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          * @return void
 261          */
 262         public function clear() {
 263                 $this->mDataLoaded = false;
 264                 $this->mDataLoadedFrom = self::DATA_NOT_LOADED;
 265
 266                 $this->clearCacheFields();
 267         }
 268
 269         /**
 270          * Clear the object cache fields
 271          * @return void
 272          */
 273         protected function clearCacheFields() {
 274                 $this->mCounter = null;
 275                 $this->mRedirectTarget = null; # Title object if set
 276                 $this->mLastRevision = null; # Latest revision
 277                 $this->mTouched = '19700101000000';
 278                 $this->mTimestamp = '';
 279                 $this->mIsRedirect = false;
 280                 $this->mLatest = false;
 281                 $this->mPreparedEdit = false;
 282         }
 283
 284         /**
 285          * Return the list of revision fields that should be selected to create
 286          * a new page.
 287          *
 288          * @return array
 289          */
 290         public static function selectFields() {
 291                 global $wgContentHandlerUseDB;
 292
 293                 $fields = array(
 294                         'page_id',
 295                         'page_namespace',
 296                         'page_title',
 297                         'page_restrictions',
 298                         'page_counter',
 299                         'page_is_redirect',
 300                         'page_is_new',
 301                         'page_random',
 302                         'page_touched',
 303                         'page_latest',
 304                         'page_len',
 305                 );
 306
 307                 if ( $wgContentHandlerUseDB ) {
 308                         $fields[] = 'page_content_model';
 309                 }
 310
 311                 return $fields;
 312         }
 313
 314         /**
 315          * Fetch a page record with the given conditions
 316          * @param $dbr DatabaseBase object
 317          * @param $conditions Array
 318          * @param $options Array
 319          * @return mixed Database result resource, or false on failure
 320          */
 321         protected function pageData( $dbr, $conditions, $options = array() ) {
 322                 $fields = self::selectFields();
 323
 324                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 325
 326                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 327
 328                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 329
 330                 return $row;
 331         }
 332
 333         /**
 334          * Fetch a page record matching the Title object's namespace and title
 335          * using a sanitized title string
 336          *
 337          * @param $dbr DatabaseBase object
 338          * @param $title Title object
 339          * @param $options Array
 340          * @return mixed Database result resource, or false on failure
 341          */
 342         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 343                 return $this->pageData( $dbr, array(
 344                         'page_namespace' => $title->getNamespace(),
 345                         'page_title'     => $title->getDBkey() ), $options );
 346         }
 347
 348         /**
 349          * Fetch a page record matching the requested ID
 350          *
 351          * @param $dbr DatabaseBase
 352          * @param $id Integer
 353          * @param $options Array
 354          * @return mixed Database result resource, or false on failure
 355          */
 356         public function pageDataFromId( $dbr, $id, $options = array() ) {
 357                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 358         }
 359
 360         /**
 361          * Set the general counter, title etc data loaded from
 362          * some source.
 363          *
 364          * @param $from object|string|int One of the following:
 365          *        - A DB query result object
 366          *        - "fromdb" or self::DATA_FROM_SLAVE to get from a slave DB
 367          *        - "fromdbmaster" or self::DATA_FROM_MASTER to get from the master DB
 368          *        - "forupdate"  or self::DATA_FOR_UPDATE to get from the master DB using SELECT FOR UPDATE
 369          *
 370          * @return void
 371          */
 372         public function loadPageData( $from = 'fromdb' ) {
 373                 $from = self::convertSelectType( $from );
 374                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 375                         // We already have the data from the correct location, no need to load it twice.
 376                         return;
 377                 }
 378
 379                 if ( $from === self::DATA_FOR_UPDATE ) {
 380                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 381                 } elseif ( $from === self::DATA_FROM_MASTER ) {
 382                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 383                 } elseif ( $from === self::DATA_FROM_SLAVE ) {
 384                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 385                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 386                         # Note that DB also stores the master position in the session and checks it.
 387                         $touched = $this->getCachedLastEditTime();
 388                         if ( $touched ) { // key set
 389                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 390                                         $from = self::DATA_FROM_MASTER;
 391                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 392                                 }
 393                         }
 394                 } else {
 395                         // No idea from where the caller got this data, assume slave database.
 396                         $data = $from;
 397                         $from = self::DATA_FROM_SLAVE;
 398                 }
 399
 400                 $this->loadFromRow( $data, $from );
 401         }
 402
 403         /**
 404          * Load the object from a database row
 405          *
 406          * @since 1.20
 407          * @param $data object: database row containing at least fields returned
 408          *        by selectFields()
 409          * @param $from string|int One of the following:
 410          *        - "fromdb" or self::DATA_FROM_SLAVE if the data comes from a slave DB
 411          *        - "fromdbmaster" or self::DATA_FROM_MASTER if the data comes from the master DB
 412          *        - "forupdate"  or self::DATA_FOR_UPDATE if the data comes from from
 413          *          the master DB using SELECT FOR UPDATE
 414          */
 415         public function loadFromRow( $data, $from ) {
 416                 $lc = LinkCache::singleton();
 417
 418                 if ( $data ) {
 419                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 420
 421                         $this->mTitle->loadFromRow( $data );
 422
 423                         # Old-fashioned restrictions
 424                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 425
 426                         $this->mCounter     = intval( $data->page_counter );
 427                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 428                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 429                         $this->mLatest      = intval( $data->page_latest );
 430                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 431                         // Double-check the ID of any cached latest Revision object for consistency.
 432                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 433                                 $this->mLastRevision = null;
 434                                 $this->mTimestamp = '';
 435                         }
 436                 } else {
 437                         $lc->addBadLinkObj( $this->mTitle );
 438
 439                         $this->mTitle->loadFromRow( false );
 440
 441                         $this->clearCacheFields();
 442                 }
 443
 444                 $this->mDataLoaded = true;
 445                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 446         }
 447
 448         /**
 449          * @return int Page ID
 450          */
 451         public function getId() {
 452                 return $this->mTitle->getArticleID();
 453         }
 454
 455         /**
 456          * @return bool Whether or not the page exists in the database
 457          */
 458         public function exists() {
 459                 return $this->mTitle->exists();
 460         }
 461
 462         /**
 463          * Check if this page is something we're going to be showing
 464          * some sort of sensible content for. If we return false, page
 465          * views (plain action=view) will return an HTTP 404 response,
 466          * so spiders and robots can know they're following a bad link.
 467          *
 468          * @return bool
 469          */
 470         public function hasViewableContent() {
 471                 return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
 472         }
 473
 474         /**
 475          * @return int The view count for the page
 476          */
 477         public function getCount() {
 478                 if ( !$this->mDataLoaded ) {
 479                         $this->loadPageData();
 480                 }
 481
 482                 return $this->mCounter;
 483         }
 484
 485         /**
 486          * Tests if the article content represents a redirect
 487          *
 488          * @return bool
 489          */
 490         public function isRedirect( ) {
 491                 $content = $this->getContent();
 492                 if ( !$content ) return false;
 493
 494                 return $content->isRedirect();
 495         }
 496
 497         /**
 498          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 499          *
 500          * Will use the revisions actual content model if the page exists,
 501          * and the page's default if the page doesn't exist yet.
 502          *
 503          * @return String
 504          *
 505          * @since 1.WD
 506          */
 507         public function getContentModel() {
 508                 if ( $this->exists() ) {
 509                         # look at the revision's actual content model
 510                         $rev = $this->getRevision();
 511
 512                         if ( $rev !== null ) {
 513                                 return $rev->getContentModel();
 514                         } else {
 515                                 wfWarn( "Page exists but has no revision!" );
 516                         }
 517                 }
 518
 519                 # use the default model for this page
 520                 return $this->mTitle->getContentModel();
 521         }
 522
 523         /**
 524          * Loads page_touched and returns a value indicating if it should be used
 525          * @return boolean true if not a redirect
 526          */
 527         public function checkTouched() {
 528                 if ( !$this->mDataLoaded ) {
 529                         $this->loadPageData();
 530                 }
 531                 return !$this->mIsRedirect;
 532         }
 533
 534         /**
 535          * Get the page_touched field
 536          * @return string containing GMT timestamp
 537          */
 538         public function getTouched() {
 539                 if ( !$this->mDataLoaded ) {
 540                         $this->loadPageData();
 541                 }
 542                 return $this->mTouched;
 543         }
 544
 545         /**
 546          * Get the page_latest field
 547          * @return integer rev_id of current revision
 548          */
 549         public function getLatest() {
 550                 if ( !$this->mDataLoaded ) {
 551                         $this->loadPageData();
 552                 }
 553                 return (int)$this->mLatest;
 554         }
 555
 556         /**
 557          * Get the Revision object of the oldest revision
 558          * @return Revision|null
 559          */
 560         public function getOldestRevision() {
 561                 wfProfileIn( __METHOD__ );
 562
 563                 // Try using the slave database first, then try the master
 564                 $continue = 2;
 565                 $db = wfGetDB( DB_SLAVE );
 566                 $revSelectFields = Revision::selectFields();
 567
 568                 while ( $continue ) {
 569                         $row = $db->selectRow(
 570                                 array( 'page', 'revision' ),
 571                                 $revSelectFields,
 572                                 array(
 573                                         'page_namespace' => $this->mTitle->getNamespace(),
 574                                         'page_title' => $this->mTitle->getDBkey(),
 575                                         'rev_page = page_id'
 576                                 ),
 577                                 __METHOD__,
 578                                 array(
 579                                         'ORDER BY' => 'rev_timestamp ASC'
 580                                 )
 581                         );
 582
 583                         if ( $row ) {
 584                                 $continue = 0;
 585                         } else {
 586                                 $db = wfGetDB( DB_MASTER );
 587                                 $continue--;
 588                         }
 589                 }
 590
 591                 wfProfileOut( __METHOD__ );
 592                 return $row ? Revision::newFromRow( $row ) : null;
 593         }
 594
 595         /**
 596          * Loads everything except the text
 597          * This isn't necessary for all uses, so it's only done if needed.
 598          */
 599         protected function loadLastEdit() {
 600                 if ( $this->mLastRevision !== null ) {
 601                         return; // already loaded
 602                 }
 603
 604                 $latest = $this->getLatest();
 605                 if ( !$latest ) {
 606                         return; // page doesn't exist or is missing page_latest info
 607                 }
 608
 609                 $revision = Revision::newFromPageId( $this->getId(), $latest );
 610                 if ( $revision ) { // sanity
 611                         $this->setLastEdit( $revision );
 612                 }
 613         }
 614
 615         /**
 616          * Set the latest revision
 617          */
 618         protected function setLastEdit( Revision $revision ) {
 619                 $this->mLastRevision = $revision;
 620                 $this->mTimestamp = $revision->getTimestamp();
 621         }
 622
 623         /**
 624          * Get the latest revision
 625          * @return Revision|null
 626          */
 627         public function getRevision() {
 628                 $this->loadLastEdit();
 629                 if ( $this->mLastRevision ) {
 630                         return $this->mLastRevision;
 631                 }
 632                 return null;
 633         }
 634
 635         /**
 636          * Get the content of the current revision. No side-effects...
 637          *
 638          * @param $audience Integer: one of:
 639          *      Revision::FOR_PUBLIC       to be displayed to all users
 640          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 641          *      Revision::RAW              get the text regardless of permissions
 642          * @return Content|null The content of the current revision
 643          *
 644          * @since 1.WD
 645          */
 646         public function getContent( $audience = Revision::FOR_PUBLIC ) {
 647                 $this->loadLastEdit();
 648                 if ( $this->mLastRevision ) {
 649                         return $this->mLastRevision->getContent( $audience );
 650                 }
 651                 return null;
 652         }
 653
 654         /**
 655          * Get the text of the current revision. No side-effects...
 656          *
 657          * @param $audience Integer: one of:
 658          *      Revision::FOR_PUBLIC       to be displayed to all users
 659          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 660          *      Revision::RAW              get the text regardless of permissions
 661          * @return String|false The text of the current revision
 662          * @deprecated as of 1.WD, getContent() should be used instead.
 663          */
 664         public function getText( $audience = Revision::FOR_PUBLIC ) { #@todo: deprecated, replace usage!
