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diff --git a/www/wiki/includes/WikiMap.php b/www/wiki/includes/WikiMap.php
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+<?php
+/**
+ * Tools for dealing with other locally-hosted wikis.
+ *
+ * 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
+ */
+
+use MediaWiki\MediaWikiServices;
+use Wikimedia\Rdbms\DatabaseDomain;
+
+/**
+ * Helper tools for dealing with other locally-hosted wikis.
+ */
+class WikiMap {
+
+	/**
+	 * Get a WikiReference object for $wikiID
+	 *
+	 * @param string $wikiID Wiki'd id (generally database name)
+	 * @return WikiReference|null WikiReference object or null if the wiki was not found
+	 */
+	public static function getWiki( $wikiID ) {
+		$wikiReference = self::getWikiReferenceFromWgConf( $wikiID );
+		if ( $wikiReference ) {
+			return $wikiReference;
+		}
+
+		// Try sites, if $wgConf failed
+		return self::getWikiWikiReferenceFromSites( $wikiID );
+	}
+
+	/**
+	 * @param string $wikiID
+	 * @return WikiReference|null WikiReference object or null if the wiki was not found
+	 */
+	private static function getWikiReferenceFromWgConf( $wikiID ) {
+		global $wgConf;
+
+		$wgConf->loadFullData();
+
+		list( $major, $minor ) = $wgConf->siteFromDB( $wikiID );
+		if ( $major === null ) {
+			return null;
+		}
+		$server = $wgConf->get( 'wgServer', $wikiID, $major,
+			[ 'lang' => $minor, 'site' => $major ] );
+
+		$canonicalServer = $wgConf->get( 'wgCanonicalServer', $wikiID, $major,
+			[ 'lang' => $minor, 'site' => $major ] );
+		if ( $canonicalServer === false || $canonicalServer === null ) {
+			$canonicalServer = $server;
+		}
+
+		$path = $wgConf->get( 'wgArticlePath', $wikiID, $major,
+			[ 'lang' => $minor, 'site' => $major ] );
+
+		// If we don't have a canonical server or a path containing $1, the
+		// WikiReference isn't going to function properly. Just return null in
+		// that case.
+		if ( !is_string( $canonicalServer ) || !is_string( $path ) || strpos( $path, '$1' ) === false ) {
+			return null;
+		}
+
+		return new WikiReference( $canonicalServer, $path, $server );
+	}
+
+	/**
+	 * @param string $wikiID
+	 * @return WikiReference|null WikiReference object or null if the wiki was not found
+	 */
+	private static function getWikiWikiReferenceFromSites( $wikiID ) {
+		$siteLookup = MediaWikiServices::getInstance()->getSiteLookup();
+		$site = $siteLookup->getSite( $wikiID );
+
+		if ( !$site instanceof MediaWikiSite ) {
+			// Abort if not a MediaWikiSite, as this is about Wikis
+			return null;
+		}
+
+		$urlParts = wfParseUrl( $site->getPageUrl() );
+		if ( $urlParts === false || !isset( $urlParts['path'] ) || !isset( $urlParts['host'] ) ) {
+			// We can't create a meaningful WikiReference without URLs
+			return null;
+		}
+
+		// XXX: Check whether path contains a $1?
+		$path = $urlParts['path'];
+		if ( isset( $urlParts['query'] ) ) {
+			$path .= '?' . $urlParts['query'];
+		}
+
+		$canonicalServer = isset( $urlParts['scheme'] ) ? $urlParts['scheme'] : 'http';
+		$canonicalServer .= '://' . $urlParts['host'];
+
+		return new WikiReference( $canonicalServer, $path );
+	}
+
+	/**
+	 * Convenience to get the wiki's display name
+	 *
+	 * @todo We can give more info than just the wiki id!
+	 * @param string $wikiID Wiki'd id (generally database name)
+	 * @return string|int Wiki's name or $wiki_id if the wiki was not found
+	 */
+	public static function getWikiName( $wikiID ) {
+		$wiki = self::getWiki( $wikiID );
+
+		if ( $wiki ) {
+			return $wiki->getDisplayName();
+		}
+		return $wikiID;
+	}
+
+	/**
+	 * Convenience to get a link to a user page on a foreign wiki
+	 *
+	 * @param string $wikiID Wiki'd id (generally database name)
+	 * @param string $user User name (must be normalised before calling this function!)
+	 * @param string $text Link's text; optional, default to "User:$user"
+	 * @return string HTML link or false if the wiki was not found
+	 */
+	public static function foreignUserLink( $wikiID, $user, $text = null ) {
+		return self::makeForeignLink( $wikiID, "User:$user", $text );
+	}
+
+	/**
+	 * Convenience to get a link to a page on a foreign wiki
+	 *
+	 * @param string $wikiID Wiki'd id (generally database name)
+	 * @param string $page Page name (must be normalised before calling this function!)
