Add a way for packagers to override some installation details

[mediawiki.git] / includes / RecentChange.php

<?php
/**
 * Utility class for creating and accessing recent change entries.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */
 
/**
 * Utility class for creating new RC entries
 *
 * mAttribs:
 *  rc_id           id of the row in the recentchanges table
 *  rc_timestamp    time the entry was made
 *  rc_cur_time     timestamp on the cur row
 *  rc_namespace    namespace #
 *  rc_title        non-prefixed db key
 *  rc_type         is new entry, used to determine whether updating is necessary
 *  rc_minor        is minor
 *  rc_cur_id       page_id of associated page entry
 *  rc_user         user id who made the entry
 *  rc_user_text    user name who made the entry
 *  rc_comment      edit summary
 *  rc_this_oldid   rev_id associated with this entry (or zero)
 *  rc_last_oldid   rev_id associated with the entry before this one (or zero)
 *  rc_bot          is bot, hidden
 *  rc_ip           IP address of the user in dotted quad notation
 *  rc_new          obsolete, use rc_type==RC_NEW
 *  rc_patrolled    boolean whether or not someone has marked this edit as patrolled
 *  rc_old_len      integer byte length of the text before the edit
 *  rc_new_len      the same after the edit
 *  rc_deleted      partial deletion
 *  rc_logid        the log_id value for this log entry (or zero)
 *  rc_log_type     the log type (or null)
 *  rc_log_action   the log action (or null)
 *  rc_params       log params
 *
 * mExtra:
 *  prefixedDBkey   prefixed db key, used by external app via msg queue
 *  lastTimestamp   timestamp of previous entry, used in WHERE clause during update
 *  lang            the interwiki prefix, automatically set in save()
 *  oldSize         text size before the change
 *  newSize         text size after the change
 *
 * temporary:       not stored in the database
 *      notificationtimestamp
 *      numberofWatchingusers
 *
 * @todo document functions and variables
 */
class RecentChange {
        var $mAttribs = array(), $mExtra = array();

        /**
         * @var Title
         */
        var $mTitle = false;

        /**
         * @var Title
         */
        var $mMovedToTitle = false;
        var $numberofWatchingusers = 0 ; # Dummy to prevent error message in SpecialRecentchangeslinked
        var $notificationtimestamp;

        # Factory methods

        /**
         * @param $row
         * @return RecentChange
         */
        public static function newFromRow( $row ) {
                $rc = new RecentChange;
                $rc->loadFromRow( $row );
                return $rc;
        }

        /**
         * @param $row
         * @return RecentChange
         */
        public static function newFromCurRow( $row ) {
                $rc = new RecentChange;
                $rc->loadFromCurRow( $row );
                $rc->notificationtimestamp = false;
                $rc->numberofWatchingusers = false;
                return $rc;
        }

        /**
         * Obtain the recent change with a given rc_id value
         *
         * @param $rcid Int rc_id value to retrieve
         * @return RecentChange
         */
        public static function newFromId( $rcid ) {
                $dbr = wfGetDB( DB_SLAVE );
                $row = $dbr->selectRow( 'recentchanges', '*', array( 'rc_id' => $rcid ), __METHOD__ );
                if( $row !== false ) {
                        return self::newFromRow( $row );
                } else {
                        return null;
                }
        }

        /**
         * Find the first recent change matching some specific conditions
         *
         * @param $conds Array of conditions
         * @param $fname Mixed: override the method name in profiling/logs
         * @return RecentChange
         */
        public static function newFromConds( $conds, $fname = __METHOD__ ) {
                $dbr = wfGetDB( DB_SLAVE );
                $res = $dbr->select(
                        'recentchanges',
                        '*',
                        $conds,
                        $fname
                );
                if( $res instanceof ResultWrapper && $res->numRows() > 0 ) {
                        $row = $res->fetchObject();
                        $res->free();
                        return self::newFromRow( $row );
                }
                return null;
        }

        # Accessors

        /**
         * @param $attribs array
         */
        public function setAttribs( $attribs ) {
                $this->mAttribs = $attribs;
        }

        /**
         * @param $extra array
         */
        public function setExtra( $extra ) {
                $this->mExtra = $extra;
        }

