includes/api/ApiQueryDeletedrevs.php

   1 <?php
   2 /**
   3  * Copyright © 2007 Roan Kattouw "<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\Storage\NameTableAccessException;
  25
  26 /**
  27  * Query module to enumerate all deleted revisions.
  28  *
  29  * @ingroup API
  30  * @deprecated since 1.25
  31  */
  32 class ApiQueryDeletedrevs extends ApiQueryBase {
  33
  34         public function __construct( ApiQuery $query, $moduleName ) {
  35                 parent::__construct( $query, $moduleName, 'dr' );
  36         }
  37
  38         public function execute() {
  39                 // Before doing anything at all, let's check permissions
  40                 $this->checkUserRightsAny( 'deletedhistory' );
  41
  42                 $this->addDeprecation( 'apiwarn-deprecation-deletedrevs', 'action=query&list=deletedrevs' );
  43
  44                 $user = $this->getUser();
  45                 $db = $this->getDB();
  46                 $commentStore = CommentStore::getStore();
  47                 $params = $this->extractRequestParams( false );
  48                 $prop = array_flip( $params['prop'] );
  49                 $fld_parentid = isset( $prop['parentid'] );
  50                 $fld_revid = isset( $prop['revid'] );
  51                 $fld_user = isset( $prop['user'] );
  52                 $fld_userid = isset( $prop['userid'] );
  53                 $fld_comment = isset( $prop['comment'] );
  54                 $fld_parsedcomment = isset( $prop['parsedcomment'] );
  55                 $fld_minor = isset( $prop['minor'] );
  56                 $fld_len = isset( $prop['len'] );
  57                 $fld_sha1 = isset( $prop['sha1'] );
  58                 $fld_content = isset( $prop['content'] );
  59                 $fld_token = isset( $prop['token'] );
  60                 $fld_tags = isset( $prop['tags'] );
  61
  62                 if ( isset( $prop['token'] ) ) {
  63                         $p = $this->getModulePrefix();
  64                 }
  65
  66                 // If we're in a mode that breaks the same-origin policy, no tokens can
  67                 // be obtained
  68                 if ( $this->lacksSameOriginSecurity() ) {
  69                         $fld_token = false;
  70                 }
  71
  72                 // If user can't undelete, no tokens
  73                 if ( !$user->isAllowed( 'undelete' ) ) {
  74                         $fld_token = false;
  75                 }
  76
  77                 $result = $this->getResult();
  78                 $pageSet = $this->getPageSet();
  79                 $titles = $pageSet->getTitles();
  80
  81                 // This module operates in three modes:
  82                 // 'revs': List deleted revs for certain titles (1)
  83                 // 'user': List deleted revs by a certain user (2)
  84                 // 'all': List all deleted revs in NS (3)
  85                 $mode = 'all';
  86                 if ( count( $titles ) > 0 ) {
  87                         $mode = 'revs';
  88                 } elseif ( !is_null( $params['user'] ) ) {
  89                         $mode = 'user';
  90                 }
  91
  92                 if ( $mode == 'revs' || $mode == 'user' ) {
  93                         // Ignore namespace and unique due to inability to know whether they were purposely set
  94                         foreach ( [ 'from', 'to', 'prefix', /*'namespace', 'unique'*/ ] as $p ) {
  95                                 if ( !is_null( $params[$p] ) ) {
  96                                         $this->dieWithError( [ 'apierror-deletedrevs-param-not-1-2', $p ], 'badparams' );
  97                                 }
  98                         }
  99                 } else {
 100                         foreach ( [ 'start', 'end' ] as $p ) {
 101                                 if ( !is_null( $params[$p] ) ) {
 102                                         $this->dieWithError( [ 'apierror-deletedrevs-param-not-3', $p ], 'badparams' );
 103                                 }
 104                         }
 105                 }
 106
 107                 if ( !is_null( $params['user'] ) && !is_null( $params['excludeuser'] ) ) {
 108                         $this->dieWithError( 'user and excludeuser cannot be used together', 'badparams' );
 109                 }
 110
 111                 $this->addTables( 'archive' );
 112                 $this->addFields( [ 'ar_title', 'ar_namespace', 'ar_timestamp', 'ar_deleted', 'ar_id' ] );
 113
 114                 $this->addFieldsIf( 'ar_parent_id', $fld_parentid );
 115                 $this->addFieldsIf( 'ar_rev_id', $fld_revid );
 116                 if ( $fld_user || $fld_userid ) {
 117                         $actorQuery = ActorMigration::newMigration()->getJoin( 'ar_user' );
 118                         $this->addTables( $actorQuery['tables'] );
 119                         $this->addFields( $actorQuery['fields'] );
