mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/TextExtracts
synced 2024-11-14 19:30:37 +00:00
480 lines
13 KiB
PHP
480 lines
13 KiB
PHP
<?php
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/**
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*/
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namespace TextExtracts;
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use ApiBase;
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use ApiMain;
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use ApiQueryBase;
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use BagOStuff;
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use Config;
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use FauxRequest;
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use MediaWiki\Logger\LoggerFactory;
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use MediaWiki\MediaWikiServices;
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use MWTidy;
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use ParserOptions;
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use Title;
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use ApiUsageException;
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use UsageException;
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use User;
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use WikiPage;
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class ApiQueryExtracts extends ApiQueryBase {
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/**
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* Bump when memcache needs clearing
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*/
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const CACHE_VERSION = 2;
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/**
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* @var string
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*/
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const PREFIX = 'ex';
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/**
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* @var ParserOptions
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*/
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private $parserOptions;
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private $params;
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/**
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* @var Config
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*/
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private $config;
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// TODO: Allow extensions to hook into this to opt-in.
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// This is partly for security reasons; see T107170.
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/**
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* @var array
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*/
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private $supportedContentModels = [ 'wikitext' ];
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/**
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* @param \ApiQuery $query API query module object
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* @param string $moduleName Name of this query module
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* @param Config $conf MediaWiki configuration
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* @return ApiQueryExtracts
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*/
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public function __construct( $query, $moduleName, Config $conf ) {
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parent::__construct( $query, $moduleName, self::PREFIX );
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$this->config = $conf;
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}
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/**
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* Evaluates the parameters, performs the requested extraction of text,
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* and sets up the result
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* @return null
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*/
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public function execute() {
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$titles = $this->getPageSet()->getGoodTitles();
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if ( count( $titles ) == 0 ) {
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return;
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}
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$isXml = $this->getMain()->isInternalMode()
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|| $this->getMain()->getPrinter()->getFormat() == 'XML';
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$result = $this->getResult();
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$params = $this->params = $this->extractRequestParams();
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$this->requireMaxOneParameter( $params, 'chars', 'sentences' );
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$continue = 0;
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$limit = intval( $params['limit'] );
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if ( $limit > 1 && !$params['intro'] ) {
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$limit = 1;
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$this->addWarning( [ 'apiwarn-textextracts-limit', $limit ] );
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}
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if ( isset( $params['continue'] ) ) {
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$continue = intval( $params['continue'] );
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$this->dieContinueUsageIf( $continue < 0 || $continue > count( $titles ) );
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$titles = array_slice( $titles, $continue, null, true );
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}
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$count = 0;
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$titleInFileNamespace = false;
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/** @var Title $t */
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foreach ( $titles as $id => $t ) {
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if ( ++$count > $limit ) {
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$this->setContinueEnumParameter( 'continue', $continue + $count - 1 );
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break;
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}
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if ( $t->inNamespace( NS_FILE ) ) {
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$text = '';
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$titleInFileNamespace = true;
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} else {
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$params = $this->params;
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$text = $this->getExtract( $t );
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$text = $this->truncate( $text );
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if ( $params['plaintext'] ) {
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$text = $this->doSections( $text );
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} else {
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if ( $params['sentences'] ) {
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$this->addWarning( $this->msg( 'apiwarn-textextracts-sentences-and-html', self::PREFIX ) );
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}
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$this->addWarning( 'apiwarn-textextracts-malformed-html' );
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}
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}
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if ( $isXml ) {
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$fit = $result->addValue( [ 'query', 'pages', $id ], 'extract', [ '*' => $text ] );
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} else {
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$fit = $result->addValue( [ 'query', 'pages', $id ], 'extract', $text );
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}
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if ( !$fit ) {
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$this->setContinueEnumParameter( 'continue', $continue + $count - 1 );
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break;
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}
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}
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if ( $titleInFileNamespace ) {
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$this->addWarning( 'apiwarn-textextracts-title-in-file-namespace' );
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}
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}
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/**
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* @param array $params Ignored parameters
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* @return string
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*/
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public function getCacheMode( $params ) {
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return 'public';
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}
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/**
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* Returns a processed, but not trimmed extract
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* @param Title $title
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* @return string
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*/
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private function getExtract( Title $title ) {
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$contentModel = $title->getContentModel();
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if ( !in_array( $contentModel, $this->supportedContentModels, true ) ) {
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$this->addWarning( [
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'apiwarn-textextracts-unsupportedmodel',
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wfEscapeWikiText( $title->getPrefixedText() ),
