includes/api/ApiQueryDeletedrevs.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on Jul 2, 2007
   6  *
   7  * Copyright © 2007 Roan Kattouw "<Firstname>.<Lastname>@gmail.com"
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  */
  26
  27 /**
  28  * Query module to enumerate all deleted revisions.
  29  *
  30  * @ingroup API
  31  * @deprecated since 1.25
  32  */
  33 class ApiQueryDeletedrevs extends ApiQueryBase {
  34
  35         public function __construct( ApiQuery $query, $moduleName ) {
  36                 parent::__construct( $query, $moduleName, 'dr' );
  37         }
  38
  39         public function execute() {
  40                 $user = $this->getUser();
  41                 // Before doing anything at all, let's check permissions
  42                 if ( !$user->isAllowed( 'deletedhistory' ) ) {
  43                         $this->dieUsage(
  44                                 'You don\'t have permission to view deleted revision information',
  45                                 'permissiondenied'
  46                         );
  47                 }
  48
  49                 $this->setWarning(
  50                         'list=deletedrevs has been deprecated. Please use prop=deletedrevisions or ' .
  51                         'list=alldeletedrevisions instead.'
  52                 );
  53                 $this->logFeatureUsage( 'action=query&list=deletedrevs' );
  54
  55                 $db = $this->getDB();
  56                 $params = $this->extractRequestParams( false );
  57                 $prop = array_flip( $params['prop'] );
  58                 $fld_parentid = isset( $prop['parentid'] );
  59                 $fld_revid = isset( $prop['revid'] );
  60                 $fld_user = isset( $prop['user'] );
  61                 $fld_userid = isset( $prop['userid'] );
  62                 $fld_comment = isset( $prop['comment'] );
  63                 $fld_parsedcomment = isset( $prop['parsedcomment'] );
  64                 $fld_minor = isset( $prop['minor'] );
  65                 $fld_len = isset( $prop['len'] );
  66                 $fld_sha1 = isset( $prop['sha1'] );
  67                 $fld_content = isset( $prop['content'] );
  68                 $fld_token = isset( $prop['token'] );
  69                 $fld_tags = isset( $prop['tags'] );
  70
  71                 if ( isset( $prop['token'] ) ) {
  72                         $p = $this->getModulePrefix();
  73                         $this->setWarning(
  74                                 "{$p}prop=token has been deprecated. Please use action=query&meta=tokens instead."
  75                         );
  76                 }
  77
  78                 // If we're in a mode that breaks the same-origin policy, no tokens can
  79                 // be obtained
  80                 if ( $this->lacksSameOriginSecurity() ) {
  81                         $fld_token = false;
  82                 }
  83
  84                 // If user can't undelete, no tokens
  85                 if ( !$user->isAllowed( 'undelete' ) ) {
  86                         $fld_token = false;
  87                 }
  88
  89                 $result = $this->getResult();
  90                 $pageSet = $this->getPageSet();
  91                 $titles = $pageSet->getTitles();
  92
  93                 // This module operates in three modes:
  94                 // 'revs': List deleted revs for certain titles (1)
  95                 // 'user': List deleted revs by a certain user (2)
  96                 // 'all': List all deleted revs in NS (3)
  97                 $mode = 'all';
  98                 if ( count( $titles ) > 0 ) {
  99                         $mode = 'revs';
 100                 } elseif ( !is_null( $params['user'] ) ) {
 101                         $mode = 'user';
 102                 }
 103
 104                 if ( $mode == 'revs' || $mode == 'user' ) {
 105                         // Ignore namespace and unique due to inability to know whether they were purposely set
 106                         foreach ( [ 'from', 'to', 'prefix', /*'namespace', 'unique'*/ ] as $p ) {
 107                                 if ( !is_null( $params[$p] ) ) {
 108                                         $this->dieUsage( "The '{$p}' parameter cannot be used in modes 1 or 2", 'badparams' );
 109                                 }
 110                         }
 111                 } else {
 112                         foreach ( [ 'start', 'end' ] as $p ) {
 113                                 if ( !is_null( $params[$p] ) ) {
 114                                         $this->dieUsage( "The {$p} parameter cannot be used in mode 3", 'badparams' );
 115                                 }
 116                         }
 117                 }
 118
 119                 if ( !is_null( $params['user'] ) && !is_null( $params['excludeuser'] ) ) {
 120                         $this->dieUsage( 'user and excludeuser cannot be used together', 'badparams' );
 121                 }
 122
 123                 $this->addTables( 'archive' );
 124                 $this->addFields( [ 'ar_title', 'ar_namespace', 'ar_timestamp', 'ar_deleted', 'ar_id' ] );
 125
 126                 $this->addFieldsIf( 'ar_parent_id', $fld_parentid );
