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                         $this->contentFormat = $params['contentformat'];
 165                 }
 166
 167                 // Possible indexes used
 168                 $index = array();
 169
 170                 $userMax = ( $this->fld_content ? ApiBase::LIMIT_SML1 : ApiBase::LIMIT_BIG1 );
 171                 $botMax  = ( $this->fld_content ? ApiBase::LIMIT_SML2 : ApiBase::LIMIT_BIG2 );
 172                 $limit = $params['limit'];
 173                 if ( $limit == 'max' ) {
 174                         $limit = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 175                         $this->getResult()->setParsedLimit( $this->getModuleName(), $limit );
 176                 }
 177
 178                 if ( !is_null( $this->token ) || $pageCount > 0 ) {
 179                         $this->addFields( Revision::selectPageFields() );
 180                 }
 181
 182                 if ( isset( $prop['tags'] ) ) {
 183                         $this->fld_tags = true;
 184                         $this->addTables( 'tag_summary' );
 185                         $this->addJoinConds( array( 'tag_summary' => array( 'LEFT JOIN', array( 'rev_id=ts_rev_id' ) ) ) );
 186                         $this->addFields( 'ts_tags' );
 187                 }
 188
 189                 if ( !is_null( $params['tag'] ) ) {
 190                         $this->addTables( 'change_tag' );
 191                         $this->addJoinConds( array( 'change_tag' => array( 'INNER JOIN', array( 'rev_id=ct_rev_id' ) ) ) );
 192                         $this->addWhereFld( 'ct_tag' , $params['tag'] );
 193                         global $wgOldChangeTagsIndex;
 194                         $index['change_tag'] = $wgOldChangeTagsIndex ? 'ct_tag' : 'change_tag_tag_id';
 195                 }
 196
 197                 if ( isset( $prop['content'] ) || !is_null( $this->difftotext ) ) {
 198                         // For each page we will request, the user must have read rights for that page
 199                         foreach ( $pageSet->getGoodTitles() as $title ) {
 200                                 if ( !$title->userCan( 'read' ) ) {
 201                                         $this->dieUsage(
 202                                                 'The current user is not allowed to read ' . $title->getPrefixedText(),
 203                                                 'accessdenied' );
 204                                 }
 205                         }
 206
 207                         $this->addTables( 'text' );
 208                         $this->addWhere( 'rev_text_id=old_id' );
 209                         $this->addFields( 'old_id' );
 210                         $this->addFields( Revision::selectTextFields() );
 211
 212                         $this->fld_content = isset( $prop['content'] );
 213
 214                         $this->expandTemplates = $params['expandtemplates'];
 215                         $this->generateXML = $params['generatexml'];
 216                         $this->parseContent = $params['parse'];
 217                         if ( $this->parseContent ) {
 218                                 // Must manually initialize unset limit
 219                                 if ( is_null( $limit ) ) {
 220                                         $limit = 1;
 221                                 }
 222                                 // We are only going to parse 1 revision per request
 223                                 $this->validateLimit( 'limit', $limit, 1, 1, 1 );
 224                         }
 225                         if ( isset( $params['section'] ) ) {
 226                                 $this->section = $params['section'];
 227                         } else {
 228                                 $this->section = false;
 229                         }
 230                 }
 231
 232                 // add user name, if needed
 233                 if ( $this->fld_user ) {
 234                         $this->addTables( 'user' );
 235                         $this->addJoinConds( array( 'user' => Revision::userJoinCond() ) );
 236                         $this->addFields( Revision::selectUserFields() );
 237                 }
 238
 239                 // Bug 24166 - API error when using rvprop=tags
 240                 $this->addTables( 'revision' );
 241
 242                 if ( $enumRevMode ) {
 243                         // This is mostly to prevent parameter errors (and optimize SQL?)
 244                         if ( !is_null( $params['startid'] ) && !is_null( $params['start'] ) ) {
 245                                 $this->dieUsage( 'start and startid cannot be used together', 'badparams' );
 246                         }
 247
 248                         if ( !is_null( $params['endid'] ) && !is_null( $params['end'] ) ) {
 249                                 $this->dieUsage( 'end and endid cannot be used together', 'badparams' );
 250                         }
 251
 252                         if ( !is_null( $params['user'] ) && !is_null( $params['excludeuser'] ) ) {
 253                                 $this->dieUsage( 'user and excludeuser cannot be used together', 'badparams' );
 254                         }
 255
 256                         // This code makes an assumption that sorting by rev_id and rev_timestamp produces
 257                         // the same result. This way users may request revisions starting at a given time,
 258                         // but to page through results use the rev_id returned after each page.
