access_policy-1.0.x-dev/src/Plugin/access_policy/AccessRule/EntityFieldBoolean.php

<?php

namespace Drupal\access_policy\Plugin\access_policy\AccessRule;

use Drupal\Core\Form\FormStateInterface;

/**
 * Restrict content by comparing boolean fields on the entity.
 *
 * @AccessRule(
 *   id = "entity_field_boolean",
 *   handlers = {
 *     "query_alter" = "\Drupal\access_policy\AccessRuleQueryHandler\EntityFieldBoolean"
 *   }
 * )
 */
class EntityFieldBoolean extends EntityFieldBase {

  /**
   * {@inheritdoc}
   */
  public function defaultSettings() {
    return [
      "operator" => '=',
    ] + parent::defaultSettings();
  }

  /**
   * {@inheritdoc}
   */
  protected function valueForm(array &$form, FormStateInterface $form_state) {
    $form['value'] = [
      '#type' => 'select',
      '#title' => $this->t('Value'),
      '#options' => [
        'true' => $this->t('True'),
        'false' => $this->t('False'),
      ],
      '#default_value' => $this->settings['value'],
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function operators() {
    $operators = [
      '=' => [
        'title' => $this->t('Is equal to'),
        'method' => 'validateSimple',
      ],
      '!=' => [
        'title' => $this->t('Is not equal to'),
        'method' => 'validateSimple',
      ],
    ];

    return $operators;
  }

  /**
   * Validate operators.
   *
   * @param mixed $expected
   *   The expected value.
   * @param mixed $actual
   *   The actual value.
   *
   * @return bool
   *   TRUE if operator passes; FALSE otherwise.
   */
  public function validateSimple($expected, $actual) {
    $op = $this->getOperator();
    switch ($op) {
      case '=':
        return $this->equals($expected, $actual);

      case '!=':
        return $this->notEquals($expected, $actual);
    }

    return FALSE;
  }

  /**
   * {@inheritdoc}
   */
  public function adminSummary() {
    return $this->getOperator() . ' ' . $this->settings['value'];
  }

  /**
   * {@inheritdoc}
   */
  public function getValue() {
    // This ensures that the value returned is always a boolean.
    $values = parent::getValue();
    return array_map(function ($value) {
      return filter_var($value, FILTER_VALIDATE_BOOLEAN);
    }, $values);
  }

}