RecentChange.php

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<?php
class RecentChange {
    // Constants for the rc_source field.  Extensions may also have
    // their own source constants.
    const SRC_EDIT = 'mw.edit';
    const SRC_NEW = 'mw.new';
    const SRC_LOG = 'mw.log';
    const SRC_EXTERNAL = 'mw.external'; // obsolete
    const SRC_CATEGORIZE = 'mw.categorize';
 
    public $mAttribs = [];
    public $mExtra = [];
 
    public $mTitle = false;
 
    private $mPerformer = false;
 
    public $numberofWatchingusers = 0; # Dummy to prevent error message in SpecialRecentChangesLinked
    public $notificationtimestamp;
 
    public $counter = -1;
 
    private $tags = [];
 
    private static $changeTypes = [
        'edit' => RC_EDIT,
        'new' => RC_NEW,
        'log' => RC_LOG,
        'external' => RC_EXTERNAL,
        'categorize' => RC_CATEGORIZE,
    ];
 
    # Factory methods
 
    public static function newFromRow( $row ) {
        $rc = new RecentChange;
        $rc->loadFromRow( $row );
 
        return $rc;
    }
 
    public static function parseToRCType( $type ) {
        if ( is_array( $type ) ) {
            $retval = [];
            foreach ( $type as $t ) {
                $retval[] = self::parseToRCType( $t );
            }
 
            return $retval;
        }
 
        if ( !array_key_exists( $type, self::$changeTypes ) ) {
            throw new MWException( "Unknown type '$type'" );
        }
        return self::$changeTypes[$type];
    }
 
    public static function parseFromRCType( $rcType ) {
        return array_search( $rcType, self::$changeTypes, true ) ?: "$rcType";
    }
 
    public static function getChangeTypes() {
        return array_keys( self::$changeTypes );
    }
 
    public static function newFromId( $rcid ) {
        return self::newFromConds( [ 'rc_id' => $rcid ], __METHOD__ );
    }
 
    public static function newFromConds(
        $conds,
        $fname = __METHOD__,
        $dbType = DB_REPLICA
    ) {
        $db = wfGetDB( $dbType );
        $row = $db->selectRow( 'recentchanges', self::selectFields(), $conds, $fname );
        if ( $row !== false ) {
            return self::newFromRow( $row );
        } else {
            return null;
        }
    }
 
    public static function selectFields() {
        return [
            'rc_id',
            'rc_timestamp',
            'rc_user',
            'rc_user_text',
            'rc_namespace',
            'rc_title',
            'rc_minor',
            'rc_bot',
            'rc_new',
            'rc_cur_id',
            'rc_this_oldid',
            'rc_last_oldid',
            'rc_type',
            'rc_source',
            'rc_patrolled',
            'rc_ip',
            'rc_old_len',
            'rc_new_len',
            'rc_deleted',
            'rc_logid',
            'rc_log_type',
            'rc_log_action',
            'rc_params',
        ] + CommentStore::newKey( 'rc_comment' )->getFields();
    }
 
    # Accessors
 
    public function setAttribs( $attribs ) {
        $this->mAttribs = $attribs;
    }
 
    public function setExtra( $extra ) {
        $this->mExtra = $extra;
    }
 
    public function &getTitle() {
        if ( $this->mTitle === false ) {
            $this->mTitle = Title::makeTitle( $this->mAttribs['rc_namespace'], $this->mAttribs['rc_title'] );
        }
 
        return $this->mTitle;
    }
 
    public function getPerformer() {
        if ( $this->mPerformer === false ) {
            if ( $this->mAttribs['rc_user'] ) {
                $this->mPerformer = User::newFromId( $this->mAttribs['rc_user'] );
            } else {
                $this->mPerformer = User::newFromName( $this->mAttribs['rc_user_text'], false );
            }
        }
 
        return $this->mPerformer;
    }
 
    public function save( $noudp = false ) {
        global $wgPutIPinRC, $wgUseEnotif, $wgShowUpdatedMarker;
 
        $dbw = wfGetDB( DB_MASTER );
        if ( !is_array( $this->mExtra ) ) {
            $this->mExtra = [];
        }
 
        if ( !$wgPutIPinRC ) {
            $this->mAttribs['rc_ip'] = '';
        }
 
        # Strict mode fixups (not-NULL fields)
        foreach ( [ 'minor', 'bot', 'new', 'patrolled', 'deleted' ] as $field ) {
            $this->mAttribs["rc_$field"] = (int)$this->mAttribs["rc_$field"];
        }
        # ...more fixups (NULL fields)
        foreach ( [ 'old_len', 'new_len' ] as $field ) {
            $this->mAttribs["rc_$field"] = isset( $this->mAttribs["rc_$field"] )
                ? (int)$this->mAttribs["rc_$field"]
                : null;
        }
 
