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| 1 | <?php |
| 2 | /** |
| 3 | * API module to handle links table back-queries |
| 4 | * |
| 5 | * Copyright © 2014 Wikimedia Foundation and contributors |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 20 | * http://www.gnu.org/copyleft/gpl.html |
| 21 | * |
| 22 | * @file |
| 23 | * @since 1.24 |
| 24 | */ |
| 25 | |
| 26 | use MediaWiki\Linker\LinksMigration; |
| 27 | use MediaWiki\MainConfigNames; |
| 28 | use MediaWiki\Title\Title; |
| 29 | use Wikimedia\ParamValidator\ParamValidator; |
| 30 | use Wikimedia\ParamValidator\TypeDef\IntegerDef; |
| 31 | use Wikimedia\Rdbms\OrExpressionGroup; |
| 32 | |
| 33 | /** |
| 34 | * This implements prop=redirects, prop=linkshere, prop=catmembers, |
| 35 | * prop=transcludedin, and prop=fileusage |
| 36 | * |
| 37 | * @ingroup API |
| 38 | * @since 1.24 |
| 39 | */ |
| 40 | class ApiQueryBacklinksprop extends ApiQueryGeneratorBase { |
| 41 | |
| 42 | /** @var array Data for the various modules implemented by this class */ |
| 43 | private static $settings = [ |
| 44 | 'redirects' => [ |
| 45 | 'code' => 'rd', |
| 46 | 'prefix' => 'rd', |
| 47 | 'linktable' => 'redirect', |
| 48 | 'props' => [ |
| 49 | 'fragment', |
| 50 | ], |
| 51 | 'showredirects' => false, |
| 52 | 'show' => [ |
| 53 | 'fragment', |
| 54 | '!fragment', |
| 55 | ], |
| 56 | ], |
| 57 | 'linkshere' => [ |
| 58 | 'code' => 'lh', |
| 59 | 'prefix' => 'pl', |
| 60 | 'linktable' => 'pagelinks', |
| 61 | 'indexes' => [ 'pl_namespace', 'pl_backlinks_namespace' ], |
| 62 | 'from_namespace' => true, |
| 63 | 'showredirects' => true, |
| 64 | ], |
| 65 | 'transcludedin' => [ |
| 66 | 'code' => 'ti', |
| 67 | 'prefix' => 'tl', |
| 68 | 'linktable' => 'templatelinks', |
| 69 | 'from_namespace' => true, |
| 70 | 'showredirects' => true, |
| 71 | ], |
| 72 | 'fileusage' => [ |
| 73 | 'code' => 'fu', |
| 74 | 'prefix' => 'il', |
| 75 | 'linktable' => 'imagelinks', |
| 76 | 'indexes' => [ 'il_to', 'il_backlinks_namespace' ], |
| 77 | 'from_namespace' => true, |
| 78 | 'to_namespace' => NS_FILE, |
| 79 | 'exampletitle' => 'File:Example.jpg', |
| 80 | 'showredirects' => true, |
| 81 | ], |
| 82 | ]; |
| 83 | |
| 84 | private LinksMigration $linksMigration; |
| 85 | |
| 86 | /** |
| 87 | * @param ApiQuery $query |
| 88 | * @param string $moduleName |
| 89 | * @param LinksMigration $linksMigration |
| 90 | */ |
| 91 | public function __construct( |
| 92 | ApiQuery $query, |
| 93 | $moduleName, |
| 94 | LinksMigration $linksMigration |
| 95 | ) { |
| 96 | parent::__construct( $query, $moduleName, self::$settings[$moduleName]['code'] ); |
| 97 | $this->linksMigration = $linksMigration; |
| 98 | } |
| 99 | |
| 100 | public function execute() { |
| 101 | $this->run(); |
| 102 | } |
| 103 | |
| 104 | public function executeGenerator( $resultPageSet ) { |
| 105 | $this->run( $resultPageSet ); |
| 106 | } |
| 107 | |
| 108 | /** |
| 109 | * @param ApiPageSet|null $resultPageSet |
| 110 | */ |
| 111 | private function run( ApiPageSet $resultPageSet = null ) { |
| 112 | $settings = self::$settings[$this->getModuleName()]; |
| 113 | |
| 114 | $db = $this->getDB(); |
| 115 | $params = $this->extractRequestParams(); |
| 116 | $prop = array_fill_keys( $params['prop'], true ); |
| 117 | |
| 118 | $pageSet = $this->getPageSet(); |
| 119 | $titles = $pageSet->getGoodAndMissingPages(); |
| 120 | $map = $pageSet->getGoodAndMissingTitlesByNamespace(); |
| 121 | |
