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# -*- coding: utf-8 -*-
"""
flask.session
~~~~~~~~~~~~~
Implements cookie based sessions based on Werkzeug's secure cookie
system.
:copyright: (c) 2010 by Armin Ronacher.
:license: BSD, see LICENSE for more details.
"""
from werkzeug.contrib.securecookie import SecureCookie
class Session(SecureCookie):
"""Expands the session with support for switching between permanent
and non-permanent sessions.
"""
def _get_permanent(self):
return self.get('_permanent', False)
def _set_permanent(self, value):
self['_permanent'] = bool(value)
permanent = property(_get_permanent, _set_permanent)
del _get_permanent, _set_permanent
class _NullSession(Session):
"""Class used to generate nicer error messages if sessions are not
available. Will still allow read-only access to the empty session
but fail on setting.
"""
def _fail(self, *args, **kwargs):
raise RuntimeError('the session is unavailable because no secret '
'key was set. Set the secret_key on the '
'application to something unique and secret')
__setitem__ = __delitem__ = clear = pop = popitem = \
update = setdefault = _fail
del _fail
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