includes/WikiPage.php

   1 <?php
   2 /**
   3  * Base representation for a MediaWiki page.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Abstract class for type hinting (accepts WikiPage, Article, ImagePage, CategoryPage)
  25  */
  26 abstract class Page {}
  27
  28 /**
  29  * Class representing a MediaWiki article and history.
  30  *
  31  * Some fields are public only for backwards-compatibility. Use accessors.
  32  * In the past, this class was part of Article.php and everything was public.
  33  *
  34  * @internal documentation reviewed 15 Mar 2010
  35  */
  36 class WikiPage extends Page {
  37         // doDeleteArticleReal() return values. Values less than zero indicate fatal errors,
  38         // values greater than zero indicate that there were problems not resulting in page
  39         // not being deleted
  40
  41         /**
  42          * Delete operation aborted by hook
  43          */
  44         const DELETE_HOOK_ABORTED = -1;
  45
  46         /**
  47          * Deletion successful
  48          */
  49         const DELETE_SUCCESS = 0;
  50
  51         /**
  52          * Page not found
  53          */
  54         const DELETE_NO_PAGE = 1;
  55
  56         /**
  57          * No revisions found to delete
  58          */
  59         const DELETE_NO_REVISIONS = 2;
  60
  61         // Constants for $mDataLoadedFrom and related
  62
  63         /**
  64          * Data has not been loaded yet (or the object was cleared)
  65          */
  66         const DATA_NOT_LOADED = 0;
  67
  68         /**
  69          * Data has been loaded from a slave database
  70          */
  71         const DATA_FROM_SLAVE = 1;
  72
  73         /**
  74          * Data has been loaded from the master database
  75          */
  76         const DATA_FROM_MASTER = 2;
  77
  78         /**
  79          * Data has been loaded from the master database using FOR UPDATE
  80          */
  81         const DATA_FOR_UPDATE = 3;
  82
  83         /**
  84          * @var Title
  85          */
  86         public $mTitle = null;
  87
  88         /**@{{
  89          * @protected
  90          */
  91         public $mDataLoaded = false;         // !< Boolean
  92         public $mIsRedirect = false;         // !< Boolean
  93         public $mLatest = false;             // !< Integer (false means "not loaded")
  94         public $mPreparedEdit = false;       // !< Array
  95         /**@}}*/
  96
  97         /**
  98          * @var int; one of the DATA_* constants
  99          */
 100         protected $mDataLoadedFrom = self::DATA_NOT_LOADED;
 101
 102         /**
 103          * @var Title
 104          */
 105         protected $mRedirectTarget = null;
 106
 107         /**
 108          * @var Revision
 109          */
 110         protected $mLastRevision = null;
 111
 112         /**
 113          * @var string; timestamp of the current revision or empty string if not loaded
 114          */
 115         protected $mTimestamp = '';
 116
 117         /**
 118          * @var string
 119          */
 120         protected $mTouched = '19700101000000';
 121
 122         /**
 123          * @var int|null
 124          */
 125         protected $mCounter = null;
 126
 127         /**
 128          * Constructor and clear the article
 129          * @param $title Title Reference to a Title object.
 130          */
 131         public function __construct( Title $title ) {
 132                 $this->mTitle = $title;
 133         }
 134
 135         /**
 136          * Create a WikiPage object of the appropriate class for the given title.
 137          *
 138          * @param $title Title
 139          * @return WikiPage object of the appropriate type
 140          */
 141         public static function factory( Title $title ) {
 142                 $ns = $title->getNamespace();
 143
 144                 if ( $ns == NS_MEDIA ) {
 145                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 146                 } elseif ( $ns < 0 ) {
 147                         throw new MWException( "Invalid or virtual namespace $ns given." );
 148                 }
 149
 150                 switch ( $ns ) {
 151                         case NS_FILE:
 152                                 $page = new WikiFilePage( $title );
 153                                 break;
 154                         case NS_CATEGORY:
 155                                 $page = new WikiCategoryPage( $title );
 156                                 break;
 157                         default:
 158                                 $page = new WikiPage( $title );
 159                 }
 160
 161                 return $page;
 162         }
 163
 164         /**
 165          * Constructor from a page id
 166          *
 167          * @param $id Int article ID to load
 168          * @param $from string|int one of the following values:
 169          *        - "fromdb" or self::DATA_FROM_SLAVE to select from a slave database
 170          *        - "fromdbmaster" or self::DATA_FROM_MASTER to select from the master database
 171          *
 172          * @return WikiPage|null
 173          */
 174         public static function newFromID( $id, $from = 'fromdb' ) {
 175                 $from = self::convertSelectType( $from );
 176                 $db = wfGetDB( $from === self::DATA_FROM_MASTER ? DB_MASTER : DB_SLAVE );
 177                 $row = $db->selectRow( 'page', self::selectFields(), array( 'page_id' => $id ), __METHOD__ );
 178                 if ( !$row ) {
 179                         return null;
 180                 }
 181                 return self::newFromRow( $row, $from );
 182         }
 183
 184         /**
 185          * Constructor from a database row
 186          *
 187          * @since 1.20
 188          * @param $row object: database row containing at least fields returned
 189          *        by selectFields().
 190          * @param $from string|int: source of $data:
 191          *        - "fromdb" or self::DATA_FROM_SLAVE: from a slave DB
 192          *        - "fromdbmaster" or self::DATA_FROM_MASTER: from the master DB
 193          *        - "forupdate" or self::DATA_FOR_UPDATE: from the master DB using SELECT FOR UPDATE
 194          * @return WikiPage
 195          */
 196         public static function newFromRow( $row, $from = 'fromdb' ) {
 197                 $page = self::factory( Title::newFromRow( $row ) );
 198                 $page->loadFromRow( $row, $from );
 199                 return $page;
 200         }
 201
 202         /**
 203          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to DATA_* constants.
 204          *
 205          * @param $type object|string|int
 206          * @return mixed
 207          */
 208         private static function convertSelectType( $type ) {
 209                 switch ( $type ) {
 210                 case 'fromdb':
 211                         return self::DATA_FROM_SLAVE;
 212                 case 'fromdbmaster':
 213                         return self::DATA_FROM_MASTER;
 214                 case 'forupdate':
 215                         return self::DATA_FOR_UPDATE;
 216                 default:
 217                         // It may already be an integer or whatever else
 218                         return $type;
 219                 }
 220         }
 221
 222         /**
 223          * Returns overrides for action handlers.
 224          * Classes listed here will be used instead of the default one when
 225          * (and only when) $wgActions[$action] === true. This allows subclasses
 226          * to override the default behavior.
 227          *
 228          * @todo: move this UI stuff somewhere else
 229          *
 230          * @return Array
 231          */
 232         public function getActionOverrides() {
 233                 $content_handler = $this->getContentHandler();
 234                 return $content_handler->getActionOverrides();
 235         }
 236
 237         /**
 238          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 239          *
 240          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 241          *
 242          * @return ContentHandler
 243          *
 244          * @since 1.WD
 245          */
 246         public function getContentHandler() {
 247                 return ContentHandler::getForModelID( $this->getContentModel() );
 248         }
 249
 250         /**
 251          * Get the title object of the article
 252          * @return Title object of this page
 253          */
 254         public function getTitle() {
 255                 return $this->mTitle;
 256         }
 257
 258         /**
 259          * Clear the object
 260          */
 261         public function clear() {
 262                 $this->mDataLoaded = false;
 263                 $this->mDataLoadedFrom = self::DATA_NOT_LOADED;
 264
 265                 $this->mCounter = null;
 266                 $this->mRedirectTarget = null; # Title object if set
 267                 $this->mLastRevision = null; # Latest revision
 268                 $this->mTouched = '19700101000000';
 269                 $this->mTimestamp = '';
 270                 $this->mIsRedirect = false;
 271                 $this->mLatest = false;
 272                 $this->mPreparedEdit = false;
 273         }
 274
 275         /**
 276          * Return the list of revision fields that should be selected to create
 277          * a new page.
 278          *
 279          * @return array
 280          */
 281         public static function selectFields() {
 282                 global $wgContentHandlerUseDB;
 283
 284                 $fields = array(
 285                         'page_id',
 286                         'page_namespace',
 287                         'page_title',
 288                         'page_restrictions',
 289                         'page_counter',
 290                         'page_is_redirect',
 291                         'page_is_new',
 292                         'page_random',
 293                         'page_touched',
 294                         'page_latest',
 295                         'page_len',
 296                 );
 297
 298                 if ( $wgContentHandlerUseDB ) {
 299                         $fields[] = 'page_content_model';
 300                 }
 301
 302                 return $fields;
 303         }
 304
 305         /**
 306          * Fetch a page record with the given conditions
 307          * @param $dbr DatabaseBase object
 308          * @param $conditions Array
 309          * @param $options Array
 310          * @return mixed Database result resource, or false on failure
 311          */
 312         protected function pageData( $dbr, $conditions, $options = array() ) {
 313                 $fields = self::selectFields();
 314
 315                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 316
 317                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 318
 319                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 320
 321                 return $row;
 322         }
 323
 324         /**
 325          * Fetch a page record matching the Title object's namespace and title
 326          * using a sanitized title string
 327          *
 328          * @param $dbr DatabaseBase object
 329          * @param $title Title object
 330          * @param $options Array
 331          * @return mixed Database result resource, or false on failure
 332          */
 333         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 334                 return $this->pageData( $dbr, array(
 335                         'page_namespace' => $title->getNamespace(),
 336                         'page_title'     => $title->getDBkey() ), $options );
 337         }
 338
 339         /**
 340          * Fetch a page record matching the requested ID
 341          *
 342          * @param $dbr DatabaseBase
 343          * @param $id Integer
 344          * @param $options Array
 345          * @return mixed Database result resource, or false on failure
 346          */
 347         public function pageDataFromId( $dbr, $id, $options = array() ) {
 348                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 349         }
 350
 351         /**
 352          * Set the general counter, title etc data loaded from
 353          * some source.
 354          *
 355          * @param $from object|string|int One of the following:
 356          *        - A DB query result object
 357          *        - "fromdb" or self::DATA_FROM_SLAVE to get from a slave DB
 358          *        - "fromdbmaster" or self::DATA_FROM_MASTER to get from the master DB
 359          *        - "forupdate"  or self::DATA_FOR_UPDATE to get from the master DB using SELECT FOR UPDATE
 360          *
 361          * @return void
 362          */
 363         public function loadPageData( $from = 'fromdb' ) {
 364                 $from = self::convertSelectType( $from );
 365                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 366                         // We already have the data from the correct location, no need to load it twice.
 367                         return;
 368                 }
 369
 370                 if ( $from === self::DATA_FOR_UPDATE ) {
 371                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 372                 } elseif ( $from === self::DATA_FROM_MASTER ) {
 373                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 374                 } elseif ( $from === self::DATA_FROM_SLAVE ) {
 375                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 376                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 377                         # Note that DB also stores the master position in the session and checks it.
 378                         $touched = $this->getCachedLastEditTime();
 379                         if ( $touched ) { // key set
 380                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 381                                         $from = self::DATA_FROM_MASTER;
 382                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 383                                 }
 384                         }
 385                 } else {
 386                         // No idea from where the caller got this data, assume slave database.
 387                         $data = $from;
 388                         $from = self::DATA_FROM_SLAVE;
 389                 }
 390
 391                 $this->loadFromRow( $data, $from );
 392         }
 393
 394         /**
 395          * Load the object from a database row
 396          *
 397          * @since 1.20
 398          * @param $data object: database row containing at least fields returned
 399          *        by selectFields()
 400          * @param $from string|int One of the following:
 401          *        - "fromdb" or self::DATA_FROM_SLAVE if the data comes from a slave DB
 402          *        - "fromdbmaster" or self::DATA_FROM_MASTER if the data comes from the master DB
 403          *        - "forupdate"  or self::DATA_FOR_UPDATE if the data comes from from
 404          *          the master DB using SELECT FOR UPDATE
 405          */
 406         public function loadFromRow( $data, $from ) {
 407                 $lc = LinkCache::singleton();
 408
 409                 if ( $data ) {
 410                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 411
 412                         $this->mTitle->loadFromRow( $data );
 413
 414                         # Old-fashioned restrictions
 415                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 416
 417                         $this->mCounter     = intval( $data->page_counter );
 418                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 419                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 420                         $this->mLatest      = intval( $data->page_latest );
 421                 } else {
 422                         $lc->addBadLinkObj( $this->mTitle );
 423
 424                         $this->mTitle->loadFromRow( false );
 425                 }
 426
 427                 $this->mDataLoaded = true;
 428                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 429         }
 430
 431         /**
 432          * @return int Page ID
 433          */
 434         public function getId() {
 435                 return $this->mTitle->getArticleID();
 436         }
 437
 438         /**
 439          * @return bool Whether or not the page exists in the database
 440          */
 441         public function exists() {
 442                 return $this->mTitle->exists();
 443         }
 444
 445         /**
 446          * Check if this page is something we're going to be showing
 447          * some sort of sensible content for. If we return false, page
 448          * views (plain action=view) will return an HTTP 404 response,
 449          * so spiders and robots can know they're following a bad link.
