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 /**
  28  * A query action to enumerate revisions of a given page, or show top revisions of multiple pages.
  29  * Various pieces of information may be shown - flags, comments, and the actual wiki markup of the rev.
  30  * In the enumeration mode, ranges of revisions may be requested and filtered.
  31  *
  32  * @ingroup API
  33  */
  34 class ApiQueryRevisions extends ApiQueryBase {
  35
  36         private $diffto, $difftotext, $expandTemplates, $generateXML, $section,
  37                 $token, $parseContent, $contentFormat;
  38
  39         public function __construct( $query, $moduleName ) {
  40                 parent::__construct( $query, $moduleName, 'rv' );
  41         }
  42
  43         private $fld_ids = false, $fld_flags = false, $fld_timestamp = false, $fld_size = false, $fld_sha1 = false,
  44                         $fld_comment = false, $fld_parsedcomment = false, $fld_user = false, $fld_userid = false,
  45                         $fld_content = false, $fld_tags = false, $fld_contentmodel = false;
  46
  47         private $tokenFunctions;
  48
  49         protected function getTokenFunctions() {
  50                 // tokenname => function
  51                 // function prototype is func($pageid, $title, $rev)
  52                 // should return token or false
  53
  54                 // Don't call the hooks twice
  55                 if ( isset( $this->tokenFunctions ) ) {
  56                         return $this->tokenFunctions;
  57                 }
  58
  59                 // If we're in JSON callback mode, no tokens can be obtained
  60                 if ( !is_null( $this->getMain()->getRequest()->getVal( 'callback' ) ) ) {
  61                         return array();
  62                 }
  63
  64                 $this->tokenFunctions = array(
  65                         'rollback' => array( 'ApiQueryRevisions', 'getRollbackToken' )
  66                 );
  67                 wfRunHooks( 'APIQueryRevisionsTokens', array( &$this->tokenFunctions ) );
  68                 return $this->tokenFunctions;
  69         }
  70
  71         /**
  72          * @param $pageid
  73          * @param $title Title
  74          * @param $rev Revision
  75          * @return bool|String
  76          */
  77         public static function getRollbackToken( $pageid, $title, $rev ) {
  78                 global $wgUser;
  79                 if ( !$wgUser->isAllowed( 'rollback' ) ) {
  80                         return false;
  81                 }
  82                 return $wgUser->getEditToken(
  83                         array( $title->getPrefixedText(), $rev->getUserText() ) );
  84         }
  85
  86         public function execute() {
  87                 $params = $this->extractRequestParams( false );
  88
  89                 // If any of those parameters are used, work in 'enumeration' mode.
  90                 // Enum mode can only be used when exactly one page is provided.
  91                 // Enumerating revisions on multiple pages make it extremely
  92                 // difficult to manage continuations and require additional SQL indexes
  93                 $enumRevMode = ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ||
  94                                 !is_null( $params['limit'] ) || !is_null( $params['startid'] ) ||
  95                                 !is_null( $params['endid'] ) || $params['dir'] === 'newer' ||
  96                                 !is_null( $params['start'] ) || !is_null( $params['end'] ) );
  97
  98
  99                 $pageSet = $this->getPageSet();
 100                 $pageCount = $pageSet->getGoodTitleCount();
 101                 $revCount = $pageSet->getRevisionCount();
 102
 103                 // Optimization -- nothing to do
 104                 if ( $revCount === 0 && $pageCount === 0 ) {
 105                         return;
 106                 }
 107
 108                 if ( $revCount > 0 && $enumRevMode ) {
 109                         $this->dieUsage( 'The revids= parameter may not be used with the list options (limit, startid, endid, dirNewer, start, end).', 'revids' );
 110                 }
 111
 112                 if ( $pageCount > 1 && $enumRevMode ) {
 113                         $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' );
 114                 }
 115
 116                 if ( !is_null( $params['difftotext'] ) ) {
 117                         $this->difftotext = $params['difftotext'];
 118                 } elseif ( !is_null( $params['diffto'] ) ) {
 119                         if ( $params['diffto'] == 'cur' ) {
 120                                 $params['diffto'] = 0;
 121                         }
 122                         if ( ( !ctype_digit( $params['diffto'] ) || $params['diffto'] < 0 )
 123                                         && $params['diffto'] != 'prev' && $params['diffto'] != 'next' ) {
 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->isDeleted( 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_sha1 = isset ( $prop['sha1'] );
