install data table

backend/app/Services/DataTable/Validators/RelationValidator.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Services\DataTable\Validators;
+
+use App\Services\DataTable\Exceptions\InvalidRelationException;
+
+class RelationValidator
+{
+    public static function validate(?array $rels, array $allowedRelations): bool
+    {
+        foreach ($rels as $relation) {
+
+            if (!self::isAllowed($relation, $allowedRelations)) {
+                throw new InvalidRelationException($relation, "relation `$relation` is not allowed.");
+            }
+        }
+
+        return true;
+    }
+
+    public static function isAllowed(string $relation, array $allowedRelations): bool
+    {
+        return !$relation || in_array($relation, $allowedRelations);
+    }
+}