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 JSON callback mode, no tokens can be obtained
  79                 if ( !is_null( $this->getMain()->getRequest()->getVal( 'callback' ) ) ) {
  80                         $fld_token = false;
  81                 }
  82
  83                 // If user can't undelete, no tokens
  84                 if ( !$user->isAllowed( 'undelete' ) ) {
  85                         $fld_token = false;
  86                 }
  87
  88                 $result = $this->getResult();
  89                 $pageSet = $this->getPageSet();
  90                 $titles = $pageSet->getTitles();
  91
  92                 // This module operates in three modes:
  93                 // 'revs': List deleted revs for certain titles (1)
  94                 // 'user': List deleted revs by a certain user (2)
  95                 // 'all': List all deleted revs in NS (3)
  96                 $mode = 'all';
  97                 if ( count( $titles ) > 0 ) {
  98                         $mode = 'revs';
  99                 } elseif ( !is_null( $params['user'] ) ) {
 100                         $mode = 'user';
 101                 }
 102
 103                 if ( $mode == 'revs' || $mode == 'user' ) {
 104                         // Ignore namespace and unique due to inability to know whether they were purposely set
 105                         foreach ( array( 'from', 'to', 'prefix', /*'namespace', 'unique'*/ ) as $p ) {
 106                                 if ( !is_null( $params[$p] ) ) {
 107                                         $this->dieUsage( "The '{$p}' parameter cannot be used in modes 1 or 2", 'badparams' );
 108                                 }
 109                         }
 110                 } else {
 111                         foreach ( array( 'start', 'end' ) as $p ) {
 112                                 if ( !is_null( $params[$p] ) ) {
 113                                         $this->dieUsage( "The {$p} parameter cannot be used in mode 3", 'badparams' );
 114                                 }
 115                         }
 116                 }
 117
 118                 if ( !is_null( $params['user'] ) && !is_null( $params['excludeuser'] ) ) {
 119                         $this->dieUsage( 'user and excludeuser cannot be used together', 'badparams' );
 120                 }
 121
 122                 $this->addTables( 'archive' );
 123                 $this->addFields( array( 'ar_title', 'ar_namespace', 'ar_timestamp', 'ar_deleted', 'ar_id' ) );
 124
 125                 $this->addFieldsIf( 'ar_parent_id', $fld_parentid );
 126                 $this->addFieldsIf( 'ar_rev_id', $fld_revid );
 127                 $this->addFieldsIf( 'ar_user_text', $fld_user );
 128                 $this->addFieldsIf( 'ar_user', $fld_userid );
 129                 $this->addFieldsIf( 'ar_comment', $fld_comment || $fld_parsedcomment );
 130                 $this->addFieldsIf( 'ar_minor_edit', $fld_minor );
 131                 $this->addFieldsIf( 'ar_len', $fld_len );
 132                 $this->addFieldsIf( 'ar_sha1', $fld_sha1 );
 133
 134                 if ( $fld_tags ) {
 135                         $this->addTables( 'tag_summary' );
 136                         $this->addJoinConds(
 137                                 array( 'tag_summary' => array( 'LEFT JOIN', array( 'ar_rev_id=ts_rev_id' ) ) )
 138                         );
 139                         $this->addFields( 'ts_tags' );
 140                 }
 141
 142                 if ( !is_null( $params['tag'] ) ) {
 143                         $this->addTables( 'change_tag' );
 144                         $this->addJoinConds(
 145                                 array( 'change_tag' => array( 'INNER JOIN', array( 'ar_rev_id=ct_rev_id' ) ) )
 146                         );
 147                         $this->addWhereFld( 'ct_tag', $params['tag'] );
 148                 }
 149
 150                 if ( $fld_content ) {
 151                         // Modern MediaWiki has the content for deleted revs in the 'text'
 152                         // table using fields old_text and old_flags. But revisions deleted
 153                         // pre-1.5 store the content in the 'archive' table directly using
 154                         // fields ar_text and ar_flags, and no corresponding 'text' row. So
 155                         // we have to LEFT JOIN and fetch all four fields, plus ar_text_id
 156                         // to be able to tell the difference.
