LogFormatter.php

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<?php
class LogFormatter {
        // Audience options for viewing usernames, comments, and actions
        const FOR_PUBLIC = 1;
        const FOR_THIS_USER = 2;

        // Static->

        public static function newFromEntry( LogEntry $entry ) {
                global $wgLogActionsHandlers;
                $fulltype = $entry->getFullType();
                $wildcard = $entry->getType() . '/*';
                $handler = '';

                if ( isset( $wgLogActionsHandlers[$fulltype] ) ) {
                        $handler = $wgLogActionsHandlers[$fulltype];
                } elseif ( isset( $wgLogActionsHandlers[$wildcard] ) ) {
                        $handler = $wgLogActionsHandlers[$wildcard];
                }

                if ( $handler !== '' && is_string( $handler ) && class_exists( $handler ) ) {
                        return new $handler( $entry );
                }

                return new LegacyLogFormatter( $entry );
        }

        public static function newFromRow( $row ) {
                return self::newFromEntry( DatabaseLogEntry::newFromRow( $row ) );
        }

        // Nonstatic->

        protected $entry;

        protected $audience = self::FOR_PUBLIC;

        protected $linkFlood = false;

        protected $plaintext = false;

        protected $irctext = false;

        protected function __construct( LogEntry $entry ) {
                $this->entry = $entry;
                $this->context = RequestContext::getMain();
        }

        public function setContext( IContextSource $context ) {
                $this->context = $context;
        }

        public function setAudience( $audience ) {
                $this->audience = ( $audience == self::FOR_THIS_USER )
                        ? self::FOR_THIS_USER
                        : self::FOR_PUBLIC;
        }

        protected function canView( $field ) {
                if ( $this->audience == self::FOR_THIS_USER ) {
                        return LogEventsList::userCanBitfield(
                                $this->entry->getDeleted(), $field, $this->context->getUser() );
                } else {
                        return !$this->entry->isDeleted( $field );
                }
        }

        public function setShowUserToolLinks( $value ) {
                $this->linkFlood = $value;
        }

        public function getPlainActionText() {
                $this->plaintext = true;
                $text = $this->getActionText();
                $this->plaintext = false;
                return $text;
        }

        public function getIRCActionComment() {
                $actionComment = $this->getIRCActionText();
                $comment = $this->entry->getComment();

                if ( $comment != '' ) {
                        if ( $actionComment == '' ) {
                                $actionComment = $comment;
                        } else {
                                $actionComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $comment;
                        }
                }

                return $actionComment;
        }

        public function getIRCActionText() {
                $this->plaintext = true;
                $this->irctext = true;

                $entry = $this->entry;
                $parameters = $entry->getParameters();
                // @see LogPage::actionText()
                // Text of title the action is aimed at.
                $target = $entry->getTarget()->getPrefixedText();
                $text = null;
                switch( $entry->getType() ) {
                        case 'move':
                                switch( $entry->getSubtype() ) {
                                        case 'move':
                                                $movesource = $parameters['4::target'];
                                                $text = wfMessage( '1movedto2' )
                                                        ->rawParams( $target, $movesource )->inContentLanguage()->escaped();
                                                break;
                                        case 'move_redir':
                                                $movesource = $parameters['4::target'];
                                                $text = wfMessage( '1movedto2_redir' )
                                                        ->rawParams( $target, $movesource )->inContentLanguage()->escaped();
                                                break;
                                        case 'move-noredirect':
                                                break;
                                        case 'move_redir-noredirect':
                                                break;
                                }
                                break;

                        case 'delete':
                                switch( $entry->getSubtype() ) {
                                        case 'delete':
                                                $text = wfMessage( 'deletedarticle' )
                                                        ->rawParams( $target )->inContentLanguage()->escaped();
                                                break;
                                        case 'restore':
                                                $text = wfMessage( 'undeletedarticle' )
                                                        ->rawParams( $target )->inContentLanguage()->escaped();
                                                break;
                                        //case 'revision': // Revision deletion
                                        //case 'event': // Log deletion
                                                // see https://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/LogPage.php?&pathrev=97044&r1=97043&r2=97044
                                        //default:
                                }
                                break;

