Added migration to add TIGER robot user.

ligoauth/migrations/0003_auto_20150819_1201.py

+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+users = [
+        {
+            'username' : 'TIGER',
+            'first_name' : '',
+            'last_name' : 'TIGER',
+            'email' : 'salvatore.vitale@ligo.org',
+            'dns' : [
+                "/DC=org/DC=ligo/O=LIGO/OU=Services/CN=TIGER/ldas-pcdev1.ligo.caltech.edu",
+            ]
+        },
+]
+
+def add_robot_user(apps, schema_editor):
+    X509Cert = apps.get_model("ligoauth", "X509Cert")
+    LocalUser = apps.get_model("ligoauth", "LocalUser")
+
+    for entry in users:
+        user, created = LocalUser.objects.get_or_create(username=entry['username'])
+        if created:
+            user.first_name = entry['first_name']
+            user.last_name = entry['last_name']
+            user.email = entry['email']
+            user.is_active = True
+            user.is_staff = False
+            user.is_superuser = False
+            user.save()
+        current_dns = set([cert.subject for cert in user.x509cert_set.all()])
+        new_dns = set(entry['dns'])
+
+        missing_dns = new_dns - current_dns
+        redundant_dns = current_dns - new_dns
+
+        for dn in missing_dns:
+            cert, created = X509Cert.objects.get_or_create(subject=dn)
+            if created:
+                cert.save()
+            cert.users.add(user)
+
+        for dn in redundant_dns:
+            cert = X509Cert.objects.get(subject=dn)
+            cert.users.remove(user)
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ligoauth', '0002_auto_20150708_1134'),
+    ]
+
+    operations = [
+        migrations.RunPython(add_robot_user),
+    ]