includes/api/ApiQuery.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on Sep 7, 2006
   6  *
   7  * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  */
  26
  27 /**
  28  * This is the main query class. It behaves similar to ApiMain: based on the
  29  * parameters given, it will create a list of titles to work on (an ApiPageSet
  30  * object), instantiate and execute various property/list/meta modules, and
  31  * assemble all resulting data into a single ApiResult object.
  32  *
  33  * In generator mode, a generator will be executed first to populate a second
  34  * ApiPageSet object, and that object will be used for all subsequent modules.
  35  *
  36  * @ingroup API
  37  */
  38 class ApiQuery extends ApiBase {
  39
  40         /**
  41          * List of Api Query prop modules
  42          * @var array
  43          */
  44         private static $QueryPropModules = [
  45                 'categories' => 'ApiQueryCategories',
  46                 'categoryinfo' => 'ApiQueryCategoryInfo',
  47                 'contributors' => 'ApiQueryContributors',
  48                 'deletedrevisions' => 'ApiQueryDeletedRevisions',
  49                 'duplicatefiles' => 'ApiQueryDuplicateFiles',
  50                 'extlinks' => 'ApiQueryExternalLinks',
  51                 'fileusage' => 'ApiQueryBacklinksprop',
  52                 'images' => 'ApiQueryImages',
  53                 'imageinfo' => 'ApiQueryImageInfo',
  54                 'info' => 'ApiQueryInfo',
  55                 'links' => 'ApiQueryLinks',
  56                 'linkshere' => 'ApiQueryBacklinksprop',
  57                 'iwlinks' => 'ApiQueryIWLinks',
  58                 'langlinks' => 'ApiQueryLangLinks',
  59                 'pageprops' => 'ApiQueryPageProps',
  60                 'redirects' => 'ApiQueryBacklinksprop',
  61                 'revisions' => 'ApiQueryRevisions',
  62                 'stashimageinfo' => 'ApiQueryStashImageInfo',
  63                 'templates' => 'ApiQueryLinks',
  64                 'transcludedin' => 'ApiQueryBacklinksprop',
  65         ];
  66
  67         /**
  68          * List of Api Query list modules
  69          * @var array
  70          */
  71         private static $QueryListModules = [
  72                 'allcategories' => 'ApiQueryAllCategories',
  73                 'alldeletedrevisions' => 'ApiQueryAllDeletedRevisions',
  74                 'allfileusages' => 'ApiQueryAllLinks',
  75                 'allimages' => 'ApiQueryAllImages',
  76                 'alllinks' => 'ApiQueryAllLinks',
  77                 'allpages' => 'ApiQueryAllPages',
  78                 'allredirects' => 'ApiQueryAllLinks',
  79                 'allrevisions' => 'ApiQueryAllRevisions',
  80                 'mystashedfiles' => 'ApiQueryMyStashedFiles',
  81                 'alltransclusions' => 'ApiQueryAllLinks',
  82                 'allusers' => 'ApiQueryAllUsers',
  83                 'backlinks' => 'ApiQueryBacklinks',
  84                 'blocks' => 'ApiQueryBlocks',
  85                 'categorymembers' => 'ApiQueryCategoryMembers',
  86                 'deletedrevs' => 'ApiQueryDeletedrevs',
  87                 'embeddedin' => 'ApiQueryBacklinks',
  88                 'exturlusage' => 'ApiQueryExtLinksUsage',
  89                 'filearchive' => 'ApiQueryFilearchive',
  90                 'imageusage' => 'ApiQueryBacklinks',
  91                 'iwbacklinks' => 'ApiQueryIWBacklinks',
  92                 'langbacklinks' => 'ApiQueryLangBacklinks',
  93                 'logevents' => 'ApiQueryLogEvents',
  94                 'pageswithprop' => 'ApiQueryPagesWithProp',
  95                 'pagepropnames' => 'ApiQueryPagePropNames',
  96                 'prefixsearch' => 'ApiQueryPrefixSearch',
  97                 'protectedtitles' => 'ApiQueryProtectedTitles',
  98                 'querypage' => 'ApiQueryQueryPage',
  99                 'random' => 'ApiQueryRandom',
 100                 'recentchanges' => 'ApiQueryRecentChanges',
 101                 'search' => 'ApiQuerySearch',
 102                 'tags' => 'ApiQueryTags',
 103                 'usercontribs' => 'ApiQueryContributions',
 104                 'users' => 'ApiQueryUsers',
 105                 'watchlist' => 'ApiQueryWatchlist',
 106                 'watchlistraw' => 'ApiQueryWatchlistRaw',
