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 immutable content against the cached one.
 249                 // Clearing it can cause extra parses on edit for no reason.
 250         }
 251
 252         /**
 253          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 254          * @return void
 255          * @since 1.23
 256          */
 257         public function clearPreparedEdit() {
 258                 $this->mPreparedEdit = false;
 259         }
 260
 261         /**
 262          * Return the list of revision fields that should be selected to create
 263          * a new page.
 264          *
 265          * @return array
 266          */
 267         public static function selectFields() {
 268                 global $wgContentHandlerUseDB;
 269
 270                 $fields = array(
 271                         'page_id',
 272                         'page_namespace',
 273                         'page_title',
 274                         'page_restrictions',
 275                         'page_counter',
 276                         'page_is_redirect',
 277                         'page_is_new',
 278                         'page_random',
 279                         'page_touched',
 280                         'page_latest',
 281                         'page_len',
 282                 );
 283
 284                 if ( $wgContentHandlerUseDB ) {
 285                         $fields[] = 'page_content_model';
 286                 }
 287
 288                 return $fields;
 289         }
 290
 291         /**
 292          * Fetch a page record with the given conditions
 293          * @param $dbr DatabaseBase object
 294          * @param $conditions Array
 295          * @param $options Array
 296          * @return mixed Database result resource, or false on failure
 297          */
 298         protected function pageData( $dbr, $conditions, $options = array() ) {
 299                 $fields = self::selectFields();
 300
 301                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 302
 303                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 304
 305                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 306
 307                 return $row;
 308         }
 309
 310         /**
 311          * Fetch a page record matching the Title object's namespace and title
 312          * using a sanitized title string
 313          *
 314          * @param $dbr DatabaseBase object
 315          * @param $title Title object
 316          * @param $options Array
 317          * @return mixed Database result resource, or false on failure
 318          */
 319         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 320                 return $this->pageData( $dbr, array(
 321                         'page_namespace' => $title->getNamespace(),
 322                         'page_title' => $title->getDBkey() ), $options );
 323         }
 324
 325         /**
 326          * Fetch a page record matching the requested ID
 327          *
 328          * @param $dbr DatabaseBase
 329          * @param $id Integer
 330          * @param $options Array
 331          * @return mixed Database result resource, or false on failure
 332          */
 333         public function pageDataFromId( $dbr, $id, $options = array() ) {
 334                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 335         }
 336
 337         /**
 338          * Set the general counter, title etc data loaded from
 339          * some source.
 340          *
 341          * @param $from object|string|int One of the following:
 342          *        - A DB query result object
 343          *        - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB
 344          *        - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB
 345          *        - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB using SELECT FOR UPDATE
 346          *
 347          * @return void
 348          */
 349         public function loadPageData( $from = 'fromdb' ) {
 350                 $from = self::convertSelectType( $from );
 351                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 352                         // We already have the data from the correct location, no need to load it twice.
 353                         return;
 354                 }
 355
 356                 if ( $from === self::READ_LOCKING ) {
 357                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 358                 } elseif ( $from === self::READ_LATEST ) {
 359                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 360                 } elseif ( $from === self::READ_NORMAL ) {
 361                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 362                         // Use a "last rev inserted" timestamp key to diminish the issue of slave lag.
 363                         // Note that DB also stores the master position in the session and checks it.
 364                         $touched = $this->getCachedLastEditTime();
 365                         if ( $touched ) { // key set
 366                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 367                                         $from = self::READ_LATEST;
 368                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 369                                 }
 370                         }
 371                 } else {
 372                         // No idea from where the caller got this data, assume slave database.
 373                         $data = $from;
 374                         $from = self::READ_NORMAL;
 375                 }
 376
 377                 $this->loadFromRow( $data, $from );
 378         }
 379
 380         /**
 381          * Load the object from a database row
 382          *
 383          * @since 1.20
 384          * @param $data object: database row containing at least fields returned
 385          *        by selectFields()
 386          * @param string|int $from One of the following:
 387          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 388          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 389          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from from
 390          *          the master DB using SELECT FOR UPDATE
 391          */
 392         public function loadFromRow( $data, $from ) {
 393                 $lc = LinkCache::singleton();
 394                 $lc->clearLink( $this->mTitle );
 395
 396                 if ( $data ) {
 397                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 398
 399                         $this->mTitle->loadFromRow( $data );
 400
 401                         // Old-fashioned restrictions
 402                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 403
 404                         $this->mId = intval( $data->page_id );
 405                         $this->mCounter = intval( $data->page_counter );
 406                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 407                         $this->mIsRedirect = intval( $data->page_is_redirect );
 408                         $this->mLatest = intval( $data->page_latest );
 409                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 410                         // Double-check the ID of any cached latest Revision object for consistency.
 411                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 412                                 $this->mLastRevision = null;
 413                                 $this->mTimestamp = '';
 414                         }
 415                 } else {
 416                         $lc->addBadLinkObj( $this->mTitle );
 417
 418                         $this->mTitle->loadFromRow( false );
 419
 420                         $this->clearCacheFields();
 421
 422                         $this->mId = 0;
 423                 }
 424
 425                 $this->mDataLoaded = true;
 426                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 427         }
 428
 429         /**
 430          * @return int Page ID
 431          */
 432         public function getId() {
 433                 if ( !$this->mDataLoaded ) {
 434                         $this->loadPageData();
 435                 }
 436                 return $this->mId;
 437         }
 438
 439         /**
 440          * @return bool Whether or not the page exists in the database
 441          */
 442         public function exists() {
 443                 if ( !$this->mDataLoaded ) {
 444                         $this->loadPageData();
 445                 }
 446                 return $this->mId > 0;
 447         }
 448
 449         /**
 450          * Check if this page is something we're going to be showing
 451          * some sort of sensible content for. If we return false, page
 452          * views (plain action=view) will return an HTTP 404 response,
 453          * so spiders and robots can know they're following a bad link.
 454          *
 455          * @return bool
 456          */
 457         public function hasViewableContent() {
 458                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 459         }
 460
 461         /**
 462          * @return int The view count for the page
 463          */
 464         public function getCount() {
 465                 if ( !$this->mDataLoaded ) {
 466                         $this->loadPageData();
 467                 }
 468
 469                 return $this->mCounter;
 470         }
 471
 472         /**
 473          * Tests if the article content represents a redirect
 474          *
 475          * @return bool
 476          */
 477         public function isRedirect() {
 478                 $content = $this->getContent();
 479                 if ( !$content ) {
 480                         return false;
 481                 }
 482
 483                 return $content->isRedirect();
 484         }
 485
 486         /**
 487          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 488          *
 489          * Will use the revisions actual content model if the page exists,
 490          * and the page's default if the page doesn't exist yet.
 491          *
 492          * @return String
 493          *
 494          * @since 1.21
 495          */
 496         public function getContentModel() {
 497                 if ( $this->exists() ) {
 498                         // look at the revision's actual content model
 499                         $rev = $this->getRevision();
 500
 501                         if ( $rev !== null ) {
 502                                 return $rev->getContentModel();
 503                         } else {
 504                                 $title = $this->mTitle->getPrefixedDBkey();
 505                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 506                         }
 507                 }
 508
 509                 // use the default model for this page
 510                 return $this->mTitle->getContentModel();
 511         }
 512
 513         /**
 514          * Loads page_touched and returns a value indicating if it should be used
 515          * @return boolean true if not a redirect
 516          */
 517         public function checkTouched() {
 518                 if ( !$this->mDataLoaded ) {
 519                         $this->loadPageData();
 520                 }
 521                 return !$this->mIsRedirect;
 522         }
 523
 524         /**
 525          * Get the page_touched field
 526          * @return string containing GMT timestamp
 527          */
 528         public function getTouched() {
 529                 if ( !$this->mDataLoaded ) {
 530                         $this->loadPageData();
 531                 }
 532                 return $this->mTouched;
 533         }
 534
 535         /**
 536          * Get the page_latest field
 537          * @return integer rev_id of current revision
 538          */
 539         public function getLatest() {
 540                 if ( !$this->mDataLoaded ) {
 541                         $this->loadPageData();
 542                 }
 543                 return (int)$this->mLatest;
 544         }
 545
 546         /**
 547          * Get the Revision object of the oldest revision
 548          * @return Revision|null
 549          */
 550         public function getOldestRevision() {
 551                 wfProfileIn( __METHOD__ );
 552
 553                 // Try using the slave database first, then try the master
 554                 $continue = 2;
 555                 $db = wfGetDB( DB_SLAVE );
 556                 $revSelectFields = Revision::selectFields();
 557
 558                 $row = null;
 559                 while ( $continue ) {
 560                         $row = $db->selectRow(
 561                                 array( 'page', 'revision' ),
 562                                 $revSelectFields,
 563                                 array(
 564                                         'page_namespace' => $this->mTitle->getNamespace(),
 565                                         'page_title' => $this->mTitle->getDBkey(),
 566                                         'rev_page = page_id'
 567                                 ),
 568                                 __METHOD__,
 569                                 array(
 570                                         'ORDER BY' => 'rev_timestamp ASC'
 571                                 )
 572                         );
 573
 574                         if ( $row ) {
 575                                 $continue = 0;
 576                         } else {
 577                                 $db = wfGetDB( DB_MASTER );
 578                                 $continue--;
 579                         }
 580                 }
 581
 582                 wfProfileOut( __METHOD__ );
 583                 return $row ? Revision::newFromRow( $row ) : null;
 584         }
 585
 586         /**
 587          * Loads everything except the text
 588          * This isn't necessary for all uses, so it's only done if needed.
 589          */
 590         protected function loadLastEdit() {
 591                 if ( $this->mLastRevision !== null ) {
 592                         return; // already loaded
 593                 }
 594
 595                 $latest = $this->getLatest();
 596                 if ( !$latest ) {
 597                         return; // page doesn't exist or is missing page_latest info
 598                 }
 599
 600                 // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always includes the
 601                 // latest changes committed. This is true even within REPEATABLE-READ transactions, where
 602                 // S1 normally only sees changes committed before the first S1 SELECT. Thus we need S1 to
 603                 // also gets the revision row FOR UPDATE; otherwise, it may not find it since a page row
 604                 // UPDATE and revision row INSERT by S2 may have happened after the first S1 SELECT.
 605                 // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 606                 $flags = ( $this->mDataLoadedFrom == self::READ_LOCKING ) ? Revision::READ_LOCKING : 0;
 607                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 608                 if ( $revision ) { // sanity
 609                         $this->setLastEdit( $revision );
 610                 }
 611         }
 612
 613         /**
 614          * Set the latest revision
 615          */
 616         protected function setLastEdit( Revision $revision ) {
 617                 $this->mLastRevision = $revision;
 618                 $this->mTimestamp = $revision->getTimestamp();
 619         }
 620
 621         /**
 622          * Get the latest revision
 623          * @return Revision|null
 624          */
 625         public function getRevision() {
 626                 $this->loadLastEdit();
 627                 if ( $this->mLastRevision ) {
 628                         return $this->mLastRevision;
 629                 }
 630                 return null;
 631         }
 632
 633         /**
 634          * Get the content of the current revision. No side-effects...
 635          *
 636          * @param $audience Integer: one of:
 637          *      Revision::FOR_PUBLIC       to be displayed to all users
 638          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 639          *      Revision::RAW              get the text regardless of permissions
 640          * @param $user User object to check for, only if FOR_THIS_USER is passed
 641          *              to the $audience parameter
 642          * @return Content|null The content of the current revision
 643          *
 644          * @since 1.21
 645          */
 646         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 647                 $this->loadLastEdit();
 648                 if ( $this->mLastRevision ) {
 649                         return $this->mLastRevision->getContent( $audience, $user );
 650                 }
 651                 return null;
 652         }
 653
 654         /**
 655          * Get the text of the current revision. No side-effects...
 656          *
 657          * @param $audience Integer: one of:
 658          *      Revision::FOR_PUBLIC       to be displayed to all users
 659          *      Revision::FOR_THIS_USER    to be displayed to the given user
 660          *      Revision::RAW              get the text regardless of permissions
 661          * @param $user User object to check for, only if FOR_THIS_USER is passed
 662          *              to the $audience parameter
 663          * @return String|false The text of the current revision
 664          * @deprecated as of 1.21, getContent() should be used instead.
 665          */
 666         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) { // @todo deprecated, replace usage!
 667                 ContentHandler::deprecated( __METHOD__, '1.21' );
 668
 669                 $this->loadLastEdit();
 670                 if ( $this->mLastRevision ) {
 671                         return $this->mLastRevision->getText( $audience, $user );
 672                 }
 673                 return false;
 674         }
 675
 676         /**
 677          * Get the text of the current revision. No side-effects...
 678          *
 679          * @return String|bool The text of the current revision. False on failure
 680          * @deprecated as of 1.21, getContent() should be used instead.
