includes/page/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 object $row Database row containing at least fields returned by selectFields().
 165          * @param string|int $from Source of $data:
 166          *        - "fromdb" or WikiPage::READ_NORMAL: from a slave DB
 167          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 168          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 169          * @return WikiPage
 170          */
 171         public static function newFromRow( $row, $from = 'fromdb' ) {
 172                 $page = self::factory( Title::newFromRow( $row ) );
 173                 $page->loadFromRow( $row, $from );
 174                 return $page;
 175         }
 176
 177         /**
 178          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 179          *
 180          * @param object|string|int $type
 181          * @return mixed
 182          */
 183         private static function convertSelectType( $type ) {
 184                 switch ( $type ) {
 185                 case 'fromdb':
 186                         return self::READ_NORMAL;
 187                 case 'fromdbmaster':
 188                         return self::READ_LATEST;
 189                 case 'forupdate':
 190                         return self::READ_LOCKING;
 191                 default:
 192                         // It may already be an integer or whatever else
 193                         return $type;
 194                 }
 195         }
 196
 197         /**
 198          * Returns overrides for action handlers.
 199          * Classes listed here will be used instead of the default one when
 200          * (and only when) $wgActions[$action] === true. This allows subclasses
 201          * to override the default behavior.
 202          *
 203          * @todo Move this UI stuff somewhere else
 204          *
 205          * @return array
 206          */
 207         public function getActionOverrides() {
 208                 $content_handler = $this->getContentHandler();
 209                 return $content_handler->getActionOverrides();
 210         }
 211
 212         /**
 213          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 214          *
 215          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 216          *
 217          * @return ContentHandler
 218          *
 219          * @since 1.21
 220          */
 221         public function getContentHandler() {
 222                 return ContentHandler::getForModelID( $this->getContentModel() );
 223         }
 224
 225         /**
 226          * Get the title object of the article
 227          * @return Title Title object of this page
 228          */
 229         public function getTitle() {
 230                 return $this->mTitle;
 231         }
 232
 233         /**
 234          * Clear the object
 235          * @return void
 236          */
 237         public function clear() {
 238                 $this->mDataLoaded = false;
 239                 $this->mDataLoadedFrom = self::READ_NONE;
 240
 241                 $this->clearCacheFields();
 242         }
 243
 244         /**
 245          * Clear the object cache fields
 246          * @return void
 247          */
 248         protected function clearCacheFields() {
 249                 $this->mId = null;
 250                 $this->mCounter = null;
 251                 $this->mRedirectTarget = null; // Title object if set
 252                 $this->mLastRevision = null; // Latest revision
 253                 $this->mTouched = '19700101000000';
 254                 $this->mLinksUpdated = '19700101000000';
 255                 $this->mTimestamp = '';
 256                 $this->mIsRedirect = false;
 257                 $this->mLatest = false;
 258                 // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 259                 // the requested rev ID and content against the cached one for equality. For most
 260                 // content types, the output should not change during the lifetime of this cache.
 261                 // Clearing it can cause extra parses on edit for no reason.
 262         }
 263
 264         /**
 265          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 266          * @return void
 267          * @since 1.23
 268          */
 269         public function clearPreparedEdit() {
 270                 $this->mPreparedEdit = false;
 271         }
 272
 273         /**
 274          * Return the list of revision fields that should be selected to create
 275          * a new page.
 276          *
 277          * @return array
 278          */
 279         public static function selectFields() {
 280                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 281
 282                 $fields = array(
 283                         'page_id',
 284                         'page_namespace',
 285                         'page_title',
 286                         'page_restrictions',
 287                         'page_counter',
 288                         'page_is_redirect',
 289                         'page_is_new',
 290                         'page_random',
 291                         'page_touched',
 292                         'page_links_updated',
 293                         'page_latest',
 294                         'page_len',
 295                 );
 296
 297                 if ( $wgContentHandlerUseDB ) {
 298                         $fields[] = 'page_content_model';
 299                 }
 300
 301                 if ( $wgPageLanguageUseDB ) {
 302                         $fields[] = 'page_lang';
 303                 }
 304
 305                 return $fields;
 306         }
 307
 308         /**
 309          * Fetch a page record with the given conditions
 310          * @param DatabaseBase $dbr
 311          * @param array $conditions
 312          * @param array $options
 313          * @return object|bool Database result resource, or false on failure
 314          */
 315         protected function pageData( $dbr, $conditions, $options = array() ) {
 316                 $fields = self::selectFields();
 317
 318                 wfRunHooks( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 319
 320                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 321
 322                 wfRunHooks( 'ArticlePageDataAfter', array( &$this, &$row ) );
 323
 324                 return $row;
 325         }
 326
 327         /**
 328          * Fetch a page record matching the Title object's namespace and title
 329          * using a sanitized title string
 330          *
 331          * @param DatabaseBase $dbr
 332          * @param Title $title
 333          * @param array $options
 334          * @return object|bool Database result resource, or false on failure
 335          */
 336         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 337                 return $this->pageData( $dbr, array(
 338                         'page_namespace' => $title->getNamespace(),
 339                         'page_title' => $title->getDBkey() ), $options );
 340         }
 341
 342         /**
 343          * Fetch a page record matching the requested ID
 344          *
 345          * @param DatabaseBase $dbr
 346          * @param int $id
 347          * @param array $options
 348          * @return object|bool Database result resource, or false on failure
 349          */
 350         public function pageDataFromId( $dbr, $id, $options = array() ) {
 351                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 352         }
 353
 354         /**
 355          * Set the general counter, title etc data loaded from
 356          * some source.
 357          *
 358          * @param object|string|int $from One of the following:
 359          *   - A DB query result object.
 360          *   - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB.
 361          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 362          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 363          *     using SELECT FOR UPDATE.
 364          *
 365          * @return void
 366          */
 367         public function loadPageData( $from = 'fromdb' ) {
 368                 $from = self::convertSelectType( $from );
 369                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 370                         // We already have the data from the correct location, no need to load it twice.
 371                         return;
 372                 }
 373
 374                 if ( $from === self::READ_LOCKING ) {
 375                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 376                 } elseif ( $from === self::READ_LATEST ) {
 377                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 378                 } elseif ( $from === self::READ_NORMAL ) {
 379                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 380                         // Use a "last rev inserted" timestamp key to diminish the issue of slave lag.
 381                         // Note that DB also stores the master position in the session and checks it.
 382                         $touched = $this->getCachedLastEditTime();
 383                         if ( $touched ) { // key set
 384                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 385                                         $from = self::READ_LATEST;
 386                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 387                                 }
 388                         }
 389                 } else {
 390                         // No idea from where the caller got this data, assume slave database.
 391                         $data = $from;
 392                         $from = self::READ_NORMAL;
 393                 }
 394
 395                 $this->loadFromRow( $data, $from );
 396         }
 397
 398         /**
 399          * Load the object from a database row
 400          *
 401          * @since 1.20
 402          * @param object $data Database row containing at least fields returned by selectFields()
 403          * @param string|int $from One of the following:
 404          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 405          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 406          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from from
 407          *          the master DB using SELECT FOR UPDATE
 408          */
 409         public function loadFromRow( $data, $from ) {
 410                 $lc = LinkCache::singleton();
 411                 $lc->clearLink( $this->mTitle );
 412
 413                 if ( $data ) {
 414                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 415
 416                         $this->mTitle->loadFromRow( $data );
 417
 418                         // Old-fashioned restrictions
 419                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 420
 421                         $this->mId = intval( $data->page_id );
 422                         $this->mCounter = intval( $data->page_counter );
 423                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 424                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 425                         $this->mIsRedirect = intval( $data->page_is_redirect );
 426                         $this->mLatest = intval( $data->page_latest );
 427                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 428                         // Double-check the ID of any cached latest Revision object for consistency.
 429                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 430                                 $this->mLastRevision = null;
 431                                 $this->mTimestamp = '';
 432                         }
 433                 } else {
 434                         $lc->addBadLinkObj( $this->mTitle );
 435
 436                         $this->mTitle->loadFromRow( false );
 437
 438                         $this->clearCacheFields();
 439
 440                         $this->mId = 0;
 441                 }
 442
 443                 $this->mDataLoaded = true;
 444                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 445         }
 446
 447         /**
 448          * @return int Page ID
 449          */
 450         public function getId() {
 451                 if ( !$this->mDataLoaded ) {
 452                         $this->loadPageData();
 453                 }
 454                 return $this->mId;
 455         }
 456
 457         /**
 458          * @return bool Whether or not the page exists in the database
 459          */
 460         public function exists() {
 461                 if ( !$this->mDataLoaded ) {
 462                         $this->loadPageData();
 463                 }
 464                 return $this->mId > 0;
 465         }
 466
 467         /**
 468          * Check if this page is something we're going to be showing
 469          * some sort of sensible content for. If we return false, page
 470          * views (plain action=view) will return an HTTP 404 response,
 471          * so spiders and robots can know they're following a bad link.
 472          *
 473          * @return bool
 474          */
 475         public function hasViewableContent() {
 476                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 477         }
 478
 479         /**
 480          * @return int The view count for the page
 481          */
 482         public function getCount() {
 483                 if ( !$this->mDataLoaded ) {
 484                         $this->loadPageData();
 485                 }
 486
 487                 return $this->mCounter;
 488         }
 489
 490         /**
 491          * Tests if the article content represents a redirect
 492          *
 493          * @return bool
 494          */
 495         public function isRedirect() {
 496                 $content = $this->getContent();
 497                 if ( !$content ) {
 498                         return false;
 499                 }
 500
 501                 return $content->isRedirect();
 502         }
 503
 504         /**
 505          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 506          *
 507          * Will use the revisions actual content model if the page exists,
 508          * and the page's default if the page doesn't exist yet.
 509          *
 510          * @return string
 511          *
 512          * @since 1.21
 513          */
 514         public function getContentModel() {
 515                 if ( $this->exists() ) {
 516                         // look at the revision's actual content model
 517                         $rev = $this->getRevision();
 518
 519                         if ( $rev !== null ) {
 520                                 return $rev->getContentModel();
 521                         } else {
 522                                 $title = $this->mTitle->getPrefixedDBkey();
 523                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 524                         }
 525                 }
 526
 527                 // use the default model for this page
 528                 return $this->mTitle->getContentModel();
 529         }
 530
 531         /**
 532          * Loads page_touched and returns a value indicating if it should be used
 533          * @return bool true if not a redirect
 534          */
 535         public function checkTouched() {
 536                 if ( !$this->mDataLoaded ) {
 537                         $this->loadPageData();
 538                 }
 539                 return !$this->mIsRedirect;
 540         }
 541
 542         /**
 543          * Get the page_touched field
 544          * @return string Containing GMT timestamp
 545          */
 546         public function getTouched() {
 547                 if ( !$this->mDataLoaded ) {
 548                         $this->loadPageData();
 549                 }
 550                 return $this->mTouched;
 551         }
 552
 553         /**
 554          * Get the page_links_updated field
 555          * @return string|null Containing GMT timestamp
 556          */
 557         public function getLinksTimestamp() {
 558                 if ( !$this->mDataLoaded ) {
 559                         $this->loadPageData();
 560                 }
 561                 return $this->mLinksUpdated;
 562         }
 563
 564         /**
 565          * Get the page_latest field
 566          * @return int rev_id of current revision
 567          */
 568         public function getLatest() {
 569                 if ( !$this->mDataLoaded ) {
 570                         $this->loadPageData();
 571                 }
 572                 return (int)$this->mLatest;
 573         }
 574
 575         /**
 576          * Get the Revision object of the oldest revision
 577          * @return Revision|null
 578          */
 579         public function getOldestRevision() {
 580                 wfProfileIn( __METHOD__ );
 581
 582                 // Try using the slave database first, then try the master
 583                 $continue = 2;
 584                 $db = wfGetDB( DB_SLAVE );
 585                 $revSelectFields = Revision::selectFields();
 586
 587                 $row = null;
 588                 while ( $continue ) {
 589                         $row = $db->selectRow(
 590                                 array( 'page', 'revision' ),
 591                                 $revSelectFields,
 592                                 array(
 593                                         'page_namespace' => $this->mTitle->getNamespace(),
 594                                         'page_title' => $this->mTitle->getDBkey(),
 595                                         'rev_page = page_id'
 596                                 ),
 597                                 __METHOD__,
 598                                 array(
 599                                         'ORDER BY' => 'rev_timestamp ASC'
 600                                 )
 601                         );
 602
 603                         if ( $row ) {
 604                                 $continue = 0;
 605                         } else {
 606                                 $db = wfGetDB( DB_MASTER );
 607                                 $continue--;
 608                         }
 609                 }
 610
 611                 wfProfileOut( __METHOD__ );
 612                 return $row ? Revision::newFromRow( $row ) : null;
 613         }
 614
 615         /**
 616          * Loads everything except the text
 617          * This isn't necessary for all uses, so it's only done if needed.
 618          */
 619         protected function loadLastEdit() {
 620                 if ( $this->mLastRevision !== null ) {
 621                         return; // already loaded
 622                 }
 623
 624                 $latest = $this->getLatest();
 625                 if ( !$latest ) {
 626                         return; // page doesn't exist or is missing page_latest info
 627                 }
 628
 629                 // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always includes the
 630                 // latest changes committed. This is true even within REPEATABLE-READ transactions, where
 631                 // S1 normally only sees changes committed before the first S1 SELECT. Thus we need S1 to
 632                 // also gets the revision row FOR UPDATE; otherwise, it may not find it since a page row
 633                 // UPDATE and revision row INSERT by S2 may have happened after the first S1 SELECT.