 158                 $this->fld_contentmodel = isset ( $prop['contentmodel'] );
 159                 $this->fld_userid = isset( $prop['userid'] );
 160                 $this->fld_user = isset ( $prop['user'] );
 161                 $this->token = $params['token'];
 162
 163                 if ( !empty( $params['contentformat'] ) ) {
 164                         $n = ContentHandler::getContentFormatID( $params['contentformat'] );
 165
 166                         if ( is_int( $n ) ) {
 167                                 $this->contentFormat = $n;
 168                         } else {
 169                                 $this->dieUsage( "Unknown format " . $params['contentformat'], 'badformat' );
 170                         }
 171                 }
 172
 173                 // Possible indexes used
 174                 $index = array();
 175
 176                 $userMax = ( $this->fld_content ? ApiBase::LIMIT_SML1 : ApiBase::LIMIT_BIG1 );
 177                 $botMax  = ( $this->fld_content ? ApiBase::LIMIT_SML2 : ApiBase::LIMIT_BIG2 );
 178                 $limit = $params['limit'];
 179                 if ( $limit == 'max' ) {
 180                         $limit = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 181                         $this->getResult()->setParsedLimit( $this->getModuleName(), $limit );
 182                 }
 183
 184                 if ( !is_null( $this->token ) || $pageCount > 0 ) {
 185                         $this->addFields( Revision::selectPageFields() );
 186                 }
 187
 188                 if ( isset( $prop['tags'] ) ) {
 189                         $this->fld_tags = true;
 190                         $this->addTables( 'tag_summary' );
 191                         $this->addJoinConds( array( 'tag_summary' => array( 'LEFT JOIN', array( 'rev_id=ts_rev_id' ) ) ) );
 192                         $this->addFields( 'ts_tags' );
 193                 }
 194
 195                 if ( !is_null( $params['tag'] ) ) {
 196                         $this->addTables( 'change_tag' );
 197                         $this->addJoinConds( array( 'change_tag' => array( 'INNER JOIN', array( 'rev_id=ct_rev_id' ) ) ) );
 198                         $this->addWhereFld( 'ct_tag' , $params['tag'] );
 199                         global $wgOldChangeTagsIndex;
 200                         $index['change_tag'] = $wgOldChangeTagsIndex ? 'ct_tag' : 'change_tag_tag_id';
 201                 }
 202
 203                 if ( isset( $prop['content'] ) || !is_null( $this->difftotext ) ) {
 204                         // For each page we will request, the user must have read rights for that page
 205                         foreach ( $pageSet->getGoodTitles() as $title ) {
 206                                 if ( !$title->userCan( 'read' ) ) {
 207                                         $this->dieUsage(
 208                                                 'The current user is not allowed to read ' . $title->getPrefixedText(),
 209                                                 'accessdenied' );
 210                                 }
 211                         }
 212
 213                         $this->addTables( 'text' );
 214                         $this->addWhere( 'rev_text_id=old_id' );
 215                         $this->addFields( 'old_id' );
 216                         $this->addFields( Revision::selectTextFields() );
 217
 218                         $this->fld_content = isset( $prop['content'] );
 219
 220                         $this->expandTemplates = $params['expandtemplates'];
 221                         $this->generateXML = $params['generatexml'];
 222                         $this->parseContent = $params['parse'];
 223                         if ( $this->parseContent ) {
 224                                 // Must manually initialize unset limit
 225                                 if ( is_null( $limit ) ) {
 226                                         $limit = 1;
 227                                 }
 228                                 // We are only going to parse 1 revision per request
 229                                 $this->validateLimit( 'limit', $limit, 1, 1, 1 );
 230                         }
 231                         if ( isset( $params['section'] ) ) {
 232                                 $this->section = $params['section'];
 233                         } else {
 234                                 $this->section = false;
 235                         }
 236                 }
 237
 238                 // add user name, if needed
 239                 if ( $this->fld_user ) {
 240                         $this->addTables( 'user' );
 241                         $this->addJoinConds( array( 'user' => Revision::userJoinCond() ) );
 242                         $this->addFields( Revision::selectUserFields() );
 243                 }
 244
 245                 // Bug 24166 - API error when using rvprop=tags
 246                 $this->addTables( 'revision' );
 247
 248                 if ( $enumRevMode ) {
 249                         // This is mostly to prevent parameter errors (and optimize SQL?)
