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 implements IDBAccessObject {
  37         // Constants for $mDataLoadedFrom and related
  38
  39         /**
  40          * @var Title
  41          */
  42         public $mTitle = null;
  43
  44         /**@{{
  45          * @protected
  46          */
  47         public $mDataLoaded = false;         // !< Boolean
  48         public $mIsRedirect = false;         // !< Boolean
  49         public $mLatest = false;             // !< Integer (false means "not loaded")
  50         public $mPreparedEdit = false;       // !< Array
  51         /**@}}*/
  52
  53         /**
  54          * @var int; one of the READ_* constants
  55          */
  56         protected $mDataLoadedFrom = self::READ_NONE;
  57
  58         /**
  59          * @var Title
  60          */
  61         protected $mRedirectTarget = null;
  62
  63         /**
  64          * @var Revision
  65          */
  66         protected $mLastRevision = null;
  67
  68         /**
  69          * @var string; timestamp of the current revision or empty string if not loaded
  70          */
  71         protected $mTimestamp = '';
  72
  73         /**
  74          * @var string
  75          */
  76         protected $mTouched = '19700101000000';
  77
  78         /**
  79          * @var int|null
  80          */
  81         protected $mCounter = null;
  82
  83         /**
  84          * Constructor and clear the article
  85          * @param $title Title Reference to a Title object.
  86          */
  87         public function __construct( Title $title ) {
  88                 $this->mTitle = $title;
  89         }
  90
  91         /**
  92          * Create a WikiPage object of the appropriate class for the given title.
  93          *
  94          * @param $title Title
  95          * @return WikiPage object of the appropriate type
  96          */
  97         public static function factory( Title $title ) {
  98                 $ns = $title->getNamespace();
  99
 100                 if ( $ns == NS_MEDIA ) {
 101                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 102                 } elseif ( $ns < 0 ) {
 103                         throw new MWException( "Invalid or virtual namespace $ns given." );
 104                 }
 105
 106                 switch ( $ns ) {
 107                         case NS_FILE:
 108                                 $page = new WikiFilePage( $title );
 109                                 break;
 110                         case NS_CATEGORY:
 111                                 $page = new WikiCategoryPage( $title );
 112                                 break;
 113                         default:
 114                                 $page = new WikiPage( $title );
 115                 }
 116
 117                 return $page;
 118         }
 119
 120         /**
 121          * Constructor from a page id
 122          *
 123          * @param $id Int article ID to load
 124          * @param $from string|int one of the following values:
 125          *        - "fromdb" or WikiPage::READ_NORMAL to select from a slave database
 126          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 127          *
 128          * @return WikiPage|null
 129          */
 130         public static function newFromID( $id, $from = 'fromdb' ) {
 131                 $from = self::convertSelectType( $from );
 132                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_SLAVE );
 133                 $row = $db->selectRow( 'page', self::selectFields(), array( 'page_id' => $id ), __METHOD__ );
 134                 if ( !$row ) {
 135                         return null;
 136                 }
 137                 return self::newFromRow( $row, $from );
 138         }
 139
 140         /**
 141          * Constructor from a database row
 142          *
 143          * @since 1.20
 144          * @param $row object: database row containing at least fields returned
 145          *        by selectFields().
 146          * @param $from string|int: source of $data:
 147          *        - "fromdb" or WikiPage::READ_NORMAL: from a slave DB
 148          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 149          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 150          * @return WikiPage
 151          */
 152         public static function newFromRow( $row, $from = 'fromdb' ) {
 153                 $page = self::factory( Title::newFromRow( $row ) );
 154                 $page->loadFromRow( $row, $from );
 155                 return $page;
 156         }
 157
 158         /**
 159          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 160          *
 161          * @param $type object|string|int
 162          * @return mixed
 163          */
 164         private static function convertSelectType( $type ) {
 165                 switch ( $type ) {
 166                 case 'fromdb':
 167                         return self::READ_NORMAL;
 168                 case 'fromdbmaster':
 169                         return self::READ_LATEST;
 170                 case 'forupdate':
 171                         return self::READ_LOCKING;
 172                 default:
 173                         // It may already be an integer or whatever else
 174                         return $type;
 175                 }
 176         }
 177
 178         /**
 179          * Returns overrides for action handlers.
 180          * Classes listed here will be used instead of the default one when
 181          * (and only when) $wgActions[$action] === true. This allows subclasses
 182          * to override the default behavior.
 183          *
 184          * @todo: move this UI stuff somewhere else
 185          *
 186          * @return Array
 187          */
 188         public function getActionOverrides() {
 189                 $content_handler = $this->getContentHandler();
 190                 return $content_handler->getActionOverrides();
 191         }
 192
 193         /**
 194          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 195          *
 196          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 197          *
 198          * @return ContentHandler
 199          *
 200          * @since 1.WD
 201          */
 202         public function getContentHandler() {
 203                 return ContentHandler::getForModelID( $this->getContentModel() );
 204         }
 205
 206         /**
 207          * Get the title object of the article
 208          * @return Title object of this page
 209          */
 210         public function getTitle() {
 211                 return $this->mTitle;
 212         }
 213
 214         /**
 215          * Clear the object
 216          * @return void
 217          */
 218         public function clear() {
 219                 $this->mDataLoaded = false;
 220                 $this->mDataLoadedFrom = self::READ_NONE;
 221
 222                 $this->clearCacheFields();
 223         }
 224
 225         /**
 226          * Clear the object cache fields
 227          * @return void
 228          */
 229         protected function clearCacheFields() {
 230                 $this->mCounter = null;
 231                 $this->mRedirectTarget = null; # Title object if set
 232                 $this->mLastRevision = null; # Latest revision
 233                 $this->mTouched = '19700101000000';
 234                 $this->mTimestamp = '';
 235                 $this->mIsRedirect = false;
 236                 $this->mLatest = false;
 237                 $this->mPreparedEdit = false;
 238         }
 239
 240         /**
 241          * Return the list of revision fields that should be selected to create
 242          * a new page.
 243          *
 244          * @return array
 245          */
 246         public static function selectFields() {
 247                 global $wgContentHandlerUseDB;
 248
 249                 $fields = array(
 250                         'page_id',
 251                         'page_namespace',
 252                         'page_title',
 253                         'page_restrictions',
 254                         'page_counter',
 255                         'page_is_redirect',
 256                         'page_is_new',
 257                         'page_random',
 258                         'page_touched',
 259                         'page_latest',
 260                         'page_len',
 261                 );
 262
 263                 if ( $wgContentHandlerUseDB ) {
 264                         $fields[] = 'page_content_model';
 265                 }
 266
 267                 return $fields;
 268         }
 269
 270         /**
 271          * Fetch a page record with the given conditions
 272          * @param $dbr DatabaseBase object
 273          * @param $conditions Array
 274          * @param $options Array
 275          * @return mixed Database result resource, or false on failure
 276          */
 277         protected function pageData( $dbr, $conditions, $options = array() ) {
 278                 $fields = self::selectFields();
 279
 280                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 281
 282                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 283
 284                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 285
 286                 return $row;
 287         }
 288
 289         /**
 290          * Fetch a page record matching the Title object's namespace and title
 291          * using a sanitized title string
 292          *
 293          * @param $dbr DatabaseBase object
 294          * @param $title Title object
 295          * @param $options Array
 296          * @return mixed Database result resource, or false on failure
 297          */
 298         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 299                 return $this->pageData( $dbr, array(
 300                         'page_namespace' => $title->getNamespace(),
 301                         'page_title'     => $title->getDBkey() ), $options );
 302         }
 303
 304         /**
 305          * Fetch a page record matching the requested ID
 306          *
 307          * @param $dbr DatabaseBase
 308          * @param $id Integer
 309          * @param $options Array
 310          * @return mixed Database result resource, or false on failure
 311          */
 312         public function pageDataFromId( $dbr, $id, $options = array() ) {
 313                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 314         }
 315
 316         /**
 317          * Set the general counter, title etc data loaded from
 318          * some source.
 319          *
 320          * @param $from object|string|int One of the following:
 321          *        - A DB query result object
 322          *        - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB
 323          *        - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB
 324          *        - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB using SELECT FOR UPDATE
 325          *
 326          * @return void
 327          */
 328         public function loadPageData( $from = 'fromdb' ) {
 329                 $from = self::convertSelectType( $from );
 330                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 331                         // We already have the data from the correct location, no need to load it twice.
 332                         return;
 333                 }
 334
 335                 if ( $from === self::READ_LOCKING ) {
 336                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 337                 } elseif ( $from === self::READ_LATEST ) {
 338                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 339                 } elseif ( $from === self::READ_NORMAL ) {
 340                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 341                         # Use a "last rev inserted" timestamp key to dimish the issue of slave lag.
 342                         # Note that DB also stores the master position in the session and checks it.
 343                         $touched = $this->getCachedLastEditTime();
 344                         if ( $touched ) { // key set
 345                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 346                                         $from = self::READ_LATEST;
 347                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 348                                 }
 349                         }
 350                 } else {
 351                         // No idea from where the caller got this data, assume slave database.
 352                         $data = $from;
 353                         $from = self::READ_NORMAL;
 354                 }
 355
 356                 $this->loadFromRow( $data, $from );
 357         }
 358
 359         /**
 360          * Load the object from a database row
 361          *
 362          * @since 1.20
 363          * @param $data object: database row containing at least fields returned
 364          *        by selectFields()
 365          * @param $from string|int One of the following:
 366          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 367          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 368          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from from
 369          *          the master DB using SELECT FOR UPDATE
 370          */
 371         public function loadFromRow( $data, $from ) {
 372                 $lc = LinkCache::singleton();
 373
 374                 if ( $data ) {
 375                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 376
 377                         $this->mTitle->loadFromRow( $data );
 378
 379                         # Old-fashioned restrictions
 380                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 381
 382                         $this->mCounter     = intval( $data->page_counter );
 383                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 384                         $this->mIsRedirect  = intval( $data->page_is_redirect );
 385                         $this->mLatest      = intval( $data->page_latest );
 386                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 387                         // Double-check the ID of any cached latest Revision object for consistency.
 388                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 389                                 $this->mLastRevision = null;
 390                                 $this->mTimestamp = '';
 391                         }
 392                 } else {
 393                         $lc->addBadLinkObj( $this->mTitle );
 394
 395                         $this->mTitle->loadFromRow( false );
 396
 397                         $this->clearCacheFields();
 398                 }
 399
 400                 $this->mDataLoaded = true;
 401                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 402         }
 403
 404         /**
 405          * @return int Page ID
 406          */
 407         public function getId() {
 408                 return $this->mTitle->getArticleID();
 409         }
 410
 411         /**
 412          * @return bool Whether or not the page exists in the database
 413          */
 414         public function exists() {
 415                 return $this->mTitle->exists();
 416         }
 417
 418         /**
 419          * Check if this page is something we're going to be showing
 420          * some sort of sensible content for. If we return false, page
 421          * views (plain action=view) will return an HTTP 404 response,
 422          * so spiders and robots can know they're following a bad link.
 423          *
 424          * @return bool
 425          */
 426         public function hasViewableContent() {
 427                 return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
 428         }
 429
 430         /**
 431          * @return int The view count for the page
 432          */
 433         public function getCount() {
 434                 if ( !$this->mDataLoaded ) {
 435                         $this->loadPageData();
 436                 }
 437
 438                 return $this->mCounter;
 439         }
 440
 441         /**
 442          * Tests if the article content represents a redirect
 443          *
 444          * @return bool
 445          */
 446         public function isRedirect( ) {
 447                 $content = $this->getContent();
 448                 if ( !$content ) return false;
 449
 450                 return $content->isRedirect();
 451         }
 452
 453         /**
 454          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 455          *
 456          * Will use the revisions actual content model if the page exists,
 457          * and the page's default if the page doesn't exist yet.