 681          */
 682         public function getRawText() {
 683                 ContentHandler::deprecated( __METHOD__, '1.21' );
 684
 685                 return $this->getText( Revision::RAW );
 686         }
 687
 688         /**
 689          * @return string MW timestamp of last article revision
 690          */
 691         public function getTimestamp() {
 692                 // Check if the field has been filled by WikiPage::setTimestamp()
 693                 if ( !$this->mTimestamp ) {
 694                         $this->loadLastEdit();
 695                 }
 696
 697                 return wfTimestamp( TS_MW, $this->mTimestamp );
 698         }
 699
 700         /**
 701          * Set the page timestamp (use only to avoid DB queries)
 702          * @param string $ts MW timestamp of last article revision
 703          * @return void
 704          */
 705         public function setTimestamp( $ts ) {
 706                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 707         }
 708
 709         /**
 710          * @param $audience Integer: one of:
 711          *      Revision::FOR_PUBLIC       to be displayed to all users
 712          *      Revision::FOR_THIS_USER    to be displayed to the given user
 713          *      Revision::RAW              get the text regardless of permissions
 714          * @param $user User object to check for, only if FOR_THIS_USER is passed
 715          *              to the $audience parameter
 716          * @return int user ID for the user that made the last article revision
 717          */
 718         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 719                 $this->loadLastEdit();
 720                 if ( $this->mLastRevision ) {
 721                         return $this->mLastRevision->getUser( $audience, $user );
 722                 } else {
 723                         return -1;
 724                 }
 725         }
 726
 727         /**
 728          * Get the User object of the user who created the page
 729          * @param $audience Integer: one of:
 730          *      Revision::FOR_PUBLIC       to be displayed to all users
 731          *      Revision::FOR_THIS_USER    to be displayed to the given user
 732          *      Revision::RAW              get the text regardless of permissions
 733          * @param $user User object to check for, only if FOR_THIS_USER is passed
 734          *              to the $audience parameter
 735          * @return User|null
 736          */
 737         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 738                 $revision = $this->getOldestRevision();
 739                 if ( $revision ) {
 740                         $userName = $revision->getUserText( $audience, $user );
 741                         return User::newFromName( $userName, false );
 742                 } else {
 743                         return null;
 744                 }
 745         }
 746
 747         /**
 748          * @param $audience Integer: one of:
 749          *      Revision::FOR_PUBLIC       to be displayed to all users
 750          *      Revision::FOR_THIS_USER    to be displayed to the given user
 751          *      Revision::RAW              get the text regardless of permissions
 752          * @param $user User object to check for, only if FOR_THIS_USER is passed
 753          *              to the $audience parameter
 754          * @return string username of the user that made the last article revision
 755          */
 756         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 757                 $this->loadLastEdit();
 758                 if ( $this->mLastRevision ) {
 759                         return $this->mLastRevision->getUserText( $audience, $user );
 760                 } else {
 761                         return '';
 762                 }
 763         }
 764
 765         /**
 766          * @param $audience Integer: one of:
 767          *      Revision::FOR_PUBLIC       to be displayed to all users
 768          *      Revision::FOR_THIS_USER    to be displayed to the given user
 769          *      Revision::RAW              get the text regardless of permissions
 770          * @param $user User object to check for, only if FOR_THIS_USER is passed
 771          *              to the $audience parameter
 772          * @return string Comment stored for the last article revision
 773          */
 774         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 775                 $this->loadLastEdit();
 776                 if ( $this->mLastRevision ) {
 777                         return $this->mLastRevision->getComment( $audience, $user );
 778                 } else {
 779                         return '';
 780                 }
 781         }
 782
 783         /**
 784          * Returns true if last revision was marked as "minor edit"
 785          *
 786          * @return boolean Minor edit indicator for the last article revision.
 787          */
 788         public function getMinorEdit() {
 789                 $this->loadLastEdit();
 790                 if ( $this->mLastRevision ) {
 791                         return $this->mLastRevision->isMinor();
 792                 } else {
 793                         return false;
 794                 }
 795         }
 796
 797         /**
 798          * Get the cached timestamp for the last time the page changed.
 799          * This is only used to help handle slave lag by comparing to page_touched.
 800          * @return string MW timestamp
 801          */
 802         protected function getCachedLastEditTime() {
 803                 global $wgMemc;
 804                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 805                 return $wgMemc->get( $key );
 806         }
 807
 808         /**
 809          * Set the cached timestamp for the last time the page changed.
 810          * This is only used to help handle slave lag by comparing to page_touched.
 811          * @param $timestamp string
 812          * @return void
 813          */
 814         public function setCachedLastEditTime( $timestamp ) {
 815                 global $wgMemc;
 816                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 817                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60 * 15 );
 818         }
 819
 820         /**
 821          * Determine whether a page would be suitable for being counted as an
 822          * article in the site_stats table based on the title & its content
 823          *
 824          * @param $editInfo Object|bool (false): object returned by prepareTextForEdit(),
 825          *        if false, the current database state will be used
 826          * @return Boolean
 827          */
 828         public function isCountable( $editInfo = false ) {
 829                 global $wgArticleCountMethod;
 830
 831                 if ( !$this->mTitle->isContentPage() ) {
 832                         return false;
 833                 }
 834
 835                 if ( $editInfo ) {
 836                         $content = $editInfo->pstContent;
 837                 } else {
 838                         $content = $this->getContent();
 839                 }
 840
 841                 if ( !$content || $content->isRedirect() ) {
 842                         return false;
 843                 }
 844
 845                 $hasLinks = null;
 846
 847                 if ( $wgArticleCountMethod === 'link' ) {
 848                         // nasty special case to avoid re-parsing to detect links
 849
 850                         if ( $editInfo ) {
 851                                 // ParserOutput::getLinks() is a 2D array of page links, so
 852                                 // to be really correct we would need to recurse in the array
 853                                 // but the main array should only have items in it if there are
 854                                 // links.
 855                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 856                         } else {
 857                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 858                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 859                         }
 860                 }
 861
 862                 return $content->isCountable( $hasLinks );
 863         }
 864
 865         /**
 866          * If this page is a redirect, get its target
 867          *
 868          * The target will be fetched from the redirect table if possible.
 869          * If this page doesn't have an entry there, call insertRedirect()
 870          * @return Title|mixed object, or null if this page is not a redirect
 871          */
 872         public function getRedirectTarget() {
 873                 if ( !$this->mTitle->isRedirect() ) {
 874                         return null;
 875                 }
 876
 877                 if ( $this->mRedirectTarget !== null ) {
 878                         return $this->mRedirectTarget;
 879                 }
 880
 881                 // Query the redirect table
 882                 $dbr = wfGetDB( DB_SLAVE );
 883                 $row = $dbr->selectRow( 'redirect',
 884                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 885                         array( 'rd_from' => $this->getId() ),
 886                         __METHOD__
 887                 );
 888
 889                 // rd_fragment and rd_interwiki were added later, populate them if empty
 890                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 891                         return $this->mRedirectTarget = Title::makeTitle(
 892                                 $row->rd_namespace, $row->rd_title,
 893                                 $row->rd_fragment, $row->rd_interwiki );
 894                 }
 895
 896                 // This page doesn't have an entry in the redirect table
 897                 return $this->mRedirectTarget = $this->insertRedirect();
 898         }
 899
 900         /**
 901          * Insert an entry for this page into the redirect table.
 902          *
 903          * Don't call this function directly unless you know what you're doing.
 904          * @return Title object or null if not a redirect
 905          */
 906         public function insertRedirect() {
 907                 // recurse through to only get the final target
 908                 $content = $this->getContent();
 909                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 910                 if ( !$retval ) {
 911                         return null;
 912                 }
 913                 $this->insertRedirectEntry( $retval );
 914                 return $retval;
 915         }
 916
 917         /**
 918          * Insert or update the redirect table entry for this page to indicate
 919          * it redirects to $rt .
 920          * @param $rt Title redirect target
 921          */
 922         public function insertRedirectEntry( $rt ) {
 923                 $dbw = wfGetDB( DB_MASTER );
 924                 $dbw->replace( 'redirect', array( 'rd_from' ),
 925                         array(
 926                                 'rd_from' => $this->getId(),
 927                                 'rd_namespace' => $rt->getNamespace(),
 928                                 'rd_title' => $rt->getDBkey(),
 929                                 'rd_fragment' => $rt->getFragment(),
 930                                 'rd_interwiki' => $rt->getInterwiki(),
 931                         ),
 932                         __METHOD__
 933                 );
 934         }
 935
 936         /**
 937          * Get the Title object or URL this page redirects to
 938          *
 939          * @return mixed false, Title of in-wiki target, or string with URL
 940          */
 941         public function followRedirect() {
 942                 return $this->getRedirectURL( $this->getRedirectTarget() );
 943         }
 944
 945         /**
 946          * Get the Title object or URL to use for a redirect. We use Title
 947          * objects for same-wiki, non-special redirects and URLs for everything
 948          * else.
 949          * @param $rt Title Redirect target
 950          * @return mixed false, Title object of local target, or string with URL
 951          */
 952         public function getRedirectURL( $rt ) {
 953                 if ( !$rt ) {
 954                         return false;
 955                 }
 956
 957                 if ( $rt->isExternal() ) {
 958                         if ( $rt->isLocal() ) {
 959                                 // Offsite wikis need an HTTP redirect.
 960                                 //
 961                                 // This can be hard to reverse and may produce loops,
 962                                 // so they may be disabled in the site configuration.
 963                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 964                                 return $rt->getFullURL( array( 'rdfrom' => $source ) );
 965                         } else {
 966                                 // External pages pages without "local" bit set are not valid
 967                                 // redirect targets
 968                                 return false;
 969                         }
 970                 }
 971
 972                 if ( $rt->isSpecialPage() ) {
 973                         // Gotta handle redirects to special pages differently:
 974                         // Fill the HTTP response "Location" header and ignore
 975                         // the rest of the page we're on.
 976                         //
 977                         // Some pages are not valid targets
 978                         if ( $rt->isValidRedirectTarget() ) {
 979                                 return $rt->getFullURL();
 980                         } else {
 981                                 return false;
 982                         }
 983                 }
 984
 985                 return $rt;
 986         }
 987
 988         /**
 989          * Get a list of users who have edited this article, not including the user who made
 990          * the most recent revision, which you can get from $article->getUser() if you want it
 991          * @return UserArrayFromResult
 992          */
 993         public function getContributors() {
 994                 // @todo FIXME: This is expensive; cache this info somewhere.
 995
 996                 $dbr = wfGetDB( DB_SLAVE );
 997
 998                 if ( $dbr->implicitGroupby() ) {
 999                         $realNameField = 'user_real_name';
1000                 } else {
1001                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1002                 }
1003
1004                 $tables = array( 'revision', 'user' );
1005
1006                 $fields = array(
1007                         'user_id' => 'rev_user',
1008                         'user_name' => 'rev_user_text',
1009                         $realNameField,
1010                         'timestamp' => 'MAX(rev_timestamp)',
1011                 );
1012
1013                 $conds = array( 'rev_page' => $this->getId() );
1014
1015                 // The user who made the top revision gets credited as "this page was last edited by
1016                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1017                 $user = $this->getUser();
1018                 if ( $user ) {
1019                         $conds[] = "rev_user != $user";
1020                 } else {
1021                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1022                 }
1023
1024                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
1025
1026                 $jconds = array(
1027                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
1028                 );
1029
1030                 $options = array(
1031                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
1032                         'ORDER BY' => 'timestamp DESC',
1033                 );
1034
1035                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1036                 return new UserArrayFromResult( $res );
1037         }
1038
1039         /**
1040          * Get the last N authors
1041          * @param int $num Number of revisions to get
1042          * @param int|string $revLatest the latest rev_id, selected from the master (optional)
1043          * @return array Array of authors, duplicates not removed
1044          */
1045         public function getLastNAuthors( $num, $revLatest = 0 ) {
1046                 wfProfileIn( __METHOD__ );
1047                 // First try the slave
1048                 // If that doesn't have the latest revision, try the master
1049                 $continue = 2;
1050                 $db = wfGetDB( DB_SLAVE );
1051
1052                 do {
1053                         $res = $db->select( array( 'page', 'revision' ),
1054                                 array( 'rev_id', 'rev_user_text' ),
1055                                 array(
1056                                         'page_namespace' => $this->mTitle->getNamespace(),
1057                                         'page_title' => $this->mTitle->getDBkey(),
1058                                         'rev_page = page_id'
1059                                 ), __METHOD__,
1060                                 array(
1061                                         'ORDER BY' => 'rev_timestamp DESC',
1062                                         'LIMIT' => $num
1063                                 )
1064                         );
1065
1066                         if ( !$res ) {
1067                                 wfProfileOut( __METHOD__ );
1068                                 return array();
1069                         }
1070
1071                         $row = $db->fetchObject( $res );
1072
1073                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1074                                 $db = wfGetDB( DB_MASTER );
1075                                 $continue--;
1076                         } else {
1077                                 $continue = 0;
1078                         }
1079                 } while ( $continue );
1080
1081                 $authors = array( $row->rev_user_text );
1082
1083                 foreach ( $res as $row ) {
1084                         $authors[] = $row->rev_user_text;
1085                 }
1086
1087                 wfProfileOut( __METHOD__ );
1088                 return $authors;
1089         }
1090
1091         /**
1092          * Should the parser cache be used?
1093          *
1094          * @param $parserOptions ParserOptions to check
1095          * @param $oldid int
1096          * @return boolean
1097          */
1098         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1099                 global $wgEnableParserCache;
1100
1101                 return $wgEnableParserCache
1102                         && $parserOptions->getStubThreshold() == 0
1103                         && $this->exists()
1104                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1105                         && $this->getContentHandler()->isParserCacheSupported();
1106         }
1107
1108         /**
1109          * Get a ParserOutput for the given ParserOptions and revision ID.
1110          * The parser cache will be used if possible.
