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<?php
namespace MediaWiki\Extension\TextExtracts;
use MediaWiki\Api\ApiBase;
use MediaWiki\Api\ApiQuery;
use MediaWiki\Api\ApiQueryBase;
use MediaWiki\Api\ApiUsageException;
use MediaWiki\Config\Config;
use MediaWiki\Config\ConfigFactory;
use MediaWiki\Languages\LanguageConverterFactory;
use MediaWiki\Logger\LoggerFactory;
use MediaWiki\Page\PageIdentity;
use MediaWiki\Page\ParserOutputAccess;
use MediaWiki\Page\WikiPage;
use MediaWiki\Page\WikiPageFactory;
use MediaWiki\Parser\ParserOptions;
use MediaWiki\Title\TitleFormatter;
use Wikimedia\ObjectCache\WANObjectCache;
use Wikimedia\ParamValidator\ParamValidator;
/**
* @license GPL-2.0-or-later
*/
class ApiQueryExtracts extends ApiQueryBase {
/**
* Bump when memcache needs clearing
*/
private const CACHE_VERSION = 3;
private const PREFIX = 'ex';
/**
* @var array
*/
private $params;
private Config $config;
private WANObjectCache $cache;
private LanguageConverterFactory $langConvFactory;
private ParserOutputAccess $parserOutputAccess;
private WikiPageFactory $wikiPageFactory;
private TitleFormatter $titleFormatter;
// TODO: Allow extensions to hook into this to opt-in.
// This is partly for security reasons; see T107170.
/**
* @var string[]
*/
private $supportedContentModels = [ 'wikitext' ];
public function __construct(
ApiQuery $query,
string $moduleName,
ConfigFactory $configFactory,
WANObjectCache $cache,
LanguageConverterFactory $langConvFactory,
ParserOutputAccess $parserOutputAccess,
WikiPageFactory $wikiPageFactory,
TitleFormatter $titleFormatter
) {
parent::__construct( $query, $moduleName, self::PREFIX );
$this->config = $configFactory->makeConfig( 'textextracts' );
$this->cache = $cache;
$this->langConvFactory = $langConvFactory;
$this->parserOutputAccess = $parserOutputAccess;
$this->wikiPageFactory = $wikiPageFactory;
$this->titleFormatter = $titleFormatter;
}
/**
* Evaluates the parameters, performs the requested extraction of text,
* and sets up the result
*/
public function execute() {
$titles = $this->getPageSet()->getGoodPages();
if ( $titles === [] ) {
return;
}
$isXml = $this->getMain()->isInternalMode()
|| $this->getMain()->getPrinter()->getFormat() == 'XML';
$result = $this->getResult();
$params = $this->params = $this->extractRequestParams();
$this->requireMaxOneParameter( $params, 'chars', 'sentences' );
$continue = 0;
$limit = intval( $params['limit'] );
if ( $limit > 1 && !$params['intro'] && count( $titles ) > 1 ) {
$limit = 1;
$this->addWarning( [ 'apiwarn-textextracts-limit', $limit ] );
}
if ( isset( $params['continue'] ) ) {
$continue = intval( $params['continue'] );
$this->dieContinueUsageIf( $continue < 0 || $continue > count( $titles ) );
$titles = array_slice( $titles, $continue, null, true );
}
$count = 0;
$titleInFileNamespace = false;
/** @var PageIdentity $t */
foreach ( $titles as $id => $t ) {
if ( ++$count > $limit ) {
$this->setContinueEnumParameter( 'continue', $continue + $count - 1 );
break;
}
if ( $t->getNamespace() === NS_FILE ) {
$text = '';
$titleInFileNamespace = true;
} else {
$params = $this->params;
$text = $this->getExtract( $t );
$text = $this->truncate( $text );
if ( $params['plaintext'] ) {
$text = $this->doSections( $text );
} else {
if ( $params['sentences'] ) {
$this->addWarning( $this->msg( 'apiwarn-textextracts-sentences-and-html', self::PREFIX ) );
}
$this->addWarning( 'apiwarn-textextracts-malformed-html' );
}
}
if ( $isXml ) {
$fit = $result->addValue( [ 'query', 'pages', $id ], 'extract', [ '*' => $text ] );
} else {
$fit = $result->addValue( [ 'query', 'pages', $id ], 'extract', $text );
}
if ( !$fit ) {
$this->setContinueEnumParameter( 'continue', $continue + $count - 1 );
break;
}
}
if ( $titleInFileNamespace ) {
$this->addWarning( 'apiwarn-textextracts-title-in-file-namespace' );
}
}
/**
* @param array $params Ignored parameters
* @return string
*/
public function getCacheMode( $params ) {
return 'public';
}
/**
* Returns a processed, but not trimmed extract
* @param PageIdentity $title
* @return string
*/
private function getExtract( PageIdentity $title ) {
$page = $this->wikiPageFactory->newFromTitle( $title );
$contentModel = $page->getContentModel();
if ( !in_array( $contentModel, $this->supportedContentModels, true ) ) {
$this->addWarning( [
'apiwarn-textextracts-unsupportedmodel',
wfEscapeWikiText( $this->titleFormatter->getPrefixedText( $title ) ),
$contentModel
] );
return '';
}
$introOnly = $this->params['intro'];
$text = $this->getFromCache( $page, $introOnly );
// if we need just first section, try retrieving full page and getting first section out of it
if ( $text === false && $introOnly ) {
$text = $this->getFromCache( $page, false );
if ( $text !== false ) {
$text = $this->getFirstSection( $text, $this->params['plaintext'] );
}
}
if ( $text === false ) {
$text = $this->parse( $page );
$text = $this->convertText( $text );