        # If our database is strict about IP addresses, use NULL instead of an empty string
        $strictIPs = in_array( $dbw->getType(), [ 'oracle', 'postgres' ] ); // legacy
        if ( $strictIPs && $this->mAttribs['rc_ip'] == '' ) {
            unset( $this->mAttribs['rc_ip'] );
        }
 
        # Trim spaces on user supplied text
        $this->mAttribs['rc_comment'] = trim( $this->mAttribs['rc_comment'] );
 
        # Fixup database timestamps
        $this->mAttribs['rc_timestamp'] = $dbw->timestamp( $this->mAttribs['rc_timestamp'] );
 
        # # If we are using foreign keys, an entry of 0 for the page_id will fail, so use NULL
        if ( $this->mAttribs['rc_cur_id'] == 0 ) {
            unset( $this->mAttribs['rc_cur_id'] );
        }
 
        # Convert mAttribs['rc_comment'] for CommentStore
        $row = $this->mAttribs;
        $comment = $row['rc_comment'];
        unset( $row['rc_comment'], $row['rc_comment_text'], $row['rc_comment_data'] );
        $row += CommentStore::newKey( 'rc_comment' )->insert( $dbw, $comment );
 
        # Don't reuse an existing rc_id for the new row, if one happens to be
        # set for some reason.
        unset( $row['rc_id'] );
 
        # Insert new row
        $dbw->insert( 'recentchanges', $row, __METHOD__ );
 
        # Set the ID
        $this->mAttribs['rc_id'] = $dbw->insertId();
 
        # Notify extensions
        // Avoid PHP 7.1 warning from passing $this by reference
        $rc = $this;
        Hooks::run( 'RecentChange_save', [ &$rc ] );
 
        if ( count( $this->tags ) ) {
            ChangeTags::addTags( $this->tags, $this->mAttribs['rc_id'],
                $this->mAttribs['rc_this_oldid'], $this->mAttribs['rc_logid'], null, $this );
        }
 
        # Notify external application via UDP
        if ( !$noudp ) {
            $this->notifyRCFeeds();
        }
 
        # E-mail notifications
        if ( $wgUseEnotif || $wgShowUpdatedMarker ) {
            $editor = $this->getPerformer();
            $title = $this->getTitle();
 
            // Never send an RC notification email about categorization changes
            if (
                Hooks::run( 'AbortEmailNotification', [ $editor, $title, $this ] ) &&
                $this->mAttribs['rc_type'] != RC_CATEGORIZE
            ) {
                // @FIXME: This would be better as an extension hook
                // Send emails or email jobs once this row is safely committed
                $dbw->onTransactionIdle(
                    function () use ( $editor, $title ) {
                        $enotif = new EmailNotification();
                        $enotif->notifyOnPageChange(
                            $editor,
                            $title,
                            $this->mAttribs['rc_timestamp'],
                            $this->mAttribs['rc_comment'],
                            $this->mAttribs['rc_minor'],
                            $this->mAttribs['rc_last_oldid'],
                            $this->mExtra['pageStatus']
                        );
                    },
                    __METHOD__
                );
            }
        }
 
        // Update the cached list of active users
        if ( $this->mAttribs['rc_user'] > 0 ) {
            JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newCacheUpdateJob() );
        }
    }
 
    public function notifyRCFeeds( array $feeds = null ) {
        global $wgRCFeeds;
        if ( $feeds === null ) {
            $feeds = $wgRCFeeds;
        }
 
        $performer = $this->getPerformer();
 
        foreach ( $feeds as $params ) {
            $params += [
                'omit_bots' => false,
                'omit_anon' => false,
                'omit_user' => false,
                'omit_minor' => false,
                'omit_patrolled' => false,
            ];
 
            if (
                ( $params['omit_bots'] && $this->mAttribs['rc_bot'] ) ||
                ( $params['omit_anon'] && $performer->isAnon() ) ||
                ( $params['omit_user'] && !$performer->isAnon() ) ||
                ( $params['omit_minor'] && $this->mAttribs['rc_minor'] ) ||
                ( $params['omit_patrolled'] && $this->mAttribs['rc_patrolled'] ) ||
                $this->mAttribs['rc_type'] == RC_EXTERNAL
            ) {
                continue;
            }
 
            if ( isset( $this->mExtra['actionCommentIRC'] ) ) {
                $actionComment = $this->mExtra['actionCommentIRC'];
            } else {
                $actionComment = null;
            }
 
