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| 1 | <?php |
| 2 | |
| 3 | namespace TextExtracts; |
| 4 | |
| 5 | use ApiBase; |
| 6 | use ApiMain; |
| 7 | use ApiQueryBase; |
| 8 | use ApiUsageException; |
| 9 | use MediaWiki\Config\Config; |
| 10 | use MediaWiki\Config\ConfigFactory; |
| 11 | use MediaWiki\Languages\LanguageConverterFactory; |
| 12 | use MediaWiki\Logger\LoggerFactory; |
| 13 | use MediaWiki\MediaWikiServices; |
| 14 | use MediaWiki\Page\WikiPageFactory; |
| 15 | use MediaWiki\Request\FauxRequest; |
| 16 | use MediaWiki\Title\Title; |
| 17 | use ParserOptions; |
| 18 | use WANObjectCache; |
| 19 | use Wikimedia\ParamValidator\ParamValidator; |
| 20 | use WikiPage; |
| 21 | |
| 22 | /** |
| 23 | * @license GPL-2.0-or-later |
| 24 | */ |
| 25 | class ApiQueryExtracts extends ApiQueryBase { |
| 26 | |
| 27 | /** |
| 28 | * Bump when memcache needs clearing |
| 29 | */ |
| 30 | private const CACHE_VERSION = 2; |
| 31 | |
| 32 | private const PREFIX = 'ex'; |
| 33 | |
| 34 | /** |
| 35 | * @var array |
| 36 | */ |
| 37 | private $params; |
| 38 | |
| 39 | /** |
| 40 | * @var Config |
| 41 | */ |
| 42 | private $config; |
| 43 | /** |
| 44 | * @var WANObjectCache |
| 45 | */ |
| 46 | private $cache; |
| 47 | /** |
| 48 | * @var LanguageConverterFactory |
| 49 | */ |
| 50 | private $langConvFactory; |
| 51 | /** |
| 52 | * @var WikiPageFactory |
| 53 | */ |
| 54 | private $wikiPageFactory; |
| 55 | |
| 56 | // TODO: Allow extensions to hook into this to opt-in. |
| 57 | // This is partly for security reasons; see T107170. |
| 58 | /** |
| 59 | * @var string[] |
| 60 | */ |
| 61 | private $supportedContentModels = [ 'wikitext' ]; |
| 62 | |
| 63 | /** |
| 64 | * @param \ApiQuery $query API query module object |
| 65 | * @param string $moduleName Name of this query module |
| 66 | * @param ConfigFactory $configFactory |
| 67 | * @param WANObjectCache $cache |
| 68 | * @param LanguageConverterFactory $langConvFactory |
| 69 | * @param WikiPageFactory $wikiPageFactory |
| 70 | */ |
| 71 | public function __construct( |
| 72 | $query, |
| 73 | $moduleName, |
| 74 | ConfigFactory $configFactory, |
| 75 | WANObjectCache $cache, |
| 76 | LanguageConverterFactory $langConvFactory, |
| 77 | WikiPageFactory $wikiPageFactory |
| 78 | ) { |
| 79 | parent::__construct( $query, $moduleName, self::PREFIX ); |
| 80 | $this->config = $configFactory->makeConfig( 'textextracts' ); |
| 81 | $this->cache = $cache; |
| 82 | $this->langConvFactory = $langConvFactory; |
| 83 | $this->wikiPageFactory = $wikiPageFactory; |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Evaluates the parameters, performs the requested extraction of text, |
| 88 | * and sets up the result |
| 89 | */ |
| 90 | public function execute() { |
| 91 | $titles = $this->getPageSet()->getGoodTitles(); |
| 92 | if ( $titles === [] ) { |
| 93 | return; |
| 94 | } |
| 95 | $isXml = $this->getMain()->isInternalMode() |
| 96 | || $this->getMain()->getPrinter()->getFormat() == 'XML'; |
| 97 | $result = $this->getResult(); |
