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<?php
/**
* @file
* Interwiki table entry
*/
/**
* The interwiki class
* All information is loaded on creation when called by Interwiki::fetch( $prefix ).
* All work is done on slave, because this should *never* change (except during schema updates etc, which arent wiki-related)
*/
class Interwiki {
// Cache - removes oldest entry when it hits limit
protected static $smCache = array();
const CACHE_LIMIT = 100; // 0 means unlimited, any other value is max number of entries.
protected $mPrefix, $mURL, $mLocal, $mTrans;
public function __construct( $prefix = null, $url = '', $local = 0, $trans = 0 ) {
$this->mPrefix = $prefix;
$this->mURL = $url;
$this->mLocal = $local;
$this->mTrans = $trans;
}
/**
* Check whether an interwiki prefix exists
*
* @param $prefix String: interwiki prefix to use
* @return Boolean: whether it exists
*/
static public function isValidInterwiki( $prefix ) {
$result = self::fetch( $prefix );
return (bool)$result;
}
/**
* Fetch an Interwiki object
*
* @param $prefix String: interwiki prefix to use
* @return Interwiki Object, or null if not valid
*/
static public function fetch( $prefix ) {
global $wgContLang;
if( $prefix == '' ) {
return null;
}
$prefix = $wgContLang->lc( $prefix );
if( isset( self::$smCache[$prefix] ) ) {
return self::$smCache[$prefix];
}
global $wgInterwikiCache;
if( $wgInterwikiCache ) {
$iw = Interwiki::getInterwikiCached( $prefix );
} else {
$iw = Interwiki::load( $prefix );
if( !$iw ) {
$iw = false;
}
}
if( self::CACHE_LIMIT && count( self::$smCache ) >= self::CACHE_LIMIT ) {
reset( self::$smCache );
unset( self::$smCache[ key( self::$smCache ) ] );
}
self::$smCache[$prefix] = $iw;
return $iw;
}
/**
* Fetch interwiki prefix data from local cache in constant database.
*
* @note More logic is explained in DefaultSettings.
*
* @param $prefix String: interwiki prefix
* @return Interwiki object
*/
protected static function getInterwikiCached( $prefix ) {
$value = self::getInterwikiCacheEntry( $prefix );
$s = new Interwiki( $prefix );
if ( $value != '' ) {
// Split values
list( $local, $url ) = explode( ' ', $value, 2 );
$s->mURL = $url;
$s->mLocal = (int)$local;
} else {
$s = false;
}
return $s;
}
/**
* Get entry from interwiki cache
*
* @note More logic is explained in DefaultSettings.
*
* @param $prefix String: database key
* @return String: the entry
*/
protected static function getInterwikiCacheEntry( $prefix ) {
global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
static $db, $site;
wfDebug( __METHOD__ . "( $prefix )\n" );
if( !$db ) {
$db = CdbReader::open( $wgInterwikiCache );
}
/* Resolve site name */
if( $wgInterwikiScopes>=3 && !$site ) {
$site = $db->get( '__sites:' . wfWikiID() );
if ( $site == '' ) {
$site = $wgInterwikiFallbackSite;
}
}
$value = $db->get( wfMemcKey( $prefix ) );
// Site level
if ( $value == '' && $wgInterwikiScopes >= 3 ) {
$value = $db->get( "_{$site}:{$prefix}" );
}
// Global Level
if ( $value == '' && $wgInterwikiScopes >= 2 ) {
$value = $db->get( "__global:{$prefix}" );
}
if ( $value == 'undef' )
$value = '';
return $value;
}
/**
* Load the interwiki, trying first memcached then the DB
*
* @param $prefix The interwiki prefix
* @return Boolean: the prefix is valid
*/
protected static function load( $prefix ) {
global $wgMemc, $wgInterwikiExpiry;
$key = wfMemcKey( 'interwiki', $prefix );
$mc = $wgMemc->get( $key );
$iw = false;
if( $mc && is_array( $mc ) ) { // is_array is hack for old keys
$iw = Interwiki::loadFromArray( $mc );
if( $iw ) {
return $iw;
}
}
$db = wfGetDB( DB_SLAVE );
$row = $db->fetchRow( $db->select( 'interwiki', '*', array( 'iw_prefix' => $prefix ),
__METHOD__ ) );
$iw = Interwiki::loadFromArray( $row );
if ( $iw ) {
$mc = array( 'iw_url' => $iw->mURL, 'iw_local' => $iw->mLocal, 'iw_trans' => $iw->mTrans );
$wgMemc->add( $key, $mc, $wgInterwikiExpiry );
return $iw;
}
return false;
}
/**
* Fill in member variables from an array (e.g. memcached result, Database::fetchRow, etc)
*
* @param $mc Associative array: row from the interwiki table
* @return Boolean: whether everything was there
*/
protected static function loadFromArray( $mc ) {
if( isset( $mc['iw_url'] ) && isset( $mc['iw_local'] ) && isset( $mc['iw_trans'] ) ) {
$iw = new Interwiki();
$iw->mURL = $mc['iw_url'];
$iw->mLocal = $mc['iw_local'];
$iw->mTrans = $mc['iw_trans'];
return $iw;
}
return false;
}
/**
* Get the URL for a particular title (or with $1 if no title given)
*
* @param $title String: what text to put for the article name
* @return String: the URL
*/
public function getURL( $title = null ) {
$url = $this->mURL;
if( $title != null ) {
$url = str_replace( "$1", $title, $url );
}
return $url;
}
/**
* Is this a local link from a sister project, or is
* it something outside, like Google
*
* @return Boolean
*/
public function isLocal() {
return $this->mLocal;
}
/**
* Can pages from this wiki be transcluded?
* Still requires $wgEnableScaryTransclusion
*
* @return Boolean
*/
public function isTranscludable() {
return $this->mTrans;
}
/**
* Get the name for the interwiki site
*
* @return String
*/
public function getName() {
$key = 'interwiki-name-' . $this->mPrefix;
$msg = wfMsgForContent( $key );
return wfEmptyMsg( $key, $msg ) ? '' : $msg;
}
/**
* Get a description for this interwiki
*
* @return String
*/
public function getDescription() {
$key = 'interwiki-desc-' . $this->mPrefix;
$msg = wfMsgForContent( $key );
return wfEmptyMsg( $key, $msg ) ? '' : $msg;
}
}