* Filter out duplicated url parameters

[mediawiki.git] / includes / specials / SpecialRevisiondelete.php

<?php
/**
 * Special page allowing users with the appropriate permissions to view
 * and hide revisions. Log items can also be hidden.
 *
 * @file
 * @ingroup SpecialPage
 */

class SpecialRevisionDelete extends UnlistedSpecialPage {

        public function __construct() {
                parent::__construct( 'Revisiondelete', 'deleterevision' );
                $this->includable( false ); // paranoia
        }

        public function execute( $par ) {
                global $wgOut, $wgUser, $wgRequest;
                if( !$wgUser->isAllowed( 'deleterevision' ) ) {
                        return $wgOut->permissionRequired( 'deleterevision' );
                } else if( wfReadOnly() ) {
                        return $wgOut->readOnlyPage();
                }
                $this->skin =& $wgUser->getSkin();
                $this->setHeaders();
                $this->outputHeader();
                $this->wasPosted = $wgRequest->wasPosted();
                # Set title and such
                $this->target = $wgRequest->getText( 'target' );
                # Handle our many different possible input types.
                # Use CVS, since the cgi handling will break on arrays.
                $this->oldids = explode( ',', $wgRequest->getVal('oldid') );
                $this->oldids = array_unique( array_filter($this->oldids) );
                $this->artimestamps = explode( ',', $wgRequest->getVal('artimestamp') );
                $this->artimestamps = array_unique( array_filter($this->artimestamps) );
                $this->logids = explode( ',', $wgRequest->getVal('logid') );
                $this->logids = array_unique( array_filter($this->logids) );
                $this->oldimgs = explode( ',', $wgRequest->getVal('oldimage') );
                $this->oldimgs = array_unique( array_filter($this->oldimgs) );
                $this->fileids = explode( ',', $wgRequest->getVal('fileid') );
                $this->fileids = array_unique( array_filter($this->fileids) );
                # For reviewing deleted files...
                $this->file = $wgRequest->getVal( 'file' );
                # Only one target set at a time please!
                $types = (bool)$this->file + (bool)$this->oldids + (bool)$this->logids
                        + (bool)$this->artimestamps + (bool)$this->fileids + (bool)$this->oldimgs;
                # No targets?
                if( $types == 0 ) {
                        return $wgOut->showErrorPage( 'revdelete-nooldid-title', 'revdelete-nooldid-text' );
                # Too many targets?
                } else if( $types > 1 ) {
                        return $wgOut->showErrorPage( 'revdelete-toomanytargets-title', 'revdelete-toomanytargets-text' );
                }
                $this->page = Title::newFromUrl( $this->target );
                $this->contextPage = Title::newFromUrl( $wgRequest->getText( 'page' ) );
                # If we have revisions, get the title from the first one
                # since they should all be from the same page. This allows 
                # for more flexibility with page moves...
                if( count($this->oldids) > 0 ) {
                        $rev = Revision::newFromId( $this->oldids[0] );
                        $this->page = $rev ? $rev->getTitle() : $this->page;
                }
                # We need a target page!
                if( is_null($this->page) ) {
                        return $wgOut->addWikiMsg( 'undelete-header' );
                }
                # For reviewing deleted files...show it now if allowed
                if( $this->file ) {
                        return $this->tryShowFile( $this->file );
                }
                # Logs must have a type given
                if( $this->logids && !strpos($this->page->getDBKey(),'/') ) {
                        return $wgOut->showErrorPage( 'revdelete-nologtype-title', 'revdelete-nologtype-text' );
                }
                # Give a link to the logs/hist for this page
                $this->showConvenienceLinks();
                # Lock the operation and the form context
                $this->secureOperation();
                # Either submit or create our form
                if( $this->wasPosted ) {
                        $this->submit( $wgRequest );
                } else if( $this->deleteKey == 'oldid' || $this->deleteKey == 'artimestamp' ) {
                        $this->showRevs();
                } else if( $this->deleteKey == 'fileid' || $this->deleteKey == 'oldimage' ) {
                        $this->showImages();
                } else if( $this->deleteKey == 'logid' ) {
                        $this->showLogItems();
                }
                list($qc,$lim) = $this->getLogQueryCond();
                # Show relevant lines from the deletion log
                $wgOut->addHTML( "<h2>" . htmlspecialchars( LogPage::logName( 'delete' ) ) . "</h2>\n" );
                LogEventsList::showLogExtract( $wgOut, 'delete', $this->page->getPrefixedText(), '', $lim, $qc );
                # Show relevant lines from the suppression log
                if( $wgUser->isAllowed( 'suppressionlog' ) ) {
                        $wgOut->addHTML( "<h2>" . htmlspecialchars( LogPage::logName( 'suppress' ) ) . "</h2>\n" );
                        LogEventsList::showLogExtract( $wgOut, 'suppress', $this->page->getPrefixedText(), '', $lim, $qc );
                }
        }
        
        private function showConvenienceLinks() {
                global $wgOut, $wgUser;
                # Give a link to the logs/hist for this page
                if( !is_null($this->page) && $this->page->getNamespace() > -1 ) {
                        $links = array();
                        $logtitle = SpecialPage::getTitleFor( 'Log' );
                        $links[] = $this->skin->makeKnownLinkObj( $logtitle, wfMsgHtml( 'viewpagelogs' ),
                                wfArrayToCGI( array( 'page' => $this->page->getPrefixedUrl() ) ) );
                        # Give a link to the page history
                        $links[] = $this->skin->makeKnownLinkObj( $this->page, wfMsgHtml( 'pagehist' ),
                                wfArrayToCGI( array( 'action' => 'history' ) ) );
                        # Link to deleted edits
                        if( $wgUser->isAllowed('undelete') ) {
                                $undelete = SpecialPage::getTitleFor( 'Undelete' );
                                $links[] = $this->skin->makeKnownLinkObj( $undelete, wfMsgHtml( 'deletedhist' ),
                                        wfArrayToCGI( array( 'target' => $this->page->getPrefixedDBkey() ) ) );
                        }
                        # Logs themselves don't have histories or archived revisions
                        $wgOut->setSubtitle( '<p>'.implode($links,' / ').'</p>' );
                }
        }
        
        private function getLogQueryCond() {
                $ids = $safeIds = array();
                $action = 'revision';
                $limit = 25; // default
                switch( $this->deleteKey ) {
                        case 'oldid':
                                $ids = $this->oldids;
                                break;
                        case 'artimestamp':
                                $ids = $this->artimestamps;
                                break;
                        case 'oldimage':
                                $ids = $this->oldimgs;
                                break;
                        case 'fileid':
                                $ids = $this->fileids;
                                break;
                        case 'logid':
                                $ids = $this->logids;
                                $action = 'event';
                                break;
                }
                // Revision delete logs
                $conds = array( 'log_action' => $action );
                // Just get the whole log if there are a lot if items
                if( count($ids) > $limit )
                        return array($conds,$limit);
                // Digit chars only
                foreach( $ids as $id ) {
                        if( preg_match( '/^\d+$/', $id, $m ) ) {
                                $safeIds[] = $m[0];
                        }
                }
                // Optimization for logs
                if( $action == 'event' ) {
                        $dbr = wfGetDB( DB_SLAVE );
                        # Get the timestamp of the first item
                        $first = $dbr->selectField( 'logging', 'log_timestamp',
                                array('log_id' => $safeIds), __METHOD__, array('ORDER BY' => 'log_id') );
                        # If there are no items, then stop here
                        if( $first == false ) {
                                $conds = array('1=0');
                                return array($conds,$limit);
                        }
                        # The event was be hidden after it was made
                        $conds[] = 'log_timestamp > '.$dbr->addQuotes($first); // type,time index
                }
                // Format is <id1,id2,i3...>
                if( count($safeIds) ) {
                        $conds[] = "log_params RLIKE '(^|\n|,)(".implode('|',$safeIds).")(,|\n|$)'";
                } else {
                        $conds = array('1=0');
                }
                return array($conds,$limit);
        }