 450          *
 451          * @return bool
 452          */
 453         public function hasViewableContent() {
 454                 return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
 455         }
 456
 457         /**
 458          * @return int The view count for the page
 459          */
 460         public function getCount() {
 461                 if ( !$this->mDataLoaded ) {
 462                         $this->loadPageData();
 463                 }
 464
 465                 return $this->mCounter;
 466         }
 467
 468         /**
 469          * Tests if the article text represents a redirect
 470          *
 471          * @param $text mixed string containing article contents, or boolean
 472          * @return bool
 473          */
 474         public function isRedirect( $text = false ) {
 475                 if ( $text === false ) $content = $this->getContent();
 476                 else $content = ContentHandler::makeContent( $text, $this->mTitle ); # TODO: allow model and format to be provided; or better, expect a Content object
 477
 478
 479                 if ( empty( $content ) ) return false;
 480                 else return $content->isRedirect();
 481         }
 482
 483         /**
 484          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 485          *
 486          * Will use the revisions actual content model if the page exists,
 487          * and the page's default if the page doesn't exist yet.
 488          *
 489          * @return int
 490          *
 491          * @since 1.WD
 492          */
 493         public function getContentModel() {
 494                 if ( $this->exists() ) {
 495                         # look at the revision's actual content model
 496                         $rev = $this->getRevision();
 497
 498                         if ( $rev !== null ) {
 499                                 return $rev->getContentModel();
 500                         } else {
 501                                 wfWarn( "Page exists but has no revision!" );
 502                         }
 503                 }
 504
 505                 # use the default model for this page
 506                 return $this->mTitle->getContentModel();
 507         }
 508
 509         /**
 510          * Loads page_touched and returns a value indicating if it should be used
 511          * @return boolean true if not a redirect
 512          */
 513         public function checkTouched() {
 514                 if ( !$this->mDataLoaded ) {
 515                         $this->loadPageData();
 516                 }
 517                 return !$this->mIsRedirect;
 518         }
 519
 520         /**
 521          * Get the page_touched field
 522          * @return string containing GMT timestamp
 523          */
 524         public function getTouched() {
 525                 if ( !$this->mDataLoaded ) {
 526                         $this->loadPageData();
 527                 }
 528                 return $this->mTouched;
 529         }
 530
 531         /**
 532          * Get the page_latest field
 533          * @return integer rev_id of current revision
 534          */
 535         public function getLatest() {
 536                 if ( !$this->mDataLoaded ) {
 537                         $this->loadPageData();
 538                 }
 539                 return (int)$this->mLatest;
 540         }
 541
 542         /**
 543          * Get the Revision object of the oldest revision
 544          * @return Revision|null
 545          */
 546         public function getOldestRevision() {
 547                 wfProfileIn( __METHOD__ );
 548
 549                 // Try using the slave database first, then try the master
 550                 $continue = 2;
 551                 $db = wfGetDB( DB_SLAVE );
 552                 $revSelectFields = Revision::selectFields();
 553
 554                 while ( $continue ) {
 555                         $row = $db->selectRow(
 556                                 array( 'page', 'revision' ),
 557                                 $revSelectFields,
 558                                 array(
 559                                         'page_namespace' => $this->mTitle->getNamespace(),
 560                                         'page_title' => $this->mTitle->getDBkey(),
 561                                         'rev_page = page_id'
 562                                 ),
 563                                 __METHOD__,
 564                                 array(
 565                                         'ORDER BY' => 'rev_timestamp ASC'
 566                                 )
 567                         );
 568
 569                         if ( $row ) {
 570                                 $continue = 0;
 571                         } else {
 572                                 $db = wfGetDB( DB_MASTER );
 573                                 $continue--;
 574                         }
 575                 }
 576
 577                 wfProfileOut( __METHOD__ );
 578                 if ( $row ) {
 579                         return Revision::newFromRow( $row );
 580                 } else {
 581                         return null;
 582                 }
 583         }
 584
 585         /**
 586          * Loads everything except the text
 587          * This isn't necessary for all uses, so it's only done if needed.
 588          */
 589         protected function loadLastEdit() {
 590                 if ( $this->mLastRevision !== null ) {
 591                         return; // already loaded
 592                 }
 593
 594                 $latest = $this->getLatest();
 595                 if ( !$latest ) {
 596                         return; // page doesn't exist or is missing page_latest info
 597                 }
 598
 599                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 600                 if ( $revision ) { // sanity
 601                         $this->setLastEdit( $revision );
 602                 }
 603         }
 604
 605         /**
 606          * Set the latest revision
 607          */
 608         protected function setLastEdit( Revision $revision ) {
 609                 $this->mLastRevision = $revision;
 610                 $this->mTimestamp = $revision->getTimestamp();
 611         }
 612
 613         /**
 614          * Get the latest revision
 615          * @return Revision|null
 616          */
 617         public function getRevision() {
 618                 $this->loadLastEdit();
 619                 if ( $this->mLastRevision ) {
 620                         return $this->mLastRevision;
 621                 }
 622                 return null;
 623         }
 624
 625         /**
 626          * Get the content of the current revision. No side-effects...
 627          *
 628          * @param $audience Integer: one of:
 629          *      Revision::FOR_PUBLIC       to be displayed to all users
 630          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 631          *      Revision::RAW              get the text regardless of permissions
 632          * @return Content|null The content of the current revision
 633          *
 634          * @since 1.WD
 635          */
 636         public function getContent( $audience = Revision::FOR_PUBLIC ) {
 637                 $this->loadLastEdit();
 638                 if ( $this->mLastRevision ) {
 639                         return $this->mLastRevision->getContent( $audience );
 640                 }
 641                 return null;
 642         }
 643
 644         /**
 645          * Get the text of the current revision. No side-effects...
 646          *
 647          * @param $audience Integer: one of:
 648          *      Revision::FOR_PUBLIC       to be displayed to all users
 649          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 650          *      Revision::RAW              get the text regardless of permissions
 651          * @return String|false The text of the current revision
 652          * @deprecated as of 1.WD, getContent() should be used instead.
 653          */
 654         public function getText( $audience = Revision::FOR_PUBLIC ) { #@todo: deprecated, replace usage!
 655                 wfDeprecated( __METHOD__, '1.WD' );
 656
 657                 $this->loadLastEdit();
 658                 if ( $this->mLastRevision ) {
 659                         return $this->mLastRevision->getText( $audience );
 660                 }
 661                 return false;
 662         }
 663
 664         /**
 665          * Get the text of the current revision. No side-effects...
 666          *
 667          * @return String|bool The text of the current revision. False on failure
 668          * @deprecated as of 1.WD, getContent() should be used instead.
 669          */
 670         public function getRawText() { #@todo: deprecated, replace usage!
 671                 wfDeprecated( __METHOD__, '1.WD' );
 672
 673                 return $this->getText( Revision::RAW );
 674         }
 675
 676         /**
 677          * @return string MW timestamp of last article revision
 678          */
 679         public function getTimestamp() {
 680                 // Check if the field has been filled by WikiPage::setTimestamp()
 681                 if ( !$this->mTimestamp ) {
 682                         $this->loadLastEdit();
 683                 }
 684
 685                 return wfTimestamp( TS_MW, $this->mTimestamp );
 686         }
 687
 688         /**
 689          * Set the page timestamp (use only to avoid DB queries)
 690          * @param $ts string MW timestamp of last article revision
 691          * @return void
 692          */
 693         public function setTimestamp( $ts ) {
 694                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 695         }
 696
 697         /**
 698          * @param $audience Integer: one of:
 699          *      Revision::FOR_PUBLIC       to be displayed to all users
 700          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 701          *      Revision::RAW              get the text regardless of permissions
 702          * @return int user ID for the user that made the last article revision
 703          */
 704         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 705                 $this->loadLastEdit();
 706                 if ( $this->mLastRevision ) {
 707                         return $this->mLastRevision->getUser( $audience );
 708                 } else {
 709                         return -1;
 710                 }
 711         }
 712
 713         /**
 714          * Get the User object of the user who created the page
 715          * @param $audience Integer: one of:
 716          *      Revision::FOR_PUBLIC       to be displayed to all users
 717          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 718          *      Revision::RAW              get the text regardless of permissions
 719          * @return User|null
 720          */
 721         public function getCreator( $audience = Revision::FOR_PUBLIC ) {
 722                 $revision = $this->getOldestRevision();
 723                 if ( $revision ) {
 724                         $userName = $revision->getUserText( $audience );
 725                         return User::newFromName( $userName, false );
 726                 } else {
 727                         return null;
 728                 }
 729         }
 730
 731         /**
 732          * @param $audience Integer: one of:
 733          *      Revision::FOR_PUBLIC       to be displayed to all users
 734          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 735          *      Revision::RAW              get the text regardless of permissions
 736          * @return string username of the user that made the last article revision
 737          */
 738         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 739                 $this->loadLastEdit();
 740                 if ( $this->mLastRevision ) {
 741                         return $this->mLastRevision->getUserText( $audience );
 742                 } else {
 743                         return '';
 744                 }
 745         }
 746
 747         /**
 748          * @param $audience Integer: one of:
 749          *      Revision::FOR_PUBLIC       to be displayed to all users
 750          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 751          *      Revision::RAW              get the text regardless of permissions
 752          * @return string Comment stored for the last article revision
 753          */
 754         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 755                 $this->loadLastEdit();
 756                 if ( $this->mLastRevision ) {
 757                         return $this->mLastRevision->getComment( $audience );
 758                 } else {
 759                         return '';
 760                 }
 761         }
 762
 763         /**
 764          * Returns true if last revision was marked as "minor edit"
 765          *
 766          * @return boolean Minor edit indicator for the last article revision.
 767          */
 768         public function getMinorEdit() {
 769                 $this->loadLastEdit();
 770                 if ( $this->mLastRevision ) {
 771                         return $this->mLastRevision->isMinor();
 772                 } else {
 773                         return false;
 774                 }
 775         }
 776
 777         /**
 778          * Get the cached timestamp for the last time the page changed.
 779          * This is only used to help handle slave lag by comparing to page_touched.
 780          * @return string MW timestamp
 781          */
 782         protected function getCachedLastEditTime() {
 783                 global $wgMemc;
 784                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 785                 return $wgMemc->get( $key );
 786         }
 787
 788         /**
 789          * Set the cached timestamp for the last time the page changed.
 790          * This is only used to help handle slave lag by comparing to page_touched.
 791          * @param $timestamp string
 792          * @return void
 793          */
 794         public function setCachedLastEditTime( $timestamp ) {
 795                 global $wgMemc;
 796                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 797                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 798         }
 799
 800         /**
 801          * Determine whether a page would be suitable for being counted as an
 802          * article in the site_stats table based on the title & its content
 803          *
 804          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 805          *        if false, the current database state will be used
 806          * @return Boolean
 807          */
 808         public function isCountable( $editInfo = false ) {
 809                 global $wgArticleCountMethod;
 810
 811                 if ( !$this->mTitle->isContentPage() ) {
 812                         return false;
 813                 }
 814
 815                 if ( $editInfo ) {
 816                         $content = $editInfo->pstContent;
 817                 } else {
 818                         $content = $this->getContent();
 819                 }
 820
 821                 if ( !$content || $content->isRedirect( ) ) {
 822                         return false;
 823                 }
 824
 825                 $hasLinks = null;
 826
 827                 if ( $wgArticleCountMethod === 'link' ) {
 828                         # nasty special case to avoid re-parsing to detect links
 829
 830                         if ( $editInfo ) {
 831                                 // ParserOutput::getLinks() is a 2D array of page links, so
 832                                 // to be really correct we would need to recurse in the array
 833                                 // but the main array should only have items in it if there are
 834                                 // links.
 835                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 836                         } else {
 837                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 838                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 839                         }
 840                 }
 841
 842                 return $content->isCountable( $hasLinks );
 843         }
 844
 845         /**
 846          * If this page is a redirect, get its target
 847          *
 848          * The target will be fetched from the redirect table if possible.
 849          * If this page doesn't have an entry there, call insertRedirect()
 850          * @return Title|mixed object, or null if this page is not a redirect
 851          */
 852         public function getRedirectTarget() {
 853                 if ( !$this->mTitle->isRedirect() ) {
 854                         return null;
 855                 }
 856
 857                 if ( $this->mRedirectTarget !== null ) {
 858                         return $this->mRedirectTarget;
 859                 }
 860
 861                 # Query the redirect table
 862                 $dbr = wfGetDB( DB_SLAVE );
 863                 $row = $dbr->selectRow( 'redirect',
 864                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 865                         array( 'rd_from' => $this->getId() ),
 866                         __METHOD__
 867                 );
 868
 869                 // rd_fragment and rd_interwiki were added later, populate them if empty
 870                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 871                         return $this->mRedirectTarget = Title::makeTitle(
 872                                 $row->rd_namespace, $row->rd_title,
 873                                 $row->rd_fragment, $row->rd_interwiki );
 874                 }
 875
 876                 # This page doesn't have an entry in the redirect table
 877                 return $this->mRedirectTarget = $this->insertRedirect();
 878         }
 879
 880         /**
 881          * Insert an entry for this page into the redirect table.
 882          *
 883          * Don't call this function directly unless you know what you're doing.
