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 /**
  30  * Class representing a MediaWiki article and history.
  31  *
  32  * Some fields are public only for backwards-compatibility. Use accessors.
  33  * In the past, this class was part of Article.php and everything was public.
  34  *
  35  * @internal documentation reviewed 15 Mar 2010
  36  */
  37 class WikiPage implements Page, IDBAccessObject {
  38         // Constants for $mDataLoadedFrom and related
  39
  40         /**
  41          * @var Title
  42          */
  43         public $mTitle = null;
  44
  45         /**@{{
  46          * @protected
  47          */
  48         public $mDataLoaded = false;         // !< Boolean
  49         public $mIsRedirect = false;         // !< Boolean
  50         public $mLatest = false;             // !< Integer (false means "not loaded")
  51         /**@}}*/
  52
  53         /** @var stdclass Map of cache fields (text, parser output, ect) for a proposed/new edit */
  54         protected $mPreparedEdit = false;
  55
  56         /**
  57          * @var int
  58          */
  59         protected $mId = null;
  60
  61         /**
  62          * @var int; one of the READ_* constants
  63          */
  64         protected $mDataLoadedFrom = self::READ_NONE;
  65
  66         /**
  67          * @var Title
  68          */
  69         protected $mRedirectTarget = null;
  70
  71         /**
  72          * @var Revision
  73          */
  74         protected $mLastRevision = null;
  75
  76         /**
  77          * @var string; timestamp of the current revision or empty string if not loaded
  78          */
  79         protected $mTimestamp = '';
  80
  81         /**
  82          * @var string
  83          */
  84         protected $mTouched = '19700101000000';
  85
  86         /**
  87          * @var int|null
  88          */
  89         protected $mCounter = null;
  90
  91         /**
  92          * Constructor and clear the article
  93          * @param $title Title Reference to a Title object.
  94          */
  95         public function __construct( Title $title ) {
  96                 $this->mTitle = $title;
  97         }
  98
  99         /**
 100          * Create a WikiPage object of the appropriate class for the given title.
 101          *
 102          * @param $title Title
 103          * @throws MWException
 104          * @return WikiPage object of the appropriate type
 105          */
 106         public static function factory( Title $title ) {
 107                 $ns = $title->getNamespace();
 108
 109                 if ( $ns == NS_MEDIA ) {
 110                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 111                 } elseif ( $ns < 0 ) {
 112                         throw new MWException( "Invalid or virtual namespace $ns given." );
 113                 }
 114
 115                 switch ( $ns ) {
 116                         case NS_FILE:
 117                                 $page = new WikiFilePage( $title );
 118                                 break;
 119                         case NS_CATEGORY:
 120                                 $page = new WikiCategoryPage( $title );
 121                                 break;
 122                         default:
 123                                 $page = new WikiPage( $title );
 124                 }
 125
 126                 return $page;
 127         }
 128
 129         /**
 130          * Constructor from a page id
 131          *
 132          * @param int $id article ID to load
 133          * @param string|int $from one of the following values:
 134          *        - "fromdb" or WikiPage::READ_NORMAL to select from a slave database
 135          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 136          *
 137          * @return WikiPage|null
 138          */
 139         public static function newFromID( $id, $from = 'fromdb' ) {
 140                 $from = self::convertSelectType( $from );
 141                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_SLAVE );
 142                 $row = $db->selectRow( 'page', self::selectFields(), array( 'page_id' => $id ), __METHOD__ );
 143                 if ( !$row ) {
 144                         return null;
 145                 }
 146                 return self::newFromRow( $row, $from );
 147         }
 148
 149         /**
 150          * Constructor from a database row
 151          *
 152          * @since 1.20
 153          * @param $row object: database row containing at least fields returned
 154          *        by selectFields().
 155          * @param string|int $from source of $data:
 156          *        - "fromdb" or WikiPage::READ_NORMAL: from a slave DB
 157          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 158          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 159          * @return WikiPage
 160          */
 161         public static function newFromRow( $row, $from = 'fromdb' ) {
 162                 $page = self::factory( Title::newFromRow( $row ) );
 163                 $page->loadFromRow( $row, $from );
 164                 return $page;
 165         }
 166
 167         /**
 168          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 169          *
 170          * @param $type object|string|int
 171          * @return mixed
 172          */
 173         private static function convertSelectType( $type ) {
 174                 switch ( $type ) {
 175                 case 'fromdb':
 176                         return self::READ_NORMAL;
 177                 case 'fromdbmaster':
 178                         return self::READ_LATEST;
 179                 case 'forupdate':
 180                         return self::READ_LOCKING;
 181                 default:
 182                         // It may already be an integer or whatever else
 183                         return $type;
 184                 }
 185         }
 186
 187         /**
 188          * Returns overrides for action handlers.
 189          * Classes listed here will be used instead of the default one when
 190          * (and only when) $wgActions[$action] === true. This allows subclasses
 191          * to override the default behavior.
 192          *
 193          * @todo Move this UI stuff somewhere else
 194          *
 195          * @return Array
 196          */
 197         public function getActionOverrides() {
 198                 $content_handler = $this->getContentHandler();
 199                 return $content_handler->getActionOverrides();
 200         }
 201
 202         /**
 203          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 204          *
 205          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 206          *
 207          * @return ContentHandler
 208          *
 209          * @since 1.21
 210          */
 211         public function getContentHandler() {
 212                 return ContentHandler::getForModelID( $this->getContentModel() );
 213         }
 214
 215         /**
 216          * Get the title object of the article
 217          * @return Title object of this page
 218          */
 219         public function getTitle() {
 220                 return $this->mTitle;
 221         }
 222
 223         /**
 224          * Clear the object
 225          * @return void
 226          */
 227         public function clear() {
 228                 $this->mDataLoaded = false;
 229                 $this->mDataLoadedFrom = self::READ_NONE;
 230
 231                 $this->clearCacheFields();
 232         }
 233
 234         /**
 235          * Clear the object cache fields
 236          * @return void
 237          */
 238         protected function clearCacheFields() {
 239                 $this->mId = null;
 240                 $this->mCounter = null;
 241                 $this->mRedirectTarget = null; // Title object if set
 242                 $this->mLastRevision = null; // Latest revision
 243                 $this->mTouched = '19700101000000';
 244                 $this->mTimestamp = '';
 245                 $this->mIsRedirect = false;
 246                 $this->mLatest = false;
 247                 // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 248                 // the requested rev ID and content against the cached one for equality. For most
 249                 // content types, the output should not change during the lifetime of this cache.
 250                 // Clearing it can cause extra parses on edit for no reason.
 251         }
 252
 253         /**
 254          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 255          * @return void
 256          * @since 1.23
 257          */
 258         public function clearPreparedEdit() {
 259                 $this->mPreparedEdit = false;
 260         }
 261
 262         /**
 263          * Return the list of revision fields that should be selected to create
 264          * a new page.
 265          *
 266          * @return array
 267          */
 268         public static function selectFields() {
 269                 global $wgContentHandlerUseDB;
 270
 271                 $fields = array(
 272                         'page_id',
 273                         'page_namespace',
 274                         'page_title',
 275                         'page_restrictions',
 276                         'page_counter',
 277                         'page_is_redirect',
 278                         'page_is_new',
 279                         'page_random',
 280                         'page_touched',
 281                         'page_latest',
 282                         'page_len',
 283                 );
 284
 285                 if ( $wgContentHandlerUseDB ) {
 286                         $fields[] = 'page_content_model';
 287                 }
 288
 289                 return $fields;
 290         }
 291
 292         /**
 293          * Fetch a page record with the given conditions
 294          * @param $dbr DatabaseBase object
 295          * @param $conditions Array
 296          * @param $options Array
 297          * @return mixed Database result resource, or false on failure
 298          */
 299         protected function pageData( $dbr, $conditions, $options = array() ) {
 300                 $fields = self::selectFields();
 301
 302                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 303
 304                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 305
 306                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 307
 308                 return $row;
 309         }
 310
 311         /**
 312          * Fetch a page record matching the Title object's namespace and title
 313          * using a sanitized title string
 314          *
 315          * @param $dbr DatabaseBase object
 316          * @param $title Title object
 317          * @param $options Array
 318          * @return mixed Database result resource, or false on failure
 319          */
 320         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 321                 return $this->pageData( $dbr, array(
 322                         'page_namespace' => $title->getNamespace(),
 323                         'page_title' => $title->getDBkey() ), $options );
 324         }
 325
 326         /**
 327          * Fetch a page record matching the requested ID
 328          *
 329          * @param $dbr DatabaseBase
 330          * @param $id Integer
 331          * @param $options Array
 332          * @return mixed Database result resource, or false on failure
 333          */
 334         public function pageDataFromId( $dbr, $id, $options = array() ) {
 335                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 336         }
 337
 338         /**
 339          * Set the general counter, title etc data loaded from
 340          * some source.
 341          *
 342          * @param $from object|string|int One of the following:
 343          *        - A DB query result object
 344          *        - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB
 345          *        - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB
 346          *        - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB using SELECT FOR UPDATE
 347          *
 348          * @return void
 349          */
 350         public function loadPageData( $from = 'fromdb' ) {
 351                 $from = self::convertSelectType( $from );
 352                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 353                         // We already have the data from the correct location, no need to load it twice.
 354                         return;
 355                 }
 356
 357                 if ( $from === self::READ_LOCKING ) {
 358                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 359                 } elseif ( $from === self::READ_LATEST ) {
 360                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 361                 } elseif ( $from === self::READ_NORMAL ) {
 362                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 363                         // Use a "last rev inserted" timestamp key to diminish the issue of slave lag.
 364                         // Note that DB also stores the master position in the session and checks it.
 365                         $touched = $this->getCachedLastEditTime();
 366                         if ( $touched ) { // key set
 367                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 368                                         $from = self::READ_LATEST;
 369                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 370                                 }
 371                         }
 372                 } else {
 373                         // No idea from where the caller got this data, assume slave database.
 374                         $data = $from;
 375                         $from = self::READ_NORMAL;
 376                 }
 377
 378                 $this->loadFromRow( $data, $from );
 379         }
 380
 381         /**
 382          * Load the object from a database row
 383          *
 384          * @since 1.20
 385          * @param $data object: database row containing at least fields returned
 386          *        by selectFields()
 387          * @param string|int $from One of the following:
 388          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 389          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 390          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from from
 391          *          the master DB using SELECT FOR UPDATE
 392          */
 393         public function loadFromRow( $data, $from ) {
 394                 $lc = LinkCache::singleton();
 395                 $lc->clearLink( $this->mTitle );
 396
 397                 if ( $data ) {
 398                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 399
 400                         $this->mTitle->loadFromRow( $data );
 401
 402                         // Old-fashioned restrictions
 403                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 404
 405                         $this->mId = intval( $data->page_id );
 406                         $this->mCounter = intval( $data->page_counter );
 407                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 408                         $this->mIsRedirect = intval( $data->page_is_redirect );
 409                         $this->mLatest = intval( $data->page_latest );
 410                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 411                         // Double-check the ID of any cached latest Revision object for consistency.
 412                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 413                                 $this->mLastRevision = null;
 414                                 $this->mTimestamp = '';
 415                         }
 416                 } else {
 417                         $lc->addBadLinkObj( $this->mTitle );
 418
 419                         $this->mTitle->loadFromRow( false );
 420
 421                         $this->clearCacheFields();
 422
 423                         $this->mId = 0;
 424                 }
 425
 426                 $this->mDataLoaded = true;
 427                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 428         }
 429
 430         /**
 431          * @return int Page ID
 432          */
 433         public function getId() {
 434                 if ( !$this->mDataLoaded ) {
 435                         $this->loadPageData();
 436                 }
 437                 return $this->mId;
 438         }
 439
 440         /**
 441          * @return bool Whether or not the page exists in the database
 442          */
 443         public function exists() {
 444                 if ( !$this->mDataLoaded ) {
 445                         $this->loadPageData();
 446                 }
 447                 return $this->mId > 0;
 448         }
 449
 450         /**
 451          * Check if this page is something we're going to be showing
 452          * some sort of sensible content for. If we return false, page
 453          * views (plain action=view) will return an HTTP 404 response,
 454          * so spiders and robots can know they're following a bad link.
 455          *
 456          * @return bool
 457          */
 458         public function hasViewableContent() {
 459                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 460         }
 461
 462         /**
 463          * @return int The view count for the page
 464          */
 465         public function getCount() {
 466                 if ( !$this->mDataLoaded ) {
 467                         $this->loadPageData();
 468                 }
 469
 470                 return $this->mCounter;
 471         }
 472
 473         /**
 474          * Tests if the article content represents a redirect
 475          *
 476          * @return bool
 477          */
 478         public function isRedirect() {
 479                 $content = $this->getContent();
 480                 if ( !$content ) {
 481                         return false;
 482                 }
 483
 484                 return $content->isRedirect();
 485         }
 486
 487         /**
 488          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 489          *
 490          * Will use the revisions actual content model if the page exists,
 491          * and the page's default if the page doesn't exist yet.