| 122 | // Add in special pages, they can theoretically have backlinks too. |
| 123 | // (although currently they only do for prop=redirects) |
| 124 | foreach ( $pageSet->getSpecialPages() as $id => $title ) { |
| 125 | $titles[] = $title; |
| 126 | $map[$title->getNamespace()][$title->getDBkey()] = $id; |
| 127 | } |
| 128 | |
| 129 | // Determine our fields to query on |
| 130 | $p = $settings['prefix']; |
| 131 | $hasNS = !isset( $settings['to_namespace'] ); |
| 132 | if ( $hasNS ) { |
| 133 | if ( isset( $this->linksMigration::$mapping[$settings['linktable']] ) ) { |
| 134 | [ $bl_namespace, $bl_title ] = $this->linksMigration->getTitleFields( $settings['linktable'] ); |
| 135 | } else { |
| 136 | $bl_namespace = "{$p}_namespace"; |
| 137 | $bl_title = "{$p}_title"; |
| 138 | } |
| 139 | } else { |
| 140 | // @phan-suppress-next-line PhanTypePossiblyInvalidDimOffset False positive |
| 141 | $bl_namespace = $settings['to_namespace']; |
| 142 | $bl_title = "{$p}_to"; |
| 143 | |
| 144 | $titles = array_filter( $titles, static function ( $t ) use ( $bl_namespace ) { |
| 145 | return $t->getNamespace() === $bl_namespace; |
| 146 | } ); |
| 147 | $map = array_intersect_key( $map, [ $bl_namespace => true ] ); |
| 148 | } |
| 149 | $bl_from = "{$p}_from"; |
| 150 | |
| 151 | if ( !$titles ) { |
| 152 | return; // nothing to do |
| 153 | } |
| 154 | if ( $params['namespace'] !== null && count( $params['namespace'] ) === 0 ) { |
| 155 | return; // nothing to do |
| 156 | } |
| 157 | |
| 158 | // Figure out what we're sorting by, and add associated WHERE clauses. |
| 159 | // MySQL's query planner screws up if we include a field in ORDER BY |
| 160 | // when it's constant in WHERE, so we have to test that for each field. |
| 161 | $sortby = []; |
| 162 | if ( $hasNS && count( $map ) > 1 ) { |
| 163 | $sortby[$bl_namespace] = 'int'; |
| 164 | } |
| 165 | $theTitle = null; |
| 166 | foreach ( $map as $nsTitles ) { |
| 167 | $key = array_key_first( $nsTitles ); |
| 168 | $theTitle ??= $key; |
| 169 | if ( count( $nsTitles ) > 1 || $key !== $theTitle ) { |
| 170 | $sortby[$bl_title] = 'string'; |
| 171 | break; |
| 172 | } |
| 173 | } |
| 174 | $miser_ns = null; |
| 175 | if ( $params['namespace'] !== null ) { |
| 176 | if ( empty( $settings['from_namespace'] ) ) { |
| 177 | if ( $this->getConfig()->get( MainConfigNames::MiserMode ) ) { |
| 178 | $miser_ns = $params['namespace']; |
| 179 | } else { |
| 180 | $this->addWhereFld( 'page_namespace', $params['namespace'] ); |
| 181 | } |
| 182 | } else { |
| 183 | $this->addWhereFld( "{$p}_from_namespace", $params['namespace'] ); |
| 184 | if ( !empty( $settings['from_namespace'] ) |
| 185 | && $params['namespace'] !== null && count( $params['namespace'] ) > 1 |
| 186 | ) { |
| 187 | $sortby["{$p}_from_namespace"] = 'int'; |
| 188 | } |
| 189 | } |
| 190 | } |
| 191 | $sortby[$bl_from] = 'int'; |
| 192 | |
| 193 | // Now use the $sortby to figure out the continuation |
| 194 | $continueFields = array_keys( $sortby ); |
| 195 | $continueTypes = array_values( $sortby ); |
| 196 | if ( $params['continue'] !== null ) { |
| 197 | $continueValues = $this->parseContinueParamOrDie( $params['continue'], $continueTypes ); |
| 198 | $conds = array_combine( $continueFields, $continueValues ); |
| 199 | $this->addWhere( $db->buildComparison( '>=', $conds ) ); |
| 200 | } |
| 201 | |
| 202 | // Populate the rest of the query |
| 203 | [ $idxNoFromNS, $idxWithFromNS ] = $settings['indexes'] ?? [ '', '' ]; |
