validate twig template value before saving it

src/models/Twig.php

@@ -4,6 +4,9 @@
 
 use bedezign\yii2\audit\AuditTrailBehavior;
 use dmstr\modules\prototype\traits\EditorEntry;
+use Twig\Error\Error as TwigError;
+use Yii;
+use yii\base\InvalidConfigException;
 
 /**
  * This is the model class for table "app_twig".
@@ -30,4 +33,50 @@ public function behaviors()
         $behaviors['audit-trail'] = AuditTrailBehavior::class;
         return $behaviors;
     }
+
+    /**
+     * @inheritdoc
+     */
+    public function rules()
+    {
+        $rules = parent::rules();
+        $rules[] = [
+            'value',
+            'string'
+        ];
+        $rules[] = [
+            'value',
+            'validateTwigTemplate'
+        ];
+        return $rules;
+    }
+
+    /**
+     * @param $attribute
+     *
+     * @throws \yii\base\InvalidConfigException
+     * @return void
+     */
+    public function validateTwigTemplate($attribute)
+    {
+        /** @var \yii\twig\ViewRenderer|null $twigRenderer */
+        $twigRendererConfig = Yii::$app->view->renderers['twig'] ?? null;
+
+
+        if (is_null($twigRendererConfig)) {
+            throw new InvalidConfigException('TWIG renderer must be defined');
+        }
+
+        $twigRenderer = Yii::createObject($twigRendererConfig);
+        $environment = $twigRenderer->twig;
+        try {
+            $template = $environment->createTemplate($this->$attribute);
+            $template->render();
+        } catch (TwigError $e) {
+            $this->addError($attribute, Yii::t('prototype', 'Line {lineNumber}: {message}', [
+                'lineNumber' => $e->getTemplateLine(),
+                'message' => $e->getRawMessage()
+            ]));
+        }
+    }
 }