        private function secureOperation() {
                global $wgUser;
                $this->deleteKey = '';
                // At this point, we should only have one of these
                if( $this->oldids ) {
                        $this->revisions = $this->oldids;
                        $hide_content_name = array( 'revdelete-hide-text', 'wpHideText', Revision::DELETED_TEXT );
                        $this->deleteKey = 'oldid';
                } else if( $this->artimestamps ) {
                        $this->archrevs = $this->artimestamps;
                        $hide_content_name = array( 'revdelete-hide-text', 'wpHideText', Revision::DELETED_TEXT );
                        $this->deleteKey = 'artimestamp';
                } else if( $this->oldimgs ) {
                        $this->ofiles = $this->oldimgs;
                        $hide_content_name = array( 'revdelete-hide-image', 'wpHideImage', File::DELETED_FILE );
                        $this->deleteKey = 'oldimage';
                } else if( $this->fileids ) {
                        $this->afiles = $this->fileids;
                        $hide_content_name = array( 'revdelete-hide-image', 'wpHideImage', File::DELETED_FILE );
                        $this->deleteKey = 'fileid';
                } else if( $this->logids ) {
                        $this->events = $this->logids;
                        $hide_content_name = array( 'revdelete-hide-name', 'wpHideName', LogPage::DELETED_ACTION );
                        $this->deleteKey = 'logid';
                }
                // Our checkbox messages depends one what we are doing,
                // e.g. we don't hide "text" for logs or images
                $this->checks = array(
                        $hide_content_name,
                        array( 'revdelete-hide-comment', 'wpHideComment', Revision::DELETED_COMMENT ),
                        array( 'revdelete-hide-user', 'wpHideUser', Revision::DELETED_USER )
                );
                if( $wgUser->isAllowed('suppressrevision') ) {
                        $this->checks[] = array( 'revdelete-hide-restricted',
                                'wpHideRestricted', Revision::DELETED_RESTRICTED );
                }
        }

        /**
         * Show a deleted file version requested by the visitor.
         */
        private function tryShowFile( $key ) {
                global $wgOut, $wgRequest;
                $oimage = RepoGroup::singleton()->getLocalRepo()->newFromArchiveName( $this->page, $key );
                $oimage->load();
                // Check if user is allowed to see this file
                if( !$oimage->userCan(File::DELETED_FILE) ) {
                        $wgOut->permissionRequired( 'suppressrevision' );
                } else {
                        $wgOut->disable();
                        # We mustn't allow the output to be Squid cached, otherwise
                        # if an admin previews a deleted image, and it's cached, then
                        # a user without appropriate permissions can toddle off and
                        # nab the image, and Squid will serve it
                        $wgRequest->response()->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
                        $wgRequest->response()->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
                        $wgRequest->response()->header( 'Pragma: no-cache' );
                        # Stream the file to the client
                        $store = FileStore::get( 'deleted' );
                        $store->stream( $key );
                }
        }

        /**
         * This lets a user set restrictions for live and archived revisions
         */
        private function showRevs() {
                global $wgOut, $wgUser;
                $UserAllowed = true;

                $count = ($this->deleteKey == 'oldid') ?
                        count($this->revisions) : count($this->archrevs);
                $wgOut->addWikiMsg( 'revdelete-selected', $this->page->getPrefixedText(), $count );

                $bitfields = 0;
                $wgOut->addHTML( "<ul>" );

                $where = $revObjs = array();
                $dbr = wfGetDB( DB_MASTER );
                
                $revisions = 0;
                // Live revisions...
                if( $this->deleteKey == 'oldid' ) {
                        // Run through and pull all our data in one query
                        foreach( $this->revisions as $revid ) {
                                $where[] = intval($revid);
                        }
                        $result = $dbr->select( array('revision','page'), '*',
                                array(
                                        'rev_page' => $this->page->getArticleID(),
                                        'rev_id'   => $where,
                                        'rev_page = page_id'
                                ),
                                __METHOD__
                        );
                        while( $row = $dbr->fetchObject( $result ) ) {
                                $revObjs[$row->rev_id] = new Revision( $row );
                        }
                        foreach( $this->revisions as $revid ) {
                                if( !isset($revObjs[$revid]) ) continue; // Must exist
                                // Check if the revision was Oversighted
                                if( !$revObjs[$revid]->userCan(Revision::DELETED_RESTRICTED) ) {
                                        if( !$this->wasPosted ) {
                                                return $wgOut->permissionRequired( 'suppressrevision' );
                                        }
                                        $UserAllowed = false;
                                }
                                $revisions++;
                                $wgOut->addHTML( $this->historyLine( $revObjs[$revid] ) );
                                $bitfields |= $revObjs[$revid]->mDeleted;
                        }
                // The archives...
                } else {
                        // Run through and pull all our data in one query
                        foreach( $this->archrevs as $timestamp ) {
                                $where[] = $dbr->timestamp( $timestamp );
                        }
                        $result = $dbr->select( 'archive', '*',
                                array(
                                        'ar_namespace' => $this->page->getNamespace(),
                                        'ar_title'     => $this->page->getDBKey(),
                                        'ar_timestamp' => $where
                                ),
                                __METHOD__
                        );
                        while( $row = $dbr->fetchObject( $result ) ) {
                                $timestamp = wfTimestamp( TS_MW, $row->ar_timestamp );
                                $revObjs[$timestamp] = new Revision( array(
                                        'page'       => $this->page->getArticleId(),
                                        'id'         => $row->ar_rev_id,
                                        'text'       => $row->ar_text_id,
                                        'comment'    => $row->ar_comment,
                                        'user'       => $row->ar_user,
                                        'user_text'  => $row->ar_user_text,
                                        'timestamp'  => $timestamp,
                                        'minor_edit' => $row->ar_minor_edit,
                                        'text_id'    => $row->ar_text_id,
                                        'deleted'    => $row->ar_deleted,
                                        'len'        => $row->ar_len) );
                        }
                        foreach( $this->archrevs as $timestamp ) {
                                if( !isset($revObjs[$timestamp]) ) {
                                        continue;
                                } else if( !$revObjs[$timestamp]->userCan(Revision::DELETED_RESTRICTED) ) {
                                // If a rev is hidden from sysops
                                        if( !$this->wasPosted ) {
                                                return $wgOut->permissionRequired( 'suppressrevision' );
                                        }
                                        $UserAllowed = false;
                                }
                                $revisions++;
                                $wgOut->addHTML( $this->historyLine( $revObjs[$timestamp] ) );
                                $bitfields |= $revObjs[$timestamp]->mDeleted;
                        }
                }
                if( !$revisions ) {
                        return $wgOut->showErrorPage( 'revdelete-nooldid-title', 'revdelete-nooldid-text' );
                }
                
                $wgOut->addHTML( "</ul>" );
                // Explanation text
                $this->addUsageText();

                // Normal sysops can always see what they did, but can't always change it
                if( !$UserAllowed ) return;

                $items = array(
                        Xml::inputLabel( wfMsg( 'revdelete-log' ), 'wpReason', 'wpReason', 60 ),
                        Xml::submitButton( wfMsg( 'revdelete-submit' ) )
                );
                $hidden = array(
                        Xml::hidden( 'wpEditToken', $wgUser->editToken() ),
                        Xml::hidden( 'target', $this->page->getPrefixedText() ),
                        Xml::hidden( 'type', $this->deleteKey )
                );
                if( $this->deleteKey == 'oldid' ) {
                        $hidden[] = Xml::hidden( 'oldid', implode(',',$this->oldids) );
                } else {
                        $hidden[] = Xml::hidden( 'artimestamp', implode(',',$this->artimestamps) );
                }
                $wgOut->addHTML(
                        Xml::openElement( 'form', array( 'method' => 'post',
                                'action' => $this->getTitle()->getLocalUrl( 'action=submit' ), 
                                'id' => 'mw-revdel-form-revisions' ) ) .
                        Xml::openElement( 'fieldset' ) .
                        xml::element( 'legend', null,  wfMsg( 'revdelete-legend' ) )
                );

