trait ContextHandlerIntegrityTrait in Rules 8.3

trait ContextHandlerIntegrityTrait {
  use ContextHandlerTrait;

  /**
   * Performs the integrity check.
   *
   * @param \Drupal\Core\Plugin\ContextAwarePluginInterface $plugin
   *   The plugin with its defined context.
   * @param \Drupal\rules\Context\ExecutionMetadataStateInterface $metadata_state
   *   The current configuration state with all defined variables that are
   *   available.
   *
   * @return \Drupal\rules\Engine\IntegrityViolationList
   *   The list of integrity violations.
   */
  protected function checkContextConfigIntegrity(CoreContextAwarePluginInterface $plugin, ExecutionMetadataStateInterface $metadata_state) {
    $violation_list = new IntegrityViolationList();
    $context_definitions = $plugin
      ->getContextDefinitions();

    // Make sure that all provided variables by this plugin are added to the
    // execution metadata state.
    $this
      ->addProvidedContextDefinitions($plugin, $metadata_state);
    foreach ($context_definitions as $name => $context_definition) {

      // Check if a data selector is configured that maps to the state.
      if (isset($this->configuration['context_mapping'][$name])) {
        try {
          $data_definition = $this
            ->getMappedDefinition($name, $metadata_state);
          $this
            ->checkDataTypeCompatible($context_definition, $data_definition, $name, $violation_list);
        } catch (IntegrityException $e) {
          $violation = new IntegrityViolation();
          $violation
            ->setMessage($this
            ->t('Data selector %selector for context %context_name is invalid. @message', [
            '%selector' => $this->configuration['context_mapping'][$name],
            '%context_name' => $context_definition
              ->getLabel(),
            '@message' => $e
              ->getMessage(),
          ]));
          $violation
            ->setContextName($name);
          $violation
            ->setUuid($this
            ->getUuid());
          $violation_list
            ->add($violation);
        }
        if ($context_definition instanceof RulesContextDefinitionInterface && $context_definition
          ->getAssignmentRestriction() === RulesContextDefinitionInterface::ASSIGNMENT_RESTRICTION_INPUT) {
          $violation = new IntegrityViolation();
          $violation
            ->setMessage($this
            ->t('The context %context_name may not be configured using a selector.', [
            '%context_name' => $context_definition
              ->getLabel(),
          ]));
          $violation
            ->setContextName($name);
          $violation
            ->setUuid($this
            ->getUuid());
          $violation_list
            ->add($violation);
        }
      }
      elseif (isset($this->configuration['context_values'][$name])) {
        if ($context_definition instanceof RulesContextDefinitionInterface && $context_definition
          ->getAssignmentRestriction() === RulesContextDefinitionInterface::ASSIGNMENT_RESTRICTION_SELECTOR) {
          $violation = new IntegrityViolation();
          $violation
            ->setMessage($this
            ->t('The context %context_name may only be configured using a selector.', [
            '%context_name' => $context_definition
              ->getLabel(),
          ]));
          $violation
            ->setContextName($name);
          $violation
            ->setUuid($this
            ->getUuid());
          $violation_list
            ->add($violation);
        }
      }
      elseif ($context_definition
        ->isRequired() && $context_definition
        ->getDefaultValue() === NULL) {
        $violation = new IntegrityViolation();
        $violation
          ->setMessage($this
          ->t('The required context %context_name is missing.', [
          '%context_name' => $context_definition
            ->getLabel(),
        ]));
        $violation
          ->setContextName($name);
        $violation
          ->setUuid($this
          ->getUuid());
        $violation_list
          ->add($violation);
      }
    }
    if ($plugin instanceof ContextProviderInterface) {
      $provided_context_definitions = $plugin
        ->getProvidedContextDefinitions();
      foreach ($provided_context_definitions as $name => $context_definition) {
        if (isset($this->configuration['provides_mapping'][$name]) && !preg_match('/^[0-9a-zA-Z_]*$/', $this->configuration['provides_mapping'][$name])) {
          $violation = new IntegrityViolation();
          $violation
            ->setMessage($this
            ->t('Provided variable name %name contains not allowed characters.', [
            '%name' => $this->configuration['provides_mapping'][$name],
          ]));
          $violation
            ->setContextName($name);
          $violation
            ->setUuid($this
            ->getUuid());
          $violation_list
            ->add($violation);
        }
      }
    }
    return $violation_list;
  }

  /**
   * Checks that the data type of a mapped variable matches the expectation.
   *
   * @param \Drupal\Core\Plugin\Context\ContextDefinitionInterface $context_definition
   *   The context definition of the context on the plugin.
   * @param \Drupal\Core\TypedData\DataDefinitionInterface $provided
   *   The data definition of the mapped variable to the context.
   * @param string $context_name
   *   The name of the context on the plugin.
   * @param \Drupal\rules\Engine\IntegrityViolationList $violation_list
   *   The list of violations where new ones will be added.
   */
  protected function checkDataTypeCompatible(CoreContextDefinitionInterface $context_definition, DataDefinitionInterface $provided, $context_name, IntegrityViolationList $violation_list) {

    // Compare data types. For now, fail if they are not equal.
    // @todo Add support for matching based upon type-inheritance.
    $target_type = $context_definition
      ->getDataDefinition()
      ->getDataType();

    // Special case any and entity target types for now.
    if ($target_type == 'any' || $target_type == 'entity' && strpos($provided
      ->getDataType(), 'entity:') !== FALSE) {
      return;
    }
    if ($target_type != $provided
      ->getDataType()) {
      $expected_type_problem = $context_definition
        ->getDataDefinition()
        ->getDataType();
      $violation = new IntegrityViolation();
      $violation
        ->setMessage($this
        ->t('Expected a @expected_type data type for context %context_name but got a @provided_type data type instead.', [
        '@expected_type' => $expected_type_problem,
        '%context_name' => $context_definition
          ->getLabel(),
        '@provided_type' => $provided
          ->getDataType(),
      ]));
      $violation
        ->setContextName($context_name);
      $violation
        ->setUuid($this
        ->getUuid());
      $violation_list
        ->add($violation);
    }
  }

}