| 204 | // @phan-suppress-next-line PhanTypePossiblyInvalidDimOffset False positive |
| 205 | if ( isset( $this->linksMigration::$mapping[$settings['linktable']] ) ) { |
| 206 | // @phan-suppress-next-line PhanTypePossiblyInvalidDimOffset False positive |
| 207 | $queryInfo = $this->linksMigration->getQueryInfo( $settings['linktable'] ); |
| 208 | $this->addTables( array_merge( [ 'page' ], $queryInfo['tables'] ) ); |
| 209 | $this->addJoinConds( $queryInfo['joins'] ); |
| 210 | // TODO: Move to links migration |
| 211 | if ( in_array( 'linktarget', $queryInfo['tables'] ) ) { |
| 212 | $idxWithFromNS .= '_target_id'; |
| 213 | } |
| 214 | } else { |
| 215 | // @phan-suppress-next-line PhanTypePossiblyInvalidDimOffset False positive |
| 216 | $this->addTables( [ $settings['linktable'], 'page' ] ); |
| 217 | } |
| 218 | $this->addWhere( "$bl_from = page_id" ); |
| 219 | |
| 220 | if ( $this->getModuleName() === 'redirects' ) { |
| 221 | $this->addWhereFld( 'rd_interwiki', '' ); |
| 222 | } |
| 223 | |
| 224 | $this->addFields( array_keys( $sortby ) ); |
| 225 | $this->addFields( [ 'bl_namespace' => $bl_namespace, 'bl_title' => $bl_title ] ); |
| 226 | if ( $resultPageSet === null ) { |
| 227 | $fld_pageid = isset( $prop['pageid'] ); |
| 228 | $fld_title = isset( $prop['title'] ); |
| 229 | $fld_redirect = isset( $prop['redirect'] ); |
| 230 | |
| 231 | $this->addFieldsIf( 'page_id', $fld_pageid ); |
| 232 | $this->addFieldsIf( [ 'page_title', 'page_namespace' ], $fld_title ); |
| 233 | $this->addFieldsIf( 'page_is_redirect', $fld_redirect ); |
| 234 | |
| 235 | // prop=redirects |
| 236 | $fld_fragment = isset( $prop['fragment'] ); |
| 237 | $this->addFieldsIf( 'rd_fragment', $fld_fragment ); |
| 238 | } else { |
| 239 | $this->addFields( $resultPageSet->getPageTableFields() ); |
| 240 | } |
| 241 | |
| 242 | $this->addFieldsIf( 'page_namespace', $miser_ns !== null ); |
| 243 | |
| 244 | if ( $hasNS && $map ) { |
| 245 | // Can't use LinkBatch because it throws away Special titles. |
| 246 | // And we already have the needed data structure anyway. |
| 247 | $this->addWhere( $db->makeWhereFrom2d( $map, $bl_namespace, $bl_title ) ); |
| 248 | } else { |
| 249 | $where = []; |
| 250 | foreach ( $titles as $t ) { |
| 251 | if ( $t->getNamespace() == $bl_namespace ) { |
| 252 | $where[] = $db->expr( $bl_title, '=', $t->getDBkey() ); |
| 253 | } |
| 254 | } |
| 255 | $this->addWhere( new OrExpressionGroup( ...$where ) ); |
| 256 | } |
| 257 | |
| 258 | if ( $params['show'] !== null ) { |
| 259 | // prop=redirects only |
| 260 | $show = array_fill_keys( $params['show'], true ); |
| 261 | if ( ( isset( $show['fragment'] ) && isset( $show['!fragment'] ) ) || |
| 262 | ( isset( $show['redirect'] ) && isset( $show['!redirect'] ) ) |
| 263 | ) { |
| 264 | $this->dieWithError( 'apierror-show' ); |
| 265 | } |
| 266 | $this->addWhereIf( $db->expr( 'rd_fragment', '!=', '' ), isset( $show['fragment'] ) ); |
| 267 | $this->addWhereIf( [ 'rd_fragment' => '' ], isset( $show['!fragment'] ) ); |
| 268 | $this->addWhereIf( [ 'page_is_redirect' => 1 ], isset( $show['redirect'] ) ); |
| 269 | $this->addWhereIf( [ 'page_is_redirect' => 0 ], isset( $show['!redirect'] ) ); |
| 270 | } |
| 271 | |
| 272 | // Override any ORDER BY from above with what we calculated earlier. |
| 273 | $this->addOption( 'ORDER BY', array_keys( $sortby ) ); |
| 274 | |
| 275 | // MySQL's optimizer chokes if we have too many values in "$bl_title IN |
| 276 | // (...)" and chooses the wrong index, so specify the correct index to |
