includes/api/ApiQueryRevisions.php

   1 <?php
   2 /**
   3  * Copyright © 2006 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
  23 use MediaWiki\MediaWikiServices;
  24 use MediaWiki\Revision\RevisionRecord;
  25 use MediaWiki\Storage\NameTableAccessException;
  26
  27 /**
  28  * A query action to enumerate revisions of a given page, or show top revisions
  29  * of multiple pages. Various pieces of information may be shown - flags,
  30  * comments, and the actual wiki markup of the rev. In the enumeration mode,
  31  * ranges of revisions may be requested and filtered.
  32  *
  33  * @ingroup API
  34  */
  35 class ApiQueryRevisions extends ApiQueryRevisionsBase {
  36
  37         private $token = null;
  38
  39         public function __construct( ApiQuery $query, $moduleName ) {
  40                 parent::__construct( $query, $moduleName, 'rv' );
  41         }
  42
  43         private $tokenFunctions;
  44
  45         /** @deprecated since 1.24 */
  46         protected function getTokenFunctions() {
  47                 // tokenname => function
  48                 // function prototype is func($pageid, $title, $rev)
  49                 // should return token or false
  50
  51                 // Don't call the hooks twice
  52                 if ( isset( $this->tokenFunctions ) ) {
  53                         return $this->tokenFunctions;
  54                 }
  55
  56                 // If we're in a mode that breaks the same-origin policy, no tokens can
  57                 // be obtained
  58                 if ( $this->lacksSameOriginSecurity() ) {
  59                         return [];
  60                 }
  61
  62                 $this->tokenFunctions = [
  63                         'rollback' => [ self::class, 'getRollbackToken' ]
  64                 ];
  65                 Hooks::run( 'APIQueryRevisionsTokens', [ &$this->tokenFunctions ] );
  66
  67                 return $this->tokenFunctions;
  68         }
  69
  70         /**
  71          * @deprecated since 1.24
  72          * @param int $pageid
  73          * @param Title $title
  74          * @param Revision $rev
  75          * @return bool|string
  76          */
  77         public static function getRollbackToken( $pageid, $title, $rev ) {
  78                 global $wgUser;
  79                 if ( !$wgUser->isAllowed( 'rollback' ) ) {
  80                         return false;
  81                 }
  82
  83                 return $wgUser->getEditToken( 'rollback' );
  84         }
  85
  86         protected function run( ApiPageSet $resultPageSet = null ) {
  87                 global $wgActorTableSchemaMigrationStage;
  88
  89                 $params = $this->extractRequestParams( false );
  90                 $revisionStore = MediaWikiServices::getInstance()->getRevisionStore();
  91
  92                 // If any of those parameters are used, work in 'enumeration' mode.
  93                 // Enum mode can only be used when exactly one page is provided.
  94                 // Enumerating revisions on multiple pages make it extremely
  95                 // difficult to manage continuations and require additional SQL indexes
  96                 $enumRevMode = ( $params['user'] !== null || $params['excludeuser'] !== null ||
  97                         $params['limit'] !== null || $params['startid'] !== null ||
  98                         $params['endid'] !== null || $params['dir'] === 'newer' ||
  99                         $params['start'] !== null || $params['end'] !== null );
 100
 101                 $pageSet = $this->getPageSet();
 102                 $pageCount = $pageSet->getGoodTitleCount();
 103                 $revCount = $pageSet->getRevisionCount();
 104
 105                 // Optimization -- nothing to do
 106                 if ( $revCount === 0 && $pageCount === 0 ) {
 107                         // Nothing to do
 108                         return;
 109                 }
 110                 if ( $revCount > 0 && count( $pageSet->getLiveRevisionIDs() ) === 0 ) {
 111                         // We're in revisions mode but all given revisions are deleted
 112                         return;
 113                 }
 114
 115                 if ( $revCount > 0 && $enumRevMode ) {
 116                         $this->dieWithError(
 117                                 [ 'apierror-revisions-nolist', $this->getModulePrefix() ], 'invalidparammix'
 118                         );
 119                 }
 120
 121                 if ( $pageCount > 1 && $enumRevMode ) {
 122                         $this->dieWithError(
 123                                 [ 'apierror-revisions-singlepage', $this->getModulePrefix() ], 'invalidparammix'
 124                         );
 125                 }
 126
 127                 // In non-enum mode, rvlimit can't be directly used. Use the maximum
 128                 // allowed value.