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$contentModel
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] );
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return '';
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}
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$page = WikiPage::factory( $title );
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$introOnly = $this->params['intro'];
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$text = $this->getFromCache( $page, $introOnly );
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// if we need just first section, try retrieving full page and getting first section out of it
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if ( $text === false && $introOnly ) {
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$text = $this->getFromCache( $page, false );
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if ( $text !== false ) {
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$text = $this->getFirstSection( $text, $this->params['plaintext'] );
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}
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}
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if ( $text === false ) {
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$text = $this->parse( $page );
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$text = $this->convertText( $text );
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$this->setCache( $page, $text );
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}
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return $text;
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}
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private function cacheKey( BagOStuff $cache, WikiPage $page, $introOnly ) {
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return $cache->makeKey( 'textextracts', self::CACHE_VERSION,
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$page->getId(), $page->getTouched(),
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$page->getTitle()->getPageLanguage()->getPreferredVariant(),
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$this->params['plaintext'], $introOnly
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);
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}
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private function getFromCache( WikiPage $page, $introOnly ) {
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global $wgMemc;
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$key = $this->cacheKey( $wgMemc, $page, $introOnly );
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return $wgMemc->get( $key );
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}
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private function setCache( WikiPage $page, $text ) {
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global $wgMemc;
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$key = $this->cacheKey( $wgMemc, $page, $this->params['intro'] );
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$wgMemc->set( $key, $text, $this->getConfig()->get( 'ParserCacheExpireTime' ) );
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}
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private function getFirstSection( $text, $plainText ) {
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if ( $plainText ) {
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$regexp = '/^(.*?)(?=' . ExtractFormatter::SECTION_MARKER_START . ')/s';
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} else {
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$regexp = '/^(.*?)(?=<h[1-6]\b)/s';
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}
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if ( preg_match( $regexp, $text, $matches ) ) {
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$text = $matches[0];
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}
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return $text;
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}
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/**
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* Returns page HTML
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* @param WikiPage $page
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* @return string|null
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* @throws ApiUsageException
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* @throws UsageException
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*/
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private function parse( WikiPage $page ) {
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$apiException = null;
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if ( !$this->parserOptions ) {
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$this->parserOptions = new ParserOptions( new User( '127.0.0.1' ) );
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if ( is_callable( [ $this->parserOptions, 'setWrapOutputClass' ] ) &&
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!defined( 'ParserOutput::SUPPORTS_UNWRAP_TRANSFORM' )
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) {
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$this->parserOptions->setWrapOutputClass( false );
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}
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}
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// first try finding full page in parser cache
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if ( $page->shouldCheckParserCache( $this->parserOptions, 0 ) ) {
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$pout = MediaWikiServices::getInstance()->getParserCache()->get( $page, $this->parserOptions );
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if ( $pout ) {
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$text = $pout->getText( [ 'unwrap' => true ] );
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if ( $this->params['intro'] ) {
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$text = $this->getFirstSection( $text, false );
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}
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return $text;
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}
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}
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$request = [
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'action' => 'parse',
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'page' => $page->getTitle()->getPrefixedText(),
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'prop' => 'text',
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// Invokes special handling when using partial wikitext (T168743)
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'sectionpreview' => 1,
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'wrapoutputclass' => '',
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];
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if ( $this->params['intro'] ) {
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$request['section'] = 0;
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}
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// in case of cache miss, render just the needed section
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$api = new ApiMain( new FauxRequest( $request ) );
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try {
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$api->execute();
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$data = $api->getResult()->getResultData( null, [
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'BC' => [],
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'Types' => [],
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] );
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} catch ( ApiUsageException $e ) {
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$apiException = $e->__toString();
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if ( $e->getStatusValue()->hasMessage( 'apierror-nosuchsection' ) ) {
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// Looks like we tried to get the intro to a page without
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// sections! Lets just grab what we can get.
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unset( $request['section'] );
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$api = new ApiMain( new FauxRequest( $request ) );
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$api->execute();
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$data = $api->getResult()->getResultData( null, [
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'BC' => [],
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'Types' => [],
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] );
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} else {
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// Some other unexpected error - lets just report it to the user
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// on the off chance that is the right thing.
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throw $e;
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}
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} catch ( UsageException $e ) {
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$apiException = $e->__toString();
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if ( $e->getCodeString() === 'nosuchsection' ) {
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// Looks like we tried to get the intro to a page without
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// sections! Lets just grab what we can get.
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unset( $request['section'] );
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$api = new ApiMain( new FauxRequest( $request ) );
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$api->execute();
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$data = $api->getResult()->getResultData( null, [
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'BC' => [],
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'Types' => [],
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] );
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} else {
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// Some other unexpected error - lets just report it to the user
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// on the off chance that is the right thing.