1111          *
1112          * @since 1.19
1113          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1114          * @param null|int $oldid Revision ID to get the text from, passing null or 0 will
1115          *               get the current revision (default value)
1116          *
1117          * @return ParserOutput or false if the revision was not found
1118          */
1119         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1120                 wfProfileIn( __METHOD__ );
1121
1122                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1123                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1124                 if ( $parserOptions->getStubThreshold() ) {
1125                         wfIncrStats( 'pcache_miss_stub' );
1126                 }
1127
1128                 if ( $useParserCache ) {
1129                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1130                         if ( $parserOutput !== false ) {
1131                                 wfProfileOut( __METHOD__ );
1132                                 return $parserOutput;
1133                         }
1134                 }
1135
1136                 if ( $oldid === null || $oldid === 0 ) {
1137                         $oldid = $this->getLatest();
1138                 }
1139
1140                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1141                 $pool->execute();
1142
1143                 wfProfileOut( __METHOD__ );
1144
1145                 return $pool->getParserOutput();
1146         }
1147
1148         /**
1149          * Do standard deferred updates after page view
1150          * @param User $user The relevant user
1151          * @param int $oldid The revision id being viewed. If not given or 0, latest revision is assumed.
1152          */
1153         public function doViewUpdates( User $user, $oldid = 0 ) {
1154                 global $wgDisableCounters;
1155                 if ( wfReadOnly() ) {
1156                         return;
1157                 }
1158
1159                 // Don't update page view counters on views from bot users (bug 14044)
1160                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->exists() ) {
1161                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1162                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1163                 }
1164
1165                 // Update newtalk / watchlist notification status
1166                 $user->clearNotification( $this->mTitle, $oldid );
1167         }
1168
1169         /**
1170          * Perform the actions of a page purging
1171          * @return bool
1172          */
1173         public function doPurge() {
1174                 global $wgUseSquid;
1175
1176                 if ( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1177                         return false;
1178                 }
1179
1180                 // Invalidate the cache
1181                 $this->mTitle->invalidateCache();
1182
1183                 if ( $wgUseSquid ) {
1184                         // Commit the transaction before the purge is sent
1185                         $dbw = wfGetDB( DB_MASTER );
1186                         $dbw->commit( __METHOD__ );
1187
1188                         // Send purge
1189                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1190                         $update->doUpdate();
1191                 }
1192
1193                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1194                         // @todo move this logic to MessageCache
1195
1196                         if ( $this->exists() ) {
1197                                 // NOTE: use transclusion text for messages.
1198                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1199
1200                                 $content = $this->getContent();
1201                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1202
1203                                 if ( $text === null ) {
1204                                         $text = false;
1205                                 }
1206                         } else {
1207                                 $text = false;
1208                         }
1209
1210                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1211                 }
1212                 return true;
1213         }
1214
1215         /**
1216          * Insert a new empty page record for this article.
1217          * This *must* be followed up by creating a revision
1218          * and running $this->updateRevisionOn( ... );
1219          * or else the record will be left in a funky state.
1220          * Best if all done inside a transaction.
1221          *
1222          * @param $dbw DatabaseBase
1223          * @return int The newly created page_id key, or false if the title already existed
1224          */
1225         public function insertOn( $dbw ) {
1226                 wfProfileIn( __METHOD__ );
1227
1228                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1229                 $dbw->insert( 'page', array(
1230                         'page_id'           => $page_id,
1231                         'page_namespace'    => $this->mTitle->getNamespace(),
1232                         'page_title'        => $this->mTitle->getDBkey(),
1233                         'page_counter'      => 0,
1234                         'page_restrictions' => '',
1235                         'page_is_redirect'  => 0, // Will set this shortly...
1236                         'page_is_new'       => 1,
1237                         'page_random'       => wfRandom(),
1238                         'page_touched'      => $dbw->timestamp(),
1239                         'page_latest'       => 0, // Fill this in shortly...
1240                         'page_len'          => 0, // Fill this in shortly...
1241                 ), __METHOD__, 'IGNORE' );
1242
1243                 $affected = $dbw->affectedRows();
1244
1245                 if ( $affected ) {
1246                         $newid = $dbw->insertId();
1247                         $this->mId = $newid;
1248                         $this->mTitle->resetArticleID( $newid );
1249                 }
1250                 wfProfileOut( __METHOD__ );
1251
1252                 return $affected ? $newid : false;
1253         }
1254
1255         /**
1256          * Update the page record to point to a newly saved revision.
1257          *
1258          * @param $dbw DatabaseBase: object
1259          * @param $revision Revision: For ID number, and text used to set
1260          *                  length and redirect status fields
1261          * @param $lastRevision Integer: if given, will not overwrite the page field
1262          *                      when different from the currently set value.
1263          *                      Giving 0 indicates the new page flag should be set
1264          *                      on.
1265          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1266          *                           removing rows in redirect table.
1267          * @return bool true on success, false on failure
1268          * @private
1269          */
1270         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1271                 global $wgContentHandlerUseDB;
1272
1273                 wfProfileIn( __METHOD__ );
1274
1275                 $content = $revision->getContent();
1276                 $len = $content ? $content->getSize() : 0;
1277                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1278
1279                 $conditions = array( 'page_id' => $this->getId() );
1280
1281                 if ( !is_null( $lastRevision ) ) {
1282                         // An extra check against threads stepping on each other
1283                         $conditions['page_latest'] = $lastRevision;
1284                 }
1285
1286                 $now = wfTimestampNow();
1287                 $row = array( /* SET */
1288                         'page_latest'      => $revision->getId(),
1289                         'page_touched'     => $dbw->timestamp( $now ),
1290                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1291                         'page_is_redirect' => $rt !== null ? 1 : 0,
1292                         'page_len'         => $len,
1293                 );
1294
1295                 if ( $wgContentHandlerUseDB ) {
1296                         $row['page_content_model'] = $revision->getContentModel();
1297                 }
1298
1299                 $dbw->update( 'page',
1300                         $row,
1301                         $conditions,
1302                         __METHOD__ );
1303
1304                 $result = $dbw->affectedRows() > 0;
1305                 if ( $result ) {
1306                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1307                         $this->setLastEdit( $revision );
1308                         $this->setCachedLastEditTime( $now );
1309                         $this->mLatest = $revision->getId();
1310                         $this->mIsRedirect = (bool)$rt;
1311                         // Update the LinkCache.
1312                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect,
1313                                                                                                         $this->mLatest, $revision->getContentModel() );
1314                 }
1315
1316                 wfProfileOut( __METHOD__ );
1317                 return $result;
1318         }
1319
1320         /**
1321          * Add row to the redirect table if this is a redirect, remove otherwise.
1322          *
1323          * @param $dbw DatabaseBase
1324          * @param $redirectTitle Title object pointing to the redirect target,
1325          *                       or NULL if this is not a redirect
1326          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1327          *                           removing rows in redirect table.
1328          * @return bool true on success, false on failure
1329          * @private
1330          */
1331         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1332                 // Always update redirects (target link might have changed)
1333                 // Update/Insert if we don't know if the last revision was a redirect or not
1334                 // Delete if changing from redirect to non-redirect
1335                 $isRedirect = !is_null( $redirectTitle );
1336
1337                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1338                         return true;
1339                 }
1340
1341                 wfProfileIn( __METHOD__ );
1342                 if ( $isRedirect ) {
1343                         $this->insertRedirectEntry( $redirectTitle );
1344                 } else {
1345                         // This is not a redirect, remove row from redirect table
1346                         $where = array( 'rd_from' => $this->getId() );
1347                         $dbw->delete( 'redirect', $where, __METHOD__ );
1348                 }
1349
1350                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1351                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1352                 }
1353                 wfProfileOut( __METHOD__ );
1354
1355                 return ( $dbw->affectedRows() != 0 );
1356         }
1357
1358         /**
1359          * If the given revision is newer than the currently set page_latest,
1360          * update the page record. Otherwise, do nothing.
1361          *
1362          * @param $dbw DatabaseBase object
1363          * @param $revision Revision object
1364          * @return mixed
1365          */
1366         public function updateIfNewerOn( $dbw, $revision ) {
1367                 wfProfileIn( __METHOD__ );
1368
1369                 $row = $dbw->selectRow(
1370                         array( 'revision', 'page' ),
1371                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1372                         array(
1373                                 'page_id' => $this->getId(),
1374                                 'page_latest=rev_id' ),
1375                         __METHOD__ );
1376
1377                 if ( $row ) {
1378                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1379                                 wfProfileOut( __METHOD__ );
1380                                 return false;
1381                         }
1382                         $prev = $row->rev_id;
1383                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1384                 } else {
1385                         // No or missing previous revision; mark the page as new
1386                         $prev = 0;
1387                         $lastRevIsRedirect = null;
1388                 }
1389
1390                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1391
1392                 wfProfileOut( __METHOD__ );
1393                 return $ret;
1394         }
1395
1396         /**
1397          * Get the content that needs to be saved in order to undo all revisions
1398          * between $undo and $undoafter. Revisions must belong to the same page,
1399          * must exist and must not be deleted
1400          * @param $undo Revision
1401          * @param $undoafter Revision Must be an earlier revision than $undo
1402          * @return mixed string on success, false on failure
1403          * @since 1.21
1404          * Before we had the Content object, this was done in getUndoText
1405          */
1406         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1407                 $handler = $undo->getContentHandler();
1408                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1409         }
1410
1411         /**
1412          * Get the text that needs to be saved in order to undo all revisions
1413          * between $undo and $undoafter. Revisions must belong to the same page,
1414          * must exist and must not be deleted
1415          * @param $undo Revision
1416          * @param $undoafter Revision Must be an earlier revision than $undo
1417          * @return mixed string on success, false on failure
1418          * @deprecated since 1.21: use ContentHandler::getUndoContent() instead.
1419          */
1420         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1421                 ContentHandler::deprecated( __METHOD__, '1.21' );
1422
1423                 $this->loadLastEdit();
1424
1425                 if ( $this->mLastRevision ) {
1426                         if ( is_null( $undoafter ) ) {
1427                                 $undoafter = $undo->getPrevious();
1428                         }
1429
1430                         $handler = $this->getContentHandler();
1431                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1432
1433                         if ( !$undone ) {
1434                                 return false;
1435                         } else {
1436                                 return ContentHandler::getContentText( $undone );
1437                         }
1438                 }
1439
1440                 return false;
1441         }
1442
1443         /**
1444          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1445          * @param string $text new text of the section
1446          * @param string $sectionTitle new section's subject, only if $section is 'new'
1447          * @param string $edittime revision timestamp or null to use the current revision
1448          * @throws MWException
1449          * @return String new complete article text, or null if error
1450          *
1451          * @deprecated since 1.21, use replaceSectionContent() instead
1452          */
1453         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1454                 ContentHandler::deprecated( __METHOD__, '1.21' );
1455
1456                 if ( strval( $section ) == '' ) { //NOTE: keep condition in sync with condition in replaceSectionContent!
1457                         // Whole-page edit; let the whole text through
1458                         return $text;
1459                 }
1460
1461                 if ( !$this->supportsSections() ) {
1462                         throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1463                 }
1464
1465                 // could even make section title, but that's not required.
1466                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() );
1467
1468                 $newContent = $this->replaceSectionContent( $section, $sectionContent, $sectionTitle, $edittime );
1469
1470                 return ContentHandler::getContentText( $newContent );
1471         }
1472
1473         /**
1474          * Returns true if this page's content model supports sections.
1475          *
1476          * @return boolean whether sections are supported.
1477          *
1478          * @todo The skin should check this and not offer section functionality if sections are not supported.
1479          * @todo The EditPage should check this and not offer section functionality if sections are not supported.
1480          */
1481         public function supportsSections() {
1482                 return $this->getContentHandler()->supportsSections();
1483         }
1484
1485         /**
1486          * @param $section null|bool|int or a section number (0, 1, 2, T1, T2...)
1487          * @param $sectionContent Content: new content of the section
1488          * @param string $sectionTitle new section's subject, only if $section is 'new'
1489          * @param string $edittime revision timestamp or null to use the current revision
1490          *
1491          * @throws MWException
1492          * @return Content new complete article content, or null if error
1493          *
1494          * @since 1.21
1495          */
1496         public function replaceSectionContent( $section, Content $sectionContent, $sectionTitle = '', $edittime = null ) {
1497                 wfProfileIn( __METHOD__ );
1498
1499                 if ( strval( $section ) == '' ) {
1500                         // Whole-page edit; let the whole text through
1501                         $newContent = $sectionContent;
1502                 } else {
1503                         if ( !$this->supportsSections() ) {
1504                                 wfProfileOut( __METHOD__ );
1505                                 throw new MWException( "sections not supported for content model " . $this->getContentHandler()->getModelID() );
1506                         }
1507
1508                         // Bug 30711: always use current version when adding a new section
1509                         if ( is_null( $edittime ) || $section == 'new' ) {
1510                                 $oldContent = $this->getContent();
1511                         } else {
1512                                 $dbw = wfGetDB( DB_MASTER );
1513                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1514
1515                                 if ( !$rev ) {
1516                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1517                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1518                                         wfProfileOut( __METHOD__ );
1519                                         return null;
1520                                 }
1521
1522                                 $oldContent = $rev->getContent();
1523                         }
1524
1525                         if ( ! $oldContent ) {
1526                                 wfDebug( __METHOD__ . ": no page text\n" );
1527                                 wfProfileOut( __METHOD__ );
1528                                 return null;
1529                         }
1530
1531                         // FIXME: $oldContent might be null?