 157                         $this->addTables( 'text' );
 158                         $this->addJoinConds(
 159                                 array( 'text' => array( 'LEFT JOIN', array( 'ar_text_id=old_id' ) ) )
 160                         );
 161                         $this->addFields( array( 'ar_text', 'ar_flags', 'ar_text_id', 'old_text', 'old_flags' ) );
 162
 163                         // This also means stricter restrictions
 164                         if ( !$user->isAllowedAny( 'undelete', 'deletedtext' ) ) {
 165                                 $this->dieUsage(
 166                                         'You don\'t have permission to view deleted revision content',
 167                                         'permissiondenied'
 168                                 );
 169                         }
 170                 }
 171                 // Check limits
 172                 $userMax = $fld_content ? ApiBase::LIMIT_SML1 : ApiBase::LIMIT_BIG1;
 173                 $botMax = $fld_content ? ApiBase::LIMIT_SML2 : ApiBase::LIMIT_BIG2;
 174
 175                 $limit = $params['limit'];
 176
 177                 if ( $limit == 'max' ) {
 178                         $limit = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 179                         $this->getResult()->setParsedLimit( $this->getModuleName(), $limit );
 180                 }
 181
 182                 $this->validateLimit( 'limit', $limit, 1, $userMax, $botMax );
 183
 184                 if ( $fld_token ) {
 185                         // Undelete tokens are identical for all pages, so we cache one here
 186                         $token = $user->getEditToken( '', $this->getMain()->getRequest() );
 187                 }
 188
 189                 $dir = $params['dir'];
 190
 191                 // We need a custom WHERE clause that matches all titles.
 192                 if ( $mode == 'revs' ) {
 193                         $lb = new LinkBatch( $titles );
 194                         $where = $lb->constructSet( 'ar', $db );
 195                         $this->addWhere( $where );
 196                 } elseif ( $mode == 'all' ) {
 197                         $this->addWhereFld( 'ar_namespace', $params['namespace'] );
 198
 199                         $from = $params['from'] === null
 200                                 ? null
 201                                 : $this->titlePartToKey( $params['from'], $params['namespace'] );
 202                         $to = $params['to'] === null
 203                                 ? null
 204                                 : $this->titlePartToKey( $params['to'], $params['namespace'] );
 205                         $this->addWhereRange( 'ar_title', $dir, $from, $to );
 206
 207                         if ( isset( $params['prefix'] ) ) {
 208                                 $this->addWhere( 'ar_title' . $db->buildLike(
 209                                         $this->titlePartToKey( $params['prefix'], $params['namespace'] ),
 210                                         $db->anyString() ) );
 211                         }
 212                 }
 213
 214                 if ( !is_null( $params['user'] ) ) {
 215                         $this->addWhereFld( 'ar_user_text', $params['user'] );
 216                 } elseif ( !is_null( $params['excludeuser'] ) ) {
 217                         $this->addWhere( 'ar_user_text != ' .
 218                                 $db->addQuotes( $params['excludeuser'] ) );
 219                 }
 220
 221                 if ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ) {
 222                         // Paranoia: avoid brute force searches (bug 17342)
 223                         // (shouldn't be able to get here without 'deletedhistory', but
 224                         // check it again just in case)
 225                         if ( !$user->isAllowed( 'deletedhistory' ) ) {
 226                                 $bitmask = Revision::DELETED_USER;
 227                         } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 228                                 $bitmask = Revision::DELETED_USER | Revision::DELETED_RESTRICTED;
 229                         } else {
 230                                 $bitmask = 0;
 231                         }
 232                         if ( $bitmask ) {
 233                                 $this->addWhere( $db->bitAnd( 'ar_deleted', $bitmask ) . " != $bitmask" );
 234                         }
 235                 }
 236
 237                 if ( !is_null( $params['continue'] ) ) {
 238                         $cont = explode( '|', $params['continue'] );
 239                         $op = ( $dir == 'newer' ? '>' : '<' );
 240                         if ( $mode == 'all' || $mode == 'revs' ) {
 241                                 $this->dieContinueUsageIf( count( $cont ) != 4 );
 242                                 $ns = intval( $cont[0] );
 243                                 $this->dieContinueUsageIf( strval( $ns ) !== $cont[0] );
 244                                 $title = $db->addQuotes( $cont[1] );
 245                                 $ts = $db->addQuotes( $db->timestamp( $cont[2] ) );
 246                                 $ar_id = (int)$cont[3];
 247                                 $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[3] );
 248                                 $this->addWhere( "ar_namespace $op $ns OR " .
