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 use \MediaWiki\Logger\LoggerFactory;
  24 use \MediaWiki\MediaWikiServices;
  25
  26 /**
  27  * Class representing a MediaWiki article and history.
  28  *
  29  * Some fields are public only for backwards-compatibility. Use accessors.
  30  * In the past, this class was part of Article.php and everything was public.
  31  */
  32 class WikiPage implements Page, IDBAccessObject {
  33         // Constants for $mDataLoadedFrom and related
  34
  35         /**
  36          * @var Title
  37          */
  38         public $mTitle = null;
  39
  40         /**@{{
  41          * @protected
  42          */
  43         public $mDataLoaded = false;         // !< Boolean
  44         public $mIsRedirect = false;         // !< Boolean
  45         public $mLatest = false;             // !< Integer (false means "not loaded")
  46         /**@}}*/
  47
  48         /** @var stdClass Map of cache fields (text, parser output, ect) for a proposed/new edit */
  49         public $mPreparedEdit = false;
  50
  51         /**
  52          * @var int
  53          */
  54         protected $mId = null;
  55
  56         /**
  57          * @var int One of the READ_* constants
  58          */
  59         protected $mDataLoadedFrom = self::READ_NONE;
  60
  61         /**
  62          * @var Title
  63          */
  64         protected $mRedirectTarget = null;
  65
  66         /**
  67          * @var Revision
  68          */
  69         protected $mLastRevision = null;
  70
  71         /**
  72          * @var string Timestamp of the current revision or empty string if not loaded
  73          */
  74         protected $mTimestamp = '';
  75
  76         /**
  77          * @var string
  78          */
  79         protected $mTouched = '19700101000000';
  80
  81         /**
  82          * @var string
  83          */
  84         protected $mLinksUpdated = '19700101000000';
  85
  86         const PURGE_CDN_CACHE = 1; // purge CDN cache for page variant URLs
  87         const PURGE_CLUSTER_PCACHE = 2; // purge parser cache in the local datacenter
  88         const PURGE_GLOBAL_PCACHE = 4; // set page_touched to clear parser cache in all datacenters
  89         const PURGE_ALL = 7;
  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          * Makes sure that the mTitle object is cloned
 101          * to the newly cloned WikiPage.
 102          */
 103         public function __clone() {
 104                 $this->mTitle = clone $this->mTitle;
 105         }
 106
 107         /**
 108          * Create a WikiPage object of the appropriate class for the given title.
 109          *
 110          * @param Title $title
 111          *
 112          * @throws MWException
 113          * @return WikiPage|WikiCategoryPage|WikiFilePage
 114          */
 115         public static function factory( Title $title ) {
 116                 $ns = $title->getNamespace();
 117
 118                 if ( $ns == NS_MEDIA ) {
 119                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 120                 } elseif ( $ns < 0 ) {
 121                         throw new MWException( "Invalid or virtual namespace $ns given." );
 122                 }
 123
 124                 switch ( $ns ) {
 125                         case NS_FILE:
 126                                 $page = new WikiFilePage( $title );
 127                                 break;
 128                         case NS_CATEGORY:
 129                                 $page = new WikiCategoryPage( $title );
 130                                 break;
 131                         default:
 132                                 $page = new WikiPage( $title );
 133                 }
 134
 135                 return $page;
 136         }
 137
 138         /**
 139          * Constructor from a page id
 140          *
 141          * @param int $id Article ID to load
 142          * @param string|int $from One of the following values:
 143          *        - "fromdb" or WikiPage::READ_NORMAL to select from a replica DB
 144          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 145          *
 146          * @return WikiPage|null
 147          */
 148         public static function newFromID( $id, $from = 'fromdb' ) {
 149                 // page id's are never 0 or negative, see bug 61166
 150                 if ( $id < 1 ) {
 151                         return null;
 152                 }
 153
 154                 $from = self::convertSelectType( $from );
 155                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_REPLICA );
 156                 $row = $db->selectRow(
 157                         'page', self::selectFields(), [ 'page_id' => $id ], __METHOD__ );
 158                 if ( !$row ) {
 159                         return null;
 160                 }
 161                 return self::newFromRow( $row, $from );
 162         }
 163
 164         /**
 165          * Constructor from a database row
 166          *
 167          * @since 1.20
 168          * @param object $row Database row containing at least fields returned by selectFields().
 169          * @param string|int $from Source of $data:
 170          *        - "fromdb" or WikiPage::READ_NORMAL: from a replica DB
 171          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 172          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 173          * @return WikiPage
 174          */
 175         public static function newFromRow( $row, $from = 'fromdb' ) {
 176                 $page = self::factory( Title::newFromRow( $row ) );
 177                 $page->loadFromRow( $row, $from );
 178                 return $page;
 179         }
 180
 181         /**
 182          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 183          *
 184          * @param object|string|int $type
 185          * @return mixed
 186          */
 187         private static function convertSelectType( $type ) {
 188                 switch ( $type ) {
 189                 case 'fromdb':
 190                         return self::READ_NORMAL;
 191                 case 'fromdbmaster':
 192                         return self::READ_LATEST;
 193                 case 'forupdate':
 194                         return self::READ_LOCKING;
 195                 default:
 196                         // It may already be an integer or whatever else
 197                         return $type;
 198                 }
 199         }
 200
 201         /**
 202          * @todo Move this UI stuff somewhere else
 203          *
 204          * @see ContentHandler::getActionOverrides
 205          */
 206         public function getActionOverrides() {
 207                 return $this->getContentHandler()->getActionOverrides();
 208         }
 209
 210         /**
 211          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 212          *
 213          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 214          *
 215          * @return ContentHandler
 216          *
 217          * @since 1.21
 218          */
 219         public function getContentHandler() {
 220                 return ContentHandler::getForModelID( $this->getContentModel() );
 221         }
 222
 223         /**
 224          * Get the title object of the article
 225          * @return Title Title object of this page
 226          */
 227         public function getTitle() {
 228                 return $this->mTitle;
 229         }
 230
 231         /**
 232          * Clear the object
 233          * @return void
 234          */
 235         public function clear() {
 236                 $this->mDataLoaded = false;
 237                 $this->mDataLoadedFrom = self::READ_NONE;
 238
 239                 $this->clearCacheFields();
 240         }
 241
 242         /**
 243          * Clear the object cache fields
 244          * @return void
 245          */
 246         protected function clearCacheFields() {
 247                 $this->mId = null;
 248                 $this->mRedirectTarget = null; // Title object if set
 249                 $this->mLastRevision = null; // Latest revision
 250                 $this->mTouched = '19700101000000';
 251                 $this->mLinksUpdated = '19700101000000';
 252                 $this->mTimestamp = '';
 253                 $this->mIsRedirect = false;
 254                 $this->mLatest = false;
 255                 // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 256                 // the requested rev ID and content against the cached one for equality. For most
 257                 // content types, the output should not change during the lifetime of this cache.
 258                 // Clearing it can cause extra parses on edit for no reason.
 259         }
 260
 261         /**
 262          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 263          * @return void
 264          * @since 1.23
 265          */
 266         public function clearPreparedEdit() {
 267                 $this->mPreparedEdit = false;
 268         }
 269
 270         /**
 271          * Return the list of revision fields that should be selected to create
 272          * a new page.
 273          *
 274          * @return array
 275          */
 276         public static function selectFields() {
 277                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 278
 279                 $fields = [
 280                         'page_id',
 281                         'page_namespace',
 282                         'page_title',
 283                         'page_restrictions',
 284                         'page_is_redirect',
 285                         'page_is_new',
 286                         'page_random',
 287                         'page_touched',
 288                         'page_links_updated',
 289                         'page_latest',
 290                         'page_len',
 291                 ];
 292
 293                 if ( $wgContentHandlerUseDB ) {
 294                         $fields[] = 'page_content_model';
 295                 }
 296
 297                 if ( $wgPageLanguageUseDB ) {
 298                         $fields[] = 'page_lang';
 299                 }
 300
 301                 return $fields;
 302         }
 303
 304         /**
 305          * Fetch a page record with the given conditions
 306          * @param IDatabase $dbr
 307          * @param array $conditions
 308          * @param array $options
 309          * @return object|bool Database result resource, or false on failure
 310          */
 311         protected function pageData( $dbr, $conditions, $options = [] ) {
 312                 $fields = self::selectFields();
 313
 314                 Hooks::run( 'ArticlePageDataBefore', [ &$this, &$fields ] );
 315
 316                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 317
 318                 Hooks::run( 'ArticlePageDataAfter', [ &$this, &$row ] );
 319
 320                 return $row;
 321         }
 322
 323         /**
 324          * Fetch a page record matching the Title object's namespace and title
 325          * using a sanitized title string
 326          *
 327          * @param IDatabase $dbr
 328          * @param Title $title
 329          * @param array $options
 330          * @return object|bool Database result resource, or false on failure
 331          */
 332         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
 333                 return $this->pageData( $dbr, [
 334                         'page_namespace' => $title->getNamespace(),
 335                         'page_title' => $title->getDBkey() ], $options );
 336         }
 337
 338         /**
 339          * Fetch a page record matching the requested ID
 340          *
 341          * @param IDatabase $dbr
 342          * @param int $id
 343          * @param array $options
 344          * @return object|bool Database result resource, or false on failure
 345          */
 346         public function pageDataFromId( $dbr, $id, $options = [] ) {
 347                 return $this->pageData( $dbr, [ 'page_id' => $id ], $options );
 348         }
 349
 350         /**
 351          * Load the object from a given source by title
 352          *
 353          * @param object|string|int $from One of the following:
 354          *   - A DB query result object.