 634                 // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 635                 $flags = ( $this->mDataLoadedFrom == self::READ_LOCKING ) ? Revision::READ_LOCKING : 0;
 636                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 637                 if ( $revision ) { // sanity
 638                         $this->setLastEdit( $revision );
 639                 }
 640         }
 641
 642         /**
 643          * Set the latest revision
 644          * @param Revision $revision
 645          */
 646         protected function setLastEdit( Revision $revision ) {
 647                 $this->mLastRevision = $revision;
 648                 $this->mTimestamp = $revision->getTimestamp();
 649         }
 650
 651         /**
 652          * Get the latest revision
 653          * @return Revision|null
 654          */
 655         public function getRevision() {
 656                 $this->loadLastEdit();
 657                 if ( $this->mLastRevision ) {
 658                         return $this->mLastRevision;
 659                 }
 660                 return null;
 661         }
 662
 663         /**
 664          * Get the content of the current revision. No side-effects...
 665          *
 666          * @param int $audience int One of:
 667          *   Revision::FOR_PUBLIC       to be displayed to all users
 668          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 669          *   Revision::RAW              get the text regardless of permissions
 670          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 671          *   to the $audience parameter
 672          * @return Content|null The content of the current revision
 673          *
 674          * @since 1.21
 675          */
 676         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 677                 $this->loadLastEdit();
 678                 if ( $this->mLastRevision ) {
 679                         return $this->mLastRevision->getContent( $audience, $user );
 680                 }
 681                 return null;
 682         }
 683
 684         /**
 685          * Get the text of the current revision. No side-effects...
 686          *
 687          * @param int $audience One of:
 688          *   Revision::FOR_PUBLIC       to be displayed to all users
 689          *   Revision::FOR_THIS_USER    to be displayed to the given user
 690          *   Revision::RAW              get the text regardless of permissions
 691          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 692          *   to the $audience parameter
 693          * @return string|bool The text of the current revision
 694          * @deprecated since 1.21, getContent() should be used instead.
 695          */
 696         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 697                 ContentHandler::deprecated( __METHOD__, '1.21' );
 698
 699                 $this->loadLastEdit();
 700                 if ( $this->mLastRevision ) {
 701                         return $this->mLastRevision->getText( $audience, $user );
 702                 }
 703                 return false;
 704         }
 705
 706         /**
 707          * Get the text of the current revision. No side-effects...
 708          *
 709          * @return string|bool The text of the current revision. False on failure
 710          * @deprecated since 1.21, getContent() should be used instead.
 711          */
 712         public function getRawText() {
 713                 ContentHandler::deprecated( __METHOD__, '1.21' );
 714
 715                 return $this->getText( Revision::RAW );
 716         }
 717
 718         /**
 719          * @return string MW timestamp of last article revision
 720          */
 721         public function getTimestamp() {
 722                 // Check if the field has been filled by WikiPage::setTimestamp()
 723                 if ( !$this->mTimestamp ) {
 724                         $this->loadLastEdit();
 725                 }
 726
 727                 return wfTimestamp( TS_MW, $this->mTimestamp );
 728         }
 729
 730         /**
 731          * Set the page timestamp (use only to avoid DB queries)
 732          * @param string $ts MW timestamp of last article revision
 733          * @return void
 734          */
 735         public function setTimestamp( $ts ) {
 736                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 737         }
 738
 739         /**
 740          * @param int $audience One of:
 741          *   Revision::FOR_PUBLIC       to be displayed to all users
 742          *   Revision::FOR_THIS_USER    to be displayed to the given user
 743          *   Revision::RAW              get the text regardless of permissions
 744          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 745          *   to the $audience parameter
 746          * @return int user ID for the user that made the last article revision
 747          */
 748         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 749                 $this->loadLastEdit();
 750                 if ( $this->mLastRevision ) {
 751                         return $this->mLastRevision->getUser( $audience, $user );
 752                 } else {
 753                         return -1;
 754                 }
 755         }
 756
 757         /**
 758          * Get the User object of the user who created the page
 759          * @param int $audience One of:
 760          *   Revision::FOR_PUBLIC       to be displayed to all users
 761          *   Revision::FOR_THIS_USER    to be displayed to the given user
 762          *   Revision::RAW              get the text regardless of permissions
 763          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 764          *   to the $audience parameter
 765          * @return User|null
 766          */
 767         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 768                 $revision = $this->getOldestRevision();
 769                 if ( $revision ) {
 770                         $userName = $revision->getUserText( $audience, $user );
 771                         return User::newFromName( $userName, false );
 772                 } else {
 773                         return null;
 774                 }
 775         }
 776
 777         /**
 778          * @param int $audience One of:
 779          *   Revision::FOR_PUBLIC       to be displayed to all users
 780          *   Revision::FOR_THIS_USER    to be displayed to the given user
 781          *   Revision::RAW              get the text regardless of permissions
 782          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 783          *   to the $audience parameter
 784          * @return string username of the user that made the last article revision
 785          */
 786         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 787                 $this->loadLastEdit();
 788                 if ( $this->mLastRevision ) {
 789                         return $this->mLastRevision->getUserText( $audience, $user );
 790                 } else {
 791                         return '';
 792                 }
 793         }
 794
 795         /**
 796          * @param int $audience One of:
 797          *   Revision::FOR_PUBLIC       to be displayed to all users
 798          *   Revision::FOR_THIS_USER    to be displayed to the given user
 799          *   Revision::RAW              get the text regardless of permissions
 800          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 801          *   to the $audience parameter
 802          * @return string Comment stored for the last article revision
 803          */
 804         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 805                 $this->loadLastEdit();
 806                 if ( $this->mLastRevision ) {
 807                         return $this->mLastRevision->getComment( $audience, $user );
 808                 } else {
 809                         return '';
 810                 }
 811         }
 812
 813         /**
 814          * Returns true if last revision was marked as "minor edit"
 815          *
 816          * @return bool Minor edit indicator for the last article revision.
 817          */
 818         public function getMinorEdit() {
 819                 $this->loadLastEdit();
 820                 if ( $this->mLastRevision ) {
 821                         return $this->mLastRevision->isMinor();
 822                 } else {
 823                         return false;
 824                 }
 825         }
 826
 827         /**
 828          * Get the cached timestamp for the last time the page changed.
 829          * This is only used to help handle slave lag by comparing to page_touched.
 830          * @return string MW timestamp
 831          */
 832         protected function getCachedLastEditTime() {
 833                 global $wgMemc;
 834                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 835                 return $wgMemc->get( $key );
 836         }
 837
 838         /**
 839          * Set the cached timestamp for the last time the page changed.
 840          * This is only used to help handle slave lag by comparing to page_touched.
 841          * @param string $timestamp
 842          * @return void
 843          */
 844         public function setCachedLastEditTime( $timestamp ) {
 845                 global $wgMemc;
 846                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 847                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60 * 15 );
 848         }
 849
 850         /**
 851          * Determine whether a page would be suitable for being counted as an
 852          * article in the site_stats table based on the title & its content
 853          *
 854          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 855          *   if false, the current database state will be used
 856          * @return bool
 857          */
 858         public function isCountable( $editInfo = false ) {
 859                 global $wgArticleCountMethod;
 860
 861                 if ( !$this->mTitle->isContentPage() ) {
 862                         return false;
 863                 }
 864
 865                 if ( $editInfo ) {
 866                         $content = $editInfo->pstContent;
 867                 } else {
 868                         $content = $this->getContent();
 869                 }
 870
 871                 if ( !$content || $content->isRedirect() ) {
 872                         return false;
 873                 }
 874
 875                 $hasLinks = null;
 876
 877                 if ( $wgArticleCountMethod === 'link' ) {
 878                         // nasty special case to avoid re-parsing to detect links
 879
 880                         if ( $editInfo ) {
 881                                 // ParserOutput::getLinks() is a 2D array of page links, so
 882                                 // to be really correct we would need to recurse in the array
 883                                 // but the main array should only have items in it if there are
 884                                 // links.
 885                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 886                         } else {
 887                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 888                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 889                         }
 890                 }
 891
 892                 return $content->isCountable( $hasLinks );
 893         }
 894
 895         /**
 896          * If this page is a redirect, get its target
 897          *
 898          * The target will be fetched from the redirect table if possible.
 899          * If this page doesn't have an entry there, call insertRedirect()
 900          * @return Title|null Title object, or null if this page is not a redirect
 901          */
 902         public function getRedirectTarget() {
 903                 if ( !$this->mTitle->isRedirect() ) {
 904                         return null;
 905                 }
 906
 907                 if ( $this->mRedirectTarget !== null ) {
 908                         return $this->mRedirectTarget;
 909                 }
 910
 911                 // Query the redirect table
 912                 $dbr = wfGetDB( DB_SLAVE );
 913                 $row = $dbr->selectRow( 'redirect',
 914                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 915                         array( 'rd_from' => $this->getId() ),
 916                         __METHOD__
 917                 );
 918
 919                 // rd_fragment and rd_interwiki were added later, populate them if empty
 920                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 921                         $this->mRedirectTarget = Title::makeTitle(
 922                                 $row->rd_namespace, $row->rd_title,
 923                                 $row->rd_fragment, $row->rd_interwiki );
 924                         return $this->mRedirectTarget;
 925                 }
 926
 927                 // This page doesn't have an entry in the redirect table
 928                 $this->mRedirectTarget = $this->insertRedirect();
 929                 return $this->mRedirectTarget;
 930         }
 931
 932         /**
 933          * Insert an entry for this page into the redirect table.
 934          *
 935          * Don't call this function directly unless you know what you're doing.
 936          * @return Title|null Title object or null if not a redirect
 937          */
 938         public function insertRedirect() {
 939                 // recurse through to only get the final target
 940                 $content = $this->getContent();
 941                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 942                 if ( !$retval ) {
 943                         return null;
 944                 }
 945                 $this->insertRedirectEntry( $retval );
 946                 return $retval;
 947         }
 948
 949         /**
 950          * Insert or update the redirect table entry for this page to indicate
 951          * it redirects to $rt .
 952          * @param Title $rt Redirect target
 953          */
 954         public function insertRedirectEntry( $rt ) {
 955                 $dbw = wfGetDB( DB_MASTER );
 956                 $dbw->replace( 'redirect', array( 'rd_from' ),
 957                         array(
 958                                 'rd_from' => $this->getId(),
 959                                 'rd_namespace' => $rt->getNamespace(),
 960                                 'rd_title' => $rt->getDBkey(),
 961                                 'rd_fragment' => $rt->getFragment(),
 962                                 'rd_interwiki' => $rt->getInterwiki(),
 963                         ),
 964                         __METHOD__
 965                 );
 966         }
 967
 968         /**
 969          * Get the Title object or URL this page redirects to
 970          *
 971          * @return bool|Title|string false, Title of in-wiki target, or string with URL
 972          */
 973         public function followRedirect() {
 974                 return $this->getRedirectURL( $this->getRedirectTarget() );
 975         }
 976
 977         /**
 978          * Get the Title object or URL to use for a redirect. We use Title
 979          * objects for same-wiki, non-special redirects and URLs for everything
 980          * else.
 981          * @param Title $rt Redirect target
 982          * @return bool|Title|string false, Title object of local target, or string with URL
 983          */
 984         public function getRedirectURL( $rt ) {
 985                 if ( !$rt ) {
 986                         return false;
 987                 }
 988
 989                 if ( $rt->isExternal() ) {
 990                         if ( $rt->isLocal() ) {
 991                                 // Offsite wikis need an HTTP redirect.
 992                                 //
 993                                 // This can be hard to reverse and may produce loops,
 994                                 // so they may be disabled in the site configuration.
 995                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 996                                 return $rt->getFullURL( array( 'rdfrom' => $source ) );
 997                         } else {
 998                                 // External pages pages without "local" bit set are not valid
 999                                 // redirect targets
1000                                 return false;
1001                         }
1002                 }
1003
1004                 if ( $rt->isSpecialPage() ) {
1005                         // Gotta handle redirects to special pages differently:
1006                         // Fill the HTTP response "Location" header and ignore
1007                         // the rest of the page we're on.
1008                         //
1009                         // Some pages are not valid targets
1010                         if ( $rt->isValidRedirectTarget() ) {
1011                                 return $rt->getFullURL();
1012                         } else {
1013                                 return false;
1014                         }
1015                 }
1016
1017                 return $rt;
1018         }
1019
1020         /**
1021          * Get a list of users who have edited this article, not including the user who made
1022          * the most recent revision, which you can get from $article->getUser() if you want it
1023          * @return UserArrayFromResult
1024          */
1025         public function getContributors() {
1026                 // @todo FIXME: This is expensive; cache this info somewhere.
