includes/api/ApiQueryRevisions.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on Sep 7, 2006
   6  *
   7  * Copyright © 2006 Yuri Astrakhan <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 if ( !defined( 'MEDIAWIKI' ) ) {
  28         // Eclipse helper - will be ignored in production
  29         require_once( 'ApiQueryBase.php' );
  30 }
  31
  32 /**
  33  * A query action to enumerate revisions of a given page, or show top revisions of multiple pages.
  34  * Various pieces of information may be shown - flags, comments, and the actual wiki markup of the rev.
  35  * In the enumeration mode, ranges of revisions may be requested and filtered.
  36  *
  37  * @ingroup API
  38  */
  39 class ApiQueryRevisions extends ApiQueryBase {
  40
  41         private $diffto, $difftotext, $expandTemplates, $generateXML, $section,
  42                 $token, $parseContent;
  43
  44         public function __construct( $query, $moduleName ) {
  45                 parent::__construct( $query, $moduleName, 'rv' );
  46         }
  47
  48         private $fld_ids = false, $fld_flags = false, $fld_timestamp = false, $fld_size = false,
  49                         $fld_comment = false, $fld_parsedcomment = false, $fld_user = false, $fld_userid = false,
  50                         $fld_content = false, $fld_tags = false;
  51
  52         private $tokenFunctions;
  53
  54         protected function getTokenFunctions() {
  55                 // tokenname => function
  56                 // function prototype is func($pageid, $title, $rev)
  57                 // should return token or false
  58
  59                 // Don't call the hooks twice
  60                 if ( isset( $this->tokenFunctions ) ) {
  61                         return $this->tokenFunctions;
  62                 }
  63
  64                 // If we're in JSON callback mode, no tokens can be obtained
  65                 if ( !is_null( $this->getMain()->getRequest()->getVal( 'callback' ) ) ) {
  66                         return array();
  67                 }
  68
  69                 $this->tokenFunctions = array(
  70                         'rollback' => array( 'ApiQueryRevisions', 'getRollbackToken' )
  71                 );
  72                 wfRunHooks( 'APIQueryRevisionsTokens', array( &$this->tokenFunctions ) );
  73                 return $this->tokenFunctions;
  74         }
  75
  76         /**
  77          * @param $pageid
  78          * @param $title Title
  79          * @param $rev Revision
  80          * @return bool|String
  81          */
  82         public static function getRollbackToken( $pageid, $title, $rev ) {
  83                 global $wgUser;
  84                 if ( !$wgUser->isAllowed( 'rollback' ) ) {
  85                         return false;
  86                 }
  87                 return $wgUser->editToken( array( $title->getPrefixedText(),
  88                                                 $rev->getUserText() ) );
  89         }
  90
  91         public function execute() {
  92                 $params = $this->extractRequestParams( false );
  93
  94                 // If any of those parameters are used, work in 'enumeration' mode.
  95                 // Enum mode can only be used when exactly one page is provided.
  96                 // Enumerating revisions on multiple pages make it extremely
  97                 // difficult to manage continuations and require additional SQL indexes
  98                 $enumRevMode = ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ||
  99                                 !is_null( $params['limit'] ) || !is_null( $params['startid'] ) ||
 100                                 !is_null( $params['endid'] ) || $params['dir'] === 'newer' ||
 101                                 !is_null( $params['start'] ) || !is_null( $params['end'] ) );
 102
 103
 104                 $pageSet = $this->getPageSet();
 105                 $pageCount = $pageSet->getGoodTitleCount();
 106                 $revCount = $pageSet->getRevisionCount();
 107
 108                 // Optimization -- nothing to do
 109                 if ( $revCount === 0 && $pageCount === 0 ) {
 110                         return;
 111                 }
 112
 113                 if ( $revCount > 0 && $enumRevMode ) {
 114                         $this->dieUsage( 'The revids= parameter may not be used with the list options (limit, startid, endid, dirNewer, start, end).', 'revids' );
 115                 }
 116
 117                 if ( $pageCount > 1 && $enumRevMode ) {
 118                         $this->dieUsage( 'titles, pageids or a generator was used to supply multiple pages, but the limit, startid, endid, dirNewer, user, excludeuser, start and end parameters may only be used on a single page.', 'multpages' );
 119                 }
 120
 121                 if ( !is_null( $params['difftotext'] ) ) {
 122                         $this->difftotext = $params['difftotext'];
 123                 } elseif ( !is_null( $params['diffto'] ) ) {
 124                         if ( $params['diffto'] == 'cur' ) {
 125                                 $params['diffto'] = 0;
 126                         }
 127                         if ( ( !ctype_digit( $params['diffto'] ) || $params['diffto'] < 0 )
 128                                         && $params['diffto'] != 'prev' && $params['diffto'] != 'next' ) {
