FormAction.php

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<?php
abstract class FormAction extends Action {

    protected function getFormFields() {
        // Default to an empty form with just a submit button
        return [];
    }

    protected function preText() {
        return '';
    }

    protected function postText() {
        return '';
    }

    protected function alterForm( HTMLForm $form ) {
    }

    protected function getForm() {
        $this->fields = $this->getFormFields();

        // Give hooks a chance to alter the form, adding extra fields or text etc
        Hooks::run( 'ActionModifyFormFields', [ $this->getName(), &$this->fields, $this->page ] );

        $form = new HTMLForm( $this->fields, $this->getContext(), $this->getName() );
        $form->setSubmitCallback( [ $this, 'onSubmit' ] );

        $title = $this->getTitle();
        $form->setAction( $title->getLocalURL( [ 'action' => $this->getName() ] ) );
        // Retain query parameters (uselang etc)
        $params = array_diff_key(
            $this->getRequest()->getQueryValues(),
            [ 'action' => null, 'title' => null ]
        );
        if ( $params ) {
            $form->addHiddenField( 'redirectparams', wfArrayToCgi( $params ) );
        }

        $form->addPreText( $this->preText() );
        $form->addPostText( $this->postText() );
        $this->alterForm( $form );

        // Give hooks a chance to alter the form, adding extra fields or text etc
        Hooks::run( 'ActionBeforeFormDisplay', [ $this->getName(), &$form, $this->page ] );

        return $form;
    }

    abstract public function onSubmit( $data );

    abstract public function onSuccess();

    public function show() {
        $this->setHeaders();

        // This will throw exceptions if there's a problem
        $this->checkCanExecute( $this->getUser() );

        $form = $this->getForm();
        if ( $form->show() ) {
            $this->onSuccess();
        }
    }

    public function doesWrites() {
        return true;
    }
}