| 277 | // use for the query. See T139056 for details. |
| 278 | if ( !empty( $settings['indexes'] ) ) { |
| 279 | if ( |
| 280 | $params['namespace'] !== null && |
| 281 | count( $params['namespace'] ) == 1 && |
| 282 | !empty( $settings['from_namespace'] ) |
| 283 | ) { |
| 284 | // @phan-suppress-next-line PhanTypePossiblyInvalidDimOffset False positive |
| 285 | $this->addOption( 'USE INDEX', [ $settings['linktable'] => $idxWithFromNS ] ); |
| 286 | // @phan-suppress-next-line PhanTypePossiblyInvalidDimOffset False positive |
| 287 | } elseif ( !isset( $this->linksMigration::$mapping[$settings['linktable']] ) ) { |
| 288 | // @phan-suppress-next-line PhanTypePossiblyInvalidDimOffset False positive |
| 289 | $this->addOption( 'USE INDEX', [ $settings['linktable'] => $idxNoFromNS ] ); |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | $this->addOption( 'LIMIT', $params['limit'] + 1 ); |
| 294 | |
| 295 | $res = $this->select( __METHOD__ ); |
| 296 | |
| 297 | if ( $resultPageSet === null ) { |
| 298 | // @phan-suppress-next-line PhanPossiblyUndeclaredVariable set when used |
| 299 | if ( $fld_title ) { |
| 300 | $this->executeGenderCacheFromResultWrapper( $res, __METHOD__ ); |
| 301 | } |
| 302 | |
| 303 | $count = 0; |
| 304 | foreach ( $res as $row ) { |
| 305 | if ( ++$count > $params['limit'] ) { |
| 306 | // We've reached the one extra which shows that |
| 307 | // there are additional pages to be had. Stop here... |
| 308 | $this->setContinue( $row, $sortby ); |
| 309 | break; |
| 310 | } |
| 311 | |
| 312 | if ( $miser_ns !== null && !in_array( $row->page_namespace, $miser_ns ) ) { |
| 313 | // Miser mode namespace check |
| 314 | continue; |
| 315 | } |
| 316 | |
| 317 | // Get the ID of the current page |
| 318 | $id = $map[$row->bl_namespace][$row->bl_title]; |
| 319 | |
| 320 | $vals = []; |
| 321 | // @phan-suppress-next-line PhanPossiblyUndeclaredVariable set when used |
| 322 | if ( $fld_pageid ) { |
| 323 | $vals['pageid'] = (int)$row->page_id; |
| 324 | } |
| 325 | if ( $fld_title ) { |
| 326 | ApiQueryBase::addTitleInfo( $vals, |
| 327 | Title::makeTitle( $row->page_namespace, $row->page_title ) |
| 328 | ); |
| 329 | } |
| 330 | // @phan-suppress-next-line PhanPossiblyUndeclaredVariable set when used |
| 331 | if ( $fld_fragment && $row->rd_fragment !== '' ) { |
| 332 | $vals['fragment'] = $row->rd_fragment; |
| 333 | } |
| 334 | // @phan-suppress-next-line PhanPossiblyUndeclaredVariable set when used |
| 335 | if ( $fld_redirect ) { |
| 336 | $vals['redirect'] = (bool)$row->page_is_redirect; |
| 337 | } |
| 338 | $fit = $this->addPageSubItem( $id, $vals ); |
| 339 | if ( !$fit ) { |
| 340 | $this->setContinue( $row, $sortby ); |
| 341 | break; |
| 342 | } |
| 343 | } |
| 344 | } else { |
| 345 | $titles = []; |
| 346 | $count = 0; |
| 347 | foreach ( $res as $row ) { |
| 348 | if ( ++$count > $params['limit'] ) { |
| 349 | // We've reached the one extra which shows that |
| 350 | // there are additional pages to be had. Stop here... |
| 351 | $this->setContinue( $row, $sortby ); |
| 352 | break; |
| 353 | } |
| 354 | |
| 355 | if ( $miser_ns !== null && !in_array( $row->page_namespace, $miser_ns ) ) { |
| 356 | // Miser mode namespace check |
| 357 | continue; |
| 358 | } |
| 359 | |
| 360 | $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title ); |
| 361 | } |
| 362 | $resultPageSet->populateFromTitles( $titles ); |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | private function setContinue( $row, $sortby ) { |
