RollbackAction.php

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<?php
class RollbackAction extends FormlessAction {

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

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

    public function onView() {
        // TODO: use $this->useTransactionalTimeLimit(); when POST only
        wfTransactionalTimeLimit();

        $request = $this->getRequest();
        $user = $this->getUser();
        $from = $request->getVal( 'from' );
        $rev = $this->page->getRevision();
        if ( $from === null ) {
            throw new ErrorPageError( 'rollbackfailed', 'rollback-missingparam' );
        }
        if ( !$rev ) {
            throw new ErrorPageError( 'rollbackfailed', 'rollback-missingrevision' );
        }
        if ( $from !== $rev->getUserText() ) {
            throw new ErrorPageError( 'rollbackfailed', 'alreadyrolled', [
                $this->getTitle()->getPrefixedText(),
                $from,
                $rev->getUserText()
            ] );
        }

        $data = null;
        $errors = $this->page->doRollback(
            $from,
            $request->getText( 'summary' ),
            $request->getVal( 'token' ),
            $request->getBool( 'bot' ),
            $data,
            $this->getUser()
        );

        if ( in_array( [ 'actionthrottledtext' ], $errors ) ) {
            throw new ThrottledError;
        }

        if ( isset( $errors[0][0] ) &&
            ( $errors[0][0] == 'alreadyrolled' || $errors[0][0] == 'cantrollback' )
        ) {
            $this->getOutput()->setPageTitle( $this->msg( 'rollbackfailed' ) );
            $errArray = $errors[0];
            $errMsg = array_shift( $errArray );
            $this->getOutput()->addWikiMsgArray( $errMsg, $errArray );

            if ( isset( $data['current'] ) ) {
                $current = $data['current'];

                if ( $current->getComment() != '' ) {
                    $this->getOutput()->addHTML( $this->msg( 'editcomment' )->rawParams(
                        Linker::formatComment( $current->getComment() ) )->parse() );
                }
            }

            return;
        }

        # NOTE: Permission errors already handled by Action::checkExecute.
        if ( $errors == [ [ 'readonlytext' ] ] ) {
            throw new ReadOnlyError;
        }

        # XXX: Would be nice if ErrorPageError could take multiple errors, and/or a status object.
        #      Right now, we only show the first error
        foreach ( $errors as $error ) {
            throw new ErrorPageError( 'rollbackfailed', $error[0], array_slice( $error, 1 ) );
        }

        $current = $data['current'];
        $target = $data['target'];
        $newId = $data['newid'];
        $this->getOutput()->setPageTitle( $this->msg( 'actioncomplete' ) );
        $this->getOutput()->setRobotPolicy( 'noindex,nofollow' );

        $old = Linker::revUserTools( $current );
        $new = Linker::revUserTools( $target );
        $this->getOutput()->addHTML( $this->msg( 'rollback-success' )->rawParams( $old, $new )
            ->parseAsBlock() );

        if ( $user->getBoolOption( 'watchrollback' ) ) {
            $user->addWatch( $this->page->getTitle(), User::IGNORE_USER_RIGHTS );
        }

        $this->getOutput()->returnToMain( false, $this->getTitle() );

        if ( !$request->getBool( 'hidediff', false ) &&
            !$this->getUser()->getBoolOption( 'norollbackdiff' )
        ) {
            $contentHandler = $current->getContentHandler();
            $de = $contentHandler->createDifferenceEngine(
                $this->getContext(),
                $current->getId(),
                $newId,
                false,
                true
            );
            $de->showDiff( '', '' );
        }
        return;
    }

    protected function getDescription() {
        return '';
    }

    public function doesWrites() {
        return true;
    }
}