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./othercms/ips_4.3.4/applications/core/interface/facebook/auth.php
<?php
/**
 * @brief        Facebook Login Handler Redirect URI Handler
 * @author        <a href='https://www.invisioncommunity.com'>Invision Power Services, Inc.</a>
 * @copyright    (c) Invision Power Services, Inc.
 * @license        https://www.invisioncommunity.com/legal/standards/
 * @package        Invision Community
 * @since        20 Mar 2013
 */

define('REPORT_EXCEPTIONS', TRUE);
require_once
str_replace( 'applications/core/interface/facebook/auth.php', '', str_replace( '\\', '/', __FILE__ ) ) . 'init.php';

$target = \IPS\Http\Url::internal( 'oauth/callback/', 'none' );

foreach ( array(
'code', 'state', 'scope', 'error', 'error_description', 'error_uri' ) as $k )
{
    if ( isset( \
IPS\Request::i()->$k ) )
    {
       
$target = $target->setQueryString( $k, \IPS\Request::i()->$k );
    }
}

\
IPS\Output::i()->redirect( $target );