                $wgOut->addHTML( $this->buildCheckBoxes( $bitfields ) );
                foreach( $items as $item ) {
                        $wgOut->addHTML( Xml::tags( 'p', null, $item ) );
                }
                foreach( $hidden as $item ) {
                        $wgOut->addHTML( $item );
                }
                $wgOut->addHTML(
                        Xml::closeElement( 'fieldset' ) .
                        Xml::closeElement( 'form' ) . "\n"
                );
        }

        /**
         * This lets a user set restrictions for archived images
         */
        private function showImages() {
                global $wgOut, $wgUser, $wgLang;
                $UserAllowed = true;

                $count = ($this->deleteKey == 'oldimage') ? count($this->ofiles) : count($this->afiles);
                $wgOut->addWikiMsg( 'revdelete-selected', $this->page->getPrefixedText(),
                        $wgLang->formatNum($count) );

                $bitfields = 0;
                $wgOut->addHTML( "<ul>" );

                $where = $filesObjs = array();
                $dbr = wfGetDB( DB_MASTER );
                // Live old revisions...
                $revisions = 0;
                if( $this->deleteKey == 'oldimage' ) {
                        // Run through and pull all our data in one query
                        foreach( $this->ofiles as $timestamp ) {
                                $where[] = $timestamp.'!'.$this->page->getDBKey();
                        }
                        $result = $dbr->select( 'oldimage', '*',
                                array(
                                        'oi_name'         => $this->page->getDBKey(),
                                        'oi_archive_name' => $where
                                ),
                                __METHOD__
                        );
                        while( $row = $dbr->fetchObject( $result ) ) {
                                $filesObjs[$row->oi_archive_name] = RepoGroup::singleton()->getLocalRepo()->newFileFromRow( $row );
                                $filesObjs[$row->oi_archive_name]->user = $row->oi_user;
                                $filesObjs[$row->oi_archive_name]->user_text = $row->oi_user_text;
                        }
                        // Check through our images
                        foreach( $this->ofiles as $timestamp ) {
                                $archivename = $timestamp.'!'.$this->page->getDBKey();
                                if( !isset($filesObjs[$archivename]) ) {
                                        continue;
                                } else if( !$filesObjs[$archivename]->userCan(File::DELETED_RESTRICTED) ) {
                                        // If a rev is hidden from sysops
                                        if( !$this->wasPosted ) {
                                                return $wgOut->permissionRequired( 'suppressrevision' );
                                        }
                                        $UserAllowed = false;
                                }
                                $revisions++;
                                // Inject history info
                                $wgOut->addHTML( $this->fileLine( $filesObjs[$archivename] ) );
                                $bitfields |= $filesObjs[$archivename]->deleted;
                        }
                // Archived files...
                } else {
                        // Run through and pull all our data in one query
                        foreach( $this->afiles as $id ) {
                                $where[] = intval($id);
                        }
                        $result = $dbr->select( 'filearchive', '*',
                                array(
                                        'fa_name' => $this->page->getDBKey(),
                                        'fa_id'   => $where
                                ),
                                __METHOD__
                        );
                        while( $row = $dbr->fetchObject( $result ) ) {
                                $filesObjs[$row->fa_id] = ArchivedFile::newFromRow( $row );
                        }

                        foreach( $this->afiles as $fileid ) {
                                if( !isset($filesObjs[$fileid]) ) {
                                        continue;
                                } else if( !$filesObjs[$fileid]->userCan(File::DELETED_RESTRICTED) ) {
                                        // If a rev is hidden from sysops
                                        if( !$this->wasPosted ) {
                                                return $wgOut->permissionRequired( 'suppressrevision' );
                                        }
                                        $UserAllowed = false;
                                }
                                $revisions++;
                                // Inject history info
                                $wgOut->addHTML( $this->archivedfileLine( $filesObjs[$fileid] ) );
                                $bitfields |= $filesObjs[$fileid]->deleted;
                        }
                }
                if( !$revisions ) {
                        return $wgOut->showErrorPage( 'revdelete-nooldid-title','revdelete-nooldid-text' );
                }
                
                $wgOut->addHTML( "</ul>" );
                // Explanation text
                $this->addUsageText();
                // Normal sysops can always see what they did, but can't always change it
                if( !$UserAllowed ) return;

                $items = array(
                        Xml::inputLabel( wfMsg( 'revdelete-log' ), 'wpReason', 'wpReason', 60 ),
                        Xml::submitButton( wfMsg( 'revdelete-submit' ) )
                );
                $hidden = array(
                        Xml::hidden( 'wpEditToken', $wgUser->editToken() ),
                        Xml::hidden( 'target', $this->page->getPrefixedText() ),
                        Xml::hidden( 'type', $this->deleteKey )
                );
                if( $this->deleteKey == 'oldimage' ) {
                        $hidden[] = Xml::hidden( 'oldimage', implode(',',$this->oldimgs) );
                } else {
                        $hidden[] = Xml::hidden( 'fileid', implode(',',$this->fileids) );
                }
                $wgOut->addHTML(
                        Xml::openElement( 'form', array( 'method' => 'post',
                                'action' => $this->getTitle()->getLocalUrl( 'action=submit' ), 
                                'id' => 'mw-revdel-form-filerevisions' )
                        ) .
                        Xml::fieldset( wfMsg( 'revdelete-legend' ) )
                );

                $wgOut->addHTML( $this->buildCheckBoxes( $bitfields ) );
                foreach( $items as $item ) {
                        $wgOut->addHTML( "<p>$item</p>" );
                }
                foreach( $hidden as $item ) {
                        $wgOut->addHTML( $item );
                }

                $wgOut->addHTML(
                        Xml::closeElement( 'fieldset' ) .
                        Xml::closeElement( 'form' ) . "\n"
                );
        }

        /**
         * This lets a user set restrictions for log items
         */
        private function showLogItems() {
                global $wgOut, $wgUser, $wgMessageCache, $wgLang;
                $UserAllowed = true;

                $wgOut->addWikiMsg( 'logdelete-selected', $wgLang->formatNum( count($this->events) ) );

                $bitfields = 0;
                $wgOut->addHTML( "<ul>" );

                $where = $logRows = array();
                $dbr = wfGetDB( DB_MASTER );
                // Run through and pull all our data in one query
                $logItems = 0;
                foreach( $this->events as $logid ) {
                        $where[] = intval($logid);
                }
                list($log,$logtype) = explode( '/',$this->page->getDBKey(), 2 );
                $result = $dbr->select( 'logging', '*',
                        array( 'log_type' => $logtype, 'log_id' => $where ),
                        __METHOD__
                );
                while( $row = $dbr->fetchObject( $result ) ) {
                        $logRows[$row->log_id] = $row;
                }
                $wgMessageCache->loadAllMessages();
                foreach( $this->events as $logid ) {
                        // Don't hide from oversight log!!!
                        if( !isset( $logRows[$logid] ) || $logRows[$logid]->log_type=='suppress' ) {
                                continue;
                        } else if( !LogEventsList::userCan( $logRows[$logid],Revision::DELETED_RESTRICTED) ) {
                        // If an event is hidden from sysops
                                if( !$this->wasPosted ) {
                                        return $wgOut->permissionRequired( 'suppressrevision' );
                                }
                                $UserAllowed = false;
                        }
                        $logItems++;
                        $wgOut->addHTML( $this->logLine( $logRows[$logid] ) );
                        $bitfields |= $logRows[$logid]->log_deleted;
                }
                if( !$logItems ) {
                        return $wgOut->showErrorPage( 'revdelete-nologid-title', 'revdelete-nologid-text' );
                }
                
