SpecialNewSection.php

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<?php
class SpecialNewSection extends RedirectSpecialPage {
    public function __construct() {
        parent::__construct( 'NewSection' );
        $this->mAllowedRedirectParams = [ 'preloadtitle', 'nosummary', 'editintro',
            'preload', 'preloadparams', 'summary' ];
    }
 
    public function getRedirect( $subpage ) {
        if ( $subpage === null || $subpage === '' ) {
            return false;
        }
        $this->mAddedRedirectParams['title'] = $subpage;
        $this->mAddedRedirectParams['action'] = 'edit';
        $this->mAddedRedirectParams['section'] = 'new';
        return true;
    }
 
    protected function showNoRedirectPage() {
        $this->setHeaders();
        $this->outputHeader();
        $this->addHelpLink( 'Help:New section' );
        $this->showForm();
    }
 
    private function showForm() {
        $form = HTMLForm::factory( 'ooui', [
            'page' => [
                'type' => 'title',
                'name' => 'page',
                'label-message' => 'newsection-page',
                'required' => true,
                'creatable' => true,
            ],
        ], $this->getContext(), 'newsection' );
        $form->setSubmitTextMsg( 'newsection-submit' );
        $form->setSubmitCallback( [ $this, 'onFormSubmit' ] );
        $form->show();
    }
 
    public function onFormSubmit( $formData ) {
        $title = $formData['page'];
        $page = Title::newFromTextThrow( $title );
        $query = [ 'action' => 'edit', 'section' => 'new' ];
        $url = $page->getFullUrlForRedirect( $query );
        $this->getOutput()->redirect( $url );
    }
 
    public function isListed() {
        return true;
    }
 
    protected function getGroupName() {
        return 'redirects';
    }
}