 884          * @return Title object or null if not a redirect
 885          */
 886         public function insertRedirect() {
 887                 // recurse through to only get the final target
 888                 $content = $this->getContent();
 889                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 890                 if ( !$retval ) {
 891                         return null;
 892                 }
 893                 $this->insertRedirectEntry( $retval );
 894                 return $retval;
 895         }
 896
 897         /**
 898          * Insert or update the redirect table entry for this page to indicate
 899          * it redirects to $rt .
 900          * @param $rt Title redirect target
 901          */
 902         public function insertRedirectEntry( $rt ) {
 903                 $dbw = wfGetDB( DB_MASTER );
 904                 $dbw->replace( 'redirect', array( 'rd_from' ),
 905                         array(
 906                                 'rd_from'      => $this->getId(),
 907                                 'rd_namespace' => $rt->getNamespace(),
 908                                 'rd_title'     => $rt->getDBkey(),
 909                                 'rd_fragment'  => $rt->getFragment(),
 910                                 'rd_interwiki' => $rt->getInterwiki(),
 911                         ),
 912                         __METHOD__
 913                 );
 914         }
 915
 916         /**
 917          * Get the Title object or URL this page redirects to
 918          *
 919          * @return mixed false, Title of in-wiki target, or string with URL
 920          */
 921         public function followRedirect() {
 922                 return $this->getRedirectURL( $this->getRedirectTarget() );
 923         }
 924
 925         /**
 926          * Get the Title object or URL to use for a redirect. We use Title
 927          * objects for same-wiki, non-special redirects and URLs for everything
 928          * else.
 929          * @param $rt Title Redirect target
 930          * @return mixed false, Title object of local target, or string with URL
 931          */
 932         public function getRedirectURL( $rt ) {
 933                 if ( !$rt ) {
 934                         return false;
 935                 }
 936
 937                 if ( $rt->isExternal() ) {
 938                         if ( $rt->isLocal() ) {
 939                                 // Offsite wikis need an HTTP redirect.
 940                                 //
 941                                 // This can be hard to reverse and may produce loops,
 942                                 // so they may be disabled in the site configuration.
 943                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 944                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 945                         } else {
 946                                 // External pages pages without "local" bit set are not valid
 947                                 // redirect targets
 948                                 return false;
 949                         }
 950                 }
 951
 952                 if ( $rt->isSpecialPage() ) {
 953                         // Gotta handle redirects to special pages differently:
 954                         // Fill the HTTP response "Location" header and ignore
 955                         // the rest of the page we're on.
 956                         //
 957                         // Some pages are not valid targets
 958                         if ( $rt->isValidRedirectTarget() ) {
 959                                 return $rt->getFullURL();
 960                         } else {
 961                                 return false;
 962                         }
 963                 }
 964
 965                 return $rt;
 966         }
 967
 968         /**
 969          * Get a list of users who have edited this article, not including the user who made
 970          * the most recent revision, which you can get from $article->getUser() if you want it
 971          * @return UserArrayFromResult
 972          */
 973         public function getContributors() {
 974                 # @todo FIXME: This is expensive; cache this info somewhere.
 975
 976                 $dbr = wfGetDB( DB_SLAVE );
 977
 978                 if ( $dbr->implicitGroupby() ) {
 979                         $realNameField = 'user_real_name';
 980                 } else {
 981                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 982                 }
 983
 984                 $tables = array( 'revision', 'user' );
 985
 986                 $fields = array(
 987                         'rev_user as user_id',
 988                         'rev_user_text AS user_name',
 989                         $realNameField,
 990                         'MAX(rev_timestamp) AS timestamp',
 991                 );
 992
 993                 $conds = array( 'rev_page' => $this->getId() );
 994
 995                 // The user who made the top revision gets credited as "this page was last edited by
 996                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 997                 $user = $this->getUser();
 998                 if ( $user ) {
 999                         $conds[] = "rev_user != $user";
1000                 } else {
1001                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1002                 }
1003
1004                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
1005
1006                 $jconds = array(
1007                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
1008                 );
1009
1010                 $options = array(
1011                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
1012                         'ORDER BY' => 'timestamp DESC',
1013                 );
1014
1015                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1016                 return new UserArrayFromResult( $res );
1017         }
1018
1019         /**
1020          * Get the last N authors
1021          * @param $num Integer: number of revisions to get
1022          * @param $revLatest String: the latest rev_id, selected from the master (optional)
1023          * @return array Array of authors, duplicates not removed
1024          */
1025         public function getLastNAuthors( $num, $revLatest = 0 ) {
1026                 wfProfileIn( __METHOD__ );
1027                 // First try the slave
1028                 // If that doesn't have the latest revision, try the master
1029                 $continue = 2;
1030                 $db = wfGetDB( DB_SLAVE );
1031
1032                 do {
1033                         $res = $db->select( array( 'page', 'revision' ),
1034                                 array( 'rev_id', 'rev_user_text' ),
1035                                 array(
1036                                         'page_namespace' => $this->mTitle->getNamespace(),
1037                                         'page_title' => $this->mTitle->getDBkey(),
1038                                         'rev_page = page_id'
1039                                 ), __METHOD__,
1040                                 array(
1041                                         'ORDER BY' => 'rev_timestamp DESC',
1042                                         'LIMIT' => $num
1043                                 )
1044                         );
1045
1046                         if ( !$res ) {
1047                                 wfProfileOut( __METHOD__ );
1048                                 return array();
1049                         }
1050
1051                         $row = $db->fetchObject( $res );
1052
1053                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1054                                 $db = wfGetDB( DB_MASTER );
1055                                 $continue--;
1056                         } else {
1057                                 $continue = 0;
1058                         }
1059                 } while ( $continue );
1060
1061                 $authors = array( $row->rev_user_text );
1062
1063                 foreach ( $res as $row ) {
1064                         $authors[] = $row->rev_user_text;
1065                 }
1066
1067                 wfProfileOut( __METHOD__ );
1068                 return $authors;
1069         }
1070
1071         /**
1072          * Should the parser cache be used?
1073          *
1074          * @param $parserOptions ParserOptions to check
1075          * @param $oldid int
1076          * @return boolean
1077          */
1078         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1079                 global $wgEnableParserCache;
1080
1081                 return $wgEnableParserCache
1082                         && $parserOptions->getStubThreshold() == 0
1083                         && $this->mTitle->exists()
1084                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1085                         && $this->getContentHandler()->isParserCacheSupported();
1086         }
1087
1088         /**
1089          * Get a ParserOutput for the given ParserOptions and revision ID.
1090          * The parser cache will be used if possible.
1091          *
1092          * @since 1.19
1093          * @param $parserOptions ParserOptions to use for the parse operation
1094          * @param $oldid Revision ID to get the text from, passing null or 0 will
1095          *               get the current revision (default value)
1096          * @param $context IContextSource context for parsing
1097          *
1098          * @return ParserOutput or false if the revision was not found
1099          */
1100         public function getParserOutput( ParserOptions $parserOptions, $oldid = null, IContextSource $context = null ) {
1101                 wfProfileIn( __METHOD__ );
1102
1103                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1104                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1105                 if ( $parserOptions->getStubThreshold() ) {
1106                         wfIncrStats( 'pcache_miss_stub' );
1107                 }
1108
1109                 if ( $useParserCache ) {
1110                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1111                         if ( $parserOutput !== false ) {
1112                                 wfProfileOut( __METHOD__ );
1113                                 return $parserOutput;
1114                         }
1115                 }
1116
1117                 if ( $oldid === null || $oldid === 0 ) {
1118                         $oldid = $this->getLatest();
1119                 }
1120
1121                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache, null, $context );
1122                 $pool->execute();
1123
1124                 wfProfileOut( __METHOD__ );
1125
1126                 return $pool->getParserOutput();
1127         }
1128
1129         /**
1130          * Do standard deferred updates after page view
1131          * @param $user User The relevant user
1132          */
1133         public function doViewUpdates( User $user ) {
1134                 global $wgDisableCounters;
1135                 if ( wfReadOnly() ) {
1136                         return;
1137                 }
1138
1139                 # Don't update page view counters on views from bot users (bug 14044)
1140                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
1141                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1142                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1143                 }
1144
1145                 # Update newtalk / watchlist notification status
1146                 $user->clearNotification( $this->mTitle );
1147         }
1148
1149         /**
1150          * Perform the actions of a page purging
1151          * @return bool
1152          */
1153         public function doPurge() {
1154                 global $wgUseSquid;
1155
1156                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
1157                         return false;
1158                 }
1159
1160                 // Invalidate the cache
1161                 $this->mTitle->invalidateCache();
1162                 $this->clear();
1163
1164                 if ( $wgUseSquid ) {
1165                         // Commit the transaction before the purge is sent
1166                         $dbw = wfGetDB( DB_MASTER );
1167                         $dbw->commit( __METHOD__ );
1168
1169                         // Send purge
1170                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1171                         $update->doUpdate();
1172                 }
1173
1174                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1175                         if ( $this->mTitle->exists() ) {
1176                                 $text = ContentHandler::getContentText( $this->getContent() );
1177                         } else {
1178                                 $text = false;
1179                         }
1180
1181                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1182                 }
1183                 return true;
1184         }
1185
1186         /**
1187          * Insert a new empty page record for this article.
1188          * This *must* be followed up by creating a revision
1189          * and running $this->updateRevisionOn( ... );
1190          * or else the record will be left in a funky state.
1191          * Best if all done inside a transaction.
1192          *
1193          * @param $dbw DatabaseBase
1194          * @return int The newly created page_id key, or false if the title already existed
1195          */
1196         public function insertOn( $dbw ) {
1197                 wfProfileIn( __METHOD__ );
1198
1199                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1200                 $dbw->insert( 'page', array(
1201                         'page_id'           => $page_id,
1202                         'page_namespace'    => $this->mTitle->getNamespace(),
1203                         'page_title'        => $this->mTitle->getDBkey(),
1204                         'page_counter'      => 0,
1205                         'page_restrictions' => '',
1206                         'page_is_redirect'  => 0, # Will set this shortly...
1207                         'page_is_new'       => 1,
1208                         'page_random'       => wfRandom(),
1209                         'page_touched'      => $dbw->timestamp(),
1210                         'page_latest'       => 0, # Fill this in shortly...
1211                         'page_len'          => 0, # Fill this in shortly...
1212                 ), __METHOD__, 'IGNORE' );
1213
1214                 $affected = $dbw->affectedRows();
1215
1216                 if ( $affected ) {
1217                         $newid = $dbw->insertId();
1218                         $this->mTitle->resetArticleID( $newid );
1219                 }
1220                 wfProfileOut( __METHOD__ );
1221
1222                 return $affected ? $newid : false;
1223         }
1224
1225         /**
1226          * Update the page record to point to a newly saved revision.
1227          *
1228          * @param $dbw DatabaseBase: object
1229          * @param $revision Revision: For ID number, and text used to set
1230          *                  length and redirect status fields
1231          * @param $lastRevision Integer: if given, will not overwrite the page field
1232          *                      when different from the currently set value.
1233          *                      Giving 0 indicates the new page flag should be set
1234          *                      on.
1235          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1236          *                           removing rows in redirect table.
1237          * @return bool true on success, false on failure
1238          * @private
1239          */
1240         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1241                 global $wgContentHandlerUseDB;
1242
1243                 wfProfileIn( __METHOD__ );
1244
1245                 $content = $revision->getContent();
1246                 $len = $content->getSize();
1247                 $rt = $content->getUltimateRedirectTarget();
1248
1249                 $conditions = array( 'page_id' => $this->getId() );
1250
1251                 if ( !is_null( $lastRevision ) ) {
1252                         # An extra check against threads stepping on each other
1253                         $conditions['page_latest'] = $lastRevision;
1254                 }
1255
1256                 $now = wfTimestampNow();
1257                 $row = array( /* SET */
1258                         'page_latest'      => $revision->getId(),
1259                         'page_touched'     => $dbw->timestamp( $now ),
1260                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1261                         'page_is_redirect' => $rt !== null ? 1 : 0,
1262                         'page_len'         => $len,
1263                 );
1264
1265                 if ( $wgContentHandlerUseDB ) {
1266                         $row[ 'page_content_model' ] = $revision->getContentModel();
1267                 }
1268
1269                 $dbw->update( 'page',
1270                         $row,
1271                         $conditions,
1272                         __METHOD__ );
1273
1274                 $result = $dbw->affectedRows() != 0;
1275                 if ( $result ) {
1276                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1277                         $this->setLastEdit( $revision );
1278                         $this->setCachedLastEditTime( $now );
1279                         $this->mLatest = $revision->getId();
1280                         $this->mIsRedirect = (bool)$rt;
1281                         # Update the LinkCache.
1282                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest );
1283                 }
1284
1285                 wfProfileOut( __METHOD__ );
1286                 return $result;
1287         }
1288
1289         /**
1290          * Add row to the redirect table if this is a redirect, remove otherwise.
1291          *
1292          * @param $dbw DatabaseBase
1293          * @param $redirectTitle Title object pointing to the redirect target,
1294          *                       or NULL if this is not a redirect
1295          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1296          *                           removing rows in redirect table.