 107         ];
 108
 109         /**
 110          * List of Api Query meta modules
 111          * @var array
 112          */
 113         private static $QueryMetaModules = [
 114                 'allmessages' => 'ApiQueryAllMessages',
 115                 'authmanagerinfo' => 'ApiQueryAuthManagerInfo',
 116                 'siteinfo' => 'ApiQuerySiteinfo',
 117                 'userinfo' => 'ApiQueryUserInfo',
 118                 'filerepoinfo' => 'ApiQueryFileRepoInfo',
 119                 'tokens' => 'ApiQueryTokens',
 120         ];
 121
 122         /**
 123          * @var ApiPageSet
 124          */
 125         private $mPageSet;
 126
 127         private $mParams;
 128         private $mNamedDB = [];
 129         private $mModuleMgr;
 130
 131         /**
 132          * @param ApiMain $main
 133          * @param string $action
 134          */
 135         public function __construct( ApiMain $main, $action ) {
 136                 parent::__construct( $main, $action );
 137
 138                 $this->mModuleMgr = new ApiModuleManager( $this );
 139
 140                 // Allow custom modules to be added in LocalSettings.php
 141                 $config = $this->getConfig();
 142                 $this->mModuleMgr->addModules( self::$QueryPropModules, 'prop' );
 143                 $this->mModuleMgr->addModules( $config->get( 'APIPropModules' ), 'prop' );
 144                 $this->mModuleMgr->addModules( self::$QueryListModules, 'list' );
 145                 $this->mModuleMgr->addModules( $config->get( 'APIListModules' ), 'list' );
 146                 $this->mModuleMgr->addModules( self::$QueryMetaModules, 'meta' );
 147                 $this->mModuleMgr->addModules( $config->get( 'APIMetaModules' ), 'meta' );
 148
 149                 Hooks::run( 'ApiQuery::moduleManager', [ $this->mModuleMgr ] );
 150
 151                 // Create PageSet that will process titles/pageids/revids/generator
 152                 $this->mPageSet = new ApiPageSet( $this );
 153         }
 154
 155         /**
 156          * Overrides to return this instance's module manager.
 157          * @return ApiModuleManager
 158          */
 159         public function getModuleManager() {
 160                 return $this->mModuleMgr;
 161         }
 162
 163         /**
 164          * Get the query database connection with the given name.
 165          * If no such connection has been requested before, it will be created.
 166          * Subsequent calls with the same $name will return the same connection
 167          * as the first, regardless of the values of $db and $groups
 168          * @param string $name Name to assign to the database connection
 169          * @param int $db One of the DB_* constants
 170          * @param array $groups Query groups
 171          * @return DatabaseBase
 172          */
 173         public function getNamedDB( $name, $db, $groups ) {
 174                 if ( !array_key_exists( $name, $this->mNamedDB ) ) {
 175                         $this->mNamedDB[$name] = wfGetDB( $db, $groups );
 176                 }
 177
 178                 return $this->mNamedDB[$name];
 179         }
 180
 181         /**
 182          * Gets the set of pages the user has requested (or generated)
 183          * @return ApiPageSet
 184          */
 185         public function getPageSet() {
 186                 return $this->mPageSet;
 187         }
 188
 189         /**
 190          * @return ApiFormatRaw|null
 191          */
 192         public function getCustomPrinter() {
 193                 // If &exportnowrap is set, use the raw formatter
 194                 if ( $this->getParameter( 'export' ) &&
 195                         $this->getParameter( 'exportnowrap' )
 196                 ) {
 197                         return new ApiFormatRaw( $this->getMain(),
 198                                 $this->getMain()->createPrinterByName( 'xml' ) );
 199                 } else {
 200                         return null;
 201                 }
 202         }
 203
 204         /**
 205          * Query execution happens in the following steps:
 206          * #1 Create a PageSet object with any pages requested by the user
 207          * #2 If using a generator, execute it to get a new ApiPageSet object
 208          * #3 Instantiate all requested modules.
