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 ( !MediaWikiServices::getInstance()->getPermissionManager()
  80                                 ->userHasRight( $wgUser, 'rollback' ) ) {
  81                         return false;
  82                 }
  83
  84                 return $wgUser->getEditToken( 'rollback' );
  85         }
  86
  87         protected function run( ApiPageSet $resultPageSet = null ) {
  88                 $params = $this->extractRequestParams( false );
  89                 $revisionStore = MediaWikiServices::getInstance()->getRevisionStore();
  90
  91                 // If any of those parameters are used, work in 'enumeration' mode.
  92                 // Enum mode can only be used when exactly one page is provided.
  93                 // Enumerating revisions on multiple pages make it extremely
  94                 // difficult to manage continuations and require additional SQL indexes
  95                 $enumRevMode = ( $params['user'] !== null || $params['excludeuser'] !== null ||
  96                         $params['limit'] !== null || $params['startid'] !== null ||
  97                         $params['endid'] !== null || $params['dir'] === 'newer' ||
  98                         $params['start'] !== null || $params['end'] !== null );
  99
 100                 $pageSet = $this->getPageSet();
 101                 $pageCount = $pageSet->getGoodTitleCount();
 102                 $revCount = $pageSet->getRevisionCount();
 103
 104                 // Optimization -- nothing to do
 105                 if ( $revCount === 0 && $pageCount === 0 ) {
 106                         // Nothing to do
 107                         return;
 108                 }
 109                 if ( $revCount > 0 && count( $pageSet->getLiveRevisionIDs() ) === 0 ) {
 110                         // We're in revisions mode but all given revisions are deleted
 111                         return;
 112                 }
 113
 114                 if ( $revCount > 0 && $enumRevMode ) {
 115                         $this->dieWithError(
 116                                 [ 'apierror-revisions-norevids', $this->getModulePrefix() ], 'invalidparammix'
 117                         );
 118                 }
 119
 120                 if ( $pageCount > 1 && $enumRevMode ) {
 121                         $this->dieWithError(
 122                                 [ 'apierror-revisions-singlepage', $this->getModulePrefix() ], 'invalidparammix'
 123                         );
 124                 }
 125
 126                 // In non-enum mode, rvlimit can't be directly used. Use the maximum
 127                 // allowed value.
 128                 if ( !$enumRevMode ) {
 129                         $this->setParsedLimit = false;
 130                         $params['limit'] = 'max';
 131                 }
 132
 133                 $db = $this->getDB();
 134
 135                 $idField = 'rev_id';
 136                 $tsField = 'rev_timestamp';
 137                 $pageField = 'rev_page';
 138                 if ( $params['user'] !== null ) {
 139                         // We're going to want to use the page_actor_timestamp index (on revision_actor_temp)
 140                         // so use that table's denormalized fields.
