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         public $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 string
  88          */
  89         protected $mLinksUpdated = '19700101000000';
  90
  91         /**
  92          * @var int|null
  93          */
  94         protected $mCounter = null;
  95
  96         /**
  97          * Constructor and clear the article
  98          * @param $title Title Reference to a Title object.
  99          */
 100         public function __construct( Title $title ) {
 101                 $this->mTitle = $title;
 102         }
 103
 104         /**
 105          * Create a WikiPage object of the appropriate class for the given title.
 106          *
 107          * @param Title $title
 108          *
 109          * @throws MWException
 110          * @return WikiPage Object of the appropriate type
 111          */
 112         public static function factory( Title $title ) {
 113                 $ns = $title->getNamespace();
 114
 115                 if ( $ns == NS_MEDIA ) {
 116                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 117                 } elseif ( $ns < 0 ) {
 118                         throw new MWException( "Invalid or virtual namespace $ns given." );
 119                 }
 120
 121                 switch ( $ns ) {
 122                         case NS_FILE:
 123                                 $page = new WikiFilePage( $title );
 124                                 break;
 125                         case NS_CATEGORY:
 126                                 $page = new WikiCategoryPage( $title );
 127                                 break;
 128                         default:
 129                                 $page = new WikiPage( $title );
 130                 }
 131
 132                 return $page;
 133         }
 134
 135         /**
 136          * Constructor from a page id
 137          *
 138          * @param int $id article ID to load
 139          * @param string|int $from one of the following values:
 140          *        - "fromdb" or WikiPage::READ_NORMAL to select from a slave database
 141          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 142          *
 143          * @return WikiPage|null
 144          */
 145         public static function newFromID( $id, $from = 'fromdb' ) {
 146                 // page id's are never 0 or negative, see bug 61166
 147                 if ( $id < 1 ) {
 148                         return null;
 149                 }
 150
 151                 $from = self::convertSelectType( $from );
 152                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_SLAVE );
 153                 $row = $db->selectRow( 'page', self::selectFields(), array( 'page_id' => $id ), __METHOD__ );
 154                 if ( !$row ) {
 155                         return null;
 156                 }
 157                 return self::newFromRow( $row, $from );
 158         }
 159
 160         /**
 161          * Constructor from a database row
 162          *
 163          * @since 1.20
 164          * @param $row object: database row containing at least fields returned
 165          *        by selectFields().
 166          * @param string|int $from source of $data:
 167          *        - "fromdb" or WikiPage::READ_NORMAL: from a slave DB
 168          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 169          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 170          * @return WikiPage
 171          */
 172         public static function newFromRow( $row, $from = 'fromdb' ) {
 173                 $page = self::factory( Title::newFromRow( $row ) );
 174                 $page->loadFromRow( $row, $from );
 175                 return $page;
 176         }
 177
 178         /**
 179          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 180          *
 181          * @param $type object|string|int
 182          * @return mixed
 183          */
 184         private static function convertSelectType( $type ) {
 185                 switch ( $type ) {
 186                 case 'fromdb':
 187                         return self::READ_NORMAL;
 188                 case 'fromdbmaster':
 189                         return self::READ_LATEST;
 190                 case 'forupdate':
 191                         return self::READ_LOCKING;
 192                 default:
 193                         // It may already be an integer or whatever else
 194                         return $type;
 195                 }
 196         }
 197
 198         /**
 199          * Returns overrides for action handlers.
 200          * Classes listed here will be used instead of the default one when
 201          * (and only when) $wgActions[$action] === true. This allows subclasses
 202          * to override the default behavior.
 203          *
 204          * @todo Move this UI stuff somewhere else
 205          *
 206          * @return Array
 207          */
 208         public function getActionOverrides() {
 209                 $content_handler = $this->getContentHandler();
 210                 return $content_handler->getActionOverrides();
 211         }
 212
 213         /**
 214          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 215          *
 216          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 217          *
 218          * @return ContentHandler
 219          *
 220          * @since 1.21
 221          */
 222         public function getContentHandler() {
 223                 return ContentHandler::getForModelID( $this->getContentModel() );
 224         }
 225
 226         /**
 227          * Get the title object of the article
 228          * @return Title object of this page
 229          */
 230         public function getTitle() {
 231                 return $this->mTitle;
 232         }
 233
 234         /**
 235          * Clear the object
 236          * @return void
 237          */
 238         public function clear() {
 239                 $this->mDataLoaded = false;
 240                 $this->mDataLoadedFrom = self::READ_NONE;
 241
 242                 $this->clearCacheFields();
 243         }
 244
 245         /**
 246          * Clear the object cache fields
 247          * @return void
 248          */
 249         protected function clearCacheFields() {
 250                 $this->mId = null;
 251                 $this->mCounter = null;
 252                 $this->mRedirectTarget = null; // Title object if set
 253                 $this->mLastRevision = null; // Latest revision
 254                 $this->mTouched = '19700101000000';
 255                 $this->mLinksUpdated = '19700101000000';
 256                 $this->mTimestamp = '';
 257                 $this->mIsRedirect = false;
 258                 $this->mLatest = false;
 259                 // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 260                 // the requested rev ID and content against the cached one for equality. For most
 261                 // content types, the output should not change during the lifetime of this cache.
 262                 // Clearing it can cause extra parses on edit for no reason.
 263         }
 264
 265         /**
 266          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 267          * @return void
 268          * @since 1.23
 269          */
 270         public function clearPreparedEdit() {
 271                 $this->mPreparedEdit = false;
 272         }
 273
 274         /**
 275          * Return the list of revision fields that should be selected to create
 276          * a new page.
 277          *
 278          * @return array
 279          */
 280         public static function selectFields() {
 281                 global $wgContentHandlerUseDB;
 282
 283                 $fields = array(
 284                         'page_id',
 285                         'page_namespace',
 286                         'page_title',
 287                         'page_restrictions',
 288                         'page_counter',
 289                         'page_is_redirect',
 290                         'page_is_new',
 291                         'page_random',
 292                         'page_touched',
 293                         'page_links_updated',
 294                         'page_latest',
 295                         'page_len',
 296                 );
 297
 298                 if ( $wgContentHandlerUseDB ) {
 299                         $fields[] = 'page_content_model';
 300                 }
 301
 302                 return $fields;
 303         }
 304
 305         /**
 306          * Fetch a page record with the given conditions
 307          * @param $dbr DatabaseBase object
 308          * @param $conditions Array
 309          * @param $options Array
 310          * @return mixed Database result resource, or false on failure
 311          */
 312         protected function pageData( $dbr, $conditions, $options = array() ) {
 313                 $fields = self::selectFields();
 314
 315                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 316
 317                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 318
 319                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 320
 321                 return $row;
 322         }
 323
 324         /**
 325          * Fetch a page record matching the Title object's namespace and title
 326          * using a sanitized title string
 327          *
 328          * @param $dbr DatabaseBase object
 329          * @param $title Title object
 330          * @param $options Array
 331          * @return mixed Database result resource, or false on failure
 332          */
 333         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 334                 return $this->pageData( $dbr, array(
 335                         'page_namespace' => $title->getNamespace(),
 336                         'page_title' => $title->getDBkey() ), $options );
 337         }
 338
 339         /**
 340          * Fetch a page record matching the requested ID
 341          *
 342          * @param $dbr DatabaseBase
 343          * @param $id Integer
 344          * @param $options Array
 345          * @return mixed Database result resource, or false on failure
 346          */
 347         public function pageDataFromId( $dbr, $id, $options = array() ) {
 348                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 349         }
 350
 351         /**
 352          * Set the general counter, title etc data loaded from
 353          * some source.
 354          *
 355          * @param $from object|string|int One of the following:
 356          *        - A DB query result object
 357          *        - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB
 358          *        - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB
 359          *        - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB using SELECT FOR UPDATE
 360          *
 361          * @return void
 362          */
 363         public function loadPageData( $from = 'fromdb' ) {
 364                 $from = self::convertSelectType( $from );
 365                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 366                         // We already have the data from the correct location, no need to load it twice.
 367                         return;
 368                 }
 369
 370                 if ( $from === self::READ_LOCKING ) {
 371                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 372                 } elseif ( $from === self::READ_LATEST ) {
 373                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 374                 } elseif ( $from === self::READ_NORMAL ) {
 375                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 376                         // Use a "last rev inserted" timestamp key to diminish the issue of slave lag.
 377                         // Note that DB also stores the master position in the session and checks it.
 378                         $touched = $this->getCachedLastEditTime();
 379                         if ( $touched ) { // key set
 380                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 381                                         $from = self::READ_LATEST;
 382                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 383                                 }
 384                         }
 385                 } else {
 386                         // No idea from where the caller got this data, assume slave database.
 387                         $data = $from;
 388                         $from = self::READ_NORMAL;
 389                 }
 390
 391                 $this->loadFromRow( $data, $from );
 392         }
 393
 394         /**
 395          * Load the object from a database row
 396          *
 397          * @since 1.20
 398          * @param $data object: database row containing at least fields returned
 399          *        by selectFields()
 400          * @param string|int $from One of the following:
 401          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 402          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 403          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from from
 404          *          the master DB using SELECT FOR UPDATE
 405          */
 406         public function loadFromRow( $data, $from ) {
 407                 $lc = LinkCache::singleton();
 408                 $lc->clearLink( $this->mTitle );
 409
 410                 if ( $data ) {
 411                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 412
 413                         $this->mTitle->loadFromRow( $data );
 414
 415                         // Old-fashioned restrictions
 416                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 417
 418                         $this->mId = intval( $data->page_id );
 419                         $this->mCounter = intval( $data->page_counter );
 420                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 421                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 422                         $this->mIsRedirect = intval( $data->page_is_redirect );
 423                         $this->mLatest = intval( $data->page_latest );
 424                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 425                         // Double-check the ID of any cached latest Revision object for consistency.
 426                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 427                                 $this->mLastRevision = null;
 428                                 $this->mTimestamp = '';
 429                         }
 430                 } else {
 431                         $lc->addBadLinkObj( $this->mTitle );
 432
 433                         $this->mTitle->loadFromRow( false );
 434
 435                         $this->clearCacheFields();
 436
 437                         $this->mId = 0;
 438                 }
 439
 440                 $this->mDataLoaded = true;
 441                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 442         }
 443
 444         /**
 445          * @return int Page ID
 446          */
 447         public function getId() {
 448                 if ( !$this->mDataLoaded ) {
 449                         $this->loadPageData();
 450                 }
 451                 return $this->mId;
 452         }
 453
 454         /**
 455          * @return bool Whether or not the page exists in the database
 456          */
 457         public function exists() {
 458                 if ( !$this->mDataLoaded ) {
 459                         $this->loadPageData();
 460                 }
 461                 return $this->mId > 0;
 462         }
 463
 464         /**
 465          * Check if this page is something we're going to be showing
 466          * some sort of sensible content for. If we return false, page
 467          * views (plain action=view) will return an HTTP 404 response,
 468          * so spiders and robots can know they're following a bad link.
 469          *
 470          * @return bool
 471          */
 472         public function hasViewableContent() {
 473                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 474         }
 475
 476         /**
 477          * @return int The view count for the page
 478          */
 479         public function getCount() {
 480                 if ( !$this->mDataLoaded ) {
 481                         $this->loadPageData();
 482                 }
 483
 484                 return $this->mCounter;
 485         }
 486
 487         /**
 488          * Tests if the article content represents a redirect
 489          *
 490          * @return bool
 491          */
 492         public function isRedirect() {
 493                 $content = $this->getContent();
 494                 if ( !$content ) {
 495                         return false;
 496                 }
 497
 498                 return $content->isRedirect();
 499         }
 500
 501         /**
 502          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 503          *
 504          * Will use the revisions actual content model if the page exists,
 505          * and the page's default if the page doesn't exist yet.
 506          *
 507          * @return String
 508          *
 509          * @since 1.21
 510          */
 511         public function getContentModel() {
 512                 if ( $this->exists() ) {
 513                         // look at the revision's actual content model
 514                         $rev = $this->getRevision();
 515
 516                         if ( $rev !== null ) {
 517                                 return $rev->getContentModel();
 518                         } else {
 519                                 $title = $this->mTitle->getPrefixedDBkey();
 520                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 521                         }
 522                 }
 523
 524                 // use the default model for this page
 525                 return $this->mTitle->getContentModel();
 526         }
 527
 528         /**
 529          * Loads page_touched and returns a value indicating if it should be used
 530          * @return boolean true if not a redirect
 531          */
 532         public function checkTouched() {
 533                 if ( !$this->mDataLoaded ) {
 534                         $this->loadPageData();
 535                 }
 536                 return !$this->mIsRedirect;
 537         }
 538
 539         /**
 540          * Get the page_touched field
 541          * @return string containing GMT timestamp
 542          */
 543         public function getTouched() {
 544                 if ( !$this->mDataLoaded ) {
 545                         $this->loadPageData();
 546                 }
 547                 return $this->mTouched;
 548         }
 549
 550         /**
 551          * Get the page_links_updated field
 552          * @return string|null containing GMT timestamp
 553          */
 554         public function getLinksTimestamp() {
 555                 if ( !$this->mDataLoaded ) {
 556                         $this->loadPageData();
 557                 }
 558                 return $this->mLinksUpdated;
 559         }
 560
 561         /**
 562          * Get the page_latest field
 563          * @return integer rev_id of current revision
 564          */
 565         public function getLatest() {
 566                 if ( !$this->mDataLoaded ) {
 567                         $this->loadPageData();
 568                 }
 569                 return (int)$this->mLatest;
 570         }
 571
 572         /**
 573          * Get the Revision object of the oldest revision
 574          * @return Revision|null
 575          */
 576         public function getOldestRevision() {
 577                 wfProfileIn( __METHOD__ );
 578
 579                 // Try using the slave database first, then try the master
 580                 $continue = 2;
 581                 $db = wfGetDB( DB_SLAVE );
 582                 $revSelectFields = Revision::selectFields();
 583
 584                 $row = null;
 585                 while ( $continue ) {
 586                         $row = $db->selectRow(
 587                                 array( 'page', 'revision' ),
 588                                 $revSelectFields,
 589                                 array(
 590                                         'page_namespace' => $this->mTitle->getNamespace(),
 591                                         'page_title' => $this->mTitle->getDBkey(),
 592                                         'rev_page = page_id'
 593                                 ),
 594                                 __METHOD__,
 595                                 array(
 596                                         'ORDER BY' => 'rev_timestamp ASC'
 597                                 )
 598                         );
 599
 600                         if ( $row ) {
 601                                 $continue = 0;
 602                         } else {
 603                                 $db = wfGetDB( DB_MASTER );
 604                                 $continue--;
 605                         }
 606                 }
 607
 608                 wfProfileOut( __METHOD__ );
 609                 return $row ? Revision::newFromRow( $row ) : null;
 610         }
 611
 612         /**
 613          * Loads everything except the text
 614          * This isn't necessary for all uses, so it's only done if needed.
