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
  29  * of multiple pages. Various pieces of information may be shown - flags,
  30  * comments, and the actual wiki markup of the rev. In the enumeration mode,
  31  * ranges of revisions may be requested and filtered.
  32  *
  33  * @ingroup API
  34  */
  35 class ApiQueryRevisions extends ApiQueryBase {
  36
  37         private $diffto, $difftotext, $expandTemplates, $generateXML, $section,
  38                 $token, $parseContent, $contentFormat;
  39
  40         public function __construct( ApiQuery $query, $moduleName ) {
  41                 parent::__construct( $query, $moduleName, 'rv' );
  42         }
  43
  44         private $fld_ids = false, $fld_flags = false, $fld_timestamp = false,
  45                 $fld_size = false, $fld_sha1 = false, $fld_comment = false,
  46                 $fld_parsedcomment = false, $fld_user = false, $fld_userid = false,
  47                 $fld_content = false, $fld_tags = false, $fld_contentmodel = false;
  48
  49         private $tokenFunctions;
  50
  51         protected function getTokenFunctions() {
  52                 // tokenname => function
  53                 // function prototype is func($pageid, $title, $rev)
  54                 // should return token or false
  55
  56                 // Don't call the hooks twice
  57                 if ( isset( $this->tokenFunctions ) ) {
  58                         return $this->tokenFunctions;
  59                 }
  60
  61                 // If we're in JSON callback mode, no tokens can be obtained
  62                 if ( !is_null( $this->getMain()->getRequest()->getVal( 'callback' ) ) ) {
  63                         return array();
  64                 }
  65
  66                 $this->tokenFunctions = array(
  67                         'rollback' => array( 'ApiQueryRevisions', 'getRollbackToken' )
  68                 );
  69                 wfRunHooks( 'APIQueryRevisionsTokens', array( &$this->tokenFunctions ) );
  70
  71                 return $this->tokenFunctions;
  72         }
  73
  74         /**
  75          * @param int $pageid
  76          * @param Title $title
  77          * @param Revision $rev
  78          * @return bool|string
  79          */
  80         public static function getRollbackToken( $pageid, $title, $rev ) {
  81                 global $wgUser;
  82                 if ( !$wgUser->isAllowed( 'rollback' ) ) {
  83                         return false;
  84                 }
  85
  86                 return $wgUser->getEditToken(
  87                         array( $title->getPrefixedText(), $rev->getUserText() ) );
  88         }
  89
  90         public function execute() {
  91                 $params = $this->extractRequestParams( false );
  92
  93                 // If any of those parameters are used, work in 'enumeration' mode.
  94                 // Enum mode can only be used when exactly one page is provided.
  95                 // Enumerating revisions on multiple pages make it extremely
  96                 // difficult to manage continuations and require additional SQL indexes
  97                 $enumRevMode = ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ||
  98                         !is_null( $params['limit'] ) || !is_null( $params['startid'] ) ||
  99                         !is_null( $params['endid'] ) || $params['dir'] === 'newer' ||
 100                         !is_null( $params['start'] ) || !is_null( $params['end'] ) );
 101
 102                 $pageSet = $this->getPageSet();
 103                 $pageCount = $pageSet->getGoodTitleCount();
 104                 $revCount = $pageSet->getRevisionCount();
 105
 106                 // Optimization -- nothing to do
 107                 if ( $revCount === 0 && $pageCount === 0 ) {
 108                         return;
 109                 }
 110
 111                 if ( $revCount > 0 && $enumRevMode ) {
 112                         $this->dieUsage(
 113                                 'The revids= parameter may not be used with the list options ' .
 114                                         '(limit, startid, endid, dirNewer, start, end).',
 115                                 'revids'
 116                         );
 117                 }
 118
 119                 if ( $pageCount > 1 && $enumRevMode ) {
 120                         $this->dieUsage(
 121                                 'titles, pageids or a generator was used to supply multiple pages, ' .
 122                                         'but the limit, startid, endid, dirNewer, user, excludeuser, start ' .
