Download and install the plugin using the Plugin Manager using the following URL.

• http://samfisch.de/_media/documentation/sfdom/plugins/dokuplugin-ondeniedlogin.tgz

Or copy paste this code into your lib/plugins/ondeniedlogin/action.php .

action.php

<?php
  if(!defined('DOKU_INC')) die();
  if(!defined('DOKU_PLUGIN')) define('DOKU_PLUGIN',DOKU_INC.'lib/plugins/');
  require_once(DOKU_PLUGIN.'action.php');
 
  class action_plugin_ondeniedlogin extends DokuWiki_Action_Plugin {
 
    function getInfo(){
      return array(
        'author' => 'Samuel Fischer',
        'email'  => 'sf@notomorrow.de',
        'date'   => '2009-04-21',
        'name'   => 'ondeniedlogin',
        'desc'   => 'redirects unknown users to a login form on denied requests',
        'url'    => 'http://www.dokuwiki.org/plugin:ondeniedlogin',
      );
    }
 
  function register(Doku_Event_Handler $controller) {
      $controller->register_hook('TPL_ACT_RENDER', 'BEFORE',  $this, 'ondeniedlogin');
    }
 
    function ondeniedlogin(&$event, $param) {
        global $ACT, $INFO;
 
        if($ACT!='denied') return;
          if(!is_array($INFO['userinfo']))
                $ACT = 'login';
    }
 
  }

This adds the following functionality to this plugin: When your ACLs allow someone to see some pages but maybe not the start page, this helps him because he gets some search hits instead of “Permission denied”…

ondenied-search.patch

--- ondeniedlogin/action.php    2011-08-26 16:47:00.000000000 +0200
+++ ondeniedlogin/action.php    2011-08-26 16:54:23.000000000 +0200
@@ -26,6 +26,8 @@
       if($ACT!='denied') return;
         if(!is_array($INFO['userinfo']))
        $ACT = 'login';
+        else
+       $ACT = 'search';
     }
 
   }

Some templates (e.g. dokuwiki) set html classes on outer elements describing the action. The TPL_ACT_RENDER event is too late to alter this. The change below switches to use ACTION_HEADERS_SEND, so immediately after DokuWiki sends the 403 permission denied header.

      $controller->register_hook('ACTION_HEADERS_SEND', 'AFTER',  $this, 'ondeniedlogin');