Adding Django sites app

Activate Django sites app and create a migration which adds the
LIGO.ORG domain name of the GraceDB instance as a Site. This will
be used to build absolute URIs without needed a request object.

config/settings/base.py

@@ -279,13 +279,16 @@ MIDDLEWARE = [
 # Path to root URLconf
 ROOT_URLCONF = '{module}.urls'.format(module=os.path.basename(CONFIG_ROOT))
 
+# Database ID of the current site (for sites framework)
+SITE_ID=1
+
 # List of string designating all applications which are enabled.
 INSTALLED_APPS = [
     'django.contrib.auth',
     'django.contrib.admin',
     'django.contrib.contenttypes',
     'django.contrib.sessions',
-#    'django.contrib.sites',
+    'django.contrib.sites',
     'django.contrib.staticfiles',
     'django.contrib.messages',
     'maintenance_mode',
@@ -348,10 +351,12 @@ STATICFILES_DIRS = [
     BOWER_DIR,
 ]
 
-# Added in order to perform data migrations on the auth and guardian apps
+# Added in order to perform data migrations on Django apps
+# and other third-party apps
 MIGRATION_MODULES = {
     'auth': 'migrations.auth',
     'guardian': 'migrations.guardian',
+    'sites': 'migrations.sites',
 }
 
 # Forces test database to be created with syncdb rather than via

gracedb/migrations/sites/0001_initial.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.5 on 2018-06-04 16:04
+from __future__ import unicode_literals
+
+import django.contrib.sites.models
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Site',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('domain', models.CharField(max_length=100, unique=True, validators=[django.contrib.sites.models._simple_domain_name_validator], verbose_name='domain name')),
+                ('name', models.CharField(max_length=50, verbose_name='display name')),
+            ],
+            options={
+                'ordering': ('domain',),
+                'db_table': 'django_site',
+                'verbose_name': 'site',
+                'verbose_name_plural': 'sites',
+            },
+            managers=[
+                ('objects', django.contrib.sites.models.SiteManager()),
+            ],
+        ),
+    ]

gracedb/migrations/sites/0002_update_site.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.5 on 2018-06-04 16:05
+from __future__ import unicode_literals
+
+from django.db import migrations
+from django.conf import settings
+import socket
+
+SITES = {
+    'old': {
+        'domain': 'example.com',
+        'name': 'example.com',
+    },
+    'new': {
+        'domain': socket.gethostname() + '.ligo.org',
+        'name': 'ligo.org',
+    },
+}
+
+def update_site(apps, schema_editor):
+    Site = apps.get_model('sites', 'Site')
+
+    # Get current site matching SITE_ID, should be example.com at this point
+    site1 = Site.objects.get(id=settings.SITE_ID)
+
+    # Update with new site name and domain
+    site1.name = SITES['new']['name']
+    site1.domain = SITES['new']['domain']
+    site1.save()
+
+
+def revert_site(apps, schema_editor):
+    Site = apps.get_model('sites', 'Site')
+
+    # Get current site matching SITE_ID should be ligo.org
+    site1 = Site.objects.get(id=settings.SITE_ID)
+
+    # Revert to original site
+    site1.name = SITES['old']['name']
+    site1.domain = SITES['old']['domain']
+    site1.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('sites', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.RunPython(update_site, revert_site),
+    ]