 250                         if ( !is_null( $params['startid'] ) && !is_null( $params['start'] ) ) {
 251                                 $this->dieUsage( 'start and startid cannot be used together', 'badparams' );
 252                         }
 253
 254                         if ( !is_null( $params['endid'] ) && !is_null( $params['end'] ) ) {
 255                                 $this->dieUsage( 'end and endid cannot be used together', 'badparams' );
 256                         }
 257
 258                         if ( !is_null( $params['user'] ) && !is_null( $params['excludeuser'] ) ) {
 259                                 $this->dieUsage( 'user and excludeuser cannot be used together', 'badparams' );
 260                         }
 261
 262                         // This code makes an assumption that sorting by rev_id and rev_timestamp produces
 263                         // the same result. This way users may request revisions starting at a given time,
 264                         // but to page through results use the rev_id returned after each page.
 265                         // Switching to rev_id removes the potential problem of having more than
 266                         // one row with the same timestamp for the same page.
 267                         // The order needs to be the same as start parameter to avoid SQL filesort.
 268                         if ( is_null( $params['startid'] ) && is_null( $params['endid'] ) ) {
 269                                 $this->addTimestampWhereRange( 'rev_timestamp', $params['dir'],
 270                                         $params['start'], $params['end'] );
 271                         } else {
 272                                 $this->addWhereRange( 'rev_id', $params['dir'],
 273                                         $params['startid'], $params['endid'] );
 274                                 // One of start and end can be set
 275                                 // If neither is set, this does nothing
 276                                 $this->addTimestampWhereRange( 'rev_timestamp', $params['dir'],
 277                                         $params['start'], $params['end'], false );
 278                         }
 279
 280                         // must manually initialize unset limit
 281                         if ( is_null( $limit ) ) {
 282                                 $limit = 10;
 283                         }
 284                         $this->validateLimit( 'limit', $limit, 1, $userMax, $botMax );
 285
 286                         // There is only one ID, use it
 287                         $ids = array_keys( $pageSet->getGoodTitles() );
 288                         $this->addWhereFld( 'rev_page', reset( $ids ) );
 289
 290                         if ( !is_null( $params['user'] ) ) {
 291                                 $this->addWhereFld( 'rev_user_text', $params['user'] );
 292                         } elseif ( !is_null( $params['excludeuser'] ) ) {
 293                                 $this->addWhere( 'rev_user_text != ' .
 294                                         $db->addQuotes( $params['excludeuser'] ) );
 295                         }
 296                         if ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ) {
 297                                 // Paranoia: avoid brute force searches (bug 17342)
 298                                 $this->addWhere( $db->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' );
 299                         }
 300                 } elseif ( $revCount > 0 ) {
 301                         $max = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 302                         $revs = $pageSet->getRevisionIDs();
 303                         if ( self::truncateArray( $revs, $max ) ) {
 304                                 $this->setWarning( "Too many values supplied for parameter 'revids': the limit is $max" );
 305                         }
 306
 307                         // Get all revision IDs
 308                         $this->addWhereFld( 'rev_id', array_keys( $revs ) );
 309
 310                         if ( !is_null( $params['continue'] ) ) {
 311                                 $this->addWhere( 'rev_id >= ' . intval( $params['continue'] ) );
 312                         }
 313                         $this->addOption( 'ORDER BY', 'rev_id' );
 314
 315                         // assumption testing -- we should never get more then $revCount rows.
