<?php

/**
 * @file
 * The Node export module.
 *
 * Allows users to export nodes and then import them into another Drupal installation.
 */

/**
 * Implements hook_permission().
 */
function node_export_permission() {
  return array(
    'export nodes' => array(
      'title' => t('Export nodes'),
    ),
    'export own nodes' => array(
      'title' => t('Export own nodes'),
    ),
    'use PHP to import nodes' => array(
      'title' => t('Use PHP to import nodes'),
      'description' => t('Required for importing, but can allow execution of PHP.'),
      'restrict access' => TRUE,
    ),
  );
}

/**
 * Implements hook_menu().
 */
function node_export_menu() {
  $items['admin/config/content/node_export'] = array(
    'access arguments' => array('administer site configuration'),
    'page callback' => 'drupal_get_form',
    'page arguments' => array('node_export_settings'),
    'title' => 'Node export',
    'description' => 'Configure the settings for Node export.',
    'file' => 'node_export.pages.inc',
  );
  // Allow other modules to add local task tabs.
  $items['admin/config/content/node_export/settings'] = array(
      'title' => 'Settings',
      'type' => MENU_DEFAULT_LOCAL_TASK,
  );

  $selected_formats = variable_get('node_export_format', array('drupal' => 'drupal'));
  if (count(array_filter($selected_formats)) > 1) {
    $format_handlers = node_export_format_handlers();
    foreach ($format_handlers as $format_handler => $format) {
      if (!empty($selected_formats[$format_handler])) {
        $items['node/%node/node_export/' . $format_handler] = array(
          'access callback' => 'node_export_access_export',
          'access arguments' => array(1),
          'page callback' => 'node_export_gui',
          'page arguments' => array(1, $format_handler),
          'title' => 'Node export (' . $format['#title'] . ')',
          'weight' => 5,
          'type' => MENU_LOCAL_TASK,
          'context' => MENU_CONTEXT_PAGE | MENU_CONTEXT_INLINE,
          'file' => 'node_export.pages.inc',
        );
      }
    }
  }
  else {
    $items['node/%node/node_export'] = array(
      'access callback' => 'node_export_access_export',
      'access arguments' => array(1),
      'page callback' => 'node_export_gui',
      'page arguments' => array(1),
      'title' => 'Node export',
      'weight' => 5,
      'type' => MENU_LOCAL_TASK,
      'context' => MENU_CONTEXT_PAGE | MENU_CONTEXT_INLINE,
      'file' => 'node_export.pages.inc',
    );
  }
  $items['admin/content/node_export'] = array(
    'access arguments' => array('export nodes'),
    'page callback' => 'node_export_gui',
    'page arguments' => array(NULL, NULL),
    'title' => 'Node export',
    'type' => MENU_CALLBACK,
    'file' => 'node_export.pages.inc',
  );
  $items['node/add/node_export'] = array(
    'title' => 'Node export: import',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('node_export_import_form'),
    'access callback' => 'node_export_access_import',
    'description' => 'Import content using <em>Node export</em>.',
    'file' => 'node_export.pages.inc',
  );

  return $items;
}

/**
 * Check access to export a node.
 */
function node_export_access_export($node, $reset = FALSE) {
  global $user;
  if (is_numeric($node)) {
    $node = node_load($node, NULL, $reset);
  }

  if (function_exists('drush_main')) {
    // Always allow drush to export nodes.
    $access = TRUE;
  }
  else {
    // Check basic role permissions first.
    $access = (user_access('export nodes') || ($user->uid && ($node->uid == $user->uid) && user_access('export own nodes')));
    // Make sure the user can view the original node content.
    $access = $access && node_access('view', $node);
  }

  // Let other modules alter this - for example to only allow some users
  // to export specific nodes or types.
  drupal_alter("node_export_access_export", $access, $node);
  return $access;
}

/**
 * Check access to import a node.
 */
function node_export_access_import($node = NULL) {
  global $user;

  if (function_exists('drush_main')) {
    // Always allow drush to import nodes.
    $access = TRUE;
  }
  elseif (defined('MAINTENANCE_MODE') && MAINTENANCE_MODE == 'install') {
    // During the install phase $user is the Anonymous user; however, in
    // practice $user is performing tasks only granted to the admin user
    // (eg: installing modules, changing site settings).  For this reason
    // it seems sensible to allow this "Anonymous admin" user to import
    // any nodes they wish.
    $access = TRUE;
  }
  else {
    // Check basic role permissions first.
    $access = user_access('use PHP to import nodes');

    if (!is_null($node) && $access) {
      // Check node conditions.
      $access = node_access('create', $node->type);
    }
  }

  // Let other modules alter this - for example to only allow some users
  // to import specific nodes or types.
  drupal_alter("node_export_access_import", $access, $node);
  return $access;
}

/**
 * Check access to export an array of nodes.
 */
function node_export_access_export_nodes($nodes) {
  // Convert to array if it isn't already.
  if (is_object($nodes)) {
    $nodes = array($nodes);
  }
  foreach ($nodes as &$node) {
    if (!node_export_access_export($node)) {
      return FALSE;
    }
  }
  return TRUE;
}

/**
 * Check access to import an array of nodes.
 */
function node_export_access_import_nodes($nodes) {
  // Convert to array if it isn't already.
  if (is_object($nodes)) {
    $nodes = array($nodes);
  }
  foreach ($nodes as &$node) {
    if (!node_export_access_import($node)) {
      return FALSE;
    }
  }
  return TRUE;
}