$this->setCache( $page, $text );
}
return $text;
}
/**
* @param WANObjectCache $cache
* @param WikiPage $page
* @param bool $introOnly
* @return string
*/
private function cacheKey( WANObjectCache $cache, WikiPage $page, $introOnly ) {
$langConv = $this->langConvFactory->getLanguageConverter( $page->getTitle()->getPageLanguage() );
return $cache->makeKey( 'textextracts', self::CACHE_VERSION,
$page->getId(), $page->getTouched(),
$langConv->getPreferredVariant(),
$this->params['plaintext'] ? 'plaintext' : 'html',
$introOnly ? 'intro' : 'full'
);
}
/**
* @param WikiPage $page
* @param bool $introOnly
* @return string|false
*/
private function getFromCache( WikiPage $page, $introOnly ) {
$cache = $this->cache;
// @TODO: replace with getWithSetCallback()
$key = $this->cacheKey( $cache, $page, $introOnly );
return $cache->get( $key );
}
/**
* @param WikiPage $page
* @param string $text
*/
private function setCache( WikiPage $page, $text ) {
$cache = $this->cache;
// @TODO: replace with getWithSetCallback()
$key = $this->cacheKey( $cache, $page, $this->params['intro'] );
$cache->set( $key, $text, $this->getConfig()->get( 'ParserCacheExpireTime' ) );
}
/**
* @param string $text
* @param bool $plainText
* @return string
*/
private function getFirstSection( $text, $plainText ) {
if ( $plainText ) {
$regexp = '/^(.*?)(?=' . ExtractFormatter::SECTION_MARKER_START . ')/s';
} else {
$regexp = '/^(.*?)(?=<h[1-6]\b)/s';
}
if ( preg_match( $regexp, $text, $matches ) ) {
$text = $matches[0];
}
return $text;
}
/**
* Returns page HTML
* @param WikiPage $page
* @return string
* @throws ApiUsageException
*/
private function parse( WikiPage $page ) {
$status = $this->parserOutputAccess->getParserOutput(
$page->toPageRecord(),
ParserOptions::newFromAnon()
);
if ( $status->isOK() ) {
$pout = $status->getValue();
$text = $pout->getRawText();
if ( $this->params['intro'] ) {
$text = $this->getFirstSection( $text, false );
}
return $text;
} else {
LoggerFactory::getInstance( 'textextracts' )->warning(
'Parse attempt failed while generating text extract', [
'title' => $page->getTitle()->getFullText(),
'url' => $this->getRequest()->getFullRequestURL(),
'reason' => $status->getWikiText( false, false, 'en' )
] );
$this->dieStatus( $status );
}
}
/**
* Converts page HTML into an extract
* @param string $text
* @return string
*/
private function convertText( $text ) {
$fmt = new ExtractFormatter( $text, $this->params['plaintext'] );
$fmt->remove( $this->config->get( 'ExtractsRemoveClasses' ) );
$text = $fmt->getText();
return $text;
}
/**
* Truncate the given text to a certain number of characters or sentences
* @param string $text The text to truncate
* @return string
*/
private function truncate( $text ) {
$useTidy = !$this->params['plaintext'];
$truncator = new TextTruncator( $useTidy );
if ( $this->params['chars'] ) {
$truncatedText = $truncator->getFirstChars( $text, $this->params['chars'] );
if ( $truncatedText !== $text ) {
$text = $truncatedText . $this->msg( 'ellipsis' )->text();
}
} elseif ( $this->params['sentences'] ) {
$text = $truncator->getFirstSentences( $text, $this->params['sentences'] );
}
return $text;
}
/**
* @param string $text
* @return string
*/
private function doSections( $text ) {
$pattern = '/' .
ExtractFormatter::SECTION_MARKER_START . '(\d)' .
ExtractFormatter::SECTION_MARKER_END . '(.*)/';
switch ( $this->params['sectionformat'] ) {
case 'raw':
return $text;
case 'wiki':
return preg_replace_callback( $pattern, static function ( $matches ) {
$bars = str_repeat( '=', $matches[1] );
return "\n$bars " . trim( $matches[2] ) . " $bars";
}, $text );
case 'plain':
return preg_replace_callback( $pattern, static function ( $matches ) {
return "\n" . trim( $matches[2] );
}, $text );
default:
throw new \LogicException( 'Invalid sectionformat' );
}
}
/**
* @inheritDoc
*/
public function getAllowedParams() {
return [
'chars' => [
ApiBase::PARAM_TYPE => 'integer',
ApiBase::PARAM_MIN => 1,
ApiBase::PARAM_MAX => 1200,
],
'sentences' => [
ApiBase::PARAM_TYPE => 'integer',
ApiBase::PARAM_MIN => 1,
ApiBase::PARAM_MAX => 10,
],
'limit' => [
ParamValidator::PARAM_DEFAULT => 20,
ApiBase::PARAM_TYPE => 'limit',
ApiBase::PARAM_MIN => 1,
ApiBase::PARAM_MAX => 20,
ApiBase::PARAM_MAX2 => 20,
],
'intro' => false,
'plaintext' => false,
'sectionformat' => [
ApiBase::PARAM_TYPE => [ 'plain', 'wiki', 'raw' ],
ParamValidator::PARAM_DEFAULT => 'wiki',
ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
],
'continue' => [
ApiBase::PARAM_TYPE => 'integer',
ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
],
];
}
/**
* @inheritDoc
*/
protected function getExamplesMessages() {
return [
'action=query&prop=extracts&exchars=175&titles=Therion'
=> 'apihelp-query+extracts-example-1',
];
}
/**
* @inheritDoc
*/
public function getHelpUrls() {
return 'https://www.mediawiki.org/wiki/Special:MyLanguage/Extension:TextExtracts#API';
}
}