1297          * @return bool true on success, false on failure
1298          * @private
1299          */
1300         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1301                 // Always update redirects (target link might have changed)
1302                 // Update/Insert if we don't know if the last revision was a redirect or not
1303                 // Delete if changing from redirect to non-redirect
1304                 $isRedirect = !is_null( $redirectTitle );
1305
1306                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1307                         return true;
1308                 }
1309
1310                 wfProfileIn( __METHOD__ );
1311                 if ( $isRedirect ) {
1312                         $this->insertRedirectEntry( $redirectTitle );
1313                 } else {
1314                         // This is not a redirect, remove row from redirect table
1315                         $where = array( 'rd_from' => $this->getId() );
1316                         $dbw->delete( 'redirect', $where, __METHOD__ );
1317                 }
1318
1319                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1320                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1321                 }
1322                 wfProfileOut( __METHOD__ );
1323
1324                 return ( $dbw->affectedRows() != 0 );
1325         }
1326
1327         /**
1328          * If the given revision is newer than the currently set page_latest,
1329          * update the page record. Otherwise, do nothing.
1330          *
1331          * @param $dbw DatabaseBase object
1332          * @param $revision Revision object
1333          * @return mixed
1334          */
1335         public function updateIfNewerOn( $dbw, $revision ) {
1336                 wfProfileIn( __METHOD__ );
1337
1338                 $row = $dbw->selectRow(
1339                         array( 'revision', 'page' ),
1340                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1341                         array(
1342                                 'page_id' => $this->getId(),
1343                                 'page_latest=rev_id' ),
1344                         __METHOD__ );
1345
1346                 if ( $row ) {
1347                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1348                                 wfProfileOut( __METHOD__ );
1349                                 return false;
1350                         }
1351                         $prev = $row->rev_id;
1352                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1353                 } else {
1354                         # No or missing previous revision; mark the page as new
1355                         $prev = 0;
1356                         $lastRevIsRedirect = null;
1357                 }
1358
1359                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1360
1361                 wfProfileOut( __METHOD__ );
1362                 return $ret;
1363         }
1364
1365         /**
1366          * Get the text that needs to be saved in order to undo all revisions
1367          * between $undo and $undoafter. Revisions must belong to the same page,
1368          * must exist and must not be deleted
1369          * @param $undo Revision
1370          * @param $undoafter Revision Must be an earlier revision than $undo
1371          * @return mixed string on success, false on failure
1372          * @deprecated since 1.WD: use ContentHandler::getUndoContent() instead.
1373          */
1374         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1375                 wfDeprecated( __METHOD__, '1.WD' );
1376
1377                 $this->loadLastEdit();
1378
1379                 if ( $this->mLastRevision ) {
1380                         if ( is_null( $undoafter ) ) {
1381                                 $undoafter = $undo->getPrevious();
1382                         }
1383
1384                         $handler = $this->getContentHandler();
1385                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1386
1387                         if ( !$undone ) {
1388                                 return false;
1389                         } else {
1390                                 return ContentHandler::getContentText( $undone );
1391                         }
1392                 }
1393
1394                 return false;
1395         }
1396
1397         /**
1398          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1399          * @param $text String: new text of the section
1400          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1401          * @param $edittime String: revision timestamp or null to use the current revision
1402          * @return String new complete article text, or null if error
1403          *
1404          * @deprecated since 1.WD, use replaceSectionContent() instead
1405          */
1406         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1407                 wfDeprecated( __METHOD__, '1.WD' );
1408
1409                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() ); #XXX: could make section title, but that's not required.
1410
1411                 $newContent = $this->replaceSectionContent( $section, $sectionContent, $sectionTitle, $edittime );
1412
1413                 return ContentHandler::getContentText( $newContent ); #XXX: unclear what will happen for non-wikitext!
1414         }
1415
1416         /**
1417          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1418          * @param $content Content: new content of the section
1419          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1420          * @param $edittime String: revision timestamp or null to use the current revision
1421          *
1422          * @return Content new complete article content, or null if error
1423          *
1424          * @since 1.WD
1425          */
1426         public function replaceSectionContent( $section, Content $sectionContent, $sectionTitle = '', $edittime = null ) {
1427                 wfProfileIn( __METHOD__ );
1428
1429                 if ( strval( $section ) == '' ) {
1430                         // Whole-page edit; let the whole text through
1431                         $newContent = $sectionContent;
1432                 } else {
1433                         // Bug 30711: always use current version when adding a new section
1434                         if ( is_null( $edittime ) || $section == 'new' ) {
1435                                 $oldContent = $this->getContent();
1436                                 if ( ! $oldContent ) {
1437                                         wfDebug( __METHOD__ . ": no page text\n" );
1438                                         wfProfileOut( __METHOD__ );
1439                                         return null;
1440                                 }
1441                         } else {
1442                                 $dbw = wfGetDB( DB_MASTER );
1443                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1444
1445                                 if ( !$rev ) {
1446                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1447                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1448                                         wfProfileOut( __METHOD__ );
1449                                         return null;
1450                                 }
1451
1452                                 $oldContent = $rev->getContent();
1453                         }
1454
1455                         $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1456                 }
1457
1458                 wfProfileOut( __METHOD__ );
1459                 return $newContent;
1460         }
1461
1462         /**
1463          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1464          * @param $flags Int
1465          * @return Int updated $flags
1466          */
1467         function checkFlags( $flags ) {
1468                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1469                         if ( $this->mTitle->getArticleID() ) {
1470                                 $flags |= EDIT_UPDATE;
1471                         } else {
1472                                 $flags |= EDIT_NEW;
1473                         }
1474                 }
1475
1476                 return $flags;
1477         }
1478
1479         /**
1480          * Change an existing article or create a new article. Updates RC and all necessary caches,
1481          * optionally via the deferred update array.
1482          *
1483          * @param $text String: new text
1484          * @param $summary String: edit summary
1485          * @param $flags Integer bitfield:
1486          *      EDIT_NEW
1487          *          Article is known or assumed to be non-existent, create a new one
1488          *      EDIT_UPDATE
1489          *          Article is known or assumed to be pre-existing, update it
1490          *      EDIT_MINOR
1491          *          Mark this edit minor, if the user is allowed to do so
1492          *      EDIT_SUPPRESS_RC
1493          *          Do not log the change in recentchanges
1494          *      EDIT_FORCE_BOT
1495          *          Mark the edit a "bot" edit regardless of user rights
1496          *      EDIT_DEFER_UPDATES
1497          *          Defer some of the updates until the end of index.php
1498          *      EDIT_AUTOSUMMARY
1499          *          Fill in blank summaries with generated text where possible
1500          *
1501          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1502          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1503          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1504          * edit-already-exists error will be returned. These two conditions are also possible with
1505          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1506          *
1507          * @param $baseRevId int the revision ID this edit was based off, if any
1508          * @param $user User the user doing the edit
1509          *
1510          * @return Status object. Possible errors:
1511          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1512          *     edit-gone-missing:       In update mode, but the article didn't exist
1513          *     edit-conflict:           In update mode, the article changed unexpectedly
1514          *     edit-no-change:          Warning that the text was the same as before
1515          *     edit-already-exists:     In creation mode, but the article already exists
1516          *
1517          *  Extensions may define additional errors.
1518          *
1519          *  $return->value will contain an associative array with members as follows:
1520          *     new:                     Boolean indicating if the function attempted to create a new article
1521          *     revision:                The revision object for the inserted revision, or null
1522          *
1523          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1524          *
1525          * @deprecated since 1.WD: use doEditContent() instead.
1526          */
1527         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) { #@todo: use doEditContent() instead
1528                 wfDeprecated( __METHOD__, '1.WD' );
1529
1530                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1531
1532                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1533         }
1534
1535         /**
1536          * Change an existing article or create a new article. Updates RC and all necessary caches,
1537          * optionally via the deferred update array.
1538          *
1539          * @param $content Content: new content
1540          * @param $summary String: edit summary
1541          * @param $flags Integer bitfield:
1542          *      EDIT_NEW
1543          *          Article is known or assumed to be non-existent, create a new one
1544          *      EDIT_UPDATE
1545          *          Article is known or assumed to be pre-existing, update it
1546          *      EDIT_MINOR
1547          *          Mark this edit minor, if the user is allowed to do so
1548          *      EDIT_SUPPRESS_RC
1549          *          Do not log the change in recentchanges
1550          *      EDIT_FORCE_BOT
1551          *          Mark the edit a "bot" edit regardless of user rights
1552          *      EDIT_DEFER_UPDATES
1553          *          Defer some of the updates until the end of index.php
1554          *      EDIT_AUTOSUMMARY
1555          *          Fill in blank summaries with generated text where possible
1556          *
1557          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1558          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1559          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1560          * edit-already-exists error will be returned. These two conditions are also possible with
1561          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1562          *
1563          * @param $baseRevId the revision ID this edit was based off, if any
1564          * @param $user User the user doing the edit
1565          * @param $serialisation_format String: format for storing the content in the database
1566          *
1567          * @return Status object. Possible errors:
1568          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1569          *     edit-gone-missing:       In update mode, but the article didn't exist
1570          *     edit-conflict:           In update mode, the article changed unexpectedly
1571          *     edit-no-change:          Warning that the text was the same as before
1572          *     edit-already-exists:     In creation mode, but the article already exists
1573          *
1574          *  Extensions may define additional errors.
1575          *
1576          *  $return->value will contain an associative array with members as follows:
1577          *     new:                     Boolean indicating if the function attempted to create a new article
1578          *     revision:                The revision object for the inserted revision, or null
1579          *
1580          * @since 1.WD
1581          */
1582         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1583                                                                    User $user = null, $serialisation_format = null ) {
1584                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1585
1586                 # Low-level sanity check
1587                 if ( $this->mTitle->getText() === '' ) {
1588                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1589                 }
1590
1591                 wfProfileIn( __METHOD__ );
1592
1593                 $user = is_null( $user ) ? $wgUser : $user;
1594                 $status = Status::newGood( array() );
1595
1596                 // Load the data from the master database if needed.
1597                 // The caller may already loaded it from the master or even loaded it using
1598                 // SELECT FOR UPDATE, so do not override that using clear().
1599                 $this->loadPageData( 'fromdbmaster' );
1600
1601                 $flags = $this->checkFlags( $flags );
1602
1603                 # call legacy hook
1604                 $hook_ok = wfRunHooks( 'ArticleContentSave', array( &$this, &$user, &$content, &$summary,
1605                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) );
1606
1607                 if ( $hook_ok && !empty( $wgHooks['ArticleSave'] ) ) { # avoid serialization overhead if the hook isn't present
1608                         $content_text = $content->serialize();
1609                         $txt = $content_text; # clone
1610
1611                         $hook_ok = wfRunHooks( 'ArticleSave', array( &$this, &$user, &$txt, &$summary,
1612                                 $flags & EDIT_MINOR, null, null, &$flags, &$status ) );
1613
1614                         if ( $txt !== $content_text ) {
1615                                 # if the text changed, unserialize the new version to create an updated Content object.
1616                                 $content = $content->getContentHandler()->unserializeContent( $txt );
1617                         }
1618                 }
1619
1620                 if ( !$hook_ok ) {
1621                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1622
1623                         if ( $status->isOK() ) {
1624                                 $status->fatal( 'edit-hook-aborted' );
1625                         }
1626
1627                         wfProfileOut( __METHOD__ );
1628                         return $status;
1629                 }
1630
1631                 # Silently ignore EDIT_MINOR if not allowed
1632                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1633                 $bot = $flags & EDIT_FORCE_BOT;
1634
1635                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1636
1637                 $oldsize = $old_content ? $old_content->getSize() : 0;
1638                 $oldid = $this->getLatest();
1639                 $oldIsRedirect = $this->isRedirect();
1640                 $oldcountable = $this->isCountable();
1641
1642                 $handler = $content->getContentHandler();
1643
1644                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1645                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1646                         if ( !$old_content ) $old_content = null;
1647                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1648                 }
1649
1650                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1651                 $serialized = $editInfo->pst;
1652                 $content = $editInfo->pstContent;
1653                 $newsize =  $content->getSize();
1654
1655                 $dbw = wfGetDB( DB_MASTER );
1656                 $now = wfTimestampNow();
1657                 $this->mTimestamp = $now;
1658
1659                 if ( $flags & EDIT_UPDATE ) {
1660                         # Update article, but only if changed.
1661                         $status->value['new'] = false;
1662
1663                         if ( !$oldid ) {
1664                                 # Article gone missing
1665                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1666                                 $status->fatal( 'edit-gone-missing' );
1667
1668                                 wfProfileOut( __METHOD__ );
1669                                 return $status;
1670                         }
1671
1672                         # Make sure the revision is either completely inserted or not inserted at all
1673                         if ( !$wgDBtransactions ) {
1674                                 $userAbort = ignore_user_abort( true );
1675                         }
1676
1677                         $revision = new Revision( array(
1678                                 'page'       => $this->getId(),
1679                                 'comment'    => $summary,
1680                                 'minor_edit' => $isminor,
1681                                 'text'       => $serialized,
1682                                 'len'        => $newsize,
1683                                 'parent_id'  => $oldid,
1684                                 'user'       => $user->getId(),
1685                                 'user_text'  => $user->getName(),
1686                                 'timestamp'  => $now,
1687                                 'content_model' => $content->getModel(),
1688                                 'content_format' => $serialisation_format,
1689                         ) );
1690
1691                         $changed = !$content->equals( $old_content );
1692
1693                         if ( $changed ) {
1694                                 // TODO: validate!