/**
 * Implements hook_node_type_update().
 */
function node_export_node_type_update($info) {
  if (!empty($info->old_type) && $info->old_type != $info->type) {
    if (variable_get('node_export_reset_' . $info->old_type, FALSE)) {
      variable_del('node_export_reset_' . $info->old_type);
      variable_set('node_export_reset_' . $info->type, TRUE);
    }
  }
}

/**
 * Implements hook_node_type_delete().
 */
function node_export_node_type_delete($info) {
  variable_del('node_export_reset_' . $info->type);
}

/**
 * Implements hook_views_api().
 */
function node_export_views_api() {
  return array(
    'api' => 3,
    'path' => drupal_get_path('module', 'node_export') . '/views',
  );
}

/**
 * Implements hook_node_operations().
 */
function node_export_node_operations() {
  $operations = array();
  if (user_access('export nodes')) {

    $selected_formats = variable_get('node_export_format', array('drupal' => 'drupal'));
    if (count(array_filter($selected_formats)) > 1) {
      $format_handlers = node_export_format_handlers();
      foreach ($format_handlers as $format_handler => $format) {
        if ($selected_formats[$format_handler]) {
          $operations['node_export_' . $format_handler] = array(
            'label' => t('Node export') . " (" . $format['#title'] . ")",
            'callback' => 'node_export_bulk_operation',
            'callback arguments' => array('format' => $format_handler),
          );
        }
      }
    }
    else {
      $operations = array(
        'node_export' => array(
          'label' => t('Node export'),
          'callback' => 'node_export_bulk_operation',
        ),
      );
    }

  }
  return $operations;
}

/**
 * Callback for use with hook_node_operations().
 */
function node_export_bulk_operation($nodes = NULL, $format = NULL, $delivery = NULL) {
  module_load_include('inc', 'node_export', 'node_export.pages');
  return node_export_gui($nodes, $format, $delivery);
}

/**
 * Implements hook_action_info()
 */
function node_export_action_info() {
  $actions = array();

  $selected_formats = variable_get('node_export_format', array('drupal' => 'drupal'));
  $format_handlers = node_export_format_handlers();
  foreach ($format_handlers as $format_handler => $format) {
    if (in_array($format_handler, $selected_formats)) {
       // @todo: should formats be able to define their own actions?
       if (!empty($format['#file']) && is_file($format['#file'])) {
         require_once $format['#file'];
       }
       $format_action = 'node_export_' . $format_handler . '_action';
       if (function_exists($format_action . '_form')) {
         $actions[$format_action] = array(
           'type' => 'node',
           'label' => t('Node export') . " (" . $format['#title'] . ")",
           'behavior' => array('changes_property'),
           // This action only works when invoked through VBO. That's why it's
           // declared as non-configurable to prevent it from being shown in the
           // "Create an advanced action" dropdown on admin/config/system/actions.
           'configurable' => FALSE,
           'vbo_configurable' => TRUE,
           'triggers' => array('any'),
         );
      }
    }
  }

  return $actions;

}

/**
 * Export Nodes Action "Configuration" Form
 *
 * Technically for a normal action this is where you would provide config
 * for the actual execution of the action. However, we're hijacking it to
 * present the completed node_export_gui page.
 */
function node_export_action_form($context, &$form_state, $format = NULL) {
  // Get the name of the vbo views field
  $vbo = _views_bulk_operations_get_field($form_state['build_info']['args'][0]);

  // Adjust the selection in case the user chose 'select all'
  if (!empty($form_state['select_all_pages'])) {
    views_bulk_operations_direct_adjust($form_state['selection'], $vbo);
  }
  $nodes = array_combine($form_state['selection'], $form_state['selection']);
  return node_export_bulk_operation($nodes, $format);
}

/**
 * Export nodes.
 *
 * @param $nids
 *   A node ID or array of node IDs to export.
 * @param $format
 *   The format to use for export.
 * @param $msg_t
 *   Function used to translate.
 * @param $reset
 *   Whether to reset the node_load_multiple cache.
 * @return
 *   An array with keys 'success' which is a boolean value representing whether
 *   the export was successful and 'output' which contains the code string or an
 *   array of translated error messages to be shown to the user.
 */
function node_export($nids, $format = NULL, $msg_t = 't', $reset = FALSE) {
  global $user;

  // Make $nids an array if it isn't.
  if (is_int($nids)) {
    $nids = array($nids);
  }
  elseif (is_object($nids)) {
    $nids = array($nids->nid);
  }

  $nodes = array();
  foreach ($nids as $nid) {
    $original_node = node_load($nid, NULL, $reset);

    if (!node_export_access_export($original_node, $reset)) {
      // Halt exporting.
      $error = $msg_t("You do not have permission to perform a Node export on one or more of these nodes.  No nodes exported.");
      return array(
        'success' => FALSE,
        'output' => array($error),
      );
    }

    $node = node_export_prepare_node($original_node);

    $nodes[] = $node;
  }

  // Get the node code from the format handler
  $format_handlers = node_export_format_handlers();
  $node_export_format = variable_get('node_export_format', array('drupal' => 'drupal'));
  $format_handler = $format ? $format : reset($node_export_format);
  if (!isset($format_handlers[$format_handler])) {
    $format_handler = 'drupal';
  }

  // Let other modules do special fixing up.
  drupal_alter('node_export', $nodes, $format_handler);

