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          * Constructor and clear the article
  93          * @param Title $title Reference to a Title object.
  94          */
  95         public function __construct( Title $title ) {
  96                 $this->mTitle = $title;
  97         }
  98
  99         /**
 100          * Create a WikiPage object of the appropriate class for the given title.
 101          *
 102          * @param Title $title
 103          *
 104          * @throws MWException
 105          * @return WikiPage Object of the appropriate type
 106          */
 107         public static function factory( Title $title ) {
 108                 $ns = $title->getNamespace();
 109
 110                 if ( $ns == NS_MEDIA ) {
 111                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 112                 } elseif ( $ns < 0 ) {
 113                         throw new MWException( "Invalid or virtual namespace $ns given." );
 114                 }
 115
 116                 switch ( $ns ) {
 117                         case NS_FILE:
 118                                 $page = new WikiFilePage( $title );
 119                                 break;
 120                         case NS_CATEGORY:
 121                                 $page = new WikiCategoryPage( $title );
 122                                 break;
 123                         default:
 124                                 $page = new WikiPage( $title );
 125                 }
 126
 127                 return $page;
 128         }
 129
 130         /**
 131          * Constructor from a page id
 132          *
 133          * @param int $id Article ID to load
 134          * @param string|int $from One of the following values:
 135          *        - "fromdb" or WikiPage::READ_NORMAL to select from a slave database
 136          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 137          *
 138          * @return WikiPage|null
 139          */
 140         public static function newFromID( $id, $from = 'fromdb' ) {
 141                 // page id's are never 0 or negative, see bug 61166
 142                 if ( $id < 1 ) {
 143                         return null;
 144                 }
 145
 146                 $from = self::convertSelectType( $from );
 147                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_SLAVE );
 148                 $row = $db->selectRow( 'page', self::selectFields(), array( 'page_id' => $id ), __METHOD__ );
 149                 if ( !$row ) {
 150                         return null;
 151                 }
 152                 return self::newFromRow( $row, $from );
 153         }
 154
 155         /**
 156          * Constructor from a database row
 157          *
 158          * @since 1.20
 159          * @param object $row Database row containing at least fields returned by selectFields().
 160          * @param string|int $from Source of $data:
 161          *        - "fromdb" or WikiPage::READ_NORMAL: from a slave DB
 162          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 163          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 164          * @return WikiPage
 165          */
 166         public static function newFromRow( $row, $from = 'fromdb' ) {
 167                 $page = self::factory( Title::newFromRow( $row ) );
 168                 $page->loadFromRow( $row, $from );
 169                 return $page;
 170         }
 171
 172         /**
 173          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 174          *
 175          * @param object|string|int $type
 176          * @return mixed
 177          */
 178         private static function convertSelectType( $type ) {
 179                 switch ( $type ) {
 180                 case 'fromdb':
 181                         return self::READ_NORMAL;
 182                 case 'fromdbmaster':
 183                         return self::READ_LATEST;
 184                 case 'forupdate':
 185                         return self::READ_LOCKING;
 186                 default:
 187                         // It may already be an integer or whatever else
 188                         return $type;
 189                 }
 190         }
 191
 192         /**
 193          * Returns overrides for action handlers.
 194          * Classes listed here will be used instead of the default one when
 195          * (and only when) $wgActions[$action] === true. This allows subclasses
 196          * to override the default behavior.
 197          *
 198          * @todo Move this UI stuff somewhere else
 199          *
 200          * @return array
 201          */
 202         public function getActionOverrides() {
 203                 $content_handler = $this->getContentHandler();
 204                 return $content_handler->getActionOverrides();
 205         }
 206
 207         /**
 208          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 209          *
 210          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 211          *
 212          * @return ContentHandler
 213          *
 214          * @since 1.21
 215          */
 216         public function getContentHandler() {
 217                 return ContentHandler::getForModelID( $this->getContentModel() );
 218         }
 219
 220         /**
 221          * Get the title object of the article
 222          * @return Title Title object of this page
 223          */
 224         public function getTitle() {
 225                 return $this->mTitle;
 226         }
 227
 228         /**
 229          * Clear the object
 230          * @return void
 231          */
 232         public function clear() {
 233                 $this->mDataLoaded = false;
 234                 $this->mDataLoadedFrom = self::READ_NONE;
 235
 236                 $this->clearCacheFields();
 237         }
 238
 239         /**
 240          * Clear the object cache fields
 241          * @return void
 242          */
 243         protected function clearCacheFields() {
 244                 $this->mId = null;
 245                 $this->mRedirectTarget = null; // Title object if set
 246                 $this->mLastRevision = null; // Latest revision
 247                 $this->mTouched = '19700101000000';
 248                 $this->mLinksUpdated = '19700101000000';
 249                 $this->mTimestamp = '';
 250                 $this->mIsRedirect = false;
 251                 $this->mLatest = false;
 252                 // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 253                 // the requested rev ID and content against the cached one for equality. For most
 254                 // content types, the output should not change during the lifetime of this cache.
 255                 // Clearing it can cause extra parses on edit for no reason.
 256         }
 257
 258         /**
 259          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 260          * @return void
 261          * @since 1.23
 262          */
 263         public function clearPreparedEdit() {
 264                 $this->mPreparedEdit = false;
 265         }
 266
 267         /**
 268          * Return the list of revision fields that should be selected to create
 269          * a new page.
 270          *
 271          * @return array
 272          */
 273         public static function selectFields() {
 274                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 275
 276                 $fields = array(
 277                         'page_id',
 278                         'page_namespace',
 279                         'page_title',
 280                         'page_restrictions',
 281                         'page_is_redirect',
 282                         'page_is_new',
 283                         'page_random',
 284                         'page_touched',
 285                         'page_links_updated',
 286                         'page_latest',
 287                         'page_len',
 288                 );
 289
 290                 if ( $wgContentHandlerUseDB ) {
 291                         $fields[] = 'page_content_model';
 292                 }
 293
 294                 if ( $wgPageLanguageUseDB ) {
 295                         $fields[] = 'page_lang';
 296                 }
 297
 298                 return $fields;
 299         }
 300
 301         /**
 302          * Fetch a page record with the given conditions
 303          * @param DatabaseBase $dbr
 304          * @param array $conditions
 305          * @param array $options
 306          * @return object|bool Database result resource, or false on failure
 307          */
 308         protected function pageData( $dbr, $conditions, $options = array() ) {
 309                 $fields = self::selectFields();
 310
 311                 Hooks::run( 'ArticlePageDataBefore', array( &$this, &$fields ) );
 312
 313                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 314
 315                 Hooks::run( 'ArticlePageDataAfter', array( &$this, &$row ) );
 316
 317                 return $row;
 318         }
 319
 320         /**
 321          * Fetch a page record matching the Title object's namespace and title
 322          * using a sanitized title string
 323          *
 324          * @param DatabaseBase $dbr
 325          * @param Title $title
 326          * @param array $options
 327          * @return object|bool Database result resource, or false on failure
 328          */
 329         public function pageDataFromTitle( $dbr, $title, $options = array() ) {
 330                 return $this->pageData( $dbr, array(
 331                         'page_namespace' => $title->getNamespace(),
 332                         'page_title' => $title->getDBkey() ), $options );
 333         }
 334
 335         /**
 336          * Fetch a page record matching the requested ID
 337          *
 338          * @param DatabaseBase $dbr
 339          * @param int $id
 340          * @param array $options
 341          * @return object|bool Database result resource, or false on failure
 342          */
 343         public function pageDataFromId( $dbr, $id, $options = array() ) {
 344                 return $this->pageData( $dbr, array( 'page_id' => $id ), $options );
 345         }
 346
 347         /**
 348          * Load the object from a given source by title
 349          *
 350          * @param object|string|int $from One of the following:
 351          *   - A DB query result object.
 352          *   - "fromdb" or WikiPage::READ_NORMAL to get from a slave DB.
 353          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 354          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 355          *     using SELECT FOR UPDATE.
 356          *
 357          * @return void
 358          */
 359         public function loadPageData( $from = 'fromdb' ) {
 360                 $from = self::convertSelectType( $from );
 361                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 362                         // We already have the data from the correct location, no need to load it twice.
 363                         return;
 364                 }
 365
 366                 if ( $from === self::READ_LOCKING ) {
 367                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle, array( 'FOR UPDATE' ) );
 368                 } elseif ( $from === self::READ_LATEST ) {
 369                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 370                 } elseif ( $from === self::READ_NORMAL ) {
 371                         $data = $this->pageDataFromTitle( wfGetDB( DB_SLAVE ), $this->mTitle );
 372                         // Use a "last rev inserted" timestamp key to diminish the issue of slave lag.
 373                         // Note that DB also stores the master position in the session and checks it.
 374                         $touched = $this->getCachedLastEditTime();
 375                         if ( $touched ) { // key set
 376                                 if ( !$data || $touched > wfTimestamp( TS_MW, $data->page_touched ) ) {
 377                                         $from = self::READ_LATEST;
 378                                         $data = $this->pageDataFromTitle( wfGetDB( DB_MASTER ), $this->mTitle );
 379                                 }
 380                         }
 381                 } else {
 382                         // No idea from where the caller got this data, assume slave database.
 383                         $data = $from;
 384                         $from = self::READ_NORMAL;
 385                 }
 386
 387                 $this->loadFromRow( $data, $from );
 388         }
 389
 390         /**
 391          * Load the object from a database row
 392          *
 393          * @since 1.20
 394          * @param object $data Database row containing at least fields returned by selectFields()
 395          * @param string|int $from One of the following:
 396          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a slave DB
 397          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 398          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 399          *          the master DB using SELECT FOR UPDATE
 400          */
 401         public function loadFromRow( $data, $from ) {
 402                 $lc = LinkCache::singleton();
 403                 $lc->clearLink( $this->mTitle );
 404
 405                 if ( $data ) {
 406                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 407
 408                         $this->mTitle->loadFromRow( $data );
 409
 410                         // Old-fashioned restrictions
 411                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 412
 413                         $this->mId = intval( $data->page_id );
 414                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 415                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 416                         $this->mIsRedirect = intval( $data->page_is_redirect );
 417                         $this->mLatest = intval( $data->page_latest );
 418                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 419                         // Double-check the ID of any cached latest Revision object for consistency.
 420                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 421                                 $this->mLastRevision = null;
 422                                 $this->mTimestamp = '';
 423                         }
 424                 } else {
 425                         $lc->addBadLinkObj( $this->mTitle );
 426
 427                         $this->mTitle->loadFromRow( false );
 428
 429                         $this->clearCacheFields();
 430
 431                         $this->mId = 0;
 432                 }
 433
 434                 $this->mDataLoaded = true;
 435                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 436         }
 437
 438         /**
 439          * @return int Page ID
 440          */
 441         public function getId() {
 442                 if ( !$this->mDataLoaded ) {
 443                         $this->loadPageData();
 444                 }
 445                 return $this->mId;
 446         }
 447
 448         /**
 449          * @return bool Whether or not the page exists in the database
 450          */
 451         public function exists() {
 452                 if ( !$this->mDataLoaded ) {
 453                         $this->loadPageData();
 454                 }
 455                 return $this->mId > 0;
 456         }
 457
 458         /**
 459          * Check if this page is something we're going to be showing
 460          * some sort of sensible content for. If we return false, page
 461          * views (plain action=view) will return an HTTP 404 response,
 462          * so spiders and robots can know they're following a bad link.
 463          *
 464          * @return bool
 465          */
 466         public function hasViewableContent() {
 467                 return $this->exists() || $this->mTitle->isAlwaysKnown();
 468         }
 469
 470         /**
 471          * Tests if the article content represents a redirect
 472          *
 473          * @return bool
 474          */
 475         public function isRedirect() {
 476                 $content = $this->getContent();
 477                 if ( !$content ) {
 478                         return false;
 479                 }
 480
 481                 return $content->isRedirect();
 482         }
 483
 484         /**
 485          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 486          *
 487          * Will use the revisions actual content model if the page exists,
 488          * and the page's default if the page doesn't exist yet.
 489          *
 490          * @return string
 491          *
 492          * @since 1.21
 493          */
 494         public function getContentModel() {
 495                 if ( $this->exists() ) {
 496                         // look at the revision's actual content model
 497                         $rev = $this->getRevision();
 498
 499                         if ( $rev !== null ) {
 500                                 return $rev->getContentModel();
 501                         } else {
 502                                 $title = $this->mTitle->getPrefixedDBkey();
 503                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 504                         }
 505                 }
 506
 507                 // use the default model for this page
 508                 return $this->mTitle->getContentModel();
 509         }
 510
 511         /**
 512          * Loads page_touched and returns a value indicating if it should be used
 513          * @return bool True if not a redirect
 514          */
 515         public function checkTouched() {
 516                 if ( !$this->mDataLoaded ) {
 517                         $this->loadPageData();
 518                 }
 519                 return !$this->mIsRedirect;
 520         }
 521
 522         /**
 523          * Get the page_touched field
 524          * @return string Containing GMT timestamp
 525          */
 526         public function getTouched() {
 527                 if ( !$this->mDataLoaded ) {
 528                         $this->loadPageData();
 529                 }
 530                 return $this->mTouched;
 531         }
 532
 533         /**
 534          * Get the page_links_updated field
 535          * @return string|null Containing GMT timestamp
 536          */
 537         public function getLinksTimestamp() {
 538                 if ( !$this->mDataLoaded ) {
 539                         $this->loadPageData();
 540                 }
 541                 return $this->mLinksUpdated;
 542         }
 543
 544         /**
 545          * Get the page_latest field
 546          * @return int The rev_id of current revision
 547          */
 548         public function getLatest() {
 549                 if ( !$this->mDataLoaded ) {
 550                         $this->loadPageData();
 551                 }
 552                 return (int)$this->mLatest;
 553         }
 554
 555         /**
 556          * Get the Revision object of the oldest revision
 557          * @return Revision|null
 558          */
 559         public function getOldestRevision() {
 560                 wfProfileIn( __METHOD__ );
 561
 562                 // Try using the slave database first, then try the master
 563                 $continue = 2;
 564                 $db = wfGetDB( DB_SLAVE );
 565                 $revSelectFields = Revision::selectFields();
 566
 567                 $row = null;
 568                 while ( $continue ) {
 569                         $row = $db->selectRow(
 570                                 array( 'page', 'revision' ),
 571                                 $revSelectFields,
 572                                 array(
 573                                         'page_namespace' => $this->mTitle->getNamespace(),
 574                                         'page_title' => $this->mTitle->getDBkey(),
 575                                         'rev_page = page_id'
 576                                 ),
 577                                 __METHOD__,
 578                                 array(
 579                                         'ORDER BY' => 'rev_timestamp ASC'
 580                                 )
 581                         );
 582
 583                         if ( $row ) {
 584                                 $continue = 0;
 585                         } else {
 586                                 $db = wfGetDB( DB_MASTER );
 587                                 $continue--;
 588                         }
 589                 }
 590
 591                 wfProfileOut( __METHOD__ );
 592                 return $row ? Revision::newFromRow( $row ) : null;
 593         }
 594
 595         /**
 596          * Loads everything except the text
 597          * This isn't necessary for all uses, so it's only done if needed.