1027
1028                 $dbr = wfGetDB( DB_SLAVE );
1029
1030                 if ( $dbr->implicitGroupby() ) {
1031                         $realNameField = 'user_real_name';
1032                 } else {
1033                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1034                 }
1035
1036                 $tables = array( 'revision', 'user' );
1037
1038                 $fields = array(
1039                         'user_id' => 'rev_user',
1040                         'user_name' => 'rev_user_text',
1041                         $realNameField,
1042                         'timestamp' => 'MAX(rev_timestamp)',
1043                 );
1044
1045                 $conds = array( 'rev_page' => $this->getId() );
1046
1047                 // The user who made the top revision gets credited as "this page was last edited by
1048                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1049                 $user = $this->getUser();
1050                 if ( $user ) {
1051                         $conds[] = "rev_user != $user";
1052                 } else {
1053                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1054                 }
1055
1056                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
1057
1058                 $jconds = array(
1059                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
1060                 );
1061
1062                 $options = array(
1063                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
1064                         'ORDER BY' => 'timestamp DESC',
1065                 );
1066
1067                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1068                 return new UserArrayFromResult( $res );
1069         }
1070
1071         /**
1072          * Get the last N authors
1073          * @param int $num Number of revisions to get
1074          * @param int|string $revLatest The latest rev_id, selected from the master (optional)
1075          * @return array Array of authors, duplicates not removed
1076          */
1077         public function getLastNAuthors( $num, $revLatest = 0 ) {
1078                 wfProfileIn( __METHOD__ );
1079                 // First try the slave
1080                 // If that doesn't have the latest revision, try the master
1081                 $continue = 2;
1082                 $db = wfGetDB( DB_SLAVE );
1083
1084                 do {
1085                         $res = $db->select( array( 'page', 'revision' ),
1086                                 array( 'rev_id', 'rev_user_text' ),
1087                                 array(
1088                                         'page_namespace' => $this->mTitle->getNamespace(),
1089                                         'page_title' => $this->mTitle->getDBkey(),
1090                                         'rev_page = page_id'
1091                                 ), __METHOD__,
1092                                 array(
1093                                         'ORDER BY' => 'rev_timestamp DESC',
1094                                         'LIMIT' => $num
1095                                 )
1096                         );
1097
1098                         if ( !$res ) {
1099                                 wfProfileOut( __METHOD__ );
1100                                 return array();
1101                         }
1102
1103                         $row = $db->fetchObject( $res );
1104
1105                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1106                                 $db = wfGetDB( DB_MASTER );
1107                                 $continue--;
1108                         } else {
1109                                 $continue = 0;
1110                         }
1111                 } while ( $continue );
1112
1113                 $authors = array( $row->rev_user_text );
1114
1115                 foreach ( $res as $row ) {
1116                         $authors[] = $row->rev_user_text;
1117                 }
1118
1119                 wfProfileOut( __METHOD__ );
1120                 return $authors;
1121         }
1122
1123         /**
1124          * Should the parser cache be used?
1125          *
1126          * @param ParserOptions $parserOptions ParserOptions to check
1127          * @param int $oldid
1128          * @return bool
1129          */
1130         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1131                 global $wgEnableParserCache;
1132
1133                 return $wgEnableParserCache
1134                         && $parserOptions->getStubThreshold() == 0
1135                         && $this->exists()
1136                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1137                         && $this->getContentHandler()->isParserCacheSupported();
1138         }
1139
1140         /**
1141          * Get a ParserOutput for the given ParserOptions and revision ID.
1142          * The parser cache will be used if possible.
1143          *
1144          * @since 1.19
1145          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1146          * @param null|int $oldid Revision ID to get the text from, passing null or 0 will
1147          *   get the current revision (default value)
1148          *
1149          * @return ParserOutput|bool ParserOutput or false if the revision was not found
1150          */
1151         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1152                 wfProfileIn( __METHOD__ );
1153
1154                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1155                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1156                 if ( $parserOptions->getStubThreshold() ) {
1157                         wfIncrStats( 'pcache_miss_stub' );
1158                 }
1159
1160                 if ( $useParserCache ) {
1161                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1162                         if ( $parserOutput !== false ) {
1163                                 wfProfileOut( __METHOD__ );
1164                                 return $parserOutput;
1165                         }
1166                 }
1167
1168                 if ( $oldid === null || $oldid === 0 ) {
1169                         $oldid = $this->getLatest();
1170                 }
1171
1172                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1173                 $pool->execute();
1174
1175                 wfProfileOut( __METHOD__ );
1176
1177                 return $pool->getParserOutput();
1178         }
1179
1180         /**
1181          * Do standard deferred updates after page view (existing or missing page)
1182          * @param User $user The relevant user
1183          * @param int $oldid The revision id being viewed. If not given or 0, latest revision is assumed.
1184          */
1185         public function doViewUpdates( User $user, $oldid = 0 ) {
1186                 global $wgDisableCounters;
1187                 if ( wfReadOnly() ) {
1188                         return;
1189                 }
1190
1191                 // Don't update page view counters on views from bot users (bug 14044)
1192                 if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->exists() ) {
1193                         DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
1194                         DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
1195                 }
1196
1197                 // Update newtalk / watchlist notification status
1198                 $user->clearNotification( $this->mTitle, $oldid );
1199         }
1200
1201         /**
1202          * Perform the actions of a page purging
1203          * @return bool
1204          */
1205         public function doPurge() {
1206                 global $wgUseSquid;
1207
1208                 if ( !wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
1209                         return false;
1210                 }
1211
1212                 // Invalidate the cache
1213                 $this->mTitle->invalidateCache();
1214
1215                 if ( $wgUseSquid ) {
1216                         // Commit the transaction before the purge is sent
1217                         $dbw = wfGetDB( DB_MASTER );
1218                         $dbw->commit( __METHOD__ );
1219
1220                         // Send purge
1221                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1222                         $update->doUpdate();
1223                 }
1224
1225                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1226                         // @todo move this logic to MessageCache
1227
1228                         if ( $this->exists() ) {
1229                                 // NOTE: use transclusion text for messages.
1230                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1231
1232                                 $content = $this->getContent();
1233                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1234
1235                                 if ( $text === null ) {
1236                                         $text = false;
1237                                 }
1238                         } else {
1239                                 $text = false;
1240                         }
1241
1242                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1243                 }
1244                 return true;
1245         }
1246
1247         /**
1248          * Insert a new empty page record for this article.
1249          * This *must* be followed up by creating a revision
1250          * and running $this->updateRevisionOn( ... );
1251          * or else the record will be left in a funky state.
1252          * Best if all done inside a transaction.
1253          *
1254          * @param DatabaseBase $dbw
1255          * @return int The newly created page_id key, or false if the title already existed
1256          */
1257         public function insertOn( $dbw ) {
1258                 wfProfileIn( __METHOD__ );
1259
1260                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1261                 $dbw->insert( 'page', array(
1262                         'page_id'           => $page_id,
1263                         'page_namespace'    => $this->mTitle->getNamespace(),
1264                         'page_title'        => $this->mTitle->getDBkey(),
1265                         'page_counter'      => 0,
1266                         'page_restrictions' => '',
1267                         'page_is_redirect'  => 0, // Will set this shortly...
1268                         'page_is_new'       => 1,
1269                         'page_random'       => wfRandom(),
1270                         'page_touched'      => $dbw->timestamp(),
1271                         'page_latest'       => 0, // Fill this in shortly...
1272                         'page_len'          => 0, // Fill this in shortly...
1273                 ), __METHOD__, 'IGNORE' );
1274
1275                 $affected = $dbw->affectedRows();
1276
1277                 if ( $affected ) {
1278                         $newid = $dbw->insertId();
1279                         $this->mId = $newid;
1280                         $this->mTitle->resetArticleID( $newid );
1281                 }
1282                 wfProfileOut( __METHOD__ );
1283
1284                 return $affected ? $newid : false;
1285         }
1286
1287         /**
1288          * Update the page record to point to a newly saved revision.
1289          *
1290          * @param DatabaseBase $dbw
1291          * @param Revision $revision For ID number, and text used to set
1292          *   length and redirect status fields
1293          * @param int $lastRevision If given, will not overwrite the page field
1294          *   when different from the currently set value.
1295          *   Giving 0 indicates the new page flag should be set on.
1296          * @param bool $lastRevIsRedirect If given, will optimize adding and
1297          *   removing rows in redirect table.
1298          * @return bool true on success, false on failure
1299          */
1300         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1301                 $lastRevIsRedirect = null
1302         ) {
1303                 global $wgContentHandlerUseDB;
1304
1305                 wfProfileIn( __METHOD__ );
1306
1307                 $content = $revision->getContent();
1308                 $len = $content ? $content->getSize() : 0;
1309                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1310
1311                 $conditions = array( 'page_id' => $this->getId() );
1312
1313                 if ( !is_null( $lastRevision ) ) {
1314                         // An extra check against threads stepping on each other
1315                         $conditions['page_latest'] = $lastRevision;
1316                 }
1317
1318                 $now = wfTimestampNow();
1319                 $row = array( /* SET */
1320                         'page_latest'      => $revision->getId(),
1321                         'page_touched'     => $dbw->timestamp( $now ),
1322                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1323                         'page_is_redirect' => $rt !== null ? 1 : 0,
1324                         'page_len'         => $len,
1325                 );
1326
1327                 if ( $wgContentHandlerUseDB ) {
1328                         $row['page_content_model'] = $revision->getContentModel();
1329                 }
1330
1331                 $dbw->update( 'page',
1332                         $row,
1333                         $conditions,
1334                         __METHOD__ );
1335
1336                 $result = $dbw->affectedRows() > 0;
1337                 if ( $result ) {
1338                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1339                         $this->setLastEdit( $revision );
1340                         $this->setCachedLastEditTime( $now );
1341                         $this->mLatest = $revision->getId();
1342                         $this->mIsRedirect = (bool)$rt;
1343                         // Update the LinkCache.
1344                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect,
1345                                                                                                         $this->mLatest, $revision->getContentModel() );
1346                 }
1347
1348                 wfProfileOut( __METHOD__ );
1349                 return $result;
1350         }
1351
1352         /**
1353          * Add row to the redirect table if this is a redirect, remove otherwise.
1354          *
1355          * @param DatabaseBase $dbw
1356          * @param Title $redirectTitle Title object pointing to the redirect target,
1357          *   or NULL if this is not a redirect
1358          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1359          *   removing rows in redirect table.
1360          * @return bool true on success, false on failure
1361          * @private
1362          */
1363         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1364                 // Always update redirects (target link might have changed)
1365                 // Update/Insert if we don't know if the last revision was a redirect or not
1366                 // Delete if changing from redirect to non-redirect
1367                 $isRedirect = !is_null( $redirectTitle );
1368
1369                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1370                         return true;
1371                 }
1372
1373                 wfProfileIn( __METHOD__ );
1374                 if ( $isRedirect ) {
1375                         $this->insertRedirectEntry( $redirectTitle );
1376                 } else {
1377                         // This is not a redirect, remove row from redirect table
1378                         $where = array( 'rd_from' => $this->getId() );
1379                         $dbw->delete( 'redirect', $where, __METHOD__ );
1380                 }
1381
1382                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1383                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1384                 }
1385                 wfProfileOut( __METHOD__ );
1386
1387                 return ( $dbw->affectedRows() != 0 );
1388         }
1389
1390         /**
1391          * If the given revision is newer than the currently set page_latest,
1392          * update the page record. Otherwise, do nothing.
1393          *
1394          * @deprecated since 1.24, use updateRevisionOn instead
1395          *
1396          * @param DatabaseBase $dbw
1397          * @param Revision $revision
1398          * @return bool
1399          */
1400         public function updateIfNewerOn( $dbw, $revision ) {
1401                 wfProfileIn( __METHOD__ );
1402
1403                 $row = $dbw->selectRow(
1404                         array( 'revision', 'page' ),
1405                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1406                         array(
1407                                 'page_id' => $this->getId(),
1408                                 'page_latest=rev_id' ),
1409                         __METHOD__ );
1410
1411                 if ( $row ) {
1412                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1413                                 wfProfileOut( __METHOD__ );
1414                                 return false;
1415                         }
1416                         $prev = $row->rev_id;
1417                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1418                 } else {
1419                         // No or missing previous revision; mark the page as new
1420                         $prev = 0;
1421                         $lastRevIsRedirect = null;
1422                 }
1423
1424                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1425
1426                 wfProfileOut( __METHOD__ );
1427                 return $ret;
1428         }
1429
1430         /**
1431          * Get the content that needs to be saved in order to undo all revisions
1432          * between $undo and $undoafter. Revisions must belong to the same page,
1433          * must exist and must not be deleted
1434          * @param Revision $undo
1435          * @param Revision $undoafter Must be an earlier revision than $undo
1436          * @return mixed string on success, false on failure
1437          * @since 1.21
1438          * Before we had the Content object, this was done in getUndoText
1439          */
1440         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1441                 $handler = $undo->getContentHandler();
1442                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1443         }
1444
1445         /**
1446          * Get the text that needs to be saved in order to undo all revisions
1447          * between $undo and $undoafter. Revisions must belong to the same page,
1448          * must exist and must not be deleted
1449          * @param Revision $undo
1450          * @param Revision $undoafter Must be an earlier revision than $undo
1451          * @return string|bool string on success, false on failure
1452          * @deprecated since 1.21: use ContentHandler::getUndoContent() instead.
1453          */
1454         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1455                 ContentHandler::deprecated( __METHOD__, '1.21' );
1456
1457                 $this->loadLastEdit();
1458
1459                 if ( $this->mLastRevision ) {
1460                         if ( is_null( $undoafter ) ) {
1461                                 $undoafter = $undo->getPrevious();
1462                         }
1463
1464                         $handler = $this->getContentHandler();
1465                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1466
1467                         if ( !$undone ) {
1468                                 return false;
1469                         } else {
1470                                 return ContentHandler::getContentText( $undone );
1471                         }
1472                 }
1473
1474                 return false;
1475         }
1476
1477         /**
1478          * @param string|number|null|bool $sectionId Section identifier as a number or string
1479          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1480          * or 'new' for a new section.
1481          * @param string $text New text of the section.
1482          * @param string $sectionTitle New section's subject, only if $section is "new".
1483          * @param string $edittime Revision timestamp or null to use the current revision.
1484          *
1485          * @throws MWException
1486          * @return string New complete article text, or null if error.
1487          *
1488          * @deprecated since 1.21, use replaceSectionAtRev() instead
1489          */
1490         public function replaceSection( $sectionId, $text, $sectionTitle = '',
1491                 $edittime = null
1492         ) {
1493                 ContentHandler::deprecated( __METHOD__, '1.21' );
1494
1495                 //NOTE: keep condition in sync with condition in replaceSectionContent!