  // If any nodes are set to FALSE, then an error was triggered in another module.
  // Currently modules doing this should also leave a watchdog warning.
  if (in_array(FALSE, $nodes)) {
    // Halt exporting.
    $error = $msg_t('An error occurred when processing nodes, please check your logs.  No nodes exported.');
    return array(
      'success' => FALSE,
      'output' => array($error),
    );
  }

  if (!empty($format_handlers[$format_handler]['#file']) && is_file($format_handlers[$format_handler]['#file'])) {
    require_once $format_handlers[$format_handler]['#file'];
  }

  $code_string = call_user_func(
    $format_handlers[$format_handler]['#export_callback'],
    $nodes,
    $format_handler
  );

  // Let modules modify the node code.
  drupal_alter('node_export_encode', $code_string, $nodes, $format_handler);

  return array(
    'success' => TRUE,
    'output' => $code_string,
    'format' => $format_handler,
  );

}

/**
 * Prepare a single node during export.
 */
function node_export_prepare_node(&$original_node) {
  // Create UUID if it's not there.
  if (!uuid_get_uuid('node', 'nid', $original_node->nid)) {
    $original_node->uuid = uuid_set_uuid('node', 'nid', $original_node->nid);
    // Save it so future node exports are consistent.
    node_save($original_node);
  }

  $node = clone($original_node);

  // Fix taxonomy array
  if (isset($node->taxonomy) && count($node->taxonomy)) {
    $vocabularies = taxonomy_get_vocabularies();
    $new_taxonomy = array();
    foreach ($node->taxonomy as $term) {
      // Free-tagging vocabularies need a different format
      if ($vocabularies[$term->vid]->tags) {
        $new_taxonomy['tags'][$term->vid][] = $term->name;
      }
      else {
        $new_taxonomy[$term->vid][$term->tid] = $term->tid;
      }
    }
    if (isset($new_taxonomy['tags']) && count($new_taxonomy['tags'])) {
      // Comma separate the tags
      foreach ($new_taxonomy['tags'] as $vid => $tags) {
        $new_taxonomy['tags'][$vid] = implode(', ', $tags);
      }
    }
    $node->taxonomy = $new_taxonomy;
  }

  // Attach path to the node.  Drupal doesn't attach this anymore for
  // performance reasons http://drupal.org/node/332333#comment-2163634.
  $node->path = path_load(array('source' => 'node/' . $node->nid));

  // Fix menu array
  $node->menu = node_export_get_menu($original_node);

  // Remove recursion from the object.
  $node = node_export_remove_recursion($node);

  // Add a parameter to identify this node as coming from D7, might be useful some day.
  $node->node_export_drupal_version = '7';

  // Export file fields.
  node_export_file_field_export($node, $original_node);

  // Let other modules do special fixing up.
  drupal_alter('node_export_node', $node, $original_node);

  return $node;
}

/**
 *  Check if all types in the import exist.
 *
 *  @return
 *    TRUE if all types exist, otherwise an array of missing type names.
 */
function node_export_import_types_check($nodes) {
  $missing_types = array();
  foreach ($nodes as $node) {
    if (node_type_get_name($node) == FALSE) {
      $missing_types[$node->type] = $node->type;
    }
  }
  return (!empty($missing_types) ? $missing_types : TRUE);
}

/**
 * Import Function
 *
 * @param $code_string
 *   The string of export code.
 * @param $msg_t
 *   Function used to translate.
 * @param $save
 *   When TRUE will save the nodes that are imported.
 * @return
 *   An array with keys 'success' which is a boolean value representing whether
 *   the import was successful and 'output' which contains an array of
 *   translated strings to be shown to the user as messages.
 */
function node_export_import($code_string, $msg_t = 't', $save = TRUE) {
  // Early check to avoid letting hooligans and the elderly pass data to the
  // eval() function call.
  if (!node_export_access_import()) {
    $error = $msg_t(
      'You do not have permission to import any nodes.'
    );
    return array(
      'success' => FALSE,
      'output' => array($error),
    );
  }

  // Allow modules to manipulate the $code_string.
  drupal_alter('node_export_decode', $code_string);

  // Pass the string to each format handler until one returns something useful.
  $format_handlers = node_export_format_handlers();
  $nodes = array();
  $used_format = "";
  foreach ($format_handlers as $format_handler => $format) {

    if (!empty($format['#file']) && is_file($format['#file'])) {
      require_once $format['#file'];
    }

    $nodes = call_user_func(
      $format['#import_callback'],
      $code_string
    );

    if (!empty($nodes)) {
      $used_format = $format_handler;
      break;
    }
  }

  if (isset($nodes['success']) && !$nodes['success']) {
    // Instead of returning nodes, the format handler returned an error array.
    // Translate the errors and return them.
    foreach ($nodes['output'] as $key => $output) {
      $nodes['output'][$key] = $msg_t($output);
    }
    return array(
      'success' => FALSE,
      'output' => $nodes['output'],
    );
  }

  if ($used_format == "") {
    $error = $msg_t(
      'Node export was unable to recognize the format of the supplied code.  No nodes imported.'
    );
    return array(
      'success' => FALSE,
      'output' => array($error),
    );
  }

  $nodes = node_export_restore_recursion($nodes);

  $types_exist = node_export_import_types_check($nodes);
  if ($types_exist !== TRUE) {
    // There was a problem with the content types check.
    $error = $msg_t(
      'Error encountered during import.  Node types unknown on this site: %t.  No nodes imported.',
      array('%t' => implode(", ", $types_exist))
    );
    return array(
      'success' => FALSE,
      'output' => array($error),
    );
  }

  if (!node_export_access_import_nodes($nodes)) {
    // There was a problem with permissions.
    $error = $msg_t(
      'You do not have permission to perform a Node export: import on one or more of these nodes.  No nodes imported.'
    );
    return array(
      'success' => FALSE,
      'output' => array($error),
    );
  }

