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                         $user = $this->getUser();
 200                         foreach ( $pageSet->getGoodTitles() as $title ) {
 201                                 if ( !$title->userCan( 'read', $user ) ) {
 202                                         $this->dieUsage(
 203                                                 'The current user is not allowed to read ' . $title->getPrefixedText(),
 204                                                 'accessdenied' );
 205                                 }
 206                         }
 207
 208                         $this->addTables( 'text' );
 209                         $this->addWhere( 'rev_text_id=old_id' );
 210                         $this->addFields( 'old_id' );
 211                         $this->addFields( Revision::selectTextFields() );
 212
 213                         $this->fld_content = isset( $prop['content'] );
 214
 215                         $this->expandTemplates = $params['expandtemplates'];
 216                         $this->generateXML = $params['generatexml'];
 217                         $this->parseContent = $params['parse'];
 218                         if ( $this->parseContent ) {
 219                                 // Must manually initialize unset limit
 220                                 if ( is_null( $limit ) ) {
 221                                         $limit = 1;
 222                                 }
 223                                 // We are only going to parse 1 revision per request
 224                                 $this->validateLimit( 'limit', $limit, 1, 1, 1 );
 225                         }
 226                         if ( isset( $params['section'] ) ) {
 227                                 $this->section = $params['section'];
 228                         } else {
 229                                 $this->section = false;
 230                         }
 231                 }
 232
 233                 // add user name, if needed
 234                 if ( $this->fld_user ) {
 235                         $this->addTables( 'user' );
 236                         $this->addJoinConds( array( 'user' => Revision::userJoinCond() ) );
 237                         $this->addFields( Revision::selectUserFields() );
 238                 }
 239
 240                 // Bug 24166 - API error when using rvprop=tags
 241                 $this->addTables( 'revision' );
 242
 243                 if ( $enumRevMode ) {
 244                         // This is mostly to prevent parameter errors (and optimize SQL?)
 245                         if ( !is_null( $params['startid'] ) && !is_null( $params['start'] ) ) {
 246                                 $this->dieUsage( 'start and startid cannot be used together', 'badparams' );
 247                         }
 248
 249                         if ( !is_null( $params['endid'] ) && !is_null( $params['end'] ) ) {
 250                                 $this->dieUsage( 'end and endid cannot be used together', 'badparams' );
 251                         }
 252
 253                         if ( !is_null( $params['user'] ) && !is_null( $params['excludeuser'] ) ) {
 254                                 $this->dieUsage( 'user and excludeuser cannot be used together', 'badparams' );
 255                         }
 256
 257                         // Continuing effectively uses startid. But we can't use rvstartid
 258                         // directly, because there is no way to tell the client to ''not''
 259                         // send rvstart if it sent it in the original query. So instead we
 260                         // send the continuation startid as rvcontinue, and ignore both
 261                         // rvstart and rvstartid when that is supplied.
 262                         if ( !is_null( $params['continue'] ) ) {
 263                                 $params['startid'] = $params['continue'];
 264                                 $params['start'] = null;
 265                         }
 266
 267                         // This code makes an assumption that sorting by rev_id and rev_timestamp produces
 268                         // the same result. This way users may request revisions starting at a given time,
 269                         // but to page through results use the rev_id returned after each page.
 270                         // Switching to rev_id removes the potential problem of having more than
 271                         // one row with the same timestamp for the same page.
 272                         // The order needs to be the same as start parameter to avoid SQL filesort.
 273                         if ( is_null( $params['startid'] ) && is_null( $params['endid'] ) ) {
 274                                 $this->addTimestampWhereRange( 'rev_timestamp', $params['dir'],
 275                                         $params['start'], $params['end'] );
 276                         } else {
 277                                 $this->addWhereRange( 'rev_id', $params['dir'],
 278                                         $params['startid'], $params['endid'] );
 279                                 // One of start and end can be set
 280                                 // If neither is set, this does nothing
 281                                 $this->addTimestampWhereRange( 'rev_timestamp', $params['dir'],
 282                                         $params['start'], $params['end'], false );
 283                         }
 284
 285                         // must manually initialize unset limit
 286                         if ( is_null( $limit ) ) {
 287                                 $limit = 10;
 288                         }
 289                         $this->validateLimit( 'limit', $limit, 1, $userMax, $botMax );
 290
 291                         // There is only one ID, use it
 292                         $ids = array_keys( $pageSet->getGoodTitles() );
 293                         $this->addWhereFld( 'rev_page', reset( $ids ) );
 294
 295                         if ( !is_null( $params['user'] ) ) {
 296                                 $this->addWhereFld( 'rev_user_text', $params['user'] );
 297                         } elseif ( !is_null( $params['excludeuser'] ) ) {
 298                                 $this->addWhere( 'rev_user_text != ' .
