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# An eduPersonTargetedID comprises
# the entity name of the identity provider, the entity name of the service
# provider, and a opaque string value.
# These strings are separated by "!" symbols. This form is advocated by
# Internet2 and may overtake the other form in due course.
import hashlib
import shelve
import logging
logger = logging.getLogger(__name__)
class Eptid(object):
def __init__(self, secret):
self._db = {}
self.secret = secret
def make(self, idp, sp, args):
md5 = hashlib.md5()
for arg in args:
md5.update(arg.encode("utf-8"))
md5.update(sp)
md5.update(self.secret)
md5.digest()
hashval = md5.hexdigest()
return "!".join([idp, sp, hashval])
def __getitem__(self, key):
return self._db[key]
def __setitem__(self, key, value):
self._db[key] = value
def get(self, idp, sp, *args):
# key is a combination of sp_entity_id and object id
key = ("__".join([sp, args[0]])).encode("utf-8")
try:
return self[key]
except KeyError:
val = self.make(idp, sp, args)
self[key] = val
return val
class EptidShelve(Eptid):
def __init__(self, secret, filename):
Eptid.__init__(self, secret)
self._db = shelve.open(filename, writeback=True)
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