 120                         $this->addJoinConds( $actorQuery['joins'] );
 121                 }
 122                 $this->addFieldsIf( 'ar_minor_edit', $fld_minor );
 123                 $this->addFieldsIf( 'ar_len', $fld_len );
 124                 $this->addFieldsIf( 'ar_sha1', $fld_sha1 );
 125
 126                 if ( $fld_comment || $fld_parsedcomment ) {
 127                         $commentQuery = $commentStore->getJoin( 'ar_comment' );
 128                         $this->addTables( $commentQuery['tables'] );
 129                         $this->addFields( $commentQuery['fields'] );
 130                         $this->addJoinConds( $commentQuery['joins'] );
 131                 }
 132
 133                 if ( $fld_tags ) {
 134                         $this->addTables( 'tag_summary' );
 135                         $this->addJoinConds(
 136                                 [ 'tag_summary' => [ 'LEFT JOIN', [ 'ar_rev_id=ts_rev_id' ] ] ]
 137                         );
 138                         $this->addFields( 'ts_tags' );
 139                 }
 140
 141                 if ( !is_null( $params['tag'] ) ) {
 142                         $this->addTables( 'change_tag' );
 143                         $this->addJoinConds(
 144                                 [ 'change_tag' => [ 'INNER JOIN', [ 'ar_rev_id=ct_rev_id' ] ] ]
 145                         );
 146                         $changeTagDefStore = MediaWikiServices::getInstance()->getChangeTagDefStore();
 147                         try {
 148                                 $this->addWhereFld( 'ct_tag_id', $changeTagDefStore->getId( $params['tag'] ) );
 149                         } catch ( NameTableAccessException $exception ) {
 150                                 // Return nothing.
 151                                 $this->addWhere( '1=0' );
 152                         }
 153                 }
 154
 155                 if ( $fld_content ) {
 156                         $this->addTables( 'text' );
 157                         $this->addJoinConds(
 158                                 [ 'text' => [ 'LEFT JOIN', [ 'ar_text_id=old_id' ] ] ]
 159                         );
 160                         $this->addFields( [ 'ar_text_id', 'old_text', 'old_flags' ] );
 161
 162                         // This also means stricter restrictions
 163                         $this->checkUserRightsAny( [ 'deletedtext', 'undelete' ] );
 164                 }
 165                 // Check limits
 166                 $userMax = $fld_content ? ApiBase::LIMIT_SML1 : ApiBase::LIMIT_BIG1;
 167                 $botMax = $fld_content ? ApiBase::LIMIT_SML2 : ApiBase::LIMIT_BIG2;
 168
 169                 $limit = $params['limit'];
 170
 171                 if ( $limit == 'max' ) {
 172                         $limit = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 173                         $this->getResult()->addParsedLimit( $this->getModuleName(), $limit );
 174                 }
 175
 176                 $this->validateLimit( 'limit', $limit, 1, $userMax, $botMax );
 177
 178                 if ( $fld_token ) {
 179                         // Undelete tokens are identical for all pages, so we cache one here
 180                         $token = $user->getEditToken( '', $this->getMain()->getRequest() );
 181                 }
 182
 183                 $dir = $params['dir'];
 184
 185                 // We need a custom WHERE clause that matches all titles.
 186                 if ( $mode == 'revs' ) {
 187                         $lb = new LinkBatch( $titles );
 188                         $where = $lb->constructSet( 'ar', $db );
 189                         $this->addWhere( $where );
 190                 } elseif ( $mode == 'all' ) {
 191                         $this->addWhereFld( 'ar_namespace', $params['namespace'] );
 192
 193                         $from = $params['from'] === null
 194                                 ? null
 195                                 : $this->titlePartToKey( $params['from'], $params['namespace'] );
 196                         $to = $params['to'] === null
 197                                 ? null
 198                                 : $this->titlePartToKey( $params['to'], $params['namespace'] );
 199                         $this->addWhereRange( 'ar_title', $dir, $from, $to );
 200
 201                         if ( isset( $params['prefix'] ) ) {
 202                                 $this->addWhere( 'ar_title' . $db->buildLike(
 203                                         $this->titlePartToKey( $params['prefix'], $params['namespace'] ),
 204                                         $db->anyString() ) );
 205                         }
 206                 }
 207
 208                 if ( !is_null( $params['user'] ) ) {
 209                         // Don't query by user ID here, it might be able to use the ar_usertext_timestamp index.
