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 interface 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 implements Page, 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
  55          */
  56         protected $mId = null;
  57
  58         /**
  59          * @var int; one of the READ_* constants
  60          */
  61         protected $mDataLoadedFrom = self::READ_NONE;
  62
  63         /**
  64          * @var Title
  65          */
  66         protected $mRedirectTarget = null;
  67
  68         /**
  69          * @var Revision
  70          */
  71         protected $mLastRevision = null;
  72
  73         /**
  74          * @var string; timestamp of the current revision or empty string if not loaded
  75          */
  76         protected $mTimestamp = '';
  77
  78         /**
  79          * @var string
  80          */
  81         protected $mTouched = '19700101000000';
  82
  83         /**
  84          * @var int|null
  85          */
  86         protected $mCounter = null;
  87
  88         /**
  89          * Constructor and clear the article
  90          * @param $title Title Reference to a Title object.
  91          */
  92         public function __construct( Title $title ) {
  93                 $this->mTitle = $title;
  94         }
  95
  96         /**
  97          * Create a WikiPage object of the appropriate class for the given title.
  98          *
  99          * @param $title Title
 100          * @throws MWException
 101          * @return WikiPage object of the appropriate type
 102          */
 103         public static function factory( Title $title ) {
 104                 $ns = $title->getNamespace();
 105
 106                 if ( $ns == NS_MEDIA ) {
 107                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 108                 } elseif ( $ns < 0 ) {
 109                         throw new MWException( "Invalid or virtual namespace $ns given." );
 110                 }
 111
 112                 switch ( $ns ) {
 113                         case NS_FILE:
 114                                 $page = new WikiFilePage( $title );
 115                                 break;
 116                         case NS_CATEGORY:
 117                                 $page = new WikiCategoryPage( $title );
 118                                 break;
 119                         default:
 120                                 $page = new WikiPage( $title );
 121                 }
 122
 123                 return $page;
 124         }
 125
 126         /**
 127          * Constructor from a page id
 128          *
 129          * @param int $id article ID to load
 130          * @param string|int $from one of the following values:
 131          *        - "fromdb" or WikiPage::READ_NORMAL to select from a slave database
 132          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 133          *
 134          * @return WikiPage|null
 135          */
 136         public static function newFromID( $id, $from = 'fromdb' ) {
 137                 $from = self::convertSelectType( $from );
 138                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_SLAVE );
 139                 $row = $db->selectRow( 'page', self::selectFields(), array( 'page_id' => $id ), __METHOD__ );
 140                 if ( !$row ) {
 141                         return null;
 142                 }
 143                 return self::newFromRow( $row, $from );
 144         }
 145
 146         /**
 147          * Constructor from a database row
 148          *
 149          * @since 1.20
 150          * @param $row object: database row containing at least fields returned
 151          *        by selectFields().
 152          * @param string|int $from source of $data:
 153          *        - "fromdb" or WikiPage::READ_NORMAL: from a slave DB
 154          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 155          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 156          * @return WikiPage
 157          */
 158         public static function newFromRow( $row, $from = 'fromdb' ) {
 159                 $page = self::factory( Title::newFromRow( $row ) );
 160                 $page->loadFromRow( $row, $from );
 161                 return $page;
 162         }
 163
 164         /**
 165          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 166          *
 167          * @param $type object|string|int
 168          * @return mixed
 169          */
 170         private static function convertSelectType( $type ) {
 171                 switch ( $type ) {
 172                 case 'fromdb':
 173                         return self::READ_NORMAL;
 174                 case 'fromdbmaster':
 175                         return self::READ_LATEST;
 176                 case 'forupdate':
 177                         return self::READ_LOCKING;
 178                 default:
 179                         // It may already be an integer or whatever else
 180                         return $type;
 181                 }
 182         }
 183
 184         /**
 185          * Returns overrides for action handlers.
 186          * Classes listed here will be used instead of the default one when
 187          * (and only when) $wgActions[$action] === true. This allows subclasses
 188          * to override the default behavior.
 189          *
 190          * @todo: move this UI stuff somewhere else
 191          *
 192          * @return Array
 193          */
 194         public function getActionOverrides() {
 195                 $content_handler = $this->getContentHandler();
 196                 return $content_handler->getActionOverrides();
 197         }
 198
 199         /**
 200          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 201          *
 202          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 203          *
 204          * @return ContentHandler
 205          *
 206          * @since 1.21
 207          */
 208         public function getContentHandler() {
 209                 return ContentHandler::getForModelID( $this->getContentModel() );
 210         }
 211
 212         /**
 213          * Get the title object of the article
 214          * @return Title object of this page
 215          */
 216         public function getTitle() {
 217                 return $this->mTitle;
 218         }
 219
 220         /**
 221          * Clear the object
 222          * @return void
 223          */
 224         public function clear() {
 225                 $this->mDataLoaded = false;
 226                 $this->mDataLoadedFrom = self::READ_NONE;
 227
 228                 $this->clearCacheFields();
 229         }
 230
 231         /**
 232          * Clear the object cache fields
 233          * @return void
 234          */
 235         protected function clearCacheFields() {
 236                 $this->mId = null;
 237                 $this->mCounter = null;
 238                 $this->mRedirectTarget = null; // Title object if set
 239                 $this->mLastRevision = null; // Latest revision
 240                 $this->mTouched = '19700101000000';
 241                 $this->mTimestamp = '';
 242                 $this->mIsRedirect = false;
 243                 $this->mLatest = false;
 244                 $this->mPreparedEdit = false;
 245         }
 246
 247         /**
 248          * Return the list of revision fields that should be selected to create
 249          * a new page.
 250          *
 251          * @return array
 252          */
 253         public static function selectFields() {
 254                 global $wgContentHandlerUseDB;
 255
 256                 $fields = array(
 257                         'page_id',
 258                         'page_namespace',
 259                         'page_title',
 260                         'page_restrictions',
 261                         'page_counter',
 262                         'page_is_redirect',
 263                         'page_is_new',
 264                         'page_random',
 265                         'page_touched',
 266                         'page_latest',
 267                         'page_len',
 268                 );
 269
 270                 if ( $wgContentHandlerUseDB ) {
 271                         $fields[] = 'page_content_model';
 272                 }
 273
 274                 return $fields;
 275         }
 276
 277         /**
 278          * Fetch a page record with the given conditions
 279          * @param $dbr DatabaseBase object
 280          * @param $conditions Array
 281          * @param $options Array
 282          * @return mixed Database result resource, or false on failure
 283          */
 284         protected function pageData( $dbr, $conditions, $options = array() ) {
 285                 $fields = self::selectFields();
 286
 287                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 288
 289                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 290
 291                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 292
 293                 return $row;
 294         }
 295
 296         /**
 297          * Fetch a page record matching the Title object's namespace and title
 298          * using a sanitized title string
 299          *
 300          * @param $dbr DatabaseBase object
 301          * @param $title Title object
 302          * @param $options Array
 303          * @return mixed Database result resource, or false on failure
 304          */
 305         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 306                 return $this->pageData( $dbr, array(
 307                         'page_namespace' => $title->getNamespace(),
 308                         'page_title'     => $title->getDBkey() ), $options );
 309         }
 310
 311         /**
 312          * Fetch a page record matching the requested ID
 313          *
 314          * @param $dbr DatabaseBase
 315          * @param $id Integer
 316          * @param $options Array
 317          * @return mixed Database result resource, or false on failure
 318          */
 319         public function pageDataFromId( $dbr, $id, $options = array() ) {
 320                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 321         }
 322
 323         /**
 324          * Set the general counter, title etc data loaded from
 325          * some source.
 326          *
 327          * @param $from object|string|int One of the following:
 328          *        - A DB query result object
 329          *        - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB
 330          *        - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB
 331          *        - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB using SELECT FOR UPDATE
 332          *
 333          * @return void
 334          */
 335         public function loadPageData( $from = 'fromdb' ) {
 336                 $from = self::convertSelectType( $from );
 337                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 338                         // We already have the data from the correct location, no need to load it twice.
 339                         return;
 340                 }
 341
 342                 if ( $from === self::READ_LOCKING ) {
 343                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 344                 } elseif ( $from === self::READ_LATEST ) {
 345                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 346                 } elseif ( $from === self::READ_NORMAL ) {
 347                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 348                         // Use a "last rev inserted" timestamp key to diminish the issue of slave lag.
 349                         // Note that DB also stores the master position in the session and checks it.
 350                         $touched = $this->getCachedLastEditTime();
 351                         if ( $touched ) { // key set
 352                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 353                                         $from = self::READ_LATEST;
 354                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 355                                 }
 356                         }
 357                 } else {
 358                         // No idea from where the caller got this data, assume slave database.
 359                         $data = $from;
 360                         $from = self::READ_NORMAL;
 361                 }
 362
 363                 $this->loadFromRow( $data, $from );
 364         }
 365
 366         /**
 367          * Load the object from a database row
 368          *
 369          * @since 1.20
 370          * @param $data object: database row containing at least fields returned
 371          *        by selectFields()
 372          * @param string|int $from One of the following:
 373          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 374          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 375          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from from
 376          *          the master DB using SELECT FOR UPDATE
 377          */
 378         public function loadFromRow( $data, $from ) {
 379                 $lc = LinkCache::singleton();
 380                 $lc->clearLink( $this->mTitle );
 381
 382                 if ( $data ) {
 383                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 384
 385                         $this->mTitle->loadFromRow( $data );
 386
 387                         // Old-fashioned restrictions
 388                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 389
 390                         $this->mId = intval( $data->page_id );
 391                         $this->mCounter = intval( $data->page_counter );
 392                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 393                         $this->mIsRedirect = intval( $data->page_is_redirect );
 394                         $this->mLatest = intval( $data->page_latest );
 395                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 396                         // Double-check the ID of any cached latest Revision object for consistency.
 397                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 398                                 $this->mLastRevision = null;
 399                                 $this->mTimestamp = '';
 400                         }
 401                 } else {
 402                         $lc->addBadLinkObj( $this->mTitle );
 403
 404                         $this->mTitle->loadFromRow( false );
 405
 406                         $this->clearCacheFields();
 407
 408                         $this->mId = 0;
 409                 }
 410
 411                 $this->mDataLoaded = true;
 412                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 413         }
 414
 415         /**
 416          * @return int Page ID
 417          */
 418         public function getId() {
 419                 if ( !$this->mDataLoaded ) {
 420                         $this->loadPageData();
 421                 }
 422                 return $this->mId;
 423         }
 424
 425         /**
 426          * @return bool Whether or not the page exists in the database
 427          */
 428         public function exists() {
 429                 if ( !$this->mDataLoaded ) {
 430                         $this->loadPageData();
 431                 }
 432                 return $this->mId > 0;
 433         }
 434
 435         /**
 436          * Check if this page is something we're going to be showing
 437          * some sort of sensible content for. If we return false, page
 438          * views (plain action=view) will return an HTTP 404 response,
 439          * so spiders and robots can know they're following a bad link.
 440          *
 441          * @return bool
 442          */
 443         public function hasViewableContent() {
 444                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 445         }
 446
 447         /**
 448          * @return int The view count for the page
 449          */
 450         public function getCount() {
 451                 if ( !$this->mDataLoaded ) {
 452                         $this->loadPageData();
 453                 }
 454
 455                 return $this->mCounter;
 456         }
 457
 458         /**
 459          * Tests if the article content represents a redirect
 460          *
 461          * @return bool
 462          */
 463         public function isRedirect() {
 464                 $content = $this->getContent();
 465                 if ( !$content ) return false;
 466
 467                 return $content->isRedirect();
 468         }
 469
 470         /**
 471          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 472          *
 473          * Will use the revisions actual content model if the page exists,
 474          * and the page's default if the page doesn't exist yet.
 475          *
 476          * @return String
 477          *
 478          * @since 1.21
 479          */
 480         public function getContentModel() {
 481                 if ( $this->exists() ) {
 482                         // look at the revision's actual content model
 483                         $rev = $this->getRevision();
 484
 485                         if ( $rev !== null ) {
 486                                 return $rev->getContentModel();
 487                         } else {
 488                                 $title = $this->mTitle->getPrefixedDBkey();
 489                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 490                         }
 491                 }
 492
 493                 // use the default model for this page
 494                 return $this->mTitle->getContentModel();
 495         }
 496
 497         /**
 498          * Loads page_touched and returns a value indicating if it should be used
 499          * @return boolean true if not a redirect
 500          */
 501         public function checkTouched() {
 502                 if ( !$this->mDataLoaded ) {
 503                         $this->loadPageData();
 504                 }
 505                 return !$this->mIsRedirect;
 506         }
 507
 508         /**
 509          * Get the page_touched field
 510          * @return string containing GMT timestamp
 511          */
 512         public function getTouched() {
 513                 if ( !$this->mDataLoaded ) {
 514                         $this->loadPageData();
 515                 }
 516                 return $this->mTouched;
 517         }
 518
 519         /**
 520          * Get the page_latest field
 521          * @return integer rev_id of current revision
 522          */
 523         public function getLatest() {
 524                 if ( !$this->mDataLoaded ) {
 525                         $this->loadPageData();
 526                 }
 527                 return (int)$this->mLatest;
 528         }
 529
 530         /**
 531          * Get the Revision object of the oldest revision
 532          * @return Revision|null
 533          */
 534         public function getOldestRevision() {
 535                 wfProfileIn( __METHOD__ );
 536
 537                 // Try using the slave database first, then try the master
 538                 $continue = 2;
 539                 $db = wfGetDB( DB_SLAVE );
 540                 $revSelectFields = Revision::selectFields();
 541
 542                 while ( $continue ) {
 543                         $row = $db->selectRow(
 544                                 array( 'page', 'revision' ),
 545                                 $revSelectFields,
 546                                 array(
 547                                         'page_namespace' => $this->mTitle->getNamespace(),
 548                                         'page_title' => $this->mTitle->getDBkey(),
 549                                         'rev_page = page_id'
 550                                 ),
 551                                 __METHOD__,
 552                                 array(
 553                                         'ORDER BY' => 'rev_timestamp ASC'
 554                                 )
 555                         );
 556
 557                         if ( $row ) {
 558                                 $continue = 0;
 559                         } else {
 560                                 $db = wfGetDB( DB_MASTER );
 561                                 $continue--;
 562                         }
 563                 }
 564
 565                 wfProfileOut( __METHOD__ );
 566                 return $row ? Revision::newFromRow( $row ) : null;
 567         }
 568
 569         /**
 570          * Loads everything except the text
 571          * This isn't necessary for all uses, so it's only done if needed.