 598          */
 599         protected function loadLastEdit() {
 600                 if ( $this->mLastRevision !== null ) {
 601                         return; // already loaded
 602                 }
 603
 604                 $latest = $this->getLatest();
 605                 if ( !$latest ) {
 606                         return; // page doesn't exist or is missing page_latest info
 607                 }
 608
 609                 // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always includes the
 610                 // latest changes committed. This is true even within REPEATABLE-READ transactions, where
 611                 // S1 normally only sees changes committed before the first S1 SELECT. Thus we need S1 to
 612                 // also gets the revision row FOR UPDATE; otherwise, it may not find it since a page row
 613                 // UPDATE and revision row INSERT by S2 may have happened after the first S1 SELECT.
 614                 // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read.
 615                 $flags = ( $this->mDataLoadedFrom == self::READ_LOCKING ) ? Revision::READ_LOCKING : 0;
 616                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 617                 if ( $revision ) { // sanity
 618                         $this->setLastEdit( $revision );
 619                 }
 620         }
 621
 622         /**
 623          * Set the latest revision
 624          * @param Revision $revision
 625          */
 626         protected function setLastEdit( Revision $revision ) {
 627                 $this->mLastRevision = $revision;
 628                 $this->mTimestamp = $revision->getTimestamp();
 629         }
 630
 631         /**
 632          * Get the latest revision
 633          * @return Revision|null
 634          */
 635         public function getRevision() {
 636                 $this->loadLastEdit();
 637                 if ( $this->mLastRevision ) {
 638                         return $this->mLastRevision;
 639                 }
 640                 return null;
 641         }
 642
 643         /**
 644          * Get the content of the current revision. No side-effects...
 645          *
 646          * @param int $audience One of:
 647          *   Revision::FOR_PUBLIC       to be displayed to all users
 648          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 649          *   Revision::RAW              get the text regardless of permissions
 650          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 651          *   to the $audience parameter
 652          * @return Content|null The content of the current revision
 653          *
 654          * @since 1.21
 655          */
 656         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 657                 $this->loadLastEdit();
 658                 if ( $this->mLastRevision ) {
 659                         return $this->mLastRevision->getContent( $audience, $user );
 660                 }
 661                 return null;
 662         }
 663
 664         /**
 665          * Get the text of the current revision. No side-effects...
 666          *
 667          * @param int $audience One of:
 668          *   Revision::FOR_PUBLIC       to be displayed to all users
 669          *   Revision::FOR_THIS_USER    to be displayed to the given user
 670          *   Revision::RAW              get the text regardless of permissions
 671          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 672          *   to the $audience parameter
 673          * @return string|bool The text of the current revision
 674          * @deprecated since 1.21, getContent() should be used instead.
 675          */
 676         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 677                 ContentHandler::deprecated( __METHOD__, '1.21' );
 678
 679                 $this->loadLastEdit();
 680                 if ( $this->mLastRevision ) {
 681                         return $this->mLastRevision->getText( $audience, $user );
 682                 }
 683                 return false;
 684         }
 685
 686         /**
 687          * Get the text of the current revision. No side-effects...
 688          *
 689          * @return string|bool The text of the current revision. False on failure
 690          * @deprecated since 1.21, getContent() should be used instead.
 691          */
 692         public function getRawText() {
 693                 ContentHandler::deprecated( __METHOD__, '1.21' );
 694
 695                 return $this->getText( Revision::RAW );
 696         }
 697
 698         /**
 699          * @return string MW timestamp of last article revision
 700          */
 701         public function getTimestamp() {
 702                 // Check if the field has been filled by WikiPage::setTimestamp()
 703                 if ( !$this->mTimestamp ) {
 704                         $this->loadLastEdit();
 705                 }
 706
 707                 return wfTimestamp( TS_MW, $this->mTimestamp );
 708         }
 709
 710         /**
 711          * Set the page timestamp (use only to avoid DB queries)
 712          * @param string $ts MW timestamp of last article revision
 713          * @return void
 714          */
 715         public function setTimestamp( $ts ) {
 716                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 717         }
 718
 719         /**
 720          * @param int $audience One of:
 721          *   Revision::FOR_PUBLIC       to be displayed to all users
 722          *   Revision::FOR_THIS_USER    to be displayed to the given user
 723          *   Revision::RAW              get the text regardless of permissions
 724          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 725          *   to the $audience parameter
 726          * @return int User ID for the user that made the last article revision
 727          */
 728         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 729                 $this->loadLastEdit();
 730                 if ( $this->mLastRevision ) {
 731                         return $this->mLastRevision->getUser( $audience, $user );
 732                 } else {
 733                         return -1;
 734                 }
 735         }
 736
 737         /**
 738          * Get the User object of the user who created the page
 739          * @param int $audience One of:
 740          *   Revision::FOR_PUBLIC       to be displayed to all users
 741          *   Revision::FOR_THIS_USER    to be displayed to the given user
 742          *   Revision::RAW              get the text regardless of permissions
 743          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 744          *   to the $audience parameter
 745          * @return User|null
 746          */
 747         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 748                 $revision = $this->getOldestRevision();
 749                 if ( $revision ) {
 750                         $userName = $revision->getUserText( $audience, $user );
 751                         return User::newFromName( $userName, false );
 752                 } else {
 753                         return null;
 754                 }
 755         }
 756
 757         /**
 758          * @param int $audience One of:
 759          *   Revision::FOR_PUBLIC       to be displayed to all users
 760          *   Revision::FOR_THIS_USER    to be displayed to the given user
 761          *   Revision::RAW              get the text regardless of permissions
 762          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 763          *   to the $audience parameter
 764          * @return string Username of the user that made the last article revision
 765          */
 766         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 767                 $this->loadLastEdit();
 768                 if ( $this->mLastRevision ) {
 769                         return $this->mLastRevision->getUserText( $audience, $user );
 770                 } else {
 771                         return '';
 772                 }
 773         }
 774
 775         /**
 776          * @param int $audience One of:
 777          *   Revision::FOR_PUBLIC       to be displayed to all users
 778          *   Revision::FOR_THIS_USER    to be displayed to the given user
 779          *   Revision::RAW              get the text regardless of permissions
 780          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 781          *   to the $audience parameter
 782          * @return string Comment stored for the last article revision
 783          */
 784         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 785                 $this->loadLastEdit();
 786                 if ( $this->mLastRevision ) {
 787                         return $this->mLastRevision->getComment( $audience, $user );
 788                 } else {
 789                         return '';
 790                 }
 791         }
 792
 793         /**
 794          * Returns true if last revision was marked as "minor edit"
 795          *
 796          * @return bool Minor edit indicator for the last article revision.
 797          */
 798         public function getMinorEdit() {
 799                 $this->loadLastEdit();
 800                 if ( $this->mLastRevision ) {
 801                         return $this->mLastRevision->isMinor();
 802                 } else {
 803                         return false;
 804                 }
 805         }
 806
 807         /**
 808          * Get the cached timestamp for the last time the page changed.
 809          * This is only used to help handle slave lag by comparing to page_touched.
 810          * @return string MW timestamp
 811          */
 812         protected function getCachedLastEditTime() {
 813                 global $wgMemc;
 814                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 815                 return $wgMemc->get( $key );
 816         }
 817
 818         /**
 819          * Set the cached timestamp for the last time the page changed.
 820          * This is only used to help handle slave lag by comparing to page_touched.
 821          * @param string $timestamp
 822          * @return void
 823          */
 824         public function setCachedLastEditTime( $timestamp ) {
 825                 global $wgMemc;
 826                 $key = wfMemcKey( 'page-lastedit', md5( $this->mTitle->getPrefixedDBkey() ) );
 827                 $wgMemc->set( $key, wfTimestamp( TS_MW, $timestamp ), 60 * 15 );
 828         }
 829
 830         /**
 831          * Determine whether a page would be suitable for being counted as an
 832          * article in the site_stats table based on the title & its content
 833          *
 834          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 835          *   if false, the current database state will be used
 836          * @return bool
 837          */
 838         public function isCountable( $editInfo = false ) {
 839                 global $wgArticleCountMethod;
 840
 841                 if ( !$this->mTitle->isContentPage() ) {
 842                         return false;
 843                 }
 844
 845                 if ( $editInfo ) {
 846                         $content = $editInfo->pstContent;
 847                 } else {
 848                         $content = $this->getContent();
 849                 }
 850
 851                 if ( !$content || $content->isRedirect() ) {
 852                         return false;
 853                 }
 854
 855                 $hasLinks = null;
 856
 857                 if ( $wgArticleCountMethod === 'link' ) {
 858                         // nasty special case to avoid re-parsing to detect links
 859
 860                         if ( $editInfo ) {
 861                                 // ParserOutput::getLinks() is a 2D array of page links, so
 862                                 // to be really correct we would need to recurse in the array
 863                                 // but the main array should only have items in it if there are
 864                                 // links.
 865                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 866                         } else {
 867                                 $hasLinks = (bool)wfGetDB( DB_SLAVE )->selectField( 'pagelinks', 1,
 868                                         array( 'pl_from' => $this->getId() ), __METHOD__ );
 869                         }
 870                 }
 871
 872                 return $content->isCountable( $hasLinks );
 873         }
 874
 875         /**
 876          * If this page is a redirect, get its target
 877          *
 878          * The target will be fetched from the redirect table if possible.
 879          * If this page doesn't have an entry there, call insertRedirect()
 880          * @return Title|null Title object, or null if this page is not a redirect
 881          */
 882         public function getRedirectTarget() {
 883                 if ( !$this->mTitle->isRedirect() ) {
 884                         return null;
 885                 }
 886
 887                 if ( $this->mRedirectTarget !== null ) {
 888                         return $this->mRedirectTarget;
 889                 }
 890
 891                 // Query the redirect table
 892                 $dbr = wfGetDB( DB_SLAVE );
 893                 $row = $dbr->selectRow( 'redirect',
 894                         array( 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ),
 895                         array( 'rd_from' => $this->getId() ),
 896                         __METHOD__
 897                 );
 898
 899                 // rd_fragment and rd_interwiki were added later, populate them if empty
 900                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 901                         $this->mRedirectTarget = Title::makeTitle(
 902                                 $row->rd_namespace, $row->rd_title,
 903                                 $row->rd_fragment, $row->rd_interwiki );
 904                         return $this->mRedirectTarget;
 905                 }
 906
 907                 // This page doesn't have an entry in the redirect table
 908                 $this->mRedirectTarget = $this->insertRedirect();
 909                 return $this->mRedirectTarget;
 910         }
 911
 912         /**
 913          * Insert an entry for this page into the redirect table.
 914          *
 915          * Don't call this function directly unless you know what you're doing.
 916          * @return Title|null Title object or null if not a redirect
 917          */
 918         public function insertRedirect() {
 919                 // recurse through to only get the final target
 920                 $content = $this->getContent();
 921                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 922                 if ( !$retval ) {
 923                         return null;
 924                 }
 925                 $this->insertRedirectEntry( $retval );
 926                 return $retval;
 927         }
 928
 929         /**
 930          * Insert or update the redirect table entry for this page to indicate
 931          * it redirects to $rt .
 932          * @param Title $rt Redirect target
 933          */
 934         public function insertRedirectEntry( $rt ) {
 935                 $dbw = wfGetDB( DB_MASTER );
 936                 $dbw->replace( 'redirect', array( 'rd_from' ),
 937                         array(
 938                                 'rd_from' => $this->getId(),
 939                                 'rd_namespace' => $rt->getNamespace(),
 940                                 'rd_title' => $rt->getDBkey(),
 941                                 'rd_fragment' => $rt->getFragment(),
 942                                 'rd_interwiki' => $rt->getInterwiki(),
 943                         ),
 944                         __METHOD__
 945                 );
 946         }
 947
 948         /**
 949          * Get the Title object or URL this page redirects to
 950          *
 951          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 952          */
 953         public function followRedirect() {
 954                 return $this->getRedirectURL( $this->getRedirectTarget() );
 955         }
 956
 957         /**
 958          * Get the Title object or URL to use for a redirect. We use Title
 959          * objects for same-wiki, non-special redirects and URLs for everything
 960          * else.
 961          * @param Title $rt Redirect target
 962          * @return bool|Title|string False, Title object of local target, or string with URL
 963          */
 964         public function getRedirectURL( $rt ) {
 965                 if ( !$rt ) {
 966                         return false;
 967                 }
 968
 969                 if ( $rt->isExternal() ) {
 970                         if ( $rt->isLocal() ) {
 971                                 // Offsite wikis need an HTTP redirect.
 972                                 //
 973                                 // This can be hard to reverse and may produce loops,
 974                                 // so they may be disabled in the site configuration.
 975                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 976                                 return $rt->getFullURL( array( 'rdfrom' => $source ) );
 977                         } else {
 978                                 // External pages without "local" bit set are not valid
 979                                 // redirect targets
 980                                 return false;
 981                         }
 982                 }
 983
 984                 if ( $rt->isSpecialPage() ) {
 985                         // Gotta handle redirects to special pages differently:
 986                         // Fill the HTTP response "Location" header and ignore
 987                         // the rest of the page we're on.
 988                         //
 989                         // Some pages are not valid targets
 990                         if ( $rt->isValidRedirectTarget() ) {
 991                                 return $rt->getFullURL();
 992                         } else {
 993                                 return false;
 994                         }
 995                 }
 996
 997                 return $rt;
 998         }
 999
1000         /**
1001          * Get a list of users who have edited this article, not including the user who made
1002          * the most recent revision, which you can get from $article->getUser() if you want it
1003          * @return UserArrayFromResult
1004          */
1005         public function getContributors() {
1006                 // @todo FIXME: This is expensive; cache this info somewhere.
