Setting up ARKs as aliases

islandora_local.module

<?php

use Drupal\Core\Render\BubbleableMetadata;

/**
 * Implements hook_token_info().
 */
function islandora_local_token_info() {
  $type = [
    'name' => t('Local'),
    'description' => t('Locally defined tokens.'),
    'needs-data' => 'node',
  ];

  $node['dc-ark'] = [
    'name' => t("DC ARK"),
    'description' => t("The ARK from the field_archival_resource_key field."),
  ];

  return [
    'types' => ['node' => $type],
    'tokens' => ['node' => $node],
  ];
}

/**
 * Implements hook_tokens().
 */
function islandora_local_tokens($type, $tokens, array $data, array $options, BubbleableMetadata $bubbleable_metadata) {
  $replacements = [];
  $ark_field_id = 'field_archival_resource_key';
  if ($type == 'node' && !empty($data['node'])) {
    /** @var \Drupal\node\NodeInterface $node */
    $node = $data['node'];

    foreach ($tokens as $name => $original) {
      switch ($name) {
        // Simple key values on the node.
        case 'dc-ark':
          $type = $node->getType();
          $matches = [];
          if (isset($node->get($ark_field_id)->uri) && preg_match('#ark:/\d+/.*#i', $node->get($ark_field_id)->uri, $matches)) {
            $replacements[$original] = $matches[0];
          }
          else {
            $replacements[$original] = "/node/{$node->id()}";
          }
          break;
      }
    }

  }
  return $replacements;
}

pathauto.pattern.dc_ark.yml

langcode: en
status: true
dependencies:
  module:
    - node
id: dc_ark
label: 'DC Object ARK'
type: 'canonical_entities:node'
pattern: '[node:dc-ark]'
selection_criteria:
  886b9506-4a92-4437-81c6-a7600ff02fb2:
    id: node_type
    negate: false
    uuid: 886b9506-4a92-4437-81c6-a7600ff02fb2
    context_mapping:
      node: node
    bundles:
      dc_object: dc_object
selection_logic: and
weight: -5
relationships: {  }

pathauto.settings.yml

enabled_entity_types:
  - user
punctuation:
  double_quotes: 0
  quotes: 0
  backtick: 0
  comma: 0
  period: 0
  hyphen: 1
  underscore: 0
  colon: 0
  semicolon: 0
  pipe: 0
  left_curly: 0
  left_square: 0
  right_curly: 0
  right_square: 0
  plus: 0
  equal: 0
  asterisk: 0
  ampersand: 0
  percent: 0
  caret: 0
  dollar: 0
  hash: 0
  at: 0
  exclamation: 0
  tilde: 0
  left_parenthesis: 0
  right_parenthesis: 0
  question_mark: 0
  less_than: 0
  greater_than: 0
  slash: 0
  back_slash: 0
verbose: false
separator: '-'
max_length: 100
max_component_length: 100
transliterate: true
reduce_ascii: false
case: true
ignore_words: 'a, an, as, at, before, but, by, for, from, is, in, into, like, of, off, on, onto, per, since, than, the, this, that, to, up, via, with'
update_action: 2
safe_tokens:
  - alias
  - path
  - join-path
  - login-url
  - url
  - url-brief
  - dc-ark