 141                         $idField = 'revactor_rev';
 142                         $tsField = 'revactor_timestamp';
 143                         $pageField = 'revactor_page';
 144                 }
 145
 146                 if ( $resultPageSet === null ) {
 147                         $this->parseParameters( $params );
 148                         $this->token = $params['token'];
 149                         $opts = [];
 150                         if ( $this->token !== null || $pageCount > 0 ) {
 151                                 $opts[] = 'page';
 152                         }
 153                         if ( $this->fld_user ) {
 154                                 $opts[] = 'user';
 155                         }
 156                         $revQuery = $revisionStore->getQueryInfo( $opts );
 157
 158                         if ( $idField !== 'rev_id' ) {
 159                                 $aliasFields = [ 'rev_id' => $idField, 'rev_timestamp' => $tsField, 'rev_page' => $pageField ];
 160                                 $revQuery['fields'] = array_merge(
 161                                         $aliasFields,
 162                                         array_diff( $revQuery['fields'], array_keys( $aliasFields ) )
 163                                 );
 164                         }
 165
 166                         $this->addTables( $revQuery['tables'] );
 167                         $this->addFields( $revQuery['fields'] );
 168                         $this->addJoinConds( $revQuery['joins'] );
 169                 } else {
 170                         $this->limit = $this->getParameter( 'limit' ) ?: 10;
 171                         // Always join 'page' so orphaned revisions are filtered out
 172                         $this->addTables( [ 'revision', 'page' ] );
 173                         $this->addJoinConds(
 174                                 [ 'page' => [ 'JOIN', [ 'page_id = rev_page' ] ] ]
 175                         );
 176                         $this->addFields( [
 177                                 'rev_id' => $idField, 'rev_timestamp' => $tsField, 'rev_page' => $pageField
 178                         ] );
 179                 }
 180
 181                 if ( $this->fld_tags ) {
 182                         $this->addFields( [ 'ts_tags' => ChangeTags::makeTagSummarySubquery( 'revision' ) ] );
 183                 }
 184
 185                 if ( $params['tag'] !== null ) {
 186                         $this->addTables( 'change_tag' );
 187                         $this->addJoinConds(
 188                                 [ 'change_tag' => [ 'JOIN', [ 'rev_id=ct_rev_id' ] ] ]
 189                         );
 190                         $changeTagDefStore = MediaWikiServices::getInstance()->getChangeTagDefStore();
 191                         try {
 192                                 $this->addWhereFld( 'ct_tag_id', $changeTagDefStore->getId( $params['tag'] ) );
 193                         } catch ( NameTableAccessException $exception ) {
 194                                 // Return nothing.
 195                                 $this->addWhere( '1=0' );
 196                         }
 197                 }
 198
 199                 if ( $resultPageSet === null && $this->fetchContent ) {
 200                         // For each page we will request, the user must have read rights for that page
 201                         $status = Status::newGood();
 202                         $user = $this->getUser();
 203
 204                         /** @var Title $title */
 205                         foreach ( $pageSet->getGoodTitles() as $title ) {
 206                                 if ( !$this->getPermissionManager()->userCan( 'read', $user, $title ) ) {
 207                                         $status->fatal( ApiMessage::create(
 208                                                 [ 'apierror-cannotviewtitle', wfEscapeWikiText( $title->getPrefixedText() ) ],
 209                                                 'accessdenied'
 210                                         ) );
 211                                 }
 212                         }
 213                         if ( !$status->isGood() ) {
 214                                 $this->dieStatus( $status );
 215                         }
 216                 }
 217
 218                 if ( $enumRevMode ) {
 219                         // Indexes targeted:
 220                         //  page_timestamp if we don't have rvuser
 221                         //  page_actor_timestamp (on revision_actor_temp) if we have rvuser in READ_NEW mode
 222                         //  page_user_timestamp if we have a logged-in rvuser
 223                         //  page_timestamp or usertext_timestamp if we have an IP rvuser
 224
 225                         // This is mostly to prevent parameter errors (and optimize SQL?)
 226                         $this->requireMaxOneParameter( $params, 'startid', 'start' );
 227                         $this->requireMaxOneParameter( $params, 'endid', 'end' );
 228                         $this->requireMaxOneParameter( $params, 'user', 'excludeuser' );
 229
 230                         if ( $params['continue'] !== null ) {
 231                                 $cont = explode( '|', $params['continue'] );
 232                                 $this->dieContinueUsageIf( count( $cont ) != 2 );
 233                                 $op = ( $params['dir'] === 'newer' ? '>' : '<' );
 234                                 $continueTimestamp = $db->addQuotes( $db->timestamp( $cont[0] ) );
 235                                 $continueId = (int)$cont[1];
 236                                 $this->dieContinueUsageIf( $continueId != $cont[1] );
 237                                 $this->addWhere( "$tsField $op $continueTimestamp OR " .
 238                                         "($tsField = $continueTimestamp AND " .