 210                         $actorQuery = ActorMigration::newMigration()
 211                                 ->getWhere( $db, 'ar_user', User::newFromName( $params['user'], false ), false );
 212                         $this->addTables( $actorQuery['tables'] );
 213                         $this->addJoinConds( $actorQuery['joins'] );
 214                         $this->addWhere( $actorQuery['conds'] );
 215                 } elseif ( !is_null( $params['excludeuser'] ) ) {
 216                         // Here there's no chance of using ar_usertext_timestamp.
 217                         $actorQuery = ActorMigration::newMigration()
 218                                 ->getWhere( $db, 'ar_user', User::newFromName( $params['excludeuser'], false ) );
 219                         $this->addTables( $actorQuery['tables'] );
 220                         $this->addJoinConds( $actorQuery['joins'] );
 221                         $this->addWhere( 'NOT(' . $actorQuery['conds'] . ')' );
 222                 }
 223
 224                 if ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ) {
 225                         // Paranoia: avoid brute force searches (T19342)
 226                         // (shouldn't be able to get here without 'deletedhistory', but
 227                         // check it again just in case)
 228                         if ( !$user->isAllowed( 'deletedhistory' ) ) {
 229                                 $bitmask = Revision::DELETED_USER;
 230                         } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 231                                 $bitmask = Revision::DELETED_USER | Revision::DELETED_RESTRICTED;
 232                         } else {
 233                                 $bitmask = 0;
 234                         }
 235                         if ( $bitmask ) {
 236                                 $this->addWhere( $db->bitAnd( 'ar_deleted', $bitmask ) . " != $bitmask" );
 237                         }
 238                 }
 239
 240                 if ( !is_null( $params['continue'] ) ) {
 241                         $cont = explode( '|', $params['continue'] );
 242                         $op = ( $dir == 'newer' ? '>' : '<' );
 243                         if ( $mode == 'all' || $mode == 'revs' ) {
 244                                 $this->dieContinueUsageIf( count( $cont ) != 4 );
 245                                 $ns = intval( $cont[0] );
 246                                 $this->dieContinueUsageIf( strval( $ns ) !== $cont[0] );
 247                                 $title = $db->addQuotes( $cont[1] );
 248                                 $ts = $db->addQuotes( $db->timestamp( $cont[2] ) );
 249                                 $ar_id = (int)$cont[3];
 250                                 $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[3] );
 251                                 $this->addWhere( "ar_namespace $op $ns OR " .
 252                                         "(ar_namespace = $ns AND " .
 253                                         "(ar_title $op $title OR " .
 254                                         "(ar_title = $title AND " .
 255                                         "(ar_timestamp $op $ts OR " .
 256                                         "(ar_timestamp = $ts AND " .
 257                                         "ar_id $op= $ar_id)))))" );
 258                         } else {
 259                                 $this->dieContinueUsageIf( count( $cont ) != 2 );
 260                                 $ts = $db->addQuotes( $db->timestamp( $cont[0] ) );
 261                                 $ar_id = (int)$cont[1];
 262                                 $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[1] );
 263                                 $this->addWhere( "ar_timestamp $op $ts OR " .
 264                                         "(ar_timestamp = $ts AND " .
 265                                         "ar_id $op= $ar_id)" );
 266                         }
 267                 }
 268
 269                 $this->addOption( 'LIMIT', $limit + 1 );
 270                 if ( $mode == 'all' ) {
 271                         if ( $params['unique'] ) {
 272                                 // @todo Does this work on non-MySQL?
