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                 global $wgActorTableSchemaMigrationStage;
  89
  90                 $params = $this->extractRequestParams( false );
  91                 $revisionStore = MediaWikiServices::getInstance()->getRevisionStore();
  92
  93                 // If any of those parameters are used, work in 'enumeration' mode.
  94                 // Enum mode can only be used when exactly one page is provided.
  95                 // Enumerating revisions on multiple pages make it extremely
  96                 // difficult to manage continuations and require additional SQL indexes
  97                 $enumRevMode = ( $params['user'] !== null || $params['excludeuser'] !== null ||
  98                         $params['limit'] !== null || $params['startid'] !== null ||
  99                         $params['endid'] !== null || $params['dir'] === 'newer' ||
 100                         $params['start'] !== null || $params['end'] !== null );
 101
 102                 $pageSet = $this->getPageSet();
 103                 $pageCount = $pageSet->getGoodTitleCount();
 104                 $revCount = $pageSet->getRevisionCount();
 105
 106                 // Optimization -- nothing to do
 107                 if ( $revCount === 0 && $pageCount === 0 ) {
 108                         // Nothing to do
 109                         return;
 110                 }
 111                 if ( $revCount > 0 && count( $pageSet->getLiveRevisionIDs() ) === 0 ) {
 112                         // We're in revisions mode but all given revisions are deleted
 113                         return;
 114                 }
 115
 116                 if ( $revCount > 0 && $enumRevMode ) {
 117                         $this->dieWithError(
 118                                 [ 'apierror-revisions-norevids', $this->getModulePrefix() ], 'invalidparammix'
 119                         );
 120                 }
 121
 122                 if ( $pageCount > 1 && $enumRevMode ) {
 123                         $this->dieWithError(
 124                                 [ 'apierror-revisions-singlepage', $this->getModulePrefix() ], 'invalidparammix'
 125                         );
 126                 }
 127
 128                 // In non-enum mode, rvlimit can't be directly used. Use the maximum
 129                 // allowed value.
 130                 if ( !$enumRevMode ) {
 131                         $this->setParsedLimit = false;
 132                         $params['limit'] = 'max';
 133                 }
 134
 135                 $db = $this->getDB();
 136
 137                 $idField = 'rev_id';
 138                 $tsField = 'rev_timestamp';
 139                 $pageField = 'rev_page';
 140                 if ( $params['user'] !== null &&
 141                         ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_READ_NEW )
 142                 ) {
 143                         // We're going to want to use the page_actor_timestamp index (on revision_actor_temp)
 144                         // so use that table's denormalized fields.
 145                         $idField = 'revactor_rev';
 146                         $tsField = 'revactor_timestamp';
 147                         $pageField = 'revactor_page';
 148                 }
 149
 150                 if ( $resultPageSet === null ) {
 151                         $this->parseParameters( $params );
 152                         $this->token = $params['token'];
 153                         $opts = [];
 154                         if ( $this->token !== null || $pageCount > 0 ) {
 155                                 $opts[] = 'page';
 156                         }
 157                         if ( $this->fld_user ) {
 158                                 $opts[] = 'user';
 159                         }
 160                         $revQuery = $revisionStore->getQueryInfo( $opts );
 161
 162                         if ( $idField !== 'rev_id' ) {
 163                                 $aliasFields = [ 'rev_id' => $idField, 'rev_timestamp' => $tsField, 'rev_page' => $pageField ];
 164                                 $revQuery['fields'] = array_merge(
 165                                         $aliasFields,
 166                                         array_diff( $revQuery['fields'], array_keys( $aliasFields ) )
 167                                 );
 168                         }
 169
 170                         $this->addTables( $revQuery['tables'] );
 171                         $this->addFields( $revQuery['fields'] );
 172                         $this->addJoinConds( $revQuery['joins'] );
 173                 } else {
 174                         $this->limit = $this->getParameter( 'limit' ) ?: 10;
 175                         // Always join 'page' so orphaned revisions are filtered out
 176                         $this->addTables( [ 'revision', 'page' ] );
 177                         $this->addJoinConds(
 178                                 [ 'page' => [ 'JOIN', [ 'page_id = rev_page' ] ] ]
 179                         );
 180                         $this->addFields( [
 181                                 'rev_id' => $idField, 'rev_timestamp' => $tsField, 'rev_page' => $pageField
 182                         ] );
 183                 }
 184
 185                 if ( $this->fld_tags ) {
 186                         $this->addFields( [ 'ts_tags' => ChangeTags::makeTagSummarySubquery( 'revision' ) ] );
 187                 }
 188
 189                 if ( $params['tag'] !== null ) {
 190                         $this->addTables( 'change_tag' );
 191                         $this->addJoinConds(
 192                                 [ 'change_tag' => [ 'JOIN', [ 'rev_id=ct_rev_id' ] ] ]
 193                         );
 194                         $changeTagDefStore = MediaWikiServices::getInstance()->getChangeTagDefStore();
 195                         try {
 196                                 $this->addWhereFld( 'ct_tag_id', $changeTagDefStore->getId( $params['tag'] ) );
 197                         } catch ( NameTableAccessException $exception ) {
 198                                 // Return nothing.