 239                                         "$idField $op= $continueId)"
 240                                 );
 241                         }
 242
 243                         // Convert startid/endid to timestamps (T163532)
 244                         $revids = [];
 245                         if ( $params['startid'] !== null ) {
 246                                 $revids[] = (int)$params['startid'];
 247                         }
 248                         if ( $params['endid'] !== null ) {
 249                                 $revids[] = (int)$params['endid'];
 250                         }
 251                         if ( $revids ) {
 252                                 $db = $this->getDB();
 253                                 $sql = $db->unionQueries( [
 254                                         $db->selectSQLText(
 255                                                 'revision',
 256                                                 [ 'id' => 'rev_id', 'ts' => 'rev_timestamp' ],
 257                                                 [ 'rev_id' => $revids ],
 258                                                 __METHOD__
 259                                         ),
 260                                         $db->selectSQLText(
 261                                                 'archive',
 262                                                 [ 'id' => 'ar_rev_id', 'ts' => 'ar_timestamp' ],
 263                                                 [ 'ar_rev_id' => $revids ],
 264                                                 __METHOD__
 265                                         ),
 266                                 ], $db::UNION_DISTINCT );
 267                                 $res = $db->query( $sql, __METHOD__ );
 268                                 foreach ( $res as $row ) {
 269                                         if ( (int)$row->id === (int)$params['startid'] ) {
 270                                                 $params['start'] = $row->ts;
 271                                         }
 272                                         if ( (int)$row->id === (int)$params['endid'] ) {
 273                                                 $params['end'] = $row->ts;
 274                                         }
 275                                 }
 276                                 if ( $params['startid'] !== null && $params['start'] === null ) {
 277                                         $p = $this->encodeParamName( 'startid' );
 278                                         $this->dieWithError( [ 'apierror-revisions-badid', $p ], "badid_$p" );
 279                                 }
 280                                 if ( $params['endid'] !== null && $params['end'] === null ) {
 281                                         $p = $this->encodeParamName( 'endid' );
 282                                         $this->dieWithError( [ 'apierror-revisions-badid', $p ], "badid_$p" );
 283                                 }
 284
 285                                 if ( $params['start'] !== null ) {
 286                                         $op = ( $params['dir'] === 'newer' ? '>' : '<' );
 287                                         $ts = $db->addQuotes( $db->timestampOrNull( $params['start'] ) );
 288                                         if ( $params['startid'] !== null ) {
 289                                                 $this->addWhere( "$tsField $op $ts OR "
 290                                                         . "$tsField = $ts AND $idField $op= " . (int)$params['startid'] );
 291                                         } else {
 292                                                 $this->addWhere( "$tsField $op= $ts" );
 293                                         }
 294                                 }
 295                                 if ( $params['end'] !== null ) {
 296                                         $op = ( $params['dir'] === 'newer' ? '<' : '>' ); // Yes, opposite of the above
 297                                         $ts = $db->addQuotes( $db->timestampOrNull( $params['end'] ) );
 298                                         if ( $params['endid'] !== null ) {
 299                                                 $this->addWhere( "$tsField $op $ts OR "
 300                                                         . "$tsField = $ts AND $idField $op= " . (int)$params['endid'] );
 301                                         } else {
 302                                                 $this->addWhere( "$tsField $op= $ts" );
 303                                         }
 304                                 }
 305                         } else {
 306                                 $this->addTimestampWhereRange( $tsField, $params['dir'],
 307                                         $params['start'], $params['end'] );
 308                         }
 309
 310                         $sort = ( $params['dir'] === 'newer' ? '' : 'DESC' );
 311                         $this->addOption( 'ORDER BY', [ "rev_timestamp $sort", "rev_id $sort" ] );
 312
 313                         // There is only one ID, use it
 314                         $ids = array_keys( $pageSet->getGoodTitles() );
 315                         $this->addWhereFld( $pageField, reset( $ids ) );
 316
 317                         if ( $params['user'] !== null ) {
 318                                 $actorQuery = ActorMigration::newMigration()