 615          */
 616         protected function loadLastEdit() {
 617                 if ( $this->mLastRevision !== null ) {
 618                         return; // already loaded
 619                 }
 620
 621                 $latest = $this->getLatest();
 622                 if ( !$latest ) {
 623                         return; // page doesn't exist or is missing page_latest info
 624                 }
 625
 626                 // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always includes the
 627                 // latest changes committed. This is true even within REPEATABLE-READ transactions, where
 628                 // S1 normally only sees changes committed before the first S1 SELECT. Thus we need S1 to
 629                 // also gets the revision row FOR UPDATE; otherwise, it may not find it since a page row
 630                 // UPDATE and revision row INSERT by S2 may have happened after the first S1 SELECT.
 631                 // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 632                 $flags = ( $this->mDataLoadedFrom == self::READ_LOCKING ) ? Revision::READ_LOCKING : 0;
 633                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 634                 if ( $revision ) { // sanity
 635                         $this->setLastEdit( $revision );
 636                 }
 637         }
 638
 639         /**
 640          * Set the latest revision
 641          */
 642         protected function setLastEdit( Revision $revision ) {
 643                 $this->mLastRevision = $revision;
 644                 $this->mTimestamp = $revision->getTimestamp();
 645         }
 646
 647         /**
 648          * Get the latest revision
 649          * @return Revision|null
 650          */
 651         public function getRevision() {
 652                 $this->loadLastEdit();
 653                 if ( $this->mLastRevision ) {
 654                         return $this->mLastRevision;
 655                 }
 656                 return null;
 657         }
 658
 659         /**
 660          * Get the content of the current revision. No side-effects...
 661          *
 662          * @param $audience Integer: one of:
 663          *      Revision::FOR_PUBLIC       to be displayed to all users
 664          *      Revision::FOR_THIS_USER    to be displayed to $wgUser
 665          *      Revision::RAW              get the text regardless of permissions
 666          * @param $user User object to check for, only if FOR_THIS_USER is passed
 667          *              to the $audience parameter
 668          * @return Content|null The content of the current revision
 669          *
 670          * @since 1.21
 671          */
 672         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 673                 $this->loadLastEdit();
 674                 if ( $this->mLastRevision ) {
 675                         return $this->mLastRevision->getContent( $audience, $user );
 676                 }
 677                 return null;
 678         }
 679
 680         /**
 681          * Get the text of the current revision. No side-effects...
 682          *
 683          * @param $audience Integer: one of:
 684          *      Revision::FOR_PUBLIC       to be displayed to all users
 685          *      Revision::FOR_THIS_USER    to be displayed to the given user
 686          *      Revision::RAW              get the text regardless of permissions
 687          * @param $user User object to check for, only if FOR_THIS_USER is passed
 688          *              to the $audience parameter
 689          * @return String|false The text of the current revision
 690          * @deprecated as of 1.21, getContent() should be used instead.
 691          */
 692         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) { // @todo deprecated, replace usage!
 693                 ContentHandler::deprecated( __METHOD__, '1.21' );
 694
 695                 $this->loadLastEdit();
 696                 if ( $this->mLastRevision ) {
 697                         return $this->mLastRevision->getText( $audience, $user );
 698                 }
 699                 return false;
 700         }
 701
 702         /**
 703          * Get the text of the current revision. No side-effects...
 704          *
 705          * @return String|bool The text of the current revision. False on failure
 706          * @deprecated as of 1.21, getContent() should be used instead.
 707          */
 708         public function getRawText() {
 709                 ContentHandler::deprecated( __METHOD__, '1.21' );
 710
 711                 return $this->getText( Revision::RAW );
 712         }
 713
 714         /**
 715          * @return string MW timestamp of last article revision
 716          */
 717         public function getTimestamp() {
 718                 // Check if the field has been filled by WikiPage::setTimestamp()
 719                 if ( !$this->mTimestamp ) {
 720                         $this->loadLastEdit();
 721                 }
 722
 723                 return wfTimestamp( TS_MW, $this->mTimestamp );
 724         }
 725
 726         /**
 727          * Set the page timestamp (use only to avoid DB queries)
 728          * @param string $ts MW timestamp of last article revision
 729          * @return void
 730          */
 731         public function setTimestamp( $ts ) {
 732                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 733         }
 734
 735         /**
 736          * @param $audience Integer: one of:
 737          *      Revision::FOR_PUBLIC       to be displayed to all users
 738          *      Revision::FOR_THIS_USER    to be displayed to the given user
 739          *      Revision::RAW              get the text regardless of permissions
 740          * @param $user User object to check for, only if FOR_THIS_USER is passed
 741          *              to the $audience parameter
 742          * @return int user ID for the user that made the last article revision
 743          */
 744         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 745                 $this->loadLastEdit();
 746                 if ( $this->mLastRevision ) {
 747                         return $this->mLastRevision->getUser( $audience, $user );
 748                 } else {
 749                         return -1;
 750                 }
 751         }
 752
 753         /**
 754          * Get the User object of the user who created the page
 755          * @param $audience Integer: one of:
 756          *      Revision::FOR_PUBLIC       to be displayed to all users
 757          *      Revision::FOR_THIS_USER    to be displayed to the given user
 758          *      Revision::RAW              get the text regardless of permissions
 759          * @param $user User object to check for, only if FOR_THIS_USER is passed
 760          *              to the $audience parameter
 761          * @return User|null
 762          */
 763         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 764                 $revision = $this->getOldestRevision();
 765                 if ( $revision ) {
 766                         $userName = $revision->getUserText( $audience, $user );
 767                         return User::newFromName( $userName, false );
 768                 } else {
 769                         return null;
 770                 }
 771         }
 772
 773         /**
 774          * @param $audience Integer: one of:
 775          *      Revision::FOR_PUBLIC       to be displayed to all users
 776          *      Revision::FOR_THIS_USER    to be displayed to the given user
 777          *      Revision::RAW              get the text regardless of permissions
 778          * @param $user User object to check for, only if FOR_THIS_USER is passed
 779          *              to the $audience parameter
 780          * @return string username of the user that made the last article revision
 781          */
 782         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 783                 $this->loadLastEdit();
 784                 if ( $this->mLastRevision ) {
 785                         return $this->mLastRevision->getUserText( $audience, $user );
 786                 } else {
 787                         return '';
 788                 }
 789         }
 790
 791         /**
 792          * @param $audience Integer: one of:
 793          *      Revision::FOR_PUBLIC       to be displayed to all users
 794          *      Revision::FOR_THIS_USER    to be displayed to the given user
 795          *      Revision::RAW              get the text regardless of permissions
 796          * @param $user User object to check for, only if FOR_THIS_USER is passed
 797          *              to the $audience parameter
 798          * @return string Comment stored for the last article revision
 799          */
 800         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 801                 $this->loadLastEdit();
 802                 if ( $this->mLastRevision ) {
 803                         return $this->mLastRevision->getComment( $audience, $user );
 804                 } else {
 805                         return '';
 806                 }
 807         }
 808
 809         /**
 810          * Returns true if last revision was marked as "minor edit"
 811          *
 812          * @return boolean Minor edit indicator for the last article revision.
 813          */
 814         public function getMinorEdit() {
 815                 $this->loadLastEdit();
 816                 if ( $this->mLastRevision ) {
 817                         return $this->mLastRevision->isMinor();
 818                 } else {
 819                         return false;
 820                 }
 821         }
 822
 823         /**
 824          * Get the cached timestamp for the last time the page changed.
 825          * This is only used to help handle slave lag by comparing to page_touched.
 826          * @return string MW timestamp
 827          */
 828         protected function getCachedLastEditTime() {
 829                 global $wgMemc;
 830                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 831                 return $wgMemc->get( $key );
 832         }
 833
 834         /**
 835          * Set the cached timestamp for the last time the page changed.
 836          * This is only used to help handle slave lag by comparing to page_touched.
 837          * @param $timestamp string
 838          * @return void
 839          */
 840         public function setCachedLastEditTime( $timestamp ) {
 841                 global $wgMemc;
 842                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 843                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60 * 15 );
 844         }
 845
 846         /**
 847          * Determine whether a page would be suitable for being counted as an
 848          * article in the site_stats table based on the title & its content
 849          *
 850          * @param $editInfo Object|bool (false): object returned by prepareTextForEdit(),
 851          *        if false, the current database state will be used
 852          * @return Boolean
 853          */
 854         public function isCountable( $editInfo = false ) {
 855                 global $wgArticleCountMethod;
 856
 857                 if ( !$this->mTitle->isContentPage() ) {
 858                         return false;
 859                 }
 860
 861                 if ( $editInfo ) {
 862                         $content = $editInfo->pstContent;
 863                 } else {
 864                         $content = $this->getContent();
 865                 }
 866
 867                 if ( !$content || $content->isRedirect() ) {
 868                         return false;
 869                 }
 870
 871                 $hasLinks = null;
 872
 873                 if ( $wgArticleCountMethod === 'link' ) {
 874                         // nasty special case to avoid re-parsing to detect links
 875
 876                         if ( $editInfo ) {
 877                                 // ParserOutput::getLinks() is a 2D array of page links, so
 878                                 // to be really correct we would need to recurse in the array
 879                                 // but the main array should only have items in it if there are
 880                                 // links.
 881                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 882                         } else {
 883                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 884                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 885                         }
 886                 }
 887
 888                 return $content->isCountable( $hasLinks );
 889         }
 890
 891         /**
 892          * If this page is a redirect, get its target
 893          *
 894          * The target will be fetched from the redirect table if possible.
 895          * If this page doesn't have an entry there, call insertRedirect()
 896          * @return Title|mixed object, or null if this page is not a redirect
 897          */
 898         public function getRedirectTarget() {
 899                 if ( !$this->mTitle->isRedirect() ) {
 900                         return null;
 901                 }
 902
 903                 if ( $this->mRedirectTarget !== null ) {
 904                         return $this->mRedirectTarget;
 905                 }
 906
 907                 // Query the redirect table
 908                 $dbr = wfGetDB( DB_SLAVE );
 909                 $row = $dbr->selectRow( 'redirect',
 910                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 911                         array( 'rd_from' => $this->getId() ),
 912                         __METHOD__
 913                 );
 914
 915                 // rd_fragment and rd_interwiki were added later, populate them if empty
 916                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 917                         $this->mRedirectTarget = Title::makeTitle(
 918                                 $row->rd_namespace, $row->rd_title,
 919                                 $row->rd_fragment, $row->rd_interwiki );
 920                         return $this->mRedirectTarget;
 921                 }
 922
 923                 // This page doesn't have an entry in the redirect table
 924                 $this->mRedirectTarget = $this->insertRedirect();
 925                 return $this->mRedirectTarget;
 926         }
 927
 928         /**
 929          * Insert an entry for this page into the redirect table.
 930          *
 931          * Don't call this function directly unless you know what you're doing.
 932          * @return Title object or null if not a redirect
 933          */
 934         public function insertRedirect() {
 935                 // recurse through to only get the final target
 936                 $content = $this->getContent();
 937                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 938                 if ( !$retval ) {
 939                         return null;
 940                 }
 941                 $this->insertRedirectEntry( $retval );
 942                 return $retval;
 943         }
 944
 945         /**
 946          * Insert or update the redirect table entry for this page to indicate
 947          * it redirects to $rt .
 948          * @param $rt Title redirect target
 949          */
 950         public function insertRedirectEntry( $rt ) {
 951                 $dbw = wfGetDB( DB_MASTER );
 952                 $dbw->replace( 'redirect', array( 'rd_from' ),
 953                         array(
 954                                 'rd_from' => $this->getId(),
 955                                 'rd_namespace' => $rt->getNamespace(),
 956                                 'rd_title' => $rt->getDBkey(),
 957                                 'rd_fragment' => $rt->getFragment(),
 958                                 'rd_interwiki' => $rt->getInterwiki(),
 959                         ),
 960                         __METHOD__
 961                 );
 962         }
 963
 964         /**
 965          * Get the Title object or URL this page redirects to
 966          *
 967          * @return mixed false, Title of in-wiki target, or string with URL
 968          */
 969         public function followRedirect() {
 970                 return $this->getRedirectURL( $this->getRedirectTarget() );
 971         }
 972
 973         /**
 974          * Get the Title object or URL to use for a redirect. We use Title
 975          * objects for same-wiki, non-special redirects and URLs for everything
 976          * else.
 977          * @param $rt Title Redirect target
 978          * @return mixed false, Title object of local target, or string with URL
 979          */
 980         public function getRedirectURL( $rt ) {
 981                 if ( !$rt ) {
 982                         return false;
 983                 }
 984
 985                 if ( $rt->isExternal() ) {
 986                         if ( $rt->isLocal() ) {
 987                                 // Offsite wikis need an HTTP redirect.
 988                                 //
 989                                 // This can be hard to reverse and may produce loops,
 990                                 // so they may be disabled in the site configuration.
 991                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 992                                 return $rt->getFullURL( array( 'rdfrom' => $source ) );
 993                         } else {
 994                                 // External pages pages without "local" bit set are not valid
 995                                 // redirect targets
 996                                 return false;
 997                         }
 998                 }
 999
1000                 if ( $rt->isSpecialPage() ) {
1001                         // Gotta handle redirects to special pages differently:
1002                         // Fill the HTTP response "Location" header and ignore
1003                         // the rest of the page we're on.
1004                         //
1005                         // Some pages are not valid targets
1006                         if ( $rt->isValidRedirectTarget() ) {
1007                                 return $rt->getFullURL();
1008                         } else {
1009                                 return false;
1010                         }
1011                 }
1012
1013                 return $rt;
1014         }
1015
1016         /**
1017          * Get a list of users who have edited this article, not including the user who made
1018          * the most recent revision, which you can get from $article->getUser() if you want it
1019          * @return UserArrayFromResult
1020          */
1021         public function getContributors() {
1022                 // @todo FIXME: This is expensive; cache this info somewhere.