 129                                 $this->dieUsage( 'rvdiffto must be set to a non-negative number, "prev", "next" or "cur"', 'diffto' );
 130                         }
 131                         // Check whether the revision exists and is readable,
 132                         // DifferenceEngine returns a rather ambiguous empty
 133                         // string if that's not the case
 134                         if ( $params['diffto'] != 0 ) {
 135                                 $difftoRev = Revision::newFromID( $params['diffto'] );
 136                                 if ( !$difftoRev ) {
 137                                         $this->dieUsageMsg( array( 'nosuchrevid', $params['diffto'] ) );
 138                                 }
 139                                 if ( !$difftoRev->userCan( Revision::DELETED_TEXT ) ) {
 140                                         $this->setWarning( "Couldn't diff to r{$difftoRev->getID()}: content is hidden" );
 141                                         $params['diffto'] = null;
 142                                 }
 143                         }
 144                         $this->diffto = $params['diffto'];
 145                 }
 146
 147                 $db = $this->getDB();
 148                 $this->addTables( 'page' );
 149                 $this->addFields( Revision::selectFields() );
 150                 $this->addWhere( 'page_id = rev_page' );
 151
 152                 $prop = array_flip( $params['prop'] );
 153
 154                 // Optional fields
 155                 $this->fld_ids = isset ( $prop['ids'] );
 156                 // $this->addFieldsIf('rev_text_id', $this->fld_ids); // should this be exposed?
 157                 $this->fld_flags = isset ( $prop['flags'] );
 158                 $this->fld_timestamp = isset ( $prop['timestamp'] );
 159                 $this->fld_comment = isset ( $prop['comment'] );
 160                 $this->fld_parsedcomment = isset ( $prop['parsedcomment'] );
 161                 $this->fld_size = isset ( $prop['size'] );
 162                 $this->fld_userid = isset( $prop['userid'] );
 163                 $this->fld_user = isset ( $prop['user'] );
 164                 $this->token = $params['token'];
 165
 166                 // Possible indexes used
 167                 $index = array();
 168
 169                 $userMax = ( $this->fld_content ? ApiBase::LIMIT_SML1 : ApiBase::LIMIT_BIG1 );
 170                 $botMax  = ( $this->fld_content ? ApiBase::LIMIT_SML2 : ApiBase::LIMIT_BIG2 );
 171                 $limit = $params['limit'];
 172                 if ( $limit == 'max' ) {
 173                         $limit = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 174                         $this->getResult()->setParsedLimit( $this->getModuleName(), $limit );
 175                 }
 176
 177                 if ( !is_null( $this->token ) || $pageCount > 0 ) {
 178                         $this->addFields( Revision::selectPageFields() );
 179                 }
 180
 181                 if ( isset( $prop['tags'] ) ) {
 182                         $this->fld_tags = true;
 183                         $this->addTables( 'tag_summary' );
 184                         $this->addJoinConds( array( 'tag_summary' => array( 'LEFT JOIN', array( 'rev_id=ts_rev_id' ) ) ) );
 185                         $this->addFields( 'ts_tags' );
 186                 }
 187
 188                 if ( !is_null( $params['tag'] ) ) {
 189                         $this->addTables( 'change_tag' );
 190                         $this->addJoinConds( array( 'change_tag' => array( 'INNER JOIN', array( 'rev_id=ct_rev_id' ) ) ) );
 191                         $this->addWhereFld( 'ct_tag' , $params['tag'] );
 192                         global $wgOldChangeTagsIndex;
 193                         $index['change_tag'] = $wgOldChangeTagsIndex ? 'ct_tag' : 'change_tag_tag_id';
 194                 }
 195
 196                 if ( isset( $prop['content'] ) || !is_null( $this->difftotext ) ) {
 197                         // For each page we will request, the user must have read rights for that page
 198                         foreach ( $pageSet->getGoodTitles() as $title ) {
 199                                 if ( !$title->userCanRead() ) {
 200                                         $this->dieUsage(
 201                                                 'The current user is not allowed to read ' . $title->getPrefixedText(),
 202                                                 'accessdenied' );
 203                                 }
 204                         }
 205
 206                         $this->addTables( 'text' );
 207                         $this->addWhere( 'rev_text_id=old_id' );
 208                         $this->addFields( 'old_id' );
 209                         $this->addFields( Revision::selectTextFields() );
 210
 211                         $this->fld_content = isset( $prop['content'] );
 212
 213                         $this->expandTemplates = $params['expandtemplates'];
 214                         $this->generateXML = $params['generatexml'];
 215                         $this->parseContent = $params['parse'];
 216                         if ( $this->parseContent ) {
 217                                 // Must manually initialize unset limit