 316                         $limit = $revCount;
 317                 } elseif ( $pageCount > 0 ) {
 318                         $max = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 319                         $titles = $pageSet->getGoodTitles();
 320                         if ( self::truncateArray( $titles, $max ) ) {
 321                                 $this->setWarning( "Too many values supplied for parameter 'titles': the limit is $max" );
 322                         }
 323
 324                         // When working in multi-page non-enumeration mode,
 325                         // limit to the latest revision only
 326                         $this->addWhere( 'page_id=rev_page' );
 327                         $this->addWhere( 'page_latest=rev_id' );
 328
 329                         // Get all page IDs
 330                         $this->addWhereFld( 'page_id', array_keys( $titles ) );
 331                         // Every time someone relies on equality propagation, god kills a kitten :)
 332                         $this->addWhereFld( 'rev_page', array_keys( $titles ) );
 333
 334                         if ( !is_null( $params['continue'] ) ) {
 335                                 $cont = explode( '|', $params['continue'] );
 336                                 if ( count( $cont ) != 2 ) {
 337                                         $this->dieUsage( 'Invalid continue param. You should pass the original ' .
 338                                                         'value returned by the previous query', '_badcontinue' );
 339                                 }
 340                                 $pageid = intval( $cont[0] );
 341                                 $revid = intval( $cont[1] );
 342                                 $this->addWhere(
 343                                         "rev_page > $pageid OR " .
 344                                         "(rev_page = $pageid AND " .
 345                                         "rev_id >= $revid)"
 346                                 );
 347                         }
 348                         $this->addOption( 'ORDER BY', array(
 349                                 'rev_page',
 350                                 'rev_id'
 351                         ));
 352
 353                         // assumption testing -- we should never get more then $pageCount rows.
 354                         $limit = $pageCount;
 355                 } else {
 356                         ApiBase::dieDebug( __METHOD__, 'param validation?' );
 357                 }
 358
 359                 $this->addOption( 'LIMIT', $limit + 1 );
 360                 $this->addOption( 'USE INDEX', $index );
 361
 362                 $count = 0;
 363                 $res = $this->select( __METHOD__ );
 364
 365                 foreach ( $res as $row ) {
 366                         if ( ++ $count > $limit ) {
 367                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 368                                 if ( !$enumRevMode ) {
 369                                         ApiBase::dieDebug( __METHOD__, 'Got more rows then expected' ); // bug report
 370                                 }
 371                                 $this->setContinueEnumParameter( 'startid', intval( $row->rev_id ) );
 372                                 break;
 373                         }
 374
 375                         $fit = $this->addPageSubItem( $row->rev_page, $this->extractRowInfo( $row ), 'rev' );
 376                         if ( !$fit ) {
 377                                 if ( $enumRevMode ) {
 378                                         $this->setContinueEnumParameter( 'startid', intval( $row->rev_id ) );
 379                                 } elseif ( $revCount > 0 ) {
 380                                         $this->setContinueEnumParameter( 'continue', intval( $row->rev_id ) );
 381                                 } else {
 382                                         $this->setContinueEnumParameter( 'continue', intval( $row->rev_page ) .
 383                                                 '|' . intval( $row->rev_id ) );
 384                                 }
 385                                 break;
 386                         }
 387                 }
 388         }
 389
 390         private function extractRowInfo( $row ) {
 391                 $revision = new Revision( $row );
 392                 $title = $revision->getTitle();
 393                 $vals = array();
 394
 395                 if ( $this->fld_ids ) {
 396                         $vals['revid'] = intval( $revision->getId() );
 397                         // $vals['oldid'] = intval( $row->rev_text_id ); // todo: should this be exposed?