        /**
         *
         * @return Title
         */
        public function &getTitle() {
                if( $this->mTitle === false ) {
                        $this->mTitle = Title::makeTitle( $this->mAttribs['rc_namespace'], $this->mAttribs['rc_title'] );
                        # Make sure the correct page ID is process cached
                        $this->mTitle->resetArticleID( $this->mAttribs['rc_cur_id'] );
                }
                return $this->mTitle;
        }

        /**
         * @return bool|\Title
         */
        public function getMovedToTitle() {
                if( $this->mMovedToTitle === false ) {
                        $this->mMovedToTitle = Title::makeTitle( $this->mAttribs['rc_moved_to_ns'],
                                $this->mAttribs['rc_moved_to_title'] );
                }
                return $this->mMovedToTitle;
        }

        /**
         * Writes the data in this object to the database
         * @param $noudp bool
         */
        public function save( $noudp = false ) {
                global $wgLocalInterwiki, $wgPutIPinRC, $wgContLang;

                $dbw = wfGetDB( DB_MASTER );
                if( !is_array($this->mExtra) ) {
                        $this->mExtra = array();
                }
                $this->mExtra['lang'] = $wgLocalInterwiki;

                if( !$wgPutIPinRC ) {
                        $this->mAttribs['rc_ip'] = '';
                }

                # If our database is strict about IP addresses, use NULL instead of an empty string
                if( $dbw->strictIPs() and $this->mAttribs['rc_ip'] == '' ) {
                        unset( $this->mAttribs['rc_ip'] );
                }

                # Make sure summary is truncated (whole multibyte characters)
                $this->mAttribs['rc_comment'] = $wgContLang->truncate( $this->mAttribs['rc_comment'], 255 );

                # Fixup database timestamps
                $this->mAttribs['rc_timestamp'] = $dbw->timestamp($this->mAttribs['rc_timestamp']);
                $this->mAttribs['rc_cur_time'] = $dbw->timestamp($this->mAttribs['rc_cur_time']);
                $this->mAttribs['rc_id'] = $dbw->nextSequenceValue( 'recentchanges_rc_id_seq' );

                ## If we are using foreign keys, an entry of 0 for the page_id will fail, so use NULL
                if( $dbw->cascadingDeletes() and $this->mAttribs['rc_cur_id']==0 ) {
                        unset( $this->mAttribs['rc_cur_id'] );
                }

                # Insert new row
                $dbw->insert( 'recentchanges', $this->mAttribs, __METHOD__ );

                # Set the ID
                $this->mAttribs['rc_id'] = $dbw->insertId();

                # Notify extensions
                wfRunHooks( 'RecentChange_save', array( &$this ) );

                # Notify external application via UDP
                if ( !$noudp ) {
                        $this->notifyRC2UDP();
                }

                # E-mail notifications
                global $wgUseEnotif, $wgShowUpdatedMarker, $wgUser;
                if( $wgUseEnotif || $wgShowUpdatedMarker ) {
                        // Users
                        if( $this->mAttribs['rc_user'] ) {
                                $editor = ($wgUser->getId() == $this->mAttribs['rc_user']) ?
                                        $wgUser : User::newFromID( $this->mAttribs['rc_user'] );
                        // Anons
                        } else {
                                $editor = ($wgUser->getName() == $this->mAttribs['rc_user_text']) ?
                                        $wgUser : User::newFromName( $this->mAttribs['rc_user_text'], false );
                        }
                        $title = Title::makeTitle( $this->mAttribs['rc_namespace'], $this->mAttribs['rc_title'] );

                        # @todo FIXME: This would be better as an extension hook
                        $enotif = new EmailNotification();
                        $status = $enotif->notifyOnPageChange( $editor, $title,
                                $this->mAttribs['rc_timestamp'],
                                $this->mAttribs['rc_comment'],
                                $this->mAttribs['rc_minor'],
                                $this->mAttribs['rc_last_oldid'] );
                }
        }

        public function notifyRC2UDP() {
                global $wgRC2UDPAddress, $wgRC2UDPOmitBots;
                # Notify external application via UDP
                if( $wgRC2UDPAddress && ( !$this->mAttribs['rc_bot'] || !$wgRC2UDPOmitBots ) ) {
                        self::sendToUDP( $this->getIRCLine() );
                }
        }