 299                                         $db->addQuotes( $params['excludeuser'] ) );
 300                         }
 301                         if ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ) {
 302                                 // Paranoia: avoid brute force searches (bug 17342)
 303                                 $this->addWhere( $db->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' );
 304                         }
 305                 } elseif ( $revCount > 0 ) {
 306                         $max = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 307                         $revs = $pageSet->getRevisionIDs();
 308                         if ( self::truncateArray( $revs, $max ) ) {
 309                                 $this->setWarning( "Too many values supplied for parameter 'revids': the limit is $max" );
 310                         }
 311
 312                         // Get all revision IDs
 313                         $this->addWhereFld( 'rev_id', array_keys( $revs ) );
 314
 315                         if ( !is_null( $params['continue'] ) ) {
 316                                 $this->addWhere( 'rev_id >= ' . intval( $params['continue'] ) );
 317                         }
 318                         $this->addOption( 'ORDER BY', 'rev_id' );
 319
 320                         // assumption testing -- we should never get more then $revCount rows.
 321                         $limit = $revCount;
 322                 } elseif ( $pageCount > 0 ) {
 323                         $max = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 324                         $titles = $pageSet->getGoodTitles();
 325                         if ( self::truncateArray( $titles, $max ) ) {
 326                                 $this->setWarning( "Too many values supplied for parameter 'titles': the limit is $max" );
 327                         }
 328
 329                         // When working in multi-page non-enumeration mode,
 330                         // limit to the latest revision only
 331                         $this->addWhere( 'page_id=rev_page' );
 332                         $this->addWhere( 'page_latest=rev_id' );
 333
 334                         // Get all page IDs
 335                         $this->addWhereFld( 'page_id', array_keys( $titles ) );
 336                         // Every time someone relies on equality propagation, god kills a kitten :)
 337                         $this->addWhereFld( 'rev_page', array_keys( $titles ) );
 338
 339                         if ( !is_null( $params['continue'] ) ) {
 340                                 $cont = explode( '|', $params['continue'] );
 341                                 if ( count( $cont ) != 2 ) {
 342                                         $this->dieUsage( 'Invalid continue param. You should pass the original ' .
 343                                                         'value returned by the previous query', '_badcontinue' );
 344                                 }
 345                                 $pageid = intval( $cont[0] );
 346                                 $revid = intval( $cont[1] );
 347                                 $this->addWhere(
 348                                         "rev_page > $pageid OR " .
 349                                         "(rev_page = $pageid AND " .
 350                                         "rev_id >= $revid)"
 351                                 );
 352                         }
 353                         $this->addOption( 'ORDER BY', array(
 354                                 'rev_page',
 355                                 'rev_id'
 356                         ));
 357
 358                         // assumption testing -- we should never get more then $pageCount rows.
 359                         $limit = $pageCount;
 360                 } else {
 361                         ApiBase::dieDebug( __METHOD__, 'param validation?' );
 362                 }
 363
 364                 $this->addOption( 'LIMIT', $limit + 1 );
 365                 $this->addOption( 'USE INDEX', $index );
 366
 367                 $count = 0;
 368                 $res = $this->select( __METHOD__ );
 369
 370                 foreach ( $res as $row ) {
 371                         if ( ++ $count > $limit ) {
 372                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 373                                 if ( !$enumRevMode ) {
 374                                         ApiBase::dieDebug( __METHOD__, 'Got more rows then expected' ); // bug report
 375                                 }
 376                                 $this->setContinueEnumParameter( 'continue', intval( $row->rev_id ) );
 377                                 break;
 378                         }
 379
 380                         $fit = $this->addPageSubItem( $row->rev_page, $this->extractRowInfo( $row ), 'rev' );
 381                         if ( !$fit ) {
 382                                 if ( $enumRevMode ) {
 383                                         $this->setContinueEnumParameter( 'continue', intval( $row->rev_id ) );
 384                                 } elseif ( $revCount > 0 ) {
 385                                         $this->setContinueEnumParameter( 'continue', intval( $row->rev_id ) );
 386                                 } else {
 387                                         $this->setContinueEnumParameter( 'continue', intval( $row->rev_page ) .