 129                 if ( !$enumRevMode ) {
 130                         $this->setParsedLimit = false;
 131                         $params['limit'] = 'max';
 132                 }
 133
 134                 $db = $this->getDB();
 135
 136                 $idField = 'rev_id';
 137                 $tsField = 'rev_timestamp';
 138                 $pageField = 'rev_page';
 139                 if ( $params['user'] !== null &&
 140                         ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW )
 141                 ) {
 142                         // We're going to want to use the page_actor_timestamp index (on revision_actor_temp)
 143                         // so use that table's denormalized fields.
 144                         $idField = 'revactor_rev';
 145                         $tsField = 'revactor_timestamp';
 146                         $pageField = 'revactor_page';
 147                 }
 148
 149                 if ( $resultPageSet === null ) {
 150                         $this->parseParameters( $params );
 151                         $this->token = $params['token'];
 152                         $opts = [];
 153                         if ( $this->token !== null || $pageCount > 0 ) {
 154                                 $opts[] = 'page';
 155                         }
 156                         if ( $this->fld_user ) {
 157                                 $opts[] = 'user';
 158                         }
 159                         $revQuery = $revisionStore->getQueryInfo( $opts );
 160
 161                         if ( $idField !== 'rev_id' ) {
 162                                 $aliasFields = [ 'rev_id' => $idField, 'rev_timestamp' => $tsField, 'rev_page' => $pageField ];
 163                                 $revQuery['fields'] = array_merge(
 164                                         $aliasFields,
 165                                         array_diff( $revQuery['fields'], array_keys( $aliasFields ) )
 166                                 );
 167                         }
 168
 169                         $this->addTables( $revQuery['tables'] );
 170                         $this->addFields( $revQuery['fields'] );
 171                         $this->addJoinConds( $revQuery['joins'] );
 172                 } else {
 173                         $this->limit = $this->getParameter( 'limit' ) ?: 10;
 174                         // Always join 'page' so orphaned revisions are filtered out
 175                         $this->addTables( [ 'revision', 'page' ] );
 176                         $this->addJoinConds(
 177                                 [ 'page' => [ 'JOIN', [ 'page_id = rev_page' ] ] ]
 178                         );
 179                         $this->addFields( [
 180                                 'rev_id' => $idField, 'rev_timestamp' => $tsField, 'rev_page' => $pageField
 181                         ] );
 182                 }
 183
 184                 if ( $this->fld_tags ) {
 185                         $this->addFields( [ 'ts_tags' => ChangeTags::makeTagSummarySubquery( 'revision' ) ] );
 186                 }
 187
 188                 if ( $params['tag'] !== null ) {
 189                         $this->addTables( 'change_tag' );
 190                         $this->addJoinConds(
 191                                 [ 'change_tag' => [ 'JOIN', [ 'rev_id=ct_rev_id' ] ] ]
 192                         );
 193                         $changeTagDefStore = MediaWikiServices::getInstance()->getChangeTagDefStore();
 194                         try {
 195                                 $this->addWhereFld( 'ct_tag_id', $changeTagDefStore->getId( $params['tag'] ) );
 196                         } catch ( NameTableAccessException $exception ) {
 197                                 // Return nothing.