            $feed = RCFeed::factory( $params );
            $feed->notify( $this, $actionComment );
        }
    }
 
    public static function getEngine( $uri, $params = [] ) {
        // TODO: Merge into RCFeed::factory().
        global $wgRCEngines;
        $scheme = parse_url( $uri, PHP_URL_SCHEME );
        if ( !$scheme ) {
            throw new MWException( "Invalid RCFeed uri: '$uri'" );
        }
        if ( !isset( $wgRCEngines[$scheme] ) ) {
            throw new MWException( "Unknown RCFeedEngine scheme: '$scheme'" );
        }
        if ( defined( 'MW_PHPUNIT_TEST' ) && is_object( $wgRCEngines[$scheme] ) ) {
            return $wgRCEngines[$scheme];
        }
        return new $wgRCEngines[$scheme]( $params );
    }
 
    public static function markPatrolled( $change, $auto = false, $tags = null ) {
        global $wgUser;
 
        $change = $change instanceof RecentChange
            ? $change
            : self::newFromId( $change );
 
        if ( !$change instanceof RecentChange ) {
            return null;
        }
 
        return $change->doMarkPatrolled( $wgUser, $auto, $tags );
    }
 
    public function doMarkPatrolled( User $user, $auto = false, $tags = null ) {
        global $wgUseRCPatrol, $wgUseNPPatrol, $wgUseFilePatrol;
 
        $errors = [];
        // If recentchanges patrol is disabled, only new pages or new file versions
        // can be patrolled, provided the appropriate config variable is set
        if ( !$wgUseRCPatrol && ( !$wgUseNPPatrol || $this->getAttribute( 'rc_type' ) != RC_NEW ) &&
            ( !$wgUseFilePatrol || !( $this->getAttribute( 'rc_type' ) == RC_LOG &&
            $this->getAttribute( 'rc_log_type' ) == 'upload' ) ) ) {
            $errors[] = [ 'rcpatroldisabled' ];
        }
        // Automatic patrol needs "autopatrol", ordinary patrol needs "patrol"
        $right = $auto ? 'autopatrol' : 'patrol';
        $errors = array_merge( $errors, $this->getTitle()->getUserPermissionsErrors( $right, $user ) );
        if ( !Hooks::run( 'MarkPatrolled',
                    [ $this->getAttribute( 'rc_id' ), &$user, false, $auto ] )
        ) {
            $errors[] = [ 'hookaborted' ];
        }
        // Users without the 'autopatrol' right can't patrol their
        // own revisions
        if ( $user->getName() === $this->getAttribute( 'rc_user_text' )
            && !$user->isAllowed( 'autopatrol' )
        ) {
            $errors[] = [ 'markedaspatrollederror-noautopatrol' ];
        }
        if ( $errors ) {
            return $errors;
        }
        // If the change was patrolled already, do nothing
        if ( $this->getAttribute( 'rc_patrolled' ) ) {
            return [];
        }
        // Actually set the 'patrolled' flag in RC
        $this->reallyMarkPatrolled();
        // Log this patrol event
        PatrolLog::record( $this, $auto, $user, $tags );
 
        Hooks::run(
            'MarkPatrolledComplete',
            [ $this->getAttribute( 'rc_id' ), &$user, false, $auto ]
        );
 
        return [];
    }
 
    public function reallyMarkPatrolled() {
        $dbw = wfGetDB( DB_MASTER );
        $dbw->update(
            'recentchanges',
            [
                'rc_patrolled' => 1
            ],
            [
                'rc_id' => $this->getAttribute( 'rc_id' )
            ],
            __METHOD__
        );
        // Invalidate the page cache after the page has been patrolled
        // to make sure that the Patrol link isn't visible any longer!
        $this->getTitle()->invalidateCache();
 