 492          *
 493          * @return String
 494          *
 495          * @since 1.21
 496          */
 497         public function getContentModel() {
 498                 if ( $this->exists() ) {
 499                         // look at the revision's actual content model
 500                         $rev = $this->getRevision();
 501
 502                         if ( $rev !== null ) {
 503                                 return $rev->getContentModel();
 504                         } else {
 505                                 $title = $this->mTitle->getPrefixedDBkey();
 506                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 507                         }
 508                 }
 509
 510                 // use the default model for this page
 511                 return $this->mTitle->getContentModel();
 512         }
 513
 514         /**
 515          * Loads page_touched and returns a value indicating if it should be used
 516          * @return boolean true if not a redirect
 517          */
 518         public function checkTouched() {
 519                 if ( !$this->mDataLoaded ) {
 520                         $this->loadPageData();
 521                 }
 522                 return !$this->mIsRedirect;
 523         }
 524
 525         /**
 526          * Get the page_touched field
 527          * @return string containing GMT timestamp
 528          */
 529         public function getTouched() {
 530                 if ( !$this->mDataLoaded ) {
 531                         $this->loadPageData();
 532                 }
 533                 return $this->mTouched;
 534         }
 535
 536         /**
 537          * Get the page_latest field
 538          * @return integer rev_id of current revision
 539          */
 540         public function getLatest() {
 541                 if ( !$this->mDataLoaded ) {
 542                         $this->loadPageData();
 543                 }
 544                 return (int)$this->mLatest;
 545         }
 546
 547         /**
 548          * Get the Revision object of the oldest revision
 549          * @return Revision|null
 550          */
 551         public function getOldestRevision() {
 552                 wfProfileIn( __METHOD__ );
 553
 554                 // Try using the slave database first, then try the master
 555                 $continue = 2;
 556                 $db = wfGetDB( DB_SLAVE );
 557                 $revSelectFields = Revision::selectFields();
 558
 559                 $row = null;
 560                 while ( $continue ) {
 561                         $row = $db->selectRow(
 562                                 array( 'page', 'revision' ),
 563                                 $revSelectFields,
 564                                 array(
 565                                         'page_namespace' => $this->mTitle->getNamespace(),
 566                                         'page_title' => $this->mTitle->getDBkey(),
 567                                         'rev_page = page_id'
 568                                 ),
 569                                 __METHOD__,
 570                                 array(
 571                                         'ORDER BY' => 'rev_timestamp ASC'
 572                                 )
 573                         );
 574
 575                         if ( $row ) {
 576                                 $continue = 0;
 577                         } else {
 578                                 $db = wfGetDB( DB_MASTER );
 579                                 $continue--;
 580                         }
 581                 }
 582
 583                 wfProfileOut( __METHOD__ );
 584                 return $row ? Revision::newFromRow( $row ) : null;
 585         }
 586
 587         /**
 588          * Loads everything except the text
 589          * This isn't necessary for all uses, so it's only done if needed.
 590          */
 591         protected function loadLastEdit() {
 592                 if ( $this->mLastRevision !== null ) {
 593                         return; // already loaded
 594                 }
 595
 596                 $latest = $this->getLatest();
 597                 if ( !$latest ) {
 598                         return; // page doesn't exist or is missing page_latest info
 599                 }
 600
 601                 // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always includes the
 602                 // latest changes committed. This is true even within REPEATABLE-READ transactions, where
 603                 // S1 normally only sees changes committed before the first S1 SELECT. Thus we need S1 to
 604                 // also gets the revision row FOR UPDATE; otherwise, it may not find it since a page row
 605                 // UPDATE and revision row INSERT by S2 may have happened after the first S1 SELECT.
 606                 // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 607                 $flags = ( $this->mDataLoadedFrom == self::READ_LOCKING ) ? Revision::READ_LOCKING : 0;
 608                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 609                 if ( $revision ) { // sanity
 610                         $this->setLastEdit( $revision );
 611                 }
 612         }
 613
 614         /**
 615          * Set the latest revision
 616          */
 617         protected function setLastEdit( Revision $revision ) {
 618                 $this->mLastRevision = $revision;
 619                 $this->mTimestamp = $revision->getTimestamp();
 620         }
 621
 622         /**
 623          * Get the latest revision
 624          * @return Revision|null
 625          */
 626         public function getRevision() {
 627                 $this->loadLastEdit();
 628                 if ( $this->mLastRevision ) {
 629                         return $this->mLastRevision;
 630                 }
 631                 return null;
 632         }
 633
 634         /**
 635          * Get the content of the current revision. No side-effects...
 636          *
 637          * @param $audience Integer: one of:
 638          *      Revision::FOR_PUBLIC       to be displayed to all users
 639          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 640          *      Revision::RAW              get the text regardless of permissions
 641          * @param $user User object to check for, only if FOR_THIS_USER is passed
 642          *              to the $audience parameter
 643          * @return Content|null The content of the current revision
 644          *
 645          * @since 1.21
 646          */
 647         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 648                 $this->loadLastEdit();
 649                 if ( $this->mLastRevision ) {
 650                         return $this->mLastRevision->getContent( $audience, $user );
 651                 }
 652                 return null;
 653         }
 654
 655         /**
 656          * Get the text of the current revision. No side-effects...
 657          *
 658          * @param $audience Integer: one of:
 659          *      Revision::FOR_PUBLIC       to be displayed to all users
 660          *      Revision::FOR_THIS_USER    to be displayed to the given user
 661          *      Revision::RAW              get the text regardless of permissions
 662          * @param $user User object to check for, only if FOR_THIS_USER is passed
 663          *              to the $audience parameter
 664          * @return String|false The text of the current revision
 665          * @deprecated as of 1.21, getContent() should be used instead.
 666          */
 667         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) { // @todo deprecated, replace usage!
 668                 ContentHandler::deprecated( __METHOD__, '1.21' );
 669
 670                 $this->loadLastEdit();
 671                 if ( $this->mLastRevision ) {
 672                         return $this->mLastRevision->getText( $audience, $user );
 673                 }
 674                 return false;
 675         }
 676
 677         /**
 678          * Get the text of the current revision. No side-effects...
 679          *
 680          * @return String|bool The text of the current revision. False on failure
 681          * @deprecated as of 1.21, getContent() should be used instead.
 682          */
 683         public function getRawText() {
 684                 ContentHandler::deprecated( __METHOD__, '1.21' );
 685
 686                 return $this->getText( Revision::RAW );
 687         }
 688
 689         /**
 690          * @return string MW timestamp of last article revision
 691          */
 692         public function getTimestamp() {
 693                 // Check if the field has been filled by WikiPage::setTimestamp()
 694                 if ( !$this->mTimestamp ) {
 695                         $this->loadLastEdit();
 696                 }
 697
 698                 return wfTimestamp( TS_MW, $this->mTimestamp );
 699         }
 700
 701         /**
 702          * Set the page timestamp (use only to avoid DB queries)
 703          * @param string $ts MW timestamp of last article revision
 704          * @return void
 705          */
 706         public function setTimestamp( $ts ) {
 707                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 708         }
 709
 710         /**
 711          * @param $audience Integer: one of:
 712          *      Revision::FOR_PUBLIC       to be displayed to all users
 713          *      Revision::FOR_THIS_USER    to be displayed to the given user
 714          *      Revision::RAW              get the text regardless of permissions
 715          * @param $user User object to check for, only if FOR_THIS_USER is passed
 716          *              to the $audience parameter
 717          * @return int user ID for the user that made the last article revision
 718          */
 719         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 720                 $this->loadLastEdit();
 721                 if ( $this->mLastRevision ) {
 722                         return $this->mLastRevision->getUser( $audience, $user );
 723                 } else {
 724                         return -1;
 725                 }
 726         }
 727
 728         /**
 729          * Get the User object of the user who created the page
 730          * @param $audience Integer: one of:
 731          *      Revision::FOR_PUBLIC       to be displayed to all users
 732          *      Revision::FOR_THIS_USER    to be displayed to the given user
 733          *      Revision::RAW              get the text regardless of permissions
 734          * @param $user User object to check for, only if FOR_THIS_USER is passed
 735          *              to the $audience parameter
 736          * @return User|null
 737          */
 738         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 739                 $revision = $this->getOldestRevision();
 740                 if ( $revision ) {
 741                         $userName = $revision->getUserText( $audience, $user );
 742                         return User::newFromName( $userName, false );
 743                 } else {
 744                         return null;
 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 username of the user that made the last article revision
 756          */
 757         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 758                 $this->loadLastEdit();
 759                 if ( $this->mLastRevision ) {
 760                         return $this->mLastRevision->getUserText( $audience, $user );
 761                 } else {
 762                         return '';
 763                 }
 764         }
 765
 766         /**
 767          * @param $audience Integer: one of:
 768          *      Revision::FOR_PUBLIC       to be displayed to all users
 769          *      Revision::FOR_THIS_USER    to be displayed to the given user
 770          *      Revision::RAW              get the text regardless of permissions
 771          * @param $user User object to check for, only if FOR_THIS_USER is passed
 772          *              to the $audience parameter
 773          * @return string Comment stored for the last article revision
 774          */
 775         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 776                 $this->loadLastEdit();
 777                 if ( $this->mLastRevision ) {
 778                         return $this->mLastRevision->getComment( $audience, $user );
 779                 } else {
 780                         return '';
 781                 }
 782         }
 783
 784         /**
 785          * Returns true if last revision was marked as "minor edit"
 786          *
 787          * @return boolean Minor edit indicator for the last article revision.
 788          */
 789         public function getMinorEdit() {
 790                 $this->loadLastEdit();
 791                 if ( $this->mLastRevision ) {
 792                         return $this->mLastRevision->isMinor();
 793                 } else {
 794                         return false;
 795                 }
 796         }
 797
 798         /**
 799          * Get the cached timestamp for the last time the page changed.
 800          * This is only used to help handle slave lag by comparing to page_touched.
 801          * @return string MW timestamp
 802          */
 803         protected function getCachedLastEditTime() {
 804                 global $wgMemc;
 805                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 806                 return $wgMemc->get( $key );
 807         }
 808
 809         /**
 810          * Set the cached timestamp for the last time the page changed.
 811          * This is only used to help handle slave lag by comparing to page_touched.
 812          * @param $timestamp string
 813          * @return void
 814          */
 815         public function setCachedLastEditTime( $timestamp ) {
 816                 global $wgMemc;
 817                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 818                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60 * 15 );
 819         }
 820
 821         /**
 822          * Determine whether a page would be suitable for being counted as an
 823          * article in the site_stats table based on the title & its content
 824          *
 825          * @param $editInfo Object|bool (false): object returned by prepareTextForEdit(),
 826          *        if false, the current database state will be used
 827          * @return Boolean
 828          */
 829         public function isCountable( $editInfo = false ) {
 830                 global $wgArticleCountMethod;
 831
 832                 if ( !$this->mTitle->isContentPage() ) {
 833                         return false;
 834                 }
 835
 836                 if ( $editInfo ) {
 837                         $content = $editInfo->pstContent;
 838                 } else {
 839                         $content = $this->getContent();
 840                 }
 841
 842                 if ( !$content || $content->isRedirect() ) {
 843                         return false;
 844                 }
 845
 846                 $hasLinks = null;
 847
 848                 if ( $wgArticleCountMethod === 'link' ) {
 849                         // nasty special case to avoid re-parsing to detect links
 850
 851                         if ( $editInfo ) {
 852                                 // ParserOutput::getLinks() is a 2D array of page links, so
 853                                 // to be really correct we would need to recurse in the array
 854                                 // but the main array should only have items in it if there are
 855                                 // links.
 856                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 857                         } else {
 858                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 859                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 860                         }
 861                 }
 862
 863                 return $content->isCountable( $hasLinks );
 864         }
 865
 866         /**
 867          * If this page is a redirect, get its target
 868          *
 869          * The target will be fetched from the redirect table if possible.
 870          * If this page doesn't have an entry there, call insertRedirect()
 871          * @return Title|mixed object, or null if this page is not a redirect
 872          */
 873         public function getRedirectTarget() {
 874                 if ( !$this->mTitle->isRedirect() ) {
 875                         return null;
 876                 }
 877
 878                 if ( $this->mRedirectTarget !== null ) {
 879                         return $this->mRedirectTarget;
 880                 }
 881
 882                 // Query the redirect table
 883                 $dbr = wfGetDB( DB_SLAVE );
 884                 $row = $dbr->selectRow( 'redirect',
 885                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 886                         array( 'rd_from' => $this->getId() ),
 887                         __METHOD__
 888                 );
 889
 890                 // rd_fragment and rd_interwiki were added later, populate them if empty
 891                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 892                         return $this->mRedirectTarget = Title::makeTitle(
 893                                 $row->rd_namespace, $row->rd_title,
 894                                 $row->rd_fragment, $row->rd_interwiki );
 895                 }
 896
 897                 // This page doesn't have an entry in the redirect table
 898                 return $this->mRedirectTarget = $this->insertRedirect();
 899         }
 900
 901         /**
 902          * Insert an entry for this page into the redirect table.
 903          *
 904          * Don't call this function directly unless you know what you're doing.
 905          * @return Title object or null if not a redirect
 906          */
 907         public function insertRedirect() {
 908                 // recurse through to only get the final target
 909                 $content = $this->getContent();
 910                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 911                 if ( !$retval ) {
 912                         return null;
 913                 }
 914                 $this->insertRedirectEntry( $retval );
 915                 return $retval;
 916         }
 917
 918         /**
 919          * Insert or update the redirect table entry for this page to indicate
 920          * it redirects to $rt .
 921          * @param $rt Title redirect target
 922          */
 923         public function insertRedirectEntry( $rt ) {
 924                 $dbw = wfGetDB( DB_MASTER );
 925                 $dbw->replace( 'redirect', array( 'rd_from' ),
 926                         array(
 927                                 'rd_from' => $this->getId(),
 928                                 'rd_namespace' => $rt->getNamespace(),
 929                                 'rd_title' => $rt->getDBkey(),
 930                                 'rd_fragment' => $rt->getFragment(),
 931                                 'rd_interwiki' => $rt->getInterwiki(),
 932                         ),
 933                         __METHOD__
 934                 );
 935         }
 936
 937         /**
 938          * Get the Title object or URL this page redirects to
 939          *
 940          * @return mixed false, Title of in-wiki target, or string with URL
 941          */
 942         public function followRedirect() {
 943                 return $this->getRedirectURL( $this->getRedirectTarget() );
 944         }
 945
 946         /**
 947          * Get the Title object or URL to use for a redirect. We use Title
 948          * objects for same-wiki, non-special redirects and URLs for everything
 949          * else.
 950          * @param $rt Title Redirect target
 951          * @return mixed false, Title object of local target, or string with URL
 952          */
 953         public function getRedirectURL( $rt ) {
 954                 if ( !$rt ) {
 955                         return false;
 956                 }
 957
 958                 if ( $rt->isExternal() ) {
 959                         if ( $rt->isLocal() ) {
 960                                 // Offsite wikis need an HTTP redirect.
