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diff --git a/www/wiki/includes/user/LocalIdLookup.php b/www/wiki/includes/user/LocalIdLookup.php
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+++ b/www/wiki/includes/user/LocalIdLookup.php
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+<?php
+/**
+ * A central user id lookup service implementation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * A CentralIdLookup provider that just uses local IDs. Useful if the wiki
+ * isn't part of a cluster or you're using shared user tables.
+ *
+ * @note Shared user table support expects that all wikis involved have
+ *  $wgSharedDB and $wgSharedTables set, and that all wikis involved in the
+ *  sharing are listed in $wgLocalDatabases, and that no wikis not involved in
+ *  the sharing are listed in $wgLocalDatabases.
+ * @since 1.27
+ */
+class LocalIdLookup extends CentralIdLookup {
+
+	public function isAttached( User $user, $wikiId = null ) {
+		global $wgSharedDB, $wgSharedTables, $wgLocalDatabases;
+
+		// If the user has no ID, it can't be attached
+		if ( !$user->getId() ) {
+			return false;
+		}
+
+		// Easy case, we're checking locally
+		if ( $wikiId === null || $wikiId === wfWikiID() ) {
+			return true;
+		}
+
+		// Assume that shared user tables are set up as described above, if
+		// they're being used at all.
+		return $wgSharedDB !== null &&
+			in_array( 'user', $wgSharedTables, true ) &&
+			in_array( $wikiId, $wgLocalDatabases, true );
+	}
+
+	public function lookupCentralIds(
+		array $idToName, $audience = self::AUDIENCE_PUBLIC, $flags = self::READ_NORMAL
+	) {
+		if ( !$idToName ) {
+			return [];
+		}
+
+		$audience = $this->checkAudience( $audience );
+		list( $index, $options ) = DBAccessObjectUtils::getDBOptions( $flags );
+		$db = wfGetDB( $index );
+
+		$tables = [ 'user' ];
+		$fields = [ 'user_id', 'user_name' ];
+		$where = [
+			'user_id' => array_map( 'intval', array_keys( $idToName ) ),
+		];
+		$join = [];
+		if ( $audience && !$audience->isAllowed( 'hideuser' ) ) {
+			$tables[] = 'ipblocks';
+			$join['ipblocks'] = [ 'LEFT JOIN', 'ipb_user=user_id' ];
+			$fields[] = 'ipb_deleted';
+		}
+
+		$res = $db->select( $tables, $fields, $where, __METHOD__, $options, $join );
+		foreach ( $res as $row ) {
+			$idToName[$row->user_id] = empty( $row->ipb_deleted ) ? $row->user_name : '';
+		}
+
+		return $idToName;
+	}
+
+	public function lookupUserNames(
+		array $nameToId, $audience = self::AUDIENCE_PUBLIC, $flags = self::READ_NORMAL
+	) {
+		if ( !$nameToId ) {
+			return [];
+		}
+
+		$audience = $this->checkAudience( $audience );
+		list( $index, $options ) = DBAccessObjectUtils::getDBOptions( $flags );
+		$db = wfGetDB( $index );
+
+		$tables = [ 'user' ];
+		$fields = [ 'user_id', 'user_name' ];
+		$where = [
+			'user_name' => array_map( 'strval', array_keys( $nameToId ) ),
+		];
+		$join = [];
+		if ( $audience && !$audience->isAllowed( 'hideuser' ) ) {
+			$tables[] = 'ipblocks';
+			$join['ipblocks'] = [ 'LEFT JOIN', 'ipb_user=user_id' ];
+			$where[] = 'ipb_deleted = 0 OR ipb_deleted IS NULL';
+		}
+
+		$res = $db->select( $tables, $fields, $where, __METHOD__, $options, $join );
+		foreach ( $res as $row ) {
+			$nameToId[$row->user_name] = (int)$row->user_id;
+		}
+
+		return $nameToId;
+	}
+}