 665                 wfDeprecated( __METHOD__, '1.WD' );
 666
 667                 $this->loadLastEdit();
 668                 if ( $this->mLastRevision ) {
 669                         return $this->mLastRevision->getText( $audience );
 670                 }
 671                 return false;
 672         }
 673
 674         /**
 675          * Get the text of the current revision. No side-effects...
 676          *
 677          * @return String|bool The text of the current revision. False on failure
 678          * @deprecated as of 1.WD, getContent() should be used instead.
 679          */
 680         public function getRawText() {
 681                 wfDeprecated( __METHOD__, '1.WD' );
 682
 683                 return $this->getText( Revision::RAW );
 684         }
 685
 686         /**
 687          * @return string MW timestamp of last article revision
 688          */
 689         public function getTimestamp() {
 690                 // Check if the field has been filled by WikiPage::setTimestamp()
 691                 if ( !$this->mTimestamp ) {
 692                         $this->loadLastEdit();
 693                 }
 694
 695                 return wfTimestamp( TS_MW, $this->mTimestamp );
 696         }
 697
 698         /**
 699          * Set the page timestamp (use only to avoid DB queries)
 700          * @param $ts string MW timestamp of last article revision
 701          * @return void
 702          */
 703         public function setTimestamp( $ts ) {
 704                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 705         }
 706
 707         /**
 708          * @param $audience Integer: one of:
 709          *      Revision::FOR_PUBLIC       to be displayed to all users
 710          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 711          *      Revision::RAW              get the text regardless of permissions
 712          * @return int user ID for the user that made the last article revision
 713          */
 714         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 715                 $this->loadLastEdit();
 716                 if ( $this->mLastRevision ) {
 717                         return $this->mLastRevision->getUser( $audience );
 718                 } else {
 719                         return -1;
 720                 }
 721         }
 722
 723         /**
 724          * Get the User object of the user who created the page
 725          * @param $audience Integer: one of:
 726          *      Revision::FOR_PUBLIC       to be displayed to all users
 727          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 728          *      Revision::RAW              get the text regardless of permissions
 729          * @return User|null
 730          */
 731         public function getCreator( $audience = Revision::FOR_PUBLIC ) {
 732                 $revision = $this->getOldestRevision();
 733                 if ( $revision ) {
 734                         $userName = $revision->getUserText( $audience );
 735                         return User::newFromName( $userName, false );
 736                 } else {
 737                         return null;
 738                 }
 739         }
 740
 741         /**
 742          * @param $audience Integer: one of:
 743          *      Revision::FOR_PUBLIC       to be displayed to all users
 744          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 745          *      Revision::RAW              get the text regardless of permissions
 746          * @return string username of the user that made the last article revision
 747          */
 748         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 749                 $this->loadLastEdit();
 750                 if ( $this->mLastRevision ) {
 751                         return $this->mLastRevision->getUserText( $audience );
 752                 } else {
 753                         return '';
 754                 }
 755         }
 756
 757         /**
 758          * @param $audience Integer: one of:
 759          *      Revision::FOR_PUBLIC       to be displayed to all users
 760          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 761          *      Revision::RAW              get the text regardless of permissions
 762          * @return string Comment stored for the last article revision
 763          */
 764         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 765                 $this->loadLastEdit();
 766                 if ( $this->mLastRevision ) {
 767                         return $this->mLastRevision->getComment( $audience );
 768                 } else {
 769                         return '';
 770                 }
 771         }
 772
 773         /**
 774          * Returns true if last revision was marked as "minor edit"
 775          *
 776          * @return boolean Minor edit indicator for the last article revision.
 777          */
 778         public function getMinorEdit() {
 779                 $this->loadLastEdit();
 780                 if ( $this->mLastRevision ) {
 781                         return $this->mLastRevision->isMinor();
 782                 } else {
 783                         return false;
 784                 }
 785         }
 786
 787         /**
 788          * Get the cached timestamp for the last time the page changed.
 789          * This is only used to help handle slave lag by comparing to page_touched.
 790          * @return string MW timestamp
 791          */
 792         protected function getCachedLastEditTime() {
 793                 global $wgMemc;
 794                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 795                 return $wgMemc->get( $key );
 796         }
 797
 798         /**
 799          * Set the cached timestamp for the last time the page changed.
 800          * This is only used to help handle slave lag by comparing to page_touched.
 801          * @param $timestamp string
 802          * @return void
 803          */
 804         public function setCachedLastEditTime( $timestamp ) {
 805                 global $wgMemc;
 806                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 807                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 808         }
 809
 810         /**
 811          * Determine whether a page would be suitable for being counted as an
 812          * article in the site_stats table based on the title & its content
 813          *
 814          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 815          *        if false, the current database state will be used
 816          * @return Boolean
 817          */
 818         public function isCountable( $editInfo = false ) {
 819                 global $wgArticleCountMethod;
 820
 821                 if ( !$this->mTitle->isContentPage() ) {
 822                         return false;
 823                 }
 824
 825                 if ( $editInfo ) {
 826                         $content = $editInfo->pstContent;
 827                 } else {
 828                         $content = $this->getContent();
 829                 }
 830
 831                 if ( !$content || $content->isRedirect( ) ) {
 832                         return false;
 833                 }
 834
 835                 $hasLinks = null;
 836
 837                 if ( $wgArticleCountMethod === 'link' ) {
 838                         # nasty special case to avoid re-parsing to detect links
 839
 840                         if ( $editInfo ) {
 841                                 // ParserOutput::getLinks() is a 2D array of page links, so
 842                                 // to be really correct we would need to recurse in the array
 843                                 // but the main array should only have items in it if there are
 844                                 // links.
 845                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 846                         } else {
 847                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 848                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 849                         }
 850                 }
 851
 852                 return $content->isCountable( $hasLinks );
 853         }
 854
 855         /**
 856          * If this page is a redirect, get its target
 857          *
 858          * The target will be fetched from the redirect table if possible.
 859          * If this page doesn't have an entry there, call insertRedirect()
 860          * @return Title|mixed object, or null if this page is not a redirect
 861          */
 862         public function getRedirectTarget() {
 863                 if ( !$this->mTitle->isRedirect() ) {
 864                         return null;
 865                 }
 866
 867                 if ( $this->mRedirectTarget !== null ) {
 868                         return $this->mRedirectTarget;
 869                 }
 870
 871                 # Query the redirect table
 872                 $dbr = wfGetDB( DB_SLAVE );
 873                 $row = $dbr->selectRow( 'redirect',
 874                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 875                         array( 'rd_from' => $this->getId() ),
 876                         __METHOD__
 877                 );
 878
 879                 // rd_fragment and rd_interwiki were added later, populate them if empty
 880                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 881                         return $this->mRedirectTarget = Title::makeTitle(
 882                                 $row->rd_namespace, $row->rd_title,
 883                                 $row->rd_fragment, $row->rd_interwiki );
 884                 }
 885
 886                 # This page doesn't have an entry in the redirect table
 887                 return $this->mRedirectTarget = $this->insertRedirect();
 888         }
 889
 890         /**
 891          * Insert an entry for this page into the redirect table.
 892          *
 893          * Don't call this function directly unless you know what you're doing.
 894          * @return Title object or null if not a redirect
 895          */
 896         public function insertRedirect() {
 897                 // recurse through to only get the final target
 898                 $content = $this->getContent();
 899                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 900                 if ( !$retval ) {
 901                         return null;
 902                 }
 903                 $this->insertRedirectEntry( $retval );
 904                 return $retval;
 905         }
 906
 907         /**
 908          * Insert or update the redirect table entry for this page to indicate
 909          * it redirects to $rt .
 910          * @param $rt Title redirect target
 911          */
 912         public function insertRedirectEntry( $rt ) {
 913                 $dbw = wfGetDB( DB_MASTER );
 914                 $dbw->replace( 'redirect', array( 'rd_from' ),
 915                         array(
 916                                 'rd_from'      => $this->getId(),
 917                                 'rd_namespace' => $rt->getNamespace(),
 918                                 'rd_title'     => $rt->getDBkey(),
 919                                 'rd_fragment'  => $rt->getFragment(),
 920                                 'rd_interwiki' => $rt->getInterwiki(),
 921                         ),
 922                         __METHOD__
 923                 );
 924         }
 925
 926         /**
 927          * Get the Title object or URL this page redirects to
 928          *
 929          * @return mixed false, Title of in-wiki target, or string with URL
 930          */
 931         public function followRedirect() {
 932                 return $this->getRedirectURL( $this->getRedirectTarget() );
 933         }
 934
 935         /**
 936          * Get the Title object or URL to use for a redirect. We use Title
 937          * objects for same-wiki, non-special redirects and URLs for everything
 938          * else.
 939          * @param $rt Title Redirect target
 940          * @return mixed false, Title object of local target, or string with URL
 941          */
 942         public function getRedirectURL( $rt ) {
 943                 if ( !$rt ) {
 944                         return false;
 945                 }
 946
 947                 if ( $rt->isExternal() ) {
 948                         if ( $rt->isLocal() ) {
 949                                 // Offsite wikis need an HTTP redirect.
 950                                 //
 951                                 // This can be hard to reverse and may produce loops,
 952                                 // so they may be disabled in the site configuration.
 953                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 954                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 955                         } else {
 956                                 // External pages pages without "local" bit set are not valid
 957                                 // redirect targets
 958                                 return false;
 959                         }
 960                 }
 961
 962                 if ( $rt->isSpecialPage() ) {
 963                         // Gotta handle redirects to special pages differently:
 964                         // Fill the HTTP response "Location" header and ignore
 965                         // the rest of the page we're on.
 966                         //
 967                         // Some pages are not valid targets
 968                         if ( $rt->isValidRedirectTarget() ) {
 969                                 return $rt->getFullURL();
 970                         } else {
 971                                 return false;
 972                         }
 973                 }
 974
 975                 return $rt;
 976         }
 977
 978         /**
 979          * Get a list of users who have edited this article, not including the user who made
 980          * the most recent revision, which you can get from $article->getUser() if you want it
 981          * @return UserArrayFromResult
 982          */
 983         public function getContributors() {
 984                 # @todo FIXME: This is expensive; cache this info somewhere.
 985
 986                 $dbr = wfGetDB( DB_SLAVE );
 987
 988                 if ( $dbr->implicitGroupby() ) {
 989                         $realNameField = 'user_real_name';
 990                 } else {
 991                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 992                 }
 993
 994                 $tables = array( 'revision', 'user' );
 995
 996                 $fields = array(
 997                         'rev_user as user_id',
 998                         'rev_user_text AS user_name',
 999                         $realNameField,
1000                         'MAX(rev_timestamp) AS timestamp',
1001                 );
1002
1003                 $conds = array( 'rev_page' => $this->getId() );
1004
1005                 // The user who made the top revision gets credited as "this page was last edited by
1006                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1007                 $user = $this->getUser();
1008                 if ( $user ) {
1009                         $conds[] = "rev_user != $user";
1010                 } else {
1011                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1012                 }
1013
1014                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
1015
1016                 $jconds = array(
1017                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
1018                 );
1019
1020                 $options = array(
1021                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
1022                         'ORDER BY' => 'timestamp DESC',
1023                 );
1024
1025                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1026                 return new UserArrayFromResult( $res );
1027         }
1028
1029         /**
1030          * Get the last N authors
1031          * @param $num Integer: number of revisions to get
1032          * @param $revLatest String: the latest rev_id, selected from the master (optional)
1033          * @return array Array of authors, duplicates not removed
1034          */
1035         public function getLastNAuthors( $num, $revLatest = 0 ) {
1036                 wfProfileIn( __METHOD__ );
1037                 // First try the slave
1038                 // If that doesn't have the latest revision, try the master
1039                 $continue = 2;
1040                 $db = wfGetDB( DB_SLAVE );
1041
1042                 do {
1043                         $res = $db->select( array( 'page', 'revision' ),
1044                                 array( 'rev_id', 'rev_user_text' ),
1045                                 array(
1046                                         'page_namespace' => $this->mTitle->getNamespace(),
1047                                         'page_title' => $this->mTitle->getDBkey(),
1048                                         'rev_page = page_id'
1049                                 ), __METHOD__,
1050                                 array(
1051                                         'ORDER BY' => 'rev_timestamp DESC',
1052                                         'LIMIT' => $num
1053                                 )
1054                         );
1055
1056                         if ( !$res ) {
1057                                 wfProfileOut( __METHOD__ );
1058                                 return array();
1059                         }
1060
1061                         $row = $db->fetchObject( $res );
1062
1063                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1064                                 $db = wfGetDB( DB_MASTER );
1065                                 $continue--;
1066                         } else {
1067                                 $continue = 0;
1068                         }
1069                 } while ( $continue );
1070
1071                 $authors = array( $row->rev_user_text );
1072
1073                 foreach ( $res as $row ) {
1074                         $authors[] = $row->rev_user_text;
1075                 }
1076
1077                 wfProfileOut( __METHOD__ );
1078                 return $authors;
1079         }
1080
1081         /**
1082          * Should the parser cache be used?