 127                 $this->addFieldsIf( 'ar_rev_id', $fld_revid );
 128                 $this->addFieldsIf( 'ar_user_text', $fld_user );
 129                 $this->addFieldsIf( 'ar_user', $fld_userid );
 130                 $this->addFieldsIf( 'ar_comment', $fld_comment || $fld_parsedcomment );
 131                 $this->addFieldsIf( 'ar_minor_edit', $fld_minor );
 132                 $this->addFieldsIf( 'ar_len', $fld_len );
 133                 $this->addFieldsIf( 'ar_sha1', $fld_sha1 );
 134
 135                 if ( $fld_tags ) {
 136                         $this->addTables( 'tag_summary' );
 137                         $this->addJoinConds(
 138                                 [ 'tag_summary' => [ 'LEFT JOIN', [ 'ar_rev_id=ts_rev_id' ] ] ]
 139                         );
 140                         $this->addFields( 'ts_tags' );
 141                 }
 142
 143                 if ( !is_null( $params['tag'] ) ) {
 144                         $this->addTables( 'change_tag' );
 145                         $this->addJoinConds(
 146                                 [ 'change_tag' => [ 'INNER JOIN', [ 'ar_rev_id=ct_rev_id' ] ] ]
 147                         );
 148                         $this->addWhereFld( 'ct_tag', $params['tag'] );
 149                 }
 150
 151                 if ( $fld_content ) {
 152                         // Modern MediaWiki has the content for deleted revs in the 'text'
 153                         // table using fields old_text and old_flags. But revisions deleted
 154                         // pre-1.5 store the content in the 'archive' table directly using
 155                         // fields ar_text and ar_flags, and no corresponding 'text' row. So
 156                         // we have to LEFT JOIN and fetch all four fields, plus ar_text_id
 157                         // to be able to tell the difference.
 158                         $this->addTables( 'text' );
 159                         $this->addJoinConds(
 160                                 [ 'text' => [ 'LEFT JOIN', [ 'ar_text_id=old_id' ] ] ]
 161                         );
 162                         $this->addFields( [ 'ar_text', 'ar_flags', 'ar_text_id', 'old_text', 'old_flags' ] );
 163
 164                         // This also means stricter restrictions
 165                         if ( !$user->isAllowedAny( 'undelete', 'deletedtext' ) ) {
 166                                 $this->dieUsage(
 167                                         'You don\'t have permission to view deleted revision content',
 168                                         'permissiondenied'
 169                                 );
 170                         }
 171                 }
 172                 // Check limits
 173                 $userMax = $fld_content ? ApiBase::LIMIT_SML1 : ApiBase::LIMIT_BIG1;
 174                 $botMax = $fld_content ? ApiBase::LIMIT_SML2 : ApiBase::LIMIT_BIG2;
 175
 176                 $limit = $params['limit'];
 177
 178                 if ( $limit == 'max' ) {
 179                         $limit = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 180                         $this->getResult()->addParsedLimit( $this->getModuleName(), $limit );
 181                 }
 182
 183                 $this->validateLimit( 'limit', $limit, 1, $userMax, $botMax );
 184
 185                 if ( $fld_token ) {
 186                         // Undelete tokens are identical for all pages, so we cache one here
 187                         $token = $user->getEditToken( '', $this->getMain()->getRequest() );
 188                 }
 189
 190                 $dir = $params['dir'];
 191
 192                 // We need a custom WHERE clause that matches all titles.
 193                 if ( $mode == 'revs' ) {
 194                         $lb = new LinkBatch( $titles );
 195                         $where = $lb->constructSet( 'ar', $db );
 196                         $this->addWhere( $where );
 197                 } elseif ( $mode == 'all' ) {
 198                         $this->addWhereFld( 'ar_namespace', $params['namespace'] );
 199
 200                         $from = $params['from'] === null
 201                                 ? null
 202                                 : $this->titlePartToKey( $params['from'], $params['namespace'] );
 203                         $to = $params['to'] === null
 204                                 ? null
 205                                 : $this->titlePartToKey( $params['to'], $params['namespace'] );
 206                         $this->addWhereRange( 'ar_title', $dir, $from, $to );
 207
 208                         if ( isset( $params['prefix'] ) ) {
 209                                 $this->addWhere( 'ar_title' . $db->buildLike(
 210                                         $this->titlePartToKey( $params['prefix'], $params['namespace'] ),
 211                                         $db->anyString() ) );
 212                         }
 213                 }
 214
 215                 if ( !is_null( $params['user'] ) ) {
 216                         $this->addWhereFld( 'ar_user_text', $params['user'] );
 217                 } elseif ( !is_null( $params['excludeuser'] ) ) {
 218                         $this->addWhere( 'ar_user_text != ' .