 259                         // Switching to rev_id removes the potential problem of having more than
 260                         // one row with the same timestamp for the same page.
 261                         // The order needs to be the same as start parameter to avoid SQL filesort.
 262                         if ( is_null( $params['startid'] ) && is_null( $params['endid'] ) ) {
 263                                 $this->addTimestampWhereRange( 'rev_timestamp', $params['dir'],
 264                                         $params['start'], $params['end'] );
 265                         } else {
 266                                 $this->addWhereRange( 'rev_id', $params['dir'],
 267                                         $params['startid'], $params['endid'] );
 268                                 // One of start and end can be set
 269                                 // If neither is set, this does nothing
 270                                 $this->addTimestampWhereRange( 'rev_timestamp', $params['dir'],
 271                                         $params['start'], $params['end'], false );
 272                         }
 273
 274                         // must manually initialize unset limit
 275                         if ( is_null( $limit ) ) {
 276                                 $limit = 10;
 277                         }
 278                         $this->validateLimit( 'limit', $limit, 1, $userMax, $botMax );
 279
 280                         // There is only one ID, use it
 281                         $ids = array_keys( $pageSet->getGoodTitles() );
 282                         $this->addWhereFld( 'rev_page', reset( $ids ) );
 283
 284                         if ( !is_null( $params['user'] ) ) {
 285                                 $this->addWhereFld( 'rev_user_text', $params['user'] );
 286                         } elseif ( !is_null( $params['excludeuser'] ) ) {
 287                                 $this->addWhere( 'rev_user_text != ' .
 288                                         $db->addQuotes( $params['excludeuser'] ) );
 289                         }
 290                         if ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ) {
 291                                 // Paranoia: avoid brute force searches (bug 17342)
 292                                 $this->addWhere( $db->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' );
 293                         }
 294                 } elseif ( $revCount > 0 ) {
 295                         $max = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 296                         $revs = $pageSet->getRevisionIDs();
 297                         if ( self::truncateArray( $revs, $max ) ) {
 298                                 $this->setWarning( "Too many values supplied for parameter 'revids': the limit is $max" );
 299                         }
 300
 301                         // Get all revision IDs
 302                         $this->addWhereFld( 'rev_id', array_keys( $revs ) );
 303
 304                         if ( !is_null( $params['continue'] ) ) {
 305                                 $this->addWhere( 'rev_id >= ' . intval( $params['continue'] ) );
 306                         }
 307                         $this->addOption( 'ORDER BY', 'rev_id' );
 308
 309                         // assumption testing -- we should never get more then $revCount rows.
 310                         $limit = $revCount;
 311                 } elseif ( $pageCount > 0 ) {
 312                         $max = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 313                         $titles = $pageSet->getGoodTitles();
 314                         if ( self::truncateArray( $titles, $max ) ) {
 315                                 $this->setWarning( "Too many values supplied for parameter 'titles': the limit is $max" );
 316                         }
 317
 318                         // When working in multi-page non-enumeration mode,
 319                         // limit to the latest revision only
 320                         $this->addWhere( 'page_id=rev_page' );
 321                         $this->addWhere( 'page_latest=rev_id' );
 322
 323                         // Get all page IDs
 324                         $this->addWhereFld( 'page_id', array_keys( $titles ) );
 325                         // Every time someone relies on equality propagation, god kills a kitten :)
 326                         $this->addWhereFld( 'rev_page', array_keys( $titles ) );
 327
 328                         if ( !is_null( $params['continue'] ) ) {
 329                                 $cont = explode( '|', $params['continue'] );
 330                                 if ( count( $cont ) != 2 ) {
 331                                         $this->dieUsage( 'Invalid continue param. You should pass the original ' .
 332                                                         'value returned by the previous query', '_badcontinue' );
 333                                 }
 334                                 $pageid = intval( $cont[0] );
 335                                 $revid = intval( $cont[1] );
 336                                 $this->addWhere(
 337                                         "rev_page > $pageid OR " .