1023
1024                 $dbr = wfGetDB( DB_SLAVE );
1025
1026                 if ( $dbr->implicitGroupby() ) {
1027                         $realNameField = 'user_real_name';
1028                 } else {
1029                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1030                 }
1031
1032                 $tables = array( 'revision', 'user' );
1033
1034                 $fields = array(
1035                         'user_id' => 'rev_user',
1036                         'user_name' => 'rev_user_text',
1037                         $realNameField,
1038                         'timestamp' => 'MAX(rev_timestamp)',
1039                 );
1040
1041                 $conds = array( 'rev_page' => $this->getId() );
1042
1043                 // The user who made the top revision gets credited as "this page was last edited by
1044                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1045                 $user = $this->getUser();
1046                 if ( $user ) {
1047                         $conds[] = "rev_user != $user";
1048                 } else {
1049                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1050                 }
1051
1052                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
1053
1054                 $jconds = array(
1055                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
1056                 );
1057
1058                 $options = array(
1059                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
1060                         'ORDER BY' => 'timestamp DESC',
1061                 );
1062
1063                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1064                 return new UserArrayFromResult( $res );
1065         }
1066
1067         /**
1068          * Get the last N authors
1069          * @param int $num Number of revisions to get
1070          * @param int|string $revLatest the latest rev_id, selected from the master (optional)
1071          * @return array Array of authors, duplicates not removed
1072          */
1073         public function getLastNAuthors( $num, $revLatest = 0 ) {
1074                 wfProfileIn( __METHOD__ );
1075                 // First try the slave
1076                 // If that doesn't have the latest revision, try the master
1077                 $continue = 2;
1078                 $db = wfGetDB( DB_SLAVE );
1079
1080                 do {
1081                         $res = $db->select( array( 'page', 'revision' ),
1082                                 array( 'rev_id', 'rev_user_text' ),
1083                                 array(
1084                                         'page_namespace' => $this->mTitle->getNamespace(),
1085                                         'page_title' => $this->mTitle->getDBkey(),
1086                                         'rev_page = page_id'
1087                                 ), __METHOD__,
1088                                 array(
1089                                         'ORDER BY' => 'rev_timestamp DESC',
1090                                         'LIMIT' => $num
1091                                 )
1092                         );
1093
1094                         if ( !$res ) {
1095                                 wfProfileOut( __METHOD__ );
1096                                 return array();
1097                         }
1098
1099                         $row = $db->fetchObject( $res );
1100
1101                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1102                                 $db = wfGetDB( DB_MASTER );
1103                                 $continue--;
1104                         } else {
1105                                 $continue = 0;
1106                         }
1107                 } while ( $continue );
1108
1109                 $authors = array( $row->rev_user_text );
1110
1111                 foreach ( $res as $row ) {
1112                         $authors[] = $row->rev_user_text;
1113                 }
1114
1115                 wfProfileOut( __METHOD__ );
1116                 return $authors;
1117         }
1118
1119         /**
1120          * Should the parser cache be used?
1121          *
1122          * @param $parserOptions ParserOptions to check
1123          * @param $oldid int
1124          * @return boolean
1125          */
1126         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1127                 global $wgEnableParserCache;
1128
1129                 return $wgEnableParserCache
1130                         && $parserOptions->getStubThreshold() == 0
1131                         && $this->exists()
1132                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1133                         && $this->getContentHandler()->isParserCacheSupported();
1134         }
1135
1136         /**
1137          * Get a ParserOutput for the given ParserOptions and revision ID.
1138          * The parser cache will be used if possible.
1139          *
1140          * @since 1.19
1141          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1142          * @param null|int $oldid Revision ID to get the text from, passing null or 0 will
1143          *               get the current revision (default value)
1144          *
1145          * @return ParserOutput or false if the revision was not found
1146          */
1147         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1148                 wfProfileIn( __METHOD__ );
1149
1150                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1151                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1152                 if ( $parserOptions->getStubThreshold() ) {
1153                         wfIncrStats( 'pcache_miss_stub' );
1154                 }
1155
1156                 if ( $useParserCache ) {
1157                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1158                         if ( $parserOutput !== false ) {
1159                                 wfProfileOut( __METHOD__ );
1160                                 return $parserOutput;
1161                         }
1162                 }
1163
1164                 if ( $oldid === null || $oldid === 0 ) {
1165                         $oldid = $this->getLatest();
1166                 }
1167
1168                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1169                 $pool->execute();
1170
1171                 wfProfileOut( __METHOD__ );
1172
1173                 return $pool->getParserOutput();
1174         }
1175
1176         /**
1177          * Do standard deferred updates after page view (existing or missing page)
1178          * @param User $user The relevant user
1179          * @param int $oldid The revision id being viewed. If not given or 0, latest revision is assumed.
1180          */
1181         public function doViewUpdates( User $user, $oldid = 0 ) {
1182                 global $wgDisableCounters;
1183                 if ( wfReadOnly() ) {
1184                         return;
1185                 }
1186
1187                 // Don't update page view counters on views from bot users (bug 14044)
1188                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->exists() ) {
1189                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1190                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1191                 }
1192
1193                 // Update newtalk / watchlist notification status
1194                 $user->clearNotification( $this->mTitle, $oldid );
1195         }
1196
1197         /**
1198          * Perform the actions of a page purging
1199          * @return bool
1200          */
1201         public function doPurge() {
1202                 global $wgUseSquid;
1203
1204                 if ( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1205                         return false;
1206                 }
1207
1208                 // Invalidate the cache
1209                 $this->mTitle->invalidateCache();
1210
1211                 if ( $wgUseSquid ) {
1212                         // Commit the transaction before the purge is sent
1213                         $dbw = wfGetDB( DB_MASTER );
1214                         $dbw->commit( __METHOD__ );
1215
1216                         // Send purge
1217                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1218                         $update->doUpdate();
1219                 }
1220
1221                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1222                         // @todo move this logic to MessageCache
1223
1224                         if ( $this->exists() ) {
1225                                 // NOTE: use transclusion text for messages.
1226                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1227
1228                                 $content = $this->getContent();
1229                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1230
1231                                 if ( $text === null ) {
1232                                         $text = false;
1233                                 }
1234                         } else {
1235                                 $text = false;
1236                         }
1237
1238                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1239                 }
1240                 return true;
1241         }
1242
1243         /**
1244          * Insert a new empty page record for this article.
1245          * This *must* be followed up by creating a revision
1246          * and running $this->updateRevisionOn( ... );
1247          * or else the record will be left in a funky state.
1248          * Best if all done inside a transaction.
1249          *
1250          * @param $dbw DatabaseBase
1251          * @return int The newly created page_id key, or false if the title already existed
1252          */
1253         public function insertOn( $dbw ) {
1254                 wfProfileIn( __METHOD__ );
1255
1256                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1257                 $dbw->insert( 'page', array(
1258                         'page_id'           => $page_id,
1259                         'page_namespace'    => $this->mTitle->getNamespace(),
1260                         'page_title'        => $this->mTitle->getDBkey(),
1261                         'page_counter'      => 0,
1262                         'page_restrictions' => '',
1263                         'page_is_redirect'  => 0, // Will set this shortly...
1264                         'page_is_new'       => 1,
1265                         'page_random'       => wfRandom(),
1266                         'page_touched'      => $dbw->timestamp(),
1267                         'page_latest'       => 0, // Fill this in shortly...
1268                         'page_len'          => 0, // Fill this in shortly...
1269                 ), __METHOD__, 'IGNORE' );
1270
1271                 $affected = $dbw->affectedRows();
1272
1273                 if ( $affected ) {
1274                         $newid = $dbw->insertId();
1275                         $this->mId = $newid;
1276                         $this->mTitle->resetArticleID( $newid );
1277                 }
1278                 wfProfileOut( __METHOD__ );
1279
1280                 return $affected ? $newid : false;
1281         }
1282
1283         /**
1284          * Update the page record to point to a newly saved revision.
1285          *
1286          * @param $dbw DatabaseBase: object
1287          * @param $revision Revision: For ID number, and text used to set
1288          *                  length and redirect status fields
1289          * @param $lastRevision Integer: if given, will not overwrite the page field
1290          *                      when different from the currently set value.
1291          *                      Giving 0 indicates the new page flag should be set
1292          *                      on.
1293          * @param $lastRevIsRedirect Boolean: if given, will optimize adding and
1294          *                           removing rows in redirect table.
1295          * @return bool true on success, false on failure
1296          * @private
1297          */
1298         public function updateRevisionOn( $dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1299                 global $wgContentHandlerUseDB;
1300
1301                 wfProfileIn( __METHOD__ );
1302
1303                 $content = $revision->getContent();
1304                 $len = $content ? $content->getSize() : 0;
1305                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1306
1307                 $conditions = array( 'page_id' => $this->getId() );
1308
1309                 if ( !is_null( $lastRevision ) ) {
1310                         // An extra check against threads stepping on each other
1311                         $conditions['page_latest'] = $lastRevision;
1312                 }
1313
1314                 $now = wfTimestampNow();
1315                 $row = array( /* SET */
1316                         'page_latest'      => $revision->getId(),
1317                         'page_touched'     => $dbw->timestamp( $now ),
1318                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1319                         'page_is_redirect' => $rt !== null ? 1 : 0,
1320                         'page_len'         => $len,
1321                 );
1322
1323                 if ( $wgContentHandlerUseDB ) {
1324                         $row['page_content_model'] = $revision->getContentModel();
1325                 }
1326
1327                 $dbw->update( 'page',
1328                         $row,
1329                         $conditions,
1330                         __METHOD__ );
1331
1332                 $result = $dbw->affectedRows() > 0;
1333                 if ( $result ) {
1334                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1335                         $this->setLastEdit( $revision );
1336                         $this->setCachedLastEditTime( $now );
1337                         $this->mLatest = $revision->getId();
1338                         $this->mIsRedirect = (bool)$rt;
1339                         // Update the LinkCache.
1340                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect,
1341                                                                                                         $this->mLatest, $revision->getContentModel() );
1342                 }
1343
1344                 wfProfileOut( __METHOD__ );
1345                 return $result;
1346         }
1347
1348         /**
1349          * Add row to the redirect table if this is a redirect, remove otherwise.
1350          *
1351          * @param $dbw DatabaseBase
1352          * @param $redirectTitle Title object pointing to the redirect target,
1353          *                       or NULL if this is not a redirect
1354          * @param $lastRevIsRedirect null|bool If given, will optimize adding and
1355          *                           removing rows in redirect table.
1356          * @return bool true on success, false on failure
1357          * @private
1358          */
1359         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1360                 // Always update redirects (target link might have changed)
1361                 // Update/Insert if we don't know if the last revision was a redirect or not
1362                 // Delete if changing from redirect to non-redirect
1363                 $isRedirect = !is_null( $redirectTitle );
1364
1365                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1366                         return true;
1367                 }
1368
1369                 wfProfileIn( __METHOD__ );
1370                 if ( $isRedirect ) {
1371                         $this->insertRedirectEntry( $redirectTitle );
1372                 } else {
1373                         // This is not a redirect, remove row from redirect table
1374                         $where = array( 'rd_from' => $this->getId() );
1375                         $dbw->delete( 'redirect', $where, __METHOD__ );
1376                 }
1377
1378                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1379                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1380                 }
1381                 wfProfileOut( __METHOD__ );
1382
1383                 return ( $dbw->affectedRows() != 0 );
1384         }
1385
1386         /**
1387          * If the given revision is newer than the currently set page_latest,
1388          * update the page record. Otherwise, do nothing.
1389          *
1390          * @param $dbw DatabaseBase object
1391          * @param $revision Revision object
1392          * @return mixed
1393          */
1394         public function updateIfNewerOn( $dbw, $revision ) {
1395                 wfProfileIn( __METHOD__ );
1396
1397                 $row = $dbw->selectRow(
1398                         array( 'revision', 'page' ),
1399                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1400                         array(
1401                                 'page_id' => $this->getId(),
1402                                 'page_latest=rev_id' ),
1403                         __METHOD__ );
1404
1405                 if ( $row ) {
1406                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1407                                 wfProfileOut( __METHOD__ );
1408                                 return false;
1409                         }
1410                         $prev = $row->rev_id;
1411                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1412                 } else {
1413                         // No or missing previous revision; mark the page as new
1414                         $prev = 0;
1415                         $lastRevIsRedirect = null;
1416                 }
1417
1418                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1419
1420                 wfProfileOut( __METHOD__ );
1421                 return $ret;
1422         }
1423
1424         /**
1425          * Get the content that needs to be saved in order to undo all revisions
1426          * between $undo and $undoafter. Revisions must belong to the same page,
1427          * must exist and must not be deleted
1428          * @param $undo Revision
1429          * @param $undoafter Revision Must be an earlier revision than $undo
1430          * @return mixed string on success, false on failure
1431          * @since 1.21
1432          * Before we had the Content object, this was done in getUndoText
1433          */
1434         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1435                 $handler = $undo->getContentHandler();
1436                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1437         }
1438
1439         /**
1440          * Get the text that needs to be saved in order to undo all revisions
1441          * between $undo and $undoafter. Revisions must belong to the same page,
1442          * must exist and must not be deleted
1443          * @param $undo Revision
1444          * @param $undoafter Revision Must be an earlier revision than $undo
1445          * @return mixed string on success, false on failure
1446          * @deprecated since 1.21: use ContentHandler::getUndoContent() instead.
1447          */
1448         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1449                 ContentHandler::deprecated( __METHOD__, '1.21' );
1450
1451                 $this->loadLastEdit();
1452
1453                 if ( $this->mLastRevision ) {
1454                         if ( is_null( $undoafter ) ) {
1455                                 $undoafter = $undo->getPrevious();
1456                         }
1457
1458                         $handler = $this->getContentHandler();
1459                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1460
1461                         if ( !$undone ) {
1462                                 return false;
1463                         } else {
1464                                 return ContentHandler::getContentText( $undone );
1465                         }
1466                 }
1467
1468                 return false;
1469         }
1470
1471         /**
1472          * @param mixed $section Null/false, a section number (0, 1, 2, T1, T2, ...) or "new".
1473          * @param string $text New text of the section.
1474          * @param string $sectionTitle New section's subject, only if $section is "new".
1475          * @param string $edittime Revision timestamp or null to use the current revision.
