includes/api/ApiPageSet.php

   1 <?php
   2 /**
   3  * Copyright © 2006, 2013 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22 use MediaWiki\MediaWikiServices;
  23 use Wikimedia\Rdbms\ResultWrapper;
  24 use Wikimedia\Rdbms\IDatabase;
  25
  26 /**
  27  * This class contains a list of pages that the client has requested.
  28  * Initially, when the client passes in titles=, pageids=, or revisions=
  29  * parameter, an instance of the ApiPageSet class will normalize titles,
  30  * determine if the pages/revisions exist, and prefetch any additional page
  31  * data requested.
  32  *
  33  * When a generator is used, the result of the generator will become the input
  34  * for the second instance of this class, and all subsequent actions will use
  35  * the second instance for all their work.
  36  *
  37  * @ingroup API
  38  * @since 1.21 derives from ApiBase instead of ApiQueryBase
  39  */
  40 class ApiPageSet extends ApiBase {
  41         /**
  42          * Constructor flag: The new instance of ApiPageSet will ignore the 'generator=' parameter
  43          * @since 1.21
  44          */
  45         const DISABLE_GENERATORS = 1;
  46
  47         private $mDbSource;
  48         private $mParams;
  49         private $mResolveRedirects;
  50         private $mConvertTitles;
  51         private $mAllowGenerator;
  52
  53         private $mAllPages = []; // [ns][dbkey] => page_id or negative when missing
  54         private $mTitles = [];
  55         private $mGoodAndMissingPages = []; // [ns][dbkey] => page_id or negative when missing
  56         private $mGoodPages = []; // [ns][dbkey] => page_id
  57         private $mGoodTitles = [];
  58         private $mMissingPages = []; // [ns][dbkey] => fake page_id
  59         private $mMissingTitles = [];
  60         /** @var array [fake_page_id] => [ 'title' => $title, 'invalidreason' => $reason ] */
  61         private $mInvalidTitles = [];
  62         private $mMissingPageIDs = [];
  63         private $mRedirectTitles = [];
  64         private $mSpecialTitles = [];
  65         private $mAllSpecials = []; // separate from mAllPages to avoid breaking getAllTitlesByNamespace()
  66         private $mNormalizedTitles = [];
  67         private $mInterwikiTitles = [];
  68         /** @var Title[] */
  69         private $mPendingRedirectIDs = [];
  70         private $mPendingRedirectSpecialPages = []; // [dbkey] => [ Title $from, Title $to ]
  71         private $mResolvedRedirectTitles = [];
  72         private $mConvertedTitles = [];
  73         private $mGoodRevIDs = [];
  74         private $mLiveRevIDs = [];
  75         private $mDeletedRevIDs = [];
  76         private $mMissingRevIDs = [];
  77         private $mGeneratorData = []; // [ns][dbkey] => data array
  78         private $mFakePageId = -1;
  79         private $mCacheMode = 'public';
  80         private $mRequestedPageFields = [];
  81         /** @var int */
  82         private $mDefaultNamespace = NS_MAIN;
  83         /** @var callable|null */
  84         private $mRedirectMergePolicy;
  85
  86         /**
  87          * Add all items from $values into the result
  88          * @param array $result Output
  89          * @param array $values Values to add
  90          * @param string[] $flags The names of boolean flags to mark this element
  91          * @param string $name If given, name of the value
  92          */
  93         private static function addValues( array &$result, $values, $flags = [], $name = null ) {
  94                 foreach ( $values as $val ) {
  95                         if ( $val instanceof Title ) {
  96                                 $v = [];
  97                                 ApiQueryBase::addTitleInfo( $v, $val );
  98                         } elseif ( $name !== null ) {
  99                                 $v = [ $name => $val ];
 100                         } else {
 101                                 $v = $val;
 102                         }
 103                         foreach ( $flags as $flag ) {
 104                                 $v[$flag] = true;
 105                         }
 106                         $result[] = $v;
 107                 }
 108         }
 109
 110         /**
 111          * @param ApiBase $dbSource Module implementing getDB().
 112          *        Allows PageSet to reuse existing db connection from the shared state like ApiQuery.
 113          * @param int $flags Zero or more flags like DISABLE_GENERATORS
 114          * @param int $defaultNamespace The namespace to use if none is specified by a prefix.
 115          * @since 1.21 accepts $flags instead of two boolean values
 116          */
 117         public function __construct( ApiBase $dbSource, $flags = 0, $defaultNamespace = NS_MAIN ) {
 118                 parent::__construct( $dbSource->getMain(), $dbSource->getModuleName() );
 119                 $this->mDbSource = $dbSource;
 120                 $this->mAllowGenerator = ( $flags & self::DISABLE_GENERATORS ) == 0;
 121                 $this->mDefaultNamespace = $defaultNamespace;
 122
 123                 $this->mParams = $this->extractRequestParams();
 124                 $this->mResolveRedirects = $this->mParams['redirects'];
 125                 $this->mConvertTitles = $this->mParams['converttitles'];
 126         }
 127
 128         /**
 129          * In case execute() is not called, call this method to mark all relevant parameters as used
 130          * This prevents unused parameters from being reported as warnings
 131          */
 132         public function executeDryRun() {
 133                 $this->executeInternal( true );
 134         }
 135
 136         /**
 137          * Populate the PageSet from the request parameters.
 138          */
 139         public function execute() {
 140                 $this->executeInternal( false );
 141         }
 142
 143         /**
 144          * Populate the PageSet from the request parameters.
 145          * @param bool $isDryRun If true, instantiates generator, but only to mark
 146          *    relevant parameters as used
 147          */
 148         private function executeInternal( $isDryRun ) {
 149                 $generatorName = $this->mAllowGenerator ? $this->mParams['generator'] : null;
 150                 if ( isset( $generatorName ) ) {
 151                         $dbSource = $this->mDbSource;
 152                         if ( !$dbSource instanceof ApiQuery ) {
 153                                 // If the parent container of this pageset is not ApiQuery, we must create it to run generator
 154                                 $dbSource = $this->getMain()->getModuleManager()->getModule( 'query' );
 155                         }
 156                         $generator = $dbSource->getModuleManager()->getModule( $generatorName, null, true );
 157                         if ( $generator === null ) {
 158                                 $this->dieWithError( [ 'apierror-badgenerator-unknown', $generatorName ], 'badgenerator' );
 159                         }
 160                         if ( !$generator instanceof ApiQueryGeneratorBase ) {
 161                                 $this->dieWithError( [ 'apierror-badgenerator-notgenerator', $generatorName ], 'badgenerator' );
 162                         }
 163                         // Create a temporary pageset to store generator's output,
 164                         // add any additional fields generator may need, and execute pageset to populate titles/pageids
 165                         $tmpPageSet = new ApiPageSet( $dbSource, self::DISABLE_GENERATORS );
 166                         $generator->setGeneratorMode( $tmpPageSet );
 167                         $this->mCacheMode = $generator->getCacheMode( $generator->extractRequestParams() );
 168
 169                         if ( !$isDryRun ) {
 170                                 $generator->requestExtraData( $tmpPageSet );
 171                         }
 172                         $tmpPageSet->executeInternal( $isDryRun );
 173
 174                         // populate this pageset with the generator output
 175                         if ( !$isDryRun ) {
 176                                 $generator->executeGenerator( $this );
 177
 178                                 // Avoid PHP 7.1 warning of passing $this by reference
 179                                 $apiModule = $this;
 180                                 Hooks::run( 'APIQueryGeneratorAfterExecute', [ &$generator, &$apiModule ] );
 181                         } else {
 182                                 // Prevent warnings from being reported on these parameters
 183                                 $main = $this->getMain();
 184                                 foreach ( $generator->extractRequestParams() as $paramName => $param ) {
 185                                         $main->markParamsUsed( $generator->encodeParamName( $paramName ) );
 186                                 }
 187                         }
 188
 189                         if ( !$isDryRun ) {
 190                                 $this->resolvePendingRedirects();
 191                         }
 192                 } else {
 193                         // Only one of the titles/pageids/revids is allowed at the same time
 194                         $dataSource = null;
 195                         if ( isset( $this->mParams['titles'] ) ) {
 196                                 $dataSource = 'titles';
 197                         }
 198                         if ( isset( $this->mParams['pageids'] ) ) {
 199                                 if ( isset( $dataSource ) ) {
 200                                         $this->dieWithError(
 201                                                 [
 202                                                         'apierror-invalidparammix-cannotusewith',
 203                                                         $this->encodeParamName( 'pageids' ),
 204                                                         $this->encodeParamName( $dataSource )
 205                                                 ],
 206                                                 'multisource'
 207                                         );
 208                                 }
 209                                 $dataSource = 'pageids';
 210                         }
 211                         if ( isset( $this->mParams['revids'] ) ) {
 212                                 if ( isset( $dataSource ) ) {
 213                                         $this->dieWithError(
 214                                                 [
 215                                                         'apierror-invalidparammix-cannotusewith',
 216                                                         $this->encodeParamName( 'revids' ),
 217                                                         $this->encodeParamName( $dataSource )
 218                                                 ],
 219                                                 'multisource'
 220                                         );
 221                                 }
 222                                 $dataSource = 'revids';
 223                         }
 224
 225                         if ( !$isDryRun ) {
 226                                 // Populate page information with the original user input
 227                                 switch ( $dataSource ) {
 228                                         case 'titles':
 229                                                 $this->initFromTitles( $this->mParams['titles'] );
 230                                                 break;
 231                                         case 'pageids':
 232                                                 $this->initFromPageIds( $this->mParams['pageids'] );
 233                                                 break;
 234                                         case 'revids':
 235                                                 if ( $this->mResolveRedirects ) {
 236                                                         $this->addWarning( 'apiwarn-redirectsandrevids' );
 237                                                 }
 238                                                 $this->mResolveRedirects = false;
 239                                                 $this->initFromRevIDs( $this->mParams['revids'] );
 240                                                 break;
 241                                         default:
 242                                                 // Do nothing - some queries do not need any of the data sources.