 218                                 if ( is_null( $limit ) ) {
 219                                         $limit = 1;
 220                                 }
 221                                 // We are only going to parse 1 revision per request
 222                                 $this->validateLimit( 'limit', $limit, 1, 1, 1 );
 223                         }
 224                         if ( isset( $params['section'] ) ) {
 225                                 $this->section = $params['section'];
 226                         } else {
 227                                 $this->section = false;
 228                         }
 229                 }
 230
 231                 // Bug 24166 - API error when using rvprop=tags
 232                 $this->addTables( 'revision' );
 233
 234                 if ( $enumRevMode ) {
 235                         // This is mostly to prevent parameter errors (and optimize SQL?)
 236                         if ( !is_null( $params['startid'] ) && !is_null( $params['start'] ) ) {
 237                                 $this->dieUsage( 'start and startid cannot be used together', 'badparams' );
 238                         }
 239
 240                         if ( !is_null( $params['endid'] ) && !is_null( $params['end'] ) ) {
 241                                 $this->dieUsage( 'end and endid cannot be used together', 'badparams' );
 242                         }
 243
 244                         if ( !is_null( $params['user'] ) && !is_null( $params['excludeuser'] ) ) {
 245                                 $this->dieUsage( 'user and excludeuser cannot be used together', 'badparams' );
 246                         }
 247
 248                         // This code makes an assumption that sorting by rev_id and rev_timestamp produces
 249                         // the same result. This way users may request revisions starting at a given time,
 250                         // but to page through results use the rev_id returned after each page.
 251                         // Switching to rev_id removes the potential problem of having more than
 252                         // one row with the same timestamp for the same page.
 253                         // The order needs to be the same as start parameter to avoid SQL filesort.
 254                         if ( is_null( $params['startid'] ) && is_null( $params['endid'] ) ) {
 255                                 $this->addTimestampWhereRange( 'rev_timestamp', $params['dir'],
 256                                         $params['start'], $params['end'] );
 257                         } else {
 258                                 $this->addWhereRange( 'rev_id', $params['dir'],
 259                                         $params['startid'], $params['endid'] );
 260                                 // One of start and end can be set
 261                                 // If neither is set, this does nothing
 262                                 $this->addTimestampWhereRange( 'rev_timestamp', $params['dir'],
 263                                         $params['start'], $params['end'], false );
 264                         }
 265
 266                         // must manually initialize unset limit
 267                         if ( is_null( $limit ) ) {
 268                                 $limit = 10;
 269                         }
 270                         $this->validateLimit( 'limit', $limit, 1, $userMax, $botMax );
 271
 272                         // There is only one ID, use it
 273                         $ids = array_keys( $pageSet->getGoodTitles() );
 274                         $this->addWhereFld( 'rev_page', reset( $ids ) );
 275
 276                         if ( !is_null( $params['user'] ) ) {
 277                                 $this->addWhereFld( 'rev_user_text', $params['user'] );
 278                         } elseif ( !is_null( $params['excludeuser'] ) ) {
 279                                 $this->addWhere( 'rev_user_text != ' .
 280                                         $db->addQuotes( $params['excludeuser'] ) );
 281                         }
 282                         if ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ) {
 283                                 // Paranoia: avoid brute force searches (bug 17342)
 284                                 $this->addWhere( $db->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' );
 285                         }
 286                 } elseif ( $revCount > 0 ) {
 287                         $max = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 288                         $revs = $pageSet->getRevisionIDs();
 289                         if ( self::truncateArray( $revs, $max ) ) {
 290                                 $this->setWarning( "Too many values supplied for parameter 'revids': the limit is $max" );
 291                         }
 292
 293                         // Get all revision IDs
 294                         $this->addWhereFld( 'rev_id', array_keys( $revs ) );
 295
 296                         if ( !is_null( $params['continue'] ) ) {
 297                                 $this->addWhere( "rev_id >= '" . intval( $params['continue'] ) . "'" );
 298                         }
 299                         $this->addOption( 'ORDER BY', 'rev_id' );
 300
 301                         // assumption testing -- we should never get more then $revCount rows.
