vcgo.info

name = "VC Go"
version = 7.x-1.x-dev
description = "Detect old URL, redirect to the new path."
core = 7.x

vcgo.module

<?php
/**
 * @file vcgo.module
 * Detect old path request, redirect to new one.
 */

/**
 * Expressions to detect old pages, separator = ~~~ .
 * This configuration is for URLs like:
 *    ./Templates.asp?ID_CATEGORIE=871&ID_MESSAGE=1543&CAT_RAC=711
 *    ./article/123/article-title
 */
define('VCGO_REGEXS', '/.+ID_MESSAGE=(\d+).+/ ~~~ /.+\/article\/(\d+)\/.+/');

/**
 * On migrating, we save old content ID in a node field. We can put the name here.
 */
define('VCGO_FIELD_OLD_ID', 'field_old_id');

/**
 * Implements hook_menu().
 */
function vcgo_menu() {
  $items['vcgo_fetch/%'] = array(
    'title' => 'Fetch content from old site by ID',
    'access arguments' => array('access content'),
    'page callback' => 'vcgo_fetch_by_id_callback',
  );
  
  return $items;
}

/**
 * Implements hook_init().
 */
function vcgo_init() {
  $path = request_path();
  foreach (explode(' ~~~ ', VCGO_REGEXS) as $regex) {
    if ($old_id = vcgo_detect($regex, $path)) {
      drupal_goto("vcgo_fetch/{$old_id}");
      # vcgo_fetch_by_id_callback($old_id);
    }
  }
}

/**
 * Detect old Request, found node ID, redirect and exit the function.
 * If node is not found or unpublished, function just return the old ID value.
 */
function vcgo_detect($regex, $path) {
  // Find old ID in request path.
  $old_id = preg_replace($regex, '$1', $path);
  if (!is_numeric($old_id)) return FALSE;

  // Find Node ID by old ID
  $query = new EntityFieldQuery();
  $query->entityCondition('entity_type' , 'node');
  $query->fieldCondition(VCGO_FIELD_OLD_ID, 'value' , $old_id);
  if (!$entities = $query->execute()) return $old_id;

  // Load the node
  $entity = reset($entities['node']);
  if (!$entity->nid) return $old_id;
  if (!$node = node_load($entity->nid)) return $old_id;
  if (!$node->status) return $old_id;

  // Redirect to node page
  drupal_goto("node/{$node->nid}");
}

/**
 * @TODO: Function to fetch content by ID from old site.
 */
function vcgo_fetch_by_id_callback($old_id) {
  return '…';
}