1532                         $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1533                 }
1534
1535                 wfProfileOut( __METHOD__ );
1536                 return $newContent;
1537         }
1538
1539         /**
1540          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1541          * @param $flags Int
1542          * @return Int updated $flags
1543          */
1544         function checkFlags( $flags ) {
1545                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1546                         if ( $this->exists() ) {
1547                                 $flags |= EDIT_UPDATE;
1548                         } else {
1549                                 $flags |= EDIT_NEW;
1550                         }
1551                 }
1552
1553                 return $flags;
1554         }
1555
1556         /**
1557          * Change an existing article or create a new article. Updates RC and all necessary caches,
1558          * optionally via the deferred update array.
1559          *
1560          * @param string $text new text
1561          * @param string $summary edit summary
1562          * @param $flags Integer bitfield:
1563          *      EDIT_NEW
1564          *          Article is known or assumed to be non-existent, create a new one
1565          *      EDIT_UPDATE
1566          *          Article is known or assumed to be pre-existing, update it
1567          *      EDIT_MINOR
1568          *          Mark this edit minor, if the user is allowed to do so
1569          *      EDIT_SUPPRESS_RC
1570          *          Do not log the change in recentchanges
1571          *      EDIT_FORCE_BOT
1572          *          Mark the edit a "bot" edit regardless of user rights
1573          *      EDIT_DEFER_UPDATES
1574          *          Defer some of the updates until the end of index.php
1575          *      EDIT_AUTOSUMMARY
1576          *          Fill in blank summaries with generated text where possible
1577          *
1578          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1579          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1580          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1581          * edit-already-exists error will be returned. These two conditions are also possible with
1582          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1583          *
1584          * @param bool|int $baseRevId int the revision ID this edit was based off, if any
1585          * @param $user User the user doing the edit
1586          *
1587          * @throws MWException
1588          * @return Status object. Possible errors:
1589          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1590          *     edit-gone-missing:       In update mode, but the article didn't exist
1591          *     edit-conflict:           In update mode, the article changed unexpectedly
1592          *     edit-no-change:          Warning that the text was the same as before
1593          *     edit-already-exists:     In creation mode, but the article already exists
1594          *
1595          *  Extensions may define additional errors.
1596          *
1597          *  $return->value will contain an associative array with members as follows:
1598          *     new:                     Boolean indicating if the function attempted to create a new article
1599          *     revision:                The revision object for the inserted revision, or null
1600          *
1601          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1602          *
1603          * @deprecated since 1.21: use doEditContent() instead.
1604          */
1605         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1606                 ContentHandler::deprecated( __METHOD__, '1.21' );
1607
1608                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1609
1610                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1611         }
1612
1613         /**
1614          * Change an existing article or create a new article. Updates RC and all necessary caches,
1615          * optionally via the deferred update array.
1616          *
1617          * @param $content Content: new content
1618          * @param string $summary edit summary
1619          * @param $flags Integer bitfield:
1620          *      EDIT_NEW
1621          *          Article is known or assumed to be non-existent, create a new one
1622          *      EDIT_UPDATE
1623          *          Article is known or assumed to be pre-existing, update it
1624          *      EDIT_MINOR
1625          *          Mark this edit minor, if the user is allowed to do so
1626          *      EDIT_SUPPRESS_RC
1627          *          Do not log the change in recentchanges
1628          *      EDIT_FORCE_BOT
1629          *          Mark the edit a "bot" edit regardless of user rights
1630          *      EDIT_DEFER_UPDATES
1631          *          Defer some of the updates until the end of index.php
1632          *      EDIT_AUTOSUMMARY
1633          *          Fill in blank summaries with generated text where possible
1634          *
1635          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1636          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1637          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1638          * edit-already-exists error will be returned. These two conditions are also possible with
1639          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1640          *
1641          * @param bool|int $baseRevId the revision ID this edit was based off, if any
1642          * @param $user User the user doing the edit
1643          * @param $serialisation_format String: format for storing the content in the database
1644          *
1645          * @throws MWException
1646          * @return Status object. Possible errors:
1647          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1648          *     edit-gone-missing:       In update mode, but the article didn't exist
1649          *     edit-conflict:           In update mode, the article changed unexpectedly
1650          *     edit-no-change:          Warning that the text was the same as before
1651          *     edit-already-exists:     In creation mode, but the article already exists
1652          *
1653          *  Extensions may define additional errors.
1654          *
1655          *  $return->value will contain an associative array with members as follows:
1656          *     new:                     Boolean indicating if the function attempted to create a new article
1657          *     revision:                The revision object for the inserted revision, or null
1658          *
1659          * @since 1.21
1660          */
1661         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1662                                                                    User $user = null, $serialisation_format = null ) {
1663                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1664
1665                 // Low-level sanity check
1666                 if ( $this->mTitle->getText() === '' ) {
1667                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1668                 }
1669
1670                 wfProfileIn( __METHOD__ );
1671
1672                 if ( !$content->getContentHandler()->canBeUsedOn( $this->getTitle() ) ) {
1673                         wfProfileOut( __METHOD__ );
1674                         return Status::newFatal( 'content-not-allowed-here',
1675                                 ContentHandler::getLocalizedName( $content->getModel() ),
1676                                 $this->getTitle()->getPrefixedText() );
1677                 }
1678
1679                 $user = is_null( $user ) ? $wgUser : $user;
1680                 $status = Status::newGood( array() );
1681
1682                 // Load the data from the master database if needed.
1683                 // The caller may already loaded it from the master or even loaded it using
1684                 // SELECT FOR UPDATE, so do not override that using clear().
1685                 $this->loadPageData( 'fromdbmaster' );
1686
1687                 $flags = $this->checkFlags( $flags );
1688
1689                 // handle hook
1690                 $hook_args = array( &$this, &$user, &$content, &$summary,
1691                                                         $flags & EDIT_MINOR, null, null, &$flags, &$status );
1692
1693                 if ( !wfRunHooks( 'PageContentSave', $hook_args )
1694                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args ) ) {
1695
1696                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1697
1698                         if ( $status->isOK() ) {
1699                                 $status->fatal( 'edit-hook-aborted' );
1700                         }
1701
1702                         wfProfileOut( __METHOD__ );
1703                         return $status;
1704                 }
1705
1706                 // Silently ignore EDIT_MINOR if not allowed
1707                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1708                 $bot = $flags & EDIT_FORCE_BOT;
1709
1710                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1711
1712                 $oldsize = $old_content ? $old_content->getSize() : 0;
1713                 $oldid = $this->getLatest();
1714                 $oldIsRedirect = $this->isRedirect();
1715                 $oldcountable = $this->isCountable();
1716
1717                 $handler = $content->getContentHandler();
1718
1719                 // Provide autosummaries if one is not provided and autosummaries are enabled.
1720                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1721                         if ( !$old_content ) {
1722                                 $old_content = null;
1723                         }
1724                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1725                 }
1726
1727                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1728                 $serialized = $editInfo->pst;
1729
1730                 /**
1731                  * @var Content $content
1732                  */
1733                 $content = $editInfo->pstContent;
1734                 $newsize = $content->getSize();
1735
1736                 $dbw = wfGetDB( DB_MASTER );
1737                 $now = wfTimestampNow();
1738                 $this->mTimestamp = $now;
1739
1740                 if ( $flags & EDIT_UPDATE ) {
1741                         // Update article, but only if changed.
1742                         $status->value['new'] = false;
1743
1744                         if ( !$oldid ) {
1745                                 // Article gone missing
1746                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1747                                 $status->fatal( 'edit-gone-missing' );
1748
1749                                 wfProfileOut( __METHOD__ );
1750                                 return $status;
1751                         } elseif ( !$old_content ) {
1752                                 // Sanity check for bug 37225
1753                                 wfProfileOut( __METHOD__ );
1754                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1755                         }
1756
1757                         $revision = new Revision( array(
1758                                 'page'       => $this->getId(),
1759                                 'title'      => $this->getTitle(), // for determining the default content model
1760                                 'comment'    => $summary,
1761                                 'minor_edit' => $isminor,
1762                                 'text'       => $serialized,
1763                                 'len'        => $newsize,
1764                                 'parent_id'  => $oldid,
1765                                 'user'       => $user->getId(),
1766                                 'user_text'  => $user->getName(),
1767                                 'timestamp'  => $now,
1768                                 'content_model' => $content->getModel(),
1769                                 'content_format' => $serialisation_format,
1770                         ) ); // XXX: pass content object?!
1771
1772                         $changed = !$content->equals( $old_content );
1773
1774                         if ( $changed ) {
1775                                 if ( !$content->isValid() ) {
1776                                         wfProfileOut( __METHOD__ );
1777                                         throw new MWException( "New content failed validity check!" );
1778                                 }
1779
1780                                 $dbw->begin( __METHOD__ );
1781
1782                                 $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1783                                 $status->merge( $prepStatus );
1784
1785                                 if ( !$status->isOK() ) {
1786                                         $dbw->rollback( __METHOD__ );
1787
1788                                         wfProfileOut( __METHOD__ );
1789                                         return $status;
1790                                 }
1791
1792                                 $revisionId = $revision->insertOn( $dbw );
1793
1794                                 // Update page
1795                                 //
1796                                 // Note that we use $this->mLatest instead of fetching a value from the master DB
1797                                 // during the course of this function. This makes sure that EditPage can detect
1798                                 // edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1799                                 // before this function is called. A previous function used a separate query, this
1800                                 // creates a window where concurrent edits can cause an ignored edit conflict.
1801                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1802
1803                                 if ( !$ok ) {
1804                                         // Belated edit conflict! Run away!!
1805                                         $status->fatal( 'edit-conflict' );
1806
1807                                         $dbw->rollback( __METHOD__ );
1808
1809                                         wfProfileOut( __METHOD__ );
1810                                         return $status;
1811                                 }
1812
1813                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1814                                 // Update recentchanges
1815                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1816                                         // Mark as patrolled if the user can do so
1817                                         $patrolled = $wgUseRCPatrol && !count(
1818                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1819                                         // Add RC row to the DB
1820                                         $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1821                                                 $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1822                                                 $revisionId, $patrolled
1823                                         );
1824
1825                                         // Log auto-patrolled edits
1826                                         if ( $patrolled ) {
1827                                                 PatrolLog::record( $rc, true, $user );
1828                                         }
1829                                 }
1830                                 $user->incEditCount();
1831                                 $dbw->commit( __METHOD__ );
1832                         } else {
1833                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1834                                 // related variables correctly
1835                                 $revision->setId( $this->getLatest() );
1836                         }
1837
1838                         // Update links tables, site stats, etc.
1839                         $this->doEditUpdates(
1840                                 $revision,
1841                                 $user,
1842                                 array(
1843                                         'changed' => $changed,
1844                                         'oldcountable' => $oldcountable
1845                                 )
1846                         );
1847
1848                         if ( !$changed ) {
1849                                 $status->warning( 'edit-no-change' );
1850                                 $revision = null;
1851                                 // Update page_touched, this is usually implicit in the page update
1852                                 // Other cache updates are done in onArticleEdit()
1853                                 $this->mTitle->invalidateCache();
1854                         }
1855                 } else {
1856                         // Create new article
1857                         $status->value['new'] = true;
1858
1859                         $dbw->begin( __METHOD__ );
1860
1861                         $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1862                         $status->merge( $prepStatus );
1863
1864                         if ( !$status->isOK() ) {
1865                                 $dbw->rollback( __METHOD__ );
1866
1867                                 wfProfileOut( __METHOD__ );
1868                                 return $status;
1869                         }
1870
1871                         $status->merge( $prepStatus );
1872
1873                         // Add the page record; stake our claim on this title!
1874                         // This will return false if the article already exists
1875                         $newid = $this->insertOn( $dbw );
1876
1877                         if ( $newid === false ) {
1878                                 $dbw->rollback( __METHOD__ );
1879                                 $status->fatal( 'edit-already-exists' );
1880
1881                                 wfProfileOut( __METHOD__ );
1882                                 return $status;
1883                         }
1884
1885                         // Save the revision text...
1886                         $revision = new Revision( array(
1887                                 'page'       => $newid,
1888                                 'title'      => $this->getTitle(), // for determining the default content model
1889                                 'comment'    => $summary,
1890                                 'minor_edit' => $isminor,
1891                                 'text'       => $serialized,
1892                                 'len'        => $newsize,
1893                                 'user'       => $user->getId(),
1894                                 'user_text'  => $user->getName(),
1895                                 'timestamp'  => $now,
1896                                 'content_model' => $content->getModel(),
1897                                 'content_format' => $serialisation_format,
1898                         ) );
1899                         $revisionId = $revision->insertOn( $dbw );
1900
1901                         // Bug 37225: use accessor to get the text as Revision may trim it
1902                         $content = $revision->getContent(); // sanity; get normalized version
1903
1904                         if ( $content ) {
1905                                 $newsize = $content->getSize();
1906                         }
1907
1908                         // Update the page record with revision data
1909                         $this->updateRevisionOn( $dbw, $revision, 0 );
1910
1911                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1912
1913                         // Update recentchanges
1914                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1915                                 // Mark as patrolled if the user can do so
1916                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1917                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1918                                 // Add RC row to the DB
1919                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1920                                         '', $newsize, $revisionId, $patrolled );
1921
1922                                 // Log auto-patrolled edits
1923                                 if ( $patrolled ) {
1924                                         PatrolLog::record( $rc, true, $user );
1925                                 }
1926                         }
1927                         $user->incEditCount();
1928                         $dbw->commit( __METHOD__ );
1929
1930                         // Update links, etc.
