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#!/usr/bin/env python
import logging
import memcache
from saml2 import time_util
from saml2.cache import TooOld, CacheError
# The assumption is that any subject may consist of data
# gathered from several different sources, all with their own
# timeout time.
logger = logging.getLogger(__name__)
def _key(prefix, name):
return "%s_%s" % (prefix, name)
class Cache(object):
def __init__(self, servers, debug=0):
self._cache = memcache.Client(servers, debug)
def delete(self, subject_id):
entities = self.entities(subject_id)
if entities:
for entity_id in entities:
if not self._cache.delete(_key(subject_id, entity_id)):
raise CacheError("Delete failed")
if not self._cache.delete(subject_id):
raise CacheError("Delete failed")
subjects = self._cache.get("subjects")
if subjects and subject_id in subjects:
subjects.remove(subject_id)
if not self._cache.set("subjects", subjects):
raise CacheError("Set operation failed")
def get_identity(self, subject_id, entities=None):
""" 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:
entities = self.entities(subject_id)
if not entities:
return {}, []
res = {}
oldees = []
for (entity_id, item) in self._cache.get_multi(entities,
subject_id+'_').items():
try:
info = self.get_info(item)
except TooOld:
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_info(self, item, check_not_on_or_after=True):
""" Get session information about a subject gotten from a
specified IdP/AA.
:param item: Information stored
:return: The session information as a dictionary
"""
try:
(timestamp, info) = item
except ValueError:
raise TooOld()
if check_not_on_or_after and not time_util.not_on_or_after(timestamp):
raise TooOld()
return info or None
def get(self, subject_id, entity_id, check_not_on_or_after=True):
res = self._cache.get(_key(subject_id, entity_id))
if not res:
return {}
else:
return self.get_info(res)
def set(self, subject_id, entity_id, info, timestamp=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 timestamp: A time after which the assertion is not valid.
"""
entities = self._cache.get(subject_id)
if not entities:
entities = []
subjects = self._cache.get("subjects")
if not subjects:
subjects = []
if subject_id not in subjects:
subjects.append(subject_id)
if not self._cache.set("subjects", subjects):
raise CacheError("set failed")
if entity_id not in entities:
entities.append(entity_id)
if not self._cache.set(subject_id, entities):
raise CacheError("set failed")
# Should use memcache's expire
if not self._cache.set(_key(subject_id, entity_id), (timestamp, info)):
raise CacheError("set failed")
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:
"""
if not self._cache.set(_key(subject_id, entity_id), {}, 0):
raise CacheError("reset failed")
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
"""
res = self._cache.get(subject_id)
if not res:
raise KeyError("No such subject")
else:
return res
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._cache.get(_key(subject_id, entity_id))
except ValueError:
return False
except TypeError:
return False
# if not info:
# return False
try:
return time_util.not_on_or_after(timestamp)
except TooOld:
return False
def subjects(self):
""" Return identifiers for all the subjects that are in the cache.
:return: list of subject identifiers
"""
return self._cache.get("subjects")
def update(self, subject_id, entity_id, ava):
res = self._cache.get(_key(subject_id, entity_id))
if res is None:
raise KeyError("No such subject")
else:
info = self.get_info(res)
if info:
info.update(ava)
self.set(subject_id, entity_id, info, res[0])
def valid_to(self, subject_id, entity_id, newtime):
try:
(timestamp, info) = self._cache.get(_key(subject_id, entity_id))
except ValueError:
return False
except TypeError:
info = {}
if not self._cache.set(_key(subject_id, entity_id), (newtime, info)):
raise CacheError("valid_to failed")
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