 123                                         'and end parameters may only be used on a single page.',
 124                                 'multpages'
 125                         );
 126                 }
 127
 128                 if ( !is_null( $params['difftotext'] ) ) {
 129                         $this->difftotext = $params['difftotext'];
 130                 } elseif ( !is_null( $params['diffto'] ) ) {
 131                         if ( $params['diffto'] == 'cur' ) {
 132                                 $params['diffto'] = 0;
 133                         }
 134                         if ( ( !ctype_digit( $params['diffto'] ) || $params['diffto'] < 0 )
 135                                 && $params['diffto'] != 'prev' && $params['diffto'] != 'next'
 136                         ) {
 137                                 $this->dieUsage(
 138                                         'rvdiffto must be set to a non-negative number, "prev", "next" or "cur"',
 139                                         'diffto'
 140                                 );
 141                         }
 142                         // Check whether the revision exists and is readable,
 143                         // DifferenceEngine returns a rather ambiguous empty
 144                         // string if that's not the case
 145                         if ( $params['diffto'] != 0 ) {
 146                                 $difftoRev = Revision::newFromID( $params['diffto'] );
 147                                 if ( !$difftoRev ) {
 148                                         $this->dieUsageMsg( array( 'nosuchrevid', $params['diffto'] ) );
 149                                 }
 150                                 if ( !$difftoRev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 151                                         $this->setWarning( "Couldn't diff to r{$difftoRev->getID()}: content is hidden" );
 152                                         $params['diffto'] = null;
 153                                 }
 154                         }
 155                         $this->diffto = $params['diffto'];
 156                 }
 157
 158                 $db = $this->getDB();
 159                 $this->addTables( 'page' );
 160                 $this->addFields( Revision::selectFields() );
 161                 $this->addWhere( 'page_id = rev_page' );
 162
 163                 $prop = array_flip( $params['prop'] );
 164
 165                 // Optional fields
 166                 $this->fld_ids = isset( $prop['ids'] );
 167                 // $this->addFieldsIf('rev_text_id', $this->fld_ids); // should this be exposed?
 168                 $this->fld_flags = isset( $prop['flags'] );
 169                 $this->fld_timestamp = isset( $prop['timestamp'] );
 170                 $this->fld_comment = isset( $prop['comment'] );
 171                 $this->fld_parsedcomment = isset( $prop['parsedcomment'] );
 172                 $this->fld_size = isset( $prop['size'] );
 173                 $this->fld_sha1 = isset( $prop['sha1'] );
 174                 $this->fld_contentmodel = isset( $prop['contentmodel'] );
 175                 $this->fld_userid = isset( $prop['userid'] );
 176                 $this->fld_user = isset( $prop['user'] );
 177                 $this->token = $params['token'];
 178
 179                 if ( !empty( $params['contentformat'] ) ) {
 180                         $this->contentFormat = $params['contentformat'];
 181                 }
 182
 183                 $userMax = ( $this->fld_content ? ApiBase::LIMIT_SML1 : ApiBase::LIMIT_BIG1 );
 184                 $botMax = ( $this->fld_content ? ApiBase::LIMIT_SML2 : ApiBase::LIMIT_BIG2 );
 185                 $limit = $params['limit'];
 186                 if ( $limit == 'max' ) {
 187                         $limit = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 188                         $this->getResult()->setParsedLimit( $this->getModuleName(), $limit );
 189                 }
 190
 191                 if ( !is_null( $this->token ) || $pageCount > 0 ) {
 192                         $this->addFields( Revision::selectPageFields() );
 193                 }
 194
 195                 if ( isset( $prop['tags'] ) ) {
 196                         $this->fld_tags = true;
 197                         $this->addTables( 'tag_summary' );
 198                         $this->addJoinConds(
 199                                 array( 'tag_summary' => array( 'LEFT JOIN', array( 'rev_id=ts_rev_id' ) ) )
 200                         );
 201                         $this->addFields( 'ts_tags' );
 202                 }
 203
 204                 if ( !is_null( $params['tag'] ) ) {
 205                         $this->addTables( 'change_tag' );
 206                         $this->addJoinConds(
 207                                 array( 'change_tag' => array( 'INNER JOIN', array( 'rev_id=ct_rev_id' ) ) )
 208                         );
 209                         $this->addWhereFld( 'ct_tag', $params['tag'] );
 210                 }
 211
 212                 if ( isset( $prop['content'] ) || !is_null( $this->diffto ) || !is_null( $this->difftotext ) ) {
 213                         // For each page we will request, the user must have read rights for that page
 214                         $user = $this->getUser();
 215                         /** @var $title Title */
 216                         foreach ( $pageSet->getGoodTitles() as $title ) {
 217                                 if ( !$title->userCan( 'read', $user ) ) {
 218                                         $this->dieUsage(
 219                                                 'The current user is not allowed to read ' . $title->getPrefixedText(),
 220                                                 'accessdenied' );
