17219 fix custom validator display if function (#17247)

* 17219 fix custom validator display if function

* 17219 fix custom validator display if function

* 17219 use custom json encoder

* Fix system config export

---------

Co-authored-by: Jeremy Stretch <jstretch@netboxlabs.com>

netbox/core/views.py

@@ -25,12 +25,14 @@ from rq.registry import (
 from rq.worker import Worker
 from rq.worker_registration import clean_worker_registry
 
+from extras.validators import CustomValidator
 from netbox.config import get_config, PARAMS
 from netbox.views import generic
 from netbox.views.generic.base import BaseObjectView
 from netbox.views.generic.mixins import TableMixin
 from utilities.forms import ConfirmationForm
 from utilities.htmx import htmx_partial
+from utilities.json import ConfigJSONEncoder
 from utilities.query import count_related
 from utilities.views import ContentTypePermissionRequiredMixin, GetRelatedModelsMixin, register_model_view
 from . import filtersets, forms, tables
@@ -572,13 +574,17 @@ class SystemView(UserPassesTestMixin, View):
                     k: getattr(config, k) for k in sorted(params)
                 },
             }
-            response = HttpResponse(json.dumps(data, indent=4), content_type='text/json')
+            response = HttpResponse(json.dumps(data, cls=ConfigJSONEncoder, indent=4), content_type='text/json')
             response['Content-Disposition'] = 'attachment; filename="netbox.json"'
             return response
 
         plugins_table = tables.PluginTable(plugins, orderable=False)
         plugins_table.configure(request)
 
+        # Serialize any CustomValidator classes
+        if hasattr(config, 'CUSTOM_VALIDATORS') and config.CUSTOM_VALIDATORS:
+            config.CUSTOM_VALIDATORS = json.dumps(config.CUSTOM_VALIDATORS, cls=ConfigJSONEncoder, indent=4)
+
         return render(request, 'core/system.html', {
             'stats': stats,
             'plugins_table': plugins_table,

netbox/templates/core/inc/config_data.html

@@ -95,7 +95,7 @@
   <tr>
     <th scope="row" class="ps-3">{% trans "Custom validators" %}</th>
     {% if config.CUSTOM_VALIDATORS %}
-      <td><pre>{{ config.CUSTOM_VALIDATORS|json }}</pre></td>
+      <td><pre>{{ config.CUSTOM_VALIDATORS }}</pre></td>
     {% else %}
       <td>{{ ''|placeholder }}</td>
     {% endif %}

netbox/utilities/json.py

@@ -3,6 +3,7 @@ import decimal
 from django.core.serializers.json import DjangoJSONEncoder
 
 __all__ = (
+    'ConfigJSONEncoder',
     'CustomFieldJSONEncoder',
 )
 
@@ -15,3 +16,16 @@ class CustomFieldJSONEncoder(DjangoJSONEncoder):
         if isinstance(o, decimal.Decimal):
             return float(o)
         return super().default(o)
+
+
+class ConfigJSONEncoder(DjangoJSONEncoder):
+    """
+    Override Django's built-in JSON encoder to serialize CustomValidator classes as strings.
+    """
+    def default(self, o):
+        from extras.validators import CustomValidator
+
+        if issubclass(type(o), CustomValidator):
+            return type(o).__name__
+
+        return super().default(o)