feat: Add validator that leverages symfony/validation constraints.

composer.json

@@ -38,7 +38,7 @@
   },
   "require": {
     "php": "^8.1",
-    "silverstripe/framework": "^5.1.0"
+    "silverstripe/framework": "^5.2"
   },
   "require-dev": {
     "silverstripe/cms": "^5",

src/Validators/ConstraintsValidator.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace Signify\ComposableValidators\Validators;
+
+use Signify\ComposableValidators\Traits\ValidatesMultipleFieldsWithConfig;
+use SilverStripe\Forms\FormField;
+use SilverStripe\Core\Validation\ConstraintValidator;
+
+/**
+ * A validator which Validates values based on symfony validation constraints.
+ *
+ * Configuration values for this validator are a constraint or array of constraints to validate each field value against.
+ * For example:
+ * $validator->addField('IpAddress', new Symfony\Component\Validator\Constraints\Ip());
+ *
+ * See https://symfony.com/doc/current/reference/constraints.html for a list of constraints.
+ *
+ * This validator is best used within an AjaxCompositeValidator in conjunction with
+ * a SimpleFieldsValidator.
+ */
+class ConstraintsValidator extends BaseValidator
+{
+    use ValidatesMultipleFieldsWithConfig;
+
+    /**
+     * Validates that the required blocks exist in the configured positions.
+     *
+     * @param array $data
+     * @return bool
+     */
+    public function php($data)
+    {
+        foreach ($this->getFields() as $fieldName => $constraint) {
+            $value = isset($data[$fieldName]) ? $data[$fieldName] : null;
+            $this->result->combineAnd(ConstraintValidator::validate($value, $constraint, $fieldName));
+        }
+
+        return $this->result->isValid();
+    }
+
+    protected function getValidationHintForField(FormField $field): ?array
+    {
+        // @TODO decide if there's a nice way to implement this
+        return null;
+    }
+}