| 98 | $params = $this->params = $this->extractRequestParams(); |
| 99 | $this->requireMaxOneParameter( $params, 'chars', 'sentences' ); |
| 100 | $continue = 0; |
| 101 | $limit = intval( $params['limit'] ); |
| 102 | if ( $limit > 1 && !$params['intro'] && count( $titles ) > 1 ) { |
| 103 | $limit = 1; |
| 104 | $this->addWarning( [ 'apiwarn-textextracts-limit', $limit ] ); |
| 105 | } |
| 106 | if ( isset( $params['continue'] ) ) { |
| 107 | $continue = intval( $params['continue'] ); |
| 108 | $this->dieContinueUsageIf( $continue < 0 || $continue > count( $titles ) ); |
| 109 | $titles = array_slice( $titles, $continue, null, true ); |
| 110 | } |
| 111 | $count = 0; |
| 112 | $titleInFileNamespace = false; |
| 113 | /** @var Title $t */ |
| 114 | foreach ( $titles as $id => $t ) { |
| 115 | if ( ++$count > $limit ) { |
| 116 | $this->setContinueEnumParameter( 'continue', $continue + $count - 1 ); |
| 117 | break; |
| 118 | } |
| 119 | |
| 120 | if ( $t->inNamespace( NS_FILE ) ) { |
| 121 | $text = ''; |
| 122 | $titleInFileNamespace = true; |
| 123 | } else { |
| 124 | $params = $this->params; |
| 125 | $text = $this->getExtract( $t ); |
| 126 | $text = $this->truncate( $text ); |
| 127 | if ( $params['plaintext'] ) { |
| 128 | $text = $this->doSections( $text ); |
| 129 | } else { |
| 130 | if ( $params['sentences'] ) { |
| 131 | $this->addWarning( $this->msg( 'apiwarn-textextracts-sentences-and-html', self::PREFIX ) ); |
| 132 | } |
| 133 | $this->addWarning( 'apiwarn-textextracts-malformed-html' ); |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | if ( $isXml ) { |
| 138 | $fit = $result->addValue( [ 'query', 'pages', $id ], 'extract', [ '*' => $text ] ); |
| 139 | } else { |
| 140 | $fit = $result->addValue( [ 'query', 'pages', $id ], 'extract', $text ); |
| 141 | } |
| 142 | if ( !$fit ) { |
| 143 | $this->setContinueEnumParameter( 'continue', $continue + $count - 1 ); |
| 144 | break; |
| 145 | } |
| 146 | } |
| 147 | if ( $titleInFileNamespace ) { |
| 148 | $this->addWarning( 'apiwarn-textextracts-title-in-file-namespace' ); |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * @param array $params Ignored parameters |
| 154 | * @return string |
| 155 | */ |
| 156 | public function getCacheMode( $params ) { |
| 157 | return 'public'; |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * Returns a processed, but not trimmed extract |
| 162 | * @param Title $title |
| 163 | * @return string |
| 164 | */ |
| 165 | private function getExtract( Title $title ) { |
| 166 | $contentModel = $title->getContentModel(); |
| 167 | if ( !in_array( $contentModel, $this->supportedContentModels, true ) ) { |
| 168 | $this->addWarning( [ |
| 169 | 'apiwarn-textextracts-unsupportedmodel', |
| 170 | wfEscapeWikiText( $title->getPrefixedText() ), |
| 171 | $contentModel |
| 172 | ] ); |
| 173 | return ''; |
| 174 | } |
| 175 | |
| 176 | $page = $this->wikiPageFactory->newFromTitle( $title ); |
| 177 | |
| 178 | $introOnly = $this->params['intro']; |
| 179 | $text = $this->getFromCache( $page, $introOnly ); |
