RevertAction.php

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<?php
class RevertAction extends Action {

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

        public function show() {
                $this->getOutput()->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
        }

        public function execute() {}
}

class RevertFileAction extends FormAction {
        protected $oldFile;

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

        public function getRestriction() {
                return 'upload';
        }

        protected function checkCanExecute( User $user ) {
                parent::checkCanExecute( $user );

                $oldimage = $this->getRequest()->getText( 'oldimage' );
                if ( strlen( $oldimage ) < 16
                        || strpos( $oldimage, '/' ) !== false
                        || strpos( $oldimage, '\\' ) !== false )
                {
                        throw new ErrorPageError( 'internalerror', 'unexpected', array( 'oldimage', $oldimage ) );
                }

                $this->oldFile = RepoGroup::singleton()->getLocalRepo()->newFromArchiveName( $this->getTitle(), $oldimage );
                if ( !$this->oldFile->exists() ) {
                        throw new ErrorPageError( '', 'filerevert-badversion' );
                }
        }

        protected function alterForm( HTMLForm $form ) {
                $form->setWrapperLegend( wfMsgHtml( 'filerevert-legend' ) );
                $form->setSubmitText( wfMsg( 'filerevert-submit' ) );
                $form->addHiddenField( 'oldimage', $this->getRequest()->getText( 'oldimage' ) );
        }

        protected function getFormFields() {
                global $wgContLang;

                $timestamp = $this->oldFile->getTimestamp();

                return array(
                        'intro' => array(
                                'type' => 'info',
                                'vertical-label' => true,
                                'raw' => true,
                                'default' => wfMsgExt( 'filerevert-intro', 'parse', $this->getTitle()->getText(),
                                        $this->getLanguage()->date( $timestamp, true ), $this->getLanguage()->time( $timestamp, true ),
                                        wfExpandUrl( $this->page->getFile()->getArchiveUrl( $this->getRequest()->getText( 'oldimage' ) ),
                                                PROTO_CURRENT
                                ) )
                        ),
                        'comment' => array(
                                'type' => 'text',
                                'label-message' => 'filerevert-comment',
                                'default' => wfMsgForContent( 'filerevert-defaultcomment',
                                        $wgContLang->date( $timestamp, false, false ), $wgContLang->time( $timestamp, false, false ) ),
                        )
                );
        }

        public function onSubmit( $data ) {
                $source = $this->page->getFile()->getArchiveVirtualUrl( $this->getRequest()->getText( 'oldimage' ) );
                $comment = $data['comment'];
                // TODO: Preserve file properties from database instead of reloading from file
                return $this->page->getFile()->upload( $source, $comment, $comment );
        }

        public function onSuccess() {
                $timestamp = $this->oldFile->getTimestamp();
                $this->getOutput()->addHTML( wfMsgExt( 'filerevert-success', 'parse', $this->getTitle()->getText(),
                        $this->getLanguage()->date( $timestamp, true ),
                        $this->getLanguage()->time( $timestamp, true ),
                        wfExpandUrl( $this->page->getFile()->getArchiveUrl( $this->getRequest()->getText( 'oldimage' ) ),
                                PROTO_CURRENT
                ) ) );
                $this->getOutput()->returnToMain( false, $this->getTitle() );
        }

        protected function getPageTitle() {
                return wfMsg( 'filerevert', $this->getTitle()->getText() );
        }
        
        protected function getDescription() {
                $this->getOutput()->addBacklinkSubtitle( $this->getTitle() );
                return '';
        }
}