PurgeAction.php

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<?php
class PurgeAction extends FormAction {

    private $redirectParams;

    public function getName() {
        return 'purge';
    }

    public function requiresUnblock() {
        return false;
    }

    public function getDescription() {
        return '';
    }

    protected function getFormFields() {
        return array();
    }

    public function onSubmit( $data ) {
        return $this->page->doPurge();
    }

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

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

        if ( $this->getUser()->isAllowed( 'purge' ) ) {
            $this->redirectParams = wfArrayToCgi( array_diff_key(
                $this->getRequest()->getQueryValues(),
                array( 'title' => null, 'action' => null )
            ) );
            if ( $this->onSubmit( array() ) ) {
                $this->onSuccess();
            }
        } else {
            $this->redirectParams = $this->getRequest()->getVal( 'redirectparams', '' );
            $form = $this->getForm();
            if ( $form->show() ) {
                $this->onSuccess();
            }
        }
    }

    protected function alterForm( HTMLForm $form ) {
        $form->setSubmitTextMsg( 'confirm_purge_button' );
    }

    protected function preText() {
        return $this->msg( 'confirm-purge-top' )->parse();
    }

    protected function postText() {
        return $this->msg( 'confirm-purge-bottom' )->parse();
    }

    public function onSuccess() {
        $this->getOutput()->redirect( $this->getTitle()->getFullURL( $this->redirectParams ) );
    }
}