 398                         if ( !is_null( $revision->getParentId() ) ) {
 399                                 $vals['parentid'] = intval( $revision->getParentId() );
 400                         }
 401                 }
 402
 403                 if ( $this->fld_flags && $revision->isMinor() ) {
 404                         $vals['minor'] = '';
 405                 }
 406
 407                 if ( $this->fld_user || $this->fld_userid ) {
 408                         if ( $revision->isDeleted( Revision::DELETED_USER ) ) {
 409                                 $vals['userhidden'] = '';
 410                         } else {
 411                                 if ( $this->fld_user ) {
 412                                         $vals['user'] = $revision->getUserText();
 413                                 }
 414                                 $userid = $revision->getUser();
 415                                 if ( !$userid ) {
 416                                         $vals['anon'] = '';
 417                                 }
 418
 419                                 if ( $this->fld_userid ) {
 420                                         $vals['userid'] = $userid;
 421                                 }
 422                         }
 423                 }
 424
 425                 if ( $this->fld_timestamp ) {
 426                         $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $revision->getTimestamp() );
 427                 }
 428
 429                 if ( $this->fld_size ) {
 430                         if ( !is_null( $revision->getSize() ) ) {
 431                                 $vals['size'] = intval( $revision->getSize() );
 432                         } else {
 433                                 $vals['size'] = 0;
 434                         }
 435                 }
 436
 437                 if ( $this->fld_sha1 ) {
 438                         if ( $revision->getSha1() != '' ) {
 439                                 $vals['sha1'] = wfBaseConvert( $revision->getSha1(), 36, 16, 40 );
 440                         } else {
 441                                 $vals['sha1'] = '';
 442                         }
 443                 }
 444
 445                 if ( $this->fld_contentmodel ) {
 446                         $vals['contentmodel'] = $revision->getContentModel();
 447                 }
 448
 449                 if ( $this->fld_comment || $this->fld_parsedcomment ) {
 450                         if ( $revision->isDeleted( Revision::DELETED_COMMENT ) ) {
 451                                 $vals['commenthidden'] = '';
 452                         } else {
 453                                 $comment = $revision->getComment();
 454
 455                                 if ( $this->fld_comment ) {
 456                                         $vals['comment'] = $comment;
 457                                 }
 458
 459                                 if ( $this->fld_parsedcomment ) {
 460                                         $vals['parsedcomment'] = Linker::formatComment( $comment, $title );
 461                                 }
 462                         }
 463                 }
 464
 465                 if ( $this->fld_tags ) {
 466                         if ( $row->ts_tags ) {
 467                                 $tags = explode( ',', $row->ts_tags );
 468                                 $this->getResult()->setIndexedTagName( $tags, 'tag' );
 469                                 $vals['tags'] = $tags;
 470                         } else {
 471                                 $vals['tags'] = array();
 472                         }
 473                 }
 474
 475                 if ( !is_null( $this->token ) ) {
 476                         $tokenFunctions = $this->getTokenFunctions();
 477                         foreach ( $this->token as $t ) {
 478                                 $val = call_user_func( $tokenFunctions[$t], $title->getArticleID(), $title, $revision );
 479                                 if ( $val === false ) {
 480                                         $this->setWarning( "Action '$t' is not allowed for the current user" );
 481                                 } else {
 482                                         $vals[$t . 'token'] = $val;
 483                                 }
 484                         }
 485                 }
 486
 487                 $content = null;
 488                 global $wgParser;
 489                 if ( $this->fld_content || !is_null( $this->difftotext ) ) {
 490                         $content = $revision->getContent();
 491                         // Expand templates after getting section content because
 492                         // template-added sections don't count and Parser::preprocess()
 493                         // will have less input
 494                         if ( $this->section !== false ) {
 495                                 $content = $content->getSection( $this->section, false );
 496                                 if ( !$content ) {
 497                                         $this->dieUsage( "There is no section {$this->section} in r" . $revision->getId(), 'nosuchsection' );
 498                                 }
 499                         }
 500                 }
 501                 if ( $this->fld_content && !$revision->isDeleted( Revision::DELETED_TEXT ) ) {
 502                         $text = null;
 503
 504                         if ( $this->generateXML ) {
 505                                 if ( $content->getModel() === CONTENT_MODEL_WIKITEXT ) {
 506                                         $t = $content->getNativeData(); # note: don't set $text
 507
 508                                         $wgParser->startExternalParse( $title, ParserOptions::newFromContext( $this->getContext() ), OT_PREPROCESS );
 509                                         $dom = $wgParser->preprocessToDom( $t );
 510                                         if ( is_callable( array( $dom, 'saveXML' ) ) ) {
 511                                                 $xml = $dom->saveXML();
 512                                         } else {
 513                                                 $xml = $dom->__toString();
 514                                         }
 515                                         $vals['parsetree'] = $xml;
 516                                 } else {
 517                                         $this->setWarning( "Conversion to XML is supported for wikitext only, " .
 518                                                                                 $title->getPrefixedDBkey() .
 519                                                                                 " uses content model #" . $content->getModel() .