1007
1008                 $dbr = wfGetDB( DB_SLAVE );
1009
1010                 if ( $dbr->implicitGroupby() ) {
1011                         $realNameField = 'user_real_name';
1012                 } else {
1013                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1014                 }
1015
1016                 $tables = array( 'revision', 'user' );
1017
1018                 $fields = array(
1019                         'user_id' => 'rev_user',
1020                         'user_name' => 'rev_user_text',
1021                         $realNameField,
1022                         'timestamp' => 'MAX(rev_timestamp)',
1023                 );
1024
1025                 $conds = array( 'rev_page' => $this->getId() );
1026
1027                 // The user who made the top revision gets credited as "this page was last edited by
1028                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1029                 $user = $this->getUser();
1030                 if ( $user ) {
1031                         $conds[] = "rev_user != $user";
1032                 } else {
1033                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1034                 }
1035
1036                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0"; // username hidden?
1037
1038                 $jconds = array(
1039                         'user' => array( 'LEFT JOIN', 'rev_user = user_id' ),
1040                 );
1041
1042                 $options = array(
1043                         'GROUP BY' => array( 'rev_user', 'rev_user_text' ),
1044                         'ORDER BY' => 'timestamp DESC',
1045                 );
1046
1047                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1048                 return new UserArrayFromResult( $res );
1049         }
1050
1051         /**
1052          * Get the last N authors
1053          * @param int $num Number of revisions to get
1054          * @param int|string $revLatest The latest rev_id, selected from the master (optional)
1055          * @return array Array of authors, duplicates not removed
1056          */
1057         public function getLastNAuthors( $num, $revLatest = 0 ) {
1058                 wfProfileIn( __METHOD__ );
1059                 // First try the slave
1060                 // If that doesn't have the latest revision, try the master
1061                 $continue = 2;
1062                 $db = wfGetDB( DB_SLAVE );
1063
1064                 do {
1065                         $res = $db->select( array( 'page', 'revision' ),
1066                                 array( 'rev_id', 'rev_user_text' ),
1067                                 array(
1068                                         'page_namespace' => $this->mTitle->getNamespace(),
1069                                         'page_title' => $this->mTitle->getDBkey(),
1070                                         'rev_page = page_id'
1071                                 ), __METHOD__,
1072                                 array(
1073                                         'ORDER BY' => 'rev_timestamp DESC',
1074                                         'LIMIT' => $num
1075                                 )
1076                         );
1077
1078                         if ( !$res ) {
1079                                 wfProfileOut( __METHOD__ );
1080                                 return array();
1081                         }
1082
1083                         $row = $db->fetchObject( $res );
1084
1085                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1086                                 $db = wfGetDB( DB_MASTER );
1087                                 $continue--;
1088                         } else {
1089                                 $continue = 0;
1090                         }
1091                 } while ( $continue );
1092
1093                 $authors = array( $row->rev_user_text );
1094
1095                 foreach ( $res as $row ) {
1096                         $authors[] = $row->rev_user_text;
1097                 }
1098
1099                 wfProfileOut( __METHOD__ );
1100                 return $authors;
1101         }
1102
1103         /**
1104          * Should the parser cache be used?
1105          *
1106          * @param ParserOptions $parserOptions ParserOptions to check
1107          * @param int $oldid
1108          * @return bool
1109          */
1110         public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
1111                 global $wgEnableParserCache;
1112
1113                 return $wgEnableParserCache
1114                         && $parserOptions->getStubThreshold() == 0
1115                         && $this->exists()
1116                         && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
1117                         && $this->getContentHandler()->isParserCacheSupported();
1118         }
1119
1120         /**
1121          * Get a ParserOutput for the given ParserOptions and revision ID.
1122          * The parser cache will be used if possible.
1123          *
1124          * @since 1.19
1125          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1126          * @param null|int $oldid Revision ID to get the text from, passing null or 0 will
1127          *   get the current revision (default value)
1128          *
1129          * @return ParserOutput|bool ParserOutput or false if the revision was not found
1130          */
1131         public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
1132                 wfProfileIn( __METHOD__ );
1133
1134                 $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
1135                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1136                 if ( $parserOptions->getStubThreshold() ) {
1137                         wfIncrStats( 'pcache_miss_stub' );
1138                 }
1139
1140                 if ( $useParserCache ) {
1141                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1142                         if ( $parserOutput !== false ) {
1143                                 wfProfileOut( __METHOD__ );
1144                                 return $parserOutput;
1145                         }
1146                 }
1147
1148                 if ( $oldid === null || $oldid === 0 ) {
1149                         $oldid = $this->getLatest();
1150                 }
1151
1152                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1153                 $pool->execute();
1154
1155                 wfProfileOut( __METHOD__ );
1156
1157                 return $pool->getParserOutput();
1158         }
1159
1160         /**
1161          * Do standard deferred updates after page view (existing or missing page)
1162          * @param User $user The relevant user
1163          * @param int $oldid The revision id being viewed. If not given or 0, latest revision is assumed.
1164          */
1165         public function doViewUpdates( User $user, $oldid = 0 ) {
1166                 if ( wfReadOnly() ) {
1167                         return;
1168                 }
1169
1170                 // Update newtalk / watchlist notification status
1171                 $user->clearNotification( $this->mTitle, $oldid );
1172         }
1173
1174         /**
1175          * Perform the actions of a page purging
1176          * @return bool
1177          */
1178         public function doPurge() {
1179                 global $wgUseSquid;
1180
1181                 if ( !Hooks::run( 'ArticlePurge', array( &$this ) ) ) {
1182                         return false;
1183                 }
1184
1185                 // Invalidate the cache
1186                 $this->mTitle->invalidateCache();
1187
1188                 if ( $wgUseSquid ) {
1189                         // Commit the transaction before the purge is sent
1190                         $dbw = wfGetDB( DB_MASTER );
1191                         $dbw->commit( __METHOD__ );
1192
1193                         // Send purge
1194                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
1195                         $update->doUpdate();
1196                 }
1197
1198                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1199                         // @todo move this logic to MessageCache
1200
1201                         if ( $this->exists() ) {
1202                                 // NOTE: use transclusion text for messages.
1203                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1204
1205                                 $content = $this->getContent();
1206                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1207
1208                                 if ( $text === null ) {
1209                                         $text = false;
1210                                 }
1211                         } else {
1212                                 $text = false;
1213                         }
1214
1215                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1216                 }
1217                 return true;
1218         }
1219
1220         /**
1221          * Insert a new empty page record for this article.
1222          * This *must* be followed up by creating a revision
1223          * and running $this->updateRevisionOn( ... );
1224          * or else the record will be left in a funky state.
1225          * Best if all done inside a transaction.
1226          *
1227          * @param DatabaseBase $dbw
1228          * @return int The newly created page_id key, or false if the title already existed
1229          */
1230         public function insertOn( $dbw ) {
1231                 wfProfileIn( __METHOD__ );
1232
1233                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
1234                 $dbw->insert( 'page', array(
1235                         'page_id'           => $page_id,
1236                         'page_namespace'    => $this->mTitle->getNamespace(),
1237                         'page_title'        => $this->mTitle->getDBkey(),
1238                         'page_restrictions' => '',
1239                         'page_is_redirect'  => 0, // Will set this shortly...
1240                         'page_is_new'       => 1,
1241                         'page_random'       => wfRandom(),
1242                         'page_touched'      => $dbw->timestamp(),
1243                         'page_latest'       => 0, // Fill this in shortly...
1244                         'page_len'          => 0, // Fill this in shortly...
1245                 ), __METHOD__, 'IGNORE' );
1246
1247                 $affected = $dbw->affectedRows();
1248
1249                 if ( $affected ) {
1250                         $newid = $dbw->insertId();
1251                         $this->mId = $newid;
1252                         $this->mTitle->resetArticleID( $newid );
1253                 }
1254                 wfProfileOut( __METHOD__ );
1255
1256                 return $affected ? $newid : false;
1257         }
1258
1259         /**
1260          * Update the page record to point to a newly saved revision.
1261          *
1262          * @param DatabaseBase $dbw
1263          * @param Revision $revision For ID number, and text used to set
1264          *   length and redirect status fields
1265          * @param int $lastRevision If given, will not overwrite the page field
1266          *   when different from the currently set value.
1267          *   Giving 0 indicates the new page flag should be set on.
1268          * @param bool $lastRevIsRedirect If given, will optimize adding and
1269          *   removing rows in redirect table.
1270          * @return bool True on success, false on failure
1271          */
1272         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1273                 $lastRevIsRedirect = null
1274         ) {
1275                 global $wgContentHandlerUseDB;
1276
1277                 wfProfileIn( __METHOD__ );
1278
1279                 $content = $revision->getContent();
1280                 $len = $content ? $content->getSize() : 0;
1281                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1282
1283                 $conditions = array( 'page_id' => $this->getId() );
1284
1285                 if ( !is_null( $lastRevision ) ) {
1286                         // An extra check against threads stepping on each other
1287                         $conditions['page_latest'] = $lastRevision;
1288                 }
1289
1290                 $now = wfTimestampNow();
1291                 $row = array( /* SET */
1292                         'page_latest'      => $revision->getId(),
1293                         'page_touched'     => $dbw->timestamp( $now ),
1294                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1295                         'page_is_redirect' => $rt !== null ? 1 : 0,
1296                         'page_len'         => $len,
1297                 );
1298
1299                 if ( $wgContentHandlerUseDB ) {
1300                         $row['page_content_model'] = $revision->getContentModel();
1301                 }
1302
1303                 $dbw->update( 'page',
1304                         $row,
1305                         $conditions,
1306                         __METHOD__ );
1307
1308                 $result = $dbw->affectedRows() > 0;
1309                 if ( $result ) {
1310                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1311                         $this->setLastEdit( $revision );
1312                         $this->setCachedLastEditTime( $now );
1313                         $this->mLatest = $revision->getId();
1314                         $this->mIsRedirect = (bool)$rt;
1315                         // Update the LinkCache.
1316                         LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect,
1317                                                                                                         $this->mLatest, $revision->getContentModel() );
1318                 }
1319
1320                 wfProfileOut( __METHOD__ );
1321                 return $result;
1322         }
1323
1324         /**
1325          * Add row to the redirect table if this is a redirect, remove otherwise.
1326          *
1327          * @param DatabaseBase $dbw
1328          * @param Title $redirectTitle Title object pointing to the redirect target,
1329          *   or NULL if this is not a redirect
1330          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1331          *   removing rows in redirect table.
1332          * @return bool True on success, false on failure
1333          * @private
1334          */
1335         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1336                 // Always update redirects (target link might have changed)
1337                 // Update/Insert if we don't know if the last revision was a redirect or not
1338                 // Delete if changing from redirect to non-redirect
1339                 $isRedirect = !is_null( $redirectTitle );
1340
1341                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1342                         return true;
1343                 }
1344
1345                 wfProfileIn( __METHOD__ );
1346                 if ( $isRedirect ) {
1347                         $this->insertRedirectEntry( $redirectTitle );
1348                 } else {
1349                         // This is not a redirect, remove row from redirect table
1350                         $where = array( 'rd_from' => $this->getId() );
1351                         $dbw->delete( 'redirect', $where, __METHOD__ );
1352                 }
1353
1354                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1355                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1356                 }
1357                 wfProfileOut( __METHOD__ );
1358
1359                 return ( $dbw->affectedRows() != 0 );
1360         }
1361
1362         /**
1363          * If the given revision is newer than the currently set page_latest,
1364          * update the page record. Otherwise, do nothing.
1365          *
1366          * @deprecated since 1.24, use updateRevisionOn instead
1367          *
1368          * @param DatabaseBase $dbw
1369          * @param Revision $revision
1370          * @return bool
1371          */
1372         public function updateIfNewerOn( $dbw, $revision ) {
1373                 wfProfileIn( __METHOD__ );
1374
1375                 $row = $dbw->selectRow(
1376                         array( 'revision', 'page' ),
1377                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1378                         array(
1379                                 'page_id' => $this->getId(),
1380                                 'page_latest=rev_id' ),
1381                         __METHOD__ );
1382
1383                 if ( $row ) {
1384                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1385                                 wfProfileOut( __METHOD__ );
1386                                 return false;
1387                         }
1388                         $prev = $row->rev_id;
1389                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1390                 } else {
1391                         // No or missing previous revision; mark the page as new
1392                         $prev = 0;
1393                         $lastRevIsRedirect = null;
1394                 }
1395
1396                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1397
1398                 wfProfileOut( __METHOD__ );
1399                 return $ret;
1400         }
1401
1402         /**
1403          * Get the content that needs to be saved in order to undo all revisions
1404          * between $undo and $undoafter. Revisions must belong to the same page,
1405          * must exist and must not be deleted
1406          * @param Revision $undo
1407          * @param Revision $undoafter Must be an earlier revision than $undo
1408          * @return mixed String on success, false on failure
1409          * @since 1.21
1410          * Before we had the Content object, this was done in getUndoText
1411          */
1412         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1413                 $handler = $undo->getContentHandler();
1414                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1415         }
1416
1417         /**
1418          * Get the text that needs to be saved in order to undo all revisions
1419          * between $undo and $undoafter. Revisions must belong to the same page,
1420          * must exist and must not be deleted
1421          * @param Revision $undo
1422          * @param Revision $undoafter Must be an earlier revision than $undo
1423          * @return string|bool String on success, false on failure
1424          * @deprecated since 1.21: use ContentHandler::getUndoContent() instead.
1425          */
1426         public function getUndoText( Revision $undo, Revision $undoafter = null ) {
1427                 ContentHandler::deprecated( __METHOD__, '1.21' );
1428
1429                 $this->loadLastEdit();
1430
1431                 if ( $this->mLastRevision ) {
1432                         if ( is_null( $undoafter ) ) {
1433                                 $undoafter = $undo->getPrevious();
1434                         }
1435
1436                         $handler = $this->getContentHandler();
1437                         $undone = $handler->getUndoContent( $this->mLastRevision, $undo, $undoafter );
1438
1439                         if ( !$undone ) {
1440                                 return false;
1441                         } else {
1442                                 return ContentHandler::getContentText( $undone );
1443                         }
1444                 }
1445
1446                 return false;
1447         }
1448
1449         /**
1450          * @param string|number|null|bool $sectionId Section identifier as a number or string
1451          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1452          * or 'new' for a new section.
1453          * @param string $text New text of the section.
1454          * @param string $sectionTitle New section's subject, only if $section is "new".
1455          * @param string $edittime Revision timestamp or null to use the current revision.
1456          *
1457          * @throws MWException
1458          * @return string New complete article text, or null if error.