 302                         $limit = $revCount;
 303                 } elseif ( $pageCount > 0 ) {
 304                         $max = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 305                         $titles = $pageSet->getGoodTitles();
 306                         if ( self::truncateArray( $titles, $max ) ) {
 307                                 $this->setWarning( "Too many values supplied for parameter 'titles': the limit is $max" );
 308                         }
 309
 310                         // When working in multi-page non-enumeration mode,
 311                         // limit to the latest revision only
 312                         $this->addWhere( 'page_id=rev_page' );
 313                         $this->addWhere( 'page_latest=rev_id' );
 314
 315                         // Get all page IDs
 316                         $this->addWhereFld( 'page_id', array_keys( $titles ) );
 317                         // Every time someone relies on equality propagation, god kills a kitten :)
 318                         $this->addWhereFld( 'rev_page', array_keys( $titles ) );
 319
 320                         if ( !is_null( $params['continue'] ) ) {
 321                                 $cont = explode( '|', $params['continue'] );
 322                                 if ( count( $cont ) != 2 ) {
 323                                         $this->dieUsage( 'Invalid continue param. You should pass the original ' .
 324                                                         'value returned by the previous query', '_badcontinue' );
 325                                 }
 326                                 $pageid = intval( $cont[0] );
 327                                 $revid = intval( $cont[1] );
 328                                 $this->addWhere(
 329                                         "rev_page > '$pageid' OR " .
 330                                         "(rev_page = '$pageid' AND " .
 331                                         "rev_id >= '$revid')"
 332                                 );
 333                         }
 334                         $this->addOption( 'ORDER BY', 'rev_page, rev_id' );
 335
 336                         // assumption testing -- we should never get more then $pageCount rows.
 337                         $limit = $pageCount;
 338                 } else {
 339                         ApiBase::dieDebug( __METHOD__, 'param validation?' );
 340                 }
 341
 342                 $this->addOption( 'LIMIT', $limit + 1 );
 343                 $this->addOption( 'USE INDEX', $index );
 344
 345                 $count = 0;
 346                 $res = $this->select( __METHOD__ );
 347
 348                 foreach ( $res as $row ) {
 349                         if ( ++ $count > $limit ) {
 350                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 351                                 if ( !$enumRevMode ) {
 352                                         ApiBase::dieDebug( __METHOD__, 'Got more rows then expected' ); // bug report
 353                                 }
 354                                 $this->setContinueEnumParameter( 'startid', intval( $row->rev_id ) );
 355                                 break;
 356                         }
 357
 358                         $fit = $this->addPageSubItem( $row->rev_page, $this->extractRowInfo( $row ), 'rev' );
 359                         if ( !$fit ) {
 360                                 if ( $enumRevMode ) {
 361                                         $this->setContinueEnumParameter( 'startid', intval( $row->rev_id ) );
 362                                 } elseif ( $revCount > 0 ) {
 363                                         $this->setContinueEnumParameter( 'continue', intval( $row->rev_id ) );
 364                                 } else {
 365                                         $this->setContinueEnumParameter( 'continue', intval( $row->rev_page ) .
 366                                                 '|' . intval( $row->rev_id ) );
 367                                 }
 368                                 break;
 369                         }
 370                 }
 371         }
 372
 373         private function extractRowInfo( $row ) {
 374                 $revision = new Revision( $row );
 375                 $title = $revision->getTitle();
 376                 $vals = array();
 377
 378                 if ( $this->fld_ids ) {
 379                         $vals['revid'] = intval( $revision->getId() );
 380                         // $vals['oldid'] = intval( $row->rev_text_id ); // todo: should this be exposed?