  $count = 0;
  $total = count($nodes);
  // Let other modules do special fixing up.
  drupal_alter('node_export_import', $nodes, $used_format, $save);
  $new_nodes = array();
  $messages = array();
  foreach ($nodes as $original_node) {
    $node = node_export_node_clone($original_node);
    $tnid_to_reset = node_export_node_clone_set_tnid($node, $original_node);

    // Import file fields.
    node_export_file_field_import($node, $original_node);

    // Handle existing nodes.
    $save_node = $save;
    $nids = entity_get_id_by_uuid('node', array($node->uuid));
    if (!empty($nids[$node->uuid])) {
      $existing = variable_get('node_export_existing', 'new');
      switch ($existing) {
        case 'new':
          $node->is_new = TRUE;
          unset($node->uuid);
          break;
        case 'revision':
          $node->nid = $nids[$node->uuid];
          $node->is_new = FALSE;
          $node->revision = 1;
          $tnid_to_reset = 0;
          break;
        case 'skip':
          $save_node = FALSE;
          break;
      }
    }

    // Let other modules do special fixing up.
    drupal_alter('node_export_node_import', $node, $original_node, $save_node);

    if ($save_node) {
      if (!empty($tnid_to_reset) && empty($node->tnid)) {
        node_export_save($node);
        $node->tnid = $node->nid;

        // Update the tnid map for other nodes referencing this tnid.
        $tnid_map = &drupal_static('node_export_import_tnid_map', array());
        $tnid_map[$tnid_to_reset] = $node->tnid;
      }

      node_export_save($node);
      $new_nodes[$node->nid] = $node;
      $messages[] = $msg_t("Imported node !nid: !node", array('!nid' => $node->nid, '!node' => l($node->title, 'node/' . $node->nid)));
      $count++;
    }
    else {
      $new_nodes[] = $node;
    }
  }

  if ($count) {
    drupal_alter('node_export_after_import', $new_nodes, $used_format, $save);
    $messages[] = $msg_t("!count of !total nodes were imported.  Some values may have been reset depending on Node export's configuration.", array('!total' => $total, '!count' => $count));

    // Clear the page and block caches.
    cache_clear_all();

    // Nodes were saved, so return the nids.
    return array(
      'success' => TRUE,
      'output' => $messages,
      'nids' => array_keys($new_nodes),
      'format' => $used_format,
    );
  }
  else {
    // We didn't save, so return full nodes.
    return array(
      'success' => TRUE,
      'output' => $messages,
      'nodes' => $new_nodes,
      'format' => $used_format,
    );
  }

}


/**
 * Save a node object into the database.
 *
 * $node->changed is not forced like in node_save().
 *
 * A modified version of node_save().
 */
function node_export_save(&$node) {
  $transaction = db_transaction();

  try {
    // Load the stored entity, if any.
    if (!empty($node->nid) && !isset($node->original)) {
      $node->original = entity_load_unchanged('node', $node->nid);
    }

    field_attach_presave('node', $node);
    global $user;

    // Determine if we will be inserting a new node.
    if (!isset($node->is_new)) {
      $node->is_new = empty($node->nid);
    }

    // Set the timestamp fields.
    if (empty($node->created)) {
      $node->created = REQUEST_TIME;
    }

    // The update of the changed value is forced in the original node_save().
    if (empty($node->changed)) {
      $node->changed = REQUEST_TIME;
    }

    $node->timestamp = REQUEST_TIME;
    $update_node = TRUE;

    // Let modules modify the node before it is saved to the database.
    module_invoke_all('node_presave', $node);
    module_invoke_all('entity_presave', $node, 'node');

    if ($node->is_new || !empty($node->revision)) {
      // When inserting either a new node or a new node revision, $node->log
      // must be set because {node_revision}.log is a text column and therefore
      // cannot have a default value. However, it might not be set at this
      // point (for example, if the user submitting a node form does not have
      // permission to create revisions), so we ensure that it is at least an
      // empty string in that case.
      // @todo: Make the {node_revision}.log column nullable so that we can
      // remove this check.
      if (!isset($node->log)) {
        $node->log = '';
      }
    }
    elseif (empty($node->log)) {
      // If we are updating an existing node without adding a new revision, we
      // need to make sure $node->log is unset whenever it is empty. As long as
      // $node->log is unset, drupal_write_record() will not attempt to update
      // the existing database column when re-saving the revision; therefore,
      // this code allows us to avoid clobbering an existing log entry with an
      // empty one.
      unset($node->log);
    }

    // When saving a new node revision, unset any existing $node->vid so as to
    // ensure that a new revision will actually be created, then store the old
    // revision ID in a separate property for use by node hook implementations.
    if (!$node->is_new && !empty($node->revision) && $node->vid) {
      $node->old_vid = $node->vid;
      unset($node->vid);
    }

    // Save the node and node revision.
    if ($node->is_new) {
      // For new nodes, save new records for both the node itself and the node
      // revision.
      drupal_write_record('node', $node);
      _node_save_revision($node, $user->uid);
      $op = 'insert';
    }
    else {
      // For existing nodes, update the node record which matches the value of
      // $node->nid.
      drupal_write_record('node', $node, 'nid');
      // Then, if a new node revision was requested, save a new record for
      // that; otherwise, update the node revision record which matches the
      // value of $node->vid.
      if (!empty($node->revision)) {
        _node_save_revision($node, $user->uid);
      }
      else {
        _node_save_revision($node, $user->uid, 'vid');
        $update_node = FALSE;
      }
      $op = 'update';
    }
    if ($update_node) {
      db_update('node')
        ->fields(array('vid' => $node->vid))
        ->condition('nid', $node->nid)
        ->execute();
    }

