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->setWrapperLegendMsg( 'filerevert-legend' );
        $form->setSubmitTextMsg( 'filerevert-submit' );
        $form->addHiddenField( 'oldimage', $this->getRequest()->getText( 'oldimage' ) );
    }

    protected function getFormFields() {
        global $wgContLang;

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

        $user = $this->getUser();
        $lang = $this->getLanguage();
        $userDate = $lang->userDate( $timestamp, $user );
        $userTime = $lang->userTime( $timestamp, $user );
        $siteDate = $wgContLang->date( $timestamp, false, false );
        $siteTime = $wgContLang->time( $timestamp, false, false );

        return array(
            'intro' => array(
                'type' => 'info',
                'vertical-label' => true,
                'raw' => true,
                'default' => $this->msg( 'filerevert-intro',
                    $this->getTitle()->getText(), $userDate, $userTime,
                    wfExpandUrl(
                        $this->page->getFile()->getArchiveUrl( $this->getRequest()->getText( 'oldimage' ) ),
                        PROTO_CURRENT
                    ) )->parseAsBlock()
            ),
            'comment' => array(
                'type' => 'text',
                'label-message' => 'filerevert-comment',
                'default' => $this->msg( 'filerevert-defaultcomment', $siteDate, $siteTime
                    )->inContentLanguage()->text()
            )
        );
    }

    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,
            0,
            false,
            false,
            $this->getUser()
        );
    }

    public function onSuccess() {
        $timestamp = $this->oldFile->getTimestamp();
        $user = $this->getUser();
        $lang = $this->getLanguage();
        $userDate = $lang->userDate( $timestamp, $user );
        $userTime = $lang->userTime( $timestamp, $user );

        $this->getOutput()->addWikiMsg( 'filerevert-success', $this->getTitle()->getText(),
            $userDate, $userTime,
            wfExpandUrl( $this->page->getFile()->getArchiveUrl( $this->getRequest()->getText( 'oldimage' ) ),
                PROTO_CURRENT
        ) );
        $this->getOutput()->returnToMain( false, $this->getTitle() );
    }

    protected function getPageTitle() {
        return $this->msg( 'filerevert', $this->getTitle()->getText() );
    }

    protected function getDescription() {
        $this->getOutput()->addBacklinkSubtitle( $this->getTitle() );

        return '';
    }
}