 338                                         "(rev_page = $pageid AND " .
 339                                         "rev_id >= $revid)"
 340                                 );
 341                         }
 342                         $this->addOption( 'ORDER BY', array(
 343                                 'rev_page',
 344                                 'rev_id'
 345                         ));
 346
 347                         // assumption testing -- we should never get more then $pageCount rows.
 348                         $limit = $pageCount;
 349                 } else {
 350                         ApiBase::dieDebug( __METHOD__, 'param validation?' );
 351                 }
 352
 353                 $this->addOption( 'LIMIT', $limit + 1 );
 354                 $this->addOption( 'USE INDEX', $index );
 355
 356                 $count = 0;
 357                 $res = $this->select( __METHOD__ );
 358
 359                 foreach ( $res as $row ) {
 360                         if ( ++ $count > $limit ) {
 361                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 362                                 if ( !$enumRevMode ) {
 363                                         ApiBase::dieDebug( __METHOD__, 'Got more rows then expected' ); // bug report
 364                                 }
 365                                 $this->setContinueEnumParameter( 'startid', intval( $row->rev_id ) );
 366                                 break;
 367                         }
 368
 369                         $fit = $this->addPageSubItem( $row->rev_page, $this->extractRowInfo( $row ), 'rev' );
 370                         if ( !$fit ) {
 371                                 if ( $enumRevMode ) {
 372                                         $this->setContinueEnumParameter( 'startid', intval( $row->rev_id ) );
 373                                 } elseif ( $revCount > 0 ) {
 374                                         $this->setContinueEnumParameter( 'continue', intval( $row->rev_id ) );
 375                                 } else {
 376                                         $this->setContinueEnumParameter( 'continue', intval( $row->rev_page ) .
 377                                                 '|' . intval( $row->rev_id ) );
 378                                 }
 379                                 break;
 380                         }
 381                 }
 382         }
 383
 384         private function extractRowInfo( $row ) {
 385                 $revision = new Revision( $row );
 386                 $title = $revision->getTitle();
 387                 $vals = array();
 388
 389                 if ( $this->fld_ids ) {
 390                         $vals['revid'] = intval( $revision->getId() );
 391                         // $vals['oldid'] = intval( $row->rev_text_id ); // todo: should this be exposed?
 392                         if ( !is_null( $revision->getParentId() ) ) {
 393                                 $vals['parentid'] = intval( $revision->getParentId() );
 394                         }
 395                 }
 396
 397                 if ( $this->fld_flags && $revision->isMinor() ) {
 398                         $vals['minor'] = '';
 399                 }
 400
 401                 if ( $this->fld_user || $this->fld_userid ) {
 402                         if ( $revision->isDeleted( Revision::DELETED_USER ) ) {
 403                                 $vals['userhidden'] = '';
 404                         } else {
 405                                 if ( $this->fld_user ) {
 406                                         $vals['user'] = $revision->getUserText();
 407                                 }
 408                                 $userid = $revision->getUser();
 409                                 if ( !$userid ) {
 410                                         $vals['anon'] = '';
 411                                 }
 412
 413                                 if ( $this->fld_userid ) {
 414                                         $vals['userid'] = $userid;
 415                                 }
 416                         }
 417                 }
 418
 419                 if ( $this->fld_timestamp ) {
 420                         $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $revision->getTimestamp() );
 421                 }
 422
 423                 if ( $this->fld_size ) {
 424                         if ( !is_null( $revision->getSize() ) ) {
 425                                 $vals['size'] = intval( $revision->getSize() );
 426                         } else {
 427                                 $vals['size'] = 0;
 428                         }
 429                 }
 430
 431                 if ( $this->fld_sha1 ) {
 432                         if ( $revision->getSha1() != '' ) {
 433                                 $vals['sha1'] = wfBaseConvert( $revision->getSha1(), 36, 16, 40 );
 434                         } else {
 435                                 $vals['sha1'] = '';
 436                         }
 437                 }
 438
 439                 if ( $this->fld_contentmodel ) {
 440                         $vals['contentmodel'] = $revision->getContentModel();
 441                 }
 442