1476          *
1477          * @throws MWException
1478          * @return string New complete article text, or null if error.
1479          *
1480          * @deprecated since 1.21, use replaceSectionContent() instead
1481          */
1482         public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
1483                 ContentHandler::deprecated( __METHOD__, '1.21' );
1484
1485                 if ( strval( $section ) == '' ) { //NOTE: keep condition in sync with condition in replaceSectionContent!
1486                         // Whole-page edit; let the whole text through
1487                         return $text;
1488                 }
1489
1490                 if ( !$this->supportsSections() ) {
1491                         throw new MWException( "sections not supported for content model " .
1492                                 $this->getContentHandler()->getModelID() );
1493                 }
1494
1495                 // could even make section title, but that's not required.
1496                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() );
1497
1498                 $newContent = $this->replaceSectionContent( $section, $sectionContent, $sectionTitle,
1499                         $edittime );
1500
1501                 return ContentHandler::getContentText( $newContent );
1502         }
1503
1504         /**
1505          * Returns true if this page's content model supports sections.
1506          *
1507          * @return bool
1508          *
1509          * @todo The skin should check this and not offer section functionality if sections are not supported.
1510          * @todo The EditPage should check this and not offer section functionality if sections are not supported.
1511          */
1512         public function supportsSections() {
1513                 return $this->getContentHandler()->supportsSections();
1514         }
1515
1516         /**
1517          * @param mixed $section Null/false, a section number (0, 1, 2, T1, T2, ...) or "new".
1518          * @param Content $sectionContent New content of the section.
1519          * @param string $sectionTitle New section's subject, only if $section is "new".
1520          * @param string $edittime Revision timestamp or null to use the current revision.
1521          *
1522          * @throws MWException
1523          * @return Content New complete article content, or null if error.
1524          *
1525          * @since 1.21
1526          */
1527         public function replaceSectionContent( $section, Content $sectionContent, $sectionTitle = '',
1528                 $edittime = null ) {
1529                 wfProfileIn( __METHOD__ );
1530
1531                 if ( strval( $section ) == '' ) {
1532                         // Whole-page edit; let the whole text through
1533                         $newContent = $sectionContent;
1534                 } else {
1535                         if ( !$this->supportsSections() ) {
1536                                 wfProfileOut( __METHOD__ );
1537                                 throw new MWException( "sections not supported for content model " .
1538                                         $this->getContentHandler()->getModelID() );
1539                         }
1540
1541                         // Bug 30711: always use current version when adding a new section
1542                         if ( is_null( $edittime ) || $section == 'new' ) {
1543                                 $oldContent = $this->getContent();
1544                         } else {
1545                                 $dbw = wfGetDB( DB_MASTER );
1546                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1547
1548                                 if ( !$rev ) {
1549                                         wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
1550                                                 $this->getId() . "; section: $section; edittime: $edittime)\n" );
1551                                         wfProfileOut( __METHOD__ );
1552                                         return null;
1553                                 }
1554
1555                                 $oldContent = $rev->getContent();
1556                         }
1557
1558                         if ( ! $oldContent ) {
1559                                 wfDebug( __METHOD__ . ": no page text\n" );
1560                                 wfProfileOut( __METHOD__ );
1561                                 return null;
1562                         }
1563
1564                         // FIXME: $oldContent might be null?
1565                         $newContent = $oldContent->replaceSection( $section, $sectionContent, $sectionTitle );
1566                 }
1567
1568                 wfProfileOut( __METHOD__ );
1569                 return $newContent;
1570         }
1571
1572         /**
1573          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1574          * @param $flags Int
1575          * @return Int updated $flags
1576          */
1577         public function checkFlags( $flags ) {
1578                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1579                         if ( $this->exists() ) {
1580                                 $flags |= EDIT_UPDATE;
1581                         } else {
1582                                 $flags |= EDIT_NEW;
1583                         }
1584                 }
1585
1586                 return $flags;
1587         }
1588
1589         /**
1590          * Change an existing article or create a new article. Updates RC and all necessary caches,
1591          * optionally via the deferred update array.
1592          *
1593          * @param string $text new text
1594          * @param string $summary edit summary
1595          * @param $flags Integer bitfield:
1596          *      EDIT_NEW
1597          *          Article is known or assumed to be non-existent, create a new one
1598          *      EDIT_UPDATE
1599          *          Article is known or assumed to be pre-existing, update it
1600          *      EDIT_MINOR
1601          *          Mark this edit minor, if the user is allowed to do so
1602          *      EDIT_SUPPRESS_RC
1603          *          Do not log the change in recentchanges
1604          *      EDIT_FORCE_BOT
1605          *          Mark the edit a "bot" edit regardless of user rights
1606          *      EDIT_DEFER_UPDATES
1607          *          Defer some of the updates until the end of index.php
1608          *      EDIT_AUTOSUMMARY
1609          *          Fill in blank summaries with generated text where possible
1610          *
1611          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1612          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1613          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1614          * edit-already-exists error will be returned. These two conditions are also possible with
1615          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1616          *
1617          * @param bool|int $baseRevId int the revision ID this edit was based off, if any
1618          * @param $user User the user doing the edit
1619          *
1620          * @throws MWException
1621          * @return Status object. Possible errors:
1622          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1623          *     edit-gone-missing:       In update mode, but the article didn't exist
1624          *     edit-conflict:           In update mode, the article changed unexpectedly
1625          *     edit-no-change:          Warning that the text was the same as before
1626          *     edit-already-exists:     In creation mode, but the article already exists
1627          *
1628          *  Extensions may define additional errors.
1629          *
1630          *  $return->value will contain an associative array with members as follows:
1631          *     new:                     Boolean indicating if the function attempted to create a new article
1632          *     revision:                The revision object for the inserted revision, or null
1633          *
1634          *  Compatibility note: this function previously returned a boolean value indicating success/failure
1635          *
1636          * @deprecated since 1.21: use doEditContent() instead.
1637          */
1638         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1639                 ContentHandler::deprecated( __METHOD__, '1.21' );
1640
1641                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1642
1643                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1644         }
1645
1646         /**
1647          * Change an existing article or create a new article. Updates RC and all necessary caches,
1648          * optionally via the deferred update array.
1649          *
1650          * @param $content Content: new content
1651          * @param string $summary edit summary
1652          * @param $flags Integer bitfield:
1653          *      EDIT_NEW
1654          *          Article is known or assumed to be non-existent, create a new one
1655          *      EDIT_UPDATE
1656          *          Article is known or assumed to be pre-existing, update it
1657          *      EDIT_MINOR
1658          *          Mark this edit minor, if the user is allowed to do so
1659          *      EDIT_SUPPRESS_RC
1660          *          Do not log the change in recentchanges
1661          *      EDIT_FORCE_BOT
1662          *          Mark the edit a "bot" edit regardless of user rights
1663          *      EDIT_DEFER_UPDATES
1664          *          Defer some of the updates until the end of index.php
1665          *      EDIT_AUTOSUMMARY
1666          *          Fill in blank summaries with generated text where possible
1667          *
1668          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1669          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return an
1670          * edit-gone-missing error. If EDIT_NEW is specified and the article does exist, an
1671          * edit-already-exists error will be returned. These two conditions are also possible with
1672          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1673          *
1674          * @param bool|int $baseRevId the revision ID this edit was based off, if any
1675          * @param $user User the user doing the edit
1676          * @param $serialisation_format String: format for storing the content in the database
1677          *
1678          * @throws MWException
1679          * @return Status object. Possible errors:
1680          *     edit-hook-aborted:       The ArticleSave hook aborted the edit but didn't set the fatal flag of $status
1681          *     edit-gone-missing:       In update mode, but the article didn't exist
1682          *     edit-conflict:           In update mode, the article changed unexpectedly
1683          *     edit-no-change:          Warning that the text was the same as before
1684          *     edit-already-exists:     In creation mode, but the article already exists
1685          *
1686          *  Extensions may define additional errors.
1687          *
1688          *  $return->value will contain an associative array with members as follows:
1689          *     new:                     Boolean indicating if the function attempted to create a new article
1690          *     revision:                The revision object for the inserted revision, or null
1691          *
1692          * @since 1.21
1693          */
1694         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1695                 User $user = null, $serialisation_format = null
1696         ) {
1697                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1698
1699                 // Low-level sanity check
1700                 if ( $this->mTitle->getText() === '' ) {
1701                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1702                 }
1703
1704                 wfProfileIn( __METHOD__ );
1705
1706                 if ( !$content->getContentHandler()->canBeUsedOn( $this->getTitle() ) ) {
1707                         wfProfileOut( __METHOD__ );
1708                         return Status::newFatal( 'content-not-allowed-here',
1709                                 ContentHandler::getLocalizedName( $content->getModel() ),
1710                                 $this->getTitle()->getPrefixedText() );
1711                 }
1712
1713                 $user = is_null( $user ) ? $wgUser : $user;
1714                 $status = Status::newGood( array() );
1715
1716                 // Load the data from the master database if needed.
1717                 // The caller may already loaded it from the master or even loaded it using
1718                 // SELECT FOR UPDATE, so do not override that using clear().
1719                 $this->loadPageData( 'fromdbmaster' );
1720
1721                 $flags = $this->checkFlags( $flags );
1722
1723                 // handle hook
1724                 $hook_args = array( &$this, &$user, &$content, &$summary,
1725                                                         $flags & EDIT_MINOR, null, null, &$flags, &$status );
1726
1727                 if ( !wfRunHooks( 'PageContentSave', $hook_args )
1728                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args ) ) {
1729
1730                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1731
1732                         if ( $status->isOK() ) {
1733                                 $status->fatal( 'edit-hook-aborted' );
1734                         }
1735
1736                         wfProfileOut( __METHOD__ );
1737                         return $status;
1738                 }
1739
1740                 // Silently ignore EDIT_MINOR if not allowed
1741                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1742                 $bot = $flags & EDIT_FORCE_BOT;
1743
1744                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1745
1746                 $oldsize = $old_content ? $old_content->getSize() : 0;
1747                 $oldid = $this->getLatest();
1748                 $oldIsRedirect = $this->isRedirect();
1749                 $oldcountable = $this->isCountable();
1750
1751                 $handler = $content->getContentHandler();
1752
1753                 // Provide autosummaries if one is not provided and autosummaries are enabled.
1754                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1755                         if ( !$old_content ) {
1756                                 $old_content = null;
1757                         }
1758                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1759                 }
1760
1761                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1762                 $serialized = $editInfo->pst;
1763
1764                 /**
1765                  * @var Content $content
1766                  */
1767                 $content = $editInfo->pstContent;
1768                 $newsize = $content->getSize();
1769
1770                 $dbw = wfGetDB( DB_MASTER );
1771                 $now = wfTimestampNow();
1772                 $this->mTimestamp = $now;
1773
1774                 if ( $flags & EDIT_UPDATE ) {
1775                         // Update article, but only if changed.
1776                         $status->value['new'] = false;
1777
1778                         if ( !$oldid ) {
1779                                 // Article gone missing
1780                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1781                                 $status->fatal( 'edit-gone-missing' );
1782
1783                                 wfProfileOut( __METHOD__ );
1784                                 return $status;
1785                         } elseif ( !$old_content ) {
1786                                 // Sanity check for bug 37225
1787                                 wfProfileOut( __METHOD__ );
1788                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1789                         }
1790
1791                         $revision = new Revision( array(
1792                                 'page'       => $this->getId(),
1793                                 'title'      => $this->getTitle(), // for determining the default content model
1794                                 'comment'    => $summary,
1795                                 'minor_edit' => $isminor,
1796                                 'text'       => $serialized,
1797                                 'len'        => $newsize,
1798                                 'parent_id'  => $oldid,
1799                                 'user'       => $user->getId(),
1800                                 'user_text'  => $user->getName(),
1801                                 'timestamp'  => $now,
1802                                 'content_model' => $content->getModel(),
1803                                 'content_format' => $serialisation_format,
1804                         ) ); // XXX: pass content object?!
1805
1806                         $changed = !$content->equals( $old_content );
1807
1808                         if ( $changed ) {
1809                                 if ( !$content->isValid() ) {
1810                                         wfProfileOut( __METHOD__ );
1811                                         throw new MWException( "New content failed validity check!" );
1812                                 }
1813
1814                                 $dbw->begin( __METHOD__ );
1815
1816                                 $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1817                                 $status->merge( $prepStatus );
1818
1819                                 if ( !$status->isOK() ) {
1820                                         $dbw->rollback( __METHOD__ );
1821
1822                                         wfProfileOut( __METHOD__ );
1823                                         return $status;
1824                                 }
1825
1826                                 $revisionId = $revision->insertOn( $dbw );
1827
1828                                 // Update page
1829                                 //
1830                                 // Note that we use $this->mLatest instead of fetching a value from the master DB
1831                                 // during the course of this function. This makes sure that EditPage can detect
1832                                 // edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
1833                                 // before this function is called. A previous function used a separate query, this
1834                                 // creates a window where concurrent edits can cause an ignored edit conflict.
1835                                 $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1836
1837                                 if ( !$ok ) {
1838                                         // Belated edit conflict! Run away!!
1839                                         $status->fatal( 'edit-conflict' );
1840
1841                                         $dbw->rollback( __METHOD__ );
1842
1843                                         wfProfileOut( __METHOD__ );
1844                                         return $status;
1845                                 }
1846
1847                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1848                                 // Update recentchanges
1849                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1850                                         // Mark as patrolled if the user can do so
1851                                         $patrolled = $wgUseRCPatrol && !count(
1852                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1853                                         // Add RC row to the DB
1854                                         $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1855                                                 $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1856                                                 $revisionId, $patrolled
1857                                         );
1858
1859                                         // Log auto-patrolled edits
1860                                         if ( $patrolled ) {
1861                                                 PatrolLog::record( $rc, true, $user );
1862                                         }
1863                                 }
1864                                 $user->incEditCount();
1865                                 $dbw->commit( __METHOD__ );
1866                         } else {
1867                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1868                                 // related variables correctly
1869                                 $revision->setId( $this->getLatest() );
1870                         }
1871
1872                         // Update links tables, site stats, etc.