                        case 'patrol':
                                // https://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/PatrolLog.php?&pathrev=97495&r1=97494&r2=97495
                                // Create a diff link to the patrolled revision
                                if ( $entry->getSubtype() === 'patrol' ) {
                                        $diffLink = htmlspecialchars(
                                                wfMessage( 'patrol-log-diff', $parameters['4::curid'] )
                                                        ->inContentLanguage()->text() );
                                        $text = wfMessage( 'patrol-log-line', $diffLink, "[[$target]]", "" )
                                                ->inContentLanguage()->text();
                                } else {
                                        // broken??
                                }
                                break;

                        case 'protect':
                                switch( $entry->getSubtype() ) {
                                case 'protect':
                                        $text = wfMessage( 'protectedarticle' )
                                                ->rawParams( $target . ' ' . $parameters[0] )->inContentLanguage()->escaped();
                                        break;
                                case 'unprotect':
                                        $text = wfMessage( 'unprotectedarticle' )
                                                ->rawParams( $target )->inContentLanguage()->escaped();
                                        break;
                                case 'modify':
                                        $text = wfMessage( 'modifiedarticleprotection' )
                                                ->rawParams( $target . ' ' . $parameters[0] )->inContentLanguage()->escaped();
                                        break;
                                }
                                break;

                        case 'newusers':
                                switch( $entry->getSubtype() ) {
                                        case 'newusers':
                                        case 'create':
                                                $text = wfMessage( 'newuserlog-create-entry' )
                                                        ->inContentLanguage()->escaped();
                                                break;
                                        case 'create2':
                                        case 'byemail':
                                                $text = wfMessage( 'newuserlog-create2-entry' )
                                                        ->rawParams( $target )->inContentLanguage()->escaped();
                                                break;
                                        case 'autocreate':
                                                $text = wfMessage( 'newuserlog-autocreate-entry' )
                                                        ->inContentLanguage()->escaped();
                                                break;
                                }
                                break;

                        case 'upload':
                                switch( $entry->getSubtype() ) {
                                        case 'upload':
                                                $text = wfMessage( 'uploadedimage' )
                                                        ->rawParams( $target )->inContentLanguage()->escaped();
                                                break;
                                        case 'overwrite':
                                                $text = wfMessage( 'overwroteimage' )
                                                        ->rawParams( $target )->inContentLanguage()->escaped();
                                                break;
                                }
                                break;

                        case 'rights':
                                if ( count( $parameters['4::oldgroups'] ) ) {
                                        $oldgroups = implode( ', ', $parameters['4::oldgroups'] );
                                } else {
                                        $oldgroups = wfMessage( 'rightsnone' )->inContentLanguage()->escaped();
                                }
                                if ( count( $parameters['5::newgroups'] ) ) {
                                        $newgroups = implode( ', ', $parameters['5::newgroups'] );
                                } else {
                                        $newgroups = wfMessage( 'rightsnone' )->inContentLanguage()->escaped();
                                }
                                switch( $entry->getSubtype() ) {
                                        case 'rights':
                                                $text = wfMessage( 'rightslogentry' )
                                                        ->rawParams( $target, $oldgroups, $newgroups )->inContentLanguage()->escaped();
                                                break;
                                        case 'autopromote':
                                                $text = wfMessage( 'rightslogentry-autopromote' )
                                                        ->rawParams( $target, $oldgroups, $newgroups )->inContentLanguage()->escaped();
                                                break;
                                }
                                break;

                        // case 'suppress' --private log -- aaron  (sign your messages so we know who to blame in a few years :-D)
                        // default:
                }
                if( is_null( $text ) ) {
                        $text = $this->getPlainActionText();
                }