 443                 if ( $this->fld_comment || $this->fld_parsedcomment ) {
 444                         if ( $revision->isDeleted( Revision::DELETED_COMMENT ) ) {
 445                                 $vals['commenthidden'] = '';
 446                         } else {
 447                                 $comment = $revision->getComment();
 448
 449                                 if ( $this->fld_comment ) {
 450                                         $vals['comment'] = $comment;
 451                                 }
 452
 453                                 if ( $this->fld_parsedcomment ) {
 454                                         $vals['parsedcomment'] = Linker::formatComment( $comment, $title );
 455                                 }
 456                         }
 457                 }
 458
 459                 if ( $this->fld_tags ) {
 460                         if ( $row->ts_tags ) {
 461                                 $tags = explode( ',', $row->ts_tags );
 462                                 $this->getResult()->setIndexedTagName( $tags, 'tag' );
 463                                 $vals['tags'] = $tags;
 464                         } else {
 465                                 $vals['tags'] = array();
 466                         }
 467                 }
 468
 469                 if ( !is_null( $this->token ) ) {
 470                         $tokenFunctions = $this->getTokenFunctions();
 471                         foreach ( $this->token as $t ) {
 472                                 $val = call_user_func( $tokenFunctions[$t], $title->getArticleID(), $title, $revision );
 473                                 if ( $val === false ) {
 474                                         $this->setWarning( "Action '$t' is not allowed for the current user" );
 475                                 } else {
 476                                         $vals[$t . 'token'] = $val;
 477                                 }
 478                         }
 479                 }
 480
 481                 $content = null;
 482                 global $wgParser;
 483                 if ( $this->fld_content || !is_null( $this->difftotext ) ) {
 484                         $content = $revision->getContent();
 485                         // Expand templates after getting section content because
 486                         // template-added sections don't count and Parser::preprocess()
 487                         // will have less input
 488                         if ( $this->section !== false ) {
 489                                 $content = $content->getSection( $this->section, false );
 490                                 if ( !$content ) {
 491                                         $this->dieUsage( "There is no section {$this->section} in r" . $revision->getId(), 'nosuchsection' );
 492                                 }
 493                         }
 494                 }
 495                 if ( $this->fld_content && !$revision->isDeleted( Revision::DELETED_TEXT ) ) {
 496                         $text = null;
 497
 498                         if ( $this->generateXML ) {
 499                                 if ( $content->getModel() === CONTENT_MODEL_WIKITEXT ) {
 500                                         $t = $content->getNativeData(); # note: don't set $text
 501
 502                                         $wgParser->startExternalParse( $title, ParserOptions::newFromContext( $this->getContext() ), OT_PREPROCESS );
 503                                         $dom = $wgParser->preprocessToDom( $t );
 504                                         if ( is_callable( array( $dom, 'saveXML' ) ) ) {
 505                                                 $xml = $dom->saveXML();
 506                                         } else {
 507                                                 $xml = $dom->__toString();
 508                                         }
 509                                         $vals['parsetree'] = $xml;
 510                                 } else {
 511                                         $this->setWarning( "Conversion to XML is supported for wikitext only, " .
 512                                                                                 $title->getPrefixedDBkey() .
 513                                                                                 " uses content model " . $content->getModel() . ")" );
 514                                 }
 515                         }
 516
 517                         if ( $this->expandTemplates && !$this->parseContent ) {
 518                                 #XXX: implement template expansion for all content types in ContentHandler?
 519                                 if ( $content->getModel() === CONTENT_MODEL_WIKITEXT ) {
 520                                         $text = $content->getNativeData();
 521
 522                                         $text = $wgParser->preprocess( $text, $title, ParserOptions::newFromContext( $this->getContext() ) );
 523                                 } else {
 524                                         $this->setWarning( "Template expansion is supported for wikitext only, " .
 525                                                 $title->getPrefixedDBkey() .