 520                                                                                 " (" . ContentHandler::getContentModelName( $content->getModel() ). ")" );
 521                                 }
 522                         }
 523
 524                         if ( $this->expandTemplates && !$this->parseContent ) {
 525                                 #XXX: implement template expansion for all content types in ContentHandler?
 526                                 if ( $content->getModel() === CONTENT_MODEL_WIKITEXT ) {
 527                                         $text = $content->getNativeData();
 528
 529                                         $text = $wgParser->preprocess( $text, $title, ParserOptions::newFromContext( $this->getContext() ) );
 530                                 } else {
 531                                         $this->setWarning( "Template expansion is supported for wikitext only, " .
 532                                                 $title->getPrefixedDBkey() .
 533                                                 " uses content model #" . $content->getModel() .
 534                                                 " (" . ContentHandler::getContentModelName( $content->getModel() ). ")" );
 535
 536                                         $text = false;
 537                                 }
 538                         }
 539                         if ( $this->parseContent ) {
 540                                 $po = $content->getParserOutput( $title, ParserOptions::newFromContext( $this->getContext() ) );
 541                                 $text = $po->getText();
 542                         }
 543
 544                         if ( $text === null ) {
 545                                 $format = $this->contentFormat ? $this->contentFormat : $content->getDefaultFormat();
 546
 547                                 if ( !$content->isSupportedFormat( $format ) ) {
 548                                         $model = $content->getModel();
 549                                         $formatName = ContentHandler::getContentFormatMimeType( $format );
 550                                         $modelName = ContentHandler::getContentModelName( $model );
 551                                         $name = $title->getPrefixedDBkey();
 552
 553                                         $this->dieUsage( "The requested format #{$this->contentFormat} ($formatName) is not supported for content model #$model ($modelName) used by $name", 'badformat' );
 554                                 }
 555
 556                                 $text = $content->serialize( $format );
 557                                 $vals['textformat'] = ContentHandler::getContentFormatMimeType( $format );
 558                         }
 559
 560                         if ( $text !== false ) {
 561                                 ApiResult::setContent( $vals, $text );
 562                         }
 563                 } elseif ( $this->fld_content ) {
 564                         $vals['texthidden'] = '';
 565                 }
 566
 567                 if ( !is_null( $this->diffto ) || !is_null( $this->difftotext ) ) {
 568                         global $wgAPIMaxUncachedDiffs;
 569                         static $n = 0; // Number of uncached diffs we've had
 570                         if ( $n < $wgAPIMaxUncachedDiffs ) {
 571                                 $vals['diff'] = array();
 572                                 $context = new DerivativeContext( $this->getContext() );
 573                                 $context->setTitle( $title );
 574                                 $handler = ContentHandler::getForTitle( $title );
 575
 576                                 if ( !is_null( $this->difftotext ) ) {
 577                                         $model = $title->getContentModel();
 578
 579                                         if ( $this->contentFormat && !ContentHandler::getForModelID( $model )->isSupportedFormat( $this->contentFormat ) ) {
 580                                                 $formatName = ContentHandler::getContentFormatMimeType( $this->contentFormat );
 581                                                 $modelName = ContentHandler::getContentModelName( $model );
 582                                                 $name = $title->getPrefixedDBkey();
 583
 584                                                 $this->dieUsage( "The requested format #{$this->contentFormat} ($formatName) is not supported for content model #$model ($modelName) used by $name", 'badformat' );
 585                                         }
 586
 587                                         $difftocontent = ContentHandler::makeContent( $this->difftotext, $title, $model, $this->contentFormat );
 588
 589                                         $engine = $handler->createDifferenceEngine( $context );
 590                                         $engine->setContent( $content, $difftocontent );
 591                                 } else {
 592                                         $engine = $handler->createDifferenceEngine( $context, $revision->getID(), $this->diffto );
 593                                         $vals['diff']['from'] = $engine->getOldid();
 594                                         $vals['diff']['to'] = $engine->getNewid();
 595                                 }
 596                                 $difftext = $engine->getDiffBody();
 597                                 ApiResult::setContent( $vals['diff'], $difftext );
 598                                 if ( !$engine->wasCacheHit() ) {
 599                                         $n++;
 600                                 }
