QuizResultAnswerAccessControlHandler.php in Quiz 8.5

Namespace

Drupal\quiz\Access

File

src/Access/QuizResultAnswerAccessControlHandler.php

<?php

namespace Drupal\quiz\Access;

use Drupal\Core\Access\AccessResultAllowed;
use Drupal\Core\Access\AccessResultForbidden;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\entity\UncacheableEntityAccessControlHandler;
use Drupal\quiz\Entity\QuizResultAnswer;
class QuizResultAnswerAccessControlHandler extends UncacheableEntityAccessControlHandler {

  /**
   * Control access to taking a question or viewing feedback within a quiz.
   *
   * {@inheritdoc}
   */
  function checkAccess(EntityInterface $entity, $operation, AccountInterface $account) {
    if ($operation == 'take') {

      /* @var $entity QuizResultAnswer */
      $quiz = $entity
        ->get('result_id')
        ->referencedEntities()[0]
        ->get('qid')
        ->referencedEntities()[0];
      if (empty($_SESSION['quiz'][$quiz
        ->id()]['result_id'])) {

        // No access if the user isn't taking this quiz.
        return AccessResultForbidden::forbidden();
      }
      if ($quiz
        ->get('allow_jumping')
        ->getString()) {

        // Access to go to any question. Yay.
        return AccessResultAllowed::allowed();
      }
      $qra_last = $entity
        ->getPrevious();
      $qra_next = $entity
        ->getNext();
      if (!$quiz
        ->get('backwards_navigation')
        ->getString()) {

        // No backwards navigation.
        if ($entity
          ->isAnswered()) {

          // This question was answered already.
          return AccessResultForbidden::forbidden();
        }
      }

      // Enforce normal navigation.
      if (!$qra_last || $qra_last
        ->isAnswered()) {

        // Previous answer was submitted or this is the first question.
        return AccessResultAllowed::allowed();
      }
      return AccessResultForbidden::forbidden();
    }
    if ($operation == 'feedback') {
      if ($entity
        ->isAnswered()) {

        // The user has answered this question, so they can see the feedback.
        return AccessResultAllowed::allowed();
      }

      // If they haven't answered the question, we want to make sure feedback is
      // blocked as it could be exposing correct answers.
      // @todo We may also want to check if they are viewing feedback for the
      // current question.
      return AccessResultForbidden::forbidden();
    }
    return parent::checkAccess($entity, $operation, $account);
  }

}

Classes

Name	Description
QuizResultAnswerAccessControlHandler