 249                                         "(ar_namespace = $ns AND " .
 250                                         "(ar_title $op $title OR " .
 251                                         "(ar_title = $title AND " .
 252                                         "(ar_timestamp $op $ts OR " .
 253                                         "(ar_timestamp = $ts AND " .
 254                                         "ar_id $op= $ar_id)))))" );
 255                         } else {
 256                                 $this->dieContinueUsageIf( count( $cont ) != 2 );
 257                                 $ts = $db->addQuotes( $db->timestamp( $cont[0] ) );
 258                                 $ar_id = (int)$cont[1];
 259                                 $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[1] );
 260                                 $this->addWhere( "ar_timestamp $op $ts OR " .
 261                                         "(ar_timestamp = $ts AND " .
 262                                         "ar_id $op= $ar_id)" );
 263                         }
 264                 }
 265
 266                 $this->addOption( 'LIMIT', $limit + 1 );
 267                 $this->addOption(
 268                         'USE INDEX',
 269                         array( 'archive' => ( $mode == 'user' ? 'usertext_timestamp' : 'name_title_timestamp' ) )
 270                 );
 271                 if ( $mode == 'all' ) {
 272                         if ( $params['unique'] ) {
 273                                 // @todo Does this work on non-MySQL?
 274                                 $this->addOption( 'GROUP BY', 'ar_title' );
 275                         } else {
 276                                 $sort = ( $dir == 'newer' ? '' : ' DESC' );
 277                                 $this->addOption( 'ORDER BY', array(
 278                                         'ar_title' . $sort,
 279                                         'ar_timestamp' . $sort,
 280                                         'ar_id' . $sort,
 281                                 ) );
 282                         }
 283                 } else {
 284                         if ( $mode == 'revs' ) {
 285                                 // Sort by ns and title in the same order as timestamp for efficiency
 286                                 $this->addWhereRange( 'ar_namespace', $dir, null, null );
 287                                 $this->addWhereRange( 'ar_title', $dir, null, null );
 288                         }
 289                         $this->addTimestampWhereRange( 'ar_timestamp', $dir, $params['start'], $params['end'] );
 290                         // Include in ORDER BY for uniqueness
 291                         $this->addWhereRange( 'ar_id', $dir, null, null );
 292                 }
 293                 $res = $this->select( __METHOD__ );
 294                 $pageMap = array(); // Maps ns&title to (fake) pageid
 295                 $count = 0;
 296                 $newPageID = 0;
 297                 foreach ( $res as $row ) {
 298                         if ( ++$count > $limit ) {
 299                                 // We've had enough
 300                                 if ( $mode == 'all' || $mode == 'revs' ) {
 301                                         $this->setContinueEnumParameter( 'continue',
 302                                                 "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
 303                                         );
 304                                 } else {
 305                                         $this->setContinueEnumParameter( 'continue', "$row->ar_timestamp|$row->ar_id" );
 306                                 }
 307                                 break;
 308                         }
 309
 310                         $rev = array();
 311                         $anyHidden = false;
 312
 313                         $rev['timestamp'] = wfTimestamp( TS_ISO_8601, $row->ar_timestamp );
 314                         if ( $fld_revid ) {
 315                                 $rev['revid'] = intval( $row->ar_rev_id );
 316                         }
 317                         if ( $fld_parentid && !is_null( $row->ar_parent_id ) ) {
 318                                 $rev['parentid'] = intval( $row->ar_parent_id );
 319                         }
 320                         if ( $fld_user || $fld_userid ) {
 321                                 if ( $row->ar_deleted & Revision::DELETED_USER ) {
 322                                         $rev['userhidden'] = '';
 323                                         $anyHidden = true;
 324                                 }
 325                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_USER, $user ) ) {
 326                                         if ( $fld_user ) {
 327                                                 $rev['user'] = $row->ar_user_text;
 328                                         }
 329                                         if ( $fld_userid ) {
 330                                                 $rev['userid'] = $row->ar_user;
 331                                         }
 332                                 }
 333                         }
 334
 335                         if ( $fld_comment || $fld_parsedcomment ) {