 355          *   - "fromdb" or WikiPage::READ_NORMAL to get from a replica DB.
 356          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 357          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 358          *     using SELECT FOR UPDATE.
 359          *
 360          * @return void
 361          */
 362         public function loadPageData( $from = 'fromdb' ) {
 363                 $from = self::convertSelectType( $from );
 364                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 365                         // We already have the data from the correct location, no need to load it twice.
 366                         return;
 367                 }
 368
 369                 if ( is_int( $from ) ) {
 370                         list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 371                         $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 372
 373                         if ( !$data
 374                                 && $index == DB_REPLICA
 375                                 && wfGetLB()->getServerCount() > 1
 376                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
 377                         ) {
 378                                 $from = self::READ_LATEST;
 379                                 list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 380                                 $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 381                         }
 382                 } else {
 383                         // No idea from where the caller got this data, assume replica DB.
 384                         $data = $from;
 385                         $from = self::READ_NORMAL;
 386                 }
 387
 388                 $this->loadFromRow( $data, $from );
 389         }
 390
 391         /**
 392          * Load the object from a database row
 393          *
 394          * @since 1.20
 395          * @param object|bool $data DB row containing fields returned by selectFields() or false
 396          * @param string|int $from One of the following:
 397          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a replica DB
 398          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 399          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 400          *          the master DB using SELECT FOR UPDATE
 401          */
 402         public function loadFromRow( $data, $from ) {
 403                 $lc = LinkCache::singleton();
 404                 $lc->clearLink( $this->mTitle );
 405
 406                 if ( $data ) {
 407                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 408
 409                         $this->mTitle->loadFromRow( $data );
 410
 411                         // Old-fashioned restrictions
 412                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 413
 414                         $this->mId = intval( $data->page_id );
 415                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 416                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 417                         $this->mIsRedirect = intval( $data->page_is_redirect );
 418                         $this->mLatest = intval( $data->page_latest );
 419                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 420                         // Double-check the ID of any cached latest Revision object for consistency.
 421                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 422                                 $this->mLastRevision = null;
 423                                 $this->mTimestamp = '';
 424                         }
 425                 } else {
 426                         $lc->addBadLinkObj( $this->mTitle );
 427
 428                         $this->mTitle->loadFromRow( false );
 429
 430                         $this->clearCacheFields();
 431
 432                         $this->mId = 0;
 433                 }
 434
 435                 $this->mDataLoaded = true;
 436                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 437         }
 438
 439         /**
 440          * @return int Page ID
 441          */
 442         public function getId() {
 443                 if ( !$this->mDataLoaded ) {
 444                         $this->loadPageData();
 445                 }
 446                 return $this->mId;
 447         }
 448
 449         /**
 450          * @return bool Whether or not the page exists in the database
 451          */
 452         public function exists() {
 453                 if ( !$this->mDataLoaded ) {
 454                         $this->loadPageData();
 455                 }
 456                 return $this->mId > 0;
 457         }
 458
 459         /**
 460          * Check if this page is something we're going to be showing
 461          * some sort of sensible content for. If we return false, page
 462          * views (plain action=view) will return an HTTP 404 response,
 463          * so spiders and robots can know they're following a bad link.
 464          *
 465          * @return bool
 466          */
 467         public function hasViewableContent() {
 468                 return $this->mTitle->isKnown();
 469         }
 470
 471         /**
 472          * Tests if the article content represents a redirect
 473          *
 474          * @return bool
 475          */
 476         public function isRedirect() {
 477                 if ( !$this->mDataLoaded ) {
 478                         $this->loadPageData();
 479                 }
 480
 481                 return (bool)$this->mIsRedirect;
 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                         $cache = ObjectCache::getMainWANInstance();
 497
 498                         return $cache->getWithSetCallback(
 499                                 $cache->makeKey( 'page', 'content-model', $this->getLatest() ),
 500                                 $cache::TTL_MONTH,
 501                                 function () {
 502                                         $rev = $this->getRevision();
 503                                         if ( $rev ) {
 504                                                 // Look at the revision's actual content model
 505                                                 return $rev->getContentModel();
 506                                         } else {
 507                                                 $title = $this->mTitle->getPrefixedDBkey();
 508                                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 509                                                 return $this->mTitle->getContentModel();
 510                                         }
 511                                 }
 512                         );
 513                 }
 514
 515                 // use the default model for this page
 516                 return $this->mTitle->getContentModel();
 517         }
 518
 519         /**
 520          * Loads page_touched and returns a value indicating if it should be used
 521          * @return bool True if this page exists and is not a redirect
 522          */
 523         public function checkTouched() {
 524                 if ( !$this->mDataLoaded ) {
 525                         $this->loadPageData();
 526                 }
 527                 return ( $this->mId && !$this->mIsRedirect );
 528         }
 529
 530         /**
 531          * Get the page_touched field
 532          * @return string Containing GMT timestamp
 533          */
 534         public function getTouched() {
 535                 if ( !$this->mDataLoaded ) {
 536                         $this->loadPageData();
 537                 }
 538                 return $this->mTouched;
 539         }
 540
 541         /**
 542          * Get the page_links_updated field
 543          * @return string|null Containing GMT timestamp
 544          */
 545         public function getLinksTimestamp() {
 546                 if ( !$this->mDataLoaded ) {
 547                         $this->loadPageData();
 548                 }
 549                 return $this->mLinksUpdated;
 550         }
 551
 552         /**
 553          * Get the page_latest field
 554          * @return int The rev_id of current revision
 555          */
 556         public function getLatest() {
 557                 if ( !$this->mDataLoaded ) {
 558                         $this->loadPageData();
 559                 }
 560                 return (int)$this->mLatest;
 561         }
 562
 563         /**
 564          * Get the Revision object of the oldest revision
 565          * @return Revision|null
 566          */
 567         public function getOldestRevision() {
 568
 569                 // Try using the replica DB first, then try the master
 570                 $continue = 2;
 571                 $db = wfGetDB( DB_REPLICA );
 572                 $revSelectFields = Revision::selectFields();
 573
 574                 $row = null;
 575                 while ( $continue ) {
 576                         $row = $db->selectRow(
 577                                 [ 'page', 'revision' ],
 578                                 $revSelectFields,
 579                                 [
 580                                         'page_namespace' => $this->mTitle->getNamespace(),
 581                                         'page_title' => $this->mTitle->getDBkey(),
 582                                         'rev_page = page_id'
 583                                 ],
 584                                 __METHOD__,
 585                                 [
 586                                         'ORDER BY' => 'rev_timestamp ASC'
 587                                 ]
 588                         );
 589
 590                         if ( $row ) {
 591                                 $continue = 0;
 592                         } else {
 593                                 $db = wfGetDB( DB_MASTER );
 594                                 $continue--;
 595                         }
 596                 }
 597
 598                 return $row ? Revision::newFromRow( $row ) : null;
 599         }
 600
 601         /**
 602          * Loads everything except the text
 603          * This isn't necessary for all uses, so it's only done if needed.
 604          */
 605         protected function loadLastEdit() {
 606                 if ( $this->mLastRevision !== null ) {
 607                         return; // already loaded
 608                 }
 609
 610                 $latest = $this->getLatest();
 611                 if ( !$latest ) {
 612                         return; // page doesn't exist or is missing page_latest info
 613                 }
 614
 615                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 616                         // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always
 617                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 618                         // transactions, where S1 normally only sees changes committed before the first S1
 619                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 620                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 621                         // happened after the first S1 SELECT.
 622                         // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
 623                         $flags = Revision::READ_LOCKING;
 624                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 625                         // Bug T93976: if page_latest was loaded from the master, fetch the
 626                         // revision from there as well, as it may not exist yet on a replica DB.
 627                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 628                         $flags = Revision::READ_LATEST;
 629                 } else {
 630                         $flags = 0;
 631                 }
 632                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 633                 if ( $revision ) { // sanity
 634                         $this->setLastEdit( $revision );
 635                 }
 636         }
 637
 638         /**
 639          * Set the latest revision
 640          * @param Revision $revision
 641          */
 642         protected function setLastEdit( Revision $revision ) {
 643                 $this->mLastRevision = $revision;
 644                 $this->mTimestamp = $revision->getTimestamp();
 645         }
 646
 647         /**
 648          * Get the latest revision
 649          * @return Revision|null
 650          */
 651         public function getRevision() {
 652                 $this->loadLastEdit();
 653                 if ( $this->mLastRevision ) {
 654                         return $this->mLastRevision;
 655                 }
 656                 return null;
 657         }
 658
 659         /**
 660          * Get the content of the current revision. No side-effects...
 661          *
 662          * @param int $audience One of:
 663          *   Revision::FOR_PUBLIC       to be displayed to all users
 664          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 665          *   Revision::RAW              get the text regardless of permissions
 666          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 667          *   to the $audience parameter
 668          * @return Content|null The content of the current revision
 669          *
 670          * @since 1.21
 671          */
 672         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 673                 $this->loadLastEdit();
 674                 if ( $this->mLastRevision ) {
 675                         return $this->mLastRevision->getContent( $audience, $user );
 676                 }
 677                 return null;
 678         }
 679
 680         /**
 681          * Get the text of the current revision. No side-effects...
 682          *
 683          * @param int $audience One of:
 684          *   Revision::FOR_PUBLIC       to be displayed to all users
 685          *   Revision::FOR_THIS_USER    to be displayed to the given user
 686          *   Revision::RAW              get the text regardless of permissions
 687          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 688          *   to the $audience parameter
 689          * @return string|bool The text of the current revision
 690          * @deprecated since 1.21, getContent() should be used instead.
