validation improvements

Author: Leshe4ka

frontend/src/widgets/ClusterConfigForm/Sections/Masking.tsx

@@ -176,6 +176,7 @@ const Masking = () => {
                     name={`masking.${index}.fieldsNamePattern`}
                     placeholder="Pattern"
                     type="text"
+                    withError
                   />
                   <MaskingCharReplacement nestedIdx={index} />
                   <Input

frontend/src/widgets/ClusterConfigForm/schema.ts

@@ -184,8 +184,54 @@ const maskingSchema = object({
   type: mixed<ApplicationConfigPropertiesKafkaMaskingTypeEnum>()
     .oneOf(Object.values(ApplicationConfigPropertiesKafkaMaskingTypeEnum))
     .required('required field'),
-  fields: array().of(object().shape({ value: string() })),
-  fieldsNamePattern: string(),
+  fields: array().of(
+    object().shape({
+      value: string().test(
+        'fieldsOrPattern',
+        'Either fields or fieldsNamePattern is required',
+        function (value, { path, parent, ...ctx }) {
+          const maskingItem = ctx.from?.[1].value;
+
+          if (value && value.trim() !== '') {
+            return true;
+          }
+
+          const otherFieldHasValue =
+            maskingItem.fields &&
+            maskingItem.fields.some(
+              (field: { value: string }) =>
+                field.value && field.value.trim() !== ''
+            );
+
+          if (otherFieldHasValue) {
+            return true;
+          }
+
+          const hasPattern =
+            maskingItem.fieldsNamePattern &&
+            maskingItem.fieldsNamePattern.trim() !== '';
+
+          return hasPattern;
+        }
+      ),
+    })
+  ),
+  fieldsNamePattern: string().test(
+    'fieldsOrPattern',
+    'Either fields or fieldsNamePattern is required',
+    (value, { parent }) => {
+      const hasValidFields =
+        parent.fields &&
+        parent.fields.length > 0 &&
+        parent.fields.some(
+          (field: { value: string }) => field.value && field.value.trim() !== ''
+        );
+
+      const hasPattern = value && value.trim() !== '';
+
+      return hasValidFields || hasPattern;
+    }
+  ),
   maskingCharsReplacement: array().of(object().shape({ value: string() })),
   replacement: string(),
   topicKeysPattern: string(),