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#!/usr/bin/env python
import shelve
from saml2 import time_util
# The assumption is that any subject may consist of data
# gathered from several different sources, all with their own
# timeout time.
class ToOld(Exception):
pass
class CacheError(Exception):
pass
class Cache(object):
def __init__(self, filename=None):
if filename:
self._db = shelve.open(filename, writeback=True)
self._sync = True
else:
self._db = {}
self._sync = False
def delete(self, subject_id):
del self._db[subject_id]
if self._sync:
self._db.sync()
def get_identity(self, subject_id, entities=None,
check_not_on_or_after=True):
""" Get all the identity information that has been received and
are still valid about the subject.
:param subject_id: The identifier of the subject
:param entities: The identifiers of the entities whoes assertions are
interesting. If the list is empty all entities are interesting.
:return: A 2-tuple consisting of the identity information (a
dictionary of attributes and values) and the list of entities
whoes information has timed out.
"""
if not entities:
try:
entities = self._db[subject_id].keys()
except KeyError:
return {}, []
res = {}
oldees = []
for entity_id in entities:
try:
info = self.get(subject_id, entity_id, check_not_on_or_after)
except ToOld:
oldees.append(entity_id)
continue
if not info:
oldees.append(entity_id)
continue
for key, vals in info["ava"].items():
try:
tmp = set(res[key]).union(set(vals))
res[key] = list(tmp)
except KeyError:
res[key] = vals
return res, oldees
def get(self, subject_id, entity_id, check_not_on_or_after=True):
""" Get session information about a subject gotten from a
specified IdP/AA.
:param subject_id: The identifier of the subject
:param entity_id: The identifier of the entity_id
:param check_not_on_or_after: if True it will check if this
subject is still valid or if it is too old. Otherwise it
will not check this. True by default.
:return: The session information
"""
(timestamp, info) = self._db[subject_id][entity_id]
if check_not_on_or_after and time_util.after(timestamp):
raise ToOld("past %s" % timestamp)
return info or None
def set(self, subject_id, entity_id, info, not_on_or_after=0):
""" Stores session information in the cache. Assumes that the subject_id
is unique within the context of the Service Provider.
:param subject_id: The subject identifier
:param entity_id: The identifier of the entity_id/receiver of an
assertion
:param info: The session info, the assertion is part of this
:param not_on_or_after: A time after which the assertion is not valid.
"""
if subject_id not in self._db:
self._db[subject_id] = {}
self._db[subject_id][entity_id] = (not_on_or_after, info)
if self._sync:
self._db.sync()
def reset(self, subject_id, entity_id):
""" Scrap the assertions received from a IdP or an AA about a special
subject.
:param subject_id: The subjects identifier
:param entity_id: The identifier of the entity_id of the assertion
:return:
"""
self.set(subject_id, entity_id, {}, 0)
def entities(self, subject_id):
""" Returns all the entities of assertions for a subject, disregarding
whether the assertion still is valid or not.
:param subject_id: The identifier of the subject
:return: A possibly empty list of entity identifiers
"""
return self._db[subject_id].keys()
def receivers(self, subject_id):
""" Another name for entities() just to make it more logic in the IdP
scenario """
return self.entities(subject_id)
def active(self, subject_id, entity_id):
""" Returns the status of assertions from a specific entity_id.
:param subject_id: The ID of the subject
:param entity_id: The entity ID of the entity_id of the assertion
:return: True or False depending on if the assertion is still
valid or not.
"""
try:
(timestamp, info) = self._db[subject_id][entity_id]
except KeyError:
return False
if not info:
return False
else:
return time_util.not_on_or_after(timestamp)
def subjects(self):
""" Return identifiers for all the subjects that are in the cache.
:return: list of subject identifiers
"""
return self._db.keys()
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