SpecialPermanentLink.php

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<?php
class SpecialPermanentLink extends RedirectSpecialPage {
    public function __construct() {
        parent::__construct( 'PermanentLink' );
        $this->mAllowedRedirectParams = [];
    }
 
    public function getRedirect( $subpage ) {
        $subpage = intval( $subpage );
        if ( $subpage === 0 ) {
            return false;
        }
        $this->mAddedRedirectParams['oldid'] = $subpage;
 
        return true;
    }
 
    protected function showNoRedirectPage() {
        $this->addHelpLink( 'Help:PermanentLink' );
        $this->setHeaders();
        $this->outputHeader();
        $this->showForm();
    }
 
    private function showForm() {
        HTMLForm::factory( 'ooui', [
            'revid' => [
                'type' => 'int',
                'name' => 'revid',
                'label-message' => 'permanentlink-revid',
            ],
        ], $this->getContext(), 'permanentlink' )
            ->setSubmitTextMsg( 'permanentlink-submit' )
            ->setSubmitCallback( [ $this, 'onFormSubmit' ] )
            ->show();
    }
 
    public function onFormSubmit( $formData ) {
        $revid = $formData['revid'];
        $title = $this->getPageTitle( $revid ?: null );
        $url = $title->getFullUrlForRedirect();
        $this->getOutput()->redirect( $url );
    }
 
    public function isListed() {
        return true;
    }
 
    protected function getGroupName() {
        return 'redirects';
    }
}