1496                 if ( strval( $sectionId ) === '' ) {
1497                         // Whole-page edit; let the whole text through
1498                         return $text;
1499                 }
1500
1501                 if ( !$this->supportsSections() ) {
1502                         throw new MWException( "sections not supported for content model " .
1503                                 $this->getContentHandler()->getModelID() );
1504                 }
1505
1506                 // could even make section title, but that's not required.
1507                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() );
1508
1509                 $newContent = $this->replaceSectionContent( $sectionId, $sectionContent, $sectionTitle,
1510                         $edittime );
1511
1512                 return ContentHandler::getContentText( $newContent );
1513         }
1514
1515         /**
1516          * Returns true if this page's content model supports sections.
1517          *
1518          * @return bool
1519          *
1520          * @todo The skin should check this and not offer section functionality if
1521          *   sections are not supported.
1522          * @todo The EditPage should check this and not offer section functionality
1523          *   if sections are not supported.
1524          */
1525         public function supportsSections() {
1526                 return $this->getContentHandler()->supportsSections();
1527         }
1528
1529         /**
1530          * @param string|number|null|bool $sectionId Section identifier as a number or string
1531          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1532          * or 'new' for a new section.
1533          * @param Content $sectionContent New content of the section.
1534          * @param string $sectionTitle New section's subject, only if $section is "new".
1535          * @param string $edittime Revision timestamp or null to use the current revision.
1536          *
1537          * @throws MWException
1538          * @return Content New complete article content, or null if error.
1539          *
1540          * @since 1.21
1541          * @deprecated since 1.24, use replaceSectionAtRev instead
1542          */
1543         public function replaceSectionContent( $sectionId, Content $sectionContent, $sectionTitle = '',
1544                 $edittime = null ) {
1545                 wfProfileIn( __METHOD__ );
1546
1547                 $baseRevId = null;
1548                 if ( $edittime && $sectionId !== 'new' ) {
1549                         $dbw = wfGetDB( DB_MASTER );
1550                         $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1551                         if ( $rev ) {
1552                                 $baseRevId = $rev->getId();
1553                         }
1554                 }
1555
1556                 wfProfileOut( __METHOD__ );
1557                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1558         }
1559
1560         /**
1561          * @param string|number|null|bool $sectionId Section identifier as a number or string
1562          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1563          * or 'new' for a new section.
1564          * @param Content $sectionContent New content of the section.
1565          * @param string $sectionTitle New section's subject, only if $section is "new".
1566          * @param string $baseRevId integer|null
1567          *
1568          * @throws MWException
1569          * @return Content New complete article content, or null if error.
1570          *
1571          * @since 1.24
1572          */
1573         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1574                 $sectionTitle = '', $baseRevId = null
1575         ) {
1576                 wfProfileIn( __METHOD__ );
1577
1578                 if ( strval( $sectionId ) === '' ) {
1579                         // Whole-page edit; let the whole text through
1580                         $newContent = $sectionContent;
1581                 } else {
1582                         if ( !$this->supportsSections() ) {
1583                                 wfProfileOut( __METHOD__ );
1584                                 throw new MWException( "sections not supported for content model " .
1585                                         $this->getContentHandler()->getModelID() );
1586                         }
1587
1588                         // Bug 30711: always use current version when adding a new section
1589                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1590                                 $oldContent = $this->getContent();
1591                         } else {
1592                                 // TODO: try DB_SLAVE first
1593                                 $dbw = wfGetDB( DB_MASTER );
1594                                 $rev = Revision::loadFromId( $dbw, $baseRevId );
1595
1596                                 if ( !$rev ) {
1597                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1598                                                 $this->getId() . "; section: $sectionId)\n" );
1599                                         wfProfileOut( __METHOD__ );
1600                                         return null;
1601                                 }
1602
1603                                 $oldContent = $rev->getContent();
1604                         }
1605
1606                         if ( ! $oldContent ) {
1607                                 wfDebug( __METHOD__ . ": no page text\n" );
1608                                 wfProfileOut( __METHOD__ );
1609                                 return null;
1610                         }
1611
1612                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1613                 }
1614
1615                 wfProfileOut( __METHOD__ );
1616                 return $newContent;
1617         }
1618
1619         /**
1620          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1621          * @param int $flags
1622          * @return int Updated $flags
1623          */
1624         public function checkFlags( $flags ) {
1625                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1626                         if ( $this->exists() ) {
1627                                 $flags |= EDIT_UPDATE;
1628                         } else {
1629                                 $flags |= EDIT_NEW;
1630                         }
1631                 }
1632
1633                 return $flags;
1634         }
1635
1636         /**
1637          * Change an existing article or create a new article. Updates RC and all necessary caches,
1638          * optionally via the deferred update array.
1639          *
1640          * @param string $text New text
1641          * @param string $summary Edit summary
1642          * @param int $flags Bitfield:
1643          *      EDIT_NEW
1644          *          Article is known or assumed to be non-existent, create a new one
1645          *      EDIT_UPDATE
1646          *          Article is known or assumed to be pre-existing, update it
1647          *      EDIT_MINOR
1648          *          Mark this edit minor, if the user is allowed to do so
1649          *      EDIT_SUPPRESS_RC
1650          *          Do not log the change in recentchanges
1651          *      EDIT_FORCE_BOT
1652          *          Mark the edit a "bot" edit regardless of user rights
1653          *      EDIT_DEFER_UPDATES
1654          *          Defer some of the updates until the end of index.php
1655          *      EDIT_AUTOSUMMARY
1656          *          Fill in blank summaries with generated text where possible
1657          *
1658          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1659          * article will be detected. If EDIT_UPDATE is specified and the article
1660          * doesn't exist, the function will return an edit-gone-missing error. If
1661          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1662          * error will be returned. These two conditions are also possible with
1663          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1664          *
1665          * @param bool|int $baseRevId The revision ID this edit was based off, if any
1666          * @param User $user The user doing the edit
1667          *
1668          * @throws MWException
1669          * @return Status object. Possible errors:
1670          *   edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1671          *     set the fatal flag of $status
1672          *   edit-gone-missing: In update mode, but the article didn't exist.
1673          *   edit-conflict: In update mode, the article changed unexpectedly.
1674          *   edit-no-change: Warning that the text was the same as before.
1675          *   edit-already-exists: In creation mode, but the article already exists.
1676          *
1677          * Extensions may define additional errors.
1678          *
1679          * $return->value will contain an associative array with members as follows:
1680          *     new: Boolean indicating if the function attempted to create a new article.
1681          *     revision: The revision object for the inserted revision, or null.
1682          *
1683          * Compatibility note: this function previously returned a boolean value
1684          * indicating success/failure
1685          *
1686          * @deprecated since 1.21: use doEditContent() instead.
1687          */
1688         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1689                 ContentHandler::deprecated( __METHOD__, '1.21' );
1690
1691                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1692
1693                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1694         }
1695
1696         /**
1697          * Change an existing article or create a new article. Updates RC and all necessary caches,
1698          * optionally via the deferred update array.
1699          *
1700          * @param Content $content New content
1701          * @param string $summary Edit summary
1702          * @param int $flags Bitfield:
1703          *      EDIT_NEW
1704          *          Article is known or assumed to be non-existent, create a new one
1705          *      EDIT_UPDATE
1706          *          Article is known or assumed to be pre-existing, update it
1707          *      EDIT_MINOR
1708          *          Mark this edit minor, if the user is allowed to do so
1709          *      EDIT_SUPPRESS_RC
1710          *          Do not log the change in recentchanges
1711          *      EDIT_FORCE_BOT
1712          *          Mark the edit a "bot" edit regardless of user rights
1713          *      EDIT_DEFER_UPDATES
1714          *          Defer some of the updates until the end of index.php
1715          *      EDIT_AUTOSUMMARY
1716          *          Fill in blank summaries with generated text where possible
1717          *
1718          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1719          * article will be detected. If EDIT_UPDATE is specified and the article
1720          * doesn't exist, the function will return an edit-gone-missing error. If
1721          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1722          * error will be returned. These two conditions are also possible with
1723          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1724          *
1725          * @param bool|int $baseRevId The revision ID this edit was based off, if any
1726          * @param User $user The user doing the edit
1727          * @param string $serialisation_format Format for storing the content in the
1728          *   database.
1729          *
1730          * @throws MWException
1731          * @return Status object. Possible errors:
1732          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1733          *       set the fatal flag of $status.
1734          *     edit-gone-missing: In update mode, but the article didn't exist.
1735          *     edit-conflict: In update mode, the article changed unexpectedly.
1736          *     edit-no-change: Warning that the text was the same as before.
1737          *     edit-already-exists: In creation mode, but the article already exists.
1738          *
1739          *  Extensions may define additional errors.
1740          *
1741          *  $return->value will contain an associative array with members as follows:
1742          *     new: Boolean indicating if the function attempted to create a new article.
1743          *     revision: The revision object for the inserted revision, or null.
1744          *
1745          * @since 1.21
1746          */
1747         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1748                 User $user = null, $serialisation_format = null
1749         ) {
1750                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1751
1752                 // Low-level sanity check
1753                 if ( $this->mTitle->getText() === '' ) {
1754                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1755                 }
1756
1757                 wfProfileIn( __METHOD__ );
1758
1759                 if ( !$content->getContentHandler()->canBeUsedOn( $this->getTitle() ) ) {
1760                         wfProfileOut( __METHOD__ );
1761                         return Status::newFatal( 'content-not-allowed-here',
1762                                 ContentHandler::getLocalizedName( $content->getModel() ),
1763                                 $this->getTitle()->getPrefixedText() );
1764                 }
1765
1766                 $user = is_null( $user ) ? $wgUser : $user;
1767                 $status = Status::newGood( array() );
1768
1769                 // Load the data from the master database if needed.
1770                 // The caller may already loaded it from the master or even loaded it using
1771                 // SELECT FOR UPDATE, so do not override that using clear().
1772                 $this->loadPageData( 'fromdbmaster' );
1773
1774                 $flags = $this->checkFlags( $flags );
1775
1776                 // handle hook
1777                 $hook_args = array( &$this, &$user, &$content, &$summary,
1778                                                         $flags & EDIT_MINOR, null, null, &$flags, &$status );
1779
1780                 if ( !wfRunHooks( 'PageContentSave', $hook_args )
1781                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args ) ) {
1782
1783                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1784
1785                         if ( $status->isOK() ) {
1786                                 $status->fatal( 'edit-hook-aborted' );
1787                         }
1788
1789                         wfProfileOut( __METHOD__ );
1790                         return $status;
1791                 }
1792
1793                 // Silently ignore EDIT_MINOR if not allowed
1794                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1795                 $bot = $flags & EDIT_FORCE_BOT;
1796
1797                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1798
1799                 $oldsize = $old_content ? $old_content->getSize() : 0;
1800                 $oldid = $this->getLatest();
1801                 $oldIsRedirect = $this->isRedirect();
1802                 $oldcountable = $this->isCountable();
1803
1804                 $handler = $content->getContentHandler();
1805
1806                 // Provide autosummaries if one is not provided and autosummaries are enabled.
1807                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1808                         if ( !$old_content ) {
1809                                 $old_content = null;
1810                         }
1811                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1812                 }
1813
1814                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialisation_format );
1815                 $serialized = $editInfo->pst;
1816
1817                 /**
1818                  * @var Content $content
1819                  */
1820                 $content = $editInfo->pstContent;
1821                 $newsize = $content->getSize();
1822
1823                 $dbw = wfGetDB( DB_MASTER );
1824                 $now = wfTimestampNow();
1825                 $this->mTimestamp = $now;
1826
1827                 if ( $flags & EDIT_UPDATE ) {
1828                         // Update article, but only if changed.
1829                         $status->value['new'] = false;
1830
1831                         if ( !$oldid ) {
1832                                 // Article gone missing
1833                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1834                                 $status->fatal( 'edit-gone-missing' );
1835
1836                                 wfProfileOut( __METHOD__ );
1837                                 return $status;
1838                         } elseif ( !$old_content ) {
1839                                 // Sanity check for bug 37225
1840                                 wfProfileOut( __METHOD__ );
1841                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1842                         }
1843
1844                         $revision = new Revision( array(
1845                                 'page'       => $this->getId(),
1846                                 'title'      => $this->getTitle(), // for determining the default content model
1847                                 'comment'    => $summary,
1848                                 'minor_edit' => $isminor,
1849                                 'text'       => $serialized,
1850                                 'len'        => $newsize,
1851                                 'parent_id'  => $oldid,
1852                                 'user'       => $user->getId(),
1853                                 'user_text'  => $user->getName(),
1854                                 'timestamp'  => $now,
1855                                 'content_model' => $content->getModel(),
1856                                 'content_format' => $serialisation_format,
1857                         ) ); // XXX: pass content object?!
1858
1859                         $changed = !$content->equals( $old_content );
1860
1861                         if ( $changed ) {
1862                                 if ( !$content->isValid() ) {
1863                                         wfProfileOut( __METHOD__ );
1864                                         throw new MWException( "New content failed validity check!" );
1865                                 }
1866
1867                                 $dbw->begin( __METHOD__ );
1868                                 try {
1869
1870                                         $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1871                                         $status->merge( $prepStatus );
1872
1873                                         if ( !$status->isOK() ) {
1874                                                 $dbw->rollback( __METHOD__ );
1875
1876                                                 wfProfileOut( __METHOD__ );
1877                                                 return $status;
1878                                         }
1879                                         $revisionId = $revision->insertOn( $dbw );
1880
1881                                         // Update page
1882                                         //
1883                                         // We check for conflicts by comparing $oldid with the current latest revision ID.
1884                                         $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1885
1886                                         if ( !$ok ) {
1887                                                 // Belated edit conflict! Run away!!