                $wgOut->addHTML( "</ul>" );
                // Explanation text
                $this->addUsageText();
                // Normal sysops can always see what they did, but can't always change it
                if( !$UserAllowed ) return;

                $items = array(
                        Xml::inputLabel( wfMsg( 'revdelete-log' ), 'wpReason', 'wpReason', 60 ),
                        Xml::submitButton( wfMsg( 'revdelete-submit' ) ) );
                $hidden = array(
                        Xml::hidden( 'wpEditToken', $wgUser->editToken() ),
                        Xml::hidden( 'target', $this->page->getPrefixedDBKey() ),
                        Xml::hidden( 'page', $this->contextPage ? $this->contextPage->getPrefixedDBKey() : '' ),
                        Xml::hidden( 'type', $this->deleteKey ),
                        Xml::hidden( 'logid', implode(',',$this->logids) )
                );

                $wgOut->addHTML(
                        Xml::openElement( 'form', array( 'method' => 'post',
                                'action' => $this->getTitle()->getLocalUrl( 'action=submit' ), 'id' => 'mw-revdel-form-logs' ) ) .
                        Xml::fieldset( wfMsg( 'revdelete-legend' ) )
                );
                
                $wgOut->addHTML( $this->buildCheckBoxes( $bitfields ) );
                foreach( $items as $item ) {
                        $wgOut->addHTML( "<p>$item</p>" );
                }
                foreach( $hidden as $item ) {
                        $wgOut->addHTML( $item );
                }

                $wgOut->addHTML(
                        Xml::closeElement( 'fieldset' ) .
                        Xml::closeElement( 'form' ) . "\n"
                );
        }
        
        private function addUsageText() {
                global $wgOut, $wgUser;
                $wgOut->addWikiMsg( 'revdelete-text' );
                if( $wgUser->isAllowed( 'suppressrevision' ) ) {
                        $wgOut->addWikiMsg( 'revdelete-suppress-text' );
                }
        }
        
        /**
        * @param int $bitfields, aggregate bitfield of all the bitfields
        * @returns string HTML
        */
        private function buildCheckBoxes( $bitfields ) {
                $html = '';
                // FIXME: all items checked for just one rev are checked, even if not set for the others
                foreach( $this->checks as $item ) {
                        list( $message, $name, $field ) = $item;
                        $line = Xml::tags( 'div', null, Xml::checkLabel( wfMsg($message), $name, $name,
                                $bitfields & $field ) );
                        if( $field == Revision::DELETED_RESTRICTED ) $line = "<b>$line</b>";
                        $html .= $line;
                }
                return $html;
        }

        /**
         * @param Revision $rev
         * @returns string
         */
        private function historyLine( $rev ) {
                global $wgLang, $wgUser;

                $date = $wgLang->timeanddate( $rev->getTimestamp() );
                $difflink = $del = '';
                // Live revisions
                if( $this->deleteKey == 'oldid' ) {
                        $tokenParams = '&unhide=1&token='.urlencode( $wgUser->editToken( $rev->getId() ) );
                        $revlink = $this->skin->makeLinkObj( $this->page, $date, 'oldid='.$rev->getId() . $tokenParams );
                        $difflink = '(' . $this->skin->makeKnownLinkObj( $this->page, wfMsgHtml('diff'),
                                'diff=' . $rev->getId() . '&oldid=prev' . $tokenParams ) . ')';
                // Archived revisions
                } else {
                        $undelete = SpecialPage::getTitleFor( 'Undelete' );
                        $target = $this->page->getPrefixedText();
                        $revlink = $this->skin->makeLinkObj( $undelete, $date,
                                "target=$target&timestamp=" . $rev->getTimestamp() );
                        $difflink = '(' . $this->skin->makeKnownLinkObj( $undelete, wfMsgHtml('diff'),
                                "target=$target&diff=prev&timestamp=" . $rev->getTimestamp() ) . ')';
                }
                // Check permissions; items may be "suppressed"
                if( $rev->isDeleted(Revision::DELETED_TEXT) ) {
                        $revlink = '<span class="history-deleted">'.$revlink.'</span>';
                        $del = ' <tt>' . wfMsgHtml( 'deletedrev' ) . '</tt>';
                        if( !$rev->userCan(Revision::DELETED_TEXT) ) {
                                $revlink = '<span class="history-deleted">'.$date.'</span>';
                                $difflink = '(' . wfMsgHtml('diff') . ')';
                        }
                }
                $userlink = $this->skin->revUserLink( $rev );
                $comment = $this->skin->revComment( $rev );

                return "<li>$difflink $revlink $userlink $comment{$del}</li>";
        }

        /**
         * @param File $file
         * @returns string
         */
        private function fileLine( $file ) {
                global $wgLang;

                $target = $this->page->getPrefixedText();
                $date = $wgLang->timeanddate( $file->getTimestamp(), true  );

                $del = '';
                # Hidden files...
                if( $file->isDeleted(File::DELETED_FILE) ) {
                        $del = ' <tt>' . wfMsgHtml( 'deletedrev' ) . '</tt>';
                        if( !$file->userCan(File::DELETED_FILE) ) {
                                $pageLink = $date;
                        } else {
                                $pageLink = $this->skin->makeKnownLinkObj( $this->getTitle(), $date,
                                        "target=$target&file=$file->sha1.".$file->getExtension() );
                        }
                        $pageLink = '<span class="history-deleted">' . $pageLink . '</span>';
                # Regular files...
                } else {
                        $url = $file->getUrlRel();
                        $pageLink = "<a href=\"{$url}\">{$date}</a>";
                }

                $data = wfMsg( 'widthheight', $wgLang->formatNum( $file->getWidth() ),
                        $wgLang->formatNum( $file->getHeight() ) ) .
                        ' (' . wfMsgExt( 'nbytes', 'parsemag', $wgLang->formatNum( $file->getSize() ) ) . ')';
                $data = htmlspecialchars( $data );

                return "<li>$pageLink ".$this->fileUserTools( $file )." $data ".
                        $this->fileComment( $file )."$del</li>";
        }

        /**
         * @param ArchivedFile $file
         * @returns string
         */
        private function archivedfileLine( $file ) {
                global $wgLang;

                $target = $this->page->getPrefixedText();
                $date = $wgLang->timeanddate( $file->getTimestamp(), true  );

                $undelete = SpecialPage::getTitleFor( 'Undelete' );
                $pageLink = $this->skin->makeKnownLinkObj( $undelete, $date,
                        "target=$target&file={$file->getKey()}" );

                $del = '';
                if( $file->isDeleted(File::DELETED_FILE) ) {
                        $del = ' <tt>' . wfMsgHtml( 'deletedrev' ) . '</tt>';
                }

                $data = wfMsg( 'widthheight', $wgLang->formatNum( $file->getWidth() ),
                        $wgLang->formatNum( $file->getHeight() ) ) .
                        ' (' . wfMsgExt( 'nbytes', 'parsemag', $wgLang->formatNum( $file->getSize() ) ) . ')';
                $data = htmlspecialchars( $data );

                return "<li>$pageLink ".$this->fileUserTools( $file )." $data ".
                        $this->fileComment( $file )."$del</li>";
        }

        /**
         * @param Array $row row
         * @returns string
         */
        private function logLine( $row ) {
                global $wgLang;

                $date = $wgLang->timeanddate( $row->log_timestamp );
                $paramArray = LogPage::extractParams( $row->log_params );
                $title = Title::makeTitle( $row->log_namespace, $row->log_title );