 458          *
 459          * @return String
 460          *
 461          * @since 1.WD
 462          */
 463         public function getContentModel() {
 464                 if ( $this->exists() ) {
 465                         # look at the revision's actual content model
 466                         $rev = $this->getRevision();
 467
 468                         if ( $rev !== null ) {
 469                                 return $rev->getContentModel();
 470                         } else {
 471                                 wfWarn( "Page exists but has no revision!" );
 472                         }
 473                 }
 474
 475                 # use the default model for this page
 476                 return $this->mTitle->getContentModel();
 477         }
 478
 479         /**
 480          * Loads page_touched and returns a value indicating if it should be used
 481          * @return boolean true if not a redirect
 482          */
 483         public function checkTouched() {
 484                 if ( !$this->mDataLoaded ) {
 485                         $this->loadPageData();
 486                 }
 487                 return !$this->mIsRedirect;
 488         }
 489
 490         /**
 491          * Get the page_touched field
 492          * @return string containing GMT timestamp
 493          */
 494         public function getTouched() {
 495                 if ( !$this->mDataLoaded ) {
 496                         $this->loadPageData();
 497                 }
 498                 return $this->mTouched;
 499         }
 500
 501         /**
 502          * Get the page_latest field
 503          * @return integer rev_id of current revision
 504          */
 505         public function getLatest() {
 506                 if ( !$this->mDataLoaded ) {
 507                         $this->loadPageData();
 508                 }
 509                 return (int)$this->mLatest;
 510         }
 511
 512         /**
 513          * Get the Revision object of the oldest revision
 514          * @return Revision|null
 515          */
 516         public function getOldestRevision() {
 517                 wfProfileIn( __METHOD__ );
 518
 519                 // Try using the slave database first, then try the master
 520                 $continue = 2;
 521                 $db = wfGetDB( DB_SLAVE );
 522                 $revSelectFields = Revision::selectFields();
 523
 524                 while ( $continue ) {
 525                         $row = $db->selectRow(
 526                                 array( 'page', 'revision' ),
 527                                 $revSelectFields,
 528                                 array(
 529                                         'page_namespace' => $this->mTitle->getNamespace(),
 530                                         'page_title' => $this->mTitle->getDBkey(),
 531                                         'rev_page = page_id'
 532                                 ),
 533                                 __METHOD__,
 534                                 array(
 535                                         'ORDER BY' => 'rev_timestamp ASC'
 536                                 )
 537                         );
 538
 539                         if ( $row ) {
 540                                 $continue = 0;
 541                         } else {
 542                                 $db = wfGetDB( DB_MASTER );
 543                                 $continue--;
 544                         }
 545                 }
 546
 547                 wfProfileOut( __METHOD__ );
 548                 return $row ? Revision::newFromRow( $row ) : null;
 549         }
 550
 551         /**
 552          * Loads everything except the text
 553          * This isn't necessary for all uses, so it's only done if needed.
 554          */
 555         protected function loadLastEdit() {
 556                 if ( $this->mLastRevision !== null ) {
 557                         return; // already loaded
 558                 }
 559
 560                 $latest = $this->getLatest();
 561                 if ( !$latest ) {
 562                         return; // page doesn't exist or is missing page_latest info
 563                 }
 564
 565                 // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always includes the
 566                 // latest changes committed. This is true even within REPEATABLE-READ transactions, where
 567                 // S1 normally only sees changes committed before the first S1 SELECT. Thus we need S1 to
 568                 // also gets the revision row FOR UPDATE; otherwise, it may not find it since a page row
 569                 // UPDATE and revision row INSERT by S2 may have happened after the first S1 SELECT.
 570                 // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 571                 $flags = ( $this->mDataLoadedFrom == self::READ_LOCKING ) ? Revision::READ_LOCKING : 0;
 572                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 573                 if ( $revision ) { // sanity
 574                         $this->setLastEdit( $revision );
 575                 }
 576         }
 577
 578         /**
 579          * Set the latest revision
 580          */
 581         protected function setLastEdit( Revision $revision ) {
 582                 $this->mLastRevision = $revision;
 583                 $this->mTimestamp = $revision->getTimestamp();
 584         }
 585
 586         /**
 587          * Get the latest revision
 588          * @return Revision|null
 589          */
 590         public function getRevision() {
 591                 $this->loadLastEdit();
 592                 if ( $this->mLastRevision ) {
 593                         return $this->mLastRevision;
 594                 }
 595                 return null;
 596         }
 597
 598         /**
 599          * Get the content of the current revision. No side-effects...
 600          *
 601          * @param $audience Integer: one of:
 602          *      Revision::FOR_PUBLIC       to be displayed to all users
 603          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 604          *      Revision::RAW              get the text regardless of permissions
 605          * @return Content|null The content of the current revision
 606          *
 607          * @since 1.WD
 608          */
 609         public function getContent( $audience = Revision::FOR_PUBLIC ) {
 610                 $this->loadLastEdit();
 611                 if ( $this->mLastRevision ) {
 612                         return $this->mLastRevision->getContent( $audience );
 613                 }
 614                 return null;
 615         }
 616
 617         /**
 618          * Get the text of the current revision. No side-effects...
 619          *
 620          * @param $audience Integer: one of:
 621          *      Revision::FOR_PUBLIC       to be displayed to all users
 622          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 623          *      Revision::RAW              get the text regardless of permissions
 624          * @return String|false The text of the current revision
 625          * @deprecated as of 1.WD, getContent() should be used instead.
 626          */
 627         public function getText( $audience = Revision::FOR_PUBLIC ) { #@todo: deprecated, replace usage!
 628                 wfDeprecated( __METHOD__, '1.WD' );
 629
 630                 $this->loadLastEdit();
 631                 if ( $this->mLastRevision ) {
 632                         return $this->mLastRevision->getText( $audience );
 633                 }
 634                 return false;
 635         }
 636
 637         /**
 638          * Get the text of the current revision. No side-effects...
 639          *
 640          * @return String|bool The text of the current revision. False on failure
 641          * @deprecated as of 1.WD, getContent() should be used instead.
 642          */
 643         public function getRawText() {
 644                 wfDeprecated( __METHOD__, '1.WD' );
 645
 646                 return $this->getText( Revision::RAW );
 647         }
 648
 649         /**
 650          * @return string MW timestamp of last article revision
 651          */
 652         public function getTimestamp() {
 653                 // Check if the field has been filled by WikiPage::setTimestamp()
 654                 if ( !$this->mTimestamp ) {
 655                         $this->loadLastEdit();
 656                 }
 657
 658                 return wfTimestamp( TS_MW, $this->mTimestamp );
 659         }
 660
 661         /**
 662          * Set the page timestamp (use only to avoid DB queries)
 663          * @param $ts string MW timestamp of last article revision
 664          * @return void
 665          */
 666         public function setTimestamp( $ts ) {
 667                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 668         }
 669
 670         /**
 671          * @param $audience Integer: one of:
 672          *      Revision::FOR_PUBLIC       to be displayed to all users
 673          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 674          *      Revision::RAW              get the text regardless of permissions
 675          * @return int user ID for the user that made the last article revision
 676          */
 677         public function getUser( $audience = Revision::FOR_PUBLIC ) {
 678                 $this->loadLastEdit();
 679                 if ( $this->mLastRevision ) {
 680                         return $this->mLastRevision->getUser( $audience );
 681                 } else {
 682                         return -1;
 683                 }
 684         }
 685
 686         /**
 687          * Get the User object of the user who created the page
 688          * @param $audience Integer: one of:
 689          *      Revision::FOR_PUBLIC       to be displayed to all users
 690          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 691          *      Revision::RAW              get the text regardless of permissions
 692          * @return User|null
 693          */
 694         public function getCreator( $audience = Revision::FOR_PUBLIC ) {
 695                 $revision = $this->getOldestRevision();
 696                 if ( $revision ) {
 697                         $userName = $revision->getUserText( $audience );
 698                         return User::newFromName( $userName, false );
 699                 } else {
 700                         return null;
 701                 }
 702         }
 703
 704         /**
 705          * @param $audience Integer: one of:
 706          *      Revision::FOR_PUBLIC       to be displayed to all users
 707          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 708          *      Revision::RAW              get the text regardless of permissions
 709          * @return string username of the user that made the last article revision
 710          */
 711         public function getUserText( $audience = Revision::FOR_PUBLIC ) {
 712                 $this->loadLastEdit();
 713                 if ( $this->mLastRevision ) {
 714                         return $this->mLastRevision->getUserText( $audience );
 715                 } else {
 716                         return '';
 717                 }
 718         }
 719
 720         /**
 721          * @param $audience Integer: one of:
 722          *      Revision::FOR_PUBLIC       to be displayed to all users
 723          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 724          *      Revision::RAW              get the text regardless of permissions
 725          * @return string Comment stored for the last article revision
 726          */
 727         public function getComment( $audience = Revision::FOR_PUBLIC ) {
 728                 $this->loadLastEdit();
 729                 if ( $this->mLastRevision ) {
 730                         return $this->mLastRevision->getComment( $audience );
 731                 } else {
 732                         return '';
 733                 }
 734         }
 735
 736         /**
 737          * Returns true if last revision was marked as "minor edit"
 738          *
 739          * @return boolean Minor edit indicator for the last article revision.
 740          */
 741         public function getMinorEdit() {
 742                 $this->loadLastEdit();
 743                 if ( $this->mLastRevision ) {
 744                         return $this->mLastRevision->isMinor();
 745                 } else {
 746                         return false;
 747                 }
 748         }
 749
 750         /**
 751          * Get the cached timestamp for the last time the page changed.
 752          * This is only used to help handle slave lag by comparing to page_touched.
 753          * @return string MW timestamp
 754          */
 755         protected function getCachedLastEditTime() {
 756                 global $wgMemc;
 757                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 758                 return $wgMemc->get( $key );
 759         }
 760
 761         /**
 762          * Set the cached timestamp for the last time the page changed.
 763          * This is only used to help handle slave lag by comparing to page_touched.
 764          * @param $timestamp string
 765          * @return void
 766          */
 767         public function setCachedLastEditTime( $timestamp ) {
 768                 global $wgMemc;
 769                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 770                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60*15 );
 771         }
 772
 773         /**
 774          * Determine whether a page would be suitable for being counted as an
 775          * article in the site_stats table based on the title & its content
 776          *
 777          * @param $editInfo Object or false: object returned by prepareTextForEdit(),
 778          *        if false, the current database state will be used
 779          * @return Boolean
 780          */
 781         public function isCountable( $editInfo = false ) {
 782                 global $wgArticleCountMethod;
 783
 784                 if ( !$this->mTitle->isContentPage() ) {
 785                         return false;
 786                 }
 787
 788                 if ( $editInfo ) {
 789                         $content = $editInfo->pstContent;
 790                 } else {
 791                         $content = $this->getContent();
 792                 }
 793
 794                 if ( !$content || $content->isRedirect( ) ) {
 795                         return false;
 796                 }
 797
 798                 $hasLinks = null;
 799
 800                 if ( $wgArticleCountMethod === 'link' ) {
 801                         # nasty special case to avoid re-parsing to detect links
 802
 803                         if ( $editInfo ) {
 804                                 // ParserOutput::getLinks() is a 2D array of page links, so
 805                                 // to be really correct we would need to recurse in the array
 806                                 // but the main array should only have items in it if there are
 807                                 // links.
 808                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 809                         } else {
 810                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 811                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 812                         }
 813                 }
 814
 815                 return $content->isCountable( $hasLinks );
 816         }
 817
 818         /**
 819          * If this page is a redirect, get its target
 820          *
 821          * The target will be fetched from the redirect table if possible.
 822          * If this page doesn't have an entry there, call insertRedirect()
 823          * @return Title|mixed object, or null if this page is not a redirect
 824          */
 825         public function getRedirectTarget() {
 826                 if ( !$this->mTitle->isRedirect() ) {
 827                         return null;
 828                 }
 829
 830                 if ( $this->mRedirectTarget !== null ) {
 831                         return $this->mRedirectTarget;
 832                 }
 833
 834                 # Query the redirect table
 835                 $dbr = wfGetDB( DB_SLAVE );
 836                 $row = $dbr->selectRow( 'redirect',
 837                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 838                         array( 'rd_from' => $this->getId() ),
 839                         __METHOD__
 840                 );
 841
 842                 // rd_fragment and rd_interwiki were added later, populate them if empty
 843                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 844                         return $this->mRedirectTarget = Title::makeTitle(
 845                                 $row->rd_namespace, $row->rd_title,
 846                                 $row->rd_fragment, $row->rd_interwiki );
 847                 }
 848
 849                 # This page doesn't have an entry in the redirect table
 850                 return $this->mRedirectTarget = $this->insertRedirect();
 851         }
 852
 853         /**
 854          * Insert an entry for this page into the redirect table.
 855          *
 856          * Don't call this function directly unless you know what you're doing.
 857          * @return Title object or null if not a redirect
 858          */
 859         public function insertRedirect() {
 860                 // recurse through to only get the final target
 861                 $content = $this->getContent();
 862                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 863                 if ( !$retval ) {
 864                         return null;
 865                 }
 866                 $this->insertRedirectEntry( $retval );
 867                 return $retval;
 868         }
 869
 870         /**
 871          * Insert or update the redirect table entry for this page to indicate
 872          * it redirects to $rt .
 873          * @param $rt Title redirect target
 874          */
 875         public function insertRedirectEntry( $rt ) {
 876                 $dbw = wfGetDB( DB_MASTER );
 877                 $dbw->replace( 'redirect', array( 'rd_from' ),
 878                         array(
 879                                 'rd_from'      => $this->getId(),
 880                                 'rd_namespace' => $rt->getNamespace(),
 881                                 'rd_title'     => $rt->getDBkey(),
 882                                 'rd_fragment'  => $rt->getFragment(),
 883                                 'rd_interwiki' => $rt->getInterwiki(),
 884                         ),
 885                         __METHOD__
 886                 );
 887         }
 888
 889         /**
 890          * Get the Title object or URL this page redirects to
 891          *
 892          * @return mixed false, Title of in-wiki target, or string with URL
 893          */
 894         public function followRedirect() {
 895                 return $this->getRedirectURL( $this->getRedirectTarget() );
 896         }
 897
 898         /**
 899          * Get the Title object or URL to use for a redirect. We use Title
 900          * objects for same-wiki, non-special redirects and URLs for everything
 901          * else.
