ppi_print_variant.module

<?php

use Drupal\Core\Url;
use Drupal\Core\Routing\RouteMatchInterface;

function ppi_print_variant_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
      case 'help.page.ppi_print_variant':
          $output = '';
          $output .= '<h3>' . t('About') . '</h3>';
          $output .= '<p>' . t('Create new content from existing content without online specific paragraphs.') . '</p>';
          return  $output;

      default:
  }
}

/**
 * Implements hook_entity_type_build().
 */
function ppi_print_variant_entity_type_build(array &$entity_types) {
  if(isset($entity_types['node'])) {
    $entity_types['node']->setFormClass('ppi_print_variant', 'Drupal\ppi_print_variant\Form\PpiPrintVariantNodeForm');
  }

}

/**
 * Implements hook_entity_operation().
 */
function ppi_print_variant_entity_operation(\Drupal\Core\Entity\EntityInterface $entity) {
  $operations = [];
  $bundle = $entity->bundle();

  // Only add an operation for node entities.
  if ($entity->getEntityTypeId() !== 'node') {
    return $operations;
  }
  
  if (!_ppi_print_variant_has_print_variant_permission($bundle)) {
    return $operations;
  }

  $path = '/ppi/' . $entity->id() . '/print_variant';
  $operations['print_variant'] = [
    'title' => t('Create Print Variant'),
    'weight' => '100',
    'url' => Url::fromUri('internal:/' . trim($path, '/')),
  ];

  return $operations;
}

/**
 * Determine if the current user has permission to create a print variant.
 *
 * @param string $bundle
 *   The bundle machine name to examine.
 *
 * @return bool
 *   TRUE or FALSE
 */
function _ppi_print_variant_has_print_variant_permission($bundle) {
  if(!is_string($bundle)) {
    throw new InvalidArgumentException('Argument 1 passed to _ppi_print_variant_has_print_variant_permission() must be of type string, ' . gettype($bundle) . ' given.');
  }
  $current_user = \Drupal::currentUser();
  if ($current_user->hasPermission("administer nodes")) {
    return TRUE;
  }
  if ($current_user->hasPermission("bypass node access")) {
    return TRUE;
  }
  if ($current_user->hasPermission("print_variant $bundle content") && $current_user->hasPermission("create $bundle content")) {
    return TRUE;
  }
  return FALSE;
}