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application/Espo/Core/FieldValidation/CheckerFactory.php

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+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\FieldValidation;
+
+use Espo\Core\Utils\Metadata;
+use Espo\Core\InjectableFactory;
+
+use RuntimeException;
+
+class CheckerFactory
+{
+    /** @var array<string, ?class-string> */
+    private $classNameCache = [];
+
+    public function __construct(
+        private Metadata $metadata,
+        private InjectableFactory $injectableFactory
+    ) {}
+
+    /**
+     * Whether a field validator can be created.
+     */
+    public function isCreatable(string $entityType, string $field): bool
+    {
+        return (bool) $this->getClassName($entityType, $field);
+    }
+
+    /**
+     * Create a validator (checker).
+     *
+     * @throws RuntimeException
+     */
+    public function create(string $entityType, string $field): object
+    {
+        $className = $this->getClassName($entityType, $field);
+
+        if (!$className) {
+            throw new RuntimeException("Validator for '{$entityType}.{$field}' does not exist.");
+        }
+
+        return $this->injectableFactory->create($className);
+    }
+
+    /**
+     * @return ?class-string
+     */
+    private function getClassName(string $entityType, string $field): ?string
+    {
+        $key = $entityType . '_' . $field;
+
+        if (!array_key_exists($key, $this->classNameCache)) {
+            $this->classNameCache[$key] = $this->getClassNameNoCache($entityType, $field);
+        }
+
+        return $this->classNameCache[$key];
+    }
+
+    /**
+     * @return ?class-string
+     */
+    private function getClassNameNoCache(string $entityType, string $field): ?string
+    {
+        $className1 = $this->metadata
+            ->get(['entityDefs', $entityType, 'fields', $field, 'validatorClassName']);
+
+        if ($className1) {
+            return $className1;
+        }
+
+        $fieldType = $this->metadata
+            ->get(['entityDefs', $entityType, 'fields', $field, 'type']);
+
+        $className2 = $this->metadata
+            ->get(['fields', $fieldType, 'validatorClassName']);
+
+        if ($className2) {
+            return $className2;
+        }
+
+        $className3 = 'Espo\\Classes\\FieldValidators\\' . ucfirst($fieldType) . 'Type';
+
+        if (class_exists($className3)) {
+            return $className3;
+        }
+
+        return null;
+    }
+}