function nopremium_file_download in Node Option Premium 7

Implementation of hook_file_download().

@todo use hook_file_download_access_alter() instead once file_file_download() is fixed. See http://drupal.org/node/1245220.

File

./nopremium.module, line 255

Written by Henri MEDOT <henri.medot[AT]absyx[DOT]fr> http://www.absyx.fr

Code

function nopremium_file_download($uri, $field_type = 'file') {
  global $user;

  // Get the file record based on the URI. If not in the database just return.
  $files = file_load_multiple(array(), array(
    'uri' => $uri,
  ));
  if (count($files)) {
    foreach ($files as $item) {

      // Since some database servers sometimes use a case-insensitive comparison
      // by default, double check that the filename is an exact match.
      if ($item->uri === $uri) {
        $file = $item;
        break;
      }
    }
  }
  if (!isset($file)) {
    return;
  }

  // Find out which (if any) fields of this type contain the file.
  $references = file_get_file_references($file, NULL, FIELD_LOAD_CURRENT, $field_type);

  // Stop processing if there are no references in order to avoid returning
  // headers for files controlled by other modules. Make an exception for
  // temporary files where the host entity has not yet been saved (for example,
  // an image preview on a node/add form) in which case, allow download by the
  // file's owner.
  if (empty($references) && ($file->status == FILE_STATUS_PERMANENT || $file->uid != $user->uid)) {
    return;
  }

  // Loop through all references of this file. If a reference explicitly denies
  // access to the field to which this file belongs, according to
  // nopremium_access_full_content, no further checks are done and download
  // access is denied.
  foreach ($references as $field_name => $field_references) {
    if (!empty($field_references['node'])) {
      foreach ($field_references['node'] as $id => $reference) {

        // Try to load $entity and $field.
        $entity = entity_load('node', array(
          $id,
        ));
        $entity = reset($entity);
        $field = field_info_field($field_name);

        // Load the field item that references the file if $entity is premium.
        if ($entity && $entity->premium) {

          // Load all field items for that entity.
          $field_items = field_get_items('node', $entity, $field_name);

          // Find the field item with the matching URI.
          foreach ($field_items as $item) {
            if ($item['uri'] == $uri) {
              if (!nopremium_access_full_content($entity)) {
                return -1;
              }
              break;
            }
          }
        }
      }
    }
  }
}