SpecialGoToInterwiki.php

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<?php
class SpecialGoToInterwiki extends UnlistedSpecialPage {
    public function __construct( $name = 'GoToInterwiki' ) {
        parent::__construct( $name );
    }

    public function execute( $par ) {
        // Allow forcing an interstitial for local interwikis. This is used
        // when a redirect page is reached via a special page which resolves
        // to a user-dependent value (as defined by
        // RedirectSpecialPage::personallyIdentifiableTarget). See the hack
        // for avoiding T109724 in MediaWiki::performRequest (which also
        // explains why we can't use a query parameter instead).
        $force = ( strpos( $par, 'force/' ) === 0 );
        if ( $force ) {
            $par = substr( $par, 6 );
        }

        $this->setHeaders();
        $target = Title::newFromText( $par );
        // Disallow special pages as a precaution against
        // possible redirect loops.
        if ( !$target || $target->isSpecialPage() ) {
            $this->getOutput()->setStatusCode( 404 );
            $this->getOutput()->addWikiMsg( 'gotointerwiki-invalid' );
            return;
        }

        $url = $target->getFullURL();
        if ( !$target->isExternal() || ( $target->isLocal() && !$force ) ) {
            // Either a normal page, or a local interwiki.
            // Just redirect.
            $this->getOutput()->redirect( $url, '301' );
        } else {
            $this->getOutput()->addWikiMsg(
                'gotointerwiki-external',
                $url,
                $target->getFullText()
            );
        }
    }

    public function requiresWrite() {
        return false;
    }

    protected function getGroupName() {
        return 'redirects';
    }
}