| 180 | // if we need just first section, try retrieving full page and getting first section out of it |
| 181 | if ( $text === false && $introOnly ) { |
| 182 | $text = $this->getFromCache( $page, false ); |
| 183 | if ( $text !== false ) { |
| 184 | $text = $this->getFirstSection( $text, $this->params['plaintext'] ); |
| 185 | } |
| 186 | } |
| 187 | if ( $text === false ) { |
| 188 | $text = $this->parse( $page ); |
| 189 | $text = $this->convertText( $text ); |
| 190 | $this->setCache( $page, $text ); |
| 191 | } |
| 192 | return $text; |
| 193 | } |
| 194 | |
| 195 | /** |
| 196 | * @param WANObjectCache $cache |
| 197 | * @param WikiPage $page |
| 198 | * @param bool $introOnly |
| 199 | * @return string |
| 200 | */ |
| 201 | private function cacheKey( WANObjectCache $cache, WikiPage $page, $introOnly ) { |
| 202 | $langConv = $this->langConvFactory->getLanguageConverter( $page->getTitle()->getPageLanguage() ); |
| 203 | return $cache->makeKey( 'textextracts', self::CACHE_VERSION, |
| 204 | $page->getId(), $page->getTouched(), |
| 205 | $langConv->getPreferredVariant(), |
| 206 | $this->params['plaintext'] ? 'plaintext' : 'html', |
| 207 | $introOnly ? 'intro' : 'full' |
| 208 | ); |
| 209 | } |
| 210 | |
| 211 | /** |
| 212 | * @param WikiPage $page |
| 213 | * @param bool $introOnly |
| 214 | * @return string|false |
| 215 | */ |
| 216 | private function getFromCache( WikiPage $page, $introOnly ) { |
| 217 | $cache = $this->cache; |
| 218 | // @TODO: replace with getWithSetCallback() |
| 219 | $key = $this->cacheKey( $cache, $page, $introOnly ); |
| 220 | return $cache->get( $key ); |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * @param WikiPage $page |
| 225 | * @param string $text |
| 226 | */ |
| 227 | private function setCache( WikiPage $page, $text ) { |
| 228 | $cache = $this->cache; |
| 229 | // @TODO: replace with getWithSetCallback() |
| 230 | $key = $this->cacheKey( $cache, $page, $this->params['intro'] ); |
| 231 | $cache->set( $key, $text, $this->getConfig()->get( 'ParserCacheExpireTime' ) ); |
| 232 | } |
| 233 | |
| 234 | /** |
| 235 | * @param string $text |
| 236 | * @param bool $plainText |
| 237 | * @return string |
| 238 | */ |
| 239 | private function getFirstSection( $text, $plainText ) { |
| 240 | if ( $plainText ) { |
| 241 | $regexp = '/^.*?(?=' . ExtractFormatter::SECTION_MARKER_START . |
| 242 | '(?!.' . ExtractFormatter::SECTION_MARKER_END . '<h2 id="mw-toc-heading"))/s'; |
| 243 | } else { |
| 244 | $regexp = '/^.*?(?=<h[1-6]\b(?! id="mw-toc-heading"))/s'; |
| 245 | } |
| 246 | if ( preg_match( $regexp, $text, $matches ) ) { |
| 247 | $text = $matches[0]; |
| 248 | } |
| 249 | return $text; |
| 250 | } |
| 251 | |
| 252 | /** |
| 253 | * Returns page HTML |
| 254 | * @param WikiPage $page |
| 255 | * @return string|null |
| 256 | * @throws ApiUsageException |
| 257 | */ |
| 258 | private function parse( WikiPage $page ) { |
| 259 | $apiException = null; |
| 260 | $parserOptions = ParserOptions::newFromAnon(); |
| 261 | |
| 262 | // first try finding full page in parser cache |