1873                         $this->doEditUpdates(
1874                                 $revision,
1875                                 $user,
1876                                 array(
1877                                         'changed' => $changed,
1878                                         'oldcountable' => $oldcountable
1879                                 )
1880                         );
1881
1882                         if ( !$changed ) {
1883                                 $status->warning( 'edit-no-change' );
1884                                 $revision = null;
1885                                 // Update page_touched, this is usually implicit in the page update
1886                                 // Other cache updates are done in onArticleEdit()
1887                                 $this->mTitle->invalidateCache();
1888                         }
1889                 } else {
1890                         // Create new article
1891                         $status->value['new'] = true;
1892
1893                         $dbw->begin( __METHOD__ );
1894
1895                         $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1896                         $status->merge( $prepStatus );
1897
1898                         if ( !$status->isOK() ) {
1899                                 $dbw->rollback( __METHOD__ );
1900
1901                                 wfProfileOut( __METHOD__ );
1902                                 return $status;
1903                         }
1904
1905                         $status->merge( $prepStatus );
1906
1907                         // Add the page record; stake our claim on this title!
1908                         // This will return false if the article already exists
1909                         $newid = $this->insertOn( $dbw );
1910
1911                         if ( $newid === false ) {
1912                                 $dbw->rollback( __METHOD__ );
1913                                 $status->fatal( 'edit-already-exists' );
1914
1915                                 wfProfileOut( __METHOD__ );
1916                                 return $status;
1917                         }
1918
1919                         // Save the revision text...
1920                         $revision = new Revision( array(
1921                                 'page'       => $newid,
1922                                 'title'      => $this->getTitle(), // for determining the default content model
1923                                 'comment'    => $summary,
1924                                 'minor_edit' => $isminor,
1925                                 'text'       => $serialized,
1926                                 'len'        => $newsize,
1927                                 'user'       => $user->getId(),
1928                                 'user_text'  => $user->getName(),
1929                                 'timestamp'  => $now,
1930                                 'content_model' => $content->getModel(),
1931                                 'content_format' => $serialisation_format,
1932                         ) );
1933                         $revisionId = $revision->insertOn( $dbw );
1934
1935                         // Bug 37225: use accessor to get the text as Revision may trim it
1936                         $content = $revision->getContent(); // sanity; get normalized version
1937
1938                         if ( $content ) {
1939                                 $newsize = $content->getSize();
1940                         }
1941
1942                         // Update the page record with revision data
1943                         $this->updateRevisionOn( $dbw, $revision, 0 );
1944
1945                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1946
1947                         // Update recentchanges
1948                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1949                                 // Mark as patrolled if the user can do so
1950                                 $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1951                                         $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1952                                 // Add RC row to the DB
1953                                 $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1954                                         '', $newsize, $revisionId, $patrolled );
1955
1956                                 // Log auto-patrolled edits
1957                                 if ( $patrolled ) {
1958                                         PatrolLog::record( $rc, true, $user );
1959                                 }
1960                         }
1961                         $user->incEditCount();
1962                         $dbw->commit( __METHOD__ );
1963
1964                         // Update links, etc.
1965                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1966
1967                         $hook_args = array( &$this, &$user, $content, $summary,
1968                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision );
1969
1970                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $hook_args );
1971                         wfRunHooks( 'PageContentInsertComplete', $hook_args );
1972                 }
1973
1974                 // Do updates right now unless deferral was requested
1975                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
1976                         DeferredUpdates::doUpdates();
1977                 }
1978
1979                 // Return the new revision (or null) to the caller
1980                 $status->value['revision'] = $revision;
1981
1982                 $hook_args = array( &$this, &$user, $content, $summary,
1983                                                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId );
1984
1985                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $hook_args );
1986                 wfRunHooks( 'PageContentSaveComplete', $hook_args );
1987
1988                 // Promote user to any groups they meet the criteria for
1989                 $user->addAutopromoteOnceGroups( 'onEdit' );
1990
1991                 wfProfileOut( __METHOD__ );
1992                 return $status;
1993         }
1994
1995         /**
1996          * Get parser options suitable for rendering the primary article wikitext
1997          *
1998          * @see ContentHandler::makeParserOptions
1999          *
2000          * @param IContextSource|User|string $context One of the following:
2001          *        - IContextSource: Use the User and the Language of the provided
2002          *          context
2003          *        - User: Use the provided User object and $wgLang for the language,
2004          *          so use an IContextSource object if possible.
2005          *        - 'canonical': Canonical options (anonymous user with default
2006          *          preferences and content language).
2007          * @return ParserOptions
2008          */
2009         public function makeParserOptions( $context ) {
2010                 $options = $this->getContentHandler()->makeParserOptions( $context );
2011
2012                 if ( $this->getTitle()->isConversionTable() ) {
2013                         // @todo ConversionTable should become a separate content model, so we don't need special cases like this one.
2014                         $options->disableContentConversion();
2015                 }
2016
2017                 return $options;
2018         }
2019
2020         /**
2021          * Prepare text which is about to be saved.
2022          * Returns a stdclass with source, pst and output members
2023          *
2024          * @deprecated in 1.21: use prepareContentForEdit instead.
2025          */
2026         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2027                 ContentHandler::deprecated( __METHOD__, '1.21' );
2028                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2029                 return $this->prepareContentForEdit( $content, $revid, $user );
2030         }
2031
2032         /**
2033          * Prepare content which is about to be saved.
2034          * Returns a stdclass with source, pst and output members
2035          *
2036          * @param Content $content
2037          * @param int|null $revid
2038          * @param User|null $user
2039          * @param string|null $serialization_format
2040          *
2041          * @return bool|object
2042          *
2043          * @since 1.21
2044          */
2045         public function prepareContentForEdit( Content $content, $revid = null, User $user = null,
2046                 $serialization_format = null
2047         ) {
2048                 global $wgContLang, $wgUser;
2049                 $user = is_null( $user ) ? $wgUser : $user;
2050                 //XXX: check $user->getId() here???
2051
2052                 // Use a sane default for $serialization_format, see bug 57026
2053                 if ( $serialization_format === null ) {
2054                         $serialization_format = $content->getContentHandler()->getDefaultFormat();
2055                 }
2056
2057                 if ( $this->mPreparedEdit
2058                         && $this->mPreparedEdit->newContent
2059                         && $this->mPreparedEdit->newContent->equals( $content )
2060                         && $this->mPreparedEdit->revid == $revid
2061                         && $this->mPreparedEdit->format == $serialization_format
2062                         // XXX: also check $user here?
2063                 ) {
2064                         // Already prepared
2065                         return $this->mPreparedEdit;
2066                 }
2067
2068                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2069                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
2070
2071                 $edit = (object)array();
2072                 $edit->revid = $revid;
2073                 $edit->timestamp = wfTimestampNow();
2074
2075                 $edit->pstContent = $content ? $content->preSaveTransform( $this->mTitle, $user, $popts ) : null;
2076
2077                 $edit->format = $serialization_format;
2078                 $edit->popts = $this->makeParserOptions( 'canonical' );
2079                 $edit->output = $edit->pstContent ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts ) : null;
2080
2081                 $edit->newContent = $content;
2082                 $edit->oldContent = $this->getContent( Revision::RAW );
2083
2084                 // NOTE: B/C for hooks! don't use these fields!
2085                 $edit->newText = $edit->newContent ? ContentHandler::getContentText( $edit->newContent ) : '';
2086                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
2087                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialization_format ) : '';
2088
2089                 $this->mPreparedEdit = $edit;
2090                 return $edit;
2091         }
2092
2093         /**
2094          * Do standard deferred updates after page edit.
2095          * Update links tables, site stats, search index and message cache.
2096          * Purges pages that include this page if the text was changed here.
2097          * Every 100th edit, prune the recent changes table.
2098          *
2099          * @param $revision Revision object
2100          * @param $user User object that did the revision
2101          * @param array $options of options, following indexes are used:
2102          * - changed: boolean, whether the revision changed the content (default true)
2103          * - created: boolean, whether the revision created the page (default false)
2104          * - oldcountable: boolean or null (default null):
2105          *   - boolean: whether the page was counted as an article before that
2106          *     revision, only used in changed is true and created is false
2107          *   - null: don't change the article count
2108          */
2109         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2110                 global $wgEnableParserCache;
2111
2112                 wfProfileIn( __METHOD__ );
2113
2114                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2115                 $content = $revision->getContent();
2116
2117                 // Parse the text
2118                 // Be careful not to do pre-save transform twice: $text is usually
2119                 // already pre-save transformed once.
2120                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2121                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2122                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
2123                 } else {
2124                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2125                         $editInfo = $this->mPreparedEdit;
2126                 }
2127
2128                 // Save it to the parser cache
2129                 if ( $wgEnableParserCache ) {
2130                         $parserCache = ParserCache::singleton();
2131                         $parserCache->save(
2132                                 $editInfo->output, $this, $editInfo->popts, $editInfo->timestamp, $editInfo->revid
2133                         );
2134                 }
2135
2136                 // Update the links tables and other secondary data
2137                 if ( $content ) {
2138                         $recursive = $options['changed']; // bug 50785
2139                         $updates = $content->getSecondaryDataUpdates(
2140                                 $this->getTitle(), null, $recursive, $editInfo->output );
2141                         DataUpdate::runUpdates( $updates );
2142                 }
2143
2144                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2145
2146                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2147                         if ( 0 == mt_rand( 0, 99 ) ) {
2148                                 // Flush old entries from the `recentchanges` table; we do this on
2149                                 // random requests so as to avoid an increase in writes for no good reason
2150                                 RecentChange::purgeExpiredChanges();
2151                         }
2152                 }
2153
2154                 if ( !$this->exists() ) {
2155                         wfProfileOut( __METHOD__ );
2156                         return;
2157                 }
2158
2159                 $id = $this->getId();
2160                 $title = $this->mTitle->getPrefixedDBkey();
2161                 $shortTitle = $this->mTitle->getDBkey();
2162
2163                 if ( !$options['changed'] ) {
2164                         $good = 0;
2165                         $total = 0;
2166                 } elseif ( $options['created'] ) {
2167                         $good = (int)$this->isCountable( $editInfo );
2168                         $total = 1;
2169                 } elseif ( $options['oldcountable'] !== null ) {
2170                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2171                         $total = 0;
2172                 } else {
2173                         $good = 0;
2174                         $total = 0;
2175                 }
2176
2177                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
2178                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2179
2180                 // If this is another user's talk page, update newtalk.
2181                 // Don't do this if $options['changed'] = false (null-edits) nor if
2182                 // it's a minor edit and the user doesn't want notifications for those.
2183                 if ( $options['changed']
2184                         && $this->mTitle->getNamespace() == NS_USER_TALK
2185                         && $shortTitle != $user->getTitleKey()
2186                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2187                 ) {
2188                         $recipient = User::newFromName( $shortTitle, false );
2189                         if ( !$recipient ) {
2190                                 wfDebug( __METHOD__ . ": invalid username\n" );
2191                         } else {
2192                                 // Allow extensions to prevent user notification when a new message is added to their talk page
2193                                 if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this, $recipient ) ) ) {
2194                                         if ( User::isIP( $shortTitle ) ) {
2195                                                 // An anonymous user
2196                                                 $recipient->setNewtalk( true, $revision );
2197                                         } elseif ( $recipient->isLoggedIn() ) {
2198                                                 $recipient->setNewtalk( true, $revision );
2199                                         } else {
2200                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2201                                         }
2202                                 }
2203                         }
2204                 }
2205
2206                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2207                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2208                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2209                         if ( $msgtext === false || $msgtext === null ) {
2210                                 $msgtext = '';
2211                         }
2212
2213                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2214                 }
2215
2216                 if ( $options['created'] ) {
2217                         self::onArticleCreate( $this->mTitle );
2218                 } else {
2219                         self::onArticleEdit( $this->mTitle );
2220                 }
2221
2222                 wfProfileOut( __METHOD__ );
2223         }
2224
2225         /**
2226          * Edit an article without doing all that other stuff
2227          * The article must already exist; link tables etc
2228          * are not updated, caches are not flushed.
2229          *
2230          * @param string $text text submitted
2231          * @param $user User The relevant user
2232          * @param string $comment comment submitted
2233          * @param $minor Boolean: whereas it's a minor modification
2234          *
2235          * @deprecated since 1.21, use doEditContent() instead.
2236          */
2237         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2238                 ContentHandler::deprecated( __METHOD__, "1.21" );
2239
2240                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2241                 $this->doQuickEditContent( $content, $user, $comment, $minor );
2242         }
2243
2244         /**
2245          * Edit an article without doing all that other stuff
2246          * The article must already exist; link tables etc
2247          * are not updated, caches are not flushed.
2248          *
2249          * @param Content $content Content submitted
2250          * @param User $user The relevant user
2251          * @param string $comment comment submitted
2252          * @param string $serialisation_format Format for storing the content in the database
2253          * @param bool $minor Whereas it's a minor modification
2254          */
2255         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = false,
2256                 $serialisation_format = null
2257         ) {
2258                 wfProfileIn( __METHOD__ );
2259
2260                 $serialized = $content->serialize( $serialisation_format );
2261
2262                 $dbw = wfGetDB( DB_MASTER );
2263                 $revision = new Revision( array(
2264                         'title'      => $this->getTitle(), // for determining the default content model
2265                         'page'       => $this->getId(),
2266                         'text'       => $serialized,
2267                         'length'     => $content->getSize(),
2268                         'comment'    => $comment,
2269                         'minor_edit' => $minor ? 1 : 0,
2270                 ) ); // XXX: set the content object?
2271                 $revision->insertOn( $dbw );
2272                 $this->updateRevisionOn( $dbw, $revision );
2273
2274                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2275
2276                 wfProfileOut( __METHOD__ );
2277         }
2278
2279         /**
2280          * Update the article's restriction field, and leave a log entry.
2281          * This works for protection both existing and non-existing pages.
2282          *
2283          * @param array $limit set of restriction keys
2284          * @param array $expiry per restriction type expiration
2285          * @param int &$cascade Set to false if cascading protection isn't allowed.
2286          * @param string $reason
2287          * @param User $user The user updating the restrictions
2288          * @return Status
2289          */
2290         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
2291                 global $wgCascadingRestrictionLevels, $wgContLang;
2292
2293                 if ( wfReadOnly() ) {
2294                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2295                 }
2296
2297                 $this->loadPageData( 'fromdbmaster' );
2298                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2299                 $id = $this->getId();
2300
2301                 if ( !$cascade ) {
2302                         $cascade = false;
2303                 }
2304
2305                 // Take this opportunity to purge out expired restrictions
2306                 Title::purgeExpiredRestrictions();
2307
2308                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2309                 // we expect a single selection, but the schema allows otherwise.
