 and isinstance(args[1], AstakosUser):

            user = args[1]

        elif len(args) == 1 and isinstance(args[0], HttpRequest):

            request = args[0]

            user = request.user

        email = user.email if user and user.is_authenticated() else ''

        r = func(*args, **kwargs)

        if LOGGING_LEVEL:

            logger._log(LOGGING_LEVEL, msg % email, [])

        return r

    return with_logging

login = logged(auth_login, '%s logged in.')

logout = logged(auth_logout, '%s logged out.')

def send_verification(user, template_name='im/activation_email.txt'):

    """

    Send email to user to verify his/her email and activate his/her account.

    Raises SendVerificationError

    """

    url = '%s?auth=%s&next=%s' % (urljoin(BASEURL, reverse('astakos.im.views.activate')),

                                    quote(user.auth_token),

                                    quote(urljoin(BASEURL, reverse('astakos.im.views.index'))))

    message = render_to_string(template_name, {

            'user': user,

            'url': url,

            'baseurl': BASEURL,

            'site_name': SITENAME,

            'support': DEFAULT_CONTACT_EMAIL})

    sender = DEFAULT_FROM_EMAIL

    try:

        send_mail(_(VERIFICATION_EMAIL_SUBJECT), message, sender, [user.email])

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendVerificationError()

    else:

        msg = 'Sent activation %s' % user.email

        logger._log(LOGGING_LEVEL, msg, [])

def send_activation(user, template_name='im/activation_email.txt'):

    send_verification(user, template_name)

    user.activation_sent = datetime.now()

    user.save()

def send_admin_notification(user, template_name='im/admin_notification.txt'):

    """

    Send email to DEFAULT_ADMIN_EMAIL to notify for a new user registration.

    Raises SendNotificationError

    """

    if not DEFAULT_ADMIN_EMAIL:

        return

    message = render_to_string(template_name, {

            'user': user,

            'baseurl': BASEURL,

            'site_name': SITENAME,

            'support': DEFAULT_CONTACT_EMAIL})

    sender = DEFAULT_FROM_EMAIL

    try:

        send_mail(_(ADMIN_NOTIFICATION_EMAIL_SUBJECT) % {'user': user.email}, message, sender, [DEFAULT_ADMIN_EMAIL])

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendNotificationError()

    else:

        msg = 'Sent admin notification for user %s' % user.email

        logger._log(LOGGING_LEVEL, msg, [])

def send_helpdesk_notification(user, template_name='im/helpdesk_notification.txt'):

    """

    Send email to DEFAULT_CONTACT_EMAIL to notify for a new user activation.

    Raises SendNotificationError

    """

    if not DEFAULT_CONTACT_EMAIL:

        return

    message = render_to_string(template_name, {

            'user': user,

            'baseurl': BASEURL,

            'site_name': SITENAME,

            'support': DEFAULT_ADMIN_EMAIL})

    sender = DEFAULT_FROM_EMAIL

    try:

        send_mail(_(HELPDESK_NOTIFICATION_EMAIL_SUBJECT) % {'user': user.email}, message, sender, [DEFAULT_CONTACT_EMAIL])

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendNotificationError()

    else:

        msg = 'Sent helpdesk admin notification for user %s' % user.email

        logger._log(LOGGING_LEVEL, msg, [])

def send_invitation(invitation, template_name='im/invitation.txt'):

    """

    Send invitation email.

    Raises SendInvitationError

    """

    subject = _(INVITATION_EMAIL_SUBJECT)

    url = '%s?code=%d' % (urljoin(BASEURL, reverse('astakos.im.views.index')), invitation.code)

    message = render_to_string('im/invitation.txt', {

                'invitation': invitation,

                'url': url,

                'baseurl': BASEURL,

                'site_name': SITENAME,

                'support': DEFAULT_CONTACT_EMAIL})

    sender = DEFAULT_FROM_EMAIL

    try:

        send_mail(subject, message, sender, [invitation.username])

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendInvitationError()

    else:

        msg = 'Sent invitation %s' % invitation

        logger._log(LOGGING_LEVEL, msg, [])

def send_greeting(user, email_template_name='im/welcome_email.txt'):

    """

    Send welcome email.