        /**
         * Send some text to UDP.
         * @see RecentChange::cleanupForIRC
         * @param $line String: text to send
         * @param $address String: defaults to $wgRC2UDPAddress.
         * @param $prefix String: defaults to $wgRC2UDPPrefix.
         * @param $port Int: defaults to $wgRC2UDPPort. (Since 1.17)
         * @return Boolean: success
         */
        public static function sendToUDP( $line, $address = '', $prefix = '', $port = '' ) {
                global $wgRC2UDPAddress, $wgRC2UDPPrefix, $wgRC2UDPPort;
                # Assume default for standard RC case
                $address = $address ? $address : $wgRC2UDPAddress;
                $prefix = $prefix ? $prefix : $wgRC2UDPPrefix;
                $port = $port ? $port : $wgRC2UDPPort;
                # Notify external application via UDP
                if( $address ) {
                        $conn = socket_create( AF_INET, SOCK_DGRAM, SOL_UDP );
                        if( $conn ) {
                                $line = $prefix . $line;
                                wfDebug( __METHOD__ . ": sending UDP line: $line\n" );
                                socket_sendto( $conn, $line, strlen($line), 0, $address, $port );
                                socket_close( $conn );
                                return true;
                        } else {
                                wfDebug( __METHOD__ . ": failed to create UDP socket\n" );
                        }
                }
                return false;
        }

        /**
         * Remove newlines, carriage returns and decode html entites
         * @param $text String
         * @return String
         */
        public static function cleanupForIRC( $text ) {
                return Sanitizer::decodeCharReferences( str_replace( array( "\n", "\r" ), array( "", "" ), $text ) );
        }

        /**
         * Mark a given change as patrolled
         *
         * @param $change Mixed: RecentChange or corresponding rc_id
         * @param $auto Boolean: for automatic patrol
         * @return Array See doMarkPatrolled(), or null if $change is not an existing rc_id
         */
        public static function markPatrolled( $change, $auto = false ) {
                global $wgUser;

                $change = $change instanceof RecentChange
                        ? $change
                        : RecentChange::newFromId($change);

                if( !$change instanceof RecentChange ) {
                        return null;
                }
                return $change->doMarkPatrolled( $wgUser, $auto );
        }

        /**
         * Mark this RecentChange as patrolled
         *
         * NOTE: Can also return 'rcpatroldisabled', 'hookaborted' and 'markedaspatrollederror-noautopatrol' as errors
         * @param $user User object doing the action
         * @param $auto Boolean: for automatic patrol
         * @return array of permissions errors, see Title::getUserPermissionsErrors()
         */
        public function doMarkPatrolled( User $user, $auto = false ) {
                global $wgUseRCPatrol, $wgUseNPPatrol;
                $errors = array();
                // If recentchanges patrol is disabled, only new pages
                // can be patrolled
                if( !$wgUseRCPatrol && ( !$wgUseNPPatrol || $this->getAttribute('rc_type') != RC_NEW ) ) {
                        $errors[] = array('rcpatroldisabled');
                }
                // Automatic patrol needs "autopatrol", ordinary patrol needs "patrol"
                $right = $auto ? 'autopatrol' : 'patrol';
                $errors = array_merge( $errors, $this->getTitle()->getUserPermissionsErrors( $right, $user ) );
                if( !wfRunHooks('MarkPatrolled', array($this->getAttribute('rc_id'), &$user, false)) ) {
                        $errors[] = array('hookaborted');
                }
                // Users without the 'autopatrol' right can't patrol their
                // own revisions
                if( $user->getName() == $this->getAttribute('rc_user_text') && !$user->isAllowed('autopatrol') ) {
                        $errors[] = array('markedaspatrollederror-noautopatrol');
                }
                if( $errors ) {
                        return $errors;
                }
                // If the change was patrolled already, do nothing
                if( $this->getAttribute('rc_patrolled') ) {
                        return array();
                }
                // Actually set the 'patrolled' flag in RC
                $this->reallyMarkPatrolled();
                // Log this patrol event
                PatrolLog::record( $this, $auto, $user );
                wfRunHooks( 'MarkPatrolledComplete', array($this->getAttribute('rc_id'), &$user, false) );
                return array();
        }