 902          * @param $rt Title Redirect target
 903          * @return mixed false, Title object of local target, or string with URL
 904          */
 905         public function getRedirectURL( $rt ) {
 906                 if ( !$rt ) {
 907                         return false;
 908                 }
 909
 910                 if ( $rt->isExternal() ) {
 911                         if ( $rt->isLocal() ) {
 912                                 // Offsite wikis need an HTTP redirect.
 913                                 //
 914                                 // This can be hard to reverse and may produce loops,
 915                                 // so they may be disabled in the site configuration.
 916                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 917                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 918                         } else {
 919                                 // External pages pages without "local" bit set are not valid
 920                                 // redirect targets
 921                                 return false;
 922                         }
 923                 }
 924
 925                 if ( $rt->isSpecialPage() ) {
 926                         // Gotta handle redirects to special pages differently:
 927                         // Fill the HTTP response "Location" header and ignore
 928                         // the rest of the page we're on.
 929                         //
 930                         // Some pages are not valid targets
 931                         if ( $rt->isValidRedirectTarget() ) {
 932                                 return $rt->getFullURL();
 933                         } else {
 934                                 return false;
 935                         }
 936                 }
 937
 938                 return $rt;
 939         }
 940
 941         /**
 942          * Get a list of users who have edited this article, not including the user who made
 943          * the most recent revision, which you can get from $article->getUser() if you want it
 944          * @return UserArrayFromResult
 945          */
 946         public function getContributors() {
 947                 # @todo FIXME: This is expensive; cache this info somewhere.
 948
 949                 $dbr = wfGetDB( DB_SLAVE );
 950
 951                 if ( $dbr->implicitGroupby() ) {
 952                         $realNameField = 'user_real_name';
 953                 } else {
 954                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 955                 }
 956
 957                 $tables = array( 'revision', 'user' );
 958
 959                 $fields = array(
 960                         'user_id' => 'rev_user',
 961                         'user_name' => 'rev_user_text',
 962                         $realNameField,
 963                         'timestamp' => 'MAX(rev_timestamp)',
 964                 );
 965
 966                 $conds = array( 'rev_page' => $this->getId() );
 967
 968                 // The user who made the top revision gets credited as "this page was last edited by
 969                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
 970                 $user = $this->getUser();
 971                 if ( $user ) {
 972                         $conds[] = "rev_user != $user";
 973                 } else {
 974                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
 975                 }
 976
 977                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
 978
 979                 $jconds = array(
 980                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
 981                 );
 982
 983                 $options = array(
 984                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
 985                         'ORDER BY' => 'timestamp DESC',
 986                 );
 987
 988                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
 989                 return new UserArrayFromResult( $res );
 990         }
 991
 992         /**
 993          * Get the last N authors
 994          * @param $num Integer: number of revisions to get
 995          * @param $revLatest String: the latest rev_id, selected from the master (optional)
 996          * @return array Array of authors, duplicates not removed
 997          */
 998         public function getLastNAuthors( $num, $revLatest = 0 ) {
 999                 wfProfileIn( __METHOD__ );
1000                 // First try the slave
1001                 // If that doesn't have the latest revision, try the master
1002                 $continue = 2;
1003                 $db = wfGetDB( DB_SLAVE );
1004
1005                 do {
1006                         $res = $db->select( array( 'page', 'revision' ),
1007                                 array( 'rev_id', 'rev_user_text' ),
1008                                 array(
1009                                         'page_namespace' => $this->mTitle->getNamespace(),
1010                                         'page_title' => $this->mTitle->getDBkey(),
1011                                         'rev_page = page_id'
1012                                 ), __METHOD__,
1013                                 array(
1014                                         'ORDER BY' => 'rev_timestamp DESC',
1015                                         'LIMIT' => $num
1016                                 )
1017                         );
1018
1019                         if ( !$res ) {
1020                                 wfProfileOut( __METHOD__ );
1021                                 return array();
1022                         }
1023
1024                         $row = $db->fetchObject( $res );
1025
1026                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1027                                 $db = wfGetDB( DB_MASTER );
1028                                 $continue--;
1029                         } else {
1030                                 $continue = 0;
1031                         }
1032                 } while ( $continue );
1033
1034                 $authors = array( $row->rev_user_text );
1035
1036                 foreach ( $res as $row ) {
1037                         $authors[] = $row->rev_user_text;
1038                 }
1039
1040                 wfProfileOut( __METHOD__ );
1041                 return $authors;
1042         }
1043
1044         /**
1045          * Should the parser cache be used?
1046          *
1047          * @param $parserOptions ParserOptions to check
1048          * @param $oldid int
1049          * @return boolean
1050          */
1051         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1052                 global $wgEnableParserCache;
1053
1054                 return $wgEnableParserCache
1055                         && $parserOptions->getStubThreshold() == 0
1056                         && $this->mTitle->exists()
1057                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1058                         && $this->getContentHandler()->isParserCacheSupported();
1059         }
1060
1061         /**
1062          * Get a ParserOutput for the given ParserOptions and revision ID.
1063          * The parser cache will be used if possible.
1064          *
1065          * @since 1.19
1066          * @param $parserOptions ParserOptions to use for the parse operation
1067          * @param $oldid Revision ID to get the text from, passing null or 0 will
1068          *               get the current revision (default value)
1069          *
1070          * @return ParserOutput or false if the revision was not found
1071          */
1072         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1073                 wfProfileIn( __METHOD__ );
1074
1075                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1076                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1077                 if ( $parserOptions->getStubThreshold() ) {
1078                         wfIncrStats( 'pcache_miss_stub' );
1079                 }
1080
1081                 if ( $useParserCache ) {
1082                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1083                         if ( $parserOutput !== false ) {
1084                                 wfProfileOut( __METHOD__ );
1085                                 return $parserOutput;
1086                         }
1087                 }
1088
1089                 if ( $oldid === null || $oldid === 0 ) {
1090                         $oldid = $this->getLatest();
1091                 }
1092
1093                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1094                 $pool->execute();
1095
1096                 wfProfileOut( __METHOD__ );
1097
1098                 return $pool->getParserOutput();
1099         }
1100
1101         /**
1102          * Do standard deferred updates after page view
1103          * @param $user User The relevant user
1104          */
1105         public function doViewUpdates( User $user ) {
1106                 global $wgDisableCounters;
1107                 if ( wfReadOnly() ) {
1108                         return;
1109                 }
1110
1111                 # Don't update page view counters on views from bot users (bug 14044)
1112                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
1113                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1114                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1115                 }
1116
1117                 # Update newtalk / watchlist notification status
1118                 $user->clearNotification( $this->mTitle );
1119         }
1120
1121         /**
1122          * Perform the actions of a page purging
1123          * @return bool
1124          */
1125         public function doPurge() {
1126                 global $wgUseSquid;
1127
1128                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ){
1129                         return false;
1130                 }
1131
1132                 // Invalidate the cache
1133                 $this->mTitle->invalidateCache();
1134                 $this->clear();
1135
1136                 if ( $wgUseSquid ) {
1137                         // Commit the transaction before the purge is sent
1138                         $dbw = wfGetDB( DB_MASTER );
1139                         $dbw->commit( __METHOD__ );
1140
1141                         // Send purge
1142                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1143                         $update->doUpdate();
1144                 }
1145
1146                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1147                         //@todo: move this logic to MessageCache
1148
1149                         if ( $this->mTitle->exists() ) {
1150                                 // NOTE: use transclusion text for messages.
1151                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1152
1153                                 $content = $this->getContent();
1154                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1155
1156                                 if ( $text === null ) $text = false;
1157                         } else {
1158                                 $text = false;
1159                         }
1160
1161                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1162                 }
1163                 return true;
1164         }
1165
1166         /**
1167          * Insert a new empty page record for this article.
1168          * This *must* be followed up by creating a revision
1169          * and running $this->updateRevisionOn( ... );
1170          * or else the record will be left in a funky state.
1171          * Best if all done inside a transaction.
1172          *
1173          * @param $dbw DatabaseBase
1174          * @return int The newly created page_id key, or false if the title already existed
1175          */
1176         public function insertOn( $dbw ) {
1177                 wfProfileIn( __METHOD__ );
1178
1179                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1180                 $dbw->insert( 'page', array(
1181                         'page_id'           => $page_id,
1182                         'page_namespace'    => $this->mTitle->getNamespace(),
1183                         'page_title'        => $this->mTitle->getDBkey(),
1184                         'page_counter'      => 0,
1185                         'page_restrictions' => '',
1186                         'page_is_redirect'  => 0, # Will set this shortly...
1187                         'page_is_new'       => 1,
1188                         'page_random'       => wfRandom(),
1189                         'page_touched'      => $dbw->timestamp(),
1190                         'page_latest'       => 0, # Fill this in shortly...
1191                         'page_len'          => 0, # Fill this in shortly...
1192                 ), __METHOD__, 'IGNORE' );
1193
1194                 $affected = $dbw->affectedRows();
1195
1196                 if ( $affected ) {
1197                         $newid = $dbw->insertId();
1198                         $this->mTitle->resetArticleID( $newid );
1199                 }
1200                 wfProfileOut( __METHOD__ );
1201
1202                 return $affected ? $newid : false;
1203         }
1204
1205         /**
1206          * Update the page record to point to a newly saved revision.
1207          *
1208          * @param $dbw DatabaseBase: object
1209          * @param $revision Revision: For ID number, and text used to set
1210          *                  length and redirect status fields
1211          * @param $lastRevision Integer: if given, will not overwrite the page field
1212          *                      when different from the currently set value.
1213          *                      Giving 0 indicates the new page flag should be set
1214          *                      on.
1215          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1216          *                           removing rows in redirect table.
1217          * @return bool true on success, false on failure
1218          * @private
1219          */
1220         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1221                 global $wgContentHandlerUseDB;
1222
1223                 wfProfileIn( __METHOD__ );
1224
1225                 $content = $revision->getContent();
1226                 $len = $content->getSize();
1227                 $rt = $content->getUltimateRedirectTarget();
1228
1229                 $conditions = array( 'page_id' => $this->getId() );
1230
1231                 if ( !is_null( $lastRevision ) ) {
1232                         # An extra check against threads stepping on each other
1233                         $conditions['page_latest'] = $lastRevision;
1234                 }
1235
1236                 $now = wfTimestampNow();
1237                 $row = array( /* SET */
1238                         'page_latest'      => $revision->getId(),
1239                         'page_touched'     => $dbw->timestamp( $now ),
1240                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1241                         'page_is_redirect' => $rt !== null ? 1 : 0,
1242                         'page_len'         => $len,
1243                 );
1244
1245                 if ( $wgContentHandlerUseDB ) {
1246                         $row[ 'page_content_model' ] = $revision->getContentModel();
1247                 }
1248
1249                 $dbw->update( 'page',
1250                         $row,
1251                         $conditions,
1252                         __METHOD__ );
1253
1254                 $result = $dbw->affectedRows() > 0;
1255                 if ( $result ) {
1256                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1257                         $this->setLastEdit( $revision );
1258                         $this->setCachedLastEditTime( $now );
1259                         $this->mLatest = $revision->getId();
1260                         $this->mIsRedirect = (bool)$rt;
1261                         # Update the LinkCache.
1262                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect,
1263                                                                                                         $this->mLatest, $revision->getContentModel() );
1264                 }
1265
1266                 wfProfileOut( __METHOD__ );
1267                 return $result;
1268         }
1269
1270         /**
1271          * Add row to the redirect table if this is a redirect, remove otherwise.
1272          *
1273          * @param $dbw DatabaseBase
1274          * @param $redirectTitle Title object pointing to the redirect target,
1275          *                       or NULL if this is not a redirect
1276          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1277          *                           removing rows in redirect table.
1278          * @return bool true on success, false on failure
1279          * @private
1280          */
1281         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1282                 // Always update redirects (target link might have changed)
1283                 // Update/Insert if we don't know if the last revision was a redirect or not
1284                 // Delete if changing from redirect to non-redirect
1285                 $isRedirect = !is_null( $redirectTitle );
1286
1287                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1288                         return true;
1289                 }
1290
1291                 wfProfileIn( __METHOD__ );
1292                 if ( $isRedirect ) {
1293                         $this->insertRedirectEntry( $redirectTitle );
1294                 } else {
1295                         // This is not a redirect, remove row from redirect table
1296                         $where = array( 'rd_from' => $this->getId() );
1297                         $dbw->delete( 'redirect', $where, __METHOD__ );
1298                 }
1299
1300                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1301                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1302                 }
1303                 wfProfileOut( __METHOD__ );
1304
1305                 return ( $dbw->affectedRows() != 0 );
1306         }
1307
1308         /**
1309          * If the given revision is newer than the currently set page_latest,
1310          * update the page record. Otherwise, do nothing.
