create voter which blocks deletion if a workflow exists

src/Bundle/ChillMainBundle/DependencyInjection/ChillMainExtension.php

@@ -256,6 +256,13 @@ class ChillMainExtension extends Extension implements
             'channels' => ['chill'],
         ]);
 
+        $container->prependExtensionConfig('security', [
+            'access_decision_manager' => [
+                'strategy' => 'unanimous',
+                'allow_if_all_abstain' => false,
+            ],
+        ]);
+
         //add crud api
         $this->prependCruds($container);
     }

src/Bundle/ChillMainBundle/Repository/Workflow/EntityWorkflowRepository.php

@@ -55,6 +55,30 @@ class EntityWorkflowRepository implements ObjectRepository
         return (int) $qb->getQuery()->getSingleScalarResult();
     }
 
+    public function countRelatedWorkflows(array $relateds): int
+    {
+        $qb = $this->repository->createQueryBuilder('w');
+
+        $orX = $qb->expr()->orX();
+        $i = 0;
+
+        foreach ($relateds as $related) {
+            $orX->add(
+                $qb->expr()->andX(
+                    $qb->expr()->eq('w.relatedEntityClass', ':entity_class_' . $i),
+                    $qb->expr()->eq('w.relatedEntityId', ':entity_id_' . $i)
+                )
+            );
+            $qb
+                ->setParameter('entity_class_' . $i, $related['entityClass'])
+                ->setParameter('entity_id_' . $i, $related['entityId']);
+            ++$i;
+        }
+        $qb->where($orX);
+
+        return $qb->select('COUNT(w)')->getQuery()->getSingleScalarResult();
+    }
+
     public function find($id): ?EntityWorkflow
     {
         return $this->repository->find($id);

src/Bundle/ChillMainBundle/Security/Authorization/WorkflowEntityDeletionVoter.php

@@ -0,0 +1,65 @@
+<?php
+
+/**
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Chill\MainBundle\Security\Authorization;
+
+use Chill\MainBundle\Repository\Workflow\EntityWorkflowRepository;
+use Chill\MainBundle\Workflow\EntityWorkflowHandlerInterface;
+use RuntimeException;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Authorization\Voter\Voter;
+use function in_array;
+use function is_object;
+
+class WorkflowEntityDeletionVoter extends Voter
+{
+    private EntityWorkflowRepository $entityWorkflowRepository;
+
+    /**
+     * @var iterable|EntityWorkflowHandlerInterface[]
+     */
+    private iterable $handlers;
+
+    public function __construct($handlers, EntityWorkflowRepository $entityWorkflowRepository)
+    {
+        $this->handlers = $handlers;
+        $this->entityWorkflowRepository = $entityWorkflowRepository;
+    }
+
+    protected function supports($attribute, $subject)
+    {
+        if (!is_object($subject)) {
+            return false;
+        }
+
+        foreach ($this->handlers as $handler) {
+            if ($handler->isObjectSupported($subject)
+                && in_array($attribute, $handler->getDeletionRoles($subject), true)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    protected function voteOnAttribute($attribute, $subject, TokenInterface $token)
+    {
+        foreach ($this->handlers as $handler) {
+            if ($handler->isObjectSupported($subject)) {
+                return 0 === $this->entityWorkflowRepository->countRelatedWorkflows(
+                    $handler->getRelatedObjects($subject)
+                );
+            }
+        }
+
+        throw new RuntimeException('no handlers found');
+    }
+}

src/Bundle/ChillMainBundle/Workflow/EntityWorkflowHandlerInterface.php

@@ -15,12 +15,19 @@ use Chill\MainBundle\Entity\Workflow\EntityWorkflow;
 
 interface EntityWorkflowHandlerInterface
 {
+    /**
+     * @return array|string[]
+     */
+    public function getDeletionRoles(): array;
+
     public function getEntityData(EntityWorkflow $entityWorkflow, array $options = []): array;
 
     public function getEntityTitle(EntityWorkflow $entityWorkflow, array $options = []): string;
 
     public function getRelatedEntity(EntityWorkflow $entityWorkflow): ?object;
 
+    public function getRelatedObjects(object $object): array;
+
     /**
      * Return a string representing the role required for seeing the workflow.
      *
@@ -33,6 +40,8 @@ interface EntityWorkflowHandlerInterface
 
     public function getTemplateData(EntityWorkflow $entityWorkflow, array $options = []): array;
 
+    public function isObjectSupported(object $object): bool;
+
     public function supports(EntityWorkflow $entityWorkflow, array $options = []): bool;
 
     public function supportsFreeze(EntityWorkflow $entityWorkflow, array $options = []): bool;

src/Bundle/ChillMainBundle/config/services/security.yaml

@@ -75,3 +75,9 @@ services:
             $locker: '@Chill\MainBundle\Security\PasswordRecover\PasswordRecoverLocker'
         tags:
             - { name: security.voter }
+
+    Chill\MainBundle\Security\Authorization\WorkflowEntityDeletionVoter:
+        autoconfigure: true
+        autowire: true
+        arguments:
+            $handlers: !tagged_iterator chill_main.workflow_handler