1695                                 if ( $content->isValid() ) {
1696
1697                                 }
1698
1699                                 $dbw->begin( __METHOD__ );
1700                                 $revisionId = $revision->insertOn( $dbw );
1701
1702                                 # Update page
1703                                 #
1704                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1705                                 # during the course of this function. This makes sure that EditPage can detect
1706                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1707                                 # before this function is called. A previous function used a separate query, this
1708                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1709                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1710
1711                                 if ( !$ok ) {
1712                                         /* Belated edit conflict! Run away!! */
1713                                         $status->fatal( 'edit-conflict' );
1714
1715                                         # Delete the invalid revision if the DB is not transactional
1716                                         if ( !$wgDBtransactions ) {
1717                                                 $dbw->delete( 'revision', array( 'rev_id' => $revisionId ), __METHOD__ );
1718                                         }
1719
1720                                         $revisionId = 0;
1721                                         $dbw->rollback( __METHOD__ );
1722                                 } else {
1723                                         global $wgUseRCPatrol;
1724                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1725                                         # Update recentchanges
1726                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1727                                                 # Mark as patrolled if the user can do so
1728                                                 $patrolled = $wgUseRCPatrol && !count(
1729                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1730                                                 # Add RC row to the DB
1731                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1732                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1733                                                         $revisionId, $patrolled
1734                                                 );
1735
1736                                                 # Log auto-patrolled edits
1737                                                 if ( $patrolled ) {
1738                                                         PatrolLog::record( $rc, true, $user );
1739                                                 }
1740                                         }
1741                                         $user->incEditCount();
1742                                         $dbw->commit( __METHOD__ );
1743                                 }
1744                         } else {
1745                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1746                                 // related variables correctly
1747                                 $revision->setId( $this->getLatest() );
1748                         }
1749
1750                         if ( !$wgDBtransactions ) {
1751                                 ignore_user_abort( $userAbort );
1752                         }
1753
1754                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1755                         if ( !$status->isOK() ) {
1756                                 wfProfileOut( __METHOD__ );
1757                                 return $status;
1758                         }
1759
1760                         // TODO: create content diff to pass to update objects that might need it
1761
1762                         # Update links tables, site stats, etc.
1763                         $this->doEditUpdates(
1764                                 $revision,
1765                                 $user,
1766                                 array(
1767                                         'changed' => $changed,
1768                                         'oldcountable' => $oldcountable
1769                                 )
1770                         );
1771
1772                         if ( !$changed ) {
1773                                 $status->warning( 'edit-no-change' );
1774                                 $revision = null;
1775                                 // Update page_touched, this is usually implicit in the page update
1776                                 // Other cache updates are done in onArticleEdit()
1777                                 $this->mTitle->invalidateCache();
1778                         }
1779                 } else {
1780                         # Create new article
1781                         $status->value['new'] = true;
1782
1783                         $dbw->begin( __METHOD__ );
1784
1785                         # Add the page record; stake our claim on this title!
1786                         # This will return false if the article already exists
1787                         $newid = $this->insertOn( $dbw );
1788
1789                         if ( $newid === false ) {
1790                                 $dbw->rollback( __METHOD__ );
1791                                 $status->fatal( 'edit-already-exists' );
1792
1793                                 wfProfileOut( __METHOD__ );
1794                                 return $status;
1795                         }
1796
1797                         # Save the revision text...
1798                         $revision = new Revision( array(
1799                                 'page'       => $newid,
1800                                 'comment'    => $summary,
1801                                 'minor_edit' => $isminor,
1802                                 'text'       => $serialized,
1803                                 'len'        => $newsize,
1804                                 'user'       => $user->getId(),
1805                                 'user_text'  => $user->getName(),
1806                                 'timestamp'  => $now,
1807                                 'content_model' => $content->getModel(),
1808                                 'content_format' => $serialisation_format,
1809                         ) );
1810                         $revisionId = $revision->insertOn( $dbw );
1811
1812                         # Update the page record with revision data
1813                         $this->updateRevisionOn( $dbw, $revision, 0 );
1814
1815                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1816
1817                         # Update recentchanges
1818                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1819                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1820
1821                                 # Mark as patrolled if the user can do so
1822                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1823                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1824                                 # Add RC row to the DB
1825                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1826                                         '', $content->getSize(), $revisionId, $patrolled );
1827
1828                                 # Log auto-patrolled edits
1829                                 if ( $patrolled ) {
1830                                         PatrolLog::record( $rc, true, $user );
1831                                 }
1832                         }
1833                         $user->incEditCount();
1834                         $dbw->commit( __METHOD__ );
1835
1836                         # Update links, etc.
1837                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1838
1839                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $serialized, $summary,
1840                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1841
1842                         wfRunHooks( 'ArticleContentInsertComplete', array( &$this, &$user, $content, $summary,
1843                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1844                 }
1845
1846                 # Do updates right now unless deferral was requested
1847                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1848                         DeferredUpdates::doUpdates();
1849                 }
1850
1851                 // Return the new revision (or null) to the caller
1852                 $status->value['revision'] = $revision;
1853
1854                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $serialized, $summary,
1855                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1856
1857                 wfRunHooks( 'ArticleContentSaveComplete', array( &$this, &$user, $content, $summary,
1858                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1859
1860                 # Promote user to any groups they meet the criteria for
1861                 $user->addAutopromoteOnceGroups( 'onEdit' );
1862
1863                 wfProfileOut( __METHOD__ );
1864                 return $status;
1865         }
1866
1867         /**
1868          * Get parser options suitable for rendering the primary article wikitext
1869          * @param User|string $user User object or 'canonical'
1870          * @return ParserOptions
1871          */
1872         public function makeParserOptions( $user ) {
1873                 global $wgContLang;
1874                 if ( $user instanceof User ) { // settings per user (even anons)
1875                         $options = ParserOptions::newFromUser( $user );
1876                 } else { // canonical settings
1877                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
1878                 }
1879                 $options->enableLimitReport(); // show inclusion/loop reports
1880                 $options->setTidy( true ); // fix bad HTML
1881                 return $options;
1882         }
1883
1884         /**
1885          * Prepare text which is about to be saved.
1886          * Returns a stdclass with source, pst and output members
1887          *
1888          * @deprecated in 1.WD: use prepareContentForEdit instead.
1889          */
1890         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1891                 wfDeprecated( __METHOD__, '1.WD' );
1892                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1893                 return $this->prepareContentForEdit( $content, $revid , $user );
1894         }
1895
1896         /**
1897          * Prepare content which is about to be saved.
1898          * Returns a stdclass with source, pst and output members
1899          *
1900          * @param \Content $content
1901          * @param null $revid
1902          * @param null|\User $user
1903          * @param null $serialization_format
1904          *
1905          * @return bool|object
1906          *
1907          * @since 1.WD
1908          */
1909         public function prepareContentForEdit( Content $content, $revid = null, User $user = null, $serialization_format = null ) {
1910                 global $wgParser, $wgContLang, $wgUser;
1911                 $user = is_null( $user ) ? $wgUser : $user;
1912                 // @TODO fixme: check $user->getId() here???
1913
1914                 if ( $this->mPreparedEdit
1915                         && $this->mPreparedEdit->newContent
1916                         && $this->mPreparedEdit->newContent->equals( $content )
1917                         && $this->mPreparedEdit->revid == $revid
1918                         && $this->mPreparedEdit->format == $serialization_format
1919                         #XXX: also check $user here?
1920                 ) {
1921                         // Already prepared
1922                         return $this->mPreparedEdit;
1923                 }
1924
1925                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1926                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1927
1928                 $edit = (object)array();
1929                 $edit->revid = $revid;
1930
1931                 $edit->pstContent = $content->preSaveTransform( $this->mTitle, $user, $popts );
1932                 $edit->pst = $edit->pstContent->serialize( $serialization_format );
1933                 $edit->format = $serialization_format;
1934
1935                 $edit->popts = $this->makeParserOptions( 'canonical' );
1936
1937                 // TODO: is there no better way to obtain a context here?
1938                 $context = RequestContext::getMain();
1939                 $context->setTitle( $this->mTitle );
1940                 $edit->output = $edit->pstContent->getParserOutput( $context, $revid, $edit->popts );
1941
1942                 $edit->newContent = $content;
1943                 $edit->oldContent = $this->getContent( Revision::RAW );
1944
1945                 $edit->newText = ContentHandler::getContentText( $edit->newContent ); #FIXME: B/C only! don't use this field!
1946                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : ''; #FIXME: B/C only! don't use this field!
1947
1948                 $this->mPreparedEdit = $edit;
1949
1950                 return $edit;
1951         }
1952
1953         /**
1954          * Do standard deferred updates after page edit.
1955          * Update links tables, site stats, search index and message cache.
1956          * Purges pages that include this page if the text was changed here.
1957          * Every 100th edit, prune the recent changes table.
1958          *
1959          * @param $revision Revision object
1960          * @param $user User object that did the revision
1961          * @param $options Array of options, following indexes are used:
1962          * - changed: boolean, whether the revision changed the content (default true)
1963          * - created: boolean, whether the revision created the page (default false)
1964          * - oldcountable: boolean or null (default null):
1965          *   - boolean: whether the page was counted as an article before that
1966          *     revision, only used in changed is true and created is false
1967          *   - null: don't change the article count
1968          */
1969         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
1970                 global $wgEnableParserCache;
1971
1972                 wfProfileIn( __METHOD__ );
1973
1974                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
1975                 $content = $revision->getContent();
1976
1977                 # Parse the text
1978                 # Be careful not to double-PST: $text is usually already PST-ed once
1979                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
1980                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
1981                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
1982                 } else {
1983                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
1984                         $editInfo = $this->mPreparedEdit;
1985                 }
1986
1987                 # Save it to the parser cache
1988                 if ( $wgEnableParserCache ) {
1989                         $parserCache = ParserCache::singleton();
1990                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
1991                 }
1992
1993                 # Update the links tables and other secondary data
1994                 $updates = $editInfo->output->getSecondaryDataUpdates( $this->mTitle );
1995                 SecondaryDataUpdate::runUpdates( $updates );
1996
1997                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
1998
1999                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2000                         if ( 0 == mt_rand( 0, 99 ) ) {
2001                                 // Flush old entries from the `recentchanges` table; we do this on
2002                                 // random requests so as to avoid an increase in writes for no good reason
2003                                 global $wgRCMaxAge;
2004
2005                                 $dbw = wfGetDB( DB_MASTER );
2006                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2007                                 $dbw->delete(
2008                                         'recentchanges',
2009                                         array( "rc_timestamp < '$cutoff'" ),
2010                                         __METHOD__
2011                                 );
2012                         }
2013                 }
2014
2015                 if ( !$this->mTitle->exists() ) {
2016                         wfProfileOut( __METHOD__ );
2017                         return;
2018                 }
2019
2020                 $id = $this->getId();
2021                 $title = $this->mTitle->getPrefixedDBkey();
2022                 $shortTitle = $this->mTitle->getDBkey();
2023
2024                 if ( !$options['changed'] ) {
2025                         $good = 0;
2026                         $total = 0;
2027                 } elseif ( $options['created'] ) {
2028                         $good = (int)$this->isCountable( $editInfo );
2029                         $total = 1;
2030                 } elseif ( $options['oldcountable'] !== null ) {
2031                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2032                         $total = 0;
2033                 } else {
2034                         $good = 0;
2035                         $total = 0;
2036                 }
2037
2038                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2039                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content->getTextForSearchIndex() ) );
2040
2041                 # If this is another user's talk page, update newtalk.
2042                 # Don't do this if $options['changed'] = false (null-edits) nor if
2043                 # it's a minor edit and the user doesn't want notifications for those.
2044                 if ( $options['changed']
2045                         && $this->mTitle->getNamespace() == NS_USER_TALK
2046                         && $shortTitle != $user->getTitleKey()
2047                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2048                 ) {
2049                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2050                                 $other = User::newFromName( $shortTitle, false );
2051                                 if ( !$other ) {
2052                                         wfDebug( __METHOD__ . ": invalid username\n" );
2053                                 } elseif ( User::isIP( $shortTitle ) ) {
2054                                         // An anonymous user
2055                                         $other->setNewtalk( true );
2056                                 } elseif ( $other->isLoggedIn() ) {
2057                                         $other->setNewtalk( true );
2058                                 } else {
2059                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2060                                 }
2061                         }
2062                 }
2063
2064                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2065                         $msgtext = ContentHandler::getContentText( $content ); #XXX: could skip pseudo-messages like js/css here, based on content model.
2066                         if ( $msgtext === false || $msgtext === null ) $msgtext = '';
2067
2068                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2069                 }
2070
2071                 if( $options['created'] ) {
2072                         self::onArticleCreate( $this->mTitle );
2073                 } else {
2074                         self::onArticleEdit( $this->mTitle );
2075                 }
2076
2077                 wfProfileOut( __METHOD__ );
2078         }
2079
2080         /**
2081          * Edit an article without doing all that other stuff
2082          * The article must already exist; link tables etc
2083          * are not updated, caches are not flushed.
2084          *
2085          * @param $text String: text submitted
2086          * @param $user User The relevant user
2087          * @param $comment String: comment submitted
2088          * @param $minor Boolean: whereas it's a minor modification
2089          *
2090          * @deprecated since 1.WD, use doEditContent() instead.