 961                                 //
 962                                 // This can be hard to reverse and may produce loops,
 963                                 // so they may be disabled in the site configuration.
 964                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 965                                 return $rt->getFullURL( array( 'rdfrom' => $source ) );
 966                         } else {
 967                                 // External pages pages without "local" bit set are not valid
 968                                 // redirect targets
 969                                 return false;
 970                         }
 971                 }
 972
 973                 if ( $rt->isSpecialPage() ) {
 974                         // Gotta handle redirects to special pages differently:
 975                         // Fill the HTTP response "Location" header and ignore
 976                         // the rest of the page we're on.
 977                         //
 978                         // Some pages are not valid targets
 979                         if ( $rt->isValidRedirectTarget() ) {
 980                                 return $rt->getFullURL();
 981                         } else {
 982                                 return false;
 983                         }
 984                 }
 985
 986                 return $rt;
 987         }
 988
 989         /**
 990          * Get a list of users who have edited this article, not including the user who made
 991          * the most recent revision, which you can get from $article->getUser() if you want it
 992          * @return UserArrayFromResult
 993          */
 994         public function getContributors() {
 995                 // @todo FIXME: This is expensive; cache this info somewhere.
 996
 997                 $dbr = wfGetDB( DB_SLAVE );
 998
 999                 if ( $dbr->implicitGroupby() ) {
1000                         $realNameField = 'user_real_name';
1001                 } else {
1002                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1003                 }
1004
1005                 $tables = array( 'revision', 'user' );
1006
1007                 $fields = array(
1008                         'user_id' => 'rev_user',
1009                         'user_name' => 'rev_user_text',
1010                         $realNameField,
1011                         'timestamp' => 'MAX(rev_timestamp)',
1012                 );
1013
1014                 $conds = array( 'rev_page' => $this->getId() );
1015
1016                 // The user who made the top revision gets credited as "this page was last edited by
1017                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1018                 $user = $this->getUser();
1019                 if ( $user ) {
1020                         $conds[] = "rev_user != $user";
1021                 } else {
1022                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1023                 }
1024
1025                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
1026
1027                 $jconds = array(
1028                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
1029                 );
1030
1031                 $options = array(
1032                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
1033                         'ORDER BY' => 'timestamp DESC',
1034                 );
1035
1036                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1037                 return new UserArrayFromResult( $res );
1038         }
1039
1040         /**
1041          * Get the last N authors
1042          * @param int $num Number of revisions to get
1043          * @param int|string $revLatest the latest rev_id, selected from the master (optional)
1044          * @return array Array of authors, duplicates not removed
1045          */
1046         public function getLastNAuthors( $num, $revLatest = 0 ) {
1047                 wfProfileIn( __METHOD__ );
1048                 // First try the slave
1049                 // If that doesn't have the latest revision, try the master
1050                 $continue = 2;
1051                 $db = wfGetDB( DB_SLAVE );
1052
1053                 do {
1054                         $res = $db->select( array( 'page', 'revision' ),
1055                                 array( 'rev_id', 'rev_user_text' ),
1056                                 array(
1057                                         'page_namespace' => $this->mTitle->getNamespace(),
1058                                         'page_title' => $this->mTitle->getDBkey(),
1059                                         'rev_page = page_id'
1060                                 ), __METHOD__,
1061                                 array(
1062                                         'ORDER BY' => 'rev_timestamp DESC',
1063                                         'LIMIT' => $num
1064                                 )
1065                         );
1066
1067                         if ( !$res ) {
1068                                 wfProfileOut( __METHOD__ );
1069                                 return array();
1070                         }
1071
1072                         $row = $db->fetchObject( $res );
1073
1074                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1075                                 $db = wfGetDB( DB_MASTER );
1076                                 $continue--;
1077                         } else {
1078                                 $continue = 0;
1079                         }
1080                 } while ( $continue );
1081
1082                 $authors = array( $row->rev_user_text );
1083
1084                 foreach ( $res as $row ) {
1085                         $authors[] = $row->rev_user_text;
1086                 }
1087
1088                 wfProfileOut( __METHOD__ );
1089                 return $authors;
1090         }
1091
1092         /**
1093          * Should the parser cache be used?
1094          *
1095          * @param $parserOptions ParserOptions to check
1096          * @param $oldid int
1097          * @return boolean
1098          */
1099         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1100                 global $wgEnableParserCache;
1101
1102                 return $wgEnableParserCache
1103                         && $parserOptions->getStubThreshold() == 0
1104                         && $this->exists()
1105                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1106                         && $this->getContentHandler()->isParserCacheSupported();
1107         }
1108
1109         /**
1110          * Get a ParserOutput for the given ParserOptions and revision ID.
1111          * The parser cache will be used if possible.
1112          *
1113          * @since 1.19
1114          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1115          * @param null|int $oldid Revision ID to get the text from, passing null or 0 will
1116          *               get the current revision (default value)
1117          *
1118          * @return ParserOutput or false if the revision was not found
1119          */
1120         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1121                 wfProfileIn( __METHOD__ );
1122
1123                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1124                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1125                 if ( $parserOptions->getStubThreshold() ) {
1126                         wfIncrStats( 'pcache_miss_stub' );
1127                 }
1128
1129                 if ( $useParserCache ) {
1130                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1131                         if ( $parserOutput !== false ) {
1132                                 wfProfileOut( __METHOD__ );
1133                                 return $parserOutput;
1134                         }
1135                 }
1136
1137                 if ( $oldid === null || $oldid === 0 ) {
1138                         $oldid = $this->getLatest();
1139                 }
1140
1141                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1142                 $pool->execute();
1143
1144                 wfProfileOut( __METHOD__ );
1145
1146                 return $pool->getParserOutput();
1147         }
1148
1149         /**
1150          * Do standard deferred updates after page view
1151          * @param User $user The relevant user
1152          * @param int $oldid The revision id being viewed. If not given or 0, latest revision is assumed.
1153          */
1154         public function doViewUpdates( User $user, $oldid = 0 ) {
1155                 global $wgDisableCounters;
1156                 if ( wfReadOnly() ) {
1157                         return;
1158                 }
1159
1160                 // Don't update page view counters on views from bot users (bug 14044)
1161                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->exists() ) {
1162                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1163                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1164                 }
1165
1166                 // Update newtalk / watchlist notification status
1167                 $user->clearNotification( $this->mTitle, $oldid );
1168         }
1169
1170         /**
1171          * Perform the actions of a page purging
1172          * @return bool
1173          */
1174         public function doPurge() {
1175                 global $wgUseSquid;
1176
1177                 if ( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1178                         return false;
1179                 }
1180
1181                 // Invalidate the cache
1182                 $this->mTitle->invalidateCache();
1183
1184                 if ( $wgUseSquid ) {
1185                         // Commit the transaction before the purge is sent
1186                         $dbw = wfGetDB( DB_MASTER );
1187                         $dbw->commit( __METHOD__ );
1188
1189                         // Send purge
1190                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1191                         $update->doUpdate();
1192                 }
1193
1194                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1195                         // @todo move this logic to MessageCache
1196
1197                         if ( $this->exists() ) {
1198                                 // NOTE: use transclusion text for messages.
1199                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1200
1201                                 $content = $this->getContent();
1202                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1203
1204                                 if ( $text === null ) {
1205                                         $text = false;
1206                                 }
1207                         } else {
1208                                 $text = false;
1209                         }
1210
1211                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1212                 }
1213                 return true;
1214         }
1215
1216         /**
1217          * Insert a new empty page record for this article.
1218          * This *must* be followed up by creating a revision
1219          * and running $this->updateRevisionOn( ... );
1220          * or else the record will be left in a funky state.
1221          * Best if all done inside a transaction.
1222          *
1223          * @param $dbw DatabaseBase
1224          * @return int The newly created page_id key, or false if the title already existed
1225          */
1226         public function insertOn( $dbw ) {
1227                 wfProfileIn( __METHOD__ );
1228
1229                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1230                 $dbw->insert( 'page', array(
1231                         'page_id'           => $page_id,
1232                         'page_namespace'    => $this->mTitle->getNamespace(),
1233                         'page_title'        => $this->mTitle->getDBkey(),
1234                         'page_counter'      => 0,
1235                         'page_restrictions' => '',
1236                         'page_is_redirect'  => 0, // Will set this shortly...
1237                         'page_is_new'       => 1,
1238                         'page_random'       => wfRandom(),
1239                         'page_touched'      => $dbw->timestamp(),
1240                         'page_latest'       => 0, // Fill this in shortly...
1241                         'page_len'          => 0, // Fill this in shortly...
1242                 ), __METHOD__, 'IGNORE' );
1243
1244                 $affected = $dbw->affectedRows();
1245
1246                 if ( $affected ) {
1247                         $newid = $dbw->insertId();
1248                         $this->mId = $newid;
1249                         $this->mTitle->resetArticleID( $newid );
1250                 }
1251                 wfProfileOut( __METHOD__ );
1252
1253                 return $affected ? $newid : false;
1254         }
1255
1256         /**
1257          * Update the page record to point to a newly saved revision.
1258          *
1259          * @param $dbw DatabaseBase: object
1260          * @param $revision Revision: For ID number, and text used to set
1261          *                  length and redirect status fields
1262          * @param $lastRevision Integer: if given, will not overwrite the page field
1263          *                      when different from the currently set value.
1264          *                      Giving 0 indicates the new page flag should be set
1265          *                      on.
1266          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1267          *                           removing rows in redirect table.
1268          * @return bool true on success, false on failure
1269          * @private
1270          */
1271         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1272                 global $wgContentHandlerUseDB;
1273
1274                 wfProfileIn( __METHOD__ );
1275
1276                 $content = $revision->getContent();
1277                 $len = $content ? $content->getSize() : 0;
1278                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1279
1280                 $conditions = array( 'page_id' => $this->getId() );
1281
1282                 if ( !is_null( $lastRevision ) ) {
1283                         // An extra check against threads stepping on each other
1284                         $conditions['page_latest'] = $lastRevision;
1285                 }
1286
1287                 $now = wfTimestampNow();
1288                 $row = array( /* SET */
1289                         'page_latest'      => $revision->getId(),
1290                         'page_touched'     => $dbw->timestamp( $now ),
1291                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1292                         'page_is_redirect' => $rt !== null ? 1 : 0,
1293                         'page_len'         => $len,
1294                 );
1295
1296                 if ( $wgContentHandlerUseDB ) {
1297                         $row['page_content_model'] = $revision->getContentModel();
1298                 }
1299
1300                 $dbw->update( 'page',
1301                         $row,
1302                         $conditions,
1303                         __METHOD__ );
1304
1305                 $result = $dbw->affectedRows() > 0;
1306                 if ( $result ) {
1307                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1308                         $this->setLastEdit( $revision );
1309                         $this->setCachedLastEditTime( $now );
1310                         $this->mLatest = $revision->getId();
1311                         $this->mIsRedirect = (bool)$rt;
1312                         // Update the LinkCache.
1313                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect,
1314                                                                                                         $this->mLatest, $revision->getContentModel() );
1315                 }
1316
1317                 wfProfileOut( __METHOD__ );
1318                 return $result;
1319         }
1320
1321         /**
1322          * Add row to the redirect table if this is a redirect, remove otherwise.
1323          *
1324          * @param $dbw DatabaseBase
1325          * @param $redirectTitle Title object pointing to the redirect target,
1326          *                       or NULL if this is not a redirect
1327          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1328          *                           removing rows in redirect table.
1329          * @return bool true on success, false on failure
1330          * @private
1331          */
1332         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1333                 // Always update redirects (target link might have changed)
1334                 // Update/Insert if we don't know if the last revision was a redirect or not
1335                 // Delete if changing from redirect to non-redirect
1336                 $isRedirect = !is_null( $redirectTitle );
1337
1338                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1339                         return true;
1340                 }
1341
1342                 wfProfileIn( __METHOD__ );
1343                 if ( $isRedirect ) {
1344                         $this->insertRedirectEntry( $redirectTitle );
1345                 } else {
1346                         // This is not a redirect, remove row from redirect table
1347                         $where = array( 'rd_from' => $this->getId() );
1348                         $dbw->delete( 'redirect', $where, __METHOD__ );
1349                 }
1350
1351                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1352                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1353                 }
1354                 wfProfileOut( __METHOD__ );
1355
1356                 return ( $dbw->affectedRows() != 0 );
1357         }
1358
1359         /**
1360          * If the given revision is newer than the currently set page_latest,
1361          * update the page record. Otherwise, do nothing.
1362          *
1363          * @param $dbw DatabaseBase object
1364          * @param $revision Revision object
1365          * @return mixed
1366          */
1367         public function updateIfNewerOn( $dbw, $revision ) {
1368                 wfProfileIn( __METHOD__ );
1369
1370                 $row = $dbw->selectRow(
1371                         array( 'revision', 'page' ),
1372                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1373                         array(
1374                                 'page_id' => $this->getId(),
1375                                 'page_latest=rev_id' ),
1376                         __METHOD__ );
1377
1378                 if ( $row ) {
1379                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1380                                 wfProfileOut( __METHOD__ );
1381                                 return false;
1382                         }
1383                         $prev = $row->rev_id;
1384                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1385                 } else {
1386                         // No or missing previous revision; mark the page as new
1387                         $prev = 0;
1388                         $lastRevIsRedirect = null;
1389                 }
1390
1391                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1392
1393                 wfProfileOut( __METHOD__ );
1394                 return $ret;
1395         }
1396
1397         /**
1398          * Get the content that needs to be saved in order to undo all revisions
1399          * between $undo and $undoafter. Revisions must belong to the same page,
1400          * must exist and must not be deleted
1401          * @param $undo Revision
1402          * @param $undoafter Revision Must be an earlier revision than $undo
1403          * @return mixed string on success, false on failure
1404          * @since 1.21
1405          * Before we had the Content object, this was done in getUndoText
1406          */
1407         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1408                 $handler = $undo->getContentHandler();
1409                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1410         }
1411
1412         /**
1413          * Get the text that needs to be saved in order to undo all revisions
1414          * between $undo and $undoafter. Revisions must belong to the same page,
1415          * must exist and must not be deleted
1416          * @param $undo Revision
1417          * @param $undoafter Revision Must be an earlier revision than $undo
1418          * @return mixed string on success, false on failure
1419          * @deprecated since 1.21: use ContentHandler::getUndoContent() instead.
