SpecialPermanentLink.php

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<?php
class SpecialPermanentLink extends RedirectSpecialPage {
    function __construct() {
        parent::__construct( 'PermanentLink' );
        $this->mAllowedRedirectParams = array();
    }

    function getRedirect( $subpage ) {
        $subpage = intval( $subpage );
        if ( $subpage === 0 ) {
            # throw an error page when no subpage was given
            throw new ErrorPageError( 'nopagetitle', 'nopagetext' );
        }
        $this->mAddedRedirectParams['oldid'] = $subpage;

        return true;
    }
}