        return $dbw->affectedRows();
    }
 
    public static function notifyEdit(
        $timestamp, &$title, $minor, &$user, $comment, $oldId, $lastTimestamp,
        $bot, $ip = '', $oldSize = 0, $newSize = 0, $newId = 0, $patrol = 0,
        $tags = []
    ) {
        $rc = new RecentChange;
        $rc->mTitle = $title;
        $rc->mPerformer = $user;
        $rc->mAttribs = [
            'rc_timestamp' => $timestamp,
            'rc_namespace' => $title->getNamespace(),
            'rc_title' => $title->getDBkey(),
            'rc_type' => RC_EDIT,
            'rc_source' => self::SRC_EDIT,
            'rc_minor' => $minor ? 1 : 0,
            'rc_cur_id' => $title->getArticleID(),
            'rc_user' => $user->getId(),
            'rc_user_text' => $user->getName(),
            'rc_comment' => &$comment,
            'rc_comment_text' => &$comment,
            'rc_comment_data' => null,
            'rc_this_oldid' => $newId,
            'rc_last_oldid' => $oldId,
            'rc_bot' => $bot ? 1 : 0,
            'rc_ip' => self::checkIPAddress( $ip ),
            'rc_patrolled' => intval( $patrol ),
            'rc_new' => 0, # obsolete
            'rc_old_len' => $oldSize,
            'rc_new_len' => $newSize,
            'rc_deleted' => 0,
            'rc_logid' => 0,
            'rc_log_type' => null,
            'rc_log_action' => '',
            'rc_params' => ''
        ];
 
        $rc->mExtra = [
            'prefixedDBkey' => $title->getPrefixedDBkey(),
            'lastTimestamp' => $lastTimestamp,
            'oldSize' => $oldSize,
            'newSize' => $newSize,
            'pageStatus' => 'changed'
        ];
 
        DeferredUpdates::addCallableUpdate(
            function () use ( $rc, $tags ) {
                $rc->addTags( $tags );
                $rc->save();
                if ( $rc->mAttribs['rc_patrolled'] ) {
                    PatrolLog::record( $rc, true, $rc->getPerformer() );
                }
            },
            DeferredUpdates::POSTSEND,
            wfGetDB( DB_MASTER )
        );
 
        return $rc;
    }
 
    public static function notifyNew(
        $timestamp, &$title, $minor, &$user, $comment, $bot,
        $ip = '', $size = 0, $newId = 0, $patrol = 0, $tags = []
    ) {
        $rc = new RecentChange;
        $rc->mTitle = $title;
        $rc->mPerformer = $user;
        $rc->mAttribs = [
            'rc_timestamp' => $timestamp,
            'rc_namespace' => $title->getNamespace(),
            'rc_title' => $title->getDBkey(),
            'rc_type' => RC_NEW,
            'rc_source' => self::SRC_NEW,
            'rc_minor' => $minor ? 1 : 0,
            'rc_cur_id' => $title->getArticleID(),
            'rc_user' => $user->getId(),
            'rc_user_text' => $user->getName(),
            'rc_comment' => &$comment,
            'rc_comment_text' => &$comment,
            'rc_comment_data' => null,
            'rc_this_oldid' => $newId,
            'rc_last_oldid' => 0,
            'rc_bot' => $bot ? 1 : 0,
            'rc_ip' => self::checkIPAddress( $ip ),
            'rc_patrolled' => intval( $patrol ),
            'rc_new' => 1, # obsolete
            'rc_old_len' => 0,
            'rc_new_len' => $size,
            'rc_deleted' => 0,
            'rc_logid' => 0,
            'rc_log_type' => null,
            'rc_log_action' => '',
            'rc_params' => ''
        ];
 
        $rc->mExtra = [
            'prefixedDBkey' => $title->getPrefixedDBkey(),
            'lastTimestamp' => 0,
            'oldSize' => 0,
            'newSize' => $size,
            'pageStatus' => 'created'
        ];
 
        DeferredUpdates::addCallableUpdate(
            function () use ( $rc, $tags ) {
                $rc->addTags( $tags );
                $rc->save();
                if ( $rc->mAttribs['rc_patrolled'] ) {
                    PatrolLog::record( $rc, true, $rc->getPerformer() );
                }
            },
            DeferredUpdates::POSTSEND,
            wfGetDB( DB_MASTER )
        );
 
        return $rc;
    }
 
    public static function notifyLog( $timestamp, &$title, &$user, $actionComment, $ip, $type,
        $action, $target, $logComment, $params, $newId = 0, $actionCommentIRC = ''
    ) {
        global $wgLogRestrictions;
 