 198                                 $this->addWhere( '1=0' );
 199                         }
 200                 }
 201
 202                 if ( $resultPageSet === null && $this->fetchContent ) {
 203                         // For each page we will request, the user must have read rights for that page
 204                         $user = $this->getUser();
 205                         $status = Status::newGood();
 206                         /** @var Title $title */
 207                         foreach ( $pageSet->getGoodTitles() as $title ) {
 208                                 if ( !$title->userCan( 'read', $user ) ) {
 209                                         $status->fatal( ApiMessage::create(
 210                                                 [ 'apierror-cannotviewtitle', wfEscapeWikiText( $title->getPrefixedText() ) ],
 211                                                 'accessdenied'
 212                                         ) );
 213                                 }
 214                         }
 215                         if ( !$status->isGood() ) {
 216                                 $this->dieStatus( $status );
 217                         }
 218                 }
 219
 220                 if ( $enumRevMode ) {
 221                         // Indexes targeted:
 222                         //  page_timestamp if we don't have rvuser
 223                         //  page_actor_timestamp (on revision_actor_temp) if we have rvuser in READ_NEW mode
 224                         //  page_user_timestamp if we have a logged-in rvuser
 225                         //  page_timestamp or usertext_timestamp if we have an IP rvuser
 226
 227                         // This is mostly to prevent parameter errors (and optimize SQL?)
 228                         $this->requireMaxOneParameter( $params, 'startid', 'start' );
 229                         $this->requireMaxOneParameter( $params, 'endid', 'end' );
 230                         $this->requireMaxOneParameter( $params, 'user', 'excludeuser' );
 231
 232                         if ( $params['continue'] !== null ) {
 233                                 $cont = explode( '|', $params['continue'] );
 234                                 $this->dieContinueUsageIf( count( $cont ) != 2 );
 235                                 $op = ( $params['dir'] === 'newer' ? '>' : '<' );
 236                                 $continueTimestamp = $db->addQuotes( $db->timestamp( $cont[0] ) );
 237                                 $continueId = (int)$cont[1];
 238                                 $this->dieContinueUsageIf( $continueId != $cont[1] );
 239                                 $this->addWhere( "$tsField $op $continueTimestamp OR " .
 240                                         "($tsField = $continueTimestamp AND " .
 241                                         "$idField $op= $continueId)"
 242                                 );
 243                         }
 244
 245                         // Convert startid/endid to timestamps (T163532)
 246                         $revids = [];
 247                         if ( $params['startid'] !== null ) {
 248                                 $revids[] = (int)$params['startid'];
 249                         }
 250                         if ( $params['endid'] !== null ) {
 251                                 $revids[] = (int)$params['endid'];
 252                         }
 253                         if ( $revids ) {
 254                                 $db = $this->getDB();
 255                                 $sql = $db->unionQueries( [
 256                                         $db->selectSQLText(
 257                                                 'revision',
 258                                                 [ 'id' => 'rev_id', 'ts' => 'rev_timestamp' ],
 259                                                 [ 'rev_id' => $revids ],
 260                                                 __METHOD__
 261                                         ),
 262                                         $db->selectSQLText(
 263                                                 'archive',
 264                                                 [ 'id' => 'ar_rev_id', 'ts' => 'ar_timestamp' ],
 265                                                 [ 'ar_rev_id' => $revids ],
 266                                                 __METHOD__
 267                                         ),
 268                                 ], $db::UNION_DISTINCT );
 269                                 $res = $db->query( $sql, __METHOD__ );
 270                                 foreach ( $res as $row ) {
 271                                         if ( (int)$row->id === (int)$params['startid'] ) {
 272                                                 $params['start'] = $row->ts;
 273                                         }
 274                                         if ( (int)$row->id === (int)$params['endid'] ) {
 275                                                 $params['end'] = $row->ts;
 276                                         }
 277                                 }
 278                                 if ( $params['startid'] !== null && $params['start'] === null ) {
 279                                         $p = $this->encodeParamName( 'startid' );
 280                                         $this->dieWithError( [ 'apierror-revisions-badid', $p ], "badid_$p" );