1459          *
1460          * @deprecated since 1.21, use replaceSectionAtRev() instead
1461          */
1462         public function replaceSection( $sectionId, $text, $sectionTitle = '',
1463                 $edittime = null
1464         ) {
1465                 ContentHandler::deprecated( __METHOD__, '1.21' );
1466
1467                 //NOTE: keep condition in sync with condition in replaceSectionContent!
1468                 if ( strval( $sectionId ) === '' ) {
1469                         // Whole-page edit; let the whole text through
1470                         return $text;
1471                 }
1472
1473                 if ( !$this->supportsSections() ) {
1474                         throw new MWException( "sections not supported for content model " .
1475                                 $this->getContentHandler()->getModelID() );
1476                 }
1477
1478                 // could even make section title, but that's not required.
1479                 $sectionContent = ContentHandler::makeContent( $text, $this->getTitle() );
1480
1481                 $newContent = $this->replaceSectionContent( $sectionId, $sectionContent, $sectionTitle,
1482                         $edittime );
1483
1484                 return ContentHandler::getContentText( $newContent );
1485         }
1486
1487         /**
1488          * Returns true if this page's content model supports sections.
1489          *
1490          * @return bool
1491          *
1492          * @todo The skin should check this and not offer section functionality if
1493          *   sections are not supported.
1494          * @todo The EditPage should check this and not offer section functionality
1495          *   if sections are not supported.
1496          */
1497         public function supportsSections() {
1498                 return $this->getContentHandler()->supportsSections();
1499         }
1500
1501         /**
1502          * @param string|number|null|bool $sectionId Section identifier as a number or string
1503          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1504          * or 'new' for a new section.
1505          * @param Content $sectionContent New content of the section.
1506          * @param string $sectionTitle New section's subject, only if $section is "new".
1507          * @param string $edittime Revision timestamp or null to use the current revision.
1508          *
1509          * @throws MWException
1510          * @return Content New complete article content, or null if error.
1511          *
1512          * @since 1.21
1513          * @deprecated since 1.24, use replaceSectionAtRev instead
1514          */
1515         public function replaceSectionContent( $sectionId, Content $sectionContent, $sectionTitle = '',
1516                 $edittime = null ) {
1517                 wfProfileIn( __METHOD__ );
1518
1519                 $baseRevId = null;
1520                 if ( $edittime && $sectionId !== 'new' ) {
1521                         $dbw = wfGetDB( DB_MASTER );
1522                         $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1523                         if ( $rev ) {
1524                                 $baseRevId = $rev->getId();
1525                         }
1526                 }
1527
1528                 wfProfileOut( __METHOD__ );
1529                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1530         }
1531
1532         /**
1533          * @param string|number|null|bool $sectionId Section identifier as a number or string
1534          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1535          * or 'new' for a new section.
1536          * @param Content $sectionContent New content of the section.
1537          * @param string $sectionTitle New section's subject, only if $section is "new".
1538          * @param int|null $baseRevId
1539          *
1540          * @throws MWException
1541          * @return Content New complete article content, or null if error.
1542          *
1543          * @since 1.24
1544          */
1545         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1546                 $sectionTitle = '', $baseRevId = null
1547         ) {
1548                 wfProfileIn( __METHOD__ );
1549
1550                 if ( strval( $sectionId ) === '' ) {
1551                         // Whole-page edit; let the whole text through
1552                         $newContent = $sectionContent;
1553                 } else {
1554                         if ( !$this->supportsSections() ) {
1555                                 wfProfileOut( __METHOD__ );
1556                                 throw new MWException( "sections not supported for content model " .
1557                                         $this->getContentHandler()->getModelID() );
1558                         }
1559
1560                         // Bug 30711: always use current version when adding a new section
1561                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1562                                 $oldContent = $this->getContent();
1563                         } else {
1564                                 // TODO: try DB_SLAVE first
1565                                 $dbw = wfGetDB( DB_MASTER );
1566                                 $rev = Revision::loadFromId( $dbw, $baseRevId );
1567
1568                                 if ( !$rev ) {
1569                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1570                                                 $this->getId() . "; section: $sectionId)\n" );
1571                                         wfProfileOut( __METHOD__ );
1572                                         return null;
1573                                 }
1574
1575                                 $oldContent = $rev->getContent();
1576                         }
1577
1578                         if ( !$oldContent ) {
1579                                 wfDebug( __METHOD__ . ": no page text\n" );
1580                                 wfProfileOut( __METHOD__ );
1581                                 return null;
1582                         }
1583
1584                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1585                 }
1586
1587                 wfProfileOut( __METHOD__ );
1588                 return $newContent;
1589         }
1590
1591         /**
1592          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1593          * @param int $flags
1594          * @return int Updated $flags
1595          */
1596         public function checkFlags( $flags ) {
1597                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1598                         if ( $this->exists() ) {
1599                                 $flags |= EDIT_UPDATE;
1600                         } else {
1601                                 $flags |= EDIT_NEW;
1602                         }
1603                 }
1604
1605                 return $flags;
1606         }
1607
1608         /**
1609          * Change an existing article or create a new article. Updates RC and all necessary caches,
1610          * optionally via the deferred update array.
1611          *
1612          * @param string $text New text
1613          * @param string $summary Edit summary
1614          * @param int $flags Bitfield:
1615          *      EDIT_NEW
1616          *          Article is known or assumed to be non-existent, create a new one
1617          *      EDIT_UPDATE
1618          *          Article is known or assumed to be pre-existing, update it
1619          *      EDIT_MINOR
1620          *          Mark this edit minor, if the user is allowed to do so
1621          *      EDIT_SUPPRESS_RC
1622          *          Do not log the change in recentchanges
1623          *      EDIT_FORCE_BOT
1624          *          Mark the edit a "bot" edit regardless of user rights
1625          *      EDIT_DEFER_UPDATES
1626          *          Defer some of the updates until the end of index.php
1627          *      EDIT_AUTOSUMMARY
1628          *          Fill in blank summaries with generated text where possible
1629          *
1630          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1631          * article will be detected. If EDIT_UPDATE is specified and the article
1632          * doesn't exist, the function will return an edit-gone-missing error. If
1633          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1634          * error will be returned. These two conditions are also possible with
1635          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1636          *
1637          * @param bool|int $baseRevId The revision ID this edit was based off, if any
1638          * @param User $user The user doing the edit
1639          *
1640          * @throws MWException
1641          * @return Status Possible errors:
1642          *   edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1643          *     set the fatal flag of $status
1644          *   edit-gone-missing: In update mode, but the article didn't exist.
1645          *   edit-conflict: In update mode, the article changed unexpectedly.
1646          *   edit-no-change: Warning that the text was the same as before.
1647          *   edit-already-exists: In creation mode, but the article already exists.
1648          *
1649          * Extensions may define additional errors.
1650          *
1651          * $return->value will contain an associative array with members as follows:
1652          *     new: Boolean indicating if the function attempted to create a new article.
1653          *     revision: The revision object for the inserted revision, or null.
1654          *
1655          * Compatibility note: this function previously returned a boolean value
1656          * indicating success/failure
1657          *
1658          * @deprecated since 1.21: use doEditContent() instead.
1659          */
1660         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1661                 ContentHandler::deprecated( __METHOD__, '1.21' );
1662
1663                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1664
1665                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1666         }
1667
1668         /**
1669          * Change an existing article or create a new article. Updates RC and all necessary caches,
1670          * optionally via the deferred update array.
1671          *
1672          * @param Content $content New content
1673          * @param string $summary Edit summary
1674          * @param int $flags Bitfield:
1675          *      EDIT_NEW
1676          *          Article is known or assumed to be non-existent, create a new one
1677          *      EDIT_UPDATE
1678          *          Article is known or assumed to be pre-existing, update it
1679          *      EDIT_MINOR
1680          *          Mark this edit minor, if the user is allowed to do so
1681          *      EDIT_SUPPRESS_RC
1682          *          Do not log the change in recentchanges
1683          *      EDIT_FORCE_BOT
1684          *          Mark the edit a "bot" edit regardless of user rights
1685          *      EDIT_DEFER_UPDATES
1686          *          Defer some of the updates until the end of index.php
1687          *      EDIT_AUTOSUMMARY
1688          *          Fill in blank summaries with generated text where possible
1689          *
1690          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1691          * article will be detected. If EDIT_UPDATE is specified and the article
1692          * doesn't exist, the function will return an edit-gone-missing error. If
1693          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1694          * error will be returned. These two conditions are also possible with
1695          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1696          *
1697          * @param bool|int $baseRevId The revision ID this edit was based off, if any
1698          * @param User $user The user doing the edit
1699          * @param string $serialFormat Format for storing the content in the
1700          *   database.
1701          *
1702          * @throws MWException
1703          * @return Status Possible errors:
1704          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1705          *       set the fatal flag of $status.
1706          *     edit-gone-missing: In update mode, but the article didn't exist.
1707          *     edit-conflict: In update mode, the article changed unexpectedly.
1708          *     edit-no-change: Warning that the text was the same as before.
1709          *     edit-already-exists: In creation mode, but the article already exists.
1710          *
1711          *  Extensions may define additional errors.
1712          *
1713          *  $return->value will contain an associative array with members as follows:
1714          *     new: Boolean indicating if the function attempted to create a new article.
1715          *     revision: The revision object for the inserted revision, or null.
1716          *
1717          * @since 1.21
1718          */
1719         public function doEditContent( Content $content, $summary, $flags = 0, $baseRevId = false,
1720                 User $user = null, $serialFormat = null
1721         ) {
1722                 global $wgUser, $wgUseAutomaticEditSummaries, $wgUseRCPatrol, $wgUseNPPatrol;
1723
1724                 // Low-level sanity check
1725                 if ( $this->mTitle->getText() === '' ) {
1726                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1727                 }
1728
1729                 wfProfileIn( __METHOD__ );
1730
1731                 if ( !$content->getContentHandler()->canBeUsedOn( $this->getTitle() ) ) {
1732                         wfProfileOut( __METHOD__ );
1733                         return Status::newFatal( 'content-not-allowed-here',
1734                                 ContentHandler::getLocalizedName( $content->getModel() ),
1735                                 $this->getTitle()->getPrefixedText() );
1736                 }
1737
1738                 $user = is_null( $user ) ? $wgUser : $user;
1739                 $status = Status::newGood( array() );
1740
1741                 // Load the data from the master database if needed.
1742                 // The caller may already loaded it from the master or even loaded it using
1743                 // SELECT FOR UPDATE, so do not override that using clear().
1744                 $this->loadPageData( 'fromdbmaster' );
1745
1746                 $flags = $this->checkFlags( $flags );
1747
1748                 // handle hook
1749                 $hook_args = array( &$this, &$user, &$content, &$summary,
1750                                                         $flags & EDIT_MINOR, null, null, &$flags, &$status );
1751
1752                 if ( !Hooks::run( 'PageContentSave', $hook_args )
1753                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args ) ) {
1754
1755                         wfDebug( __METHOD__ . ": ArticleSave or ArticleSaveContent hook aborted save!\n" );
1756
1757                         if ( $status->isOK() ) {
1758                                 $status->fatal( 'edit-hook-aborted' );
1759                         }
1760
1761                         wfProfileOut( __METHOD__ );
1762                         return $status;
1763                 }
1764
1765                 // Silently ignore EDIT_MINOR if not allowed
1766                 $isminor = ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' );
1767                 $bot = $flags & EDIT_FORCE_BOT;
1768
1769                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1770
1771                 $oldsize = $old_content ? $old_content->getSize() : 0;
1772                 $oldid = $this->getLatest();
1773                 $oldIsRedirect = $this->isRedirect();
1774                 $oldcountable = $this->isCountable();
1775
1776                 $handler = $content->getContentHandler();
1777
1778                 // Provide autosummaries if one is not provided and autosummaries are enabled.
1779                 if ( $wgUseAutomaticEditSummaries && $flags & EDIT_AUTOSUMMARY && $summary == '' ) {
1780                         if ( !$old_content ) {
1781                                 $old_content = null;
1782                         }
1783                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1784                 }
1785
1786                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat );
1787                 $serialized = $editInfo->pst;
1788
1789                 /**
1790                  * @var Content $content
1791                  */
1792                 $content = $editInfo->pstContent;
1793                 $newsize = $content->getSize();
1794
1795                 $dbw = wfGetDB( DB_MASTER );
1796                 $now = wfTimestampNow();
1797                 $this->mTimestamp = $now;
1798
1799                 if ( $flags & EDIT_UPDATE ) {
1800                         // Update article, but only if changed.
1801                         $status->value['new'] = false;
1802
1803                         if ( !$oldid ) {
1804                                 // Article gone missing
1805                                 wfDebug( __METHOD__ . ": EDIT_UPDATE specified but article doesn't exist\n" );
1806                                 $status->fatal( 'edit-gone-missing' );
1807
1808                                 wfProfileOut( __METHOD__ );
1809                                 return $status;
1810                         } elseif ( !$old_content ) {
1811                                 // Sanity check for bug 37225
1812                                 wfProfileOut( __METHOD__ );
1813                                 throw new MWException( "Could not find text for current revision {$oldid}." );
1814                         }
1815
1816                         $revision = new Revision( array(
1817                                 'page'       => $this->getId(),
1818                                 'title'      => $this->getTitle(), // for determining the default content model
1819                                 'comment'    => $summary,
1820                                 'minor_edit' => $isminor,
1821                                 'text'       => $serialized,
1822                                 'len'        => $newsize,
1823                                 'parent_id'  => $oldid,
1824                                 'user'       => $user->getId(),
1825                                 'user_text'  => $user->getName(),
1826                                 'timestamp'  => $now,
1827                                 'content_model' => $content->getModel(),
1828                                 'content_format' => $serialFormat,
1829                         ) ); // XXX: pass content object?!
1830
1831                         $changed = !$content->equals( $old_content );
1832
1833                         if ( $changed ) {
1834                                 $dbw->begin( __METHOD__ );
1835                                 try {
1836
1837                                         $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1838                                         $status->merge( $prepStatus );
1839
1840                                         if ( !$status->isOK() ) {
1841                                                 $dbw->rollback( __METHOD__ );
1842
1843                                                 wfProfileOut( __METHOD__ );
1844                                                 return $status;
1845                                         }
1846                                         $revisionId = $revision->insertOn( $dbw );
1847
1848                                         // Update page
1849                                         //
1850                                         // We check for conflicts by comparing $oldid with the current latest revision ID.