 221                                 }
 222                         }
 223
 224                         $this->addTables( 'text' );
 225                         $this->addWhere( 'rev_text_id=old_id' );
 226                         $this->addFields( 'old_id' );
 227                         $this->addFields( Revision::selectTextFields() );
 228
 229                         $this->fld_content = isset( $prop['content'] );
 230
 231                         $this->expandTemplates = $params['expandtemplates'];
 232                         $this->generateXML = $params['generatexml'];
 233                         $this->parseContent = $params['parse'];
 234                         if ( $this->parseContent ) {
 235                                 // Must manually initialize unset limit
 236                                 if ( is_null( $limit ) ) {
 237                                         $limit = 1;
 238                                 }
 239                                 // We are only going to parse 1 revision per request
 240                                 $this->validateLimit( 'limit', $limit, 1, 1, 1 );
 241                         }
 242                         if ( isset( $params['section'] ) ) {
 243                                 $this->section = $params['section'];
 244                         } else {
 245                                 $this->section = false;
 246                         }
 247                 }
 248
 249                 // add user name, if needed
 250                 if ( $this->fld_user ) {
 251                         $this->addTables( 'user' );
 252                         $this->addJoinConds( array( 'user' => Revision::userJoinCond() ) );
 253                         $this->addFields( Revision::selectUserFields() );
 254                 }
 255
 256                 // Bug 24166 - API error when using rvprop=tags
 257                 $this->addTables( 'revision' );
 258
 259                 if ( $enumRevMode ) {
 260                         // This is mostly to prevent parameter errors (and optimize SQL?)
 261                         if ( !is_null( $params['startid'] ) && !is_null( $params['start'] ) ) {
 262                                 $this->dieUsage( 'start and startid cannot be used together', 'badparams' );
 263                         }
 264
 265                         if ( !is_null( $params['endid'] ) && !is_null( $params['end'] ) ) {
 266                                 $this->dieUsage( 'end and endid cannot be used together', 'badparams' );
 267                         }
 268
 269                         if ( !is_null( $params['user'] ) && !is_null( $params['excludeuser'] ) ) {
 270                                 $this->dieUsage( 'user and excludeuser cannot be used together', 'badparams' );
 271                         }
 272
 273                         // Continuing effectively uses startid. But we can't use rvstartid
 274                         // directly, because there is no way to tell the client to ''not''
 275                         // send rvstart if it sent it in the original query. So instead we
 276                         // send the continuation startid as rvcontinue, and ignore both
 277                         // rvstart and rvstartid when that is supplied.
 278                         if ( !is_null( $params['continue'] ) ) {
 279                                 $params['startid'] = $params['continue'];
 280                                 $params['start'] = null;
 281                         }
 282
 283                         // This code makes an assumption that sorting by rev_id and rev_timestamp produces
 284                         // the same result. This way users may request revisions starting at a given time,
 285                         // but to page through results use the rev_id returned after each page.
 286                         // Switching to rev_id removes the potential problem of having more than
 287                         // one row with the same timestamp for the same page.
 288                         // The order needs to be the same as start parameter to avoid SQL filesort.
 289                         if ( is_null( $params['startid'] ) && is_null( $params['endid'] ) ) {
 290                                 $this->addTimestampWhereRange( 'rev_timestamp', $params['dir'],
 291                                         $params['start'], $params['end'] );
 292                         } else {
 293                                 $this->addWhereRange( 'rev_id', $params['dir'],
 294                                         $params['startid'], $params['endid'] );
 295                                 // One of start and end can be set
 296                                 // If neither is set, this does nothing
 297                                 $this->addTimestampWhereRange( 'rev_timestamp', $params['dir'],
 298                                         $params['start'], $params['end'], false );
 299                         }
 300
 301                         // must manually initialize unset limit
 302                         if ( is_null( $limit ) ) {
 303                                 $limit = 10;
 304                         }
 305                         $this->validateLimit( 'limit', $limit, 1, $userMax, $botMax );
 306
 307                         // There is only one ID, use it
 308                         $ids = array_keys( $pageSet->getGoodTitles() );
 309                         $this->addWhereFld( 'rev_page', reset( $ids ) );
 310
 311                         if ( !is_null( $params['user'] ) ) {
 312                                 $this->addWhereFld( 'rev_user_text', $params['user'] );
 313                         } elseif ( !is_null( $params['excludeuser'] ) ) {
 314                                 $this->addWhere( 'rev_user_text != ' .