1931                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1932
1933                         $hook_args = array( &$this, &$user, $content, $summary,
1934                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision );
1935
1936                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $hook_args );
1937                         wfRunHooks( 'PageContentInsertComplete', $hook_args );
1938                 }
1939
1940                 // Do updates right now unless deferral was requested
1941                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1942                         DeferredUpdates::doUpdates();
1943                 }
1944
1945                 // Return the new revision (or null) to the caller
1946                 $status->value['revision'] = $revision;
1947
1948                 $hook_args = array( &$this, &$user, $content, $summary,
1949                                                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId );
1950
1951                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $hook_args );
1952                 wfRunHooks( 'PageContentSaveComplete', $hook_args );
1953
1954                 // Promote user to any groups they meet the criteria for
1955                 $user->addAutopromoteOnceGroups( 'onEdit' );
1956
1957                 wfProfileOut( __METHOD__ );
1958                 return $status;
1959         }
1960
1961         /**
1962          * Get parser options suitable for rendering the primary article wikitext
1963          *
1964          * @see ContentHandler::makeParserOptions
1965          *
1966          * @param IContextSource|User|string $context One of the following:
1967          *        - IContextSource: Use the User and the Language of the provided
1968          *          context
1969          *        - User: Use the provided User object and $wgLang for the language,
1970          *          so use an IContextSource object if possible.
1971          *        - 'canonical': Canonical options (anonymous user with default
1972          *          preferences and content language).
1973          * @return ParserOptions
1974          */
1975         public function makeParserOptions( $context ) {
1976                 $options = $this->getContentHandler()->makeParserOptions( $context );
1977
1978                 if ( $this->getTitle()->isConversionTable() ) {
1979                         // @todo ConversionTable should become a separate content model, so we don't need special cases like this one.
1980                         $options->disableContentConversion();
1981                 }
1982
1983                 return $options;
1984         }
1985
1986         /**
1987          * Prepare text which is about to be saved.
1988          * Returns a stdclass with source, pst and output members
1989          *
1990          * @deprecated in 1.21: use prepareContentForEdit instead.
1991          */
1992         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
1993                 ContentHandler::deprecated( __METHOD__, '1.21' );
1994                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1995                 return $this->prepareContentForEdit( $content, $revid, $user );
1996         }
1997
1998         /**
1999          * Prepare content which is about to be saved.
2000          * Returns a stdclass with source, pst and output members
2001          *
2002          * @param Content $content
2003          * @param int|null $revid
2004          * @param User|null $user
2005          * @param string|null $serialization_format
2006          *
2007          * @return bool|object
2008          *
2009          * @since 1.21
2010          */
2011         public function prepareContentForEdit( Content $content, $revid = null, User $user = null,
2012                 $serialization_format = null
2013         ) {
2014                 global $wgContLang, $wgUser;
2015                 $user = is_null( $user ) ? $wgUser : $user;
2016                 //XXX: check $user->getId() here???
2017
2018                 if ( $this->mPreparedEdit
2019                         && $this->mPreparedEdit->newContent
2020                         && $this->mPreparedEdit->newContent->equals( $content )
2021                         && $this->mPreparedEdit->revid == $revid
2022                         && $this->mPreparedEdit->format == $serialization_format
2023                         // XXX: also check $user here?
2024                 ) {
2025                         // Already prepared
2026                         return $this->mPreparedEdit;
2027                 }
2028
2029                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2030                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
2031
2032                 $edit = (object)array();
2033                 $edit->revid = $revid;
2034
2035                 $edit->pstContent = $content ? $content->preSaveTransform( $this->mTitle, $user, $popts ) : null;
2036
2037                 $edit->format = $serialization_format;
2038                 $edit->popts = $this->makeParserOptions( 'canonical' );
2039                 $edit->output = $edit->pstContent ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts ) : null;
2040
2041                 $edit->newContent = $content;
2042                 $edit->oldContent = $this->getContent( Revision::RAW );
2043
2044                 // NOTE: B/C for hooks! don't use these fields!
2045                 $edit->newText = $edit->newContent ? ContentHandler::getContentText( $edit->newContent ) : '';
2046                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
2047                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialization_format ) : '';
2048
2049                 $this->mPreparedEdit = $edit;
2050                 return $edit;
2051         }
2052
2053         /**
2054          * Do standard deferred updates after page edit.
2055          * Update links tables, site stats, search index and message cache.
2056          * Purges pages that include this page if the text was changed here.
2057          * Every 100th edit, prune the recent changes table.
2058          *
2059          * @param $revision Revision object
2060          * @param $user User object that did the revision
2061          * @param array $options of options, following indexes are used:
2062          * - changed: boolean, whether the revision changed the content (default true)
2063          * - created: boolean, whether the revision created the page (default false)
2064          * - oldcountable: boolean or null (default null):
2065          *   - boolean: whether the page was counted as an article before that
2066          *     revision, only used in changed is true and created is false
2067          *   - null: don't change the article count
2068          */
2069         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2070                 global $wgEnableParserCache;
2071
2072                 wfProfileIn( __METHOD__ );
2073
2074                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2075                 $content = $revision->getContent();
2076
2077                 // Parse the text
2078                 // Be careful not to do pre-save transform twice: $text is usually
2079                 // already pre-save transformed once.
2080                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2081                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2082                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
2083                 } else {
2084                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2085                         $editInfo = $this->mPreparedEdit;
2086                 }
2087
2088                 // Save it to the parser cache
2089                 if ( $wgEnableParserCache ) {
2090                         $parserCache = ParserCache::singleton();
2091                         $parserCache->save( $editInfo->output, $this, $editInfo->popts );
2092                 }
2093
2094                 // Update the links tables and other secondary data
2095                 if ( $content ) {
2096                         $recursive = $options['changed']; // bug 50785
2097                         $updates = $content->getSecondaryDataUpdates(
2098                                 $this->getTitle(), null, $recursive, $editInfo->output );
2099                         DataUpdate::runUpdates( $updates );
2100                 }
2101
2102                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2103
2104                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2105                         if ( 0 == mt_rand( 0, 99 ) ) {
2106                                 // Flush old entries from the `recentchanges` table; we do this on
2107                                 // random requests so as to avoid an increase in writes for no good reason
2108                                 RecentChange::purgeExpiredChanges();
2109                         }
2110                 }
2111
2112                 if ( !$this->exists() ) {
2113                         wfProfileOut( __METHOD__ );
2114                         return;
2115                 }
2116
2117                 $id = $this->getId();
2118                 $title = $this->mTitle->getPrefixedDBkey();
2119                 $shortTitle = $this->mTitle->getDBkey();
2120
2121                 if ( !$options['changed'] ) {
2122                         $good = 0;
2123                         $total = 0;
2124                 } elseif ( $options['created'] ) {
2125                         $good = (int)$this->isCountable( $editInfo );
2126                         $total = 1;
2127                 } elseif ( $options['oldcountable'] !== null ) {
2128                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2129                         $total = 0;
2130                 } else {
2131                         $good = 0;
2132                         $total = 0;
2133                 }
2134
2135                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2136                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2137
2138                 // If this is another user's talk page, update newtalk.
2139                 // Don't do this if $options['changed'] = false (null-edits) nor if
2140                 // it's a minor edit and the user doesn't want notifications for those.
2141                 if ( $options['changed']
2142                         && $this->mTitle->getNamespace() == NS_USER_TALK
2143                         && $shortTitle != $user->getTitleKey()
2144                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2145                 ) {
2146                         $recipient = User::newFromName( $shortTitle, false );
2147                         if ( !$recipient ) {
2148                                 wfDebug( __METHOD__ . ": invalid username\n" );
2149                         } else {
2150                                 // Allow extensions to prevent user notification when a new message is added to their talk page
2151                                 if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this, $recipient ) ) ) {
2152                                         if ( User::isIP( $shortTitle ) ) {
2153                                                 // An anonymous user
2154                                                 $recipient->setNewtalk( true, $revision );
2155                                         } elseif ( $recipient->isLoggedIn() ) {
2156                                                 $recipient->setNewtalk( true, $revision );
2157                                         } else {
2158                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2159                                         }
2160                                 }
2161                         }
2162                 }
2163
2164                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2165                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2166                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2167                         if ( $msgtext === false || $msgtext === null ) {
2168                                 $msgtext = '';
2169                         }
2170
2171                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2172                 }
2173
2174                 if ( $options['created'] ) {
2175                         self::onArticleCreate( $this->mTitle );
2176                 } else {
2177                         self::onArticleEdit( $this->mTitle );
2178                 }
2179
2180                 wfProfileOut( __METHOD__ );
2181         }
2182
2183         /**
2184          * Edit an article without doing all that other stuff
2185          * The article must already exist; link tables etc
2186          * are not updated, caches are not flushed.
2187          *
2188          * @param string $text text submitted
2189          * @param $user User The relevant user
2190          * @param string $comment comment submitted
2191          * @param $minor Boolean: whereas it's a minor modification
2192          *
2193          * @deprecated since 1.21, use doEditContent() instead.
2194          */
2195         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2196                 ContentHandler::deprecated( __METHOD__, "1.21" );
2197
2198                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2199                 $this->doQuickEditContent( $content, $user, $comment, $minor );
2200         }
2201
2202         /**
2203          * Edit an article without doing all that other stuff
2204          * The article must already exist; link tables etc
2205          * are not updated, caches are not flushed.
2206          *
2207          * @param Content $content Content submitted
2208          * @param User $user The relevant user
2209          * @param string $comment comment submitted
2210          * @param string $serialisation_format Format for storing the content in the database
2211          * @param bool $minor Whereas it's a minor modification
2212          */
2213         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = false,
2214                 $serialisation_format = null
2215         ) {
2216                 wfProfileIn( __METHOD__ );
2217
2218                 $serialized = $content->serialize( $serialisation_format );
2219
2220                 $dbw = wfGetDB( DB_MASTER );
2221                 $revision = new Revision( array(
2222                         'title'      => $this->getTitle(), // for determining the default content model
2223                         'page'       => $this->getId(),
2224                         'text'       => $serialized,
2225                         'length'     => $content->getSize(),
2226                         'comment'    => $comment,
2227                         'minor_edit' => $minor ? 1 : 0,
2228                 ) ); // XXX: set the content object?
2229                 $revision->insertOn( $dbw );
2230                 $this->updateRevisionOn( $dbw, $revision );
2231
2232                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2233
2234                 wfProfileOut( __METHOD__ );
2235         }
2236
2237         /**
2238          * Update the article's restriction field, and leave a log entry.
2239          * This works for protection both existing and non-existing pages.
2240          *
2241          * @param array $limit set of restriction keys
2242          * @param array $expiry per restriction type expiration
2243          * @param int &$cascade Set to false if cascading protection isn't allowed.
2244          * @param string $reason
2245          * @param User $user The user updating the restrictions
2246          * @return Status
2247          */
2248         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
2249                 global $wgCascadingRestrictionLevels;
2250
2251                 if ( wfReadOnly() ) {
2252                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2253                 }
2254
2255                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2256
2257                 $id = $this->getId();
2258
2259                 if ( !$cascade ) {
2260                         $cascade = false;
2261                 }
2262
2263                 // Take this opportunity to purge out expired restrictions
2264                 Title::purgeExpiredRestrictions();
2265
2266                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2267                 // we expect a single selection, but the schema allows otherwise.
2268                 $isProtected = false;
2269                 $protect = false;
2270                 $changed = false;
2271
2272                 $dbw = wfGetDB( DB_MASTER );
2273
2274                 foreach ( $restrictionTypes as $action ) {
2275                         if ( !isset( $expiry[$action] ) ) {
2276                                 $expiry[$action] = $dbw->getInfinity();
2277                         }
2278                         if ( !isset( $limit[$action] ) ) {
2279                                 $limit[$action] = '';
2280                         } elseif ( $limit[$action] != '' ) {
2281                                 $protect = true;
2282                         }
2283
2284                         // Get current restrictions on $action
2285                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2286                         if ( $current != '' ) {
2287                                 $isProtected = true;
2288                         }
2289
2290                         if ( $limit[$action] != $current ) {
2291                                 $changed = true;
2292                         } elseif ( $limit[$action] != '' ) {
2293                                 // Only check expiry change if the action is actually being
2294                                 // protected, since expiry does nothing on an not-protected
2295                                 // action.
2296                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2297                                         $changed = true;
2298                                 }
2299                         }
2300                 }
2301
2302                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2303                         $changed = true;
2304                 }
2305
2306                 // If nothing has changed, do nothing
2307                 if ( !$changed ) {
2308                         return Status::newGood();
2309                 }
2310
2311                 if ( !$protect ) { // No protection at all means unprotection
2312                         $revCommentMsg = 'unprotectedarticle';
2313                         $logAction = 'unprotect';
2314                 } elseif ( $isProtected ) {
2315                         $revCommentMsg = 'modifiedarticleprotection';
2316                         $logAction = 'modify';
2317                 } else {
2318                         $revCommentMsg = 'protectedarticle';
2319                         $logAction = 'protect';
2320                 }
2321
2322                 if ( $id ) { // Protection of existing page
2323                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2324                                 return Status::newGood();
2325                         }
2326
2327                         // Only certain restrictions can cascade...