2310                 $isProtected = false;
2311                 $protect = false;
2312                 $changed = false;
2313
2314                 $dbw = wfGetDB( DB_MASTER );
2315
2316                 foreach ( $restrictionTypes as $action ) {
2317                         if ( !isset( $expiry[$action] ) ) {
2318                                 $expiry[$action] = $dbw->getInfinity();
2319                         }
2320                         if ( !isset( $limit[$action] ) ) {
2321                                 $limit[$action] = '';
2322                         } elseif ( $limit[$action] != '' ) {
2323                                 $protect = true;
2324                         }
2325
2326                         // Get current restrictions on $action
2327                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2328                         if ( $current != '' ) {
2329                                 $isProtected = true;
2330                         }
2331
2332                         if ( $limit[$action] != $current ) {
2333                                 $changed = true;
2334                         } elseif ( $limit[$action] != '' ) {
2335                                 // Only check expiry change if the action is actually being
2336                                 // protected, since expiry does nothing on an not-protected
2337                                 // action.
2338                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2339                                         $changed = true;
2340                                 }
2341                         }
2342                 }
2343
2344                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2345                         $changed = true;
2346                 }
2347
2348                 // If nothing has changed, do nothing
2349                 if ( !$changed ) {
2350                         return Status::newGood();
2351                 }
2352
2353                 if ( !$protect ) { // No protection at all means unprotection
2354                         $revCommentMsg = 'unprotectedarticle';
2355                         $logAction = 'unprotect';
2356                 } elseif ( $isProtected ) {
2357                         $revCommentMsg = 'modifiedarticleprotection';
2358                         $logAction = 'modify';
2359                 } else {
2360                         $revCommentMsg = 'protectedarticle';
2361                         $logAction = 'protect';
2362                 }
2363
2364                 // Truncate for whole multibyte characters
2365                 $reason = $wgContLang->truncate( $reason, 255 );
2366
2367                 $logRelationsValues = array();
2368                 $logRelationsField = null;
2369
2370                 if ( $id ) { // Protection of existing page
2371                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2372                                 return Status::newGood();
2373                         }
2374
2375                         // Only certain restrictions can cascade...
2376                         $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
2377                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2378                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2379                         }
2380                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2381                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2382                         }
2383
2384                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2385                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2386                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2387                         }
2388                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2389                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2390                         }
2391
2392                         // The schema allows multiple restrictions
2393                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2394                                 $cascade = false;
2395                         }
2396
2397                         // insert null revision to identify the page protection change as edit summary
2398                         $latest = $this->getLatest();
2399                         $nullRevision = $this->insertProtectNullRevision( $revCommentMsg, $limit, $expiry, $cascade, $reason );
2400                         if ( $nullRevision === null ) {
2401                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2402                         }
2403
2404                         $logRelationsField = 'pr_id';
2405
2406                         // Update restrictions table
2407                         foreach ( $limit as $action => $restrictions ) {
2408                                 $dbw->delete(
2409                                         'page_restrictions',
2410                                         array(
2411                                                 'pr_page' => $id,
2412                                                 'pr_type' => $action
2413                                         ),
2414                                         __METHOD__
2415                                 );
2416                                 if ( $restrictions != '' ) {
2417                                         $dbw->insert(
2418                                                 'page_restrictions',
2419                                                 array(
2420                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2421                                                         'pr_page' => $id,
2422                                                         'pr_type' => $action,
2423                                                         'pr_level' => $restrictions,
2424                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2425                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2426                                                 ),
2427                                                 __METHOD__
2428                                         );
2429                                         $logRelationsValues[] = $dbw->insertId();
2430                                 }
2431                         }
2432
2433                         // Clear out legacy restriction fields
2434                         $dbw->update(
2435                                 'page',
2436                                 array( 'page_restrictions' => '' ),
2437                                 array( 'page_id' => $id ),
2438                                 __METHOD__
2439                         );
2440
2441                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2442                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2443                 } else { // Protection of non-existing page (also known as "title protection")
2444                         // Cascade protection is meaningless in this case
2445                         $cascade = false;
2446
2447                         if ( $limit['create'] != '' ) {
2448                                 $dbw->replace( 'protected_titles',
2449                                         array( array( 'pt_namespace', 'pt_title' ) ),
2450                                         array(
2451                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2452                                                 'pt_title' => $this->mTitle->getDBkey(),
2453                                                 'pt_create_perm' => $limit['create'],
2454                                                 'pt_timestamp' => $dbw->timestamp(),
2455                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2456                                                 'pt_user' => $user->getId(),
2457                                                 'pt_reason' => $reason,
2458                                         ), __METHOD__
2459                                 );
2460                         } else {
2461                                 $dbw->delete( 'protected_titles',
2462                                         array(
2463                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2464                                                 'pt_title' => $this->mTitle->getDBkey()
2465                                         ), __METHOD__
2466                                 );
2467                         }
2468                 }
2469
2470                 $this->mTitle->flushRestrictions();
2471                 InfoAction::invalidateCache( $this->mTitle );
2472
2473                 if ( $logAction == 'unprotect' ) {
2474                         $params = array();
2475                 } else {
2476                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2477                         $params = array( $protectDescriptionLog, $cascade ? 'cascade' : '' );
2478                 }
2479
2480                 // Update the protection log
2481                 $log = new LogPage( 'protect' );
2482                 $logId = $log->addEntry( $logAction, $this->mTitle, $reason, $params, $user );
2483                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2484                         $log->addRelations( $logRelationsField, $logRelationsValues, $logId );
2485                 }
2486
2487                 return Status::newGood();
2488         }
2489
2490         /**
2491          * Insert a new null revision for this page.
2492          *
2493          * @param string $revCommentMsg comment message key for the revision
2494          * @param array $limit set of restriction keys
2495          * @param array $expiry per restriction type expiration
2496          * @param int $cascade Set to false if cascading protection isn't allowed.
2497          * @param string $reason
2498          * @return Revision|null on error
2499          */
2500         public function insertProtectNullRevision( $revCommentMsg, array $limit, array $expiry, $cascade, $reason ) {
2501                 global $wgContLang;
2502                 $dbw = wfGetDB( DB_MASTER );
2503
2504                 // Prepare a null revision to be added to the history
2505                 $editComment = $wgContLang->ucfirst(
2506                         wfMessage(
2507                                 $revCommentMsg,
2508                                 $this->mTitle->getPrefixedText()
2509                         )->inContentLanguage()->text()
2510                 );
2511                 if ( $reason ) {
2512                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2513                 }
2514                 $protectDescription = $this->protectDescription( $limit, $expiry );
2515                 if ( $protectDescription ) {
2516                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2517                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )->inContentLanguage()->text();
2518                 }
2519                 if ( $cascade ) {
2520                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2521                         $editComment .= wfMessage( 'brackets' )->params(
2522                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2523                         )->inContentLanguage()->text();
2524                 }
2525
2526                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true );
2527                 if ( $nullRev ) {
2528                         $nullRev->insertOn( $dbw );
2529
2530                         // Update page record and touch page
2531                         $oldLatest = $nullRev->getParentId();
2532                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2533                 }
2534
2535                 return $nullRev;
2536         }
2537
2538         /**
2539          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2540          * @return string
2541          */
2542         protected function formatExpiry( $expiry ) {
2543                 global $wgContLang;
2544                 $dbr = wfGetDB( DB_SLAVE );
2545
2546                 $encodedExpiry = $dbr->encodeExpiry( $expiry );
2547                 if ( $encodedExpiry != 'infinity' ) {
2548                         return wfMessage(
2549                                 'protect-expiring',
2550                                 $wgContLang->timeanddate( $expiry, false, false ),
2551                                 $wgContLang->date( $expiry, false, false ),
2552                                 $wgContLang->time( $expiry, false, false )
2553                         )->inContentLanguage()->text();
2554                 } else {
2555                         return wfMessage( 'protect-expiry-indefinite' )
2556                                 ->inContentLanguage()->text();
2557                 }
2558         }
2559
2560         /**
2561          * Builds the description to serve as comment for the edit.
2562          *
2563          * @param array $limit set of restriction keys
2564          * @param array $expiry per restriction type expiration
2565          * @return string
2566          */
2567         public function protectDescription( array $limit, array $expiry ) {
2568                 $protectDescription = '';
2569
2570                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2571                         # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
2572                         # All possible message keys are listed here for easier grepping:
2573                         # * restriction-create
2574                         # * restriction-edit
2575                         # * restriction-move
2576                         # * restriction-upload
2577                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2578                         # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
2579                         # with '' filtered out. All possible message keys are listed below:
2580                         # * protect-level-autoconfirmed
2581                         # * protect-level-sysop
2582                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )->inContentLanguage()->text();
2583
2584                         $expiryText = $this->formatExpiry( $expiry[$action] );
2585
2586                         if ( $protectDescription !== '' ) {
2587                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2588                         }
2589                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2590                                 ->params( $actionText, $restrictionsText, $expiryText )
2591                                 ->inContentLanguage()->text();
2592                 }
2593
2594                 return $protectDescription;
2595         }
2596
2597         /**
2598          * Builds the description to serve as comment for the log entry.
2599          *
2600          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2601          * protect description text. Keep them in old format to avoid breaking compatibility.
2602          * TODO: Fix protection log to store structured description and format it on-the-fly.
2603          *
2604          * @param array $limit set of restriction keys
2605          * @param array $expiry per restriction type expiration
2606          * @return string
2607          */
2608         public function protectDescriptionLog( array $limit, array $expiry ) {
2609                 global $wgContLang;
2610
2611                 $protectDescriptionLog = '';
2612
2613                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2614                         $expiryText = $this->formatExpiry( $expiry[$action] );
2615                         $protectDescriptionLog .= $wgContLang->getDirMark() . "[$action=$restrictions] ($expiryText)";
2616                 }
2617
2618                 return trim( $protectDescriptionLog );
2619         }
2620
2621         /**
2622          * Take an array of page restrictions and flatten it to a string
2623          * suitable for insertion into the page_restrictions field.
2624          *
2625          * @param string[] $limit
2626          *
2627          * @throws MWException
2628          * @return string
2629          */
2630         protected static function flattenRestrictions( $limit ) {
2631                 if ( !is_array( $limit ) ) {
2632                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2633                 }
2634
2635                 $bits = array();
2636                 ksort( $limit );
2637
2638                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2639                         $bits[] = "$action=$restrictions";
2640                 }
2641
2642                 return implode( ':', $bits );
2643         }
2644
2645         /**
2646          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2647          * backwards compatibility, if you care about error reporting you should use
2648          * doDeleteArticleReal() instead.
2649          *
2650          * Deletes the article with database consistency, writes logs, purges caches
2651          *
2652          * @param string $reason delete reason for deletion log
2653          * @param $suppress boolean suppress all revisions and log the deletion in
2654          *        the suppression log instead of the deletion log
2655          * @param int $id article ID
2656          * @param $commit boolean defaults to true, triggers transaction end
2657          * @param &$error Array of errors to append to
2658          * @param $user User The deleting user
2659          * @return boolean true if successful
2660          */
2661         public function doDeleteArticle(
2662                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2663         ) {
2664                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2665                 return $status->isGood();
2666         }
2667
2668         /**
2669          * Back-end article deletion
2670          * Deletes the article with database consistency, writes logs, purges caches
2671          *
2672          * @since 1.19
2673          *
2674          * @param string $reason delete reason for deletion log
2675          * @param $suppress boolean suppress all revisions and log the deletion in
2676          *        the suppression log instead of the deletion log
2677          * @param int $id article ID
2678          * @param $commit boolean defaults to true, triggers transaction end
2679          * @param &$error Array of errors to append to
2680          * @param $user User The deleting user
2681          * @return Status: Status object; if successful, $status->value is the log_id of the
2682          *                 deletion log entry. If the page couldn't be deleted because it wasn't
2683          *                 found, $status is a non-fatal 'cannotdelete' error
2684          */
2685         public function doDeleteArticleReal(
2686                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2687         ) {
2688                 global $wgUser, $wgContentHandlerUseDB;
2689
2690                 wfDebug( __METHOD__ . "\n" );
2691
2692                 $status = Status::newGood();
2693
2694                 if ( $this->mTitle->getDBkey() === '' ) {
2695                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2696                         return $status;
2697                 }
2698
2699                 $user = is_null( $user ) ? $wgUser : $user;
2700                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2701                         if ( $status->isOK() ) {
2702                                 // Hook aborted but didn't set a fatal status
2703                                 $status->fatal( 'delete-hook-aborted' );
2704                         }
2705                         return $status;
2706                 }
2707
2708                 if ( $id == 0 ) {
2709                         $this->loadPageData( 'forupdate' );
2710                         $id = $this->getID();
2711                         if ( $id == 0 ) {
2712                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2713                                 return $status;
2714                         }
2715                 }
2716
2717                 // Bitfields to further suppress the content
2718                 if ( $suppress ) {
2719                         $bitfield = 0;
2720                         // This should be 15...
2721                         $bitfield |= Revision::DELETED_TEXT;
2722                         $bitfield |= Revision::DELETED_COMMENT;
2723                         $bitfield |= Revision::DELETED_USER;
2724                         $bitfield |= Revision::DELETED_RESTRICTED;
2725                 } else {
2726                         $bitfield = 'rev_deleted';
2727                 }
2728
2729                 // we need to remember the old content so we can use it to generate all deletion updates.
2730                 $content = $this->getContent( Revision::RAW );
2731
2732                 $dbw = wfGetDB( DB_MASTER );
2733                 $dbw->begin( __METHOD__ );
2734                 // For now, shunt the revision data into the archive table.
2735                 // Text is *not* removed from the text table; bulk storage
2736                 // is left intact to avoid breaking block-compression or
2737                 // immutable storage schemes.
2738                 //
2739                 // For backwards compatibility, note that some older archive
2740                 // table entries will have ar_text and ar_flags fields still.
2741                 //
2742                 // In the future, we may keep revisions and mark them with
2743                 // the rev_deleted field, which is reserved for this purpose.