 319                                         ->getWhere( $db, 'rev_user', User::newFromName( $params['user'], false ) );
 320                                 $this->addTables( $actorQuery['tables'] );
 321                                 $this->addJoinConds( $actorQuery['joins'] );
 322                                 $this->addWhere( $actorQuery['conds'] );
 323                         } elseif ( $params['excludeuser'] !== null ) {
 324                                 $actorQuery = ActorMigration::newMigration()
 325                                         ->getWhere( $db, 'rev_user', User::newFromName( $params['excludeuser'], false ) );
 326                                 $this->addTables( $actorQuery['tables'] );
 327                                 $this->addJoinConds( $actorQuery['joins'] );
 328                                 $this->addWhere( 'NOT(' . $actorQuery['conds'] . ')' );
 329                         }
 330                         if ( $params['user'] !== null || $params['excludeuser'] !== null ) {
 331                                 // Paranoia: avoid brute force searches (T19342)
 332                                 if ( !$this->getPermissionManager()->userHasRight( $this->getUser(), 'deletedhistory' ) ) {
 333                                         $bitmask = RevisionRecord::DELETED_USER;
 334                                 } elseif ( !$this->getPermissionManager()
 335                                         ->userHasAnyRight( $this->getUser(), 'suppressrevision', 'viewsuppressed' )
 336                                 ) {
 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                 // T224017: `rev_timestamp` is never the correct index to use for this module, but
 393                 // MariaDB (10.1.37-39) sometimes insists on trying to use it anyway. Tell it not to.
 394                 $this->addOption( 'IGNORE INDEX', [ 'revision' => 'rev_timestamp' ] );
 395
 396                 $count = 0;
 397                 $generated = [];
 398                 $hookData = [];
 399                 $res = $this->select( __METHOD__, [], $hookData );
 400
 401                 foreach ( $res as $row ) {
 402                         if ( ++$count > $this->limit ) {
 403                                 // We've reached the one extra which shows that there are
 404                                 // additional pages to be had. Stop here...
 405                                 if ( $enumRevMode ) {
 406                                         $this->setContinueEnumParameter( 'continue',
 407                                                 $row->rev_timestamp . '|' . (int)$row->rev_id );
 408                                 } elseif ( $revCount > 0 ) {
 409                                         $this->setContinueEnumParameter( 'continue', (int)$row->rev_id );
 410                                 } else {
 411                                         $this->setContinueEnumParameter( 'continue', (int)$row->rev_page .
 412                                                 '|' . (int)$row->rev_id );
 413                                 }
 414                                 break;
 415                         }
 416
 417                         if ( $resultPageSet !== null ) {
 418                                 $generated[] = $row->rev_id;
 419                         } else {
 420                                 $revision = $revisionStore->newRevisionFromRow( $row );
 421                                 $rev = $this->extractRevisionInfo( $revision, $row );
 422
 423                                 if ( $this->token !== null ) {
 424                                         $title = Title::newFromLinkTarget( $revision->getPageAsLinkTarget() );
 425                                         $revisionCompat = new Revision( $revision );
 426                                         $tokenFunctions = $this->getTokenFunctions();
 427                                         foreach ( $this->token as $t ) {
 428                                                 $val = call_user_func( $tokenFunctions[$t], $title->getArticleID(), $title, $revisionCompat );
 429                                                 if ( $val === false ) {
 430                                                         $this->addWarning( [ 'apiwarn-tokennotallowed', $t ] );
 431                                                 } else {
 432                                                         $rev[$t . 'token'] = $val;
 433                                                 }
 434                                         }
 435                                 }
 436
 437                                 $fit = $this->processRow( $row, $rev, $hookData ) &&
 438                                         $this->addPageSubItem( $row->rev_page, $rev, 'rev' );
 439                                 if ( !$fit ) {
 440                                         if ( $enumRevMode ) {
 441                                                 $this->setContinueEnumParameter( 'continue',
 442                                                         $row->rev_timestamp . '|' . (int)$row->rev_id );
 443                                         } elseif ( $revCount > 0 ) {
 444                                                 $this->setContinueEnumParameter( 'continue', (int)$row->rev_id );
 445                                         } else {
 446                                                 $this->setContinueEnumParameter( 'continue', (int)$row->rev_page .