1083          *
1084          * @param $parserOptions ParserOptions to check
1085          * @param $oldid int
1086          * @return boolean
1087          */
1088         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1089                 global $wgEnableParserCache;
1090
1091                 return $wgEnableParserCache
1092                         && $parserOptions->getStubThreshold() == 0
1093                         && $this->mTitle->exists()
1094                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1095                         && $this->getContentHandler()->isParserCacheSupported();
1096         }
1097
1098         /**
1099          * Get a ParserOutput for the given ParserOptions and revision ID.
1100          * The parser cache will be used if possible.
1101          *
1102          * @since 1.19
1103          * @param $parserOptions ParserOptions to use for the parse operation
1104          * @param $oldid Revision ID to get the text from, passing null or 0 will
1105          *               get the current revision (default value)
1106          *
1107          * @return ParserOutput or false if the revision was not found
1108          */
1109         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1110                 wfProfileIn( __METHOD__ );
1111
1112                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1113                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1114                 if ( $parserOptions->getStubThreshold() ) {
1115                         wfIncrStats( 'pcache_miss_stub' );
1116                 }
1117
1118                 if ( $useParserCache ) {
1119                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1120                         if ( $parserOutput !== false ) {
1121                                 wfProfileOut( __METHOD__ );
1122                                 return $parserOutput;
1123                         }
1124                 }
1125
1126                 if ( $oldid === null || $oldid === 0 ) {
1127                         $oldid = $this->getLatest();
1128                 }
1129
1130                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1131                 $pool->execute();
1132
1133                 wfProfileOut( __METHOD__ );
1134
1135                 return $pool->getParserOutput();
1136         }
1137
1138         /**
1139          * Do standard deferred updates after page view
1140          * @param $user User The relevant user
1141          */
1142         public function doViewUpdates( User $user ) {
1143                 global $wgDisableCounters;
1144                 if ( wfReadOnly() ) {
1145                         return;
1146                 }
1147
1148                 # Don't update page view counters on views from bot users (bug 14044)
1149                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
1150                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1151                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1152                 }
1153
1154                 # Update newtalk / watchlist notification status
1155                 $user->clearNotification( $this->mTitle );
1156         }
1157
1158         /**
1159          * Perform the actions of a page purging
1160          * @return bool
1161          */
1162         public function doPurge() {
1163                 global $wgUseSquid;
1164
1165                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
1166                         return false;
1167                 }
1168
1169                 // Invalidate the cache
1170                 $this->mTitle->invalidateCache();
1171                 $this->clear();
1172
1173                 if ( $wgUseSquid ) {
1174                         // Commit the transaction before the purge is sent
1175                         $dbw = wfGetDB( DB_MASTER );
1176                         $dbw->commit( __METHOD__ );
1177
1178                         // Send purge
1179                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1180                         $update->doUpdate();
1181                 }
1182
1183                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1184                         //@todo: move this logic to MessageCache
1185
1186                         if ( $this->mTitle->exists() ) {
1187                                 // NOTE: use transclusion text for messages.
1188                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1189
1190                                 $content = $this->getContent();
1191                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1192
1193                                 if ( $text === null ) $text = false;
1194                         } else {
1195                                 $text = false;
1196                         }
1197
1198                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1199                 }
1200                 return true;
1201         }
1202
1203         /**
1204          * Insert a new empty page record for this article.
1205          * This *must* be followed up by creating a revision
1206          * and running $this->updateRevisionOn( ... );
1207          * or else the record will be left in a funky state.
1208          * Best if all done inside a transaction.
1209          *
1210          * @param $dbw DatabaseBase
1211          * @return int The newly created page_id key, or false if the title already existed
1212          */
1213         public function insertOn( $dbw ) {
1214                 wfProfileIn( __METHOD__ );
1215
1216                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1217                 $dbw->insert( 'page', array(
1218                         'page_id'           => $page_id,
1219                         'page_namespace'    => $this->mTitle->getNamespace(),
1220                         'page_title'        => $this->mTitle->getDBkey(),
1221                         'page_counter'      => 0,
1222                         'page_restrictions' => '',
1223                         'page_is_redirect'  => 0, # Will set this shortly...
1224                         'page_is_new'       => 1,
1225                         'page_random'       => wfRandom(),
1226                         'page_touched'      => $dbw->timestamp(),
1227                         'page_latest'       => 0, # Fill this in shortly...
1228                         'page_len'          => 0, # Fill this in shortly...
1229                 ), __METHOD__, 'IGNORE' );
1230
1231                 $affected = $dbw->affectedRows();
1232
1233                 if ( $affected ) {
1234                         $newid = $dbw->insertId();
1235                         $this->mTitle->resetArticleID( $newid );
1236                 }
1237                 wfProfileOut( __METHOD__ );
1238
1239                 return $affected ? $newid : false;
1240         }
1241
1242         /**
1243          * Update the page record to point to a newly saved revision.
1244          *
1245          * @param $dbw DatabaseBase: object
1246          * @param $revision Revision: For ID number, and text used to set
1247          *                  length and redirect status fields
1248          * @param $lastRevision Integer: if given, will not overwrite the page field
1249          *                      when different from the currently set value.
1250          *                      Giving 0 indicates the new page flag should be set
1251          *                      on.
1252          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1253          *                           removing rows in redirect table.
1254          * @return bool true on success, false on failure
1255          * @private
1256          */
1257         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1258                 global $wgContentHandlerUseDB;
1259
1260                 wfProfileIn( __METHOD__ );
1261
1262                 $content = $revision->getContent();
1263                 $len = $content->getSize();
1264                 $rt = $content->getUltimateRedirectTarget();
1265
1266                 $conditions = array( 'page_id' => $this->getId() );
1267
1268                 if ( !is_null( $lastRevision ) ) {
1269                         # An extra check against threads stepping on each other
1270                         $conditions['page_latest'] = $lastRevision;
1271                 }
1272
1273                 $now = wfTimestampNow();
1274                 $row = array( /* SET */
1275                         'page_latest'      => $revision->getId(),
1276                         'page_touched'     => $dbw->timestamp( $now ),
1277                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1278                         'page_is_redirect' => $rt !== null ? 1 : 0,
1279                         'page_len'         => $len,
1280                 );
1281
1282                 if ( $wgContentHandlerUseDB ) {
1283                         $row[ 'page_content_model' ] = $revision->getContentModel();
1284                 }
1285
1286                 $dbw->update( 'page',
1287                         $row,
1288                         $conditions,
1289                         __METHOD__ );
1290
1291                 $result = $dbw->affectedRows() != 0;
1292                 if ( $result ) {
1293                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1294                         $this->setLastEdit( $revision );
1295                         $this->setCachedLastEditTime( $now );
1296                         $this->mLatest = $revision->getId();
1297                         $this->mIsRedirect = (bool)$rt;
1298                         # Update the LinkCache.
1299                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest, $revision->getContentModel() );
1300                 }
1301
1302                 wfProfileOut( __METHOD__ );
1303                 return $result;
1304         }
1305
1306         /**
1307          * Add row to the redirect table if this is a redirect, remove otherwise.
1308          *
1309          * @param $dbw DatabaseBase
1310          * @param $redirectTitle Title object pointing to the redirect target,
1311          *                       or NULL if this is not a redirect
1312          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1313          *                           removing rows in redirect table.
1314          * @return bool true on success, false on failure
1315          * @private
1316          */
1317         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1318                 // Always update redirects (target link might have changed)
1319                 // Update/Insert if we don't know if the last revision was a redirect or not
1320                 // Delete if changing from redirect to non-redirect
1321                 $isRedirect = !is_null( $redirectTitle );
1322
1323                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1324                         return true;
1325                 }
1326
1327                 wfProfileIn( __METHOD__ );
1328                 if ( $isRedirect ) {
1329                         $this->insertRedirectEntry( $redirectTitle );
1330                 } else {
1331                         // This is not a redirect, remove row from redirect table
1332                         $where = array( 'rd_from' => $this->getId() );
1333                         $dbw->delete( 'redirect', $where, __METHOD__ );
1334                 }
1335
1336                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1337                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1338                 }
1339                 wfProfileOut( __METHOD__ );
1340
1341                 return ( $dbw->affectedRows() != 0 );
1342         }
1343
1344         /**
1345          * If the given revision is newer than the currently set page_latest,
1346          * update the page record. Otherwise, do nothing.
1347          *
1348          * @param $dbw DatabaseBase object
1349          * @param $revision Revision object
1350          * @return mixed
1351          */
1352         public function updateIfNewerOn( $dbw, $revision ) {
1353                 wfProfileIn( __METHOD__ );
1354
1355                 $row = $dbw->selectRow(
1356                         array( 'revision', 'page' ),
1357                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1358                         array(
1359                                 'page_id' => $this->getId(),
1360                                 'page_latest=rev_id' ),
1361                         __METHOD__ );
1362
1363                 if ( $row ) {
1364                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1365                                 wfProfileOut( __METHOD__ );
1366                                 return false;
1367                         }
1368                         $prev = $row->rev_id;
1369                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1370                 } else {
1371                         # No or missing previous revision; mark the page as new
1372                         $prev = 0;
1373                         $lastRevIsRedirect = null;
1374                 }
1375
1376                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1377
1378                 wfProfileOut( __METHOD__ );
1379                 return $ret;
1380         }
1381
1382     /**
1383      * Get the content that needs to be saved in order to undo all revisions
1384      * between $undo and $undoafter. Revisions must belong to the same page,
1385      * must exist and must not be deleted
1386      * @param $undo Revision
1387      * @param $undoafter Revision Must be an earlier revision than $undo
1388      * @return mixed string on success, false on failure
1389      * @since 1.WD
1390      * Before we had the Content object, this was done in getUndoText
1391      */
1392     public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1393         $handler = $undo->getContentHandler();
1394         return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1395     }
1396
1397         /**
1398          * Get the text that needs to be saved in order to undo all revisions
1399          * between $undo and $undoafter. Revisions must belong to the same page,
1400          * must exist and must not be deleted
1401          * @param $undo Revision
1402          * @param $undoafter Revision Must be an earlier revision than $undo
1403          * @return mixed string on success, false on failure
1404          * @deprecated since 1.WD: use ContentHandler::getUndoContent() instead.
1405          */
1406         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1407                 wfDeprecated( __METHOD__, '1.WD' );
1408
1409                 $this->loadLastEdit();
1410
1411                 if ( $this->mLastRevision ) {
1412                         if ( is_null( $undoafter ) ) {
1413                                 $undoafter = $undo->getPrevious();
1414                         }
1415
1416                         $handler = $this->getContentHandler();
1417                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1418
1419                         if ( !$undone ) {
1420                                 return false;
1421                         } else {
1422                                 return ContentHandler::getContentText( $undone );
1423                         }
1424                 }
1425
1426                 return false;
1427         }
1428
1429         /**
1430          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1431          * @param $text String: new text of the section
1432          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1433          * @param $edittime String: revision timestamp or null to use the current revision
1434          * @return String new complete article text, or null if error
1435          *
1436          * @deprecated since 1.WD, use replaceSectionContent() instead
1437          */
1438         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1439                 wfDeprecated( __METHOD__, '1.WD' );
1440
1441                 if ( strval( $section ) == '' ) { //NOTE: keep condition in sync with condition in replaceSectionContent!
1442                         // Whole-page edit; let the whole text through
1443                         return $text;
1444                 }
1445
1446                 if ( !$this->supportsSections() ) {
1447                         throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1448                 }
1449
1450                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() ); # could even make section title, but that's not required.