 199                                 $this->addWhere( '1=0' );
 200                         }
 201                 }
 202
 203                 if ( $resultPageSet === null && $this->fetchContent ) {
 204                         // For each page we will request, the user must have read rights for that page
 205                         $status = Status::newGood();
 206                         $user = $this->getUser();
 207
 208                         /** @var Title $title */
 209                         foreach ( $pageSet->getGoodTitles() as $title ) {
 210                                 if ( !$this->getPermissionManager()->userCan( 'read', $user, $title ) ) {
 211                                         $status->fatal( ApiMessage::create(
 212                                                 [ 'apierror-cannotviewtitle', wfEscapeWikiText( $title->getPrefixedText() ) ],
 213                                                 'accessdenied'
 214                                         ) );
 215                                 }
 216                         }
 217                         if ( !$status->isGood() ) {
 218                                 $this->dieStatus( $status );
 219                         }
 220                 }
 221
 222                 if ( $enumRevMode ) {
 223                         // Indexes targeted:
 224                         //  page_timestamp if we don't have rvuser
 225                         //  page_actor_timestamp (on revision_actor_temp) if we have rvuser in READ_NEW mode
 226                         //  page_user_timestamp if we have a logged-in rvuser
 227                         //  page_timestamp or usertext_timestamp if we have an IP rvuser
 228
 229                         // This is mostly to prevent parameter errors (and optimize SQL?)
 230                         $this->requireMaxOneParameter( $params, 'startid', 'start' );
 231                         $this->requireMaxOneParameter( $params, 'endid', 'end' );
 232                         $this->requireMaxOneParameter( $params, 'user', 'excludeuser' );
 233
 234                         if ( $params['continue'] !== null ) {
 235                                 $cont = explode( '|', $params['continue'] );
 236                                 $this->dieContinueUsageIf( count( $cont ) != 2 );
 237                                 $op = ( $params['dir'] === 'newer' ? '>' : '<' );
 238                                 $continueTimestamp = $db->addQuotes( $db->timestamp( $cont[0] ) );
 239                                 $continueId = (int)$cont[1];
 240                                 $this->dieContinueUsageIf( $continueId != $cont[1] );
 241                                 $this->addWhere( "$tsField $op $continueTimestamp OR " .
 242                                         "($tsField = $continueTimestamp AND " .
