ApiRollback.php

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<?php
class ApiRollback extends ApiBase {

        public function __construct( $main, $action ) {
                parent::__construct( $main, $action );
        }

        private $mTitleObj = null;

        private $mUser = null;

        public function execute() {
                $params = $this->extractRequestParams();

                // User and title already validated in call to getTokenSalt from Main
                $titleObj = $this->getRbTitle();
                $pageObj = WikiPage::factory( $titleObj );
                $summary = ( isset( $params['summary'] ) ? $params['summary'] : '' );
                $details = array();
                $retval = $pageObj->doRollback( $this->getRbUser(), $summary, $params['token'], $params['markbot'], $details, $this->getUser() );

                if ( $retval ) {
                        // We don't care about multiple errors, just report one of them
                        $this->dieUsageMsg( reset( $retval ) );
                }

                $this->setWatch( $params['watchlist'], $titleObj );

                $info = array(
                        'title' => $titleObj->getPrefixedText(),
                        'pageid' => intval( $details['current']->getPage() ),
                        'summary' => $details['summary'],
                        'revid' => intval( $details['newid'] ),
                        'old_revid' => intval( $details['current']->getID() ),
                        'last_revid' => intval( $details['target']->getID() )
                );

                $this->getResult()->addValue( null, $this->getModuleName(), $info );
        }

        public function mustBePosted() {
                return true;
        }

        public function isWriteMode() {
                return true;
        }

        public function getAllowedParams() {
                return array(
                        'title' => array(
                                ApiBase::PARAM_TYPE => 'string',
                                ApiBase::PARAM_REQUIRED => true
                        ),
                        'user' => array(
                                ApiBase::PARAM_TYPE => 'string',
                                ApiBase::PARAM_REQUIRED => true
                        ),
                        'token' => null,
                        'summary' => null,
                        'markbot' => false,
                        'watchlist' => array(
                                ApiBase::PARAM_DFLT => 'preferences',
                                ApiBase::PARAM_TYPE => array(
                                        'watch',
                                        'unwatch',
                                        'preferences',
                                        'nochange'
                                ),
                        ),
                );
        }

        public function getParamDescription() {
                return array(
                        'title' => 'Title of the page you want to rollback.',
                        'user' => 'Name of the user whose edits are to be rolled back. If set incorrectly, you\'ll get a badtoken error.',
                        'token' => "A rollback token previously retrieved through {$this->getModulePrefix()}prop=revisions",
                        'summary' => 'Custom edit summary. If not set, default summary will be used',
                        'markbot' => 'Mark the reverted edits and the revert as bot edits',
                        'watchlist' => 'Unconditionally add or remove the page from your watchlist, use preferences or do not change watch',
                );
        }

        public function getDescription() {
                return array(
                        'Undo the last edit to the page. If the last user who edited the page made multiple edits in a row,',
                        'they will all be rolled back'
                );
        }

        public function getPossibleErrors() {
                return array_merge( parent::getPossibleErrors(), array(
                        array( 'invalidtitle', 'title' ),
                        array( 'notanarticle' ),
                        array( 'invaliduser', 'user' ),
                ) );
        }

        public function needsToken() {
                return true;
        }

        public function getTokenSalt() {
                return array( $this->getRbTitle()->getPrefixedText(), $this->getRbUser() );
        }

        private function getRbUser() {
                if ( $this->mUser !== null ) {
                        return $this->mUser;
                }

                $params = $this->extractRequestParams();

                // We need to be able to revert IPs, but getCanonicalName rejects them
                $this->mUser = User::isIP( $params['user'] )
                        ? $params['user']
                        : User::getCanonicalName( $params['user'] );
                if ( !$this->mUser ) {
                        $this->dieUsageMsg( array( 'invaliduser', $params['user'] ) );
                }

                return $this->mUser;
        }

        private function getRbTitle() {
                if ( $this->mTitleObj !== null ) {
                        return $this->mTitleObj;
                }

                $params = $this->extractRequestParams();

                $this->mTitleObj = Title::newFromText( $params['title'] );

                if ( !$this->mTitleObj ) {
                        $this->dieUsageMsg( array( 'invalidtitle', $params['title'] ) );
                }
                if ( !$this->mTitleObj->exists() ) {
                        $this->dieUsageMsg( 'notanarticle' );
                }

                return $this->mTitleObj;
        }

        public function getExamples() {
                return array(
                        'api.php?action=rollback&title=Main%20Page&user=Catrope&token=123ABC',
                        'api.php?action=rollback&title=Main%20Page&user=217.121.114.116&token=123ABC&summary=Reverting%20vandalism&markbot=1'
                );
        }

        public function getHelpUrls() {
                return 'https://www.mediawiki.org/wiki/API:Rollback';
        }

        public function getVersion() {
                return __CLASS__ . ': $Id$';
        }
}