 336                                 if ( $row->ar_deleted & Revision::DELETED_COMMENT ) {
 337                                         $rev['commenthidden'] = '';
 338                                         $anyHidden = true;
 339                                 }
 340                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_COMMENT, $user ) ) {
 341                                         if ( $fld_comment ) {
 342                                                 $rev['comment'] = $row->ar_comment;
 343                                         }
 344                                         if ( $fld_parsedcomment ) {
 345                                                 $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 346                                                 $rev['parsedcomment'] = Linker::formatComment( $row->ar_comment, $title );
 347                                         }
 348                                 }
 349                         }
 350
 351                         if ( $fld_minor && $row->ar_minor_edit == 1 ) {
 352                                 $rev['minor'] = '';
 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'] = '';
 360                                         $anyHidden = true;
 361                                 }
 362                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_TEXT, $user ) ) {
 363                                         if ( $row->ar_sha1 != '' ) {
 364                                                 $rev['sha1'] = wfBaseConvert( $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'] = '';
 373                                         $anyHidden = true;
 374                                 }
 375                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_TEXT, $user ) ) {
 376                                         if ( isset( $row->ar_text ) && !$row->ar_text_id ) {
 377                                                 // Pre-1.5 ar_text row (if condition from Revision::newFromArchiveRow)
 378                                                 ApiResult::setContent( $rev, Revision::getRevisionText( $row, 'ar_' ) );
 379                                         } else {
 380                                                 ApiResult::setContent( $rev, Revision::getRevisionText( $row ) );
 381                                         }
 382                                 }
 383                         }
 384
 385                         if ( $fld_tags ) {
 386                                 if ( $row->ts_tags ) {
 387                                         $tags = explode( ',', $row->ts_tags );
 388                                         $this->getResult()->setIndexedTagName( $tags, 'tag' );
 389                                         $rev['tags'] = $tags;
 390                                 } else {
 391                                         $rev['tags'] = array();
 392                                 }
 393                         }
 394
 395                         if ( $anyHidden && ( $row->ar_deleted & Revision::DELETED_RESTRICTED ) ) {
 396                                 $rev['suppressed'] = '';
 397                         }
 398
 399                         if ( !isset( $pageMap[$row->ar_namespace][$row->ar_title] ) ) {
 400                                 $pageID = $newPageID++;
 401                                 $pageMap[$row->ar_namespace][$row->ar_title] = $pageID;
 402                                 $a['revisions'] = array( $rev );
 403                                 $result->setIndexedTagName( $a['revisions'], 'rev' );
 404                                 $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 405                                 ApiQueryBase::addTitleInfo( $a, $title );
 406                                 if ( $fld_token ) {
 407                                         $a['token'] = $token;
 408                                 }
 409                                 $fit = $result->addValue( array( 'query', $this->getModuleName() ), $pageID, $a );
 410                         } else {
 411                                 $pageID = $pageMap[$row->ar_namespace][$row->ar_title];
 412                                 $fit = $result->addValue(
 413                                         array( 'query', $this->getModuleName(), $pageID, 'revisions' ),
 414                                         null, $rev );
 415                         }
 416                         if ( !$fit ) {
 417                                 if ( $mode == 'all' || $mode == 'revs' ) {
 418                                         $this->setContinueEnumParameter( 'continue',
 419                                                 "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
 420                                         );
 421                                 } else {
 422                                         $this->setContinueEnumParameter( 'continue', "$row->ar_timestamp|$row->ar_id" );
 423                                 }
 424                                 break;
 425                         }
 426                 }
 427                 $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'page' );
 428         }
 429
 430         public function isDeprecated() {