 243                                         "$idField $op= $continueId)"
 244                                 );
 245                         }
 246
 247                         // Convert startid/endid to timestamps (T163532)
 248                         $revids = [];
 249                         if ( $params['startid'] !== null ) {
 250                                 $revids[] = (int)$params['startid'];
 251                         }
 252                         if ( $params['endid'] !== null ) {
 253                                 $revids[] = (int)$params['endid'];
 254                         }
 255                         if ( $revids ) {
 256                                 $db = $this->getDB();
 257                                 $sql = $db->unionQueries( [
 258                                         $db->selectSQLText(
 259                                                 'revision',
 260                                                 [ 'id' => 'rev_id', 'ts' => 'rev_timestamp' ],
 261                                                 [ 'rev_id' => $revids ],
 262                                                 __METHOD__
 263                                         ),
 264                                         $db->selectSQLText(
 265                                                 'archive',
 266                                                 [ 'id' => 'ar_rev_id', 'ts' => 'ar_timestamp' ],
 267                                                 [ 'ar_rev_id' => $revids ],
 268                                                 __METHOD__
 269                                         ),
 270                                 ], $db::UNION_DISTINCT );
 271                                 $res = $db->query( $sql, __METHOD__ );
 272                                 foreach ( $res as $row ) {
 273                                         if ( (int)$row->id === (int)$params['startid'] ) {
 274                                                 $params['start'] = $row->ts;
 275                                         }
 276                                         if ( (int)$row->id === (int)$params['endid'] ) {
 277                                                 $params['end'] = $row->ts;
 278                                         }
 279                                 }
 280                                 if ( $params['startid'] !== null && $params['start'] === null ) {
 281                                         $p = $this->encodeParamName( 'startid' );
 282                                         $this->dieWithError( [ 'apierror-revisions-badid', $p ], "badid_$p" );
 283                                 }
 284                                 if ( $params['endid'] !== null && $params['end'] === null ) {
 285                                         $p = $this->encodeParamName( 'endid' );
 286                                         $this->dieWithError( [ 'apierror-revisions-badid', $p ], "badid_$p" );
 287                                 }
 288
 289                                 if ( $params['start'] !== null ) {
 290                                         $op = ( $params['dir'] === 'newer' ? '>' : '<' );
 291                                         $ts = $db->addQuotes( $db->timestampOrNull( $params['start'] ) );
 292                                         if ( $params['startid'] !== null ) {
 293                                                 $this->addWhere( "$tsField $op $ts OR "
 294                                                         . "$tsField = $ts AND $idField $op= " . (int)$params['startid'] );
 295                                         } else {
 296                                                 $this->addWhere( "$tsField $op= $ts" );
 297                                         }
 298                                 }
 299                                 if ( $params['end'] !== null ) {
 300                                         $op = ( $params['dir'] === 'newer' ? '<' : '>' ); // Yes, opposite of the above
 301                                         $ts = $db->addQuotes( $db->timestampOrNull( $params['end'] ) );
 302                                         if ( $params['endid'] !== null ) {
 303                                                 $this->addWhere( "$tsField $op $ts OR "
 304                                                         . "$tsField = $ts AND $idField $op= " . (int)$params['endid'] );
 305                                         } else {
 306                                                 $this->addWhere( "$tsField $op= $ts" );
 307                                         }
 308                                 }
 309                         } else {
 310                                 $this->addTimestampWhereRange( $tsField, $params['dir'],
 311                                         $params['start'], $params['end'] );
 312                         }
 313
 314                         $sort = ( $params['dir'] === 'newer' ? '' : 'DESC' );
 315                         $this->addOption( 'ORDER BY', [ "rev_timestamp $sort", "rev_id $sort" ] );
 316
 317                         // There is only one ID, use it
 318                         $ids = array_keys( $pageSet->getGoodTitles() );
 319                         $this->addWhereFld( $pageField, reset( $ids ) );
 320
 321                         if ( $params['user'] !== null ) {
 322                                 $actorQuery = ActorMigration::newMigration()
 323                                         ->getWhere( $db, 'rev_user', User::newFromName( $params['user'], false ) );
 324                                 $this->addTables( $actorQuery['tables'] );
 325                                 $this->addJoinConds( $actorQuery['joins'] );
 326                                 $this->addWhere( $actorQuery['conds'] );
 327                         } elseif ( $params['excludeuser'] !== null ) {
 328                                 $actorQuery = ActorMigration::newMigration()
 329                                         ->getWhere( $db, 'rev_user', User::newFromName( $params['excludeuser'], false ) );
 330                                 $this->addTables( $actorQuery['tables'] );
 331                                 $this->addJoinConds( $actorQuery['joins'] );
 332                                 $this->addWhere( 'NOT(' . $actorQuery['conds'] . ')' );
 333                         }
 334                         if ( $params['user'] !== null || $params['excludeuser'] !== null ) {
 335                                 // Paranoia: avoid brute force searches (T19342)
 336                                 if ( !$this->getPermissionManager()->userHasRight( $this->getUser(), 'deletedhistory' ) ) {
 337                                         $bitmask = RevisionRecord::DELETED_USER;