 219                                 $db->addQuotes( $params['excludeuser'] ) );
 220                 }
 221
 222                 if ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ) {
 223                         // Paranoia: avoid brute force searches (bug 17342)
 224                         // (shouldn't be able to get here without 'deletedhistory', but
 225                         // check it again just in case)
 226                         if ( !$user->isAllowed( 'deletedhistory' ) ) {
 227                                 $bitmask = Revision::DELETED_USER;
 228                         } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 229                                 $bitmask = Revision::DELETED_USER | Revision::DELETED_RESTRICTED;
 230                         } else {
 231                                 $bitmask = 0;
 232                         }
 233                         if ( $bitmask ) {
 234                                 $this->addWhere( $db->bitAnd( 'ar_deleted', $bitmask ) . " != $bitmask" );
 235                         }
 236                 }
 237
 238                 if ( !is_null( $params['continue'] ) ) {
 239                         $cont = explode( '|', $params['continue'] );
 240                         $op = ( $dir == 'newer' ? '>' : '<' );
 241                         if ( $mode == 'all' || $mode == 'revs' ) {
 242                                 $this->dieContinueUsageIf( count( $cont ) != 4 );
 243                                 $ns = intval( $cont[0] );
 244                                 $this->dieContinueUsageIf( strval( $ns ) !== $cont[0] );
 245                                 $title = $db->addQuotes( $cont[1] );
 246                                 $ts = $db->addQuotes( $db->timestamp( $cont[2] ) );
 247                                 $ar_id = (int)$cont[3];
 248                                 $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[3] );
 249                                 $this->addWhere( "ar_namespace $op $ns OR " .
 250                                         "(ar_namespace = $ns AND " .
 251                                         "(ar_title $op $title OR " .
 252                                         "(ar_title = $title AND " .
 253                                         "(ar_timestamp $op $ts OR " .
 254                                         "(ar_timestamp = $ts AND " .
 255                                         "ar_id $op= $ar_id)))))" );
 256                         } else {
 257                                 $this->dieContinueUsageIf( count( $cont ) != 2 );
 258                                 $ts = $db->addQuotes( $db->timestamp( $cont[0] ) );
 259                                 $ar_id = (int)$cont[1];
 260                                 $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[1] );
 261                                 $this->addWhere( "ar_timestamp $op $ts OR " .
 262                                         "(ar_timestamp = $ts AND " .
 263                                         "ar_id $op= $ar_id)" );
 264                         }
 265                 }
 266
 267                 $this->addOption( 'LIMIT', $limit + 1 );
 268                 $this->addOption(
 269                         'USE INDEX',
 270                         [ 'archive' => ( $mode == 'user' ? 'usertext_timestamp' : 'name_title_timestamp' ) ]
 271                 );
 272                 if ( $mode == 'all' ) {
 273                         if ( $params['unique'] ) {
 274                                 // @todo Does this work on non-MySQL?
 275                                 $this->addOption( 'GROUP BY', 'ar_title' );
 276                         } else {
 277                                 $sort = ( $dir == 'newer' ? '' : ' DESC' );
 278                                 $this->addOption( 'ORDER BY', [
 279                                         'ar_title' . $sort,
 280                                         'ar_timestamp' . $sort,
 281                                         'ar_id' . $sort,
 282                                 ] );
 283                         }
 284                 } else {
 285                         if ( $mode == 'revs' ) {
 286                                 // Sort by ns and title in the same order as timestamp for efficiency
 287                                 $this->addWhereRange( 'ar_namespace', $dir, null, null );
 288                                 $this->addWhereRange( 'ar_title', $dir, null, null );
 289                         }
 290                         $this->addTimestampWhereRange( 'ar_timestamp', $dir, $params['start'], $params['end'] );
 291                         // Include in ORDER BY for uniqueness
 292                         $this->addWhereRange( 'ar_id', $dir, null, null );
 293                 }
 294                 $res = $this->select( __METHOD__ );
 295                 $pageMap = []; // Maps ns&title to (fake) pageid
 296                 $count = 0;
 297                 $newPageID = 0;
 298                 foreach ( $res as $row ) {
 299                         if ( ++$count > $limit ) {
 300                                 // We've had enough
 301                                 if ( $mode == 'all' || $mode == 'revs' ) {
 302                                         $this->setContinueEnumParameter( 'continue',
 303                                                 "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
 304                                         );
 305                                 } else {
 306                                         $this->setContinueEnumParameter( 'continue', "$row->ar_timestamp|$row->ar_id" );
 307                                 }
 308                                 break;
 309                         }
 310
 311                         $rev = [];
 312                         $anyHidden = false;
 313
 314                         $rev['timestamp'] = wfTimestamp( TS_ISO_8601, $row->ar_timestamp );
 315                         if ( $fld_revid ) {
 316                                 $rev['revid'] = intval( $row->ar_rev_id );
 317                         }
