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# Copyright 2011 GRNET S.A. All rights reserved.
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# 
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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# 
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#   1. Redistributions of source code must retain the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer.
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# 
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#   2. Redistributions in binary form must reproduce the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer in the documentation and/or other materials
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#      provided with the distribution.
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# 
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# 
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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import logging
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from django.utils.translation import ugettext as _
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from django.template.loader import render_to_string
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from django.core.mail import send_mail
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from django.core.urlresolvers import reverse
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from urlparse import urljoin
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from random import randint
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from astakos.im.settings import DEFAULT_CONTACT_EMAIL, DEFAULT_FROM_EMAIL, SITENAME, BASEURL
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from astakos.im.models import Invitation
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logger = logging.getLogger(__name__)
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def activate(user, email_template_name='im/welcome_email.txt'):
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    """
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    Activates the specific user and sends email.
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    Raises SMTPException, socket.error
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    """
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    user.is_active = True
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    user.save()
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    subject = _('Welcome to %s' % SITENAME)
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    message = render_to_string(email_template_name, {
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                'user': user,
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                'url': urljoin(BASEURL, reverse('astakos.im.views.index')),
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                'baseurl': BASEURL,
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                'site_name': SITENAME,
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                'support': DEFAULT_CONTACT_EMAIL})
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    sender = DEFAULT_FROM_EMAIL
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    send_mail(subject, message, sender, [user.email])
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    logger.info('Sent greeting %s', user)
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def _generate_invitation_code():
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    while True:
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        code = randint(1, 2L**63 - 1)
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        try:
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            Invitation.objects.get(code=code)
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            # An invitation with this code already exists, try again
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        except Invitation.DoesNotExist:
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            return code
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def invite(inviter, username, realname):
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    """
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    Send an invitation email and upon success reduces inviter's invitation by one.
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    Raises SMTPException, socket.error
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    """
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    code = _generate_invitation_code()
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    invitation = Invitation(inviter=inviter,
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                            username=username,
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                            code=code,
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                            realname=realname)
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    invitation.save()
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    subject = _('Invitation to %s' % SITENAME)
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    url = '%s?code=%d' % (urljoin(BASEURL, reverse('astakos.im.views.signup')), code)
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    message = render_to_string('im/invitation.txt', {
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                'invitation': invitation,
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                'url': url,
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                'baseurl': BASEURL,
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                'service': SITENAME,
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                'support': DEFAULT_CONTACT_EMAIL})
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    sender = DEFAULT_FROM_EMAIL
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    send_mail(subject, message, sender, [invitation.username])
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    logger.info('Sent invitation %s', invitation)
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    inviter.invitations = max(0, inviter.invitations - 1)
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    inviter.save()