1888                                                 $status->fatal( 'edit-conflict' );
1889
1890                                                 $dbw->rollback( __METHOD__ );
1891
1892                                                 wfProfileOut( __METHOD__ );
1893                                                 return $status;
1894                                         }
1895
1896                                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1897                                         // Update recentchanges
1898                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1899                                                 // Mark as patrolled if the user can do so
1900                                                 $patrolled = $wgUseRCPatrol && !count(
1901                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1902                                                 // Add RC row to the DB
1903                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1904                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1905                                                         $revisionId, $patrolled
1906                                                 );
1907
1908                                                 // Log auto-patrolled edits
1909                                                 if ( $patrolled ) {
1910                                                         PatrolLog::record( $rc, true, $user );
1911                                                 }
1912                                         }
1913                                         $user->incEditCount();
1914                                 } catch ( MWException $e ) {
1915                                         $dbw->rollback( __METHOD__ );
1916                                         // Question: Would it perhaps be better if this method turned all
1917                                         // exceptions into $status's?
1918                                         throw $e;
1919                                 }
1920                                 $dbw->commit( __METHOD__ );
1921                         } else {
1922                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1923                                 // related variables correctly
1924                                 $revision->setId( $this->getLatest() );
1925                         }
1926
1927                         // Update links tables, site stats, etc.
1928                         $this->doEditUpdates(
1929                                 $revision,
1930                                 $user,
1931                                 array(
1932                                         'changed' => $changed,
1933                                         'oldcountable' => $oldcountable
1934                                 )
1935                         );
1936
1937                         if ( !$changed ) {
1938                                 $status->warning( 'edit-no-change' );
1939                                 $revision = null;
1940                                 // Update page_touched, this is usually implicit in the page update
1941                                 // Other cache updates are done in onArticleEdit()
1942                                 $this->mTitle->invalidateCache();
1943                         }
1944                 } else {
1945                         // Create new article
1946                         $status->value['new'] = true;
1947
1948                         $dbw->begin( __METHOD__ );
1949                         try {
1950
1951                                 $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1952                                 $status->merge( $prepStatus );
1953
1954                                 if ( !$status->isOK() ) {
1955                                         $dbw->rollback( __METHOD__ );
1956
1957                                         wfProfileOut( __METHOD__ );
1958                                         return $status;
1959                                 }
1960
1961                                 $status->merge( $prepStatus );
1962
1963                                 // Add the page record; stake our claim on this title!
1964                                 // This will return false if the article already exists
1965                                 $newid = $this->insertOn( $dbw );
1966
1967                                 if ( $newid === false ) {
1968                                         $dbw->rollback( __METHOD__ );
1969                                         $status->fatal( 'edit-already-exists' );
1970
1971                                         wfProfileOut( __METHOD__ );
1972                                         return $status;
1973                                 }
1974
1975                                 // Save the revision text...
1976                                 $revision = new Revision( array(
1977                                         'page'       => $newid,
1978                                         'title'      => $this->getTitle(), // for determining the default content model
1979                                         'comment'    => $summary,
1980                                         'minor_edit' => $isminor,
1981                                         'text'       => $serialized,
1982                                         'len'        => $newsize,
1983                                         'user'       => $user->getId(),
1984                                         'user_text'  => $user->getName(),
1985                                         'timestamp'  => $now,
1986                                         'content_model' => $content->getModel(),
1987                                         'content_format' => $serialisation_format,
1988                                 ) );
1989                                 $revisionId = $revision->insertOn( $dbw );
1990
1991                                 // Bug 37225: use accessor to get the text as Revision may trim it
1992                                 $content = $revision->getContent(); // sanity; get normalized version
1993
1994                                 if ( $content ) {
1995                                         $newsize = $content->getSize();
1996                                 }
1997
1998                                 // Update the page record with revision data
1999                                 $this->updateRevisionOn( $dbw, $revision, 0 );
2000
2001                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2002
2003                                 // Update recentchanges
2004                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
2005                                         // Mark as patrolled if the user can do so
2006                                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
2007                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
2008                                         // Add RC row to the DB
2009                                         $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
2010                                                 '', $newsize, $revisionId, $patrolled );
2011
2012                                         // Log auto-patrolled edits
2013                                         if ( $patrolled ) {
2014                                                 PatrolLog::record( $rc, true, $user );
2015                                         }
2016                                 }
2017                                 $user->incEditCount();
2018
2019                         } catch ( MWException $e ) {
2020                                 $dbw->rollback( __METHOD__ );
2021                                 throw $e;
2022                         }
2023                         $dbw->commit( __METHOD__ );
2024
2025                         // Update links, etc.
2026                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
2027
2028                         $hook_args = array( &$this, &$user, $content, $summary,
2029                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision );
2030
2031                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $hook_args );
2032                         wfRunHooks( 'PageContentInsertComplete', $hook_args );
2033                 }
2034
2035                 // Do updates right now unless deferral was requested
2036                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2037                         DeferredUpdates::doUpdates();
2038                 }
2039
2040                 // Return the new revision (or null) to the caller
2041                 $status->value['revision'] = $revision;
2042
2043                 $hook_args = array( &$this, &$user, $content, $summary,
2044                                                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId );
2045
2046                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $hook_args );
2047                 wfRunHooks( 'PageContentSaveComplete', $hook_args );
2048
2049                 // Promote user to any groups they meet the criteria for
2050                 $user->addAutopromoteOnceGroups( 'onEdit' );
2051
2052                 wfProfileOut( __METHOD__ );
2053                 return $status;
2054         }
2055
2056         /**
2057          * Get parser options suitable for rendering the primary article wikitext
2058          *
2059          * @see ContentHandler::makeParserOptions
2060          *
2061          * @param IContextSource|User|string $context One of the following:
2062          *        - IContextSource: Use the User and the Language of the provided
2063          *          context
2064          *        - User: Use the provided User object and $wgLang for the language,
2065          *          so use an IContextSource object if possible.
2066          *        - 'canonical': Canonical options (anonymous user with default
2067          *          preferences and content language).
2068          * @return ParserOptions
2069          */
2070         public function makeParserOptions( $context ) {
2071                 $options = $this->getContentHandler()->makeParserOptions( $context );
2072
2073                 if ( $this->getTitle()->isConversionTable() ) {
2074                         // @todo ConversionTable should become a separate content model, so
2075                         // we don't need special cases like this one.
2076                         $options->disableContentConversion();
2077                 }
2078
2079                 return $options;
2080         }
2081
2082         /**
2083          * Prepare text which is about to be saved.
2084          * Returns a stdclass with source, pst and output members
2085          *
2086          * @deprecated since 1.21: use prepareContentForEdit instead.
2087          * @return object
2088          */
2089         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2090                 ContentHandler::deprecated( __METHOD__, '1.21' );
2091                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2092                 return $this->prepareContentForEdit( $content, $revid, $user );
2093         }
2094
2095         /**
2096          * Prepare content which is about to be saved.
2097          * Returns a stdclass with source, pst and output members
2098          *
2099          * @param Content $content
2100          * @param int|null $revid
2101          * @param User|null $user
2102          * @param string|null $serialization_format
2103          *
2104          * @return bool|object
2105          *
2106          * @since 1.21
2107          */
2108         public function prepareContentForEdit( Content $content, $revid = null, User $user = null,
2109                 $serialization_format = null
2110         ) {
2111                 global $wgContLang, $wgUser;
2112                 $user = is_null( $user ) ? $wgUser : $user;
2113                 //XXX: check $user->getId() here???
2114
2115                 // Use a sane default for $serialization_format, see bug 57026
2116                 if ( $serialization_format === null ) {
2117                         $serialization_format = $content->getContentHandler()->getDefaultFormat();
2118                 }
2119
2120                 if ( $this->mPreparedEdit
2121                         && $this->mPreparedEdit->newContent
2122                         && $this->mPreparedEdit->newContent->equals( $content )
2123                         && $this->mPreparedEdit->revid == $revid
2124                         && $this->mPreparedEdit->format == $serialization_format
2125                         // XXX: also check $user here?
2126                 ) {
2127                         // Already prepared
2128                         return $this->mPreparedEdit;
2129                 }
2130
2131                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2132                 wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
2133
2134                 $edit = (object)array();
2135                 $edit->revid = $revid;
2136                 $edit->timestamp = wfTimestampNow();
2137
2138                 $edit->pstContent = $content ? $content->preSaveTransform( $this->mTitle, $user, $popts ) : null;
2139
2140                 $edit->format = $serialization_format;
2141                 $edit->popts = $this->makeParserOptions( 'canonical' );
2142                 $edit->output = $edit->pstContent
2143                         ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2144                         : null;
2145
2146                 $edit->newContent = $content;
2147                 $edit->oldContent = $this->getContent( Revision::RAW );
2148
2149                 // NOTE: B/C for hooks! don't use these fields!
2150                 $edit->newText = $edit->newContent ? ContentHandler::getContentText( $edit->newContent ) : '';
2151                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
2152                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialization_format ) : '';
2153
2154                 $this->mPreparedEdit = $edit;
2155                 return $edit;
2156         }
2157
2158         /**
2159          * Do standard deferred updates after page edit.
2160          * Update links tables, site stats, search index and message cache.
2161          * Purges pages that include this page if the text was changed here.
2162          * Every 100th edit, prune the recent changes table.
2163          *
2164          * @param Revision $revision
2165          * @param User $user User object that did the revision
2166          * @param array $options Array of options, following indexes are used:
2167          * - changed: boolean, whether the revision changed the content (default true)
2168          * - created: boolean, whether the revision created the page (default false)
2169          * - oldcountable: boolean or null (default null):
2170          *   - boolean: whether the page was counted as an article before that
2171          *     revision, only used in changed is true and created is false
2172          *   - null: don't change the article count
2173          */
2174         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2175                 global $wgEnableParserCache;
2176
2177                 wfProfileIn( __METHOD__ );
2178
2179                 $options += array( 'changed' => true, 'created' => false, 'oldcountable' => null );
2180                 $content = $revision->getContent();
2181
2182                 // Parse the text
2183                 // Be careful not to do pre-save transform twice: $text is usually
2184                 // already pre-save transformed once.
2185                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2186                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2187                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
2188                 } else {
2189                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2190                         $editInfo = $this->mPreparedEdit;
2191                 }
2192
2193                 // Save it to the parser cache
2194                 if ( $wgEnableParserCache ) {
2195                         $parserCache = ParserCache::singleton();
2196                         $parserCache->save(
2197                                 $editInfo->output, $this, $editInfo->popts, $editInfo->timestamp, $editInfo->revid
2198                         );
2199                 }
2200
2201                 // Update the links tables and other secondary data
2202                 if ( $content ) {
2203                         $recursive = $options['changed']; // bug 50785
2204                         $updates = $content->getSecondaryDataUpdates(
2205                                 $this->getTitle(), null, $recursive, $editInfo->output );
2206                         DataUpdate::runUpdates( $updates );
2207                 }
2208
2209                 wfRunHooks( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2210
2211                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2212                         if ( 0 == mt_rand( 0, 99 ) ) {
2213                                 // Flush old entries from the `recentchanges` table; we do this on
2214                                 // random requests so as to avoid an increase in writes for no good reason
2215                                 RecentChange::purgeExpiredChanges();
2216                         }
2217                 }
2218
2219                 if ( !$this->exists() ) {
2220                         wfProfileOut( __METHOD__ );
2221                         return;
2222                 }
2223
2224                 $id = $this->getId();
2225                 $title = $this->mTitle->getPrefixedDBkey();
2226                 $shortTitle = $this->mTitle->getDBkey();
2227
2228                 if ( !$options['changed'] ) {
2229                         $good = 0;
2230                 } elseif ( $options['created'] ) {
2231                         $good = (int)$this->isCountable( $editInfo );
2232                 } elseif ( $options['oldcountable'] !== null ) {
2233                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2234                 } else {
2235                         $good = 0;
2236                 }
2237                 $edits = $options['changed'] ? 1 : 0;
2238                 $total = $options['created'] ? 1 : 0;
2239
2240                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2241                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2242
2243                 // If this is another user's talk page, update newtalk.
2244                 // Don't do this if $options['changed'] = false (null-edits) nor if
2245                 // it's a minor edit and the user doesn't want notifications for those.
2246                 if ( $options['changed']
2247                         && $this->mTitle->getNamespace() == NS_USER_TALK
2248                         && $shortTitle != $user->getTitleKey()
2249                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2250                 ) {
2251                         $recipient = User::newFromName( $shortTitle, false );
2252                         if ( !$recipient ) {
2253                                 wfDebug( __METHOD__ . ": invalid username\n" );
2254                         } else {
2255                                 // Allow extensions to prevent user notification when a new message is added to their talk page
2256                                 if ( wfRunHooks( 'ArticleEditUpdateNewTalk', array( &$this, $recipient ) ) ) {
2257                                         if ( User::isIP( $shortTitle ) ) {
2258                                                 // An anonymous user
2259                                                 $recipient->setNewtalk( true, $revision );
2260                                         } elseif ( $recipient->isLoggedIn() ) {
2261                                                 $recipient->setNewtalk( true, $revision );
2262                                         } else {
2263                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2264                                         }
2265                                 }
2266                         }
2267                 }
2268
2269                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2270                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2271                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2272                         if ( $msgtext === false || $msgtext === null ) {
2273                                 $msgtext = '';
2274                         }
2275
2276                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2277                 }
2278
2279                 if ( $options['created'] ) {
2280                         self::onArticleCreate( $this->mTitle );
2281                 } elseif ( $options['changed'] ) { // bug 50785
2282                         self::onArticleEdit( $this->mTitle );
2283                 }
2284
2285                 wfProfileOut( __METHOD__ );
2286         }
2287
2288         /**
2289          * Edit an article without doing all that other stuff
2290          * The article must already exist; link tables etc
2291          * are not updated, caches are not flushed.