    // Call the node specific callback (if any). This can be
    // node_invoke($node, 'insert') or
    // node_invoke($node, 'update').
    node_invoke($node, $op);

    // Save fields.
    $function = "field_attach_$op";
    $function('node', $node);

    module_invoke_all('node_' . $op, $node);
    module_invoke_all('entity_' . $op, $node, 'node');

    // Update the node access table for this node. There's no need to delete
    // existing records if the node is new.
    $delete = $op == 'update';
    node_access_acquire_grants($node, $delete);

    // Clear internal properties.
    unset($node->is_new);
    unset($node->original);
    // Clear the static loading cache.
    entity_get_controller('node')->resetCache(array($node->nid));

    // Ignore slave server temporarily to give time for the
    // saved node to be propagated to the slave.
    db_ignore_slave();
  }
  catch (Exception $e) {
    $transaction->rollback();
    watchdog_exception('node', $e);
    throw $e;
  }
}

/**
 * Prepare a clone of the node during import.
 */
function node_export_node_clone($original_node) {
  global $user;

  $node = clone($original_node);

  $node->nid = NULL;
  $node->vid = NULL;

  if (variable_get('node_export_reset_author_' . $node->type, TRUE)) {
    $node->name = !empty($user->name) ? $user->name : (!empty($user->uid) ? NULL : variable_get('anonymous', t('Anonymous')));
    $node->uid = $user->uid;
    $node->revision_uid = $user->uid;
  }

  // note: a uid of 0 is erroneous in any case, reset it to 1 (admin user)
  if ($node->revision_uid == 0) {
    $node->revision_uid = 1;
  }

  if (variable_get('node_export_reset_created_' . $node->type, TRUE)) {
    $node->created = NULL;
  }

  if (variable_get('node_export_reset_changed_' . $node->type, TRUE)) {
    $node->changed = NULL;
  }

  if (variable_get('node_export_reset_revision_timestamp_'. $node->type, TRUE)) {
    $node->revision_timestamp = NULL;
  }

  if (variable_get('node_export_reset_last_comment_timestamp_'. $node->type, TRUE)) {
    $node->last_comment_timestamp = NULL;
  }

  if (variable_get('node_export_reset_menu_' . $node->type, TRUE)) {
    $node->menu = NULL;
  }

  if (variable_get('node_export_reset_path_' . $node->type, TRUE)) {
    $node->path = NULL;
  }
  else {
    if (is_array($node->path) && isset($node->path['pid'])) {
      unset($node->path['pid']);
    }
    if (module_exists('pathauto')) {
      // Prevent pathauto from creating a new path alias.
      $node->path['pathauto'] = FALSE;
    }
  }

  if (variable_get('node_export_reset_book_mlid_' . $node->type, TRUE) && isset($node->book['mlid'])) {
    $node->book['mlid'] = NULL;
  }

  // @todo - is this still needed?
  $node->files = array();

  if (variable_get('node_export_reset_status_' . $node->type, FALSE)) {
    $node->status = FALSE;
  }

  if (variable_get('node_export_reset_promote_' . $node->type, FALSE)) {
    $node->promote = FALSE;
  }

  if (variable_get('node_export_reset_sticky_' . $node->type, FALSE)) {
    $node->sticky = FALSE;
  }

  // check for a data casting error
  if ($node->data == 'b:0;') { // data has been serialized as a FALSE instead of NULL
    $node->data = NULL;
  }

  // sort the node keys, so that there is a consistent representation for
  // (drupal_)var_export
  $array_node = (array) $node;
  ksort( $array_node);
  $node = (object) $array_node;

  return $node;

}

/**
 * Update the tnid value on the new node based on the tnid value from the old node.
 *
 * If the original node has a tnid that matches its nid, then we can deduce that this
 * tnid needs to be changed to match the node's nid (which will only be set after
 * first saving the node).
 *
 * If the original node has a tnid that does not match its nid, we first check to see
 * if we have already updated the tnid on another node that had this tnid originally.
 * If so, we will use that tnid.  Otherwise, we leave the tnid specified in the import
 * unchanged.
 *
 * As such, when importing a set of nodes that are all linked via tnid, it is necessary
 * that the first node where nid = tnid is imported prior to any of the other nodes
 * that share that tnid.
 *
 * @return number
 *   original tnid if the tnid on this node needs to be set equal to the node's nid
 *   when it is saved, otherwise NULL
 */
function node_export_node_clone_set_tnid(&$node, $original_node) {
  if (!empty($original_node->tnid)) {
    $tnid_map = drupal_static('node_export_import_tnid_map', array());
    if (!empty($tnid_map[$original_node->tnid])) {
      $node->tnid = $tnid_map[$original_node->tnid];
    }
    elseif (!empty($original_node->nid) && $original_node->tnid == $original_node->nid) {
      $node->tnid = 0;
      return $original_node->tnid;
    }
  }
  return NULL;
}

