✨ [#5016] Add Referentielijsten service select to builder

and modify the services API endpoint to retrieve referentielijsten services based on a query parameter

src/openforms/js/components/formio_builder/WebformBuilder.js

@@ -24,6 +24,7 @@ import {
   getRegistrationAttributes,
   getValidatorPlugins,
 } from './plugins';
+import {getServices} from './referentielijsten';
 
 let _supportedLanguages = undefined;
 const getSupportedLanguages = () => {
@@ -167,6 +168,7 @@ class WebformBuilder extends WebformBuilderFormio {
             getFormComponents={() => this.webform.form.components}
             getValidatorPlugins={getValidatorPlugins}
             getRegistrationAttributes={getRegistrationAttributes}
+            getServices={getServices}
             getPrefillPlugins={getPrefillPlugins}
             getPrefillAttributes={getPrefillAttributes}
             getFileTypes={async () => FILE_TYPES}

src/openforms/js/components/formio_builder/referentielijsten.js

@@ -0,0 +1,6 @@
+import {get} from 'utils/fetch';
+
+export const getServices = async type => {
+  const resp = await get(`/api/v2/services?type=${encodeURIComponent(type)}`);
+  return resp.data;
+};

src/openforms/services/api/serializers.py

@@ -10,6 +10,7 @@ class Meta:
         model = Service
         fields = (
             "url",
+            "slug",
             "label",
             "api_root",
             "api_type",

src/openforms/services/api/viewsets.py

@@ -5,6 +5,7 @@
 from zgw_consumers.models import Service
 
 from openforms.api.utils import mark_experimental
+from openforms.config.models import GlobalConfiguration
 
 from . import serializers
 
@@ -30,3 +31,10 @@ class ServiceViewSet(viewsets.ReadOnlyModelViewSet):
     serializer_class = serializers.ServiceSerializer
 
     queryset = Service.objects.all()
+
+    def get_queryset(self):
+        qs = super().get_queryset()
+        if self.request.query_params.get("type") == "referentielijsten":
+            config = GlobalConfiguration.get_solo()
+            return config.referentielijsten_services
+        return qs