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<?php
/**
* Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
*
* 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
*/
namespace MediaWiki\Api;
use MediaWiki\Cache\LinkBatchFactory;
use MediaWiki\Linker\LinksMigration;
use MediaWiki\ParamValidator\TypeDef\NamespaceDef;
use MediaWiki\Title\Title;
use Wikimedia\ParamValidator\ParamValidator;
use Wikimedia\ParamValidator\TypeDef\IntegerDef;
/**
* A query module to list all wiki links on a given set of pages.
*
* @ingroup API
*/
class ApiQueryLinks extends ApiQueryGeneratorBase {
private const LINKS = 'links';
private const TEMPLATES = 'templates';
private string $table;
private string $prefix;
private string $titlesParam;
private string $helpUrl;
private LinkBatchFactory $linkBatchFactory;
private LinksMigration $linksMigration;
public function __construct(
ApiQuery $query,
string $moduleName,
LinkBatchFactory $linkBatchFactory,
LinksMigration $linksMigration
) {
switch ( $moduleName ) {
case self::LINKS:
$this->table = 'pagelinks';
$this->prefix = 'pl';
$this->titlesParam = 'titles';
$this->helpUrl = 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Links';
break;
case self::TEMPLATES:
$this->table = 'templatelinks';
$this->prefix = 'tl';
$this->titlesParam = 'templates';
$this->helpUrl = 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Templates';
break;
default:
ApiBase::dieDebug( __METHOD__, 'Unknown module name' );
}
parent::__construct( $query, $moduleName, $this->prefix );
$this->linkBatchFactory = $linkBatchFactory;
$this->linksMigration = $linksMigration;
}
public function execute() {
$this->run();
}
public function getCacheMode( $params ) {
return 'public';
}
public function executeGenerator( $resultPageSet ) {
$this->run( $resultPageSet );
}
/**
* @param ApiPageSet|null $resultPageSet
*/
private function run( $resultPageSet = null ) {
$pages = $this->getPageSet()->getGoodPages();
if ( $pages === [] ) {
return; // nothing to do
}
$params = $this->extractRequestParams();
if ( isset( $this->linksMigration::$mapping[$this->table] ) ) {
[ $nsField, $titleField ] = $this->linksMigration->getTitleFields( $this->table );
$queryInfo = $this->linksMigration->getQueryInfo( $this->table );
$this->addTables( $queryInfo['tables'] );
$this->addJoinConds( $queryInfo['joins'] );
} else {
$this->addTables( $this->table );
$nsField = $this->prefix . '_namespace';
$titleField = $this->prefix . '_title';
}
$this->addFields( [
'pl_from' => $this->prefix . '_from',
'pl_namespace' => $nsField,
'pl_title' => $titleField,
] );
$this->addWhereFld( $this->prefix . '_from', array_keys( $pages ) );
$multiNS = true;
$multiTitle = true;
if ( $params[$this->titlesParam] ) {
// Filter the titles in PHP so our ORDER BY bug avoidance below works right.
$filterNS = $params['namespace'] ? array_fill_keys( $params['namespace'], true ) : false;
$lb = $this->linkBatchFactory->newLinkBatch();
foreach ( $params[$this->titlesParam] as $t ) {
$title = Title::newFromText( $t );
if ( !$title || $title->isExternal() ) {
$this->addWarning( [ 'apiwarn-invalidtitle', wfEscapeWikiText( $t ) ] );
} elseif ( !$filterNS || isset( $filterNS[$title->getNamespace()] ) ) {
$lb->addObj( $title );
}
}
if ( $lb->isEmpty() ) {
// No titles, no results!
