Fixed filters and GTIN retrieval.

api/urls.py

@@ -11,5 +11,5 @@ router.register(r'products', GtinProductViewSet)
 
 urlpatterns = [
         path('', include(router.urls)),
-        path('api-auth/', include('rest_framework.urls', namespace='rest_framework'))
+        path('auth/', include('rest_framework.urls', namespace='rest_framework'))
     ]

api/views.py

@@ -1,6 +1,9 @@
-from django.shortcuts import render
-from rest_framework import viewsets
+from rest_framework import viewsets, status
 from rest_framework import permissions
+from rest_framework.decorators import action
+from rest_framework.response import Response
+
+import asset.gtin_service
 from api.serializers import ContainerSerializer, ContainerTypeSerializer, AssetSerializer, GtinProductSerializer
 from container.models import Container, ContainerType
 from asset.models import Asset, GtinProduct
@@ -36,7 +39,6 @@ class AssetViewSet(viewsets.ModelViewSet):
     filterset_fields = ['named_id', 'quantity']
 
 
-
 class GtinProductViewSet(viewsets.ModelViewSet):
     """
     API endpoint that allows containers to be viewed or edited.
@@ -46,3 +48,25 @@ class GtinProductViewSet(viewsets.ModelViewSet):
     permission_classes = [permissions.IsAuthenticated]
     filterset_fields = ['gtin']
 
+    def retrieve(self, request, pk=None):
+        if pk:
+            item = GtinProduct.objects.get(id=pk)
+            serializer = GtinProductSerializer(item)
+            return Response({"status": "success", "data": serializer.data}, status=status.HTTP_200_OK)
+
+        items = GtinProduct.objects.all()
+        serializer = GtinProductSerializer(items, many=True)
+        return Response({"status": "success", "data": serializer.data}, status=status.HTTP_200_OK)
+
+    @action(detail=True, methods=['GET'])
+    def by_gtin(self, request, gtin=None):
+        if gtin:
+            item = asset.gtin_service.get_by_gtin(gtin=gtin)
+            if item:
+                serializer = GtinProductSerializer(item)
+                return Response({"status": "success", "data": serializer.data}, status=status.HTTP_200_OK)
+            return Response(
+                {"status": "failed", "reason": "Could not find a product for given GTIN", "gtin": gtin},
+                status=status.HTTP_404_NOT_FOUND)
+        return Response({"status": "failed", "reason": "No GTIN given, please provide a valid GTIN"},
+                        status=status.HTTP_400_BAD_REQUEST)