1311          *
1312          * @param $dbw DatabaseBase object
1313          * @param $revision Revision object
1314          * @return mixed
1315          */
1316         public function updateIfNewerOn( $dbw, $revision ) {
1317                 wfProfileIn( __METHOD__ );
1318
1319                 $row = $dbw->selectRow(
1320                         array( 'revision', 'page' ),
1321                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1322                         array(
1323                                 'page_id' => $this->getId(),
1324                                 'page_latest=rev_id' ),
1325                         __METHOD__ );
1326
1327                 if ( $row ) {
1328                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1329                                 wfProfileOut( __METHOD__ );
1330                                 return false;
1331                         }
1332                         $prev = $row->rev_id;
1333                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1334                 } else {
1335                         # No or missing previous revision; mark the page as new
1336                         $prev = 0;
1337                         $lastRevIsRedirect = null;
1338                 }
1339
1340                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1341
1342                 wfProfileOut( __METHOD__ );
1343                 return $ret;
1344         }
1345
1346     /**
1347      * Get the content that needs to be saved in order to undo all revisions
1348      * between $undo and $undoafter. Revisions must belong to the same page,
1349      * must exist and must not be deleted
1350      * @param $undo Revision
1351      * @param $undoafter Revision Must be an earlier revision than $undo
1352      * @return mixed string on success, false on failure
1353      * @since 1.WD
1354      * Before we had the Content object, this was done in getUndoText
1355      */
1356     public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1357         $handler = $undo->getContentHandler();
1358         return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1359     }
1360
1361         /**
1362          * Get the text that needs to be saved in order to undo all revisions
1363          * between $undo and $undoafter. Revisions must belong to the same page,
1364          * must exist and must not be deleted
1365          * @param $undo Revision
1366          * @param $undoafter Revision Must be an earlier revision than $undo
1367          * @return mixed string on success, false on failure
1368          * @deprecated since 1.WD: use ContentHandler::getUndoContent() instead.
1369          */
1370         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1371                 wfDeprecated( __METHOD__, '1.WD' );
1372
1373                 $this->loadLastEdit();
1374
1375                 if ( $this->mLastRevision ) {
1376                         if ( is_null( $undoafter ) ) {
1377                                 $undoafter = $undo->getPrevious();
1378                         }
1379
1380                         $handler = $this->getContentHandler();
1381                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1382
1383                         if ( !$undone ) {
1384                                 return false;
1385                         } else {
1386                                 return ContentHandler::getContentText( $undone );
1387                         }
1388                 }
1389
1390                 return false;
1391         }
1392
1393         /**
1394          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1395          * @param $text String: new text of the section
1396          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1397          * @param $edittime String: revision timestamp or null to use the current revision
1398          * @return String new complete article text, or null if error
1399          *
1400          * @deprecated since 1.WD, use replaceSectionContent() instead
1401          */
1402         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1403                 wfDeprecated( __METHOD__, '1.WD' );
1404
1405                 if ( strval( $section ) == '' ) { //NOTE: keep condition in sync with condition in replaceSectionContent!
1406                         // Whole-page edit; let the whole text through
1407                         return $text;
1408                 }
1409
1410                 if ( !$this->supportsSections() ) {
1411                         throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1412                 }
1413
1414                 # could even make section title, but that's not required.
1415                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() );
1416
1417                 $newContent = $this->replaceSectionContent( $section, $sectionContent, $sectionTitle, $edittime );
1418
1419                 return ContentHandler::getContentText( $newContent );
1420         }
1421
1422         /**
1423          * Returns true iff this page's content model supports sections.
1424          *
1425          * @return boolean whether sections are supported.
1426          *
1427          * @todo: the skin should check this and not offer section functionality if sections are not supported.
1428          * @todo: the EditPage should check this and not offer section functionality if sections are not supported.
1429          */
1430         public function supportsSections() {
1431                 return $this->getContentHandler()->supportsSections();
1432         }
1433
1434         /**
1435          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1436          * @param $content Content: new content of the section
1437          * @param $sectionTitle String: new section's subject, only if $section is 'new'
1438          * @param $edittime String: revision timestamp or null to use the current revision
1439          *
1440          * @return Content new complete article content, or null if error
1441          *
1442          * @since 1.WD
1443          */
1444         public function replaceSectionContent( $section, Content $sectionContent, $sectionTitle = '', $edittime = null ) {
1445                 wfProfileIn( __METHOD__ );
1446
1447                 if ( strval( $section ) == '' ) {
1448                         // Whole-page edit; let the whole text through
1449                         $newContent = $sectionContent;
1450                 } else {
1451                         if ( !$this->supportsSections() ) {
1452                                 throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1453                         }
1454
1455                         // Bug 30711: always use current version when adding a new section
1456                         if ( is_null( $edittime ) || $section == 'new' ) {
1457                                 $oldContent = $this->getContent();
1458                                 if ( ! $oldContent ) {
1459                                         wfDebug( __METHOD__ . ": no page text\n" );
1460                                         wfProfileOut( __METHOD__ );
1461                                         return null;
1462                                 }
1463                         } else {
1464                                 $dbw = wfGetDB( DB_MASTER );
1465                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1466
1467                                 if ( !$rev ) {
1468                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1469                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1470                                         wfProfileOut( __METHOD__ );
1471                                         return null;
1472                                 }
1473
1474                                 $oldContent = $rev->getContent();
1475                         }
1476
1477                         $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1478                 }
1479
1480                 wfProfileOut( __METHOD__ );
1481                 return $newContent;
1482         }
1483
1484         /**
1485          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1486          * @param $flags Int
1487          * @return Int updated $flags
1488          */
1489         function checkFlags( $flags ) {
1490                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1491                         if ( $this->mTitle->getArticleID() ) {
1492                                 $flags |= EDIT_UPDATE;
1493                         } else {
1494                                 $flags |= EDIT_NEW;
1495                         }
1496                 }
1497
1498                 return $flags;
1499         }
1500
1501         /**
1502          * Change an existing article or create a new article. Updates RC and all necessary caches,
1503          * optionally via the deferred update array.
1504          *
1505          * @param $text String: new text
1506          * @param $summary String: edit summary
1507          * @param $flags Integer bitfield:
1508          *      EDIT_NEW
1509          *          Article is known or assumed to be non-existent, create a new one
1510          *      EDIT_UPDATE
1511          *          Article is known or assumed to be pre-existing, update it
1512          *      EDIT_MINOR
1513          *          Mark this edit minor, if the user is allowed to do so
1514          *      EDIT_SUPPRESS_RC
1515          *          Do not log the change in recentchanges
1516          *      EDIT_FORCE_BOT
1517          *          Mark the edit a "bot" edit regardless of user rights
1518          *      EDIT_DEFER_UPDATES
1519          *          Defer some of the updates until the end of index.php
1520          *      EDIT_AUTOSUMMARY
1521          *          Fill in blank summaries with generated text where possible
1522          *
1523          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1524          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1525          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1526          * edit-already-exists error will be returned. These two conditions are also possible with
1527          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1528          *
1529          * @param $baseRevId int the revision ID this edit was based off, if any
1530          * @param $user User the user doing the edit
1531          *
1532          * @return Status object. Possible errors:
1533          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1534          *     edit-gone-missing:       In update mode, but the article didn't exist
1535          *     edit-conflict:           In update mode, the article changed unexpectedly
1536          *     edit-no-change:          Warning that the text was the same as before
1537          *     edit-already-exists:     In creation mode, but the article already exists
1538          *
1539          *  Extensions may define additional errors.
1540          *
1541          *  $return->value will contain an associative array with members as follows:
1542          *     new:                     Boolean indicating if the function attempted to create a new article
1543          *     revision:                The revision object for the inserted revision, or null
1544          *
1545          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1546          *
1547          * @deprecated since 1.WD: use doEditContent() instead.
1548          * @todo: use doEditContent() instead everywhere
1549          */
1550         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1551                 wfDeprecated( __METHOD__, '1.WD' );
1552
1553                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1554
1555                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1556         }
1557
1558         /**
1559          * Change an existing article or create a new article. Updates RC and all necessary caches,
1560          * optionally via the deferred update array.
1561          *
1562          * @param $content Content: new content
1563          * @param $summary String: edit summary
1564          * @param $flags Integer bitfield:
1565          *      EDIT_NEW
1566          *          Article is known or assumed to be non-existent, create a new one
1567          *      EDIT_UPDATE
1568          *          Article is known or assumed to be pre-existing, update it
1569          *      EDIT_MINOR
1570          *          Mark this edit minor, if the user is allowed to do so
1571          *      EDIT_SUPPRESS_RC
1572          *          Do not log the change in recentchanges
1573          *      EDIT_FORCE_BOT
1574          *          Mark the edit a "bot" edit regardless of user rights
1575          *      EDIT_DEFER_UPDATES
1576          *          Defer some of the updates until the end of index.php
1577          *      EDIT_AUTOSUMMARY
1578          *          Fill in blank summaries with generated text where possible
1579          *
1580          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1581          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1582          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1583          * edit-already-exists error will be returned. These two conditions are also possible with
1584          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1585          *
1586          * @param $baseRevId the revision ID this edit was based off, if any
1587          * @param $user User the user doing the edit
1588          * @param $serialisation_format String: format for storing the content in the database
1589          *
1590          * @return Status object. Possible errors:
1591          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1592          *     edit-gone-missing:       In update mode, but the article didn't exist
1593          *     edit-conflict:           In update mode, the article changed unexpectedly
1594          *     edit-no-change:          Warning that the text was the same as before
1595          *     edit-already-exists:     In creation mode, but the article already exists
1596          *
1597          *  Extensions may define additional errors.
1598          *
1599          *  $return->value will contain an associative array with members as follows:
1600          *     new:                     Boolean indicating if the function attempted to create a new article
1601          *     revision:                The revision object for the inserted revision, or null
1602          *
1603          * @since 1.WD
1604          */
1605         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1606                                                                    User $user = null, $serialisation_format = null ) {
1607                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1608
1609                 # Low-level sanity check
1610                 if ( $this->mTitle->getText() === '' ) {
1611                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1612                 }
1613
1614                 wfProfileIn( __METHOD__ );
1615
1616                 $user = is_null( $user ) ? $wgUser : $user;
1617                 $status = Status::newGood( array() );
1618
1619                 // Load the data from the master database if needed.
1620                 // The caller may already loaded it from the master or even loaded it using
1621                 // SELECT FOR UPDATE, so do not override that using clear().
1622                 $this->loadPageData( 'fromdbmaster' );
1623
1624                 $flags = $this->checkFlags( $flags );
1625
1626                 # call legacy hook
1627                 $hook_ok = wfRunHooks( 'ArticleContentSave', array( &$this, &$user, &$content, &$summary,
1628                         $flags & EDIT_MINOR, null, null, &$flags, &$status ) );
1629
1630                 if ( $hook_ok && Hooks::isRegistered( 'ArticleSave' ) ) { # avoid serialization overhead if the hook isn't present
1631                         $content_text = $content->serialize();
1632                         $txt = $content_text; # clone
1633
1634                         $hook_ok = wfRunHooks( 'ArticleSave', array( &$this, &$user, &$txt, &$summary,
1635                                 $flags & EDIT_MINOR, null, null, &$flags, &$status ) ); #TODO: survey extensions using this hook
1636
1637                         if ( $txt !== $content_text ) {
1638                                 # if the text changed, unserialize the new version to create an updated Content object.
1639                                 $content = $content->getContentHandler()->unserializeContent( $txt );
1640                         }
1641                 }
1642
1643                 if ( !$hook_ok ) {
1644                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1645
1646                         if ( $status->isOK() ) {
1647                                 $status->fatal( 'edit-hook-aborted' );
1648                         }
1649
1650                         wfProfileOut( __METHOD__ );
1651                         return $status;
1652                 }
1653
1654                 # Silently ignore EDIT_MINOR if not allowed
1655                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1656                 $bot = $flags & EDIT_FORCE_BOT;
1657
1658                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1659
1660                 $oldsize = $old_content ? $old_content->getSize() : 0;
1661                 $oldid = $this->getLatest();
1662                 $oldIsRedirect = $this->isRedirect();
1663                 $oldcountable = $this->isCountable();
1664
1665                 $handler = $content->getContentHandler();
1666
1667                 # Provide autosummaries if one is not provided and autosummaries are enabled.
1668                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1669                         if ( !$old_content ) $old_content = null;
1670                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1671                 }
1672
1673                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1674                 $serialized = $editInfo->pst;
1675                 $content = $editInfo->pstContent;
1676                 $newsize =  $content->getSize();
1677
1678                 $dbw = wfGetDB( DB_MASTER );
1679                 $now = wfTimestampNow();
1680                 $this->mTimestamp = $now;
1681
1682                 if ( $flags & EDIT_UPDATE ) {
1683                         # Update article, but only if changed.
1684                         $status->value['new'] = false;
1685
1686                         if ( !$oldid ) {
1687                                 # Article gone missing
1688                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1689                                 $status->fatal( 'edit-gone-missing' );
1690
1691                                 wfProfileOut( __METHOD__ );
1692                                 return $status;
1693                         } elseif ( !$old_content ) {
1694                                 # Sanity check for bug 37225
1695                                 wfProfileOut( __METHOD__ );
1696                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1697                         }
1698
1699                         $revision = new Revision( array(
1700                                 'page'       => $this->getId(),
1701                                 'comment'    => $summary,
1702                                 'minor_edit' => $isminor,
1703                                 'text'       => $serialized,
1704                                 'len'        => $newsize,
1705                                 'parent_id'  => $oldid,
1706                                 'user'       => $user->getId(),
1707                                 'user_text'  => $user->getName(),
1708                                 'timestamp'  => $now,
1709                                 'content_model' => $content->getModel(),
1710                                 'content_format' => $serialisation_format,
1711                         ) ); #XXX: pass content object?!
