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  */
  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                 $user = $this->getUser();
  40                 // Before doing anything at all, let's check permissions
  41                 if ( !$user->isAllowed( 'deletedhistory' ) ) {
  42                         $this->dieUsage(
  43                                 'You don\'t have permission to view deleted revision information',
  44                                 'permissiondenied'
  45                         );
  46                 }
  47
  48                 $db = $this->getDB();
  49                 $params = $this->extractRequestParams( false );
  50                 $prop = array_flip( $params['prop'] );
  51                 $fld_parentid = isset( $prop['parentid'] );
  52                 $fld_revid = isset( $prop['revid'] );
  53                 $fld_user = isset( $prop['user'] );
  54                 $fld_userid = isset( $prop['userid'] );
  55                 $fld_comment = isset( $prop['comment'] );
  56                 $fld_parsedcomment = isset( $prop['parsedcomment'] );
  57                 $fld_minor = isset( $prop['minor'] );
  58                 $fld_len = isset( $prop['len'] );
  59                 $fld_sha1 = isset( $prop['sha1'] );
  60                 $fld_content = isset( $prop['content'] );
  61                 $fld_token = isset( $prop['token'] );
  62                 $fld_tags = isset( $prop['tags'] );
  63
  64                 // If we're in JSON callback mode, no tokens can be obtained
  65                 if ( !is_null( $this->getMain()->getRequest()->getVal( 'callback' ) ) ) {
  66                         $fld_token = false;
  67                 }
  68
  69                 // If user can't undelete, no tokens
  70                 if ( !$user->isAllowed( 'undelete' ) ) {
  71                         $fld_token = false;
  72                 }
  73
  74                 $result = $this->getResult();
  75                 $pageSet = $this->getPageSet();
  76                 $titles = $pageSet->getTitles();
  77
  78                 // This module operates in three modes:
  79                 // 'revs': List deleted revs for certain titles (1)
  80                 // 'user': List deleted revs by a certain user (2)
  81                 // 'all': List all deleted revs in NS (3)
  82                 $mode = 'all';
  83                 if ( count( $titles ) > 0 ) {
  84                         $mode = 'revs';
  85                 } elseif ( !is_null( $params['user'] ) ) {
  86                         $mode = 'user';
  87                 }
  88
  89                 if ( $mode == 'revs' || $mode == 'user' ) {
  90                         // Ignore namespace and unique due to inability to know whether they were purposely set
  91                         foreach ( array( 'from', 'to', 'prefix', /*'namespace', 'unique'*/ ) as $p ) {
  92                                 if ( !is_null( $params[$p] ) ) {
  93                                         $this->dieUsage( "The '{$p}' parameter cannot be used in modes 1 or 2", 'badparams' );
  94                                 }
  95                         }
  96                 } else {
  97                         foreach ( array( 'start', 'end' ) as $p ) {
  98                                 if ( !is_null( $params[$p] ) ) {
  99                                         $this->dieUsage( "The {$p} parameter cannot be used in mode 3", 'badparams' );
 100                                 }
 101                         }
 102                 }
 103
 104                 if ( !is_null( $params['user'] ) && !is_null( $params['excludeuser'] ) ) {
 105                         $this->dieUsage( 'user and excludeuser cannot be used together', 'badparams' );
 106                 }
 107
 108                 $this->addTables( 'archive' );
 109                 $this->addFields( array( 'ar_title', 'ar_namespace', 'ar_timestamp', 'ar_deleted', 'ar_id' ) );
 110
 111                 $this->addFieldsIf( 'ar_parent_id', $fld_parentid );
 112                 $this->addFieldsIf( 'ar_rev_id', $fld_revid );
 113                 $this->addFieldsIf( 'ar_user_text', $fld_user );
 114                 $this->addFieldsIf( 'ar_user', $fld_userid );
 115                 $this->addFieldsIf( 'ar_comment', $fld_comment || $fld_parsedcomment );
 116                 $this->addFieldsIf( 'ar_minor_edit', $fld_minor );
 117                 $this->addFieldsIf( 'ar_len', $fld_len );
 118                 $this->addFieldsIf( 'ar_sha1', $fld_sha1 );
 119
 120                 if ( $fld_tags ) {
 121                         $this->addTables( 'tag_summary' );