 572          */
 573         protected function loadLastEdit() {
 574                 if ( $this->mLastRevision !== null ) {
 575                         return; // already loaded
 576                 }
 577
 578                 $latest = $this->getLatest();
 579                 if ( !$latest ) {
 580                         return; // page doesn't exist or is missing page_latest info
 581                 }
 582
 583                 // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always includes the
 584                 // latest changes committed. This is true even within REPEATABLE-READ transactions, where
 585                 // S1 normally only sees changes committed before the first S1 SELECT. Thus we need S1 to
 586                 // also gets the revision row FOR UPDATE; otherwise, it may not find it since a page row
 587                 // UPDATE and revision row INSERT by S2 may have happened after the first S1 SELECT.
 588                 // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 589                 $flags = ( $this->mDataLoadedFrom == self::READ_LOCKING ) ? Revision::READ_LOCKING : 0;
 590                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 591                 if ( $revision ) { // sanity
 592                         $this->setLastEdit( $revision );
 593                 }
 594         }
 595
 596         /**
 597          * Set the latest revision
 598          */
 599         protected function setLastEdit( Revision $revision ) {
 600                 $this->mLastRevision = $revision;
 601                 $this->mTimestamp = $revision->getTimestamp();
 602         }
 603
 604         /**
 605          * Get the latest revision
 606          * @return Revision|null
 607          */
 608         public function getRevision() {
 609                 $this->loadLastEdit();
 610                 if ( $this->mLastRevision ) {
 611                         return $this->mLastRevision;
 612                 }
 613                 return null;
 614         }
 615
 616         /**
 617          * Get the content of the current revision. No side-effects...
 618          *
 619          * @param $audience Integer: one of:
 620          *      Revision::FOR_PUBLIC       to be displayed to all users
 621          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 622          *      Revision::RAW              get the text regardless of permissions
 623          * @param $user User object to check for, only if FOR_THIS_USER is passed
 624          *              to the $audience parameter
 625          * @return Content|null The content of the current revision
 626          *
 627          * @since 1.21
 628          */
 629         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 630                 $this->loadLastEdit();
 631                 if ( $this->mLastRevision ) {
 632                         return $this->mLastRevision->getContent( $audience, $user );
 633                 }
 634                 return null;
 635         }
 636
 637         /**
 638          * Get the text of the current revision. No side-effects...
 639          *
 640          * @param $audience Integer: one of:
 641          *      Revision::FOR_PUBLIC       to be displayed to all users
 642          *      Revision::FOR_THIS_USER    to be displayed to the given user
 643          *      Revision::RAW              get the text regardless of permissions
 644          * @param $user User object to check for, only if FOR_THIS_USER is passed
 645          *              to the $audience parameter
 646          * @return String|false The text of the current revision
 647          * @deprecated as of 1.21, getContent() should be used instead.
 648          */
 649         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) { // @todo: deprecated, replace usage!
 650                 ContentHandler::deprecated( __METHOD__, '1.21' );
 651
 652                 $this->loadLastEdit();
 653                 if ( $this->mLastRevision ) {
 654                         return $this->mLastRevision->getText( $audience, $user );
 655                 }
 656                 return false;
 657         }
 658
 659         /**
 660          * Get the text of the current revision. No side-effects...
 661          *
 662          * @return String|bool The text of the current revision. False on failure
 663          * @deprecated as of 1.21, getContent() should be used instead.
 664          */
 665         public function getRawText() {
 666                 ContentHandler::deprecated( __METHOD__, '1.21' );
 667
 668                 return $this->getText( Revision::RAW );
 669         }
 670
 671         /**
 672          * @return string MW timestamp of last article revision
 673          */
 674         public function getTimestamp() {
 675                 // Check if the field has been filled by WikiPage::setTimestamp()
 676                 if ( !$this->mTimestamp ) {
 677                         $this->loadLastEdit();
 678                 }
 679
 680                 return wfTimestamp( TS_MW, $this->mTimestamp );
 681         }
 682
 683         /**
 684          * Set the page timestamp (use only to avoid DB queries)
 685          * @param string $ts MW timestamp of last article revision
 686          * @return void
 687          */
 688         public function setTimestamp( $ts ) {
 689                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 690         }
 691
 692         /**
 693          * @param $audience Integer: one of:
 694          *      Revision::FOR_PUBLIC       to be displayed to all users
 695          *      Revision::FOR_THIS_USER    to be displayed to the given user
 696          *      Revision::RAW              get the text regardless of permissions
 697          * @param $user User object to check for, only if FOR_THIS_USER is passed
 698          *              to the $audience parameter
 699          * @return int user ID for the user that made the last article revision
 700          */
 701         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 702                 $this->loadLastEdit();
 703                 if ( $this->mLastRevision ) {
 704                         return $this->mLastRevision->getUser( $audience, $user );
 705                 } else {
 706                         return -1;
 707                 }
 708         }
 709
 710         /**
 711          * Get the User object of the user who created the page
 712          * @param $audience Integer: one of:
 713          *      Revision::FOR_PUBLIC       to be displayed to all users
 714          *      Revision::FOR_THIS_USER    to be displayed to the given user
 715          *      Revision::RAW              get the text regardless of permissions
 716          * @param $user User object to check for, only if FOR_THIS_USER is passed
 717          *              to the $audience parameter
 718          * @return User|null
 719          */
 720         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 721                 $revision = $this->getOldestRevision();
 722                 if ( $revision ) {
 723                         $userName = $revision->getUserText( $audience, $user );
 724                         return User::newFromName( $userName, false );
 725                 } else {
 726                         return null;
 727                 }
 728         }
 729
 730         /**
 731          * @param $audience Integer: one of:
 732          *      Revision::FOR_PUBLIC       to be displayed to all users
 733          *      Revision::FOR_THIS_USER    to be displayed to the given user
 734          *      Revision::RAW              get the text regardless of permissions
 735          * @param $user User object to check for, only if FOR_THIS_USER is passed
 736          *              to the $audience parameter
 737          * @return string username of the user that made the last article revision
 738          */
 739         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 740                 $this->loadLastEdit();
 741                 if ( $this->mLastRevision ) {
 742                         return $this->mLastRevision->getUserText( $audience, $user );
 743                 } else {
 744                         return '';
 745                 }
 746         }
 747
 748         /**
 749          * @param $audience Integer: one of:
 750          *      Revision::FOR_PUBLIC       to be displayed to all users
 751          *      Revision::FOR_THIS_USER    to be displayed to the given user
 752          *      Revision::RAW              get the text regardless of permissions
 753          * @param $user User object to check for, only if FOR_THIS_USER is passed
 754          *              to the $audience parameter
 755          * @return string Comment stored for the last article revision
 756          */
 757         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 758                 $this->loadLastEdit();
 759                 if ( $this->mLastRevision ) {
 760                         return $this->mLastRevision->getComment( $audience, $user );
 761                 } else {
 762                         return '';
 763                 }
 764         }
 765
 766         /**
 767          * Returns true if last revision was marked as "minor edit"
 768          *
 769          * @return boolean Minor edit indicator for the last article revision.
 770          */
 771         public function getMinorEdit() {
 772                 $this->loadLastEdit();
 773                 if ( $this->mLastRevision ) {
 774                         return $this->mLastRevision->isMinor();
 775                 } else {
 776                         return false;
 777                 }
 778         }
 779
 780         /**
 781          * Get the cached timestamp for the last time the page changed.
 782          * This is only used to help handle slave lag by comparing to page_touched.
 783          * @return string MW timestamp
 784          */
 785         protected function getCachedLastEditTime() {
 786                 global $wgMemc;
 787                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 788                 return $wgMemc->get( $key );
 789         }
 790
 791         /**
 792          * Set the cached timestamp for the last time the page changed.
 793          * This is only used to help handle slave lag by comparing to page_touched.
 794          * @param $timestamp string
 795          * @return void
 796          */
 797         public function setCachedLastEditTime( $timestamp ) {
 798                 global $wgMemc;
 799                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 800                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60 * 15 );
 801         }
 802
 803         /**
 804          * Determine whether a page would be suitable for being counted as an
 805          * article in the site_stats table based on the title & its content
 806          *
 807          * @param $editInfo Object|bool (false): object returned by prepareTextForEdit(),
 808          *        if false, the current database state will be used
 809          * @return Boolean
 810          */
 811         public function isCountable( $editInfo = false ) {
 812                 global $wgArticleCountMethod;
 813
 814                 if ( !$this->mTitle->isContentPage() ) {
 815                         return false;
 816                 }
 817
 818                 if ( $editInfo ) {
 819                         $content = $editInfo->pstContent;
 820                 } else {
 821                         $content = $this->getContent();
 822                 }
 823
 824                 if ( !$content || $content->isRedirect() ) {
 825                         return false;
 826                 }
 827
 828                 $hasLinks = null;
 829
 830                 if ( $wgArticleCountMethod === 'link' ) {
 831                         // nasty special case to avoid re-parsing to detect links
 832
 833                         if ( $editInfo ) {
 834                                 // ParserOutput::getLinks() is a 2D array of page links, so
 835                                 // to be really correct we would need to recurse in the array
 836                                 // but the main array should only have items in it if there are
 837                                 // links.
 838                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 839                         } else {
 840                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 841                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 842                         }
 843                 }
 844
 845                 return $content->isCountable( $hasLinks );
 846         }
 847
 848         /**
 849          * If this page is a redirect, get its target
 850          *
 851          * The target will be fetched from the redirect table if possible.
 852          * If this page doesn't have an entry there, call insertRedirect()
 853          * @return Title|mixed object, or null if this page is not a redirect
 854          */
 855         public function getRedirectTarget() {
 856                 if ( !$this->mTitle->isRedirect() ) {
 857                         return null;
 858                 }
 859
 860                 if ( $this->mRedirectTarget !== null ) {
 861                         return $this->mRedirectTarget;
 862                 }
 863
 864                 // Query the redirect table
 865                 $dbr = wfGetDB( DB_SLAVE );
 866                 $row = $dbr->selectRow( 'redirect',
 867                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 868                         array( 'rd_from' => $this->getId() ),
 869                         __METHOD__
 870                 );
 871
 872                 // rd_fragment and rd_interwiki were added later, populate them if empty
 873                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 874                         return $this->mRedirectTarget = Title::makeTitle(
 875                                 $row->rd_namespace, $row->rd_title,
 876                                 $row->rd_fragment, $row->rd_interwiki );
 877                 }
 878
 879                 // This page doesn't have an entry in the redirect table
 880                 return $this->mRedirectTarget = $this->insertRedirect();
 881         }
 882
 883         /**
 884          * Insert an entry for this page into the redirect table.
 885          *
 886          * Don't call this function directly unless you know what you're doing.
 887          * @return Title object or null if not a redirect
 888          */
 889         public function insertRedirect() {
 890                 // recurse through to only get the final target
 891                 $content = $this->getContent();
 892                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 893                 if ( !$retval ) {
 894                         return null;
 895                 }
 896                 $this->insertRedirectEntry( $retval );
 897                 return $retval;
 898         }
 899
 900         /**
 901          * Insert or update the redirect table entry for this page to indicate
 902          * it redirects to $rt .
 903          * @param $rt Title redirect target
 904          */
 905         public function insertRedirectEntry( $rt ) {
 906                 $dbw = wfGetDB( DB_MASTER );
 907                 $dbw->replace( 'redirect', array( 'rd_from' ),
 908                         array(
 909                                 'rd_from'      => $this->getId(),
 910                                 'rd_namespace' => $rt->getNamespace(),
 911                                 'rd_title'     => $rt->getDBkey(),
 912                                 'rd_fragment'  => $rt->getFragment(),
 913                                 'rd_interwiki' => $rt->getInterwiki(),
 914                         ),
 915                         __METHOD__
 916                 );
 917         }
 918
 919         /**
 920          * Get the Title object or URL this page redirects to
 921          *
 922          * @return mixed false, Title of in-wiki target, or string with URL
 923          */
 924         public function followRedirect() {
 925                 return $this->getRedirectURL( $this->getRedirectTarget() );
 926         }
 927
 928         /**
 929          * Get the Title object or URL to use for a redirect. We use Title
 930          * objects for same-wiki, non-special redirects and URLs for everything
 931          * else.
 932          * @param $rt Title Redirect target
 933          * @return mixed false, Title object of local target, or string with URL
 934          */
 935         public function getRedirectURL( $rt ) {
 936                 if ( !$rt ) {
 937                         return false;
 938                 }
 939
 940                 if ( $rt->isExternal() ) {
 941                         if ( $rt->isLocal() ) {
 942                                 // Offsite wikis need an HTTP redirect.
 943                                 //
 944                                 // This can be hard to reverse and may produce loops,
 945                                 // so they may be disabled in the site configuration.