                $logtitle = SpecialPage::getTitleFor( 'Log' );
                $loglink = $this->skin->makeKnownLinkObj( $logtitle, wfMsgHtml( 'log' ),
                        wfArrayToCGI( array( 'page' => $title->getPrefixedUrl() ) ) );
                // Action text
                if( !LogEventsList::userCan($row,LogPage::DELETED_ACTION) ) {
                        $action = '<span class="history-deleted">' . wfMsgHtml('rev-deleted-event') . '</span>';
                } else {
                        $action = LogPage::actionText( $row->log_type, $row->log_action, $title,
                                $this->skin, $paramArray, true, true );
                        if( $row->log_deleted & LogPage::DELETED_ACTION )
                                $action = '<span class="history-deleted">' . $action . '</span>';
                }
                // User links
                $userLink = $this->skin->userLink( $row->log_user, User::WhoIs($row->log_user) );
                if( LogEventsList::isDeleted($row,LogPage::DELETED_USER) ) {
                        $userLink = '<span class="history-deleted">' . $userLink . '</span>';
                }
                // Comment
                $comment = $wgLang->getDirMark() . $this->skin->commentBlock( $row->log_comment );
                if( LogEventsList::isDeleted($row,LogPage::DELETED_COMMENT) ) {
                        $comment = '<span class="history-deleted">' . $comment . '</span>';
                }
                return "<li>($loglink) $date $userLink $action $comment</li>";
        }

        /**
         * Generate a user tool link cluster if the current user is allowed to view it
         * @param ArchivedFile $file
         * @return string HTML
         */
        private function fileUserTools( $file ) {
                if( $file->userCan( Revision::DELETED_USER ) ) {
                        $link = $this->skin->userLink( $file->user, $file->user_text ) .
                                $this->skin->userToolLinks( $file->user, $file->user_text );
                } else {
                        $link = wfMsgHtml( 'rev-deleted-user' );
                }
                if( $file->isDeleted( Revision::DELETED_USER ) ) {
                        return '<span class="history-deleted">' . $link . '</span>';
                }
                return $link;
        }

        /**
         * Wrap and format the given file's comment block, if the current
         * user is allowed to view it.
         *
         * @param ArchivedFile $file
         * @return string HTML
         */
        private function fileComment( $file ) {
                if( $file->userCan( File::DELETED_COMMENT ) ) {
                        $block = $this->skin->commentBlock( $file->description );
                } else {
                        $block = ' ' . wfMsgHtml( 'rev-deleted-comment' );
                }
                if( $file->isDeleted( File::DELETED_COMMENT ) ) {
                        return "<span class=\"history-deleted\">$block</span>";
                }
                return $block;
        }

        /**
         * @param WebRequest $request
         */
        private function submit( $request ) {
                global $wgUser, $wgOut;
                # Check edit token on submission
                if( $this->wasPosted && !$wgUser->matchEditToken( $request->getVal('wpEditToken') ) ) {
                        $wgOut->addWikiMsg( 'sessionfailure' );
                        return false;
                }
                $bitfield = $this->extractBitfield( $request );
                $comment = $request->getText( 'wpReason' );
                # Can the user set this field?
                if( $bitfield & Revision::DELETED_RESTRICTED && !$wgUser->isAllowed('suppressrevision') ) {
                        $wgOut->permissionRequired( 'suppressrevision' );
                        return false;
                }
                # If the save went through, go to success message...
                if( $this->save( $bitfield, $comment, $this->page ) ) {
                        $this->success();
                        return true;
                # ...otherwise, bounce back to form...
                } else {
                        $this->failure();
                }
                return false;
        }

        private function success() {
                global $wgOut;
                $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
                $wrap = '<span class="success">$1</span>';
                if( $this->deleteKey == 'logid' ) {
                        $wgOut->wrapWikiMsg( $wrap, 'logdelete-success' );
                        $this->showLogItems();
                } else if( $this->deleteKey == 'oldid' || $this->deleteKey == 'artimestamp' ) {
                        $wgOut->wrapWikiMsg( $wrap, 'revdelete-success' );
                        $this->showRevs();
                } else if( $this->deleteKey == 'fileid' ) {
                        $wgOut->wrapWikiMsg( $wrap, 'revdelete-success' );
                        $this->showImages();
                } else if( $this->deleteKey == 'oldimage' ) {
                        $wgOut->wrapWikiMsg( $wrap, 'revdelete-success' );
                        $this->showImages();
                }
        }
        
        private function failure() {
                global $wgOut;
                $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
                $wrap = '<span class="error">$1</span>';
                if( $this->deleteKey == 'logid' ) {
                        $this->showLogItems();
                } else if( $this->deleteKey == 'oldid' || $this->deleteKey == 'artimestamp' ) {
                        $wgOut->wrapWikiMsg( $wrap, 'revdelete-failure' );
                        $this->showRevs();
                } else if( $this->deleteKey == 'fileid' ) {
                        $wgOut->wrapWikiMsg( $wrap, 'revdelete-failure' );
                        $this->showImages();
                } else if( $this->deleteKey == 'oldimage' ) {
                        $wgOut->wrapWikiMsg( $wrap, 'revdelete-failure' );
                        $this->showImages();
                }
        }

        /**
         * Put together a rev_deleted bitfield from the submitted checkboxes
         * @param WebRequest $request
         * @return int
         */
        private function extractBitfield( $request ) {
                $bitfield = 0;
                foreach( $this->checks as $item ) {
                        list( /* message */ , $name, $field ) = $item;
                        if( $request->getCheck( $name ) ) {
                                $bitfield |= $field;
                        }
                }
                return $bitfield;
        }

        private function save( $bitfield, $reason, $title ) {
                $dbw = wfGetDB( DB_MASTER );
                // Don't allow simply locking the interface for no reason
                if( $bitfield == Revision::DELETED_RESTRICTED ) {
                        $bitfield = 0;
                }
                $deleter = new RevisionDeleter( $dbw );
                // By this point, only one of the below should be set
                if( isset($this->revisions) ) {
                        return $deleter->setRevVisibility( $title, $this->revisions, $bitfield, $reason );
                } else if( isset($this->archrevs) ) {
                        return $deleter->setArchiveVisibility( $title, $this->archrevs, $bitfield, $reason );
                } else if( isset($this->ofiles) ) {
                        return $deleter->setOldImgVisibility( $title, $this->ofiles, $bitfield, $reason );
                } else if( isset($this->afiles) ) {
                        return $deleter->setArchFileVisibility( $title, $this->afiles, $bitfield, $reason );
                } else if( isset($this->events) ) {
                        return $deleter->setEventVisibility( $title, $this->events, $bitfield, $reason );
                }
                return false;
        }
}

/**
 * Implements the actions for Revision Deletion.
 * @ingroup SpecialPage
 */
class RevisionDeleter {
        function __construct( $db ) {
                $this->dbw = $db;
        }

        /**
         * @param $title, the page these events apply to
         * @param array $items list of revision ID numbers
         * @param int $bitfield new rev_deleted value
         * @param string $comment Comment for log records
         */
        function setRevVisibility( $title, $items, $bitfield, $comment ) {
                global $wgOut;

