tac_lite_create.module in Taxonomy Access Control Lite 8

Control term visibility in node edit form.

Use tac_lite to control which terms can be used when creating new content. Unlike tac_lite.module, which relies on Drupal's node_access features, this module uses hook_form_alter to change which terms are presented by the taxonomy module.

File

tac_lite_create/tac_lite_create.module

<?php

/**
 * @file
 * Control term visibility in node edit form.
 *
 * Use tac_lite to control which terms can be used when creating new
 * content.  Unlike tac_lite.module, which relies on Drupal's node_access
 * features, this module uses hook_form_alter to change which terms are
 * presented by the taxonomy module.
 */
use Drupal\Core\Form\FormStateInterface;
use Drupal\tac_lite\Form\SchemeForm;
use Drupal\taxonomy\Entity\Vocabulary;

/**
 * Implements hook_form_alter().
 */
function tac_lite_create_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  $build_info = $form_state
    ->getBuildInfo();
  $base_form = isset($build_info['base_form_id']) ? $build_info['base_form_id'] : NULL;
  if ($form_id == 'tac_lite_admin_scheme_form') {
    $config = $form['#tac_lite_config'];
    $scheme = isset($build_info['args'][0]) ? $build_info['args'][0] : NULL;
    if (!empty($form['tac_lite_config_scheme_' . $scheme])) {
      $form['tac_lite_config_scheme_' . $scheme]['tac_lite_create'] = [
        '#type' => 'checkbox',
        '#title' => 'Visibility on create and edit forms',
        '#default_value' => isset($config['tac_lite_create']) ? $config['tac_lite_create'] : FALSE,
        '#description' => t('Show terms when creating content.  This <strong>does not</strong> control which users can create a given content type. This <strong>does</strong> control which terms appear on the node edit forms.  <br/>Note that schemes granting <em>update</em> permission (above) imply <em>visibility on forms</em> as well.'),
      ];
    }
  }
  elseif ($base_form == 'node_form') {
    $account = \Drupal::currentUser();
    $widgets = [
      'select',
      'radios',
      'checkboxes',
    ];
    if (\Drupal::currentUser()
      ->hasPermission('administer tac_lite')) {
      return;
    }
    $settings = \Drupal::config('tac_lite.settings');
    $vids = $settings
      ->get('tac_lite_categories');
    $tids = $term_fields = [];
    $schemes = $settings
      ->get('tac_lite_schemes');
    for ($i = 1; $i <= $schemes; $i++) {
      $config = SchemeForm::tacLiteConfig($i);
      if (isset($config['tac_lite_create']) && $config['tac_lite_create'] || in_array('grant_update', $config['perms'])) {
        $tids = array_merge($tids, _tac_lite_user_tids($account, $i, $config));
      }
    }

    // Go through all of the fields in the system to find the ones we want use.
    $storage = $form_state
      ->getStorage();
    $form_display = $storage['form_display'] ?: NULL;
    $bundle = $form_display ? $form_display
      ->get('bundle') : NULL;
    $fields = \Drupal::service('entity_field.manager')
      ->getFieldDefinitions('node', $bundle);
    foreach ($fields as $field_name => $field) {
      $field_type = method_exists($field, 'getType') ? $field
        ->getType() : NULL;
      $target_type = method_exists($field, 'getSetting') ? $field
        ->getSetting('target_type') : NULL;

      // Get all terms, regardless of language, associated with the node.
      if ($field_type == 'entity_reference' && $target_type == 'taxonomy_term') {

        // Add an entry to our term_fields in the form of field
        // name => vocabulary machine name.
        $field_settings = $field
          ->getSettings();
        $vocabs = $field_settings['handler_settings']['target_bundles'];
        $term_fields[$field
          ->getName()] = reset($vocabs);
      }
    }

    // Now that we have the names of the fields,
    // go through each one in the form.
    foreach ($term_fields as $field_name => $vocab_name) {

      // Skip auto complete fields as they are not supported.
      if (isset($form[$field_name]['widget']['#type']) && in_array($form[$field_name]['widget']['#type'], $widgets)) {

        // Get the vocabulary info so we can get the vid.
        $v = Vocabulary::load($vocab_name);

        // We only want to act on this field if it is tied to a
        // vocabulary we are set to control.
        if (!in_array($v
          ->id(), $vids)) {
          continue;
        }

        // Go through each option for this field.
        foreach ($form[$field_name]['widget']['#options'] as $term_id => $term_name) {

          // Skip the "<none>" option (or anything like it).
          if (!is_numeric($term_id)) {
            continue;
          }

          // Is this option not in the list of terms this user can create with?
          if (!in_array($term_id, $tids)) {

            // The term is not the default value, and user is not
            // allowed to create with it.
            // HELP: What if it IS the default value? Do we not unset it?
            if ($term_id != $form[$field_name]['widget']['#default_value']) {

              // Unset the option to it doesn't appear.
              unset($form[$field_name]['widget']['#options'][$term_id]);
            }
          }
        }
      }
    }
  }
}

Functions

Name	Description
tac_lite_create_form_alter	Implements hook_form_alter().