Synnefo

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

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import logging

import datetime

from urllib import quote

from urlparse import urlsplit, urlunsplit

from functools import wraps

from datetime import tzinfo, timedelta

from django.http import HttpResponse, urlencode

from django.template import RequestContext

from django.contrib.sites.models import Site

from django.utils.translation import ugettext as _

from django.contrib.auth import login, authenticate

from django.core.urlresolvers import reverse

from astakos.im.models import AstakosUser, Invitation, ApprovalTerms

from astakos.im.settings import INVITATIONS_PER_LEVEL, COOKIE_NAME, COOKIE_DOMAIN, COOKIE_SECURE, FORCE_PROFILE_UPDATE

logger = logging.getLogger(__name__)

class UTC(tzinfo):

   def utcoffset(self, dt):

       return timedelta(0)

   def tzname(self, dt):

       return 'UTC'

   def dst(self, dt):

       return timedelta(0)

def isoformat(d):

   """Return an ISO8601 date string that includes a timezone."""

   return d.replace(tzinfo=UTC()).isoformat()

def get_or_create_user(email, realname='', first_name='', last_name='', affiliation='', level=0, provider='local', password=''):

    """Find or register a user into the internal database

       and issue a token for subsequent requests.

    """

    user, created = AstakosUser.objects.get_or_create(email=email,

        defaults={

            'password':password,

            'affiliation':affiliation,

            'level':level,

            'invitations':INVITATIONS_PER_LEVEL.get(level, 0),

            'provider':provider,

            'realname':realname,

            'first_name':first_name,

            'last_name':last_name

        })

    if created:

        user.renew_token()

        user.save()

        logger.info('Created user %s', user)

    return user

def get_context(request, extra_context={}, **kwargs):

    if not extra_context:

        extra_context = {}

    extra_context.update(kwargs)

    return RequestContext(request, extra_context)

def get_invitation(request):

    """

    Returns the invitation identified by the ``code``.

    Raises Invitation.DoesNotExist and Exception if the invitation is consumed

    """

    code = request.GET.get('code')

    if request.method == 'POST':

        code = request.POST.get('code')

    if not code:

        if 'invitation_code' in request.session:

            code = request.session.pop('invitation_code')

    if not code:

        return

    invitation = Invitation.objects.get(code = code)

    if invitation.is_consumed:

        raise ValueError(_('Invitation is used'))

    try:

        AstakosUser.objects.get(email = invitation.username)

        raise ValueError(_('Email: %s is reserved' % invitation.username))

    except AstakosUser.DoesNotExist:

        pass

    return invitation

def prepare_response(request, user, next='', renew=False):

    """Return the unique username and the token

       as 'X-Auth-User' and 'X-Auth-Token' headers,

       or redirect to the URL provided in 'next'

       with the 'user' and 'token' as parameters.

       Reissue the token even if it has not yet

       expired, if the 'renew' parameter is present

       or user has not a valid token.

    """

    renew = renew or (not user.auth_token)

    renew = renew or (user.auth_token_expires and user.auth_token_expires < datetime.datetime.now())

    if renew:

        user.renew_token()

        user.save()

    if FORCE_PROFILE_UPDATE and not user.is_verified and not user.is_superuser:

        params = ''

        if next:

            params = '?' + urlencode({'next': next})

        next = reverse('astakos.im.views.edit_profile') + params

    response = HttpResponse()

    # authenticate before login

    user = authenticate(email=user.email, auth_token=user.auth_token)

    login(request, user)

    set_cookie(response, user)

    if not next:

        next = reverse('astakos.im.views.index')

    response['Location'] = next

    response.status_code = 302

    return response

def set_cookie(response, user):

    expire_fmt = user.auth_token_expires.strftime('%a, %d-%b-%Y %H:%M:%S %Z')

    cookie_value = quote(user.email + '|' + user.auth_token)

    response.set_cookie(COOKIE_NAME, value=cookie_value,

                        expires=expire_fmt, path='/',

                        domain=COOKIE_DOMAIN, secure=COOKIE_SECURE)

class lazy_string(object):

    def __init__(self, function, *args, **kwargs):

        self.function=function

        self.args=args

        self.kwargs=kwargs

    def __str__(self):

        if not hasattr(self, 'str'):

            self.str=self.function(*self.args, **self.kwargs)

        return self.str

def reverse_lazy(*args, **kwargs):

    return lazy_string(reverse, *args, **kwargs)

def get_latest_terms():

    try:

        term = ApprovalTerms.objects.order_by('-id')[0]

        return term

    except IndexError:

        pass

    return None

def has_signed_terms(user):

    term = get_latest_terms()

    if not term:

        return True

    if not user.has_signed_terms:

        return False

    if not user.date_signed_terms:

        return False

    if user.date_signed_terms < term.date:

        user.has_signed_terms = False

        user.save()

        return False

    return True