 273                                 $this->addOption( 'GROUP BY', 'ar_title' );
 274                         } else {
 275                                 $sort = ( $dir == 'newer' ? '' : ' DESC' );
 276                                 $this->addOption( 'ORDER BY', [
 277                                         'ar_title' . $sort,
 278                                         'ar_timestamp' . $sort,
 279                                         'ar_id' . $sort,
 280                                 ] );
 281                         }
 282                 } else {
 283                         if ( $mode == 'revs' ) {
 284                                 // Sort by ns and title in the same order as timestamp for efficiency
 285                                 $this->addWhereRange( 'ar_namespace', $dir, null, null );
 286                                 $this->addWhereRange( 'ar_title', $dir, null, null );
 287                         }
 288                         $this->addTimestampWhereRange( 'ar_timestamp', $dir, $params['start'], $params['end'] );
 289                         // Include in ORDER BY for uniqueness
 290                         $this->addWhereRange( 'ar_id', $dir, null, null );
 291                 }
 292                 $res = $this->select( __METHOD__ );
 293                 $pageMap = []; // Maps ns&title to (fake) pageid
 294                 $count = 0;
 295                 $newPageID = 0;
 296                 foreach ( $res as $row ) {
 297                         if ( ++$count > $limit ) {
 298                                 // We've had enough
 299                                 if ( $mode == 'all' || $mode == 'revs' ) {
 300                                         $this->setContinueEnumParameter( 'continue',
 301                                                 "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
 302                                         );
 303                                 } else {
 304                                         $this->setContinueEnumParameter( 'continue', "$row->ar_timestamp|$row->ar_id" );
 305                                 }
 306                                 break;
 307                         }
 308
 309                         $rev = [];
 310                         $anyHidden = false;
 311
 312                         $rev['timestamp'] = wfTimestamp( TS_ISO_8601, $row->ar_timestamp );
 313                         if ( $fld_revid ) {
 314                                 $rev['revid'] = intval( $row->ar_rev_id );
 315                         }
 316                         if ( $fld_parentid && !is_null( $row->ar_parent_id ) ) {
 317                                 $rev['parentid'] = intval( $row->ar_parent_id );
 318                         }
 319                         if ( $fld_user || $fld_userid ) {
 320                                 if ( $row->ar_deleted & Revision::DELETED_USER ) {
 321                                         $rev['userhidden'] = true;
 322                                         $anyHidden = true;
 323                                 }
 324                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_USER, $user ) ) {
 325                                         if ( $fld_user ) {
 326                                                 $rev['user'] = $row->ar_user_text;
 327                                         }
 328                                         if ( $fld_userid ) {
 329                                                 $rev['userid'] = (int)$row->ar_user;
 330                                         }
 331                                 }
 332                         }
 333
 334                         if ( $fld_comment || $fld_parsedcomment ) {
 335                                 if ( $row->ar_deleted & Revision::DELETED_COMMENT ) {
 336                                         $rev['commenthidden'] = true;
 337                                         $anyHidden = true;
 338                                 }
 339                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_COMMENT, $user ) ) {
 340                                         $comment = $commentStore->getComment( 'ar_comment', $row )->text;
 341                                         if ( $fld_comment ) {
 342                                                 $rev['comment'] = $comment;
 343                                         }
 344                                         if ( $fld_parsedcomment ) {
 345                                                 $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 346                                                 $rev['parsedcomment'] = Linker::formatComment( $comment, $title );
 347                                         }
 348                                 }
 349                         }
 350
 351                         if ( $fld_minor ) {
 352                                 $rev['minor'] = $row->ar_minor_edit == 1;
 353                         }
 354                         if ( $fld_len ) {
 355                                 $rev['len'] = $row->ar_len;
 356                         }
 357                         if ( $fld_sha1 ) {
 358                                 if ( $row->ar_deleted & Revision::DELETED_TEXT ) {
 359                                         $rev['sha1hidden'] = true;
 360                                         $anyHidden = true;
 361                                 }
 362                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_TEXT, $user ) ) {
 363                                         if ( $row->ar_sha1 != '' ) {
 364                                                 $rev['sha1'] = Wikimedia\base_convert( $row->ar_sha1, 36, 16, 40 );
 365                                         } else {
 366                                                 $rev['sha1'] = '';
 367                                         }
 368                                 }
 369                         }
 370                         if ( $fld_content ) {
 371                                 if ( $row->ar_deleted & Revision::DELETED_TEXT ) {
 372                                         $rev['texthidden'] = true;
 373                                         $anyHidden = true;
 374                                 }
 375                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_TEXT, $user ) ) {
 376                                         ApiResult::setContentValue( $rev, 'text', Revision::getRevisionText( $row ) );
 377                                 }
 378                         }
 379
 380                         if ( $fld_tags ) {
 381                                 if ( $row->ts_tags ) {
 382                                         $tags = explode( ',', $row->ts_tags );
 383                                         ApiResult::setIndexedTagName( $tags, 'tag' );
 384                                         $rev['tags'] = $tags;
 385                                 } else {
 386                                         $rev['tags'] = [];
 387                                 }
 388                         }
 389
 390                         if ( $anyHidden && ( $row->ar_deleted & Revision::DELETED_RESTRICTED ) ) {
