Synnefo

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

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#      disclaimer in the documentation and/or other materials

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import logging

from urllib import quote, unquote

from django.contrib.auth.models import AnonymousUser

from django.http import HttpRequest

from django.utils.translation import ugettext as _

from astakos.im.settings import (

    COOKIE_NAME, COOKIE_DOMAIN, COOKIE_SECURE, LOGGING_LEVEL

)

logger = logging.getLogger(__name__)

class Cookie():

    def __init__(self, request, response=None):

        cookies = getattr(request, 'COOKIES', {})

        cookie = unquote(cookies.get(COOKIE_NAME, ''))

        self.email, sep, self.auth_token = cookie.partition('|')

        self.request = request

        self.response = response

    @property

    def email(self):

        return getattr(self, 'email', '')

    @property

    def auth_token(self):

        return getattr(self, 'auth_token', '')

    @property

    def is_set(self):

        no_token = not self.auth_token 

        return not no_token

    @property

    def is_valid(self):

        return self.email == getattr(self.user, 'email', '') and \

            self.auth_token == getattr(self.user, 'auth_token', '')

    @property

    def user(self):

        return getattr(self.request, 'user', AnonymousUser())

    def __set(self):

        if not self.response:

            raise ValueError(_('There is no response.'))

        user = self.user

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

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

        self.response.set_cookie(

            COOKIE_NAME, value=cookie_value, expires=expire_fmt, path='/',

            domain=COOKIE_DOMAIN, secure=COOKIE_SECURE

        )

        msg = 'Cookie [expiring %(auth_token_expires)s] set for %(email)s' % user.__dict__

        logger._log(LOGGING_LEVEL, msg, [])

    def __delete(self):

        if not self.response:

            raise ValueError(_('There is no response.'))

        self.response.delete_cookie(COOKIE_NAME, path='/', domain=COOKIE_DOMAIN)

        msg = 'Cookie deleted for %(email)s' % self.__dict__

        logger._log(LOGGING_LEVEL, msg, [])

    def fix(self, response=None):

        self.response = response or self.response

        if self.user.is_authenticated():

            if not self.is_set or not self.is_valid:

                self.__set()

        else:

            if self.is_set:

                self.__delete()