 431                 return true;
 432         }
 433
 434         public function getAllowedParams() {
 435                 return array(
 436                         'start' => array(
 437                                 ApiBase::PARAM_TYPE => 'timestamp',
 438                                 ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 1, 2 ) ),
 439                         ),
 440                         'end' => array(
 441                                 ApiBase::PARAM_TYPE => 'timestamp',
 442                                 ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 1, 2 ) ),
 443                         ),
 444                         'dir' => array(
 445                                 ApiBase::PARAM_TYPE => array(
 446                                         'newer',
 447                                         'older'
 448                                 ),
 449                                 ApiBase::PARAM_DFLT => 'older',
 450                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
 451                                 ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 1, 3 ) ),
 452                         ),
 453                         'from' => array(
 454                                 ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 3 ) ),
 455                         ),
 456                         'to' => array(
 457                                 ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 3 ) ),
 458                         ),
 459                         'prefix' => array(
 460                                 ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 3 ) ),
 461                         ),
 462                         'unique' => array(
 463                                 ApiBase::PARAM_DFLT => false,
 464                                 ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 3 ) ),
 465                         ),
 466                         'namespace' => array(
 467                                 ApiBase::PARAM_TYPE => 'namespace',
 468                                 ApiBase::PARAM_DFLT => NS_MAIN,
 469                                 ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 3 ) ),
 470                         ),
 471                         'tag' => null,
 472                         'user' => array(
 473                                 ApiBase::PARAM_TYPE => 'user'
 474                         ),
 475                         'excludeuser' => array(
 476                                 ApiBase::PARAM_TYPE => 'user'
 477                         ),
 478                         'prop' => array(
 479                                 ApiBase::PARAM_DFLT => 'user|comment',
 480                                 ApiBase::PARAM_TYPE => array(
 481                                         'revid',
 482                                         'parentid',
 483                                         'user',
 484                                         'userid',
 485                                         'comment',
 486                                         'parsedcomment',
 487                                         'minor',
 488                                         'len',
 489                                         'sha1',
 490                                         'content',
 491                                         'token',
 492                                         'tags'
 493                                 ),
 494                                 ApiBase::PARAM_ISMULTI => true
 495                         ),
 496                         'limit' => array(
 497                                 ApiBase::PARAM_DFLT => 10,
 498                                 ApiBase::PARAM_TYPE => 'limit',
 499                                 ApiBase::PARAM_MIN => 1,
 500                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 501                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 502                         ),
 503                         'continue' => array(
 504                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
 505                         ),
 506                 );
 507         }
 508
 509         protected function getExamplesMessages() {
 510                 return array(
 511                         'action=query&list=deletedrevs&titles=Main%20Page|Talk:Main%20Page&' .
 512                                 'drprop=user|comment|content'
 513                                 => 'apihelp-query+deletedrevs-example-mode1',
 514                         'action=query&list=deletedrevs&druser=Bob&drlimit=50'
 515                                 => 'apihelp-query+deletedrevs-example-mode2',
 516                         'action=query&list=deletedrevs&drdir=newer&drlimit=50'
 517                                 => 'apihelp-query+deletedrevs-example-mode3-main',
 518                         'action=query&list=deletedrevs&drdir=newer&drlimit=50&drnamespace=1&drunique='
 519                                 => 'apihelp-query+deletedrevs-example-mode3-talk',
 520                 );
 521         }
 522
 523         public function getHelpUrls() {
 524                 return 'https://www.mediawiki.org/wiki/API:Deletedrevs';
 525         }
 526 }