 122                         $this->addJoinConds(
 123                                 array( 'tag_summary' => array( 'LEFT JOIN', array( 'ar_rev_id=ts_rev_id' ) ) )
 124                         );
 125                         $this->addFields( 'ts_tags' );
 126                 }
 127
 128                 if ( !is_null( $params['tag'] ) ) {
 129                         $this->addTables( 'change_tag' );
 130                         $this->addJoinConds(
 131                                 array( 'change_tag' => array( 'INNER JOIN', array( 'ar_rev_id=ct_rev_id' ) ) )
 132                         );
 133                         $this->addWhereFld( 'ct_tag', $params['tag'] );
 134                 }
 135
 136                 if ( $fld_content ) {
 137                         // Modern MediaWiki has the content for deleted revs in the 'text'
 138                         // table using fields old_text and old_flags. But revisions deleted
 139                         // pre-1.5 store the content in the 'archive' table directly using
 140                         // fields ar_text and ar_flags, and no corresponding 'text' row. So
 141                         // we have to LEFT JOIN and fetch all four fields, plus ar_text_id
 142                         // to be able to tell the difference.
 143                         $this->addTables( 'text' );
 144                         $this->addJoinConds(
 145                                 array( 'text' => array( 'LEFT JOIN', array( 'ar_text_id=old_id' ) ) )
 146                         );
 147                         $this->addFields( array( 'ar_text', 'ar_flags', 'ar_text_id', 'old_text', 'old_flags' ) );
 148
 149                         // This also means stricter restrictions
 150                         if ( !$user->isAllowedAny( 'undelete', 'deletedtext' ) ) {
 151                                 $this->dieUsage(
 152                                         'You don\'t have permission to view deleted revision content',
 153                                         'permissiondenied'
 154                                 );
 155                         }
 156                 }
 157                 // Check limits
 158                 $userMax = $fld_content ? ApiBase::LIMIT_SML1 : ApiBase::LIMIT_BIG1;
 159                 $botMax = $fld_content ? ApiBase::LIMIT_SML2 : ApiBase::LIMIT_BIG2;
 160
 161                 $limit = $params['limit'];
 162
 163                 if ( $limit == 'max' ) {
 164                         $limit = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 165                         $this->getResult()->setParsedLimit( $this->getModuleName(), $limit );
 166                 }
 167
 168                 $this->validateLimit( 'limit', $limit, 1, $userMax, $botMax );
 169
 170                 if ( $fld_token ) {
 171                         // Undelete tokens are identical for all pages, so we cache one here
 172                         $token = $user->getEditToken( '', $this->getMain()->getRequest() );
 173                 }
 174
 175                 $dir = $params['dir'];
 176
 177                 // We need a custom WHERE clause that matches all titles.
 178                 if ( $mode == 'revs' ) {
 179                         $lb = new LinkBatch( $titles );
 180                         $where = $lb->constructSet( 'ar', $db );
 181                         $this->addWhere( $where );
 182                 } elseif ( $mode == 'all' ) {
 183                         $this->addWhereFld( 'ar_namespace', $params['namespace'] );
 184
 185                         $from = $params['from'] === null
 186                                 ? null
 187                                 : $this->titlePartToKey( $params['from'], $params['namespace'] );
 188                         $to = $params['to'] === null
 189                                 ? null
 190                                 : $this->titlePartToKey( $params['to'], $params['namespace'] );
 191                         $this->addWhereRange( 'ar_title', $dir, $from, $to );
 192
 193                         if ( isset( $params['prefix'] ) ) {
 194                                 $this->addWhere( 'ar_title' . $db->buildLike(
 195                                         $this->titlePartToKey( $params['prefix'], $params['namespace'] ),
 196                                         $db->anyString() ) );
 197                         }
 198                 }
 199
 200                 if ( !is_null( $params['user'] ) ) {
 201                         $this->addWhereFld( 'ar_user_text', $params['user'] );
 202                 } elseif ( !is_null( $params['excludeuser'] ) ) {
 203                         $this->addWhere( 'ar_user_text != ' .