 209          *    This way the PageSet object will know what shared data is required,
 210          *    and minimize DB calls.
 211          * #4 Output all normalization and redirect resolution information
 212          * #5 Execute all requested modules
 213          */
 214         public function execute() {
 215                 $this->mParams = $this->extractRequestParams();
 216
 217                 // Instantiate requested modules
 218                 $allModules = [];
 219                 $this->instantiateModules( $allModules, 'prop' );
 220                 $propModules = array_keys( $allModules );
 221                 $this->instantiateModules( $allModules, 'list' );
 222                 $this->instantiateModules( $allModules, 'meta' );
 223
 224                 // Filter modules based on continue parameter
 225                 $continuationManager = new ApiContinuationManager( $this, $allModules, $propModules );
 226                 $this->setContinuationManager( $continuationManager );
 227                 $modules = $continuationManager->getRunModules();
 228
 229                 if ( !$continuationManager->isGeneratorDone() ) {
 230                         // Query modules may optimize data requests through the $this->getPageSet()
 231                         // object by adding extra fields from the page table.
 232                         foreach ( $modules as $module ) {
 233                                 $module->requestExtraData( $this->mPageSet );
 234                         }
 235                         // Populate page/revision information
 236                         $this->mPageSet->execute();
 237                         // Record page information (title, namespace, if exists, etc)
 238                         $this->outputGeneralPageInfo();
 239                 } else {
 240                         $this->mPageSet->executeDryRun();
 241                 }
 242
 243                 $cacheMode = $this->mPageSet->getCacheMode();
 244
 245                 // Execute all unfinished modules
 246                 /** @var $module ApiQueryBase */
 247                 foreach ( $modules as $module ) {
 248                         $params = $module->extractRequestParams();
 249                         $cacheMode = $this->mergeCacheMode(
 250                                 $cacheMode, $module->getCacheMode( $params ) );
 251                         $module->execute();
 252                         Hooks::run( 'APIQueryAfterExecute', [ &$module ] );
 253                 }
 254
 255                 // Set the cache mode
 256                 $this->getMain()->setCacheMode( $cacheMode );
 257
 258                 // Write the continuation data into the result
 259                 $this->setContinuationManager( null );
 260                 if ( $this->mParams['rawcontinue'] ) {
 261                         $data = $continuationManager->getRawContinuation();
 262                         if ( $data ) {
 263                                 $this->getResult()->addValue( null, 'query-continue', $data,
 264                                         ApiResult::ADD_ON_TOP | ApiResult::NO_SIZE_CHECK );
 265                         }
 266                 } else {
 267                         $continuationManager->setContinuationIntoResult( $this->getResult() );
 268                 }
 269         }
 270
 271         /**
 272          * Update a cache mode string, applying the cache mode of a new module to it.
 273          * The cache mode may increase in the level of privacy, but public modules
 274          * added to private data do not decrease the level of privacy.
 275          *
 276          * @param string $cacheMode
 277          * @param string $modCacheMode
 278          * @return string
 279          */
 280         protected function mergeCacheMode( $cacheMode, $modCacheMode ) {
 281                 if ( $modCacheMode === 'anon-public-user-private' ) {
 282                         if ( $cacheMode !== 'private' ) {
 283                                 $cacheMode = 'anon-public-user-private';
 284                         }
 285                 } elseif ( $modCacheMode === 'public' ) {
 286                         // do nothing, if it's public already it will stay public
 287                 } else { // private
 288                         $cacheMode = 'private';
 289                 }
 290
 291                 return $cacheMode;
 292         }
 293
 294         /**
 295          * Create instances of all modules requested by the client
 296          * @param array $modules To append instantiated modules to
 297          * @param string $param Parameter name to read modules from
 298          */
 299         private function instantiateModules( &$modules, $param ) {
 300                 $wasPosted = $this->getRequest()->wasPosted();
 301                 if ( isset( $this->mParams[$param] ) ) {
 302                         foreach ( $this->mParams[$param] as $moduleName ) {
 303                                 $instance = $this->mModuleMgr->getModule( $moduleName, $param );
 304                                 if ( $instance === null ) {
 305                                         ApiBase::dieDebug( __METHOD__, 'Error instantiating module' );
 306                                 }
 307                                 if ( !$wasPosted && $instance->mustBePosted() ) {
 308                                         $this->dieUsageMsgOrDebug( [ 'mustbeposted', $moduleName ] );
 309                                 }
 310                                 // Ignore duplicates. TODO 2.0: die()?
