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<?php
/**
* Interwiki table entry.
*
* 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 \Cdb\Exception as CdbException;
use \Cdb\Reader as CdbReader;
/**
* 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 aren't wiki-related)
*/
class Interwiki {
// Cache - removes oldest entry when it hits limit
protected static $smCache = [];
const CACHE_LIMIT = 100; // 0 means unlimited, any other value is max number of entries.
/** @var string The interwiki prefix, (e.g. "Meatball", or the language prefix "de") */
protected $mPrefix;
/** @var string The URL of the wiki, with "$1" as a placeholder for an article name. */
protected $mURL;
/** @var string The URL of the file api.php */
protected $mAPI;
/** @var string The name of the database (for a connection to be established
* with wfGetLB( 'wikiid' ))
*/
protected $mWikiID;
/** @var bool Whether the wiki is in this project */
protected $mLocal;
/** @var bool Whether interwiki transclusions are allowed */
protected $mTrans;
public function __construct( $prefix = null, $url = '', $api = '', $wikiId = '', $local = 0,
$trans = 0
) {
$this->mPrefix = $prefix;
$this->mURL = $url;
$this->mAPI = $api;
$this->mWikiID = $wikiId;
$this->mLocal = (bool)$local;
$this->mTrans = (bool)$trans;
}
/**
* Check whether an interwiki prefix exists
*
* @param string $prefix Interwiki prefix to use
* @return bool Whether it exists
*/
public static function isValidInterwiki( $prefix ) {
$result = self::fetch( $prefix );
return (bool)$result;
}
/**
* Fetch an Interwiki object
*
* @param string $prefix Interwiki prefix to use
* @return Interwiki|null|bool
*/
public static 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 $iw;
}
/**
* Resets locally cached Interwiki objects. This is intended for use during testing only.
* This does not invalidate entries in the persistent cache, as invalidateCache() does.
* @since 1.27
*/
public static function resetLocalCache() {
static::$smCache = [];
}
/**
* Purge the cache (local and persistent) for an interwiki prefix.
* @param string $prefix
* @since 1.26
*/
public static function invalidateCache( $prefix ) {
$cache = ObjectCache::getMainWANInstance();
$key = wfMemcKey( 'interwiki', $prefix );
$cache->delete( $key );
unset( static::$smCache[$prefix] );
}
/**
* Fetch interwiki prefix data from local cache in constant database.
*
* @note More logic is explained in DefaultSettings.
*
* @param string $prefix Interwiki prefix
* @return Interwiki
*/
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;
$s->mLocal = (bool)$local;
} else {
$s = false;
}
return $s;
}
/**
* Get entry from interwiki cache
*
* @note More logic is explained in DefaultSettings.
*
* @param string $prefix Database key
* @return bool|string The interwiki entry or false if not found
*/
protected static function getInterwikiCacheEntry( $prefix ) {
global $wgInterwikiScopes, $wgInterwikiFallbackSite;
static $site;
wfDebug( __METHOD__ . "( $prefix )\n" );
$value = false;
try {
// Resolve site name
if ( $wgInterwikiScopes >= 3 && !$site ) {
$site = self::getCacheValue( '__sites:' . wfWikiID() );
if ( $site == '' ) {
$site = $wgInterwikiFallbackSite;
}
}
$value = self::getCacheValue( wfMemcKey( $prefix ) );
// Site level
if ( $value == '' && $wgInterwikiScopes >= 3 ) {
$value = self::getCacheValue( "_{$site}:{$prefix}" );
}
// Global Level
if ( $value == '' && $wgInterwikiScopes >= 2 ) {
$value = self::getCacheValue( "__global:{$prefix}" );
}
if ( $value == 'undef' ) {
$value = '';
}
} catch ( CdbException $e ) {
wfDebug( __METHOD__ . ": CdbException caught, error message was "
. $e->getMessage() );
}
return $value;
}
private static function getCacheValue( $key ) {
global $wgInterwikiCache;
static $reader;
if ( $reader === null ) {
$reader = is_array( $wgInterwikiCache ) ? false : CdbReader::open( $wgInterwikiCache );
}
if ( $reader ) {
return $reader->get( $key );
} else {
return isset( $wgInterwikiCache[$key] ) ? $wgInterwikiCache[$key] : false;
}
}
/**
* Load the interwiki, trying first memcached then the DB
*
* @param string $prefix The interwiki prefix
* @return Interwiki|bool Interwiki if $prefix is valid, otherwise false
*/
protected static function load( $prefix ) {
global $wgInterwikiExpiry;
$iwData = [];
if ( !Hooks::run( 'InterwikiLoadPrefix', [ $prefix, &$iwData ] ) ) {
return Interwiki::loadFromArray( $iwData );
}
if ( is_array( $iwData ) ) {
$iw = Interwiki::loadFromArray( $iwData );
if ( $iw ) {
return $iw; // handled by hook
}
}
$iwData = ObjectCache::getMainWANInstance()->getWithSetCallback(
wfMemcKey( 'interwiki', $prefix ),
$wgInterwikiExpiry,
function ( $oldValue, &$ttl, array &$setOpts ) use ( $prefix ) {
$dbr = wfGetDB( DB_SLAVE );
$setOpts += Database::getCacheSetOptions( $dbr );
$row = $dbr->selectRow(
'interwiki',
Interwiki::selectFields(),
[ 'iw_prefix' => $prefix ],
__METHOD__
);
return $row ? (array)$row : '!NONEXISTENT';