1451
1452                 $newContent = $this->replaceSectionContent( $section, $sectionContent, $sectionTitle, $edittime );
1453
1454                 return ContentHandler::getContentText( $newContent );
1455         }
1456
1457         /**
1458          * Returns true iff this page's content model supports sections.
1459          *
1460          * @return boolean whether sections are supported.
1461          *
1462          * @todo: the skin should check this and not offer section functionality if sections are not supported.
1463          * @todo: the EditPage should check this and not offer section functionality if sections are not supported.
1464          */
1465         public function supportsSections() {
1466                 return $this->getContentHandler()->supportsSections();
1467         }
1468
1469         /**
1470          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1471          * @param $content Content: new content of the section
1472          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1473          * @param $edittime String: revision timestamp or null to use the current revision
1474          *
1475          * @return Content new complete article content, or null if error
1476          *
1477          * @since 1.WD
1478          */
1479         public function replaceSectionContent( $section, Content $sectionContent, $sectionTitle = '', $edittime = null ) {
1480                 wfProfileIn( __METHOD__ );
1481
1482                 if ( strval( $section ) == '' ) {
1483                         // Whole-page edit; let the whole text through
1484                         $newContent = $sectionContent;
1485                 } else {
1486                         if ( !$this->supportsSections() ) {
1487                                 throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1488                         }
1489
1490                         // Bug 30711: always use current version when adding a new section
1491                         if ( is_null( $edittime ) || $section == 'new' ) {
1492                                 $oldContent = $this->getContent();
1493                                 if ( ! $oldContent ) {
1494                                         wfDebug( __METHOD__ . ": no page text\n" );
1495                                         wfProfileOut( __METHOD__ );
1496                                         return null;
1497                                 }
1498                         } else {
1499                                 $dbw = wfGetDB( DB_MASTER );
1500                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1501
1502                                 if ( !$rev ) {
1503                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1504                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1505                                         wfProfileOut( __METHOD__ );
1506                                         return null;
1507                                 }
1508
1509                                 $oldContent = $rev->getContent();
1510                         }
1511
1512                         $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1513                 }
1514
1515                 wfProfileOut( __METHOD__ );
1516                 return $newContent;
1517         }
1518
1519         /**
1520          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1521          * @param $flags Int
1522          * @return Int updated $flags
1523          */
1524         function checkFlags( $flags ) {
1525                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1526                         if ( $this->mTitle->getArticleID() ) {
1527                                 $flags |= EDIT_UPDATE;
1528                         } else {
1529                                 $flags |= EDIT_NEW;
1530                         }
1531                 }
1532
1533                 return $flags;
1534         }
1535
1536         /**
1537          * Change an existing article or create a new article. Updates RC and all necessary caches,
1538          * optionally via the deferred update array.
1539          *
1540          * @param $text String: new text
1541          * @param $summary String: edit summary
1542          * @param $flags Integer bitfield:
1543          *      EDIT_NEW
1544          *          Article is known or assumed to be non-existent, create a new one
1545          *      EDIT_UPDATE
1546          *          Article is known or assumed to be pre-existing, update it
1547          *      EDIT_MINOR
1548          *          Mark this edit minor, if the user is allowed to do so
1549          *      EDIT_SUPPRESS_RC
1550          *          Do not log the change in recentchanges
1551          *      EDIT_FORCE_BOT
1552          *          Mark the edit a "bot" edit regardless of user rights
1553          *      EDIT_DEFER_UPDATES
1554          *          Defer some of the updates until the end of index.php
1555          *      EDIT_AUTOSUMMARY
1556          *          Fill in blank summaries with generated text where possible
1557          *
1558          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1559          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1560          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1561          * edit-already-exists error will be returned. These two conditions are also possible with
1562          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1563          *
1564          * @param $baseRevId int the revision ID this edit was based off, if any
1565          * @param $user User the user doing the edit
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          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1581          *
1582          * @deprecated since 1.WD: use doEditContent() instead.
1583          */
1584         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) { #@todo: use doEditContent() instead
1585                 wfDeprecated( __METHOD__, '1.WD' );
1586
1587                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1588
1589                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1590         }
1591
1592         /**
1593          * Change an existing article or create a new article. Updates RC and all necessary caches,
1594          * optionally via the deferred update array.
1595          *
1596          * @param $content Content: new content
1597          * @param $summary String: edit summary
1598          * @param $flags Integer bitfield:
1599          *      EDIT_NEW
1600          *          Article is known or assumed to be non-existent, create a new one
1601          *      EDIT_UPDATE
1602          *          Article is known or assumed to be pre-existing, update it
1603          *      EDIT_MINOR
1604          *          Mark this edit minor, if the user is allowed to do so
1605          *      EDIT_SUPPRESS_RC
1606          *          Do not log the change in recentchanges
1607          *      EDIT_FORCE_BOT
1608          *          Mark the edit a "bot" edit regardless of user rights
1609          *      EDIT_DEFER_UPDATES
1610          *          Defer some of the updates until the end of index.php
1611          *      EDIT_AUTOSUMMARY
1612          *          Fill in blank summaries with generated text where possible
1613          *
1614          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1615          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1616          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1617          * edit-already-exists error will be returned. These two conditions are also possible with
1618          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1619          *
1620          * @param $baseRevId the revision ID this edit was based off, if any
1621          * @param $user User the user doing the edit
1622          * @param $serialisation_format String: format for storing the content in the database
1623          *
1624          * @return Status object. Possible errors:
1625          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1626          *     edit-gone-missing:       In update mode, but the article didn't exist
1627          *     edit-conflict:           In update mode, the article changed unexpectedly
1628          *     edit-no-change:          Warning that the text was the same as before
1629          *     edit-already-exists:     In creation mode, but the article already exists
1630          *
1631          *  Extensions may define additional errors.
1632          *
1633          *  $return->value will contain an associative array with members as follows:
1634          *     new:                     Boolean indicating if the function attempted to create a new article
1635          *     revision:                The revision object for the inserted revision, or null
1636          *
1637          * @since 1.WD
1638          */
1639         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1640                                                                    User $user = null, $serialisation_format = null ) {
1641                 global $wgUser, $wgDBtransactions, $wgUseAutomaticEditSummaries;
1642
1643                 # Low-level sanity check
1644                 if ( $this->mTitle->getText() === '' ) {
1645                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1646                 }
1647
1648                 wfProfileIn( __METHOD__ );
1649
1650                 $user = is_null( $user ) ? $wgUser : $user;
1651                 $status = Status::newGood( array() );
1652
1653                 // Load the data from the master database if needed.
1654                 // The caller may already loaded it from the master or even loaded it using
1655                 // SELECT FOR UPDATE, so do not override that using clear().
1656                 $this->loadPageData( 'fromdbmaster' );
1657
1658                 $flags = $this->checkFlags( $flags );
1659
1660                 # call legacy hook
1661                 $hook_ok = wfRunHooks( 'ArticleContentSave', array( &$this, &$user, &$content, &$summary,
1662                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) );
1663
1664                 if ( $hook_ok && Hooks::isRegistered( 'ArticleSave' ) ) { # avoid serialization overhead if the hook isn't present
1665                         $content_text = $content->serialize();
1666                         $txt = $content_text; # clone
1667
1668                         $hook_ok = wfRunHooks( 'ArticleSave', array( &$this, &$user, &$txt, &$summary,
1669                                 $flags & EDIT_MINOR, null, null, &$flags, &$status ) ); #TODO: survey extensions using this hook
1670
1671                         if ( $txt !== $content_text ) {
1672                                 # if the text changed, unserialize the new version to create an updated Content object.
1673                                 $content = $content->getContentHandler()->unserializeContent( $txt );
1674                         }
1675                 }
1676
1677                 if ( !$hook_ok ) {
1678                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1679
1680                         if ( $status->isOK() ) {
1681                                 $status->fatal( 'edit-hook-aborted' );
1682                         }
1683
1684                         wfProfileOut( __METHOD__ );
1685                         return $status;
1686                 }
1687
1688                 # Silently ignore EDIT_MINOR if not allowed
1689                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1690                 $bot = $flags & EDIT_FORCE_BOT;
1691
1692                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1693
1694                 $oldsize = $old_content ? $old_content->getSize() : 0;
1695                 $oldid = $this->getLatest();
1696                 $oldIsRedirect = $this->isRedirect();
1697                 $oldcountable = $this->isCountable();
1698
1699                 $handler = $content->getContentHandler();
1700
1701                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1702                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1703                         if ( !$old_content ) $old_content = null;
1704                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1705                 }
1706
1707                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1708                 $serialized = $editInfo->pst;
1709                 $content = $editInfo->pstContent;
1710                 $newsize =  $content->getSize();
1711
1712                 $dbw = wfGetDB( DB_MASTER );
1713                 $now = wfTimestampNow();
1714                 $this->mTimestamp = $now;
1715
1716                 if ( $flags & EDIT_UPDATE ) {
1717                         # Update article, but only if changed.
1718                         $status->value['new'] = false;
1719
1720                         if ( !$oldid ) {
1721                                 # Article gone missing
1722                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1723                                 $status->fatal( 'edit-gone-missing' );
1724
1725                                 wfProfileOut( __METHOD__ );
1726                                 return $status;
1727                         }
1728
1729                         $revision = new Revision( array(
1730                                 'page'       => $this->getId(),
1731                                 'comment'    => $summary,
1732                                 'minor_edit' => $isminor,
1733                                 'text'       => $serialized,
1734                                 'len'        => $newsize,
1735                                 'parent_id'  => $oldid,
1736                                 'user'       => $user->getId(),
1737                                 'user_text'  => $user->getName(),
1738                                 'timestamp'  => $now,
1739                                 'content_model' => $content->getModel(),
1740                                 'content_format' => $serialisation_format,
1741                         ) ); #XXX: pass content object?!
1742
1743                         $changed = !$content->equals( $old_content );
1744
1745                         if ( $changed ) {
1746                                 if ( !$content->isValid() ) {
1747                                         throw new MWException( "New content failed validity check!" );
1748                                 }
1749
1750                                 $dbw->begin( __METHOD__ );
1751
1752                                 $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1753                                 $status->merge( $prepStatus );
1754
1755                                 if ( !$status->isOK() ) {
1756                                         $dbw->rollback();
1757
1758                                         wfProfileOut( __METHOD__ );
1759                                         return $status;
1760                                 }
1761
1762                                 $revisionId = $revision->insertOn( $dbw );
1763
1764                                 # Update page
1765                                 #
1766                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1767                                 # during the course of this function. This makes sure that EditPage can detect
1768                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1769                                 # before this function is called. A previous function used a separate query, this
1770                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1771                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1772
1773                                 if ( !$ok ) {
1774                                         /* Belated edit conflict! Run away!! */
1775                                         $status->fatal( 'edit-conflict' );
1776
1777                                         $revisionId = 0;
1778                                         $dbw->rollback( __METHOD__ );
1779                                 } else {
1780                                         global $wgUseRCPatrol;
1781                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1782                                         # Update recentchanges
1783                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1784                                                 # Mark as patrolled if the user can do so
1785                                                 $patrolled = $wgUseRCPatrol && !count(
1786                                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1787                                                 # Add RC row to the DB
1788                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1789                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1790                                                         $revisionId, $patrolled
1791                                                 );
1792
1793                                                 # Log auto-patrolled edits
1794                                                 if ( $patrolled ) {
1795                                                         PatrolLog::record( $rc, true, $user );
1796                                                 }
1797                                         }
1798                                         $user->incEditCount();
1799                                         $dbw->commit( __METHOD__ );
1800                                 }
1801                         } else {
1802                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1803                                 // related variables correctly
1804                                 $revision->setId( $this->getLatest() );
1805                         }
1806
1807                         // Now that ignore_user_abort is restored, we can respond to fatal errors
1808                         if ( !$status->isOK() ) {
1809                                 wfProfileOut( __METHOD__ );
1810                                 return $status;
1811                         }
1812
1813                         # Update links tables, site stats, etc.