 388                                                 '|' . intval( $row->rev_id ) );
 389                                 }
 390                                 break;
 391                         }
 392                 }
 393         }
 394
 395         private function extractRowInfo( $row ) {
 396                 $revision = new Revision( $row );
 397                 $title = $revision->getTitle();
 398                 $vals = array();
 399
 400                 if ( $this->fld_ids ) {
 401                         $vals['revid'] = intval( $revision->getId() );
 402                         // $vals['oldid'] = intval( $row->rev_text_id ); // todo: should this be exposed?
 403                         if ( !is_null( $revision->getParentId() ) ) {
 404                                 $vals['parentid'] = intval( $revision->getParentId() );
 405                         }
 406                 }
 407
 408                 if ( $this->fld_flags && $revision->isMinor() ) {
 409                         $vals['minor'] = '';
 410                 }
 411
 412                 if ( $this->fld_user || $this->fld_userid ) {
 413                         if ( $revision->isDeleted( Revision::DELETED_USER ) ) {
 414                                 $vals['userhidden'] = '';
 415                         } else {
 416                                 if ( $this->fld_user ) {
 417                                         $vals['user'] = $revision->getUserText();
 418                                 }
 419                                 $userid = $revision->getUser();
 420                                 if ( !$userid ) {
 421                                         $vals['anon'] = '';
 422                                 }
 423
 424                                 if ( $this->fld_userid ) {
 425                                         $vals['userid'] = $userid;
 426                                 }
 427                         }
 428                 }
 429
 430                 if ( $this->fld_timestamp ) {
 431                         $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $revision->getTimestamp() );
 432                 }
 433
 434                 if ( $this->fld_size ) {
 435                         if ( !is_null( $revision->getSize() ) ) {
 436                                 $vals['size'] = intval( $revision->getSize() );
 437                         } else {
 438                                 $vals['size'] = 0;
 439                         }
 440                 }
 441
 442                 if ( $this->fld_sha1 ) {
 443                         if ( $revision->getSha1() != '' ) {
 444                                 $vals['sha1'] = wfBaseConvert( $revision->getSha1(), 36, 16, 40 );
 445                         } else {
 446                                 $vals['sha1'] = '';
 447                         }
 448                 }
 449
 450                 if ( $this->fld_contentmodel ) {
 451                         $vals['contentmodel'] = $revision->getContentModel();
 452                 }
 453
 454                 if ( $this->fld_comment || $this->fld_parsedcomment ) {
 455                         if ( $revision->isDeleted( Revision::DELETED_COMMENT ) ) {
 456                                 $vals['commenthidden'] = '';
 457                         } else {
 458                                 $comment = $revision->getComment();
 459
 460                                 if ( $this->fld_comment ) {
 461                                         $vals['comment'] = $comment;
 462                                 }
 463
 464                                 if ( $this->fld_parsedcomment ) {
 465                                         $vals['parsedcomment'] = Linker::formatComment( $comment, $title );
 466                                 }
 467                         }
 468                 }
 469
 470                 if ( $this->fld_tags ) {
 471                         if ( $row->ts_tags ) {
 472                                 $tags = explode( ',', $row->ts_tags );
 473                                 $this->getResult()->setIndexedTagName( $tags, 'tag' );
 474                                 $vals['tags'] = $tags;
 475                         } else {
 476                                 $vals['tags'] = array();
 477                         }
 478                 }
 479
 480                 if ( !is_null( $this->token ) ) {
 481                         $tokenFunctions = $this->getTokenFunctions();
 482                         foreach ( $this->token as $t ) {
 483                                 $val = call_user_func( $tokenFunctions[$t], $title->getArticleID(), $title, $revision );
 484                                 if ( $val === false ) {
