cas_provider/models.py

   1 from django.conf import settings
   2 from django.db import models
   3 from django.utils.translation import ugettext_lazy as _
   4 from random import Random
   5 import string
   6 from urllib.parse import urlencode, urlparse, parse_qs, ParseResult
   7
   8
   9 __all__ = ['ServiceTicket', 'LoginTicket', 'ProxyGrantingTicket', 'ProxyTicket', 'ProxyGrantingTicketIOU']
  10
  11 class BaseTicket(models.Model):
  12     ticket = models.CharField(_('ticket'), max_length=32)
  13     created = models.DateTimeField(_('created'), auto_now=True)
  14
  15     class Meta:
  16         abstract = True
  17
  18     def __init__(self, *args, **kwargs):
  19         if 'ticket' not in kwargs:
  20             kwargs['ticket'] = self._generate_ticket()
  21         super(BaseTicket, self).__init__(*args, **kwargs)
  22
  23     def __unicode__(self):
  24         return self.ticket
  25
  26     def _generate_ticket(self, length=ticket.max_length, chars=string.ascii_letters + string.digits):
  27         """ Generates a random string of the requested length. Used for creation of tickets. """
  28         return "%s-%s" % (self.prefix, ''.join(Random().sample(chars, length - (len(self.prefix) + 1))))
  29
  30
  31 class ServiceTicket(BaseTicket):
  32     user = models.ForeignKey(settings.AUTH_USER_MODEL, verbose_name=_('user'), on_delete=models.CASCADE)
  33     service = models.URLField(_('service'), max_length=2048)
  34
  35     prefix = 'ST'
  36
  37     class Meta:
  38         verbose_name = _('Service Ticket')
  39         verbose_name_plural = _('Service Tickets')
  40
  41     def get_redirect_url(self):
  42         parsed = urlparse(self.service)
  43         query = parse_qs(parsed.query)
  44         query['ticket'] = [self.ticket]
  45         query = [((k, v) if len(v) > 1 else (k, v[0])) for k, v in query.items()]
  46         parsed = ParseResult(parsed.scheme, parsed.netloc,
  47                                       parsed.path, parsed.params,
  48                                       urlencode(query), parsed.fragment)
  49         return parsed.geturl()
  50
  51
  52 class LoginTicket(BaseTicket):
  53     prefix = 'LT'
  54
  55     class Meta:
  56         verbose_name = _('Login Ticket')
  57         verbose_name_plural = _('Login Tickets')
  58
  59
  60 class ProxyGrantingTicket(BaseTicket):
  61     user = models.ForeignKey(settings.AUTH_USER_MODEL, verbose_name=_('user'), on_delete=models.CASCADE)
  62     service = models.URLField(_('service'), null=True)
  63     pgt = models.ForeignKey('self', null=True, on_delete=models.CASCADE)
  64     pgtiou = models.CharField(max_length=256, verbose_name=_('PGTiou'))
  65     prefix = 'PGT'
  66
  67     def __init__(self, *args, **kwargs):
  68         if 'pgtiou' not in kwargs:
  69             kwargs['pgtiou'] = "PGTIOU-%s" % (''.join(Random().sample(string.ascii_letters + string.digits, 50)))
  70         super(ProxyGrantingTicket, self).__init__(*args, **kwargs)
  71
  72     class Meta:
  73         verbose_name = _('Proxy Granting Ticket')
  74         verbose_name_plural = _('Proxy Granting Tickets')
  75
  76
  77 class ProxyTicket(ServiceTicket):
  78     proxyGrantingTicket = models.ForeignKey(ProxyGrantingTicket, verbose_name=_('Proxy Granting Ticket'), on_delete=models.CASCADE)
  79
  80     prefix = 'PT'
  81
  82     class Meta:
  83         verbose_name = _('Proxy Ticket')
  84         verbose_name_plural = _('Proxy Tickets')
  85
  86
  87 class ProxyGrantingTicketIOU(BaseTicket):
  88     proxyGrantingTicket = models.ForeignKey(ProxyGrantingTicket, verbose_name=_('Proxy Granting Ticket'), on_delete=models.CASCADE)
  89
  90     prefix = 'PGTIOU'
  91
  92     class Meta:
  93         verbose_name = _('Proxy Granting Ticket IOU')
  94         verbose_name_plural = _('Proxy Granting Tickets IOU')
  95