 243                                                 break;
 244                                 }
 245                         }
 246                 }
 247         }
 248
 249         /**
 250          * Check whether this PageSet is resolving redirects
 251          * @return bool
 252          */
 253         public function isResolvingRedirects() {
 254                 return $this->mResolveRedirects;
 255         }
 256
 257         /**
 258          * Return the parameter name that is the source of data for this PageSet
 259          *
 260          * If multiple source parameters are specified (e.g. titles and pageids),
 261          * one will be named arbitrarily.
 262          *
 263          * @return string|null
 264          */
 265         public function getDataSource() {
 266                 if ( $this->mAllowGenerator && isset( $this->mParams['generator'] ) ) {
 267                         return 'generator';
 268                 }
 269                 if ( isset( $this->mParams['titles'] ) ) {
 270                         return 'titles';
 271                 }
 272                 if ( isset( $this->mParams['pageids'] ) ) {
 273                         return 'pageids';
 274                 }
 275                 if ( isset( $this->mParams['revids'] ) ) {
 276                         return 'revids';
 277                 }
 278
 279                 return null;
 280         }
 281
 282         /**
 283          * Request an additional field from the page table.
 284          * Must be called before execute()
 285          * @param string $fieldName Field name
 286          */
 287         public function requestField( $fieldName ) {
 288                 $this->mRequestedPageFields[$fieldName] = null;
 289         }
 290
 291         /**
 292          * Get the value of a custom field previously requested through
 293          * requestField()
 294          * @param string $fieldName Field name
 295          * @return mixed Field value
 296          */
 297         public function getCustomField( $fieldName ) {
 298                 return $this->mRequestedPageFields[$fieldName];
 299         }
 300
 301         /**
 302          * Get the fields that have to be queried from the page table:
 303          * the ones requested through requestField() and a few basic ones
 304          * we always need
 305          * @return array Array of field names
 306          */
 307         public function getPageTableFields() {
 308                 // Ensure we get minimum required fields
 309                 // DON'T change this order
 310                 $pageFlds = [
 311                         'page_namespace' => null,
 312                         'page_title' => null,
 313                         'page_id' => null,
 314                 ];
 315
 316                 if ( $this->mResolveRedirects ) {
 317                         $pageFlds['page_is_redirect'] = null;
 318                 }
 319
 320                 if ( $this->getConfig()->get( 'ContentHandlerUseDB' ) ) {
 321                         $pageFlds['page_content_model'] = null;
 322                 }
 323
 324                 if ( $this->getConfig()->get( 'PageLanguageUseDB' ) ) {
 325                         $pageFlds['page_lang'] = null;
 326                 }
 327
 328                 foreach ( LinkCache::getSelectFields() as $field ) {
 329                         $pageFlds[$field] = null;
 330                 }
 331
 332                 $pageFlds = array_merge( $pageFlds, $this->mRequestedPageFields );
 333
 334                 return array_keys( $pageFlds );
 335         }
 336
 337         /**
 338          * Returns an array [ns][dbkey] => page_id for all requested titles.
 339          * page_id is a unique negative number in case title was not found.
 340          * Invalid titles will also have negative page IDs and will be in namespace 0
 341          * @return array
 342          */
 343         public function getAllTitlesByNamespace() {
 344                 return $this->mAllPages;
 345         }
 346
 347         /**
 348          * All Title objects provided.
 349          * @return Title[]
 350          */
 351         public function getTitles() {
 352                 return $this->mTitles;
 353         }
 354
 355         /**
 356          * Returns the number of unique pages (not revisions) in the set.
 357          * @return int
 358          */
 359         public function getTitleCount() {
 360                 return count( $this->mTitles );
 361         }
 362
 363         /**
 364          * Returns an array [ns][dbkey] => page_id for all good titles.
 365          * @return array
 366          */
 367         public function getGoodTitlesByNamespace() {
 368                 return $this->mGoodPages;
 369         }
 370
 371         /**
 372          * Title objects that were found in the database.
 373          * @return Title[] Array page_id (int) => Title (obj)
 374          */
 375         public function getGoodTitles() {
 376                 return $this->mGoodTitles;
 377         }
 378
 379         /**
 380          * Returns the number of found unique pages (not revisions) in the set.
 381          * @return int
 382          */
 383         public function getGoodTitleCount() {
 384                 return count( $this->mGoodTitles );
 385         }
 386
 387         /**
 388          * Returns an array [ns][dbkey] => fake_page_id for all missing titles.
 389          * fake_page_id is a unique negative number.
 390          * @return array
 391          */
 392         public function getMissingTitlesByNamespace() {
 393                 return $this->mMissingPages;
 394         }
 395
 396         /**
 397          * Title objects that were NOT found in the database.
 398          * The array's index will be negative for each item
 399          * @return Title[]
 400          */
 401         public function getMissingTitles() {
 402                 return $this->mMissingTitles;
 403         }
 404
 405         /**
 406          * Returns an array [ns][dbkey] => page_id for all good and missing titles.
 407          * @return array
 408          */
 409         public function getGoodAndMissingTitlesByNamespace() {
 410                 return $this->mGoodAndMissingPages;
 411         }
 412
 413         /**
 414          * Title objects for good and missing titles.