 485                                         $this->setWarning( "Action '$t' is not allowed for the current user" );
 486                                 } else {
 487                                         $vals[$t . 'token'] = $val;
 488                                 }
 489                         }
 490                 }
 491
 492                 $content = null;
 493                 global $wgParser;
 494                 if ( $this->fld_content || !is_null( $this->difftotext ) ) {
 495                         $content = $revision->getContent();
 496                         // Expand templates after getting section content because
 497                         // template-added sections don't count and Parser::preprocess()
 498                         // will have less input
 499                         if ( $this->section !== false ) {
 500                                 $content = $content->getSection( $this->section, false );
 501                                 if ( !$content ) {
 502                                         $this->dieUsage( "There is no section {$this->section} in r" . $revision->getId(), 'nosuchsection' );
 503                                 }
 504                         }
 505                 }
 506                 if ( $this->fld_content && !$revision->isDeleted( Revision::DELETED_TEXT ) ) {
 507                         $text = null;
 508
 509                         if ( $this->generateXML ) {
 510                                 if ( $content->getModel() === CONTENT_MODEL_WIKITEXT ) {
 511                                         $t = $content->getNativeData(); # note: don't set $text
 512
 513                                         $wgParser->startExternalParse( $title, ParserOptions::newFromContext( $this->getContext() ), OT_PREPROCESS );
 514                                         $dom = $wgParser->preprocessToDom( $t );
 515                                         if ( is_callable( array( $dom, 'saveXML' ) ) ) {
 516                                                 $xml = $dom->saveXML();
 517                                         } else {
 518                                                 $xml = $dom->__toString();
 519                                         }
 520                                         $vals['parsetree'] = $xml;
 521                                 } else {
 522                                         $this->setWarning( "Conversion to XML is supported for wikitext only, " .
 523                                                                                 $title->getPrefixedDBkey() .
 524                                                                                 " uses content model " . $content->getModel() . ")" );
 525                                 }
 526                         }
 527
 528                         if ( $this->expandTemplates && !$this->parseContent ) {
 529                                 #XXX: implement template expansion for all content types in ContentHandler?
 530                                 if ( $content->getModel() === CONTENT_MODEL_WIKITEXT ) {
 531                                         $text = $content->getNativeData();
 532
 533                                         $text = $wgParser->preprocess( $text, $title, ParserOptions::newFromContext( $this->getContext() ) );
 534                                 } else {
 535                                         $this->setWarning( "Template expansion is supported for wikitext only, " .
 536                                                 $title->getPrefixedDBkey() .
 537                                                 " uses content model " . $content->getModel() . ")" );
 538
 539                                         $text = false;
 540                                 }
 541                         }
 542                         if ( $this->parseContent ) {
 543                                 $po = $content->getParserOutput( $title, $revision->getId(), ParserOptions::newFromContext( $this->getContext() ) );
 544                                 $text = $po->getText();
 545                         }
 546
 547                         if ( $text === null ) {
 548                                 $format = $this->contentFormat ? $this->contentFormat : $content->getDefaultFormat();
 549
 550                                 if ( !$content->isSupportedFormat( $format ) ) {
 551                                         $model = $content->getModel();
 552                                         $name = $title->getPrefixedDBkey();
 553
 554                                         $this->dieUsage( "The requested format {$this->contentFormat} is not supported ".
