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# (c) 2005 Ian Bicking and contributors; written for Paste (http://pythonpaste.org)
# Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
"""
Creates a session object.
In your application, use::
environ['paste.flup_session_service'].session
This will return a dictionary. The contents of this dictionary will
be saved to disk when the request is completed. The session will be
created when you first fetch the session dictionary, and a cookie will
be sent in that case. There's current no way to use sessions without
cookies, and there's no way to delete a session except to clear its
data.
"""
from paste import httpexceptions
from paste import wsgilib
import flup.middleware.session
flup_session = flup.middleware.session
# This is a dictionary of existing stores, keyed by a tuple of
# store type and parameters
store_cache = {}
class NoDefault(object):
pass
class SessionMiddleware(object):
session_classes = {
'memory': (flup_session.MemorySessionStore,
[('session_timeout', 'timeout', int, 60)]),
'disk': (flup_session.DiskSessionStore,
[('session_timeout', 'timeout', int, 60),
('session_dir', 'storeDir', str, '/tmp/sessions')]),
'shelve': (flup_session.ShelveSessionStore,
[('session_timeout', 'timeout', int, 60),
('session_file', 'storeFile', str,
'/tmp/session.shelve')]),
}
def __init__(self, app,
global_conf=None,
session_type=NoDefault,
cookie_name=NoDefault,
**store_config
):
self.application = app
if session_type is NoDefault:
session_type = global_conf.get('session_type', 'disk')
self.session_type = session_type
try:
self.store_class, self.store_args = self.session_classes[self.session_type]
except KeyError:
raise KeyError(
"The session_type %s is unknown (I know about %s)"
% (self.session_type,
', '.join(self.session_classes.keys())))
kw = {}
for config_name, kw_name, coercer, default in self.store_args:
value = coercer(store_config.get(config_name, default))
kw[kw_name] = value
self.store = self.store_class(**kw)
if cookie_name is NoDefault:
cookie_name = global_conf.get('session_cookie', '_SID_')
self.cookie_name = cookie_name
def __call__(self, environ, start_response):
service = flup_session.SessionService(
self.store, environ, cookieName=self.cookie_name,
fieldName=self.cookie_name)
environ['paste.flup_session_service'] = service
def cookie_start_response(status, headers, exc_info=None):
service.addCookie(headers)
return start_response(status, headers, exc_info)
try:
app_iter = self.application(environ, cookie_start_response)
except httpexceptions.HTTPException, e:
headers = (e.headers or {}).items()
service.addCookie(headers)
e.headers = dict(headers)
service.close()
raise
except:
service.close()
raise
return wsgilib.add_close(app_iter, service.close)
def make_session_middleware(app, global_conf,
session_type=NoDefault,
cookie_name=NoDefault,
**store_config):
"""
Wraps the application in a session-managing middleware.
The session service can then be found in
``environ['paste.flup_session_service']``
"""
return SessionMiddleware(
app, global_conf=global_conf,
session_type=session_type, cookie_name=cookie_name,
**store_config)
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