2328                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2329                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2330                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2331                         }
2332                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2333                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2334                         }
2335
2336                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2337                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2338                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2339                         }
2340                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2341                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2342                         }
2343
2344                         // The schema allows multiple restrictions
2345                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2346                                 $cascade = false;
2347                         }
2348
2349                         // insert null revision to identify the page protection change as edit summary
2350                         $latest = $this->getLatest();
2351                         $nullRevision = $this->insertProtectNullRevision( $revCommentMsg, $limit, $expiry, $cascade, $reason );
2352                         if ( $nullRevision === null ) {
2353                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2354                         }
2355
2356                         // Update restrictions table
2357                         foreach ( $limit as $action => $restrictions ) {
2358                                 if ( $restrictions != '' ) {
2359                                         $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
2360                                                 array( 'pr_page' => $id,
2361                                                         'pr_type' => $action,
2362                                                         'pr_level' => $restrictions,
2363                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2364                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2365                                                 ),
2366                                                 __METHOD__
2367                                         );
2368                                 } else {
2369                                         $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
2370                                                 'pr_type' => $action ), __METHOD__ );
2371                                 }
2372                         }
2373
2374                         // Clear out legacy restriction fields
2375                         $dbw->update(
2376                                 'page',
2377                                 array( 'page_restrictions' => '' ),
2378                                 array( 'page_id' => $id ),
2379                                 __METHOD__
2380                         );
2381
2382                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2383                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2384                 } else { // Protection of non-existing page (also known as "title protection")
2385                         // Cascade protection is meaningless in this case
2386                         $cascade = false;
2387
2388                         if ( $limit['create'] != '' ) {
2389                                 $dbw->replace( 'protected_titles',
2390                                         array( array( 'pt_namespace', 'pt_title' ) ),
2391                                         array(
2392                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2393                                                 'pt_title' => $this->mTitle->getDBkey(),
2394                                                 'pt_create_perm' => $limit['create'],
2395                                                 'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
2396                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2397                                                 'pt_user' => $user->getId(),
2398                                                 'pt_reason' => $reason,
2399                                         ), __METHOD__
2400                                 );
2401                         } else {
2402                                 $dbw->delete( 'protected_titles',
2403                                         array(
2404                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2405                                                 'pt_title' => $this->mTitle->getDBkey()
2406                                         ), __METHOD__
2407                                 );
2408                         }
2409                 }
2410
2411                 $this->mTitle->flushRestrictions();
2412                 InfoAction::invalidateCache( $this->mTitle );
2413
2414                 if ( $logAction == 'unprotect' ) {
2415                         $params = array();
2416                 } else {
2417                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2418                         $params = array( $protectDescriptionLog, $cascade ? 'cascade' : '' );
2419                 }
2420
2421                 // Update the protection log
2422                 $log = new LogPage( 'protect' );
2423                 $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $params, $user );
2424
2425                 return Status::newGood();
2426         }
2427
2428         /**
2429          * Insert a new null revision for this page.
2430          *
2431          * @param string $revCommentMsg comment message key for the revision
2432          * @param array $limit set of restriction keys
2433          * @param array $expiry per restriction type expiration
2434          * @param int $cascade Set to false if cascading protection isn't allowed.
2435          * @param string $reason
2436          * @return Revision|null on error
2437          */
2438         public function insertProtectNullRevision( $revCommentMsg, array $limit, array $expiry, $cascade, $reason ) {
2439                 global $wgContLang;
2440                 $dbw = wfGetDB( DB_MASTER );
2441
2442                 // Prepare a null revision to be added to the history
2443                 $editComment = $wgContLang->ucfirst(
2444                         wfMessage(
2445                                 $revCommentMsg,
2446                                 $this->mTitle->getPrefixedText()
2447                         )->inContentLanguage()->text()
2448                 );
2449                 if ( $reason ) {
2450                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2451                 }
2452                 $protectDescription = $this->protectDescription( $limit, $expiry );
2453                 if ( $protectDescription ) {
2454                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2455                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )->inContentLanguage()->text();
2456                 }
2457                 if ( $cascade ) {
2458                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2459                         $editComment .= wfMessage( 'brackets' )->params(
2460                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2461                         )->inContentLanguage()->text();
2462                 }
2463
2464                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true );
2465                 if ( $nullRev ) {
2466                         $nullRev->insertOn( $dbw );
2467
2468                         // Update page record and touch page
2469                         $oldLatest = $nullRev->getParentId();
2470                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2471                 }
2472
2473                 return $nullRev;
2474         }
2475
2476         /**
2477          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2478          * @return string
2479          */
2480         protected function formatExpiry( $expiry ) {
2481                 global $wgContLang;
2482                 $dbr = wfGetDB( DB_SLAVE );
2483
2484                 $encodedExpiry = $dbr->encodeExpiry( $expiry );
2485                 if ( $encodedExpiry != 'infinity' ) {
2486                         return wfMessage(
2487                                 'protect-expiring',
2488                                 $wgContLang->timeanddate( $expiry, false, false ),
2489                                 $wgContLang->date( $expiry, false, false ),
2490                                 $wgContLang->time( $expiry, false, false )
2491                         )->inContentLanguage()->text();
2492                 } else {
2493                         return wfMessage( 'protect-expiry-indefinite' )
2494                                 ->inContentLanguage()->text();
2495                 }
2496         }
2497
2498         /**
2499          * Builds the description to serve as comment for the edit.
2500          *
2501          * @param array $limit set of restriction keys
2502          * @param array $expiry per restriction type expiration
2503          * @return string
2504          */
2505         public function protectDescription( array $limit, array $expiry ) {
2506                 $protectDescription = '';
2507
2508                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2509                         # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
2510                         # All possible message keys are listed here for easier grepping:
2511                         # * restriction-create
2512                         # * restriction-edit
2513                         # * restriction-move
2514                         # * restriction-upload
2515                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2516                         # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
2517                         # with '' filtered out. All possible message keys are listed below:
2518                         # * protect-level-autoconfirmed
2519                         # * protect-level-sysop
2520                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )->inContentLanguage()->text();
2521
2522                         $expiryText = $this->formatExpiry( $expiry[$action] );
2523
2524                         if ( $protectDescription !== '' ) {
2525                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2526                         }
2527                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2528                                 ->params( $actionText, $restrictionsText, $expiryText )
2529                                 ->inContentLanguage()->text();
2530                 }
2531
2532                 return $protectDescription;
2533         }
2534
2535         /**
2536          * Builds the description to serve as comment for the log entry.
2537          *
2538          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2539          * protect description text. Keep them in old format to avoid breaking compatibility.
2540          * TODO: Fix protection log to store structured description and format it on-the-fly.
2541          *
2542          * @param array $limit set of restriction keys
2543          * @param array $expiry per restriction type expiration
2544          * @return string
2545          */
2546         public function protectDescriptionLog( array $limit, array $expiry ) {
2547                 global $wgContLang;
2548
2549                 $protectDescriptionLog = '';
2550
2551                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2552                         $expiryText = $this->formatExpiry( $expiry[$action] );
2553                         $protectDescriptionLog .= $wgContLang->getDirMark() . "[$action=$restrictions] ($expiryText)";
2554                 }
2555
2556                 return trim( $protectDescriptionLog );
2557         }
2558
2559         /**
2560          * Take an array of page restrictions and flatten it to a string
2561          * suitable for insertion into the page_restrictions field.
2562          * @param $limit Array
2563          * @throws MWException
2564          * @return String
2565          */
2566         protected static function flattenRestrictions( $limit ) {
2567                 if ( !is_array( $limit ) ) {
2568                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2569                 }
2570
2571                 $bits = array();
2572                 ksort( $limit );
2573
2574                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2575                         $bits[] = "$action=$restrictions";
2576                 }
2577
2578                 return implode( ':', $bits );
2579         }
2580
2581         /**
2582          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2583          * backwards compatibility, if you care about error reporting you should use
2584          * doDeleteArticleReal() instead.
2585          *
2586          * Deletes the article with database consistency, writes logs, purges caches
2587          *
2588          * @param string $reason delete reason for deletion log
2589          * @param $suppress boolean suppress all revisions and log the deletion in
2590          *        the suppression log instead of the deletion log
2591          * @param int $id article ID
2592          * @param $commit boolean defaults to true, triggers transaction end
2593          * @param &$error Array of errors to append to
2594          * @param $user User The deleting user
2595          * @return boolean true if successful
2596          */
2597         public function doDeleteArticle(
2598                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2599         ) {
2600                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2601                 return $status->isGood();
2602         }
2603
2604         /**
2605          * Back-end article deletion
2606          * Deletes the article with database consistency, writes logs, purges caches
2607          *
2608          * @since 1.19
2609          *
2610          * @param string $reason delete reason for deletion log
2611          * @param $suppress boolean suppress all revisions and log the deletion in
2612          *        the suppression log instead of the deletion log
2613          * @param int $id article ID
2614          * @param $commit boolean defaults to true, triggers transaction end
2615          * @param &$error Array of errors to append to
2616          * @param $user User The deleting user
2617          * @return Status: Status object; if successful, $status->value is the log_id of the
2618          *                 deletion log entry. If the page couldn't be deleted because it wasn't
2619          *                 found, $status is a non-fatal 'cannotdelete' error
2620          */
2621         public function doDeleteArticleReal(
2622                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2623         ) {
2624                 global $wgUser, $wgContentHandlerUseDB;
2625
2626                 wfDebug( __METHOD__ . "\n" );
2627
2628                 $status = Status::newGood();
2629
2630                 if ( $this->mTitle->getDBkey() === '' ) {
2631                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2632                         return $status;
2633                 }
2634
2635                 $user = is_null( $user ) ? $wgUser : $user;
2636                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2637                         if ( $status->isOK() ) {
2638                                 // Hook aborted but didn't set a fatal status
2639                                 $status->fatal( 'delete-hook-aborted' );
2640                         }
2641                         return $status;
2642                 }
2643
2644                 if ( $id == 0 ) {
2645                         $this->loadPageData( 'forupdate' );
2646                         $id = $this->getID();
2647                         if ( $id == 0 ) {
2648                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2649                                 return $status;
2650                         }
2651                 }
2652
2653                 // Bitfields to further suppress the content
2654                 if ( $suppress ) {
2655                         $bitfield = 0;
2656                         // This should be 15...
2657                         $bitfield |= Revision::DELETED_TEXT;
2658                         $bitfield |= Revision::DELETED_COMMENT;
2659                         $bitfield |= Revision::DELETED_USER;
2660                         $bitfield |= Revision::DELETED_RESTRICTED;
2661                 } else {
2662                         $bitfield = 'rev_deleted';
2663                 }
2664
2665                 // we need to remember the old content so we can use it to generate all deletion updates.
2666                 $content = $this->getContent( Revision::RAW );
2667
2668                 $dbw = wfGetDB( DB_MASTER );
2669                 $dbw->begin( __METHOD__ );
2670                 // For now, shunt the revision data into the archive table.
2671                 // Text is *not* removed from the text table; bulk storage
2672                 // is left intact to avoid breaking block-compression or
2673                 // immutable storage schemes.
2674                 //
2675                 // For backwards compatibility, note that some older archive
2676                 // table entries will have ar_text and ar_flags fields still.
2677                 //
2678                 // In the future, we may keep revisions and mark them with
2679                 // the rev_deleted field, which is reserved for this purpose.
2680
2681                 $row = array(
2682                         'ar_namespace'  => 'page_namespace',
2683                         'ar_title'      => 'page_title',
2684                         'ar_comment'    => 'rev_comment',
2685                         'ar_user'       => 'rev_user',
2686                         'ar_user_text'  => 'rev_user_text',
2687                         'ar_timestamp'  => 'rev_timestamp',
2688                         'ar_minor_edit' => 'rev_minor_edit',
2689                         'ar_rev_id'     => 'rev_id',
2690                         'ar_parent_id'  => 'rev_parent_id',
2691                         'ar_text_id'    => 'rev_text_id',
2692                         'ar_text'       => '\'\'', // Be explicit to appease
2693                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2694                         'ar_len'        => 'rev_len',
2695                         'ar_page_id'    => 'page_id',
2696                         'ar_deleted'    => $bitfield,
2697                         'ar_sha1'       => 'rev_sha1',
2698                 );
2699
2700                 if ( $wgContentHandlerUseDB ) {
2701                         $row['ar_content_model'] = 'rev_content_model';
2702                         $row['ar_content_format'] = 'rev_content_format';
2703                 }
2704
2705                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2706                         $row,
2707                         array(
2708                                 'page_id' => $id,
2709                                 'page_id = rev_page'
2710                         ), __METHOD__
2711                 );
2712
2713                 // Now that it's safely backed up, delete it
2714                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2715                 $ok = ( $dbw->affectedRows() > 0 ); // $id could be laggy
2716
2717                 if ( !$ok ) {
2718                         $dbw->rollback( __METHOD__ );
2719                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2720                         return $status;
2721                 }
2722
2723                 if ( !$dbw->cascadingDeletes() ) {
2724                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2725                 }
2726
2727                 $this->doDeleteUpdates( $id, $content );
2728
2729                 // Log the deletion, if the page was suppressed, log it at Oversight instead
2730                 $logtype = $suppress ? 'suppress' : 'delete';
2731
2732                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2733                 $logEntry->setPerformer( $user );
2734                 $logEntry->setTarget( $this->mTitle );
2735                 $logEntry->setComment( $reason );
2736                 $logid = $logEntry->insert();
2737                 $logEntry->publish( $logid );
2738
2739                 if ( $commit ) {
2740                         $dbw->commit( __METHOD__ );
2741                 }
2742
2743                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id, $content, $logEntry ) );
2744                 $status->value = $logid;
2745                 return $status;
2746         }
2747
2748         /**
2749          * Do some database updates after deletion
2750          *
2751          * @param int $id page_id value of the page being deleted
2752          * @param $content Content: optional page content to be used when determining the required updates.