 318                         if ( $fld_parentid && !is_null( $row->ar_parent_id ) ) {
 319                                 $rev['parentid'] = intval( $row->ar_parent_id );
 320                         }
 321                         if ( $fld_user || $fld_userid ) {
 322                                 if ( $row->ar_deleted & Revision::DELETED_USER ) {
 323                                         $rev['userhidden'] = true;
 324                                         $anyHidden = true;
 325                                 }
 326                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_USER, $user ) ) {
 327                                         if ( $fld_user ) {
 328                                                 $rev['user'] = $row->ar_user_text;
 329                                         }
 330                                         if ( $fld_userid ) {
 331                                                 $rev['userid'] = (int)$row->ar_user;
 332                                         }
 333                                 }
 334                         }
 335
 336                         if ( $fld_comment || $fld_parsedcomment ) {
 337                                 if ( $row->ar_deleted & Revision::DELETED_COMMENT ) {
 338                                         $rev['commenthidden'] = true;
 339                                         $anyHidden = true;
 340                                 }
 341                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_COMMENT, $user ) ) {
 342                                         if ( $fld_comment ) {
 343                                                 $rev['comment'] = $row->ar_comment;
 344                                         }
 345                                         if ( $fld_parsedcomment ) {
 346                                                 $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 347                                                 $rev['parsedcomment'] = Linker::formatComment( $row->ar_comment, $title );
 348                                         }
 349                                 }
 350                         }
 351
 352                         if ( $fld_minor ) {
 353                                 $rev['minor'] = $row->ar_minor_edit == 1;
 354                         }
 355                         if ( $fld_len ) {
 356                                 $rev['len'] = $row->ar_len;
 357                         }
 358                         if ( $fld_sha1 ) {
 359                                 if ( $row->ar_deleted & Revision::DELETED_TEXT ) {
 360                                         $rev['sha1hidden'] = true;
 361                                         $anyHidden = true;
 362                                 }
 363                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_TEXT, $user ) ) {
 364                                         if ( $row->ar_sha1 != '' ) {
 365                                                 $rev['sha1'] = Wikimedia\base_convert( $row->ar_sha1, 36, 16, 40 );
 366                                         } else {
 367                                                 $rev['sha1'] = '';
 368                                         }
 369                                 }
 370                         }
 371                         if ( $fld_content ) {
 372                                 if ( $row->ar_deleted & Revision::DELETED_TEXT ) {
 373                                         $rev['texthidden'] = true;
 374                                         $anyHidden = true;
 375                                 }
 376                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_TEXT, $user ) ) {
 377                                         if ( isset( $row->ar_text ) && !$row->ar_text_id ) {
 378                                                 // Pre-1.5 ar_text row (if condition from Revision::newFromArchiveRow)
 379                                                 ApiResult::setContentValue( $rev, 'text', Revision::getRevisionText( $row, 'ar_' ) );
 380                                         } else {
 381                                                 ApiResult::setContentValue( $rev, 'text', Revision::getRevisionText( $row ) );
 382                                         }
 383                                 }
 384                         }
 385
 386                         if ( $fld_tags ) {
 387                                 if ( $row->ts_tags ) {
 388                                         $tags = explode( ',', $row->ts_tags );
 389                                         ApiResult::setIndexedTagName( $tags, 'tag' );
 390                                         $rev['tags'] = $tags;
 391                                 } else {
 392                                         $rev['tags'] = [];
 393                                 }
 394                         }
 395
 396                         if ( $anyHidden && ( $row->ar_deleted & Revision::DELETED_RESTRICTED ) ) {
 397                                 $rev['suppressed'] = true;
 398                         }
 399
 400                         if ( !isset( $pageMap[$row->ar_namespace][$row->ar_title] ) ) {
 401                                 $pageID = $newPageID++;
 402                                 $pageMap[$row->ar_namespace][$row->ar_title] = $pageID;
 403                                 $a['revisions'] = [ $rev ];
 404                                 ApiResult::setIndexedTagName( $a['revisions'], 'rev' );
 405                                 $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 406                                 ApiQueryBase::addTitleInfo( $a, $title );
 407                                 if ( $fld_token ) {
 408                                         $a['token'] = $token;
 409                                 }
 410                                 $fit = $result->addValue( [ 'query', $this->getModuleName() ], $pageID, $a );
 411                         } else {
 412                                 $pageID = $pageMap[$row->ar_namespace][$row->ar_title];