 555                                                                         "for content model $model used by $name", 'badformat' );
 556                                 }
 557
 558                                 $text = $content->serialize( $format );
 559                                 $vals['contentformat'] = $format;
 560                         }
 561
 562                         if ( $text !== false ) {
 563                                 ApiResult::setContent( $vals, $text );
 564                         }
 565                 } elseif ( $this->fld_content ) {
 566                         $vals['texthidden'] = '';
 567                 }
 568
 569                 if ( !is_null( $this->diffto ) || !is_null( $this->difftotext ) ) {
 570                         global $wgAPIMaxUncachedDiffs;
 571                         static $n = 0; // Number of uncached diffs we've had
 572                         if ( $n < $wgAPIMaxUncachedDiffs ) {
 573                                 $vals['diff'] = array();
 574                                 $context = new DerivativeContext( $this->getContext() );
 575                                 $context->setTitle( $title );
 576                                 $handler = $revision->getContentHandler();
 577
 578                                 if ( !is_null( $this->difftotext ) ) {
 579                                         $model = $title->getContentModel();
 580
 581                                         if ( $this->contentFormat
 582                                                 && !ContentHandler::getForModelID( $model )->isSupportedFormat( $this->contentFormat ) ) {
 583
 584                                                 $name = $title->getPrefixedDBkey();
 585
 586                                                 $this->dieUsage( "The requested format {$this->contentFormat} is not supported for ".
 587                                                                                         "content model $model used by $name", 'badformat' );
 588                                         }
 589
 590                                         $difftocontent = ContentHandler::makeContent( $this->difftotext, $title, $model, $this->contentFormat );
 591
 592                                         $engine = $handler->createDifferenceEngine( $context );
 593                                         $engine->setContent( $content, $difftocontent );
 594                                 } else {
 595                                         $engine = $handler->createDifferenceEngine( $context, $revision->getID(), $this->diffto );
 596                                         $vals['diff']['from'] = $engine->getOldid();
 597                                         $vals['diff']['to'] = $engine->getNewid();
 598                                 }
 599                                 $difftext = $engine->getDiffBody();
 600                                 ApiResult::setContent( $vals['diff'], $difftext );
 601                                 if ( !$engine->wasCacheHit() ) {
 602                                         $n++;
 603                                 }
 604                         } else {
 605                                 $vals['diff']['notcached'] = '';
 606                         }
 607                 }
 608                 return $vals;
 609         }
 610
 611         public function getCacheMode( $params ) {
 612                 if ( isset( $params['token'] ) ) {
 613                         return 'private';
 614                 }
 615                 if ( !is_null( $params['prop'] ) && in_array( 'parsedcomment', $params['prop'] ) ) {
 616                         // formatComment() calls wfMessage() among other things
 617                         return 'anon-public-user-private';
 618                 }
 619                 return 'public';
 620         }
 621
 622         public function getAllowedParams() {
 623                 return array(
 624                         'prop' => array(
 625                                 ApiBase::PARAM_ISMULTI => true,
 626                                 ApiBase::PARAM_DFLT => 'ids|timestamp|flags|comment|user',
 627                                 ApiBase::PARAM_TYPE => array(
 628                                         'ids',
 629                                         'flags',
 630                                         'timestamp',
 631                                         'user',
 632                                         'userid',
 633                                         'size',
 634                                         'sha1',
 635                                         'contentmodel',
 636                                         'comment',
 637                                         'parsedcomment',
 638                                         'content',
 639                                         'tags'
 640                                 )
 641                         ),
 642                         'limit' => array(
 643                                 ApiBase::PARAM_TYPE => 'limit',
 644                                 ApiBase::PARAM_MIN => 1,
 645                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 646                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 647                         ),
 648                         'startid' => array(
 649                                 ApiBase::PARAM_TYPE => 'integer'
 650                         ),
 651                         'endid' => array(
 652                                 ApiBase::PARAM_TYPE => 'integer'
 653                         ),
 654                         'start' => array(
 655                                 ApiBase::PARAM_TYPE => 'timestamp'
 656                         ),
 657                         'end' => array(
 658                                 ApiBase::PARAM_TYPE => 'timestamp'
 659                         ),
 660                         'dir' => array(
