Fix some verification and error reporting

api/v1/models/server.py

@@ -35,6 +35,11 @@ class OptionalSchemeURLValidator(URLValidator):
         super(OptionalSchemeURLValidator, self).__call__(value)
 
 
+# TODO: Validation should be probably be moved to `clean` method instead of `save`.
+# Currently the serializer handles ValidationError during input, and the only
+# other thing calling `save` should be the management tasks which should already
+# be validated so should be safe?
+# https://docs.djangoproject.com/en/5.0/ref/models/instances/#validating-objects
 class Server(models.Model):
     name = models.CharField(max_length=255, null=True, editable=False)
     url = models.CharField(
@@ -74,6 +79,11 @@ class Server(models.Model):
         parsed_url = urlparse(self.url)
         self.url = parsed_url.netloc.lower()
 
+        # Check if formatted server URL is unique
+        existing_server = Server.objects.filter(url=self.url).first()
+        if existing_server:
+            raise ValidationError("A server with this URL already exists.")
+
         # Validate the server API
         if not self.parse_server_api():
             if not self.created:

api/v1/views/server.py

@@ -58,7 +58,8 @@ class ServerDetailsViewSet(
     def get_object(self):
         queryset = self.filter_queryset(self.get_queryset())
         url_param = self.request.query_params.get("url")
-        if url_param is not None:
+        if url_param:
+            url_param = url_param.lower()
             try:
                 return queryset.get(url=url_param)
             except Server.DoesNotExist:
@@ -66,34 +67,43 @@ class ServerDetailsViewSet(
         return super().get_object()
 
     def create_server(self, url_param):
-        try:
         serializer = self.get_serializer(data={"url": url_param})
         serializer.is_valid(raise_exception=True)
         self.perform_create(serializer)
         return serializer.instance
-        except ValidationError as e:
-            raise Http404(e.message)
 
     def create(self, request, *args, **kwargs):
         url_param = request.data.get("url")
         if url_param:
+            url_param = url_param.lower()
             try:
                 server = Server.objects.get(url=url_param)
                 serializer = self.get_serializer(server)
                 return Response(serializer.data, status=status.HTTP_200_OK)
             except Server.DoesNotExist:
+                try:
                     instance = self.create_server(url_param)
                     serializer = self.get_serializer(instance)
                     return Response(serializer.data, status=status.HTTP_201_CREATED)
+                except ValidationError as e:
+                    return Response(
+                        {"url": e.messages}, status=status.HTTP_400_BAD_REQUEST
+                    )
 
     def list(self, request, *args, **kwargs):
         queryset = self.filter_queryset(self.get_queryset())
         url_param = self.request.query_params.get("url")
-        if url_param is not None:
+        if url_param:
+            url_param = url_param.lower()
             queryset = queryset.filter(url=url_param)
             if not queryset.exists():
+                try:
                     instance = self.create_server(url_param)
                     serializer = self.get_serializer(instance)
                     return Response(serializer.data, status=status.HTTP_201_CREATED)
+                except ValidationError as e:
+                    return Response(
+                        {"url": e.messages}, status=status.HTTP_400_BAD_REQUEST
+                    )
             return self.retrieve(request, *args, **kwargs)
         raise Http404("No URL provided.")

client/src/apiUtil.tsx

@@ -76,7 +76,7 @@ export const postData = async (inputText: string) => {
       // bad url or duplicate
       if (response.status === 400) {
         const responseData = await response.json();
-        message = responseData.url;
+        message = responseData.url || responseData.detail;
       }
       return {
         message,