 447                                                         '|' . (int)$row->rev_id );
 448                                         }
 449                                         break;
 450                                 }
 451                         }
 452                 }
 453
 454                 if ( $resultPageSet !== null ) {
 455                         $resultPageSet->populateFromRevisionIDs( $generated );
 456                 }
 457         }
 458
 459         public function getCacheMode( $params ) {
 460                 if ( isset( $params['token'] ) ) {
 461                         return 'private';
 462                 }
 463                 return parent::getCacheMode( $params );
 464         }
 465
 466         public function getAllowedParams() {
 467                 $ret = parent::getAllowedParams() + [
 468                         'startid' => [
 469                                 ApiBase::PARAM_TYPE => 'integer',
 470                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 471                         ],
 472                         'endid' => [
 473                                 ApiBase::PARAM_TYPE => 'integer',
 474                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 475                         ],
 476                         'start' => [
 477                                 ApiBase::PARAM_TYPE => 'timestamp',
 478                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 479                         ],
 480                         'end' => [
 481                                 ApiBase::PARAM_TYPE => 'timestamp',
 482                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 483                         ],
 484                         'dir' => [
 485                                 ApiBase::PARAM_DFLT => 'older',
 486                                 ApiBase::PARAM_TYPE => [
 487                                         'newer',
 488                                         'older'
 489                                 ],
 490                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
 491                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 492                         ],
 493                         'user' => [
 494                                 ApiBase::PARAM_TYPE => 'user',
 495                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 496                         ],
 497                         'excludeuser' => [
 498                                 ApiBase::PARAM_TYPE => 'user',
 499                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 500                         ],
 501                         'tag' => null,
 502                         'token' => [
 503                                 ApiBase::PARAM_DEPRECATED => true,
 504                                 ApiBase::PARAM_TYPE => array_keys( $this->getTokenFunctions() ),
 505                                 ApiBase::PARAM_ISMULTI => true
 506                         ],
 507                         'continue' => [
 508                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
 509                         ],
 510                 ];
 511
 512                 $ret['limit'][ApiBase::PARAM_HELP_MSG_INFO] = [ [ 'singlepageonly' ] ];
 513
 514                 return $ret;
 515         }
 516
 517         protected function getExamplesMessages() {
 518                 return [
 519                         'action=query&prop=revisions&titles=API|Main%20Page&' .
 520                                 'rvslots=*&rvprop=timestamp|user|comment|content'
 521                                 => 'apihelp-query+revisions-example-content',
 522                         'action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 523                                 'rvprop=timestamp|user|comment'
 524                                 => 'apihelp-query+revisions-example-last5',
 525                         'action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 526                                 'rvprop=timestamp|user|comment&rvdir=newer'
 527                                 => 'apihelp-query+revisions-example-first5',
 528                         'action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 529                                 'rvprop=timestamp|user|comment&rvdir=newer&rvstart=2006-05-01T00:00:00Z'
 530                                 => 'apihelp-query+revisions-example-first5-after',
 531                         'action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 532                                 'rvprop=timestamp|user|comment&rvexcludeuser=127.0.0.1'
 533                                 => 'apihelp-query+revisions-example-first5-not-localhost',
 534                         'action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 535                                 'rvprop=timestamp|user|comment&rvuser=MediaWiki%20default'
 536                                 => 'apihelp-query+revisions-example-first5-user',
 537                 ];
 538         }
 539
 540         public function getHelpUrls() {
 541                 return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Revisions';
 542         }
 543 }