Extension:IsAllowedHook.php

This code exhibits voodoo programming techniques. The most common of these is extending an instance's class at runtime after it has been instantiated, a technique that can be used to provide additional hooks into existing code without requiring modification of code-base files. For a list of all our scripts which exhibit voodoo, see Category:Code that uses voodoo.

<php> <?php

1. Extension:IsAllowedHook
2. - Started: 2007-10-09
3. - Licenced under LGPL (http://www.gnu.org/copyleft/lesser.html)

if (!defined('MEDIAWIKI')) die('Not an entry point.');

define('ISALLOWED_VERSION','0.0.0, 2007-10-09');

$wgExtensionCredits['parserhook'][] = array( 'name' => "IsAllowedHook", 'author' => 'User:Nad', 'description' => 'Adds a new hook called "IsAllowed" which is called from the User::isAllowed method.', 'url' => 'http://www.organicdesign.co.nz/Extension:IsAllowedHook.php', 'version' => ISALLOWED_VERSION );

1. This is the earliest hook I can find after which $wgUser is an instance of the User class

$wgHooks['userCan'][] = 'wfSetupIsAllowed'; function wfSetupIsAllowed() {

# Return unless first call static $first = 0; if ($first++) return true; global $wgUser;

# Create a new User class ($User2) by extending the existing one with an overridden isAllowed method $User = get_class($wgUser); $User2 = $User.'2'; eval("class $User2 extends $User".' { function isAllowed($action = "") { $result = NULL; wfRunHooks("IsAllowed",array(&$this,$action,&$result)); return $result === NULL ? $result = parent::isAllowed($action) : $result; } }');

# Replace the $wgUser object with an identical $User2 instance $oldUser = $wgUser; $wgUser = new $User2(); foreach(array_keys(get_class_vars($User)) as $k) $wgUser->$k = $oldUser->$k;

return true; }

?> </php>