/**
 * Implements hook_node_export_alter().
 * In case when node translation is enabled we have to ensure that original nodes
 * appear in export before their translations. This is done to properly assign tnid
 * to translations, because we don't know until the first node in the set is saved.
 */
function node_export_node_export_alter(&$nodes, $format_handler) {
  if (module_exists('translation')) {
    $source_nodes = array();
    foreach ($nodes as $i => $node) {
      if ($node->nid == $node->tnid) {
        $source_nodes[] = $node;
        unset($nodes[$i]);
      }
    }
    if ($source_nodes) {
      $nodes = array_merge($source_nodes, $nodes);
    }
  }
}

/**
 * Create a new menu entry with title, parent and weight exported from
 * another nodes menu. Returns NULL if the node has no menu title.
 */
function node_export_get_menu($node) {

  // This will fetch the existing menu item if the node had one.
  module_invoke_all('node_prepare', $node);

  $type = $node->type;

  // Only keep the values we care about.
  if (!empty($node->menu['mlid'])) {

    // Store a copy of the old menu
    $old_menu = $node->menu;

    // Now fetch the defaults for a new menu entry.
    $node = new stdClass;
    $node->type = $type;
    //module_invoke_all('node_prepare', $node);

    node_object_prepare($node);

    // Make a list of values to attempt to copy.
    $menu_fields = array(
      'link_title',
      'plid',
      'menu_name',
      'weight',
      'hidden',
      'expanded',
      'has_children',
    );

    // Copy those fields from the old menu over the new menu defaults.
    foreach ($menu_fields as $menu_field) {
      $node->menu[$menu_field] = $old_menu[$menu_field];
    }

    // Copy the menu description from the old menu.
    // Issue #1287300.
    if (isset($old_menu['options']['attributes']['title'])) {
      $node->menu['description'] = $old_menu['options']['attributes']['title'];
    }
    else {
      $node->menu['description'] = '';
    }

    // Ensure menu will be created during node import.
    // Issue #1139120.
    $node->menu['enabled'] = 1;

    // Return the menu.
    return $node->menu;
  }

}

/**
 * Remove recursion problem from an object or array.
 */
function node_export_remove_recursion($o) {
  static $replace;
  if (!isset($replace)) {
    $replace = create_function(
      '$m',
      '$r="\x00{$m[1]}ecursion_export_node_";return \'s:\'.strlen($r.$m[2]).\':"\'.$r.$m[2].\'";\';'
    );
  }
  if (is_array($o) || is_object($o)) {
    $re = '#(r|R):([0-9]+);#';
    $serialize = serialize($o);
    if (preg_match($re, $serialize)) {
      $last = $pos = 0;
      while (false !== ($pos = strpos($serialize, 's:', $pos))) {
        $chunk = substr($serialize, $last, $pos - $last);
        if (preg_match($re, $chunk)) {
          $length = strlen($chunk);
          $chunk = preg_replace_callback($re, $replace, $chunk);
          $serialize = substr($serialize, 0, $last) . $chunk . substr($serialize, $last + ($pos - $last));
          $pos += strlen($chunk) - $length;
        }
        $pos += 2;
        $last = strpos($serialize, ':', $pos);
        $length = substr($serialize, $pos, $last - $pos);
        $last += 4 + $length;
        $pos = $last;
      }
      $serialize = substr($serialize, 0, $last) . preg_replace_callback($re, $replace, substr($serialize, $last));
      $o = unserialize($serialize);
    }
  }
  return $o;
}

/**
 * Restore recursion to an object or array.
 */
function node_export_restore_recursion($o) {
  return unserialize(
    preg_replace(
      '#s:[0-9]+:"\x00(r|R)ecursion_export_node_([0-9]+)";#',
      '\1:\2;',
      serialize($o)
    )
  );
}

/**
 * Get a list of possible format handlers (other than the default).
 *
 * @return
 *   An array of format handlers from hook implementations.
 * @see hook_node_export_format_handlers()
 */
function node_export_format_handlers() {
  module_load_include('inc', 'node_export', 'node_export.formats');
  $format_handlers = &drupal_static(__FUNCTION__);
  if (empty($format_handlers)) {
    $format_handlers = module_invoke_all('node_export_format_handlers');
  }
  drupal_alter('node_export_format_handlers', $format_handlers);
  return $format_handlers;
}

/**
 * Get entity type and bundle of the given entity. Works for nodes and field
 * collection items.
 * 
 * @param $entity
 *   Entity to get information of.
 * 
 * @return
 *   Associative array with the 'type' and 'bundle' fields.
 */
function _node_export_entity_info($entity) {
  $info = array();

  if (method_exists($entity, 'entityType')
      && $entity->entityType() == 'field_collection_item') {
    $info['type'] = $entity->entityType();

    // Field the collection is attached to.
    $info['bundle'] = $entity->field_name;
  }
  else {
    $info['type'] = 'node';
    $info['bundle'] = $entity->type;
  }

  return $info;
}

/**
 * Handle exporting file fields.
 * 
 * @param $entity
 *   Node or field_collection_item object.
 * @param $original_entity
 *   Unused...
 */
function node_export_file_field_export(&$entity, $original_entity) {
  $entity_info = _node_export_entity_info($entity);

  $types = array_filter(variable_get('node_export_file_types', array()));
  if ($entity_info['type'] != 'node' || in_array($entity->type, $types)) {
    $assets_path = variable_get('node_export_file_assets_path', '');
    $export_mode = variable_get('node_export_file_mode', 'inline');

    switch ($export_mode) {
      case 'local':
        $export_var = 'node_export_file_path';
        break;
      case 'remote':
        $export_var = 'node_export_file_url';
        break;
      default:
      case 'inline':
        $export_var = 'node_export_file_data';
        break;
    }