 946                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 947                                 return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
 948                         } else {
 949                                 // External pages pages without "local" bit set are not valid
 950                                 // redirect targets
 951                                 return false;
 952                         }
 953                 }
 954
 955                 if ( $rt->isSpecialPage() ) {
 956                         // Gotta handle redirects to special pages differently:
 957                         // Fill the HTTP response "Location" header and ignore
 958                         // the rest of the page we're on.
 959                         //
 960                         // Some pages are not valid targets
 961                         if ( $rt->isValidRedirectTarget() ) {
 962                                 return $rt->getFullURL();
 963                         } else {
 964                                 return false;
 965                         }
 966                 }
 967
 968                 return $rt;
 969         }
 970
 971         /**
 972          * Get a list of users who have edited this article, not including the user who made
 973          * the most recent revision, which you can get from $article->getUser() if you want it
 974          * @return UserArrayFromResult
 975          */
 976         public function getContributors() {
 977                 // @todo FIXME: This is expensive; cache this info somewhere.
 978
 979                 $dbr = wfGetDB( DB_SLAVE );
 980
 981                 if ( $dbr->implicitGroupby() ) {
 982                         $realNameField = 'user_real_name';
 983                 } else {
 984                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 985                 }
 986
 987                 $tables = array( 'revision', 'user' );
 988
 989                 $fields = array(
 990                         'user_id' => 'rev_user',
 991                         'user_name' => 'rev_user_text',
 992                         $realNameField,
 993                         'timestamp' => 'MAX(rev_timestamp)',
 994                 );
 995
 996                 $conds = array( 'rev_page' => $this->getId() );
 997
 998                 // The user who made the top revision gets credited as "this page was last edited by
 999                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1000                 $user = $this->getUser();
1001                 if ( $user ) {
1002                         $conds[] = "rev_user != $user";
1003                 } else {
1004                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1005                 }
1006
1007                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
1008
1009                 $jconds = array(
1010                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
1011                 );
1012
1013                 $options = array(
1014                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
1015                         'ORDER BY' => 'timestamp DESC',
1016                 );
1017
1018                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1019                 return new UserArrayFromResult( $res );
1020         }
1021
1022         /**
1023          * Get the last N authors
1024          * @param $num Integer: number of revisions to get
1025          * @param string $revLatest the latest rev_id, selected from the master (optional)
1026          * @return array Array of authors, duplicates not removed
1027          */
1028         public function getLastNAuthors( $num, $revLatest = 0 ) {
1029                 wfProfileIn( __METHOD__ );
1030                 // First try the slave
1031                 // If that doesn't have the latest revision, try the master
1032                 $continue = 2;
1033                 $db = wfGetDB( DB_SLAVE );
1034
1035                 do {
1036                         $res = $db->select( array( 'page', 'revision' ),
1037                                 array( 'rev_id', 'rev_user_text' ),
1038                                 array(
1039                                         'page_namespace' => $this->mTitle->getNamespace(),
1040                                         'page_title' => $this->mTitle->getDBkey(),
1041                                         'rev_page = page_id'
1042                                 ), __METHOD__,
1043                                 array(
1044                                         'ORDER BY' => 'rev_timestamp DESC',
1045                                         'LIMIT' => $num
1046                                 )
1047                         );
1048
1049                         if ( !$res ) {
1050                                 wfProfileOut( __METHOD__ );
1051                                 return array();
1052                         }
1053
1054                         $row = $db->fetchObject( $res );
1055
1056                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1057                                 $db = wfGetDB( DB_MASTER );
1058                                 $continue--;
1059                         } else {
1060                                 $continue = 0;
1061                         }
1062                 } while ( $continue );
1063
1064                 $authors = array( $row->rev_user_text );
1065
1066                 foreach ( $res as $row ) {
1067                         $authors[] = $row->rev_user_text;
1068                 }
1069
1070                 wfProfileOut( __METHOD__ );
1071                 return $authors;
1072         }
1073
1074         /**
1075          * Should the parser cache be used?
1076          *
1077          * @param $parserOptions ParserOptions to check
1078          * @param $oldid int
1079          * @return boolean
1080          */
1081         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1082                 global $wgEnableParserCache;
1083
1084                 return $wgEnableParserCache
1085                         && $parserOptions->getStubThreshold() == 0
1086                         && $this->exists()
1087                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1088                         && $this->getContentHandler()->isParserCacheSupported();
1089         }
1090
1091         /**
1092          * Get a ParserOutput for the given ParserOptions and revision ID.
1093          * The parser cache will be used if possible.
1094          *
1095          * @since 1.19
1096          * @param $parserOptions ParserOptions to use for the parse operation
1097          * @param $oldid Revision ID to get the text from, passing null or 0 will
1098          *               get the current revision (default value)
1099          *
1100          * @return ParserOutput or false if the revision was not found
1101          */
1102         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1103                 wfProfileIn( __METHOD__ );
1104
1105                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1106                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1107                 if ( $parserOptions->getStubThreshold() ) {
1108                         wfIncrStats( 'pcache_miss_stub' );
1109                 }
1110
1111                 if ( $useParserCache ) {
1112                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1113                         if ( $parserOutput !== false ) {
1114                                 wfProfileOut( __METHOD__ );
1115                                 return $parserOutput;
1116                         }
1117                 }
1118
1119                 if ( $oldid === null || $oldid === 0 ) {
1120                         $oldid = $this->getLatest();
1121                 }
1122
1123                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1124                 $pool->execute();
1125
1126                 wfProfileOut( __METHOD__ );
1127
1128                 return $pool->getParserOutput();
1129         }
1130
1131         /**
1132          * Do standard deferred updates after page view
1133          * @param $user User The relevant user
1134          */
1135         public function doViewUpdates( User $user ) {
1136                 global $wgDisableCounters;
1137                 if ( wfReadOnly() ) {
1138                         return;
1139                 }
1140
1141                 // Don't update page view counters on views from bot users (bug 14044)
1142                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->exists() ) {
1143                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1144                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1145                 }
1146
1147                 // Update newtalk / watchlist notification status
1148                 $user->clearNotification( $this->mTitle );
1149         }
1150
1151         /**
1152          * Perform the actions of a page purging
1153          * @return bool
1154          */
1155         public function doPurge() {
1156                 global $wgUseSquid;
1157
1158                 if( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1159                         return false;
1160                 }
1161
1162                 // Invalidate the cache
1163                 $this->mTitle->invalidateCache();
1164
1165                 if ( $wgUseSquid ) {
1166                         // Commit the transaction before the purge is sent
1167                         $dbw = wfGetDB( DB_MASTER );
1168                         $dbw->commit( __METHOD__ );
1169
1170                         // Send purge
1171                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1172                         $update->doUpdate();
1173                 }
1174
1175                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1176                         // @todo: move this logic to MessageCache
1177
1178                         if ( $this->exists() ) {
1179                                 // NOTE: use transclusion text for messages.
1180                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1181
1182                                 $content = $this->getContent();
1183                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1184
1185                                 if ( $text === null ) $text = false;
1186                         } else {
1187                                 $text = false;
1188                         }
1189
1190                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1191                 }
1192                 return true;
1193         }
1194
1195         /**
1196          * Insert a new empty page record for this article.
1197          * This *must* be followed up by creating a revision
1198          * and running $this->updateRevisionOn( ... );
1199          * or else the record will be left in a funky state.
1200          * Best if all done inside a transaction.
1201          *
1202          * @param $dbw DatabaseBase
1203          * @return int The newly created page_id key, or false if the title already existed
1204          */
1205         public function insertOn( $dbw ) {
1206                 wfProfileIn( __METHOD__ );
1207
1208                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1209                 $dbw->insert( 'page', array(
1210                         'page_id'           => $page_id,
1211                         'page_namespace'    => $this->mTitle->getNamespace(),
1212                         'page_title'        => $this->mTitle->getDBkey(),
1213                         'page_counter'      => 0,
1214                         'page_restrictions' => '',
1215                         'page_is_redirect'  => 0, // Will set this shortly...
1216                         'page_is_new'       => 1,
1217                         'page_random'       => wfRandom(),
1218                         'page_touched'      => $dbw->timestamp(),
1219                         'page_latest'       => 0, // Fill this in shortly...
1220                         'page_len'          => 0, // Fill this in shortly...
1221                 ), __METHOD__, 'IGNORE' );
1222
1223                 $affected = $dbw->affectedRows();
1224
1225                 if ( $affected ) {
1226                         $newid = $dbw->insertId();
1227                         $this->mId = $newid;
1228                         $this->mTitle->resetArticleID( $newid );
1229                 }
1230                 wfProfileOut( __METHOD__ );
1231
1232                 return $affected ? $newid : false;
1233         }
1234
1235         /**
1236          * Update the page record to point to a newly saved revision.
1237          *
1238          * @param $dbw DatabaseBase: object
1239          * @param $revision Revision: For ID number, and text used to set
1240          *                  length and redirect status fields
1241          * @param $lastRevision Integer: if given, will not overwrite the page field
1242          *                      when different from the currently set value.
1243          *                      Giving 0 indicates the new page flag should be set
1244          *                      on.
1245          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1246          *                           removing rows in redirect table.
1247          * @return bool true on success, false on failure
1248          * @private
1249          */
1250         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1251                 global $wgContentHandlerUseDB;
1252
1253                 wfProfileIn( __METHOD__ );
1254
1255                 $content = $revision->getContent();
1256                 $len = $content ? $content->getSize() : 0;
1257                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1258
1259                 $conditions = array( 'page_id' => $this->getId() );
1260
1261                 if ( !is_null( $lastRevision ) ) {
1262                         // An extra check against threads stepping on each other
1263                         $conditions['page_latest'] = $lastRevision;
1264                 }
1265
1266                 $now = wfTimestampNow();
1267                 $row = array( /* SET */
1268                         'page_latest'      => $revision->getId(),
1269                         'page_touched'     => $dbw->timestamp( $now ),
1270                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1271                         'page_is_redirect' => $rt !== null ? 1 : 0,
1272                         'page_len'         => $len,
1273                 );
1274
1275                 if ( $wgContentHandlerUseDB ) {
1276                         $row['page_content_model'] = $revision->getContentModel();
1277                 }
1278
1279                 $dbw->update( 'page',
1280                         $row,
1281                         $conditions,
1282                         __METHOD__ );
1283
1284                 $result = $dbw->affectedRows() > 0;
1285                 if ( $result ) {
1286                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1287                         $this->setLastEdit( $revision );
1288                         $this->setCachedLastEditTime( $now );
1289                         $this->mLatest = $revision->getId();
1290                         $this->mIsRedirect = (bool)$rt;
1291                         // Update the LinkCache.
1292                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect,
1293                                                                                                         $this->mLatest, $revision->getContentModel() );
1294                 }
1295
1296                 wfProfileOut( __METHOD__ );
1297                 return $result;
1298         }
1299
1300         /**
1301          * Add row to the redirect table if this is a redirect, remove otherwise.
1302          *
1303          * @param $dbw DatabaseBase
1304          * @param $redirectTitle Title object pointing to the redirect target,
1305          *                       or NULL if this is not a redirect
1306          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1307          *                           removing rows in redirect table.
1308          * @return bool true on success, false on failure
1309          * @private
1310          */
1311         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1312                 // Always update redirects (target link might have changed)
1313                 // Update/Insert if we don't know if the last revision was a redirect or not
1314                 // Delete if changing from redirect to non-redirect
1315                 $isRedirect = !is_null( $redirectTitle );
1316
1317                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1318                         return true;
1319                 }
1320
1321                 wfProfileIn( __METHOD__ );
1322                 if ( $isRedirect ) {
1323                         $this->insertRedirectEntry( $redirectTitle );
1324                 } else {
1325                         // This is not a redirect, remove row from redirect table
1326                         $where = array( 'rd_from' => $this->getId() );
1327                         $dbw->delete( 'redirect', $where, __METHOD__ );
1328                 }
1329
1330                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1331                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1332                 }
1333                 wfProfileOut( __METHOD__ );
1334
1335                 return ( $dbw->affectedRows() != 0 );
1336         }
1337
1338         /**
1339          * If the given revision is newer than the currently set page_latest,
1340          * update the page record. Otherwise, do nothing.
1341          *
1342          * @param $dbw DatabaseBase object
1343          * @param $revision Revision object
1344          * @return mixed
1345          */
1346         public function updateIfNewerOn( $dbw, $revision ) {
1347                 wfProfileIn( __METHOD__ );
1348
1349                 $row = $dbw->selectRow(
1350                         array( 'revision', 'page' ),
1351                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1352                         array(
1353                                 'page_id' => $this->getId(),
1354                                 'page_latest=rev_id' ),
1355                         __METHOD__ );
1356
1357                 if ( $row ) {
1358                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1359                                 wfProfileOut( __METHOD__ );
1360                                 return false;
1361                         }
1362                         $prev = $row->rev_id;
1363                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1364                 } else {
1365                         // No or missing previous revision; mark the page as new
1366                         $prev = 0;
1367                         $lastRevIsRedirect = null;
1368                 }
1369
1370                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1371
1372                 wfProfileOut( __METHOD__ );
1373                 return $ret;
1374         }
1375
1376         /**
1377          * Get the content that needs to be saved in order to undo all revisions
1378          * between $undo and $undoafter. Revisions must belong to the same page,
1379          * must exist and must not be deleted
1380          * @param $undo Revision
1381          * @param $undoafter Revision Must be an earlier revision than $undo
1382          * @return mixed string on success, false on failure
1383          * @since 1.21
1384          * Before we had the Content object, this was done in getUndoText
1385          */
1386         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1387                 $handler = $undo->getContentHandler();
1388                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1389         }
1390
1391         /**
1392          * Get the text that needs to be saved in order to undo all revisions
1393          * between $undo and $undoafter. Revisions must belong to the same page,
1394          * must exist and must not be deleted
1395          * @param $undo Revision
1396          * @param $undoafter Revision Must be an earlier revision than $undo
1397          * @return mixed string on success, false on failure
1398          * @deprecated since 1.21: use ContentHandler::getUndoContent() instead.
