Synnefo

# Copyright 2011-2012 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:

#

#   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.

#

# 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,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

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

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

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

import logging

from urllib import quote, unquote

from django.contrib.auth.models import AnonymousUser

from django.utils.translation import ugettext as _

from astakos.im import settings

import astakos.im.messages as astakos_messages

logger = logging.getLogger(__name__)

class CookieHandler():

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

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

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

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

        self.request = request

        self.response = response

    @property

    def uuid(self):

        return getattr(self, 'uuid', '')

    @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):

        cookie_attribute = ('uuid' if not settings.TRANSLATE_UUIDS

                            else 'username')

        return (self.uuid == getattr(self.user, cookie_attribute, '') 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(_(astakos_messages.NO_RESPONSE))

        user = self.user

        expire_fmt = user.auth_token_expires.strftime(

            '%a, %d-%b-%Y %H:%M:%S %Z')

        if settings.TRANSLATE_UUIDS:

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

        else:

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

        self.response.set_cookie(

            settings.COOKIE_NAME, value=cookie_value, expires=expire_fmt,

            path='/', domain=settings.COOKIE_DOMAIN,

            secure=settings.COOKIE_SECURE)

        msg = 'Cookie [expiring %s] set for %s'

        logger.log(settings.LOGGING_LEVEL, msg, user.auth_token_expires,

                   user.uuid)

    def __delete(self):

        if not self.response:

            raise ValueError(_(astakos_messages.NO_RESPONSE))

        self.response.delete_cookie(

            settings.COOKIE_NAME, path='/', domain=settings.COOKIE_DOMAIN)

        msg = 'Cookie deleted for %s'

        logger.log(settings.LOGGING_LEVEL, msg, self.uuid)

    def fix(self, response=None):

        self.response = response or self.response

        try:

            if self.user.is_authenticated():

                if not self.is_set or not self.is_valid:

                    self.__set()

            else:

                if self.is_set:

                    self.__delete()

        except AttributeError:

            pass