| 367 | $cont = []; |
| 368 | foreach ( $sortby as $field => $v ) { |
| 369 | $cont[] = $row->$field; |
| 370 | } |
| 371 | $this->setContinueEnumParameter( 'continue', implode( '|', $cont ) ); |
| 372 | } |
| 373 | |
| 374 | public function getCacheMode( $params ) { |
| 375 | return 'public'; |
| 376 | } |
| 377 | |
| 378 | public function getAllowedParams() { |
| 379 | $settings = self::$settings[$this->getModuleName()]; |
| 380 | |
| 381 | $ret = [ |
| 382 | 'prop' => [ |
| 383 | ParamValidator::PARAM_TYPE => [ |
| 384 | 'pageid', |
| 385 | 'title', |
| 386 | ], |
| 387 | ParamValidator::PARAM_ISMULTI => true, |
| 388 | ParamValidator::PARAM_DEFAULT => 'pageid|title', |
| 389 | ApiBase::PARAM_HELP_MSG_PER_VALUE => [], |
| 390 | ], |
| 391 | 'namespace' => [ |
| 392 | ParamValidator::PARAM_ISMULTI => true, |
| 393 | ParamValidator::PARAM_TYPE => 'namespace', |
| 394 | ], |
| 395 | 'show' => null, // Will be filled/removed below |
| 396 | 'limit' => [ |
| 397 | ParamValidator::PARAM_DEFAULT => 10, |
| 398 | ParamValidator::PARAM_TYPE => 'limit', |
| 399 | IntegerDef::PARAM_MIN => 1, |
| 400 | IntegerDef::PARAM_MAX => ApiBase::LIMIT_BIG1, |
| 401 | IntegerDef::PARAM_MAX2 => ApiBase::LIMIT_BIG2 |
| 402 | ], |
| 403 | 'continue' => [ |
| 404 | ApiBase::PARAM_HELP_MSG => 'api-help-param-continue', |
| 405 | ], |
| 406 | ]; |
| 407 | |
| 408 | if ( empty( $settings['from_namespace'] ) && |
| 409 | $this->getConfig()->get( MainConfigNames::MiserMode ) ) { |
| 410 | $ret['namespace'][ApiBase::PARAM_HELP_MSG_APPEND] = [ |
| 411 | 'api-help-param-limited-in-miser-mode', |
| 412 | ]; |
| 413 | } |
| 414 | |
| 415 | if ( !empty( $settings['showredirects'] ) ) { |
| 416 | $ret['prop'][ParamValidator::PARAM_TYPE][] = 'redirect'; |
| 417 | $ret['prop'][ParamValidator::PARAM_DEFAULT] .= '|redirect'; |
| 418 | } |
| 419 | if ( isset( $settings['props'] ) ) { |
| 420 | $ret['prop'][ParamValidator::PARAM_TYPE] = array_merge( |
| 421 | $ret['prop'][ParamValidator::PARAM_TYPE], $settings['props'] |
| 422 | ); |
| 423 | } |
| 424 | |
| 425 | $show = []; |
| 426 | if ( !empty( $settings['showredirects'] ) ) { |
| 427 | $show[] = 'redirect'; |
| 428 | $show[] = '!redirect'; |
| 429 | } |
| 430 | if ( isset( $settings['show'] ) ) { |
| 431 | $show = array_merge( $show, $settings['show'] ); |
| 432 | } |
| 433 | if ( $show ) { |
| 434 | $ret['show'] = [ |
| 435 | ParamValidator::PARAM_TYPE => $show, |
| 436 | ParamValidator::PARAM_ISMULTI => true, |
| 437 | ApiBase::PARAM_HELP_MSG_PER_VALUE => [], |
| 438 | ]; |
| 439 | } else { |
| 440 | unset( $ret['show'] ); |
| 441 | } |
| 442 | |
| 443 | return $ret; |
| 444 | } |
| 445 | |
| 446 | protected function getExamplesMessages() { |
| 447 | $settings = self::$settings[$this->getModuleName()]; |
| 448 | $name = $this->getModuleName(); |
| 449 | $path = $this->getModulePath(); |
| 450 | $title = $settings['exampletitle'] ?? Title::newMainPage()->getPrefixedText(); |
| 451 | $etitle = rawurlencode( $title ); |
| 452 | |
| 453 | return [ |
| 454 | "action=query&prop={$name}&titles={$etitle}" |
| 455 | => "apihelp-$path-example-simple", |
| 456 | "action=query&generator={$name}&titles={$etitle}&prop=info" |
| 457 | => "apihelp-$path-example-generator", |
| 458 | ]; |
| 459 | } |
| 460 | |
| 461 | public function getHelpUrls() { |
| 462 | $name = ucfirst( $this->getModuleName() ); |
| 463 | return "https://www.mediawiki.org/wiki/Special:MyLanguage/API:{$name}"; |
| 464 | } |
| 465 | } |