2091          */
2092         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2093                 wfDeprecated( __METHOD__, "1.WD" );
2094
2095                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2096                 return $this->doQuickEditContent( $content, $user, $comment , $minor );
2097         }
2098
2099         /**
2100          * Edit an article without doing all that other stuff
2101          * The article must already exist; link tables etc
2102          * are not updated, caches are not flushed.
2103          *
2104          * @param $content Content: content submitted
2105          * @param $user User The relevant user
2106          * @param $comment String: comment submitted
2107          * @param $serialisation_format String: format for storing the content in the database
2108          * @param $minor Boolean: whereas it's a minor modification
2109          */
2110         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = 0, $serialisation_format = null ) {
2111                 wfProfileIn( __METHOD__ );
2112
2113                 $serialized = $content->serialize( $serialisation_format );
2114
2115                 $dbw = wfGetDB( DB_MASTER );
2116                 $revision = new Revision( array(
2117                         'page'       => $this->getId(),
2118                         'text'       => $serialized,
2119                         'length'     => $content->getSize(),
2120                         'comment'    => $comment,
2121                         'minor_edit' => $minor ? 1 : 0,
2122                 ) );
2123                 $revision->insertOn( $dbw );
2124                 $this->updateRevisionOn( $dbw, $revision );
2125
2126                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2127
2128                 wfProfileOut( __METHOD__ );
2129         }
2130
2131         /**
2132          * Update the article's restriction field, and leave a log entry.
2133          * This works for protection both existing and non-existing pages.
2134          *
2135          * @param $limit Array: set of restriction keys
2136          * @param $reason String
2137          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2138          * @param $expiry Array: per restriction type expiration
2139          * @param $user User The user updating the restrictions
2140          * @return Status
2141          */
2142         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
2143                 global $wgContLang;
2144
2145                 if ( wfReadOnly() ) {
2146                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2147                 }
2148
2149                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2150
2151                 $id = $this->mTitle->getArticleID();
2152
2153                 if ( !$cascade ) {
2154                         $cascade = false;
2155                 }
2156
2157                 // Take this opportunity to purge out expired restrictions
2158                 Title::purgeExpiredRestrictions();
2159
2160                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2161                 # we expect a single selection, but the schema allows otherwise.
2162                 $isProtected = false;
2163                 $protect = false;
2164                 $changed = false;
2165
2166                 $dbw = wfGetDB( DB_MASTER );
2167
2168                 foreach ( $restrictionTypes as $action ) {
2169                         if ( !isset( $expiry[$action] ) ) {
2170                                 $expiry[$action] = $dbw->getInfinity();
2171                         }
2172                         if ( !isset( $limit[$action] ) ) {
2173                                 $limit[$action] = '';
2174                         } elseif ( $limit[$action] != '' ) {
2175                                 $protect = true;
2176                         }
2177
2178                         # Get current restrictions on $action
2179                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2180                         if ( $current != '' ) {
2181                                 $isProtected = true;
2182                         }
2183
2184                         if ( $limit[$action] != $current ) {
2185                                 $changed = true;
2186                         } elseif ( $limit[$action] != '' ) {
2187                                 # Only check expiry change if the action is actually being
2188                                 # protected, since expiry does nothing on an not-protected
2189                                 # action.
2190                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2191                                         $changed = true;
2192                                 }
2193                         }
2194                 }
2195
2196                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2197                         $changed = true;
2198                 }
2199
2200                 # If nothing's changed, do nothing
2201                 if ( !$changed ) {
2202                         return Status::newGood();
2203                 }
2204
2205                 if ( !$protect ) { # No protection at all means unprotection
2206                         $revCommentMsg = 'unprotectedarticle';
2207                         $logAction = 'unprotect';
2208                 } elseif ( $isProtected ) {
2209                         $revCommentMsg = 'modifiedarticleprotection';
2210                         $logAction = 'modify';
2211                 } else {
2212                         $revCommentMsg = 'protectedarticle';
2213                         $logAction = 'protect';
2214                 }
2215
2216                 $encodedExpiry = array();
2217                 $protectDescription = '';
2218                 foreach ( $limit as $action => $restrictions ) {
2219                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
2220                         if ( $restrictions != '' ) {
2221                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
2222                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2223                                         $protectDescription .= wfMsgForContent( 'protect-expiring',
2224                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2225                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2226                                                 $wgContLang->time( $expiry[$action], false, false ) );
2227                                 } else {
2228                                         $protectDescription .= wfMsgForContent( 'protect-expiry-indefinite' );
2229                                 }
2230
2231                                 $protectDescription .= ') ';
2232                         }
2233                 }
2234                 $protectDescription = trim( $protectDescription );
2235
2236                 if ( $id ) { # Protection of existing page
2237                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2238                                 return Status::newGood();
2239                         }
2240
2241                         # Only restrictions with the 'protect' right can cascade...
2242                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2243                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2244
2245                         # The schema allows multiple restrictions
2246                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2247                                 $cascade = false;
2248                         }
2249
2250                         # Update restrictions table
2251                         foreach ( $limit as $action => $restrictions ) {
2252                                 if ( $restrictions != '' ) {
2253                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2254                                                 array( 'pr_page' => $id,
2255                                                         'pr_type' => $action,
2256                                                         'pr_level' => $restrictions,
2257                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2258                                                         'pr_expiry' => $encodedExpiry[$action]
2259                                                 ),
2260                                                 __METHOD__
2261                                         );
2262                                 } else {
2263                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2264                                                 'pr_type' => $action ), __METHOD__ );
2265                                 }
2266                         }
2267
2268                         # Prepare a null revision to be added to the history
2269                         $editComment = $wgContLang->ucfirst( wfMsgForContent( $revCommentMsg, $this->mTitle->getPrefixedText() ) );
2270                         if ( $reason ) {
2271                                 $editComment .= ": $reason";
2272                         }
2273                         if ( $protectDescription ) {
2274                                 $editComment .= " ($protectDescription)";
2275                         }
2276                         if ( $cascade ) {
2277                                 $editComment .= ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2278                         }
2279
2280                         # Insert a null revision
2281                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2282                         $nullRevId = $nullRevision->insertOn( $dbw );
2283
2284                         $latest = $this->getLatest();
2285                         # Update page record
2286                         $dbw->update( 'page',
2287                                 array( /* SET */
2288                                         'page_touched' => $dbw->timestamp(),
2289                                         'page_restrictions' => '',
2290                                         'page_latest' => $nullRevId
2291                                 ), array( /* WHERE */
2292                                         'page_id' => $id
2293                                 ), __METHOD__
2294                         );
2295
2296                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2297                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2298                 } else { # Protection of non-existing page (also known as "title protection")
2299                         # Cascade protection is meaningless in this case
2300                         $cascade = false;
2301
2302                         if ( $limit['create'] != '' ) {
2303                                 $dbw->replace( 'protected_titles',
2304                                         array( array( 'pt_namespace', 'pt_title' ) ),
2305                                         array(
2306                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2307                                                 'pt_title' => $this->mTitle->getDBkey(),
2308                                                 'pt_create_perm' => $limit['create'],
2309                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
2310                                                 'pt_expiry' => $encodedExpiry['create'],
2311                                                 'pt_user' => $user->getId(),
2312                                                 'pt_reason' => $reason,
2313                                         ), __METHOD__
2314                                 );
2315                         } else {
2316                                 $dbw->delete( 'protected_titles',
2317                                         array(
2318                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2319                                                 'pt_title' => $this->mTitle->getDBkey()
2320                                         ), __METHOD__
2321                                 );
2322                         }
2323                 }
2324
2325                 $this->mTitle->flushRestrictions();
2326
2327                 if ( $logAction == 'unprotect' ) {
2328                         $logParams = array();
2329                 } else {
2330                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
2331                 }
2332
2333                 # Update the protection log
2334                 $log = new LogPage( 'protect' );
2335                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
2336
2337                 return Status::newGood();
2338         }
2339
2340         /**
2341          * Take an array of page restrictions and flatten it to a string
2342          * suitable for insertion into the page_restrictions field.
2343          * @param $limit Array
2344          * @return String
2345          */
2346         protected static function flattenRestrictions( $limit ) {
2347                 if ( !is_array( $limit ) ) {
2348                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2349                 }
2350
2351                 $bits = array();
2352                 ksort( $limit );
2353
2354                 foreach ( $limit as $action => $restrictions ) {
2355                         if ( $restrictions != '' ) {
2356                                 $bits[] = "$action=$restrictions";
2357                         }
2358                 }
2359
2360                 return implode( ':', $bits );
2361         }
2362
2363         /**
2364          * Same as doDeleteArticleReal(), but returns more detailed success/failure status
2365          * Deletes the article with database consistency, writes logs, purges caches
2366          *
2367          * @param $reason string delete reason for deletion log
2368          * @param $suppress int bitfield
2369          *      Revision::DELETED_TEXT
2370          *      Revision::DELETED_COMMENT
2371          *      Revision::DELETED_USER
2372          *      Revision::DELETED_RESTRICTED
2373          * @param $id int article ID
2374          * @param $commit boolean defaults to true, triggers transaction end
2375          * @param &$error Array of errors to append to
2376          * @param $user User The deleting user
2377          * @return boolean true if successful
2378          */
2379         public function doDeleteArticle(
2380                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2381         ) {
2382                 return $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user )
2383                         == WikiPage::DELETE_SUCCESS;
2384         }
2385
2386         /**
2387          * Back-end article deletion
2388          * Deletes the article with database consistency, writes logs, purges caches
2389          *
2390          * @param $reason string delete reason for deletion log
2391          * @param $suppress int bitfield
2392          *      Revision::DELETED_TEXT
2393          *      Revision::DELETED_COMMENT
2394          *      Revision::DELETED_USER
2395          *      Revision::DELETED_RESTRICTED
2396          * @param $id int article ID
2397          * @param $commit boolean defaults to true, triggers transaction end
2398          * @param &$error Array of errors to append to
2399          * @param $user User The deleting user
2400          * @return int: One of WikiPage::DELETE_* constants
2401          */
2402         public function doDeleteArticleReal(
2403                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2404         ) {
2405                 global $wgUser, $wgContentHandlerUseDB;
2406
2407                 wfDebug( __METHOD__ . "\n" );
2408
2409                 if ( $this->mTitle->getDBkey() === '' ) {
2410                         return WikiPage::DELETE_NO_PAGE;
2411                 }
2412
2413                 $user = is_null( $user ) ? $wgUser : $user;
2414                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
2415                         return WikiPage::DELETE_HOOK_ABORTED;
2416                 }
2417
2418                 if ( $id == 0 ) {
2419                         $this->loadPageData( 'forupdate' );
2420                         $id = $this->getID();
2421                         if ( $id == 0 ) {
2422                                 return WikiPage::DELETE_NO_PAGE;
2423                         }
2424                 }
2425
2426                 // Bitfields to further suppress the content
2427                 if ( $suppress ) {
2428                         $bitfield = 0;
2429                         // This should be 15...
2430                         $bitfield |= Revision::DELETED_TEXT;
2431                         $bitfield |= Revision::DELETED_COMMENT;
2432                         $bitfield |= Revision::DELETED_USER;
2433                         $bitfield |= Revision::DELETED_RESTRICTED;
2434                 } else {
2435                         $bitfield = 'rev_deleted';
2436                 }
2437
2438                 $dbw = wfGetDB( DB_MASTER );
2439                 $dbw->begin( __METHOD__ );
2440                 // For now, shunt the revision data into the archive table.
2441                 // Text is *not* removed from the text table; bulk storage
2442                 // is left intact to avoid breaking block-compression or
2443                 // immutable storage schemes.
2444                 //
2445                 // For backwards compatibility, note that some older archive
2446                 // table entries will have ar_text and ar_flags fields still.
2447                 //
2448                 // In the future, we may keep revisions and mark them with
2449                 // the rev_deleted field, which is reserved for this purpose.