}
);
if ( is_array( $iwData ) ) {
return Interwiki::loadFromArray( $iwData ) ?: false;
}
return false;
}
/**
* Fill in member variables from an array (e.g. memcached result, Database::fetchRow, etc)
*
* @param array $mc Associative array: row from the interwiki table
* @return Interwiki|bool Interwiki object or false if $mc['iw_url'] is not set
*/
protected static function loadFromArray( $mc ) {
if ( isset( $mc['iw_url'] ) ) {
$iw = new Interwiki();
$iw->mURL = $mc['iw_url'];
$iw->mLocal = isset( $mc['iw_local'] ) ? (bool)$mc['iw_local'] : false;
$iw->mTrans = isset( $mc['iw_trans'] ) ? (bool)$mc['iw_trans'] : false;
$iw->mAPI = isset( $mc['iw_api'] ) ? $mc['iw_api'] : '';
$iw->mWikiID = isset( $mc['iw_wikiid'] ) ? $mc['iw_wikiid'] : '';
return $iw;
}
return false;
}
/**
* Fetch all interwiki prefixes from interwiki cache
*
* @param null|string $local If not null, limits output to local/non-local interwikis
* @return array List of prefixes
* @since 1.19
*/
protected static function getAllPrefixesCached( $local ) {
global $wgInterwikiScopes, $wgInterwikiFallbackSite;
static $site;
wfDebug( __METHOD__ . "()\n" );
$data = [];
try {
/* Resolve site name */
if ( $wgInterwikiScopes >= 3 && !$site ) {
$site = self::getCacheValue( '__sites:' . wfWikiID() );
if ( $site == '' ) {
$site = $wgInterwikiFallbackSite;
}
}
// List of interwiki sources
$sources = [];
// Global Level
if ( $wgInterwikiScopes >= 2 ) {
$sources[] = '__global';
}
// Site level
if ( $wgInterwikiScopes >= 3 ) {
$sources[] = '_' . $site;
}
$sources[] = wfWikiID();
foreach ( $sources as $source ) {
$list = self::getCacheValue( '__list:' . $source );
foreach ( explode( ' ', $list ) as $iw_prefix ) {
$row = self::getCacheValue( "{$source}:{$iw_prefix}" );
if ( !$row ) {
continue;
}
list( $iw_local, $iw_url ) = explode( ' ', $row );
if ( $local !== null && $local != $iw_local ) {
continue;
}
$data[$iw_prefix] = [
'iw_prefix' => $iw_prefix,
'iw_url' => $iw_url,
'iw_local' => $iw_local,
];
}
}
} catch ( CdbException $e ) {
wfDebug( __METHOD__ . ": CdbException caught, error message was "
. $e->getMessage() );
}
ksort( $data );
return array_values( $data );
}
/**
* Fetch all interwiki prefixes from DB
*
* @param string|null $local If not null, limits output to local/non-local interwikis
* @return array List of prefixes
* @since 1.19
*/
protected static function getAllPrefixesDB( $local ) {
$db = wfGetDB( DB_SLAVE );
$where = [];
if ( $local !== null ) {
if ( $local == 1 ) {
$where['iw_local'] = 1;
} elseif ( $local == 0 ) {
$where['iw_local'] = 0;
}
}
$res = $db->select( 'interwiki',
self::selectFields(),
$where, __METHOD__, [ 'ORDER BY' => 'iw_prefix' ]
);
$retval = [];
foreach ( $res as $row ) {
$retval[] = (array)$row;
}
return $retval;
}
/**
* Returns all interwiki prefixes
*
* @param string|null $local If set, limits output to local/non-local interwikis
* @return array List of prefixes
* @since 1.19
*/
public static function getAllPrefixes( $local = null ) {
global $wgInterwikiCache;
if ( $wgInterwikiCache ) {
return self::getAllPrefixesCached( $local );
}
return self::getAllPrefixesDB( $local );
}
/**
* Get the URL for a particular title (or with $1 if no title given)
*
* @param string $title What text to put for the article name
* @return string The URL
* @note Prior to 1.19 The getURL with an argument was broken.
* If you if you use this arg in an extension that supports MW earlier
* than 1.19 please wfUrlencode and substitute $1 on your own.
*/
public function getURL( $title = null ) {
$url = $this->mURL;
if ( $title !== null ) {
$url = str_replace( "$1", wfUrlencode( $title ), $url );
}
return $url;
}
/**
* Get the API URL for this wiki
*
* @return string The URL
*/
public function getAPI() {
return $this->mAPI;
}
/**
* Get the DB name for this wiki
*
* @return string The DB name
*/
public function getWikiID() {
return $this->mWikiID;
}
/**
* Is this a local link from a sister project, or is
* it something outside, like Google
*
* @return bool
*/
public function isLocal() {
return $this->mLocal;
}
/**
* Can pages from this wiki be transcluded?
* Still requires $wgEnableScaryTransclusion
*
* @return bool
*/
public function isTranscludable() {
return $this->mTrans;
}
/**
* Get the name for the interwiki site
*
* @return string
*/
public function getName() {
$msg = wfMessage( 'interwiki-name-' . $this->mPrefix )->inContentLanguage();
return !$msg->exists() ? '' : $msg->text();
}
/**
* Get a description for this interwiki
*
* @return string
*/
public function getDescription() {
$msg = wfMessage( 'interwiki-desc-' . $this->mPrefix )->inContentLanguage();
return !$msg->exists() ? '' : $msg->text();
}
/**
* Return the list of interwiki fields that should be selected to create
* a new Interwiki object.
* @return string[]
*/
public static function selectFields() {
return [
'iw_prefix',
'iw_url',
'iw_api',
'iw_wikiid',
'iw_local',
'iw_trans'
];
}
}