        /**
         * Mark this RecentChange patrolled, without error checking
         * @return Integer: number of affected rows
         */
        public function reallyMarkPatrolled() {
                $dbw = wfGetDB( DB_MASTER );
                $dbw->update(
                        'recentchanges',
                        array(
                                'rc_patrolled' => 1
                        ),
                        array(
                                'rc_id' => $this->getAttribute('rc_id')
                        ),
                        __METHOD__
                );
                return $dbw->affectedRows();
        }

        /**
         * Makes an entry in the database corresponding to an edit
         *
         * @param $timestamp
         * @param $title Title
         * @param $minor
         * @param $user User
         * @param $comment
         * @param $oldId
         * @param $lastTimestamp
         * @param $bot
         * @param $ip string
         * @param $oldSize int
         * @param $newSize int
         * @param $newId int
         * @param $patrol int
         * @return RecentChange
         */
        public static function notifyEdit( $timestamp, &$title, $minor, &$user, $comment, $oldId,
                $lastTimestamp, $bot, $ip='', $oldSize=0, $newSize=0, $newId=0, $patrol=0 ) {
                $rc = new RecentChange;
                $rc->mAttribs = array(
                        'rc_timestamp'  => $timestamp,
                        'rc_cur_time'   => $timestamp,
                        'rc_namespace'  => $title->getNamespace(),
                        'rc_title'      => $title->getDBkey(),
                        'rc_type'       => RC_EDIT,
                        'rc_minor'      => $minor ? 1 : 0,
                        'rc_cur_id'     => $title->getArticleID(),
                        'rc_user'       => $user->getId(),
                        'rc_user_text'  => $user->getName(),
                        'rc_comment'    => $comment,
                        'rc_this_oldid' => $newId,
                        'rc_last_oldid' => $oldId,
                        'rc_bot'        => $bot ? 1 : 0,
                        'rc_moved_to_ns' => 0,
                        'rc_moved_to_title' => '',
                        '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 =  array(
                        'prefixedDBkey' => $title->getPrefixedDBkey(),
                        'lastTimestamp' => $lastTimestamp,
                        'oldSize'       => $oldSize,
                        'newSize'       => $newSize,
                );
                $rc->save();
                return $rc;
        }

        /**
         * Makes an entry in the database corresponding to page creation
         * Note: the title object must be loaded with the new id using resetArticleID()
         * @todo Document parameters and return
         *
         * @param $timestamp
         * @param $title Title
         * @param $minor
         * @param $user User
         * @param $comment
         * @param $bot
         * @param $ip string
         * @param $size int
         * @param $newId int
         * @param $patrol int
         * @return RecentChange
         */
        public static function notifyNew( $timestamp, &$title, $minor, &$user, $comment, $bot,
                $ip='', $size=0, $newId=0, $patrol=0 ) {
                $rc = new RecentChange;
                $rc->mAttribs = array(
                        'rc_timestamp'      => $timestamp,
                        'rc_cur_time'       => $timestamp,
                        'rc_namespace'      => $title->getNamespace(),
                        'rc_title'          => $title->getDBkey(),
                        'rc_type'           => RC_NEW,
                        'rc_minor'          => $minor ? 1 : 0,
                        'rc_cur_id'         => $title->getArticleID(),
                        'rc_user'           => $user->getId(),
                        'rc_user_text'      => $user->getName(),
                        'rc_comment'        => $comment,
                        'rc_this_oldid'     => $newId,
                        'rc_last_oldid'     => 0,
                        'rc_bot'            => $bot ? 1 : 0,
                        'rc_moved_to_ns'    => 0,
                        'rc_moved_to_title' => '',
                        '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 =  array(
                        'prefixedDBkey' => $title->getPrefixedDBkey(),
                        'lastTimestamp' => 0,
                        'oldSize' => 0,
                        'newSize' => $size
                );
                $rc->save();
                return $rc;
        }

        /**
         * @param $timestamp
         * @param $title
         * @param $user
         * @param $actionComment
         * @param $ip string
         * @param $type
         * @param $action
         * @param $target
         * @param $logComment
         * @param $params
         * @param $newId int
         * @param $actionCommentIRC string
         * @return bool
         */
        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;
        }

        /**
         * @param $timestamp
         * @param $title Title
         * @param $user User
         * @param $actionComment
         * @param $ip string
         * @param $type
         * @param $action
         * @param $target Title
         * @param $logComment
         * @param $params
         * @param $newId int
         * @param $actionCommentIRC string
         * @return RecentChange
         */
        public static function newLogEntry( $timestamp, &$title, &$user, $actionComment, $ip,
                $type, $action, $target, $logComment, $params, $newId=0, $actionCommentIRC='' ) {
                global $wgRequest;