        # Don't add private logs to RC!
        if ( isset( $wgLogRestrictions[$type] ) && $wgLogRestrictions[$type] != '*' ) {
            return false;
        }
        $rc = self::newLogEntry( $timestamp, $title, $user, $actionComment, $ip, $type, $action,
            $target, $logComment, $params, $newId, $actionCommentIRC );
        $rc->save();
 
        return true;
    }
 
    public static function newLogEntry( $timestamp, &$title, &$user, $actionComment, $ip,
        $type, $action, $target, $logComment, $params, $newId = 0, $actionCommentIRC = '',
        $revId = 0, $isPatrollable = false ) {
        global $wgRequest;
 
        # # Get pageStatus for email notification
        switch ( $type . '-' . $action ) {
            case 'delete-delete':
            case 'delete-delete_redir':
                $pageStatus = 'deleted';
                break;
            case 'move-move':
            case 'move-move_redir':
                $pageStatus = 'moved';
                break;
            case 'delete-restore':
                $pageStatus = 'restored';
                break;
            case 'upload-upload':
                $pageStatus = 'created';
                break;
            case 'upload-overwrite':
            default:
                $pageStatus = 'changed';
                break;
        }
 
        // Allow unpatrolled status for patrollable log entries
        $markPatrolled = $isPatrollable ? $user->isAllowed( 'autopatrol' ) : true;
 
        $rc = new RecentChange;
        $rc->mTitle = $target;
        $rc->mPerformer = $user;
        $rc->mAttribs = [
            'rc_timestamp' => $timestamp,
            'rc_namespace' => $target->getNamespace(),
            'rc_title' => $target->getDBkey(),
            'rc_type' => RC_LOG,
            'rc_source' => self::SRC_LOG,
            'rc_minor' => 0,
            'rc_cur_id' => $target->getArticleID(),
            'rc_user' => $user->getId(),
            'rc_user_text' => $user->getName(),
            'rc_comment' => &$logComment,
            'rc_comment_text' => &$logComment,
            'rc_comment_data' => null,
            'rc_this_oldid' => $revId,
            'rc_last_oldid' => 0,
            'rc_bot' => $user->isAllowed( 'bot' ) ? (int)$wgRequest->getBool( 'bot', true ) : 0,
            'rc_ip' => self::checkIPAddress( $ip ),
            'rc_patrolled' => $markPatrolled ? 1 : 0,
            'rc_new' => 0, # obsolete
            'rc_old_len' => null,
            'rc_new_len' => null,
            'rc_deleted' => 0,
            'rc_logid' => $newId,
            'rc_log_type' => $type,
            'rc_log_action' => $action,
            'rc_params' => $params
        ];
 
        $rc->mExtra = [
            'prefixedDBkey' => $title->getPrefixedDBkey(),
            'lastTimestamp' => 0,
            'actionComment' => $actionComment, // the comment appended to the action, passed from LogPage
            'pageStatus' => $pageStatus,
            'actionCommentIRC' => $actionCommentIRC
        ];
 
        return $rc;
    }
 
    public static function newForCategorization(
        $timestamp,
        Title $categoryTitle,
        User $user = null,
        $comment,
        Title $pageTitle,
        $oldRevId,
        $newRevId,
        $lastTimestamp,
        $bot,
        $ip = '',
        $deleted = 0,
        $added = null
    ) {
        // Done in a backwards compatible way.
        $params = [
            'hidden-cat' => WikiCategoryPage::factory( $categoryTitle )->isHidden()
        ];
        if ( $added !== null ) {
            $params['added'] = $added;
        }
 
        $rc = new RecentChange;
        $rc->mTitle = $categoryTitle;
        $rc->mPerformer = $user;
        $rc->mAttribs = [
            'rc_timestamp' => $timestamp,
            'rc_namespace' => $categoryTitle->getNamespace(),
            'rc_title' => $categoryTitle->getDBkey(),
            'rc_type' => RC_CATEGORIZE,
            'rc_source' => self::SRC_CATEGORIZE,
            'rc_minor' => 0,
            'rc_cur_id' => $pageTitle->getArticleID(),
            'rc_user' => $user ? $user->getId() : 0,
            'rc_user_text' => $user ? $user->getName() : '',
            'rc_comment' => &$comment,
            'rc_comment_text' => &$comment,
            'rc_comment_data' => null,
            'rc_this_oldid' => $newRevId,
            'rc_last_oldid' => $oldRevId,
            'rc_bot' => $bot ? 1 : 0,
            'rc_ip' => self::checkIPAddress( $ip ),
            'rc_patrolled' => 1, // Always patrolled, just like log entries
            'rc_new' => 0, # obsolete
            'rc_old_len' => null,
            'rc_new_len' => null,
            'rc_deleted' => $deleted,
            'rc_logid' => 0,
            'rc_log_type' => null,
            'rc_log_action' => '',
            'rc_params' => serialize( $params )
        ];
 