 315                                         $db->addQuotes( $params['excludeuser'] ) );
 316                         }
 317                         if ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ) {
 318                                 // Paranoia: avoid brute force searches (bug 17342)
 319                                 if ( !$this->getUser()->isAllowed( 'deletedhistory' ) ) {
 320                                         $bitmask = Revision::DELETED_USER;
 321                                 } elseif ( !$this->getUser()->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
 322                                         $bitmask = Revision::DELETED_USER | Revision::DELETED_RESTRICTED;
 323                                 } else {
 324                                         $bitmask = 0;
 325                                 }
 326                                 if ( $bitmask ) {
 327                                         $this->addWhere( $db->bitAnd( 'rev_deleted', $bitmask ) . " != $bitmask" );
 328                                 }
 329                         }
 330                 } elseif ( $revCount > 0 ) {
 331                         $max = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 332                         $revs = $pageSet->getRevisionIDs();
 333                         if ( self::truncateArray( $revs, $max ) ) {
 334                                 $this->setWarning( "Too many values supplied for parameter 'revids': the limit is $max" );
 335                         }
 336
 337                         // Get all revision IDs
 338                         $this->addWhereFld( 'rev_id', array_keys( $revs ) );
 339
 340                         if ( !is_null( $params['continue'] ) ) {
 341                                 $this->addWhere( 'rev_id >= ' . intval( $params['continue'] ) );
 342                         }
 343                         $this->addOption( 'ORDER BY', 'rev_id' );
 344
 345                         // assumption testing -- we should never get more then $revCount rows.
 346                         $limit = $revCount;
 347                 } elseif ( $pageCount > 0 ) {
 348                         $max = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
 349                         $titles = $pageSet->getGoodTitles();
 350                         if ( self::truncateArray( $titles, $max ) ) {
 351                                 $this->setWarning( "Too many values supplied for parameter 'titles': the limit is $max" );
 352                         }
 353
 354                         // When working in multi-page non-enumeration mode,
 355                         // limit to the latest revision only
 356                         $this->addWhere( 'page_id=rev_page' );
 357                         $this->addWhere( 'page_latest=rev_id' );
 358
 359                         // Get all page IDs
 360                         $this->addWhereFld( 'page_id', array_keys( $titles ) );
 361                         // Every time someone relies on equality propagation, god kills a kitten :)
 362                         $this->addWhereFld( 'rev_page', array_keys( $titles ) );
 363
 364                         if ( !is_null( $params['continue'] ) ) {
 365                                 $cont = explode( '|', $params['continue'] );
 366                                 $this->dieContinueUsageIf( count( $cont ) != 2 );
 367                                 $pageid = intval( $cont[0] );
 368                                 $revid = intval( $cont[1] );
 369                                 $this->addWhere(
 370                                         "rev_page > $pageid OR " .
 371                                         "(rev_page = $pageid AND " .
 372                                         "rev_id >= $revid)"
 373                                 );
 374                         }
 375                         $this->addOption( 'ORDER BY', array(
 376                                 'rev_page',
 377                                 'rev_id'
 378                         ) );
 379
 380                         // assumption testing -- we should never get more then $pageCount rows.
 381                         $limit = $pageCount;
 382                 } else {
 383                         ApiBase::dieDebug( __METHOD__, 'param validation?' );
 384                 }
 385
 386                 $this->addOption( 'LIMIT', $limit + 1 );
 387
 388                 $count = 0;
 389                 $res = $this->select( __METHOD__ );
 390
 391                 foreach ( $res as $row ) {
 392                         if ( ++$count > $limit ) {
 393                                 // We've reached the one extra which shows that there are
 394                                 // additional pages to be had. Stop here...
 395                                 if ( !$enumRevMode ) {
 396                                         ApiBase::dieDebug( __METHOD__, 'Got more rows then expected' ); // bug report
 397                                 }
 398                                 $this->setContinueEnumParameter( 'continue', intval( $row->rev_id ) );
 399                                 break;
 400                         }
 401
 402                         $fit = $this->addPageSubItem( $row->rev_page, $this->extractRowInfo( $row ), 'rev' );
 403                         if ( !$fit ) {
 404                                 if ( $enumRevMode ) {
 405                                         $this->setContinueEnumParameter( 'continue', intval( $row->rev_id ) );
 406                                 } elseif ( $revCount > 0 ) {
 407                                         $this->setContinueEnumParameter( 'continue', intval( $row->rev_id ) );
 408                                 } else {
 409                                         $this->setContinueEnumParameter( 'continue', intval( $row->rev_page ) .
