web/views/sessions.py
author Laure Bourgois <Laure.Bourgois@logilab.fr>
Mon, 23 Feb 2009 16:25:59 +0100
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removing foaf_usable
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"""web session component: by dfault the session is actually the db connection
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object :/
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:organization: Logilab
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:copyright: 2001-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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"""
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__docformat__ = "restructuredtext en"
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from cubicweb.web import ExplicitLogin, InvalidSession
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from cubicweb.web.application import AbstractSessionManager
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class InMemoryRepositorySessionManager(AbstractSessionManager):
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    """manage session data associated to a session identifier"""
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    def __init__(self):
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        AbstractSessionManager.__init__(self)
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        # XXX require a RepositoryAuthenticationManager which violates
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        #     authenticate interface by returning a session instead of a user
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        #assert isinstance(self.authmanager, RepositoryAuthenticationManager)
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        self._sessions = {}
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    def current_sessions(self):
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        return self._sessions.values()
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    def get_session(self, req, sessionid):
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        """return existing session for the given session identifier"""
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        if not sessionid in self._sessions:
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            raise InvalidSession()
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        session = self._sessions[sessionid]
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        if self.has_expired(session):
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            self.close_session(session)
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            raise InvalidSession()
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        # give an opportunity to auth manager to hijack the session
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        # (necessary with the RepositoryAuthenticationManager in case
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        #  the connection to the repository has expired)
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        try:
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            session = self.authmanager.validate_session(req, session)
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            # necessary in case session has been hijacked
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            self._sessions[session.sessionid] = session
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        except InvalidSession:
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            # invalid session
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            del self._sessions[sessionid]
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            raise
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        return session
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    def open_session(self, req):
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        """open and return a new session for the given request
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        :raise ExplicitLogin: if authentication is required
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        """
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        session = self.authmanager.authenticate(req)
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        self._sessions[session.sessionid] = session
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        return session
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    def close_session(self, session):
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        """close session on logout or on invalid session detected (expired out,
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        corrupted...)
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        """
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        self.info('closing http session %s' % session)
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        del self._sessions[session.sessionid]
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        try:
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            session.close()
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        except:
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            # already closed, may occurs if the repository session expired but
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            # not the web session
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            pass
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