2744
2745                 $row = array(
2746                         'ar_namespace'  => 'page_namespace',
2747                         'ar_title'      => 'page_title',
2748                         'ar_comment'    => 'rev_comment',
2749                         'ar_user'       => 'rev_user',
2750                         'ar_user_text'  => 'rev_user_text',
2751                         'ar_timestamp'  => 'rev_timestamp',
2752                         'ar_minor_edit' => 'rev_minor_edit',
2753                         'ar_rev_id'     => 'rev_id',
2754                         'ar_parent_id'  => 'rev_parent_id',
2755                         'ar_text_id'    => 'rev_text_id',
2756                         'ar_text'       => '\'\'', // Be explicit to appease
2757                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2758                         'ar_len'        => 'rev_len',
2759                         'ar_page_id'    => 'page_id',
2760                         'ar_deleted'    => $bitfield,
2761                         'ar_sha1'       => 'rev_sha1',
2762                 );
2763
2764                 if ( $wgContentHandlerUseDB ) {
2765                         $row['ar_content_model'] = 'rev_content_model';
2766                         $row['ar_content_format'] = 'rev_content_format';
2767                 }
2768
2769                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2770                         $row,
2771                         array(
2772                                 'page_id' => $id,
2773                                 'page_id = rev_page'
2774                         ), __METHOD__
2775                 );
2776
2777                 // Now that it's safely backed up, delete it
2778                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2779                 $ok = ( $dbw->affectedRows() > 0 ); // $id could be laggy
2780
2781                 if ( !$ok ) {
2782                         $dbw->rollback( __METHOD__ );
2783                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2784                         return $status;
2785                 }
2786
2787                 if ( !$dbw->cascadingDeletes() ) {
2788                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2789                 }
2790
2791                 $this->doDeleteUpdates( $id, $content );
2792
2793                 // Log the deletion, if the page was suppressed, log it at Oversight instead
2794                 $logtype = $suppress ? 'suppress' : 'delete';
2795
2796                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2797                 $logEntry->setPerformer( $user );
2798                 $logEntry->setTarget( $this->mTitle );
2799                 $logEntry->setComment( $reason );
2800                 $logid = $logEntry->insert();
2801                 $logEntry->publish( $logid );
2802
2803                 if ( $commit ) {
2804                         $dbw->commit( __METHOD__ );
2805                 }
2806
2807                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id, $content, $logEntry ) );
2808                 $status->value = $logid;
2809                 return $status;
2810         }
2811
2812         /**
2813          * Do some database updates after deletion
2814          *
2815          * @param int $id page_id value of the page being deleted
2816          * @param $content Content: optional page content to be used when determining the required updates.
2817          *        This may be needed because $this->getContent() may already return null when the page proper was deleted.
2818          */
2819         public function doDeleteUpdates( $id, Content $content = null ) {
2820                 // update site status
2821                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2822
2823                 // remove secondary indexes, etc
2824                 $updates = $this->getDeletionUpdates( $content );
2825                 DataUpdate::runUpdates( $updates );
2826
2827                 // Reparse any pages transcluding this page
2828                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
2829
2830                 // Reparse any pages including this image
2831                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
2832                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
2833                 }
2834
2835                 // Clear caches
2836                 WikiPage::onArticleDelete( $this->mTitle );
2837
2838                 // Reset this object and the Title object
2839                 $this->loadFromRow( false, self::READ_LATEST );
2840
2841                 // Search engine
2842                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
2843         }
2844
2845         /**
2846          * Roll back the most recent consecutive set of edits to a page
2847          * from the same user; fails if there are no eligible edits to
2848          * roll back to, e.g. user is the sole contributor. This function
2849          * performs permissions checks on $user, then calls commitRollback()
2850          * to do the dirty work
2851          *
2852          * @todo Separate the business/permission stuff out from backend code
2853          *
2854          * @param string $fromP Name of the user whose edits to rollback.
2855          * @param string $summary Custom summary. Set to default summary if empty.
2856          * @param string $token Rollback token.
2857          * @param $bot Boolean: If true, mark all reverted edits as bot.
2858          *
2859          * @param array $resultDetails contains result-specific array of additional values
2860          *    'alreadyrolled' : 'current' (rev)
2861          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2862          *
2863          * @param $user User The user performing the rollback
2864          * @return array of errors, each error formatted as
2865          *   array(messagekey, param1, param2, ...).
2866          * On success, the array is empty.  This array can also be passed to
2867          * OutputPage::showPermissionsErrorPage().
2868          */
2869         public function doRollback(
2870                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2871         ) {
2872                 $resultDetails = null;
2873
2874                 // Check permissions
2875                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2876                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2877                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2878
2879                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2880                         $errors[] = array( 'sessionfailure' );
2881                 }
2882
2883                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2884                         $errors[] = array( 'actionthrottledtext' );
2885                 }
2886
2887                 // If there were errors, bail out now
2888                 if ( !empty( $errors ) ) {
2889                         return $errors;
2890                 }
2891
2892                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2893         }
2894
2895         /**
2896          * Backend implementation of doRollback(), please refer there for parameter
2897          * and return value documentation
2898          *
2899          * NOTE: This function does NOT check ANY permissions, it just commits the
2900          * rollback to the DB. Therefore, you should only call this function direct-
2901          * ly if you want to use custom permissions checks. If you don't, use
2902          * doRollback() instead.
2903          * @param string $fromP Name of the user whose edits to rollback.
2904          * @param string $summary Custom summary. Set to default summary if empty.
2905          * @param $bot Boolean: If true, mark all reverted edits as bot.
2906          *
2907          * @param array $resultDetails contains result-specific array of additional values
2908          * @param $guser User The user performing the rollback
2909          * @return array
2910          */
2911         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
2912                 global $wgUseRCPatrol, $wgContLang;
2913
2914                 $dbw = wfGetDB( DB_MASTER );
2915
2916                 if ( wfReadOnly() ) {
2917                         return array( array( 'readonlytext' ) );
2918                 }
2919
2920                 // Get the last editor
2921                 $current = $this->getRevision();
2922                 if ( is_null( $current ) ) {
2923                         // Something wrong... no page?
2924                         return array( array( 'notanarticle' ) );
2925                 }
2926
2927                 $from = str_replace( '_', ' ', $fromP );
2928                 // User name given should match up with the top revision.
2929                 // If the user was deleted then $from should be empty.
2930                 if ( $from != $current->getUserText() ) {
2931                         $resultDetails = array( 'current' => $current );
2932                         return array( array( 'alreadyrolled',
2933                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
2934                                 htmlspecialchars( $fromP ),
2935                                 htmlspecialchars( $current->getUserText() )
2936                         ) );
2937                 }
2938
2939                 // Get the last edit not by this guy...
2940                 // Note: these may not be public values
2941                 $user = intval( $current->getRawUser() );
2942                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
2943                 $s = $dbw->selectRow( 'revision',
2944                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
2945                         array( 'rev_page' => $current->getPage(),
2946                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
2947                         ), __METHOD__,
2948                         array( 'USE INDEX' => 'page_timestamp',
2949                                 'ORDER BY' => 'rev_timestamp DESC' )
2950                         );
2951                 if ( $s === false ) {
2952                         // No one else ever edited this page
2953                         return array( array( 'cantrollback' ) );
2954                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT || $s->rev_deleted & Revision::DELETED_USER ) {
2955                         // Only admins can see this text
2956                         return array( array( 'notvisiblerev' ) );
2957                 }
2958
2959                 // Set patrolling and bot flag on the edits, which gets rollbacked.
2960                 // This is done before the rollback edit to have patrolling also on failure (bug 62157).
2961                 $set = array();
2962                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
2963                         // Mark all reverted edits as bot
2964                         $set['rc_bot'] = 1;
2965                 }
2966
2967                 if ( $wgUseRCPatrol ) {
2968                         // Mark all reverted edits as patrolled
2969                         $set['rc_patrolled'] = 1;
2970                 }
2971
2972                 if ( count( $set ) ) {
2973                         $dbw->update( 'recentchanges', $set,
2974                                 array( /* WHERE */
2975                                         'rc_cur_id' => $current->getPage(),
2976                                         'rc_user_text' => $current->getUserText(),
2977                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
2978                                 ), __METHOD__
2979                         );
2980                 }
2981
2982                 // Generate the edit summary if necessary
2983                 $target = Revision::newFromId( $s->rev_id );
2984                 if ( empty( $summary ) ) {
2985                         if ( $from == '' ) { // no public user name
2986                                 $summary = wfMessage( 'revertpage-nouser' );
2987                         } else {
2988                                 $summary = wfMessage( 'revertpage' );
2989                         }
2990                 }
2991
2992                 // Allow the custom summary to use the same args as the default message
2993                 $args = array(
2994                         $target->getUserText(), $from, $s->rev_id,
2995                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
2996                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
2997                 );
2998                 if ( $summary instanceof Message ) {
2999                         $summary = $summary->params( $args )->inContentLanguage()->text();
3000                 } else {
3001                         $summary = wfMsgReplaceArgs( $summary, $args );
3002                 }
3003
3004                 // Trim spaces on user supplied text
3005                 $summary = trim( $summary );
3006
3007                 // Truncate for whole multibyte characters.
3008                 $summary = $wgContLang->truncate( $summary, 255 );
3009
3010                 // Save
3011                 $flags = EDIT_UPDATE;
3012
3013                 if ( $guser->isAllowed( 'minoredit' ) ) {
3014                         $flags |= EDIT_MINOR;
3015                 }
3016
3017                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3018                         $flags |= EDIT_FORCE_BOT;
3019                 }
3020
3021                 // Actually store the edit
3022                 $status = $this->doEditContent( $target->getContent(), $summary, $flags, $target->getId(), $guser );
3023
3024                 if ( !$status->isOK() ) {
3025                         return $status->getErrorsArray();
3026                 }
3027
3028                 // raise error, when the edit is an edit without a new version
3029                 if ( empty( $status->value['revision'] ) ) {
3030                         $resultDetails = array( 'current' => $current );
3031                         return array( array( 'alreadyrolled',
3032                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3033                                         htmlspecialchars( $fromP ),
3034                                         htmlspecialchars( $current->getUserText() )
3035                         ) );
3036                 }
3037
3038                 $revId = $status->value['revision']->getId();
3039
3040                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
3041
3042                 $resultDetails = array(
3043                         'summary' => $summary,
3044                         'current' => $current,
3045                         'target' => $target,
3046                         'newid' => $revId
3047                 );
3048
3049                 return array();
3050         }
3051
3052         /**
3053          * The onArticle*() functions are supposed to be a kind of hooks
3054          * which should be called whenever any of the specified actions
3055          * are done.
3056          *
3057          * This is a good place to put code to clear caches, for instance.
3058          *
3059          * This is called on page move and undelete, as well as edit
3060          *
3061          * @param $title Title object
3062          */
3063         public static function onArticleCreate( $title ) {
3064                 // Update existence markers on article/talk tabs...
3065                 if ( $title->isTalkPage() ) {
3066                         $other = $title->getSubjectPage();
3067                 } else {
3068                         $other = $title->getTalkPage();
3069                 }
3070
3071                 $other->invalidateCache();
3072                 $other->purgeSquid();
3073
3074                 $title->touchLinks();
3075                 $title->purgeSquid();
3076                 $title->deleteTitleProtection();
3077         }
3078
3079         /**
3080          * Clears caches when article is deleted
3081          *
3082          * @param $title Title
3083          */
3084         public static function onArticleDelete( $title ) {
3085                 // Update existence markers on article/talk tabs...
3086                 if ( $title->isTalkPage() ) {
3087                         $other = $title->getSubjectPage();
3088                 } else {
3089                         $other = $title->getTalkPage();
3090                 }
3091
3092                 $other->invalidateCache();
3093                 $other->purgeSquid();
3094
3095                 $title->touchLinks();
3096                 $title->purgeSquid();
3097
3098                 // File cache
3099                 HTMLFileCache::clearFileCache( $title );
3100                 InfoAction::invalidateCache( $title );
3101
3102                 // Messages
3103                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3104                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3105                 }
3106
3107                 // Images
3108                 if ( $title->getNamespace() == NS_FILE ) {
3109                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3110                         $update->doUpdate();
3111                 }
3112
3113                 // User talk pages
3114                 if ( $title->getNamespace() == NS_USER_TALK ) {
3115                         $user = User::newFromName( $title->getText(), false );
3116                         if ( $user ) {
3117                                 $user->setNewtalk( false );
3118                         }
3119                 }
3120
3121                 // Image redirects
3122                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3123         }
3124
3125         /**
3126          * Purge caches on page update etc
3127          *
3128          * @param $title Title object
3129          * @todo Verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
3130          */
3131         public static function onArticleEdit( $title ) {
3132                 // Invalidate caches of articles which include this page
3133                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
3134
3135                 // Invalidate the caches of all pages which redirect here
3136                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
3137
3138                 // Purge squid for this page only
3139                 $title->purgeSquid();
3140
3141                 // Clear file cache for this page only
3142                 HTMLFileCache::clearFileCache( $title );
3143                 InfoAction::invalidateCache( $title );
3144         }
3145
3146         /**#@-*/
3147
3148         /**
3149          * Returns a list of categories this page is a member of.
3150          * Results will include hidden categories
3151          *
3152          * @return TitleArray
3153          */
3154         public function getCategories() {
3155                 $id = $this->getId();
3156                 if ( $id == 0 ) {
3157                         return TitleArray::newFromResult( new FakeResultWrapper( array() ) );
3158                 }
3159
3160                 $dbr = wfGetDB( DB_SLAVE );
3161                 $res = $dbr->select( 'categorylinks',
3162                         array( 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ),
3163                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3164                         // as not being aliases, and NS_CATEGORY is numeric
3165                         array( 'cl_from' => $id ),
3166                         __METHOD__ );
3167
3168                 return TitleArray::newFromResult( $res );
3169         }
3170
3171         /**
3172          * Returns a list of hidden categories this page is a member of.
3173          * Uses the page_props and categorylinks tables.
3174          *
3175          * @return Array of Title objects
3176          */
3177         public function getHiddenCategories() {
3178                 $result = array();
3179                 $id = $this->getId();
3180
3181                 if ( $id == 0 ) {
3182                         return array();
3183                 }
3184
3185                 $dbr = wfGetDB( DB_SLAVE );
3186                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3187                         array( 'cl_to' ),
3188                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3189                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
3190                         __METHOD__ );
3191
3192                 if ( $res !== false ) {
3193                         foreach ( $res as $row ) {
3194                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3195                         }
3196                 }
3197
3198                 return $result;
3199         }
3200
3201         /**
3202          * Return an applicable autosummary if one exists for the given edit.
3203          * @param string|null $oldtext the previous text of the page.