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throw $e;
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}
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}
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if ( !array_key_exists( 'parse', $data ) ) {
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LoggerFactory::getInstance( 'textextracts' )->warning(
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'API Parse request failed while generating text extract', [
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'title' => $page->getTitle()->getFullText(),
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'url' => $this->getRequest()->getFullRequestURL(),
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'exception' => $apiException,
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'request' => $request
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] );
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return null;
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}
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return $data['parse']['text']['*'];
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}
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/**
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* @param \ApiQuery $query API query module
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* @param string $name Name of this query module
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* @return ApiQueryExtracts
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*/
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public static function factory( $query, $name ) {
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$config = MediaWikiServices::getInstance()->getConfigFactory()->makeConfig( 'textextracts' );
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return new self( $query, $name, $config );
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}
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/**
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* Converts page HTML into an extract
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* @param string $text
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* @return string
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*/
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private function convertText( $text ) {
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$fmt = new ExtractFormatter(
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$text,
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$this->params['plaintext'],
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$this->config
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);
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$text = $fmt->getText();
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return trim( $text );
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}
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/**
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* Truncate the given text to a certain number of characters or sentences
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* @param string $text The text to truncate
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* @return string
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*/
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private function truncate( $text ) {
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if ( $this->params['chars'] ) {
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return $this->getFirstChars( $text, $this->params['chars'] );
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} elseif ( $this->params['sentences'] ) {
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return $this->getFirstSentences( $text, $this->params['sentences'] );
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}
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return $text;
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}
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/**
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* Returns no more than a requested number of characters
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* @param string $text
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* @param int $requestedLength
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* @return string
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*/
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private function getFirstChars( $text, $requestedLength ) {
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$text = ExtractFormatter::getFirstChars( $text, $requestedLength );
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// Fix possibly unclosed tags
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$text = $this->tidy( $text );
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$text .= wfMessage( 'ellipsis' )->inContentLanguage()->text();
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return $text;
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}
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/**
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* @param string $text
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* @param int $requestedSentenceCount
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* @return string
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*/
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private function getFirstSentences( $text, $requestedSentenceCount ) {
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$text = ExtractFormatter::getFirstSentences( $text, $requestedSentenceCount );
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$text = $this->tidy( $text );
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return $text;
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}
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/**
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* A simple wrapper around tidy
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* @param string $text
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* @return string
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*/
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private function tidy( $text ) {
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$tidyConfig = $this->getConfig()->get( 'TidyConfig' );
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if ( $tidyConfig !== null && !$this->params['plaintext'] ) {
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$text = trim( MWTidy::tidy( $text ) );
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}
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return $text;
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}
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private function doSections( $text ) {
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$text = preg_replace_callback(
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"/" . ExtractFormatter::SECTION_MARKER_START . '(\d)' .
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ExtractFormatter::SECTION_MARKER_END . "(.*?)$/m",
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[ $this, 'sectionCallback' ],
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$text
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);
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return $text;
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}
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private function sectionCallback( $matches ) {
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if ( $this->params['sectionformat'] == 'raw' ) {
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return $matches[0];
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}
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$sectionformat = ucfirst( $this->params['sectionformat'] );
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$func = __CLASS__ . "::doSection{$sectionformat}";
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return call_user_func( $func, $matches[1], trim( $matches[2] ) );
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}
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private static function doSectionWiki( $level, $text ) {
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$bars = str_repeat( '=', $level );
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return "\n$bars $text $bars";
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}
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private static function doSectionPlain( $level, $text ) {
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return "\n$text";
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}
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/**
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* Return an array describing all possible parameters to this module
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* @return array
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*/
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public function getAllowedParams() {
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return [
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'chars' => [
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ApiBase::PARAM_TYPE => 'integer',
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ApiBase::PARAM_MIN => 1,
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ApiBase::PARAM_MAX => 1200,
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],
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'sentences' => [
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ApiBase::PARAM_TYPE => 'integer',
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ApiBase::PARAM_MIN => 1,
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ApiBase::PARAM_MAX => 10,
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],
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'limit' => [
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ApiBase::PARAM_DFLT => 20,
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ApiBase::PARAM_TYPE => 'limit',
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ApiBase::PARAM_MIN => 1,
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ApiBase::PARAM_MAX => 20,
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ApiBase::PARAM_MAX2 => 20,
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],
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'intro' => false,
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'plaintext' => false,
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'sectionformat' => [
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ApiBase::PARAM_TYPE => [ 'plain', 'wiki', 'raw' ],
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ApiBase::PARAM_DFLT => 'wiki',
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],
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'continue' => [
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ApiBase::PARAM_TYPE => 'integer',
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ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
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],
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];
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}
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/**
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* @see ApiBase::getExamplesMessages()
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* @return array
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*/
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protected function getExamplesMessages() {
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return [
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'action=query&prop=extracts&exchars=175&titles=Therion'
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=> 'apihelp-query+extracts-example-1',
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];
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}
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/**
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* @see ApiBase::getHelpUrls()
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* @return string
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*/
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public function getHelpUrls() {
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return 'https://www.mediawiki.org/wiki/Extension:TextExtracts#API';
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}
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}
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