 691          */
 692         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 693                 ContentHandler::deprecated( __METHOD__, '1.21' );
 694
 695                 $this->loadLastEdit();
 696                 if ( $this->mLastRevision ) {
 697                         return $this->mLastRevision->getText( $audience, $user );
 698                 }
 699                 return false;
 700         }
 701
 702         /**
 703          * @return string MW timestamp of last article revision
 704          */
 705         public function getTimestamp() {
 706                 // Check if the field has been filled by WikiPage::setTimestamp()
 707                 if ( !$this->mTimestamp ) {
 708                         $this->loadLastEdit();
 709                 }
 710
 711                 return wfTimestamp( TS_MW, $this->mTimestamp );
 712         }
 713
 714         /**
 715          * Set the page timestamp (use only to avoid DB queries)
 716          * @param string $ts MW timestamp of last article revision
 717          * @return void
 718          */
 719         public function setTimestamp( $ts ) {
 720                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 721         }
 722
 723         /**
 724          * @param int $audience One of:
 725          *   Revision::FOR_PUBLIC       to be displayed to all users
 726          *   Revision::FOR_THIS_USER    to be displayed to the given user
 727          *   Revision::RAW              get the text regardless of permissions
 728          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 729          *   to the $audience parameter
 730          * @return int User ID for the user that made the last article revision
 731          */
 732         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 733                 $this->loadLastEdit();
 734                 if ( $this->mLastRevision ) {
 735                         return $this->mLastRevision->getUser( $audience, $user );
 736                 } else {
 737                         return -1;
 738                 }
 739         }
 740
 741         /**
 742          * Get the User object of the user who created the page
 743          * @param int $audience One of:
 744          *   Revision::FOR_PUBLIC       to be displayed to all users
 745          *   Revision::FOR_THIS_USER    to be displayed to the given user
 746          *   Revision::RAW              get the text regardless of permissions
 747          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 748          *   to the $audience parameter
 749          * @return User|null
 750          */
 751         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 752                 $revision = $this->getOldestRevision();
 753                 if ( $revision ) {
 754                         $userName = $revision->getUserText( $audience, $user );
 755                         return User::newFromName( $userName, false );
 756                 } else {
 757                         return null;
 758                 }
 759         }
 760
 761         /**
 762          * @param int $audience One of:
 763          *   Revision::FOR_PUBLIC       to be displayed to all users
 764          *   Revision::FOR_THIS_USER    to be displayed to the given user
 765          *   Revision::RAW              get the text regardless of permissions
 766          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 767          *   to the $audience parameter
 768          * @return string Username of the user that made the last article revision
 769          */
 770         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 771                 $this->loadLastEdit();
 772                 if ( $this->mLastRevision ) {
 773                         return $this->mLastRevision->getUserText( $audience, $user );
 774                 } else {
 775                         return '';
 776                 }
 777         }
 778
 779         /**
 780          * @param int $audience One of:
 781          *   Revision::FOR_PUBLIC       to be displayed to all users
 782          *   Revision::FOR_THIS_USER    to be displayed to the given user
 783          *   Revision::RAW              get the text regardless of permissions
 784          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 785          *   to the $audience parameter
 786          * @return string Comment stored for the last article revision
 787          */
 788         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 789                 $this->loadLastEdit();
 790                 if ( $this->mLastRevision ) {
 791                         return $this->mLastRevision->getComment( $audience, $user );
 792                 } else {
 793                         return '';
 794                 }
 795         }
 796
 797         /**
 798          * Returns true if last revision was marked as "minor edit"
 799          *
 800          * @return bool Minor edit indicator for the last article revision.
 801          */
 802         public function getMinorEdit() {
 803                 $this->loadLastEdit();
 804                 if ( $this->mLastRevision ) {
 805                         return $this->mLastRevision->isMinor();
 806                 } else {
 807                         return false;
 808                 }
 809         }
 810
 811         /**
 812          * Determine whether a page would be suitable for being counted as an
 813          * article in the site_stats table based on the title & its content
 814          *
 815          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 816          *   if false, the current database state will be used
 817          * @return bool
 818          */
 819         public function isCountable( $editInfo = false ) {
 820                 global $wgArticleCountMethod;
 821
 822                 if ( !$this->mTitle->isContentPage() ) {
 823                         return false;
 824                 }
 825
 826                 if ( $editInfo ) {
 827                         $content = $editInfo->pstContent;
 828                 } else {
 829                         $content = $this->getContent();
 830                 }
 831
 832                 if ( !$content || $content->isRedirect() ) {
 833                         return false;
 834                 }
 835
 836                 $hasLinks = null;
 837
 838                 if ( $wgArticleCountMethod === 'link' ) {
 839                         // nasty special case to avoid re-parsing to detect links
 840
 841                         if ( $editInfo ) {
 842                                 // ParserOutput::getLinks() is a 2D array of page links, so
 843                                 // to be really correct we would need to recurse in the array
 844                                 // but the main array should only have items in it if there are
 845                                 // links.
 846                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 847                         } else {
 848                                 $hasLinks = (bool)wfGetDB( DB_REPLICA )->selectField( 'pagelinks', 1,
 849                                         [ 'pl_from' => $this->getId() ], __METHOD__ );
 850                         }
 851                 }
 852
 853                 return $content->isCountable( $hasLinks );
 854         }
 855
 856         /**
 857          * If this page is a redirect, get its target
 858          *
 859          * The target will be fetched from the redirect table if possible.
 860          * If this page doesn't have an entry there, call insertRedirect()
 861          * @return Title|null Title object, or null if this page is not a redirect
 862          */
 863         public function getRedirectTarget() {
 864                 if ( !$this->mTitle->isRedirect() ) {
 865                         return null;
 866                 }
 867
 868                 if ( $this->mRedirectTarget !== null ) {
 869                         return $this->mRedirectTarget;
 870                 }
 871
 872                 // Query the redirect table
 873                 $dbr = wfGetDB( DB_REPLICA );
 874                 $row = $dbr->selectRow( 'redirect',
 875                         [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ],
 876                         [ 'rd_from' => $this->getId() ],
 877                         __METHOD__
 878                 );
 879
 880                 // rd_fragment and rd_interwiki were added later, populate them if empty
 881                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 882                         $this->mRedirectTarget = Title::makeTitle(
 883                                 $row->rd_namespace, $row->rd_title,
 884                                 $row->rd_fragment, $row->rd_interwiki
 885                         );
 886                         return $this->mRedirectTarget;
 887                 }
 888
 889                 // This page doesn't have an entry in the redirect table
 890                 $this->mRedirectTarget = $this->insertRedirect();
 891                 return $this->mRedirectTarget;
 892         }
 893
 894         /**
 895          * Insert an entry for this page into the redirect table if the content is a redirect
 896          *
 897          * The database update will be deferred via DeferredUpdates
 898          *
 899          * Don't call this function directly unless you know what you're doing.
 900          * @return Title|null Title object or null if not a redirect
 901          */
 902         public function insertRedirect() {
 903                 $content = $this->getContent();
 904                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 905                 if ( !$retval ) {
 906                         return null;
 907                 }
 908
 909                 // Update the DB post-send if the page has not cached since now
 910                 $that = $this;
 911                 $latest = $this->getLatest();
 912                 DeferredUpdates::addCallableUpdate(
 913                         function () use ( $that, $retval, $latest ) {
 914                                 $that->insertRedirectEntry( $retval, $latest );
 915                         },
 916                         DeferredUpdates::POSTSEND,
 917                         wfGetDB( DB_MASTER )
 918                 );
 919
 920                 return $retval;
 921         }
 922
 923         /**
 924          * Insert or update the redirect table entry for this page to indicate it redirects to $rt
 925          * @param Title $rt Redirect target
 926          * @param int|null $oldLatest Prior page_latest for check and set
 927          */
 928         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
 929                 $dbw = wfGetDB( DB_MASTER );
 930                 $dbw->startAtomic( __METHOD__ );
 931
 932                 if ( !$oldLatest || $oldLatest == $this->lockAndGetLatest() ) {
 933                         $dbw->replace( 'redirect',
 934                                 [ 'rd_from' ],
 935                                 [
 936                                         'rd_from' => $this->getId(),
 937                                         'rd_namespace' => $rt->getNamespace(),
 938                                         'rd_title' => $rt->getDBkey(),
 939                                         'rd_fragment' => $rt->getFragment(),
 940                                         'rd_interwiki' => $rt->getInterwiki(),
 941                                 ],
 942                                 __METHOD__
 943                         );
 944                 }
 945
 946                 $dbw->endAtomic( __METHOD__ );
 947         }
 948
 949         /**
 950          * Get the Title object or URL this page redirects to
 951          *
 952          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 953          */
 954         public function followRedirect() {
 955                 return $this->getRedirectURL( $this->getRedirectTarget() );
 956         }
 957
 958         /**
 959          * Get the Title object or URL to use for a redirect. We use Title
 960          * objects for same-wiki, non-special redirects and URLs for everything
 961          * else.
 962          * @param Title $rt Redirect target
 963          * @return bool|Title|string False, Title object of local target, or string with URL
 964          */
 965         public function getRedirectURL( $rt ) {
 966                 if ( !$rt ) {
 967                         return false;
 968                 }
 969
 970                 if ( $rt->isExternal() ) {
 971                         if ( $rt->isLocal() ) {
 972                                 // Offsite wikis need an HTTP redirect.
 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( [ '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 the rest of the page we're on.