        $rc->mExtra = [
            'prefixedDBkey' => $categoryTitle->getPrefixedDBkey(),
            'lastTimestamp' => $lastTimestamp,
            'oldSize' => 0,
            'newSize' => 0,
            'pageStatus' => 'changed'
        ];
 
        return $rc;
    }
 
    public function getParam( $name ) {
        $params = $this->parseParams();
        return isset( $params[$name] ) ? $params[$name] : null;
    }
 
    public function loadFromRow( $row ) {
        $this->mAttribs = get_object_vars( $row );
        $this->mAttribs['rc_timestamp'] = wfTimestamp( TS_MW, $this->mAttribs['rc_timestamp'] );
        // rc_deleted MUST be set
        $this->mAttribs['rc_deleted'] = $row->rc_deleted;
 
        if ( isset( $this->mAttribs['rc_ip'] ) ) {
            // Clean up CIDRs for Postgres per T164898. ("127.0.0.1" casts to "127.0.0.1/32")
            $n = strpos( $this->mAttribs['rc_ip'], '/' );
            if ( $n !== false ) {
                $this->mAttribs['rc_ip'] = substr( $this->mAttribs['rc_ip'], 0, $n );
            }
        }
 
        $comment = CommentStore::newKey( 'rc_comment' )
            // Legacy because $row probably came from self::selectFields()
            ->getCommentLegacy( wfGetDB( DB_REPLICA ), $row, true )->text;
        $this->mAttribs['rc_comment'] = &$comment;
        $this->mAttribs['rc_comment_text'] = &$comment;
        $this->mAttribs['rc_comment_data'] = null;
    }
 
    public function getAttribute( $name ) {
        if ( $name === 'rc_comment' ) {
            return CommentStore::newKey( 'rc_comment' )->getComment( $this->mAttribs, true )->text;
        }
        return isset( $this->mAttribs[$name] ) ? $this->mAttribs[$name] : null;
    }
 
    public function getAttributes() {
        return $this->mAttribs;
    }
 
    public function diffLinkTrail( $forceCur ) {
        if ( $this->mAttribs['rc_type'] == RC_EDIT ) {
            $trail = "curid=" . (int)( $this->mAttribs['rc_cur_id'] ) .
                "&oldid=" . (int)( $this->mAttribs['rc_last_oldid'] );
            if ( $forceCur ) {
                $trail .= '&diff=0';
            } else {
                $trail .= '&diff=' . (int)( $this->mAttribs['rc_this_oldid'] );
            }
        } else {
            $trail = '';
        }
 
        return $trail;
    }
 
    public function getCharacterDifference( $old = 0, $new = 0 ) {
        if ( $old === 0 ) {
            $old = $this->mAttribs['rc_old_len'];
        }
        if ( $new === 0 ) {
            $new = $this->mAttribs['rc_new_len'];
        }
        if ( $old === null || $new === null ) {
            return '';
        }
 
        return ChangesList::showCharacterDifference( $old, $new );
    }
 
    private static function checkIPAddress( $ip ) {
        global $wgRequest;
        if ( $ip ) {
            if ( !IP::isIPAddress( $ip ) ) {
                throw new MWException( "Attempt to write \"" . $ip .
                    "\" as an IP address into recent changes" );
            }
        } else {
            $ip = $wgRequest->getIP();
            if ( !$ip ) {
                $ip = '';
            }
        }
 
        return $ip;
    }
 
    public static function isInRCLifespan( $timestamp, $tolerance = 0 ) {
        global $wgRCMaxAge;
 
        return wfTimestamp( TS_UNIX, $timestamp ) > time() - $tolerance - $wgRCMaxAge;
    }
 
    public function parseParams() {
        $rcParams = $this->getAttribute( 'rc_params' );
 
        MediaWiki\suppressWarnings();
        $unserializedParams = unserialize( $rcParams );
        MediaWiki\restoreWarnings();
 
        return $unserializedParams;
    }
 
    public function addTags( $tags ) {
        if ( is_string( $tags ) ) {
            $this->tags[] = $tags;
        } else {
            $this->tags = array_merge( $tags, $this->tags );
        }
    }
}