Vanilla 2 plugin to maintain Vanilla 1 links after the upgrade.

default.php

<?php if (!defined('APPLICATION')) exit();
/*
Copyright 2008, 2009 FoxyCart, LLC

This is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this file.  If not, see <http://www.gnu.org/licenses/>.
Contact Fred Alger at fred [dot] alger [at] foxycart [dot] com
*/


// Define the plugin:
$PluginInfo['MaintainVanilla1Links'] = array(
   'Name' => 'Maintain Vanilla 1 Links',
   'Description' => "Permanent redirects for old Vanilla 1 URLs",
   'Version' => '1',
   'Author' => "FoxyCart, LLC",
   'AuthorEmail' => 'fred.alger@foxycart.com',
   'AuthorUrl' => 'http://www.foxycart.com',
   'RegisterPermissions' => FALSE,
   'SettingsPermission' => FALSE
);

// Add this row to config.php:
// $Configuration['Routes']['comments.php'] = 'vanilla/discussion/oldcommentlink/';

class MaintainVanilla1LinksPlugin implements Gdn_IPlugin {
   public function DiscussionController_OldCommentLink_Create(&$Sender) {
      // $Sender doesn't have anything that lets me fetch the raw query string, so back to plain ol' PHP superglobals

      $DiscussionID = $_REQUEST['DiscussionID'];
      $page = $_REQUEST['page'];

      $DiscussionSearch = $Sender->DiscussionModel->GetWhere(array('ImportID' => $DiscussionID));

      if ($DiscussionSearch->NumRows() > 0) {
         $Discussion = $DiscussionSearch->FirstRow();
         header('HTTP/1.1 301 Moved Permanently');
         Redirect('/discussion/'.$Discussion->DiscussionID.'/'.Format::Url($Discussion->Name));
      }
      else {
         Redirect($Sender->Routes['Default404']);
      }
   }

   public function Setup() {
   }
}

?>