1712
1713                         # Bug 37225: use accessor to get the text as Revision may trim it.
1714                         # After trimming, the text may be a duplicate of the current text.
1715                         $content = $revision->getContent(); // sanity; EditPage should trim already
1716
1717                         $changed = !$content->equals( $old_content );
1718
1719                         if ( $changed ) {
1720                                 if ( !$content->isValid() ) {
1721                                         throw new MWException( "New content failed validity check!" );
1722                                 }
1723
1724                                 $dbw->begin( __METHOD__ );
1725
1726                                 $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1727                                 $status->merge( $prepStatus );
1728
1729                                 if ( !$status->isOK() ) {
1730                                         $dbw->rollback();
1731
1732                                         wfProfileOut( __METHOD__ );
1733                                         return $status;
1734                                 }
1735
1736                                 $revisionId = $revision->insertOn( $dbw );
1737
1738                                 # Update page
1739                                 #
1740                                 # Note that we use $this->mLatest instead of fetching a value from the master DB
1741                                 # during the course of this function. This makes sure that EditPage can detect
1742                                 # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1743                                 # before this function is called. A previous function used a separate query, this
1744                                 # creates a window where concurrent edits can cause an ignored edit conflict.
1745                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1746
1747                                 if ( !$ok ) {
1748                                         # Belated edit conflict! Run away!!
1749                                         $status->fatal( 'edit-conflict' );
1750
1751                                         $dbw->rollback( __METHOD__ );
1752
1753                                         wfProfileOut( __METHOD__ );
1754                                         return $status;
1755                                 }
1756
1757                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1758                                 # Update recentchanges
1759                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1760                                         # Mark as patrolled if the user can do so
1761                                         $patrolled = $wgUseRCPatrol && !count(
1762                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1763                                         # Add RC row to the DB
1764                                         $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1765                                                 $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1766                                                 $revisionId, $patrolled
1767                                         );
1768
1769                                         # Log auto-patrolled edits
1770                                         if ( $patrolled ) {
1771                                                 PatrolLog::record( $rc, true, $user );
1772                                         }
1773                                 }
1774                                 $user->incEditCount();
1775                                 $dbw->commit( __METHOD__ );
1776                         } else {
1777                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1778                                 // related variables correctly
1779                                 $revision->setId( $this->getLatest() );
1780                         }
1781
1782                         # Update links tables, site stats, etc.
1783                         $this->doEditUpdates(
1784                                 $revision,
1785                                 $user,
1786                                 array(
1787                                         'changed' => $changed,
1788                                         'oldcountable' => $oldcountable
1789                                 )
1790                         );
1791
1792                         if ( !$changed ) {
1793                                 $status->warning( 'edit-no-change' );
1794                                 $revision = null;
1795                                 // Update page_touched, this is usually implicit in the page update
1796                                 // Other cache updates are done in onArticleEdit()
1797                                 $this->mTitle->invalidateCache();
1798                         }
1799                 } else {
1800                         # Create new article
1801                         $status->value['new'] = true;
1802
1803                         $dbw->begin( __METHOD__ );
1804
1805                         $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1806                         $status->merge( $prepStatus );
1807
1808                         if ( !$status->isOK() ) {
1809                                 $dbw->rollback();
1810
1811                                 wfProfileOut( __METHOD__ );
1812                                 return $status;
1813                         }
1814
1815                         $status->merge( $prepStatus );
1816
1817                         # Add the page record; stake our claim on this title!
1818                         # This will return false if the article already exists
1819                         $newid = $this->insertOn( $dbw );
1820
1821                         if ( $newid === false ) {
1822                                 $dbw->rollback( __METHOD__ );
1823                                 $status->fatal( 'edit-already-exists' );
1824
1825                                 wfProfileOut( __METHOD__ );
1826                                 return $status;
1827                         }
1828
1829                         # Save the revision text...
1830                         $revision = new Revision( array(
1831                                 'page'       => $newid,
1832                                 'comment'    => $summary,
1833                                 'minor_edit' => $isminor,
1834                                 'text'       => $serialized,
1835                                 'len'        => $newsize,
1836                                 'user'       => $user->getId(),
1837                                 'user_text'  => $user->getName(),
1838                                 'timestamp'  => $now,
1839                                 'content_model' => $content->getModel(),
1840                                 'content_format' => $serialisation_format,
1841                         ) );
1842                         $revisionId = $revision->insertOn( $dbw );
1843
1844                         # Bug 37225: use accessor to get the text as Revision may trim it
1845                         $content = $revision->getContent(); // sanity; get normalized version
1846
1847                         # Update the page record with revision data
1848                         $this->updateRevisionOn( $dbw, $revision, 0 );
1849
1850                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1851
1852                         # Update recentchanges
1853                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1854                                 # Mark as patrolled if the user can do so
1855                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1856                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1857                                 # Add RC row to the DB
1858                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1859                                         '', $content->getSize(), $revisionId, $patrolled );
1860
1861                                 # Log auto-patrolled edits
1862                                 if ( $patrolled ) {
1863                                         PatrolLog::record( $rc, true, $user );
1864                                 }
1865                         }
1866                         $user->incEditCount();
1867                         $dbw->commit( __METHOD__ );
1868
1869                         # Update links, etc.
1870                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1871
1872                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$user, $serialized, $summary,
1873                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1874
1875                         wfRunHooks( 'ArticleContentInsertComplete', array( &$this, &$user, $content, $summary,
1876                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ) );
1877                 }
1878
1879                 # Do updates right now unless deferral was requested
1880                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1881                         DeferredUpdates::doUpdates();
1882                 }
1883
1884                 // Return the new revision (or null) to the caller
1885                 $status->value['revision'] = $revision;
1886
1887                 wfRunHooks( 'ArticleSaveComplete', array( &$this, &$user, $serialized, $summary,
1888                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1889
1890                 wfRunHooks( 'ArticleContentSaveComplete', array( &$this, &$user, $content, $summary,
1891                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId ) );
1892
1893                 # Promote user to any groups they meet the criteria for
1894                 $user->addAutopromoteOnceGroups( 'onEdit' );
1895
1896                 wfProfileOut( __METHOD__ );
1897                 return $status;
1898         }
1899
1900         /**
1901          * Get parser options suitable for rendering the primary article wikitext
1902          * @param User|string $user User object or 'canonical'
1903          * @return ParserOptions
1904          */
1905         public function makeParserOptions( $user ) {
1906                 global $wgContLang;
1907                 if ( $user instanceof User ) { // settings per user (even anons)
1908                         $options = ParserOptions::newFromUser( $user );
1909                 } else { // canonical settings
1910                         $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
1911                 }
1912                 $options->enableLimitReport(); // show inclusion/loop reports
1913                 $options->setTidy( true ); // fix bad HTML
1914                 return $options;
1915         }
1916
1917         /**
1918          * Prepare text which is about to be saved.
1919          * Returns a stdclass with source, pst and output members
1920          *
1921          * @deprecated in 1.WD: use prepareContentForEdit instead.
1922          */
1923         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1924                 wfDeprecated( __METHOD__, '1.WD' );
1925                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1926                 return $this->prepareContentForEdit( $content, $revid , $user );
1927         }
1928
1929         /**
1930          * Prepare content which is about to be saved.
1931          * Returns a stdclass with source, pst and output members
1932          *
1933          * @param \Content $content
1934          * @param null $revid
1935          * @param null|\User $user
1936          * @param null $serialization_format
1937          *
1938          * @return bool|object
1939          *
1940          * @since 1.WD
1941          */
1942         public function prepareContentForEdit( Content $content, $revid = null, User $user = null, $serialization_format = null ) {
1943                 global $wgParser, $wgContLang, $wgUser;
1944                 $user = is_null( $user ) ? $wgUser : $user;
1945                 // @TODO fixme: check $user->getId() here???
1946
1947                 if ( $this->mPreparedEdit
1948                         && $this->mPreparedEdit->newContent
1949                         && $this->mPreparedEdit->newContent->equals( $content )
1950                         && $this->mPreparedEdit->revid == $revid
1951                         && $this->mPreparedEdit->format == $serialization_format
1952                         #XXX: also check $user here?
1953                 ) {
1954                         // Already prepared
1955                         return $this->mPreparedEdit;
1956                 }
1957
1958                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
1959                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
1960
1961                 $edit = (object)array();
1962                 $edit->revid = $revid;
1963
1964                 $edit->pstContent = $content->preSaveTransform( $this->mTitle, $user, $popts );
1965                 $edit->pst = $edit->pstContent->serialize( $serialization_format ); #XXX: do we need this??
1966                 $edit->format = $serialization_format;
1967
1968                 $edit->popts = $this->makeParserOptions( 'canonical' );
1969
1970                 $edit->output = $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts );
1971
1972                 $edit->newContent = $content;
1973                 $edit->oldContent = $this->getContent( Revision::RAW );
1974
1975                 #NOTE: B/C for hooks! don't use these fields!
1976                 $edit->newText = ContentHandler::getContentText( $edit->newContent );
1977                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
1978
1979                 $this->mPreparedEdit = $edit;
1980
1981                 return $edit;
1982         }
1983
1984         /**
1985          * Do standard deferred updates after page edit.
1986          * Update links tables, site stats, search index and message cache.
1987          * Purges pages that include this page if the text was changed here.
1988          * Every 100th edit, prune the recent changes table.
1989          *
1990          * @param $revision Revision object
1991          * @param $user User object that did the revision
1992          * @param $options Array of options, following indexes are used:
1993          * - changed: boolean, whether the revision changed the content (default true)
1994          * - created: boolean, whether the revision created the page (default false)
1995          * - oldcountable: boolean or null (default null):
1996          *   - boolean: whether the page was counted as an article before that
1997          *     revision, only used in changed is true and created is false
1998          *   - null: don't change the article count
1999          */
2000         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2001                 global $wgEnableParserCache;
2002
2003                 wfProfileIn( __METHOD__ );
2004
2005                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2006                 $content = $revision->getContent();
2007
2008                 # Parse the text
2009                 # Be careful not to double-PST: $text is usually already PST-ed once
2010                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2011                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2012                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
2013                 } else {
2014                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2015                         $editInfo = $this->mPreparedEdit;
2016                 }
2017
2018                 # Save it to the parser cache
2019                 if ( $wgEnableParserCache ) {
2020                         $parserCache = ParserCache::singleton();
2021                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2022                 }
2023
2024                 # Update the links tables and other secondary data
2025                 $updates = $content->getSecondaryDataUpdates( $this->getTitle(), null, true, $editInfo->output );
2026                 DataUpdate::runUpdates( $updates );
2027
2028                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2029
2030                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2031                         if ( 0 == mt_rand( 0, 99 ) ) {
2032                                 // Flush old entries from the `recentchanges` table; we do this on
2033                                 // random requests so as to avoid an increase in writes for no good reason
2034                                 global $wgRCMaxAge;
2035
2036                                 $dbw = wfGetDB( DB_MASTER );
2037                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2038                                 $dbw->delete(
2039                                         'recentchanges',
2040                                         array( "rc_timestamp < '$cutoff'" ),
2041                                         __METHOD__
2042                                 );
2043                         }
2044                 }
2045
2046                 if ( !$this->mTitle->exists() ) {
2047                         wfProfileOut( __METHOD__ );
2048                         return;
2049                 }
2050
2051                 $id = $this->getId();
2052                 $title = $this->mTitle->getPrefixedDBkey();
2053                 $shortTitle = $this->mTitle->getDBkey();
2054
2055                 if ( !$options['changed'] ) {
2056                         $good = 0;
2057                         $total = 0;
2058                 } elseif ( $options['created'] ) {
2059                         $good = (int)$this->isCountable( $editInfo );
2060                         $total = 1;
2061                 } elseif ( $options['oldcountable'] !== null ) {
2062                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2063                         $total = 0;
2064                 } else {
2065                         $good = 0;
2066                         $total = 0;
2067                 }
2068
2069                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2070                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content->getTextForSearchIndex() ) );
2071                 #@TODO: let the search engine decide what to do with the content object
2072
2073                 # If this is another user's talk page, update newtalk.
2074                 # Don't do this if $options['changed'] = false (null-edits) nor if
2075                 # it's a minor edit and the user doesn't want notifications for those.
2076                 if ( $options['changed']
2077                         && $this->mTitle->getNamespace() == NS_USER_TALK
2078                         && $shortTitle != $user->getTitleKey()
2079                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2080                 ) {
2081                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2082                                 $other = User::newFromName( $shortTitle, false );
2083                                 if ( !$other ) {
2084                                         wfDebug( __METHOD__ . ": invalid username\n" );
2085                                 } elseif ( User::isIP( $shortTitle ) ) {
2086                                         // An anonymous user
2087                                         $other->setNewtalk( true, $revision );
2088                                 } elseif ( $other->isLoggedIn() ) {
2089                                         $other->setNewtalk( true, $revision );
2090                                 } else {
2091                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2092                                 }
2093                         }
2094                 }
2095
2096                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2097                         #XXX: could skip pseudo-messages like js/css here, based on content model.
