from importlib import import_module
from cas import CASError
from django.conf import settings
from django.db import models
from django.http import HttpRequest
from .utils import get_cas_client, get_user_from_session
SessionStore = import_module(settings.SESSION_ENGINE).SessionStore
SESSION_KEY_MAXLENGTH = 736
[docs]class ProxyError(ValueError):
pass
[docs]class ProxyGrantingTicket(models.Model):
class Meta:
unique_together = ('session_key', 'user')
session_key = models.CharField(
max_length=SESSION_KEY_MAXLENGTH,
blank=True, null=True)
user = models.ForeignKey(
settings.AUTH_USER_MODEL,
related_name="+",
null=True,
blank=True,
on_delete=models.CASCADE
)
pgtiou = models.CharField(max_length=255, null=True, blank=True)
pgt = models.CharField(max_length=255, null=True, blank=True)
date = models.DateTimeField(auto_now_add=True)
[docs] @classmethod
def clean_deleted_sessions(cls) -> None:
for pgt in cls.objects.all():
session = SessionStore(session_key=pgt.session_key)
user = get_user_from_session(session)
if not user.is_authenticated:
pgt.delete()
[docs] @classmethod
def retrieve_pt(cls, request: HttpRequest, service: str) -> str:
"""`request` should be the current HttpRequest object
`service` a string representing the service for witch we want to
retrieve a ticket.
The function return a Proxy Ticket or raise `ProxyError`
"""
try:
pgt = cls.objects.get(
user=request.user,
session_key=request.session.session_key[:SESSION_KEY_MAXLENGTH]
).pgt
except cls.DoesNotExist:
raise ProxyError(
"INVALID_TICKET",
"No proxy ticket found for this HttpRequest object"
)
else:
client = get_cas_client(service_url=service, request=request)
try:
return client.get_proxy_ticket(pgt)
# change CASError to ProxyError nicely
except CASError as error:
raise ProxyError(*error.args)
# just embed other errors
except Exception as e:
raise ProxyError(e)
[docs]class SessionTicket(models.Model):
session_key = models.CharField(max_length=SESSION_KEY_MAXLENGTH)
ticket = models.CharField(max_length=1024)
[docs] @classmethod
def clean_deleted_sessions(cls) -> None:
for st in cls.objects.all():
session = SessionStore(session_key=st.session_key)
user = get_user_from_session(session)
if not user.is_authenticated:
st.delete()