                $this->plaintext = false;
                $this->irctext = false;
                return $text;
        }

        public function getActionText() {
                if ( $this->canView( LogPage::DELETED_ACTION ) ) {
                        $element = $this->getActionMessage();
                        if ( $element instanceof Message ) {
                                $element = $this->plaintext ? $element->text() : $element->escaped();
                        }
                        if ( $this->entry->isDeleted( LogPage::DELETED_ACTION ) ) {
                                $element = $this->styleRestricedElement( $element );
                        }
                } else {
                        $performer = $this->getPerformerElement() . $this->msg( 'word-separator' )->text();
                        $element = $performer . $this->getRestrictedElement( 'rev-deleted-event' );
                }

                return $element;
        }

        protected function getActionMessage() {
                $message = $this->msg( $this->getMessageKey() );
                $message->params( $this->getMessageParameters() );
                return $message;
        }

        protected function getMessageKey() {
                $type = $this->entry->getType();
                $subtype = $this->entry->getSubtype();

                return "logentry-$type-$subtype";
        }

        public function getActionLinks() {
                return '';
        }

        protected function extractParameters() {
                $entry = $this->entry;
                $params = array();

                if ( $entry->isLegacy() ) {
                        foreach ( $entry->getParameters() as $index => $value ) {
                                $params[$index + 3] = $value;
                        }
                }

                // Filter out parameters which are not in format #:foo
                foreach ( $entry->getParameters() as $key => $value ) {
                        if ( strpos( $key, ':' ) === false ) {
                                continue;
                        }
                        list( $index, $type, ) = explode( ':', $key, 3 );
                        $params[$index - 1] = $this->formatParameterValue( $type, $value );
                }

                /* Message class doesn't like non consecutive numbering.
                 * Fill in missing indexes with empty strings to avoid
                 * incorrect renumbering.
                 */
                if ( count( $params ) ) {
                        $max = max( array_keys( $params ) );
                        for ( $i = 4; $i < $max; $i++ ) {
                                if ( !isset( $params[$i] ) ) {
                                        $params[$i] = '';
                                }
                        }
                }
                return $params;
        }

        protected function getMessageParameters() {
                if ( isset( $this->parsedParameters ) ) {
                        return $this->parsedParameters;
                }

                $entry = $this->entry;
                $params = $this->extractParameters();
                $params[0] = Message::rawParam( $this->getPerformerElement() );
                $params[1] = $this->canView( LogPage::DELETED_USER ) ? $entry->getPerformer()->getName() : '';
                $params[2] = Message::rawParam( $this->makePageLink( $entry->getTarget() ) );

                // Bad things happens if the numbers are not in correct order
                ksort( $params );
                return $this->parsedParameters = $params;
        }

        protected function formatParameterValue( $type, $value ) {
                $saveLinkFlood = $this->linkFlood;

                switch( strtolower( trim( $type ) ) ) {
                        case 'raw':
                                $value = Message::rawParam( $value );
                                break;
                        case 'msg':
                                $value = $this->msg( $value )->text();
                                break;
                        case 'msg-content':
                                $value = $this->msg( $value )->inContentLanguage()->text();
                                break;
                        case 'number':
                                $value = Message::numParam( $value );
                                break;
                        case 'user':
                                $user = User::newFromName( $value );
                                $value = $user->getName();
                                break;
                        case 'user-link':
                                $this->setShowUserToolLinks( false );

                                $user = User::newFromName( $value );
                                $value = Message::rawParam( $this->makeUserLink( $user ) );

                                $this->setShowUserToolLinks( $saveLinkFlood );
                                break;
                        case 'title':
                                $title = Title::newFromText( $value );
                                $value = $title->getPrefixedText();
                                break;
                        case 'title-link':
                                $title = Title::newFromText( $value );
                                $value = Message::rawParam( $this->makePageLink( $title ) );
                                break;
                        case 'plain':
                                // Plain text, nothing to do
                        default:
                                // Catch other types and use the old behavior (return as-is)
                }