 987                         // Some pages are not valid targets.
 988                         if ( $rt->isValidRedirectTarget() ) {
 989                                 return $rt->getFullURL();
 990                         } else {
 991                                 return false;
 992                         }
 993                 }
 994
 995                 return $rt;
 996         }
 997
 998         /**
 999          * Get a list of users who have edited this article, not including the user who made
1000          * the most recent revision, which you can get from $article->getUser() if you want it
1001          * @return UserArrayFromResult
1002          */
1003         public function getContributors() {
1004                 // @todo FIXME: This is expensive; cache this info somewhere.
1005
1006                 $dbr = wfGetDB( DB_REPLICA );
1007
1008                 if ( $dbr->implicitGroupby() ) {
1009                         $realNameField = 'user_real_name';
1010                 } else {
1011                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1012                 }
1013
1014                 $tables = [ 'revision', 'user' ];
1015
1016                 $fields = [
1017                         'user_id' => 'rev_user',
1018                         'user_name' => 'rev_user_text',
1019                         $realNameField,
1020                         'timestamp' => 'MAX(rev_timestamp)',
1021                 ];
1022
1023                 $conds = [ 'rev_page' => $this->getId() ];
1024
1025                 // The user who made the top revision gets credited as "this page was last edited by
1026                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1027                 $user = $this->getUser();
1028                 if ( $user ) {
1029                         $conds[] = "rev_user != $user";
1030                 } else {
1031                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1032                 }
1033
1034                 // Username hidden?
1035                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0";
1036
1037                 $jconds = [
1038                         'user' => [ 'LEFT JOIN', 'rev_user = user_id' ],
1039                 ];
1040
1041                 $options = [
1042                         'GROUP BY' => [ 'rev_user', 'rev_user_text' ],
1043                         'ORDER BY' => 'timestamp DESC',
1044                 ];
1045
1046                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1047                 return new UserArrayFromResult( $res );
1048         }
1049
1050         /**
1051          * Should the parser cache be used?
1052          *
1053          * @param ParserOptions $parserOptions ParserOptions to check
1054          * @param int $oldId
1055          * @return bool
1056          */
1057         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
1058                 return $parserOptions->getStubThreshold() == 0
1059                         && $this->exists()
1060                         && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
1061                         && $this->getContentHandler()->isParserCacheSupported();
1062         }
1063
1064         /**
1065          * Get a ParserOutput for the given ParserOptions and revision ID.
1066          *
1067          * The parser cache will be used if possible. Cache misses that result
1068          * in parser runs are debounced with PoolCounter.
1069          *
1070          * @since 1.19
1071          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1072          * @param null|int      $oldid Revision ID to get the text from, passing null or 0 will
1073          *                             get the current revision (default value)
1074          * @param bool          $forceParse Force reindexing, regardless of cache settings
1075          * @return bool|ParserOutput ParserOutput or false if the revision was not found
1076          */
1077         public function getParserOutput(
1078                 ParserOptions $parserOptions, $oldid = null, $forceParse = false
1079         ) {
1080                 $useParserCache =
1081                         ( !$forceParse ) && $this->shouldCheckParserCache( $parserOptions, $oldid );
1082                 wfDebug( __METHOD__ .
1083                         ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1084                 if ( $parserOptions->getStubThreshold() ) {
1085                         wfIncrStats( 'pcache.miss.stub' );
1086                 }
1087
1088                 if ( $useParserCache ) {
1089                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1090                         if ( $parserOutput !== false ) {
1091                                 return $parserOutput;
1092                         }
1093                 }
1094
1095                 if ( $oldid === null || $oldid === 0 ) {
1096                         $oldid = $this->getLatest();
1097                 }
1098
1099                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1100                 $pool->execute();
1101
1102                 return $pool->getParserOutput();
1103         }
1104
1105         /**
1106          * Do standard deferred updates after page view (existing or missing page)
1107          * @param User $user The relevant user
1108          * @param int $oldid Revision id being viewed; if not given or 0, latest revision is assumed
1109          */
1110         public function doViewUpdates( User $user, $oldid = 0 ) {
1111                 if ( wfReadOnly() ) {
1112                         return;
1113                 }
1114
1115                 Hooks::run( 'PageViewUpdates', [ $this, $user ] );
1116                 // Update newtalk / watchlist notification status
1117                 try {
1118                         $user->clearNotification( $this->mTitle, $oldid );
1119                 } catch ( DBError $e ) {
1120                         // Avoid outage if the master is not reachable
1121                         MWExceptionHandler::logException( $e );
1122                 }
1123         }
1124
1125         /**
1126          * Perform the actions of a page purging
1127          * @param integer $flags Bitfield of WikiPage::PURGE_* constants
1128          * @return bool
1129          */
1130         public function doPurge( $flags = self::PURGE_ALL ) {
1131                 if ( !Hooks::run( 'ArticlePurge', [ &$this ] ) ) {
1132                         return false;
1133                 }
1134
1135                 if ( ( $flags & self::PURGE_GLOBAL_PCACHE ) == self::PURGE_GLOBAL_PCACHE ) {
1136                         // Set page_touched in the database to invalidate all DC caches
1137                         $this->mTitle->invalidateCache();
1138                 } elseif ( ( $flags & self::PURGE_CLUSTER_PCACHE ) == self::PURGE_CLUSTER_PCACHE ) {
1139                         // Delete the parser options key in the local cluster to invalidate the DC cache
1140                         ParserCache::singleton()->deleteOptionsKey( $this );
1141                         // Avoid sending HTTP 304s in ViewAction to the client who just issued the purge
1142                         $cache = ObjectCache::getLocalClusterInstance();
1143                         $cache->set(
1144                                 $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ),
1145                                 wfTimestamp( TS_MW ),
1146                                 $cache::TTL_HOUR
1147                         );
1148                 }
1149
1150                 if ( ( $flags & self::PURGE_CDN_CACHE ) == self::PURGE_CDN_CACHE ) {
1151                         // Clear any HTML file cache
1152                         HTMLFileCache::clearFileCache( $this->getTitle() );
1153                         // Send purge after any page_touched above update was committed
1154                         DeferredUpdates::addUpdate(
1155                                 new CdnCacheUpdate( $this->mTitle->getCdnUrls() ),
1156                                 DeferredUpdates::PRESEND
1157                         );
1158                 }
1159
1160                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1161                         // @todo move this logic to MessageCache
1162                         if ( $this->exists() ) {
1163                                 // NOTE: use transclusion text for messages.
1164                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1165
1166                                 $content = $this->getContent();
1167                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1168
1169                                 if ( $text === null ) {
1170                                         $text = false;
1171                                 }
1172                         } else {
1173                                 $text = false;
1174                         }
1175
1176                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1177                 }
1178
1179                 return true;
1180         }
1181
1182         /**
1183          * Get the last time a user explicitly purged the page via action=purge
1184          *
1185          * @return string|bool TS_MW timestamp or false
1186          * @since 1.28
1187          */
1188         public function getLastPurgeTimestamp() {
1189                 $cache = ObjectCache::getLocalClusterInstance();
1190
1191                 return $cache->get( $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ) );
1192         }
1193
1194         /**
1195          * Insert a new empty page record for this article.
1196          * This *must* be followed up by creating a revision
1197          * and running $this->updateRevisionOn( ... );
1198          * or else the record will be left in a funky state.
1199          * Best if all done inside a transaction.
1200          *
1201          * @param IDatabase $dbw
1202          * @param int|null $pageId Custom page ID that will be used for the insert statement
1203          *
1204          * @return bool|int The newly created page_id key; false if the row was not
1205          *   inserted, e.g. because the title already existed or because the specified
1206          *   page ID is already in use.
1207          */
1208         public function insertOn( $dbw, $pageId = null ) {
1209                 $pageIdForInsert = $pageId ?: $dbw->nextSequenceValue( 'page_page_id_seq' );
1210                 $dbw->insert(
1211                         'page',
1212                         [
1213                                 'page_id'           => $pageIdForInsert,
1214                                 'page_namespace'    => $this->mTitle->getNamespace(),
1215                                 'page_title'        => $this->mTitle->getDBkey(),
1216                                 'page_restrictions' => '',
1217                                 'page_is_redirect'  => 0, // Will set this shortly...
1218                                 'page_is_new'       => 1,
1219                                 'page_random'       => wfRandom(),
1220                                 'page_touched'      => $dbw->timestamp(),
1221                                 'page_latest'       => 0, // Fill this in shortly...
1222                                 'page_len'          => 0, // Fill this in shortly...
1223                         ],
1224                         __METHOD__,
1225                         'IGNORE'
1226                 );
1227
1228                 if ( $dbw->affectedRows() > 0 ) {
1229                         $newid = $pageId ?: $dbw->insertId();
1230                         $this->mId = $newid;
1231                         $this->mTitle->resetArticleID( $newid );
1232
1233                         return $newid;
1234                 } else {
1235                         return false; // nothing changed
1236                 }
1237         }
1238
1239         /**
1240          * Update the page record to point to a newly saved revision.
1241          *
1242          * @param IDatabase $dbw
1243          * @param Revision $revision For ID number, and text used to set
1244          *   length and redirect status fields
1245          * @param int $lastRevision If given, will not overwrite the page field
1246          *   when different from the currently set value.
1247          *   Giving 0 indicates the new page flag should be set on.
1248          * @param bool $lastRevIsRedirect If given, will optimize adding and
1249          *   removing rows in redirect table.