 281                                 }
 282                                 if ( $params['endid'] !== null && $params['end'] === null ) {
 283                                         $p = $this->encodeParamName( 'endid' );
 284                                         $this->dieWithError( [ 'apierror-revisions-badid', $p ], "badid_$p" );
 285                                 }
 286
 287                                 if ( $params['start'] !== null ) {
 288                                         $op = ( $params['dir'] === 'newer' ? '>' : '<' );
 289                                         $ts = $db->addQuotes( $db->timestampOrNull( $params['start'] ) );
 290                                         if ( $params['startid'] !== null ) {
 291                                                 $this->addWhere( "$tsField $op $ts OR "
 292                                                         . "$tsField = $ts AND $idField $op= " . (int)$params['startid'] );
 293                                         } else {
 294                                                 $this->addWhere( "$tsField $op= $ts" );
 295                                         }
 296                                 }
 297                                 if ( $params['end'] !== null ) {
 298                                         $op = ( $params['dir'] === 'newer' ? '<' : '>' ); // Yes, opposite of the above
 299                                         $ts = $db->addQuotes( $db->timestampOrNull( $params['end'] ) );
 300                                         if ( $params['endid'] !== null ) {
 301                                                 $this->addWhere( "$tsField $op $ts OR "
 302                                                         . "$tsField = $ts AND $idField $op= " . (int)$params['endid'] );
 303                                         } else {
 304                                                 $this->addWhere( "$tsField $op= $ts" );
 305                                         }
 306                                 }
 307                         } else {
 308                                 $this->addTimestampWhereRange( $tsField, $params['dir'],
 309                                         $params['start'], $params['end'] );
 310                         }
 311
 312                         $sort = ( $params['dir'] === 'newer' ? '' : 'DESC' );
 313                         $this->addOption( 'ORDER BY', [ "rev_timestamp $sort", "rev_id $sort" ] );
 314
 315                         // There is only one ID, use it
 316                         $ids = array_keys( $pageSet->getGoodTitles() );
 317                         $this->addWhereFld( $pageField, reset( $ids ) );
 318
 319                         if ( $params['user'] !== null ) {
 320                                 $actorQuery = ActorMigration::newMigration()
 321                                         ->getWhere( $db, 'rev_user', User::newFromName( $params['user'], false ) );
 322                                 $this->addTables( $actorQuery['tables'] );
 323                                 $this->addJoinConds( $actorQuery['joins'] );
 324                                 $this->addWhere( $actorQuery['conds'] );
 325                         } elseif ( $params['excludeuser'] !== null ) {
 326                                 $actorQuery = ActorMigration::newMigration()
 327                                         ->getWhere( $db, 'rev_user', User::newFromName( $params['excludeuser'], false ) );
 328                                 $this->addTables( $actorQuery['tables'] );
 329                                 $this->addJoinConds( $actorQuery['joins'] );
 330                                 $this->addWhere( 'NOT(' . $actorQuery['conds'] . ')' );
 331                         }
 332                         if ( $params['user'] !== null || $params['excludeuser'] !== null ) {
 333                                 // Paranoia: avoid brute force searches (T19342)
 334                                 if ( !$this->getUser()->isAllowed( 'deletedhistory' ) ) {
 335                                         $bitmask = RevisionRecord::DELETED_USER;
 336                                 } elseif ( !$this->getUser()->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 337                                         $bitmask = RevisionRecord::DELETED_USER | RevisionRecord::DELETED_RESTRICTED;
 338                                 } else {
 339                                         $bitmask = 0;
 340                                 }
 341                                 if ( $bitmask ) {
 342                                         $this->addWhere( $db->bitAnd( 'rev_deleted', $bitmask ) . " != $bitmask" );
 343                                 }
 344                         }
 345                 } elseif ( $revCount > 0 ) {
 346                         // Always targets the PRIMARY index
 347
 348                         $revs = $pageSet->getLiveRevisionIDs();
 349
 350                         // Get all revision IDs
 351                         $this->addWhereFld( 'rev_id', array_keys( $revs ) );
 352
 353                         if ( $params['continue'] !== null ) {
 354                                 $this->addWhere( 'rev_id >= ' . (int)$params['continue'] );
 355                         }
 356                         $this->addOption( 'ORDER BY', 'rev_id' );
