ting_null_covers.module

<?php
/**
 * @file
 * Module which allows control of how missing item covers are displayed.
 */

/**
 * Implements hook_menu().
 */
function ting_null_covers_menu() {
  $menu = array();

  $menu['admin/config/ting/covers/null'] = array(
    'title' => 'Empty covers',
    'description' => 'Configure how empty covers are displayed',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('ting_null_covers_admin_form'),
    'access arguments' => array('null covers display'),
    'file' => 'ting_null_covers.admin.inc',
    'type' => MENU_LOCAL_TASK,
  );

  return $menu;
}

/**
 * Implements hook_permission().
 */
function ting_null_covers_permission() {
  $perm = array();

  $perm['null covers display'] = array(
    'title' => t('Manage empty covers'),
    'description' => t('Control how the empty covers are displayed.'),
  );

  return $perm;
}

/**
 * Implements hook_entity_view().
 *
 * We cannot oversee if the item has a cover or not, so a request to cover
 * service is required here.
 */
function ting_null_covers_entity_view($entity, $entity_type, $view_mode, $langcode) {
  if (!variable_get('ting_null_covers_hide', FALSE)) {
    return;
  }
  elseif ($entity_type == 'ting_object' && ($view_mode == 'collection_list' || $view_mode == 'teaser')) {
    drupal_add_css(drupal_get_path('module', 'ting_null_covers') . '/css/ting_null_covers.styles.css', 'file');
    $localId = $entity->localId;
    $unset_image = FALSE;


    $path = ting_covers_object_path($localId);
    // In case when covers were requested earlier and were not found.
    if (cache_get('ting_covers:' . $localId)) {
      $unset_image = TRUE;
    }
    // In case when cover is missing, check if it actually is missing
    // at ADDI service.
    elseif (!file_exists($path)) {
      $service = new AdditionalInformationService(
        variable_get('addi_wsdl_url'),
        variable_get('addi_username'),
        variable_get('addi_group'),
        variable_get('addi_password')
      );

      $additional_informations = $service->getByFaustNumber($localId);
      $ai = $additional_informations[$localId];

      if (!$ai->detailUrl && !$ai->thumbnailUrl) {
        $unset_image = TRUE;
      }
    }

    if ($unset_image) {
      unset($entity->content['ting_cover']);
    }
  }
}