 526                                                 " uses content model " . $content->getModel() . ")" );
 527
 528                                         $text = false;
 529                                 }
 530                         }
 531                         if ( $this->parseContent ) {
 532                                 $po = $content->getParserOutput( $title, ParserOptions::newFromContext( $this->getContext() ) );
 533                                 $text = $po->getText();
 534                         }
 535
 536                         if ( $text === null ) {
 537                                 $format = $this->contentFormat ? $this->contentFormat : $content->getDefaultFormat();
 538
 539                                 if ( !$content->isSupportedFormat( $format ) ) {
 540                                         $model = $content->getModel();
 541                                         $name = $title->getPrefixedDBkey();
 542
 543                                         $this->dieUsage( "The requested format {$this->contentFormat} is not supported for content model $model used by $name", 'badformat' );
 544                                 }
 545
 546                                 $text = $content->serialize( $format );
 547                                 $vals['contentformat'] = $format;
 548                         }
 549
 550                         if ( $text !== false ) {
 551                                 ApiResult::setContent( $vals, $text );
 552                         }
 553                 } elseif ( $this->fld_content ) {
 554                         $vals['texthidden'] = '';
 555                 }
 556
 557                 if ( !is_null( $this->diffto ) || !is_null( $this->difftotext ) ) {
 558                         global $wgAPIMaxUncachedDiffs;
 559                         static $n = 0; // Number of uncached diffs we've had
 560                         if ( $n < $wgAPIMaxUncachedDiffs ) {
 561                                 $vals['diff'] = array();
 562                                 $context = new DerivativeContext( $this->getContext() );
 563                                 $context->setTitle( $title );
 564                                 $handler = ContentHandler::getForTitle( $title );
 565
 566                                 if ( !is_null( $this->difftotext ) ) {
 567                                         $model = $title->getContentModel();
 568
 569                                         if ( $this->contentFormat && !ContentHandler::getForModelID( $model )->isSupportedFormat( $this->contentFormat ) ) {
 570                                                 $name = $title->getPrefixedDBkey();
 571
 572                                                 $this->dieUsage( "The requested format {$this->contentFormat} is not supported for content model $model used by $name", 'badformat' );
 573                                         }
 574
 575                                         $difftocontent = ContentHandler::makeContent( $this->difftotext, $title, $model, $this->contentFormat );
 576
 577                                         $engine = $handler->createDifferenceEngine( $context );
 578                                         $engine->setContent( $content, $difftocontent );
 579                                 } else {
 580                                         $engine = $handler->createDifferenceEngine( $context, $revision->getID(), $this->diffto );
 581                                         $vals['diff']['from'] = $engine->getOldid();
 582                                         $vals['diff']['to'] = $engine->getNewid();
 583                                 }
 584                                 $difftext = $engine->getDiffBody();
 585                                 ApiResult::setContent( $vals['diff'], $difftext );
 586                                 if ( !$engine->wasCacheHit() ) {
 587                                         $n++;
 588                                 }
 589                         } else {
 590                                 $vals['diff']['notcached'] = '';
 591                         }
 592                 }
 593                 return $vals;
 594         }
 595
 596         public function getCacheMode( $params ) {
 597                 if ( isset( $params['token'] ) ) {
 598                         return 'private';
 599                 }
 600                 if ( !is_null( $params['prop'] ) && in_array( 'parsedcomment', $params['prop'] ) ) {
 601                         // formatComment() calls wfMsg() among other things
 602                         return 'anon-public-user-private';
 603                 }
 604                 return 'public';
 605         }
 606
 607         public function getAllowedParams() {
 608                 return array(
 609                         'prop' => array(
 610                                 ApiBase::PARAM_ISMULTI => true,
 611                                 ApiBase::PARAM_DFLT => 'ids|timestamp|flags|comment|user',
 612                                 ApiBase::PARAM_TYPE => array(
 613                                         'ids',
 614                                         'flags',
 615                                         'timestamp',
 616                                         'user',
 617                                         'userid',
 618                                         'size',
 619                                         'sha1',
 620                                         'contentmodel',
 621                                         'comment',
 622                                         'parsedcomment',
 623                                         'content',
 624                                         'tags'
 625                                 )
 626                         ),
 627                         'limit' => array(
 628                                 ApiBase::PARAM_TYPE => 'limit',
 629                                 ApiBase::PARAM_MIN => 1,