                return $value;
        }

        protected function makePageLink( Title $title = null, $parameters = array() ) {
                if ( !$this->plaintext ) {
                        $link = Linker::link( $title, null, array(), $parameters );
                } else {
                        if ( !$title instanceof Title ) {
                                throw new MWException( "Expected title, got null" );
                        }
                        $link = '[[' . $title->getPrefixedText() . ']]';
                }
                return $link;
        }

        public function getPerformerElement() {
                if ( $this->canView( LogPage::DELETED_USER ) ) {
                        $performer = $this->entry->getPerformer();
                        $element = $this->makeUserLink( $performer );
                        if ( $this->entry->isDeleted( LogPage::DELETED_USER ) ) {
                                $element = $this->styleRestricedElement( $element );
                        }
                } else {
                        $element = $this->getRestrictedElement( 'rev-deleted-user' );
                }

                return $element;
        }

        public function getComment() {
                if ( $this->canView( LogPage::DELETED_COMMENT ) ) {
                        $comment = Linker::commentBlock( $this->entry->getComment() );
                        // No hard coded spaces thanx
                        $element = ltrim( $comment );
                        if ( $this->entry->isDeleted( LogPage::DELETED_COMMENT ) ) {
                                $element = $this->styleRestricedElement( $element );
                        }
                } else {
                        $element = $this->getRestrictedElement( 'rev-deleted-comment' );
                }

                return $element;
        }

        protected function getRestrictedElement( $message ) {
                if ( $this->plaintext ) {
                        return $this->msg( $message )->text();
                }

                $content = $this->msg( $message )->escaped();
                $attribs = array( 'class' => 'history-deleted' );
                return Html::rawElement( 'span', $attribs, $content );
        }

        protected function styleRestricedElement( $content ) {
                if ( $this->plaintext ) {
                        return $content;
                }
                $attribs = array( 'class' => 'history-deleted' );
                return Html::rawElement( 'span', $attribs, $content );
        }

        protected function msg( $key ) {
                return $this->context->msg( $key );
        }

        protected function makeUserLink( User $user ) {
                if ( $this->plaintext ) {
                        $element = $user->getName();
                } else {
                        $element = Linker::userLink(
                                $user->getId(),
                                $user->getName()
                        );

                        if ( $this->linkFlood ) {
                                $element .= Linker::userToolLinksRedContribs(
                                        $user->getId(),
                                        $user->getName(),
                                        $user->getEditCount()
                                );
                        }
                }
                return $element;
        }

        public function getPreloadTitles() {
                return array();
        }

        public function getMessageParametersForTesting() {
                // This function was added because getMessageParameters() is
                // protected and a change from protected to public caused
                // problems with extensions
                return $this->getMessageParameters();
        }

}

class LegacyLogFormatter extends LogFormatter {

        private $comment = null;

        private $revert = null;

        public function getComment() {
                if ( $this->comment === null ) {
                        $this->comment = parent::getComment();
                }

                // Make sure we execute the LogLine hook so that we immediately return
                // the correct value.
                if ( $this->revert === null ) {
                        $this->getActionLinks();
                }

                return $this->comment;
        }

        protected function getActionMessage() {
                $entry = $this->entry;
                $action = LogPage::actionText(
                        $entry->getType(),
                        $entry->getSubtype(),
                        $entry->getTarget(),
                        $this->plaintext ? null : $this->context->getSkin(),
                        (array)$entry->getParameters(),
                        !$this->plaintext // whether to filter [[]] links
                );

                $performer = $this->getPerformerElement();
                if ( !$this->irctext ) {
                        $action = $performer . $this->msg( 'word-separator' )->text() . $action;
                }

                return $action;
        }

        public function getActionLinks() {
                if ( $this->revert !== null ) {
                        return $this->revert;
                }

                if ( $this->entry->isDeleted( LogPage::DELETED_ACTION ) ) {
                        return $this->revert = '';
                }

                $title = $this->entry->getTarget();
                $type = $this->entry->getType();
                $subtype = $this->entry->getSubtype();