                $rc = new RecentChange;
                $rc->mAttribs = array(
                        'rc_timestamp'  => $timestamp,
                        'rc_cur_time'   => $timestamp,
                        'rc_namespace'  => $target->getNamespace(),
                        'rc_title'      => $target->getDBkey(),
                        'rc_type'       => RC_LOG,
                        'rc_minor'      => 0,
                        'rc_cur_id'     => $target->getArticleID(),
                        'rc_user'       => $user->getId(),
                        'rc_user_text'  => $user->getName(),
                        'rc_comment'    => $logComment,
                        'rc_this_oldid' => 0,
                        'rc_last_oldid' => 0,
                        'rc_bot'        => $user->isAllowed( 'bot' ) ? $wgRequest->getBool( 'bot', true ) : 0,
                        'rc_moved_to_ns' => 0,
                        'rc_moved_to_title' => '',
                        'rc_ip'         => self::checkIPAddress( $ip ),
                        'rc_patrolled'  => 1,
                        '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 =  array(
                        'prefixedDBkey' => $title->getPrefixedDBkey(),
                        'lastTimestamp' => 0,
                        'actionComment' => $actionComment, // the comment appended to the action, passed from LogPage
                        'actionCommentIRC' => $actionCommentIRC
                );
                return $rc;
        }

        /**
         * Initialises the members of this object from a mysql row object
         *
         * @param $row
         */
        public function loadFromRow( $row ) {
                $this->mAttribs = get_object_vars( $row );
                $this->mAttribs['rc_timestamp'] = wfTimestamp(TS_MW, $this->mAttribs['rc_timestamp']);
                $this->mAttribs['rc_deleted'] = $row->rc_deleted; // MUST be set
        }

        /**
         * Makes a pseudo-RC entry from a cur row
         *
         * @param $row
         */
        public function loadFromCurRow( $row ) {
                $this->mAttribs = array(
                        'rc_timestamp' => wfTimestamp(TS_MW, $row->rev_timestamp),
                        'rc_cur_time' => $row->rev_timestamp,
                        'rc_user' => $row->rev_user,
                        'rc_user_text' => $row->rev_user_text,
                        'rc_namespace' => $row->page_namespace,
                        'rc_title' => $row->page_title,
                        'rc_comment' => $row->rev_comment,
                        'rc_minor' => $row->rev_minor_edit ? 1 : 0,
                        'rc_type' => $row->page_is_new ? RC_NEW : RC_EDIT,
                        'rc_cur_id' => $row->page_id,
                        'rc_this_oldid' => $row->rev_id,
                        'rc_last_oldid' => isset($row->rc_last_oldid) ? $row->rc_last_oldid : 0,
                        'rc_bot'        => 0,
                        'rc_moved_to_ns'        => 0,
                        'rc_moved_to_title'     => '',
                        'rc_ip' => '',
                        'rc_id' => $row->rc_id,
                        'rc_patrolled' => $row->rc_patrolled,
                        'rc_new' => $row->page_is_new, # obsolete
                        'rc_old_len' => $row->rc_old_len,
                        'rc_new_len' => $row->rc_new_len,
                        'rc_params' => isset($row->rc_params) ? $row->rc_params : '',
                        'rc_log_type' => isset($row->rc_log_type) ? $row->rc_log_type : null,
                        'rc_log_action' => isset($row->rc_log_action) ? $row->rc_log_action : null,
                        'rc_log_id' => isset($row->rc_log_id) ? $row->rc_log_id: 0,
                        'rc_deleted' => $row->rc_deleted // MUST be set
                );
        }

        /**
         * Get an attribute value
         *
         * @param $name String Attribute name
         * @return mixed
         */
        public function getAttribute( $name ) {
                return isset( $this->mAttribs[$name] ) ? $this->mAttribs[$name] : null;
        }

        /**
         * @return array
         */
        public function getAttributes() {
                return $this->mAttribs;
        }

        /**
         * Gets the end part of the diff URL associated with this object
         * Blank if no diff link should be displayed
         * @param $forceCur
         * @return string
         */
        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;
        }