 338                                 } elseif ( !$this->getUser()->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 339                                         $bitmask = RevisionRecord::DELETED_USER | RevisionRecord::DELETED_RESTRICTED;
 340                                 } else {
 341                                         $bitmask = 0;
 342                                 }
 343                                 if ( $bitmask ) {
 344                                         $this->addWhere( $db->bitAnd( 'rev_deleted', $bitmask ) . " != $bitmask" );
 345                                 }
 346                         }
 347                 } elseif ( $revCount > 0 ) {
 348                         // Always targets the PRIMARY index
 349
 350                         $revs = $pageSet->getLiveRevisionIDs();
 351
 352                         // Get all revision IDs
 353                         $this->addWhereFld( 'rev_id', array_keys( $revs ) );
 354
 355                         if ( $params['continue'] !== null ) {
 356                                 $this->addWhere( 'rev_id >= ' . (int)$params['continue'] );
 357                         }
 358                         $this->addOption( 'ORDER BY', 'rev_id' );
 359                 } elseif ( $pageCount > 0 ) {
 360                         // Always targets the rev_page_id index
 361
 362                         $titles = $pageSet->getGoodTitles();
 363
 364                         // When working in multi-page non-enumeration mode,
 365                         // limit to the latest revision only
 366                         $this->addWhere( 'page_latest=rev_id' );
 367
 368                         // Get all page IDs
 369                         $this->addWhereFld( 'page_id', array_keys( $titles ) );
 370                         // Every time someone relies on equality propagation, god kills a kitten :)
 371                         $this->addWhereFld( 'rev_page', array_keys( $titles ) );
 372
 373                         if ( $params['continue'] !== null ) {
 374                                 $cont = explode( '|', $params['continue'] );
 375                                 $this->dieContinueUsageIf( count( $cont ) != 2 );
 376                                 $pageid = (int)$cont[0];
 377                                 $revid = (int)$cont[1];
 378                                 $this->addWhere(
 379                                         "rev_page > $pageid OR " .
 380                                         "(rev_page = $pageid AND " .
 381                                         "rev_id >= $revid)"
 382                                 );
 383                         }
 384                         $this->addOption( 'ORDER BY', [
 385                                 'rev_page',
 386                                 'rev_id'
 387                         ] );
 388                 } else {
 389                         ApiBase::dieDebug( __METHOD__, 'param validation?' );
 390                 }
 391
 392                 $this->addOption( 'LIMIT', $this->limit + 1 );
 393
 394                 // T224017: `rev_timestamp` is never the correct index to use for this module, but
 395                 // MariaDB (10.1.37-39) sometimes insists on trying to use it anyway. Tell it not to.
 396                 $this->addOption( 'IGNORE INDEX', [ 'revision' => 'rev_timestamp' ] );
 397
 398                 $count = 0;
 399                 $generated = [];
 400                 $hookData = [];
 401                 $res = $this->select( __METHOD__, [], $hookData );
 402
 403                 foreach ( $res as $row ) {
 404                         if ( ++$count > $this->limit ) {
 405                                 // We've reached the one extra which shows that there are
 406                                 // additional pages to be had. Stop here...
 407                                 if ( $enumRevMode ) {
 408                                         $this->setContinueEnumParameter( 'continue',
 409                                                 $row->rev_timestamp . '|' . (int)$row->rev_id );
 410                                 } elseif ( $revCount > 0 ) {
 411                                         $this->setContinueEnumParameter( 'continue', (int)$row->rev_id );
 412                                 } else {
 413                                         $this->setContinueEnumParameter( 'continue', (int)$row->rev_page .
 414                                                 '|' . (int)$row->rev_id );
 415                                 }
 416                                 break;
 417                         }
 418
 419                         if ( $resultPageSet !== null ) {
 420                                 $generated[] = $row->rev_id;
 421                         } else {
 422                                 $revision = $revisionStore->newRevisionFromRow( $row );
 423                                 $rev = $this->extractRevisionInfo( $revision, $row );
 424
 425                                 if ( $this->token !== null ) {
 426                                         $title = Title::newFromLinkTarget( $revision->getPageAsLinkTarget() );
 427                                         $revisionCompat = new Revision( $revision );
 428                                         $tokenFunctions = $this->getTokenFunctions();
 429                                         foreach ( $this->token as $t ) {
 430                                                 $val = call_user_func( $tokenFunctions[$t], $title->getArticleID(), $title, $revisionCompat );
 431                                                 if ( $val === false ) {
 432                                                         $this->addWarning( [ 'apiwarn-tokennotallowed', $t ] );
 433                                                 } else {
 434                                                         $rev[$t . 'token'] = $val;
 435                                                 }
 436                                         }
 437                                 }
 438
 439                                 $fit = $this->processRow( $row, $rev, $hookData ) &&
 440                                         $this->addPageSubItem( $row->rev_page, $rev, 'rev' );
 441                                 if ( !$fit ) {
 442                                         if ( $enumRevMode ) {
 443                                                 $this->setContinueEnumParameter( 'continue',
 444                                                         $row->rev_timestamp . '|' . (int)$row->rev_id );
 445                                         } elseif ( $revCount > 0 ) {
 446                                                 $this->setContinueEnumParameter( 'continue', (int)$row->rev_id );
 447                                         } else {
 448                                                 $this->setContinueEnumParameter( 'continue', (int)$row->rev_page .