 204                                 $db->addQuotes( $params['excludeuser'] ) );
 205                 }
 206
 207                 if ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ) {
 208                         // Paranoia: avoid brute force searches (bug 17342)
 209                         // (shouldn't be able to get here without 'deletedhistory', but
 210                         // check it again just in case)
 211                         if ( !$user->isAllowed( 'deletedhistory' ) ) {
 212                                 $bitmask = Revision::DELETED_USER;
 213                         } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 214                                 $bitmask = Revision::DELETED_USER | Revision::DELETED_RESTRICTED;
 215                         } else {
 216                                 $bitmask = 0;
 217                         }
 218                         if ( $bitmask ) {
 219                                 $this->addWhere( $db->bitAnd( 'ar_deleted', $bitmask ) . " != $bitmask" );
 220                         }
 221                 }
 222
 223                 if ( !is_null( $params['continue'] ) ) {
 224                         $cont = explode( '|', $params['continue'] );
 225                         $op = ( $dir == 'newer' ? '>' : '<' );
 226                         if ( $mode == 'all' || $mode == 'revs' ) {
 227                                 $this->dieContinueUsageIf( count( $cont ) != 4 );
 228                                 $ns = intval( $cont[0] );
 229                                 $this->dieContinueUsageIf( strval( $ns ) !== $cont[0] );
 230                                 $title = $db->addQuotes( $cont[1] );
 231                                 $ts = $db->addQuotes( $db->timestamp( $cont[2] ) );
 232                                 $ar_id = (int)$cont[3];
 233                                 $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[3] );
 234                                 $this->addWhere( "ar_namespace $op $ns OR " .
 235                                         "(ar_namespace = $ns AND " .
 236                                         "(ar_title $op $title OR " .
 237                                         "(ar_title = $title AND " .
 238                                         "(ar_timestamp $op $ts OR " .
 239                                         "(ar_timestamp = $ts AND " .
 240                                         "ar_id $op= $ar_id)))))" );
 241                         } else {
 242                                 $this->dieContinueUsageIf( count( $cont ) != 2 );
 243                                 $ts = $db->addQuotes( $db->timestamp( $cont[0] ) );
 244                                 $ar_id = (int)$cont[1];
 245                                 $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[1] );
 246                                 $this->addWhere( "ar_timestamp $op $ts OR " .
 247                                         "(ar_timestamp = $ts AND " .
 248                                         "ar_id $op= $ar_id)" );
 249                         }
 250                 }
 251
 252                 $this->addOption( 'LIMIT', $limit + 1 );
 253                 $this->addOption(
 254                         'USE INDEX',
 255                         array( 'archive' => ( $mode == 'user' ? 'usertext_timestamp' : 'name_title_timestamp' ) )
 256                 );
 257                 if ( $mode == 'all' ) {
 258                         if ( $params['unique'] ) {
 259                                 // @todo Does this work on non-MySQL?