        /**
         * @return string
         */
        public function getIRCLine() {
                global $wgUseRCPatrol, $wgUseNPPatrol, $wgRC2UDPInterwikiPrefix, $wgLocalInterwiki,
                        $wgCanonicalServer, $wgScript;

                if( $this->mAttribs['rc_type'] == RC_LOG ) {
                        // Don't use SpecialPage::getTitleFor, backwards compatibility with
                        // IRC API which expects "Log".
                        $titleObj = Title::newFromText( 'Log/' . $this->mAttribs['rc_log_type'], NS_SPECIAL );
                } else {
                        $titleObj =& $this->getTitle();
                }
                $title = $titleObj->getPrefixedText();
                $title = self::cleanupForIRC( $title );

                if( $this->mAttribs['rc_type'] == RC_LOG ) {
                        $url = '';
                } else {
                        $url = $wgCanonicalServer . $wgScript;
                        if( $this->mAttribs['rc_type'] == RC_NEW ) {
                                $query = '?oldid=' . $this->mAttribs['rc_this_oldid'];
                        } else {
                                $query = '?diff=' . $this->mAttribs['rc_this_oldid'] . '&oldid=' . $this->mAttribs['rc_last_oldid'];
                        }
                        if ( $wgUseRCPatrol || ( $this->mAttribs['rc_type'] == RC_NEW && $wgUseNPPatrol ) ) {
                                $query .= '&rcid=' . $this->mAttribs['rc_id'];
                        }
                        // HACK: We need this hook for WMF's secure server setup
                        wfRunHooks( 'IRCLineURL', array( &$url, &$query ) );
                        $url .= $query;
                }

                if( $this->mAttribs['rc_old_len'] !== null && $this->mAttribs['rc_new_len'] !== null ) {
                        $szdiff = $this->mAttribs['rc_new_len'] - $this->mAttribs['rc_old_len'];
                        if($szdiff < -500) {
                                $szdiff = "\002$szdiff\002";
                        } elseif($szdiff >= 0) {
                                $szdiff = '+' . $szdiff ;
                        }
                        // @todo i18n with parentheses in content language?
                        $szdiff = '(' . $szdiff . ')' ;
                } else {
                        $szdiff = '';
                }

                $user = self::cleanupForIRC( $this->mAttribs['rc_user_text'] );

                if ( $this->mAttribs['rc_type'] == RC_LOG ) {
                        $targetText = $this->getTitle()->getPrefixedText();
                        $comment = self::cleanupForIRC( str_replace( "[[$targetText]]", "[[\00302$targetText\00310]]", $this->mExtra['actionCommentIRC'] ) );
                        $flag = $this->mAttribs['rc_log_action'];
                } else {
                        $comment = self::cleanupForIRC( $this->mAttribs['rc_comment'] );
                        $flag = '';
                        if ( !$this->mAttribs['rc_patrolled'] && ( $wgUseRCPatrol || $this->mAttribs['rc_new'] && $wgUseNPPatrol ) ) {
                                $flag .= '!';
                        }
                        $flag .= ( $this->mAttribs['rc_new'] ? "N" : "" ) . ( $this->mAttribs['rc_minor'] ? "M" : "" ) . ( $this->mAttribs['rc_bot'] ? "B" : "" );
                }

                if ( $wgRC2UDPInterwikiPrefix === true && $wgLocalInterwiki !== false ) {
                        $prefix = $wgLocalInterwiki;
                } elseif ( $wgRC2UDPInterwikiPrefix ) {
                        $prefix = $wgRC2UDPInterwikiPrefix;
                } else {
                        $prefix = false;
                }
                if ( $prefix !== false ) {
                        $titleString = "\00314[[\00303$prefix:\00307$title\00314]]";
                } else {
                        $titleString = "\00314[[\00307$title\00314]]";
                }

                # see http://www.irssi.org/documentation/formats for some colour codes. prefix is \003,
                # no colour (\003) switches back to the term default
                $fullString = "$titleString\0034 $flag\00310 " .
                                          "\00302$url\003 \0035*\003 \00303$user\003 \0035*\003 $szdiff \00310$comment\003\n";

                return $fullString;
        }

        /**
         * Returns the change size (HTML).
         * The lengths can be given optionally.
         * @param $old int
         * @param $new int
         * @return string
         */
        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;
        }
}