2292          *
2293          * @param string $text Text submitted
2294          * @param User $user The relevant user
2295          * @param string $comment Comment submitted
2296          * @param bool $minor Whereas it's a minor modification
2297          *
2298          * @deprecated since 1.21, use doEditContent() instead.
2299          */
2300         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2301                 ContentHandler::deprecated( __METHOD__, "1.21" );
2302
2303                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2304                 $this->doQuickEditContent( $content, $user, $comment, $minor );
2305         }
2306
2307         /**
2308          * Edit an article without doing all that other stuff
2309          * The article must already exist; link tables etc
2310          * are not updated, caches are not flushed.
2311          *
2312          * @param Content $content Content submitted
2313          * @param User $user The relevant user
2314          * @param string $comment comment submitted
2315          * @param string $serialisation_format Format for storing the content in the database
2316          * @param bool $minor Whereas it's a minor modification
2317          */
2318         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = false,
2319                 $serialisation_format = null
2320         ) {
2321                 wfProfileIn( __METHOD__ );
2322
2323                 $serialized = $content->serialize( $serialisation_format );
2324
2325                 $dbw = wfGetDB( DB_MASTER );
2326                 $revision = new Revision( array(
2327                         'title'      => $this->getTitle(), // for determining the default content model
2328                         'page'       => $this->getId(),
2329                         'user_text'  => $user->getName(),
2330                         'user'       => $user->getId(),
2331                         'text'       => $serialized,
2332                         'length'     => $content->getSize(),
2333                         'comment'    => $comment,
2334                         'minor_edit' => $minor ? 1 : 0,
2335                 ) ); // XXX: set the content object?
2336                 $revision->insertOn( $dbw );
2337                 $this->updateRevisionOn( $dbw, $revision );
2338
2339                 wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2340
2341                 wfProfileOut( __METHOD__ );
2342         }
2343
2344         /**
2345          * Update the article's restriction field, and leave a log entry.
2346          * This works for protection both existing and non-existing pages.
2347          *
2348          * @param array $limit Set of restriction keys
2349          * @param array $expiry Per restriction type expiration
2350          * @param int &$cascade Set to false if cascading protection isn't allowed.
2351          * @param string $reason
2352          * @param User $user The user updating the restrictions
2353          * @return Status
2354          */
2355         public function doUpdateRestrictions( array $limit, array $expiry,
2356                 &$cascade, $reason, User $user
2357         ) {
2358                 global $wgCascadingRestrictionLevels, $wgContLang;
2359
2360                 if ( wfReadOnly() ) {
2361                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2362                 }
2363
2364                 $this->loadPageData( 'fromdbmaster' );
2365                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2366                 $id = $this->getId();
2367
2368                 if ( !$cascade ) {
2369                         $cascade = false;
2370                 }
2371
2372                 // Take this opportunity to purge out expired restrictions
2373                 Title::purgeExpiredRestrictions();
2374
2375                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2376                 // we expect a single selection, but the schema allows otherwise.
2377                 $isProtected = false;
2378                 $protect = false;
2379                 $changed = false;
2380
2381                 $dbw = wfGetDB( DB_MASTER );
2382
2383                 foreach ( $restrictionTypes as $action ) {
2384                         if ( !isset( $expiry[$action] ) ) {
2385                                 $expiry[$action] = $dbw->getInfinity();
2386                         }
2387                         if ( !isset( $limit[$action] ) ) {
2388                                 $limit[$action] = '';
2389                         } elseif ( $limit[$action] != '' ) {
2390                                 $protect = true;
2391                         }
2392
2393                         // Get current restrictions on $action
2394                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2395                         if ( $current != '' ) {
2396                                 $isProtected = true;
2397                         }
2398
2399                         if ( $limit[$action] != $current ) {
2400                                 $changed = true;
2401                         } elseif ( $limit[$action] != '' ) {
2402                                 // Only check expiry change if the action is actually being
2403                                 // protected, since expiry does nothing on an not-protected
2404                                 // action.
2405                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2406                                         $changed = true;
2407                                 }
2408                         }
2409                 }
2410
2411                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2412                         $changed = true;
2413                 }
2414
2415                 // If nothing has changed, do nothing
2416                 if ( !$changed ) {
2417                         return Status::newGood();
2418                 }
2419
2420                 if ( !$protect ) { // No protection at all means unprotection
2421                         $revCommentMsg = 'unprotectedarticle';
2422                         $logAction = 'unprotect';
2423                 } elseif ( $isProtected ) {
2424                         $revCommentMsg = 'modifiedarticleprotection';
2425                         $logAction = 'modify';
2426                 } else {
2427                         $revCommentMsg = 'protectedarticle';
2428                         $logAction = 'protect';
2429                 }
2430
2431                 // Truncate for whole multibyte characters
2432                 $reason = $wgContLang->truncate( $reason, 255 );
2433
2434                 $logRelationsValues = array();
2435                 $logRelationsField = null;
2436
2437                 if ( $id ) { // Protection of existing page
2438                         if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2439                                 return Status::newGood();
2440                         }
2441
2442                         // Only certain restrictions can cascade...
2443                         $editrestriction = isset( $limit['edit'] )
2444                                 ? array( $limit['edit'] )
2445                                 : $this->mTitle->getRestrictions( 'edit' );
2446                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2447                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2448                         }
2449                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2450                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2451                         }
2452
2453                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2454                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2455                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2456                         }
2457                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2458                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2459                         }
2460
2461                         // The schema allows multiple restrictions
2462                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2463                                 $cascade = false;
2464                         }
2465
2466                         // insert null revision to identify the page protection change as edit summary
2467                         $latest = $this->getLatest();
2468                         $nullRevision = $this->insertProtectNullRevision(
2469                                 $revCommentMsg,
2470                                 $limit,
2471                                 $expiry,
2472                                 $cascade,
2473                                 $reason,
2474                                 $user
2475                         );
2476
2477                         if ( $nullRevision === null ) {
2478                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2479                         }
2480
2481                         $logRelationsField = 'pr_id';
2482
2483                         // Update restrictions table
2484                         foreach ( $limit as $action => $restrictions ) {
2485                                 $dbw->delete(
2486                                         'page_restrictions',
2487                                         array(
2488                                                 'pr_page' => $id,
2489                                                 'pr_type' => $action
2490                                         ),
2491                                         __METHOD__
2492                                 );
2493                                 if ( $restrictions != '' ) {
2494                                         $dbw->insert(
2495                                                 'page_restrictions',
2496                                                 array(
2497                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2498                                                         'pr_page' => $id,
2499                                                         'pr_type' => $action,
2500                                                         'pr_level' => $restrictions,
2501                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2502                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2503                                                 ),
2504                                                 __METHOD__
2505                                         );
2506                                         $logRelationsValues[] = $dbw->insertId();
2507                                 }
2508                         }
2509
2510                         // Clear out legacy restriction fields
2511                         $dbw->update(
2512                                 'page',
2513                                 array( 'page_restrictions' => '' ),
2514                                 array( 'page_id' => $id ),
2515                                 __METHOD__
2516                         );
2517
2518                         wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2519                         wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2520                 } else { // Protection of non-existing page (also known as "title protection")
2521                         // Cascade protection is meaningless in this case
2522                         $cascade = false;
2523
2524                         if ( $limit['create'] != '' ) {
2525                                 $dbw->replace( 'protected_titles',
2526                                         array( array( 'pt_namespace', 'pt_title' ) ),
2527                                         array(
2528                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2529                                                 'pt_title' => $this->mTitle->getDBkey(),
2530                                                 'pt_create_perm' => $limit['create'],
2531                                                 'pt_timestamp' => $dbw->timestamp(),
2532                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2533                                                 'pt_user' => $user->getId(),
2534                                                 'pt_reason' => $reason,
2535                                         ), __METHOD__
2536                                 );
2537                         } else {
2538                                 $dbw->delete( 'protected_titles',
2539                                         array(
2540                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2541                                                 'pt_title' => $this->mTitle->getDBkey()
2542                                         ), __METHOD__
2543                                 );
2544                         }
2545                 }
2546
2547                 $this->mTitle->flushRestrictions();
2548                 InfoAction::invalidateCache( $this->mTitle );
2549
2550                 if ( $logAction == 'unprotect' ) {
2551                         $params = array();
2552                 } else {
2553                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2554                         $params = array( $protectDescriptionLog, $cascade ? 'cascade' : '' );
2555                 }
2556
2557                 // Update the protection log
2558                 $log = new LogPage( 'protect' );
2559                 $logId = $log->addEntry( $logAction, $this->mTitle, $reason, $params, $user );
2560                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2561                         $log->addRelations( $logRelationsField, $logRelationsValues, $logId );
2562                 }
2563
2564                 return Status::newGood();
2565         }
2566
2567         /**
2568          * Insert a new null revision for this page.
2569          *
2570          * @param string $revCommentMsg Comment message key for the revision
2571          * @param array $limit Set of restriction keys
2572          * @param array $expiry Per restriction type expiration
2573          * @param int $cascade Set to false if cascading protection isn't allowed.
2574          * @param string $reason
2575          * @param User|null $user
2576          * @return Revision|null Null on error
2577          */
2578         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2579                 array $expiry, $cascade, $reason, $user = null
2580         ) {
2581                 global $wgContLang;
2582                 $dbw = wfGetDB( DB_MASTER );
2583
2584                 // Prepare a null revision to be added to the history
2585                 $editComment = $wgContLang->ucfirst(
2586                         wfMessage(
2587                                 $revCommentMsg,
2588                                 $this->mTitle->getPrefixedText()
2589                         )->inContentLanguage()->text()
2590                 );
2591                 if ( $reason ) {
2592                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2593                 }
2594                 $protectDescription = $this->protectDescription( $limit, $expiry );
2595                 if ( $protectDescription ) {
2596                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2597                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2598                                 ->inContentLanguage()->text();
2599                 }
2600                 if ( $cascade ) {
2601                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2602                         $editComment .= wfMessage( 'brackets' )->params(
2603                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2604                         )->inContentLanguage()->text();
2605                 }
2606
2607                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2608                 if ( $nullRev ) {
2609                         $nullRev->insertOn( $dbw );
2610
2611                         // Update page record and touch page
2612                         $oldLatest = $nullRev->getParentId();
2613                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2614                 }
2615
2616                 return $nullRev;
2617         }
2618
2619         /**
2620          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2621          * @return string
2622          */
2623         protected function formatExpiry( $expiry ) {
2624                 global $wgContLang;
2625                 $dbr = wfGetDB( DB_SLAVE );
2626
2627                 $encodedExpiry = $dbr->encodeExpiry( $expiry );
2628                 if ( $encodedExpiry != 'infinity' ) {
2629                         return wfMessage(
2630                                 'protect-expiring',
2631                                 $wgContLang->timeanddate( $expiry, false, false ),
2632                                 $wgContLang->date( $expiry, false, false ),
2633                                 $wgContLang->time( $expiry, false, false )
2634                         )->inContentLanguage()->text();
2635                 } else {
2636                         return wfMessage( 'protect-expiry-indefinite' )
2637                                 ->inContentLanguage()->text();
2638                 }
2639         }
2640
2641         /**
2642          * Builds the description to serve as comment for the edit.
2643          *
2644          * @param array $limit Set of restriction keys
2645          * @param array $expiry Per restriction type expiration
2646          * @return string
2647          */
2648         public function protectDescription( array $limit, array $expiry ) {
2649                 $protectDescription = '';
2650
2651                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2652                         # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
2653                         # All possible message keys are listed here for easier grepping:
2654                         # * restriction-create
2655                         # * restriction-edit
2656                         # * restriction-move
2657                         # * restriction-upload
2658                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2659                         # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
2660                         # with '' filtered out. All possible message keys are listed below:
2661                         # * protect-level-autoconfirmed
2662                         # * protect-level-sysop
2663                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )->inContentLanguage()->text();
2664
2665                         $expiryText = $this->formatExpiry( $expiry[$action] );
2666
2667                         if ( $protectDescription !== '' ) {
2668                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2669                         }
2670                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2671                                 ->params( $actionText, $restrictionsText, $expiryText )
2672                                 ->inContentLanguage()->text();
2673                 }
2674
2675                 return $protectDescription;
2676         }
2677
2678         /**
2679          * Builds the description to serve as comment for the log entry.
2680          *
2681          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2682          * protect description text. Keep them in old format to avoid breaking compatibility.
2683          * TODO: Fix protection log to store structured description and format it on-the-fly.
2684          *
2685          * @param array $limit Set of restriction keys
2686          * @param array $expiry Per restriction type expiration
2687          * @return string
2688          */
2689         public function protectDescriptionLog( array $limit, array $expiry ) {
2690                 global $wgContLang;
2691
2692                 $protectDescriptionLog = '';
2693
2694                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2695                         $expiryText = $this->formatExpiry( $expiry[$action] );
2696                         $protectDescriptionLog .= $wgContLang->getDirMark() . "[$action=$restrictions] ($expiryText)";
2697                 }
2698
2699                 return trim( $protectDescriptionLog );
2700         }
2701
2702         /**
2703          * Take an array of page restrictions and flatten it to a string
2704          * suitable for insertion into the page_restrictions field.
2705          *
2706          * @param string[] $limit
2707          *
2708          * @throws MWException
2709          * @return string
2710          */
2711         protected static function flattenRestrictions( $limit ) {
2712                 if ( !is_array( $limit ) ) {
2713                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2714                 }
2715
2716                 $bits = array();
2717                 ksort( $limit );
2718
2719                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2720                         $bits[] = "$action=$restrictions";
2721                 }
2722
2723                 return implode( ':', $bits );
2724         }
2725
2726         /**
2727          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2728          * backwards compatibility, if you care about error reporting you should use
2729          * doDeleteArticleReal() instead.