1399          */
1400         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1401                 ContentHandler::deprecated( __METHOD__, '1.21' );
1402
1403                 $this->loadLastEdit();
1404
1405                 if ( $this->mLastRevision ) {
1406                         if ( is_null( $undoafter ) ) {
1407                                 $undoafter = $undo->getPrevious();
1408                         }
1409
1410                         $handler = $this->getContentHandler();
1411                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1412
1413                         if ( !$undone ) {
1414                                 return false;
1415                         } else {
1416                                 return ContentHandler::getContentText( $undone );
1417                         }
1418                 }
1419
1420                 return false;
1421         }
1422
1423         /**
1424          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1425          * @param string $text new text of the section
1426          * @param string $sectionTitle new section's subject, only if $section is 'new'
1427          * @param string $edittime revision timestamp or null to use the current revision
1428          * @throws MWException
1429          * @return String new complete article text, or null if error
1430          *
1431          * @deprecated since 1.21, use replaceSectionContent() instead
1432          */
1433         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1434                 ContentHandler::deprecated( __METHOD__, '1.21' );
1435
1436                 if ( strval( $section ) == '' ) { //NOTE: keep condition in sync with condition in replaceSectionContent!
1437                         // Whole-page edit; let the whole text through
1438                         return $text;
1439                 }
1440
1441                 if ( !$this->supportsSections() ) {
1442                         throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1443                 }
1444
1445                 // could even make section title, but that's not required.
1446                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() );
1447
1448                 $newContent = $this->replaceSectionContent( $section, $sectionContent, $sectionTitle, $edittime );
1449
1450                 return ContentHandler::getContentText( $newContent );
1451         }
1452
1453         /**
1454          * Returns true iff this page's content model supports sections.
1455          *
1456          * @return boolean whether sections are supported.
1457          *
1458          * @todo: the skin should check this and not offer section functionality if sections are not supported.
1459          * @todo: the EditPage should check this and not offer section functionality if sections are not supported.
1460          */
1461         public function supportsSections() {
1462                 return $this->getContentHandler()->supportsSections();
1463         }
1464
1465         /**
1466          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1467          * @param $sectionContent Content: new content of the section
1468          * @param string $sectionTitle new section's subject, only if $section is 'new'
1469          * @param string $edittime revision timestamp or null to use the current revision
1470          *
1471          * @throws MWException
1472          * @return Content new complete article content, or null if error
1473          *
1474          * @since 1.21
1475          */
1476         public function replaceSectionContent( $section, Content $sectionContent, $sectionTitle = '', $edittime = null ) {
1477                 wfProfileIn( __METHOD__ );
1478
1479                 if ( strval( $section ) == '' ) {
1480                         // Whole-page edit; let the whole text through
1481                         $newContent = $sectionContent;
1482                 } else {
1483                         if ( !$this->supportsSections() ) {
1484                                 wfProfileOut( __METHOD__ );
1485                                 throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1486                         }
1487
1488                         // Bug 30711: always use current version when adding a new section
1489                         if ( is_null( $edittime ) || $section == 'new' ) {
1490                                 $oldContent = $this->getContent();
1491                         } else {
1492                                 $dbw = wfGetDB( DB_MASTER );
1493                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1494
1495                                 if ( !$rev ) {
1496                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1497                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1498                                         wfProfileOut( __METHOD__ );
1499                                         return null;
1500                                 }
1501
1502                                 $oldContent = $rev->getContent();
1503                         }
1504
1505                         if ( ! $oldContent ) {
1506                                 wfDebug( __METHOD__ . ": no page text\n" );
1507                                 wfProfileOut( __METHOD__ );
1508                                 return null;
1509                         }
1510
1511                         // FIXME: $oldContent might be null?
1512                         $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1513                 }
1514
1515                 wfProfileOut( __METHOD__ );
1516                 return $newContent;
1517         }
1518
1519         /**
1520          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1521          * @param $flags Int
1522          * @return Int updated $flags
1523          */
1524         function checkFlags( $flags ) {
1525                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1526                         if ( $this->exists() ) {
1527                                 $flags |= EDIT_UPDATE;
1528                         } else {
1529                                 $flags |= EDIT_NEW;
1530                         }
1531                 }
1532
1533                 return $flags;
1534         }
1535
1536         /**
1537          * Change an existing article or create a new article. Updates RC and all necessary caches,
1538          * optionally via the deferred update array.
1539          *
1540          * @param string $text new text
1541          * @param string $summary edit summary
1542          * @param $flags Integer bitfield:
1543          *      EDIT_NEW
1544          *          Article is known or assumed to be non-existent, create a new one
1545          *      EDIT_UPDATE
1546          *          Article is known or assumed to be pre-existing, update it
1547          *      EDIT_MINOR
1548          *          Mark this edit minor, if the user is allowed to do so
1549          *      EDIT_SUPPRESS_RC
1550          *          Do not log the change in recentchanges
1551          *      EDIT_FORCE_BOT
1552          *          Mark the edit a "bot" edit regardless of user rights
1553          *      EDIT_DEFER_UPDATES
1554          *          Defer some of the updates until the end of index.php
1555          *      EDIT_AUTOSUMMARY
1556          *          Fill in blank summaries with generated text where possible
1557          *
1558          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1559          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1560          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1561          * edit-already-exists error will be returned. These two conditions are also possible with
1562          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1563          *
1564          * @param bool|int $baseRevId int the revision ID this edit was based off, if any
1565          * @param $user User the user doing the edit
1566          *
1567          * @throws MWException
1568          * @return Status object. Possible errors:
1569          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1570          *     edit-gone-missing:       In update mode, but the article didn't exist
1571          *     edit-conflict:           In update mode, the article changed unexpectedly
1572          *     edit-no-change:          Warning that the text was the same as before
1573          *     edit-already-exists:     In creation mode, but the article already exists
1574          *
1575          *  Extensions may define additional errors.
1576          *
1577          *  $return->value will contain an associative array with members as follows:
1578          *     new:                     Boolean indicating if the function attempted to create a new article
1579          *     revision:                The revision object for the inserted revision, or null
1580          *
1581          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1582          *
1583          * @deprecated since 1.21: use doEditContent() instead.
1584          */
1585         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1586                 ContentHandler::deprecated( __METHOD__, '1.21' );
1587
1588                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1589
1590                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1591         }
1592
1593         /**
1594          * Change an existing article or create a new article. Updates RC and all necessary caches,
1595          * optionally via the deferred update array.
1596          *
1597          * @param $content Content: new content
1598          * @param string $summary edit summary
1599          * @param $flags Integer bitfield:
1600          *      EDIT_NEW
1601          *          Article is known or assumed to be non-existent, create a new one
1602          *      EDIT_UPDATE
1603          *          Article is known or assumed to be pre-existing, update it
1604          *      EDIT_MINOR
1605          *          Mark this edit minor, if the user is allowed to do so
1606          *      EDIT_SUPPRESS_RC
1607          *          Do not log the change in recentchanges
1608          *      EDIT_FORCE_BOT
1609          *          Mark the edit a "bot" edit regardless of user rights
1610          *      EDIT_DEFER_UPDATES
1611          *          Defer some of the updates until the end of index.php
1612          *      EDIT_AUTOSUMMARY
1613          *          Fill in blank summaries with generated text where possible
1614          *
1615          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1616          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1617          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1618          * edit-already-exists error will be returned. These two conditions are also possible with
1619          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1620          *
1621          * @param bool|\the $baseRevId the revision ID this edit was based off, if any
1622          * @param $user User the user doing the edit
1623          * @param $serialisation_format String: format for storing the content in the database
1624          *
1625          * @throws MWException
1626          * @return Status object. Possible errors:
1627          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1628          *     edit-gone-missing:       In update mode, but the article didn't exist
1629          *     edit-conflict:           In update mode, the article changed unexpectedly
1630          *     edit-no-change:          Warning that the text was the same as before
1631          *     edit-already-exists:     In creation mode, but the article already exists
1632          *
1633          *  Extensions may define additional errors.
1634          *
1635          *  $return->value will contain an associative array with members as follows:
1636          *     new:                     Boolean indicating if the function attempted to create a new article
1637          *     revision:                The revision object for the inserted revision, or null
1638          *
1639          * @since 1.21
1640          */
1641         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1642                                                                    User $user = null, $serialisation_format = null ) {
1643                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1644
1645                 // Low-level sanity check
1646                 if ( $this->mTitle->getText() === '' ) {
1647                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1648                 }
1649
1650                 wfProfileIn( __METHOD__ );
1651
1652                 if ( !$content->getContentHandler()->canBeUsedOn( $this->getTitle() ) ) {
1653                         wfProfileOut( __METHOD__ );
1654                         return Status::newFatal( 'content-not-allowed-here',
1655                                 ContentHandler::getLocalizedName( $content->getModel() ),
1656                                 $this->getTitle()->getPrefixedText() );
1657                 }
1658
1659                 $user = is_null( $user ) ? $wgUser : $user;
1660                 $status = Status::newGood( array() );
1661
1662                 // Load the data from the master database if needed.
1663                 // The caller may already loaded it from the master or even loaded it using
1664                 // SELECT FOR UPDATE, so do not override that using clear().
1665                 $this->loadPageData( 'fromdbmaster' );
1666
1667                 $flags = $this->checkFlags( $flags );
1668
1669                 // handle hook
1670                 $hook_args = array( &$this, &$user, &$content, &$summary,
1671                                                         $flags & EDIT_MINOR, null, null, &$flags, &$status );
1672
1673                 if ( !wfRunHooks( 'PageContentSave', $hook_args )
1674                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args ) ) {
1675
1676                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1677
1678                         if ( $status->isOK() ) {
1679                                 $status->fatal( 'edit-hook-aborted' );
1680                         }
1681
1682                         wfProfileOut( __METHOD__ );
1683                         return $status;
1684                 }
1685
1686                 // Silently ignore EDIT_MINOR if not allowed
1687                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1688                 $bot = $flags & EDIT_FORCE_BOT;
1689
1690                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1691
1692                 $oldsize = $old_content ? $old_content->getSize() : 0;
1693                 $oldid = $this->getLatest();
1694                 $oldIsRedirect = $this->isRedirect();
1695                 $oldcountable = $this->isCountable();
1696
1697                 $handler = $content->getContentHandler();
1698
1699                 // Provide autosummaries if one is not provided and autosummaries are enabled.
1700                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1701                         if ( !$old_content ) $old_content = null;
1702                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1703                 }
1704
1705                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1706                 $serialized = $editInfo->pst;
1707                 $content = $editInfo->pstContent;
1708                 $newsize = $content->getSize();
1709
1710                 $dbw = wfGetDB( DB_MASTER );
1711                 $now = wfTimestampNow();
1712                 $this->mTimestamp = $now;
1713
1714                 if ( $flags & EDIT_UPDATE ) {
1715                         // Update article, but only if changed.
1716                         $status->value['new'] = false;
1717
1718                         if ( !$oldid ) {
1719                                 // Article gone missing
1720                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1721                                 $status->fatal( 'edit-gone-missing' );
1722
1723                                 wfProfileOut( __METHOD__ );
1724                                 return $status;
1725                         } elseif ( !$old_content ) {
1726                                 // Sanity check for bug 37225
1727                                 wfProfileOut( __METHOD__ );
1728                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1729                         }
1730
1731                         $revision = new Revision( array(
1732                                 'page'       => $this->getId(),
1733                                 'title'      => $this->getTitle(), // for determining the default content model
1734                                 'comment'    => $summary,
1735                                 'minor_edit' => $isminor,
1736                                 'text'       => $serialized,
1737                                 'len'        => $newsize,
1738                                 'parent_id'  => $oldid,
1739                                 'user'       => $user->getId(),
1740                                 'user_text'  => $user->getName(),
1741                                 'timestamp'  => $now,
1742                                 'content_model' => $content->getModel(),
1743                                 'content_format' => $serialisation_format,
1744                         ) ); // XXX: pass content object?!
1745
1746                         $changed = !$content->equals( $old_content );
1747
1748                         if ( $changed ) {
1749                                 if ( !$content->isValid() ) {
1750                                         wfProfileOut( __METHOD__ );
1751                                         throw new MWException( "New content failed validity check!" );
1752                                 }
1753
1754                                 $dbw->begin( __METHOD__ );
1755
1756                                 $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1757                                 $status->merge( $prepStatus );
1758
1759                                 if ( !$status->isOK() ) {
1760                                         $dbw->rollback( __METHOD__ );
1761
1762                                         wfProfileOut( __METHOD__ );
1763                                         return $status;
1764                                 }
1765
1766                                 $revisionId = $revision->insertOn( $dbw );
1767
1768                                 // Update page
1769                                 //
1770                                 // Note that we use $this->mLatest instead of fetching a value from the master DB
1771                                 // during the course of this function. This makes sure that EditPage can detect
1772                                 // edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1773                                 // before this function is called. A previous function used a separate query, this
1774                                 // creates a window where concurrent edits can cause an ignored edit conflict.
1775                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1776
1777                                 if ( !$ok ) {
1778                                         // Belated edit conflict! Run away!!