 260                                 $this->addOption( 'GROUP BY', 'ar_title' );
 261                         } else {
 262                                 $sort = ( $dir == 'newer' ? '' : ' DESC' );
 263                                 $this->addOption( 'ORDER BY', array(
 264                                         'ar_title' . $sort,
 265                                         'ar_timestamp' . $sort,
 266                                         'ar_id' . $sort,
 267                                 ) );
 268                         }
 269                 } else {
 270                         if ( $mode == 'revs' ) {
 271                                 // Sort by ns and title in the same order as timestamp for efficiency
 272                                 $this->addWhereRange( 'ar_namespace', $dir, null, null );
 273                                 $this->addWhereRange( 'ar_title', $dir, null, null );
 274                         }
 275                         $this->addTimestampWhereRange( 'ar_timestamp', $dir, $params['start'], $params['end'] );
 276                         // Include in ORDER BY for uniqueness
 277                         $this->addWhereRange( 'ar_id', $dir, null, null );
 278                 }
 279                 $res = $this->select( __METHOD__ );
 280                 $pageMap = array(); // Maps ns&title to (fake) pageid
 281                 $count = 0;
 282                 $newPageID = 0;
 283                 foreach ( $res as $row ) {
 284                         if ( ++$count > $limit ) {
 285                                 // We've had enough
 286                                 if ( $mode == 'all' || $mode == 'revs' ) {
 287                                         $this->setContinueEnumParameter( 'continue',
 288                                                 "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
 289                                         );
 290                                 } else {
 291                                         $this->setContinueEnumParameter( 'continue', "$row->ar_timestamp|$row->ar_id" );
 292                                 }
 293                                 break;
 294                         }
 295
 296                         $rev = array();
 297                         $anyHidden = false;
 298
 299                         $rev['timestamp'] = wfTimestamp( TS_ISO_8601, $row->ar_timestamp );
 300                         if ( $fld_revid ) {
 301                                 $rev['revid'] = intval( $row->ar_rev_id );
 302                         }
 303                         if ( $fld_parentid && !is_null( $row->ar_parent_id ) ) {
 304                                 $rev['parentid'] = intval( $row->ar_parent_id );
 305                         }
 306                         if ( $fld_user || $fld_userid ) {
 307                                 if ( $row->ar_deleted & Revision::DELETED_USER ) {
 308                                         $rev['userhidden'] = '';
 309                                         $anyHidden = true;
 310                                 }
 311                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_USER, $user ) ) {
 312                                         if ( $fld_user ) {
 313                                                 $rev['user'] = $row->ar_user_text;
 314                                         }
 315                                         if ( $fld_userid ) {
 316                                                 $rev['userid'] = $row->ar_user;
 317                                         }
 318                                 }
 319                         }
 320
 321                         if ( $fld_comment || $fld_parsedcomment ) {
 322                                 if ( $row->ar_deleted & Revision::DELETED_COMMENT ) {
 323                                         $rev['commenthidden'] = '';
 324                                         $anyHidden = true;
 325                                 }
 326                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_COMMENT, $user ) ) {
 327                                         if ( $fld_comment ) {
 328                                                 $rev['comment'] = $row->ar_comment;
 329                                         }
 330                                         if ( $fld_parsedcomment ) {
 331                                                 $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 332                                                 $rev['parsedcomment'] = Linker::formatComment( $row->ar_comment, $title );
 333                                         }
 334                                 }
 335                         }
 336
 337                         if ( $fld_minor && $row->ar_minor_edit == 1 ) {
 338                                 $rev['minor'] = '';
 339                         }
 340                         if ( $fld_len ) {
 341                                 $rev['len'] = $row->ar_len;
 342                         }
 343                         if ( $fld_sha1 ) {
 344                                 if ( $row->ar_deleted & Revision::DELETED_TEXT ) {
 345                                         $rev['sha1hidden'] = '';
 346                                         $anyHidden = true;
 347                                 }
 348                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_TEXT, $user ) ) {
 349                                         if ( $row->ar_sha1 != '' ) {
 350                                                 $rev['sha1'] = wfBaseConvert( $row->ar_sha1, 36, 16, 40 );
 351                                         } else {
 352                                                 $rev['sha1'] = '';
 353                                         }