3204          * @param string|null $newtext The submitted text of the page.
3205          * @param int $flags bitmask: a bitmask of flags submitted for the edit.
3206          * @return string An appropriate autosummary, or an empty string.
3207          *
3208          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3209          */
3210         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3211                 // NOTE: stub for backwards-compatibility. assumes the given text is wikitext. will break horribly if it isn't.
3212
3213                 ContentHandler::deprecated( __METHOD__, '1.21' );
3214
3215                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3216                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3217                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3218
3219                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3220         }
3221
3222         /**
3223          * Auto-generates a deletion reason
3224          *
3225          * @param &$hasHistory Boolean: whether the page has a history
3226          * @return mixed String containing deletion reason or empty string, or boolean false
3227          *    if no revision occurred
3228          */
3229         public function getAutoDeleteReason( &$hasHistory ) {
3230                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3231         }
3232
3233         /**
3234          * Update all the appropriate counts in the category table, given that
3235          * we've added the categories $added and deleted the categories $deleted.
3236          *
3237          * @param array $added   The names of categories that were added
3238          * @param array $deleted The names of categories that were deleted
3239          */
3240         public function updateCategoryCounts( array $added, array $deleted ) {
3241                 $that = $this;
3242                 $method = __METHOD__;
3243                 $dbw = wfGetDB( DB_MASTER );
3244
3245                 // Do this at the end of the commit to reduce lock wait timeouts
3246                 $dbw->onTransactionPreCommitOrIdle(
3247                         function() use ( $dbw, $that, $method, $added, $deleted ) {
3248                                 $ns = $that->getTitle()->getNamespace();
3249
3250                                 $addFields = array( 'cat_pages = cat_pages + 1' );
3251                                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3252                                 if ( $ns == NS_CATEGORY ) {
3253                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3254                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3255                                 } elseif ( $ns == NS_FILE ) {
3256                                         $addFields[] = 'cat_files = cat_files + 1';
3257                                         $removeFields[] = 'cat_files = cat_files - 1';
3258                                 }
3259
3260                                 if ( count( $added ) ) {
3261                                         $insertRows = array();
3262                                         foreach ( $added as $cat ) {
3263                                                 $insertRows[] = array(
3264                                                         'cat_title'   => $cat,
3265                                                         'cat_pages'   => 1,
3266                                                         'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3267                                                         'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3268                                                 );
3269                                         }
3270                                         $dbw->upsert(
3271                                                 'category',
3272                                                 $insertRows,
3273                                                 array( 'cat_title' ),
3274                                                 $addFields,
3275                                                 $method
3276                                         );
3277                                 }
3278
3279                                 if ( count( $deleted ) ) {
3280                                         $dbw->update(
3281                                                 'category',
3282                                                 $removeFields,
3283                                                 array( 'cat_title' => $deleted ),
3284                                                 $method
3285                                         );
3286                                 }
3287
3288                                 foreach ( $added as $catName ) {
3289                                         $cat = Category::newFromName( $catName );
3290                                         wfRunHooks( 'CategoryAfterPageAdded', array( $cat, $that ) );
3291                                 }
3292
3293                                 foreach ( $deleted as $catName ) {
3294                                         $cat = Category::newFromName( $catName );
3295                                         wfRunHooks( 'CategoryAfterPageRemoved', array( $cat, $that ) );
3296                                 }
3297                         }
3298                 );
3299         }
3300
3301         /**
3302          * Updates cascading protections
3303          *
3304          * @param $parserOutput ParserOutput object for the current version
3305          */
3306         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
3307                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
3308                         return;
3309                 }
3310
3311                 // templatelinks or imagelinks tables may have become out of sync,
3312                 // especially if using variable-based transclusions.
3313                 // For paranoia, check if things have changed and if
3314                 // so apply updates to the database. This will ensure
3315                 // that cascaded protections apply as soon as the changes
3316                 // are visible.
3317
3318                 // Get templates from templatelinks and images from imagelinks
3319                 $id = $this->getId();
3320
3321                 $dbLinks = array();
3322
3323                 $dbr = wfGetDB( DB_SLAVE );
3324                 $res = $dbr->select( array( 'templatelinks' ),
3325                         array( 'tl_namespace', 'tl_title' ),
3326                         array( 'tl_from' => $id ),
3327                         __METHOD__
3328                 );
3329
3330                 foreach ( $res as $row ) {
3331                         $dbLinks["{$row->tl_namespace}:{$row->tl_title}"] = true;
3332                 }
3333
3334                 $dbr = wfGetDB( DB_SLAVE );
3335                 $res = $dbr->select( array( 'imagelinks' ),
3336                         array( 'il_to' ),
3337                         array( 'il_from' => $id ),
3338                         __METHOD__
3339                 );
3340
3341                 foreach ( $res as $row ) {
3342                         $dbLinks[NS_FILE . ":{$row->il_to}"] = true;
3343                 }
3344
3345                 // Get templates and images from parser output.
3346                 $poLinks = array();
3347                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3348                         foreach ( $templates as $dbk => $id ) {
3349                                 $poLinks["$ns:$dbk"] = true;
3350                         }
3351                 }
3352                 foreach ( $parserOutput->getImages() as $dbk => $id ) {
3353                         $poLinks[NS_FILE . ":$dbk"] = true;
3354                 }
3355
3356                 // Get the diff
3357                 $links_diff = array_diff_key( $poLinks, $dbLinks );
3358
3359                 if ( count( $links_diff ) > 0 ) {
3360                         // Whee, link updates time.
3361                         // Note: we are only interested in links here. We don't need to get other DataUpdate items from the parser output.
3362                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3363                         $u->doUpdate();
3364                 }
3365         }
3366
3367         /**
3368          * Return a list of templates used by this article.
3369          * Uses the templatelinks table
3370          *
3371          * @deprecated in 1.19; use Title::getTemplateLinksFrom()
3372          * @return Array of Title objects
3373          */
3374         public function getUsedTemplates() {
3375                 return $this->mTitle->getTemplateLinksFrom();
3376         }
3377
3378         /**
3379          * This function is called right before saving the wikitext,
3380          * so we can do things like signatures and links-in-context.
3381          *
3382          * @deprecated in 1.19; use Parser::preSaveTransform() instead
3383          * @param string $text article contents
3384          * @param $user User object: user doing the edit
3385          * @param $popts ParserOptions object: parser options, default options for
3386          *               the user loaded if null given
3387          * @return string article contents with altered wikitext markup (signatures
3388          *      converted, {{subst:}}, templates, etc.)
3389          */
3390         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3391                 global $wgParser, $wgUser;
3392
3393                 wfDeprecated( __METHOD__, '1.19' );
3394
3395                 $user = is_null( $user ) ? $wgUser : $user;
3396
3397                 if ( $popts === null ) {
3398                         $popts = ParserOptions::newFromUser( $user );
3399                 }
3400
3401                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3402         }
3403
3404         /**
3405          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
3406          *
3407          * @deprecated in 1.19; use Title::isBigDeletion() instead.
3408          * @return bool
3409          */
3410         public function isBigDeletion() {
3411                 wfDeprecated( __METHOD__, '1.19' );
3412                 return $this->mTitle->isBigDeletion();
3413         }
3414
3415         /**
3416          * Get the  approximate revision count of this page.
3417          *
3418          * @deprecated in 1.19; use Title::estimateRevisionCount() instead.
3419          * @return int
3420          */
3421         public function estimateRevisionCount() {
3422                 wfDeprecated( __METHOD__, '1.19' );
3423                 return $this->mTitle->estimateRevisionCount();
3424         }
3425
3426         /**
3427          * Update the article's restriction field, and leave a log entry.
3428          *
3429          * @deprecated since 1.19
3430          * @param array $limit set of restriction keys
3431          * @param $reason String
3432          * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
3433          * @param array $expiry per restriction type expiration
3434          * @param $user User The user updating the restrictions
3435          * @return bool true on success
3436          */
3437         public function updateRestrictions(
3438                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3439         ) {
3440                 global $wgUser;
3441
3442                 $user = is_null( $user ) ? $wgUser : $user;
3443
3444                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3445         }
3446
3447         /**
3448          * Returns a list of updates to be performed when this page is deleted. The updates should remove any information
3449          * about this page from secondary data stores such as links tables.
3450          *
3451          * @param Content|null $content optional Content object for determining the necessary updates
3452          * @return Array an array of DataUpdates objects
3453          */
3454         public function getDeletionUpdates( Content $content = null ) {
3455                 if ( !$content ) {
3456                         // load content object, which may be used to determine the necessary updates
3457                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3458                         $content = $this->getContent( Revision::RAW );
3459                 }
3460
3461                 if ( !$content ) {
3462                         $updates = array();
3463                 } else {
3464                         $updates = $content->getDeletionUpdates( $this );
3465                 }
3466
3467                 wfRunHooks( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3468                 return $updates;
3469         }
3470
3471 }
3472
3473 class PoolWorkArticleView extends PoolCounterWork {
3474
3475         /**
3476          * @var Page
3477          */
3478         private $page;
3479
3480         /**
3481          * @var string
3482          */
3483         private $cacheKey;
3484
3485         /**
3486          * @var integer
3487          */
3488         private $revid;
3489
3490         /**
3491          * @var ParserOptions
3492          */
3493         private $parserOptions;
3494
3495         /**
3496          * @var Content|null
3497          */
3498         private $content = null;
3499
3500         /**
3501          * @var ParserOutput|bool
3502          */
3503         private $parserOutput = false;
3504
3505         /**
3506          * @var bool
3507          */
3508         private $isDirty = false;
3509
3510         /**
3511          * @var Status|bool
3512          */
3513         private $error = false;
3514
3515         /**
3516          * Constructor
3517          *
3518          * @param $page Page|WikiPage
3519          * @param $revid Integer: ID of the revision being parsed
3520          * @param $useParserCache Boolean: whether to use the parser cache
3521          * @param $parserOptions parserOptions to use for the parse operation
3522          * @param $content Content|String: content to parse or null to load it; may also be given as a wikitext string, for BC
3523          */
3524         public function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $content = null ) {
3525                 if ( is_string( $content ) ) { // BC: old style call
3526                         $modelId = $page->getRevision()->getContentModel();
3527                         $format = $page->getRevision()->getContentFormat();
3528                         $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelId, $format );
3529                 }
3530
3531                 $this->page = $page;
3532                 $this->revid = $revid;
3533                 $this->cacheable = $useParserCache;
3534                 $this->parserOptions = $parserOptions;
3535                 $this->content = $content;
3536                 $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
3537                 parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
3538         }
3539
3540         /**
3541          * Get the ParserOutput from this object, or false in case of failure
3542          *
3543          * @return ParserOutput
3544          */
3545         public function getParserOutput() {
3546                 return $this->parserOutput;
3547         }
3548
3549         /**
3550          * Get whether the ParserOutput is a dirty one (i.e. expired)
3551          *
3552          * @return bool
3553          */
3554         public function getIsDirty() {
3555                 return $this->isDirty;
3556         }
3557
3558         /**
3559          * Get a Status object in case of error or false otherwise
3560          *
3561          * @return Status|bool
3562          */
3563         public function getError() {
3564                 return $this->error;
3565         }
3566
3567         /**
3568          * @return bool
3569          */
3570         public function doWork() {
3571                 global $wgUseFileCache;
3572
3573                 // @todo several of the methods called on $this->page are not declared in Page, but present
3574                 //        in WikiPage and delegated by Article.
3575
3576                 $isCurrent = $this->revid === $this->page->getLatest();
3577
3578                 if ( $this->content !== null ) {
3579                         $content = $this->content;
3580                 } elseif ( $isCurrent ) {
3581                         // XXX: why use RAW audience here, and PUBLIC (default) below?
3582                         $content = $this->page->getContent( Revision::RAW );
3583                 } else {
3584                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
3585
3586                         if ( $rev === null ) {
3587                                 $content = null;
3588                         } else {
3589                                 // XXX: why use PUBLIC audience here (default), and RAW above?
3590                                 $content = $rev->getContent();
3591                         }
3592                 }
3593
3594                 if ( $content === null ) {
3595                         return false;
3596                 }
3597
3598                 // Reduce effects of race conditions for slow parses (bug 46014)
3599                 $cacheTime = wfTimestampNow();
3600
3601                 $time = - microtime( true );
3602                 $this->parserOutput = $content->getParserOutput( $this->page->getTitle(), $this->revid, $this->parserOptions );
3603                 $time += microtime( true );
3604
3605                 // Timing hack
3606                 if ( $time > 3 ) {
3607                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
3608                                 $this->page->getTitle()->getPrefixedDBkey() ) );
3609                 }
3610
3611                 if ( $this->cacheable && $this->parserOutput->isCacheable() && $isCurrent ) {
3612                         ParserCache::singleton()->save(
3613                                 $this->parserOutput, $this->page, $this->parserOptions, $cacheTime, $this->revid );
3614                 }
3615
3616                 // Make sure file cache is not used on uncacheable content.
3617                 // Output that has magic words in it can still use the parser cache
3618                 // (if enabled), though it will generally expire sooner.
3619                 if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
3620                         $wgUseFileCache = false;
3621                 }
3622
3623                 if ( $isCurrent ) {
3624                         $this->page->doCascadeProtectionUpdates( $this->parserOutput );
3625                 }
3626
3627                 return true;
3628         }
3629
3630         /**
3631          * @return bool
3632          */
3633         public function getCachedWork() {
3634                 $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
3635
3636                 if ( $this->parserOutput === false ) {
3637                         wfDebug( __METHOD__ . ": parser cache miss\n" );
3638                         return false;
3639                 } else {
3640                         wfDebug( __METHOD__ . ": parser cache hit\n" );
3641                         return true;
3642                 }
3643         }
3644
3645         /**
3646          * @return bool
3647          */
3648         public function fallback() {
3649                 $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
3650
3651                 if ( $this->parserOutput === false ) {
3652                         wfDebugLog( 'dirty', 'dirty missing' );
3653                         wfDebug( __METHOD__ . ": no dirty cache\n" );
3654                         return false;
3655                 } else {
3656                         wfDebug( __METHOD__ . ": sending dirty output\n" );
3657                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}" );
3658                         $this->isDirty = true;
3659                         return true;
3660                 }
3661         }
3662
3663         /**
3664          * @param $status Status
3665          * @return bool
3666          */
3667         public function error( $status ) {
3668                 $this->error = $status;
3669                 return false;
3670         }
3671 }