Extension.php

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<?php
 
require_once 'Auth/OpenID/Message.php';
 
class Auth_OpenID_Extension {
    var $ns_uri = null;
    var $ns_alias = null;
 
    function getExtensionArgs()
    {
        return null;
    }
 
    function toMessage($message)
    {
        $implicit = $message->isOpenID1();
        $added = $message->namespaces->addAlias($this->ns_uri,
                                                $this->ns_alias,
                                                $implicit);
 
        if ($added === null) {
            if ($message->namespaces->getAlias($this->ns_uri) !=
                $this->ns_alias) {
                return null;
            }
        }
 
        $message->updateArgs($this->ns_uri,
                             $this->getExtensionArgs());
        return $message;
    }
}