 357                 } elseif ( $pageCount > 0 ) {
 358                         // Always targets the rev_page_id index
 359
 360                         $titles = $pageSet->getGoodTitles();
 361
 362                         // When working in multi-page non-enumeration mode,
 363                         // limit to the latest revision only
 364                         $this->addWhere( 'page_latest=rev_id' );
 365
 366                         // Get all page IDs
 367                         $this->addWhereFld( 'page_id', array_keys( $titles ) );
 368                         // Every time someone relies on equality propagation, god kills a kitten :)
 369                         $this->addWhereFld( 'rev_page', array_keys( $titles ) );
 370
 371                         if ( $params['continue'] !== null ) {
 372                                 $cont = explode( '|', $params['continue'] );
 373                                 $this->dieContinueUsageIf( count( $cont ) != 2 );
 374                                 $pageid = (int)$cont[0];
 375                                 $revid = (int)$cont[1];
 376                                 $this->addWhere(
 377                                         "rev_page > $pageid OR " .
 378                                         "(rev_page = $pageid AND " .
 379                                         "rev_id >= $revid)"
 380                                 );
 381                         }
 382                         $this->addOption( 'ORDER BY', [
 383                                 'rev_page',
 384                                 'rev_id'
 385                         ] );
 386                 } else {
 387                         ApiBase::dieDebug( __METHOD__, 'param validation?' );
 388                 }
 389
 390                 $this->addOption( 'LIMIT', $this->limit + 1 );
 391
 392                 $count = 0;
 393                 $generated = [];
 394                 $hookData = [];
 395                 $res = $this->select( __METHOD__, [], $hookData );
 396
 397                 foreach ( $res as $row ) {
 398                         if ( ++$count > $this->limit ) {
 399                                 // We've reached the one extra which shows that there are
 400                                 // additional pages to be had. Stop here...
 401                                 if ( $enumRevMode ) {
 402                                         $this->setContinueEnumParameter( 'continue',
 403                                                 $row->rev_timestamp . '|' . (int)$row->rev_id );
 404                                 } elseif ( $revCount > 0 ) {
 405                                         $this->setContinueEnumParameter( 'continue', (int)$row->rev_id );
 406                                 } else {
 407                                         $this->setContinueEnumParameter( 'continue', (int)$row->rev_page .
 408                                                 '|' . (int)$row->rev_id );
 409                                 }
 410                                 break;
 411                         }
 412
 413                         if ( $resultPageSet !== null ) {
 414                                 $generated[] = $row->rev_id;
 415                         } else {
 416                                 $revision = $revisionStore->newRevisionFromRow( $row );
 417                                 $rev = $this->extractRevisionInfo( $revision, $row );
 418
 419                                 if ( $this->token !== null ) {
 420                                         $title = Title::newFromLinkTarget( $revision->getPageAsLinkTarget() );
 421                                         $revisionCompat = new Revision( $revision );
 422                                         $tokenFunctions = $this->getTokenFunctions();
 423                                         foreach ( $this->token as $t ) {
 424                                                 $val = call_user_func( $tokenFunctions[$t], $title->getArticleID(), $title, $revisionCompat );
 425                                                 if ( $val === false ) {
 426                                                         $this->addWarning( [ 'apiwarn-tokennotallowed', $t ] );
 427                                                 } else {
 428                                                         $rev[$t . 'token'] = $val;
 429                                                 }
 430                                         }
 431                                 }
 432
 433                                 $fit = $this->processRow( $row, $rev, $hookData ) &&
 434                                         $this->addPageSubItem( $row->rev_page, $rev, 'rev' );
 435                                 if ( !$fit ) {
 436                                         if ( $enumRevMode ) {
 437                                                 $this->setContinueEnumParameter( 'continue',
 438                                                         $row->rev_timestamp . '|' . (int)$row->rev_id );
 439                                         } elseif ( $revCount > 0 ) {
 440                                                 $this->setContinueEnumParameter( 'continue', (int)$row->rev_id );
 441                                         } else {
 442                                                 $this->setContinueEnumParameter( 'continue', (int)$row->rev_page .