2098                         $msgtext = $content->getWikitextForTransclusion();
2099                         if ( $msgtext === false || $msgtext === null ) $msgtext = '';
2100
2101                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2102                 }
2103
2104                 if( $options['created'] ) {
2105                         self::onArticleCreate( $this->mTitle );
2106                 } else {
2107                         self::onArticleEdit( $this->mTitle );
2108                 }
2109
2110                 wfProfileOut( __METHOD__ );
2111         }
2112
2113         /**
2114          * Edit an article without doing all that other stuff
2115          * The article must already exist; link tables etc
2116          * are not updated, caches are not flushed.
2117          *
2118          * @param $text String: text submitted
2119          * @param $user User The relevant user
2120          * @param $comment String: comment submitted
2121          * @param $minor Boolean: whereas it's a minor modification
2122          *
2123          * @deprecated since 1.WD, use doEditContent() instead.
2124          */
2125         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2126                 wfDeprecated( __METHOD__, "1.WD" );
2127
2128                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2129                 return $this->doQuickEditContent( $content, $user, $comment , $minor );
2130         }
2131
2132         /**
2133          * Edit an article without doing all that other stuff
2134          * The article must already exist; link tables etc
2135          * are not updated, caches are not flushed.
2136          *
2137          * @param $content Content: content submitted
2138          * @param $user User The relevant user
2139          * @param $comment String: comment submitted
2140          * @param $serialisation_format String: format for storing the content in the database
2141          * @param $minor Boolean: whereas it's a minor modification
2142          */
2143         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = 0, $serialisation_format = null ) {
2144                 wfProfileIn( __METHOD__ );
2145
2146                 $serialized = $content->serialize( $serialisation_format );
2147
2148                 $dbw = wfGetDB( DB_MASTER );
2149                 $revision = new Revision( array(
2150                         'page'       => $this->getId(),
2151                         'text'       => $serialized,
2152                         'length'     => $content->getSize(),
2153                         'comment'    => $comment,
2154                         'minor_edit' => $minor ? 1 : 0,
2155                 ) ); #XXX: set the content object?
2156                 $revision->insertOn( $dbw );
2157                 $this->updateRevisionOn( $dbw, $revision );
2158
2159                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2160
2161                 wfProfileOut( __METHOD__ );
2162         }
2163
2164         /**
2165          * Update the article's restriction field, and leave a log entry.
2166          * This works for protection both existing and non-existing pages.
2167          *
2168          * @param $limit Array: set of restriction keys
2169          * @param $reason String
2170          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2171          * @param $expiry Array: per restriction type expiration
2172          * @param $user User The user updating the restrictions
2173          * @return Status
2174          */
2175         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
2176                 global $wgContLang;
2177
2178                 if ( wfReadOnly() ) {
2179                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2180                 }
2181
2182                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2183
2184                 $id = $this->mTitle->getArticleID();
2185
2186                 if ( !$cascade ) {
2187                         $cascade = false;
2188                 }
2189
2190                 // Take this opportunity to purge out expired restrictions
2191                 Title::purgeExpiredRestrictions();
2192
2193                 # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2194                 # we expect a single selection, but the schema allows otherwise.
2195                 $isProtected = false;
2196                 $protect = false;
2197                 $changed = false;
2198
2199                 $dbw = wfGetDB( DB_MASTER );
2200
2201                 foreach ( $restrictionTypes as $action ) {
2202                         if ( !isset( $expiry[$action] ) ) {
2203                                 $expiry[$action] = $dbw->getInfinity();
2204                         }
2205                         if ( !isset( $limit[$action] ) ) {
2206                                 $limit[$action] = '';
2207                         } elseif ( $limit[$action] != '' ) {
2208                                 $protect = true;
2209                         }
2210
2211                         # Get current restrictions on $action
2212                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2213                         if ( $current != '' ) {
2214                                 $isProtected = true;
2215                         }
2216
2217                         if ( $limit[$action] != $current ) {
2218                                 $changed = true;
2219                         } elseif ( $limit[$action] != '' ) {
2220                                 # Only check expiry change if the action is actually being
2221                                 # protected, since expiry does nothing on an not-protected
2222                                 # action.
2223                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2224                                         $changed = true;
2225                                 }
2226                         }
2227                 }
2228
2229                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2230                         $changed = true;
2231                 }
2232
2233                 # If nothing's changed, do nothing
2234                 if ( !$changed ) {
2235                         return Status::newGood();
2236                 }
2237
2238                 if ( !$protect ) { # No protection at all means unprotection
2239                         $revCommentMsg = 'unprotectedarticle';
2240                         $logAction = 'unprotect';
2241                 } elseif ( $isProtected ) {
2242                         $revCommentMsg = 'modifiedarticleprotection';
2243                         $logAction = 'modify';
2244                 } else {
2245                         $revCommentMsg = 'protectedarticle';
2246                         $logAction = 'protect';
2247                 }
2248
2249                 $encodedExpiry = array();
2250                 $protectDescription = '';
2251                 foreach ( $limit as $action => $restrictions ) {
2252                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
2253                         if ( $restrictions != '' ) {
2254                                 $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
2255                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2256                                         $protectDescription .= wfMsgForContent( 'protect-expiring',
2257                                                 $wgContLang->timeanddate( $expiry[$action], false, false ) ,
2258                                                 $wgContLang->date( $expiry[$action], false, false ) ,
2259                                                 $wgContLang->time( $expiry[$action], false, false ) );
2260                                 } else {
2261                                         $protectDescription .= wfMsgForContent( 'protect-expiry-indefinite' );
2262                                 }
2263
2264                                 $protectDescription .= ') ';
2265                         }
2266                 }
2267                 $protectDescription = trim( $protectDescription );
2268
2269                 if ( $id ) { # Protection of existing page
2270                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2271                                 return Status::newGood();
2272                         }
2273
2274                         # Only restrictions with the 'protect' right can cascade...
2275                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
2276                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2277
2278                         # The schema allows multiple restrictions
2279                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2280                                 $cascade = false;
2281                         }
2282
2283                         # Update restrictions table
2284                         foreach ( $limit as $action => $restrictions ) {
2285                                 if ( $restrictions != '' ) {
2286                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2287                                                 array( 'pr_page' => $id,
2288                                                         'pr_type' => $action,
2289                                                         'pr_level' => $restrictions,
2290                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2291                                                         'pr_expiry' => $encodedExpiry[$action]
2292                                                 ),
2293                                                 __METHOD__
2294                                         );
2295                                 } else {
2296                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2297                                                 'pr_type' => $action ), __METHOD__ );
2298                                 }
2299                         }
2300
2301                         # Prepare a null revision to be added to the history
2302                         $editComment = $wgContLang->ucfirst( wfMsgForContent( $revCommentMsg, $this->mTitle->getPrefixedText() ) );
2303                         if ( $reason ) {
2304                                 $editComment .= ": $reason";
2305                         }
2306                         if ( $protectDescription ) {
2307                                 $editComment .= " ($protectDescription)";
2308                         }
2309                         if ( $cascade ) {
2310                                 $editComment .= ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
2311                         }
2312
2313                         # Insert a null revision
2314                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2315                         $nullRevId = $nullRevision->insertOn( $dbw );
2316
2317                         $latest = $this->getLatest();
2318                         # Update page record
2319                         $dbw->update( 'page',
2320                                 array( /* SET */
2321                                         'page_touched' => $dbw->timestamp(),
2322                                         'page_restrictions' => '',
2323                                         'page_latest' => $nullRevId
2324                                 ), array( /* WHERE */
2325                                         'page_id' => $id
2326                                 ), __METHOD__
2327                         );
2328
2329                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2330                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2331                 } else { # Protection of non-existing page (also known as "title protection")
2332                         # Cascade protection is meaningless in this case
2333                         $cascade = false;
2334
2335                         if ( $limit['create'] != '' ) {
2336                                 $dbw->replace( 'protected_titles',
2337                                         array( array( 'pt_namespace', 'pt_title' ) ),
2338                                         array(
2339                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2340                                                 'pt_title' => $this->mTitle->getDBkey(),
2341                                                 'pt_create_perm' => $limit['create'],
2342                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
2343                                                 'pt_expiry' => $encodedExpiry['create'],
2344                                                 'pt_user' => $user->getId(),
2345                                                 'pt_reason' => $reason,
2346                                         ), __METHOD__
2347                                 );
2348                         } else {
2349                                 $dbw->delete( 'protected_titles',
2350                                         array(
2351                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2352                                                 'pt_title' => $this->mTitle->getDBkey()
2353                                         ), __METHOD__
2354                                 );
2355                         }
2356                 }
2357
2358                 $this->mTitle->flushRestrictions();
2359
2360                 if ( $logAction == 'unprotect' ) {
2361                         $logParams = array();
2362                 } else {
2363                         $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
2364                 }
2365
2366                 # Update the protection log
2367                 $log = new LogPage( 'protect' );
2368                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
2369
2370                 return Status::newGood();
2371         }
2372
2373         /**
2374          * Take an array of page restrictions and flatten it to a string
2375          * suitable for insertion into the page_restrictions field.
2376          * @param $limit Array
2377          * @return String
2378          */
2379         protected static function flattenRestrictions( $limit ) {
2380                 if ( !is_array( $limit ) ) {
2381                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2382                 }
2383
2384                 $bits = array();
2385                 ksort( $limit );
2386
2387                 foreach ( $limit as $action => $restrictions ) {
2388                         if ( $restrictions != '' ) {
2389                                 $bits[] = "$action=$restrictions";
2390                         }
2391                 }
2392
2393                 return implode( ':', $bits );
2394         }
2395
2396         /**
2397          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2398          * backwards compatibility, if you care about error reporting you should use
2399          * doDeleteArticleReal() instead.
2400          *
2401          * Deletes the article with database consistency, writes logs, purges caches
2402          *
2403          * @param $reason string delete reason for deletion log
2404          * @param $suppress boolean suppress all revisions and log the deletion in
2405          *        the suppression log instead of the deletion log
2406          * @param $id int article ID
2407          * @param $commit boolean defaults to true, triggers transaction end
2408          * @param &$error Array of errors to append to
2409          * @param $user User The deleting user
2410          * @return boolean true if successful
2411          */
2412         public function doDeleteArticle(
2413                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2414         ) {
2415                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2416                 return $status->isGood();
2417         }
2418
2419         /**
2420          * Back-end article deletion
2421          * Deletes the article with database consistency, writes logs, purges caches
2422          *
2423          * @since 1.19
2424          *
2425          * @param $reason string delete reason for deletion log
2426          * @param $suppress boolean suppress all revisions and log the deletion in
2427          *        the suppression log instead of the deletion log
2428          * @param $commit boolean defaults to true, triggers transaction end
2429          * @param &$error Array of errors to append to
2430          * @param $user User The deleting user
2431          * @return Status: Status object; if successful, $status->value is the log_id of the
2432          *                 deletion log entry. If the page couldn't be deleted because it wasn't
2433          *                 found, $status is a non-fatal 'cannotdelete' error
2434          */
2435         public function doDeleteArticleReal(
2436                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2437         ) {
2438                 global $wgUser, $wgContentHandlerUseDB;
2439
2440                 wfDebug( __METHOD__ . "\n" );
2441
2442                 $status = Status::newGood();
2443
2444                 if ( $this->mTitle->getDBkey() === '' ) {
2445                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2446                         return $status;
2447                 }
2448
2449                 $user = is_null( $user ) ? $wgUser : $user;
2450                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2451                         if ( $status->isOK() ) {
2452                                 // Hook aborted but didn't set a fatal status
2453                                 $status->fatal( 'delete-hook-aborted' );
2454                         }
2455                         return $status;
2456                 }
2457
2458                 if ( $id == 0 ) {
2459                         $this->loadPageData( 'forupdate' );
2460                         $id = $this->getID();
2461                         if ( $id == 0 ) {
2462                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2463                                 return $status;
2464                         }
2465                 }
2466
2467                 // Bitfields to further suppress the content
2468                 if ( $suppress ) {
2469                         $bitfield = 0;
2470                         // This should be 15...
2471                         $bitfield |= Revision::DELETED_TEXT;
2472                         $bitfield |= Revision::DELETED_COMMENT;
2473                         $bitfield |= Revision::DELETED_USER;
2474                         $bitfield |= Revision::DELETED_RESTRICTED;
2475                 } else {
2476                         $bitfield = 'rev_deleted';
2477                 }
2478
2479                 // we need to remember the old content so we can use it to generate all deletion updates.
2480                 $content = $this->getContent( Revision::RAW );
2481
2482                 $dbw = wfGetDB( DB_MASTER );
2483                 $dbw->begin( __METHOD__ );
2484                 // For now, shunt the revision data into the archive table.
2485                 // Text is *not* removed from the text table; bulk storage
2486                 // is left intact to avoid breaking block-compression or
2487                 // immutable storage schemes.
2488                 //
2489                 // For backwards compatibility, note that some older archive
2490                 // table entries will have ar_text and ar_flags fields still.
2491                 //
2492                 // In the future, we may keep revisions and mark them with
2493                 // the rev_deleted field, which is reserved for this purpose.