1851                                         $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
1852
1853                                         if ( !$ok ) {
1854                                                 // Belated edit conflict! Run away!!
1855                                                 $status->fatal( 'edit-conflict' );
1856
1857                                                 $dbw->rollback( __METHOD__ );
1858
1859                                                 wfProfileOut( __METHOD__ );
1860                                                 return $status;
1861                                         }
1862
1863                                         Hooks::run( 'NewRevisionFromEditComplete', array( $this, $revision, $baseRevId, $user ) );
1864                                         // Update recentchanges
1865                                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1866                                                 // Mark as patrolled if the user can do so
1867                                                 $patrolled = $wgUseRCPatrol && !count(
1868                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1869                                                 // Add RC row to the DB
1870                                                 $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
1871                                                         $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1872                                                         $revisionId, $patrolled
1873                                                 );
1874
1875                                                 // Log auto-patrolled edits
1876                                                 if ( $patrolled ) {
1877                                                         PatrolLog::record( $rc, true, $user );
1878                                                 }
1879                                         }
1880                                         $user->incEditCount();
1881                                 } catch ( MWException $e ) {
1882                                         $dbw->rollback( __METHOD__ );
1883                                         // Question: Would it perhaps be better if this method turned all
1884                                         // exceptions into $status's?
1885                                         throw $e;
1886                                 }
1887                                 $dbw->commit( __METHOD__ );
1888                         } else {
1889                                 // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1890                                 // related variables correctly
1891                                 $revision->setId( $this->getLatest() );
1892                         }
1893
1894                         // Update links tables, site stats, etc.
1895                         $this->doEditUpdates(
1896                                 $revision,
1897                                 $user,
1898                                 array(
1899                                         'changed' => $changed,
1900                                         'oldcountable' => $oldcountable
1901                                 )
1902                         );
1903
1904                         if ( !$changed ) {
1905                                 $status->warning( 'edit-no-change' );
1906                                 $revision = null;
1907                                 // Update page_touched, this is usually implicit in the page update
1908                                 // Other cache updates are done in onArticleEdit()
1909                                 $this->mTitle->invalidateCache();
1910                         }
1911                 } else {
1912                         // Create new article
1913                         $status->value['new'] = true;
1914
1915                         $dbw->begin( __METHOD__ );
1916                         try {
1917
1918                                 $prepStatus = $content->prepareSave( $this, $flags, $baseRevId, $user );
1919                                 $status->merge( $prepStatus );
1920
1921                                 if ( !$status->isOK() ) {
1922                                         $dbw->rollback( __METHOD__ );
1923
1924                                         wfProfileOut( __METHOD__ );
1925                                         return $status;
1926                                 }
1927
1928                                 $status->merge( $prepStatus );
1929
1930                                 // Add the page record; stake our claim on this title!
1931                                 // This will return false if the article already exists
1932                                 $newid = $this->insertOn( $dbw );
1933
1934                                 if ( $newid === false ) {
1935                                         $dbw->rollback( __METHOD__ );
1936                                         $status->fatal( 'edit-already-exists' );
1937
1938                                         wfProfileOut( __METHOD__ );
1939                                         return $status;
1940                                 }
1941
1942                                 // Save the revision text...
1943                                 $revision = new Revision( array(
1944                                         'page'       => $newid,
1945                                         'title'      => $this->getTitle(), // for determining the default content model
1946                                         'comment'    => $summary,
1947                                         'minor_edit' => $isminor,
1948                                         'text'       => $serialized,
1949                                         'len'        => $newsize,
1950                                         'user'       => $user->getId(),
1951                                         'user_text'  => $user->getName(),
1952                                         'timestamp'  => $now,
1953                                         'content_model' => $content->getModel(),
1954                                         'content_format' => $serialFormat,
1955                                 ) );
1956                                 $revisionId = $revision->insertOn( $dbw );
1957
1958                                 // Bug 37225: use accessor to get the text as Revision may trim it
1959                                 $content = $revision->getContent(); // sanity; get normalized version
1960
1961                                 if ( $content ) {
1962                                         $newsize = $content->getSize();
1963                                 }
1964
1965                                 // Update the page record with revision data
1966                                 $this->updateRevisionOn( $dbw, $revision, 0 );
1967
1968                                 Hooks::run( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
1969
1970                                 // Update recentchanges
1971                                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1972                                         // Mark as patrolled if the user can do so
1973                                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) && !count(
1974                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1975                                         // Add RC row to the DB
1976                                         $rc = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $user, $summary, $bot,
1977                                                 '', $newsize, $revisionId, $patrolled );
1978
1979                                         // Log auto-patrolled edits
1980                                         if ( $patrolled ) {
1981                                                 PatrolLog::record( $rc, true, $user );
1982                                         }
1983                                 }
1984                                 $user->incEditCount();
1985
1986                         } catch ( MWException $e ) {
1987                                 $dbw->rollback( __METHOD__ );
1988                                 throw $e;
1989                         }
1990                         $dbw->commit( __METHOD__ );
1991
1992                         // Update links, etc.
1993                         $this->doEditUpdates( $revision, $user, array( 'created' => true ) );
1994
1995                         $hook_args = array( &$this, &$user, $content, $summary,
1996                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision );
1997
1998                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $hook_args );
1999                         Hooks::run( 'PageContentInsertComplete', $hook_args );
2000                 }
2001
2002                 // Do updates right now unless deferral was requested
2003                 if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
2004                         DeferredUpdates::doUpdates();
2005                 }
2006
2007                 // Return the new revision (or null) to the caller
2008                 $status->value['revision'] = $revision;
2009
2010                 $hook_args = array( &$this, &$user, $content, $summary,
2011                                                         $flags & EDIT_MINOR, null, null, &$flags, $revision, &$status, $baseRevId );
2012
2013                 ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $hook_args );
2014                 Hooks::run( 'PageContentSaveComplete', $hook_args );
2015
2016                 // Promote user to any groups they meet the criteria for
2017                 $dbw->onTransactionIdle( function () use ( $user ) {
2018                         $user->addAutopromoteOnceGroups( 'onEdit' );
2019                 } );
2020
2021                 wfProfileOut( __METHOD__ );
2022                 return $status;
2023         }
2024
2025         /**
2026          * Get parser options suitable for rendering the primary article wikitext
2027          *
2028          * @see ContentHandler::makeParserOptions
2029          *
2030          * @param IContextSource|User|string $context One of the following:
2031          *        - IContextSource: Use the User and the Language of the provided
2032          *          context
2033          *        - User: Use the provided User object and $wgLang for the language,
2034          *          so use an IContextSource object if possible.
2035          *        - 'canonical': Canonical options (anonymous user with default
2036          *          preferences and content language).
2037          * @return ParserOptions
2038          */
2039         public function makeParserOptions( $context ) {
2040                 $options = $this->getContentHandler()->makeParserOptions( $context );
2041
2042                 if ( $this->getTitle()->isConversionTable() ) {
2043                         // @todo ConversionTable should become a separate content model, so
2044                         // we don't need special cases like this one.
2045                         $options->disableContentConversion();
2046                 }
2047
2048                 return $options;
2049         }
2050
2051         /**
2052          * Prepare text which is about to be saved.
2053          * Returns a stdClass with source, pst and output members
2054          *
2055          * @deprecated since 1.21: use prepareContentForEdit instead.
2056          * @return object
2057          */
2058         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2059                 ContentHandler::deprecated( __METHOD__, '1.21' );
2060                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2061                 return $this->prepareContentForEdit( $content, $revid, $user );
2062         }
2063
2064         /**
2065          * Prepare content which is about to be saved.
2066          * Returns a stdClass with source, pst and output members
2067          *
2068          * @param Content $content
2069          * @param int|null $revid
2070          * @param User|null $user
2071          * @param string|null $serialFormat
2072          * @param bool $useCache Check shared prepared edit cache
2073          *
2074          * @return object
2075          *
2076          * @since 1.21
2077          */
2078         public function prepareContentForEdit(
2079                 Content $content, $revid = null, User $user = null, $serialFormat = null, $useCache = true
2080         ) {
2081                 global $wgContLang, $wgUser;
2082
2083                 $user = is_null( $user ) ? $wgUser : $user;
2084                 //XXX: check $user->getId() here???
2085
2086                 // Use a sane default for $serialFormat, see bug 57026
2087                 if ( $serialFormat === null ) {
2088                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2089                 }
2090
2091                 if ( $this->mPreparedEdit
2092                         && $this->mPreparedEdit->newContent
2093                         && $this->mPreparedEdit->newContent->equals( $content )
2094                         && $this->mPreparedEdit->revid == $revid
2095                         && $this->mPreparedEdit->format == $serialFormat
2096                         // XXX: also check $user here?
2097                 ) {
2098                         // Already prepared
2099                         return $this->mPreparedEdit;
2100                 }
2101
2102                 // The edit may have already been prepared via api.php?action=stashedit
2103                 $cachedEdit = $useCache
2104                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2105                         : false;
2106
2107                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2108                 Hooks::run( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
2109
2110                 $edit = (object)array();
2111                 if ( $cachedEdit ) {
2112                         $edit->timestamp = $cachedEdit->timestamp;
2113                 } else {
2114                         $edit->timestamp = wfTimestampNow();
2115                 }
2116                 // @note: $cachedEdit is not used if the rev ID was referenced in the text
2117                 $edit->revid = $revid;
2118
2119                 if ( $cachedEdit ) {
2120                         $edit->pstContent = $cachedEdit->pstContent;
2121                 } else {
2122                         $edit->pstContent = $content
2123                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2124                                 : null;
2125                 }
2126
2127                 $edit->format = $serialFormat;
2128                 $edit->popts = $this->makeParserOptions( 'canonical' );
2129                 if ( $cachedEdit ) {
2130                         $edit->output = $cachedEdit->output;
2131                 } else {
2132                         $edit->output = $edit->pstContent
2133                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2134                                 : null;
2135                 }
2136
2137                 $edit->newContent = $content;
2138                 $edit->oldContent = $this->getContent( Revision::RAW );
2139
2140                 // NOTE: B/C for hooks! don't use these fields!
2141                 $edit->newText = $edit->newContent ? ContentHandler::getContentText( $edit->newContent ) : '';
2142                 $edit->oldText = $edit->oldContent ? ContentHandler::getContentText( $edit->oldContent ) : '';
2143                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2144
2145                 $this->mPreparedEdit = $edit;
2146                 return $edit;
2147         }
2148
2149         /**
2150          * Do standard deferred updates after page edit.
2151          * Update links tables, site stats, search index and message cache.
2152          * Purges pages that include this page if the text was changed here.
2153          * Every 100th edit, prune the recent changes table.
2154          *
2155          * @param Revision $revision
2156          * @param User $user User object that did the revision
2157          * @param array $options Array of options, following indexes are used:
2158          * - changed: boolean, whether the revision changed the content (default true)
2159          * - created: boolean, whether the revision created the page (default false)
2160          * - moved: boolean, whether the page was moved (default false)
2161          * - oldcountable: boolean or null (default null):
2162          *   - boolean: whether the page was counted as an article before that
2163          *     revision, only used in changed is true and created is false
2164          *   - null: don't change the article count
2165          */
2166         public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
2167                 global $wgEnableParserCache;
2168
2169                 wfProfileIn( __METHOD__ );
2170
2171                 $options += array(
2172                         'changed' => true,
2173                         'created' => false,
2174                         'moved' => false,
2175                         'oldcountable' => null
2176                 );
2177                 $content = $revision->getContent();
2178
2179                 // Parse the text
2180                 // Be careful not to do pre-save transform twice: $text is usually
2181                 // already pre-save transformed once.
2182                 if ( !$this->mPreparedEdit || $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2183                         wfDebug( __METHOD__ . ": No prepared edit or vary-revision is set...\n" );
2184                         $editInfo = $this->prepareContentForEdit( $content, $revision->getId(), $user );
2185                 } else {
2186                         wfDebug( __METHOD__ . ": No vary-revision, using prepared edit...\n" );
2187                         $editInfo = $this->mPreparedEdit;
2188                 }
2189
2190                 // Save it to the parser cache
2191                 if ( $wgEnableParserCache ) {
2192                         $parserCache = ParserCache::singleton();
2193                         $parserCache->save(
2194                                 $editInfo->output, $this, $editInfo->popts, $editInfo->timestamp, $editInfo->revid
2195                         );
2196                 }
2197
2198                 // Update the links tables and other secondary data
2199                 if ( $content ) {
2200                         $recursive = $options['changed']; // bug 50785
2201                         $updates = $content->getSecondaryDataUpdates(
2202                                 $this->getTitle(), null, $recursive, $editInfo->output );
2203                         DataUpdate::runUpdates( $updates );
2204                 }
2205
2206                 Hooks::run( 'ArticleEditUpdates', array( &$this, &$editInfo, $options['changed'] ) );
2207
2208                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2209                         if ( 0 == mt_rand( 0, 99 ) ) {
2210                                 // Flush old entries from the `recentchanges` table; we do this on
2211                                 // random requests so as to avoid an increase in writes for no good reason
2212                                 RecentChange::purgeExpiredChanges();
2213                         }
2214                 }
2215
2216                 if ( !$this->exists() ) {
2217                         wfProfileOut( __METHOD__ );
2218                         return;
2219                 }
2220
2221                 $id = $this->getId();
2222                 $title = $this->mTitle->getPrefixedDBkey();
2223                 $shortTitle = $this->mTitle->getDBkey();
2224
2225                 if ( !$options['changed'] && !$options['moved'] ) {
2226                         $good = 0;
2227                 } elseif ( $options['created'] ) {
2228                         $good = (int)$this->isCountable( $editInfo );
2229                 } elseif ( $options['oldcountable'] !== null ) {
2230                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2231                 } else {
2232                         $good = 0;
2233                 }
2234                 $edits = $options['changed'] ? 1 : 0;
2235                 $total = $options['created'] ? 1 : 0;
2236
2237                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2238                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2239
2240                 // If this is another user's talk page, update newtalk.
2241                 // Don't do this if $options['changed'] = false (null-edits) nor if
2242                 // it's a minor edit and the user doesn't want notifications for those.