 381                         if ( !is_null( $revision->getParentId() ) ) {
 382                                 $vals['parentid'] = intval( $revision->getParentId() );
 383                         }
 384                 }
 385
 386                 if ( $this->fld_flags && $revision->isMinor() ) {
 387                         $vals['minor'] = '';
 388                 }
 389
 390                 if ( $this->fld_user || $this->fld_userid ) {
 391                         if ( $revision->isDeleted( Revision::DELETED_USER ) ) {
 392                                 $vals['userhidden'] = '';
 393                         } else {
 394                                 if ( $this->fld_user ) {
 395                                         $vals['user'] = $revision->getUserText();
 396                                 }
 397                                 $userid = $revision->getUser();
 398                                 if ( !$userid ) {
 399                                         $vals['anon'] = '';
 400                                 }
 401
 402                                 if ( $this->fld_userid ) {
 403                                         $vals['userid'] = $userid;
 404                                 }
 405                         }
 406                 }
 407
 408                 if ( $this->fld_timestamp ) {
 409                         $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $revision->getTimestamp() );
 410                 }
 411
 412                 if ( $this->fld_size && !is_null( $revision->getSize() ) ) {
 413                         $vals['size'] = intval( $revision->getSize() );
 414                 }
 415
 416                 if ( $this->fld_comment || $this->fld_parsedcomment ) {
 417                         if ( $revision->isDeleted( Revision::DELETED_COMMENT ) ) {
 418                                 $vals['commenthidden'] = '';
 419                         } else {
 420                                 $comment = $revision->getComment();
 421
 422                                 if ( $this->fld_comment ) {
 423                                         $vals['comment'] = $comment;
 424                                 }
 425
 426                                 if ( $this->fld_parsedcomment ) {
 427                                         $vals['parsedcomment'] = Linker::formatComment( $comment, $title );
 428                                 }
 429                         }
 430                 }
 431
 432                 if ( $this->fld_tags ) {
 433                         if ( $row->ts_tags ) {
 434                                 $tags = explode( ',', $row->ts_tags );
 435                                 $this->getResult()->setIndexedTagName( $tags, 'tag' );
 436                                 $vals['tags'] = $tags;
 437                         } else {
 438                                 $vals['tags'] = array();
 439                         }
 440                 }
 441
 442                 if ( !is_null( $this->token ) ) {
 443                         $tokenFunctions = $this->getTokenFunctions();
 444                         foreach ( $this->token as $t ) {
 445                                 $val = call_user_func( $tokenFunctions[$t], $title->getArticleID(), $title, $revision );
 446                                 if ( $val === false ) {
 447                                         $this->setWarning( "Action '$t' is not allowed for the current user" );
 448                                 } else {
 449                                         $vals[$t . 'token'] = $val;
 450                                 }
 451                         }
 452                 }
 453
 454                 $text = null;
 455                 global $wgParser;
 456                 if ( $this->fld_content || !is_null( $this->difftotext ) ) {
 457                         $text = $revision->getText();
 458                         // Expand templates after getting section content because
 459                         // template-added sections don't count and Parser::preprocess()
 460                         // will have less input
 461                         if ( $this->section !== false ) {
 462                                 $text = $wgParser->getSection( $text, $this->section, false );
 463                                 if ( $text === false ) {
 464                                         $this->dieUsage( "There is no section {$this->section} in r" . $revision->getId(), 'nosuchsection' );
 465                                 }
 466                         }
 467                 }
 468                 if ( $this->fld_content && !$revision->isDeleted( Revision::DELETED_TEXT ) ) {
 469                         if ( $this->generateXML ) {
 470                                 $wgParser->startExternalParse( $title, new ParserOptions(), OT_PREPROCESS );
 471                                 $dom = $wgParser->preprocessToDom( $text );
 472                                 if ( is_callable( array( $dom, 'saveXML' ) ) ) {
 473                                         $xml = $dom->saveXML();
 474                                 } else {
 475                                         $xml = $dom->__toString();
 476                                 }
 477                                 $vals['parsetree'] = $xml;
 478
 479                         }
 480                         if ( $this->expandTemplates && !$this->parseContent ) {
 481                                 $text = $wgParser->preprocess( $text, $title, new ParserOptions() );
 482                         }
 483                         if ( $this->parseContent ) {
 484                                 $text = $wgParser->parse( $text, $title, new ParserOptions() )->getText();
 485                         }
 486                         ApiResult::setContent( $vals, $text );
 487                 } elseif ( $this->fld_content ) {
 488                         $vals['texthidden'] = '';
 489                 }
 490