1814                         $this->doEditUpdates(
1815                                 $revision,
1816                                 $user,
1817                                 array(
1818                                         'changed' => $changed,
1819                                         'oldcountable' => $oldcountable
1820                                 )
1821                         );
1822
1823                         if ( !$changed ) {
1824                                 $status->warning( 'edit-no-change' );
1825                                 $revision = null;
1826                                 // Update page_touched, this is usually implicit in the page update
1827                                 // Other cache updates are done in onArticleEdit()
1828                                 $this->mTitle->invalidateCache();
1829                         }
1830                 } else {
1831                         # Create new article
1832                         $status->value['new'] = true;
1833
1834                         $dbw->begin( __METHOD__ );
1835
1836                         $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1837                         $status->merge( $prepStatus );
1838
1839                         if ( !$status->isOK() ) {
1840                                 $dbw->rollback();
1841
1842                                 wfProfileOut( __METHOD__ );
1843                                 return $status;
1844                         }
1845
1846                         $status->merge( $prepStatus );
1847
1848                         # Add the page record; stake our claim on this title!
1849                         # This will return false if the article already exists
1850                         $newid = $this->insertOn( $dbw );
1851
1852                         if ( $newid === false ) {
1853                                 $dbw->rollback( __METHOD__ );
1854                                 $status->fatal( 'edit-already-exists' );
1855
1856                                 wfProfileOut( __METHOD__ );
1857                                 return $status;
1858                         }
1859
1860                         # Save the revision text...
1861                         $revision = new Revision( array(
1862                                 'page'       => $newid,
1863                                 'comment'    => $summary,
1864                                 'minor_edit' => $isminor,
1865                                 'text'       => $serialized,
1866                                 'len'        => $newsize,
1867                                 'user'       => $user->getId(),
1868                                 'user_text'  => $user->getName(),
1869                                 'timestamp'  => $now,
1870                                 'content_model' => $content->getModel(),
1871                                 'content_format' => $serialisation_format,
1872                         ) );
1873                         $revisionId = $revision->insertOn( $dbw );
1874
1875                         # Update the page record with revision data
1876                         $this->updateRevisionOn( $dbw, $revision, 0 );
1877
1878                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1879
1880                         # Update recentchanges
1881                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1882                                 global $wgUseRCPatrol, $wgUseNPPatrol;
1883
1884                                 # Mark as patrolled if the user can do so
1885                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1886                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1887                                 # Add RC row to the DB
1888                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1889                                         '', $content->getSize(), $revisionId, $patrolled );
1890
1891                                 # Log auto-patrolled edits
1892                                 if ( $patrolled ) {
1893                                         PatrolLog::record( $rc, true, $user );
1894                                 }
1895                         }
1896                         $user->incEditCount();
1897                         $dbw->commit( __METHOD__ );
1898
1899                         # Update links, etc.
1900                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1901
1902                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $serialized, $summary,
1903                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1904
1905                         wfRunHooks( 'ArticleContentInsertComplete', array( &$this, &$user, $content, $summary,
1906                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1907                 }
1908
1909                 # Do updates right now unless deferral was requested
1910                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1911                         DeferredUpdates::doUpdates();
1912                 }
1913
1914                 // Return the new revision (or null) to the caller
1915                 $status->value['revision'] = $revision;
1916
1917                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $serialized, $summary,
1918                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1919
1920                 wfRunHooks( 'ArticleContentSaveComplete', array( &$this, &$user, $content, $summary,
1921                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1922
1923                 # Promote user to any groups they meet the criteria for
1924                 $user->addAutopromoteOnceGroups( 'onEdit' );
1925
1926                 wfProfileOut( __METHOD__ );
1927                 return $status;
1928         }
1929
1930         /**
1931          * Get parser options suitable for rendering the primary article wikitext
1932          * @param User|string $user User object or 'canonical'
1933          * @return ParserOptions
1934          */
1935         public function makeParserOptions( $user ) {
1936                 global $wgContLang;
1937                 if ( $user instanceof User ) { // settings per user (even anons)
1938                         $options = ParserOptions::newFromUser( $user );
1939                 } else { // canonical settings
1940                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
1941                 }
1942                 $options->enableLimitReport(); // show inclusion/loop reports
1943                 $options->setTidy( true ); // fix bad HTML
1944                 return $options;
1945         }
1946
1947         /**
1948          * Prepare text which is about to be saved.
1949          * Returns a stdclass with source, pst and output members
1950          *
1951          * @deprecated in 1.WD: use prepareContentForEdit instead.
1952          */
1953         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1954                 wfDeprecated( __METHOD__, '1.WD' );
1955                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1956                 return $this->prepareContentForEdit( $content, $revid , $user );
1957         }
1958
1959         /**
1960          * Prepare content which is about to be saved.
1961          * Returns a stdclass with source, pst and output members
1962          *
1963          * @param \Content $content
1964          * @param null $revid
1965          * @param null|\User $user
1966          * @param null $serialization_format
1967          *
1968          * @return bool|object
1969          *
1970          * @since 1.WD
1971          */
1972         public function prepareContentForEdit( Content $content, $revid = null, User $user = null, $serialization_format = null ) {
1973                 global $wgParser, $wgContLang, $wgUser;
1974                 $user = is_null( $user ) ? $wgUser : $user;
1975                 // @TODO fixme: check $user->getId() here???
1976
1977                 if ( $this->mPreparedEdit
1978                         && $this->mPreparedEdit->newContent
1979                         && $this->mPreparedEdit->newContent->equals( $content )
1980                         && $this->mPreparedEdit->revid == $revid
1981                         && $this->mPreparedEdit->format == $serialization_format
1982                         #XXX: also check $user here?
1983                 ) {
1984                         // Already prepared
1985                         return $this->mPreparedEdit;
1986                 }
1987
1988                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1989                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1990
1991                 $edit = (object)array();
1992                 $edit->revid = $revid;
1993
1994                 $edit->pstContent = $content->preSaveTransform( $this->mTitle, $user, $popts );
1995                 $edit->pst = $edit->pstContent->serialize( $serialization_format ); #XXX: do we need this??
1996                 $edit->format = $serialization_format;
1997
1998                 $edit->popts = $this->makeParserOptions( 'canonical' );
1999
2000                 $edit->output = $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts );
2001
2002                 $edit->newContent = $content;
2003                 $edit->oldContent = $this->getContent( Revision::RAW );
2004
2005                 #NOTE: B/C for hooks! don't use these fields!
2006                 $edit->newText = ContentHandler::getContentText( $edit->newContent );
2007                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
2008
2009                 $this->mPreparedEdit = $edit;
2010
2011                 return $edit;
2012         }
2013
2014         /**
2015          * Do standard deferred updates after page edit.
2016          * Update links tables, site stats, search index and message cache.
2017          * Purges pages that include this page if the text was changed here.
2018          * Every 100th edit, prune the recent changes table.
2019          *
2020          * @param $revision Revision object
2021          * @param $user User object that did the revision
2022          * @param $options Array of options, following indexes are used:
2023          * - changed: boolean, whether the revision changed the content (default true)
2024          * - created: boolean, whether the revision created the page (default false)
2025          * - oldcountable: boolean or null (default null):
2026          *   - boolean: whether the page was counted as an article before that
2027          *     revision, only used in changed is true and created is false
2028          *   - null: don't change the article count
2029          */
2030         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2031                 global $wgEnableParserCache;
2032
2033                 wfProfileIn( __METHOD__ );
2034
2035                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2036                 $content = $revision->getContent();
2037
2038                 # Parse the text
2039                 # Be careful not to double-PST: $text is usually already PST-ed once
2040                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2041                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2042                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
2043                 } else {
2044                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2045                         $editInfo = $this->mPreparedEdit;
2046                 }
2047
2048                 # Save it to the parser cache
2049                 if ( $wgEnableParserCache ) {
2050                         $parserCache = ParserCache::singleton();
2051                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2052                 }
2053
2054                 # Update the links tables and other secondary data
2055                 $contentHandler = $revision->getContentHandler();
2056                 $updates = $contentHandler->getSecondaryDataUpdates( $content, $this->getTitle(), null, true, $editInfo->output );
2057                 DataUpdate::runUpdates( $updates );
2058
2059                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2060
2061                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2062                         if ( 0 == mt_rand( 0, 99 ) ) {
2063                                 // Flush old entries from the `recentchanges` table; we do this on
2064                                 // random requests so as to avoid an increase in writes for no good reason
2065                                 global $wgRCMaxAge;
2066
2067                                 $dbw = wfGetDB( DB_MASTER );
2068                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2069                                 $dbw->delete(
2070                                         'recentchanges',
2071                                         array( "rc_timestamp < '$cutoff'" ),
2072                                         __METHOD__
2073                                 );
2074                         }
2075                 }
2076
2077                 if ( !$this->mTitle->exists() ) {
2078                         wfProfileOut( __METHOD__ );
2079                         return;
2080                 }
2081
2082                 $id = $this->getId();
2083                 $title = $this->mTitle->getPrefixedDBkey();
2084                 $shortTitle = $this->mTitle->getDBkey();
2085
2086                 if ( !$options['changed'] ) {
2087                         $good = 0;
2088                         $total = 0;
2089                 } elseif ( $options['created'] ) {
2090                         $good = (int)$this->isCountable( $editInfo );
2091                         $total = 1;
2092                 } elseif ( $options['oldcountable'] !== null ) {
2093                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2094                         $total = 0;
2095                 } else {
2096                         $good = 0;
2097                         $total = 0;
2098                 }
2099
2100                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2101                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content->getTextForSearchIndex() ) ); #TODO: let the search engine decide what to do with the content object
2102
2103                 # If this is another user's talk page, update newtalk.
2104                 # Don't do this if $options['changed'] = false (null-edits) nor if
2105                 # it's a minor edit and the user doesn't want notifications for those.
2106                 if ( $options['changed']
2107                         && $this->mTitle->getNamespace() == NS_USER_TALK
2108                         && $shortTitle != $user->getTitleKey()
2109                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2110                 ) {
2111                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2112                                 $other = User::newFromName( $shortTitle, false );
2113                                 if ( !$other ) {
2114                                         wfDebug( __METHOD__ . ": invalid username\n" );
2115                                 } elseif ( User::isIP( $shortTitle ) ) {
2116                                         // An anonymous user
2117                                         $other->setNewtalk( true );
2118                                 } elseif ( $other->isLoggedIn() ) {
2119                                         $other->setNewtalk( true );
2120                                 } else {
2121                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2122                                 }
2123                         }
2124                 }
2125
2126                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2127                         $msgtext = $content->getWikitextForTransclusion(); #XXX: could skip pseudo-messages like js/css here, based on content model.
2128                         if ( $msgtext === false || $msgtext === null ) $msgtext = '';
2129
2130                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2131                 }
2132
2133                 if( $options['created'] ) {
2134                         self::onArticleCreate( $this->mTitle );
2135                 } else {
2136                         self::onArticleEdit( $this->mTitle );
2137                 }
2138
2139                 wfProfileOut( __METHOD__ );
2140         }
2141
2142         /**
2143          * Edit an article without doing all that other stuff
2144          * The article must already exist; link tables etc
2145          * are not updated, caches are not flushed.
2146          *
2147          * @param $text String: text submitted
2148          * @param $user User The relevant user
2149          * @param $comment String: comment submitted
2150          * @param $minor Boolean: whereas it's a minor modification
2151          *
2152          * @deprecated since 1.WD, use doEditContent() instead.
2153          */
2154         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2155                 wfDeprecated( __METHOD__, "1.WD" );
2156
2157                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2158                 return $this->doQuickEditContent( $content, $user, $comment , $minor );
2159         }
2160
2161         /**
2162          * Edit an article without doing all that other stuff
2163          * The article must already exist; link tables etc
2164          * are not updated, caches are not flushed.
2165          *
2166          * @param $content Content: content submitted
2167          * @param $user User The relevant user
2168          * @param $comment String: comment submitted
2169          * @param $serialisation_format String: format for storing the content in the database
2170          * @param $minor Boolean: whereas it's a minor modification
2171          */
2172         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = 0, $serialisation_format = null ) {
2173                 wfProfileIn( __METHOD__ );
2174
2175                 $serialized = $content->serialize( $serialisation_format );
2176
2177                 $dbw = wfGetDB( DB_MASTER );
2178                 $revision = new Revision( array(
2179                         'page'       => $this->getId(),
2180                         'text'       => $serialized,
2181                         'length'     => $content->getSize(),
2182                         'comment'    => $comment,
2183                         'minor_edit' => $minor ? 1 : 0,
2184                 ) ); #XXX: set the content object?