 354                                 }
 355                         }
 356                         if ( $fld_content ) {
 357                                 if ( $row->ar_deleted & Revision::DELETED_TEXT ) {
 358                                         $rev['texthidden'] = '';
 359                                         $anyHidden = true;
 360                                 }
 361                                 if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_TEXT, $user ) ) {
 362                                         if ( isset( $row->ar_text ) && !$row->ar_text_id ) {
 363                                                 // Pre-1.5 ar_text row (if condition from Revision::newFromArchiveRow)
 364                                                 ApiResult::setContent( $rev, Revision::getRevisionText( $row, 'ar_' ) );
 365                                         } else {
 366                                                 ApiResult::setContent( $rev, Revision::getRevisionText( $row ) );
 367                                         }
 368                                 }
 369                         }
 370
 371                         if ( $fld_tags ) {
 372                                 if ( $row->ts_tags ) {
 373                                         $tags = explode( ',', $row->ts_tags );
 374                                         $this->getResult()->setIndexedTagName( $tags, 'tag' );
 375                                         $rev['tags'] = $tags;
 376                                 } else {
 377                                         $rev['tags'] = array();
 378                                 }
 379                         }
 380
 381                         if ( $anyHidden && ( $row->ar_deleted & Revision::DELETED_RESTRICTED ) ) {
 382                                 $rev['suppressed'] = '';
 383                         }
 384
 385                         if ( !isset( $pageMap[$row->ar_namespace][$row->ar_title] ) ) {
 386                                 $pageID = $newPageID++;
 387                                 $pageMap[$row->ar_namespace][$row->ar_title] = $pageID;
 388                                 $a['revisions'] = array( $rev );
 389                                 $result->setIndexedTagName( $a['revisions'], 'rev' );
 390                                 $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
 391                                 ApiQueryBase::addTitleInfo( $a, $title );
 392                                 if ( $fld_token ) {
 393                                         $a['token'] = $token;
 394                                 }
 395                                 $fit = $result->addValue( array( 'query', $this->getModuleName() ), $pageID, $a );
 396                         } else {
 397                                 $pageID = $pageMap[$row->ar_namespace][$row->ar_title];
 398                                 $fit = $result->addValue(
 399                                         array( 'query', $this->getModuleName(), $pageID, 'revisions' ),
 400                                         null, $rev );
 401                         }
 402                         if ( !$fit ) {
 403                                 if ( $mode == 'all' || $mode == 'revs' ) {
 404                                         $this->setContinueEnumParameter( 'continue',
 405                                                 "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
 406                                         );
 407                                 } else {
 408                                         $this->setContinueEnumParameter( 'continue', "$row->ar_timestamp|$row->ar_id" );
 409                                 }
 410                                 break;
 411                         }
 412                 }
 413                 $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'page' );
 414         }
 415
 416         public function getAllowedParams() {
 417                 return array(
 418                         'start' => array(
 419                                 ApiBase::PARAM_TYPE => 'timestamp'
 420                         ),
 421                         'end' => array(
 422                                 ApiBase::PARAM_TYPE => 'timestamp',
 423                         ),
 424                         'dir' => array(
 425                                 ApiBase::PARAM_TYPE => array(
 426                                         'newer',
 427                                         'older'
 428                                 ),
 429                                 ApiBase::PARAM_DFLT => 'older'
 430                         ),
 431                         'from' => null,
 432                         'to' => null,
 433                         'prefix' => null,
 434                         'continue' => null,
 435                         'unique' => false,
 436                         'tag' => null,
 437                         'user' => array(
 438                                 ApiBase::PARAM_TYPE => 'user'
 439                         ),
 440                         'excludeuser' => array(
 441                                 ApiBase::PARAM_TYPE => 'user'
 442                         ),
 443                         'namespace' => array(
 444                                 ApiBase::PARAM_TYPE => 'namespace',
 445                                 ApiBase::PARAM_DFLT => NS_MAIN,
 446                         ),
 447                         'limit' => array(
 448                                 ApiBase::PARAM_DFLT => 10,
 449                                 ApiBase::PARAM_TYPE => 'limit',
 450                                 ApiBase::PARAM_MIN => 1,