    // If files are supposed to be copied to the assets path.
    if ($export_mode == 'local' && $assets_path) {
      // Ensure the assets path is created
      if (!is_dir($assets_path) && mkdir($assets_path, 0777, TRUE) == FALSE) {
        drupal_set_message(t("Could not create assets path! '!path'", array('!path' => $assets_path)), 'error');
        // Don't continue if the assets path is not ready
        return;
      }

      // Ensure it is writable
      if (!is_writable($assets_path)) {
        drupal_set_message(t("Assets path is not writable! '!path'", array('!path' => $assets_path)), 'error');
        // Don't continue if the assets path is not ready
        return;
      }
    }

    // get all fields from this node type
    $fields = field_info_instances($entity_info['type'],
      $entity_info['bundle']);
    foreach($fields as $field_instance) {
      // load field infos to check the type
      $field = &$entity->{$field_instance['field_name']};
      $info = field_info_field($field_instance['field_name']);

      $supported_fields = array_map('trim', explode(',', variable_get('node_export_file_supported_fields', 'file, image')));

      // check if this field should implement file import/export system
      if (in_array($info['type'], $supported_fields)) {

        // we need to loop into each language because i18n translation can build
        // fields with different language than the node one.
        foreach($field as $language => $files) {
          if (is_array($files)) {
            foreach($files as $i => $file) {

              // convert file to array to stay into the default node_export_file format
              $file = (object) $file;

              // media field type doesn't load file the whole file on node_load
              // it loads only fid, title and data associated with file, so in this case we need
              // to load it by ourselves.
              if (empty($file->uri) && !empty($file->fid) && $file = file_load($file->fid)) {
                $field[$language][$i] = (array) $file;
              }

              // Check the file
              if (!isset($file->uri) || !is_file($file->uri)) {
                drupal_set_message(t("File field found on node, but file doesn't exist on disk? '!path'", array('!path' => $file->uri)), 'error');
                continue;
              }

              if ($export_mode == 'local') {
                if ($assets_path) {
                  $export_data = $assets_path . '/' . basename($file->uri);
                  if (!copy($file->uri, $export_data)) {
                    drupal_set_message(t("Export file error, could not copy '%filepath' to '%exportpath'.", array('%filepath' => $file->uri, '%exportpath' => $export_data)), 'error');
                    return FALSE;
                  }
                }
                else {
                  $export_data = $file->uri;
                }
              }
              // Remote export mode
              elseif ($export_mode == 'remote') {
                // NOTE: This is patched with info from https://drupal.org/node/2046431
                $export_data = file_create_url($file->uri);
              }
              // Default is 'inline' export mode
              else {
                $export_data = base64_encode(file_get_contents($file->uri));
              }

              // build the field again, and remove fid to be sure that imported node
              // will rebuild the file again, or keep an existing one with a different fid
              $field[$language][$i]['fid'] = NULL;
              $field[$language][$i][$export_var] = $export_data;

            }
          }
        }
      }
    }
  }
}

/**
 * Handle importing file fields.
 * 
 * @param $entity
 *   Node or field_collection_item object.
 * @param $original_entity
 *   Unused...
 */
function node_export_file_field_import(&$entity, $original_entity) {
  $entity_info = _node_export_entity_info($entity);

  // Get all fields from this node type.
  $fields = field_info_instances($entity_info['type'], $entity_info['bundle']);
  foreach($fields as $field_instance) {
    // Load field info to check the type.
    $field = &$entity->{$field_instance['field_name']};
    $info = field_info_field($field_instance['field_name']);

    $supported_fields = array_map('trim', explode(',', variable_get('node_export_file_supported_fields', 'file, image')));

    // Check if this field should implement file import/export system.
    if (in_array($info['type'], $supported_fields)) {

      // We need to loop into each language because i18n translation can build
      // fields with different language than the node one.
      foreach($field as $language => $files) {
        if (is_array($files)) {
          foreach($files as $i => $field_value) {

            $file = (object) $field_value;

            $result = _node_export_file_field_import_file($file);

            // The file was saved successfully, update the file field (by reference).
            if ($result == TRUE && isset($file->fid)) {
              // Retain any special properties from the original field value.
              $field[$language][$i] = array_merge($field_value, (array) $file);
            }
          }
        }
      }
    }
  }
}

/**
 * Detects remote and local file exports and imports accordingly.
 *
 * @param &$file
 *   The file, passed by reference.
 * @return TRUE or FALSE
 *   Depending on success or failure.  On success the $file object will
 *   have a valid $file->fid attribute.
 */
function _node_export_file_field_import_file(&$file) {
  // This is here for historical reasons to support older exports.  It can be
  // removed in the next major version.
  $file->uri = strtr($file->uri, array('#FILES_DIRECTORY_PATH#' => 'public:/'));

  // The file is already in the right location AND either the
  // node_export_file_path is not set or the node_export_file_path and filepath
  // contain the same file
  if (is_file($file->uri) &&
    (
      (!isset($file->node_export_file_path) || !is_file($file->node_export_file_path)) ||
      (
        is_file($file->node_export_file_path) &&
        filesize($file->uri) == filesize($file->node_export_file_path) &&
        strtoupper(dechex(crc32(file_get_contents($file->uri)))) ==
          strtoupper(dechex(crc32(file_get_contents($file->node_export_file_path))))
      )
    )
  ) {
    // Keep existing file if it exists already at this uri (see also #1023254)
    // Issue #1058750.
    $query = db_select('file_managed', 'f')
        ->fields('f', array('fid'))
        ->condition('uri', $file->uri)
        ->execute()
        ->fetchCol();

    if (!empty($query)) {
      watchdog('node_export', 'kept existing managed file at uri "%uri"', array('%uri' => $file->uri), WATCHDOG_NOTICE);
      $file = file_load(array_shift($query));
    } elseif(isset($file->fid)) {
      unset($file->fid);
      $file = (object) array_merge((array) $file, (array) file_load(array_shift($query)));
    }