1779                                         $status->fatal( 'edit-conflict' );
1780
1781                                         $dbw->rollback( __METHOD__ );
1782
1783                                         wfProfileOut( __METHOD__ );
1784                                         return $status;
1785                                 }
1786
1787                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1788                                 // Update recentchanges
1789                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1790                                         // Mark as patrolled if the user can do so
1791                                         $patrolled = $wgUseRCPatrol && !count(
1792                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1793                                         // Add RC row to the DB
1794                                         $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1795                                                 $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1796                                                 $revisionId, $patrolled
1797                                         );
1798
1799                                         // Log auto-patrolled edits
1800                                         if ( $patrolled ) {
1801                                                 PatrolLog::record( $rc, true, $user );
1802                                         }
1803                                 }
1804                                 $user->incEditCount();
1805                                 $dbw->commit( __METHOD__ );
1806                         } else {
1807                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1808                                 // related variables correctly
1809                                 $revision->setId( $this->getLatest() );
1810                         }
1811
1812                         // Update links tables, site stats, etc.
1813                         $this->doEditUpdates(
1814                                 $revision,
1815                                 $user,
1816                                 array(
1817                                         'changed' => $changed,
1818                                         'oldcountable' => $oldcountable
1819                                 )
1820                         );
1821
1822                         if ( !$changed ) {
1823                                 $status->warning( 'edit-no-change' );
1824                                 $revision = null;
1825                                 // Update page_touched, this is usually implicit in the page update
1826                                 // Other cache updates are done in onArticleEdit()
1827                                 $this->mTitle->invalidateCache();
1828                         }
1829                 } else {
1830                         // Create new article
1831                         $status->value['new'] = true;
1832
1833                         $dbw->begin( __METHOD__ );
1834
1835                         $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1836                         $status->merge( $prepStatus );
1837
1838                         if ( !$status->isOK() ) {
1839                                 $dbw->rollback( __METHOD__ );
1840
1841                                 wfProfileOut( __METHOD__ );
1842                                 return $status;
1843                         }
1844
1845                         $status->merge( $prepStatus );
1846
1847                         // Add the page record; stake our claim on this title!
1848                         // This will return false if the article already exists
1849                         $newid = $this->insertOn( $dbw );
1850
1851                         if ( $newid === false ) {
1852                                 $dbw->rollback( __METHOD__ );
1853                                 $status->fatal( 'edit-already-exists' );
1854
1855                                 wfProfileOut( __METHOD__ );
1856                                 return $status;
1857                         }
1858
1859                         // Save the revision text...
1860                         $revision = new Revision( array(
1861                                 'page'       => $newid,
1862                                 'title'      => $this->getTitle(), // for determining the default content model
1863                                 'comment'    => $summary,
1864                                 'minor_edit' => $isminor,
1865                                 'text'       => $serialized,
1866                                 'len'        => $newsize,
1867                                 'user'       => $user->getId(),
1868                                 'user_text'  => $user->getName(),
1869                                 'timestamp'  => $now,
1870                                 'content_model' => $content->getModel(),
1871                                 'content_format' => $serialisation_format,
1872                         ) );
1873                         $revisionId = $revision->insertOn( $dbw );
1874
1875                         // Bug 37225: use accessor to get the text as Revision may trim it
1876                         $content = $revision->getContent(); // sanity; get normalized version
1877
1878                         if ( $content ) {
1879                                 $newsize = $content->getSize();
1880                         }
1881
1882                         // Update the page record with revision data
1883                         $this->updateRevisionOn( $dbw, $revision, 0 );
1884
1885                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1886
1887                         // Update recentchanges
1888                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1889                                 // Mark as patrolled if the user can do so
1890                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1891                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1892                                 // Add RC row to the DB
1893                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1894                                         '', $newsize, $revisionId, $patrolled );
1895
1896                                 // Log auto-patrolled edits
1897                                 if ( $patrolled ) {
1898                                         PatrolLog::record( $rc, true, $user );
1899                                 }
1900                         }
1901                         $user->incEditCount();
1902                         $dbw->commit( __METHOD__ );
1903
1904                         // Update links, etc.
1905                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1906
1907                         $hook_args = array( &$this, &$user, $content, $summary,
1908                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision );
1909
1910                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $hook_args );
1911                         wfRunHooks( 'PageContentInsertComplete', $hook_args );
1912                 }
1913
1914                 // Do updates right now unless deferral was requested
1915                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1916                         DeferredUpdates::doUpdates();
1917                 }
1918
1919                 // Return the new revision (or null) to the caller
1920                 $status->value['revision'] = $revision;
1921
1922                 $hook_args = array( &$this, &$user, $content, $summary,
1923                                                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId );
1924
1925                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $hook_args );
1926                 wfRunHooks( 'PageContentSaveComplete', $hook_args );
1927
1928                 // Promote user to any groups they meet the criteria for
1929                 $user->addAutopromoteOnceGroups( 'onEdit' );
1930
1931                 wfProfileOut( __METHOD__ );
1932                 return $status;
1933         }
1934
1935         /**
1936          * Get parser options suitable for rendering the primary article wikitext
1937          *
1938          * @see ContentHandler::makeParserOptions
1939          *
1940          * @param IContextSource|User|string $context One of the following:
1941          *        - IContextSource: Use the User and the Language of the provided
1942          *          context
1943          *        - User: Use the provided User object and $wgLang for the language,
1944          *          so use an IContextSource object if possible.
1945          *        - 'canonical': Canonical options (anonymous user with default
1946          *          preferences and content language).
1947          * @return ParserOptions
1948          */
1949         public function makeParserOptions( $context ) {
1950                 $options = $this->getContentHandler()->makeParserOptions( $context );
1951
1952                 if ( $this->getTitle()->isConversionTable() ) {
1953                         //@todo: ConversionTable should become a separate content model, so we don't need special cases like this one.
1954                         $options->disableContentConversion();
1955                 }
1956
1957                 return $options;
1958         }
1959
1960         /**
1961          * Prepare text which is about to be saved.
1962          * Returns a stdclass with source, pst and output members
1963          *
1964          * @deprecated in 1.21: use prepareContentForEdit instead.
1965          */
1966         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1967                 ContentHandler::deprecated( __METHOD__, '1.21' );
1968                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1969                 return $this->prepareContentForEdit( $content, $revid, $user );
1970         }
1971
1972         /**
1973          * Prepare content which is about to be saved.
1974          * Returns a stdclass with source, pst and output members
1975          *
1976          * @param \Content $content
1977          * @param null $revid
1978          * @param null|\User $user
1979          * @param null $serialization_format
1980          *
1981          * @return bool|object
1982          *
1983          * @since 1.21
1984          */
1985         public function prepareContentForEdit( Content $content, $revid = null, User $user = null, $serialization_format = null ) {
1986                 global $wgContLang, $wgUser;
1987                 $user = is_null( $user ) ? $wgUser : $user;
1988                 //XXX: check $user->getId() here???
1989
1990                 if ( $this->mPreparedEdit
1991                         && $this->mPreparedEdit->newContent
1992                         && $this->mPreparedEdit->newContent->equals( $content )
1993                         && $this->mPreparedEdit->revid == $revid
1994                         && $this->mPreparedEdit->format == $serialization_format
1995                         // XXX: also check $user here?
1996                 ) {
1997                         // Already prepared
1998                         return $this->mPreparedEdit;
1999                 }
2000
2001                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2002                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
2003
2004                 $edit = (object)array();
2005                 $edit->revid = $revid;
2006
2007                 $edit->pstContent = $content ? $content->preSaveTransform( $this->mTitle, $user, $popts ) : null;
2008
2009                 $edit->format = $serialization_format;
2010                 $edit->popts = $this->makeParserOptions( 'canonical' );
2011                 $edit->output = $edit->pstContent ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts ) : null;
2012
2013                 $edit->newContent = $content;
2014                 $edit->oldContent = $this->getContent( Revision::RAW );
2015
2016                 // NOTE: B/C for hooks! don't use these fields!
2017                 $edit->newText = $edit->newContent ? ContentHandler::getContentText( $edit->newContent ) : '';
2018                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
2019                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialization_format ) : '';
2020
2021                 $this->mPreparedEdit = $edit;
2022                 return $edit;
2023         }
2024
2025         /**
2026          * Do standard deferred updates after page edit.
2027          * Update links tables, site stats, search index and message cache.
2028          * Purges pages that include this page if the text was changed here.
2029          * Every 100th edit, prune the recent changes table.
2030          *
2031          * @param $revision Revision object
2032          * @param $user User object that did the revision
2033          * @param array $options of options, following indexes are used:
2034          * - changed: boolean, whether the revision changed the content (default true)
2035          * - created: boolean, whether the revision created the page (default false)
2036          * - oldcountable: boolean or null (default null):
2037          *   - boolean: whether the page was counted as an article before that
2038          *     revision, only used in changed is true and created is false
2039          *   - null: don't change the article count
2040          */
2041         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2042                 global $wgEnableParserCache;
2043
2044                 wfProfileIn( __METHOD__ );
2045
2046                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2047                 $content = $revision->getContent();
2048
2049                 // Parse the text
2050                 // Be careful not to double-PST: $text is usually already PST-ed once
2051                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2052                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2053                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
2054                 } else {
2055                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2056                         $editInfo = $this->mPreparedEdit;
2057                 }
2058
2059                 // Save it to the parser cache
2060                 if ( $wgEnableParserCache ) {
2061                         $parserCache = ParserCache::singleton();
2062                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2063                 }
2064
2065                 // Update the links tables and other secondary data
2066                 if ( $content ) {
2067                         $updates = $content->getSecondaryDataUpdates( $this->getTitle(), null, true, $editInfo->output );
2068                         DataUpdate::runUpdates( $updates );
2069                 }
2070
2071                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2072
2073                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2074                         if ( 0 == mt_rand( 0, 99 ) ) {
2075                                 // Flush old entries from the `recentchanges` table; we do this on
2076                                 // random requests so as to avoid an increase in writes for no good reason
2077                                 global $wgRCMaxAge;
2078
2079                                 $dbw = wfGetDB( DB_MASTER );
2080                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2081                                 $dbw->delete(
2082                                         'recentchanges',
2083                                         array( 'rc_timestamp < ' . $dbw->addQuotes( $cutoff ) ),
2084                                         __METHOD__
2085                                 );
2086                         }
2087                 }
2088
2089                 if ( !$this->exists() ) {
2090                         wfProfileOut( __METHOD__ );
2091                         return;
2092                 }
2093
2094                 $id = $this->getId();
2095                 $title = $this->mTitle->getPrefixedDBkey();
2096                 $shortTitle = $this->mTitle->getDBkey();
2097
2098                 if ( !$options['changed'] ) {
2099                         $good = 0;
2100                         $total = 0;
2101                 } elseif ( $options['created'] ) {
2102                         $good = (int)$this->isCountable( $editInfo );
2103                         $total = 1;
2104                 } elseif ( $options['oldcountable'] !== null ) {
2105                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2106                         $total = 0;
2107                 } else {
2108                         $good = 0;
2109                         $total = 0;
2110                 }
2111
2112                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2113                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content->getTextForSearchIndex() ) );
2114                 // @TODO: let the search engine decide what to do with the content object
2115
2116                 // If this is another user's talk page, update newtalk.
2117                 // Don't do this if $options['changed'] = false (null-edits) nor if
2118                 // it's a minor edit and the user doesn't want notifications for those.
2119                 if ( $options['changed']
2120                         && $this->mTitle->getNamespace() == NS_USER_TALK
2121                         && $shortTitle != $user->getTitleKey()
2122                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2123                 ) {
2124                         if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this ) ) ) {
2125                                 $other = User::newFromName( $shortTitle, false );
2126                                 if ( !$other ) {
2127                                         wfDebug( __METHOD__ . ": invalid username\n" );
2128                                 } elseif ( User::isIP( $shortTitle ) ) {
2129                                         // An anonymous user
2130                                         $other->setNewtalk( true, $revision );
2131                                 } elseif ( $other->isLoggedIn() ) {
2132                                         $other->setNewtalk( true, $revision );
2133                                 } else {
2134                                         wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2135                                 }
2136                         }
2137                 }
2138
2139                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2140                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2141                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2142                         if ( $msgtext === false || $msgtext === null ) $msgtext = '';
2143
2144                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2145                 }
2146
2147                 if( $options['created'] ) {
2148                         self::onArticleCreate( $this->mTitle );
2149                 } else {
2150                         self::onArticleEdit( $this->mTitle );
2151                 }
2152
2153                 wfProfileOut( __METHOD__ );
2154         }
2155
2156         /**
2157          * Edit an article without doing all that other stuff
2158          * The article must already exist; link tables etc
2159          * are not updated, caches are not flushed.
2160          *
2161          * @param string $text text submitted
2162          * @param $user User The relevant user
2163          * @param string $comment comment submitted
2164          * @param $minor Boolean: whereas it's a minor modification
2165          *
2166          * @deprecated since 1.21, use doEditContent() instead.
2167          */
2168         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2169                 ContentHandler::deprecated( __METHOD__, "1.21" );
2170
2171                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2172                 return $this->doQuickEditContent( $content, $user, $comment, $minor );
2173         }
2174
2175         /**
2176          * Edit an article without doing all that other stuff
2177          * The article must already exist; link tables etc
2178          * are not updated, caches are not flushed.