 451                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 452                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 453                         ),
 454                         'prop' => array(
 455                                 ApiBase::PARAM_DFLT => 'user|comment',
 456                                 ApiBase::PARAM_TYPE => array(
 457                                         'revid',
 458                                         'parentid',
 459                                         'user',
 460                                         'userid',
 461                                         'comment',
 462                                         'parsedcomment',
 463                                         'minor',
 464                                         'len',
 465                                         'sha1',
 466                                         'content',
 467                                         'token',
 468                                         'tags'
 469                                 ),
 470                                 ApiBase::PARAM_ISMULTI => true
 471                         ),
 472                 );
 473         }
 474
 475         public function getParamDescription() {
 476                 return array(
 477                         'start' => 'The timestamp to start enumerating from (1, 2)',
 478                         'end' => 'The timestamp to stop enumerating at (1, 2)',
 479                         'dir' => $this->getDirectionDescription( $this->getModulePrefix(), ' (1, 3)' ),
 480                         'from' => 'Start listing at this title (3)',
 481                         'to' => 'Stop listing at this title (3)',
 482                         'prefix' => 'Search for all page titles that begin with this value (3)',
 483                         'limit' => 'The maximum amount of revisions to list',
 484                         'prop' => array(
 485                                 'Which properties to get',
 486                                 ' revid          - Adds the revision ID of the deleted revision',
 487                                 ' parentid       - Adds the revision ID of the previous revision to the page',
 488                                 ' user           - Adds the user who made the revision',
 489                                 ' userid         - Adds the user ID whom made the revision',
 490                                 ' comment        - Adds the comment of the revision',
 491                                 ' parsedcomment  - Adds the parsed comment of the revision',
 492                                 ' minor          - Tags if the revision is minor',
 493                                 ' len            - Adds the length (bytes) of the revision',
 494                                 ' sha1           - Adds the SHA-1 (base 16) of the revision',
 495                                 ' content        - Adds the content of the revision',
 496                                 ' token          - Gives the edit token',
 497                                 ' tags           - Tags for the revision',
 498                         ),
 499                         'namespace' => 'Only list pages in this namespace (3)',
 500                         'user' => 'Only list revisions by this user',
 501                         'excludeuser' => 'Don\'t list revisions by this user',
 502                         'continue' => 'When more results are available, use this to continue',
 503                         'unique' => 'List only one revision for each page (3)',
 504                         'tag' => 'Only list revisions tagged with this tag',
 505                 );
 506         }
 507
 508         public function getDescription() {
 509                 $p = $this->getModulePrefix();
 510
 511                 return array(
 512                         'List deleted revisions.',
 513                         'Operates in three modes:',
 514                         ' 1) List deleted revisions for the given title(s), sorted by timestamp.',
 515                         ' 2) List deleted contributions for the given user, sorted by timestamp (no titles specified).',
 516                         ' 3) List all deleted revisions in the given namespace, sorted by title and timestamp',
 517                         "    (no titles specified, {$p}user not set).",
 518                         'Certain parameters only apply to some modes and are ignored in others.',
 519                         'For instance, a parameter marked (1) only applies to mode 1 and is ignored in modes 2 and 3.',
 520                 );
 521         }
 522
 523         public function getExamples() {
 524                 return array(
 525                         'api.php?action=query&list=deletedrevs&titles=Main%20Page|Talk:Main%20Page&' .
 526                                 'drprop=user|comment|content'
 527                                 => 'List the last deleted revisions of Main Page and Talk:Main Page, with content (mode 1)',
 528                         'api.php?action=query&list=deletedrevs&druser=Bob&drlimit=50'
 529                                 => 'List the last 50 deleted contributions by Bob (mode 2)',
 530                         'api.php?action=query&list=deletedrevs&drdir=newer&drlimit=50'
 531                                 => 'List the first 50 deleted revisions in the main namespace (mode 3)',
 532                         'api.php?action=query&list=deletedrevs&drdir=newer&drlimit=50&drnamespace=1&drunique='
 533                                 => 'List the first 50 deleted pages in the Talk namespace (mode 3):',
 534                 );
 535         }
 536
 537         public function getHelpUrls() {
 538                 return 'https://www.mediawiki.org/wiki/API:Deletedrevs';
 539         }
 540 }