2753          *        This may be needed because $this->getContent() may already return null when the page proper was deleted.
2754          */
2755         public function doDeleteUpdates( $id, Content $content = null ) {
2756                 // update site status
2757                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2758
2759                 // remove secondary indexes, etc
2760                 $updates = $this->getDeletionUpdates( $content );
2761                 DataUpdate::runUpdates( $updates );
2762
2763                 // Reparse any pages transcluding this page
2764                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
2765
2766                 // Clear caches
2767                 WikiPage::onArticleDelete( $this->mTitle );
2768
2769                 // Reset this object and the Title object
2770                 $this->loadFromRow( false, self::READ_LATEST );
2771
2772                 // Search engine
2773                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
2774         }
2775
2776         /**
2777          * Roll back the most recent consecutive set of edits to a page
2778          * from the same user; fails if there are no eligible edits to
2779          * roll back to, e.g. user is the sole contributor. This function
2780          * performs permissions checks on $user, then calls commitRollback()
2781          * to do the dirty work
2782          *
2783          * @todo Separate the business/permission stuff out from backend code
2784          *
2785          * @param string $fromP Name of the user whose edits to rollback.
2786          * @param string $summary Custom summary. Set to default summary if empty.
2787          * @param string $token Rollback token.
2788          * @param $bot Boolean: If true, mark all reverted edits as bot.
2789          *
2790          * @param array $resultDetails contains result-specific array of additional values
2791          *    'alreadyrolled' : 'current' (rev)
2792          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2793          *
2794          * @param $user User The user performing the rollback
2795          * @return array of errors, each error formatted as
2796          *   array(messagekey, param1, param2, ...).
2797          * On success, the array is empty.  This array can also be passed to
2798          * OutputPage::showPermissionsErrorPage().
2799          */
2800         public function doRollback(
2801                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2802         ) {
2803                 $resultDetails = null;
2804
2805                 // Check permissions
2806                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2807                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2808                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2809
2810                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2811                         $errors[] = array( 'sessionfailure' );
2812                 }
2813
2814                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2815                         $errors[] = array( 'actionthrottledtext' );
2816                 }
2817
2818                 // If there were errors, bail out now
2819                 if ( !empty( $errors ) ) {
2820                         return $errors;
2821                 }
2822
2823                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2824         }
2825
2826         /**
2827          * Backend implementation of doRollback(), please refer there for parameter
2828          * and return value documentation
2829          *
2830          * NOTE: This function does NOT check ANY permissions, it just commits the
2831          * rollback to the DB. Therefore, you should only call this function direct-
2832          * ly if you want to use custom permissions checks. If you don't, use
2833          * doRollback() instead.
2834          * @param string $fromP Name of the user whose edits to rollback.
2835          * @param string $summary Custom summary. Set to default summary if empty.
2836          * @param $bot Boolean: If true, mark all reverted edits as bot.
2837          *
2838          * @param array $resultDetails contains result-specific array of additional values
2839          * @param $guser User The user performing the rollback
2840          * @return array
2841          */
2842         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2843                 global $wgUseRCPatrol, $wgContLang;
2844
2845                 $dbw = wfGetDB( DB_MASTER );
2846
2847                 if ( wfReadOnly() ) {
2848                         return array( array( 'readonlytext' ) );
2849                 }
2850
2851                 // Get the last editor
2852                 $current = $this->getRevision();
2853                 if ( is_null( $current ) ) {
2854                         // Something wrong... no page?
2855                         return array( array( 'notanarticle' ) );
2856                 }
2857
2858                 $from = str_replace( '_', ' ', $fromP );
2859                 // User name given should match up with the top revision.
2860                 // If the user was deleted then $from should be empty.
2861                 if ( $from != $current->getUserText() ) {
2862                         $resultDetails = array( 'current' => $current );
2863                         return array( array( 'alreadyrolled',
2864                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2865                                 htmlspecialchars( $fromP ),
2866                                 htmlspecialchars( $current->getUserText() )
2867                         ) );
2868                 }
2869
2870                 // Get the last edit not by this guy...
2871                 // Note: these may not be public values
2872                 $user = intval( $current->getRawUser() );
2873                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2874                 $s = $dbw->selectRow( 'revision',
2875                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2876                         array( 'rev_page' => $current->getPage(),
2877                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2878                         ), __METHOD__,
2879                         array( 'USE INDEX' => 'page_timestamp',
2880                                 'ORDER BY' => 'rev_timestamp DESC' )
2881                         );
2882                 if ( $s === false ) {
2883                         // No one else ever edited this page
2884                         return array( array( 'cantrollback' ) );
2885                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2886                         // Only admins can see this text
2887                         return array( array( 'notvisiblerev' ) );
2888                 }
2889
2890                 $set = array();
2891                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2892                         // Mark all reverted edits as bot
2893                         $set['rc_bot'] = 1;
2894                 }
2895
2896                 if ( $wgUseRCPatrol ) {
2897                         // Mark all reverted edits as patrolled
2898                         $set['rc_patrolled'] = 1;
2899                 }
2900
2901                 if ( count( $set ) ) {
2902                         $dbw->update( 'recentchanges', $set,
2903                                 array( /* WHERE */
2904                                         'rc_cur_id' => $current->getPage(),
2905                                         'rc_user_text' => $current->getUserText(),
2906                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
2907                                 ), __METHOD__
2908                         );
2909                 }
2910
2911                 // Generate the edit summary if necessary
2912                 $target = Revision::newFromId( $s->rev_id );
2913                 if ( empty( $summary ) ) {
2914                         if ( $from == '' ) { // no public user name
2915                                 $summary = wfMessage( 'revertpage-nouser' );
2916                         } else {
2917                                 $summary = wfMessage( 'revertpage' );
2918                         }
2919                 }
2920
2921                 // Allow the custom summary to use the same args as the default message
2922                 $args = array(
2923                         $target->getUserText(), $from, $s->rev_id,
2924                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2925                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2926                 );
2927                 if ( $summary instanceof Message ) {
2928                         $summary = $summary->params( $args )->inContentLanguage()->text();
2929                 } else {
2930                         $summary = wfMsgReplaceArgs( $summary, $args );
2931                 }
2932
2933                 // Trim spaces on user supplied text
2934                 $summary = trim( $summary );
2935
2936                 // Truncate for whole multibyte characters.
2937                 $summary = $wgContLang->truncate( $summary, 255 );
2938
2939                 // Save
2940                 $flags = EDIT_UPDATE;
2941
2942                 if ( $guser->isAllowed( 'minoredit' ) ) {
2943                         $flags |= EDIT_MINOR;
2944                 }
2945
2946                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
2947                         $flags |= EDIT_FORCE_BOT;
2948                 }
2949
2950                 // Actually store the edit
2951                 $status = $this->doEditContent( $target->getContent(), $summary, $flags, $target->getId(), $guser );
2952
2953                 if ( !$status->isOK() ) {
2954                         return $status->getErrorsArray();
2955                 }
2956
2957                 if ( !empty( $status->value['revision'] ) ) {
2958                         $revId = $status->value['revision']->getId();
2959                 } else {
2960                         $revId = false;
2961                 }
2962
2963                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
2964
2965                 $resultDetails = array(
2966                         'summary' => $summary,
2967                         'current' => $current,
2968                         'target' => $target,
2969                         'newid' => $revId
2970                 );
2971
2972                 return array();
2973         }
2974
2975         /**
2976          * The onArticle*() functions are supposed to be a kind of hooks
2977          * which should be called whenever any of the specified actions
2978          * are done.
2979          *
2980          * This is a good place to put code to clear caches, for instance.
2981          *
2982          * This is called on page move and undelete, as well as edit
2983          *
2984          * @param $title Title object
2985          */
2986         public static function onArticleCreate( $title ) {
2987                 // Update existence markers on article/talk tabs...
2988                 if ( $title->isTalkPage() ) {
2989                         $other = $title->getSubjectPage();
2990                 } else {
2991                         $other = $title->getTalkPage();
2992                 }
2993
2994                 $other->invalidateCache();
2995                 $other->purgeSquid();
2996
2997                 $title->touchLinks();
2998                 $title->purgeSquid();
2999                 $title->deleteTitleProtection();
3000         }
3001
3002         /**
3003          * Clears caches when article is deleted
3004          *
3005          * @param $title Title
3006          */
3007         public static function onArticleDelete( $title ) {
3008                 // Update existence markers on article/talk tabs...
3009                 if ( $title->isTalkPage() ) {
3010                         $other = $title->getSubjectPage();
3011                 } else {
3012                         $other = $title->getTalkPage();
3013                 }
3014
3015                 $other->invalidateCache();
3016                 $other->purgeSquid();
3017
3018                 $title->touchLinks();
3019                 $title->purgeSquid();
3020
3021                 // File cache
3022                 HTMLFileCache::clearFileCache( $title );
3023                 InfoAction::invalidateCache( $title );
3024
3025                 // Messages
3026                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3027                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3028                 }
3029
3030                 // Images
3031                 if ( $title->getNamespace() == NS_FILE ) {
3032                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3033                         $update->doUpdate();
3034                 }
3035
3036                 // User talk pages
3037                 if ( $title->getNamespace() == NS_USER_TALK ) {
3038                         $user = User::newFromName( $title->getText(), false );
3039                         if ( $user ) {
3040                                 $user->setNewtalk( false );
3041                         }
3042                 }
3043
3044                 // Image redirects
3045                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3046         }
3047
3048         /**
3049          * Purge caches on page update etc
3050          *
3051          * @param $title Title object
3052          * @todo Verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
3053          */
3054         public static function onArticleEdit( $title ) {
3055                 // Invalidate caches of articles which include this page
3056                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
3057
3058                 // Invalidate the caches of all pages which redirect here
3059                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
3060
3061                 // Purge squid for this page only
3062                 $title->purgeSquid();
3063
3064                 // Clear file cache for this page only
3065                 HTMLFileCache::clearFileCache( $title );
3066                 InfoAction::invalidateCache( $title );
3067         }
3068
3069         /**#@-*/
3070
3071         /**
3072          * Returns a list of categories this page is a member of.
3073          * Results will include hidden categories
3074          *
3075          * @return TitleArray
3076          */
3077         public function getCategories() {
3078                 $id = $this->getId();
3079                 if ( $id == 0 ) {
3080                         return TitleArray::newFromResult( new FakeResultWrapper( array() ) );
3081                 }
3082
3083                 $dbr = wfGetDB( DB_SLAVE );
3084                 $res = $dbr->select( 'categorylinks',
3085                         array( 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ),
3086                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3087                         // as not being aliases, and NS_CATEGORY is numeric
3088                         array( 'cl_from' => $id ),
3089                         __METHOD__ );
3090
3091                 return TitleArray::newFromResult( $res );
3092         }
3093
3094         /**
3095          * Returns a list of hidden categories this page is a member of.
3096          * Uses the page_props and categorylinks tables.
3097          *
3098          * @return Array of Title objects
3099          */
3100         public function getHiddenCategories() {
3101                 $result = array();
3102                 $id = $this->getId();
3103
3104                 if ( $id == 0 ) {
3105                         return array();
3106                 }
3107
3108                 $dbr = wfGetDB( DB_SLAVE );
3109                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3110                         array( 'cl_to' ),
3111                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3112                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
3113                         __METHOD__ );
3114
3115                 if ( $res !== false ) {
3116                         foreach ( $res as $row ) {
3117                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3118                         }
3119                 }
3120
3121                 return $result;
3122         }
3123
3124         /**
3125          * Return an applicable autosummary if one exists for the given edit.
3126          * @param string|null $oldtext the previous text of the page.
3127          * @param string|null $newtext The submitted text of the page.
3128          * @param int $flags bitmask: a bitmask of flags submitted for the edit.
3129          * @return string An appropriate autosummary, or an empty string.
3130          *
3131          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3132          */
3133         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3134                 // NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
3135
3136                 ContentHandler::deprecated( __METHOD__, '1.21' );
3137
3138                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3139                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3140                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3141
3142                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3143         }
3144
3145         /**
3146          * Auto-generates a deletion reason
3147          *
3148          * @param &$hasHistory Boolean: whether the page has a history
3149          * @return mixed String containing deletion reason or empty string, or boolean false
3150          *    if no revision occurred
3151          */
3152         public function getAutoDeleteReason( &$hasHistory ) {
3153                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3154         }
3155
3156         /**
3157          * Update all the appropriate counts in the category table, given that
3158          * we've added the categories $added and deleted the categories $deleted.