                // Show unblock/change block link
                if ( ( $type == 'block' || $type == 'suppress' ) && ( $subtype == 'block' || $subtype == 'reblock' ) ) {
                        if ( !$this->context->getUser()->isAllowed( 'block' ) ) {
                                return '';
                        }

                        $links = array(
                                Linker::linkKnown(
                                        SpecialPage::getTitleFor( 'Unblock', $title->getDBkey() ),
                                        $this->msg( 'unblocklink' )->escaped()
                                ),
                                Linker::linkKnown(
                                        SpecialPage::getTitleFor( 'Block', $title->getDBkey() ),
                                        $this->msg( 'change-blocklink' )->escaped()
                                )
                        );
                        return $this->msg( 'parentheses' )->rawParams(
                                $this->context->getLanguage()->pipeList( $links ) )->escaped();
                // Show change protection link
                } elseif ( $type == 'protect' && ( $subtype == 'protect' || $subtype == 'modify' || $subtype == 'unprotect' ) ) {
                        $links = array(
                                Linker::link( $title,
                                        $this->msg( 'hist' )->escaped(),
                                        array(),
                                        array(
                                                'action' => 'history',
                                                'offset' => $this->entry->getTimestamp()
                                        )
                                )
                        );
                        if ( $this->context->getUser()->isAllowed( 'protect' ) ) {
                                $links[] = Linker::linkKnown(
                                        $title,
                                        $this->msg( 'protect_change' )->escaped(),
                                        array(),
                                        array( 'action' => 'protect' )
                                );
                        }
                        return $this->msg( 'parentheses' )->rawParams(
                                $this->context->getLanguage()->pipeList( $links ) )->escaped();
                // Show unmerge link
                } elseif( $type == 'merge' && $subtype == 'merge' ) {
                        if ( !$this->context->getUser()->isAllowed( 'mergehistory' ) ) {
                                return '';
                        }

                        $params = $this->extractParameters();
                        $revert = Linker::linkKnown(
                                SpecialPage::getTitleFor( 'MergeHistory' ),
                                $this->msg( 'revertmerge' )->escaped(),
                                array(),
                                array(
                                        'target' => $params[3],
                                        'dest' => $title->getPrefixedDBkey(),
                                        'mergepoint' => $params[4]
                                )
                        );
                        return $this->msg( 'parentheses' )->rawParams( $revert )->escaped();
                }

                // Do nothing. The implementation is handled by the hook modifiying the
                // passed-by-ref parameters. This also changes the default value so that
                // getComment() and getActionLinks() do not call them indefinitely.
                $this->revert = '';

                // This is to populate the $comment member of this instance so that it
                // can be modified when calling the hook just below.
                if ( $this->comment === null ) {
                        $this->getComment();
                }

                $params = $this->entry->getParameters();

                wfRunHooks( 'LogLine', array( $type, $subtype, $title, $params,
                        &$this->comment, &$this->revert, $this->entry->getTimestamp() ) );

                return $this->revert;
        }
}

class MoveLogFormatter extends LogFormatter {
        public function getPreloadTitles() {
                $params = $this->extractParameters();
                return array( Title::newFromText( $params[3] ) );
        }

        protected function getMessageKey() {
                $key = parent::getMessageKey();
                $params = $this->getMessageParameters();
                if ( isset( $params[4] ) && $params[4] === '1' ) {
                        $key .= '-noredirect';
                }
                return $key;
        }

        protected function getMessageParameters() {
                $params = parent::getMessageParameters();
                $oldname = $this->makePageLink( $this->entry->getTarget(), array( 'redirect' => 'no' ) );
                $newname = $this->makePageLink( Title::newFromText( $params[3] ) );
                $params[2] = Message::rawParam( $oldname );
                $params[3] = Message::rawParam( $newname );
                return $params;
        }

        public function getActionLinks() {
                if ( $this->entry->isDeleted( LogPage::DELETED_ACTION ) // Action is hidden
                        || $this->entry->getSubtype() !== 'move'
                        || !$this->context->getUser()->isAllowed( 'move' ) )
                {
                        return '';
                }