                $userAllowedAll = $success = true;
                $revIDs = array();
                $revCount = 0;
                // Run through and pull all our data in one query
                foreach( $items as $revid ) {
                        $where[] = intval($revid);
                }
                $result = $this->dbw->select( array('revision','page'), '*',
                        array( 'rev_page' => $title->getArticleID(),
                                'rev_id' => $where, 'rev_page = page_id' ),
                        __METHOD__
                );
                while( $row = $this->dbw->fetchObject( $result ) ) {
                        $revObjs[$row->rev_id] = new Revision( $row );
                }
                // To work!
                foreach( $items as $revid ) {
                        if( !isset($revObjs[$revid]) ) {
                                $success = false;
                                continue; // Must exist
                        } else if( $revObjs[$revid]->isCurrent() && ($bitfield & Revision::DELETED_TEXT) ) {
                                $success = false;
                                continue; // Cannot hide current version text
                        } else if( !$revObjs[$revid]->userCan(Revision::DELETED_RESTRICTED) ) {
                        $userAllowedAll = false;
                                continue;
                        }
                        // For logging, maintain a count of revisions
                        if( $revObjs[$revid]->mDeleted != $bitfield ) {
                                $revIDs[] = $revid;
                                $this->updateRevision( $revObjs[$revid], $bitfield );
                                $this->updateRecentChangesEdits( $revObjs[$revid], $bitfield, false );
                                $revCount++;
                        }
                }
                // Clear caches...
                // Don't log or touch if nothing changed
                if( $revCount > 0 ) {
                        $this->updateLog( $title, $revCount, $bitfield, $revObjs[$revid]->mDeleted,
                                $comment, $title, 'oldid', $revIDs );
                        $this->updatePage( $title );
                }
                // Where all revs allowed to be set?
                if( !$userAllowedAll ) {
                        //FIXME: still might be confusing???
                        $wgOut->permissionRequired( 'suppressrevision' );
                        return false;
                }

                return $success;
        }

         /**
         * @param $title, the page these events apply to
         * @param array $items list of revision ID numbers
         * @param int $bitfield new rev_deleted value
         * @param string $comment Comment for log records
         */
        function setArchiveVisibility( $title, $items, $bitfield, $comment ) {
                global $wgOut;

                $userAllowedAll = $success = true;
                $count = 0;
                $Id_set = array();
                // Run through and pull all our data in one query
                foreach( $items as $timestamp ) {
                        $where[] = $this->dbw->timestamp( $timestamp );
                }
                $result = $this->dbw->select( 'archive', '*',
                        array(
                                'ar_namespace' => $title->getNamespace(),
                                'ar_title' => $title->getDBKey(),
                                'ar_timestamp' => $where
                        ), __METHOD__
                );
                while( $row = $this->dbw->fetchObject( $result ) ) {
                        $timestamp = wfTimestamp( TS_MW, $row->ar_timestamp );
                        $revObjs[$timestamp] = new Revision( array(
                                'page'       => $title->getArticleId(),
                                'id'         => $row->ar_rev_id,
                                'text'       => $row->ar_text_id,
                                'comment'    => $row->ar_comment,
                                'user'       => $row->ar_user,
                                'user_text'  => $row->ar_user_text,
                                'timestamp'  => $timestamp,
                                'minor_edit' => $row->ar_minor_edit,
                                'text_id'    => $row->ar_text_id,
                                'deleted'    => $row->ar_deleted,
                                'len'        => $row->ar_len) );
                }
                // To work!
                foreach( $items as $timestamp ) {
                        // This will only select the first revision with this timestamp.
                        // Since they are all selected/deleted at once, we can just check the
                        // permissions of one. UPDATE is done via timestamp, so all revs are set.
                        if( !is_object($revObjs[$timestamp]) ) {
                                $success = false;
                                continue; // Must exist
                        } else if( !$revObjs[$timestamp]->userCan(Revision::DELETED_RESTRICTED) ) {
                        $userAllowedAll=false;
                                continue;
                        }
                        // Which revisions did we change anything about?
                        if( $revObjs[$timestamp]->mDeleted != $bitfield ) {
                                $Id_set[] = $timestamp;
                                $this->updateArchive( $revObjs[$timestamp], $title, $bitfield );
                            $count++;
                        }
                }
                // For logging, maintain a count of revisions
                if( $count > 0 ) {
                        $this->updateLog( $title, $count, $bitfield, $revObjs[$timestamp]->mDeleted,
                                $comment, $title, 'artimestamp', $Id_set );
                }
                // Where all revs allowed to be set?
                if( !$userAllowedAll ) {
                        $wgOut->permissionRequired( 'suppressrevision' );
                        return false;
                }

                return $success;
        }

         /**
         * @param $title, the page these events apply to
         * @param array $items list of revision ID numbers
         * @param int $bitfield new rev_deleted value
         * @param string $comment Comment for log records
         */
        function setOldImgVisibility( $title, $items, $bitfield, $comment ) {
                global $wgOut;

                $userAllowedAll = $success = true;
                $count = 0;
                $set = array();
                // Run through and pull all our data in one query
                foreach( $items as $timestamp ) {
                        $where[] = $timestamp.'!'.$title->getDBKey();
                }
                $result = $this->dbw->select( 'oldimage', '*',
                        array( 'oi_name' => $title->getDBKey(), 'oi_archive_name' => $where ),
                        __METHOD__
                );
                while( $row = $this->dbw->fetchObject( $result ) ) {
                        $filesObjs[$row->oi_archive_name] = RepoGroup::singleton()->getLocalRepo()->newFileFromRow( $row );
                        $filesObjs[$row->oi_archive_name]->user = $row->oi_user;
                        $filesObjs[$row->oi_archive_name]->user_text = $row->oi_user_text;
                }
                // To work!
                foreach( $items as $timestamp ) {
                        $archivename = $timestamp.'!'.$title->getDBKey();
                        if( !isset($filesObjs[$archivename]) ) {
                                $success = false;
                                continue; // Must exist
                        } else if( !$filesObjs[$archivename]->userCan(File::DELETED_RESTRICTED) ) {
                        $userAllowedAll=false;
                                continue;
                        }

                        $transaction = true;
                        // Which revisions did we change anything about?
                        if( $filesObjs[$archivename]->deleted != $bitfield ) {
                                $count++;

                                $this->dbw->begin();
                                $this->updateOldFiles( $filesObjs[$archivename], $bitfield );
                                // If this image is currently hidden...
                                if( $filesObjs[$archivename]->deleted & File::DELETED_FILE ) {
                                        if( $bitfield & File::DELETED_FILE ) {
                                                # Leave it alone if we are not changing this...
                                                $set[]=$timestamp;
                                                $transaction = true;
                                        } else {
                                                # We are moving this out
                                                $transaction = $this->makeOldImagePublic( $filesObjs[$archivename] );
                                                $set[]=$transaction;
                                        }
                                // Is it just now becoming hidden?
                                } else if( $bitfield & File::DELETED_FILE ) {
                                        $transaction = $this->makeOldImagePrivate( $filesObjs[$archivename] );
                                        $set[]=$transaction;
                                } else {
                                        $set[]=$timestamp;
                                }
                                // If our file operations fail, then revert back the db
                                if( $transaction==false ) {
                                        $this->dbw->rollback();
                                        return false;
                                }
                                $this->dbw->commit();
                        }
                }

                // Log if something was changed
                if( $count > 0 ) {
                        $this->updateLog( $title, $count, $bitfield, $filesObjs[$archivename]->deleted,
                                $comment, $title, 'oldimage', $set );
                        # Purge page/history
                        $file = wfLocalFile( $title );
                        $file->purgeCache();
                        $file->purgeHistory();
                        # Invalidate cache for all pages using this file
                        $update = new HTMLCacheUpdate( $title, 'imagelinks' );
                        $update->doUpdate();
                }
                // Where all revs allowed to be set?
                if( !$userAllowedAll ) {
                        $wgOut->permissionRequired( 'suppressrevision' );
                        return false;
                }

                return $success;
        }

         /**
         * @param $title, the page these events apply to
         * @param array $items list of revision ID numbers
         * @param int $bitfield new rev_deleted value
         * @param string $comment Comment for log records
         */
        function setArchFileVisibility( $title, $items, $bitfield, $comment ) {
                global $wgOut;

                $userAllowedAll = $success = true;
                $count = 0;
                $Id_set = array();