    Raises SMTPException, socket.error

    """

    subject = _(GREETING_EMAIL_SUBJECT)

    message = render_to_string(email_template_name, {

                'user': user,

                'url': urljoin(BASEURL, reverse('astakos.im.views.index')),

                'baseurl': BASEURL,

                'site_name': SITENAME,

                'support': DEFAULT_CONTACT_EMAIL})

    sender = DEFAULT_FROM_EMAIL

    try:

        send_mail(subject, message, sender, [user.email])

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendGreetingError()

    else:

        msg = 'Sent greeting %s' % user.email

        logger._log(LOGGING_LEVEL, msg, [])

def send_feedback(msg, data, user, email_template_name='im/feedback_mail.txt'):

    subject = _(FEEDBACK_EMAIL_SUBJECT)

    from_email = user.email

    recipient_list = [DEFAULT_CONTACT_EMAIL]

    content = render_to_string(email_template_name, {

        'message': msg,

        'data': data,

        'user': user})

    try:

        send_mail(subject, content, from_email, recipient_list)

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendFeedbackError()

    else:

        msg = 'Sent feedback from %s' % user.email

        logger._log(LOGGING_LEVEL, msg, [])

def send_change_email(ec, request, email_template_name='registration/email_change_email.txt'):

    try:

        url = reverse('email_change_confirm',

                      kwargs={'activation_key':ec.activation_key})

        url = request.build_absolute_uri(url)

        t = loader.get_template(email_template_name)

        c = {'url': url, 'site_name': SITENAME}

        from_email = DEFAULT_FROM_EMAIL

        send_mail(_(EMAIL_CHANGE_EMAIL_SUBJECT),

            t.render(Context(c)), from_email, [ec.new_email_address])

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise ChangeEmailError()

    else:

        msg = 'Sent change email for %s' % ec.user.email

        logger._log(LOGGING_LEVEL, msg, [])

def activate(user, email_template_name='im/welcome_email.txt',

                helpdesk_email_template_name='im/helpdesk_notification.txt', verify_email=False):

    """

    Activates the specific user and sends email.

    Raises SendGreetingError, ValidationError

    """

    user.is_active = True

    if verify_email:

        user.email_verified = True

    user.save()

    send_helpdesk_notification(user, helpdesk_email_template_name)

    send_greeting(user, email_template_name)

def invite(invitation, inviter, email_template_name='im/welcome_email.txt'):

    """

    Send an invitation email and upon success reduces inviter's invitation by one.

    Raises SendInvitationError

    """

    invitation.inviter = inviter

    invitation.save()

    send_invitation(invitation, email_template_name)

    inviter.invitations = max(0, inviter.invitations - 1)

    inviter.save()

def set_user_credibility(email, has_credits):

    try:

        user = AstakosUser.objects.get(email=email, is_active=True)

        user.has_credits = has_credits

        user.save()

    except AstakosUser.DoesNotExist, e:

        logger.exception(e)

    except ValidationError, e:

        logger.exception(e)

class SendMailError(Exception):

    pass

class SendAdminNotificationError(SendMailError):

    def __init__(self):

        self.message = _('Failed to send notification')

        super(SendAdminNotificationError, self).__init__()

class SendVerificationError(SendMailError):

    def __init__(self):

        self.message = _('Failed to send verification')

        super(SendVerificationError, self).__init__()

class SendInvitationError(SendMailError):

    def __init__(self):

        self.message = _('Failed to send invitation')

        super(SendInvitationError, self).__init__()

class SendGreetingError(SendMailError):

    def __init__(self):

        self.message = _('Failed to send greeting')

        super(SendGreetingError, self).__init__()

class SendFeedbackError(SendMailError):

    def __init__(self):

        self.message = _('Failed to send feedback')

        super(SendFeedbackError, self).__init__()

class ChangeEmailError(SendMailError):

    def __init__(self):

        self.message = _('Failed to send change email')

        super(ChangeEmailError, self).__init__()

class SendNotificationError(SendMailError):

    def __init__(self):

        self.message = _('Failed to send notification email')

        super(SendNotificationError, self).__init__()