+	 * @param string $text Link's text; optional, default to $page
+	 * @return string|false HTML link or false if the wiki was not found
+	 */
+	public static function makeForeignLink( $wikiID, $page, $text = null ) {
+		if ( !$text ) {
+			$text = $page;
+		}
+
+		$url = self::getForeignURL( $wikiID, $page );
+		if ( $url === false ) {
+			return false;
+		}
+
+		return Linker::makeExternalLink( $url, $text );
+	}
+
+	/**
+	 * Convenience to get a url to a page on a foreign wiki
+	 *
+	 * @param string $wikiID Wiki'd id (generally database name)
+	 * @param string $page Page name (must be normalised before calling this function!)
+	 * @param string|null $fragmentId
+	 *
+	 * @return string|bool URL or false if the wiki was not found
+	 */
+	public static function getForeignURL( $wikiID, $page, $fragmentId = null ) {
+		$wiki = self::getWiki( $wikiID );
+
+		if ( $wiki ) {
+			return $wiki->getFullUrl( $page, $fragmentId );
+		}
+
+		return false;
+	}
+
+	/**
+	 * Get canonical server info for all local wikis in the map that have one
+	 *
+	 * @return array Map of (local wiki ID => map of (url,parts))
+	 * @since 1.30
+	 */
+	public static function getCanonicalServerInfoForAllWikis() {
+		$cache = MediaWikiServices::getInstance()->getLocalServerObjectCache();
+
+		return $cache->getWithSetCallback(
+			$cache->makeGlobalKey( 'wikimap', 'canonical-urls' ),
+			$cache::TTL_DAY,
+			function () {
+				global $wgLocalDatabases, $wgCanonicalServer;
+
+				$infoMap = [];
+				// Make sure at least the current wiki is set, for simple configurations.
+				// This also makes it the first in the map, which is useful for common cases.
+				$infoMap[wfWikiID()] = [
+					'url' => $wgCanonicalServer,
+					'parts' => wfParseUrl( $wgCanonicalServer )
+				];
+
+				foreach ( $wgLocalDatabases as $wikiId ) {
+					$wikiReference = self::getWiki( $wikiId );
+					if ( $wikiReference ) {
+						$url = $wikiReference->getCanonicalServer();
+						$infoMap[$wikiId] = [ 'url' => $url, 'parts' => wfParseUrl( $url ) ];
+					}
+				}
+
+				return $infoMap;
+			}
+		);
+	}
+
+	/**
+	 * @param string $url
+	 * @return bool|string Wiki ID or false
+	 * @since 1.30
+	 */
+	public static function getWikiFromUrl( $url ) {
+		$urlPartsCheck = wfParseUrl( $url );
+		if ( $urlPartsCheck === false ) {
+			return false;
+		}
+
+		$urlPartsCheck = array_intersect_key( $urlPartsCheck, [ 'host' => 1, 'port' => 1 ] );
+		foreach ( self::getCanonicalServerInfoForAllWikis() as $wikiId => $info ) {
+			$urlParts = $info['parts'];
+			if ( $urlParts === false ) {
+				continue; // sanity
+			}
+
+			$urlParts = array_intersect_key( $urlParts, [ 'host' => 1, 'port' => 1 ] );
+			if ( $urlParts == $urlPartsCheck ) {
+				return $wikiId;
+			}
+		}
+
+		return false;
+	}
+
+	/**
+	 * Get the wiki ID of a database domain
+	 *
+	 * This is like DatabaseDomain::getId() without encoding (for legacy reasons)
+	 *
+	 * @param string|DatabaseDomain $domain
+	 * @return string
+	 */
+	public static function getWikiIdFromDomain( $domain ) {
+		if ( !( $domain instanceof DatabaseDomain ) ) {
+			$domain = DatabaseDomain::newFromId( $domain );
+		}
+
+		return strlen( $domain->getTablePrefix() )
+			? "{$domain->getDatabase()}-{$domain->getTablePrefix()}"
+			: $domain->getDatabase();
+	}
+
+	/**
+	 * @param DatabaseDomain|string $domain
+	 * @return bool Whether $domain has the same DB/prefix as the current wiki
+	 * @since 1.33
+	 */
+	public static function isCurrentWikiDbDomain( $domain ) {
+		$domain = DatabaseDomain::newFromId( $domain );
+		$curDomain = self::getCurrentWikiDbDomain();
+
+		if ( !in_array( $curDomain->getSchema(), [ null, 'mediawiki' ], true ) ) {
+			// Include the schema if it is set and is not the default placeholder.
+			// This means a site admin may have specifically taylored the schemas.
+			// Domain IDs might use the form <DB>-<project>-<language>, meaning that
+			// the schema portion must be accounted for to disambiguate wikis.
+			return $curDomain->equals( $domain );
+		}
+
+		return (
+			$curDomain->getDatabase() === $domain->getDatabase() &&
+			$curDomain->getTablePrefix() === $domain->getTablePrefix()
+		);
+	}
+
+	/**
+	 * @return DatabaseDomain Database domain of the current wiki
+	 * @since 1.33
+	 */
+	public static function getCurrentWikiDbDomain() {
+		global $wgDBname, $wgDBmwschema, $wgDBprefix;
+		// Avoid invoking LBFactory to avoid any chance of recursion
+		return new DatabaseDomain( $wgDBname, $wgDBmwschema, (string)$wgDBprefix );
+	}
+}