 415          * @return array
 416          */
 417         public function getGoodAndMissingTitles() {
 418                 return $this->mGoodTitles + $this->mMissingTitles;
 419         }
 420
 421         /**
 422          * Titles that were deemed invalid by Title::newFromText()
 423          * The array's index will be unique and negative for each item
 424          * @deprecated since 1.26, use self::getInvalidTitlesAndReasons()
 425          * @return string[] Array of strings (not Title objects)
 426          */
 427         public function getInvalidTitles() {
 428                 wfDeprecated( __METHOD__, '1.26' );
 429                 return array_map( function ( $t ) {
 430                         return $t['title'];
 431                 }, $this->mInvalidTitles );
 432         }
 433
 434         /**
 435          * Titles that were deemed invalid by Title::newFromText()
 436          * The array's index will be unique and negative for each item
 437          * @return array[] Array of arrays with 'title' and 'invalidreason' properties
 438          */
 439         public function getInvalidTitlesAndReasons() {
 440                 return $this->mInvalidTitles;
 441         }
 442
 443         /**
 444          * Page IDs that were not found in the database
 445          * @return array Array of page IDs
 446          */
 447         public function getMissingPageIDs() {
 448                 return $this->mMissingPageIDs;
 449         }
 450
 451         /**
 452          * Get a list of redirect resolutions - maps a title to its redirect
 453          * target, as an array of output-ready arrays
 454          * @return Title[]
 455          */
 456         public function getRedirectTitles() {
 457                 return $this->mRedirectTitles;
 458         }
 459
 460         /**
 461          * Get a list of redirect resolutions - maps a title to its redirect
 462          * target. Includes generator data for redirect source when available.
 463          * @param ApiResult|null $result
 464          * @return array Array of prefixed_title (string) => Title object
 465          * @since 1.21
 466          */
 467         public function getRedirectTitlesAsResult( $result = null ) {
 468                 $values = [];
 469                 foreach ( $this->getRedirectTitles() as $titleStrFrom => $titleTo ) {
 470                         $r = [
 471                                 'from' => strval( $titleStrFrom ),
 472                                 'to' => $titleTo->getPrefixedText(),
 473                         ];
 474                         if ( $titleTo->hasFragment() ) {
 475                                 $r['tofragment'] = $titleTo->getFragment();
 476                         }
 477                         if ( $titleTo->isExternal() ) {
 478                                 $r['tointerwiki'] = $titleTo->getInterwiki();
 479                         }
 480                         if ( isset( $this->mResolvedRedirectTitles[$titleStrFrom] ) ) {
 481                                 $titleFrom = $this->mResolvedRedirectTitles[$titleStrFrom];
 482                                 $ns = $titleFrom->getNamespace();
 483                                 $dbkey = $titleFrom->getDBkey();
 484                                 if ( isset( $this->mGeneratorData[$ns][$dbkey] ) ) {
 485                                         $r = array_merge( $this->mGeneratorData[$ns][$dbkey], $r );
 486                                 }
 487                         }
 488
 489                         $values[] = $r;
 490                 }
 491                 if ( !empty( $values ) && $result ) {
 492                         ApiResult::setIndexedTagName( $values, 'r' );
 493                 }
 494
 495                 return $values;
 496         }
 497
 498         /**
 499          * Get a list of title normalizations - maps a title to its normalized
 500          * version.
 501          * @return array Array of raw_prefixed_title (string) => prefixed_title (string)
 502          */
 503         public function getNormalizedTitles() {
 504                 return $this->mNormalizedTitles;
 505         }
 506
 507         /**
 508          * Get a list of title normalizations - maps a title to its normalized
 509          * version in the form of result array.
 510          * @param ApiResult|null $result
 511          * @return array Array of raw_prefixed_title (string) => prefixed_title (string)
 512          * @since 1.21
 513          */
 514         public function getNormalizedTitlesAsResult( $result = null ) {
 515                 global $wgContLang;
 516
 517                 $values = [];
 518                 foreach ( $this->getNormalizedTitles() as $rawTitleStr => $titleStr ) {
 519                         $encode = ( $wgContLang->normalize( $rawTitleStr ) !== $rawTitleStr );
 520                         $values[] = [
 521                                 'fromencoded' => $encode,
 522                                 'from' => $encode ? rawurlencode( $rawTitleStr ) : $rawTitleStr,
 523                                 'to' => $titleStr
 524                         ];
 525                 }
 526                 if ( !empty( $values ) && $result ) {
 527                         ApiResult::setIndexedTagName( $values, 'n' );
 528                 }
 529
 530                 return $values;
 531         }
 532
 533         /**
 534          * Get a list of title conversions - maps a title to its converted
 535          * version.
 536          * @return array Array of raw_prefixed_title (string) => prefixed_title (string)
 537          */
 538         public function getConvertedTitles() {
 539                 return $this->mConvertedTitles;
 540         }
 541
 542         /**
 543          * Get a list of title conversions - maps a title to its converted
 544          * version as a result array.
 545          * @param ApiResult|null $result
 546          * @return array Array of (from, to) strings
 547          * @since 1.21
 548          */
 549         public function getConvertedTitlesAsResult( $result = null ) {
 550                 $values = [];
 551                 foreach ( $this->getConvertedTitles() as $rawTitleStr => $titleStr ) {
 552                         $values[] = [
 553                                 'from' => $rawTitleStr,
 554                                 'to' => $titleStr
 555                         ];
 556                 }
 557                 if ( !empty( $values ) && $result ) {
 558                         ApiResult::setIndexedTagName( $values, 'c' );
 559                 }
 560
 561                 return $values;
 562         }
 563
 564         /**
 565          * Get a list of interwiki titles - maps a title to its interwiki
 566          * prefix.
 567          * @return array Array of raw_prefixed_title (string) => interwiki_prefix (string)
 568          */
 569         public function getInterwikiTitles() {
 570                 return $this->mInterwikiTitles;
 571         }
 572
 573         /**
 574          * Get a list of interwiki titles - maps a title to its interwiki
 575          * prefix as result.
 576          * @param ApiResult|null $result
 577          * @param bool $iwUrl
 578          * @return array Array of raw_prefixed_title (string) => interwiki_prefix (string)
 579          * @since 1.21
 580          */
 581         public function getInterwikiTitlesAsResult( $result = null, $iwUrl = false ) {
 582                 $values = [];
 583                 foreach ( $this->getInterwikiTitles() as $rawTitleStr => $interwikiStr ) {
 584                         $item = [
 585                                 'title' => $rawTitleStr,
 586                                 'iw' => $interwikiStr,
 587                         ];
 588                         if ( $iwUrl ) {
 589                                 $title = Title::newFromText( $rawTitleStr );
 590                                 $item['url'] = $title->getFullURL( '', false, PROTO_CURRENT );
 591                         }
 592                         $values[] = $item;
 593                 }
 594                 if ( !empty( $values ) && $result ) {
 595                         ApiResult::setIndexedTagName( $values, 'i' );
 596                 }
 597
 598                 return $values;
 599         }
 600
 601         /**
 602          * Get an array of invalid/special/missing titles.
 603          *
 604          * @param array $invalidChecks List of types of invalid titles to include.