 661                                 ApiBase::PARAM_DFLT => 'older',
 662                                 ApiBase::PARAM_TYPE => array(
 663                                         'newer',
 664                                         'older'
 665                                 )
 666                         ),
 667                         'user' => array(
 668                                 ApiBase::PARAM_TYPE => 'user'
 669                         ),
 670                         'excludeuser' => array(
 671                                 ApiBase::PARAM_TYPE => 'user'
 672                         ),
 673                         'tag' => null,
 674                         'expandtemplates' => false,
 675                         'generatexml' => false,
 676                         'parse' => false,
 677                         'section' => null,
 678                         'token' => array(
 679                                 ApiBase::PARAM_TYPE => array_keys( $this->getTokenFunctions() ),
 680                                 ApiBase::PARAM_ISMULTI => true
 681                         ),
 682                         'continue' => null,
 683                         'diffto' => null,
 684                         'difftotext' => null,
 685                         'contentformat' => array(
 686                                 ApiBase::PARAM_TYPE => ContentHandler::getAllContentFormats(),
 687                                 ApiBase::PARAM_DFLT => null
 688                         ),
 689                 );
 690         }
 691
 692         public function getParamDescription() {
 693                 $p = $this->getModulePrefix();
 694                 return array(
 695                         'prop' => array(
 696                                 'Which properties to get for each revision:',
 697                                 ' ids            - The ID of the revision',
 698                                 ' flags          - Revision flags (minor)',
 699                                 ' timestamp      - The timestamp of the revision',
 700                                 ' user           - User that made the revision',
 701                                 ' userid         - User id of revision creator',
 702                                 ' size           - Length (bytes) of the revision',
 703                                 ' sha1           - SHA-1 (base 16) of the revision',
 704                                 ' contentmodel   - Content model id',
 705                                 ' comment        - Comment by the user for revision',
 706                                 ' parsedcomment  - Parsed comment by the user for the revision',
 707                                 ' content        - Text of the revision',
 708                                 ' tags           - Tags for the revision',
 709                         ),
 710                         'limit' => 'Limit how many revisions will be returned (enum)',
 711                         'startid' => 'From which revision id to start enumeration (enum)',
 712                         'endid' => 'Stop revision enumeration on this revid (enum)',
 713                         'start' => 'From which revision timestamp to start enumeration (enum)',
 714                         'end' => 'Enumerate up to this timestamp (enum)',
 715                         'dir' => $this->getDirectionDescription( $p, ' (enum)' ),
 716                         'user' => 'Only include revisions made by user (enum)',
 717                         'excludeuser' => 'Exclude revisions made by user (enum)',
 718                         'expandtemplates' => "Expand templates in revision content (requires {$p}prop=content)",
 719                         'generatexml' => "Generate XML parse tree for revision content (requires {$p}prop=content)",
 720                         'parse' => array( "Parse revision content (requires {$p}prop=content).",
 721                                 'For performance reasons if this option is used, rvlimit is enforced to 1.' ),
 722                         'section' => 'Only retrieve the content of this section number',
 723                         'token' => 'Which tokens to obtain for each revision',
 724                         'continue' => 'When more results are available, use this to continue',
 725                         'diffto' => array( 'Revision ID to diff each revision to.',
 726                                 'Use "prev", "next" and "cur" for the previous, next and current revision respectively' ),
 727                         'difftotext' => array( 'Text to diff each revision to. Only diffs a limited number of revisions.',
 728                                 "Overrides {$p}diffto. If {$p}section is set, only that section will be diffed against this text" ),
 729                         'tag' => 'Only list revisions tagged with this tag',
 730                         'contentformat' => 'Serialization format used for difftotext and expected for output of content',
 731                 );
 732         }
 733
 734         public function getResultProperties() {
 735                 $props = array(
 736                         '' => array(),
 737                         'ids' => array(
 738                                 'revid' => 'integer',
 739                                 'parentid' => array(
 740                                         ApiBase::PROP_TYPE => 'integer',
 741                                         ApiBase::PROP_NULLABLE => true
 742                                 )
 743                         ),
 744                         'flags' => array(
 745                                 'minor' => 'boolean'
 746                         ),
 747                         'user' => array(
 748                                 'userhidden' => 'boolean',
 749                                 'user' => 'string',
 750                                 'anon' => 'boolean'
 751                         ),
 752                         'userid' => array(