| 263 | if ( $page->shouldCheckParserCache( $parserOptions, 0 ) ) { |
| 264 | // TODO inject ParserCache |
| 265 | $pout = MediaWikiServices::getInstance()->getParserCache()->get( $page, $parserOptions ); |
| 266 | if ( $pout ) { |
| 267 | $text = $pout->getText( [ 'unwrap' => true ] ); |
| 268 | if ( $this->params['intro'] ) { |
| 269 | $text = $this->getFirstSection( $text, false ); |
| 270 | } |
| 271 | return $text; |
| 272 | } |
| 273 | } |
| 274 | $request = [ |
| 275 | 'action' => 'parse', |
| 276 | 'page' => $page->getTitle()->getPrefixedText(), |
| 277 | 'prop' => 'text', |
| 278 | // Invokes special handling when using partial wikitext (T168743) |
| 279 | 'sectionpreview' => 1, |
| 280 | 'wrapoutputclass' => '', |
| 281 | ]; |
| 282 | if ( $this->params['intro'] ) { |
| 283 | $request['section'] = 0; |
| 284 | } |
| 285 | // in case of cache miss, render just the needed section |
| 286 | $api = new ApiMain( new FauxRequest( $request ) ); |
| 287 | try { |
| 288 | $api->execute(); |
| 289 | $data = $api->getResult()->getResultData( null, [ |
| 290 | 'BC' => [], |
| 291 | 'Types' => [], |
| 292 | ] ); |
| 293 | } catch ( ApiUsageException $e ) { |
| 294 | $apiException = $e->__toString(); |
| 295 | if ( $e->getStatusValue()->hasMessage( 'apierror-nosuchsection' ) ) { |
| 296 | // Looks like we tried to get the intro to a page without |
| 297 | // sections! Lets just grab what we can get. |
| 298 | unset( $request['section'] ); |
| 299 | $api = new ApiMain( new FauxRequest( $request ) ); |
| 300 | $api->execute(); |
| 301 | $data = $api->getResult()->getResultData( null, [ |
| 302 | 'BC' => [], |
| 303 | 'Types' => [], |
| 304 | ] ); |
| 305 | } else { |
| 306 | // Some other unexpected error - lets just report it to the user |
| 307 | // on the off chance that is the right thing. |
| 308 | throw $e; |
| 309 | } |
| 310 | } |
| 311 | if ( !array_key_exists( 'parse', $data ) ) { |
| 312 | LoggerFactory::getInstance( 'textextracts' )->warning( |
| 313 | 'API Parse request failed while generating text extract', [ |
| 314 | 'title' => $page->getTitle()->getFullText(), |
| 315 | 'url' => $this->getRequest()->getFullRequestURL(), |
| 316 | 'exception' => $apiException, |
| 317 | 'request' => $request |
| 318 | ] ); |
| 319 | return null; |
| 320 | } |
| 321 | |
| 322 | return $data['parse']['text']['*']; |
| 323 | } |
| 324 | |
| 325 | /** |
| 326 | * Converts page HTML into an extract |
| 327 | * @param string $text |
| 328 | * @return string |
| 329 | */ |
| 330 | private function convertText( $text ) { |
| 331 | $fmt = new ExtractFormatter( $text, $this->params['plaintext'] ); |
| 332 | $fmt->remove( $this->config->get( 'ExtractsRemoveClasses' ) ); |
| 333 | $text = $fmt->getText(); |
| 334 | return $text; |
| 335 | } |
| 336 | |
| 337 | /** |
| 338 | * Truncate the given text to a certain number of characters or sentences |
| 339 | * @param string $text The text to truncate |
| 340 | * @return string |
| 341 | */ |
| 342 | private function truncate( $text ) { |
| 343 | $useTidy = !$this->params['plaintext']; |