return;
}
$cond = $lb->constructSet( $this->prefix, $this->getDB() );
$this->addWhere( $cond );
$multiNS = count( $lb->data ) !== 1;
$multiTitle = count( array_merge( ...$lb->data ) ) !== 1;
} elseif ( $params['namespace'] ) {
$this->addWhereFld( $nsField, $params['namespace'] );
$multiNS = $params['namespace'] === null || count( $params['namespace'] ) !== 1;
}
if ( $params['continue'] !== null ) {
$db = $this->getDB();
$cont = $this->parseContinueParamOrDie( $params['continue'], [ 'int', 'int', 'string' ] );
$op = $params['dir'] == 'descending' ? '<=' : '>=';
$this->addWhere( $db->buildComparison( $op, [
"{$this->prefix}_from" => $cont[0],
$nsField => $cont[1],
$titleField => $cont[2],
] ) );
}
$sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
// Here's some MySQL craziness going on: if you use WHERE foo='bar'
// and later ORDER BY foo MySQL doesn't notice the ORDER BY is pointless
// but instead goes and filesorts, because the index for foo was used
// already. To work around this, we drop constant fields in the WHERE
// clause from the ORDER BY clause
$order = [];
if ( count( $pages ) !== 1 ) {
$order[] = $this->prefix . '_from' . $sort;
}
if ( $multiNS ) {
$order[] = $nsField . $sort;
}
if ( $multiTitle ) {
$order[] = $titleField . $sort;
}
if ( $order ) {
$this->addOption( 'ORDER BY', $order );
}
$this->addOption( 'LIMIT', $params['limit'] + 1 );
$res = $this->select( __METHOD__ );
if ( $resultPageSet === null ) {
$this->executeGenderCacheFromResultWrapper( $res, __METHOD__, 'pl' );
$count = 0;
foreach ( $res as $row ) {
if ( ++$count > $params['limit'] ) {
// We've reached the one extra which shows that
// there are additional pages to be had. Stop here...
$this->setContinueEnumParameter( 'continue',
"{$row->pl_from}|{$row->pl_namespace}|{$row->pl_title}" );
break;
}
$vals = [];
ApiQueryBase::addTitleInfo( $vals, Title::makeTitle( $row->pl_namespace, $row->pl_title ) );
$fit = $this->addPageSubItem( $row->pl_from, $vals );
if ( !$fit ) {
$this->setContinueEnumParameter( 'continue',
"{$row->pl_from}|{$row->pl_namespace}|{$row->pl_title}" );
break;
}
}
} else {
$titles = [];
$count = 0;
foreach ( $res as $row ) {
if ( ++$count > $params['limit'] ) {
// We've reached the one extra which shows that
// there are additional pages to be had. Stop here...
$this->setContinueEnumParameter( 'continue',
"{$row->pl_from}|{$row->pl_namespace}|{$row->pl_title}" );
break;
}
$titles[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
}
$resultPageSet->populateFromTitles( $titles );
}
}
public function getAllowedParams() {
return [
'namespace' => [
ParamValidator::PARAM_TYPE => 'namespace',
ParamValidator::PARAM_ISMULTI => true,
NamespaceDef::PARAM_EXTRA_NAMESPACES => [ NS_MEDIA, NS_SPECIAL ],
],
'limit' => [
ParamValidator::PARAM_DEFAULT => 10,
ParamValidator::PARAM_TYPE => 'limit',
IntegerDef::PARAM_MIN => 1,
IntegerDef::PARAM_MAX => ApiBase::LIMIT_BIG1,
IntegerDef::PARAM_MAX2 => ApiBase::LIMIT_BIG2
],
'continue' => [
ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
],
$this->titlesParam => [
ParamValidator::PARAM_ISMULTI => true,
],
'dir' => [
ParamValidator::PARAM_DEFAULT => 'ascending',
ParamValidator::PARAM_TYPE => [
'ascending',
'descending'
]
],
];
}
protected function getExamplesMessages() {
$name = $this->getModuleName();
$path = $this->getModulePath();
$title = Title::newMainPage()->getPrefixedText();
$mp = rawurlencode( $title );
return [
"action=query&prop={$name}&titles={$mp}"
=> "apihelp-{$path}-example-simple",
"action=query&generator={$name}&titles={$mp}&prop=info"
=> "apihelp-{$path}-example-generator",
"action=query&prop={$name}&titles={$mp}&{$this->prefix}namespace=2|10"
=> "apihelp-{$path}-example-namespaces",
];
}
public function getHelpUrls() {
return $this->helpUrl;
}
}
/** @deprecated class alias since 1.43 */
class_alias( ApiQueryLinks::class, 'ApiQueryLinks' );