 753                                 'userhidden' => 'boolean',
 754                                 'userid' => 'integer',
 755                                 'anon' => 'boolean'
 756                         ),
 757                         'timestamp' => array(
 758                                 'timestamp' => 'timestamp'
 759                         ),
 760                         'size' => array(
 761                                 'size' => 'integer'
 762                         ),
 763                         'sha1' => array(
 764                                 'sha1' => 'string'
 765                         ),
 766                         'comment' => array(
 767                                 'commenthidden' => 'boolean',
 768                                 'comment' => array(
 769                                         ApiBase::PROP_TYPE => 'string',
 770                                         ApiBase::PROP_NULLABLE => true
 771                                 )
 772                         ),
 773                         'parsedcomment' => array(
 774                                 'commenthidden' => 'boolean',
 775                                 'parsedcomment' => array(
 776                                         ApiBase::PROP_TYPE => 'string',
 777                                         ApiBase::PROP_NULLABLE => true
 778                                 )
 779                         ),
 780                         'content' => array(
 781                                 '*' => array(
 782                                         ApiBase::PROP_TYPE => 'string',
 783                                         ApiBase::PROP_NULLABLE => true
 784                                 ),
 785                                 'texthidden' => 'boolean'
 786                         )
 787                 );
 788
 789                 self::addTokenProperties( $props, $this->getTokenFunctions() );
 790
 791                 return $props;
 792         }
 793
 794         public function getDescription() {
 795                 return array(
 796                         'Get revision information',
 797                         'May be used in several ways:',
 798                         ' 1) Get data about a set of pages (last revision), by setting titles or pageids parameter',
 799                         ' 2) Get revisions for one given page, by using titles/pageids with start/end/limit params',
 800                         ' 3) Get data about a set of revisions by setting their IDs with revids parameter',
 801                         'All parameters marked as (enum) may only be used with a single page (#2)'
 802                 );
 803         }
 804
 805         public function getPossibleErrors() {
 806                 return array_merge( parent::getPossibleErrors(), array(
 807                         array( 'nosuchrevid', 'diffto' ),
 808                         array( 'code' => 'revids', 'info' => 'The revids= parameter may not be used with the list options '
 809                                         . '(limit, startid, endid, dirNewer, start, end).' ),
 810                         array( 'code' => 'multpages', 'info' => 'titles, pageids or a generator was used to supply multiple pages, '
 811                                         . ' but the limit, startid, endid, dirNewer, user, excludeuser, '
 812                                         . 'start and end parameters may only be used on a single page.' ),
 813                         array( 'code' => 'diffto', 'info' => 'rvdiffto must be set to a non-negative number, "prev", "next" or "cur"' ),
 814                         array( 'code' => 'badparams', 'info' => 'start and startid cannot be used together' ),
 815                         array( 'code' => 'badparams', 'info' => 'end and endid cannot be used together' ),
 816                         array( 'code' => 'badparams', 'info' => 'user and excludeuser cannot be used together' ),
 817                         array( 'code' => 'nosuchsection', 'info' => 'There is no section section in rID' ),
 818                         array( 'code' => 'badformat', 'info' => 'The requested serialization format can not be applied '
 819                                                                                                         . ' to the page\'s content model' ),
 820                 ) );
 821         }
 822
 823         public function getExamples() {
 824                 return array(
 825                         'Get data with content for the last revision of titles "API" and "Main Page"',
 826                         '  api.php?action=query&prop=revisions&titles=API|Main%20Page&rvprop=timestamp|user|comment|content',
 827                         'Get last 5 revisions of the "Main Page"',
 828                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment',
 829                         'Get first 5 revisions of the "Main Page"',
 830                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvdir=newer',
 831                         'Get first 5 revisions of the "Main Page" made after 2006-05-01',
 832                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvdir=newer&rvstart=20060501000000',
 833                         'Get first 5 revisions of the "Main Page" that were not made made by anonymous user "127.0.0.1"',
 834                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvexcludeuser=127.0.0.1',
 835                         'Get first 5 revisions of the "Main Page" that were made by the user "MediaWiki default"',
 836                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvuser=MediaWiki%20default',
 837                 );
 838         }
 839
 840         public function getHelpUrls() {
 841                 return 'https://www.mediawiki.org/wiki/API:Properties#revisions_.2F_rv';
 842         }
 843
 844         public function getVersion() {
 845                 return __CLASS__ . ': $Id$';
 846         }
 847 }