1420          */
1421         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1422                 ContentHandler::deprecated( __METHOD__, '1.21' );
1423
1424                 $this->loadLastEdit();
1425
1426                 if ( $this->mLastRevision ) {
1427                         if ( is_null( $undoafter ) ) {
1428                                 $undoafter = $undo->getPrevious();
1429                         }
1430
1431                         $handler = $this->getContentHandler();
1432                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1433
1434                         if ( !$undone ) {
1435                                 return false;
1436                         } else {
1437                                 return ContentHandler::getContentText( $undone );
1438                         }
1439                 }
1440
1441                 return false;
1442         }
1443
1444         /**
1445          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1446          * @param string $text new text of the section
1447          * @param string $sectionTitle new section's subject, only if $section is 'new'
1448          * @param string $edittime revision timestamp or null to use the current revision
1449          * @throws MWException
1450          * @return String new complete article text, or null if error
1451          *
1452          * @deprecated since 1.21, use replaceSectionContent() instead
1453          */
1454         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1455                 ContentHandler::deprecated( __METHOD__, '1.21' );
1456
1457                 if ( strval( $section ) == '' ) { //NOTE: keep condition in sync with condition in replaceSectionContent!
1458                         // Whole-page edit; let the whole text through
1459                         return $text;
1460                 }
1461
1462                 if ( !$this->supportsSections() ) {
1463                         throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1464                 }
1465
1466                 // could even make section title, but that's not required.
1467                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() );
1468
1469                 $newContent = $this->replaceSectionContent( $section, $sectionContent, $sectionTitle, $edittime );
1470
1471                 return ContentHandler::getContentText( $newContent );
1472         }
1473
1474         /**
1475          * Returns true if this page's content model supports sections.
1476          *
1477          * @return boolean whether sections are supported.
1478          *
1479          * @todo The skin should check this and not offer section functionality if sections are not supported.
1480          * @todo The EditPage should check this and not offer section functionality if sections are not supported.
1481          */
1482         public function supportsSections() {
1483                 return $this->getContentHandler()->supportsSections();
1484         }
1485
1486         /**
1487          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1488          * @param $sectionContent Content: new content of the section
1489          * @param string $sectionTitle new section's subject, only if $section is 'new'
1490          * @param string $edittime revision timestamp or null to use the current revision
1491          *
1492          * @throws MWException
1493          * @return Content new complete article content, or null if error
1494          *
1495          * @since 1.21
1496          */
1497         public function replaceSectionContent( $section, Content $sectionContent, $sectionTitle = '', $edittime = null ) {
1498                 wfProfileIn( __METHOD__ );
1499
1500                 if ( strval( $section ) == '' ) {
1501                         // Whole-page edit; let the whole text through
1502                         $newContent = $sectionContent;
1503                 } else {
1504                         if ( !$this->supportsSections() ) {
1505                                 wfProfileOut( __METHOD__ );
1506                                 throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1507                         }
1508
1509                         // Bug 30711: always use current version when adding a new section
1510                         if ( is_null( $edittime ) || $section == 'new' ) {
1511                                 $oldContent = $this->getContent();
1512                         } else {
1513                                 $dbw = wfGetDB( DB_MASTER );
1514                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1515
1516                                 if ( !$rev ) {
1517                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1518                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1519                                         wfProfileOut( __METHOD__ );
1520                                         return null;
1521                                 }
1522
1523                                 $oldContent = $rev->getContent();
1524                         }
1525
1526                         if ( ! $oldContent ) {
1527                                 wfDebug( __METHOD__ . ": no page text\n" );
1528                                 wfProfileOut( __METHOD__ );
1529                                 return null;
1530                         }
1531
1532                         // FIXME: $oldContent might be null?
1533                         $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1534                 }
1535
1536                 wfProfileOut( __METHOD__ );
1537                 return $newContent;
1538         }
1539
1540         /**
1541          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1542          * @param $flags Int
1543          * @return Int updated $flags
1544          */
1545         function checkFlags( $flags ) {
1546                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1547                         if ( $this->exists() ) {
1548                                 $flags |= EDIT_UPDATE;
1549                         } else {
1550                                 $flags |= EDIT_NEW;
1551                         }
1552                 }
1553
1554                 return $flags;
1555         }
1556
1557         /**
1558          * Change an existing article or create a new article. Updates RC and all necessary caches,
1559          * optionally via the deferred update array.
1560          *
1561          * @param string $text new text
1562          * @param string $summary edit summary
1563          * @param $flags Integer bitfield:
1564          *      EDIT_NEW
1565          *          Article is known or assumed to be non-existent, create a new one
1566          *      EDIT_UPDATE
1567          *          Article is known or assumed to be pre-existing, update it
1568          *      EDIT_MINOR
1569          *          Mark this edit minor, if the user is allowed to do so
1570          *      EDIT_SUPPRESS_RC
1571          *          Do not log the change in recentchanges
1572          *      EDIT_FORCE_BOT
1573          *          Mark the edit a "bot" edit regardless of user rights
1574          *      EDIT_DEFER_UPDATES
1575          *          Defer some of the updates until the end of index.php
1576          *      EDIT_AUTOSUMMARY
1577          *          Fill in blank summaries with generated text where possible
1578          *
1579          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1580          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1581          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1582          * edit-already-exists error will be returned. These two conditions are also possible with
1583          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1584          *
1585          * @param bool|int $baseRevId int the revision ID this edit was based off, if any
1586          * @param $user User the user doing the edit
1587          *
1588          * @throws MWException
1589          * @return Status object. Possible errors:
1590          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1591          *     edit-gone-missing:       In update mode, but the article didn't exist
1592          *     edit-conflict:           In update mode, the article changed unexpectedly
1593          *     edit-no-change:          Warning that the text was the same as before
1594          *     edit-already-exists:     In creation mode, but the article already exists
1595          *
1596          *  Extensions may define additional errors.
1597          *
1598          *  $return->value will contain an associative array with members as follows:
1599          *     new:                     Boolean indicating if the function attempted to create a new article
1600          *     revision:                The revision object for the inserted revision, or null
1601          *
1602          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1603          *
1604          * @deprecated since 1.21: use doEditContent() instead.
1605          */
1606         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1607                 ContentHandler::deprecated( __METHOD__, '1.21' );
1608
1609                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1610
1611                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1612         }
1613
1614         /**
1615          * Change an existing article or create a new article. Updates RC and all necessary caches,
1616          * optionally via the deferred update array.
1617          *
1618          * @param $content Content: new content
1619          * @param string $summary edit summary
1620          * @param $flags Integer bitfield:
1621          *      EDIT_NEW
1622          *          Article is known or assumed to be non-existent, create a new one
1623          *      EDIT_UPDATE
1624          *          Article is known or assumed to be pre-existing, update it
1625          *      EDIT_MINOR
1626          *          Mark this edit minor, if the user is allowed to do so
1627          *      EDIT_SUPPRESS_RC
1628          *          Do not log the change in recentchanges
1629          *      EDIT_FORCE_BOT
1630          *          Mark the edit a "bot" edit regardless of user rights
1631          *      EDIT_DEFER_UPDATES
1632          *          Defer some of the updates until the end of index.php
1633          *      EDIT_AUTOSUMMARY
1634          *          Fill in blank summaries with generated text where possible
1635          *
1636          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1637          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1638          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1639          * edit-already-exists error will be returned. These two conditions are also possible with
1640          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1641          *
1642          * @param bool|int $baseRevId the revision ID this edit was based off, if any
1643          * @param $user User the user doing the edit
1644          * @param $serialisation_format String: format for storing the content in the database
1645          *
1646          * @throws MWException
1647          * @return Status object. Possible errors:
1648          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1649          *     edit-gone-missing:       In update mode, but the article didn't exist
1650          *     edit-conflict:           In update mode, the article changed unexpectedly
1651          *     edit-no-change:          Warning that the text was the same as before
1652          *     edit-already-exists:     In creation mode, but the article already exists
1653          *
1654          *  Extensions may define additional errors.
1655          *
1656          *  $return->value will contain an associative array with members as follows:
1657          *     new:                     Boolean indicating if the function attempted to create a new article
1658          *     revision:                The revision object for the inserted revision, or null
1659          *
1660          * @since 1.21
1661          */
1662         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1663                                                                    User $user = null, $serialisation_format = null ) {
1664                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1665
1666                 // Low-level sanity check
1667                 if ( $this->mTitle->getText() === '' ) {
1668                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1669                 }
1670
1671                 wfProfileIn( __METHOD__ );
1672
1673                 if ( !$content->getContentHandler()->canBeUsedOn( $this->getTitle() ) ) {
1674                         wfProfileOut( __METHOD__ );
1675                         return Status::newFatal( 'content-not-allowed-here',
1676                                 ContentHandler::getLocalizedName( $content->getModel() ),
1677                                 $this->getTitle()->getPrefixedText() );
1678                 }
1679
1680                 $user = is_null( $user ) ? $wgUser : $user;
1681                 $status = Status::newGood( array() );
1682
1683                 // Load the data from the master database if needed.
1684                 // The caller may already loaded it from the master or even loaded it using
1685                 // SELECT FOR UPDATE, so do not override that using clear().
1686                 $this->loadPageData( 'fromdbmaster' );
1687
1688                 $flags = $this->checkFlags( $flags );
1689
1690                 // handle hook
1691                 $hook_args = array( &$this, &$user, &$content, &$summary,
1692                                                         $flags & EDIT_MINOR, null, null, &$flags, &$status );
1693
1694                 if ( !wfRunHooks( 'PageContentSave', $hook_args )
1695                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args ) ) {
1696
1697                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1698
1699                         if ( $status->isOK() ) {
1700                                 $status->fatal( 'edit-hook-aborted' );
1701                         }
1702
1703                         wfProfileOut( __METHOD__ );
1704                         return $status;
1705                 }
1706
1707                 // Silently ignore EDIT_MINOR if not allowed
1708                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1709                 $bot = $flags & EDIT_FORCE_BOT;
1710
1711                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1712
1713                 $oldsize = $old_content ? $old_content->getSize() : 0;
1714                 $oldid = $this->getLatest();
1715                 $oldIsRedirect = $this->isRedirect();
1716                 $oldcountable = $this->isCountable();
1717
1718                 $handler = $content->getContentHandler();
1719
1720                 // Provide autosummaries if one is not provided and autosummaries are enabled.
1721                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1722                         if ( !$old_content ) {
1723                                 $old_content = null;
1724                         }
1725                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1726                 }
1727
1728                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1729                 $serialized = $editInfo->pst;
1730
1731                 /**
1732                  * @var Content $content
1733                  */
1734                 $content = $editInfo->pstContent;
1735                 $newsize = $content->getSize();
1736
1737                 $dbw = wfGetDB( DB_MASTER );
1738                 $now = wfTimestampNow();
1739                 $this->mTimestamp = $now;
1740
1741                 if ( $flags & EDIT_UPDATE ) {
1742                         // Update article, but only if changed.
1743                         $status->value['new'] = false;
1744
1745                         if ( !$oldid ) {
1746                                 // Article gone missing
1747                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1748                                 $status->fatal( 'edit-gone-missing' );
1749
1750                                 wfProfileOut( __METHOD__ );
1751                                 return $status;
1752                         } elseif ( !$old_content ) {
1753                                 // Sanity check for bug 37225
1754                                 wfProfileOut( __METHOD__ );
1755                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1756                         }
1757
1758                         $revision = new Revision( array(
1759                                 'page'       => $this->getId(),
1760                                 'title'      => $this->getTitle(), // for determining the default content model
1761                                 'comment'    => $summary,
1762                                 'minor_edit' => $isminor,
1763                                 'text'       => $serialized,
1764                                 'len'        => $newsize,
1765                                 'parent_id'  => $oldid,
1766                                 'user'       => $user->getId(),
1767                                 'user_text'  => $user->getName(),
1768                                 'timestamp'  => $now,
1769                                 'content_model' => $content->getModel(),
1770                                 'content_format' => $serialisation_format,
1771                         ) ); // XXX: pass content object?!
1772
1773                         $changed = !$content->equals( $old_content );
1774
1775                         if ( $changed ) {
1776                                 if ( !$content->isValid() ) {
1777                                         wfProfileOut( __METHOD__ );
1778                                         throw new MWException( "New content failed validity check!" );
1779                                 }
1780
1781                                 $dbw->begin( __METHOD__ );
1782
1783                                 $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1784                                 $status->merge( $prepStatus );
1785
1786                                 if ( !$status->isOK() ) {
1787                                         $dbw->rollback( __METHOD__ );
1788
1789                                         wfProfileOut( __METHOD__ );
1790                                         return $status;
1791                                 }
1792
1793                                 $revisionId = $revision->insertOn( $dbw );
1794
1795                                 // Update page
1796                                 //
1797                                 // Note that we use $this->mLatest instead of fetching a value from the master DB
1798                                 // during the course of this function. This makes sure that EditPage can detect
1799                                 // edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1800                                 // before this function is called. A previous function used a separate query, this
1801                                 // creates a window where concurrent edits can cause an ignored edit conflict.
1802                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1803
1804                                 if ( !$ok ) {
1805                                         // Belated edit conflict! Run away!!
1806                                         $status->fatal( 'edit-conflict' );
1807
1808                                         $dbw->rollback( __METHOD__ );
1809
1810                                         wfProfileOut( __METHOD__ );
1811                                         return $status;
1812                                 }
1813
1814                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1815                                 // Update recentchanges
1816                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1817                                         // Mark as patrolled if the user can do so
1818                                         $patrolled = $wgUseRCPatrol && !count(
1819                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1820                                         // Add RC row to the DB
1821                                         $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1822                                                 $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1823                                                 $revisionId, $patrolled
1824                                         );
1825
1826                                         // Log auto-patrolled edits
1827                                         if ( $patrolled ) {
1828                                                 PatrolLog::record( $rc, true, $user );
1829                                         }
1830                                 }
1831                                 $user->incEditCount();
1832                                 $dbw->commit( __METHOD__ );
1833                         } else {
1834                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1835                                 // related variables correctly
1836                                 $revision->setId( $this->getLatest() );
1837                         }
1838
1839                         // Update links tables, site stats, etc.