2730          *
2731          * Deletes the article with database consistency, writes logs, purges caches
2732          *
2733          * @param string $reason Delete reason for deletion log
2734          * @param bool $suppress Suppress all revisions and log the deletion in
2735          *        the suppression log instead of the deletion log
2736          * @param int $id Article ID
2737          * @param bool $commit Defaults to true, triggers transaction end
2738          * @param array &$error Array of errors to append to
2739          * @param User $user The deleting user
2740          * @return bool true if successful
2741          */
2742         public function doDeleteArticle(
2743                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2744         ) {
2745                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2746                 return $status->isGood();
2747         }
2748
2749         /**
2750          * Back-end article deletion
2751          * Deletes the article with database consistency, writes logs, purges caches
2752          *
2753          * @since 1.19
2754          *
2755          * @param string $reason Delete reason for deletion log
2756          * @param bool $suppress Suppress all revisions and log the deletion in
2757          *   the suppression log instead of the deletion log
2758          * @param int $id Article ID
2759          * @param bool $commit Defaults to true, triggers transaction end
2760          * @param array &$error Array of errors to append to
2761          * @param User $user The deleting user
2762          * @return Status Status object; if successful, $status->value is the log_id of the
2763          *   deletion log entry. If the page couldn't be deleted because it wasn't
2764          *   found, $status is a non-fatal 'cannotdelete' error
2765          */
2766         public function doDeleteArticleReal(
2767                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2768         ) {
2769                 global $wgUser, $wgContentHandlerUseDB;
2770
2771                 wfDebug( __METHOD__ . "\n" );
2772
2773                 $status = Status::newGood();
2774
2775                 if ( $this->mTitle->getDBkey() === '' ) {
2776                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2777                         return $status;
2778                 }
2779
2780                 $user = is_null( $user ) ? $wgUser : $user;
2781                 if ( ! wfRunHooks( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2782                         if ( $status->isOK() ) {
2783                                 // Hook aborted but didn't set a fatal status
2784                                 $status->fatal( 'delete-hook-aborted' );
2785                         }
2786                         return $status;
2787                 }
2788
2789                 $dbw = wfGetDB( DB_MASTER );
2790                 $dbw->begin( __METHOD__ );
2791
2792                 if ( $id == 0 ) {
2793                         $this->loadPageData( 'forupdate' );
2794                         $id = $this->getID();
2795                         if ( $id == 0 ) {
2796                                 $dbw->rollback( __METHOD__ );
2797                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2798                                 return $status;
2799                         }
2800                 }
2801
2802                 // we need to remember the old content so we can use it to generate all deletion updates.
2803                 $content = $this->getContent( Revision::RAW );
2804
2805                 // Bitfields to further suppress the content
2806                 if ( $suppress ) {
2807                         $bitfield = 0;
2808                         // This should be 15...
2809                         $bitfield |= Revision::DELETED_TEXT;
2810                         $bitfield |= Revision::DELETED_COMMENT;
2811                         $bitfield |= Revision::DELETED_USER;
2812                         $bitfield |= Revision::DELETED_RESTRICTED;
2813                 } else {
2814                         $bitfield = 'rev_deleted';
2815                 }
2816
2817                 // For now, shunt the revision data into the archive table.
2818                 // Text is *not* removed from the text table; bulk storage
2819                 // is left intact to avoid breaking block-compression or
2820                 // immutable storage schemes.
2821                 //
2822                 // For backwards compatibility, note that some older archive
2823                 // table entries will have ar_text and ar_flags fields still.
2824                 //
2825                 // In the future, we may keep revisions and mark them with
2826                 // the rev_deleted field, which is reserved for this purpose.
2827
2828                 $row = array(
2829                         'ar_namespace'  => 'page_namespace',
2830                         'ar_title'      => 'page_title',
2831                         'ar_comment'    => 'rev_comment',
2832                         'ar_user'       => 'rev_user',
2833                         'ar_user_text'  => 'rev_user_text',
2834                         'ar_timestamp'  => 'rev_timestamp',
2835                         'ar_minor_edit' => 'rev_minor_edit',
2836                         'ar_rev_id'     => 'rev_id',
2837                         'ar_parent_id'  => 'rev_parent_id',
2838                         'ar_text_id'    => 'rev_text_id',
2839                         'ar_text'       => '\'\'', // Be explicit to appease
2840                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2841                         'ar_len'        => 'rev_len',
2842                         'ar_page_id'    => 'page_id',
2843                         'ar_deleted'    => $bitfield,
2844                         'ar_sha1'       => 'rev_sha1',
2845                 );
2846
2847                 if ( $wgContentHandlerUseDB ) {
2848                         $row['ar_content_model'] = 'rev_content_model';
2849                         $row['ar_content_format'] = 'rev_content_format';
2850                 }
2851
2852                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2853                         $row,
2854                         array(
2855                                 'page_id' => $id,
2856                                 'page_id = rev_page'
2857                         ), __METHOD__
2858                 );
2859
2860                 // Now that it's safely backed up, delete it
2861                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2862                 $ok = ( $dbw->affectedRows() > 0 ); // $id could be laggy
2863
2864                 if ( !$ok ) {
2865                         $dbw->rollback( __METHOD__ );
2866                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2867                         return $status;
2868                 }
2869
2870                 if ( !$dbw->cascadingDeletes() ) {
2871                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2872                 }
2873
2874                 // Clone the title, so we have the information we need when we log
2875                 $logTitle = clone $this->mTitle;
2876
2877                 $this->doDeleteUpdates( $id, $content );
2878
2879                 // Log the deletion, if the page was suppressed, log it at Oversight instead
2880                 $logtype = $suppress ? 'suppress' : 'delete';
2881
2882                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2883                 $logEntry->setPerformer( $user );
2884                 $logEntry->setTarget( $logTitle );
2885                 $logEntry->setComment( $reason );
2886                 $logid = $logEntry->insert();
2887
2888                 $dbw->onTransactionPreCommitOrIdle( function() use ( $dbw, $logEntry, $logid ) {
2889                         // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
2890                         $logEntry->publish( $logid );
2891                 } );
2892
2893                 if ( $commit ) {
2894                         $dbw->commit( __METHOD__ );
2895                 }
2896
2897                 wfRunHooks( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id, $content, $logEntry ) );
2898                 $status->value = $logid;
2899                 return $status;
2900         }
2901
2902         /**
2903          * Do some database updates after deletion
2904          *
2905          * @param int $id page_id value of the page being deleted
2906          * @param Content $content Optional page content to be used when determining
2907          *   the required updates. This may be needed because $this->getContent()
2908          *   may already return null when the page proper was deleted.
2909          */
2910         public function doDeleteUpdates( $id, Content $content = null ) {
2911                 // update site status
2912                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2913
2914                 // remove secondary indexes, etc
2915                 $updates = $this->getDeletionUpdates( $content );
2916                 DataUpdate::runUpdates( $updates );
2917
2918                 // Reparse any pages transcluding this page
2919                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
2920
2921                 // Reparse any pages including this image
2922                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
2923                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
2924                 }
2925
2926                 // Clear caches
2927                 WikiPage::onArticleDelete( $this->mTitle );
2928
2929                 // Reset this object and the Title object
2930                 $this->loadFromRow( false, self::READ_LATEST );
2931
2932                 // Search engine
2933                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
2934         }
2935
2936         /**
2937          * Roll back the most recent consecutive set of edits to a page
2938          * from the same user; fails if there are no eligible edits to
2939          * roll back to, e.g. user is the sole contributor. This function
2940          * performs permissions checks on $user, then calls commitRollback()
2941          * to do the dirty work
2942          *
2943          * @todo Separate the business/permission stuff out from backend code
2944          *
2945          * @param string $fromP Name of the user whose edits to rollback.
2946          * @param string $summary Custom summary. Set to default summary if empty.
2947          * @param string $token Rollback token.
2948          * @param bool $bot If true, mark all reverted edits as bot.
2949          *
2950          * @param array $resultDetails contains result-specific array of additional values
2951          *    'alreadyrolled' : 'current' (rev)
2952          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2953          *
2954          * @param User $user The user performing the rollback
2955          * @return array Array of errors, each error formatted as
2956          *   array(messagekey, param1, param2, ...).
2957          * On success, the array is empty.  This array can also be passed to
2958          * OutputPage::showPermissionsErrorPage().
2959          */
2960         public function doRollback(
2961                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2962         ) {
2963                 $resultDetails = null;
2964
2965                 // Check permissions
2966                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2967                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2968                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2969
2970                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2971                         $errors[] = array( 'sessionfailure' );
2972                 }
2973
2974                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2975                         $errors[] = array( 'actionthrottledtext' );
2976                 }
2977
2978                 // If there were errors, bail out now
2979                 if ( !empty( $errors ) ) {
2980                         return $errors;
2981                 }
2982
2983                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2984         }
2985
2986         /**
2987          * Backend implementation of doRollback(), please refer there for parameter
2988          * and return value documentation
2989          *
2990          * NOTE: This function does NOT check ANY permissions, it just commits the
2991          * rollback to the DB. Therefore, you should only call this function direct-
2992          * ly if you want to use custom permissions checks. If you don't, use
2993          * doRollback() instead.
2994          * @param string $fromP Name of the user whose edits to rollback.
2995          * @param string $summary Custom summary. Set to default summary if empty.
2996          * @param bool $bot If true, mark all reverted edits as bot.
2997          *
2998          * @param array $resultDetails Contains result-specific array of additional values
2999          * @param User $guser The user performing the rollback
3000          * @return array
3001          */
3002         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
3003                 global $wgUseRCPatrol, $wgContLang;
3004
3005                 $dbw = wfGetDB( DB_MASTER );
3006
3007                 if ( wfReadOnly() ) {
3008                         return array( array( 'readonlytext' ) );
3009                 }
3010
3011                 // Get the last editor
3012                 $current = $this->getRevision();
3013                 if ( is_null( $current ) ) {
3014                         // Something wrong... no page?
3015                         return array( array( 'notanarticle' ) );
3016                 }
3017
3018                 $from = str_replace( '_', ' ', $fromP );
3019                 // User name given should match up with the top revision.
3020                 // If the user was deleted then $from should be empty.
3021                 if ( $from != $current->getUserText() ) {
3022                         $resultDetails = array( 'current' => $current );
3023                         return array( array( 'alreadyrolled',
3024                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3025                                 htmlspecialchars( $fromP ),
3026                                 htmlspecialchars( $current->getUserText() )
3027                         ) );
3028                 }
3029
3030                 // Get the last edit not by this guy...
3031                 // Note: these may not be public values
3032                 $user = intval( $current->getRawUser() );
3033                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3034                 $s = $dbw->selectRow( 'revision',
3035                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3036                         array( 'rev_page' => $current->getPage(),
3037                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3038                         ), __METHOD__,
3039                         array( 'USE INDEX' => 'page_timestamp',
3040                                 'ORDER BY' => 'rev_timestamp DESC' )
3041                         );
3042                 if ( $s === false ) {
3043                         // No one else ever edited this page
3044                         return array( array( 'cantrollback' ) );
3045                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3046                         || $s->rev_deleted & Revision::DELETED_USER
3047                 ) {
3048                         // Only admins can see this text
3049                         return array( array( 'notvisiblerev' ) );
3050                 }
3051
3052                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3053                 // This is done before the rollback edit to have patrolling also on failure (bug 62157).
3054                 $set = array();
3055                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3056                         // Mark all reverted edits as bot
3057                         $set['rc_bot'] = 1;
3058                 }
3059
3060                 if ( $wgUseRCPatrol ) {
3061                         // Mark all reverted edits as patrolled
3062                         $set['rc_patrolled'] = 1;
3063                 }
3064
3065                 if ( count( $set ) ) {
3066                         $dbw->update( 'recentchanges', $set,
3067                                 array( /* WHERE */
3068                                         'rc_cur_id' => $current->getPage(),
3069                                         'rc_user_text' => $current->getUserText(),
3070                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3071                                 ), __METHOD__
3072                         );
3073                 }
3074
3075                 // Generate the edit summary if necessary
3076                 $target = Revision::newFromId( $s->rev_id );
3077                 if ( empty( $summary ) ) {
3078                         if ( $from == '' ) { // no public user name
3079                                 $summary = wfMessage( 'revertpage-nouser' );
3080                         } else {
3081                                 $summary = wfMessage( 'revertpage' );
3082                         }
3083                 }
3084
3085                 // Allow the custom summary to use the same args as the default message
3086                 $args = array(
3087                         $target->getUserText(), $from, $s->rev_id,
3088                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3089                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3090                 );
3091                 if ( $summary instanceof Message ) {
3092                         $summary = $summary->params( $args )->inContentLanguage()->text();
3093                 } else {
3094                         $summary = wfMsgReplaceArgs( $summary, $args );
3095                 }
3096
3097                 // Trim spaces on user supplied text
3098                 $summary = trim( $summary );
3099
3100                 // Truncate for whole multibyte characters.