 605          *   Recognized values are:
 606          *   - invalidTitles: Titles and reasons from $this->getInvalidTitlesAndReasons()
 607          *   - special: Titles from $this->getSpecialTitles()
 608          *   - missingIds: ids from $this->getMissingPageIDs()
 609          *   - missingRevIds: ids from $this->getMissingRevisionIDs()
 610          *   - missingTitles: Titles from $this->getMissingTitles()
 611          *   - interwikiTitles: Titles from $this->getInterwikiTitlesAsResult()
 612          * @return array Array suitable for inclusion in the response
 613          * @since 1.23
 614          */
 615         public function getInvalidTitlesAndRevisions( $invalidChecks = [ 'invalidTitles',
 616                 'special', 'missingIds', 'missingRevIds', 'missingTitles', 'interwikiTitles' ]
 617         ) {
 618                 $result = [];
 619                 if ( in_array( 'invalidTitles', $invalidChecks ) ) {
 620                         self::addValues( $result, $this->getInvalidTitlesAndReasons(), [ 'invalid' ] );
 621                 }
 622                 if ( in_array( 'special', $invalidChecks ) ) {
 623                         $known = [];
 624                         $unknown = [];
 625                         foreach ( $this->getSpecialTitles() as $title ) {
 626                                 if ( $title->isKnown() ) {
 627                                         $known[] = $title;
 628                                 } else {
 629                                         $unknown[] = $title;
 630                                 }
 631                         }
 632                         self::addValues( $result, $unknown, [ 'special', 'missing' ] );
 633                         self::addValues( $result, $known, [ 'special' ] );
 634                 }
 635                 if ( in_array( 'missingIds', $invalidChecks ) ) {
 636                         self::addValues( $result, $this->getMissingPageIDs(), [ 'missing' ], 'pageid' );
 637                 }
 638                 if ( in_array( 'missingRevIds', $invalidChecks ) ) {
 639                         self::addValues( $result, $this->getMissingRevisionIDs(), [ 'missing' ], 'revid' );
 640                 }
 641                 if ( in_array( 'missingTitles', $invalidChecks ) ) {
 642                         $known = [];
 643                         $unknown = [];
 644                         foreach ( $this->getMissingTitles() as $title ) {
 645                                 if ( $title->isKnown() ) {
 646                                         $known[] = $title;
 647                                 } else {
 648                                         $unknown[] = $title;
 649                                 }
 650                         }
 651                         self::addValues( $result, $unknown, [ 'missing' ] );
 652                         self::addValues( $result, $known, [ 'missing', 'known' ] );
 653                 }
 654                 if ( in_array( 'interwikiTitles', $invalidChecks ) ) {
 655                         self::addValues( $result, $this->getInterwikiTitlesAsResult() );
 656                 }
 657
 658                 return $result;
 659         }
 660
 661         /**
 662          * Get the list of valid revision IDs (requested with the revids= parameter)
 663          * @return array Array of revID (int) => pageID (int)
 664          */
 665         public function getRevisionIDs() {
 666                 return $this->mGoodRevIDs;
 667         }
 668
 669         /**
 670          * Get the list of non-deleted revision IDs (requested with the revids= parameter)
 671          * @return array Array of revID (int) => pageID (int)
 672          */
 673         public function getLiveRevisionIDs() {
 674                 return $this->mLiveRevIDs;
 675         }
 676
 677         /**
 678          * Get the list of revision IDs that were associated with deleted titles.
 679          * @return array Array of revID (int) => pageID (int)
 680          */
 681         public function getDeletedRevisionIDs() {
 682                 return $this->mDeletedRevIDs;
 683         }
 684
 685         /**
 686          * Revision IDs that were not found in the database
 687          * @return array Array of revision IDs
 688          */
 689         public function getMissingRevisionIDs() {
 690                 return $this->mMissingRevIDs;
 691         }
 692
 693         /**
 694          * Revision IDs that were not found in the database as result array.
 695          * @param ApiResult|null $result
 696          * @return array Array of revision IDs
 697          * @since 1.21
 698          */
 699         public function getMissingRevisionIDsAsResult( $result = null ) {
 700                 $values = [];
 701                 foreach ( $this->getMissingRevisionIDs() as $revid ) {
 702                         $values[$revid] = [
 703                                 'revid' => $revid
 704                         ];
 705                 }
 706                 if ( !empty( $values ) && $result ) {
 707                         ApiResult::setIndexedTagName( $values, 'rev' );
 708                 }
 709
 710                 return $values;
 711         }
 712
 713         /**
 714          * Get the list of titles with negative namespace
 715          * @return Title[]
 716          */
 717         public function getSpecialTitles() {
 718                 return $this->mSpecialTitles;
 719         }
 720
 721         /**
 722          * Returns the number of revisions (requested with revids= parameter).
 723          * @return int Number of revisions.
 724          */
 725         public function getRevisionCount() {
 726                 return count( $this->getRevisionIDs() );
 727         }
 728
 729         /**
 730          * Populate this PageSet from a list of Titles
 731          * @param array $titles Array of Title objects
 732          */
 733         public function populateFromTitles( $titles ) {
 734                 $this->initFromTitles( $titles );
 735         }
 736
 737         /**
 738          * Populate this PageSet from a list of page IDs
 739          * @param array $pageIDs Array of page IDs
 740          */
 741         public function populateFromPageIDs( $pageIDs ) {
 742                 $this->initFromPageIds( $pageIDs );
 743         }
 744
 745         /**
 746          * Populate this PageSet from a rowset returned from the database
 747          *
 748          * Note that the query result must include the columns returned by
 749          * $this->getPageTableFields().
 750          *
 751          * @param IDatabase $db
 752          * @param ResultWrapper $queryResult
 753          */
 754         public function populateFromQueryResult( $db, $queryResult ) {
 755                 $this->initFromQueryResult( $queryResult );
 756         }
 757
 758         /**
 759          * Populate this PageSet from a list of revision IDs
 760          * @param array $revIDs Array of revision IDs
 761          */
 762         public function populateFromRevisionIDs( $revIDs ) {
 763                 $this->initFromRevIDs( $revIDs );
 764         }
 765
 766         /**
 767          * Extract all requested fields from the row received from the database
 768          * @param stdClass $row Result row
 769          */
 770         public function processDbRow( $row ) {
 771                 // Store Title object in various data structures
 772                 $title = Title::newFromRow( $row );
 773
 774                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
 775                 $linkCache->addGoodLinkObjFromRow( $title, $row );
 776
 777                 $pageId = intval( $row->page_id );
 778                 $this->mAllPages[$row->page_namespace][$row->page_title] = $pageId;
 779                 $this->mTitles[] = $title;
 780
 781                 if ( $this->mResolveRedirects && $row->page_is_redirect == '1' ) {
 782                         $this->mPendingRedirectIDs[$pageId] = $title;
 783                 } else {
 784                         $this->mGoodPages[$row->page_namespace][$row->page_title] = $pageId;
 785                         $this->mGoodAndMissingPages[$row->page_namespace][$row->page_title] = $pageId;
 786                         $this->mGoodTitles[$pageId] = $title;
 787                 }
 788
 789                 foreach ( $this->mRequestedPageFields as $fieldName => &$fieldValues ) {
 790                         $fieldValues[$pageId] = $row->$fieldName;
 791                 }
 792         }
 793
 794         /**
 795          * This method populates internal variables with page information
 796          * based on the given array of title strings.
 797          *
 798          * Steps:
 799          * #1 For each title, get data from `page` table
 800          * #2 If page was not found in the DB, store it as missing
 801          *
 802          * Additionally, when resolving redirects:
 803          * #3 If no more redirects left, stop.
 804          * #4 For each redirect, get its target from the `redirect` table.