2179          *
2180          * @param $content Content: content submitted
2181          * @param $user User The relevant user
2182          * @param string $comment comment submitted
2183          * @param $serialisation_format String: format for storing the content in the database
2184          * @param $minor Boolean: whereas it's a minor modification
2185          */
2186         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = 0, $serialisation_format = null ) {
2187                 wfProfileIn( __METHOD__ );
2188
2189                 $serialized = $content->serialize( $serialisation_format );
2190
2191                 $dbw = wfGetDB( DB_MASTER );
2192                 $revision = new Revision( array(
2193                         'title'      => $this->getTitle(), // for determining the default content model
2194                         'page'       => $this->getId(),
2195                         'text'       => $serialized,
2196                         'length'     => $content->getSize(),
2197                         'comment'    => $comment,
2198                         'minor_edit' => $minor ? 1 : 0,
2199                 ) ); // XXX: set the content object?
2200                 $revision->insertOn( $dbw );
2201                 $this->updateRevisionOn( $dbw, $revision );
2202
2203                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2204
2205                 wfProfileOut( __METHOD__ );
2206         }
2207
2208         /**
2209          * Update the article's restriction field, and leave a log entry.
2210          * This works for protection both existing and non-existing pages.
2211          *
2212          * @param array $limit set of restriction keys
2213          * @param $reason String
2214          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
2215          * @param array $expiry per restriction type expiration
2216          * @param $user User The user updating the restrictions
2217          * @return Status
2218          */
2219         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
2220                 global $wgContLang;
2221
2222                 if ( wfReadOnly() ) {
2223                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2224                 }
2225
2226                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2227
2228                 $id = $this->getId();
2229
2230                 if ( !$cascade ) {
2231                         $cascade = false;
2232                 }
2233
2234                 // Take this opportunity to purge out expired restrictions
2235                 Title::purgeExpiredRestrictions();
2236
2237                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2238                 // we expect a single selection, but the schema allows otherwise.
2239                 $isProtected = false;
2240                 $protect = false;
2241                 $changed = false;
2242
2243                 $dbw = wfGetDB( DB_MASTER );
2244
2245                 foreach ( $restrictionTypes as $action ) {
2246                         if ( !isset( $expiry[$action] ) ) {
2247                                 $expiry[$action] = $dbw->getInfinity();
2248                         }
2249                         if ( !isset( $limit[$action] ) ) {
2250                                 $limit[$action] = '';
2251                         } elseif ( $limit[$action] != '' ) {
2252                                 $protect = true;
2253                         }
2254
2255                         // Get current restrictions on $action
2256                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2257                         if ( $current != '' ) {
2258                                 $isProtected = true;
2259                         }
2260
2261                         if ( $limit[$action] != $current ) {
2262                                 $changed = true;
2263                         } elseif ( $limit[$action] != '' ) {
2264                                 // Only check expiry change if the action is actually being
2265                                 // protected, since expiry does nothing on an not-protected
2266                                 // action.
2267                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2268                                         $changed = true;
2269                                 }
2270                         }
2271                 }
2272
2273                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2274                         $changed = true;
2275                 }
2276
2277                 // If nothing has changed, do nothing
2278                 if ( !$changed ) {
2279                         return Status::newGood();
2280                 }
2281
2282                 if ( !$protect ) { // No protection at all means unprotection
2283                         $revCommentMsg = 'unprotectedarticle';
2284                         $logAction = 'unprotect';
2285                 } elseif ( $isProtected ) {
2286                         $revCommentMsg = 'modifiedarticleprotection';
2287                         $logAction = 'modify';
2288                 } else {
2289                         $revCommentMsg = 'protectedarticle';
2290                         $logAction = 'protect';
2291                 }
2292
2293                 $encodedExpiry = array();
2294                 $protectDescription = '';
2295                 # Some bots may parse IRC lines, which are generated from log entries which contain plain
2296                 # protect description text. Keep them in old format to avoid breaking compatibility.
2297                 # TODO: Fix protection log to store structured description and format it on-the-fly.
2298                 $protectDescriptionLog = '';
2299                 foreach ( $limit as $action => $restrictions ) {
2300                         $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
2301                         if ( $restrictions != '' ) {
2302                                 $protectDescriptionLog .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
2303                                 # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
2304                                 # All possible message keys are listed here for easier grepping:
2305                                 # * restriction-create
2306                                 # * restriction-edit
2307                                 # * restriction-move
2308                                 # * restriction-upload
2309                                 $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2310                                 # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
2311                                 # with '' filtered out. All possible message keys are listed below:
2312                                 # * protect-level-autoconfirmed
2313                                 # * protect-level-sysop
2314                                 $restrictionsText = wfMessage( 'protect-level-' . $restrictions )->inContentLanguage()->text();
2315                                 if ( $encodedExpiry[$action] != 'infinity' ) {
2316                                         $expiryText = wfMessage(
2317                                                 'protect-expiring',
2318                                                 $wgContLang->timeanddate( $expiry[$action], false, false ),
2319                                                 $wgContLang->date( $expiry[$action], false, false ),
2320                                                 $wgContLang->time( $expiry[$action], false, false )
2321                                         )->inContentLanguage()->text();
2322                                 } else {
2323                                         $expiryText = wfMessage( 'protect-expiry-indefinite' )
2324                                                 ->inContentLanguage()->text();
2325                                 }
2326
2327                                 if ( $protectDescription !== '' ) {
2328                                         $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2329                                 }
2330                                 $protectDescription .= wfMessage( 'protect-summary-desc' )
2331                                         ->params( $actionText, $restrictionsText, $expiryText )
2332                                         ->inContentLanguage()->text();
2333                                 $protectDescriptionLog .= $expiryText . ') ';
2334                         }
2335                 }
2336                 $protectDescriptionLog = trim( $protectDescriptionLog );
2337
2338                 if ( $id ) { // Protection of existing page
2339                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2340                                 return Status::newGood();
2341                         }
2342
2343                         // Only restrictions with the 'protect' right can cascade...
2344                         // Otherwise, people who cannot normally protect can "protect" pages via transclusion
2345                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2346
2347                         // The schema allows multiple restrictions
2348                         if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
2349                                 $cascade = false;
2350                         }
2351
2352                         // Update restrictions table
2353                         foreach ( $limit as $action => $restrictions ) {
2354                                 if ( $restrictions != '' ) {
2355                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2356                                                 array( 'pr_page' => $id,
2357                                                         'pr_type' => $action,
2358                                                         'pr_level' => $restrictions,
2359                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2360                                                         'pr_expiry' => $encodedExpiry[$action]
2361                                                 ),
2362                                                 __METHOD__
2363                                         );
2364                                 } else {
2365                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2366                                                 'pr_type' => $action ), __METHOD__ );
2367                                 }
2368                         }
2369
2370                         // Prepare a null revision to be added to the history
2371                         $editComment = $wgContLang->ucfirst(
2372                                 wfMessage(
2373                                         $revCommentMsg,
2374                                         $this->mTitle->getPrefixedText()
2375                                 )->inContentLanguage()->text()
2376                         );
2377                         if ( $reason ) {
2378                                 $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2379                         }
2380                         if ( $protectDescription ) {
2381                                 $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2382                                 $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )->inContentLanguage()->text();
2383                         }
2384                         if ( $cascade ) {
2385                                 $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2386                                 $editComment .= wfMessage( 'brackets' )->params(
2387                                         wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2388                                 )->inContentLanguage()->text();
2389                         }
2390
2391                         // Insert a null revision
2392                         $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
2393                         $nullRevId = $nullRevision->insertOn( $dbw );
2394
2395                         $latest = $this->getLatest();
2396                         // Update page record
2397                         $dbw->update( 'page',
2398                                 array( /* SET */
2399                                         'page_touched' => $dbw->timestamp(),
2400                                         'page_restrictions' => '',
2401                                         'page_latest' => $nullRevId
2402                                 ), array( /* WHERE */
2403                                         'page_id' => $id
2404                                 ), __METHOD__
2405                         );
2406
2407                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2408                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2409                 } else { // Protection of non-existing page (also known as "title protection")
2410                         // Cascade protection is meaningless in this case
2411                         $cascade = false;
2412
2413                         if ( $limit['create'] != '' ) {
2414                                 $dbw->replace( 'protected_titles',
2415                                         array( array( 'pt_namespace', 'pt_title' ) ),
2416                                         array(
2417                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2418                                                 'pt_title' => $this->mTitle->getDBkey(),
2419                                                 'pt_create_perm' => $limit['create'],
2420                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
2421                                                 'pt_expiry' => $encodedExpiry['create'],
2422                                                 'pt_user' => $user->getId(),
2423                                                 'pt_reason' => $reason,
2424                                         ), __METHOD__
2425                                 );
2426                         } else {
2427                                 $dbw->delete( 'protected_titles',
2428                                         array(
2429                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2430                                                 'pt_title' => $this->mTitle->getDBkey()
2431                                         ), __METHOD__
2432                                 );
2433                         }
2434                 }
2435
2436                 $this->mTitle->flushRestrictions();
2437
2438                 if ( $logAction == 'unprotect' ) {
2439                         $logParams = array();
2440                 } else {
2441                         $logParams = array( $protectDescriptionLog, $cascade ? 'cascade' : '' );
2442                 }
2443
2444                 // Update the protection log
2445                 $log = new LogPage( 'protect' );
2446                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
2447
2448                 return Status::newGood();
2449         }
2450
2451         /**
2452          * Take an array of page restrictions and flatten it to a string
2453          * suitable for insertion into the page_restrictions field.
2454          * @param $limit Array
2455          * @throws MWException
2456          * @return String
2457          */
2458         protected static function flattenRestrictions( $limit ) {
2459                 if ( !is_array( $limit ) ) {
2460                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2461                 }
2462
2463                 $bits = array();
2464                 ksort( $limit );
2465
2466                 foreach ( $limit as $action => $restrictions ) {
2467                         if ( $restrictions != '' ) {
2468                                 $bits[] = "$action=$restrictions";
2469                         }
2470                 }
2471
2472                 return implode( ':', $bits );
2473         }
2474
2475         /**
2476          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2477          * backwards compatibility, if you care about error reporting you should use
2478          * doDeleteArticleReal() instead.
2479          *
2480          * Deletes the article with database consistency, writes logs, purges caches
2481          *
2482          * @param string $reason delete reason for deletion log
2483          * @param $suppress boolean suppress all revisions and log the deletion in
2484          *        the suppression log instead of the deletion log
2485          * @param int $id article ID
2486          * @param $commit boolean defaults to true, triggers transaction end
2487          * @param &$error Array of errors to append to
2488          * @param $user User The deleting user
2489          * @return boolean true if successful
2490          */
2491         public function doDeleteArticle(
2492                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2493         ) {
2494                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2495                 return $status->isGood();
2496         }
2497
2498         /**
2499          * Back-end article deletion
2500          * Deletes the article with database consistency, writes logs, purges caches
2501          *
2502          * @since 1.19
2503          *
2504          * @param string $reason delete reason for deletion log
2505          * @param $suppress boolean suppress all revisions and log the deletion in
2506          *        the suppression log instead of the deletion log
2507          * @param int $id article ID
2508          * @param $commit boolean defaults to true, triggers transaction end
2509          * @param &$error Array of errors to append to
2510          * @param $user User The deleting user
2511          * @return Status: Status object; if successful, $status->value is the log_id of the
2512          *                 deletion log entry. If the page couldn't be deleted because it wasn't
2513          *                 found, $status is a non-fatal 'cannotdelete' error
2514          */
2515         public function doDeleteArticleReal(
2516                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2517         ) {
2518                 global $wgUser, $wgContentHandlerUseDB;
2519
2520                 wfDebug( __METHOD__ . "\n" );
2521
2522                 $status = Status::newGood();
2523
2524                 if ( $this->mTitle->getDBkey() === '' ) {
2525                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2526                         return $status;
2527                 }
2528
2529                 $user = is_null( $user ) ? $wgUser : $user;
2530                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2531                         if ( $status->isOK() ) {
2532                                 // Hook aborted but didn't set a fatal status
2533                                 $status->fatal( 'delete-hook-aborted' );
2534                         }
2535                         return $status;
2536                 }
2537
2538                 if ( $id == 0 ) {
2539                         $this->loadPageData( 'forupdate' );
2540                         $id = $this->getID();
2541                         if ( $id == 0 ) {
2542                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2543                                 return $status;
2544                         }
2545                 }
2546
2547                 // Bitfields to further suppress the content
2548                 if ( $suppress ) {
2549                         $bitfield = 0;
2550                         // This should be 15...
2551                         $bitfield |= Revision::DELETED_TEXT;
2552                         $bitfield |= Revision::DELETED_COMMENT;
2553                         $bitfield |= Revision::DELETED_USER;
2554                         $bitfield |= Revision::DELETED_RESTRICTED;
2555                 } else {
2556                         $bitfield = 'rev_deleted';
2557                 }
2558
2559                 // we need to remember the old content so we can use it to generate all deletion updates.
2560                 $content = $this->getContent( Revision::RAW );
2561
2562                 $dbw = wfGetDB( DB_MASTER );
2563                 $dbw->begin( __METHOD__ );
2564                 // For now, shunt the revision data into the archive table.
2565                 // Text is *not* removed from the text table; bulk storage
2566                 // is left intact to avoid breaking block-compression or
2567                 // immutable storage schemes.
2568                 //
2569                 // For backwards compatibility, note that some older archive
2570                 // table entries will have ar_text and ar_flags fields still.
2571                 //
2572                 // In the future, we may keep revisions and mark them with
2573                 // the rev_deleted field, which is reserved for this purpose.