 410                                                 '|' . intval( $row->rev_id ) );
 411                                 }
 412                                 break;
 413                         }
 414                 }
 415         }
 416
 417         private function extractRowInfo( $row ) {
 418                 $revision = new Revision( $row );
 419                 $title = $revision->getTitle();
 420                 $user = $this->getUser();
 421                 $vals = array();
 422                 $anyHidden = false;
 423
 424                 if ( $this->fld_ids ) {
 425                         $vals['revid'] = intval( $revision->getId() );
 426                         // $vals['oldid'] = intval( $row->rev_text_id ); // todo: should this be exposed?
 427                         if ( !is_null( $revision->getParentId() ) ) {
 428                                 $vals['parentid'] = intval( $revision->getParentId() );
 429                         }
 430                 }
 431
 432                 if ( $this->fld_flags && $revision->isMinor() ) {
 433                         $vals['minor'] = '';
 434                 }
 435
 436                 if ( $this->fld_user || $this->fld_userid ) {
 437                         if ( $revision->isDeleted( Revision::DELETED_USER ) ) {
 438                                 $vals['userhidden'] = '';
 439                                 $anyHidden = true;
 440                         }
 441                         if ( $revision->userCan( Revision::DELETED_USER, $user ) ) {
 442                                 if ( $this->fld_user ) {
 443                                         $vals['user'] = $revision->getRawUserText();
 444                                 }
 445                                 $userid = $revision->getRawUser();
 446                                 if ( !$userid ) {
 447                                         $vals['anon'] = '';
 448                                 }
 449
 450                                 if ( $this->fld_userid ) {
 451                                         $vals['userid'] = $userid;
 452                                 }
 453                         }
 454                 }
 455
 456                 if ( $this->fld_timestamp ) {
 457                         $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $revision->getTimestamp() );
 458                 }
 459
 460                 if ( $this->fld_size ) {
 461                         if ( !is_null( $revision->getSize() ) ) {
 462                                 $vals['size'] = intval( $revision->getSize() );
 463                         } else {
 464                                 $vals['size'] = 0;
 465                         }
 466                 }
 467
 468                 if ( $this->fld_sha1 ) {
 469                         if ( $revision->isDeleted( Revision::DELETED_TEXT ) ) {
 470                                 $vals['sha1hidden'] = '';
 471                                 $anyHidden = true;
 472                         }
 473                         if ( $revision->userCan( Revision::DELETED_TEXT, $user ) ) {
 474                                 if ( $revision->getSha1() != '' ) {
 475                                         $vals['sha1'] = wfBaseConvert( $revision->getSha1(), 36, 16, 40 );
 476                                 } else {
 477                                         $vals['sha1'] = '';
 478                                 }
 479                         }
 480                 }
 481
 482                 if ( $this->fld_contentmodel ) {
 483                         $vals['contentmodel'] = $revision->getContentModel();
 484                 }
 485
 486                 if ( $this->fld_comment || $this->fld_parsedcomment ) {
 487                         if ( $revision->isDeleted( Revision::DELETED_COMMENT ) ) {
 488                                 $vals['commenthidden'] = '';
 489                                 $anyHidden = true;
 490                         }
 491                         if ( $revision->userCan( Revision::DELETED_COMMENT, $user ) ) {
 492                                 $comment = $revision->getRawComment();
 493
 494                                 if ( $this->fld_comment ) {
 495                                         $vals['comment'] = $comment;
 496                                 }
 497
 498                                 if ( $this->fld_parsedcomment ) {
 499                                         $vals['parsedcomment'] = Linker::formatComment( $comment, $title );
 500                                 }
 501                         }
 502                 }
 503
 504                 if ( $this->fld_tags ) {
 505                         if ( $row->ts_tags ) {
 506                                 $tags = explode( ',', $row->ts_tags );
 507                                 $this->getResult()->setIndexedTagName( $tags, 'tag' );
 508                                 $vals['tags'] = $tags;
 509                         } else {
 510                                 $vals['tags'] = array();
 511                         }
 512                 }
 513
 514                 if ( !is_null( $this->token ) ) {
 515                         $tokenFunctions = $this->getTokenFunctions();
 516                         foreach ( $this->token as $t ) {
 517                                 $val = call_user_func( $tokenFunctions[$t], $title->getArticleID(), $title, $revision );
 518                                 if ( $val === false ) {
 519                                         $this->setWarning( "Action '$t' is not allowed for the current user" );
 520                                 } else {
 521                                         $vals[$t . 'token'] = $val;
 522                                 }
 523                         }
 524                 }
 525
 526                 $content = null;
 527                 global $wgParser;
 528                 if ( $this->fld_content || !is_null( $this->diffto ) || !is_null( $this->difftotext ) ) {
 529                         $content = $revision->getContent( Revision::FOR_THIS_USER, $this->getUser() );
 530                         // Expand templates after getting section content because
 531                         // template-added sections don't count and Parser::preprocess()
 532                         // will have less input
 533                         if ( $content && $this->section !== false ) {
 534                                 $content = $content->getSection( $this->section, false );
 535                                 if ( !$content ) {
 536                                         $this->dieUsage(