1250          * @return bool Success; false if the page row was missing or page_latest changed
1251          */
1252         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1253                 $lastRevIsRedirect = null
1254         ) {
1255                 global $wgContentHandlerUseDB;
1256
1257                 // Assertion to try to catch T92046
1258                 if ( (int)$revision->getId() === 0 ) {
1259                         throw new InvalidArgumentException(
1260                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1261                         );
1262                 }
1263
1264                 $content = $revision->getContent();
1265                 $len = $content ? $content->getSize() : 0;
1266                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1267
1268                 $conditions = [ 'page_id' => $this->getId() ];
1269
1270                 if ( !is_null( $lastRevision ) ) {
1271                         // An extra check against threads stepping on each other
1272                         $conditions['page_latest'] = $lastRevision;
1273                 }
1274
1275                 $row = [ /* SET */
1276                         'page_latest'      => $revision->getId(),
1277                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1278                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1279                         'page_is_redirect' => $rt !== null ? 1 : 0,
1280                         'page_len'         => $len,
1281                 ];
1282
1283                 if ( $wgContentHandlerUseDB ) {
1284                         $row['page_content_model'] = $revision->getContentModel();
1285                 }
1286
1287                 $dbw->update( 'page',
1288                         $row,
1289                         $conditions,
1290                         __METHOD__ );
1291
1292                 $result = $dbw->affectedRows() > 0;
1293                 if ( $result ) {
1294                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1295                         $this->setLastEdit( $revision );
1296                         $this->mLatest = $revision->getId();
1297                         $this->mIsRedirect = (bool)$rt;
1298                         // Update the LinkCache.
1299                         LinkCache::singleton()->addGoodLinkObj(
1300                                 $this->getId(),
1301                                 $this->mTitle,
1302                                 $len,
1303                                 $this->mIsRedirect,
1304                                 $this->mLatest,
1305                                 $revision->getContentModel()
1306                         );
1307                 }
1308
1309                 return $result;
1310         }
1311
1312         /**
1313          * Add row to the redirect table if this is a redirect, remove otherwise.
1314          *
1315          * @param IDatabase $dbw
1316          * @param Title $redirectTitle Title object pointing to the redirect target,
1317          *   or NULL if this is not a redirect
1318          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1319          *   removing rows in redirect table.
1320          * @return bool True on success, false on failure
1321          * @private
1322          */
1323         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1324                 // Always update redirects (target link might have changed)
1325                 // Update/Insert if we don't know if the last revision was a redirect or not
1326                 // Delete if changing from redirect to non-redirect
1327                 $isRedirect = !is_null( $redirectTitle );
1328
1329                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1330                         return true;
1331                 }
1332
1333                 if ( $isRedirect ) {
1334                         $this->insertRedirectEntry( $redirectTitle );
1335                 } else {
1336                         // This is not a redirect, remove row from redirect table
1337                         $where = [ 'rd_from' => $this->getId() ];
1338                         $dbw->delete( 'redirect', $where, __METHOD__ );
1339                 }
1340
1341                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1342                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1343                 }
1344
1345                 return ( $dbw->affectedRows() != 0 );
1346         }
1347
1348         /**
1349          * If the given revision is newer than the currently set page_latest,
1350          * update the page record. Otherwise, do nothing.
1351          *
1352          * @deprecated since 1.24, use updateRevisionOn instead
1353          *
1354          * @param IDatabase $dbw
1355          * @param Revision $revision
1356          * @return bool
1357          */
1358         public function updateIfNewerOn( $dbw, $revision ) {
1359
1360                 $row = $dbw->selectRow(
1361                         [ 'revision', 'page' ],
1362                         [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
1363                         [
1364                                 'page_id' => $this->getId(),
1365                                 'page_latest=rev_id' ],
1366                         __METHOD__ );
1367
1368                 if ( $row ) {
1369                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1370                                 return false;
1371                         }
1372                         $prev = $row->rev_id;
1373                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1374                 } else {
1375                         // No or missing previous revision; mark the page as new
1376                         $prev = 0;
1377                         $lastRevIsRedirect = null;
1378                 }
1379
1380                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1381
1382                 return $ret;
1383         }
1384
1385         /**
1386          * Get the content that needs to be saved in order to undo all revisions
1387          * between $undo and $undoafter. Revisions must belong to the same page,
1388          * must exist and must not be deleted
1389          * @param Revision $undo
1390          * @param Revision $undoafter Must be an earlier revision than $undo
1391          * @return Content|bool Content on success, false on failure
1392          * @since 1.21
1393          * Before we had the Content object, this was done in getUndoText
1394          */
1395         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1396                 $handler = $undo->getContentHandler();
1397                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1398         }
1399
1400         /**
1401          * Returns true if this page's content model supports sections.
1402          *
1403          * @return bool
1404          *
1405          * @todo The skin should check this and not offer section functionality if
1406          *   sections are not supported.
1407          * @todo The EditPage should check this and not offer section functionality
1408          *   if sections are not supported.
1409          */
1410         public function supportsSections() {
1411                 return $this->getContentHandler()->supportsSections();
1412         }
1413
1414         /**
1415          * @param string|number|null|bool $sectionId Section identifier as a number or string
1416          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1417          * or 'new' for a new section.
1418          * @param Content $sectionContent New content of the section.
1419          * @param string $sectionTitle New section's subject, only if $section is "new".
1420          * @param string $edittime Revision timestamp or null to use the current revision.
1421          *
1422          * @throws MWException
1423          * @return Content|null New complete article content, or null if error.
1424          *
1425          * @since 1.21
1426          * @deprecated since 1.24, use replaceSectionAtRev instead
1427          */
1428         public function replaceSectionContent(
1429                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
1430         ) {
1431
1432                 $baseRevId = null;
1433                 if ( $edittime && $sectionId !== 'new' ) {
1434                         $dbr = wfGetDB( DB_REPLICA );
1435                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1436                         // Try the master if this thread may have just added it.
1437                         // This could be abstracted into a Revision method, but we don't want
1438                         // to encourage loading of revisions by timestamp.
1439                         if ( !$rev
1440                                 && wfGetLB()->getServerCount() > 1
1441                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1442                         ) {
1443                                 $dbw = wfGetDB( DB_MASTER );
1444                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1445                         }
1446                         if ( $rev ) {
1447                                 $baseRevId = $rev->getId();
1448                         }
1449                 }
1450
1451                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1452         }
1453
1454         /**
1455          * @param string|number|null|bool $sectionId Section identifier as a number or string
1456          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1457          * or 'new' for a new section.
1458          * @param Content $sectionContent New content of the section.
1459          * @param string $sectionTitle New section's subject, only if $section is "new".
1460          * @param int|null $baseRevId
1461          *
1462          * @throws MWException
1463          * @return Content|null New complete article content, or null if error.
1464          *
1465          * @since 1.24
1466          */
1467         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1468                 $sectionTitle = '', $baseRevId = null
1469         ) {
1470
1471                 if ( strval( $sectionId ) === '' ) {
1472                         // Whole-page edit; let the whole text through
1473                         $newContent = $sectionContent;
1474                 } else {
1475                         if ( !$this->supportsSections() ) {
1476                                 throw new MWException( "sections not supported for content model " .
1477                                         $this->getContentHandler()->getModelID() );
1478                         }
1479
1480                         // Bug 30711: always use current version when adding a new section
1481                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1482                                 $oldContent = $this->getContent();
1483                         } else {
1484                                 $rev = Revision::newFromId( $baseRevId );
1485                                 if ( !$rev ) {
1486                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1487                                                 $this->getId() . "; section: $sectionId)\n" );
1488                                         return null;
1489                                 }
1490
1491                                 $oldContent = $rev->getContent();
1492                         }
1493
1494                         if ( !$oldContent ) {
1495                                 wfDebug( __METHOD__ . ": no page text\n" );
1496                                 return null;
1497                         }
1498
1499                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1500                 }
1501
1502                 return $newContent;
1503         }
1504
1505         /**
1506          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1507          * @param int $flags
1508          * @return int Updated $flags
1509          */
1510         public function checkFlags( $flags ) {
1511                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1512                         if ( $this->exists() ) {
1513                                 $flags |= EDIT_UPDATE;
1514                         } else {
1515                                 $flags |= EDIT_NEW;
1516                         }
1517                 }
1518
1519                 return $flags;
1520         }
1521
1522         /**
1523          * Change an existing article or create a new article. Updates RC and all necessary caches,
1524          * optionally via the deferred update array.
1525          *
1526          * @param string $text New text
1527          * @param string $summary Edit summary
1528          * @param int $flags Bitfield:
1529          *      EDIT_NEW
1530          *          Article is known or assumed to be non-existent, create a new one
1531          *      EDIT_UPDATE
1532          *          Article is known or assumed to be pre-existing, update it
1533          *      EDIT_MINOR
1534          *          Mark this edit minor, if the user is allowed to do so
1535          *      EDIT_SUPPRESS_RC
1536          *          Do not log the change in recentchanges
1537          *      EDIT_FORCE_BOT
1538          *          Mark the edit a "bot" edit regardless of user rights
1539          *      EDIT_AUTOSUMMARY
1540          *          Fill in blank summaries with generated text where possible
1541          *      EDIT_INTERNAL
1542          *          Signal that the page retrieve/save cycle happened entirely in this request.
1543          *
1544          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1545          * article will be detected. If EDIT_UPDATE is specified and the article
1546          * doesn't exist, the function will return an edit-gone-missing error. If
1547          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1548          * error will be returned. These two conditions are also possible with
1549          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1550          *
1551          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1552          *   This is not the parent revision ID, rather the revision ID for older
1553          *   content used as the source for a rollback, for example.