 311                                 if ( !array_key_exists( $moduleName, $modules ) ) {
 312                                         $modules[$moduleName] = $instance;
 313                                 }
 314                         }
 315                 }
 316         }
 317
 318         /**
 319          * Appends an element for each page in the current pageSet with the
 320          * most general information (id, title), plus any title normalizations
 321          * and missing or invalid title/pageids/revids.
 322          */
 323         private function outputGeneralPageInfo() {
 324                 $pageSet = $this->getPageSet();
 325                 $result = $this->getResult();
 326
 327                 // We can't really handle max-result-size failure here, but we need to
 328                 // check anyway in case someone set the limit stupidly low.
 329                 $fit = true;
 330
 331                 $values = $pageSet->getNormalizedTitlesAsResult( $result );
 332                 if ( $values ) {
 333                         $fit = $fit && $result->addValue( 'query', 'normalized', $values );
 334                 }
 335                 $values = $pageSet->getConvertedTitlesAsResult( $result );
 336                 if ( $values ) {
 337                         $fit = $fit && $result->addValue( 'query', 'converted', $values );
 338                 }
 339                 $values = $pageSet->getInterwikiTitlesAsResult( $result, $this->mParams['iwurl'] );
 340                 if ( $values ) {
 341                         $fit = $fit && $result->addValue( 'query', 'interwiki', $values );
 342                 }
 343                 $values = $pageSet->getRedirectTitlesAsResult( $result );
 344                 if ( $values ) {
 345                         $fit = $fit && $result->addValue( 'query', 'redirects', $values );
 346                 }
 347                 $values = $pageSet->getMissingRevisionIDsAsResult( $result );
 348                 if ( $values ) {
 349                         $fit = $fit && $result->addValue( 'query', 'badrevids', $values );
 350                 }
 351
 352                 // Page elements
 353                 $pages = [];
 354
 355                 // Report any missing titles
 356                 foreach ( $pageSet->getMissingTitles() as $fakeId => $title ) {
 357                         $vals = [];
 358                         ApiQueryBase::addTitleInfo( $vals, $title );
 359                         $vals['missing'] = true;
 360                         $pages[$fakeId] = $vals;
 361                 }
 362                 // Report any invalid titles
 363                 foreach ( $pageSet->getInvalidTitlesAndReasons() as $fakeId => $data ) {
 364                         $pages[$fakeId] = $data + [ 'invalid' => true ];
 365                 }
 366                 // Report any missing page ids
 367                 foreach ( $pageSet->getMissingPageIDs() as $pageid ) {
 368                         $pages[$pageid] = [
 369                                 'pageid' => $pageid,
 370                                 'missing' => true
 371                         ];
 372                 }
 373                 // Report special pages
 374                 /** @var $title Title */
 375                 foreach ( $pageSet->getSpecialTitles() as $fakeId => $title ) {
 376                         $vals = [];
 377                         ApiQueryBase::addTitleInfo( $vals, $title );
 378                         $vals['special'] = true;
 379                         if ( $title->isSpecialPage() &&
 380                                 !SpecialPageFactory::exists( $title->getDBkey() )
 381                         ) {
 382                                 $vals['missing'] = true;
 383                         } elseif ( $title->getNamespace() == NS_MEDIA &&
 384                                 !wfFindFile( $title )
 385                         ) {
 386                                 $vals['missing'] = true;
 387                         }
 388                         $pages[$fakeId] = $vals;
 389                 }
 390
 391                 // Output general page information for found titles
 392                 foreach ( $pageSet->getGoodTitles() as $pageid => $title ) {
 393                         $vals = [];
 394                         $vals['pageid'] = $pageid;
 395                         ApiQueryBase::addTitleInfo( $vals, $title );
 396                         $pages[$pageid] = $vals;
 397                 }
 398
 399                 if ( count( $pages ) ) {
 400                         $pageSet->populateGeneratorData( $pages );
 401                         ApiResult::setArrayType( $pages, 'BCarray' );
 402
 403                         if ( $this->mParams['indexpageids'] ) {
 404                                 $pageIDs = array_keys( ApiResult::stripMetadataNonRecursive( $pages ) );
 405                                 // json treats all map keys as strings - converting to match
 406                                 $pageIDs = array_map( 'strval', $pageIDs );
 407                                 ApiResult::setIndexedTagName( $pageIDs, 'id' );
 408                                 $fit = $fit && $result->addValue( 'query', 'pageids', $pageIDs );
 409                         }
 410
 411                         ApiResult::setIndexedTagName( $pages, 'page' );
 412                         $fit = $fit && $result->addValue( 'query', 'pages', $pages );
 413                 }
 414
 415                 if ( !$fit ) {
 416                         $this->dieUsage(
 417                                 'The value of $wgAPIMaxResultSize on this wiki is ' .