 805          * #5 Substitute the original LinkBatch object with the new list
 806          * #6 Repeat from step #1
 807          *
 808          * @param array $titles Array of Title objects or strings
 809          */
 810         private function initFromTitles( $titles ) {
 811                 // Get validated and normalized title objects
 812                 $linkBatch = $this->processTitlesArray( $titles );
 813                 if ( $linkBatch->isEmpty() ) {
 814                         // There might be special-page redirects
 815                         $this->resolvePendingRedirects();
 816                         return;
 817                 }
 818
 819                 $db = $this->getDB();
 820                 $set = $linkBatch->constructSet( 'page', $db );
 821
 822                 // Get pageIDs data from the `page` table
 823                 $res = $db->select( 'page', $this->getPageTableFields(), $set,
 824                         __METHOD__ );
 825
 826                 // Hack: get the ns:titles stored in [ ns => [ titles ] ] format
 827                 $this->initFromQueryResult( $res, $linkBatch->data, true ); // process Titles
 828
 829                 // Resolve any found redirects
 830                 $this->resolvePendingRedirects();
 831         }
 832
 833         /**
 834          * Does the same as initFromTitles(), but is based on page IDs instead
 835          * @param array $pageids Array of page IDs
 836          */
 837         private function initFromPageIds( $pageids ) {
 838                 if ( !$pageids ) {
 839                         return;
 840                 }
 841
 842                 $pageids = array_map( 'intval', $pageids ); // paranoia
 843                 $remaining = array_flip( $pageids );
 844
 845                 $pageids = self::getPositiveIntegers( $pageids );
 846
 847                 $res = null;
 848                 if ( !empty( $pageids ) ) {
 849                         $set = [
 850                                 'page_id' => $pageids
 851                         ];
 852                         $db = $this->getDB();
 853
 854                         // Get pageIDs data from the `page` table
 855                         $res = $db->select( 'page', $this->getPageTableFields(), $set,
 856                                 __METHOD__ );
 857                 }
 858
 859                 $this->initFromQueryResult( $res, $remaining, false ); // process PageIDs
 860
 861                 // Resolve any found redirects
 862                 $this->resolvePendingRedirects();
 863         }
 864
 865         /**
 866          * Iterate through the result of the query on 'page' table,
 867          * and for each row create and store title object and save any extra fields requested.
 868          * @param ResultWrapper $res DB Query result
 869          * @param array $remaining Array of either pageID or ns/title elements (optional).
 870          *        If given, any missing items will go to $mMissingPageIDs and $mMissingTitles
 871          * @param bool $processTitles Must be provided together with $remaining.
 872          *        If true, treat $remaining as an array of [ns][title]
 873          *        If false, treat it as an array of [pageIDs]
 874          */
 875         private function initFromQueryResult( $res, &$remaining = null, $processTitles = null ) {
 876                 if ( !is_null( $remaining ) && is_null( $processTitles ) ) {
 877                         ApiBase::dieDebug( __METHOD__, 'Missing $processTitles parameter when $remaining is provided' );
 878                 }
 879
 880                 $usernames = [];
 881                 if ( $res ) {
 882                         foreach ( $res as $row ) {
 883                                 $pageId = intval( $row->page_id );
 884
 885                                 // Remove found page from the list of remaining items
 886                                 if ( isset( $remaining ) ) {
 887                                         if ( $processTitles ) {
 888                                                 unset( $remaining[$row->page_namespace][$row->page_title] );
 889                                         } else {
 890                                                 unset( $remaining[$pageId] );
 891                                         }
 892                                 }
 893
 894                                 // Store any extra fields requested by modules
 895                                 $this->processDbRow( $row );
 896
 897                                 // Need gender information
 898                                 if ( MWNamespace::hasGenderDistinction( $row->page_namespace ) ) {
 899                                         $usernames[] = $row->page_title;
 900                                 }
 901                         }
 902                 }
 903
 904                 if ( isset( $remaining ) ) {
 905                         // Any items left in the $remaining list are added as missing
 906                         if ( $processTitles ) {
 907                                 // The remaining titles in $remaining are non-existent pages
 908                                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
 909                                 foreach ( $remaining as $ns => $dbkeys ) {
 910                                         foreach ( array_keys( $dbkeys ) as $dbkey ) {
 911                                                 $title = Title::makeTitle( $ns, $dbkey );
 912                                                 $linkCache->addBadLinkObj( $title );
 913                                                 $this->mAllPages[$ns][$dbkey] = $this->mFakePageId;
 914                                                 $this->mMissingPages[$ns][$dbkey] = $this->mFakePageId;
 915                                                 $this->mGoodAndMissingPages[$ns][$dbkey] = $this->mFakePageId;
 916                                                 $this->mMissingTitles[$this->mFakePageId] = $title;
 917                                                 $this->mFakePageId--;
 918                                                 $this->mTitles[] = $title;
 919
 920                                                 // need gender information
 921                                                 if ( MWNamespace::hasGenderDistinction( $ns ) ) {
 922                                                         $usernames[] = $dbkey;
 923                                                 }
 924                                         }
 925                                 }
 926                         } else {
 927                                 // The remaining pageids do not exist
 928                                 if ( !$this->mMissingPageIDs ) {
 929                                         $this->mMissingPageIDs = array_keys( $remaining );
 930                                 } else {
 931                                         $this->mMissingPageIDs = array_merge( $this->mMissingPageIDs, array_keys( $remaining ) );
 932                                 }
 933                         }
 934                 }
 935
 936                 // Get gender information
 937                 $genderCache = MediaWikiServices::getInstance()->getGenderCache();
 938                 $genderCache->doQuery( $usernames, __METHOD__ );
 939         }
 940
 941         /**
 942          * Does the same as initFromTitles(), but is based on revision IDs
 943          * instead
 944          * @param array $revids Array of revision IDs
 945          */
 946         private function initFromRevIDs( $revids ) {
 947                 if ( !$revids ) {
 948                         return;
 949                 }
 950
 951                 $revids = array_map( 'intval', $revids ); // paranoia
 952                 $db = $this->getDB();
 953                 $pageids = [];
 954                 $remaining = array_flip( $revids );
 955
 956                 $revids = self::getPositiveIntegers( $revids );
 957
 958                 if ( !empty( $revids ) ) {
 959                         $tables = [ 'revision', 'page' ];
 960                         $fields = [ 'rev_id', 'rev_page' ];
 961                         $where = [ 'rev_id' => $revids, 'rev_page = page_id' ];
 962
 963                         // Get pageIDs data from the `page` table
 964                         $res = $db->select( $tables, $fields, $where, __METHOD__ );
 965                         foreach ( $res as $row ) {
 966                                 $revid = intval( $row->rev_id );
 967                                 $pageid = intval( $row->rev_page );
 968                                 $this->mGoodRevIDs[$revid] = $pageid;
 969                                 $this->mLiveRevIDs[$revid] = $pageid;
 970                                 $pageids[$pageid] = '';
 971                                 unset( $remaining[$revid] );
 972                         }
 973                 }
 974
 975                 $this->mMissingRevIDs = array_keys( $remaining );
 976
 977                 // Populate all the page information
 978                 $this->initFromPageIds( array_keys( $pageids ) );
 979
 980                 // If the user can see deleted revisions, pull out the corresponding
 981                 // titles from the archive table and include them too. We ignore
 982                 // ar_page_id because deleted revisions are tied by title, not page_id.
 983                 if ( !empty( $this->mMissingRevIDs ) && $this->getUser()->isAllowed( 'deletedhistory' ) ) {
 984                         $remaining = array_flip( $this->mMissingRevIDs );
 985                         $tables = [ 'archive' ];
 986                         $fields = [ 'ar_rev_id', 'ar_namespace', 'ar_title' ];
 987                         $where = [ 'ar_rev_id' => $this->mMissingRevIDs ];
 988
 989                         $res = $db->select( $tables, $fields, $where, __METHOD__ );
 990                         $titles = [];
 991                         foreach ( $res as $row ) {
 992                                 $revid = intval( $row->ar_rev_id );
 993                                 $titles[$revid] = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 994                                 unset( $remaining[$revid] );
 995                         }
 996
 997                         $this->initFromTitles( $titles );
 998
 999                         foreach ( $titles as $revid => $title ) {
1000                                 $ns = $title->getNamespace();
1001                                 $dbkey = $title->getDBkey();
1002
1003                                 // Handle converted titles
1004                                 if ( !isset( $this->mAllPages[$ns][$dbkey] ) &&
1005                                         isset( $this->mConvertedTitles[$title->getPrefixedText()] )
1006                                 ) {
1007                                         $title = Title::newFromText( $this->mConvertedTitles[$title->getPrefixedText()] );
1008                                         $ns = $title->getNamespace();
1009                                         $dbkey = $title->getDBkey();
1010                                 }
1011
1012                                 if ( isset( $this->mAllPages[$ns][$dbkey] ) ) {
1013                                         $this->mGoodRevIDs[$revid] = $this->mAllPages[$ns][$dbkey];
1014                                         $this->mDeletedRevIDs[$revid] = $this->mAllPages[$ns][$dbkey];
1015                                 } else {
1016                                         $remaining[$revid] = true;
1017                                 }
1018                         }
1019
1020                         $this->mMissingRevIDs = array_keys( $remaining );
1021                 }
1022         }
1023
1024         /**
1025          * Resolve any redirects in the result if redirect resolution was
1026          * requested. This function is called repeatedly until all redirects
1027          * have been resolved.
