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# Copyright 2005 Gentoo Foundation
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# Distributed under the terms of the GNU General Public License v2
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#
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"""Simple session handling objects"""
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__revision__ = "$Id$"
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__authors__ = ["Scott Hadfield <hadfield@gentoo.org>",
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"Ian Leitch <port001@gentoo.org>"]
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__modulename__ = "sessionutils"
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import sha
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import hmac
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import cPickle
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import threading
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from time import time
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from random import Random
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from types import BooleanType
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import os
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from glsr.setup import config
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class Session(object):
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def __init__(self, session_store = None):
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self.__id = ''
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self.attrs = {}
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self.__persistent = False
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self.expires = ''
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self.__removed = False
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self.__modified = False
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self.__end_init = False
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self._session_store = session_store
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def __setattr__(self, name, value):
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if hasattr(self, '_Session__end_init'):
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if self.__end_init:
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if not self.__modified:
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self.__dict__['_Session__modified'] = True
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object.__setattr__(self, name, value)
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def _end_init(self):
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self.__end_init = True
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def _set_id(self, id):
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self.__id = id
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def get_id(self):
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return self.__id
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def is_modified(self):
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return self.__modified
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def set_persistent(self, flag):
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if type(flag) == BooleanType:
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self.__persistent = flag
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def is_persistent(self):
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return self.__persistent
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def set_removed(self):
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self.__removed = True
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self._session_store.remove_session(self.__id)
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def is_removed(self):
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return self.__removed
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class SessionStorage:
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def __init__(self, type):
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# type is ['ram', 'flush2disk']
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# TODO: We need a cleanup method called every n houres
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self.__type = str(type).lower()
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self.__lock = threading.Lock()
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self.__store = {}
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if self.__type == 'flush2disk':
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if not os.path.exists(config.StoreDir):
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raise "StoreDir '%s' does not exist" % config.StoreDir
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if not os.path.isdir(config.StoreDir):
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raise "StoreDir '%s' is not a directory" % config.StoreDir
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def load_store(self):
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if self.__type == 'flush2disk':
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for file in os.listdir(config.StoreDir):
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if file.endswith('.session'):
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try:
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session_dict = cPickle.load(
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open(os.path.join(config.StoreDir, file), 'r'))
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except IOError, e:
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raise "Failed to load session file" + \
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"'%s': %s" % (file, e)
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self.__store[session_dict.keys()[0]] = (
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session_dict[session_dict.keys()[0]])
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def save_store(self):
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if self.__type == 'flush2disk':
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for session in self.__store.iterkeys():
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try:
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session_path = os.path.join(config.StoreDir,
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"%s.session" % session)
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cPickle.dump({session: self.__store[session]},
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open(session_path, 'w'))
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except IOError, e:
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raise "Failed to save session file " + \
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"'%s.session': %s" % (session, e)
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def has_expired(self, sessionId):
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if not self.has_session(sessionId):
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return True
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self.__lock.acquire()
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if (self.__store[sessionId]['expires'] <= int(time())
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and self.__store[sessionId]['persistent'] == False):
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self.__lock.release()
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return True
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self.__lock.release()
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return False
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def has_session(self, sessionId):
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self.__lock.acquire()
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if self.__store.has_key(sessionId):
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self.__lock.release()
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return True
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self.__lock.release()
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return False
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def remove_session(self, sessionId):
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if self.has_session(sessionId):
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self.__lock.acquire()
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self.__store.pop(sessionId)
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self.__lock.release()
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def store_session(self, sessionId=None, expires=None):
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self.__lock.acquire()
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self.__store[sessionId] = {'expires': 0, 'attrs': {},
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'persistent': False}
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self.__store[sessionId]['expires'] = int(time() + (expires * 60))
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self.__lock.release()
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def set_persistent(self, sessionId, flag):
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if self.has_session(sessionId):
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self.__lock.acquire()
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self.__store[sessionId]['persistent'] = flag
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self.__lock.release()
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def load_session(self, sessionId):
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self.__lock.acquire()
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if self.__store.has_key(sessionId):
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self.__lock.release()
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if self.has_expired(sessionId):
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self.__lock.acquire()
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self.__store.pop(sessionId)
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self.__lock.release()
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return None
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self.__lock.acquire()
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x = self.__store[sessionId]
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self.__lock.release()
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return x
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else:
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self.__lock.release()
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return None
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def update_session(self, sessionId, **args):
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self.__lock.acquire()
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if sessionId in self.__store.keys():
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for key in args.keys():
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if key in self.__store[sessionId].keys():
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self.__store[sessionId][key] = args[key]
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elif key in self.__store[sessionId]['attrs'].keys():
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self.__store[sessionId]['attrs'][key] = args[key]
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else:
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self.__store[sessionId]['attrs'][key] = args[key]
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self.__lock.release()
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def gen_hash(sid):
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return hmac.new(config.SecretKey, sid, sha).hexdigest()[:10]
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def _gen_sid(client_addr, host):
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ran = Random()
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return sha.new(str(time() * ran.randint(0, 10000000000000000000000000)) + \
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str(client_addr) + str(host)).hexdigest()
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def gen_session_id(client_addr, host):
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# TODO: Just using the client IP addr isn't great.
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sid = _gen_sid(client_addr, host)
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return sid + gen_hash(sid)
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