1840                         $this->doEditUpdates(
1841                                 $revision,
1842                                 $user,
1843                                 array(
1844                                         'changed' => $changed,
1845                                         'oldcountable' => $oldcountable
1846                                 )
1847                         );
1848
1849                         if ( !$changed ) {
1850                                 $status->warning( 'edit-no-change' );
1851                                 $revision = null;
1852                                 // Update page_touched, this is usually implicit in the page update
1853                                 // Other cache updates are done in onArticleEdit()
1854                                 $this->mTitle->invalidateCache();
1855                         }
1856                 } else {
1857                         // Create new article
1858                         $status->value['new'] = true;
1859
1860                         $dbw->begin( __METHOD__ );
1861
1862                         $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1863                         $status->merge( $prepStatus );
1864
1865                         if ( !$status->isOK() ) {
1866                                 $dbw->rollback( __METHOD__ );
1867
1868                                 wfProfileOut( __METHOD__ );
1869                                 return $status;
1870                         }
1871
1872                         $status->merge( $prepStatus );
1873
1874                         // Add the page record; stake our claim on this title!
1875                         // This will return false if the article already exists
1876                         $newid = $this->insertOn( $dbw );
1877
1878                         if ( $newid === false ) {
1879                                 $dbw->rollback( __METHOD__ );
1880                                 $status->fatal( 'edit-already-exists' );
1881
1882                                 wfProfileOut( __METHOD__ );
1883                                 return $status;
1884                         }
1885
1886                         // Save the revision text...
1887                         $revision = new Revision( array(
1888                                 'page'       => $newid,
1889                                 'title'      => $this->getTitle(), // for determining the default content model
1890                                 'comment'    => $summary,
1891                                 'minor_edit' => $isminor,
1892                                 'text'       => $serialized,
1893                                 'len'        => $newsize,
1894                                 'user'       => $user->getId(),
1895                                 'user_text'  => $user->getName(),
1896                                 'timestamp'  => $now,
1897                                 'content_model' => $content->getModel(),
1898                                 'content_format' => $serialisation_format,
1899                         ) );
1900                         $revisionId = $revision->insertOn( $dbw );
1901
1902                         // Bug 37225: use accessor to get the text as Revision may trim it
1903                         $content = $revision->getContent(); // sanity; get normalized version
1904
1905                         if ( $content ) {
1906                                 $newsize = $content->getSize();
1907                         }
1908
1909                         // Update the page record with revision data
1910                         $this->updateRevisionOn( $dbw, $revision, 0 );
1911
1912                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1913
1914                         // Update recentchanges
1915                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1916                                 // Mark as patrolled if the user can do so
1917                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1918                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1919                                 // Add RC row to the DB
1920                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1921                                         '', $newsize, $revisionId, $patrolled );
1922
1923                                 // Log auto-patrolled edits
1924                                 if ( $patrolled ) {
1925                                         PatrolLog::record( $rc, true, $user );
1926                                 }
1927                         }
1928                         $user->incEditCount();
1929                         $dbw->commit( __METHOD__ );
1930
1931                         // Update links, etc.
1932                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1933
1934                         $hook_args = array( &$this, &$user, $content, $summary,
1935                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision );
1936
1937                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $hook_args );
1938                         wfRunHooks( 'PageContentInsertComplete', $hook_args );
1939                 }
1940
1941                 // Do updates right now unless deferral was requested
1942                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1943                         DeferredUpdates::doUpdates();
1944                 }
1945
1946                 // Return the new revision (or null) to the caller
1947                 $status->value['revision'] = $revision;
1948
1949                 $hook_args = array( &$this, &$user, $content, $summary,
1950                                                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId );
1951
1952                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $hook_args );
1953                 wfRunHooks( 'PageContentSaveComplete', $hook_args );
1954
1955                 // Promote user to any groups they meet the criteria for
1956                 $user->addAutopromoteOnceGroups( 'onEdit' );
1957
1958                 wfProfileOut( __METHOD__ );
1959                 return $status;
1960         }
1961
1962         /**
1963          * Get parser options suitable for rendering the primary article wikitext
1964          *
1965          * @see ContentHandler::makeParserOptions
1966          *
1967          * @param IContextSource|User|string $context One of the following:
1968          *        - IContextSource: Use the User and the Language of the provided
1969          *          context
1970          *        - User: Use the provided User object and $wgLang for the language,
1971          *          so use an IContextSource object if possible.
1972          *        - 'canonical': Canonical options (anonymous user with default
1973          *          preferences and content language).
1974          * @return ParserOptions
1975          */
1976         public function makeParserOptions( $context ) {
1977                 $options = $this->getContentHandler()->makeParserOptions( $context );
1978
1979                 if ( $this->getTitle()->isConversionTable() ) {
1980                         // @todo ConversionTable should become a separate content model, so we don't need special cases like this one.
1981                         $options->disableContentConversion();
1982                 }
1983
1984                 return $options;
1985         }
1986
1987         /**
1988          * Prepare text which is about to be saved.
1989          * Returns a stdclass with source, pst and output members
1990          *
1991          * @deprecated in 1.21: use prepareContentForEdit instead.
1992          */
1993         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1994                 ContentHandler::deprecated( __METHOD__, '1.21' );
1995                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1996                 return $this->prepareContentForEdit( $content, $revid, $user );
1997         }
1998
1999         /**
2000          * Prepare content which is about to be saved.
2001          * Returns a stdclass with source, pst and output members
2002          *
2003          * @param Content $content
2004          * @param int|null $revid
2005          * @param User|null $user
2006          * @param string|null $serialization_format
2007          *
2008          * @return bool|object
2009          *
2010          * @since 1.21
2011          */
2012         public function prepareContentForEdit( Content $content, $revid = null, User $user = null,
2013                 $serialization_format = null
2014         ) {
2015                 global $wgContLang, $wgUser;
2016                 $user = is_null( $user ) ? $wgUser : $user;
2017                 //XXX: check $user->getId() here???
2018
2019                 if ( $this->mPreparedEdit
2020                         && $this->mPreparedEdit->newContent
2021                         && $this->mPreparedEdit->newContent->equals( $content )
2022                         && $this->mPreparedEdit->revid == $revid
2023                         && $this->mPreparedEdit->format == $serialization_format
2024                         // XXX: also check $user here?
2025                 ) {
2026                         // Already prepared
2027                         return $this->mPreparedEdit;
2028                 }
2029
2030                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2031                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
2032
2033                 $edit = (object)array();
2034                 $edit->revid = $revid;
2035
2036                 $edit->pstContent = $content ? $content->preSaveTransform( $this->mTitle, $user, $popts ) : null;
2037
2038                 $edit->format = $serialization_format;
2039                 $edit->popts = $this->makeParserOptions( 'canonical' );
2040                 $edit->output = $edit->pstContent ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts ) : null;
2041
2042                 $edit->newContent = $content;
2043                 $edit->oldContent = $this->getContent( Revision::RAW );
2044
2045                 // NOTE: B/C for hooks! don't use these fields!
2046                 $edit->newText = $edit->newContent ? ContentHandler::getContentText( $edit->newContent ) : '';
2047                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
2048                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialization_format ) : '';
2049
2050                 $this->mPreparedEdit = $edit;
2051                 return $edit;
2052         }
2053
2054         /**
2055          * Do standard deferred updates after page edit.
2056          * Update links tables, site stats, search index and message cache.
2057          * Purges pages that include this page if the text was changed here.
2058          * Every 100th edit, prune the recent changes table.
2059          *
2060          * @param $revision Revision object
2061          * @param $user User object that did the revision
2062          * @param array $options of options, following indexes are used:
2063          * - changed: boolean, whether the revision changed the content (default true)
2064          * - created: boolean, whether the revision created the page (default false)
2065          * - oldcountable: boolean or null (default null):
2066          *   - boolean: whether the page was counted as an article before that
2067          *     revision, only used in changed is true and created is false
2068          *   - null: don't change the article count
2069          */
2070         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2071                 global $wgEnableParserCache;
2072
2073                 wfProfileIn( __METHOD__ );
2074
2075                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2076                 $content = $revision->getContent();
2077
2078                 // Parse the text
2079                 // Be careful not to do pre-save transform twice: $text is usually
2080                 // already pre-save transformed once.
2081                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2082                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2083                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
2084                 } else {
2085                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2086                         $editInfo = $this->mPreparedEdit;
2087                 }
2088
2089                 // Save it to the parser cache
2090                 if ( $wgEnableParserCache ) {
2091                         $parserCache = ParserCache::singleton();
2092                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2093                 }
2094
2095                 // Update the links tables and other secondary data
2096                 if ( $content ) {
2097                         $recursive = $options['changed']; // bug 50785
2098                         $updates = $content->getSecondaryDataUpdates(
2099                                 $this->getTitle(), null, $recursive, $editInfo->output );
2100                         DataUpdate::runUpdates( $updates );
2101                 }
2102
2103                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2104
2105                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2106                         if ( 0 == mt_rand( 0, 99 ) ) {
2107                                 // Flush old entries from the `recentchanges` table; we do this on
2108                                 // random requests so as to avoid an increase in writes for no good reason
2109                                 RecentChange::purgeExpiredChanges();
2110                         }
2111                 }
2112
2113                 if ( !$this->exists() ) {
2114                         wfProfileOut( __METHOD__ );
2115                         return;
2116                 }
2117
2118                 $id = $this->getId();
2119                 $title = $this->mTitle->getPrefixedDBkey();
2120                 $shortTitle = $this->mTitle->getDBkey();
2121
2122                 if ( !$options['changed'] ) {
2123                         $good = 0;
2124                         $total = 0;
2125                 } elseif ( $options['created'] ) {
2126                         $good = (int)$this->isCountable( $editInfo );
2127                         $total = 1;
2128                 } elseif ( $options['oldcountable'] !== null ) {
2129                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2130                         $total = 0;
2131                 } else {
2132                         $good = 0;
2133                         $total = 0;
2134                 }
2135
2136                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2137                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2138
2139                 // If this is another user's talk page, update newtalk.
2140                 // Don't do this if $options['changed'] = false (null-edits) nor if
2141                 // it's a minor edit and the user doesn't want notifications for those.
2142                 if ( $options['changed']
2143                         && $this->mTitle->getNamespace() == NS_USER_TALK
2144                         && $shortTitle != $user->getTitleKey()
2145                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2146                 ) {
2147                         $recipient = User::newFromName( $shortTitle, false );
2148                         if ( !$recipient ) {
2149                                 wfDebug( __METHOD__ . ": invalid username\n" );
2150                         } else {
2151                                 // Allow extensions to prevent user notification when a new message is added to their talk page
2152                                 if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this, $recipient ) ) ) {
2153                                         if ( User::isIP( $shortTitle ) ) {
2154                                                 // An anonymous user
2155                                                 $recipient->setNewtalk( true, $revision );
2156                                         } elseif ( $recipient->isLoggedIn() ) {
2157                                                 $recipient->setNewtalk( true, $revision );
2158                                         } else {
2159                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2160                                         }
2161                                 }
2162                         }
2163                 }
2164
2165                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2166                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2167                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2168                         if ( $msgtext === false || $msgtext === null ) {
2169                                 $msgtext = '';
2170                         }
2171
2172                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2173                 }
2174
2175                 if ( $options['created'] ) {
2176                         self::onArticleCreate( $this->mTitle );
2177                 } else {
2178                         self::onArticleEdit( $this->mTitle );
2179                 }
2180
2181                 wfProfileOut( __METHOD__ );
2182         }
2183
2184         /**
2185          * Edit an article without doing all that other stuff
2186          * The article must already exist; link tables etc
2187          * are not updated, caches are not flushed.
2188          *
2189          * @param string $text text submitted
2190          * @param $user User The relevant user
2191          * @param string $comment comment submitted
2192          * @param $minor Boolean: whereas it's a minor modification
2193          *
2194          * @deprecated since 1.21, use doEditContent() instead.
2195          */
2196         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2197                 ContentHandler::deprecated( __METHOD__, "1.21" );
2198
2199                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2200                 $this->doQuickEditContent( $content, $user, $comment, $minor );
2201         }
2202
2203         /**
2204          * Edit an article without doing all that other stuff
2205          * The article must already exist; link tables etc
2206          * are not updated, caches are not flushed.
2207          *
2208          * @param Content $content Content submitted
2209          * @param User $user The relevant user
2210          * @param string $comment comment submitted
2211          * @param string $serialisation_format Format for storing the content in the database
2212          * @param bool $minor Whereas it's a minor modification
2213          */
2214         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = false,
2215                 $serialisation_format = null
2216         ) {
2217                 wfProfileIn( __METHOD__ );
2218
2219                 $serialized = $content->serialize( $serialisation_format );
2220
2221                 $dbw = wfGetDB( DB_MASTER );
2222                 $revision = new Revision( array(
2223                         'title'      => $this->getTitle(), // for determining the default content model
2224                         'page'       => $this->getId(),
2225                         'text'       => $serialized,
2226                         'length'     => $content->getSize(),
2227                         'comment'    => $comment,
2228                         'minor_edit' => $minor ? 1 : 0,
2229                 ) ); // XXX: set the content object?
2230                 $revision->insertOn( $dbw );
2231                 $this->updateRevisionOn( $dbw, $revision );
2232
2233                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2234
2235                 wfProfileOut( __METHOD__ );
2236         }
2237
2238         /**
2239          * Update the article's restriction field, and leave a log entry.
2240          * This works for protection both existing and non-existing pages.
2241          *
2242          * @param array $limit set of restriction keys
2243          * @param array $expiry per restriction type expiration
2244          * @param int &$cascade Set to false if cascading protection isn't allowed.