2243                 if ( $options['changed']
2244                         && $this->mTitle->getNamespace() == NS_USER_TALK
2245                         && $shortTitle != $user->getTitleKey()
2246                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2247                 ) {
2248                         $recipient = User::newFromName( $shortTitle, false );
2249                         if ( !$recipient ) {
2250                                 wfDebug( __METHOD__ . ": invalid username\n" );
2251                         } else {
2252                                 // Allow extensions to prevent user notification when a new message is added to their talk page
2253                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', array( &$this, $recipient ) ) ) {
2254                                         if ( User::isIP( $shortTitle ) ) {
2255                                                 // An anonymous user
2256                                                 $recipient->setNewtalk( true, $revision );
2257                                         } elseif ( $recipient->isLoggedIn() ) {
2258                                                 $recipient->setNewtalk( true, $revision );
2259                                         } else {
2260                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2261                                         }
2262                                 }
2263                         }
2264                 }
2265
2266                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2267                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2268                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2269                         if ( $msgtext === false || $msgtext === null ) {
2270                                 $msgtext = '';
2271                         }
2272
2273                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2274                 }
2275
2276                 if ( $options['created'] ) {
2277                         self::onArticleCreate( $this->mTitle );
2278                 } elseif ( $options['changed'] ) { // bug 50785
2279                         self::onArticleEdit( $this->mTitle );
2280                 }
2281
2282                 wfProfileOut( __METHOD__ );
2283         }
2284
2285         /**
2286          * Edit an article without doing all that other stuff
2287          * The article must already exist; link tables etc
2288          * are not updated, caches are not flushed.
2289          *
2290          * @param string $text Text submitted
2291          * @param User $user The relevant user
2292          * @param string $comment Comment submitted
2293          * @param bool $minor Whereas it's a minor modification
2294          *
2295          * @deprecated since 1.21, use doEditContent() instead.
2296          */
2297         public function doQuickEdit( $text, User $user, $comment = '', $minor = 0 ) {
2298                 ContentHandler::deprecated( __METHOD__, "1.21" );
2299
2300                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2301                 $this->doQuickEditContent( $content, $user, $comment, $minor );
2302         }
2303
2304         /**
2305          * Edit an article without doing all that other stuff
2306          * The article must already exist; link tables etc
2307          * are not updated, caches are not flushed.
2308          *
2309          * @param Content $content Content submitted
2310          * @param User $user The relevant user
2311          * @param string $comment Comment submitted
2312          * @param bool $minor Whereas it's a minor modification
2313          * @param string $serialFormat Format for storing the content in the database
2314          */
2315         public function doQuickEditContent( Content $content, User $user, $comment = '', $minor = false,
2316                 $serialFormat = null
2317         ) {
2318                 wfProfileIn( __METHOD__ );
2319
2320                 $serialized = $content->serialize( $serialFormat );
2321
2322                 $dbw = wfGetDB( DB_MASTER );
2323                 $revision = new Revision( array(
2324                         'title'      => $this->getTitle(), // for determining the default content model
2325                         'page'       => $this->getId(),
2326                         'user_text'  => $user->getName(),
2327                         'user'       => $user->getId(),
2328                         'text'       => $serialized,
2329                         'length'     => $content->getSize(),
2330                         'comment'    => $comment,
2331                         'minor_edit' => $minor ? 1 : 0,
2332                 ) ); // XXX: set the content object?
2333                 $revision->insertOn( $dbw );
2334                 $this->updateRevisionOn( $dbw, $revision );
2335
2336                 Hooks::run( 'NewRevisionFromEditComplete', array( $this, $revision, false, $user ) );
2337
2338                 wfProfileOut( __METHOD__ );
2339         }
2340
2341         /**
2342          * Update the article's restriction field, and leave a log entry.
2343          * This works for protection both existing and non-existing pages.
2344          *
2345          * @param array $limit Set of restriction keys
2346          * @param array $expiry Per restriction type expiration
2347          * @param int &$cascade Set to false if cascading protection isn't allowed.
2348          * @param string $reason
2349          * @param User $user The user updating the restrictions
2350          * @return Status
2351          */
2352         public function doUpdateRestrictions( array $limit, array $expiry,
2353                 &$cascade, $reason, User $user
2354         ) {
2355                 global $wgCascadingRestrictionLevels, $wgContLang;
2356
2357                 if ( wfReadOnly() ) {
2358                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2359                 }
2360
2361                 $this->loadPageData( 'fromdbmaster' );
2362                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2363                 $id = $this->getId();
2364
2365                 if ( !$cascade ) {
2366                         $cascade = false;
2367                 }
2368
2369                 // Take this opportunity to purge out expired restrictions
2370                 Title::purgeExpiredRestrictions();
2371
2372                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2373                 // we expect a single selection, but the schema allows otherwise.
2374                 $isProtected = false;
2375                 $protect = false;
2376                 $changed = false;
2377
2378                 $dbw = wfGetDB( DB_MASTER );
2379
2380                 foreach ( $restrictionTypes as $action ) {
2381                         if ( !isset( $expiry[$action] ) ) {
2382                                 $expiry[$action] = $dbw->getInfinity();
2383                         }
2384                         if ( !isset( $limit[$action] ) ) {
2385                                 $limit[$action] = '';
2386                         } elseif ( $limit[$action] != '' ) {
2387                                 $protect = true;
2388                         }
2389
2390                         // Get current restrictions on $action
2391                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2392                         if ( $current != '' ) {
2393                                 $isProtected = true;
2394                         }
2395
2396                         if ( $limit[$action] != $current ) {
2397                                 $changed = true;
2398                         } elseif ( $limit[$action] != '' ) {
2399                                 // Only check expiry change if the action is actually being
2400                                 // protected, since expiry does nothing on an not-protected
2401                                 // action.
2402                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2403                                         $changed = true;
2404                                 }
2405                         }
2406                 }
2407
2408                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2409                         $changed = true;
2410                 }
2411
2412                 // If nothing has changed, do nothing
2413                 if ( !$changed ) {
2414                         return Status::newGood();
2415                 }
2416
2417                 if ( !$protect ) { // No protection at all means unprotection
2418                         $revCommentMsg = 'unprotectedarticle';
2419                         $logAction = 'unprotect';
2420                 } elseif ( $isProtected ) {
2421                         $revCommentMsg = 'modifiedarticleprotection';
2422                         $logAction = 'modify';
2423                 } else {
2424                         $revCommentMsg = 'protectedarticle';
2425                         $logAction = 'protect';
2426                 }
2427
2428                 // Truncate for whole multibyte characters
2429                 $reason = $wgContLang->truncate( $reason, 255 );
2430
2431                 $logRelationsValues = array();
2432                 $logRelationsField = null;
2433
2434                 if ( $id ) { // Protection of existing page
2435                         if ( !Hooks::run( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
2436                                 return Status::newGood();
2437                         }
2438
2439                         // Only certain restrictions can cascade...
2440                         $editrestriction = isset( $limit['edit'] )
2441                                 ? array( $limit['edit'] )
2442                                 : $this->mTitle->getRestrictions( 'edit' );
2443                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2444                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2445                         }
2446                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2447                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2448                         }
2449
2450                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2451                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2452                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2453                         }
2454                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2455                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2456                         }
2457
2458                         // The schema allows multiple restrictions
2459                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2460                                 $cascade = false;
2461                         }
2462
2463                         // insert null revision to identify the page protection change as edit summary
2464                         $latest = $this->getLatest();
2465                         $nullRevision = $this->insertProtectNullRevision(
2466                                 $revCommentMsg,
2467                                 $limit,
2468                                 $expiry,
2469                                 $cascade,
2470                                 $reason,
2471                                 $user
2472                         );
2473
2474                         if ( $nullRevision === null ) {
2475                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2476                         }
2477
2478                         $logRelationsField = 'pr_id';
2479
2480                         // Update restrictions table
2481                         foreach ( $limit as $action => $restrictions ) {
2482                                 $dbw->delete(
2483                                         'page_restrictions',
2484                                         array(
2485                                                 'pr_page' => $id,
2486                                                 'pr_type' => $action
2487                                         ),
2488                                         __METHOD__
2489                                 );
2490                                 if ( $restrictions != '' ) {
2491                                         $dbw->insert(
2492                                                 'page_restrictions',
2493                                                 array(
2494                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2495                                                         'pr_page' => $id,
2496                                                         'pr_type' => $action,
2497                                                         'pr_level' => $restrictions,
2498                                                         'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
2499                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2500                                                 ),
2501                                                 __METHOD__
2502                                         );
2503                                         $logRelationsValues[] = $dbw->insertId();
2504                                 }
2505                         }
2506
2507                         // Clear out legacy restriction fields
2508                         $dbw->update(
2509                                 'page',
2510                                 array( 'page_restrictions' => '' ),
2511                                 array( 'page_id' => $id ),
2512                                 __METHOD__
2513                         );
2514
2515                         Hooks::run( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
2516                         Hooks::run( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
2517                 } else { // Protection of non-existing page (also known as "title protection")
2518                         // Cascade protection is meaningless in this case
2519                         $cascade = false;
2520
2521                         if ( $limit['create'] != '' ) {
2522                                 $dbw->replace( 'protected_titles',
2523                                         array( array( 'pt_namespace', 'pt_title' ) ),
2524                                         array(
2525                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2526                                                 'pt_title' => $this->mTitle->getDBkey(),
2527                                                 'pt_create_perm' => $limit['create'],
2528                                                 'pt_timestamp' => $dbw->timestamp(),
2529                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2530                                                 'pt_user' => $user->getId(),
2531                                                 'pt_reason' => $reason,
2532                                         ), __METHOD__
2533                                 );
2534                         } else {
2535                                 $dbw->delete( 'protected_titles',
2536                                         array(
2537                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2538                                                 'pt_title' => $this->mTitle->getDBkey()
2539                                         ), __METHOD__
2540                                 );
2541                         }
2542                 }
2543
2544                 $this->mTitle->flushRestrictions();
2545                 InfoAction::invalidateCache( $this->mTitle );
2546
2547                 if ( $logAction == 'unprotect' ) {
2548                         $params = array();
2549                 } else {
2550                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2551                         $params = array( $protectDescriptionLog, $cascade ? 'cascade' : '' );
2552                 }
2553
2554                 // Update the protection log
2555                 $log = new LogPage( 'protect' );
2556                 $logId = $log->addEntry( $logAction, $this->mTitle, $reason, $params, $user );
2557                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2558                         $log->addRelations( $logRelationsField, $logRelationsValues, $logId );
2559                 }
2560
2561                 return Status::newGood();
2562         }
2563
2564         /**
2565          * Insert a new null revision for this page.
2566          *
2567          * @param string $revCommentMsg Comment message key for the revision
2568          * @param array $limit Set of restriction keys
2569          * @param array $expiry Per restriction type expiration
2570          * @param int $cascade Set to false if cascading protection isn't allowed.
2571          * @param string $reason
2572          * @param User|null $user
2573          * @return Revision|null Null on error
2574          */
2575         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2576                 array $expiry, $cascade, $reason, $user = null
2577         ) {
2578                 global $wgContLang;
2579                 $dbw = wfGetDB( DB_MASTER );
2580
2581                 // Prepare a null revision to be added to the history
2582                 $editComment = $wgContLang->ucfirst(
2583                         wfMessage(
2584                                 $revCommentMsg,
2585                                 $this->mTitle->getPrefixedText()
2586                         )->inContentLanguage()->text()
2587                 );
2588                 if ( $reason ) {
2589                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2590                 }
2591                 $protectDescription = $this->protectDescription( $limit, $expiry );
2592                 if ( $protectDescription ) {
2593                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2594                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2595                                 ->inContentLanguage()->text();
2596                 }
2597                 if ( $cascade ) {
2598                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2599                         $editComment .= wfMessage( 'brackets' )->params(
2600                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2601                         )->inContentLanguage()->text();
2602                 }
2603
2604                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2605                 if ( $nullRev ) {
2606                         $nullRev->insertOn( $dbw );
2607
2608                         // Update page record and touch page
2609                         $oldLatest = $nullRev->getParentId();
2610                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2611                 }
2612
2613                 return $nullRev;
2614         }
2615
2616         /**
2617          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2618          * @return string
2619          */
2620         protected function formatExpiry( $expiry ) {
2621                 global $wgContLang;
2622                 $dbr = wfGetDB( DB_SLAVE );
2623
2624                 $encodedExpiry = $dbr->encodeExpiry( $expiry );
2625                 if ( $encodedExpiry != 'infinity' ) {
2626                         return wfMessage(
2627                                 'protect-expiring',
2628                                 $wgContLang->timeanddate( $expiry, false, false ),
2629                                 $wgContLang->date( $expiry, false, false ),
2630                                 $wgContLang->time( $expiry, false, false )
2631                         )->inContentLanguage()->text();
2632                 } else {
2633                         return wfMessage( 'protect-expiry-indefinite' )
2634                                 ->inContentLanguage()->text();
2635                 }
2636         }
2637
2638         /**
2639          * Builds the description to serve as comment for the edit.
2640          *
2641          * @param array $limit Set of restriction keys
2642          * @param array $expiry Per restriction type expiration
2643          * @return string
2644          */
2645         public function protectDescription( array $limit, array $expiry ) {
2646                 $protectDescription = '';
2647
2648                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2649                         # $action is one of $wgRestrictionTypes = array( 'create', 'edit', 'move', 'upload' ).
2650                         # All possible message keys are listed here for easier grepping:
2651                         # * restriction-create
2652                         # * restriction-edit
2653                         # * restriction-move
2654                         # * restriction-upload
2655                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2656                         # $restrictions is one of $wgRestrictionLevels = array( '', 'autoconfirmed', 'sysop' ),
2657                         # with '' filtered out. All possible message keys are listed below:
2658                         # * protect-level-autoconfirmed
2659                         # * protect-level-sysop
2660                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )->inContentLanguage()->text();
2661
2662                         $expiryText = $this->formatExpiry( $expiry[$action] );
2663
2664                         if ( $protectDescription !== '' ) {
2665                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2666                         }
2667                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2668                                 ->params( $actionText, $restrictionsText, $expiryText )
2669                                 ->inContentLanguage()->text();
2670                 }
2671
2672                 return $protectDescription;
2673         }
2674
2675         /**
2676          * Builds the description to serve as comment for the log entry.
2677          *
2678          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2679          * protect description text. Keep them in old format to avoid breaking compatibility.
2680          * TODO: Fix protection log to store structured description and format it on-the-fly.