                // Run through and pull all our data in one query
                foreach( $items as $id ) {
                        $where[] = intval($id);
                }
                $result = $this->dbw->select( 'filearchive', '*',
                        array( 'fa_name' => $title->getDBKey(),
                                'fa_id' => $where ),
                        __METHOD__ );
                while( $row = $this->dbw->fetchObject( $result ) ) {
                        $filesObjs[$row->fa_id] = ArchivedFile::newFromRow( $row );
                }
                // To work!
                foreach( $items as $fileid ) {
                        if( !isset($filesObjs[$fileid]) ) {
                                $success = false;
                                continue; // Must exist
                        } else if( !$filesObjs[$fileid]->userCan(File::DELETED_RESTRICTED) ) {
                        $userAllowedAll=false;
                                continue;
                        }
                        // Which revisions did we change anything about?
                        if( $filesObjs[$fileid]->deleted != $bitfield ) {
                           $Id_set[]=$fileid;
                           $count++;

                           $this->updateArchFiles( $filesObjs[$fileid], $bitfield );
                        }
                }
                // Log if something was changed
                if( $count > 0 ) {
                        $this->updateLog( $title, $count, $bitfield, $comment,
                                $filesObjs[$fileid]->deleted, $title, 'fileid', $Id_set );
                }
                // Where all revs allowed to be set?
                if( !$userAllowedAll ) {
                        $wgOut->permissionRequired( 'suppressrevision' );
                        return false;
                }

                return $success;
        }

        /**
         * @param $title, the log page these events apply to
         * @param array $items list of log ID numbers
         * @param int $bitfield new log_deleted value
         * @param string $comment Comment for log records
         */
        function setEventVisibility( $title, $items, $bitfield, $comment ) {
                global $wgOut;

                $userAllowedAll = $success = true;
                $count = 0;
                $log_Ids = array();

                // Run through and pull all our data in one query
                foreach( $items as $logid ) {
                        $where[] = intval($logid);
                }
                list($log,$logtype) = explode( '/',$title->getDBKey(), 2 );
                $result = $this->dbw->select( 'logging', '*',
                        array( 'log_type' => $logtype, 'log_id' => $where ),
                        __METHOD__
                );
                while( $row = $this->dbw->fetchObject( $result ) ) {
                        $logRows[$row->log_id] = $row;
                }
                // To work!
                foreach( $items as $logid ) {
                        if( !isset($logRows[$logid]) ) {
                                $success = false;
                                continue; // Must exist
                        } else if( !LogEventsList::userCan($logRows[$logid], LogPage::DELETED_RESTRICTED)
                                || $logRows[$logid]->log_type == 'suppress' )
                        {
                        $userAllowedAll=false; // Don't hide from oversight log!!!
                        continue;
                        }
                        // Which logs did we change anything about?
                        if( $logRows[$logid]->log_deleted != $bitfield ) {
                                $log_Ids[] = $logid;
                                $this->updateLogs( $logRows[$logid], $bitfield );
                                $this->updateRecentChangesLog( $logRows[$logid], $bitfield );
                                $count++;
                        }
                }
                // Don't log or touch if nothing changed
                if( $count > 0 ) {
                        $this->updateLog( $title, $count, $bitfield, $logRows[$logid]->log_deleted,
                                $comment, $title, 'logid', $log_Ids );
                }
                // Were all revs allowed to be set?
                if( !$userAllowedAll ) {
                        $wgOut->permissionRequired( 'suppressrevision' );
                        return false;
                }

                return $success;
        }

        /**
         * Moves an image to a safe private location
         * Caller is responsible for clearing caches
         * @param File $oimage
         * @returns mixed, timestamp string on success, false on failure
         */
        function makeOldImagePrivate( $oimage ) {
                $transaction = new FSTransaction();
                if( !FileStore::lock() ) {
                        wfDebug( __METHOD__.": failed to acquire file store lock, aborting\n" );
                        return false;
                }
                $oldpath = $oimage->getArchivePath() . DIRECTORY_SEPARATOR . $oimage->archive_name;
                // Dupe the file into the file store
                if( file_exists( $oldpath ) ) {
                        // Is our directory configured?
                        if( $store = FileStore::get( 'deleted' ) ) {
                                if( !$oimage->sha1 ) {
                                        $oimage->upgradeRow(); // sha1 may be missing
                                }
                                $key = $oimage->sha1 . '.' . $oimage->getExtension();
                                $transaction->add( $store->insert( $key, $oldpath, FileStore::DELETE_ORIGINAL ) );
                        } else {
                                $group = null;
                                $key = null;
                                $transaction = false; // Return an error and do nothing
                        }
                } else {
                        wfDebug( __METHOD__." deleting already-missing '$oldpath'; moving on to database\n" );
                        $group = null;
                        $key = '';
                        $transaction = new FSTransaction(); // empty
                }

                if( $transaction === false ) {
                        // Fail to restore?
                        wfDebug( __METHOD__.": import to file store failed, aborting\n" );
                        throw new MWException( "Could not archive and delete file $oldpath" );
                        return false;
                }

                wfDebug( __METHOD__.": set db items, applying file transactions\n" );
                $transaction->commit();
                FileStore::unlock();

                $m = explode('!',$oimage->archive_name,2);
                $timestamp = $m[0];

                return $timestamp;
        }

        /**
         * Moves an image from a safe private location
         * Caller is responsible for clearing caches
         * @param File $oimage
         * @returns mixed, string timestamp on success, false on failure
         */
        function makeOldImagePublic( $oimage ) {
                $transaction = new FSTransaction();
                if( !FileStore::lock() ) {
                        wfDebug( __METHOD__." could not acquire filestore lock\n" );
                        return false;
                }

                $store = FileStore::get( 'deleted' );
                if( !$store ) {
                        wfDebug( __METHOD__.": skipping row with no file.\n" );
                        return false;
                }

                $key = $oimage->sha1.'.'.$oimage->getExtension();
                $destDir = $oimage->getArchivePath();
                if( !is_dir( $destDir ) ) {
                        wfMkdirParents( $destDir );
                }
                $destPath = $destDir . DIRECTORY_SEPARATOR . $oimage->archive_name;
                // Check if any other stored revisions use this file;
                // if so, we shouldn't remove the file from the hidden
                // archives so they will still work. Check hidden files first.
                $useCount = $this->dbw->selectField( 'oldimage', '1',
                        array( 'oi_sha1' => $oimage->sha1,
                                'oi_deleted & '.File::DELETED_FILE => File::DELETED_FILE ),
                        __METHOD__, array( 'FOR UPDATE' ) );
                // Check the rest of the deleted archives too.
                // (these are the ones that don't show in the image history)
                if( !$useCount ) {
                        $useCount = $this->dbw->selectField( 'filearchive', '1',
                                array( 'fa_storage_group' => 'deleted', 'fa_storage_key' => $key ),
                                __METHOD__, array( 'FOR UPDATE' ) );
                }

                if( $useCount == 0 ) {
                        wfDebug( __METHOD__.": nothing else using {$oimage->sha1}, will deleting after\n" );
                        $flags = FileStore::DELETE_ORIGINAL;
                } else {
                        $flags = 0;
                }
                $transaction->add( $store->export( $key, $destPath, $flags ) );

                wfDebug( __METHOD__.": set db items, applying file transactions\n" );
                $transaction->commit();
                FileStore::unlock();

                $m = explode('!',$oimage->archive_name,2);
                $timestamp = $m[0];

                return $timestamp;
        }

        /**
         * Update the revision's rev_deleted field
         * @param Revision $rev
         * @param int $bitfield new rev_deleted bitfield value
         */
        function updateRevision( $rev, $bitfield ) {
                $this->dbw->update( 'revision',
                        array( 'rev_deleted' => $bitfield ),
                        array( 'rev_id' => $rev->getId(), 'rev_page' => $rev->getPage() ),
                        __METHOD__
                );
        }

