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