2681          *
2682          * @param array $limit Set of restriction keys
2683          * @param array $expiry Per restriction type expiration
2684          * @return string
2685          */
2686         public function protectDescriptionLog( array $limit, array $expiry ) {
2687                 global $wgContLang;
2688
2689                 $protectDescriptionLog = '';
2690
2691                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2692                         $expiryText = $this->formatExpiry( $expiry[$action] );
2693                         $protectDescriptionLog .= $wgContLang->getDirMark() . "[$action=$restrictions] ($expiryText)";
2694                 }
2695
2696                 return trim( $protectDescriptionLog );
2697         }
2698
2699         /**
2700          * Take an array of page restrictions and flatten it to a string
2701          * suitable for insertion into the page_restrictions field.
2702          *
2703          * @param string[] $limit
2704          *
2705          * @throws MWException
2706          * @return string
2707          */
2708         protected static function flattenRestrictions( $limit ) {
2709                 if ( !is_array( $limit ) ) {
2710                         throw new MWException( 'WikiPage::flattenRestrictions given non-array restriction set' );
2711                 }
2712
2713                 $bits = array();
2714                 ksort( $limit );
2715
2716                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2717                         $bits[] = "$action=$restrictions";
2718                 }
2719
2720                 return implode( ':', $bits );
2721         }
2722
2723         /**
2724          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2725          * backwards compatibility, if you care about error reporting you should use
2726          * doDeleteArticleReal() instead.
2727          *
2728          * Deletes the article with database consistency, writes logs, purges caches
2729          *
2730          * @param string $reason Delete reason for deletion log
2731          * @param bool $suppress Suppress all revisions and log the deletion in
2732          *        the suppression log instead of the deletion log
2733          * @param int $id Article ID
2734          * @param bool $commit Defaults to true, triggers transaction end
2735          * @param array &$error Array of errors to append to
2736          * @param User $user The deleting user
2737          * @return bool True if successful
2738          */
2739         public function doDeleteArticle(
2740                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2741         ) {
2742                 $status = $this->doDeleteArticleReal( $reason, $suppress, $id, $commit, $error, $user );
2743                 return $status->isGood();
2744         }
2745
2746         /**
2747          * Back-end article deletion
2748          * Deletes the article with database consistency, writes logs, purges caches
2749          *
2750          * @since 1.19
2751          *
2752          * @param string $reason Delete reason for deletion log
2753          * @param bool $suppress Suppress all revisions and log the deletion in
2754          *   the suppression log instead of the deletion log
2755          * @param int $id Article ID
2756          * @param bool $commit Defaults to true, triggers transaction end
2757          * @param array &$error Array of errors to append to
2758          * @param User $user The deleting user
2759          * @return Status Status object; if successful, $status->value is the log_id of the
2760          *   deletion log entry. If the page couldn't be deleted because it wasn't
2761          *   found, $status is a non-fatal 'cannotdelete' error
2762          */
2763         public function doDeleteArticleReal(
2764                 $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
2765         ) {
2766                 global $wgUser, $wgContentHandlerUseDB;
2767
2768                 wfDebug( __METHOD__ . "\n" );
2769
2770                 $status = Status::newGood();
2771
2772                 if ( $this->mTitle->getDBkey() === '' ) {
2773                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2774                         return $status;
2775                 }
2776
2777                 $user = is_null( $user ) ? $wgUser : $user;
2778                 if ( !Hooks::run( 'ArticleDelete', array( &$this, &$user, &$reason, &$error, &$status ) ) ) {
2779                         if ( $status->isOK() ) {
2780                                 // Hook aborted but didn't set a fatal status
2781                                 $status->fatal( 'delete-hook-aborted' );
2782                         }
2783                         return $status;
2784                 }
2785
2786                 $dbw = wfGetDB( DB_MASTER );
2787                 $dbw->begin( __METHOD__ );
2788
2789                 if ( $id == 0 ) {
2790                         $this->loadPageData( 'forupdate' );
2791                         $id = $this->getID();
2792                         if ( $id == 0 ) {
2793                                 $dbw->rollback( __METHOD__ );
2794                                 $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2795                                 return $status;
2796                         }
2797                 }
2798
2799                 // we need to remember the old content so we can use it to generate all deletion updates.
2800                 $content = $this->getContent( Revision::RAW );
2801
2802                 // Bitfields to further suppress the content
2803                 if ( $suppress ) {
2804                         $bitfield = 0;
2805                         // This should be 15...
2806                         $bitfield |= Revision::DELETED_TEXT;
2807                         $bitfield |= Revision::DELETED_COMMENT;
2808                         $bitfield |= Revision::DELETED_USER;
2809                         $bitfield |= Revision::DELETED_RESTRICTED;
2810                 } else {
2811                         $bitfield = 'rev_deleted';
2812                 }
2813
2814                 // For now, shunt the revision data into the archive table.
2815                 // Text is *not* removed from the text table; bulk storage
2816                 // is left intact to avoid breaking block-compression or
2817                 // immutable storage schemes.
2818                 //
2819                 // For backwards compatibility, note that some older archive
2820                 // table entries will have ar_text and ar_flags fields still.
2821                 //
2822                 // In the future, we may keep revisions and mark them with
2823                 // the rev_deleted field, which is reserved for this purpose.
2824
2825                 $row = array(
2826                         'ar_namespace'  => 'page_namespace',
2827                         'ar_title'      => 'page_title',
2828                         'ar_comment'    => 'rev_comment',
2829                         'ar_user'       => 'rev_user',
2830                         'ar_user_text'  => 'rev_user_text',
2831                         'ar_timestamp'  => 'rev_timestamp',
2832                         'ar_minor_edit' => 'rev_minor_edit',
2833                         'ar_rev_id'     => 'rev_id',
2834                         'ar_parent_id'  => 'rev_parent_id',
2835                         'ar_text_id'    => 'rev_text_id',
2836                         'ar_text'       => '\'\'', // Be explicit to appease
2837                         'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2838                         'ar_len'        => 'rev_len',
2839                         'ar_page_id'    => 'page_id',
2840                         'ar_deleted'    => $bitfield,
2841                         'ar_sha1'       => 'rev_sha1',
2842                 );
2843
2844                 if ( $wgContentHandlerUseDB ) {
2845                         $row['ar_content_model'] = 'rev_content_model';
2846                         $row['ar_content_format'] = 'rev_content_format';
2847                 }
2848
2849                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2850                         $row,
2851                         array(
2852                                 'page_id' => $id,
2853                                 'page_id = rev_page'
2854                         ), __METHOD__
2855                 );
2856
2857                 // Now that it's safely backed up, delete it
2858                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__ );
2859                 $ok = ( $dbw->affectedRows() > 0 ); // $id could be laggy
2860
2861                 if ( !$ok ) {
2862                         $dbw->rollback( __METHOD__ );
2863                         $status->error( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2864                         return $status;
2865                 }
2866
2867                 if ( !$dbw->cascadingDeletes() ) {
2868                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2869                 }
2870
2871                 // Clone the title, so we have the information we need when we log
2872                 $logTitle = clone $this->mTitle;
2873
2874                 // Log the deletion, if the page was suppressed, log it at Oversight instead
2875                 $logtype = $suppress ? 'suppress' : 'delete';
2876
2877                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
2878                 $logEntry->setPerformer( $user );
2879                 $logEntry->setTarget( $logTitle );
2880                 $logEntry->setComment( $reason );
2881                 $logid = $logEntry->insert();
2882
2883                 $dbw->onTransactionPreCommitOrIdle( function () use ( $dbw, $logEntry, $logid ) {
2884                         // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
2885                         $logEntry->publish( $logid );
2886                 } );
2887
2888                 if ( $commit ) {
2889                         $dbw->commit( __METHOD__ );
2890                 }
2891
2892                 $this->doDeleteUpdates( $id, $content );
2893
2894                 Hooks::run( 'ArticleDeleteComplete', array( &$this, &$user, $reason, $id, $content, $logEntry ) );
2895                 $status->value = $logid;
2896                 return $status;
2897         }
2898
2899         /**
2900          * Do some database updates after deletion
2901          *
2902          * @param int $id The page_id value of the page being deleted
2903          * @param Content $content Optional page content to be used when determining
2904          *   the required updates. This may be needed because $this->getContent()
2905          *   may already return null when the page proper was deleted.
2906          */
2907         public function doDeleteUpdates( $id, Content $content = null ) {
2908                 // update site status
2909                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 ) );
2910
2911                 // remove secondary indexes, etc
2912                 $updates = $this->getDeletionUpdates( $content );
2913                 DataUpdate::runUpdates( $updates );
2914
2915                 // Reparse any pages transcluding this page
2916                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
2917
2918                 // Reparse any pages including this image
2919                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
2920                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
2921                 }
2922
2923                 // Clear caches
2924                 WikiPage::onArticleDelete( $this->mTitle );
2925
2926                 // Reset this object and the Title object
2927                 $this->loadFromRow( false, self::READ_LATEST );
2928
2929                 // Search engine
2930                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
2931         }
2932
2933         /**
2934          * Roll back the most recent consecutive set of edits to a page
2935          * from the same user; fails if there are no eligible edits to
2936          * roll back to, e.g. user is the sole contributor. This function
2937          * performs permissions checks on $user, then calls commitRollback()
2938          * to do the dirty work
2939          *
2940          * @todo Separate the business/permission stuff out from backend code
2941          *
2942          * @param string $fromP Name of the user whose edits to rollback.
2943          * @param string $summary Custom summary. Set to default summary if empty.
2944          * @param string $token Rollback token.
2945          * @param bool $bot If true, mark all reverted edits as bot.
2946          *
2947          * @param array $resultDetails Array contains result-specific array of additional values
2948          *    'alreadyrolled' : 'current' (rev)
2949          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
2950          *
2951          * @param User $user The user performing the rollback
2952          * @return array Array of errors, each error formatted as
2953          *   array(messagekey, param1, param2, ...).
2954          * On success, the array is empty.  This array can also be passed to
2955          * OutputPage::showPermissionsErrorPage().
2956          */
2957         public function doRollback(
2958                 $fromP, $summary, $token, $bot, &$resultDetails, User $user
2959         ) {
2960                 $resultDetails = null;
2961
2962                 // Check permissions
2963                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
2964                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
2965                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
2966
2967                 if ( !$user->matchEditToken( $token, array( $this->mTitle->getPrefixedText(), $fromP ) ) ) {
2968                         $errors[] = array( 'sessionfailure' );
2969                 }
2970
2971                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
2972                         $errors[] = array( 'actionthrottledtext' );
2973                 }
2974
2975                 // If there were errors, bail out now
2976                 if ( !empty( $errors ) ) {
2977                         return $errors;
2978                 }
2979
2980                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user );
2981         }
2982
2983         /**
2984          * Backend implementation of doRollback(), please refer there for parameter
2985          * and return value documentation
2986          *
2987          * NOTE: This function does NOT check ANY permissions, it just commits the
2988          * rollback to the DB. Therefore, you should only call this function direct-
2989          * ly if you want to use custom permissions checks. If you don't, use
2990          * doRollback() instead.
2991          * @param string $fromP Name of the user whose edits to rollback.
2992          * @param string $summary Custom summary. Set to default summary if empty.
2993          * @param bool $bot If true, mark all reverted edits as bot.
2994          *
2995          * @param array $resultDetails Contains result-specific array of additional values
2996          * @param User $guser The user performing the rollback
2997          * @return array
2998          */
2999         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser ) {
3000                 global $wgUseRCPatrol, $wgContLang;
3001
3002                 $dbw = wfGetDB( DB_MASTER );
3003
3004                 if ( wfReadOnly() ) {
3005                         return array( array( 'readonlytext' ) );
3006                 }
3007
3008                 // Get the last editor
3009                 $current = $this->getRevision();
3010                 if ( is_null( $current ) ) {
3011                         // Something wrong... no page?
3012                         return array( array( 'notanarticle' ) );
3013                 }
3014
3015                 $from = str_replace( '_', ' ', $fromP );
3016                 // User name given should match up with the top revision.
3017                 // If the user was deleted then $from should be empty.
3018                 if ( $from != $current->getUserText() ) {
3019                         $resultDetails = array( 'current' => $current );
3020                         return array( array( 'alreadyrolled',
3021                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3022                                 htmlspecialchars( $fromP ),
3023                                 htmlspecialchars( $current->getUserText() )
3024                         ) );
3025                 }
3026
3027                 // Get the last edit not by this guy...
3028                 // Note: these may not be public values
3029                 $user = intval( $current->getRawUser() );
3030                 $user_text = $dbw->addQuotes( $current->getRawUserText() );
3031                 $s = $dbw->selectRow( 'revision',
3032                         array( 'rev_id', 'rev_timestamp', 'rev_deleted' ),
3033                         array( 'rev_page' => $current->getPage(),
3034                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3035                         ), __METHOD__,
3036                         array( 'USE INDEX' => 'page_timestamp',
3037                                 'ORDER BY' => 'rev_timestamp DESC' )
3038                         );
3039                 if ( $s === false ) {
3040                         // No one else ever edited this page
3041                         return array( array( 'cantrollback' ) );
3042                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3043                         || $s->rev_deleted & Revision::DELETED_USER
3044                 ) {
3045                         // Only admins can see this text
3046                         return array( array( 'notvisiblerev' ) );
3047                 }
3048
3049                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3050                 // This is done before the rollback edit to have patrolling also on failure (bug 62157).
3051                 $set = array();
3052                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3053                         // Mark all reverted edits as bot
3054                         $set['rc_bot'] = 1;
3055                 }
3056
3057                 if ( $wgUseRCPatrol ) {
3058                         // Mark all reverted edits as patrolled
3059                         $set['rc_patrolled'] = 1;
3060                 }
3061
3062                 if ( count( $set ) ) {
3063                         $dbw->update( 'recentchanges', $set,
3064                                 array( /* WHERE */
3065                                         'rc_cur_id' => $current->getPage(),
3066                                         'rc_user_text' => $current->getUserText(),
3067                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3068                                 ), __METHOD__
3069                         );
3070                 }
3071
3072                 // Generate the edit summary if necessary
3073                 $target = Revision::newFromId( $s->rev_id );
3074                 if ( empty( $summary ) ) {
3075                         if ( $from == '' ) { // no public user name
3076                                 $summary = wfMessage( 'revertpage-nouser' );
3077                         } else {
3078                                 $summary = wfMessage( 'revertpage' );
3079                         }
3080                 }
3081
3082                 // Allow the custom summary to use the same args as the default message
3083                 $args = array(
3084                         $target->getUserText(), $from, $s->rev_id,
3085                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3086                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3087                 );
3088                 if ( $summary instanceof Message ) {
3089                         $summary = $summary->params( $args )->inContentLanguage()->text();
3090                 } else {
3091                         $summary = wfMsgReplaceArgs( $summary, $args );
3092                 }
3093
3094                 // Trim spaces on user supplied text
3095                 $summary = trim( $summary );
3096
3097                 // Truncate for whole multibyte characters.