2450
2451                 $row = array(
2452                         'ar_namespace'  => 'page_namespace',
2453                         'ar_title'      => 'page_title',
2454                         'ar_comment'    => 'rev_comment',
2455                         'ar_user'       => 'rev_user',
2456                         'ar_user_text'  => 'rev_user_text',
2457                         'ar_timestamp'  => 'rev_timestamp',
2458                         'ar_minor_edit' => 'rev_minor_edit',
2459                         'ar_rev_id'     => 'rev_id',
2460                         'ar_parent_id'  => 'rev_parent_id',
2461                         'ar_text_id'    => 'rev_text_id',
2462                         'ar_text'       => '\'\'', // Be explicit to appease
2463                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2464                         'ar_len'        => 'rev_len',
2465                         'ar_page_id'    => 'page_id',
2466                         'ar_deleted'    => $bitfield,
2467                         'ar_sha1'       => 'rev_sha1',
2468                 );
2469
2470                 if ( $wgContentHandlerUseDB ) {
2471                         $row[ 'ar_content_model' ] = 'rev_content_model';
2472                         $row[ 'ar_content_format' ] = 'rev_content_format';
2473                 }
2474
2475                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2476                         $row,
2477                         array(
2478                                 'page_id' => $id,
2479                                 'page_id = rev_page'
2480                         ), __METHOD__
2481                 );
2482
2483                 # Now that it's safely backed up, delete it
2484                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2485                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleID() uses slave, could be laggy
2486
2487                 if ( !$ok ) {
2488                         $dbw->rollback( __METHOD__ );
2489                         return WikiPage::DELETE_NO_REVISIONS;
2490                 }
2491
2492                 # update site status
2493                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2494
2495                 # remove secondary indexes, etc
2496                 $handler = $this->getContentHandler();
2497                 $updates = $handler->getDeletionUpdates( $this );
2498                 SecondaryDataUpdate::runUpdates( $updates );
2499
2500                 # Clear caches
2501                 WikiPage::onArticleDelete( $this->mTitle );
2502
2503                 # Reset this object
2504                 $this->clear();
2505
2506                 # Clear the cached article id so the interface doesn't act like we exist
2507                 $this->mTitle->resetArticleID( 0 );
2508
2509                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2510                 $logtype = $suppress ? 'suppress' : 'delete';
2511
2512                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2513                 $logEntry->setPerformer( $user );
2514                 $logEntry->setTarget( $this->mTitle );
2515                 $logEntry->setComment( $reason );
2516                 $logid = $logEntry->insert();
2517                 $logEntry->publish( $logid );
2518
2519                 if ( $commit ) {
2520                         $dbw->commit( __METHOD__ );
2521                 }
2522
2523                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
2524                 return WikiPage::DELETE_SUCCESS;
2525         }
2526
2527         /**
2528          * Roll back the most recent consecutive set of edits to a page
2529          * from the same user; fails if there are no eligible edits to
2530          * roll back to, e.g. user is the sole contributor. This function
2531          * performs permissions checks on $user, then calls commitRollback()
2532          * to do the dirty work
2533          *
2534          * @todo: seperate the business/permission stuff out from backend code
2535          *
2536          * @param $fromP String: Name of the user whose edits to rollback.
2537          * @param $summary String: Custom summary. Set to default summary if empty.
2538          * @param $token String: Rollback token.
2539          * @param $bot Boolean: If true, mark all reverted edits as bot.
2540          *
2541          * @param $resultDetails Array: contains result-specific array of additional values
2542          *    'alreadyrolled' : 'current' (rev)
2543          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2544          *
2545          * @param $user User The user performing the rollback
2546          * @return array of errors, each error formatted as
2547          *   array(messagekey, param1, param2, ...).
2548          * On success, the array is empty.  This array can also be passed to
2549          * OutputPage::showPermissionsErrorPage().
2550          */
2551         public function doRollback(
2552                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2553         ) {
2554                 $resultDetails = null;
2555
2556                 # Check permissions
2557                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2558                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2559                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2560
2561                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2562                         $errors[] = array( 'sessionfailure' );
2563                 }
2564
2565                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2566                         $errors[] = array( 'actionthrottledtext' );
2567                 }
2568
2569                 # If there were errors, bail out now
2570                 if ( !empty( $errors ) ) {
2571                         return $errors;
2572                 }
2573
2574                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2575         }
2576
2577         /**
2578          * Backend implementation of doRollback(), please refer there for parameter
2579          * and return value documentation
2580          *
2581          * NOTE: This function does NOT check ANY permissions, it just commits the
2582          * rollback to the DB. Therefore, you should only call this function direct-
2583          * ly if you want to use custom permissions checks. If you don't, use
2584          * doRollback() instead.
2585          * @param $fromP String: Name of the user whose edits to rollback.
2586          * @param $summary String: Custom summary. Set to default summary if empty.
2587          * @param $bot Boolean: If true, mark all reverted edits as bot.
2588          *
2589          * @param $resultDetails Array: contains result-specific array of additional values
2590          * @param $guser User The user performing the rollback
2591          * @return array
2592          */
2593         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2594                 global $wgUseRCPatrol, $wgContLang;
2595
2596                 $dbw = wfGetDB( DB_MASTER );
2597
2598                 if ( wfReadOnly() ) {
2599                         return array( array( 'readonlytext' ) );
2600                 }
2601
2602                 # Get the last editor
2603                 $current = $this->getRevision();
2604                 if ( is_null( $current ) ) {
2605                         # Something wrong... no page?
2606                         return array( array( 'notanarticle' ) );
2607                 }
2608
2609                 $from = str_replace( '_', ' ', $fromP );
2610                 # User name given should match up with the top revision.
2611                 # If the user was deleted then $from should be empty.
2612                 if ( $from != $current->getUserText() ) {
2613                         $resultDetails = array( 'current' => $current );
2614                         return array( array( 'alreadyrolled',
2615                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2616                                 htmlspecialchars( $fromP ),
2617                                 htmlspecialchars( $current->getUserText() )
2618                         ) );
2619                 }
2620
2621                 # Get the last edit not by this guy...
2622                 # Note: these may not be public values
2623                 $user = intval( $current->getRawUser() );
2624                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2625                 $s = $dbw->selectRow( 'revision',
2626                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2627                         array( 'rev_page' => $current->getPage(),
2628                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2629                         ), __METHOD__,
2630                         array( 'USE INDEX' => 'page_timestamp',
2631                                 'ORDER BY' => 'rev_timestamp DESC' )
2632                         );
2633                 if ( $s === false ) {
2634                         # No one else ever edited this page
2635                         return array( array( 'cantrollback' ) );
2636                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2637                         # Only admins can see this text
2638                         return array( array( 'notvisiblerev' ) );
2639                 }
2640
2641                 $set = array();
2642                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2643                         # Mark all reverted edits as bot
2644                         $set['rc_bot'] = 1;
2645                 }
2646
2647                 if ( $wgUseRCPatrol ) {
2648                         # Mark all reverted edits as patrolled
2649                         $set['rc_patrolled'] = 1;
2650                 }
2651
2652                 if ( count( $set ) ) {
2653                         $dbw->update( 'recentchanges', $set,
2654                                 array( /* WHERE */
2655                                         'rc_cur_id' => $current->getPage(),
2656                                         'rc_user_text' => $current->getUserText(),
2657                                         "rc_timestamp > '{$s->rev_timestamp}'",
2658                                 ), __METHOD__
2659                         );
2660                 }
2661
2662                 # Generate the edit summary if necessary
2663                 $target = Revision::newFromId( $s->rev_id );
2664                 if ( empty( $summary ) ) {
2665                         if ( $from == '' ) { // no public user name
2666                                 $summary = wfMsgForContent( 'revertpage-nouser' );
2667                         } else {
2668                                 $summary = wfMsgForContent( 'revertpage' );
2669                         }
2670                 }
2671
2672                 # Allow the custom summary to use the same args as the default message
2673                 $args = array(
2674                         $target->getUserText(), $from, $s->rev_id,
2675                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2676                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2677                 );
2678                 $summary = wfMsgReplaceArgs( $summary, $args );
2679
2680                 # Save
2681                 $flags = EDIT_UPDATE;
2682
2683                 if ( $guser->isAllowed( 'minoredit' ) ) {
2684                         $flags |= EDIT_MINOR;
2685                 }
2686
2687                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2688                         $flags |= EDIT_FORCE_BOT;
2689                 }
2690
2691                 # Actually store the edit
2692                 $status = $this->doEditContent( $target->getContent(), $summary, $flags, $target->getId(), $guser );
2693                 if ( !empty( $status->value['revision'] ) ) {
2694                         $revId = $status->value['revision']->getId();
2695                 } else {
2696                         $revId = false;
2697                 }
2698
2699                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2700
2701                 $resultDetails = array(
2702                         'summary' => $summary,
2703                         'current' => $current,
2704                         'target'  => $target,
2705                         'newid'   => $revId
2706                 );
2707
2708                 return array();
2709         }
2710
2711         /**
2712          * The onArticle*() functions are supposed to be a kind of hooks
2713          * which should be called whenever any of the specified actions
2714          * are done.
2715          *
2716          * This is a good place to put code to clear caches, for instance.
2717          *
2718          * This is called on page move and undelete, as well as edit
2719          *
2720          * @param $title Title object
2721          */
2722         public static function onArticleCreate( $title ) {
2723                 # Update existence markers on article/talk tabs...
2724                 if ( $title->isTalkPage() ) {
2725                         $other = $title->getSubjectPage();
2726                 } else {
2727                         $other = $title->getTalkPage();
2728                 }
2729
2730                 $other->invalidateCache();
2731                 $other->purgeSquid();
2732
2733                 $title->touchLinks();
2734                 $title->purgeSquid();
2735                 $title->deleteTitleProtection();
2736         }
2737
2738         /**
2739          * Clears caches when article is deleted
2740          *
2741          * @param $title Title
2742          */
2743         public static function onArticleDelete( $title ) {
2744                 # Update existence markers on article/talk tabs...
2745                 if ( $title->isTalkPage() ) {
2746                         $other = $title->getSubjectPage();
2747                 } else {
2748                         $other = $title->getTalkPage();
2749                 }
2750
2751                 $other->invalidateCache();
2752                 $other->purgeSquid();
2753
2754                 $title->touchLinks();
2755                 $title->purgeSquid();
2756
2757                 # File cache
2758                 HTMLFileCache::clearFileCache( $title );
2759
2760                 # Messages
2761                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2762                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2763                 }
2764
2765                 # Images
2766                 if ( $title->getNamespace() == NS_FILE ) {
2767                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2768                         $update->doUpdate();
2769                 }
2770
2771                 # User talk pages
2772                 if ( $title->getNamespace() == NS_USER_TALK ) {
2773                         $user = User::newFromName( $title->getText(), false );
2774                         if ( $user ) {
2775                                 $user->setNewtalk( false );
2776                         }
2777                 }
2778
2779                 # Image redirects
2780                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2781         }
2782
2783         /**
2784          * Purge caches on page update etc
2785          *
2786          * @param $title Title object
2787          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2788          */
2789         public static function onArticleEdit( $title ) {
2790                 // Invalidate caches of articles which include this page
2791                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2792
2793
2794                 // Invalidate the caches of all pages which redirect here
2795                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2796
2797                 # Purge squid for this page only
2798                 $title->purgeSquid();
2799
2800                 # Clear file cache for this page only
2801                 HTMLFileCache::clearFileCache( $title );
2802         }
2803
2804         /**#@-*/
2805
2806         /**
2807          * Returns a list of hidden categories this page is a member of.
2808          * Uses the page_props and categorylinks tables.
2809          *
2810          * @return Array of Title objects
2811          */
2812         public function getHiddenCategories() {
2813                 $result = array();
2814                 $id = $this->mTitle->getArticleID();
2815
2816                 if ( $id == 0 ) {
2817                         return array();
2818                 }
2819
2820                 $dbr = wfGetDB( DB_SLAVE );
2821                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2822                         array( 'cl_to' ),
2823                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2824                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2825                         __METHOD__ );
2826
2827                 if ( $res !== false ) {
2828                         foreach ( $res as $row ) {
2829                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2830                         }
2831                 }
2832
2833                 return $result;
2834         }
2835
2836         /**
2837         * Return an applicable autosummary if one exists for the given edit.
2838         * @param $oldtext String|null: the previous text of the page.
2839         * @param $newtext String|null: The submitted text of the page.
2840         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2841         * @return string An appropriate autosummary, or an empty string.
2842         * @deprecated since 1.WD, use ContentHandler::getAutosummary() instead
2843         */
2844         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2845                 # NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
2846
2847                 wfDeprecated( __METHOD__, '1.WD' );
2848
2849                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
2850                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
2851                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
2852
2853                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
2854         }
2855
2856         /**
2857          * Auto-generates a deletion reason
2858          *
2859          * @param &$hasHistory Boolean: whether the page has a history
2860          * @return mixed String containing deletion reason or empty string, or boolean false
2861          *    if no revision occurred
2862          * @deprecated since 1.WD, use ContentHandler::getAutoDeleteReason() instead
2863          */
2864         public function getAutoDeleteReason( &$hasHistory ) {
2865                 #NOTE: stub for backwards-compatibility.