1554          * @param User $user The user doing the edit
1555          *
1556          * @throws MWException
1557          * @return Status Possible errors:
1558          *   edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1559          *     set the fatal flag of $status
1560          *   edit-gone-missing: In update mode, but the article didn't exist.
1561          *   edit-conflict: In update mode, the article changed unexpectedly.
1562          *   edit-no-change: Warning that the text was the same as before.
1563          *   edit-already-exists: In creation mode, but the article already exists.
1564          *
1565          * Extensions may define additional errors.
1566          *
1567          * $return->value will contain an associative array with members as follows:
1568          *     new: Boolean indicating if the function attempted to create a new article.
1569          *     revision: The revision object for the inserted revision, or null.
1570          *
1571          * Compatibility note: this function previously returned a boolean value
1572          * indicating success/failure
1573          *
1574          * @deprecated since 1.21: use doEditContent() instead.
1575          */
1576         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1577                 ContentHandler::deprecated( __METHOD__, '1.21' );
1578
1579                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1580
1581                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1582         }
1583
1584         /**
1585          * Change an existing article or create a new article. Updates RC and all necessary caches,
1586          * optionally via the deferred update array.
1587          *
1588          * @param Content $content New content
1589          * @param string $summary Edit summary
1590          * @param int $flags Bitfield:
1591          *      EDIT_NEW
1592          *          Article is known or assumed to be non-existent, create a new one
1593          *      EDIT_UPDATE
1594          *          Article is known or assumed to be pre-existing, update it
1595          *      EDIT_MINOR
1596          *          Mark this edit minor, if the user is allowed to do so
1597          *      EDIT_SUPPRESS_RC
1598          *          Do not log the change in recentchanges
1599          *      EDIT_FORCE_BOT
1600          *          Mark the edit a "bot" edit regardless of user rights
1601          *      EDIT_AUTOSUMMARY
1602          *          Fill in blank summaries with generated text where possible
1603          *      EDIT_INTERNAL
1604          *          Signal that the page retrieve/save cycle happened entirely in this request.
1605          *
1606          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1607          * article will be detected. If EDIT_UPDATE is specified and the article
1608          * doesn't exist, the function will return an edit-gone-missing error. If
1609          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1610          * error will be returned. These two conditions are also possible with
1611          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1612          *
1613          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1614          *   This is not the parent revision ID, rather the revision ID for older
1615          *   content used as the source for a rollback, for example.
1616          * @param User $user The user doing the edit
1617          * @param string $serialFormat Format for storing the content in the
1618          *   database.
1619          * @param array|null $tags Change tags to apply to this edit
1620          * Callers are responsible for permission checks
1621          * (with ChangeTags::canAddTagsAccompanyingChange)
1622          *
1623          * @throws MWException
1624          * @return Status Possible errors:
1625          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1626          *       set the fatal flag of $status.
1627          *     edit-gone-missing: In update mode, but the article didn't exist.
1628          *     edit-conflict: In update mode, the article changed unexpectedly.
1629          *     edit-no-change: Warning that the text was the same as before.
1630          *     edit-already-exists: In creation mode, but the article already exists.
1631          *
1632          *  Extensions may define additional errors.
1633          *
1634          *  $return->value will contain an associative array with members as follows:
1635          *     new: Boolean indicating if the function attempted to create a new article.
1636          *     revision: The revision object for the inserted revision, or null.
1637          *
1638          * @since 1.21
1639          * @throws MWException
1640          */
1641         public function doEditContent(
1642                 Content $content, $summary, $flags = 0, $baseRevId = false,
1643                 User $user = null, $serialFormat = null, $tags = []
1644         ) {
1645                 global $wgUser, $wgUseAutomaticEditSummaries;
1646
1647                 // Old default parameter for $tags was null
1648                 if ( $tags === null ) {
1649                         $tags = [];
1650                 }
1651
1652                 // Low-level sanity check
1653                 if ( $this->mTitle->getText() === '' ) {
1654                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1655                 }
1656                 // Make sure the given content type is allowed for this page
1657                 if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
1658                         return Status::newFatal( 'content-not-allowed-here',
1659                                 ContentHandler::getLocalizedName( $content->getModel() ),
1660                                 $this->mTitle->getPrefixedText()
1661                         );
1662                 }
1663
1664                 // Load the data from the master database if needed.
1665                 // The caller may already loaded it from the master or even loaded it using
1666                 // SELECT FOR UPDATE, so do not override that using clear().
1667                 $this->loadPageData( 'fromdbmaster' );
1668
1669                 $user = $user ?: $wgUser;
1670                 $flags = $this->checkFlags( $flags );
1671
1672                 // Trigger pre-save hook (using provided edit summary)
1673                 $hookStatus = Status::newGood( [] );
1674                 $hook_args = [ &$this, &$user, &$content, &$summary,
1675                                                         $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
1676                 // Check if the hook rejected the attempted save
1677                 if ( !Hooks::run( 'PageContentSave', $hook_args )
1678                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args )
1679                 ) {
1680                         if ( $hookStatus->isOK() ) {
1681                                 // Hook returned false but didn't call fatal(); use generic message
1682                                 $hookStatus->fatal( 'edit-hook-aborted' );
1683                         }
1684
1685                         return $hookStatus;
1686                 }
1687
1688                 $old_revision = $this->getRevision(); // current revision
1689                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1690
1691                 if ( $old_content && $old_content->getModel() !== $content->getModel() ) {
1692                         $tags[] = 'mw-contentmodelchange';
1693                 }
1694
1695                 // Provide autosummaries if one is not provided and autosummaries are enabled
1696                 if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
1697                         $handler = $content->getContentHandler();
1698                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1699                 }
1700
1701                 // Avoid statsd noise and wasted cycles check the edit stash (T136678)
1702                 if ( ( $flags & EDIT_INTERNAL ) || ( $flags & EDIT_FORCE_BOT ) ) {
1703                         $useCache = false;
1704                 } else {
1705                         $useCache = true;
1706                 }
1707
1708                 // Get the pre-save transform content and final parser output
1709                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat, $useCache );
1710                 $pstContent = $editInfo->pstContent; // Content object
1711                 $meta = [
1712                         'bot' => ( $flags & EDIT_FORCE_BOT ),
1713                         'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
1714                         'serialized' => $editInfo->pst,
1715                         'serialFormat' => $serialFormat,
1716                         'baseRevId' => $baseRevId,
1717                         'oldRevision' => $old_revision,
1718                         'oldContent' => $old_content,
1719                         'oldId' => $this->getLatest(),
1720                         'oldIsRedirect' => $this->isRedirect(),
1721                         'oldCountable' => $this->isCountable(),
1722                         'tags' => ( $tags !== null ) ? (array)$tags : []
1723                 ];
1724
1725                 // Actually create the revision and create/update the page
1726                 if ( $flags & EDIT_UPDATE ) {
1727                         $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
1728                 } else {
1729                         $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
1730                 }
1731
1732                 // Promote user to any groups they meet the criteria for
1733                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1734                         $user->addAutopromoteOnceGroups( 'onEdit' );
1735                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1736                 } );
1737
1738                 return $status;
1739         }
1740
1741         /**
1742          * @param Content $content Pre-save transform content
1743          * @param integer $flags
1744          * @param User $user
1745          * @param string $summary
1746          * @param array $meta
1747          * @return Status
1748          * @throws DBUnexpectedError
1749          * @throws Exception
1750          * @throws FatalError
1751          * @throws MWException
1752          */
1753         private function doModify(
1754                 Content $content, $flags, User $user, $summary, array $meta
1755         ) {
1756                 global $wgUseRCPatrol;
1757
1758                 // Update article, but only if changed.
1759                 $status = Status::newGood( [ 'new' => false, 'revision' => null ] );
1760
1761                 // Convenience variables
1762                 $now = wfTimestampNow();
1763                 $oldid = $meta['oldId'];
1764                 /** @var $oldContent Content|null */
1765                 $oldContent = $meta['oldContent'];
1766                 $newsize = $content->getSize();
1767
1768                 if ( !$oldid ) {
1769                         // Article gone missing
1770                         $status->fatal( 'edit-gone-missing' );
1771
1772                         return $status;
1773                 } elseif ( !$oldContent ) {
1774                         // Sanity check for bug 37225
1775                         throw new MWException( "Could not find text for current revision {$oldid}." );
1776                 }
1777
1778                 // @TODO: pass content object?!
1779                 $revision = new Revision( [
1780                         'page'       => $this->getId(),
1781                         'title'      => $this->mTitle, // for determining the default content model
1782                         'comment'    => $summary,
1783                         'minor_edit' => $meta['minor'],
1784                         'text'       => $meta['serialized'],
1785                         'len'        => $newsize,
1786                         'parent_id'  => $oldid,
1787                         'user'       => $user->getId(),
1788                         'user_text'  => $user->getName(),
1789                         'timestamp'  => $now,
1790                         'content_model' => $content->getModel(),
1791                         'content_format' => $meta['serialFormat'],
1792                 ] );
1793
1794                 $changed = !$content->equals( $oldContent );
1795
1796                 $dbw = wfGetDB( DB_MASTER );
1797
1798                 if ( $changed ) {
1799                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1800                         $status->merge( $prepStatus );
1801                         if ( !$status->isOK() ) {
1802                                 return $status;
1803                         }
1804
1805                         $dbw->startAtomic( __METHOD__ );
1806                         // Get the latest page_latest value while locking it.
1807                         // Do a CAS style check to see if it's the same as when this method
1808                         // started. If it changed then bail out before touching the DB.
