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->setSubmitText( wfMsg( 'confirm_purge_button' ) );
        }

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

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

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