 418                                         'too small to hold basic result information',
 419                                 'badconfig'
 420                         );
 421                 }
 422
 423                 if ( $this->mParams['export'] ) {
 424                         $this->doExport( $pageSet, $result );
 425                 }
 426         }
 427
 428         /**
 429          * @param ApiPageSet $pageSet Pages to be exported
 430          * @param ApiResult $result Result to output to
 431          */
 432         private function doExport( $pageSet, $result ) {
 433                 $exportTitles = [];
 434                 $titles = $pageSet->getGoodTitles();
 435                 if ( count( $titles ) ) {
 436                         $user = $this->getUser();
 437                         /** @var $title Title */
 438                         foreach ( $titles as $title ) {
 439                                 if ( $title->userCan( 'read', $user ) ) {
 440                                         $exportTitles[] = $title;
 441                                 }
 442                         }
 443                 }
 444
 445                 $exporter = new WikiExporter( $this->getDB() );
 446                 $sink = new DumpStringOutput;
 447                 $exporter->setOutputSink( $sink );
 448                 $exporter->openStream();
 449                 foreach ( $exportTitles as $title ) {
 450                         $exporter->pageByTitle( $title );
 451                 }
 452                 $exporter->closeStream();
 453
 454                 // Don't check the size of exported stuff
 455                 // It's not continuable, so it would cause more
 456                 // problems than it'd solve
 457                 if ( $this->mParams['exportnowrap'] ) {
 458                         $result->reset();
 459                         // Raw formatter will handle this
 460                         $result->addValue( null, 'text', $sink, ApiResult::NO_SIZE_CHECK );
 461                         $result->addValue( null, 'mime', 'text/xml', ApiResult::NO_SIZE_CHECK );
 462                 } else {
 463                         $result->addValue( 'query', 'export', $sink, ApiResult::NO_SIZE_CHECK );
 464                         $result->addValue( 'query', ApiResult::META_BC_SUBELEMENTS, [ 'export' ] );
 465                 }
 466         }
 467
 468         public function getAllowedParams( $flags = 0 ) {
 469                 $result = [
 470                         'prop' => [
 471                                 ApiBase::PARAM_ISMULTI => true,
 472                                 ApiBase::PARAM_TYPE => 'submodule',
 473                         ],
 474                         'list' => [
 475                                 ApiBase::PARAM_ISMULTI => true,
 476                                 ApiBase::PARAM_TYPE => 'submodule',
 477                         ],
 478                         'meta' => [
 479                                 ApiBase::PARAM_ISMULTI => true,
 480                                 ApiBase::PARAM_TYPE => 'submodule',
 481                         ],
 482                         'indexpageids' => false,
 483                         'export' => false,
 484                         'exportnowrap' => false,
 485                         'iwurl' => false,
 486                         'continue' => [
 487                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
 488                         ],
 489                         'rawcontinue' => false,
 490                 ];
 491                 if ( $flags ) {
 492                         $result += $this->getPageSet()->getFinalParams( $flags );
 493                 }
 494
 495                 return $result;
 496         }
 497
 498         /**
 499          * Override the parent to generate help messages for all available query modules.
