View and some validation logic for database config

* Fixing some bugs in the manifest definition
* Database model and schema migration for tower settings
* Initial View and Serializer implementation using a strategy of merging
  model instances and named tuples

awx/api/generics.py

@@ -144,6 +144,7 @@ class APIView(views.APIView):
             'new_in_220': getattr(self, 'new_in_220', False),
             'new_in_230': getattr(self, 'new_in_230', False),
             'new_in_240': getattr(self, 'new_in_240', False),
+            'new_in_300': getattr(self, 'new_in_300', False),
         }
 
     def get_description(self, html=False):

awx/api/serializers.py

@@ -267,7 +267,7 @@ class BaseSerializer(serializers.ModelSerializer):
         return choices
 
     def get_url(self, obj):
-        if obj is None:
+        if obj is None or not hasattr(obj, 'get_absolute_url'):
             return ''
         elif isinstance(obj, User):
             return reverse('api:user_detail', args=(obj.pk,))
@@ -2105,7 +2105,12 @@ class ActivityStreamSerializer(BaseSerializer):
                                            first_name = obj.actor.first_name,
                                            last_name = obj.actor.last_name)
         return summary_fields
+    
+class TowerSettingsSerializer(BaseSerializer):
 
+    class Meta:
+        model = TowerSettings
+        fields = ('key', 'description', 'category', 'value', 'value_type', 'user')
 
 class AuthTokenSerializer(serializers.Serializer):
 

awx/api/urls.py

@@ -220,6 +220,9 @@ activity_stream_urls = patterns('awx.api.views',
     url(r'^(?P<pk>[0-9]+)/$',                           'activity_stream_detail'),
 )
 
+settings_urls = patterns('awx.api.views',
+                         url(r'^$',                                          'settings_list'))
+
 v1_urls = patterns('awx.api.views',
     url(r'^$',                      'api_v1_root_view'),
     url(r'^ping/$',                 'api_v1_ping_view'),
@@ -230,7 +233,8 @@ v1_urls = patterns('awx.api.views',
     url(r'^dashboard/$',            'dashboard_view'),
     url(r'^dashboard/graphs/jobs/$',     'dashboard_jobs_graph_view'),
     url(r'^dashboard/graphs/inventory/$',     'dashboard_inventory_graph_view'),
-    url(r'^schedules/',            include(schedule_urls)),
+    url(r'^settings/',              include(settings_urls)),
+    url(r'^schedules/',             include(schedule_urls)),
     url(r'^organizations/',         include(organization_urls)),
     url(r'^users/',                 include(user_urls)),
     url(r'^projects/',              include(project_urls)),

awx/api/views.py

@@ -12,6 +12,7 @@ import socket
 import sys
 import errno
 from base64 import b64encode
+from collections import namedtuple
 
 # Django
 from django.conf import settings
@@ -113,6 +114,7 @@ class ApiV1RootView(APIView):
         data['authtoken'] = reverse('api:auth_token_view')
         data['ping'] = reverse('api:api_v1_ping_view')
         data['config'] = reverse('api:api_v1_config_view')
+        data['settings'] = reverse('api:settings_list')
         data['me'] = reverse('api:user_me_list')
         data['dashboard'] = reverse('api:dashboard_view')
         data['organizations'] = reverse('api:organization_list')
@@ -2959,6 +2961,31 @@ class ActivityStreamDetail(RetrieveAPIView):
         # Okay, let it through.
         return super(type(self), self).get(request, *args, **kwargs)
 
+class SettingsList(ListCreateAPIView):
+
+    model = TowerSettings
+    serializer_class = TowerSettingsSerializer
+    new_in_300 = True
+    filter_backends = ()
+
+    def get_queryset(self):
+        SettingsTuple = namedtuple('Settings', ['key', 'description', 'category', 'value', 'value_type', 'user'])
+        # TODO: Filter by what the user can see
+        all_defined_settings = {s.key: SettingsTuple(s.key, s.description, s.category, s.value, s.value_type, s.user) for s in TowerSettings.objects.all()}
+        manifest_settings = settings.TOWER_SETTINGS_MANIFEST
+        settings_actual = []
+        for settings_key in manifest_settings:
+            if settings_key in all_defined_settings:
+                settings_actual.append(all_defined_settings[settings_key])
+            else:
+                m_entry = manifest_settings[settings_key]
+                settings_actual.append(SettingsTuple(settings_key,
+                                                     m_entry['description'],
+                                                     m_entry['category'],
+                                                     m_entry['default'],
+                                                     m_entry['type'],
+                                                     None))
+        return settings_actual
 
 # Create view functions for all of the class-based views to simplify inclusion
 # in URL patterns and reverse URL lookups, converting CamelCase names to