 491                 if ( !is_null( $this->diffto ) || !is_null( $this->difftotext ) ) {
 492                         global $wgAPIMaxUncachedDiffs;
 493                         static $n = 0; // Number of uncached diffs we've had
 494                         if ( $n < $wgAPIMaxUncachedDiffs ) {
 495                                 $vals['diff'] = array();
 496                                 if ( !is_null( $this->difftotext ) ) {
 497                                         $engine = new DifferenceEngine( $title );
 498                                         $engine->setText( $text, $this->difftotext );
 499                                 } else {
 500                                         $engine = new DifferenceEngine( $title, $revision->getID(), $this->diffto );
 501                                         $vals['diff']['from'] = $engine->getOldid();
 502                                         $vals['diff']['to'] = $engine->getNewid();
 503                                 }
 504                                 $difftext = $engine->getDiffBody();
 505                                 ApiResult::setContent( $vals['diff'], $difftext );
 506                                 if ( !$engine->wasCacheHit() ) {
 507                                         $n++;
 508                                 }
 509                         } else {
 510                                 $vals['diff']['notcached'] = '';
 511                         }
 512                 }
 513                 return $vals;
 514         }
 515
 516         public function getCacheMode( $params ) {
 517                 if ( isset( $params['token'] ) ) {
 518                         return 'private';
 519                 }
 520                 if ( !is_null( $params['prop'] ) && in_array( 'parsedcomment', $params['prop'] ) ) {
 521                         // formatComment() calls wfMsg() among other things
 522                         return 'anon-public-user-private';
 523                 }
 524                 return 'public';
 525         }
 526
 527         public function getAllowedParams() {
 528                 return array(
 529                         'prop' => array(
 530                                 ApiBase::PARAM_ISMULTI => true,
 531                                 ApiBase::PARAM_DFLT => 'ids|timestamp|flags|comment|user',
 532                                 ApiBase::PARAM_TYPE => array(
 533                                         'ids',
 534                                         'flags',
 535                                         'timestamp',
 536                                         'user',
 537                                         'userid',
 538                                         'size',
 539                                         'comment',
 540                                         'parsedcomment',
 541                                         'content',
 542                                         'tags'
 543                                 )
 544                         ),
 545                         'limit' => array(
 546                                 ApiBase::PARAM_TYPE => 'limit',
 547                                 ApiBase::PARAM_MIN => 1,
 548                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 549                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 550                         ),
 551                         'startid' => array(
 552                                 ApiBase::PARAM_TYPE => 'integer'
 553                         ),
 554                         'endid' => array(
 555                                 ApiBase::PARAM_TYPE => 'integer'
 556                         ),
 557                         'start' => array(
 558                                 ApiBase::PARAM_TYPE => 'timestamp'
 559                         ),
 560                         'end' => array(
 561                                 ApiBase::PARAM_TYPE => 'timestamp'
 562                         ),
 563                         'dir' => array(
 564                                 ApiBase::PARAM_DFLT => 'older',
 565                                 ApiBase::PARAM_TYPE => array(
 566                                         'newer',
 567                                         'older'
 568                                 )
 569                         ),
 570                         'user' => array(
 571                                 ApiBase::PARAM_TYPE => 'user'
 572                         ),
 573                         'excludeuser' => array(
 574                                 ApiBase::PARAM_TYPE => 'user'
 575                         ),
 576                         'tag' => null,
 577                         'expandtemplates' => false,
 578                         'generatexml' => false,
 579                         'parse' => false,
 580                         'section' => null,
 581                         'token' => array(
 582                                 ApiBase::PARAM_TYPE => array_keys( $this->getTokenFunctions() ),
 583                                 ApiBase::PARAM_ISMULTI => true
 584                         ),
 585                         'continue' => null,
 586                         'diffto' => null,
 587                         'difftotext' => null,
 588                 );
 589         }
 590
 591         public function getParamDescription() {
 592                 $p = $this->getModulePrefix();
 593                 return array(
 594                         'prop' => array(
 595                                 'Which properties to get for each revision:',
 596                                 ' ids            - The ID of the revision',
 597                                 ' flags          - Revision flags (minor)',
 598                                 ' timestamp      - The timestamp of the revision',
 599                                 ' user           - User that made the revision',
 600                                 ' userid         - User id of revision creator',