 537                                                 "There is no section {$this->section} in r" . $revision->getId(),
 538                                                 'nosuchsection'
 539                                         );
 540                                 }
 541                         }
 542                         if ( $revision->isDeleted( Revision::DELETED_TEXT ) ) {
 543                                 $vals['texthidden'] = '';
 544                                 $anyHidden = true;
 545                         } elseif ( !$content ) {
 546                                 $vals['textmissing'] = '';
 547                         }
 548                 }
 549                 if ( $this->fld_content && $content ) {
 550                         $text = null;
 551
 552                         if ( $this->generateXML ) {
 553                                 if ( $content->getModel() === CONTENT_MODEL_WIKITEXT ) {
 554                                         $t = $content->getNativeData(); # note: don't set $text
 555
 556                                         $wgParser->startExternalParse(
 557                                                 $title,
 558                                                 ParserOptions::newFromContext( $this->getContext() ),
 559                                                 OT_PREPROCESS
 560                                         );
 561                                         $dom = $wgParser->preprocessToDom( $t );
 562                                         if ( is_callable( array( $dom, 'saveXML' ) ) ) {
 563                                                 $xml = $dom->saveXML();
 564                                         } else {
 565                                                 $xml = $dom->__toString();
 566                                         }
 567                                         $vals['parsetree'] = $xml;
 568                                 } else {
 569                                         $this->setWarning( "Conversion to XML is supported for wikitext only, " .
 570                                                 $title->getPrefixedDBkey() .
 571                                                 " uses content model " . $content->getModel() );
 572                                 }
 573                         }
 574
 575                         if ( $this->expandTemplates && !$this->parseContent ) {
 576                                 #XXX: implement template expansion for all content types in ContentHandler?
 577                                 if ( $content->getModel() === CONTENT_MODEL_WIKITEXT ) {
 578                                         $text = $content->getNativeData();
 579
 580                                         $text = $wgParser->preprocess(
 581                                                 $text,
 582                                                 $title,
 583                                                 ParserOptions::newFromContext( $this->getContext() )
 584                                         );
 585                                 } else {
 586                                         $this->setWarning( "Template expansion is supported for wikitext only, " .
 587                                                 $title->getPrefixedDBkey() .
 588                                                 " uses content model " . $content->getModel() );
 589
 590                                         $text = false;
 591                                 }
 592                         }
 593                         if ( $this->parseContent ) {
 594                                 $po = $content->getParserOutput(
 595                                         $title,
 596                                         $revision->getId(),
 597                                         ParserOptions::newFromContext( $this->getContext() )
 598                                 );
 599                                 $text = $po->getText();
 600                         }
 601
 602                         if ( $text === null ) {
 603                                 $format = $this->contentFormat ? $this->contentFormat : $content->getDefaultFormat();
 604                                 $model = $content->getModel();
 605
 606                                 if ( !$content->isSupportedFormat( $format ) ) {
 607                                         $name = $title->getPrefixedDBkey();
 608
 609                                         $this->dieUsage( "The requested format {$this->contentFormat} is not supported " .
 610                                                 "for content model $model used by $name", 'badformat' );
 611                                 }
 612
 613                                 $text = $content->serialize( $format );
 614
 615                                 // always include format and model.
 616                                 // Format is needed to deserialize, model is needed to interpret.
 617                                 $vals['contentformat'] = $format;
 618                                 $vals['contentmodel'] = $model;
 619                         }
 620
 621                         if ( $text !== false ) {
 622                                 ApiResult::setContent( $vals, $text );
 623                         }
 624                 }
 625
 626                 if ( $content && ( !is_null( $this->diffto ) || !is_null( $this->difftotext ) ) ) {
 627                         static $n = 0; // Number of uncached diffs we've had
 628
 629                         if ( $n < $this->getConfig()->get( 'APIMaxUncachedDiffs' ) ) {
 630                                 $vals['diff'] = array();
 631                                 $context = new DerivativeContext( $this->getContext() );
 632                                 $context->setTitle( $title );
 633                                 $handler = $revision->getContentHandler();
 634
 635                                 if ( !is_null( $this->difftotext ) ) {
 636                                         $model = $title->getContentModel();
 637
 638                                         if ( $this->contentFormat
 639                                                 && !ContentHandler::getForModelID( $model )->isSupportedFormat( $this->contentFormat )
 640                                         ) {
 641
 642                                                 $name = $title->getPrefixedDBkey();
 643
 644                                                 $this->dieUsage( "The requested format {$this->contentFormat} is not supported for " .
