From 2cf88a572643b5e54858f5d3b00d188b8e7230ed Mon Sep 17 00:00:00 2001
From: Radek Czajka <rczajka@rczajka.pl>
Date: Sun, 21 Sep 2014 00:11:53 +0200
Subject: [PATCH 1/1] Can't have ForeignKey from PGT to ST, if ST is deleted
 immediately.

---
 .../migrations/0002_auto_20140920_1644.py     | 38 +++++++++++++++++++
 cas_provider/models.py                        |  4 +-
 cas_provider/views.py                         | 22 ++++-------
 3 files changed, 49 insertions(+), 15 deletions(-)
 create mode 100644 cas_provider/migrations/0002_auto_20140920_1644.py

diff --git a/cas_provider/migrations/0002_auto_20140920_1644.py b/cas_provider/migrations/0002_auto_20140920_1644.py
new file mode 100644
index 0000000..5948a66
--- /dev/null
+++ b/cas_provider/migrations/0002_auto_20140920_1644.py
@@ -0,0 +1,38 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+from django.conf import settings
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('cas_provider', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='proxygrantingticket',
+            name='serviceTicket',
+        ),
+        migrations.AddField(
+            model_name='proxygrantingticket',
+            name='pgt',
+            field=models.ForeignKey(to='cas_provider.ProxyGrantingTicket', null=True),
+            preserve_default=True,
+        ),
+        migrations.AddField(
+            model_name='proxygrantingticket',
+            name='service',
+            field=models.URLField(null=True, verbose_name='service'),
+            preserve_default=True,
+        ),
+        migrations.AddField(
+            model_name='proxygrantingticket',
+            name='user',
+            field=models.ForeignKey(default=0, verbose_name='user', to=settings.AUTH_USER_MODEL),
+            preserve_default=False,
+        ),
+    ]
diff --git a/cas_provider/models.py b/cas_provider/models.py
index 43463d5..12fed4c 100644
--- a/cas_provider/models.py
+++ b/cas_provider/models.py
@@ -65,7 +65,9 @@ class LoginTicket(BaseTicket):
 
 
 class ProxyGrantingTicket(BaseTicket):
-    serviceTicket = models.ForeignKey(ServiceTicket, null=True)
+    user = models.ForeignKey(settings.AUTH_USER_MODEL, verbose_name=_('user'))
+    service = models.URLField(_('service'), null=True)
+    pgt = models.ForeignKey('self', null=True)
     pgtiou = models.CharField(max_length=256, verbose_name=_('PGTiou'))
     prefix = 'PGT'
 
diff --git a/cas_provider/views.py b/cas_provider/views.py
index 0f53d38..126e3d1 100644
--- a/cas_provider/views.py
+++ b/cas_provider/views.py
@@ -239,7 +239,7 @@ def proxy(request):
         return _cas2_error_response(INVALID_TICKET)
 
     pt = ProxyTicket.objects.create(proxyGrantingTicket=proxyGrantingTicket,
-        user=proxyGrantingTicket.serviceTicket.user,
+        user=proxyGrantingTicket.user,
         service=targetService)
     return _cas2_proxy_success(pt.ticket)
 
@@ -276,13 +276,9 @@ def ticket_validate(service, ticket_string, pgtUrl):
     if hasattr(ticket, 'proxyticket'):
         pgt = ticket.proxyticket.proxyGrantingTicket
         # I am issued by this proxy granting ticket
-        if hasattr(pgt.serviceTicket, 'proxyticket'):
-            while pgt:
-                if hasattr(pgt.serviceTicket, 'proxyticket'):
-                    proxies += (pgt.serviceTicket.service,)
-                    pgt = pgt.serviceTicket.proxyticket.proxyGrantingTicket
-                else:
-                    pgt = None
+        while pgt.pgt is not None:
+            proxies += (pgt.service,)
+            pgt = pgt.pgt
 
     user = ticket.user
     ticket.delete()
@@ -315,12 +311,10 @@ def generate_proxy_granting_ticket(pgt_url, ticket):
     uri = list(urlsplit(pgt_url))
 
     pgt = ProxyGrantingTicket()
-    pgt.serviceTicket = ticket
-    pgt.targetService = pgt_url
-
-    if hasattr(ticket, 'proxyGrantingTicket'):
-        # here we got a proxy ticket! tata!
-        pgt.pgt = ticket.proxyGrantingTicket
+    pgt.user = ticket.user
+    pgt.service = ticket.service
+    # Remember if it's a chained PGT.
+    pgt.pgt = getattr(ticket, 'proxyGrantingTicket', None)
 
     params = {'pgtId': pgt.ticket, 'pgtIou': pgt.pgtiou}
 
-- 
2.20.1