2574
2575                 $row = array(
2576                         'ar_namespace'  => 'page_namespace',
2577                         'ar_title'      => 'page_title',
2578                         'ar_comment'    => 'rev_comment',
2579                         'ar_user'       => 'rev_user',
2580                         'ar_user_text'  => 'rev_user_text',
2581                         'ar_timestamp'  => 'rev_timestamp',
2582                         'ar_minor_edit' => 'rev_minor_edit',
2583                         'ar_rev_id'     => 'rev_id',
2584                         'ar_parent_id'  => 'rev_parent_id',
2585                         'ar_text_id'    => 'rev_text_id',
2586                         'ar_text'       => '\'\'', // Be explicit to appease
2587                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2588                         'ar_len'        => 'rev_len',
2589                         'ar_page_id'    => 'page_id',
2590                         'ar_deleted'    => $bitfield,
2591                         'ar_sha1'       => 'rev_sha1',
2592                 );
2593
2594                 if ( $wgContentHandlerUseDB ) {
2595                         $row['ar_content_model'] = 'rev_content_model';
2596                         $row['ar_content_format'] = 'rev_content_format';
2597                 }
2598
2599                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2600                         $row,
2601                         array(
2602                                 'page_id' => $id,
2603                                 'page_id = rev_page'
2604                         ), __METHOD__
2605                 );
2606
2607                 // Now that it's safely backed up, delete it
2608                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2609                 $ok = ( $dbw->affectedRows() > 0 ); // $id could be laggy
2610
2611                 if ( !$ok ) {
2612                         $dbw->rollback( __METHOD__ );
2613                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2614                         return $status;
2615                 }
2616
2617                 $this->doDeleteUpdates( $id, $content );
2618
2619                 // Log the deletion, if the page was suppressed, log it at Oversight instead
2620                 $logtype = $suppress ? 'suppress' : 'delete';
2621
2622                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2623                 $logEntry->setPerformer( $user );
2624                 $logEntry->setTarget( $this->mTitle );
2625                 $logEntry->setComment( $reason );
2626                 $logid = $logEntry->insert();
2627                 $logEntry->publish( $logid );
2628
2629                 if ( $commit ) {
2630                         $dbw->commit( __METHOD__ );
2631                 }
2632
2633                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id, $content, $logEntry ) );
2634                 $status->value = $logid;
2635                 return $status;
2636         }
2637
2638         /**
2639          * Do some database updates after deletion
2640          *
2641          * @param int $id page_id value of the page being deleted (B/C, currently unused)
2642          * @param $content Content: optional page content to be used when determining the required updates.
2643          *        This may be needed because $this->getContent() may already return null when the page proper was deleted.
2644          */
2645         public function doDeleteUpdates( $id, Content $content = null ) {
2646                 // update site status
2647                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2648
2649                 // remove secondary indexes, etc
2650                 $updates = $this->getDeletionUpdates( $content );
2651                 DataUpdate::runUpdates( $updates );
2652
2653                 // Clear caches
2654                 WikiPage::onArticleDelete( $this->mTitle );
2655
2656                 // Reset this object and the Title object
2657                 $this->loadFromRow( false, self::READ_LATEST );
2658         }
2659
2660         /**
2661          * Roll back the most recent consecutive set of edits to a page
2662          * from the same user; fails if there are no eligible edits to
2663          * roll back to, e.g. user is the sole contributor. This function
2664          * performs permissions checks on $user, then calls commitRollback()
2665          * to do the dirty work
2666          *
2667          * @todo: separate the business/permission stuff out from backend code
2668          *
2669          * @param string $fromP Name of the user whose edits to rollback.
2670          * @param string $summary Custom summary. Set to default summary if empty.
2671          * @param string $token Rollback token.
2672          * @param $bot Boolean: If true, mark all reverted edits as bot.
2673          *
2674          * @param array $resultDetails contains result-specific array of additional values
2675          *    'alreadyrolled' : 'current' (rev)
2676          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2677          *
2678          * @param $user User The user performing the rollback
2679          * @return array of errors, each error formatted as
2680          *   array(messagekey, param1, param2, ...).
2681          * On success, the array is empty.  This array can also be passed to
2682          * OutputPage::showPermissionsErrorPage().
2683          */
2684         public function doRollback(
2685                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2686         ) {
2687                 $resultDetails = null;
2688
2689                 // Check permissions
2690                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2691                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2692                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2693
2694                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2695                         $errors[] = array( 'sessionfailure' );
2696                 }
2697
2698                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2699                         $errors[] = array( 'actionthrottledtext' );
2700                 }
2701
2702                 // If there were errors, bail out now
2703                 if ( !empty( $errors ) ) {
2704                         return $errors;
2705                 }
2706
2707                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2708         }
2709
2710         /**
2711          * Backend implementation of doRollback(), please refer there for parameter
2712          * and return value documentation
2713          *
2714          * NOTE: This function does NOT check ANY permissions, it just commits the
2715          * rollback to the DB. Therefore, you should only call this function direct-
2716          * ly if you want to use custom permissions checks. If you don't, use
2717          * doRollback() instead.
2718          * @param string $fromP Name of the user whose edits to rollback.
2719          * @param string $summary Custom summary. Set to default summary if empty.
2720          * @param $bot Boolean: If true, mark all reverted edits as bot.
2721          *
2722          * @param array $resultDetails contains result-specific array of additional values
2723          * @param $guser User The user performing the rollback
2724          * @return array
2725          */
2726         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2727                 global $wgUseRCPatrol, $wgContLang;
2728
2729                 $dbw = wfGetDB( DB_MASTER );
2730
2731                 if ( wfReadOnly() ) {
2732                         return array( array( 'readonlytext' ) );
2733                 }
2734
2735                 // Get the last editor
2736                 $current = $this->getRevision();
2737                 if ( is_null( $current ) ) {
2738                         // Something wrong... no page?
2739                         return array( array( 'notanarticle' ) );
2740                 }
2741
2742                 $from = str_replace( '_', ' ', $fromP );
2743                 // User name given should match up with the top revision.
2744                 // If the user was deleted then $from should be empty.
2745                 if ( $from != $current->getUserText() ) {
2746                         $resultDetails = array( 'current' => $current );
2747                         return array( array( 'alreadyrolled',
2748                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2749                                 htmlspecialchars( $fromP ),
2750                                 htmlspecialchars( $current->getUserText() )
2751                         ) );
2752                 }
2753
2754                 // Get the last edit not by this guy...
2755                 // Note: these may not be public values
2756                 $user = intval( $current->getRawUser() );
2757                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2758                 $s = $dbw->selectRow( 'revision',
2759                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2760                         array( 'rev_page' => $current->getPage(),
2761                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2762                         ), __METHOD__,
2763                         array( 'USE INDEX' => 'page_timestamp',
2764                                 'ORDER BY' => 'rev_timestamp DESC' )
2765                         );
2766                 if ( $s === false ) {
2767                         // No one else ever edited this page
2768                         return array( array( 'cantrollback' ) );
2769                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2770                         // Only admins can see this text
2771                         return array( array( 'notvisiblerev' ) );
2772                 }
2773
2774                 $set = array();
2775                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2776                         // Mark all reverted edits as bot
2777                         $set['rc_bot'] = 1;
2778                 }
2779
2780                 if ( $wgUseRCPatrol ) {
2781                         // Mark all reverted edits as patrolled
2782                         $set['rc_patrolled'] = 1;
2783                 }
2784
2785                 if ( count( $set ) ) {
2786                         $dbw->update( 'recentchanges', $set,
2787                                 array( /* WHERE */
2788                                         'rc_cur_id' => $current->getPage(),
2789                                         'rc_user_text' => $current->getUserText(),
2790                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
2791                                 ), __METHOD__
2792                         );
2793                 }
2794
2795                 // Generate the edit summary if necessary
2796                 $target = Revision::newFromId( $s->rev_id );
2797                 if ( empty( $summary ) ) {
2798                         if ( $from == '' ) { // no public user name
2799                                 $summary = wfMessage( 'revertpage-nouser' );
2800                         } else {
2801                                 $summary = wfMessage( 'revertpage' );
2802                         }
2803                 }
2804
2805                 // Allow the custom summary to use the same args as the default message
2806                 $args = array(
2807                         $target->getUserText(), $from, $s->rev_id,
2808                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2809                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2810                 );
2811                 if( $summary instanceof Message ) {
2812                         $summary = $summary->params( $args )->inContentLanguage()->text();
2813                 } else {
2814                         $summary = wfMsgReplaceArgs( $summary, $args );
2815                 }
2816
2817                 // Trim spaces on user supplied text
2818                 $summary = trim( $summary );
2819
2820                 // Truncate for whole multibyte characters.
2821                 $summary = $wgContLang->truncate( $summary, 255 );
2822
2823                 // Save
2824                 $flags = EDIT_UPDATE;
2825
2826                 if ( $guser->isAllowed( 'minoredit' ) ) {
2827                         $flags |= EDIT_MINOR;
2828                 }
2829
2830                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2831                         $flags |= EDIT_FORCE_BOT;
2832                 }
2833
2834                 // Actually store the edit
2835                 $status = $this->doEditContent( $target->getContent(), $summary, $flags, $target->getId(), $guser );
2836
2837                 if ( !$status->isOK() ) {
2838                         return $status->getErrorsArray();
2839                 }
2840
2841                 if ( !empty( $status->value['revision'] ) ) {
2842                         $revId = $status->value['revision']->getId();
2843                 } else {
2844                         $revId = false;
2845                 }
2846
2847                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2848
2849                 $resultDetails = array(
2850                         'summary' => $summary,
2851                         'current' => $current,
2852                         'target'  => $target,
2853                         'newid'   => $revId
2854                 );
2855
2856                 return array();
2857         }
2858
2859         /**
2860          * The onArticle*() functions are supposed to be a kind of hooks
2861          * which should be called whenever any of the specified actions
2862          * are done.
2863          *
2864          * This is a good place to put code to clear caches, for instance.
2865          *
2866          * This is called on page move and undelete, as well as edit
2867          *
2868          * @param $title Title object
2869          */
2870         public static function onArticleCreate( $title ) {
2871                 // Update existence markers on article/talk tabs...
2872                 if ( $title->isTalkPage() ) {
2873                         $other = $title->getSubjectPage();
2874                 } else {
2875                         $other = $title->getTalkPage();
2876                 }
2877
2878                 $other->invalidateCache();
2879                 $other->purgeSquid();
2880
2881                 $title->touchLinks();
2882                 $title->purgeSquid();
2883                 $title->deleteTitleProtection();
2884         }
2885
2886         /**
2887          * Clears caches when article is deleted
2888          *
2889          * @param $title Title
2890          */
2891         public static function onArticleDelete( $title ) {
2892                 // Update existence markers on article/talk tabs...
2893                 if ( $title->isTalkPage() ) {
2894                         $other = $title->getSubjectPage();
2895                 } else {
2896                         $other = $title->getTalkPage();
2897                 }
2898
2899                 $other->invalidateCache();
2900                 $other->purgeSquid();
2901
2902                 $title->touchLinks();
2903                 $title->purgeSquid();
2904
2905                 // File cache
2906                 HTMLFileCache::clearFileCache( $title );
2907
2908                 // Messages
2909                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
2910                         MessageCache::singleton()->replace( $title->getDBkey(), false );
2911                 }
2912
2913                 // Images
2914                 if ( $title->getNamespace() == NS_FILE ) {
2915                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
2916                         $update->doUpdate();
2917                 }
2918
2919                 // User talk pages
2920                 if ( $title->getNamespace() == NS_USER_TALK ) {
2921                         $user = User::newFromName( $title->getText(), false );
2922                         if ( $user ) {
2923                                 $user->setNewtalk( false );
2924                         }
2925                 }
2926
2927                 // Image redirects
2928                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
2929         }
2930
2931         /**
2932          * Purge caches on page update etc
2933          *
2934          * @param $title Title object
2935          * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
2936          */
2937         public static function onArticleEdit( $title ) {
2938                 // Invalidate caches of articles which include this page
2939                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
2940
2941                 // Invalidate the caches of all pages which redirect here
2942                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
2943
2944                 // Purge squid for this page only
2945                 $title->purgeSquid();
2946
2947                 // Clear file cache for this page only
2948                 HTMLFileCache::clearFileCache( $title );
2949         }
2950
2951         /**#@-*/
2952
2953         /**
2954          * Returns a list of hidden categories this page is a member of.
2955          * Uses the page_props and categorylinks tables.
2956          *
2957          * @return Array of Title objects
2958          */
2959         public function getHiddenCategories() {
2960                 $result = array();
2961                 $id = $this->getId();
2962
2963                 if ( $id == 0 ) {
2964                         return array();
2965                 }
2966
2967                 $dbr = wfGetDB( DB_SLAVE );
2968                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
2969                         array( 'cl_to' ),
2970                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
2971                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
2972                         __METHOD__ );
2973
2974                 if ( $res !== false ) {
2975                         foreach ( $res as $row ) {
2976                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
2977                         }
2978                 }
2979
2980                 return $result;
2981         }
2982
2983         /**
2984          * Return an applicable autosummary if one exists for the given edit.
2985          * @param string|null $oldtext the previous text of the page.
2986          * @param string|null $newtext The submitted text of the page.
2987          * @param int $flags bitmask: a bitmask of flags submitted for the edit.
2988          * @return string An appropriate autosummary, or an empty string.
2989          *
2990          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2991          */
2992         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2993                 // NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
2994
2995                 ContentHandler::deprecated( __METHOD__, '1.21' );
2996
2997                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
2998                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
2999                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3000
3001                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3002         }
3003
3004         /**
3005          * Auto-generates a deletion reason
3006          *
3007          * @param &$hasHistory Boolean: whether the page has a history
3008          * @return mixed String containing deletion reason or empty string, or boolean false
3009          *    if no revision occurred
3010          */
3011         public function getAutoDeleteReason( &$hasHistory ) {
3012                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3013         }
3014
3015         /**
3016          * Update all the appropriate counts in the category table, given that
3017          * we've added the categories $added and deleted the categories $deleted.