1028          */
1029         private function resolvePendingRedirects() {
1030                 if ( $this->mResolveRedirects ) {
1031                         $db = $this->getDB();
1032                         $pageFlds = $this->getPageTableFields();
1033
1034                         // Repeat until all redirects have been resolved
1035                         // The infinite loop is prevented by keeping all known pages in $this->mAllPages
1036                         while ( $this->mPendingRedirectIDs || $this->mPendingRedirectSpecialPages ) {
1037                                 // Resolve redirects by querying the pagelinks table, and repeat the process
1038                                 // Create a new linkBatch object for the next pass
1039                                 $linkBatch = $this->getRedirectTargets();
1040
1041                                 if ( $linkBatch->isEmpty() ) {
1042                                         break;
1043                                 }
1044
1045                                 $set = $linkBatch->constructSet( 'page', $db );
1046                                 if ( $set === false ) {
1047                                         break;
1048                                 }
1049
1050                                 // Get pageIDs data from the `page` table
1051                                 $res = $db->select( 'page', $pageFlds, $set, __METHOD__ );
1052
1053                                 // Hack: get the ns:titles stored in [ns => array(titles)] format
1054                                 $this->initFromQueryResult( $res, $linkBatch->data, true );
1055                         }
1056                 }
1057         }
1058
1059         /**
1060          * Get the targets of the pending redirects from the database
1061          *
1062          * Also creates entries in the redirect table for redirects that don't
1063          * have one.
1064          * @return LinkBatch
1065          */
1066         private function getRedirectTargets() {
1067                 $titlesToResolve = [];
1068                 $db = $this->getDB();
1069
1070                 if ( $this->mPendingRedirectIDs ) {
1071                         $res = $db->select(
1072                                 'redirect',
1073                                 [
1074                                         'rd_from',
1075                                         'rd_namespace',
1076                                         'rd_fragment',
1077                                         'rd_interwiki',
1078                                         'rd_title'
1079                                 ], [ 'rd_from' => array_keys( $this->mPendingRedirectIDs ) ],
1080                                         __METHOD__
1081                                 );
1082                         foreach ( $res as $row ) {
1083                                 $rdfrom = intval( $row->rd_from );
1084                                 $from = $this->mPendingRedirectIDs[$rdfrom]->getPrefixedText();
1085                                 $to = Title::makeTitle(
1086                                         $row->rd_namespace,
1087                                         $row->rd_title,
1088                                         $row->rd_fragment,
1089                                         $row->rd_interwiki
1090                                 );
1091                                 $this->mResolvedRedirectTitles[$from] = $this->mPendingRedirectIDs[$rdfrom];
1092                                 unset( $this->mPendingRedirectIDs[$rdfrom] );
1093                                 if ( $to->isExternal() ) {
1094                                         $this->mInterwikiTitles[$to->getPrefixedText()] = $to->getInterwiki();
1095                                 } elseif ( !isset( $this->mAllPages[$to->getNamespace()][$to->getDBkey()] ) ) {
1096                                         $titlesToResolve[] = $to;
1097                                 }
1098                                 $this->mRedirectTitles[$from] = $to;
1099                         }
1100
1101                         if ( $this->mPendingRedirectIDs ) {
1102                                 // We found pages that aren't in the redirect table
1103                                 // Add them
1104                                 foreach ( $this->mPendingRedirectIDs as $id => $title ) {
1105                                         $page = WikiPage::factory( $title );
1106                                         $rt = $page->insertRedirect();
1107                                         if ( !$rt ) {
1108                                                 // What the hell. Let's just ignore this
1109                                                 continue;
1110                                         }
1111                                         if ( $rt->isExternal() ) {
1112                                                 $this->mInterwikiTitles[$rt->getPrefixedText()] = $rt->getInterwiki();
1113                                         } elseif ( !isset( $this->mAllPages[$rt->getNamespace()][$rt->getDBkey()] ) ) {
1114                                                 $titlesToResolve[] = $rt;
1115                                         }
1116                                         $from = $title->getPrefixedText();
1117                                         $this->mResolvedRedirectTitles[$from] = $title;
1118                                         $this->mRedirectTitles[$from] = $rt;
1119                                         unset( $this->mPendingRedirectIDs[$id] );
1120                                 }
1121                         }
1122                 }
1123
1124                 if ( $this->mPendingRedirectSpecialPages ) {
1125                         foreach ( $this->mPendingRedirectSpecialPages as $key => list( $from, $to ) ) {
1126                                 $fromKey = $from->getPrefixedText();
1127                                 $this->mResolvedRedirectTitles[$fromKey] = $from;
1128                                 $this->mRedirectTitles[$fromKey] = $to;
1129                                 if ( $to->isExternal() ) {
1130                                         $this->mInterwikiTitles[$to->getPrefixedText()] = $to->getInterwiki();
1131                                 } elseif ( !isset( $this->mAllPages[$to->getNamespace()][$to->getDBkey()] ) ) {
1132                                         $titlesToResolve[] = $to;
1133                                 }
1134                         }
1135                         $this->mPendingRedirectSpecialPages = [];
1136
1137                         // Set private caching since we don't know what criteria the
1138                         // special pages used to decide on these redirects.
1139                         $this->mCacheMode = 'private';
1140                 }
1141
1142                 return $this->processTitlesArray( $titlesToResolve );
1143         }
1144
1145         /**
1146          * Get the cache mode for the data generated by this module.
1147          * All PageSet users should take into account whether this returns a more-restrictive
1148          * cache mode than the using module itself. For possible return values and other
1149          * details about cache modes, see ApiMain::setCacheMode()
1150          *
1151          * Public caching will only be allowed if *all* the modules that supply
1152          * data for a given request return a cache mode of public.
1153          *
1154          * @param array|null $params
1155          * @return string
1156          * @since 1.21
1157          */
1158         public function getCacheMode( $params = null ) {
1159                 return $this->mCacheMode;
1160         }
1161
1162         /**
1163          * Given an array of title strings, convert them into Title objects.
1164          * Alternatively, an array of Title objects may be given.
1165          * This method validates access rights for the title,
1166          * and appends normalization values to the output.
1167          *
1168          * @param array $titles Array of Title objects or strings
1169          * @return LinkBatch
1170          */
1171         private function processTitlesArray( $titles ) {
1172                 $usernames = [];
1173                 $linkBatch = new LinkBatch();
1174
1175                 foreach ( $titles as $title ) {
1176                         if ( is_string( $title ) ) {
1177                                 try {
1178                                         $titleObj = Title::newFromTextThrow( $title, $this->mDefaultNamespace );
1179                                 } catch ( MalformedTitleException $ex ) {
1180                                         // Handle invalid titles gracefully
1181                                         if ( !isset( $this->mAllPages[0][$title] ) ) {
1182                                                 $this->mAllPages[0][$title] = $this->mFakePageId;
1183                                                 $this->mInvalidTitles[$this->mFakePageId] = [
1184                                                         'title' => $title,
1185                                                         'invalidreason' => $this->getErrorFormatter()->formatException( $ex, [ 'bc' => true ] ),
1186                                                 ];
1187                                                 $this->mFakePageId--;
1188                                         }
1189                                         continue; // There's nothing else we can do
1190                                 }
1191                         } else {
1192                                 $titleObj = $title;
1193                         }
1194                         $unconvertedTitle = $titleObj->getPrefixedText();
1195                         $titleWasConverted = false;
1196                         if ( $titleObj->isExternal() ) {
1197                                 // This title is an interwiki link.