 645                                                         "content model $model used by $name", 'badformat' );
 646                                         }
 647
 648                                         $difftocontent = ContentHandler::makeContent(
 649                                                 $this->difftotext,
 650                                                 $title,
 651                                                 $model,
 652                                                 $this->contentFormat
 653                                         );
 654
 655                                         $engine = $handler->createDifferenceEngine( $context );
 656                                         $engine->setContent( $content, $difftocontent );
 657                                 } else {
 658                                         $engine = $handler->createDifferenceEngine( $context, $revision->getID(), $this->diffto );
 659                                         $vals['diff']['from'] = $engine->getOldid();
 660                                         $vals['diff']['to'] = $engine->getNewid();
 661                                 }
 662                                 $difftext = $engine->getDiffBody();
 663                                 ApiResult::setContent( $vals['diff'], $difftext );
 664                                 if ( !$engine->wasCacheHit() ) {
 665                                         $n++;
 666                                 }
 667                         } else {
 668                                 $vals['diff']['notcached'] = '';
 669                         }
 670                 }
 671
 672                 if ( $anyHidden && $revision->isDeleted( Revision::DELETED_RESTRICTED ) ) {
 673                         $vals['suppressed'] = '';
 674                 }
 675
 676                 return $vals;
 677         }
 678
 679         public function getCacheMode( $params ) {
 680                 if ( isset( $params['token'] ) ) {
 681                         return 'private';
 682                 }
 683                 if ( $this->userCanSeeRevDel() ) {
 684                         return 'private';
 685                 }
 686                 if ( !is_null( $params['prop'] ) && in_array( 'parsedcomment', $params['prop'] ) ) {
 687                         // formatComment() calls wfMessage() among other things
 688                         return 'anon-public-user-private';
 689                 }
 690
 691                 return 'public';
 692         }
 693
 694         public function getAllowedParams() {
 695                 return array(
 696                         'prop' => array(
 697                                 ApiBase::PARAM_ISMULTI => true,
 698                                 ApiBase::PARAM_DFLT => 'ids|timestamp|flags|comment|user',
 699                                 ApiBase::PARAM_TYPE => array(
 700                                         'ids',
 701                                         'flags',
 702                                         'timestamp',
 703                                         'user',
 704                                         'userid',
 705                                         'size',
 706                                         'sha1',
 707                                         'contentmodel',
 708                                         'comment',
 709                                         'parsedcomment',
 710                                         'content',
 711                                         'tags'
 712                                 )
 713                         ),
 714                         'limit' => array(
 715                                 ApiBase::PARAM_TYPE => 'limit',
 716                                 ApiBase::PARAM_MIN => 1,
 717                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 718                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 719                         ),
 720                         'startid' => array(
 721                                 ApiBase::PARAM_TYPE => 'integer'
 722                         ),
 723                         'endid' => array(
 724                                 ApiBase::PARAM_TYPE => 'integer'
 725                         ),
 726                         'start' => array(
 727                                 ApiBase::PARAM_TYPE => 'timestamp'
 728                         ),
 729                         'end' => array(
 730                                 ApiBase::PARAM_TYPE => 'timestamp'
 731                         ),
 732                         'dir' => array(
 733                                 ApiBase::PARAM_DFLT => 'older',
 734                                 ApiBase::PARAM_TYPE => array(
 735                                         'newer',
 736                                         'older'
 737                                 )
 738                         ),
 739                         'user' => array(
 740                                 ApiBase::PARAM_TYPE => 'user'
 741                         ),
 742                         'excludeuser' => array(
 743                                 ApiBase::PARAM_TYPE => 'user'
 744                         ),
 745                         'tag' => null,
 746                         'expandtemplates' => false,
 747                         'generatexml' => false,
 748                         'parse' => false,
 749                         'section' => null,
 750                         'token' => array(
 751                                 ApiBase::PARAM_TYPE => array_keys( $this->getTokenFunctions() ),
 752                                 ApiBase::PARAM_ISMULTI => true
 753                         ),
 754                         'continue' => null,
 755                         'diffto' => null,
 756                         'difftotext' => null,
 757                         'contentformat' => array(
 758                                 ApiBase::PARAM_TYPE => ContentHandler::getAllContentFormats(),
 759                                 ApiBase::PARAM_DFLT => null
 760                         ),