2185                 $revision->insertOn( $dbw );
2186                 $this->updateRevisionOn( $dbw, $revision );
2187
2188                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2189
2190                 wfProfileOut( __METHOD__ );
2191         }
2192
2193         /**
2194          * Update the article's restriction field, and leave a log entry.
2195          * This works for protection both existing and non-existing pages.
2196          *
2197          * @param $limit Array: set of restriction keys
2198          * @param $reason String
2199          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2200          * @param $expiry Array: per restriction type expiration
2201          * @param $user User The user updating the restrictions
2202          * @return Status
2203          */
2204         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
2205                 global $wgContLang;
2206
2207                 if ( wfReadOnly() ) {
2208                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2209                 }
2210
2211                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2212
2213                 $id = $this->mTitle->getArticleID();
2214
2215                 if ( !$cascade ) {
2216                         $cascade = false;
2217                 }
2218
2219                 // Take this opportunity to purge out expired restrictions
2220                 Title::purgeExpiredRestrictions();
2221
2222                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2223                 # we expect a single selection, but the schema allows otherwise.
2224                 $isProtected = false;
2225                 $protect = false;
2226                 $changed = false;
2227
2228                 $dbw = wfGetDB( DB_MASTER );
2229
2230                 foreach ( $restrictionTypes as $action ) {
2231                         if ( !isset( $expiry[$action] ) ) {
2232                                 $expiry[$action] = $dbw->getInfinity();
2233                         }
2234                         if ( !isset( $limit[$action] ) ) {
2235                                 $limit[$action] = '';
2236                         } elseif ( $limit[$action] != '' ) {
2237                                 $protect = true;
2238                         }
2239
2240                         # Get current restrictions on $action
2241                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2242                         if ( $current != '' ) {
2243                                 $isProtected = true;
2244                         }
2245
2246                         if ( $limit[$action] != $current ) {
2247                                 $changed = true;
2248                         } elseif ( $limit[$action] != '' ) {
2249                                 # Only check expiry change if the action is actually being
2250                                 # protected, since expiry does nothing on an not-protected
2251                                 # action.
2252                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2253                                         $changed = true;
2254                                 }
2255                         }
2256                 }
2257
2258                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2259                         $changed = true;
2260                 }
2261
2262                 # If nothing's changed, do nothing
2263                 if ( !$changed ) {
2264                         return Status::newGood();
2265                 }
2266
2267                 if ( !$protect ) { # No protection at all means unprotection
2268                         $revCommentMsg = 'unprotectedarticle';
2269                         $logAction = 'unprotect';
2270                 } elseif ( $isProtected ) {
2271                         $revCommentMsg = 'modifiedarticleprotection';
2272                         $logAction = 'modify';
2273                 } else {
2274                         $revCommentMsg = 'protectedarticle';
2275                         $logAction = 'protect';
2276                 }
2277
2278                 $encodedExpiry = array();
2279                 $protectDescription = '';
2280                 foreach ( $limit as $action => $restrictions ) {
2281                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
2282                         if ( $restrictions != '' ) {
2283                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
2284                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2285                                         $protectDescription .= wfMsgForContent( 'protect-expiring',
2286                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2287                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2288                                                 $wgContLang->time( $expiry[$action], false, false ) );
2289                                 } else {
2290                                         $protectDescription .= wfMsgForContent( 'protect-expiry-indefinite' );
2291                                 }
2292
2293                                 $protectDescription .= ') ';
2294                         }
2295                 }
2296                 $protectDescription = trim( $protectDescription );
2297
2298                 if ( $id ) { # Protection of existing page
2299                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2300                                 return Status::newGood();
2301                         }
2302
2303                         # Only restrictions with the 'protect' right can cascade...
2304                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2305                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2306
2307                         # The schema allows multiple restrictions
2308                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2309                                 $cascade = false;
2310                         }
2311
2312                         # Update restrictions table
2313                         foreach ( $limit as $action => $restrictions ) {
2314                                 if ( $restrictions != '' ) {
2315                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2316                                                 array( 'pr_page' => $id,
2317                                                         'pr_type' => $action,
2318                                                         'pr_level' => $restrictions,
2319                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2320                                                         'pr_expiry' => $encodedExpiry[$action]
2321                                                 ),
2322                                                 __METHOD__
2323                                         );
2324                                 } else {
2325                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2326                                                 'pr_type' => $action ), __METHOD__ );
2327                                 }
2328                         }
2329
2330                         # Prepare a null revision to be added to the history
2331                         $editComment = $wgContLang->ucfirst( wfMsgForContent( $revCommentMsg, $this->mTitle->getPrefixedText() ) );
2332                         if ( $reason ) {
2333                                 $editComment .= ": $reason";
2334                         }
2335                         if ( $protectDescription ) {
2336                                 $editComment .= " ($protectDescription)";
2337                         }
2338                         if ( $cascade ) {
2339                                 $editComment .= ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2340                         }
2341
2342                         # Insert a null revision
2343                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2344                         $nullRevId = $nullRevision->insertOn( $dbw );
2345
2346                         $latest = $this->getLatest();
2347                         # Update page record
2348                         $dbw->update( 'page',
2349                                 array( /* SET */
2350                                         'page_touched' => $dbw->timestamp(),
2351                                         'page_restrictions' => '',
2352                                         'page_latest' => $nullRevId
2353                                 ), array( /* WHERE */
2354                                         'page_id' => $id
2355                                 ), __METHOD__
2356                         );
2357
2358                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2359                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2360                 } else { # Protection of non-existing page (also known as "title protection")
2361                         # Cascade protection is meaningless in this case
2362                         $cascade = false;
2363
2364                         if ( $limit['create'] != '' ) {
2365                                 $dbw->replace( 'protected_titles',
2366                                         array( array( 'pt_namespace', 'pt_title' ) ),
2367                                         array(
2368                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2369                                                 'pt_title' => $this->mTitle->getDBkey(),
2370                                                 'pt_create_perm' => $limit['create'],
2371                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
2372                                                 'pt_expiry' => $encodedExpiry['create'],
2373                                                 'pt_user' => $user->getId(),
2374                                                 'pt_reason' => $reason,
2375                                         ), __METHOD__
2376                                 );
2377                         } else {
2378                                 $dbw->delete( 'protected_titles',
2379                                         array(
2380                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2381                                                 'pt_title' => $this->mTitle->getDBkey()
2382                                         ), __METHOD__
2383                                 );
2384                         }
2385                 }
2386
2387                 $this->mTitle->flushRestrictions();
2388
2389                 if ( $logAction == 'unprotect' ) {
2390                         $logParams = array();
2391                 } else {
2392                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
2393                 }
2394
2395                 # Update the protection log
2396                 $log = new LogPage( 'protect' );
2397                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
2398
2399                 return Status::newGood();
2400         }
2401
2402         /**
2403          * Take an array of page restrictions and flatten it to a string
2404          * suitable for insertion into the page_restrictions field.
2405          * @param $limit Array
2406          * @return String
2407          */
2408         protected static function flattenRestrictions( $limit ) {
2409                 if ( !is_array( $limit ) ) {
2410                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2411                 }
2412
2413                 $bits = array();
2414                 ksort( $limit );
2415
2416                 foreach ( $limit as $action => $restrictions ) {
2417                         if ( $restrictions != '' ) {
2418                                 $bits[] = "$action=$restrictions";
2419                         }
2420                 }
2421
2422                 return implode( ':', $bits );
2423         }
2424
2425         /**
2426          * Same as doDeleteArticleReal(), but returns more detailed success/failure status
2427          * Deletes the article with database consistency, writes logs, purges caches
2428          *
2429          * @param $reason string delete reason for deletion log
2430          * @param $suppress int bitfield
2431          *      Revision::DELETED_TEXT
2432          *      Revision::DELETED_COMMENT
2433          *      Revision::DELETED_USER
2434          *      Revision::DELETED_RESTRICTED
2435          * @param $id int article ID
2436          * @param $commit boolean defaults to true, triggers transaction end
2437          * @param &$error Array of errors to append to
2438          * @param $user User The deleting user
2439          * @return boolean true if successful
2440          */
2441         public function doDeleteArticle(
2442                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2443         ) {
2444                 return $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user )
2445                         == WikiPage::DELETE_SUCCESS;
2446         }
2447
2448         /**
2449          * Back-end article deletion
2450          * Deletes the article with database consistency, writes logs, purges caches
2451          *
2452          * @param $reason string delete reason for deletion log
2453          * @param $suppress int bitfield
2454          *      Revision::DELETED_TEXT
2455          *      Revision::DELETED_COMMENT
2456          *      Revision::DELETED_USER
2457          *      Revision::DELETED_RESTRICTED
2458          * @param $id int article ID
2459          * @param $commit boolean defaults to true, triggers transaction end
2460          * @param &$error Array of errors to append to
2461          * @param $user User The deleting user
2462          * @return int: One of WikiPage::DELETE_* constants
2463          */
2464         public function doDeleteArticleReal(
2465                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2466         ) {
2467                 global $wgUser, $wgContentHandlerUseDB;
2468
2469                 wfDebug( __METHOD__ . "\n" );
2470
2471                 if ( $this->mTitle->getDBkey() === '' ) {
2472                         return WikiPage::DELETE_NO_PAGE;
2473                 }
2474
2475                 $user = is_null( $user ) ? $wgUser : $user;
2476                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error ) ) ) {
2477                         return WikiPage::DELETE_HOOK_ABORTED;
2478                 }
2479
2480                 if ( $id == 0 ) {
2481                         $this->loadPageData( 'forupdate' );
2482                         $id = $this->getID();
2483                         if ( $id == 0 ) {
2484                                 return WikiPage::DELETE_NO_PAGE;
2485                         }
2486                 }
2487
2488                 // Bitfields to further suppress the content
2489                 if ( $suppress ) {
2490                         $bitfield = 0;
2491                         // This should be 15...
2492                         $bitfield |= Revision::DELETED_TEXT;
2493                         $bitfield |= Revision::DELETED_COMMENT;
2494                         $bitfield |= Revision::DELETED_USER;
2495                         $bitfield |= Revision::DELETED_RESTRICTED;
2496                 } else {
2497                         $bitfield = 'rev_deleted';
2498                 }
2499
2500                 // we need to remember the old content so we can use it to generate all deletion updates.
2501                 $content = $this->getContent( Revision::RAW );
2502
2503                 $dbw = wfGetDB( DB_MASTER );
2504                 $dbw->begin( __METHOD__ );
2505                 // For now, shunt the revision data into the archive table.
2506                 // Text is *not* removed from the text table; bulk storage
2507                 // is left intact to avoid breaking block-compression or
2508                 // immutable storage schemes.
2509                 //
2510                 // For backwards compatibility, note that some older archive
2511                 // table entries will have ar_text and ar_flags fields still.
2512                 //
2513                 // In the future, we may keep revisions and mark them with
2514                 // the rev_deleted field, which is reserved for this purpose.
2515
2516                 $row = array(
2517                         'ar_namespace'  => 'page_namespace',
2518                         'ar_title'      => 'page_title',
2519                         'ar_comment'    => 'rev_comment',
2520                         'ar_user'       => 'rev_user',
2521                         'ar_user_text'  => 'rev_user_text',
2522                         'ar_timestamp'  => 'rev_timestamp',
2523                         'ar_minor_edit' => 'rev_minor_edit',
2524                         'ar_rev_id'     => 'rev_id',
2525                         'ar_parent_id'  => 'rev_parent_id',
2526                         'ar_text_id'    => 'rev_text_id',
2527                         'ar_text'       => '\'\'', // Be explicit to appease
2528                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2529                         'ar_len'        => 'rev_len',
2530                         'ar_page_id'    => 'page_id',
2531                         'ar_deleted'    => $bitfield,
2532                         'ar_sha1'       => 'rev_sha1',
2533                 );
2534
2535                 if ( $wgContentHandlerUseDB ) {
2536                         $row[ 'ar_content_model' ] = 'rev_content_model';
2537                         $row[ 'ar_content_format' ] = 'rev_content_format';
2538                 }
2539
2540                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2541                         $row,
2542                         array(
2543                                 'page_id' => $id,
2544                                 'page_id = rev_page'
2545                         ), __METHOD__
2546                 );
2547
2548                 # Now that it's safely backed up, delete it
2549                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2550                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleID() uses slave, could be laggy
2551
2552                 if ( !$ok ) {
2553                         $dbw->rollback( __METHOD__ );
2554                         return WikiPage::DELETE_NO_REVISIONS;
2555                 }
2556
2557                 $this->doDeleteUpdates( $id, $content );
2558
2559                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2560                 $logtype = $suppress ? 'suppress' : 'delete';
2561
2562                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2563                 $logEntry->setPerformer( $user );
2564                 $logEntry->setTarget( $this->mTitle );
2565                 $logEntry->setComment( $reason );
2566                 $logid = $logEntry->insert();
2567                 $logEntry->publish( $logid );
2568
2569                 if ( $commit ) {
2570                         $dbw->commit( __METHOD__ );
2571                 }
2572
2573                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
2574                 return WikiPage::DELETE_SUCCESS;
2575         }
2576
2577         /**
2578          * Do some database updates after deletion
2579          *
2580          * @param $id Int: page_id value of the page being deleted (B/C, currently unused)
2581          * @param $content Content: optional page content to be used when determining the required updates.