2866
2867                 wfDeprecated( __METHOD__, '1.WD' );
2868
2869                 $handler = ContentHandler::getForTitle( $this->getTitle() );
2870                 $handler->getAutoDeleteReason( $this->getTitle(), $hasHistory );
2871                 global $wgContLang;
2872
2873                 // Get the last revision
2874                 $rev = $this->getRevision();
2875
2876                 if ( is_null( $rev ) ) {
2877                         return false;
2878                 }
2879
2880                 // Get the article's contents
2881                 $contents = $rev->getText();
2882                 $blank = false;
2883
2884                 // If the page is blank, use the text from the previous revision,
2885                 // which can only be blank if there's a move/import/protect dummy revision involved
2886                 if ( $contents == '' ) {
2887                         $prev = $rev->getPrevious();
2888
2889                         if ( $prev )    {
2890                                 $contents = $prev->getText();
2891                                 $blank = true;
2892                         }
2893                 }
2894
2895                 $dbw = wfGetDB( DB_MASTER );
2896
2897                 // Find out if there was only one contributor
2898                 // Only scan the last 20 revisions
2899                 $res = $dbw->select( 'revision', 'rev_user_text',
2900                         array( 'rev_page' => $this->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
2901                         __METHOD__,
2902                         array( 'LIMIT' => 20 )
2903                 );
2904
2905                 if ( $res === false ) {
2906                         // This page has no revisions, which is very weird
2907                         return false;
2908                 }
2909
2910                 $hasHistory = ( $res->numRows() > 1 );
2911                 $row = $dbw->fetchObject( $res );
2912
2913                 if ( $row ) { // $row is false if the only contributor is hidden
2914                         $onlyAuthor = $row->rev_user_text;
2915                         // Try to find a second contributor
2916                         foreach ( $res as $row ) {
2917                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
2918                                         $onlyAuthor = false;
2919                                         break;
2920                                 }
2921                         }
2922                 } else {
2923                         $onlyAuthor = false;
2924                 }
2925
2926                 // Generate the summary with a '$1' placeholder
2927                 if ( $blank ) {
2928                         // The current revision is blank and the one before is also
2929                         // blank. It's just not our lucky day
2930                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
2931                 } else {
2932                         if ( $onlyAuthor ) {
2933                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
2934                         } else {
2935                                 $reason = wfMsgForContent( 'excontent', '$1' );
2936                         }
2937                 }
2938
2939                 if ( $reason == '-' ) {
2940                         // Allow these UI messages to be blanked out cleanly
2941                         return '';
2942                 }
2943
2944                 // Replace newlines with spaces to prevent uglyness
2945                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
2946                 // Calculate the maximum amount of chars to get
2947                 // Max content length = max comment length - length of the comment (excl. $1)
2948                 $maxLength = 255 - ( strlen( $reason ) - 2 );
2949                 $contents = $wgContLang->truncate( $contents, $maxLength );
2950                 // Remove possible unfinished links
2951                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
2952                 // Now replace the '$1' placeholder
2953                 $reason = str_replace( '$1', $contents, $reason );
2954
2955                 return $reason;
2956         }
2957
2958         /**
2959          * Update all the appropriate counts in the category table, given that
2960          * we've added the categories $added and deleted the categories $deleted.
2961          *
2962          * @param $added array   The names of categories that were added
2963          * @param $deleted array The names of categories that were deleted
2964          */
2965         public function updateCategoryCounts( $added, $deleted ) {
2966                 $ns = $this->mTitle->getNamespace();
2967                 $dbw = wfGetDB( DB_MASTER );
2968
2969                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2970                 # exist, we might legitimately not create it, but it's simpler to just
2971                 # create it and then give it a negative value, since the value is bogus
2972                 # anyway.
2973                 #
2974                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2975                 $insertCats = array_merge( $added, $deleted );
2976                 if ( !$insertCats ) {
2977                         # Okay, nothing to do
2978                         return;
2979                 }
2980
2981                 $insertRows = array();
2982
2983                 foreach ( $insertCats as $cat ) {
2984                         $insertRows[] = array(
2985                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2986                                 'cat_title' => $cat
2987                         );
2988                 }
2989                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2990
2991                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2992                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2993
2994                 if ( $ns == NS_CATEGORY ) {
2995                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2996                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2997                 } elseif ( $ns == NS_FILE ) {
2998                         $addFields[]    = 'cat_files = cat_files + 1';
2999                         $removeFields[] = 'cat_files = cat_files - 1';
3000                 }
3001
3002                 if ( $added ) {
3003                         $dbw->update(
3004                                 'category',
3005                                 $addFields,
3006                                 array( 'cat_title' => $added ),
3007                                 __METHOD__
3008                         );
3009                 }
3010
3011                 if ( $deleted ) {
3012                         $dbw->update(
3013                                 'category',
3014                                 $removeFields,
3015                                 array( 'cat_title' => $deleted ),
3016                                 __METHOD__
3017                         );
3018                 }
3019         }
3020
3021         /**
3022          * Updates cascading protections
3023          *
3024          * @param $parserOutput ParserOutput object for the current version
3025          */
3026         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
3027                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
3028                         return;
3029                 }
3030
3031                 // templatelinks table may have become out of sync,
3032                 // especially if using variable-based transclusions.
3033                 // For paranoia, check if things have changed and if
3034                 // so apply updates to the database. This will ensure
3035                 // that cascaded protections apply as soon as the changes
3036                 // are visible.
3037
3038                 # Get templates from templatelinks
3039                 $id = $this->mTitle->getArticleID();
3040
3041                 $tlTemplates = array();
3042
3043                 $dbr = wfGetDB( DB_SLAVE );
3044                 $res = $dbr->select( array( 'templatelinks' ),
3045                         array( 'tl_namespace', 'tl_title' ),
3046                         array( 'tl_from' => $id ),
3047                         __METHOD__
3048                 );
3049
3050                 foreach ( $res as $row ) {
3051                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3052                 }
3053
3054                 # Get templates from parser output.
3055                 $poTemplates = array();
3056                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3057                         foreach ( $templates as $dbk => $id ) {
3058                                 $poTemplates["$ns:$dbk"] = true;
3059                         }
3060                 }
3061
3062                 # Get the diff
3063                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3064
3065                 if ( count( $templates_diff ) > 0 ) {
3066                         # Whee, link updates time.
3067                         # Note: we are only interested in links here. We don't need to get other SecondaryDataUpdate items from the parser output.
3068                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3069                         $u->doUpdate();
3070                 }
3071         }
3072
3073         /**
3074          * Return a list of templates used by this article.
3075          * Uses the templatelinks table
3076          *
3077          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
3078          * @return Array of Title objects
3079          */
3080         public function getUsedTemplates() {
3081                 return $this->mTitle->getTemplateLinksFrom();
3082         }
3083
3084         /**
3085          * Perform article updates on a special page creation.
3086          *
3087          * @param $rev Revision object
3088          *
3089          * @todo This is a shitty interface function. Kill it and replace the
3090          * other shitty functions like doEditUpdates and such so it's not needed
3091          * anymore.
3092          * @deprecated since 1.18, use doEditUpdates()
3093          */
3094         public function createUpdates( $rev ) {
3095                 wfDeprecated( __METHOD__, '1.18' );
3096                 global $wgUser;
3097                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
3098         }
3099
3100         /**
3101          * This function is called right before saving the wikitext,
3102          * so we can do things like signatures and links-in-context.
3103          *
3104          * @deprecated in 1.19; use Parser::preSaveTransform() instead
3105          * @param $text String article contents
3106          * @param $user User object: user doing the edit
3107          * @param $popts ParserOptions object: parser options, default options for
3108          *               the user loaded if null given
3109          * @return string article contents with altered wikitext markup (signatures
3110          *      converted, {{subst:}}, templates, etc.)
3111          */
3112         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3113                 global $wgParser, $wgUser;
3114
3115                 wfDeprecated( __METHOD__, '1.19' );
3116
3117                 $user = is_null( $user ) ? $wgUser : $user;
3118
3119                 if ( $popts === null ) {
3120                         $popts = ParserOptions::newFromUser( $user );
3121                 }
3122
3123                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3124         }
3125
3126         /**
3127          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
3128          *
3129          * @deprecated in 1.19; use Title::isBigDeletion() instead.
3130          * @return bool
3131          */
3132         public function isBigDeletion() {
3133                 wfDeprecated( __METHOD__, '1.19' );
3134                 return $this->mTitle->isBigDeletion();
3135         }
3136
3137         /**
3138          * Get the  approximate revision count of this page.
3139          *
3140          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
3141          * @return int
3142          */
3143         public function estimateRevisionCount() {
3144                 wfDeprecated( __METHOD__, '1.19' );
3145                 return $this->mTitle->estimateRevisionCount();
3146         }
3147
3148         /**
3149          * Update the article's restriction field, and leave a log entry.
3150          *
3151          * @deprecated since 1.19
3152          * @param $limit Array: set of restriction keys
3153          * @param $reason String
3154          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
3155          * @param $expiry Array: per restriction type expiration
3156          * @param $user User The user updating the restrictions
3157          * @return bool true on success
3158          */
3159         public function updateRestrictions(
3160                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3161         ) {
3162                 global $wgUser;
3163
3164                 $user = is_null( $user ) ? $wgUser : $user;
3165
3166                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3167         }
3168
3169         /**
3170          * @deprecated since 1.18
3171          */
3172         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3173                 wfDeprecated( __METHOD__, '1.18' );
3174                 global $wgUser;
3175                 return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
3176         }
3177
3178         /**
3179          * @deprecated since 1.18
3180          */
3181         public function viewUpdates() {
3182                 wfDeprecated( __METHOD__, '1.18' );
3183                 global $wgUser;
3184                 return $this->doViewUpdates( $wgUser );
3185         }
3186
3187         /**
3188          * @deprecated since 1.18
3189          * @return bool
3190          */
3191         public function useParserCache( $oldid ) {
3192                 wfDeprecated( __METHOD__, '1.18' );
3193                 global $wgUser;
3194                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
3195         }
3196 }
3197
3198 class PoolWorkArticleView extends PoolCounterWork {
3199
3200         /**
3201          * @var Page
3202          */
3203         private $page;
3204
3205         /**
3206          * @var string
3207          */
3208         private $cacheKey;
3209
3210         /**
3211          * @var integer
3212          */
3213         private $revid;
3214
3215         /**
3216          * @var ParserOptions
3217          */
3218         private $parserOptions;
3219
3220         /**
3221          * @var string|null
3222          */
3223         private $text;
3224
3225         /**
3226          * @var ParserOutput|bool
3227          */
3228         private $parserOutput = false;
3229
3230         /**
3231          * @var bool
3232          */
3233         private $isDirty = false;
3234
3235         /**
3236          * @var Status|bool
3237          */
3238         private $error = false;
3239
3240         /**
3241          * Constructor
3242          *
3243          * @param $page Page
3244          * @param $revid Integer: ID of the revision being parsed
3245          * @param $useParserCache Boolean: whether to use the parser cache
3246          * @param $parserOptions parserOptions to use for the parse operation
3247          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
3248          * @param $context IContextSource context for parsing
3249          */
3250         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null, IContextSource $context = null ) {
3251                 if ( is_string($content) ) { #BC: old style call
3252                         $modelId = $page->getRevision()->getContentModel();
3253                         $format = $page->getRevision()->getContentFormat();
3254                         $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelId, $format );
3255                 }
3256
3257                 if ( is_null( $context ) ) {
3258                         $context = RequestContext::getMain();
3259                         #XXX: clone and then set title?
3260                 }
3261
3262                 $this->page = $page;
3263                 $this->revid = $revid;
3264                 $this->context = $context;
3265                 $this->cacheable = $useParserCache;
3266                 $this->parserOptions = $parserOptions;
3267                 $this->content = $content;
3268                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3269                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3270         }
3271
3272         /**
3273          * Get the ParserOutput from this object, or false in case of failure
3274          *
3275          * @return ParserOutput
3276          */
3277         public function getParserOutput() {
3278                 return $this->parserOutput;
3279         }
3280
3281         /**
3282          * Get whether the ParserOutput is a dirty one (i.e. expired)
3283          *
3284          * @return bool
3285          */
3286         public function getIsDirty() {
3287                 return $this->isDirty;
3288         }
3289
3290         /**
3291          * Get a Status object in case of error or false otherwise
3292          *
3293          * @return Status|bool
3294          */
3295         public function getError() {
3296                 return $this->error;
3297         }
3298
3299         /**
3300          * @return bool
3301          */
3302         function doWork() {
3303                 global $wgUseFileCache;
3304
3305                 // @todo: several of the methods called on $this->page are not declared in Page, but present in WikiPage and delegated by Article.
3306
3307                 $isCurrent = $this->revid === $this->page->getLatest();
3308
3309                 if ( $this->content !== null ) {
3310                         $content = $this->content;
3311                 } elseif ( $isCurrent ) {
3312                         $content = $this->page->getContent( Revision::RAW ); #XXX: why use RAW audience here, and PUBLIC (default) below?
3313                 } else {
3314                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3315                         if ( $rev === null ) {
3316                                 return false;
3317                         }
3318                         $content = $rev->getContent(); #XXX: why use PUBLIC audience here (default), and RAW above?
3319                 }
3320
3321                 $time = - microtime( true );
3322                 // TODO: page might not have this method? Hard to tell what page is supposed to be here...
3323                 $this->parserOutput = $content->getParserOutput( $this->context, $this->revid, $this->parserOptions );
3324                 $time += microtime( true );
3325
3326                 # Timing hack
3327                 if ( $time > 3 ) {
3328                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3329                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3330                 }
3331
3332                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
3333                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
3334                 }
3335
3336                 // Make sure file cache is not used on uncacheable content.
3337                 // Output that has magic words in it can still use the parser cache
3338                 // (if enabled), though it will generally expire sooner.
3339                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3340                         $wgUseFileCache = false;
3341                 }
3342
3343                 if ( $isCurrent ) {
3344                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3345                 }
3346
3347                 return true;
3348         }
3349
3350         /**
3351          * @return bool
3352          */
3353         function getCachedWork() {
3354                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3355
3356                 if ( $this->parserOutput === false ) {
3357                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3358                         return false;
3359                 } else {
3360                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3361                         return true;
3362                 }
3363         }
3364
3365         /**
3366          * @return bool
3367          */
3368         function fallback() {
3369                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3370
3371                 if ( $this->parserOutput === false ) {
3372                         wfDebugLog( 'dirty', "dirty missing\n" );
3373                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3374                         return false;
3375                 } else {
3376                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3377                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
3378                         $this->isDirty = true;
3379                         return true;
3380                 }
3381         }
3382
3383         /**
3384          * @param $status Status
3385          * @return bool
3386          */
3387         function error( $status ) {
3388                 $this->error = $status;
3389                 return false;
3390         }
3391 }
3392