 761                 );
 762         }
 763
 764         public function getParamDescription() {
 765                 $p = $this->getModulePrefix();
 766
 767                 return array(
 768                         'prop' => array(
 769                                 'Which properties to get for each revision:',
 770                                 ' ids            - The ID of the revision',
 771                                 ' flags          - Revision flags (minor)',
 772                                 ' timestamp      - The timestamp of the revision',
 773                                 ' user           - User that made the revision',
 774                                 ' userid         - User id of revision creator',
 775                                 ' size           - Length (bytes) of the revision',
 776                                 ' sha1           - SHA-1 (base 16) of the revision',
 777                                 ' contentmodel   - Content model id',
 778                                 ' comment        - Comment by the user for revision',
 779                                 ' parsedcomment  - Parsed comment by the user for the revision',
 780                                 ' content        - Text of the revision',
 781                                 ' tags           - Tags for the revision',
 782                         ),
 783                         'limit' => 'Limit how many revisions will be returned (enum)',
 784                         'startid' => 'From which revision id to start enumeration (enum)',
 785                         'endid' => 'Stop revision enumeration on this revid (enum)',
 786                         'start' => 'From which revision timestamp to start enumeration (enum)',
 787                         'end' => 'Enumerate up to this timestamp (enum)',
 788                         'dir' => $this->getDirectionDescription( $p, ' (enum)' ),
 789                         'user' => 'Only include revisions made by user (enum)',
 790                         'excludeuser' => 'Exclude revisions made by user (enum)',
 791                         'expandtemplates' => "Expand templates in revision content (requires {$p}prop=content)",
 792                         'generatexml' => "Generate XML parse tree for revision content (requires {$p}prop=content)",
 793                         'parse' => array( "Parse revision content (requires {$p}prop=content).",
 794                                 'For performance reasons if this option is used, rvlimit is enforced to 1.' ),
 795                         'section' => 'Only retrieve the content of this section number',
 796                         'token' => 'Which tokens to obtain for each revision',
 797                         'continue' => 'When more results are available, use this to continue',
 798                         'diffto' => array( 'Revision ID to diff each revision to.',
 799                                 'Use "prev", "next" and "cur" for the previous, next and current revision respectively' ),
 800                         'difftotext' => array(
 801                                 'Text to diff each revision to. Only diffs a limited number of revisions.',
 802                                 "Overrides {$p}diffto. If {$p}section is set, only that section will be",
 803                                 'diffed against this text',
 804                         ),
 805                         'tag' => 'Only list revisions tagged with this tag',
 806                         'contentformat' => 'Serialization format used for difftotext and expected for output of content',
 807                 );
 808         }
 809
 810         public function getDescription() {
 811                 return array(
 812                         'Get revision information.',
 813                         'May be used in several ways:',
 814                         ' 1) Get data about a set of pages (last revision), by setting titles or pageids parameter.',
 815                         ' 2) Get revisions for one given page, by using titles/pageids with start/end/limit params.',
 816                         ' 3) Get data about a set of revisions by setting their IDs with revids parameter.',
 817                         'All parameters marked as (enum) may only be used with a single page (#2).'
 818                 );
 819         }
 820
 821         public function getExamples() {
 822                 return array(
 823                         'Get data with content for the last revision of titles "API" and "Main Page"',
 824                         '  api.php?action=query&prop=revisions&titles=API|Main%20Page&' .
 825                                 'rvprop=timestamp|user|comment|content',
 826                         'Get last 5 revisions of the "Main Page"',
 827                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 828                                 '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&' .
 831                                 'rvprop=timestamp|user|comment&rvdir=newer',
 832                         'Get first 5 revisions of the "Main Page" made after 2006-05-01',
 833                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 834                                 'rvprop=timestamp|user|comment&rvdir=newer&rvstart=20060501000000',
 835                         'Get first 5 revisions of the "Main Page" that were not made made by anonymous user "127.0.0.1"',
 836                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 837                                 'rvprop=timestamp|user|comment&rvexcludeuser=127.0.0.1',
 838                         'Get first 5 revisions of the "Main Page" that were made by the user "MediaWiki default"',
 839                         '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&' .
 840                                 'rvprop=timestamp|user|comment&rvuser=MediaWiki%20default',
 841                 );
 842         }
 843
 844         public function getHelpUrls() {
 845                 return 'https://www.mediawiki.org/wiki/API:Properties#revisions_.2F_rv';
 846         }
 847 }