3098                 $summary = $wgContLang->truncate( $summary, 255 );
3099
3100                 // Save
3101                 $flags = EDIT_UPDATE;
3102
3103                 if ( $guser->isAllowed( 'minoredit' ) ) {
3104                         $flags |= EDIT_MINOR;
3105                 }
3106
3107                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3108                         $flags |= EDIT_FORCE_BOT;
3109                 }
3110
3111                 // Actually store the edit
3112                 $status = $this->doEditContent(
3113                         $target->getContent(),
3114                         $summary,
3115                         $flags,
3116                         $target->getId(),
3117                         $guser
3118                 );
3119
3120                 if ( !$status->isOK() ) {
3121                         return $status->getErrorsArray();
3122                 }
3123
3124                 // raise error, when the edit is an edit without a new version
3125                 if ( empty( $status->value['revision'] ) ) {
3126                         $resultDetails = array( 'current' => $current );
3127                         return array( array( 'alreadyrolled',
3128                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3129                                         htmlspecialchars( $fromP ),
3130                                         htmlspecialchars( $current->getUserText() )
3131                         ) );
3132                 }
3133
3134                 $revId = $status->value['revision']->getId();
3135
3136                 Hooks::run( 'ArticleRollbackComplete', array( $this, $guser, $target, $current ) );
3137
3138                 $resultDetails = array(
3139                         'summary' => $summary,
3140                         'current' => $current,
3141                         'target' => $target,
3142                         'newid' => $revId
3143                 );
3144
3145                 return array();
3146         }
3147
3148         /**
3149          * The onArticle*() functions are supposed to be a kind of hooks
3150          * which should be called whenever any of the specified actions
3151          * are done.
3152          *
3153          * This is a good place to put code to clear caches, for instance.
3154          *
3155          * This is called on page move and undelete, as well as edit
3156          *
3157          * @param Title $title
3158          */
3159         public static function onArticleCreate( $title ) {
3160                 // Update existence markers on article/talk tabs...
3161                 $other = $title->getOtherPage();
3162
3163                 $other->invalidateCache();
3164                 $other->purgeSquid();
3165
3166                 $title->touchLinks();
3167                 $title->purgeSquid();
3168                 $title->deleteTitleProtection();
3169         }
3170
3171         /**
3172          * Clears caches when article is deleted
3173          *
3174          * @param Title $title
3175          */
3176         public static function onArticleDelete( $title ) {
3177                 // Update existence markers on article/talk tabs...
3178                 $other = $title->getOtherPage();
3179
3180                 $other->invalidateCache();
3181                 $other->purgeSquid();
3182
3183                 $title->touchLinks();
3184                 $title->purgeSquid();
3185
3186                 // File cache
3187                 HTMLFileCache::clearFileCache( $title );
3188                 InfoAction::invalidateCache( $title );
3189
3190                 // Messages
3191                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3192                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3193                 }
3194
3195                 // Images
3196                 if ( $title->getNamespace() == NS_FILE ) {
3197                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
3198                         $update->doUpdate();
3199                 }
3200
3201                 // User talk pages
3202                 if ( $title->getNamespace() == NS_USER_TALK ) {
3203                         $user = User::newFromName( $title->getText(), false );
3204                         if ( $user ) {
3205                                 $user->setNewtalk( false );
3206                         }
3207                 }
3208
3209                 // Image redirects
3210                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3211         }
3212
3213         /**
3214          * Purge caches on page update etc
3215          *
3216          * @param Title $title
3217          * @todo Verify that $title is always a Title object (and never false or
3218          *   null), add Title hint to parameter $title.
3219          */
3220         public static function onArticleEdit( $title ) {
3221                 // Invalidate caches of articles which include this page
3222                 DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
3223
3224                 // Invalidate the caches of all pages which redirect here
3225                 DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
3226
3227                 // Purge squid for this page only
3228                 $title->purgeSquid();
3229
3230                 // Clear file cache for this page only
3231                 HTMLFileCache::clearFileCache( $title );
3232                 InfoAction::invalidateCache( $title );
3233         }
3234
3235         /**#@-*/
3236
3237         /**
3238          * Returns a list of categories this page is a member of.
3239          * Results will include hidden categories
3240          *
3241          * @return TitleArray
3242          */
3243         public function getCategories() {
3244                 $id = $this->getId();
3245                 if ( $id == 0 ) {
3246                         return TitleArray::newFromResult( new FakeResultWrapper( array() ) );
3247                 }
3248
3249                 $dbr = wfGetDB( DB_SLAVE );
3250                 $res = $dbr->select( 'categorylinks',
3251                         array( 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ),
3252                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3253                         // as not being aliases, and NS_CATEGORY is numeric
3254                         array( 'cl_from' => $id ),
3255                         __METHOD__ );
3256
3257                 return TitleArray::newFromResult( $res );
3258         }
3259
3260         /**
3261          * Returns a list of hidden categories this page is a member of.
3262          * Uses the page_props and categorylinks tables.
3263          *
3264          * @return array Array of Title objects
3265          */
3266         public function getHiddenCategories() {
3267                 $result = array();
3268                 $id = $this->getId();
3269
3270                 if ( $id == 0 ) {
3271                         return array();
3272                 }
3273
3274                 $dbr = wfGetDB( DB_SLAVE );
3275                 $res = $dbr->select( array( 'categorylinks', 'page_props', 'page' ),
3276                         array( 'cl_to' ),
3277                         array( 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3278                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ),
3279                         __METHOD__ );
3280
3281                 if ( $res !== false ) {
3282                         foreach ( $res as $row ) {
3283                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3284                         }
3285                 }
3286
3287                 return $result;
3288         }
3289
3290         /**
3291          * Return an applicable autosummary if one exists for the given edit.
3292          * @param string|null $oldtext The previous text of the page.
3293          * @param string|null $newtext The submitted text of the page.
3294          * @param int $flags Bitmask: a bitmask of flags submitted for the edit.
3295          * @return string An appropriate autosummary, or an empty string.
3296          *
3297          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3298          */
3299         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3300                 // NOTE: stub for backwards-compatibility. assumes the given text is
3301                 // wikitext. will break horribly if it isn't.
3302
3303                 ContentHandler::deprecated( __METHOD__, '1.21' );
3304
3305                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3306                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3307                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3308
3309                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3310         }
3311
3312         /**
3313          * Auto-generates a deletion reason
3314          *
3315          * @param bool &$hasHistory Whether the page has a history
3316          * @return string|bool String containing deletion reason or empty string, or boolean false
3317          *    if no revision occurred
3318          */
3319         public function getAutoDeleteReason( &$hasHistory ) {
3320                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3321         }
3322
3323         /**
3324          * Update all the appropriate counts in the category table, given that
3325          * we've added the categories $added and deleted the categories $deleted.
3326          *
3327          * @param array $added The names of categories that were added
3328          * @param array $deleted The names of categories that were deleted
3329          */
3330         public function updateCategoryCounts( array $added, array $deleted ) {
3331                 $that = $this;
3332                 $method = __METHOD__;
3333                 $dbw = wfGetDB( DB_MASTER );
3334
3335                 // Do this at the end of the commit to reduce lock wait timeouts
3336                 $dbw->onTransactionPreCommitOrIdle(
3337                         function () use ( $dbw, $that, $method, $added, $deleted ) {
3338                                 $ns = $that->getTitle()->getNamespace();
3339
3340                                 $addFields = array( 'cat_pages = cat_pages + 1' );
3341                                 $removeFields = array( 'cat_pages = cat_pages - 1' );
3342                                 if ( $ns == NS_CATEGORY ) {
3343                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3344                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3345                                 } elseif ( $ns == NS_FILE ) {
3346                                         $addFields[] = 'cat_files = cat_files + 1';
3347                                         $removeFields[] = 'cat_files = cat_files - 1';
3348                                 }
3349
3350                                 if ( count( $added ) ) {
3351                                         $insertRows = array();
3352                                         foreach ( $added as $cat ) {
3353                                                 $insertRows[] = array(
3354                                                         'cat_title'   => $cat,
3355                                                         'cat_pages'   => 1,
3356                                                         'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3357                                                         'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3358                                                 );
3359                                         }
3360                                         $dbw->upsert(
3361                                                 'category',
3362                                                 $insertRows,
3363                                                 array( 'cat_title' ),
3364                                                 $addFields,
3365                                                 $method
3366                                         );
3367                                 }
3368
3369                                 if ( count( $deleted ) ) {
3370                                         $dbw->update(
3371                                                 'category',
3372                                                 $removeFields,
3373                                                 array( 'cat_title' => $deleted ),
3374                                                 $method
3375                                         );
3376                                 }
3377
3378                                 foreach ( $added as $catName ) {
3379                                         $cat = Category::newFromName( $catName );
3380                                         Hooks::run( 'CategoryAfterPageAdded', array( $cat, $that ) );
3381                                 }
3382
3383                                 foreach ( $deleted as $catName ) {
3384                                         $cat = Category::newFromName( $catName );
3385                                         Hooks::run( 'CategoryAfterPageRemoved', array( $cat, $that ) );
3386                                 }
3387                         }
3388                 );
3389         }
3390
3391         /**
3392          * Updates cascading protections
3393          *
3394          * @param ParserOutput $parserOutput ParserOutput object for the current version
3395          */
3396         public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
3397                 if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
3398                         return;
3399                 }
3400
3401                 // templatelinks or imagelinks tables may have become out of sync,
3402                 // especially if using variable-based transclusions.
3403                 // For paranoia, check if things have changed and if
3404                 // so apply updates to the database. This will ensure
3405                 // that cascaded protections apply as soon as the changes
3406                 // are visible.
3407
3408                 // Get templates from templatelinks and images from imagelinks
3409                 $id = $this->getId();
3410
3411                 $dbLinks = array();
3412
3413                 $dbr = wfGetDB( DB_SLAVE );
3414                 $res = $dbr->select( array( 'templatelinks' ),
3415                         array( 'tl_namespace', 'tl_title' ),
3416                         array( 'tl_from' => $id ),
3417                         __METHOD__
3418                 );
3419
3420                 foreach ( $res as $row ) {
3421                         $dbLinks["{$row->tl_namespace}:{$row->tl_title}"] = true;
3422                 }
3423
3424                 $dbr = wfGetDB( DB_SLAVE );
3425                 $res = $dbr->select( array( 'imagelinks' ),
3426                         array( 'il_to' ),
3427                         array( 'il_from' => $id ),
3428                         __METHOD__
3429                 );
3430
3431                 foreach ( $res as $row ) {
3432                         $dbLinks[NS_FILE . ":{$row->il_to}"] = true;
3433                 }
3434
3435                 // Get templates and images from parser output.
3436                 $poLinks = array();
3437                 foreach ( $parserOutput->getTemplates() as $ns => $templates ) {
3438                         foreach ( $templates as $dbk => $id ) {
3439                                 $poLinks["$ns:$dbk"] = true;
3440                         }
3441                 }
3442                 foreach ( $parserOutput->getImages() as $dbk => $id ) {
3443                         $poLinks[NS_FILE . ":$dbk"] = true;
3444                 }
3445
3446                 // Get the diff
3447                 $links_diff = array_diff_key( $poLinks, $dbLinks );
3448
3449                 if ( count( $links_diff ) > 0 ) {
3450                         // Whee, link updates time.
3451                         // Note: we are only interested in links here. We don't need to get
3452                         // other DataUpdate items from the parser output.
3453                         $u = new LinksUpdate( $this->mTitle, $parserOutput, false );
3454                         $u->doUpdate();
3455                 }
3456         }
3457
3458         /**
3459          * Return a list of templates used by this article.
3460          * Uses the templatelinks table
3461          *
3462          * @deprecated since 1.19; use Title::getTemplateLinksFrom()
3463          * @return array Array of Title objects
3464          */
3465         public function getUsedTemplates() {
3466                 return $this->mTitle->getTemplateLinksFrom();
3467         }
3468
3469         /**
3470          * This function is called right before saving the wikitext,
3471          * so we can do things like signatures and links-in-context.
3472          *
3473          * @deprecated since 1.19; use Parser::preSaveTransform() instead
3474          * @param string $text Article contents
3475          * @param User $user User doing the edit
3476          * @param ParserOptions $popts Parser options, default options for
3477          *   the user loaded if null given
3478          * @return string Article contents with altered wikitext markup (signatures
3479          *      converted, {{subst:}}, templates, etc.)
3480          */
3481         public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
3482                 global $wgParser, $wgUser;
3483
3484                 wfDeprecated( __METHOD__, '1.19' );
3485
3486                 $user = is_null( $user ) ? $wgUser : $user;
3487
3488                 if ( $popts === null ) {
3489                         $popts = ParserOptions::newFromUser( $user );
3490                 }
3491
3492                 return $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
3493         }
3494
3495         /**
3496          * Update the article's restriction field, and leave a log entry.
3497          *
3498          * @deprecated since 1.19
3499          * @param array $limit Set of restriction keys
3500          * @param string $reason
3501          * @param int &$cascade Set to false if cascading protection isn't allowed.
3502          * @param array $expiry Per restriction type expiration
3503          * @param User $user The user updating the restrictions
3504          * @return bool True on success
3505          */
3506         public function updateRestrictions(
3507                 $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
3508         ) {
3509                 global $wgUser;
3510
3511                 $user = is_null( $user ) ? $wgUser : $user;
3512
3513                 return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
3514         }
3515
3516         /**
3517          * Returns a list of updates to be performed when this page is deleted. The
3518          * updates should remove any information about this page from secondary data
3519          * stores such as links tables.
3520          *
3521          * @param Content|null $content Optional Content object for determining the
3522          *   necessary updates.
3523          * @return array An array of DataUpdates objects
3524          */
3525         public function getDeletionUpdates( Content $content = null ) {
3526                 if ( !$content ) {
3527                         // load content object, which may be used to determine the necessary updates
3528                         // XXX: the content may not be needed to determine the updates, then this would be overhead.
3529                         $content = $this->getContent( Revision::RAW );
3530                 }
3531
3532                 if ( !$content ) {
3533                         $updates = array();
3534                 } else {
3535                         $updates = $content->getDeletionUpdates( $this );
3536                 }
3537
3538                 Hooks::run( 'WikiPageDeletionUpdates', array( $this, $content, &$updates ) );
3539                 return $updates;
3540         }
3541 }