2245          * @param string $reason
2246          * @param User $user The user updating the restrictions
2247          * @return Status
2248          */
2249         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
2250                 global $wgCascadingRestrictionLevels;
2251
2252                 if ( wfReadOnly() ) {
2253                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2254                 }
2255
2256                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2257
2258                 $id = $this->getId();
2259
2260                 if ( !$cascade ) {
2261                         $cascade = false;
2262                 }
2263
2264                 // Take this opportunity to purge out expired restrictions
2265                 Title::purgeExpiredRestrictions();
2266
2267                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2268                 // we expect a single selection, but the schema allows otherwise.
2269                 $isProtected = false;
2270                 $protect = false;
2271                 $changed = false;
2272
2273                 $dbw = wfGetDB( DB_MASTER );
2274
2275                 foreach ( $restrictionTypes as $action ) {
2276                         if ( !isset( $expiry[$action] ) ) {
2277                                 $expiry[$action] = $dbw->getInfinity();
2278                         }
2279                         if ( !isset( $limit[$action] ) ) {
2280                                 $limit[$action] = '';
2281                         } elseif ( $limit[$action] != '' ) {
2282                                 $protect = true;
2283                         }
2284
2285                         // Get current restrictions on $action
2286                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2287                         if ( $current != '' ) {
2288                                 $isProtected = true;
2289                         }
2290
2291                         if ( $limit[$action] != $current ) {
2292                                 $changed = true;
2293                         } elseif ( $limit[$action] != '' ) {
2294                                 // Only check expiry change if the action is actually being
2295                                 // protected, since expiry does nothing on an not-protected
2296                                 // action.
2297                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2298                                         $changed = true;
2299                                 }
2300                         }
2301                 }
2302
2303                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2304                         $changed = true;
2305                 }
2306
2307                 // If nothing has changed, do nothing
2308                 if ( !$changed ) {
2309                         return Status::newGood();
2310                 }
2311
2312                 if ( !$protect ) { // No protection at all means unprotection
2313                         $revCommentMsg = 'unprotectedarticle';
2314                         $logAction = 'unprotect';
2315                 } elseif ( $isProtected ) {
2316                         $revCommentMsg = 'modifiedarticleprotection';
2317                         $logAction = 'modify';
2318                 } else {
2319                         $revCommentMsg = 'protectedarticle';
2320                         $logAction = 'protect';
2321                 }
2322
2323                 if ( $id ) { // Protection of existing page
2324                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2325                                 return Status::newGood();
2326                         }
2327
2328                         // Only certain restrictions can cascade...
2329                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2330                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2331                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2332                         }
2333                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2334                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2335                         }
2336
2337                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2338                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2339                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2340                         }
2341                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2342                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2343                         }
2344
2345                         // The schema allows multiple restrictions
2346                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2347                                 $cascade = false;
2348                         }
2349
2350                         // insert null revision to identify the page protection change as edit summary
2351                         $latest = $this->getLatest();
2352                         $nullRevision = $this->insertProtectNullRevision( $revCommentMsg, $limit, $expiry, $cascade, $reason );
2353                         if ( $nullRevision === null ) {
2354                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2355                         }
2356
2357                         // Update restrictions table
2358                         foreach ( $limit as $action => $restrictions ) {
2359                                 if ( $restrictions != '' ) {
2360                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2361                                                 array( 'pr_page' => $id,
2362                                                         'pr_type' => $action,
2363                                                         'pr_level' => $restrictions,
2364                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2365                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2366                                                 ),
2367                                                 __METHOD__
2368                                         );
2369                                 } else {
2370                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2371                                                 'pr_type' => $action ), __METHOD__ );
2372                                 }
2373                         }
2374
2375                         // Clear out legacy restriction fields
2376                         $dbw->update(
2377                                 'page',
2378                                 array( 'page_restrictions' => '' ),
2379                                 array( 'page_id' => $id ),
2380                                 __METHOD__
2381                         );
2382
2383                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2384                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2385                 } else { // Protection of non-existing page (also known as "title protection")
2386                         // Cascade protection is meaningless in this case
2387                         $cascade = false;
2388
2389                         if ( $limit['create'] != '' ) {
2390                                 $dbw->replace( 'protected_titles',
2391                                         array( array( 'pt_namespace', 'pt_title' ) ),
2392                                         array(
2393                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2394                                                 'pt_title' => $this->mTitle->getDBkey(),
2395                                                 'pt_create_perm' => $limit['create'],
2396                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
2397                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2398                                                 'pt_user' => $user->getId(),
2399                                                 'pt_reason' => $reason,
2400                                         ), __METHOD__
2401                                 );
2402                         } else {
2403                                 $dbw->delete( 'protected_titles',
2404                                         array(
2405                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2406                                                 'pt_title' => $this->mTitle->getDBkey()
2407                                         ), __METHOD__
2408                                 );
2409                         }
2410                 }
2411
2412                 $this->mTitle->flushRestrictions();
2413                 InfoAction::invalidateCache( $this->mTitle );
2414
2415                 if ( $logAction == 'unprotect' ) {
2416                         $params = array();
2417                 } else {
2418                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2419                         $params = array( $protectDescriptionLog, $cascade ? 'cascade' : '' );
2420                 }
2421
2422                 // Update the protection log
2423                 $log = new LogPage( 'protect' );
2424                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $params, $user );
2425
2426                 return Status::newGood();
2427         }
2428
2429         /**
2430          * Insert a new null revision for this page.
2431          *
2432          * @param string $revCommentMsg comment message key for the revision
2433          * @param array $limit set of restriction keys
2434          * @param array $expiry per restriction type expiration
2435          * @param int $cascade Set to false if cascading protection isn't allowed.
2436          * @param string $reason
2437          * @return Revision|null on error
2438          */
2439         public function insertProtectNullRevision( $revCommentMsg, array $limit, array $expiry, $cascade, $reason ) {
2440                 global $wgContLang;
2441                 $dbw = wfGetDB( DB_MASTER );
2442
2443                 // Prepare a null revision to be added to the history
2444                 $editComment = $wgContLang->ucfirst(
2445                         wfMessage(
2446                                 $revCommentMsg,
2447                                 $this->mTitle->getPrefixedText()
2448                         )->inContentLanguage()->text()
2449                 );
2450                 if ( $reason ) {
2451                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2452                 }
2453                 $protectDescription = $this->protectDescription( $limit, $expiry );
2454                 if ( $protectDescription ) {
2455                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2456                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )->inContentLanguage()->text();
2457                 }
2458                 if ( $cascade ) {
2459                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2460                         $editComment .= wfMessage( 'brackets' )->params(
2461                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2462                         )->inContentLanguage()->text();
2463                 }
2464
2465                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true );
2466                 if ( $nullRev ) {
2467                         $nullRev->insertOn( $dbw );
2468
2469                         // Update page record and touch page
2470                         $oldLatest = $nullRev->getParentId();
2471                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2472                 }
2473
2474                 return $nullRev;
2475         }
2476
2477         /**
2478          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2479          * @return string
2480          */
2481         protected function formatExpiry( $expiry ) {
2482                 global $wgContLang;
2483                 $dbr = wfGetDB( DB_SLAVE );
2484
2485                 $encodedExpiry = $dbr->encodeExpiry( $expiry );
2486                 if ( $encodedExpiry != 'infinity' ) {
2487                         return wfMessage(
2488                                 'protect-expiring',
2489                                 $wgContLang->timeanddate( $expiry, false, false ),
2490                                 $wgContLang->date( $expiry, false, false ),
2491                                 $wgContLang->time( $expiry, false, false )
2492                         )->inContentLanguage()->text();
2493                 } else {
2494                         return wfMessage( 'protect-expiry-indefinite' )
2495                                 ->inContentLanguage()->text();
2496                 }
2497         }
2498
2499         /**
2500          * Builds the description to serve as comment for the edit.
2501          *
2502          * @param array $limit set of restriction keys
2503          * @param array $expiry per restriction type expiration
2504          * @return string
2505          */
2506         public function protectDescription( array $limit, array $expiry ) {
2507                 $protectDescription = '';
2508
2509                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2510                         # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
2511                         # All possible message keys are listed here for easier grepping:
2512                         # * restriction-create
2513                         # * restriction-edit
2514                         # * restriction-move
2515                         # * restriction-upload
2516                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2517                         # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
2518                         # with '' filtered out. All possible message keys are listed below:
2519                         # * protect-level-autoconfirmed
2520                         # * protect-level-sysop
2521                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )->inContentLanguage()->text();
2522
2523                         $expiryText = $this->formatExpiry( $expiry[$action] );
2524
2525                         if ( $protectDescription !== '' ) {
2526                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2527                         }
2528                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2529                                 ->params( $actionText, $restrictionsText, $expiryText )
2530                                 ->inContentLanguage()->text();
2531                 }
2532
2533                 return $protectDescription;
2534         }
2535
2536         /**
2537          * Builds the description to serve as comment for the log entry.
2538          *
2539          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2540          * protect description text. Keep them in old format to avoid breaking compatibility.
2541          * TODO: Fix protection log to store structured description and format it on-the-fly.
2542          *
2543          * @param array $limit set of restriction keys
2544          * @param array $expiry per restriction type expiration
2545          * @return string
2546          */
2547         public function protectDescriptionLog( array $limit, array $expiry ) {
2548                 global $wgContLang;
2549
2550                 $protectDescriptionLog = '';
2551
2552                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2553                         $expiryText = $this->formatExpiry( $expiry[$action] );
2554                         $protectDescriptionLog .= $wgContLang->getDirMark() . "[$action=$restrictions] ($expiryText)";
2555                 }
2556
2557                 return trim( $protectDescriptionLog );
2558         }
2559
2560         /**
2561          * Take an array of page restrictions and flatten it to a string
2562          * suitable for insertion into the page_restrictions field.
2563          * @param $limit Array
2564          * @throws MWException
2565          * @return String
2566          */
2567         protected static function flattenRestrictions( $limit ) {
2568                 if ( !is_array( $limit ) ) {
2569                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2570                 }
2571
2572                 $bits = array();
2573                 ksort( $limit );
2574
2575                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2576                         $bits[] = "$action=$restrictions";
2577                 }
2578
2579                 return implode( ':', $bits );
2580         }
2581
2582         /**
2583          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2584          * backwards compatibility, if you care about error reporting you should use
2585          * doDeleteArticleReal() instead.
2586          *
2587          * Deletes the article with database consistency, writes logs, purges caches
2588          *
2589          * @param string $reason delete reason for deletion log
2590          * @param $suppress boolean suppress all revisions and log the deletion in
2591          *        the suppression log instead of the deletion log
2592          * @param int $id article ID
2593          * @param $commit boolean defaults to true, triggers transaction end
2594          * @param &$error Array of errors to append to
2595          * @param $user User The deleting user
2596          * @return boolean true if successful
2597          */
2598         public function doDeleteArticle(
2599                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2600         ) {
2601                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2602                 return $status->isGood();
2603         }
2604
2605         /**
2606          * Back-end article deletion
2607          * Deletes the article with database consistency, writes logs, purges caches
2608          *
2609          * @since 1.19
2610          *
2611          * @param string $reason delete reason for deletion log
2612          * @param $suppress boolean suppress all revisions and log the deletion in
2613          *        the suppression log instead of the deletion log
2614          * @param int $id article ID
2615          * @param $commit boolean defaults to true, triggers transaction end
2616          * @param &$error Array of errors to append to
2617          * @param $user User The deleting user
2618          * @return Status: Status object; if successful, $status->value is the log_id of the
2619          *                 deletion log entry. If the page couldn't be deleted because it wasn't
2620          *                 found, $status is a non-fatal 'cannotdelete' error
2621          */
2622         public function doDeleteArticleReal(
2623                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2624         ) {
2625                 global $wgUser, $wgContentHandlerUseDB;
2626
2627                 wfDebug( __METHOD__ . "\n" );
2628
2629                 $status = Status::newGood();
2630
2631                 if ( $this->mTitle->getDBkey() === '' ) {
2632                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2633                         return $status;
2634                 }
2635
2636                 $user = is_null( $user ) ? $wgUser : $user;
2637                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2638                         if ( $status->isOK() ) {
2639                                 // Hook aborted but didn't set a fatal status
2640                                 $status->fatal( 'delete-hook-aborted' );
2641                         }
2642                         return $status;
2643                 }
2644
2645                 if ( $id == 0 ) {
2646                         $this->loadPageData( 'forupdate' );
2647                         $id = $this->getID();
2648                         if ( $id == 0 ) {
2649                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2650                                 return $status;
2651                         }
2652                 }
2653
2654                 // Bitfields to further suppress the content
2655                 if ( $suppress ) {
2656                         $bitfield = 0;
2657                         // This should be 15...
2658                         $bitfield |= Revision::DELETED_TEXT;
2659                         $bitfield |= Revision::DELETED_COMMENT;
2660                         $bitfield |= Revision::DELETED_USER;
2661                         $bitfield |= Revision::DELETED_RESTRICTED;
2662                 } else {
2663                         $bitfield = 'rev_deleted';
2664                 }
2665
2666                 // we need to remember the old content so we can use it to generate all deletion updates.
2667                 $content = $this->getContent( Revision::RAW );
2668
2669                 $dbw = wfGetDB( DB_MASTER );
2670                 $dbw->begin( __METHOD__ );
2671                 // For now, shunt the revision data into the archive table.
2672                 // Text is *not* removed from the text table; bulk storage
2673                 // is left intact to avoid breaking block-compression or
2674                 // immutable storage schemes.
2675                 //
2676                 // For backwards compatibility, note that some older archive
2677                 // table entries will have ar_text and ar_flags fields still.
2678                 //
2679                 // In the future, we may keep revisions and mark them with
2680                 // the rev_deleted field, which is reserved for this purpose.