3159          *
3160          * @param array $added   The names of categories that were added
3161          * @param array $deleted The names of categories that were deleted
3162          */
3163         public function updateCategoryCounts( array $added, array $deleted ) {
3164                 $that = $this;
3165                 $method = __METHOD__;
3166                 $dbw = wfGetDB( DB_MASTER );
3167
3168                 // Do this at the end of the commit to reduce lock wait timeouts
3169                 $dbw->onTransactionPreCommitOrIdle(
3170                         function() use ( $dbw, $that, $method, $added, $deleted ) {
3171                                 $ns = $that->getTitle()->getNamespace();
3172
3173                                 $addFields = array( 'cat_pages = cat_pages + 1' );
3174                                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3175                                 if ( $ns == NS_CATEGORY ) {
3176                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3177                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3178                                 } elseif ( $ns == NS_FILE ) {
3179                                         $addFields[] = 'cat_files = cat_files + 1';
3180                                         $removeFields[] = 'cat_files = cat_files - 1';
3181                                 }
3182
3183                                 if ( count( $added ) ) {
3184                                         $insertRows = array();
3185                                         foreach ( $added as $cat ) {
3186                                                 $insertRows[] = array(
3187                                                         'cat_title'   => $cat,
3188                                                         'cat_pages'   => 1,
3189                                                         'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3190                                                         'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3191                                                 );
3192                                         }
3193                                         $dbw->upsert(
3194                                                 'category',
3195                                                 $insertRows,
3196                                                 array( 'cat_title' ),
3197                                                 $addFields,
3198                                                 $method
3199                                         );
3200                                 }
3201
3202                                 if ( count( $deleted ) ) {
3203                                         $dbw->update(
3204                                                 'category',
3205                                                 $removeFields,
3206                                                 array( 'cat_title' => $deleted ),
3207                                                 $method
3208                                         );
3209                                 }
3210
3211                                 foreach ( $added as $catName ) {
3212                                         $cat = Category::newFromName( $catName );
3213                                         wfRunHooks( 'CategoryAfterPageAdded', array( $cat, $that ) );
3214                                 }
3215
3216                                 foreach ( $deleted as $catName ) {
3217                                         $cat = Category::newFromName( $catName );
3218                                         wfRunHooks( 'CategoryAfterPageRemoved', array( $cat, $that ) );
3219                                 }
3220                         }
3221                 );
3222         }
3223
3224         /**
3225          * Updates cascading protections
3226          *
3227          * @param $parserOutput ParserOutput object for the current version
3228          */
3229         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
3230                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
3231                         return;
3232                 }
3233
3234                 // templatelinks table may have become out of sync,
3235                 // especially if using variable-based transclusions.
3236                 // For paranoia, check if things have changed and if
3237                 // so apply updates to the database. This will ensure
3238                 // that cascaded protections apply as soon as the changes
3239                 // are visible.
3240
3241                 // Get templates from templatelinks
3242                 $id = $this->getId();
3243
3244                 $tlTemplates = array();
3245
3246                 $dbr = wfGetDB( DB_SLAVE );
3247                 $res = $dbr->select( array( 'templatelinks' ),
3248                         array( 'tl_namespace', 'tl_title' ),
3249                         array( 'tl_from' => $id ),
3250                         __METHOD__
3251                 );
3252
3253                 foreach ( $res as $row ) {
3254                         $tlTemplates["{$row->tl_namespace}:{$row->tl_title}"] = true;
3255                 }
3256
3257                 // Get templates from parser output.
3258                 $poTemplates = array();
3259                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3260                         foreach ( $templates as $dbk => $id ) {
3261                                 $poTemplates["$ns:$dbk"] = true;
3262                         }
3263                 }
3264
3265                 // Get the diff
3266                 $templates_diff = array_diff_key( $poTemplates, $tlTemplates );
3267
3268                 if ( count( $templates_diff ) > 0 ) {
3269                         // Whee, link updates time.
3270                         // Note: we are only interested in links here. We don't need to get other DataUpdate items from the parser output.
3271                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3272                         $u->doUpdate();
3273                 }
3274         }
3275
3276         /**
3277          * Return a list of templates used by this article.
3278          * Uses the templatelinks table
3279          *
3280          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
3281          * @return Array of Title objects
3282          */
3283         public function getUsedTemplates() {
3284                 return $this->mTitle->getTemplateLinksFrom();
3285         }
3286
3287         /**
3288          * Perform article updates on a special page creation.
3289          *
3290          * @param $rev Revision object
3291          *
3292          * @todo This is a shitty interface function. Kill it and replace the
3293          * other shitty functions like doEditUpdates and such so it's not needed
3294          * anymore.
3295          * @deprecated since 1.18, use doEditUpdates()
3296          */
3297         public function createUpdates( $rev ) {
3298                 wfDeprecated( __METHOD__, '1.18' );
3299                 global $wgUser;
3300                 $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
3301         }
3302
3303         /**
3304          * This function is called right before saving the wikitext,
3305          * so we can do things like signatures and links-in-context.
3306          *
3307          * @deprecated in 1.19; use Parser::preSaveTransform() instead
3308          * @param string $text article contents
3309          * @param $user User object: user doing the edit
3310          * @param $popts ParserOptions object: parser options, default options for
3311          *               the user loaded if null given
3312          * @return string article contents with altered wikitext markup (signatures
3313          *      converted, {{subst:}}, templates, etc.)
3314          */
3315         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3316                 global $wgParser, $wgUser;
3317
3318                 wfDeprecated( __METHOD__, '1.19' );
3319
3320                 $user = is_null( $user ) ? $wgUser : $user;
3321
3322                 if ( $popts === null ) {
3323                         $popts = ParserOptions::newFromUser( $user );
3324                 }
3325
3326                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3327         }
3328
3329         /**
3330          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
3331          *
3332          * @deprecated in 1.19; use Title::isBigDeletion() instead.
3333          * @return bool
3334          */
3335         public function isBigDeletion() {
3336                 wfDeprecated( __METHOD__, '1.19' );
3337                 return $this->mTitle->isBigDeletion();
3338         }
3339
3340         /**
3341          * Get the  approximate revision count of this page.
3342          *
3343          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
3344          * @return int
3345          */
3346         public function estimateRevisionCount() {
3347                 wfDeprecated( __METHOD__, '1.19' );
3348                 return $this->mTitle->estimateRevisionCount();
3349         }
3350
3351         /**
3352          * Update the article's restriction field, and leave a log entry.
3353          *
3354          * @deprecated since 1.19
3355          * @param array $limit set of restriction keys
3356          * @param $reason String
3357          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
3358          * @param array $expiry per restriction type expiration
3359          * @param $user User The user updating the restrictions
3360          * @return bool true on success
3361          */
3362         public function updateRestrictions(
3363                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3364         ) {
3365                 global $wgUser;
3366
3367                 $user = is_null( $user ) ? $wgUser : $user;
3368
3369                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3370         }
3371
3372         /**
3373          * @deprecated since 1.18
3374          */
3375         public function quickEdit( $text, $comment = '', $minor = 0 ) {
3376                 wfDeprecated( __METHOD__, '1.18' );
3377                 global $wgUser;
3378                 $this->doQuickEdit( $text, $wgUser, $comment, $minor );
3379         }
3380
3381         /**
3382          * @deprecated since 1.18
3383          */
3384         public function viewUpdates() {
3385                 wfDeprecated( __METHOD__, '1.18' );
3386                 global $wgUser;
3387                 $this->doViewUpdates( $wgUser );
3388         }
3389
3390         /**
3391          * @deprecated since 1.18
3392          * @param $oldid int
3393          * @return bool
3394          */
3395         public function useParserCache( $oldid ) {
3396                 wfDeprecated( __METHOD__, '1.18' );
3397                 global $wgUser;
3398                 return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
3399         }
3400
3401         /**
3402          * Returns a list of updates to be performed when this page is deleted. The updates should remove any information
3403          * about this page from secondary data stores such as links tables.
3404          *
3405          * @param Content|null $content optional Content object for determining the necessary updates
3406          * @return Array an array of DataUpdates objects
3407          */
3408         public function getDeletionUpdates( Content $content = null ) {
3409                 if ( !$content ) {
3410                         // load content object, which may be used to determine the necessary updates
3411                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3412                         $content = $this->getContent( Revision::RAW );
3413                 }
3414
3415                 if ( !$content ) {
3416                         $updates = array();
3417                 } else {
3418                         $updates = $content->getDeletionUpdates( $this );
3419                 }
3420
3421                 wfRunHooks( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3422                 return $updates;
3423         }
3424
3425 }
3426
3427 class PoolWorkArticleView extends PoolCounterWork {
3428
3429         /**
3430          * @var Page
3431          */
3432         private $page;
3433
3434         /**
3435          * @var string
3436          */
3437         private $cacheKey;
3438
3439         /**
3440          * @var integer
3441          */
3442         private $revid;
3443
3444         /**
3445          * @var ParserOptions
3446          */
3447         private $parserOptions;
3448
3449         /**
3450          * @var Content|null
3451          */
3452         private $content = null;
3453
3454         /**
3455          * @var ParserOutput|bool
3456          */
3457         private $parserOutput = false;
3458
3459         /**
3460          * @var bool
3461          */
3462         private $isDirty = false;
3463
3464         /**
3465          * @var Status|bool
3466          */
3467         private $error = false;
3468
3469         /**
3470          * Constructor
3471          *
3472          * @param $page Page|WikiPage
3473          * @param $revid Integer: ID of the revision being parsed
3474          * @param $useParserCache Boolean: whether to use the parser cache
3475          * @param $parserOptions parserOptions to use for the parse operation
3476          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
3477          */
3478         function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null ) {
3479                 if ( is_string( $content ) ) { // BC: old style call
3480                         $modelId = $page->getRevision()->getContentModel();
3481                         $format = $page->getRevision()->getContentFormat();
3482                         $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelId, $format );
3483                 }
3484
3485                 $this->page = $page;
3486                 $this->revid = $revid;
3487                 $this->cacheable = $useParserCache;
3488                 $this->parserOptions = $parserOptions;
3489                 $this->content = $content;
3490                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3491                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3492         }
3493
3494         /**
3495          * Get the ParserOutput from this object, or false in case of failure
3496          *
3497          * @return ParserOutput
3498          */
3499         public function getParserOutput() {
3500                 return $this->parserOutput;
3501         }
3502
3503         /**
3504          * Get whether the ParserOutput is a dirty one (i.e. expired)
3505          *
3506          * @return bool
3507          */
3508         public function getIsDirty() {
3509                 return $this->isDirty;
3510         }
3511
3512         /**
3513          * Get a Status object in case of error or false otherwise
3514          *
3515          * @return Status|bool
3516          */
3517         public function getError() {
3518                 return $this->error;
3519         }
3520
3521         /**
3522          * @return bool
3523          */
3524         function doWork() {
3525                 global $wgUseFileCache;
3526
3527                 // @todo several of the methods called on $this->page are not declared in Page, but present
3528                 //        in WikiPage and delegated by Article.
3529
3530                 $isCurrent = $this->revid === $this->page->getLatest();
3531
3532                 if ( $this->content !== null ) {
3533                         $content = $this->content;
3534                 } elseif ( $isCurrent ) {
3535                         // XXX: why use RAW audience here, and PUBLIC (default) below?
3536                         $content = $this->page->getContent( Revision::RAW );
3537                 } else {
3538                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3539
3540                         if ( $rev === null ) {
3541                                 $content = null;
3542                         } else {
3543                                 // XXX: why use PUBLIC audience here (default), and RAW above?
3544                                 $content = $rev->getContent();
3545                         }
3546                 }
3547
3548                 if ( $content === null ) {
3549                         return false;
3550                 }
3551
3552                 // Reduce effects of race conditions for slow parses (bug 46014)
3553                 $cacheTime = wfTimestampNow();
3554
3555                 $time = - microtime( true );
3556                 $this->parserOutput = $content->getParserOutput( $this->page->getTitle(), $this->revid, $this->parserOptions );
3557                 $time += microtime( true );
3558
3559                 // Timing hack
3560                 if ( $time > 3 ) {
3561                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3562                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3563                 }
3564
3565                 if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
3566                         ParserCache::singleton()->save(
3567                                 $this->parserOutput, $this->page, $this->parserOptions, $cacheTime );
3568                 }
3569
3570                 // Make sure file cache is not used on uncacheable content.
3571                 // Output that has magic words in it can still use the parser cache
3572                 // (if enabled), though it will generally expire sooner.
3573                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3574                         $wgUseFileCache = false;
3575                 }
3576
3577                 if ( $isCurrent ) {
3578                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3579                 }
3580
3581                 return true;
3582         }
3583
3584         /**
3585          * @return bool
3586          */
3587         function getCachedWork() {
3588                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3589
3590                 if ( $this->parserOutput === false ) {
3591                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3592                         return false;
3593                 } else {
3594                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3595                         return true;
3596                 }
3597         }
3598
3599         /**
3600          * @return bool
3601          */
3602         function fallback() {
3603                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3604
3605                 if ( $this->parserOutput === false ) {
3606                         wfDebugLog( 'dirty', "dirty missing\n" );
3607                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3608                         return false;
3609                 } else {
3610                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3611                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
3612                         $this->isDirty = true;
3613                         return true;
3614                 }
3615         }
3616
3617         /**
3618          * @param $status Status
3619          * @return bool
3620          */
3621         function error( $status ) {
3622                 $this->error = $status;
3623                 return false;
3624         }
3625 }