    $file = file_save($file);
  }
  elseif (isset($file->node_export_file_data)) {
    $directory = drupal_dirname($file->uri);
    if (file_prepare_directory($directory, FILE_CREATE_DIRECTORY)) {
      if (file_put_contents($file->uri, base64_decode($file->node_export_file_data))) {
        $files = file_load_multiple(array(), array('uri' => $file->uri));

        // Only attempt to save the file if a record doesn't already exist in
        // the file_managed table.
        if (count($files) == 0) {
          $file = file_save($file);
        }
      }
    }
  }
  // The file is in a local location, move it to the
  // destination then finish the save
  elseif (isset($file->node_export_file_path) && is_file($file->node_export_file_path)) {
    $directory = drupal_dirname($file->uri);
    if (file_prepare_directory($directory, FILE_CREATE_DIRECTORY)) {
      // The $file->node_export_file_path is passed to reference, and modified
      // by file_unmanaged_copy().  Making a copy to avoid tainting the original.
      $node_export_file_path = $file->node_export_file_path;
      file_unmanaged_copy($node_export_file_path, $directory, FILE_EXISTS_REPLACE);

      // At this point the $file->node_export_file_path will contain the
      // destination of the copied file
      //$file->uri = $node_export_file_path;
      $file = file_save($file);
    }
  }
  // The file is in a remote location, attempt to download it
  elseif (isset($file->node_export_file_url)) {
    // Need time to do the download
    ini_set('max_execution_time', 900);

    $temp_path = file_directory_temp() . '/' . md5(mt_rand()) . '.txt';
    if (($source = fopen($file->node_export_file_url, 'r')) == FALSE) {
      drupal_set_message(t("Could not open '@file' for reading.", array('@file' => $file->node_export_file_url)));
      return FALSE;
    }
    elseif (($dest = fopen($temp_path, 'w')) == FALSE) {
      drupal_set_message(t("Could not open '@file' for writing.", array('@file' => $file->uri)));
      return FALSE;
    }
    else {
      // PHP5 specific, downloads the file and does buffering
      // automatically.
      $bytes_read = @stream_copy_to_stream($source, $dest);

      // Flush all buffers and wipe the file statistics cache
      @fflush($source);
      @fflush($dest);
      clearstatcache();

      if ($bytes_read != filesize($temp_path)) {
        drupal_set_message(t("Remote export '!url' could not be fully downloaded, '@file' to temporary location '!temp'.", array('!url' => $file->node_export_file_url, '@file' => $file->uri, '!temp' => $temp_path)));
        return FALSE;
      }
      // File was downloaded successfully!
      else {
        if (!@copy($temp_path, $file->uri)) {
          unlink($temp_path);
          drupal_set_message(t("Could not move temporary file '@temp' to '@file'.", array('@temp' => $temp_path, '@file' => $file->uri)));
          return FALSE;
        }

        unlink($temp_path);
        $file->filesize = filesize($file->uri);
        $file->filemime = file_get_mimetype($file->uri);
      }
    }

    fclose($source);
    fclose($dest);

    $file = file_save($file);
  }
  // Unknown error
  else {
    drupal_set_message(t("Unknown error occurred attempting to import file: @filepath", array('@filepath' => $file->uri)), 'error');
    return FALSE;
  }

  return TRUE;
}

// Remove once http://drupal.org/node/858274 is resolved.
if (!function_exists('uuid_set_uuid')) {
  /**
   * API function to set the UUID of an object based on its serial ID.
   *
   * @param $table
   *   Base table of the object. Currently, one of node, revision_revisions,
   *   users, vocabulary or term_data.
   * @param $key
   *   The name of the serial ID column.
   * @param $serial_id
   *   The serial ID of the object.
   * @param $uuid
   *   Optional UUID.  If omitted, a UUID will be generated.
   * @return
   *   The UUID on success, FALSE if the uuid provided is not valid.
   */
  function uuid_set_uuid($table, $key, $serial_id, $uuid = FALSE) {
    if (empty($uuid)) {
      $uuid = uuid_generate();
    }

    if (!uuid_is_valid($uuid)) {
      return FALSE;
    }

    $query = db_update($table)
      ->fields(array('uuid' => $uuid))
      ->condition($key, $serial_id, '=')
      ->execute();


    return $uuid;
  }
}

// Remove once http://drupal.org/node/858274 is resolved.
if (!function_exists('uuid_get_uuid')) {
  /**
   * API function to get the UUID of an object based on its serial ID.
   *
   * @param $entity_type
   *   The entity type.
   * @param $key
   *   The name of the serial ID column.
   * @param $id
   *   The serial ID of the object.
   * @return
   *   The UUID of the object, or FALSE if not found.
   */
  function uuid_get_uuid($entity_type, $key, $id) {
    $supported = uuid_get_core_entity_info();
    if (!isset($supported[$entity_type])) {
      return FALSE;
    }
    $entity_info = entity_get_info($entity_type);
    $table = $entity_info['base table'];
    return db_query("SELECT uuid FROM {" . $table . "} WHERE " . $key . " = :id", array(':id' => $id))->fetchField();
  }
}