[Workflow] Added guard 'is_valid()' method support

Author: halundraN

CHANGELOG.md

@@ -4,6 +4,7 @@ CHANGELOG
 3.4.0
 -----
 
+ * Add guard `is_valid()` method support
  * Added support for `Event::getWorkflowName()` for "announce" events.
  * Added `workflow.completed` events which are fired after a transition is completed.
 

EventListener/ExpressionLanguage.php

@@ -12,6 +12,8 @@
 namespace Symfony\Component\Workflow\EventListener;
 
 use Symfony\Component\Security\Core\Authorization\ExpressionLanguage as BaseExpressionLanguage;
+use Symfony\Component\Validator\Validator\ValidatorInterface;
+use Symfony\Component\Workflow\Exception\RuntimeException;
 
 /**
  * Adds some function to the default Symfony Security ExpressionLanguage.
@@ -29,5 +31,17 @@ protected function registerFunctions()
         }, function (array $variables, $attributes, $object = null) {
             return $variables['auth_checker']->isGranted($attributes, $object);
         });
+
+        $this->register('is_valid', function ($object = 'null', $groups = 'null') {
+            return sprintf('0 === count($validator->validate(%s, null, %s))', $object, $groups);
+        }, function (array $variables, $object = null, $groups = null) {
+            if (!$variables['validator'] instanceof ValidatorInterface) {
+                throw new RuntimeException('Validator not defined, did you install the component?');
+            }
+
+            $errors = $variables['validator']->validate($object, null, $groups);
+
+            return 0 === count($errors);
+        });
     }
 }

EventListener/GuardListener.php

@@ -15,6 +15,7 @@
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Symfony\Component\Security\Core\Authorization\AuthorizationCheckerInterface;
 use Symfony\Component\Security\Core\Role\RoleHierarchyInterface;
+use Symfony\Component\Validator\Validator\ValidatorInterface;
 use Symfony\Component\Workflow\Event\GuardEvent;
 
 /**
@@ -28,15 +29,17 @@ class GuardListener
     private $authenticationChecker;
     private $trustResolver;
     private $roleHierarchy;
+    private $validator;
 
-    public function __construct($configuration, ExpressionLanguage $expressionLanguage, TokenStorageInterface $tokenStorage, AuthorizationCheckerInterface $authenticationChecker, AuthenticationTrustResolverInterface $trustResolver, RoleHierarchyInterface $roleHierarchy = null)
+    public function __construct($configuration, ExpressionLanguage $expressionLanguage, TokenStorageInterface $tokenStorage, AuthorizationCheckerInterface $authenticationChecker, AuthenticationTrustResolverInterface $trustResolver, RoleHierarchyInterface $roleHierarchy = null, ValidatorInterface $validator = null)
     {
         $this->configuration = $configuration;
         $this->expressionLanguage = $expressionLanguage;
         $this->tokenStorage = $tokenStorage;
         $this->authenticationChecker = $authenticationChecker;
         $this->trustResolver = $trustResolver;
         $this->roleHierarchy = $roleHierarchy;
+        $this->validator = $validator;
     }
 
     public function onTransition(GuardEvent $event, $eventName)
@@ -72,6 +75,8 @@ private function getVariables(GuardEvent $event)
             'auth_checker' => $this->authenticationChecker,
             // needed for the is_* expression function
             'trust_resolver' => $this->trustResolver,
+            // needed for the is_valid expression function
+            'validator' => $this->validator,
         );
 
         return $variables;

Exception/RuntimeException.php

@@ -0,0 +1,21 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Workflow\Exception;
+
+/**
+ * Base RuntimeException for the Workflow component.
+ *
+ * @author Alain Flaus <alain.flaus@gmail.com>
+ */
+class RuntimeException extends \RuntimeException implements ExceptionInterface
+{
+}