 449                                                         '|' . (int)$row->rev_id );
 450                                         }
 451                                         break;
 452                                 }
 453                         }
 454                 }
 455
 456                 if ( $resultPageSet !== null ) {
 457                         $resultPageSet->populateFromRevisionIDs( $generated );
 458                 }
 459         }
 460
 461         public function getCacheMode( $params ) {
 462                 if ( isset( $params['token'] ) ) {
 463                         return 'private';
 464                 }
 465                 return parent::getCacheMode( $params );
 466         }
 467
 468         public function getAllowedParams() {
 469                 $ret = parent::getAllowedParams() + [
 470                         'startid' => [
 471                                 ApiBase::PARAM_TYPE => 'integer',
 472                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 473                         ],
 474                         'endid' => [
 475                                 ApiBase::PARAM_TYPE => 'integer',
 476                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 477                         ],
 478                         'start' => [
 479                                 ApiBase::PARAM_TYPE => 'timestamp',
 480                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 481                         ],
 482                         'end' => [
 483                                 ApiBase::PARAM_TYPE => 'timestamp',
 484                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 485                         ],
 486                         'dir' => [
 487                                 ApiBase::PARAM_DFLT => 'older',
 488                                 ApiBase::PARAM_TYPE => [
 489                                         'newer',
 490                                         'older'
 491                                 ],
 492                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
 493                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 494                         ],
 495                         'user' => [
 496                                 ApiBase::PARAM_TYPE => 'user',
 497                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 498                         ],
 499                         'excludeuser' => [
 500                                 ApiBase::PARAM_TYPE => 'user',
 501                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'singlepageonly' ] ],
 502                         ],
 503                         'tag' => null,
 504                         'token' => [
 505                                 ApiBase::PARAM_DEPRECATED => true,
 506                                 ApiBase::PARAM_TYPE => array_keys( $this->getTokenFunctions() ),
 507                                 ApiBase::PARAM_ISMULTI => true
 508                         ],
 509                         'continue' => [
 510                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
 511                         ],
 512                 ];
 513
 514                 $ret['limit'][ApiBase::PARAM_HELP_MSG_INFO] = [ [ 'singlepageonly' ] ];
 515
 516                 return $ret;
 517         }
 518
 519         protected function getExamplesMessages() {
 520                 return [
 521                         'action=query&prop=revisions&titles=API|Main%20Page&' .
 522                                 'rvslots=*&rvprop=timestamp|user|comment|content'
 523                                 => 'apihelp-query+revisions-example-content',
 524                         'action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 525                                 'rvprop=timestamp|user|comment'
 526                                 => 'apihelp-query+revisions-example-last5',
 527                         'action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 528                                 'rvprop=timestamp|user|comment&rvdir=newer'
 529                                 => 'apihelp-query+revisions-example-first5',
 530                         'action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 531                                 'rvprop=timestamp|user|comment&rvdir=newer&rvstart=2006-05-01T00:00:00Z'
 532                                 => 'apihelp-query+revisions-example-first5-after',
 533                         'action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 534                                 'rvprop=timestamp|user|comment&rvexcludeuser=127.0.0.1'
 535                                 => 'apihelp-query+revisions-example-first5-not-localhost',
 536                         'action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 537                                 'rvprop=timestamp|user|comment&rvuser=MediaWiki%20default'
 538                                 => 'apihelp-query+revisions-example-first5-user',
 539                 ];
 540         }
 541
 542         public function getHelpUrls() {
 543                 return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Revisions';
 544         }
 545 }