 601                         } else {
 602                                 $vals['diff']['notcached'] = '';
 603                         }
 604                 }
 605                 return $vals;
 606         }
 607
 608         public function getCacheMode( $params ) {
 609                 if ( isset( $params['token'] ) ) {
 610                         return 'private';
 611                 }
 612                 if ( !is_null( $params['prop'] ) && in_array( 'parsedcomment', $params['prop'] ) ) {
 613                         // formatComment() calls wfMsg() among other things
 614                         return 'anon-public-user-private';
 615                 }
 616                 return 'public';
 617         }
 618
 619         public function getAllowedParams() {
 620                 return array(
 621                         'prop' => array(
 622                                 ApiBase::PARAM_ISMULTI => true,
 623                                 ApiBase::PARAM_DFLT => 'ids|timestamp|flags|comment|user',
 624                                 ApiBase::PARAM_TYPE => array(
 625                                         'ids',
 626                                         'flags',
 627                                         'timestamp',
 628                                         'user',
 629                                         'userid',
 630                                         'size',
 631                                         'sha1',
 632                                         'contentmodel',
 633                                         'comment',
 634                                         'parsedcomment',
 635                                         'content',
 636                                         'tags'
 637                                 )
 638                         ),
 639                         'limit' => array(
 640                                 ApiBase::PARAM_TYPE => 'limit',
 641                                 ApiBase::PARAM_MIN => 1,
 642                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 643                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 644                         ),
 645                         'startid' => array(
 646                                 ApiBase::PARAM_TYPE => 'integer'
 647                         ),
 648                         'endid' => array(
 649                                 ApiBase::PARAM_TYPE => 'integer'
 650                         ),
 651                         'start' => array(
 652                                 ApiBase::PARAM_TYPE => 'timestamp'
 653                         ),
 654                         'end' => array(
 655                                 ApiBase::PARAM_TYPE => 'timestamp'
 656                         ),
 657                         'dir' => array(
 658                                 ApiBase::PARAM_DFLT => 'older',
 659                                 ApiBase::PARAM_TYPE => array(
 660                                         'newer',
 661                                         'older'
 662                                 )
 663                         ),
 664                         'user' => array(
 665                                 ApiBase::PARAM_TYPE => 'user'
 666                         ),
 667                         'excludeuser' => array(
 668                                 ApiBase::PARAM_TYPE => 'user'
 669                         ),
 670                         'tag' => null,
 671                         'expandtemplates' => false,
 672                         'generatexml' => false,
 673                         'parse' => false,
 674                         'section' => null,
 675                         'token' => array(
 676                                 ApiBase::PARAM_TYPE => array_keys( $this->getTokenFunctions() ),
 677                                 ApiBase::PARAM_ISMULTI => true
 678                         ),
 679                         'continue' => null,
 680                         'diffto' => null,
 681                         'difftotext' => null,
 682                         'contentformat' => array(
 683                                 ApiBase::PARAM_TYPE => array_values( $GLOBALS[ 'wgContentFormatMimeTypes' ] ),
 684                                 ApiBase::PARAM_DFLT => null
 685                         ),
 686                 );
 687         }
 688
 689         public function getParamDescription() {
 690                 $p = $this->getModulePrefix();
 691                 return array(
 692                         'prop' => array(
 693                                 'Which properties to get for each revision:',
 694                                 ' ids            - The ID of the revision',
 695                                 ' flags          - Revision flags (minor)',
 696                                 ' timestamp      - The timestamp of the revision',
 697                                 ' user           - User that made the revision',
 698                                 ' userid         - User id of revision creator',
 699                                 ' size           - Length (bytes) of the revision',
 700                                 ' sha1           - SHA-1 (base 16) of the revision',
 701                                 ' contentmodel   - Content model id',
 702                                 ' comment        - Comment by the user for revision',
 703                                 ' parsedcomment  - Parsed comment by the user for the revision',
 704                                 ' content        - Text of the revision',
 705                                 ' tags           - Tags for the revision',