 630                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 631                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 632                         ),
 633                         'startid' => array(
 634                                 ApiBase::PARAM_TYPE => 'integer'
 635                         ),
 636                         'endid' => array(
 637                                 ApiBase::PARAM_TYPE => 'integer'
 638                         ),
 639                         'start' => array(
 640                                 ApiBase::PARAM_TYPE => 'timestamp'
 641                         ),
 642                         'end' => array(
 643                                 ApiBase::PARAM_TYPE => 'timestamp'
 644                         ),
 645                         'dir' => array(
 646                                 ApiBase::PARAM_DFLT => 'older',
 647                                 ApiBase::PARAM_TYPE => array(
 648                                         'newer',
 649                                         'older'
 650                                 )
 651                         ),
 652                         'user' => array(
 653                                 ApiBase::PARAM_TYPE => 'user'
 654                         ),
 655                         'excludeuser' => array(
 656                                 ApiBase::PARAM_TYPE => 'user'
 657                         ),
 658                         'tag' => null,
 659                         'expandtemplates' => false,
 660                         'generatexml' => false,
 661                         'parse' => false,
 662                         'section' => null,
 663                         'token' => array(
 664                                 ApiBase::PARAM_TYPE => array_keys( $this->getTokenFunctions() ),
 665                                 ApiBase::PARAM_ISMULTI => true
 666                         ),
 667                         'continue' => null,
 668                         'diffto' => null,
 669                         'difftotext' => null,
 670                         'contentformat' => array(
 671                                 ApiBase::PARAM_TYPE => ContentHandler::getAllContentFormats(),
 672                                 ApiBase::PARAM_DFLT => null
 673                         ),
 674                 );
 675         }
 676
 677         public function getParamDescription() {
 678                 $p = $this->getModulePrefix();
 679                 return array(
 680                         'prop' => array(
 681                                 'Which properties to get for each revision:',
 682                                 ' ids            - The ID of the revision',
 683                                 ' flags          - Revision flags (minor)',
 684                                 ' timestamp      - The timestamp of the revision',
 685                                 ' user           - User that made the revision',
 686                                 ' userid         - User id of revision creator',
 687                                 ' size           - Length (bytes) of the revision',
 688                                 ' sha1           - SHA-1 (base 16) of the revision',
 689                                 ' contentmodel   - Content model id',
 690                                 ' comment        - Comment by the user for revision',
 691                                 ' parsedcomment  - Parsed comment by the user for the revision',
 692                                 ' content        - Text of the revision',
 693                                 ' tags           - Tags for the revision',
 694                         ),
 695                         'limit' => 'Limit how many revisions will be returned (enum)',
 696                         'startid' => 'From which revision id to start enumeration (enum)',
 697                         'endid' => 'Stop revision enumeration on this revid (enum)',
 698                         'start' => 'From which revision timestamp to start enumeration (enum)',
 699                         'end' => 'Enumerate up to this timestamp (enum)',
 700                         'dir' => $this->getDirectionDescription( $p, ' (enum)' ),
 701                         'user' => 'Only include revisions made by user (enum)',
 702                         'excludeuser' => 'Exclude revisions made by user (enum)',
 703                         'expandtemplates' => 'Expand templates in revision content',
 704                         'generatexml' => 'Generate XML parse tree for revision content',
 705                         'parse' => 'Parse revision content. For performance reasons if this option is used, rvlimit is enforced to 1.',
 706                         'section' => 'Only retrieve the content of this section number',
 707                         'token' => 'Which tokens to obtain for each revision',
 708                         'continue' => 'When more results are available, use this to continue',
 709                         'diffto' => array( 'Revision ID to diff each revision to.',
 710                                 'Use "prev", "next" and "cur" for the previous, next and current revision respectively' ),
 711                         'difftotext' => array( 'Text to diff each revision to. Only diffs a limited number of revisions.',
 712                                 "Overrides {$p}diffto. If {$p}section is set, only that section will be diffed against this text" ),
 713                         'tag' => 'Only list revisions tagged with this tag',
 714                         'contentformat' => 'Serialization format used for difftotext and expected for output of content',
 715                 );
 716         }
 717
 718         public function getResultProperties() {
 719                 $props = array(
 720                         '' => array(),
 721                         'ids' => array(
 722                                 'revid' => 'integer',
 723                                 'parentid' => array(
 724                                         ApiBase::PROP_TYPE => 'integer',
 725                                         ApiBase::PROP_NULLABLE => true