| 344 | $truncator = new TextTruncator( $useTidy ); |
| 345 | |
| 346 | if ( $this->params['chars'] ) { |
| 347 | $truncatedText = $truncator->getFirstChars( $text, $this->params['chars'] ); |
| 348 | if ( $truncatedText !== $text ) { |
| 349 | $text = $truncatedText . $this->msg( 'ellipsis' )->text(); |
| 350 | } |
| 351 | } elseif ( $this->params['sentences'] ) { |
| 352 | $text = $truncator->getFirstSentences( $text, $this->params['sentences'] ); |
| 353 | } |
| 354 | return $text; |
| 355 | } |
| 356 | |
| 357 | /** |
| 358 | * @param string $text |
| 359 | * @return string |
| 360 | */ |
| 361 | private function doSections( $text ) { |
| 362 | $pattern = '/' . |
| 363 | ExtractFormatter::SECTION_MARKER_START . '(\d)' . |
| 364 | ExtractFormatter::SECTION_MARKER_END . '(.*)/'; |
| 365 | |
| 366 | switch ( $this->params['sectionformat'] ) { |
| 367 | case 'raw': |
| 368 | return $text; |
| 369 | |
| 370 | case 'wiki': |
| 371 | return preg_replace_callback( $pattern, static function ( $matches ) { |
| 372 | $bars = str_repeat( '=', $matches[1] ); |
| 373 | return "\n$bars " . trim( $matches[2] ) . " $bars"; |
| 374 | }, $text ); |
| 375 | |
| 376 | case 'plain': |
| 377 | return preg_replace_callback( $pattern, static function ( $matches ) { |
| 378 | return "\n" . trim( $matches[2] ); |
| 379 | }, $text ); |
| 380 | |
| 381 | default: |
| 382 | throw new \LogicException( 'Invalid sectionformat' ); |
| 383 | } |
| 384 | } |
| 385 | |
| 386 | /** |
| 387 | * @inheritDoc |
| 388 | */ |
| 389 | public function getAllowedParams() { |
| 390 | return [ |
| 391 | 'chars' => [ |
| 392 | ApiBase::PARAM_TYPE => 'integer', |
| 393 | ApiBase::PARAM_MIN => 1, |
| 394 | ApiBase::PARAM_MAX => 1200, |
| 395 | ], |
| 396 | 'sentences' => [ |
| 397 | ApiBase::PARAM_TYPE => 'integer', |
| 398 | ApiBase::PARAM_MIN => 1, |
| 399 | ApiBase::PARAM_MAX => 10, |
| 400 | ], |
| 401 | 'limit' => [ |
| 402 | ParamValidator::PARAM_DEFAULT => 20, |
| 403 | ApiBase::PARAM_TYPE => 'limit', |
| 404 | ApiBase::PARAM_MIN => 1, |
| 405 | ApiBase::PARAM_MAX => 20, |
| 406 | ApiBase::PARAM_MAX2 => 20, |
| 407 | ], |
| 408 | 'intro' => false, |
| 409 | 'plaintext' => false, |
| 410 | 'sectionformat' => [ |
| 411 | ApiBase::PARAM_TYPE => [ 'plain', 'wiki', 'raw' ], |
| 412 | ParamValidator::PARAM_DEFAULT => 'wiki', |
| 413 | ApiBase::PARAM_HELP_MSG_PER_VALUE => [], |
| 414 | ], |
| 415 | 'continue' => [ |
| 416 | ApiBase::PARAM_TYPE => 'integer', |
| 417 | ApiBase::PARAM_HELP_MSG => 'api-help-param-continue', |
| 418 | ], |
| 419 | ]; |
| 420 | } |
| 421 | |
| 422 | /** |
| 423 | * @inheritDoc |
| 424 | */ |
| 425 | protected function getExamplesMessages() { |
| 426 | return [ |
| 427 | 'action=query&prop=extracts&exchars=175&titles=Therion' |
| 428 | => 'apihelp-query+extracts-example-1', |
| 429 | ]; |
| 430 | } |
| 431 | |
| 432 | /** |
| 433 | * @inheritDoc |
| 434 | */ |
| 435 | public function getHelpUrls() { |
| 436 | return 'https://www.mediawiki.org/wiki/Special:MyLanguage/Extension:TextExtracts#API'; |
| 437 | } |
| 438 | |
| 439 | } |