 413                                 $fit = $result->addValue(
 414                                         [ 'query', $this->getModuleName(), $pageID, 'revisions' ],
 415                                         null, $rev );
 416                         }
 417                         if ( !$fit ) {
 418                                 if ( $mode == 'all' || $mode == 'revs' ) {
 419                                         $this->setContinueEnumParameter( 'continue',
 420                                                 "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
 421                                         );
 422                                 } else {
 423                                         $this->setContinueEnumParameter( 'continue', "$row->ar_timestamp|$row->ar_id" );
 424                                 }
 425                                 break;
 426                         }
 427                 }
 428                 $result->addIndexedTagName( [ 'query', $this->getModuleName() ], 'page' );
 429         }
 430
 431         public function isDeprecated() {
 432                 return true;
 433         }
 434
 435         public function getAllowedParams() {
 436                 return [
 437                         'start' => [
 438                                 ApiBase::PARAM_TYPE => 'timestamp',
 439                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 1, 2 ] ],
 440                         ],
 441                         'end' => [
 442                                 ApiBase::PARAM_TYPE => 'timestamp',
 443                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 1, 2 ] ],
 444                         ],
 445                         'dir' => [
 446                                 ApiBase::PARAM_TYPE => [
 447                                         'newer',
 448                                         'older'
 449                                 ],
 450                                 ApiBase::PARAM_DFLT => 'older',
 451                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
 452                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 1, 3 ] ],
 453                         ],
 454                         'from' => [
 455                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 3 ] ],
 456                         ],
 457                         'to' => [
 458                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 3 ] ],
 459                         ],
 460                         'prefix' => [
 461                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 3 ] ],
 462                         ],
 463                         'unique' => [
 464                                 ApiBase::PARAM_DFLT => false,
 465                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 3 ] ],
 466                         ],
 467                         'namespace' => [
 468                                 ApiBase::PARAM_TYPE => 'namespace',
 469                                 ApiBase::PARAM_DFLT => NS_MAIN,
 470                                 ApiBase::PARAM_HELP_MSG_INFO => [ [ 'modes', 3 ] ],
 471                         ],
 472                         'tag' => null,
 473                         'user' => [
 474                                 ApiBase::PARAM_TYPE => 'user'
 475                         ],
 476                         'excludeuser' => [
 477                                 ApiBase::PARAM_TYPE => 'user'
 478                         ],
 479                         'prop' => [
 480                                 ApiBase::PARAM_DFLT => 'user|comment',
 481                                 ApiBase::PARAM_TYPE => [
 482                                         'revid',
 483                                         'parentid',
 484                                         'user',
 485                                         'userid',
 486                                         'comment',
 487                                         'parsedcomment',
 488                                         'minor',
 489                                         'len',
 490                                         'sha1',
 491                                         'content',
 492                                         'token',
 493                                         'tags'
 494                                 ],
 495                                 ApiBase::PARAM_ISMULTI => true
 496                         ],
 497                         'limit' => [
 498                                 ApiBase::PARAM_DFLT => 10,
 499                                 ApiBase::PARAM_TYPE => 'limit',
 500                                 ApiBase::PARAM_MIN => 1,
 501                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 502                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 503                         ],
 504                         'continue' => [
 505                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
 506                         ],
 507                 ];
 508         }
 509
 510         protected function getExamplesMessages() {
 511                 return [
 512                         'action=query&list=deletedrevs&titles=Main%20Page|Talk:Main%20Page&' .
 513                                 'drprop=user|comment|content'
 514                                 => 'apihelp-query+deletedrevs-example-mode1',
 515                         'action=query&list=deletedrevs&druser=Bob&drlimit=50'
 516                                 => 'apihelp-query+deletedrevs-example-mode2',
 517                         'action=query&list=deletedrevs&drdir=newer&drlimit=50'
 518                                 => 'apihelp-query+deletedrevs-example-mode3-main',
 519                         'action=query&list=deletedrevs&drdir=newer&drlimit=50&drnamespace=1&drunique='
 520                                 => 'apihelp-query+deletedrevs-example-mode3-talk',
 521                 ];
 522         }
 523
 524         public function getHelpUrls() {
 525                 return 'https://www.mediawiki.org/wiki/API:Deletedrevs';
 526         }
 527 }