1809                         $latestNow = $this->lockAndGetLatest();
1810                         if ( $latestNow != $oldid ) {
1811                                 $dbw->endAtomic( __METHOD__ );
1812                                 // Page updated or deleted in the mean time
1813                                 $status->fatal( 'edit-conflict' );
1814
1815                                 return $status;
1816                         }
1817
1818                         // At this point we are now comitted to returning an OK
1819                         // status unless some DB query error or other exception comes up.
1820                         // This way callers don't have to call rollback() if $status is bad
1821                         // unless they actually try to catch exceptions (which is rare).
1822
1823                         // Save the revision text
1824                         $revisionId = $revision->insertOn( $dbw );
1825                         // Update page_latest and friends to reflect the new revision
1826                         if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
1827                                 throw new MWException( "Failed to update page row to use new revision." );
1828                         }
1829
1830                         Hooks::run( 'NewRevisionFromEditComplete',
1831                                 [ $this, $revision, $meta['baseRevId'], $user ] );
1832
1833                         // Update recentchanges
1834                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1835                                 // Mark as patrolled if the user can do so
1836                                 $patrolled = $wgUseRCPatrol && !count(
1837                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1838                                 // Add RC row to the DB
1839                                 RecentChange::notifyEdit(
1840                                         $now,
1841                                         $this->mTitle,
1842                                         $revision->isMinor(),
1843                                         $user,
1844                                         $summary,
1845                                         $oldid,
1846                                         $this->getTimestamp(),
1847                                         $meta['bot'],
1848                                         '',
1849                                         $oldContent ? $oldContent->getSize() : 0,
1850                                         $newsize,
1851                                         $revisionId,
1852                                         $patrolled,
1853                                         $meta['tags']
1854                                 );
1855                         }
1856
1857                         $user->incEditCount();
1858
1859                         $dbw->endAtomic( __METHOD__ );
1860                         $this->mTimestamp = $now;
1861                 } else {
1862                         // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1863                         // related variables correctly. Likewise for {{REVISIONUSER}} (T135261).
1864                         $revision->setId( $this->getLatest() );
1865                         $revision->setUserIdAndName(
1866                                 $this->getUser( Revision::RAW ),
1867                                 $this->getUserText( Revision::RAW )
1868                         );
1869                 }
1870
1871                 if ( $changed ) {
1872                         // Return the new revision to the caller
1873                         $status->value['revision'] = $revision;
1874                 } else {
1875                         $status->warning( 'edit-no-change' );
1876                         // Update page_touched as updateRevisionOn() was not called.
1877                         // Other cache updates are managed in onArticleEdit() via doEditUpdates().
1878                         $this->mTitle->invalidateCache( $now );
1879                 }
1880
1881                 // Do secondary updates once the main changes have been committed...
1882                 DeferredUpdates::addUpdate(
1883                         new AtomicSectionUpdate(
1884                                 $dbw,
1885                                 __METHOD__,
1886                                 function () use (
1887                                         $revision, &$user, $content, $summary, &$flags,
1888                                         $changed, $meta, &$status
1889                                 ) {
1890                                         // Update links tables, site stats, etc.
1891                                         $this->doEditUpdates(
1892                                                 $revision,
1893                                                 $user,
1894                                                 [
1895                                                         'changed' => $changed,
1896                                                         'oldcountable' => $meta['oldCountable'],
1897                                                         'oldrevision' => $meta['oldRevision']
1898                                                 ]
1899                                         );
1900                                         // Trigger post-save hook
1901                                         $params = [ &$this, &$user, $content, $summary, $flags & EDIT_MINOR,
1902                                                 null, null, &$flags, $revision, &$status, $meta['baseRevId'] ];
1903                                         ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params );
1904                                         Hooks::run( 'PageContentSaveComplete', $params );
1905                                 }
1906                         ),
1907                         DeferredUpdates::PRESEND
1908                 );
1909
1910                 return $status;
1911         }
1912
1913         /**
1914          * @param Content $content Pre-save transform content
1915          * @param integer $flags
1916          * @param User $user
1917          * @param string $summary
1918          * @param array $meta
1919          * @return Status
1920          * @throws DBUnexpectedError
1921          * @throws Exception
1922          * @throws FatalError
1923          * @throws MWException
1924          */
1925         private function doCreate(
1926                 Content $content, $flags, User $user, $summary, array $meta
1927         ) {
1928                 global $wgUseRCPatrol, $wgUseNPPatrol;
1929
1930                 $status = Status::newGood( [ 'new' => true, 'revision' => null ] );
1931
1932                 $now = wfTimestampNow();
1933                 $newsize = $content->getSize();
1934                 $prepStatus = $content->prepareSave( $this, $flags, $meta['oldId'], $user );
1935                 $status->merge( $prepStatus );
1936                 if ( !$status->isOK() ) {
1937                         return $status;
1938                 }
1939
1940                 $dbw = wfGetDB( DB_MASTER );
1941                 $dbw->startAtomic( __METHOD__ );
1942
1943                 // Add the page record unless one already exists for the title
1944                 $newid = $this->insertOn( $dbw );
1945                 if ( $newid === false ) {
1946                         $dbw->endAtomic( __METHOD__ ); // nothing inserted
1947                         $status->fatal( 'edit-already-exists' );
1948
1949                         return $status; // nothing done
1950                 }
1951
1952                 // At this point we are now comitted to returning an OK
1953                 // status unless some DB query error or other exception comes up.
1954                 // This way callers don't have to call rollback() if $status is bad
1955                 // unless they actually try to catch exceptions (which is rare).
1956
1957                 // @TODO: pass content object?!
1958                 $revision = new Revision( [
1959                         'page'       => $newid,
1960                         'title'      => $this->mTitle, // for determining the default content model
1961                         'comment'    => $summary,
1962                         'minor_edit' => $meta['minor'],
1963                         'text'       => $meta['serialized'],
1964                         'len'        => $newsize,
1965                         'user'       => $user->getId(),
1966                         'user_text'  => $user->getName(),
1967                         'timestamp'  => $now,
1968                         'content_model' => $content->getModel(),
1969                         'content_format' => $meta['serialFormat'],
1970                 ] );
1971
1972                 // Save the revision text...
1973                 $revisionId = $revision->insertOn( $dbw );
1974                 // Update the page record with revision data
1975                 if ( !$this->updateRevisionOn( $dbw, $revision, 0 ) ) {
1976                         throw new MWException( "Failed to update page row to use new revision." );
1977                 }
1978
1979                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
1980
1981                 // Update recentchanges
1982                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1983                         // Mark as patrolled if the user can do so
1984                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) &&
1985                                 !count( $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1986                         // Add RC row to the DB
1987                         RecentChange::notifyNew(
1988                                 $now,
1989                                 $this->mTitle,
1990                                 $revision->isMinor(),
1991                                 $user,
1992                                 $summary,
1993                                 $meta['bot'],
1994                                 '',
1995                                 $newsize,
1996                                 $revisionId,
1997                                 $patrolled,
1998                                 $meta['tags']
1999                         );
2000                 }
2001
2002                 $user->incEditCount();
2003
2004                 $dbw->endAtomic( __METHOD__ );
2005                 $this->mTimestamp = $now;
2006
2007                 // Return the new revision to the caller
2008                 $status->value['revision'] = $revision;
2009
2010                 // Do secondary updates once the main changes have been committed...
2011                 DeferredUpdates::addUpdate(
2012                         new AtomicSectionUpdate(
2013                                 $dbw,
2014                                 __METHOD__,
2015                                 function () use (
2016                                         $revision, &$user, $content, $summary, &$flags, $meta, &$status
2017                                 ) {
2018                                         // Update links, etc.
2019                                         $this->doEditUpdates( $revision, $user, [ 'created' => true ] );
2020                                         // Trigger post-create hook
2021                                         $params = [ &$this, &$user, $content, $summary,
2022                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ];
2023                                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $params );
2024                                         Hooks::run( 'PageContentInsertComplete', $params );
2025                                         // Trigger post-save hook
2026                                         $params = array_merge( $params, [ &$status, $meta['baseRevId'] ] );
2027                                         ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params );
2028                                         Hooks::run( 'PageContentSaveComplete', $params );
2029
2030                                 }
2031                         ),
2032                         DeferredUpdates::PRESEND
2033                 );
2034
2035                 return $status;
2036         }
2037
2038         /**
2039          * Get parser options suitable for rendering the primary article wikitext
2040          *
2041          * @see ContentHandler::makeParserOptions
2042          *
2043          * @param IContextSource|User|string $context One of the following:
2044          *        - IContextSource: Use the User and the Language of the provided
2045          *          context
2046          *        - User: Use the provided User object and $wgLang for the language,
2047          *          so use an IContextSource object if possible.
2048          *        - 'canonical': Canonical options (anonymous user with default
2049          *          preferences and content language).
2050          * @return ParserOptions
2051          */
2052         public function makeParserOptions( $context ) {
2053                 $options = $this->getContentHandler()->makeParserOptions( $context );
2054
2055                 if ( $this->getTitle()->isConversionTable() ) {
2056                         // @todo ConversionTable should become a separate content model, so
2057                         // we don't need special cases like this one.
2058                         $options->disableContentConversion();
2059                 }
2060
2061                 return $options;
2062         }
2063
2064         /**
2065          * Prepare text which is about to be saved.
2066          * Returns a stdClass with source, pst and output members
2067          *
2068          * @param string $text
2069          * @param int|null $revid
2070          * @param User|null $user
2071          * @deprecated since 1.21: use prepareContentForEdit instead.
