WikiMap.php

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<?php
class WikiMap {

    public static function getWiki( $wikiID ) {
        global $wgConf;

        $wgConf->loadFullData();

        list( $major, $minor ) = $wgConf->siteFromDB( $wikiID );
        if ( $major === null ) {
            return null;
        }
        $server = $wgConf->get( 'wgServer', $wikiID, $major,
            array( 'lang' => $minor, 'site' => $major ) );

        $canonicalServer = $wgConf->get( 'wgCanonicalServer', $wikiID, $major,
            array( 'lang' => $minor, 'site' => $major ) );
        if ( $canonicalServer === false || $canonicalServer === null ) {
            $canonicalServer = $server;
        }

        $path = $wgConf->get( 'wgArticlePath', $wikiID, $major,
            array( 'lang' => $minor, 'site' => $major ) );
        return new WikiReference( $major, $minor, $canonicalServer, $path, $server );
    }

    public static function getWikiName( $wikiID ) {
        $wiki = WikiMap::getWiki( $wikiID );

        if ( $wiki ) {
            return $wiki->getDisplayName();
        }
        return $wikiID;
    }

    public static function foreignUserLink( $wikiID, $user, $text = null ) {
        return self::makeForeignLink( $wikiID, "User:$user", $text );
    }

    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 );
    }

    public static function getForeignURL( $wikiID, $page ) {
        $wiki = WikiMap::getWiki( $wikiID );

        if ( $wiki ) {
            return $wiki->getFullUrl( $page );
        }

        return false;
    }
}

class WikiReference {
    private $mMinor; 
    private $mMajor; 
    private $mCanonicalServer; 
    private $mServer; 
    private $mPath;   

    public function __construct( $major, $minor, $canonicalServer, $path, $server = null ) {
        $this->mMajor = $major;
        $this->mMinor = $minor;
        $this->mCanonicalServer = $canonicalServer;
        $this->mPath = $path;
        $this->mServer = $server === null ? $canonicalServer : $server;
    }

    public function getHostname() {
        $prefixes = array( 'http://', 'https://' );
        foreach ( $prefixes as $prefix ) {
            if ( substr( $this->mCanonicalServer, 0, strlen( $prefix ) ) ) {
                return substr( $this->mCanonicalServer, strlen( $prefix ) );
            }
        }
        throw new MWException( "Invalid hostname for wiki {$this->mMinor}.{$this->mMajor}" );
    }

    public function getDisplayName() {
        $url = $this->getUrl( '' );
        $parsed = wfParseUrl( $url );
        if ( $parsed ) {
            return $parsed['host'];
        } else {
            // Invalid URL. There's no sane thing to do here, so just return it
            return $url;
        }
    }

    private function getLocalUrl( $page ) {
        return str_replace( '$1', wfUrlEncode( str_replace( ' ', '_', $page ) ), $this->mPath );
    }

    public function getCanonicalUrl( $page ) {
        return $this->mCanonicalServer . $this->getLocalUrl( $page );
    }

    public function getCanonicalServer() {
        return $this->mCanonicalServer;
    }

    public function getUrl( $page ) {
        return $this->getCanonicalUrl( $page );
    }

    public function getFullUrl( $page ) {
        return $this->mServer .
            $this->getLocalUrl( $page );
    }
}