 726                                 )
 727                         ),
 728                         'flags' => array(
 729                                 'minor' => 'boolean'
 730                         ),
 731                         'user' => array(
 732                                 'userhidden' => 'boolean',
 733                                 'user' => 'string',
 734                                 'anon' => 'boolean'
 735                         ),
 736                         'userid' => array(
 737                                 'userhidden' => 'boolean',
 738                                 'userid' => 'integer',
 739                                 'anon' => 'boolean'
 740                         ),
 741                         'timestamp' => array(
 742                                 'timestamp' => 'timestamp'
 743                         ),
 744                         'size' => array(
 745                                 'size' => 'integer'
 746                         ),
 747                         'sha1' => array(
 748                                 'sha1' => 'string'
 749                         ),
 750                         'comment' => array(
 751                                 'commenthidden' => 'boolean',
 752                                 'comment' => array(
 753                                         ApiBase::PROP_TYPE => 'string',
 754                                         ApiBase::PROP_NULLABLE => true
 755                                 )
 756                         ),
 757                         'parsedcomment' => array(
 758                                 'commenthidden' => 'boolean',
 759                                 'parsedcomment' => array(
 760                                         ApiBase::PROP_TYPE => 'string',
 761                                         ApiBase::PROP_NULLABLE => true
 762                                 )
 763                         ),
 764                         'content' => array(
 765                                 '*' => array(
 766                                         ApiBase::PROP_TYPE => 'string',
 767                                         ApiBase::PROP_NULLABLE => true
 768                                 ),
 769                                 'texthidden' => 'boolean'
 770                         )
 771                 );
 772
 773                 self::addTokenProperties( $props, $this->getTokenFunctions() );
 774
 775                 return $props;
 776         }
 777
 778         public function getDescription() {
 779                 return array(
 780                         'Get revision information',
 781                         'May be used in several ways:',
 782                         ' 1) Get data about a set of pages (last revision), by setting titles or pageids parameter',
 783                         ' 2) Get revisions for one given page, by using titles/pageids with start/end/limit params',
 784                         ' 3) Get data about a set of revisions by setting their IDs with revids parameter',
 785                         'All parameters marked as (enum) may only be used with a single page (#2)'
 786                 );
 787         }
 788
 789         public function getPossibleErrors() {
 790                 return array_merge( parent::getPossibleErrors(), array(
 791                         array( 'nosuchrevid', 'diffto' ),
 792                         array( 'code' => 'revids', 'info' => 'The revids= parameter may not be used with the list options (limit, startid, endid, dirNewer, start, end).' ),
 793                         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.' ),
 794                         array( 'code' => 'diffto', 'info' => 'rvdiffto must be set to a non-negative number, "prev", "next" or "cur"' ),
 795                         array( 'code' => 'badparams', 'info' => 'start and startid cannot be used together' ),
 796                         array( 'code' => 'badparams', 'info' => 'end and endid cannot be used together' ),
 797                         array( 'code' => 'badparams', 'info' => 'user and excludeuser cannot be used together' ),
 798                         array( 'code' => 'nosuchsection', 'info' => 'There is no section section in rID' ),
 799                         array( 'code' => 'badformat', 'info' => 'The requested serialization format can not be applied to the page\'s content model' ),
 800                 ) );
 801         }
 802
 803         public function getExamples() {
 804                 return array(
 805                         'Get data with content for the last revision of titles "API" and "Main Page"',
 806                         '  api.php?action=query&prop=revisions&titles=API|Main%20Page&rvprop=timestamp|user|comment|content',
 807                         'Get last 5 revisions of the "Main Page"',
 808                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment',
 809                         'Get first 5 revisions of the "Main Page"',
 810                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvdir=newer',
 811                         'Get first 5 revisions of the "Main Page" made after 2006-05-01',
 812                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvdir=newer&rvstart=20060501000000',
 813                         'Get first 5 revisions of the "Main Page" that were not made made by anonymous user "127.0.0.1"',
 814                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvexcludeuser=127.0.0.1',
 815                         'Get first 5 revisions of the "Main Page" that were made by the user "MediaWiki default"',
 816                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvuser=MediaWiki%20default',
 817                 );
 818         }
 819
 820         public function getHelpUrls() {
 821                 return 'https://www.mediawiki.org/wiki/API:Properties#revisions_.2F_rv';
 822         }
 823
 824         public function getVersion() {
 825                 return __CLASS__ . ': $Id$';
 826         }
 827 }