SpecialDiff.php

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<?php
class SpecialDiff extends RedirectSpecialPage {
    public function __construct() {
        parent::__construct( 'Diff' );
        $this->mAllowedRedirectParams = [];
    }
 
    public function getRedirect( $subpage ) {
        $parts = explode( '/', $subpage );
 
        // Try to parse the values given, generating somewhat pretty URLs if possible
        if ( count( $parts ) === 1 && $parts[0] !== '' ) {
            $this->mAddedRedirectParams['diff'] = $parts[0];
        } elseif ( count( $parts ) === 2 ) {
            $this->mAddedRedirectParams['oldid'] = $parts[0];
            $this->mAddedRedirectParams['diff'] = $parts[1];
        } else {
            return false;
        }
 
        return true;
    }
 
    protected function showNoRedirectPage() {
        $this->addHelpLink( 'Help:Diff' );
        $this->setHeaders();
        $this->outputHeader();
        $this->showForm();
    }
 
    private function showForm() {
        $form = HTMLForm::factory( 'ooui', [
            'oldid' => [
                'name' => 'oldid',
                'type' => 'int',
                'label-message' => 'diff-form-oldid',
            ],
            'diff' => [
                'name' => 'diff',
                'class' => HTMLTextField::class,
                'label-message' => 'diff-form-revid',
            ],
        ], $this->getContext(), 'diff-form' );
        $form->setSubmitTextMsg( 'diff-form-submit' );
        $form->setSubmitCallback( [ $this, 'onFormSubmit' ] );
        $form->show();
    }
 
    public function onFormSubmit( $formData ) {
        $params = [];
        if ( $formData['oldid'] ) {
            $params[] = $formData['oldid'];
        }
        if ( $formData['diff'] ) {
            $params[] = $formData['diff'];
        }
        $title = $this->getPageTitle( $params ? implode( '/', $params ) : null );
        $url = $title->getFullUrlForRedirect();
        $this->getOutput()->redirect( $url );
    }
 
    public function getDescription() {
        // 'diff' message is in lowercase, using own message
        return $this->msg( 'diff-form' )->text();
    }
 
    public function getName() {
        return 'diff-form';
    }
 
    public function isListed() {
        return true;
    }
 
    protected function getGroupName() {
        return 'redirects';
    }
}