RollbackAction.php

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<?php
class RollbackAction extends FormlessAction {

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

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

        public function onView() {
                $details = null;

                $request = $this->getRequest();

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

                if ( in_array( array( 'actionthrottledtext' ), $result ) ) {
                        throw new ThrottledError;
                }

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

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

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

                        return;
                }

                # Display permissions errors before read-only message -- there's no
                # point in misleading the user into thinking the inability to rollback
                # is only temporary.
                if ( !empty( $result ) && $result !== array( array( 'readonlytext' ) ) ) {
                        # array_diff is completely broken for arrays of arrays, sigh.
                        # Remove any 'readonlytext' error manually.
                        $out = array();
                        foreach ( $result as $error ) {
                                if ( $error != array( 'readonlytext' ) ) {
                                        $out [] = $error;
                                }
                        }
                        throw new PermissionsError( 'rollback', $out );
                }

                if ( $result == array( array( 'readonlytext' ) ) ) {
                        throw new ReadOnlyError;
                }

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

                if ( $current->getUserText() === '' ) {
                        $old = wfMsg( 'rev-deleted-user' );
                } else {
                        $old = Linker::userLink( $current->getUser(), $current->getUserText() )
                                . Linker::userToolLinks( $current->getUser(), $current->getUserText() );
                }

                $new = Linker::userLink( $target->getUser(), $target->getUserText() )
                        . Linker::userToolLinks( $target->getUser(), $target->getUserText() );
                $this->getOutput()->addHTML( wfMsgExt( 'rollback-success', array( 'parse', 'replaceafter' ), $old, $new ) );
                $this->getOutput()->returnToMain( false, $this->getTitle() );

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

        protected function getDescription() {
                return '';
        }
}