2681
2682                 $row = array(
2683                         'ar_namespace'  => 'page_namespace',
2684                         'ar_title'      => 'page_title',
2685                         'ar_comment'    => 'rev_comment',
2686                         'ar_user'       => 'rev_user',
2687                         'ar_user_text'  => 'rev_user_text',
2688                         'ar_timestamp'  => 'rev_timestamp',
2689                         'ar_minor_edit' => 'rev_minor_edit',
2690                         'ar_rev_id'     => 'rev_id',
2691                         'ar_parent_id'  => 'rev_parent_id',
2692                         'ar_text_id'    => 'rev_text_id',
2693                         'ar_text'       => '\'\'', // Be explicit to appease
2694                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2695                         'ar_len'        => 'rev_len',
2696                         'ar_page_id'    => 'page_id',
2697                         'ar_deleted'    => $bitfield,
2698                         'ar_sha1'       => 'rev_sha1',
2699                 );
2700
2701                 if ( $wgContentHandlerUseDB ) {
2702                         $row['ar_content_model'] = 'rev_content_model';
2703                         $row['ar_content_format'] = 'rev_content_format';
2704                 }
2705
2706                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2707                         $row,
2708                         array(
2709                                 'page_id' => $id,
2710                                 'page_id = rev_page'
2711                         ), __METHOD__
2712                 );
2713
2714                 // Now that it's safely backed up, delete it
2715                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2716                 $ok = ( $dbw->affectedRows() > 0 ); // $id could be laggy
2717
2718                 if ( !$ok ) {
2719                         $dbw->rollback( __METHOD__ );
2720                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2721                         return $status;
2722                 }
2723
2724                 if ( !$dbw->cascadingDeletes() ) {
2725                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2726                 }
2727
2728                 $this->doDeleteUpdates( $id, $content );
2729
2730                 // Log the deletion, if the page was suppressed, log it at Oversight instead
2731                 $logtype = $suppress ? 'suppress' : 'delete';
2732
2733                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2734                 $logEntry->setPerformer( $user );
2735                 $logEntry->setTarget( $this->mTitle );
2736                 $logEntry->setComment( $reason );
2737                 $logid = $logEntry->insert();
2738                 $logEntry->publish( $logid );
2739
2740                 if ( $commit ) {
2741                         $dbw->commit( __METHOD__ );
2742                 }
2743
2744                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id, $content, $logEntry ) );
2745                 $status->value = $logid;
2746                 return $status;
2747         }
2748
2749         /**
2750          * Do some database updates after deletion
2751          *
2752          * @param int $id page_id value of the page being deleted
2753          * @param $content Content: optional page content to be used when determining the required updates.
2754          *        This may be needed because $this->getContent() may already return null when the page proper was deleted.
2755          */
2756         public function doDeleteUpdates( $id, Content $content = null ) {
2757                 // update site status
2758                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2759
2760                 // remove secondary indexes, etc
2761                 $updates = $this->getDeletionUpdates( $content );
2762                 DataUpdate::runUpdates( $updates );
2763
2764                 // Reparse any pages transcluding this page
2765                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
2766
2767                 // Clear caches
2768                 WikiPage::onArticleDelete( $this->mTitle );
2769
2770                 // Reset this object and the Title object
2771                 $this->loadFromRow( false, self::READ_LATEST );
2772
2773                 // Search engine
2774                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
2775         }
2776
2777         /**
2778          * Roll back the most recent consecutive set of edits to a page
2779          * from the same user; fails if there are no eligible edits to
2780          * roll back to, e.g. user is the sole contributor. This function
2781          * performs permissions checks on $user, then calls commitRollback()
2782          * to do the dirty work
2783          *
2784          * @todo Separate the business/permission stuff out from backend code
2785          *
2786          * @param string $fromP Name of the user whose edits to rollback.
2787          * @param string $summary Custom summary. Set to default summary if empty.
2788          * @param string $token Rollback token.
2789          * @param $bot Boolean: If true, mark all reverted edits as bot.
2790          *
2791          * @param array $resultDetails contains result-specific array of additional values
2792          *    'alreadyrolled' : 'current' (rev)
2793          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2794          *
2795          * @param $user User The user performing the rollback
2796          * @return array of errors, each error formatted as
2797          *   array(messagekey, param1, param2, ...).
2798          * On success, the array is empty.  This array can also be passed to
2799          * OutputPage::showPermissionsErrorPage().
2800          */
2801         public function doRollback(
2802                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2803         ) {
2804                 $resultDetails = null;
2805
2806                 // Check permissions
2807                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2808                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2809                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2810
2811                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2812                         $errors[] = array( 'sessionfailure' );
2813                 }
2814
2815                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2816                         $errors[] = array( 'actionthrottledtext' );
2817                 }
2818
2819                 // If there were errors, bail out now
2820                 if ( !empty( $errors ) ) {
2821                         return $errors;
2822                 }
2823
2824                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2825         }
2826
2827         /**
2828          * Backend implementation of doRollback(), please refer there for parameter
2829          * and return value documentation
2830          *
2831          * NOTE: This function does NOT check ANY permissions, it just commits the
2832          * rollback to the DB. Therefore, you should only call this function direct-
2833          * ly if you want to use custom permissions checks. If you don't, use
2834          * doRollback() instead.
2835          * @param string $fromP Name of the user whose edits to rollback.
2836          * @param string $summary Custom summary. Set to default summary if empty.
2837          * @param $bot Boolean: If true, mark all reverted edits as bot.
2838          *
2839          * @param array $resultDetails contains result-specific array of additional values
2840          * @param $guser User The user performing the rollback
2841          * @return array
2842          */
2843         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2844                 global $wgUseRCPatrol, $wgContLang;
2845
2846                 $dbw = wfGetDB( DB_MASTER );
2847
2848                 if ( wfReadOnly() ) {
2849                         return array( array( 'readonlytext' ) );
2850                 }
2851
2852                 // Get the last editor
2853                 $current = $this->getRevision();
2854                 if ( is_null( $current ) ) {
2855                         // Something wrong... no page?
2856                         return array( array( 'notanarticle' ) );
2857                 }
2858
2859                 $from = str_replace( '_', ' ', $fromP );
2860                 // User name given should match up with the top revision.
2861                 // If the user was deleted then $from should be empty.
2862                 if ( $from != $current->getUserText() ) {
2863                         $resultDetails = array( 'current' => $current );
2864                         return array( array( 'alreadyrolled',
2865                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2866                                 htmlspecialchars( $fromP ),
2867                                 htmlspecialchars( $current->getUserText() )
2868                         ) );
2869                 }
2870
2871                 // Get the last edit not by this guy...
2872                 // Note: these may not be public values
2873                 $user = intval( $current->getRawUser() );
2874                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2875                 $s = $dbw->selectRow( 'revision',
2876                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2877                         array( 'rev_page' => $current->getPage(),
2878                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2879                         ), __METHOD__,
2880                         array( 'USE INDEX' => 'page_timestamp',
2881                                 'ORDER BY' => 'rev_timestamp DESC' )
2882                         );
2883                 if ( $s === false ) {
2884                         // No one else ever edited this page
2885                         return array( array( 'cantrollback' ) );
2886                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2887                         // Only admins can see this text
2888                         return array( array( 'notvisiblerev' ) );
2889                 }
2890
2891                 $set = array();
2892                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2893                         // Mark all reverted edits as bot
2894                         $set['rc_bot'] = 1;
2895                 }
2896
2897                 if ( $wgUseRCPatrol ) {
2898                         // Mark all reverted edits as patrolled
2899                         $set['rc_patrolled'] = 1;
2900                 }
2901
2902                 if ( count( $set ) ) {
2903                         $dbw->update( 'recentchanges', $set,
2904                                 array( /* WHERE */
2905                                         'rc_cur_id' => $current->getPage(),
2906                                         'rc_user_text' => $current->getUserText(),
2907                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
2908                                 ), __METHOD__
2909                         );
2910                 }
2911
2912                 // Generate the edit summary if necessary
2913                 $target = Revision::newFromId( $s->rev_id );
2914                 if ( empty( $summary ) ) {
2915                         if ( $from == '' ) { // no public user name
2916                                 $summary = wfMessage( 'revertpage-nouser' );
2917                         } else {
2918                                 $summary = wfMessage( 'revertpage' );
2919                         }
2920                 }
2921
2922                 // Allow the custom summary to use the same args as the default message
2923                 $args = array(
2924                         $target->getUserText(), $from, $s->rev_id,
2925                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2926                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2927                 );
2928                 if ( $summary instanceof Message ) {
2929                         $summary = $summary->params( $args )->inContentLanguage()->text();
2930                 } else {
2931                         $summary = wfMsgReplaceArgs( $summary, $args );
2932                 }
2933
2934                 // Trim spaces on user supplied text
2935                 $summary = trim( $summary );
2936
2937                 // Truncate for whole multibyte characters.
2938                 $summary = $wgContLang->truncate( $summary, 255 );
2939
2940                 // Save
2941                 $flags = EDIT_UPDATE;
2942
2943                 if ( $guser->isAllowed( 'minoredit' ) ) {
2944                         $flags |= EDIT_MINOR;
2945                 }
2946
2947                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2948                         $flags |= EDIT_FORCE_BOT;
2949                 }
2950
2951                 // Actually store the edit
2952                 $status = $this->doEditContent( $target->getContent(), $summary, $flags, $target->getId(), $guser );
2953
2954                 if ( !$status->isOK() ) {
2955                         return $status->getErrorsArray();
2956                 }
2957
2958                 if ( !empty( $status->value['revision'] ) ) {
2959                         $revId = $status->value['revision']->getId();
2960                 } else {
2961                         $revId = false;
2962                 }
2963
2964                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2965
2966                 $resultDetails = array(
2967                         'summary' => $summary,
2968                         'current' => $current,
2969                         'target' => $target,
2970                         'newid' => $revId
2971                 );
2972
2973                 return array();
2974         }
2975
2976         /**
2977          * The onArticle*() functions are supposed to be a kind of hooks
2978          * which should be called whenever any of the specified actions
2979          * are done.
2980          *
2981          * This is a good place to put code to clear caches, for instance.
2982          *
2983          * This is called on page move and undelete, as well as edit
2984          *
2985          * @param $title Title object
2986          */
2987         public static function onArticleCreate( $title ) {
2988                 // Update existence markers on article/talk tabs...
2989                 if ( $title->isTalkPage() ) {
2990                         $other = $title->getSubjectPage();
2991                 } else {
2992                         $other = $title->getTalkPage();
2993                 }
2994
2995                 $other->invalidateCache();
2996                 $other->purgeSquid();
2997
2998                 $title->touchLinks();
2999                 $title->purgeSquid();
3000                 $title->deleteTitleProtection();
3001         }
3002
3003         /**
3004          * Clears caches when article is deleted
3005          *
3006          * @param $title Title
3007          */
3008         public static function onArticleDelete( $title ) {
3009                 // Update existence markers on article/talk tabs...
3010                 if ( $title->isTalkPage() ) {
3011                         $other = $title->getSubjectPage();
3012                 } else {
3013                         $other = $title->getTalkPage();
3014                 }
3015
3016                 $other->invalidateCache();
3017                 $other->purgeSquid();
3018
3019                 $title->touchLinks();
3020                 $title->purgeSquid();
3021
3022                 // File cache
3023                 HTMLFileCache::clearFileCache( $title );
3024                 InfoAction::invalidateCache( $title );
3025
3026                 // Messages
3027                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3028                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3029                 }
3030
3031                 // Images
3032                 if ( $title->getNamespace() == NS_FILE ) {
3033                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3034                         $update->doUpdate();
3035                 }
3036
3037                 // User talk pages
3038                 if ( $title->getNamespace() == NS_USER_TALK ) {
3039                         $user = User::newFromName( $title->getText(), false );
3040                         if ( $user ) {
3041                                 $user->setNewtalk( false );
3042                         }
3043                 }
3044
3045                 // Image redirects
3046                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3047         }
3048
3049         /**
3050          * Purge caches on page update etc
3051          *
3052          * @param $title Title object
3053          * @todo Verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
3054          */
3055         public static function onArticleEdit( $title ) {
3056                 // Invalidate caches of articles which include this page
3057                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
3058
3059                 // Invalidate the caches of all pages which redirect here
3060                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
3061
3062                 // Purge squid for this page only
3063                 $title->purgeSquid();
3064
3065                 // Clear file cache for this page only
3066                 HTMLFileCache::clearFileCache( $title );
3067                 InfoAction::invalidateCache( $title );
3068         }
3069
3070         /**#@-*/
3071
3072         /**
3073          * Returns a list of categories this page is a member of.
3074          * Results will include hidden categories
3075          *
3076          * @return TitleArray
3077          */
3078         public function getCategories() {
3079                 $id = $this->getId();
3080                 if ( $id == 0 ) {
3081                         return TitleArray::newFromResult( new FakeResultWrapper( array() ) );
3082                 }
3083
3084                 $dbr = wfGetDB( DB_SLAVE );
3085                 $res = $dbr->select( 'categorylinks',
3086                         array( 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ),
3087                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3088                         // as not being aliases, and NS_CATEGORY is numeric
3089                         array( 'cl_from' => $id ),
3090                         __METHOD__ );
3091
3092                 return TitleArray::newFromResult( $res );
3093         }
3094
3095         /**
3096          * Returns a list of hidden categories this page is a member of.
3097          * Uses the page_props and categorylinks tables.
3098          *
3099          * @return Array of Title objects
3100          */
3101         public function getHiddenCategories() {
3102                 $result = array();
3103                 $id = $this->getId();
3104
3105                 if ( $id == 0 ) {
3106                         return array();
3107                 }
3108
3109                 $dbr = wfGetDB( DB_SLAVE );
3110                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3111                         array( 'cl_to' ),
3112                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3113                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
3114                         __METHOD__ );
3115
3116                 if ( $res !== false ) {
3117                         foreach ( $res as $row ) {
3118                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3119                         }
3120                 }
3121
3122                 return $result;
3123         }
3124
3125         /**
3126          * Return an applicable autosummary if one exists for the given edit.
3127          * @param string|null $oldtext the previous text of the page.
3128          * @param string|null $newtext The submitted text of the page.
