Viewing file:  logout_guard2.py (2.97 KB) -rw-r--r--
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"""
How to access the session from guard's logout function,
with an example of remembering values within the session.
"""
# A resource for our site
#
import random
from zope.interface import implements, Interface
from nevow import guard
from nevow import rend
from nevow import loaders
from nevow import tags as T
from nevow import url
from nevow.inevow import ISession
class IValueHistory(Interface):
pass
class ISessionValue(Interface):
pass
class MyRootResource(rend.Page):
"""Some resource."""
addSlash = True
def render_randomNumber(self, ctx, data):
session = ISession(ctx)
number = random.randrange(0, 100)
session.setComponent(ISessionValue, number)
history = session.getComponent(IValueHistory)
if history is None:
history = []
history.append(number)
session.setComponent(IValueHistory, history)
return str(number)
def render_valueHistory(self, ctx, data):
session = ISession(ctx)
history = session.getComponent(IValueHistory, default=[])
return repr(history[:-1])
docFactory = loaders.stan(
T.html[
T.body[
T.p['Your random number is: ', render_randomNumber],
T.p['Previous random numbers were: ', render_valueHistory],
T.div[T.a(href=url.here)['Click here to get a new number']],
T.div[T.a(href=url.here.child(guard.LOGOUT_AVATAR))['Click here to log out']],
]
]
)
# Cred-specific implementation
#
from twisted.cred.portal import IRealm
from nevow.inevow import IResource
class Mind:
def __init__(self, request, credentials):
self.request = request
self.credentials = credentials
class MyRealm:
implements(IRealm)
def requestAvatar(self, avatar_id, mind, *interfaces):
if IResource in interfaces:
return (
IResource,
MyRootResource(),
self.createLogout(avatar_id, mind)
)
raise NotImplementedError
def createLogout(self, avatar_id, mind):
def logout():
# This will be a nevow.guard.GuardSession instance
session = mind.request.getSession()
values = session.getComponent(IValueHistory)
session.unsetComponent(IValueHistory)
print 'Logging avatar', avatar_id, 'out of session', session
print 'Random numbers generated were', values
return logout
# Code for examples.tac
#
from twisted.cred.portal import Portal
from twisted.cred.checkers import AllowAnonymousAccess
from twisted.cred.credentials import IAnonymous
from nevow.guard import SessionWrapper
def createResource():
portal = Portal(MyRealm())
portal.registerChecker(AllowAnonymousAccess(), IAnonymous)
# Here is the vital part: specifying a mindFactory for guard to use
return SessionWrapper(portal, mindFactory=Mind)
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