                $params = $this->extractParameters();
                $destTitle = Title::newFromText( $params[3] );
                if ( !$destTitle ) {
                        return '';
                }

                $revert = Linker::linkKnown(
                        SpecialPage::getTitleFor( 'Movepage' ),
                        $this->msg( 'revertmove' )->escaped(),
                        array(),
                        array(
                                'wpOldTitle' => $destTitle->getPrefixedDBkey(),
                                'wpNewTitle' => $this->entry->getTarget()->getPrefixedDBkey(),
                                'wpReason'   => $this->msg( 'revertmove' )->inContentLanguage()->text(),
                                'wpMovetalk' => 0
                        )
                );
                return $this->msg( 'parentheses' )->rawParams( $revert )->escaped();
        }
}

class DeleteLogFormatter extends LogFormatter {
        protected function getMessageKey() {
                $key = parent::getMessageKey();
                if ( in_array( $this->entry->getSubtype(), array( 'event', 'revision' ) ) ) {
                        if ( count( $this->getMessageParameters() ) < 5 ) {
                                return "$key-legacy";
                        }
                }
                return $key;
        }

        protected function getMessageParameters() {
                if ( isset( $this->parsedParametersDeleteLog ) ) {
                        return $this->parsedParametersDeleteLog;
                }

                $params = parent::getMessageParameters();
                $subtype = $this->entry->getSubtype();
                if ( in_array( $subtype, array( 'event', 'revision' ) ) ) {
                        // $params[3] here is 'revision' for page revisions, 'oldimage' for file versions, or a comma-separated list of log_ids for log entries.
                        // $subtype here is 'revision' for page revisions and file versions, or 'event' for log entries.
                        if (
                                ( $subtype === 'event' && count( $params ) === 6 ) ||
                                ( $subtype === 'revision' && isset( $params[3] ) && ( $params[3] === 'revision' || $params[3] === 'oldimage' ) )
                        ) {
                                $paramStart = $subtype === 'revision' ? 4 : 3;

                                $old = $this->parseBitField( $params[$paramStart+1] );
                                $new = $this->parseBitField( $params[$paramStart+2] );
                                list( $hid, $unhid, $extra ) = RevisionDeleter::getChanges( $new, $old );
                                $changes = array();
                                foreach ( $hid as $v ) {
                                        $changes[] = $this->msg( "$v-hid" )->plain();
                                }
                                foreach ( $unhid as $v ) {
                                        $changes[] = $this->msg( "$v-unhid" )->plain();
                                }
                                foreach ( $extra as $v ) {
                                        $changes[] = $this->msg( $v )->plain();
                                }
                                $changeText = $this->context->getLanguage()->listToText( $changes );

                                $newParams = array_slice( $params, 0, 3 );
                                $newParams[3] = $changeText;
                                $count = count( explode( ',', $params[$paramStart] ) );
                                $newParams[4] = $this->context->getLanguage()->formatNum( $count );
                                return $this->parsedParametersDeleteLog = $newParams;
                        } else {
                                return $this->parsedParametersDeleteLog = array_slice( $params, 0, 3 );
                        }
                }

                return $this->parsedParametersDeleteLog = $params;
        }

        protected function parseBitField( $string ) {
                // Input is like ofield=2134 or just the number
                if ( strpos( $string, 'field=' ) === 1 ) {
                        list( , $field ) = explode( '=', $string );
                        return (int) $field;
                } else {
                        return (int) $string;
                }
        }

        public function getActionLinks() {
                $user = $this->context->getUser();
                if ( !$user->isAllowed( 'deletedhistory' ) || $this->entry->isDeleted( LogPage::DELETED_ACTION ) ) {
                        return '';
                }

                switch ( $this->entry->getSubtype() ) {
                case 'delete': // Show undelete link
                        if( $user->isAllowed( 'undelete' ) ) {
                                $message = 'undeletelink';
                        } else {
                                $message = 'undeleteviewlink';
                        }
                        $revert = Linker::linkKnown(
                                SpecialPage::getTitleFor( 'Undelete' ),
                                $this->msg( $message )->escaped(),
                                array(),
                                array( 'target' => $this->entry->getTarget()->getPrefixedDBkey() )
                        );
                        return $this->msg( 'parentheses' )->rawParams( $revert )->escaped();

                case 'revision': // If an edit was hidden from a page give a review link to the history
                        $params = $this->extractParameters();
                        if ( !isset( $params[3] ) || !isset( $params[4] ) ) {
                                return '';
                        }

