NEW Wire up symfony/validator

composer.json

@@ -46,6 +46,7 @@
         "symfony/mailer": "^6.1",
         "symfony/mime": "^6.1",
         "symfony/translation": "^6.1",
+        "symfony/validator": "^6.1",
         "symfony/yaml": "^6.1",
         "ext-ctype": "*",
         "ext-dom": "*",

src/Core/Validation/ConstraintValidator.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace SilverStripe\Core\Validation;
+
+use InvalidArgumentException;
+use SilverStripe\ORM\ValidationResult;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintViolationInterface;
+use Symfony\Component\Validator\Validation;
+
+/**
+ * Helper class to abstract away wiring up symfony/validator and getting ValidationResult from validating
+ * symfony validator constraints.
+ */
+class ConstraintValidator
+{
+    /**
+     * Validate a value by a constraint
+     *
+     * @param Constraint|Constraint[] $constraints a constraint or array of constraints to validate against
+     * @param string $fieldName The field name the value relates to, if relevant
+     */
+    public static function validate(mixed $value, Constraint|array $constraints, string $fieldName = ''): ValidationResult
+    {
+        if (is_array($constraints) && empty($constraints)) {
+            throw new InvalidArgumentException('$constraints must not be an empty array');
+        }
+
+        // Perform validation
+        $validator = Validation::createValidator();
+        $violations = $validator->validate($value, $constraints);
+
+        // Convert value to ValidationResult
+        $result = ValidationResult::create();
+        /** @var ConstraintViolationInterface $violation */
+        foreach ($violations as $violation) {
+            if ($fieldName) {
+                $result->addFieldError($fieldName, $violation->getMessage());
+            } else {
+                $result->addError($violation->getMessage());
+            }
+        }
+
+        return $result;
+    }
+}