2582          *        This may be needed because $this->getContent() may already return null when the page proper was deleted.
2583          */
2584         public function doDeleteUpdates( $id, Content $content = null ) {
2585                 # update site status
2586                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2587
2588                 # remove secondary indexes, etc
2589                 $updates = $this->getDeletionUpdates( $content );
2590                 DataUpdate::runUpdates( $updates );
2591
2592                 # Clear caches
2593                 WikiPage::onArticleDelete( $this->mTitle );
2594
2595                 # Reset this object
2596                 $this->clear();
2597
2598                 # Clear the cached article id so the interface doesn't act like we exist
2599                 $this->mTitle->resetArticleID( 0 );
2600         }
2601
2602         /**
2603          * Roll back the most recent consecutive set of edits to a page
2604          * from the same user; fails if there are no eligible edits to
2605          * roll back to, e.g. user is the sole contributor. This function
2606          * performs permissions checks on $user, then calls commitRollback()
2607          * to do the dirty work
2608          *
2609          * @todo: seperate the business/permission stuff out from backend code
2610          *
2611          * @param $fromP String: Name of the user whose edits to rollback.
2612          * @param $summary String: Custom summary. Set to default summary if empty.
2613          * @param $token String: Rollback token.
2614          * @param $bot Boolean: If true, mark all reverted edits as bot.
2615          *
2616          * @param $resultDetails Array: contains result-specific array of additional values
2617          *    'alreadyrolled' : 'current' (rev)
2618          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2619          *
2620          * @param $user User The user performing the rollback
2621          * @return array of errors, each error formatted as
2622          *   array(messagekey, param1, param2, ...).
2623          * On success, the array is empty.  This array can also be passed to
2624          * OutputPage::showPermissionsErrorPage().
2625          */
2626         public function doRollback(
2627                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2628         ) {
2629                 $resultDetails = null;
2630
2631                 # Check permissions
2632                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2633                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2634                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2635
2636                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2637                         $errors[] = array( 'sessionfailure' );
2638                 }
2639
2640                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2641                         $errors[] = array( 'actionthrottledtext' );
2642                 }
2643
2644                 # If there were errors, bail out now
2645                 if ( !empty( $errors ) ) {
2646                         return $errors;
2647                 }
2648
2649                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2650         }
2651
2652         /**
2653          * Backend implementation of doRollback(), please refer there for parameter
2654          * and return value documentation
2655          *
2656          * NOTE: This function does NOT check ANY permissions, it just commits the
2657          * rollback to the DB. Therefore, you should only call this function direct-
2658          * ly if you want to use custom permissions checks. If you don't, use
2659          * doRollback() instead.
2660          * @param $fromP String: Name of the user whose edits to rollback.
2661          * @param $summary String: Custom summary. Set to default summary if empty.
2662          * @param $bot Boolean: If true, mark all reverted edits as bot.
2663          *
2664          * @param $resultDetails Array: contains result-specific array of additional values
2665          * @param $guser User The user performing the rollback
2666          * @return array
2667          */
2668         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2669                 global $wgUseRCPatrol, $wgContLang;
2670
2671                 $dbw = wfGetDB( DB_MASTER );
2672
2673                 if ( wfReadOnly() ) {
2674                         return array( array( 'readonlytext' ) );
2675                 }
2676
2677                 # Get the last editor
2678                 $current = $this->getRevision();
2679                 if ( is_null( $current ) ) {
2680                         # Something wrong... no page?
2681                         return array( array( 'notanarticle' ) );
2682                 }
2683
2684                 $from = str_replace( '_', ' ', $fromP );
2685                 # User name given should match up with the top revision.
2686                 # If the user was deleted then $from should be empty.
2687                 if ( $from != $current->getUserText() ) {
2688                         $resultDetails = array( 'current' => $current );
2689                         return array( array( 'alreadyrolled',
2690                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2691                                 htmlspecialchars( $fromP ),
2692                                 htmlspecialchars( $current->getUserText() )
2693                         ) );
2694                 }
2695
2696                 # Get the last edit not by this guy...
2697                 # Note: these may not be public values
2698                 $user = intval( $current->getRawUser() );
2699                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2700                 $s = $dbw->selectRow( 'revision',
2701                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2702                         array( 'rev_page' => $current->getPage(),
2703                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2704                         ), __METHOD__,
2705                         array( 'USE INDEX' => 'page_timestamp',
2706                                 'ORDER BY' => 'rev_timestamp DESC' )
2707                         );
2708                 if ( $s === false ) {
2709                         # No one else ever edited this page
2710                         return array( array( 'cantrollback' ) );
2711                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2712                         # Only admins can see this text
2713                         return array( array( 'notvisiblerev' ) );
2714                 }
2715
2716                 $set = array();
2717                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2718                         # Mark all reverted edits as bot
2719                         $set['rc_bot'] = 1;
2720                 }
2721
2722                 if ( $wgUseRCPatrol ) {
2723                         # Mark all reverted edits as patrolled
2724                         $set['rc_patrolled'] = 1;
2725                 }
2726
2727                 if ( count( $set ) ) {
2728                         $dbw->update( 'recentchanges', $set,
2729                                 array( /* WHERE */
2730                                         'rc_cur_id' => $current->getPage(),
2731                                         'rc_user_text' => $current->getUserText(),
2732                                         "rc_timestamp > '{$s->rev_timestamp}'",
2733                                 ), __METHOD__
2734                         );
2735                 }
2736
2737                 # Generate the edit summary if necessary
2738                 $target = Revision::newFromId( $s->rev_id );
2739                 if ( empty( $summary ) ) {
2740                         if ( $from == '' ) { // no public user name
2741                                 $summary = wfMsgForContent( 'revertpage-nouser' );
2742                         } else {
2743                                 $summary = wfMsgForContent( 'revertpage' );
2744                         }
2745                 }
2746
2747                 # Allow the custom summary to use the same args as the default message
2748                 $args = array(
2749                         $target->getUserText(), $from, $s->rev_id,
2750                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2751                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2752                 );
2753                 $summary = wfMsgReplaceArgs( $summary, $args );
2754
2755                 # Save
2756                 $flags = EDIT_UPDATE;
2757
2758                 if ( $guser->isAllowed( 'minoredit' ) ) {
2759                         $flags |= EDIT_MINOR;
2760                 }
2761
2762                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2763                         $flags |= EDIT_FORCE_BOT;
2764                 }
2765
2766                 # Actually store the edit
2767                 $status = $this->doEditContent( $target->getContent(), $summary, $flags, $target->getId(), $guser );
2768                 if ( !empty( $status->value['revision'] ) ) {
2769                         $revId = $status->value['revision']->getId();
2770                 } else {
2771                         $revId = false;
2772                 }
2773
2774                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2775
2776                 $resultDetails = array(
2777                         'summary' => $summary,
2778                         'current' => $current,
2779                         'target'  => $target,
2780                         'newid'   => $revId
2781                 );
2782
2783                 return array();
2784         }
2785
2786         /**
2787          * The onArticle*() functions are supposed to be a kind of hooks
2788          * which should be called whenever any of the specified actions
2789          * are done.
2790          *
2791          * This is a good place to put code to clear caches, for instance.
2792          *
2793          * This is called on page move and undelete, as well as edit
2794          *
2795          * @param $title Title object
2796          */
2797         public static function onArticleCreate( $title ) {
2798                 # Update existence markers on article/talk tabs...
2799                 if ( $title->isTalkPage() ) {
2800                         $other = $title->getSubjectPage();
2801                 } else {
2802                         $other = $title->getTalkPage();
2803                 }
2804
2805                 $other->invalidateCache();
2806                 $other->purgeSquid();
2807
2808                 $title->touchLinks();
2809                 $title->purgeSquid();
2810                 $title->deleteTitleProtection();
2811         }
2812
2813         /**
2814          * Clears caches when article is deleted
2815          *
2816          * @param $title Title
2817          */
2818         public static function onArticleDelete( $title ) {
2819                 # Update existence markers on article/talk tabs...
2820                 if ( $title->isTalkPage() ) {
2821                         $other = $title->getSubjectPage();
2822                 } else {
2823                         $other = $title->getTalkPage();
2824                 }
2825
2826                 $other->invalidateCache();
2827                 $other->purgeSquid();
2828
2829                 $title->touchLinks();
2830                 $title->purgeSquid();
2831
2832                 # File cache
2833                 HTMLFileCache::clearFileCache( $title );
2834
2835                 # Messages
2836                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2837                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2838                 }
2839
2840                 # Images
2841                 if ( $title->getNamespace() == NS_FILE ) {
2842                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2843                         $update->doUpdate();
2844                 }
2845
2846                 # User talk pages
2847                 if ( $title->getNamespace() == NS_USER_TALK ) {
2848                         $user = User::newFromName( $title->getText(), false );
2849                         if ( $user ) {
2850                                 $user->setNewtalk( false );
2851                         }
2852                 }
2853
2854                 # Image redirects
2855                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2856         }
2857
2858         /**
2859          * Purge caches on page update etc
2860          *
2861          * @param $title Title object
2862          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2863          */
2864         public static function onArticleEdit( $title ) {
2865                 // Invalidate caches of articles which include this page
2866                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2867
2868
2869                 // Invalidate the caches of all pages which redirect here
2870                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2871
2872                 # Purge squid for this page only
2873                 $title->purgeSquid();
2874
2875                 # Clear file cache for this page only
2876                 HTMLFileCache::clearFileCache( $title );
2877         }
2878
2879         /**#@-*/
2880
2881         /**
2882          * Returns a list of hidden categories this page is a member of.
2883          * Uses the page_props and categorylinks tables.
2884          *
2885          * @return Array of Title objects
2886          */
2887         public function getHiddenCategories() {
2888                 $result = array();
2889                 $id = $this->mTitle->getArticleID();
2890
2891                 if ( $id == 0 ) {
2892                         return array();
2893                 }
2894
2895                 $dbr = wfGetDB( DB_SLAVE );
2896                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2897                         array( 'cl_to' ),
2898                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2899                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2900                         __METHOD__ );
2901
2902                 if ( $res !== false ) {
2903                         foreach ( $res as $row ) {
2904                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2905                         }
2906                 }
2907
2908                 return $result;
2909         }
2910
2911         /**
2912         * Return an applicable autosummary if one exists for the given edit.
2913         * @param $oldtext String|null: the previous text of the page.
2914         * @param $newtext String|null: The submitted text of the page.
2915         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2916         * @return string An appropriate autosummary, or an empty string.
2917         *
2918         * @deprecated since 1.WD, use ContentHandler::getAutosummary() instead
2919         */
2920         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2921                 # NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
2922
2923                 wfDeprecated( __METHOD__, '1.WD' );
2924
2925                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
2926                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
2927                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
2928
2929                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
2930         }
2931
2932         /**
2933          * Auto-generates a deletion reason
2934          *
2935          * @param &$hasHistory Boolean: whether the page has a history
2936          * @return mixed String containing deletion reason or empty string, or boolean false
2937          *    if no revision occurred
2938          */
2939         public function getAutoDeleteReason( &$hasHistory ) {
2940                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
2941         }
2942
2943         /**
2944          * Update all the appropriate counts in the category table, given that
2945          * we've added the categories $added and deleted the categories $deleted.
