access_private.module

<?php
// $Id$

/**
 * @file
 * Combine the modules private (http://drupal.org/project/private) and
 * uuid (http://drupal.org/project/uuid) to allow access to private nodes by
 * using their uuid.
 */

/**
 * Implement hook_menu().
 * @return An array of menu items.
 */
function access_private_menu() {
  $items = array();

  // Create dynamic menu callback to collect uuid-calls.
  $items['private/%access_private'] = array(
    'title callback' => 'node_page_title',
    'title arguments' => array(1),
    'page callback' => 'node_page_view',
    'page arguments' => array(1),
    'access callback' => 'node_access',
    'access arguments' => array('view', 1),
  );

  return $items;
}

/**
 * Load a node object based on the given UUID.
 * @param $arg
 *   UUID of the node.
 * @return
 *   The loaded node or FALSE.
 */
function access_private_load($uuid) {
  if (uuid_is_valid($uuid)) {
    $node = node_get_by_revision_uuid($uuid);
    return $node === FALSE ? node_get_by_uuid($uuid) : $node;
  }
}

/**
 * Implement hook_node_grants().
 *
 * @param $account
 *   The user object whose grants are requested.
 * @param $op
 *   The node operation to be performed, such as "view", "update", or "delete".
 * @return
 *   An array whose keys are "realms" of grants such as "user" or "role", and
 *   whose values are linear lists of grant IDs.
 */
function access_private_node_grants($account, $op) {
  $grants = array();
  if ($op == 'view' && (arg(0) == 'private' && uuid_is_valid(arg(1)))) {
    // Grant direct access to private nodes if they are access by their UUID.
    $grants['private'] = array(1);
  }
  return $grants;
}

/**
 * Implement hook_link().
 */
function access_private_link($type, $object, $teaser = FALSE) {
  global $user;
  $links = array();
  if ($type == 'node' && isset($object->uuid)) {
    $links['access_private_link'] = array(
      'title' => t('direct link'),
      'description' => t('Use this link to share the node with other persons.'),
      'href' => "private/$object->uuid",
    );
  }
  return $links;
}