3101                 $summary = $wgContLang->truncate( $summary, 255 );
3102
3103                 // Save
3104                 $flags = EDIT_UPDATE;
3105
3106                 if ( $guser->isAllowed( 'minoredit' ) ) {
3107                         $flags |= EDIT_MINOR;
3108                 }
3109
3110                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3111                         $flags |= EDIT_FORCE_BOT;
3112                 }
3113
3114                 // Actually store the edit
3115                 $status = $this->doEditContent(
3116                         $target->getContent(),
3117                         $summary,
3118                         $flags,
3119                         $target->getId(),
3120                         $guser
3121                 );
3122
3123                 if ( !$status->isOK() ) {
3124                         return $status->getErrorsArray();
3125                 }
3126
3127                 // raise error, when the edit is an edit without a new version
3128                 if ( empty( $status->value['revision'] ) ) {
3129                         $resultDetails = array( 'current' => $current );
3130                         return array( array( 'alreadyrolled',
3131                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3132                                         htmlspecialchars( $fromP ),
3133                                         htmlspecialchars( $current->getUserText() )
3134                         ) );
3135                 }
3136
3137                 $revId = $status->value['revision']->getId();
3138
3139                 wfRunHooks( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
3140
3141                 $resultDetails = array(
3142                         'summary' => $summary,
3143                         'current' => $current,
3144                         'target' => $target,
3145                         'newid' => $revId
3146                 );
3147
3148                 return array();
3149         }
3150
3151         /**
3152          * The onArticle*() functions are supposed to be a kind of hooks
3153          * which should be called whenever any of the specified actions
3154          * are done.
3155          *
3156          * This is a good place to put code to clear caches, for instance.
3157          *
3158          * This is called on page move and undelete, as well as edit
3159          *
3160          * @param Title $title
3161          */
3162         public static function onArticleCreate( $title ) {
3163                 // Update existence markers on article/talk tabs...
3164                 if ( $title->isTalkPage() ) {
3165                         $other = $title->getSubjectPage();
3166                 } else {
3167                         $other = $title->getTalkPage();
3168                 }
3169
3170                 $other->invalidateCache();
3171                 $other->purgeSquid();
3172
3173                 $title->touchLinks();
3174                 $title->purgeSquid();
3175                 $title->deleteTitleProtection();
3176         }
3177
3178         /**
3179          * Clears caches when article is deleted
3180          *
3181          * @param Title $title
3182          */
3183         public static function onArticleDelete( $title ) {
3184                 // Update existence markers on article/talk tabs...
3185                 if ( $title->isTalkPage() ) {
3186                         $other = $title->getSubjectPage();
3187                 } else {
3188                         $other = $title->getTalkPage();
3189                 }
3190
3191                 $other->invalidateCache();
3192                 $other->purgeSquid();
3193
3194                 $title->touchLinks();
3195                 $title->purgeSquid();
3196
3197                 // File cache
3198                 HTMLFileCache::clearFileCache( $title );
3199                 InfoAction::invalidateCache( $title );
3200
3201                 // Messages
3202                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3203                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3204                 }
3205
3206                 // Images
3207                 if ( $title->getNamespace() == NS_FILE ) {
3208                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3209                         $update->doUpdate();
3210                 }
3211
3212                 // User talk pages
3213                 if ( $title->getNamespace() == NS_USER_TALK ) {
3214                         $user = User::newFromName( $title->getText(), false );
3215                         if ( $user ) {
3216                                 $user->setNewtalk( false );
3217                         }
3218                 }
3219
3220                 // Image redirects
3221                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3222         }
3223
3224         /**
3225          * Purge caches on page update etc
3226          *
3227          * @param Title $title
3228          * @todo Verify that $title is always a Title object (and never false or
3229          *   null), add Title hint to parameter $title.
3230          */
3231         public static function onArticleEdit( $title ) {
3232                 // Invalidate caches of articles which include this page
3233                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
3234
3235                 // Invalidate the caches of all pages which redirect here
3236                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
3237
3238                 // Purge squid for this page only
3239                 $title->purgeSquid();
3240
3241                 // Clear file cache for this page only
3242                 HTMLFileCache::clearFileCache( $title );
3243                 InfoAction::invalidateCache( $title );
3244         }
3245
3246         /**#@-*/
3247
3248         /**
3249          * Returns a list of categories this page is a member of.
3250          * Results will include hidden categories
3251          *
3252          * @return TitleArray
3253          */
3254         public function getCategories() {
3255                 $id = $this->getId();
3256                 if ( $id == 0 ) {
3257                         return TitleArray::newFromResult( new FakeResultWrapper( array() ) );
3258                 }
3259
3260                 $dbr = wfGetDB( DB_SLAVE );
3261                 $res = $dbr->select( 'categorylinks',
3262                         array( 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ),
3263                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3264                         // as not being aliases, and NS_CATEGORY is numeric
3265                         array( 'cl_from' => $id ),
3266                         __METHOD__ );
3267
3268                 return TitleArray::newFromResult( $res );
3269         }
3270
3271         /**
3272          * Returns a list of hidden categories this page is a member of.
3273          * Uses the page_props and categorylinks tables.
3274          *
3275          * @return array Array of Title objects
3276          */
3277         public function getHiddenCategories() {
3278                 $result = array();
3279                 $id = $this->getId();
3280
3281                 if ( $id == 0 ) {
3282                         return array();
3283                 }
3284
3285                 $dbr = wfGetDB( DB_SLAVE );
3286                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3287                         array( 'cl_to' ),
3288                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3289                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
3290                         __METHOD__ );
3291
3292                 if ( $res !== false ) {
3293                         foreach ( $res as $row ) {
3294                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3295                         }
3296                 }
3297
3298                 return $result;
3299         }
3300
3301         /**
3302          * Return an applicable autosummary if one exists for the given edit.
3303          * @param string|null $oldtext The previous text of the page.
3304          * @param string|null $newtext The submitted text of the page.
3305          * @param int $flags Bitmask: a bitmask of flags submitted for the edit.
3306          * @return string An appropriate autosummary, or an empty string.
3307          *
3308          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3309          */
3310         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3311                 // NOTE: stub for backwards-compatibility. assumes the given text is
3312                 // wikitext. will break horribly if it isn't.
3313
3314                 ContentHandler::deprecated( __METHOD__, '1.21' );
3315
3316                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3317                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3318                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3319
3320                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3321         }
3322
3323         /**
3324          * Auto-generates a deletion reason
3325          *
3326          * @param bool &$hasHistory Whether the page has a history
3327          * @return string|bool String containing deletion reason or empty string, or boolean false
3328          *    if no revision occurred
3329          */
3330         public function getAutoDeleteReason( &$hasHistory ) {
3331                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3332         }
3333
3334         /**
3335          * Update all the appropriate counts in the category table, given that
3336          * we've added the categories $added and deleted the categories $deleted.
3337          *
3338          * @param array $added The names of categories that were added
3339          * @param array $deleted The names of categories that were deleted
3340          */
3341         public function updateCategoryCounts( array $added, array $deleted ) {
3342                 $that = $this;
3343                 $method = __METHOD__;
3344                 $dbw = wfGetDB( DB_MASTER );
3345
3346                 // Do this at the end of the commit to reduce lock wait timeouts
3347                 $dbw->onTransactionPreCommitOrIdle(
3348                         function() use ( $dbw, $that, $method, $added, $deleted ) {
3349                                 $ns = $that->getTitle()->getNamespace();
3350
3351                                 $addFields = array( 'cat_pages = cat_pages + 1' );
3352                                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3353                                 if ( $ns == NS_CATEGORY ) {
3354                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3355                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3356                                 } elseif ( $ns == NS_FILE ) {
3357                                         $addFields[] = 'cat_files = cat_files + 1';
3358                                         $removeFields[] = 'cat_files = cat_files - 1';
3359                                 }
3360
3361                                 if ( count( $added ) ) {
3362                                         $insertRows = array();
3363                                         foreach ( $added as $cat ) {
3364                                                 $insertRows[] = array(
3365                                                         'cat_title'   => $cat,
3366                                                         'cat_pages'   => 1,
3367                                                         'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3368                                                         'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3369                                                 );
3370                                         }
3371                                         $dbw->upsert(
3372                                                 'category',
3373                                                 $insertRows,
3374                                                 array( 'cat_title' ),
3375                                                 $addFields,
3376                                                 $method
3377                                         );
3378                                 }
3379
3380                                 if ( count( $deleted ) ) {
3381                                         $dbw->update(
3382                                                 'category',
3383                                                 $removeFields,
3384                                                 array( 'cat_title' => $deleted ),
3385                                                 $method
3386                                         );
3387                                 }
3388
3389                                 foreach ( $added as $catName ) {
3390                                         $cat = Category::newFromName( $catName );
3391                                         wfRunHooks( 'CategoryAfterPageAdded', array( $cat, $that ) );
3392                                 }
3393
3394                                 foreach ( $deleted as $catName ) {
3395                                         $cat = Category::newFromName( $catName );
3396                                         wfRunHooks( 'CategoryAfterPageRemoved', array( $cat, $that ) );
3397                                 }
3398                         }
3399                 );
3400         }
3401
3402         /**
3403          * Updates cascading protections
3404          *
3405          * @param ParserOutput $parserOutput ParserOutput object for the current version
3406          */
3407         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
3408                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
3409                         return;
3410                 }
3411
3412                 // templatelinks or imagelinks tables may have become out of sync,
3413                 // especially if using variable-based transclusions.
3414                 // For paranoia, check if things have changed and if
3415                 // so apply updates to the database. This will ensure
3416                 // that cascaded protections apply as soon as the changes
3417                 // are visible.
3418
3419                 // Get templates from templatelinks and images from imagelinks
3420                 $id = $this->getId();
3421
3422                 $dbLinks = array();
3423
3424                 $dbr = wfGetDB( DB_SLAVE );
3425                 $res = $dbr->select( array( 'templatelinks' ),
3426                         array( 'tl_namespace', 'tl_title' ),
3427                         array( 'tl_from' => $id ),
3428                         __METHOD__
3429                 );
3430
3431                 foreach ( $res as $row ) {
3432                         $dbLinks["{$row->tl_namespace}:{$row->tl_title}"] = true;
3433                 }
3434
3435                 $dbr = wfGetDB( DB_SLAVE );
3436                 $res = $dbr->select( array( 'imagelinks' ),
3437                         array( 'il_to' ),
3438                         array( 'il_from' => $id ),
3439                         __METHOD__
3440                 );
3441
3442                 foreach ( $res as $row ) {
3443                         $dbLinks[NS_FILE . ":{$row->il_to}"] = true;
3444                 }
3445
3446                 // Get templates and images from parser output.
3447                 $poLinks = array();
3448                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3449                         foreach ( $templates as $dbk => $id ) {
3450                                 $poLinks["$ns:$dbk"] = true;
3451                         }
3452                 }
3453                 foreach ( $parserOutput->getImages() as $dbk => $id ) {
3454                         $poLinks[NS_FILE . ":$dbk"] = true;
3455                 }
3456
3457                 // Get the diff
3458                 $links_diff = array_diff_key( $poLinks, $dbLinks );
3459
3460                 if ( count( $links_diff ) > 0 ) {
3461                         // Whee, link updates time.
3462                         // Note: we are only interested in links here. We don't need to get
3463                         // other DataUpdate items from the parser output.
3464                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3465                         $u->doUpdate();
3466                 }
3467         }
3468
3469         /**
3470          * Return a list of templates used by this article.
3471          * Uses the templatelinks table
3472          *
3473          * @deprecated since 1.19; use Title::getTemplateLinksFrom()
3474          * @return array Array of Title objects
3475          */
3476         public function getUsedTemplates() {
3477                 return $this->mTitle->getTemplateLinksFrom();
3478         }
3479
3480         /**
3481          * This function is called right before saving the wikitext,
3482          * so we can do things like signatures and links-in-context.
3483          *
3484          * @deprecated since 1.19; use Parser::preSaveTransform() instead
3485          * @param string $text Article contents
3486          * @param User $user User doing the edit
3487          * @param ParserOptions $popts Parser options, default options for
3488          *   the user loaded if null given
3489          * @return string Article contents with altered wikitext markup (signatures
3490          *      converted, {{subst:}}, templates, etc.)
3491          */
3492         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3493                 global $wgParser, $wgUser;
3494
3495                 wfDeprecated( __METHOD__, '1.19' );
3496
3497                 $user = is_null( $user ) ? $wgUser : $user;
3498
3499                 if ( $popts === null ) {
3500                         $popts = ParserOptions::newFromUser( $user );
3501                 }
3502
3503                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3504         }
3505
3506         /**
3507          * Get the  approximate revision count of this page.
3508          *
3509          * @deprecated since 1.19; use Title::estimateRevisionCount() instead.
3510          * @return int
3511          */
3512         public function estimateRevisionCount() {
3513                 wfDeprecated( __METHOD__, '1.19' );
3514                 return $this->mTitle->estimateRevisionCount();
3515         }
3516
3517         /**
3518          * Update the article's restriction field, and leave a log entry.
3519          *
3520          * @deprecated since 1.19
3521          * @param array $limit Set of restriction keys
3522          * @param string $reason
3523          * @param int &$cascade Set to false if cascading protection isn't allowed.
3524          * @param array $expiry Per restriction type expiration
3525          * @param User $user The user updating the restrictions
3526          * @return bool true on success
3527          */
3528         public function updateRestrictions(
3529                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3530         ) {
3531                 global $wgUser;
3532
3533                 $user = is_null( $user ) ? $wgUser : $user;
3534
3535                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3536         }
3537
3538         /**
3539          * Returns a list of updates to be performed when this page is deleted. The
3540          * updates should remove any information about this page from secondary data
3541          * stores such as links tables.
3542          *
3543          * @param Content|null $content Optional Content object for determining the
3544          *   necessary updates.
3545          * @return array An array of DataUpdates objects
3546          */
3547         public function getDeletionUpdates( Content $content = null ) {
3548                 if ( !$content ) {
3549                         // load content object, which may be used to determine the necessary updates
3550                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3551                         $content = $this->getContent( Revision::RAW );
3552                 }
3553
3554                 if ( !$content ) {
3555                         $updates = array();
3556                 } else {
3557                         $updates = $content->getDeletionUpdates( $this );
3558                 }
3559
3560                 wfRunHooks( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3561                 return $updates;
3562         }
3563 }