1198                                 $this->mInterwikiTitles[$unconvertedTitle] = $titleObj->getInterwiki();
1199                         } else {
1200                                 // Variants checking
1201                                 global $wgContLang;
1202                                 if ( $this->mConvertTitles &&
1203                                         $wgContLang->hasVariants() &&
1204                                         !$titleObj->exists()
1205                                 ) {
1206                                         // Language::findVariantLink will modify titleText and titleObj into
1207                                         // the canonical variant if possible
1208                                         $titleText = is_string( $title ) ? $title : $titleObj->getPrefixedText();
1209                                         $wgContLang->findVariantLink( $titleText, $titleObj );
1210                                         $titleWasConverted = $unconvertedTitle !== $titleObj->getPrefixedText();
1211                                 }
1212
1213                                 if ( $titleObj->getNamespace() < 0 ) {
1214                                         // Handle Special and Media pages
1215                                         $titleObj = $titleObj->fixSpecialName();
1216                                         $ns = $titleObj->getNamespace();
1217                                         $dbkey = $titleObj->getDBkey();
1218                                         if ( !isset( $this->mAllSpecials[$ns][$dbkey] ) ) {
1219                                                 $this->mAllSpecials[$ns][$dbkey] = $this->mFakePageId;
1220                                                 $target = null;
1221                                                 if ( $ns === NS_SPECIAL && $this->mResolveRedirects ) {
1222                                                         $special = SpecialPageFactory::getPage( $dbkey );
1223                                                         if ( $special instanceof RedirectSpecialArticle ) {
1224                                                                 // Only RedirectSpecialArticle is intended to redirect to an article, other kinds of
1225                                                                 // RedirectSpecialPage are probably applying weird URL parameters we don't want to handle.
1226                                                                 $context = new DerivativeContext( $this );
1227                                                                 $context->setTitle( $titleObj );
1228                                                                 $context->setRequest( new FauxRequest );
1229                                                                 $special->setContext( $context );
1230                                                                 list( /* $alias */, $subpage ) = SpecialPageFactory::resolveAlias( $dbkey );
1231                                                                 $target = $special->getRedirect( $subpage );
1232                                                         }
1233                                                 }
1234                                                 if ( $target ) {
1235                                                         $this->mPendingRedirectSpecialPages[$dbkey] = [ $titleObj, $target ];
1236                                                 } else {
1237                                                         $this->mSpecialTitles[$this->mFakePageId] = $titleObj;
1238                                                         $this->mFakePageId--;
1239                                                 }
1240                                         }
1241                                 } else {
1242                                         // Regular page
1243                                         $linkBatch->addObj( $titleObj );
1244                                 }
1245                         }
1246
1247                         // Make sure we remember the original title that was
1248                         // given to us. This way the caller can correlate new
1249                         // titles with the originally requested when e.g. the
1250                         // namespace is localized or the capitalization is
1251                         // different
1252                         if ( $titleWasConverted ) {
1253                                 $this->mConvertedTitles[$unconvertedTitle] = $titleObj->getPrefixedText();
1254                                 // In this case the page can't be Special.
1255                                 if ( is_string( $title ) && $title !== $unconvertedTitle ) {
1256                                         $this->mNormalizedTitles[$title] = $unconvertedTitle;
1257                                 }
1258                         } elseif ( is_string( $title ) && $title !== $titleObj->getPrefixedText() ) {
1259                                 $this->mNormalizedTitles[$title] = $titleObj->getPrefixedText();
1260                         }
1261
1262                         // Need gender information
1263                         if ( MWNamespace::hasGenderDistinction( $titleObj->getNamespace() ) ) {
1264                                 $usernames[] = $titleObj->getText();
1265                         }
1266                 }
1267                 // Get gender information
1268                 $genderCache = MediaWikiServices::getInstance()->getGenderCache();
1269                 $genderCache->doQuery( $usernames, __METHOD__ );
1270
1271                 return $linkBatch;
1272         }
1273
1274         /**
1275          * Set data for a title.
1276          *
1277          * This data may be extracted into an ApiResult using
1278          * self::populateGeneratorData. This should generally be limited to
1279          * data that is likely to be particularly useful to end users rather than
1280          * just being a dump of everything returned in non-generator mode.
1281          *
1282          * Redirects here will *not* be followed, even if 'redirects' was
1283          * specified, since in the case of multiple redirects we can't know which
1284          * source's data to use on the target.
1285          *
1286          * @param Title $title
1287          * @param array $data
1288          */
1289         public function setGeneratorData( Title $title, array $data ) {
1290                 $ns = $title->getNamespace();
1291                 $dbkey = $title->getDBkey();
1292                 $this->mGeneratorData[$ns][$dbkey] = $data;
1293         }
1294
1295         /**
1296          * Controls how generator data about a redirect source is merged into
1297          * the generator data for the redirect target. When not set no data
1298          * is merged. Note that if multiple titles redirect to the same target
1299          * the order of operations is undefined.
1300          *
1301          * Example to include generated data from redirect in target, prefering
1302          * the data generated for the destination when there is a collision:
1303          * @code
1304          *   $pageSet->setRedirectMergePolicy( function( array $current, array $new ) {
1305          *       return $current + $new;
1306          *   } );
1307          * @endcode
1308          *
1309          * @param callable|null $callable Recieves two array arguments, first the
1310          *  generator data for the redirect target and second the generator data
1311          *  for the redirect source. Returns the resulting generator data to use
1312          *  for the redirect target.
1313          */
1314         public function setRedirectMergePolicy( $callable ) {
1315                 $this->mRedirectMergePolicy = $callable;
1316         }
1317
1318         /**
1319          * Populate the generator data for all titles in the result
1320          *
1321          * The page data may be inserted into an ApiResult object or into an
1322          * associative array. The $path parameter specifies the path within the
1323          * ApiResult or array to find the "pages" node.
1324          *
1325          * The "pages" node itself must be an associative array mapping the page ID
1326          * or fake page ID values returned by this pageset (see
1327          * self::getAllTitlesByNamespace() and self::getSpecialTitles()) to
1328          * associative arrays of page data. Each of those subarrays will have the
1329          * data from self::setGeneratorData() merged in.
1330          *
1331          * Data that was set by self::setGeneratorData() for pages not in the
1332          * "pages" node will be ignored.
1333          *
1334          * @param ApiResult|array &$result
1335          * @param array $path
1336          * @return bool Whether the data fit
1337          */
1338         public function populateGeneratorData( &$result, array $path = [] ) {
1339                 if ( $result instanceof ApiResult ) {
1340                         $data = $result->getResultData( $path );
1341                         if ( $data === null ) {
1342                                 return true;
1343                         }
1344                 } else {
1345                         $data = &$result;
1346                         foreach ( $path as $key ) {
1347                                 if ( !isset( $data[$key] ) ) {
1348                                         // Path isn't in $result, so nothing to add, so everything
1349                                         // "fits"
1350                                         return true;
1351                                 }
1352                                 $data = &$data[$key];
1353                         }
1354                 }
1355                 foreach ( $this->mGeneratorData as $ns => $dbkeys ) {
1356                         if ( $ns === NS_SPECIAL ) {
1357                                 $pages = [];
1358                                 foreach ( $this->mSpecialTitles as $id => $title ) {
1359                                         $pages[$title->getDBkey()] = $id;
1360                                 }
1361                         } else {
1362                                 if ( !isset( $this->mAllPages[$ns] ) ) {
1363                                         // No known titles in the whole namespace. Skip it.
