Addition of content reporting

New app called "moderation" which handles the reporting, and in the future, management of incorrect records in the database.

app/moderation/views.py

@@ -0,0 +1,57 @@
+import json
+from django.http import HttpResponseBadRequest
+from django.views.generic import View
+from django.contrib.contenttypes.models import ContentType
+from braces.views import AjaxResponseMixin, JSONResponseMixin
+from moderation.models import FlaggedObject
+
+
+class FlagObjectView(JSONResponseMixin, AjaxResponseMixin, View):
+    """
+    Ajax capable view to flag a object for moderation
+    """
+
+    def render_invalid_response(self, reason='invalid-request'):
+        return HttpResponseBadRequest(content=json.dumps({
+            'result': 'invalid-request',
+            'reason': reason,
+        }), content_type=self.get_content_type())
+
+    def post(self, request, *args, **kwargs):
+        pass
+
+    def post_ajax(self, request, *args, **kwargs):
+        data = request.raw_post_data
+        if not data:
+            return self.render_invalid_response()
+        try:
+            data = json.loads(data)
+        except ValueError:
+            return self.render_invalid_response('invalid-json')
+        if not isinstance(data, dict):
+            return self.render_invalid_response('invalid-json')
+        if not 'app' in data or not 'model' in data:
+            return self.render_invalid_response('no-app-or-model')
+        if not 'flag_type' in data or not 'note' in data:
+            return self.render_invalid_response('missing-fields')
+        try:
+            ct = ContentType.objects.get(app_label=data['app'], model=data['model'])
+        except ContentType.DoesNotExist:
+            return self.render_invalid_response('unknown-object-type')
+        cls = ct.model_class()
+        try:
+            cls.objects.get(pk=data['id'])
+        except cls.DoesNotExist:
+            return self.render_invalid_response('does-not-exist')
+        if request.user.is_authenticated():
+            user = request.user
+        else:
+            user = None
+        flag = FlaggedObject(object_type=ct, object_id=data['id'], flag_type_id=data['flag_type'],
+                             note=data['note'], user=user)
+        flag.save()
+        result = {
+            'result': 'ok',
+            'flag_id': flag.pk,
+        }
+        return self.render_json_response(result)