2494
2495                 $row = array(
2496                         'ar_namespace'  => 'page_namespace',
2497                         'ar_title'      => 'page_title',
2498                         'ar_comment'    => 'rev_comment',
2499                         'ar_user'       => 'rev_user',
2500                         'ar_user_text'  => 'rev_user_text',
2501                         'ar_timestamp'  => 'rev_timestamp',
2502                         'ar_minor_edit' => 'rev_minor_edit',
2503                         'ar_rev_id'     => 'rev_id',
2504                         'ar_parent_id'  => 'rev_parent_id',
2505                         'ar_text_id'    => 'rev_text_id',
2506                         'ar_text'       => '\'\'', // Be explicit to appease
2507                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2508                         'ar_len'        => 'rev_len',
2509                         'ar_page_id'    => 'page_id',
2510                         'ar_deleted'    => $bitfield,
2511                         'ar_sha1'       => 'rev_sha1',
2512                 );
2513
2514                 if ( $wgContentHandlerUseDB ) {
2515                         $row[ 'ar_content_model' ] = 'rev_content_model';
2516                         $row[ 'ar_content_format' ] = 'rev_content_format';
2517                 }
2518
2519                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2520                         $row,
2521                         array(
2522                                 'page_id' => $id,
2523                                 'page_id = rev_page'
2524                         ), __METHOD__
2525                 );
2526
2527                 # Now that it's safely backed up, delete it
2528                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2529                 $ok = ( $dbw->affectedRows() > 0 ); // getArticleID() uses slave, could be laggy
2530
2531                 if ( !$ok ) {
2532                         $dbw->rollback( __METHOD__ );
2533                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2534                         return $status;
2535                 }
2536
2537                 $this->doDeleteUpdates( $id, $content );
2538
2539                 # Log the deletion, if the page was suppressed, log it at Oversight instead
2540                 $logtype = $suppress ? 'suppress' : 'delete';
2541
2542                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2543                 $logEntry->setPerformer( $user );
2544                 $logEntry->setTarget( $this->mTitle );
2545                 $logEntry->setComment( $reason );
2546                 $logid = $logEntry->insert();
2547                 $logEntry->publish( $logid );
2548
2549                 if ( $commit ) {
2550                         $dbw->commit( __METHOD__ );
2551                 }
2552
2553                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id ) );
2554                 $status->value = $logid;
2555                 return $status;
2556         }
2557
2558         /**
2559          * Do some database updates after deletion
2560          *
2561          * @param $id Int: page_id value of the page being deleted (B/C, currently unused)
2562          * @param $content Content: optional page content to be used when determining the required updates.
2563          *        This may be needed because $this->getContent() may already return null when the page proper was deleted.
2564          */
2565         public function doDeleteUpdates( $id, Content $content = null ) {
2566                 # update site status
2567                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2568
2569                 # remove secondary indexes, etc
2570                 $updates = $this->getDeletionUpdates( $content );
2571                 DataUpdate::runUpdates( $updates );
2572
2573                 # Clear caches
2574                 WikiPage::onArticleDelete( $this->mTitle );
2575
2576                 # Reset this object
2577                 $this->clear();
2578
2579                 # Clear the cached article id so the interface doesn't act like we exist
2580                 $this->mTitle->resetArticleID( 0 );
2581         }
2582
2583         /**
2584          * Roll back the most recent consecutive set of edits to a page
2585          * from the same user; fails if there are no eligible edits to
2586          * roll back to, e.g. user is the sole contributor. This function
2587          * performs permissions checks on $user, then calls commitRollback()
2588          * to do the dirty work
2589          *
2590          * @todo: seperate the business/permission stuff out from backend code
2591          *
2592          * @param $fromP String: Name of the user whose edits to rollback.
2593          * @param $summary String: Custom summary. Set to default summary if empty.
2594          * @param $token String: Rollback token.
2595          * @param $bot Boolean: If true, mark all reverted edits as bot.
2596          *
2597          * @param $resultDetails Array: contains result-specific array of additional values
2598          *    'alreadyrolled' : 'current' (rev)
2599          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2600          *
2601          * @param $user User The user performing the rollback
2602          * @return array of errors, each error formatted as
2603          *   array(messagekey, param1, param2, ...).
2604          * On success, the array is empty.  This array can also be passed to
2605          * OutputPage::showPermissionsErrorPage().
2606          */
2607         public function doRollback(
2608                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2609         ) {
2610                 $resultDetails = null;
2611
2612                 # Check permissions
2613                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2614                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2615                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2616
2617                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2618                         $errors[] = array( 'sessionfailure' );
2619                 }
2620
2621                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2622                         $errors[] = array( 'actionthrottledtext' );
2623                 }
2624
2625                 # If there were errors, bail out now
2626                 if ( !empty( $errors ) ) {
2627                         return $errors;
2628                 }
2629
2630                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2631         }
2632
2633         /**
2634          * Backend implementation of doRollback(), please refer there for parameter
2635          * and return value documentation
2636          *
2637          * NOTE: This function does NOT check ANY permissions, it just commits the
2638          * rollback to the DB. Therefore, you should only call this function direct-
2639          * ly if you want to use custom permissions checks. If you don't, use
2640          * doRollback() instead.
2641          * @param $fromP String: Name of the user whose edits to rollback.
2642          * @param $summary String: Custom summary. Set to default summary if empty.
2643          * @param $bot Boolean: If true, mark all reverted edits as bot.
2644          *
2645          * @param $resultDetails Array: contains result-specific array of additional values
2646          * @param $guser User The user performing the rollback
2647          * @return array
2648          */
2649         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2650                 global $wgUseRCPatrol, $wgContLang;
2651
2652                 $dbw = wfGetDB( DB_MASTER );
2653
2654                 if ( wfReadOnly() ) {
2655                         return array( array( 'readonlytext' ) );
2656                 }
2657
2658                 # Get the last editor
2659                 $current = $this->getRevision();
2660                 if ( is_null( $current ) ) {
2661                         # Something wrong... no page?
2662                         return array( array( 'notanarticle' ) );
2663                 }
2664
2665                 $from = str_replace( '_', ' ', $fromP );
2666                 # User name given should match up with the top revision.
2667                 # If the user was deleted then $from should be empty.
2668                 if ( $from != $current->getUserText() ) {
2669                         $resultDetails = array( 'current' => $current );
2670                         return array( array( 'alreadyrolled',
2671                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2672                                 htmlspecialchars( $fromP ),
2673                                 htmlspecialchars( $current->getUserText() )
2674                         ) );
2675                 }
2676
2677                 # Get the last edit not by this guy...
2678                 # Note: these may not be public values
2679                 $user = intval( $current->getRawUser() );
2680                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2681                 $s = $dbw->selectRow( 'revision',
2682                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2683                         array( 'rev_page' => $current->getPage(),
2684                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2685                         ), __METHOD__,
2686                         array( 'USE INDEX' => 'page_timestamp',
2687                                 'ORDER BY' => 'rev_timestamp DESC' )
2688                         );
2689                 if ( $s === false ) {
2690                         # No one else ever edited this page
2691                         return array( array( 'cantrollback' ) );
2692                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2693                         # Only admins can see this text
2694                         return array( array( 'notvisiblerev' ) );
2695                 }
2696
2697                 $set = array();
2698                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2699                         # Mark all reverted edits as bot
2700                         $set['rc_bot'] = 1;
2701                 }
2702
2703                 if ( $wgUseRCPatrol ) {
2704                         # Mark all reverted edits as patrolled
2705                         $set['rc_patrolled'] = 1;
2706                 }
2707
2708                 if ( count( $set ) ) {
2709                         $dbw->update( 'recentchanges', $set,
2710                                 array( /* WHERE */
2711                                         'rc_cur_id' => $current->getPage(),
2712                                         'rc_user_text' => $current->getUserText(),
2713                                         "rc_timestamp > '{$s->rev_timestamp}'",
2714                                 ), __METHOD__
2715                         );
2716                 }
2717
2718                 # Generate the edit summary if necessary
2719                 $target = Revision::newFromId( $s->rev_id );
2720                 if ( empty( $summary ) ) {
2721                         if ( $from == '' ) { // no public user name
2722                                 $summary = wfMsgForContent( 'revertpage-nouser' );
2723                         } else {
2724                                 $summary = wfMsgForContent( 'revertpage' );
2725                         }
2726                 }
2727
2728                 # Allow the custom summary to use the same args as the default message
2729                 $args = array(
2730                         $target->getUserText(), $from, $s->rev_id,
2731                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2732                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2733                 );
2734                 $summary = wfMsgReplaceArgs( $summary, $args );
2735
2736                 # Save
2737                 $flags = EDIT_UPDATE;
2738
2739                 if ( $guser->isAllowed( 'minoredit' ) ) {
2740                         $flags |= EDIT_MINOR;
2741                 }
2742
2743                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2744                         $flags |= EDIT_FORCE_BOT;
2745                 }
2746
2747                 # Actually store the edit
2748                 $status = $this->doEditContent( $target->getContent(), $summary, $flags, $target->getId(), $guser );
2749
2750                 if ( !$status->isOK() ) {
2751                         return $status->getErrorsArray();
2752                 }
2753
2754                 if ( !empty( $status->value['revision'] ) ) {
2755                         $revId = $status->value['revision']->getId();
2756                 } else {
2757                         $revId = false;
2758                 }
2759
2760                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2761
2762                 $resultDetails = array(
2763                         'summary' => $summary,
2764                         'current' => $current,
2765                         'target'  => $target,
2766                         'newid'   => $revId
2767                 );
2768
2769                 return array();
2770         }
2771
2772         /**
2773          * The onArticle*() functions are supposed to be a kind of hooks
2774          * which should be called whenever any of the specified actions
2775          * are done.
2776          *
2777          * This is a good place to put code to clear caches, for instance.
2778          *
2779          * This is called on page move and undelete, as well as edit
2780          *
2781          * @param $title Title object
2782          */
2783         public static function onArticleCreate( $title ) {
2784                 # Update existence markers on article/talk tabs...
2785                 if ( $title->isTalkPage() ) {
2786                         $other = $title->getSubjectPage();
2787                 } else {
2788                         $other = $title->getTalkPage();
2789                 }
2790
2791                 $other->invalidateCache();
2792                 $other->purgeSquid();
2793
2794                 $title->touchLinks();
2795                 $title->purgeSquid();
2796                 $title->deleteTitleProtection();
2797         }
2798
2799         /**
2800          * Clears caches when article is deleted
2801          *
2802          * @param $title Title
2803          */
2804         public static function onArticleDelete( $title ) {
2805                 # Update existence markers on article/talk tabs...
2806                 if ( $title->isTalkPage() ) {
2807                         $other = $title->getSubjectPage();
2808                 } else {
2809                         $other = $title->getTalkPage();
2810                 }
2811
2812                 $other->invalidateCache();
2813                 $other->purgeSquid();
2814
2815                 $title->touchLinks();
2816                 $title->purgeSquid();
2817
2818                 # File cache
2819                 HTMLFileCache::clearFileCache( $title );
2820
2821                 # Messages
2822                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2823                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2824                 }
2825
2826                 # Images
2827                 if ( $title->getNamespace() == NS_FILE ) {
2828                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2829                         $update->doUpdate();
2830                 }
2831
2832                 # User talk pages
2833                 if ( $title->getNamespace() == NS_USER_TALK ) {
2834                         $user = User::newFromName( $title->getText(), false );
2835                         if ( $user ) {
2836                                 $user->setNewtalk( false );
2837                         }
2838                 }
2839
2840                 # Image redirects
2841                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2842         }
2843
2844         /**
2845          * Purge caches on page update etc
2846          *
2847          * @param $title Title object
2848          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2849          */
2850         public static function onArticleEdit( $title ) {
2851                 // Invalidate caches of articles which include this page
2852                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2853
2854
2855                 // Invalidate the caches of all pages which redirect here
2856                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2857
2858                 # Purge squid for this page only
2859                 $title->purgeSquid();
2860
2861                 # Clear file cache for this page only
2862                 HTMLFileCache::clearFileCache( $title );
2863         }
2864
2865         /**#@-*/
2866
2867         /**
2868          * Returns a list of hidden categories this page is a member of.
2869          * Uses the page_props and categorylinks tables.
2870          *
2871          * @return Array of Title objects
2872          */
2873         public function getHiddenCategories() {
2874                 $result = array();
2875                 $id = $this->mTitle->getArticleID();
2876
2877                 if ( $id == 0 ) {
2878                         return array();
2879                 }
2880
2881                 $dbr = wfGetDB( DB_SLAVE );
2882                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2883                         array( 'cl_to' ),
2884                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2885                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2886                         __METHOD__ );
2887
2888                 if ( $res !== false ) {
2889                         foreach ( $res as $row ) {
2890                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2891                         }
2892                 }
2893
2894                 return $result;
2895         }
2896
2897         /**
2898         * Return an applicable autosummary if one exists for the given edit.
2899         * @param $oldtext String|null: the previous text of the page.
2900         * @param $newtext String|null: The submitted text of the page.
2901         * @param $flags Int bitmask: a bitmask of flags submitted for the edit.
2902         * @return string An appropriate autosummary, or an empty string.