3018          *
3019          * @param array $added   The names of categories that were added
3020          * @param array $deleted The names of categories that were deleted
3021          */
3022         public function updateCategoryCounts( array $added, array $deleted ) {
3023                 $that = $this;
3024                 $method = __METHOD__;
3025                 $dbw = wfGetDB( DB_MASTER );
3026
3027                 // Do this at the end of the commit to reduce lock wait timeouts
3028                 $dbw->onTransactionPreCommitOrIdle(
3029                         function() use ( $dbw, $that, $method, $added, $deleted ) {
3030                                 $ns = $that->getTitle()->getNamespace();
3031
3032                                 // First make sure the rows exist.  If one of the "deleted" ones didn't
3033                                 // exist, we might legitimately not create it, but it's simpler to just
3034                                 // create it and then give it a negative value, since the value is bogus
3035                                 // anyway.
3036                                 //
3037                                 // Sometimes I wish we had INSERT ... ON DUPLICATE KEY UPDATE.
3038                                 $insertCats = array_merge( $added, $deleted );
3039                                 if ( !$insertCats ) {
3040                                         // Okay, nothing to do
3041                                         return;
3042                                 }
3043
3044                                 $insertRows = array();
3045                                 foreach ( $insertCats as $cat ) {
3046                                         $insertRows[] = array(
3047                                                 'cat_id' => $dbw->nextSequenceValue( 'category_cat_id_seq' ),
3048                                                 'cat_title' => $cat
3049                                         );
3050                                 }
3051                                 $dbw->insert( 'category', $insertRows, $method, 'IGNORE' );
3052
3053                                 $addFields = array( 'cat_pages = cat_pages + 1' );
3054                                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3055
3056                                 if ( $ns == NS_CATEGORY ) {
3057                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3058                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3059                                 } elseif ( $ns == NS_FILE ) {
3060                                         $addFields[] = 'cat_files = cat_files + 1';
3061                                         $removeFields[] = 'cat_files = cat_files - 1';
3062                                 }
3063
3064                                 if ( $added ) {
3065                                         $dbw->update(
3066                                                 'category',
3067                                                 $addFields,
3068                                                 array( 'cat_title' => $added ),
3069                                                 $method
3070                                         );
3071                                 }
3072
3073                                 if ( $deleted ) {
3074                                         $dbw->update(
3075                                                 'category',
3076                                                 $removeFields,
3077                                                 array( 'cat_title' => $deleted ),
3078                                                 $method
3079                                         );
3080                                 }
3081
3082                                 foreach( $added as $catName ) {
3083                                         $cat = Category::newFromName( $catName );
3084                                         wfRunHooks( 'CategoryAfterPageAdded', array( $cat, $that ) );
3085                                 }
3086                                 foreach( $deleted as $catName ) {
3087                                         $cat = Category::newFromName( $catName );
3088                                         wfRunHooks( 'CategoryAfterPageRemoved', array( $cat, $that ) );
3089                                 }
3090                         }
3091                 );
3092         }
3093
3094         /**
3095          * Updates cascading protections
3096          *
3097          * @param $parserOutput ParserOutput object for the current version
3098          */
3099         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
3100                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
3101                         return;
3102                 }
3103
3104                 // templatelinks table may have become out of sync,
3105                 // especially if using variable-based transclusions.
3106                 // For paranoia, check if things have changed and if
3107                 // so apply updates to the database. This will ensure
3108                 // that cascaded protections apply as soon as the changes
3109                 // are visible.
3110
3111                 // Get templates from templatelinks
3112                 $id = $this->getId();
3113
3114                 $tlTemplates = array();
3115
3116                 $dbr = wfGetDB( DB_SLAVE );
3117                 $res = $dbr->select( array( 'templatelinks' ),
3118                         array( 'tl_namespace', 'tl_title' ),
3119                         array( 'tl_from' => $id ),
3120                         __METHOD__
3121                 );
3122
3123                 foreach ( $res as $row ) {
3124                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3125                 }
3126
3127                 // Get templates from parser output.
3128                 $poTemplates = array();
3129                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3130                         foreach ( $templates as $dbk => $id ) {
3131                                 $poTemplates["$ns:$dbk"] = true;
3132                         }
3133                 }
3134
3135                 // Get the diff
3136                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3137
3138                 if ( count( $templates_diff ) > 0 ) {
3139                         // Whee, link updates time.
3140                         // Note: we are only interested in links here. We don't need to get other DataUpdate items from the parser output.
3141                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3142                         $u->doUpdate();
3143                 }
3144         }
3145
3146         /**
3147          * Return a list of templates used by this article.
3148          * Uses the templatelinks table
3149          *
3150          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
3151          * @return Array of Title objects
3152          */
3153         public function getUsedTemplates() {
3154                 return $this->mTitle->getTemplateLinksFrom();
3155         }
3156
3157         /**
3158          * Perform article updates on a special page creation.
3159          *
3160          * @param $rev Revision object
3161          *
3162          * @todo This is a shitty interface function. Kill it and replace the
3163          * other shitty functions like doEditUpdates and such so it's not needed
3164          * anymore.
3165          * @deprecated since 1.18, use doEditUpdates()
3166          */
3167         public function createUpdates( $rev ) {
3168                 wfDeprecated( __METHOD__, '1.18' );
3169                 global $wgUser;
3170                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
3171         }
3172
3173         /**
3174          * This function is called right before saving the wikitext,
3175          * so we can do things like signatures and links-in-context.
3176          *
3177          * @deprecated in 1.19; use Parser::preSaveTransform() instead
3178          * @param string $text article contents
3179          * @param $user User object: user doing the edit
3180          * @param $popts ParserOptions object: parser options, default options for
3181          *               the user loaded if null given
3182          * @return string article contents with altered wikitext markup (signatures
3183          *      converted, {{subst:}}, templates, etc.)
3184          */
3185         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3186                 global $wgParser, $wgUser;
3187
3188                 wfDeprecated( __METHOD__, '1.19' );
3189
3190                 $user = is_null( $user ) ? $wgUser : $user;
3191
3192                 if ( $popts === null ) {
3193                         $popts = ParserOptions::newFromUser( $user );
3194                 }
3195
3196                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3197         }
3198
3199         /**
3200          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
3201          *
3202          * @deprecated in 1.19; use Title::isBigDeletion() instead.
3203          * @return bool
3204          */
3205         public function isBigDeletion() {
3206                 wfDeprecated( __METHOD__, '1.19' );
3207                 return $this->mTitle->isBigDeletion();
3208         }
3209
3210         /**
3211          * Get the  approximate revision count of this page.
3212          *
3213          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
3214          * @return int
3215          */
3216         public function estimateRevisionCount() {
3217                 wfDeprecated( __METHOD__, '1.19' );
3218                 return $this->mTitle->estimateRevisionCount();
3219         }
3220
3221         /**
3222          * Update the article's restriction field, and leave a log entry.
3223          *
3224          * @deprecated since 1.19
3225          * @param array $limit set of restriction keys
3226          * @param $reason String
3227          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
3228          * @param array $expiry per restriction type expiration
3229          * @param $user User The user updating the restrictions
3230          * @return bool true on success
3231          */
3232         public function updateRestrictions(
3233                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3234         ) {
3235                 global $wgUser;
3236
3237                 $user = is_null( $user ) ? $wgUser : $user;
3238
3239                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3240         }
3241
3242         /**
3243          * @deprecated since 1.18
3244          */
3245         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3246                 wfDeprecated( __METHOD__, '1.18' );
3247                 global $wgUser;
3248                 $this->doQuickEdit( $text, $wgUser, $comment, $minor );
3249         }
3250
3251         /**
3252          * @deprecated since 1.18
3253          */
3254         public function viewUpdates() {
3255                 wfDeprecated( __METHOD__, '1.18' );
3256                 global $wgUser;
3257                 return $this->doViewUpdates( $wgUser );
3258         }
3259
3260         /**
3261          * @deprecated since 1.18
3262          * @param $oldid int
3263          * @return bool
3264          */
3265         public function useParserCache( $oldid ) {
3266                 wfDeprecated( __METHOD__, '1.18' );
3267                 global $wgUser;
3268                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
3269         }
3270
3271         /**
3272          * Returns a list of updates to be performed when this page is deleted. The updates should remove any information
3273          * about this page from secondary data stores such as links tables.
3274          *
3275          * @param Content|null $content optional Content object for determining the necessary updates
3276          * @return Array an array of DataUpdates objects
3277          */
3278         public function getDeletionUpdates( Content $content = null ) {
3279                 if ( !$content ) {
3280                         // load content object, which may be used to determine the necessary updates
3281                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3282                         $content = $this->getContent( Revision::RAW );
3283                 }
3284
3285                 if ( !$content ) {
3286                         $updates = array();
3287                 } else {
3288                         $updates = $content->getDeletionUpdates( $this );
3289                 }
3290
3291                 wfRunHooks( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3292                 return $updates;
3293         }
3294
3295 }
3296
3297 class PoolWorkArticleView extends PoolCounterWork {
3298
3299         /**
3300          * @var Page
3301          */
3302         private $page;
3303
3304         /**
3305          * @var string
3306          */
3307         private $cacheKey;
3308
3309         /**
3310          * @var integer
3311          */
3312         private $revid;
3313
3314         /**
3315          * @var ParserOptions
3316          */
3317         private $parserOptions;
3318
3319         /**
3320          * @var Content|null
3321          */
3322         private $content = null;
3323
3324         /**
3325          * @var ParserOutput|bool
3326          */
3327         private $parserOutput = false;
3328
3329         /**
3330          * @var bool
3331          */
3332         private $isDirty = false;
3333
3334         /**
3335          * @var Status|bool
3336          */
3337         private $error = false;
3338
3339         /**
3340          * Constructor
3341          *
3342          * @param $page Page
3343          * @param $revid Integer: ID of the revision being parsed
3344          * @param $useParserCache Boolean: whether to use the parser cache
3345          * @param $parserOptions parserOptions to use for the parse operation
3346          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
3347          */
3348         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null ) {
3349                 if ( is_string( $content ) ) { // BC: old style call
3350                         $modelId = $page->getRevision()->getContentModel();
3351                         $format = $page->getRevision()->getContentFormat();
3352                         $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelId, $format );
3353                 }
3354
3355                 $this->page = $page;
3356                 $this->revid = $revid;
3357                 $this->cacheable = $useParserCache;
3358                 $this->parserOptions = $parserOptions;
3359                 $this->content = $content;
3360                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3361                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3362         }
3363
3364         /**
3365          * Get the ParserOutput from this object, or false in case of failure
3366          *
3367          * @return ParserOutput
3368          */
3369         public function getParserOutput() {
3370                 return $this->parserOutput;
3371         }
3372
3373         /**
3374          * Get whether the ParserOutput is a dirty one (i.e. expired)
3375          *
3376          * @return bool
3377          */
3378         public function getIsDirty() {
3379                 return $this->isDirty;
3380         }
3381
3382         /**
3383          * Get a Status object in case of error or false otherwise
3384          *
3385          * @return Status|bool
3386          */
3387         public function getError() {
3388                 return $this->error;
3389         }
3390
3391         /**
3392          * @return bool
3393          */
3394         function doWork() {
3395                 global $wgUseFileCache;
3396
3397                 // @todo: several of the methods called on $this->page are not declared in Page, but present
3398                 //        in WikiPage and delegated by Article.
3399
3400                 $isCurrent = $this->revid === $this->page->getLatest();
3401
3402                 if ( $this->content !== null ) {
3403                         $content = $this->content;
3404                 } elseif ( $isCurrent ) {
3405                         // XXX: why use RAW audience here, and PUBLIC (default) below?
3406                         $content = $this->page->getContent( Revision::RAW );
3407                 } else {
3408                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3409
3410                         if ( $rev === null ) {
3411                                 $content = null;
3412                         } else {
3413                                 // XXX: why use PUBLIC audience here (default), and RAW above?
3414                                 $content = $rev->getContent();
3415                         }
3416                 }
3417
3418                 if ( $content === null ) {
3419                         return false;
3420                 }
3421
3422                 $time = - microtime( true );
3423                 $this->parserOutput = $content->getParserOutput( $this->page->getTitle(), $this->revid, $this->parserOptions );
3424                 $time += microtime( true );
3425
3426                 // Timing hack
3427                 if ( $time > 3 ) {
3428                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3429                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3430                 }
3431
3432                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
3433                         ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
3434                 }
3435
3436                 // Make sure file cache is not used on uncacheable content.
3437                 // Output that has magic words in it can still use the parser cache
3438                 // (if enabled), though it will generally expire sooner.
3439                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3440                         $wgUseFileCache = false;
3441                 }
3442
3443                 if ( $isCurrent ) {
3444                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3445                 }
3446
3447                 return true;
3448         }
3449
3450         /**
3451          * @return bool
3452          */
3453         function getCachedWork() {
3454                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3455
3456                 if ( $this->parserOutput === false ) {
3457                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3458                         return false;
3459                 } else {
3460                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3461                         return true;
3462                 }
3463         }
3464
3465         /**
3466          * @return bool
3467          */
3468         function fallback() {
3469                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3470
3471                 if ( $this->parserOutput === false ) {
3472                         wfDebugLog( 'dirty', "dirty missing\n" );
3473                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3474                         return false;
3475                 } else {
3476                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3477                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
3478                         $this->isDirty = true;
3479                         return true;
3480                 }
3481         }
3482
3483         /**
3484          * @param $status Status
3485          * @return bool
3486          */
3487         function error( $status ) {
3488                 $this->error = $status;
3489                 return false;
3490         }
3491 }