 391                                 $rev['suppressed'] = true;
 392                         }
 393
 394                         if ( !isset( $pageMap[$row->ar_namespace][$row->ar_title] ) ) {
 395                                 $pageID = $newPageID++;
 396                                 $pageMap[$row->ar_namespace][$row->ar_title] = $pageID;
 397                                 $a['revisions'] = [ $rev ];
 398                                 ApiResult::setIndexedTagName( $a['revisions'], 'rev' );
 399                                 $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 400                                 ApiQueryBase::addTitleInfo( $a, $title );
 401                                 if ( $fld_token ) {
 402                                         $a['token'] = $token;
 403                                 }
 404                                 $fit = $result->addValue( [ 'query', $this->getModuleName() ], $pageID, $a );
 405                         } else {
 406                                 $pageID = $pageMap[$row->ar_namespace][$row->ar_title];
 407                                 $fit = $result->addValue(
 408                                         [ 'query', $this->getModuleName(), $pageID, 'revisions' ],
 409                                         null, $rev );
 410                         }
 411                         if ( !$fit ) {
 412                                 if ( $mode == 'all' || $mode == 'revs' ) {
 413                                         $this->setContinueEnumParameter( 'continue',
 414                                                 "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
 415                                         );
 416                                 } else {
 417                                         $this->setContinueEnumParameter( 'continue', "$row->ar_timestamp|$row->ar_id" );
 418                                 }
 419                                 break;
 420                         }
 421                 }
 422                 $result->addIndexedTagName( [ 'query', $this->getModuleName() ], 'page' );
 423         }
 424
 425         public function isDeprecated() {
 426                 return true;
 427         }
 428
 429         public function getAllowedParams() {
 430                 return [
 431                         'start' => [
 432                                 ApiBase::PARAM_TYPE => 'timestamp',
 433                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 1, 2 ] ],
 434                         ],
 435                         'end' => [
 436                                 ApiBase::PARAM_TYPE => 'timestamp',
 437                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 1, 2 ] ],
 438                         ],
 439                         'dir' => [
 440                                 ApiBase::PARAM_TYPE => [
 441                                         'newer',
 442                                         'older'
 443                                 ],
 444                                 ApiBase::PARAM_DFLT => 'older',
 445                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
 446                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 1, 3 ] ],
 447                         ],
 448                         'from' => [
 449                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 3 ] ],
 450                         ],
 451                         'to' => [
 452                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 3 ] ],
 453                         ],
 454                         'prefix' => [
 455                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 3 ] ],
 456                         ],
 457                         'unique' => [
 458                                 ApiBase::PARAM_DFLT => false,
 459                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 3 ] ],
 460                         ],
 461                         'namespace' => [
 462                                 ApiBase::PARAM_TYPE => 'namespace',
 463                                 ApiBase::PARAM_DFLT => NS_MAIN,
 464                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 3 ] ],
 465                         ],
 466                         'tag' => null,
 467                         'user' => [
 468                                 ApiBase::PARAM_TYPE => 'user'
 469                         ],
 470                         'excludeuser' => [
 471                                 ApiBase::PARAM_TYPE => 'user'
 472                         ],
 473                         'prop' => [
 474                                 ApiBase::PARAM_DFLT => 'user|comment',
 475                                 ApiBase::PARAM_TYPE => [
 476                                         'revid',
 477                                         'parentid',
 478                                         'user',
 479                                         'userid',
 480                                         'comment',
 481                                         'parsedcomment',
 482                                         'minor',
 483                                         'len',
 484                                         'sha1',
 485                                         'content',
 486                                         'token',
 487                                         'tags'
 488                                 ],
 489                                 ApiBase::PARAM_ISMULTI => true
 490                         ],
 491                         'limit' => [
 492                                 ApiBase::PARAM_DFLT => 10,
 493                                 ApiBase::PARAM_TYPE => 'limit',
 494                                 ApiBase::PARAM_MIN => 1,
 495                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 496                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 497                         ],
 498                         'continue' => [
 499                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
 500                         ],
 501                 ];
 502         }
 503
 504         protected function getExamplesMessages() {
 505                 return [
 506                         'action=query&list=deletedrevs&titles=Main%20Page|Talk:Main%20Page&' .
 507                                 'drprop=user|comment|content'
 508                                 => 'apihelp-query+deletedrevs-example-mode1',
 509                         'action=query&list=deletedrevs&druser=Bob&drlimit=50'
 510                                 => 'apihelp-query+deletedrevs-example-mode2',
 511                         'action=query&list=deletedrevs&drdir=newer&drlimit=50'
 512                                 => 'apihelp-query+deletedrevs-example-mode3-main',
 513                         'action=query&list=deletedrevs&drdir=newer&drlimit=50&drnamespace=1&drunique='
 514                                 => 'apihelp-query+deletedrevs-example-mode3-talk',
 515                 ];
 516         }
 517
 518         public function getHelpUrls() {
 519                 return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Deletedrevs';
 520         }
 521 }