3129          * @param int $flags bitmask: a bitmask of flags submitted for the edit.
3130          * @return string An appropriate autosummary, or an empty string.
3131          *
3132          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3133          */
3134         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3135                 // NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
3136
3137                 ContentHandler::deprecated( __METHOD__, '1.21' );
3138
3139                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3140                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3141                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3142
3143                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3144         }
3145
3146         /**
3147          * Auto-generates a deletion reason
3148          *
3149          * @param &$hasHistory Boolean: whether the page has a history
3150          * @return mixed String containing deletion reason or empty string, or boolean false
3151          *    if no revision occurred
3152          */
3153         public function getAutoDeleteReason( &$hasHistory ) {
3154                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3155         }
3156
3157         /**
3158          * Update all the appropriate counts in the category table, given that
3159          * we've added the categories $added and deleted the categories $deleted.
3160          *
3161          * @param array $added   The names of categories that were added
3162          * @param array $deleted The names of categories that were deleted
3163          */
3164         public function updateCategoryCounts( array $added, array $deleted ) {
3165                 $that = $this;
3166                 $method = __METHOD__;
3167                 $dbw = wfGetDB( DB_MASTER );
3168
3169                 // Do this at the end of the commit to reduce lock wait timeouts
3170                 $dbw->onTransactionPreCommitOrIdle(
3171                         function() use ( $dbw, $that, $method, $added, $deleted ) {
3172                                 $ns = $that->getTitle()->getNamespace();
3173
3174                                 $addFields = array( 'cat_pages = cat_pages + 1' );
3175                                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3176                                 if ( $ns == NS_CATEGORY ) {
3177                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3178                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3179                                 } elseif ( $ns == NS_FILE ) {
3180                                         $addFields[] = 'cat_files = cat_files + 1';
3181                                         $removeFields[] = 'cat_files = cat_files - 1';
3182                                 }
3183
3184                                 if ( count( $added ) ) {
3185                                         $insertRows = array();
3186                                         foreach ( $added as $cat ) {
3187                                                 $insertRows[] = array(
3188                                                         'cat_title'   => $cat,
3189                                                         'cat_pages'   => 1,
3190                                                         'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3191                                                         'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3192                                                 );
3193                                         }
3194                                         $dbw->upsert(
3195                                                 'category',
3196                                                 $insertRows,
3197                                                 array( 'cat_title' ),
3198                                                 $addFields,
3199                                                 $method
3200                                         );
3201                                 }
3202
3203                                 if ( count( $deleted ) ) {
3204                                         $dbw->update(
3205                                                 'category',
3206                                                 $removeFields,
3207                                                 array( 'cat_title' => $deleted ),
3208                                                 $method
3209                                         );
3210                                 }
3211
3212                                 foreach ( $added as $catName ) {
3213                                         $cat = Category::newFromName( $catName );
3214                                         wfRunHooks( 'CategoryAfterPageAdded', array( $cat, $that ) );
3215                                 }
3216
3217                                 foreach ( $deleted as $catName ) {
3218                                         $cat = Category::newFromName( $catName );
3219                                         wfRunHooks( 'CategoryAfterPageRemoved', array( $cat, $that ) );
3220                                 }
3221                         }
3222                 );
3223         }
3224
3225         /**
3226          * Updates cascading protections
3227          *
3228          * @param $parserOutput ParserOutput object for the current version
3229          */
3230         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
3231                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
3232                         return;
3233                 }
3234
3235                 // templatelinks table may have become out of sync,
3236                 // especially if using variable-based transclusions.
3237                 // For paranoia, check if things have changed and if
3238                 // so apply updates to the database. This will ensure
3239                 // that cascaded protections apply as soon as the changes
3240                 // are visible.
3241
3242                 // Get templates from templatelinks
3243                 $id = $this->getId();
3244
3245                 $tlTemplates = array();
3246
3247                 $dbr = wfGetDB( DB_SLAVE );
3248                 $res = $dbr->select( array( 'templatelinks' ),
3249                         array( 'tl_namespace', 'tl_title' ),
3250                         array( 'tl_from' => $id ),
3251                         __METHOD__
3252                 );
3253
3254                 foreach ( $res as $row ) {
3255                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3256                 }
3257
3258                 // Get templates from parser output.
3259                 $poTemplates = array();
3260                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3261                         foreach ( $templates as $dbk => $id ) {
3262                                 $poTemplates["$ns:$dbk"] = true;
3263                         }
3264                 }
3265
3266                 // Get the diff
3267                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3268
3269                 if ( count( $templates_diff ) > 0 ) {
3270                         // Whee, link updates time.
3271                         // Note: we are only interested in links here. We don't need to get other DataUpdate items from the parser output.
3272                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3273                         $u->doUpdate();
3274                 }
3275         }
3276
3277         /**
3278          * Return a list of templates used by this article.
3279          * Uses the templatelinks table
3280          *
3281          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
3282          * @return Array of Title objects
3283          */
3284         public function getUsedTemplates() {
3285                 return $this->mTitle->getTemplateLinksFrom();
3286         }
3287
3288         /**
3289          * Perform article updates on a special page creation.
3290          *
3291          * @param $rev Revision object
3292          *
3293          * @todo This is a shitty interface function. Kill it and replace the
3294          * other shitty functions like doEditUpdates and such so it's not needed
3295          * anymore.
3296          * @deprecated since 1.18, use doEditUpdates()
3297          */
3298         public function createUpdates( $rev ) {
3299                 wfDeprecated( __METHOD__, '1.18' );
3300                 global $wgUser;
3301                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
3302         }
3303
3304         /**
3305          * This function is called right before saving the wikitext,
3306          * so we can do things like signatures and links-in-context.
3307          *
3308          * @deprecated in 1.19; use Parser::preSaveTransform() instead
3309          * @param string $text article contents
3310          * @param $user User object: user doing the edit
3311          * @param $popts ParserOptions object: parser options, default options for
3312          *               the user loaded if null given
3313          * @return string article contents with altered wikitext markup (signatures
3314          *      converted, {{subst:}}, templates, etc.)
3315          */
3316         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3317                 global $wgParser, $wgUser;
3318
3319                 wfDeprecated( __METHOD__, '1.19' );
3320
3321                 $user = is_null( $user ) ? $wgUser : $user;
3322
3323                 if ( $popts === null ) {
3324                         $popts = ParserOptions::newFromUser( $user );
3325                 }
3326
3327                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3328         }
3329
3330         /**
3331          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
3332          *
3333          * @deprecated in 1.19; use Title::isBigDeletion() instead.
3334          * @return bool
3335          */
3336         public function isBigDeletion() {
3337                 wfDeprecated( __METHOD__, '1.19' );
3338                 return $this->mTitle->isBigDeletion();
3339         }
3340
3341         /**
3342          * Get the  approximate revision count of this page.
3343          *
3344          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
3345          * @return int
3346          */
3347         public function estimateRevisionCount() {
3348                 wfDeprecated( __METHOD__, '1.19' );
3349                 return $this->mTitle->estimateRevisionCount();
3350         }
3351
3352         /**
3353          * Update the article's restriction field, and leave a log entry.
3354          *
3355          * @deprecated since 1.19
3356          * @param array $limit set of restriction keys
3357          * @param $reason String
3358          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
3359          * @param array $expiry per restriction type expiration
3360          * @param $user User The user updating the restrictions
3361          * @return bool true on success
3362          */
3363         public function updateRestrictions(
3364                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3365         ) {
3366                 global $wgUser;
3367
3368                 $user = is_null( $user ) ? $wgUser : $user;
3369
3370                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3371         }
3372
3373         /**
3374          * @deprecated since 1.18
3375          */
3376         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3377                 wfDeprecated( __METHOD__, '1.18' );
3378                 global $wgUser;
3379                 $this->doQuickEdit( $text, $wgUser, $comment, $minor );
3380         }
3381
3382         /**
3383          * @deprecated since 1.18
3384          */
3385         public function viewUpdates() {
3386                 wfDeprecated( __METHOD__, '1.18' );
3387                 global $wgUser;
3388                 $this->doViewUpdates( $wgUser );
3389         }
3390
3391         /**
3392          * @deprecated since 1.18
3393          * @param $oldid int
3394          * @return bool
3395          */
3396         public function useParserCache( $oldid ) {
3397                 wfDeprecated( __METHOD__, '1.18' );
3398                 global $wgUser;
3399                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
3400         }
3401
3402         /**
3403          * Returns a list of updates to be performed when this page is deleted. The updates should remove any information
3404          * about this page from secondary data stores such as links tables.
3405          *
3406          * @param Content|null $content optional Content object for determining the necessary updates
3407          * @return Array an array of DataUpdates objects
3408          */
3409         public function getDeletionUpdates( Content $content = null ) {
3410                 if ( !$content ) {
3411                         // load content object, which may be used to determine the necessary updates
3412                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3413                         $content = $this->getContent( Revision::RAW );
3414                 }
3415
3416                 if ( !$content ) {
3417                         $updates = array();
3418                 } else {
3419                         $updates = $content->getDeletionUpdates( $this );
3420                 }
3421
3422                 wfRunHooks( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3423                 return $updates;
3424         }
3425
3426 }
3427
3428 class PoolWorkArticleView extends PoolCounterWork {
3429
3430         /**
3431          * @var Page
3432          */
3433         private $page;
3434
3435         /**
3436          * @var string
3437          */
3438         private $cacheKey;
3439
3440         /**
3441          * @var integer
3442          */
3443         private $revid;
3444
3445         /**
3446          * @var ParserOptions
3447          */
3448         private $parserOptions;
3449
3450         /**
3451          * @var Content|null
3452          */
3453         private $content = null;
3454
3455         /**
3456          * @var ParserOutput|bool
3457          */
3458         private $parserOutput = false;
3459
3460         /**
3461          * @var bool
3462          */
3463         private $isDirty = false;
3464
3465         /**
3466          * @var Status|bool
3467          */
3468         private $error = false;
3469
3470         /**
3471          * Constructor
3472          *
3473          * @param $page Page|WikiPage
3474          * @param $revid Integer: ID of the revision being parsed
3475          * @param $useParserCache Boolean: whether to use the parser cache
3476          * @param $parserOptions parserOptions to use for the parse operation
3477          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
3478          */
3479         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null ) {
3480                 if ( is_string( $content ) ) { // BC: old style call
3481                         $modelId = $page->getRevision()->getContentModel();
3482                         $format = $page->getRevision()->getContentFormat();
3483                         $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelId, $format );
3484                 }
3485
3486                 $this->page = $page;
3487                 $this->revid = $revid;
3488                 $this->cacheable = $useParserCache;
3489                 $this->parserOptions = $parserOptions;
3490                 $this->content = $content;
3491                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3492                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3493         }
3494
3495         /**
3496          * Get the ParserOutput from this object, or false in case of failure
3497          *
3498          * @return ParserOutput
3499          */
3500         public function getParserOutput() {
3501                 return $this->parserOutput;
3502         }
3503
3504         /**
3505          * Get whether the ParserOutput is a dirty one (i.e. expired)
3506          *
3507          * @return bool
3508          */
3509         public function getIsDirty() {
3510                 return $this->isDirty;
3511         }
3512
3513         /**
3514          * Get a Status object in case of error or false otherwise
3515          *
3516          * @return Status|bool
3517          */
3518         public function getError() {
3519                 return $this->error;
3520         }
3521
3522         /**
3523          * @return bool
3524          */
3525         function doWork() {
3526                 global $wgUseFileCache;
3527
3528                 // @todo several of the methods called on $this->page are not declared in Page, but present
3529                 //        in WikiPage and delegated by Article.
3530
3531                 $isCurrent = $this->revid === $this->page->getLatest();
3532
3533                 if ( $this->content !== null ) {
3534                         $content = $this->content;
3535                 } elseif ( $isCurrent ) {
3536                         // XXX: why use RAW audience here, and PUBLIC (default) below?
3537                         $content = $this->page->getContent( Revision::RAW );
3538                 } else {
3539                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3540
3541                         if ( $rev === null ) {
3542                                 $content = null;
3543                         } else {
3544                                 // XXX: why use PUBLIC audience here (default), and RAW above?
3545                                 $content = $rev->getContent();
3546                         }
3547                 }
3548
3549                 if ( $content === null ) {
3550                         return false;
3551                 }
3552
3553                 // Reduce effects of race conditions for slow parses (bug 46014)
3554                 $cacheTime = wfTimestampNow();
3555
3556                 $time = - microtime( true );
3557                 $this->parserOutput = $content->getParserOutput( $this->page->getTitle(), $this->revid, $this->parserOptions );
3558                 $time += microtime( true );
3559
3560                 // Timing hack
3561                 if ( $time > 3 ) {
3562                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3563                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3564                 }
3565
3566                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
3567                         ParserCache::singleton()->save(
3568                                 $this->parserOutput, $this->page, $this->parserOptions, $cacheTime );
3569                 }
3570
3571                 // Make sure file cache is not used on uncacheable content.
3572                 // Output that has magic words in it can still use the parser cache
3573                 // (if enabled), though it will generally expire sooner.
3574                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3575                         $wgUseFileCache = false;
3576                 }
3577
3578                 if ( $isCurrent ) {
3579                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3580                 }
3581
3582                 return true;
3583         }
3584
3585         /**
3586          * @return bool
3587          */
3588         function getCachedWork() {
3589                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3590
3591                 if ( $this->parserOutput === false ) {
3592                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3593                         return false;
3594                 } else {
3595                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3596                         return true;
3597                 }
3598         }
3599
3600         /**
3601          * @return bool
3602          */
3603         function fallback() {
3604                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3605
3606                 if ( $this->parserOutput === false ) {
3607                         wfDebugLog( 'dirty', "dirty missing\n" );
3608                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3609                         return false;
3610                 } else {
3611                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3612                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
3613                         $this->isDirty = true;
3614                         return true;
3615                 }
3616         }
3617
3618         /**
3619          * @param $status Status
3620          * @return bool
3621          */
3622         function error( $status ) {
3623                 $this->error = $status;
3624                 return false;
3625         }
3626 }