2946          *
2947          * @param $added array   The names of categories that were added
2948          * @param $deleted array The names of categories that were deleted
2949          */
2950         public function updateCategoryCounts( $added, $deleted ) {
2951                 $ns = $this->mTitle->getNamespace();
2952                 $dbw = wfGetDB( DB_MASTER );
2953
2954                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2955                 # exist, we might legitimately not create it, but it's simpler to just
2956                 # create it and then give it a negative value, since the value is bogus
2957                 # anyway.
2958                 #
2959                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2960                 $insertCats = array_merge( $added, $deleted );
2961                 if ( !$insertCats ) {
2962                         # Okay, nothing to do
2963                         return;
2964                 }
2965
2966                 $insertRows = array();
2967
2968                 foreach ( $insertCats as $cat ) {
2969                         $insertRows[] = array(
2970                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2971                                 'cat_title' => $cat
2972                         );
2973                 }
2974                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2975
2976                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2977                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2978
2979                 if ( $ns == NS_CATEGORY ) {
2980                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2981                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2982                 } elseif ( $ns == NS_FILE ) {
2983                         $addFields[]    = 'cat_files = cat_files + 1';
2984                         $removeFields[] = 'cat_files = cat_files - 1';
2985                 }
2986
2987                 if ( $added ) {
2988                         $dbw->update(
2989                                 'category',
2990                                 $addFields,
2991                                 array( 'cat_title' => $added ),
2992                                 __METHOD__
2993                         );
2994                 }
2995
2996                 if ( $deleted ) {
2997                         $dbw->update(
2998                                 'category',
2999                                 $removeFields,
3000                                 array( 'cat_title' => $deleted ),
3001                                 __METHOD__
3002                         );
3003                 }
3004         }
3005
3006         /**
3007          * Updates cascading protections
3008          *
3009          * @param $parserOutput ParserOutput object for the current version
3010          */
3011         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
3012                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
3013                         return;
3014                 }
3015
3016                 // templatelinks table may have become out of sync,
3017                 // especially if using variable-based transclusions.
3018                 // For paranoia, check if things have changed and if
3019                 // so apply updates to the database. This will ensure
3020                 // that cascaded protections apply as soon as the changes
3021                 // are visible.
3022
3023                 # Get templates from templatelinks
3024                 $id = $this->mTitle->getArticleID();
3025
3026                 $tlTemplates = array();
3027
3028                 $dbr = wfGetDB( DB_SLAVE );
3029                 $res = $dbr->select( array( 'templatelinks' ),
3030                         array( 'tl_namespace', 'tl_title' ),
3031                         array( 'tl_from' => $id ),
3032                         __METHOD__
3033                 );
3034
3035                 foreach ( $res as $row ) {
3036                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3037                 }
3038
3039                 # Get templates from parser output.
3040                 $poTemplates = array();
3041                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3042                         foreach ( $templates as $dbk => $id ) {
3043                                 $poTemplates["$ns:$dbk"] = true;
3044                         }
3045                 }
3046
3047                 # Get the diff
3048                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3049
3050                 if ( count( $templates_diff ) > 0 ) {
3051                         # Whee, link updates time.
3052                         # Note: we are only interested in links here. We don't need to get other DataUpdate items from the parser output.
3053                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3054                         $u->doUpdate();
3055                 }
3056         }
3057
3058         /**
3059          * Return a list of templates used by this article.
3060          * Uses the templatelinks table
3061          *
3062          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
3063          * @return Array of Title objects
3064          */
3065         public function getUsedTemplates() {
3066                 return $this->mTitle->getTemplateLinksFrom();
3067         }
3068
3069         /**
3070          * Perform article updates on a special page creation.
3071          *
3072          * @param $rev Revision object
3073          *
3074          * @todo This is a shitty interface function. Kill it and replace the
3075          * other shitty functions like doEditUpdates and such so it's not needed
3076          * anymore.
3077          * @deprecated since 1.18, use doEditUpdates()
3078          */
3079         public function createUpdates( $rev ) {
3080                 wfDeprecated( __METHOD__, '1.18' );
3081                 global $wgUser;
3082                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
3083         }
3084
3085         /**
3086          * This function is called right before saving the wikitext,
3087          * so we can do things like signatures and links-in-context.
3088          *
3089          * @deprecated in 1.19; use Parser::preSaveTransform() instead
3090          * @param $text String article contents
3091          * @param $user User object: user doing the edit
3092          * @param $popts ParserOptions object: parser options, default options for
3093          *               the user loaded if null given
3094          * @return string article contents with altered wikitext markup (signatures
3095          *      converted, {{subst:}}, templates, etc.)
3096          */
3097         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3098                 global $wgParser, $wgUser;
3099
3100                 wfDeprecated( __METHOD__, '1.19' );
3101
3102                 $user = is_null( $user ) ? $wgUser : $user;
3103
3104                 if ( $popts === null ) {
3105                         $popts = ParserOptions::newFromUser( $user );
3106                 }
3107
3108                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3109         }
3110
3111         /**
3112          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
3113          *
3114          * @deprecated in 1.19; use Title::isBigDeletion() instead.
3115          * @return bool
3116          */
3117         public function isBigDeletion() {
3118                 wfDeprecated( __METHOD__, '1.19' );
3119                 return $this->mTitle->isBigDeletion();
3120         }
3121
3122         /**
3123          * Get the  approximate revision count of this page.
3124          *
3125          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
3126          * @return int
3127          */
3128         public function estimateRevisionCount() {
3129                 wfDeprecated( __METHOD__, '1.19' );
3130                 return $this->mTitle->estimateRevisionCount();
3131         }
3132
3133         /**
3134          * Update the article's restriction field, and leave a log entry.
3135          *
3136          * @deprecated since 1.19
3137          * @param $limit Array: set of restriction keys
3138          * @param $reason String
3139          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
3140          * @param $expiry Array: per restriction type expiration
3141          * @param $user User The user updating the restrictions
3142          * @return bool true on success
3143          */
3144         public function updateRestrictions(
3145                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3146         ) {
3147                 global $wgUser;
3148
3149                 $user = is_null( $user ) ? $wgUser : $user;
3150
3151                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3152         }
3153
3154         /**
3155          * @deprecated since 1.18
3156          */
3157         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3158                 wfDeprecated( __METHOD__, '1.18' );
3159                 global $wgUser;
3160                 $this->doQuickEdit( $text, $wgUser, $comment, $minor );
3161         }
3162
3163         /**
3164          * @deprecated since 1.18
3165          */
3166         public function viewUpdates() {
3167                 wfDeprecated( __METHOD__, '1.18' );
3168                 global $wgUser;
3169                 return $this->doViewUpdates( $wgUser );
3170         }
3171
3172         /**
3173          * @deprecated since 1.18
3174          * @return bool
3175          */
3176         public function useParserCache( $oldid ) {
3177                 wfDeprecated( __METHOD__, '1.18' );
3178                 global $wgUser;
3179                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
3180         }
3181
3182         /**
3183          * Returns a list of updates to be performed when this page is deleted. The updates should remove any infomration
3184          * about this page from secondary data stores such as links tables.
3185          *
3186          * @param Content|null $content optional Content object for determining the necessary updates
3187          * @return Array an array of DataUpdates objects
3188          */
3189         public function getDeletionUpdates( Content $content = null ) {
3190                 if ( !$content ) {
3191                         // load content object, which may be used to determine the necessary updates
3192                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3193                         $content = $this->getContent( Revision::RAW );
3194                 }
3195
3196                 $updates = $this->getContentHandler()->getDeletionUpdates( $content, $this->mTitle );
3197
3198                 wfRunHooks( 'WikiPageDeletionUpdates', array( $this, &$updates ) );
3199                 return $updates;
3200         }
3201
3202 }
3203
3204 class PoolWorkArticleView extends PoolCounterWork {
3205
3206         /**
3207          * @var Page
3208          */
3209         private $page;
3210
3211         /**
3212          * @var string
3213          */
3214         private $cacheKey;
3215
3216         /**
3217          * @var integer
3218          */
3219         private $revid;
3220
3221         /**
3222          * @var ParserOptions
3223          */
3224         private $parserOptions;
3225
3226         /**
3227          * @var Content|null
3228          */
3229         private $content = null;
3230
3231         /**
3232          * @var ParserOutput|bool
3233          */
3234         private $parserOutput = false;
3235
3236         /**
3237          * @var bool
3238          */
3239         private $isDirty = false;
3240
3241         /**
3242          * @var Status|bool
3243          */
3244         private $error = false;
3245
3246         /**
3247          * Constructor
3248          *
3249          * @param $page Page
3250          * @param $revid Integer: ID of the revision being parsed
3251          * @param $useParserCache Boolean: whether to use the parser cache
3252          * @param $parserOptions parserOptions to use for the parse operation
3253          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
3254          */
3255         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null ) {
3256                 if ( is_string($content) ) { #BC: old style call
3257                         $modelId = $page->getRevision()->getContentModel();
3258                         $format = $page->getRevision()->getContentFormat();
3259                         $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelId, $format );
3260                 }
3261
3262                 $this->page = $page;
3263                 $this->revid = $revid;
3264                 $this->cacheable = $useParserCache;
3265                 $this->parserOptions = $parserOptions;
3266                 $this->content = $content;
3267                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3268                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3269         }
3270
3271         /**
3272          * Get the ParserOutput from this object, or false in case of failure
3273          *
3274          * @return ParserOutput
3275          */
3276         public function getParserOutput() {
3277                 return $this->parserOutput;
3278         }
3279
3280         /**
3281          * Get whether the ParserOutput is a dirty one (i.e. expired)
3282          *
3283          * @return bool
3284          */
3285         public function getIsDirty() {
3286                 return $this->isDirty;
3287         }
3288
3289         /**
3290          * Get a Status object in case of error or false otherwise
3291          *
3292          * @return Status|bool
3293          */
3294         public function getError() {
3295                 return $this->error;
3296         }
3297
3298         /**
3299          * @return bool
3300          */
3301         function doWork() {
3302                 global $wgUseFileCache;
3303
3304                 // @todo: several of the methods called on $this->page are not declared in Page, but present in WikiPage and delegated by Article.
3305
3306                 $isCurrent = $this->revid === $this->page->getLatest();
3307
3308                 if ( $this->content !== null ) {
3309                         $content = $this->content;
3310                 } elseif ( $isCurrent ) {
3311                         $content = $this->page->getContent( Revision::RAW ); #XXX: why use RAW audience here, and PUBLIC (default) below?
3312                 } else {
3313                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3314                         if ( $rev === null ) {
3315                                 return false;
3316                         }
3317                         $content = $rev->getContent(); #XXX: why use PUBLIC audience here (default), and RAW above?
3318                 }
3319
3320                 $time = - microtime( true );
3321                 $this->parserOutput = $content->getParserOutput( $this->page->getTitle(), $this->revid, $this->parserOptions );
3322                 $time += microtime( true );
3323
3324                 # Timing hack
3325                 if ( $time > 3 ) {
3326                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3327                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3328                 }
3329
3330                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
3331                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
3332                 }
3333
3334                 // Make sure file cache is not used on uncacheable content.
3335                 // Output that has magic words in it can still use the parser cache
3336                 // (if enabled), though it will generally expire sooner.
3337                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3338                         $wgUseFileCache = false;
3339                 }
3340
3341                 if ( $isCurrent ) {
3342                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3343                 }
3344
3345                 return true;
3346         }
3347
3348         /**
3349          * @return bool
3350          */
3351         function getCachedWork() {
3352                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3353
3354                 if ( $this->parserOutput === false ) {
3355                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3356                         return false;
3357                 } else {
3358                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3359                         return true;
3360                 }
3361         }
3362
3363         /**
3364          * @return bool
3365          */
3366         function fallback() {
3367                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3368
3369                 if ( $this->parserOutput === false ) {
3370                         wfDebugLog( 'dirty', "dirty missing\n" );
3371                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3372                         return false;
3373                 } else {
3374                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3375                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
3376                         $this->isDirty = true;
3377                         return true;
3378                 }
3379         }
3380
3381         /**
3382          * @param $status Status
3383          * @return bool
3384          */
3385         function error( $status ) {
3386                 $this->error = $status;
3387                 return false;
3388         }
3389 }
3390