 601                                 ' size           - Length of the revision',
 602                                 ' comment        - Comment by the user for revision',
 603                                 ' parsedcomment  - Parsed comment by the user for the revision',
 604                                 ' content        - Text of the revision',
 605                                 ' tags           - Tags for the revision',
 606                         ),
 607                         'limit' => 'Limit how many revisions will be returned (enum)',
 608                         'startid' => 'From which revision id to start enumeration (enum)',
 609                         'endid' => 'Stop revision enumeration on this revid (enum)',
 610                         'start' => 'From which revision timestamp to start enumeration (enum)',
 611                         'end' => 'Enumerate up to this timestamp (enum)',
 612                         'dir' => $this->getDirectionDescription( $p, ' (enum)' ),
 613                         'user' => 'Only include revisions made by user (enum)',
 614                         'excludeuser' => 'Exclude revisions made by user (enum)',
 615                         'expandtemplates' => 'Expand templates in revision content',
 616                         'generatexml' => 'Generate XML parse tree for revision content',
 617                         'parse' => 'Parse revision content. For performance reasons if this option is used, rvlimit is enforced to 1.',
 618                         'section' => 'Only retrieve the content of this section number',
 619                         'token' => 'Which tokens to obtain for each revision',
 620                         'continue' => 'When more results are available, use this to continue',
 621                         'diffto' => array( 'Revision ID to diff each revision to.',
 622                                 'Use "prev", "next" and "cur" for the previous, next and current revision respectively' ),
 623                         'difftotext' => array( 'Text to diff each revision to. Only diffs a limited number of revisions.',
 624                                 "Overrides {$p}diffto. If {$p}section is set, only that section will be diffed against this text" ),
 625                         'tag' => 'Only list revisions tagged with this tag',
 626                 );
 627         }
 628
 629         public function getDescription() {
 630                 return array(
 631                         'Get revision information',
 632                         'May be used in several ways:',
 633                         ' 1) Get data about a set of pages (last revision), by setting titles or pageids parameter',
 634                         ' 2) Get revisions for one given page, by using titles/pageids with start/end/limit params',
 635                         ' 3) Get data about a set of revisions by setting their IDs with revids parameter',
 636                         'All parameters marked as (enum) may only be used with a single page (#2)'
 637                 );
 638         }
 639
 640         public function getPossibleErrors() {
 641                 return array_merge( parent::getPossibleErrors(), array(
 642                         array( 'nosuchrevid', 'diffto' ),
 643                         array( 'code' => 'revids', 'info' => 'The revids= parameter may not be used with the list options (limit, startid, endid, dirNewer, start, end).' ),
 644                         array( 'code' => 'multpages', 'info' => 'titles, pageids or a generator was used to supply multiple pages, but the limit, startid, endid, dirNewer, user, excludeuser, start and end parameters may only be used on a single page.' ),
 645                         array( 'code' => 'diffto', 'info' => 'rvdiffto must be set to a non-negative number, "prev", "next" or "cur"' ),
 646                         array( 'code' => 'badparams', 'info' => 'start and startid cannot be used together' ),
 647                         array( 'code' => 'badparams', 'info' => 'end and endid cannot be used together' ),
 648                         array( 'code' => 'badparams', 'info' => 'user and excludeuser cannot be used together' ),
 649                         array( 'code' => 'nosuchsection', 'info' => 'There is no section section in rID' ),
 650                 ) );
 651         }
 652
 653         public function getExamples() {
 654                 return array(
 655                         'Get data with content for the last revision of titles "API" and "Main Page":',
 656                         '  api.php?action=query&prop=revisions&titles=API|Main%20Page&rvprop=timestamp|user|comment|content',
 657                         'Get last 5 revisions of the "Main Page":',
 658                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment',
 659                         'Get first 5 revisions of the "Main Page":',
 660                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvdir=newer',
 661                         'Get first 5 revisions of the "Main Page" made after 2006-05-01:',
 662                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvdir=newer&rvstart=20060501000000',
 663                         'Get first 5 revisions of the "Main Page" that were not made made by anonymous user "127.0.0.1"',
 664                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvexcludeuser=127.0.0.1',
 665                         'Get first 5 revisions of the "Main Page" that were made by the user "MediaWiki default"',
 666                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvuser=MediaWiki%20default',
 667                 );
 668         }
 669
 670         public function getHelpUrls() {
 671                 return 'http://www.mediawiki.org/wiki/API:Properties#revisions_.2F_rv';
 672         }
 673
 674         public function getVersion() {
 675                 return __CLASS__ . ': $Id$';
 676         }
 677 }