2903         *
2904         * @deprecated since 1.WD, use ContentHandler::getAutosummary() instead
2905         */
2906         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2907                 # NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
2908
2909                 wfDeprecated( __METHOD__, '1.WD' );
2910
2911                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
2912                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
2913                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
2914
2915                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
2916         }
2917
2918         /**
2919          * Auto-generates a deletion reason
2920          *
2921          * @param &$hasHistory Boolean: whether the page has a history
2922          * @return mixed String containing deletion reason or empty string, or boolean false
2923          *    if no revision occurred
2924          */
2925         public function getAutoDeleteReason( &$hasHistory ) {
2926                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
2927         }
2928
2929         /**
2930          * Update all the appropriate counts in the category table, given that
2931          * we've added the categories $added and deleted the categories $deleted.
2932          *
2933          * @param $added array   The names of categories that were added
2934          * @param $deleted array The names of categories that were deleted
2935          */
2936         public function updateCategoryCounts( $added, $deleted ) {
2937                 $ns = $this->mTitle->getNamespace();
2938                 $dbw = wfGetDB( DB_MASTER );
2939
2940                 # First make sure the rows exist.  If one of the "deleted" ones didn't
2941                 # exist, we might legitimately not create it, but it's simpler to just
2942                 # create it and then give it a negative value, since the value is bogus
2943                 # anyway.
2944                 #
2945                 # Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
2946                 $insertCats = array_merge( $added, $deleted );
2947                 if ( !$insertCats ) {
2948                         # Okay, nothing to do
2949                         return;
2950                 }
2951
2952                 $insertRows = array();
2953
2954                 foreach ( $insertCats as $cat ) {
2955                         $insertRows[] = array(
2956                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
2957                                 'cat_title' => $cat
2958                         );
2959                 }
2960                 $dbw->insert( 'category', $insertRows, __METHOD__, 'IGNORE' );
2961
2962                 $addFields    = array( 'cat_pages = cat_pages + 1' );
2963                 $removeFields = array( 'cat_pages = cat_pages - 1' );
2964
2965                 if ( $ns == NS_CATEGORY ) {
2966                         $addFields[]    = 'cat_subcats = cat_subcats + 1';
2967                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
2968                 } elseif ( $ns == NS_FILE ) {
2969                         $addFields[]    = 'cat_files = cat_files + 1';
2970                         $removeFields[] = 'cat_files = cat_files - 1';
2971                 }
2972
2973                 if ( $added ) {
2974                         $dbw->update(
2975                                 'category',
2976                                 $addFields,
2977                                 array( 'cat_title' => $added ),
2978                                 __METHOD__
2979                         );
2980                 }
2981
2982                 if ( $deleted ) {
2983                         $dbw->update(
2984                                 'category',
2985                                 $removeFields,
2986                                 array( 'cat_title' => $deleted ),
2987                                 __METHOD__
2988                         );
2989                 }
2990         }
2991
2992         /**
2993          * Updates cascading protections
2994          *
2995          * @param $parserOutput ParserOutput object for the current version
2996          */
2997         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
2998                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
2999                         return;
3000                 }
3001
3002                 // templatelinks table may have become out of sync,
3003                 // especially if using variable-based transclusions.
3004                 // For paranoia, check if things have changed and if
3005                 // so apply updates to the database. This will ensure
3006                 // that cascaded protections apply as soon as the changes
3007                 // are visible.
3008
3009                 # Get templates from templatelinks
3010                 $id = $this->mTitle->getArticleID();
3011
3012                 $tlTemplates = array();
3013
3014                 $dbr = wfGetDB( DB_SLAVE );
3015                 $res = $dbr->select( array( 'templatelinks' ),
3016                         array( 'tl_namespace', 'tl_title' ),
3017                         array( 'tl_from' => $id ),
3018                         __METHOD__
3019                 );
3020
3021                 foreach ( $res as $row ) {
3022                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3023                 }
3024
3025                 # Get templates from parser output.
3026                 $poTemplates = array();
3027                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3028                         foreach ( $templates as $dbk => $id ) {
3029                                 $poTemplates["$ns:$dbk"] = true;
3030                         }
3031                 }
3032
3033                 # Get the diff
3034                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3035
3036                 if ( count( $templates_diff ) > 0 ) {
3037                         # Whee, link updates time.
3038                         # Note: we are only interested in links here. We don't need to get other DataUpdate items from the parser output.
3039                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3040                         $u->doUpdate();
3041                 }
3042         }
3043
3044         /**
3045          * Return a list of templates used by this article.
3046          * Uses the templatelinks table
3047          *
3048          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
3049          * @return Array of Title objects
3050          */
3051         public function getUsedTemplates() {
3052                 return $this->mTitle->getTemplateLinksFrom();
3053         }
3054
3055         /**
3056          * Perform article updates on a special page creation.
3057          *
3058          * @param $rev Revision object
3059          *
3060          * @todo This is a shitty interface function. Kill it and replace the
3061          * other shitty functions like doEditUpdates and such so it's not needed
3062          * anymore.
3063          * @deprecated since 1.18, use doEditUpdates()
3064          */
3065         public function createUpdates( $rev ) {
3066                 wfDeprecated( __METHOD__, '1.18' );
3067                 global $wgUser;
3068                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
3069         }
3070
3071         /**
3072          * This function is called right before saving the wikitext,
3073          * so we can do things like signatures and links-in-context.
3074          *
3075          * @deprecated in 1.19; use Parser::preSaveTransform() instead
3076          * @param $text String article contents
3077          * @param $user User object: user doing the edit
3078          * @param $popts ParserOptions object: parser options, default options for
3079          *               the user loaded if null given
3080          * @return string article contents with altered wikitext markup (signatures
3081          *      converted, {{subst:}}, templates, etc.)
3082          */
3083         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3084                 global $wgParser, $wgUser;
3085
3086                 wfDeprecated( __METHOD__, '1.19' );
3087
3088                 $user = is_null( $user ) ? $wgUser : $user;
3089
3090                 if ( $popts === null ) {
3091                         $popts = ParserOptions::newFromUser( $user );
3092                 }
3093
3094                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3095         }
3096
3097         /**
3098          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
3099          *
3100          * @deprecated in 1.19; use Title::isBigDeletion() instead.
3101          * @return bool
3102          */
3103         public function isBigDeletion() {
3104                 wfDeprecated( __METHOD__, '1.19' );
3105                 return $this->mTitle->isBigDeletion();
3106         }
3107
3108         /**
3109          * Get the  approximate revision count of this page.
3110          *
3111          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
3112          * @return int
3113          */
3114         public function estimateRevisionCount() {
3115                 wfDeprecated( __METHOD__, '1.19' );
3116                 return $this->mTitle->estimateRevisionCount();
3117         }
3118
3119         /**
3120          * Update the article's restriction field, and leave a log entry.
3121          *
3122          * @deprecated since 1.19
3123          * @param $limit Array: set of restriction keys
3124          * @param $reason String
3125          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
3126          * @param $expiry Array: per restriction type expiration
3127          * @param $user User The user updating the restrictions
3128          * @return bool true on success
3129          */
3130         public function updateRestrictions(
3131                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3132         ) {
3133                 global $wgUser;
3134
3135                 $user = is_null( $user ) ? $wgUser : $user;
3136
3137                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3138         }
3139
3140         /**
3141          * @deprecated since 1.18
3142          */
3143         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3144                 wfDeprecated( __METHOD__, '1.18' );
3145                 global $wgUser;
3146                 $this->doQuickEdit( $text, $wgUser, $comment, $minor );
3147         }
3148
3149         /**
3150          * @deprecated since 1.18
3151          */
3152         public function viewUpdates() {
3153                 wfDeprecated( __METHOD__, '1.18' );
3154                 global $wgUser;
3155                 return $this->doViewUpdates( $wgUser );
3156         }
3157
3158         /**
3159          * @deprecated since 1.18
3160          * @return bool
3161          */
3162         public function useParserCache( $oldid ) {
3163                 wfDeprecated( __METHOD__, '1.18' );
3164                 global $wgUser;
3165                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
3166         }
3167
3168         /**
3169          * Returns a list of updates to be performed when this page is deleted. The updates should remove any information
3170          * about this page from secondary data stores such as links tables.
3171          *
3172          * @param Content|null $content optional Content object for determining the necessary updates
3173          * @return Array an array of DataUpdates objects
3174          */
3175         public function getDeletionUpdates( Content $content = null ) {
3176                 if ( !$content ) {
3177                         // load content object, which may be used to determine the necessary updates
3178                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3179                         $content = $this->getContent( Revision::RAW );
3180                 }
3181
3182                 if ( !$content ) {
3183                         $updates = array();
3184                 } else {
3185                         $updates = $content->getDeletionUpdates( $this->mTitle );
3186                 }
3187
3188                 wfRunHooks( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3189                 return $updates;
3190         }
3191
3192 }
3193
3194 class PoolWorkArticleView extends PoolCounterWork {
3195
3196         /**
3197          * @var Page
3198          */
3199         private $page;
3200
3201         /**
3202          * @var string
3203          */
3204         private $cacheKey;
3205
3206         /**
3207          * @var integer
3208          */
3209         private $revid;
3210
3211         /**
3212          * @var ParserOptions
3213          */
3214         private $parserOptions;
3215
3216         /**
3217          * @var Content|null
3218          */
3219         private $content = null;
3220
3221         /**
3222          * @var ParserOutput|bool
3223          */
3224         private $parserOutput = false;
3225
3226         /**
3227          * @var bool
3228          */
3229         private $isDirty = false;
3230
3231         /**
3232          * @var Status|bool
3233          */
3234         private $error = false;
3235
3236         /**
3237          * Constructor
3238          *
3239          * @param $page Page
3240          * @param $revid Integer: ID of the revision being parsed
3241          * @param $useParserCache Boolean: whether to use the parser cache
3242          * @param $parserOptions parserOptions to use for the parse operation
3243          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
3244          */
3245         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null ) {
3246                 if ( is_string($content) ) { #BC: old style call
3247                         $modelId = $page->getRevision()->getContentModel();
3248                         $format = $page->getRevision()->getContentFormat();
3249                         $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelId, $format );
3250                 }
3251
3252                 $this->page = $page;
3253                 $this->revid = $revid;
3254                 $this->cacheable = $useParserCache;
3255                 $this->parserOptions = $parserOptions;
3256                 $this->content = $content;
3257                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3258                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3259         }
3260
3261         /**
3262          * Get the ParserOutput from this object, or false in case of failure
3263          *
3264          * @return ParserOutput
3265          */
3266         public function getParserOutput() {
3267                 return $this->parserOutput;
3268         }
3269
3270         /**
3271          * Get whether the ParserOutput is a dirty one (i.e. expired)
3272          *
3273          * @return bool
3274          */
3275         public function getIsDirty() {
3276                 return $this->isDirty;
3277         }
3278
3279         /**
3280          * Get a Status object in case of error or false otherwise
3281          *
3282          * @return Status|bool
3283          */
3284         public function getError() {
3285                 return $this->error;
3286         }
3287
3288         /**
3289          * @return bool
3290          */
3291         function doWork() {
3292                 global $wgUseFileCache;
3293
3294                 // @todo: several of the methods called on $this->page are not declared in Page, but present
3295                 //        in WikiPage and delegated by Article.
3296
3297                 $isCurrent = $this->revid === $this->page->getLatest();
3298
3299                 if ( $this->content !== null ) {
3300                         $content = $this->content;
3301                 } elseif ( $isCurrent ) {
3302                         #XXX: why use RAW audience here, and PUBLIC (default) below?
3303                         $content = $this->page->getContent( Revision::RAW );
3304                 } else {
3305                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3306                         if ( $rev === null ) {
3307                                 return false;
3308                         }
3309
3310                         #XXX: why use PUBLIC audience here (default), and RAW above?
3311                         $content = $rev->getContent();
3312                 }
3313
3314                 $time = - microtime( true );
3315                 $this->parserOutput = $content->getParserOutput( $this->page->getTitle(), $this->revid, $this->parserOptions );
3316                 $time += microtime( true );
3317
3318                 # Timing hack
3319                 if ( $time > 3 ) {
3320                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3321                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3322                 }
3323
3324                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
3325                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
3326                 }
3327
3328                 // Make sure file cache is not used on uncacheable content.
3329                 // Output that has magic words in it can still use the parser cache
3330                 // (if enabled), though it will generally expire sooner.
3331                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3332                         $wgUseFileCache = false;
3333                 }
3334
3335                 if ( $isCurrent ) {
3336                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3337                 }
3338
3339                 return true;
3340         }
3341
3342         /**
3343          * @return bool
3344          */
3345         function getCachedWork() {
3346                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3347
3348                 if ( $this->parserOutput === false ) {
3349                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3350                         return false;
3351                 } else {
3352                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3353                         return true;
3354                 }
3355         }
3356
3357         /**
3358          * @return bool
3359          */
3360         function fallback() {
3361                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3362
3363                 if ( $this->parserOutput === false ) {
3364                         wfDebugLog( 'dirty', "dirty missing\n" );
3365                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3366                         return false;
3367                 } else {
3368                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3369                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
3370                         $this->isDirty = true;
3371                         return true;
3372                 }
3373         }
3374
3375         /**
3376          * @param $status Status
3377          * @return bool
3378          */
3379         function error( $status ) {
3380                 $this->error = $status;
3381                 return false;
3382         }
3383 }
3384