1364                                         continue;
1365                                 }
1366                                 $pages = $this->mAllPages[$ns];
1367                         }
1368                         foreach ( $dbkeys as $dbkey => $genData ) {
1369                                 if ( !isset( $pages[$dbkey] ) ) {
1370                                         // Unknown title. Forget it.
1371                                         continue;
1372                                 }
1373                                 $pageId = $pages[$dbkey];
1374                                 if ( !isset( $data[$pageId] ) ) {
1375                                         // $pageId didn't make it into the result. Ignore it.
1376                                         continue;
1377                                 }
1378
1379                                 if ( $result instanceof ApiResult ) {
1380                                         $path2 = array_merge( $path, [ $pageId ] );
1381                                         foreach ( $genData as $key => $value ) {
1382                                                 if ( !$result->addValue( $path2, $key, $value ) ) {
1383                                                         return false;
1384                                                 }
1385                                         }
1386                                 } else {
1387                                         $data[$pageId] = array_merge( $data[$pageId], $genData );
1388                                 }
1389                         }
1390                 }
1391
1392                 // Merge data generated about redirect titles into the redirect destination
1393                 if ( $this->mRedirectMergePolicy ) {
1394                         foreach ( $this->mResolvedRedirectTitles as $titleFrom ) {
1395                                 $dest = $titleFrom;
1396                                 while ( isset( $this->mRedirectTitles[$dest->getPrefixedText()] ) ) {
1397                                         $dest = $this->mRedirectTitles[$dest->getPrefixedText()];
1398                                 }
1399                                 $fromNs = $titleFrom->getNamespace();
1400                                 $fromDBkey = $titleFrom->getDBkey();
1401                                 $toPageId = $dest->getArticleID();
1402                                 if ( isset( $data[$toPageId] ) &&
1403                                         isset( $this->mGeneratorData[$fromNs][$fromDBkey] )
1404                                 ) {
1405                                         // It is necesary to set both $data and add to $result, if an ApiResult,
1406                                         // to ensure multiple redirects to the same destination are all merged.
1407                                         $data[$toPageId] = call_user_func(
1408                                                 $this->mRedirectMergePolicy,
1409                                                 $data[$toPageId],
1410                                                 $this->mGeneratorData[$fromNs][$fromDBkey]
1411                                         );
1412                                         if ( $result instanceof ApiResult ) {
1413                                                 if ( !$result->addValue( $path, $toPageId, $data[$toPageId], ApiResult::OVERRIDE ) ) {
1414                                                         return false;
1415                                                 }
1416                                         }
1417                                 }
1418                         }
1419                 }
1420
1421                 return true;
1422         }
1423
1424         /**
1425          * Get the database connection (read-only)
1426          * @return IDatabase
1427          */
1428         protected function getDB() {
1429                 return $this->mDbSource->getDB();
1430         }
1431
1432         /**
1433          * Returns the input array of integers with all values < 0 removed
1434          *
1435          * @param array $array
1436          * @return array
1437          */
1438         private static function getPositiveIntegers( $array ) {
1439                 // T27734 API: possible issue with revids validation
1440                 // It seems with a load of revision rows, MySQL gets upset
1441                 // Remove any < 0 integers, as they can't be valid
1442                 foreach ( $array as $i => $int ) {
1443                         if ( $int < 0 ) {
1444                                 unset( $array[$i] );
1445                         }
1446                 }
1447
1448                 return $array;
1449         }
1450
1451         public function getAllowedParams( $flags = 0 ) {
1452                 $result = [
1453                         'titles' => [
1454                                 ApiBase::PARAM_ISMULTI => true,
1455                                 ApiBase::PARAM_HELP_MSG => 'api-pageset-param-titles',
1456                         ],
1457                         'pageids' => [
1458                                 ApiBase::PARAM_TYPE => 'integer',
1459                                 ApiBase::PARAM_ISMULTI => true,
1460                                 ApiBase::PARAM_HELP_MSG => 'api-pageset-param-pageids',
1461                         ],
1462                         'revids' => [
1463                                 ApiBase::PARAM_TYPE => 'integer',
1464                                 ApiBase::PARAM_ISMULTI => true,
1465                                 ApiBase::PARAM_HELP_MSG => 'api-pageset-param-revids',
1466                         ],
1467                         'generator' => [
1468                                 ApiBase::PARAM_TYPE => null,
1469                                 ApiBase::PARAM_HELP_MSG => 'api-pageset-param-generator',
1470                                 ApiBase::PARAM_SUBMODULE_PARAM_PREFIX => 'g',
1471                         ],
1472                         'redirects' => [
1473                                 ApiBase::PARAM_DFLT => false,
1474                                 ApiBase::PARAM_HELP_MSG => $this->mAllowGenerator
1475                                         ? 'api-pageset-param-redirects-generator'
1476                                         : 'api-pageset-param-redirects-nogenerator',
1477                         ],
1478                         'converttitles' => [
1479                                 ApiBase::PARAM_DFLT => false,
1480                                 ApiBase::PARAM_HELP_MSG => [
1481                                         'api-pageset-param-converttitles',
1482                                         [ Message::listParam( LanguageConverter::$languagesWithVariants, 'text' ) ],
1483                                 ],
1484                         ],
1485                 ];
1486
1487                 if ( !$this->mAllowGenerator ) {
1488                         unset( $result['generator'] );
1489                 } elseif ( $flags & ApiBase::GET_VALUES_FOR_HELP ) {
1490                         $result['generator'][ApiBase::PARAM_TYPE] = 'submodule';
1491                         $result['generator'][ApiBase::PARAM_SUBMODULE_MAP] = $this->getGenerators();
1492                 }
1493
1494                 return $result;
1495         }
1496
1497         protected function handleParamNormalization( $paramName, $value, $rawValue ) {
1498                 parent::handleParamNormalization( $paramName, $value, $rawValue );
1499
1500                 if ( $paramName === 'titles' ) {
1501                         // For the 'titles' parameter, we want to split it like ApiBase would
1502                         // and add any changed titles to $this->mNormalizedTitles
1503                         $value = $this->explodeMultiValue( $value, self::LIMIT_SML2 + 1 );
1504                         $l = count( $value );
1505                         $rawValue = $this->explodeMultiValue( $rawValue, $l );
1506                         for ( $i = 0; $i < $l; $i++ ) {
1507                                 if ( $value[$i] !== $rawValue[$i] ) {
1508                                         $this->mNormalizedTitles[$rawValue[$i]] = $value[$i];
1509                                 }
1510                         }
1511                 }
1512         }
1513
1514         private static $generators = null;
1515
1516         /**
1517          * Get an array of all available generators
1518          * @return array
1519          */
1520         private function getGenerators() {
1521                 if ( self::$generators === null ) {
1522                         $query = $this->mDbSource;
1523                         if ( !( $query instanceof ApiQuery ) ) {
1524                                 // If the parent container of this pageset is not ApiQuery,
1525                                 // we must create it to get module manager
1526                                 $query = $this->getMain()->getModuleManager()->getModule( 'query' );
1527                         }
1528                         $gens = [];
1529                         $prefix = $query->getModulePath() . '+';
1530                         $mgr = $query->getModuleManager();
1531                         foreach ( $mgr->getNamesWithClasses() as $name => $class ) {
1532                                 if ( is_subclass_of( $class, ApiQueryGeneratorBase::class ) ) {
1533                                         $gens[$name] = $prefix . $name;
1534                                 }
1535                         }
1536                         ksort( $gens );
1537                         self::$generators = $gens;
1538                 }
1539
1540                 return self::$generators;
1541         }
1542 }