 443                                                         '|' . (int)$row->rev_id );
 444                                         }
 445                                         break;
 446                                 }
 447                         }
 448                 }
 449
 450                 if ( $resultPageSet !== null ) {
 451                         $resultPageSet->populateFromRevisionIDs( $generated );
 452                 }
 453         }
 454
 455         public function getCacheMode( $params ) {
 456                 if ( isset( $params['token'] ) ) {
 457                         return 'private';
 458                 }
 459                 return parent::getCacheMode( $params );
 460         }
 461
 462         public function getAllowedParams() {
 463                 $ret = parent::getAllowedParams() + [
 464                         'startid' => [
 465                                 ApiBase::PARAM_TYPE => 'integer',
 466                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 467                         ],
 468                         'endid' => [
 469                                 ApiBase::PARAM_TYPE => 'integer',
 470                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 471                         ],
 472                         'start' => [
 473                                 ApiBase::PARAM_TYPE => 'timestamp',
 474                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 475                         ],
 476                         'end' => [
 477                                 ApiBase::PARAM_TYPE => 'timestamp',
 478                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 479                         ],
 480                         'dir' => [
 481                                 ApiBase::PARAM_DFLT => 'older',
 482                                 ApiBase::PARAM_TYPE => [
 483                                         'newer',
 484                                         'older'
 485                                 ],
 486                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
 487                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 488                         ],
 489                         'user' => [
 490                                 ApiBase::PARAM_TYPE => 'user',
 491                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 492                         ],
 493                         'excludeuser' => [
 494                                 ApiBase::PARAM_TYPE => 'user',
 495                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 496                         ],
 497                         'tag' => null,
 498                         'token' => [
 499                                 ApiBase::PARAM_DEPRECATED => true,
 500                                 ApiBase::PARAM_TYPE => array_keys( $this->getTokenFunctions() ),
 501                                 ApiBase::PARAM_ISMULTI => true
 502                         ],
 503                         'continue' => [
 504                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
 505                         ],
 506                 ];
 507
 508                 $ret['limit'][ApiBase::PARAM_HELP_MSG_INFO] = [ [ 'singlepageonly' ] ];
 509
 510                 return $ret;
 511         }
 512
 513         protected function getExamplesMessages() {
 514                 return [
 515                         'action=query&prop=revisions&titles=API|Main%20Page&' .
 516                                 'rvslots=*&rvprop=timestamp|user|comment|content'
 517                                 => 'apihelp-query+revisions-example-content',
 518                         'action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 519                                 'rvprop=timestamp|user|comment'
 520                                 => 'apihelp-query+revisions-example-last5',
 521                         'action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 522                                 'rvprop=timestamp|user|comment&rvdir=newer'
 523                                 => 'apihelp-query+revisions-example-first5',
 524                         'action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 525                                 'rvprop=timestamp|user|comment&rvdir=newer&rvstart=2006-05-01T00:00:00Z'
 526                                 => 'apihelp-query+revisions-example-first5-after',
 527                         'action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 528                                 'rvprop=timestamp|user|comment&rvexcludeuser=127.0.0.1'
 529                                 => 'apihelp-query+revisions-example-first5-not-localhost',
 530                         'action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 531                                 'rvprop=timestamp|user|comment&rvuser=MediaWiki%20default'
 532                                 => 'apihelp-query+revisions-example-first5-user',
 533                 ];
 534         }
 535
 536         public function getHelpUrls() {
 537                 return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Revisions';
 538         }
 539 }