        /**
         * Update the revision's rev_deleted field
         * @param Revision $rev
         * @param Title $title
         * @param int $bitfield new rev_deleted bitfield value
         */
        function updateArchive( $rev, $title, $bitfield ) {
                $this->dbw->update( 'archive',
                        array( 'ar_deleted' => $bitfield ),
                        array( 'ar_namespace' => $title->getNamespace(),
                                'ar_title'     => $title->getDBKey(),
                                // use timestamp for index
                                'ar_timestamp' => $this->dbw->timestamp( $rev->getTimestamp() ),
                                'ar_rev_id'    => $rev->getId()
                        ),
                        __METHOD__ );
        }

        /**
         * Update the images's oi_deleted field
         * @param File $file
         * @param int $bitfield new rev_deleted bitfield value
         */
        function updateOldFiles( $file, $bitfield ) {
                $this->dbw->update( 'oldimage',
                        array( 'oi_deleted' => $bitfield ),
                        array( 'oi_name' => $file->getName(),
                                'oi_timestamp' => $this->dbw->timestamp( $file->getTimestamp() ) ),
                        __METHOD__
                );
        }

        /**
         * Update the images's fa_deleted field
         * @param ArchivedFile $file
         * @param int $bitfield new rev_deleted bitfield value
         */
        function updateArchFiles( $file, $bitfield ) {
                $this->dbw->update( 'filearchive',
                        array( 'fa_deleted' => $bitfield ),
                        array( 'fa_id' => $file->getId() ),
                        __METHOD__
                );
        }

        /**
         * Update the logging log_deleted field
         * @param Row $row
         * @param int $bitfield new rev_deleted bitfield value
         */
        function updateLogs( $row, $bitfield ) {
                $this->dbw->update( 'logging',
                        array( 'log_deleted' => $bitfield ),
                        array( 'log_id' => $row->log_id ),
                        __METHOD__
                );
        }

        /**
         * Update the revision's recentchanges record if fields have been hidden
         * @param Revision $rev
         * @param int $bitfield new rev_deleted bitfield value
         */
        function updateRecentChangesEdits( $rev, $bitfield ) {
                $this->dbw->update( 'recentchanges',
                        array( 'rc_deleted' => $bitfield,
                                   'rc_patrolled' => 1 ),
                        array( 'rc_this_oldid' => $rev->getId(),
                                'rc_timestamp' => $this->dbw->timestamp( $rev->getTimestamp() ) ),
                        __METHOD__
                );
        }

        /**
         * Update the revision's recentchanges record if fields have been hidden
         * @param Row $row
         * @param int $bitfield new rev_deleted bitfield value
         */
        function updateRecentChangesLog( $row, $bitfield ) {
                $this->dbw->update( 'recentchanges',
                        array( 'rc_deleted' => $bitfield,
                                   'rc_patrolled' => 1 ),
                        array( 'rc_logid' => $row->log_id,
                                'rc_timestamp' => $row->log_timestamp ),
                        __METHOD__
                );
        }

        /**
         * Touch the page's cache invalidation timestamp; this forces cached
         * history views to refresh, so any newly hidden or shown fields will
         * update properly.
         * @param Title $title
         */
        function updatePage( $title ) {
                $title->invalidateCache();
                $title->purgeSquid();
                $title->touchLinks();
                // Extensions that require referencing previous revisions may need this
                wfRunHooks( 'ArticleRevisionVisiblitySet', array( &$title ) );
        }

        /**
         * Checks for a change in the bitfield for a certain option and updates the
         * provided array accordingly.
         *
         * @param String $desc Description to add to the array if the option was
         * enabled / disabled.
         * @param int $field The bitmask describing the single option.
         * @param int $diff The xor of the old and new bitfields.
         * @param array $arr The array to update.
         */
        protected static function checkItem( $desc, $field, $diff, $new, &$arr ) {
                if( $diff & $field ) {
                        $arr[ ( $new & $field ) ? 0 : 1 ][] = $desc;
                }
        }

        /**
         * Gets an array describing the changes made to the visibilit of the revision.
         * If the resulting array is $arr, then $arr[0] will contain an array of strings
         * describing the items that were hidden, $arr[2] will contain an array of strings
         * describing the items that were unhidden, and $arr[3] will contain an array with
         * a single string, which can be one of "applied restrictions to sysops",
         * "removed restrictions from sysops", or null.
         *
         * @param int $n The new bitfield.
         * @param int $o The old bitfield.
         * @return An array as described above.
         */
        protected static function getChanges( $n, $o ) {
                $diff = $n ^ $o;
                $ret = array( 0 => array(), 1 => array(), 2 => array() );
                // Build bitfield changes in language
                self::checkItem( wfMsgForContent( 'revdelete-content' ),
                        Revision::DELETED_TEXT, $diff, $n, $ret );
                self::checkItem( wfMsgForContent( 'revdelete-summary' ),
                        Revision::DELETED_COMMENT, $diff, $n, $ret );
                self::checkItem( wfMsgForContent( 'revdelete-uname' ),
                        Revision::DELETED_USER, $diff, $n, $ret );
                // Restriction application to sysops
                if( $diff & Revision::DELETED_RESTRICTED ) {
                        if( $n & Revision::DELETED_RESTRICTED )
                                $ret[2][] = wfMsgForContent( 'revdelete-restricted' );
                        else
                                $ret[2][] = wfMsgForContent( 'revdelete-unrestricted' );
                }
                return $ret;
        }

        /**
         * Gets a log message to describe the given revision visibility change. This
         * message will be of the form "[hid {content, edit summary, username}];
         * [unhid {...}][applied restrictions to sysops] for $count revisions: $comment".
         *
         * @param int $count The number of effected revisions.
         * @param int $nbitfield The new bitfield for the revision.
         * @param int $obitfield The old bitfield for the revision.
         * @param bool $isForLog
         */
        public static function getLogMessage( $count, $nbitfield, $obitfield, $isForLog = false ) {
                global $wgLang;
                $s = '';
                $changes = self::getChanges( $nbitfield, $obitfield );
                if( count( $changes[0] ) ) {
                        $s .= wfMsgForContent ( 'revdelete-hid', implode ( ', ', $changes[0] ) );
                }
                if( count( $changes[1] ) ) {
                        if ($s) $s .= '; ';
                        $s .= wfMsgForContent ( 'revdelete-unhid', implode ( ', ', $changes[1] ) );
                }
                if( count( $changes[2] ) ) {
                        $s .= $s ? ' (' . $changes[2][0] . ')' : $changes[2][0];
                }
                $msg = $isForLog ? 'logdelete-log-message' : 'revdelete-log-message';
                return wfMsgExt( $msg, array( 'parsemag', 'content' ), $s, $wgLang->formatNum($count) );

        }

        /**
         * Record a log entry on the action
         * @param Title $title, page where item was removed from
         * @param int $count the number of revisions altered for this page
         * @param int $nbitfield the new _deleted value
         * @param int $obitfield the old _deleted value
         * @param string $comment
         * @param Title $target, the relevant page
         * @param string $param, URL param
         * @param Array $items
         */
        function updateLog( $title, $count, $nbitfield, $obitfield, $comment, $target,
                $param, $items = array() )
        {
                // Put things hidden from sysops in the oversight log
                $logtype = ( ($nbitfield | $obitfield) & Revision::DELETED_RESTRICTED ) ?
                        'suppress' : 'delete';
                $log = new LogPage( $logtype );
                $itemCSV = implode(',',$items);

                if( $param == 'logid' ) {
                        $params = array( $itemCSV, "ofield={$obitfield}", "nfield={$nbitfield}" );
                        $log->addEntry( 'event', $title, $comment, $params );
                } else {
                        // Add params for effected page and ids
                        $params = array( $param, $itemCSV, "ofield={$obitfield}", "nfield={$nbitfield}" );
                        $log->addEntry( 'revision', $title, $comment, $params );
                }
        }
}