Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\content_moderation;
Chris@0: 
Chris@0: use Drupal\Core\Entity\ContentEntityInterface;
Chris@0: use Drupal\Core\Session\AccountInterface;
Chris@0: use Drupal\workflows\Transition;
Chris@0: 
Chris@0: /**
Chris@0:  * Validates whether a certain state transition is allowed.
Chris@0:  */
Chris@0: class StateTransitionValidation implements StateTransitionValidationInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * The moderation information service.
Chris@0:    *
Chris@0:    * @var \Drupal\content_moderation\ModerationInformationInterface
Chris@0:    */
Chris@0:   protected $moderationInfo;
Chris@0: 
Chris@0:   /**
Chris@0:    * Stores the possible state transitions.
Chris@0:    *
Chris@0:    * @var array
Chris@0:    */
Chris@0:   protected $possibleTransitions = [];
Chris@0: 
Chris@0:   /**
Chris@0:    * Constructs a new StateTransitionValidation.
Chris@0:    *
Chris@0:    * @param \Drupal\content_moderation\ModerationInformationInterface $moderation_info
Chris@0:    *   The moderation information service.
Chris@0:    */
Chris@0:   public function __construct(ModerationInformationInterface $moderation_info) {
Chris@0:     $this->moderationInfo = $moderation_info;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function getValidTransitions(ContentEntityInterface $entity, AccountInterface $user) {
Chris@0:     $workflow = $this->moderationInfo->getWorkflowForEntity($entity);
Chris@0:     $current_state = $entity->moderation_state->value ? $workflow->getTypePlugin()->getState($entity->moderation_state->value) : $workflow->getTypePlugin()->getInitialState($entity);
Chris@0: 
Chris@0:     return array_filter($current_state->getTransitions(), function (Transition $transition) use ($workflow, $user) {
Chris@0:       return $user->hasPermission('use ' . $workflow->id() . ' transition ' . $transition->id());
Chris@0:     });
Chris@0:   }
Chris@0: 
Chris@0: }