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<?php
/**
* An interface for OpenID extensions.
*
* @package OpenID
*/
/**
* Require the Message implementation.
*/
require_once 'Auth/OpenID/Message.php';
/**
* A base class for accessing extension request and response data for
* the OpenID 2 protocol.
*
* @package OpenID
*/
class Auth_OpenID_Extension {
/**
* ns_uri: The namespace to which to add the arguments for this
* extension
*/
var $ns_uri = null;
var $ns_alias = null;
/**
* Get the string arguments that should be added to an OpenID
* message for this extension.
*/
function getExtensionArgs()
{
return null;
}
/**
* Add the arguments from this extension to the provided message.
*
* Returns the message with the extension arguments added.
*/
function toMessage($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;
}
}
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