function block_region_permissions_form_block_admin_display_form_alter in Block Region Permissions 8

Implements hook_form_FORM_ID_alter().

File

./block_region_permissions.module, line 17

Block region permissions module.

Code

function block_region_permissions_form_block_admin_display_form_alter(&$form, FormStateInterface $form_state, $form_id) {

  // Get theme name.
  $current_path = \Drupal::service('path.current')
    ->getPath();
  if ($current_path == '/admin/structure/block') {

    // Get default theme.
    $theme_key = \Drupal::config('system.theme')
      ->get('default');
  }
  else {

    // Get theme from path.
    $theme_key = str_replace('/admin/structure/block/list/', '', $current_path);
  }

  // Get block keys for each region.
  // Also get a master list of region select field options.
  $region_block_keys = [];
  $region_options = [];
  $block_elements = Element::children($form['blocks']);
  foreach ($block_elements as $block_key) {

    // Get region name.
    $region_key = '';
    if (substr($block_key, 0, 7) == 'region-') {

      // Region label or message.
      list(, $region_key, ) = explode('-', $block_key);
    }
    elseif ($block = Block::load($block_key)) {

      // Region block.
      $region_key = $block
        ->getRegion();

      // Save master list of options one time.
      if (empty($region_options)) {
        $region_options = $form['blocks'][$block_key]['region-theme']['region']['#options'];
      }
    }

    // Save region names with block keys.
    if (!empty($region_key)) {
      if ($region_key == -1) {
        $region_key = 'disabled';
      }
      $region_block_keys[$region_key][] = $block_key;
    }
  }

  // Remove blocks for regions the user cannot administer.
  foreach ($region_block_keys as $region_key => $block_keys) {
    if ($region_key != 'disabled') {
      if (!\Drupal::currentUser()
        ->hasPermission("administer {$theme_key} {$region_key}")) {

        // Remove block.
        foreach ($block_keys as $block_key) {
          unset($form['blocks'][$block_key]);
        }

        // Update tracking.
        unset($region_block_keys[$region_key]);
      }
    }
  }

  // Remove region select field options for regions the user cannot administer.
  if (!empty($region_block_keys)) {

    // Remove options from master list.
    foreach ($region_options as $region_key => $options) {
      if (!\Drupal::currentUser()
        ->hasPermission("administer {$theme_key} {$region_key}")) {
        unset($region_options[$region_key]);
      }
    }

    // Replace form block options with master list.
    foreach ($region_block_keys as $region_key => $block_keys) {
      foreach ($block_keys as $block_key) {
        if (isset($form['blocks'][$block_key]['region-theme']['region']['#options'])) {
          $form['blocks'][$block_key]['region-theme']['region']['#options'] = $region_options;
        }
      }
    }
  }
}