 706                         ),
 707                         'limit' => 'Limit how many revisions will be returned (enum)',
 708                         'startid' => 'From which revision id to start enumeration (enum)',
 709                         'endid' => 'Stop revision enumeration on this revid (enum)',
 710                         'start' => 'From which revision timestamp to start enumeration (enum)',
 711                         'end' => 'Enumerate up to this timestamp (enum)',
 712                         'dir' => $this->getDirectionDescription( $p, ' (enum)' ),
 713                         'user' => 'Only include revisions made by user (enum)',
 714                         'excludeuser' => 'Exclude revisions made by user (enum)',
 715                         'expandtemplates' => 'Expand templates in revision content',
 716                         'generatexml' => 'Generate XML parse tree for revision content',
 717                         'parse' => 'Parse revision content. For performance reasons if this option is used, rvlimit is enforced to 1.',
 718                         'section' => 'Only retrieve the content of this section number',
 719                         'token' => 'Which tokens to obtain for each revision',
 720                         'continue' => 'When more results are available, use this to continue',
 721                         'diffto' => array( 'Revision ID to diff each revision to.',
 722                                 'Use "prev", "next" and "cur" for the previous, next and current revision respectively' ),
 723                         'difftotext' => array( 'Text to diff each revision to. Only diffs a limited number of revisions.',
 724                                 "Overrides {$p}diffto. If {$p}section is set, only that section will be diffed against this text" ),
 725                         'tag' => 'Only list revisions tagged with this tag',
 726                         'contentformat' => 'Serialization format used for difftotext and expected for output of content',
 727                 );
 728         }
 729
 730         public function getDescription() {
 731                 return array(
 732                         'Get revision information',
 733                         'May be used in several ways:',
 734                         ' 1) Get data about a set of pages (last revision), by setting titles or pageids parameter',
 735                         ' 2) Get revisions for one given page, by using titles/pageids with start/end/limit params',
 736                         ' 3) Get data about a set of revisions by setting their IDs with revids parameter',
 737                         'All parameters marked as (enum) may only be used with a single page (#2)'
 738                 );
 739         }
 740
 741         public function getPossibleErrors() {
 742                 return array_merge( parent::getPossibleErrors(), array(
 743                         array( 'nosuchrevid', 'diffto' ),
 744                         array( 'code' => 'revids', 'info' => 'The revids= parameter may not be used with the list options (limit, startid, endid, dirNewer, start, end).' ),
 745                         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.' ),
 746                         array( 'code' => 'diffto', 'info' => 'rvdiffto must be set to a non-negative number, "prev", "next" or "cur"' ),
 747                         array( 'code' => 'badparams', 'info' => 'start and startid cannot be used together' ),
 748                         array( 'code' => 'badparams', 'info' => 'end and endid cannot be used together' ),
 749                         array( 'code' => 'badparams', 'info' => 'user and excludeuser cannot be used together' ),
 750                         array( 'code' => 'nosuchsection', 'info' => 'There is no section section in rID' ),
 751                         array( 'code' => 'badformat', 'info' => 'The requested serialization format can not be applied to the page\'s content model' ),
 752                 ) );
 753         }
 754
 755         public function getExamples() {
 756                 return array(
 757                         'Get data with content for the last revision of titles "API" and "Main Page"',
 758                         '  api.php?action=query&prop=revisions&titles=API|Main%20Page&rvprop=timestamp|user|comment|content',
 759                         'Get last 5 revisions of the "Main Page"',
 760                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment',
 761                         'Get first 5 revisions of the "Main Page"',
 762                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvdir=newer',
 763                         'Get first 5 revisions of the "Main Page" made after 2006-05-01',
 764                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvdir=newer&rvstart=20060501000000',
 765                         'Get first 5 revisions of the "Main Page" that were not made made by anonymous user "127.0.0.1"',
 766                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvexcludeuser=127.0.0.1',
 767                         'Get first 5 revisions of the "Main Page" that were made by the user "MediaWiki default"',
 768                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvuser=MediaWiki%20default',
 769                 );
 770         }
 771
 772         public function getHelpUrls() {
 773                 return 'https://www.mediawiki.org/wiki/API:Properties#revisions_.2F_rv';
 774         }
 775
 776         public function getVersion() {
 777                 return __CLASS__ . ': $Id$';
 778         }
 779 }