                        // Different revision types use different URL params...
                        $key = $params[3];
                        // This is a CSV of the IDs
                        $ids = explode( ',', $params[4] );

                        $links = array();

                        // If there's only one item, we can show a diff link
                        if ( count( $ids ) == 1 ) {
                                // Live revision diffs...
                                if ( $key == 'oldid' || $key == 'revision' ) {
                                        $links[] = Linker::linkKnown(
                                                $this->entry->getTarget(),
                                                $this->msg( 'diff' )->escaped(),
                                                array(),
                                                array(
                                                        'diff' => intval( $ids[0] ),
                                                        'unhide' => 1
                                                )
                                        );
                                // Deleted revision diffs...
                                } elseif ( $key == 'artimestamp' || $key == 'archive' ) {
                                        $links[] = Linker::linkKnown(
                                                SpecialPage::getTitleFor( 'Undelete' ),
                                                $this->msg( 'diff' )->escaped(),
                                                array(),
                                                array(
                                                        'target'    => $this->entry->getTarget()->getPrefixedDBkey(),
                                                        'diff'      => 'prev',
                                                        'timestamp' => $ids[0]
                                                )
                                        );
                                }
                        }

                        // View/modify link...
                        $links[] = Linker::linkKnown(
                                SpecialPage::getTitleFor( 'Revisiondelete' ),
                                $this->msg( 'revdel-restore' )->escaped(),
                                array(),
                                array(
                                        'target' => $this->entry->getTarget()->getPrefixedText(),
                                        'type' => $key,
                                        'ids' => implode( ',', $ids ),
                                )
                        );

                        return $this->msg( 'parentheses' )->rawParams(
                                $this->context->getLanguage()->pipeList( $links ) )->escaped();

                case 'event': // Hidden log items, give review link
                        $params = $this->extractParameters();
                        if ( !isset( $params[3] ) ) {
                                return '';
                        }
                        // This is a CSV of the IDs
                        $query = $params[3];
                        // Link to each hidden object ID, $params[1] is the url param
                        $revert = Linker::linkKnown(
                                SpecialPage::getTitleFor( 'Revisiondelete' ),
                                $this->msg( 'revdel-restore' )->escaped(),
                                array(),
                                array(
                                        'target' => $this->entry->getTarget()->getPrefixedText(),
                                        'type' => 'logging',
                                        'ids' => $query
                                )
                        );
                        return $this->msg( 'parentheses' )->rawParams( $revert )->escaped();
                default:
                        return '';
                }
        }
}

class PatrolLogFormatter extends LogFormatter {
        protected function getMessageKey() {
                $key = parent::getMessageKey();
                $params = $this->getMessageParameters();
                if ( isset( $params[5] ) && $params[5] ) {
                        $key .= '-auto';
                }
                return $key;
        }

        protected function getMessageParameters() {
                $params = parent::getMessageParameters();

                $target = $this->entry->getTarget();
                $oldid = $params[3];
                $revision = $this->context->getLanguage()->formatNum( $oldid, true );

                if ( $this->plaintext ) {
                        $revlink = $revision;
                } elseif ( $target->exists() ) {
                        $query = array(
                                'oldid' => $oldid,
                                'diff' => 'prev'
                        );
                        $revlink = Linker::link( $target, htmlspecialchars( $revision ), array(), $query );
                } else {
                        $revlink = htmlspecialchars( $revision );
                }