 500          * @deprecated since 1.25
 501          * @return string
 502          */
 503         public function makeHelpMsg() {
 504                 wfDeprecated( __METHOD__, '1.25' );
 505
 506                 // Use parent to make default message for the query module
 507                 $msg = parent::makeHelpMsg();
 508
 509                 $querySeparator = str_repeat( '--- ', 12 );
 510                 $moduleSeparator = str_repeat( '*** ', 14 );
 511                 $msg .= "\n$querySeparator Query: Prop  $querySeparator\n\n";
 512                 $msg .= $this->makeHelpMsgHelper( 'prop' );
 513                 $msg .= "\n$querySeparator Query: List  $querySeparator\n\n";
 514                 $msg .= $this->makeHelpMsgHelper( 'list' );
 515                 $msg .= "\n$querySeparator Query: Meta  $querySeparator\n\n";
 516                 $msg .= $this->makeHelpMsgHelper( 'meta' );
 517                 $msg .= "\n\n$moduleSeparator Modules: continuation  $moduleSeparator\n\n";
 518
 519                 return $msg;
 520         }
 521
 522         /**
 523          * For all modules of a given group, generate help messages and join them together
 524          * @deprecated since 1.25
 525          * @param string $group Module group
 526          * @return string
 527          */
 528         private function makeHelpMsgHelper( $group ) {
 529                 $moduleDescriptions = [];
 530
 531                 $moduleNames = $this->mModuleMgr->getNames( $group );
 532                 sort( $moduleNames );
 533                 foreach ( $moduleNames as $name ) {
 534                         /**
 535                          * @var $module ApiQueryBase
 536                          */
 537                         $module = $this->mModuleMgr->getModule( $name );
 538
 539                         $msg = ApiMain::makeHelpMsgHeader( $module, $group );
 540                         $msg2 = $module->makeHelpMsg();
 541                         if ( $msg2 !== false ) {
 542                                 $msg .= $msg2;
 543                         }
 544                         if ( $module instanceof ApiQueryGeneratorBase ) {
 545                                 $msg .= "Generator:\n  This module may be used as a generator\n";
 546                         }
 547                         $moduleDescriptions[] = $msg;
 548                 }
 549
 550                 return implode( "\n", $moduleDescriptions );
 551         }
 552
 553         public function isReadMode() {
 554                 // We need to make an exception for certain meta modules that should be
 555                 // accessible even without the 'read' right. Restrict the exception as
 556                 // much as possible: no other modules allowed, and no pageset
 557                 // parameters either. We do allow the 'rawcontinue' and 'indexpageids'
 558                 // parameters since frameworks might add these unconditionally and they
 559                 // can't expose anything here.
 560                 $this->mParams = $this->extractRequestParams();
 561                 $params = array_filter(
 562                         array_diff_key(
 563                                 $this->mParams + $this->getPageSet()->extractRequestParams(),
 564                                 [ 'rawcontinue' => 1, 'indexpageids' => 1 ]
 565                         )
 566                 );
 567                 if ( array_keys( $params ) !== [ 'meta' ] ) {
 568                         return true;
 569                 }
 570
 571                 // Ask each module if it requires read mode. Any true => this returns
 572                 // true.
 573                 $modules = [];
 574                 $this->instantiateModules( $modules, 'meta' );
 575                 foreach ( $modules as $module ) {
 576                         if ( $module->isReadMode() ) {
 577                                 return true;
 578                         }
 579                 }
 580
 581                 return false;
 582         }
 583
 584         protected function getExamplesMessages() {
 585                 return [
 586                         'action=query&prop=revisions&meta=siteinfo&' .
 587                                 'titles=Main%20Page&rvprop=user|comment&continue='
 588                                 => 'apihelp-query-example-revisions',
 589                         'action=query&generator=allpages&gapprefix=API/&prop=revisions&continue='
 590                                 => 'apihelp-query-example-allpages',
 591                 ];
 592         }
 593
 594         public function getHelpUrls() {
 595                 return [
 596                         'https://www.mediawiki.org/wiki/API:Query',
 597                         'https://www.mediawiki.org/wiki/API:Meta',
 598                         'https://www.mediawiki.org/wiki/API:Properties',
 599                         'https://www.mediawiki.org/wiki/API:Lists',
 600                 ];
 601         }
 602 }