                $params[3] = Message::rawParam( $revlink );
                return $params;
        }
}

class NewUsersLogFormatter extends LogFormatter {
        protected function getMessageParameters() {
                $params = parent::getMessageParameters();
                $subtype = $this->entry->getSubtype();
                if ( $subtype === 'create2' || $subtype === 'byemail' ) {
                        if ( isset( $params[3] ) ) {
                                $target = User::newFromId( $params[3] );
                        } else {
                                $target = User::newFromName( $this->entry->getTarget()->getText(), false );
                        }
                        $params[2] = Message::rawParam( $this->makeUserLink( $target ) );
                        $params[3] = $target->getName();
                }
                return $params;
        }

        public function getComment() {
                $timestamp = wfTimestamp( TS_MW, $this->entry->getTimestamp() );
                if ( $timestamp < '20080129000000' ) {
                        # Suppress $comment from old entries (before 2008-01-29),
                        # not needed and can contain incorrect links
                        return '';
                }
                return parent::getComment();
        }

        public function getPreloadTitles() {
                $subtype = $this->entry->getSubtype();
                if ( $subtype === 'create2' || $subtype === 'byemail' ) {
                        //add the user talk to LinkBatch for the userLink
                        return array( Title::makeTitle( NS_USER_TALK, $this->entry->getTarget()->getText() ) );
                }
                return array();
        }
}

class RightsLogFormatter extends LogFormatter {
        protected function makePageLink( Title $title = null, $parameters = array() ) {
                global $wgContLang, $wgUserrightsInterwikiDelimiter;

                if ( !$this->plaintext ) {
                        $text = $wgContLang->ucfirst( $title->getText() );
                        $parts = explode( $wgUserrightsInterwikiDelimiter, $text, 2 );

                        if ( count( $parts ) === 2 ) {
                                $titleLink = WikiMap::foreignUserLink( $parts[1], $parts[0],
                                        htmlspecialchars( $title->getPrefixedText() ) );

                                if ( $titleLink !== false ) {
                                        return $titleLink;
                                }
                        }
                }

                return parent::makePageLink( $title, $parameters );
        }

        protected function getMessageKey() {
                $key = parent::getMessageKey();
                $params = $this->getMessageParameters();
                if ( !isset( $params[3] ) && !isset( $params[4] ) ) {
                        $key .= '-legacy';
                }
                return $key;
        }

        protected function getMessageParameters() {
                $params = parent::getMessageParameters();

                // Really old entries
                if ( !isset( $params[3] ) && !isset( $params[4] ) ) {
                        return $params;
                }

                $oldGroups = $params[3];
                $newGroups = $params[4];

                // Less old entries
                if ( $oldGroups === '' ) {
                        $oldGroups = array();
                } elseif ( is_string( $oldGroups ) ) {
                        $oldGroups = array_map( 'trim', explode( ',', $oldGroups ) );
                }
                if ( $newGroups === '' ) {
                        $newGroups = array();
                } elseif ( is_string( $newGroups ) ) {
                        $newGroups = array_map( 'trim', explode( ',', $newGroups ) );
                }

                $userName = $this->entry->getTarget()->getText();
                if ( !$this->plaintext && count( $oldGroups ) ) {
                        foreach ( $oldGroups as &$group ) {
                                $group = User::getGroupMember( $group, $userName );
                        }
                }
                if ( !$this->plaintext && count( $newGroups ) ) {
                        foreach ( $newGroups as &$group ) {
                                $group = User::getGroupMember( $group, $userName );
                        }
                }

                $lang = $this->context->getLanguage();
                if ( count( $oldGroups ) ) {
                        $params[3] = $lang->listToText( $oldGroups );
                } else {
                        $params[3] = $this->msg( 'rightsnone' )->text();
                }
                if ( count( $newGroups ) ) {
                        // Array_values is used here because of bug 42211
                        // see use of array_unique in UserrightsPage::doSaveUserGroups on $newGroups.
                        $params[4] = $lang->listToText( array_values( $newGroups ) );
                } else {
                        $params[4] = $this->msg( 'rightsnone' )->text();
                }

                return $params;
        }
}