2072          * @return object
2073          */
2074         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2075                 ContentHandler::deprecated( __METHOD__, '1.21' );
2076                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2077                 return $this->prepareContentForEdit( $content, $revid, $user );
2078         }
2079
2080         /**
2081          * Prepare content which is about to be saved.
2082          * Returns a stdClass with source, pst and output members
2083          *
2084          * @param Content $content
2085          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
2086          *        revision ID is also accepted, but this is deprecated.
2087          * @param User|null $user
2088          * @param string|null $serialFormat
2089          * @param bool $useCache Check shared prepared edit cache
2090          *
2091          * @return object
2092          *
2093          * @since 1.21
2094          */
2095         public function prepareContentForEdit(
2096                 Content $content, $revision = null, User $user = null,
2097                 $serialFormat = null, $useCache = true
2098         ) {
2099                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2100
2101                 if ( is_object( $revision ) ) {
2102                         $revid = $revision->getId();
2103                 } else {
2104                         $revid = $revision;
2105                         // This code path is deprecated, and nothing is known to
2106                         // use it, so performance here shouldn't be a worry.
2107                         if ( $revid !== null ) {
2108                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2109                         } else {
2110                                 $revision = null;
2111                         }
2112                 }
2113
2114                 $user = is_null( $user ) ? $wgUser : $user;
2115                 // XXX: check $user->getId() here???
2116
2117                 // Use a sane default for $serialFormat, see bug 57026
2118                 if ( $serialFormat === null ) {
2119                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2120                 }
2121
2122                 if ( $this->mPreparedEdit
2123                         && isset( $this->mPreparedEdit->newContent )
2124                         && $this->mPreparedEdit->newContent->equals( $content )
2125                         && $this->mPreparedEdit->revid == $revid
2126                         && $this->mPreparedEdit->format == $serialFormat
2127                         // XXX: also check $user here?
2128                 ) {
2129                         // Already prepared
2130                         return $this->mPreparedEdit;
2131                 }
2132
2133                 // The edit may have already been prepared via api.php?action=stashedit
2134                 $cachedEdit = $useCache && $wgAjaxEditStash
2135                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2136                         : false;
2137
2138                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2139                 Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );
2140
2141                 $edit = (object)[];
2142                 if ( $cachedEdit ) {
2143                         $edit->timestamp = $cachedEdit->timestamp;
2144                 } else {
2145                         $edit->timestamp = wfTimestampNow();
2146                 }
2147                 // @note: $cachedEdit is safely not used if the rev ID was referenced in the text
2148                 $edit->revid = $revid;
2149
2150                 if ( $cachedEdit ) {
2151                         $edit->pstContent = $cachedEdit->pstContent;
2152                 } else {
2153                         $edit->pstContent = $content
2154                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2155                                 : null;
2156                 }
2157
2158                 $edit->format = $serialFormat;
2159                 $edit->popts = $this->makeParserOptions( 'canonical' );
2160                 if ( $cachedEdit ) {
2161                         $edit->output = $cachedEdit->output;
2162                 } else {
2163                         if ( $revision ) {
2164                                 // We get here if vary-revision is set. This means that this page references
2165                                 // itself (such as via self-transclusion). In this case, we need to make sure
2166                                 // that any such self-references refer to the newly-saved revision, and not
2167                                 // to the previous one, which could otherwise happen due to replica DB lag.
2168                                 $oldCallback = $edit->popts->getCurrentRevisionCallback();
2169                                 $edit->popts->setCurrentRevisionCallback(
2170                                         function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
2171                                                 if ( $title->equals( $revision->getTitle() ) ) {
2172                                                         return $revision;
2173                                                 } else {
2174                                                         return call_user_func( $oldCallback, $title, $parser );
2175                                                 }
2176                                         }
2177                                 );
2178                         } else {
2179                                 // Try to avoid a second parse if {{REVISIONID}} is used
2180                                 $edit->popts->setSpeculativeRevIdCallback( function () {
2181                                         return 1 + (int)wfGetDB( DB_MASTER )->selectField(
2182                                                 'revision',
2183                                                 'MAX(rev_id)',
2184                                                 [],
2185                                                 __METHOD__
2186                                         );
2187                                 } );
2188                         }
2189                         $edit->output = $edit->pstContent
2190                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2191                                 : null;
2192                 }
2193
2194                 $edit->newContent = $content;
2195                 $edit->oldContent = $this->getContent( Revision::RAW );
2196
2197                 // NOTE: B/C for hooks! don't use these fields!
2198                 $edit->newText = $edit->newContent
2199                         ? ContentHandler::getContentText( $edit->newContent )
2200                         : '';
2201                 $edit->oldText = $edit->oldContent
2202                         ? ContentHandler::getContentText( $edit->oldContent )
2203                         : '';
2204                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2205
2206                 if ( $edit->output ) {
2207                         $edit->output->setCacheTime( wfTimestampNow() );
2208                 }
2209
2210                 // Process cache the result
2211                 $this->mPreparedEdit = $edit;
2212
2213                 return $edit;
2214         }
2215
2216         /**
2217          * Do standard deferred updates after page edit.
2218          * Update links tables, site stats, search index and message cache.
2219          * Purges pages that include this page if the text was changed here.
2220          * Every 100th edit, prune the recent changes table.
2221          *
2222          * @param Revision $revision
2223          * @param User $user User object that did the revision
2224          * @param array $options Array of options, following indexes are used:
2225          * - changed: boolean, whether the revision changed the content (default true)
2226          * - created: boolean, whether the revision created the page (default false)
2227          * - moved: boolean, whether the page was moved (default false)
2228          * - restored: boolean, whether the page was undeleted (default false)
2229          * - oldrevision: Revision object for the pre-update revision (default null)
2230          * - oldcountable: boolean, null, or string 'no-change' (default null):
2231          *   - boolean: whether the page was counted as an article before that
2232          *     revision, only used in changed is true and created is false
2233          *   - null: if created is false, don't update the article count; if created
2234          *     is true, do update the article count
2235          *   - 'no-change': don't update the article count, ever
2236          */
2237         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2238                 global $wgRCWatchCategoryMembership, $wgContLang;
2239
2240                 $options += [
2241                         'changed' => true,
2242                         'created' => false,
2243                         'moved' => false,
2244                         'restored' => false,
2245                         'oldrevision' => null,
2246                         'oldcountable' => null
2247                 ];
2248                 $content = $revision->getContent();
2249
2250                 $logger = LoggerFactory::getInstance( 'SaveParse' );
2251
2252                 // See if the parser output before $revision was inserted is still valid
2253                 $editInfo = false;
2254                 if ( !$this->mPreparedEdit ) {
2255                         $logger->debug( __METHOD__ . ": No prepared edit...\n" );
2256                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2257                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision...\n" );
2258                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision-id' )
2259                         && $this->mPreparedEdit->output->getSpeculativeRevIdUsed() !== $revision->getId()
2260                 ) {
2261                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision-id with wrong ID...\n" );
2262                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-user' ) && !$options['changed'] ) {
2263                         $logger->info( __METHOD__ . ": Prepared edit has vary-user and is null...\n" );
2264                 } else {
2265                         wfDebug( __METHOD__ . ": Using prepared edit...\n" );
2266                         $editInfo = $this->mPreparedEdit;
2267                 }
2268
2269                 if ( !$editInfo ) {
2270                         // Parse the text again if needed. Be careful not to do pre-save transform twice:
2271                         // $text is usually already pre-save transformed once. Avoid using the edit stash
2272                         // as any prepared content from there or in doEditContent() was already rejected.
2273                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user, null, false );
2274                 }
2275
2276                 // Save it to the parser cache.
2277                 // Make sure the cache time matches page_touched to avoid double parsing.
2278                 ParserCache::singleton()->save(
2279                         $editInfo->output, $this, $editInfo->popts,
2280                         $revision->getTimestamp(), $editInfo->revid
2281                 );
2282
2283                 // Update the links tables and other secondary data
2284                 if ( $content ) {
2285                         $recursive = $options['changed']; // bug 50785
2286                         $updates = $content->getSecondaryDataUpdates(
2287                                 $this->getTitle(), null, $recursive, $editInfo->output
2288                         );
2289                         foreach ( $updates as $update ) {
2290                                 if ( $update instanceof LinksUpdate ) {
2291                                         $update->setRevision( $revision );
2292                                         $update->setTriggeringUser( $user );
2293                                 }
2294                                 DeferredUpdates::addUpdate( $update );
2295                         }
2296                         if ( $wgRCWatchCategoryMembership
2297                                 && $this->getContentHandler()->supportsCategories() === true
2298                                 && ( $options['changed'] || $options['created'] )
2299                                 && !$options['restored']
2300                         ) {
2301                                 // Note: jobs are pushed after deferred updates, so the job should be able to see
2302                                 // the recent change entry (also done via deferred updates) and carry over any
2303                                 // bot/deletion/IP flags, ect.
2304                                 JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
2305                                         $this->getTitle(),
2306                                         [
2307                                                 'pageId' => $this->getId(),
2308                                                 'revTimestamp' => $revision->getTimestamp()
2309                                         ]
2310                                 ) );
2311                         }
2312                 }
2313
2314                 Hooks::run( 'ArticleEditUpdates', [ &$this, &$editInfo, $options['changed'] ] );
2315
2316                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$this ] ) ) {
2317                         // Flush old entries from the `recentchanges` table
2318                         if ( mt_rand( 0, 9 ) == 0 ) {
2319                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2320                         }
2321                 }
2322
2323                 if ( !$this->exists() ) {
2324                         return;
2325                 }
2326
2327                 $id = $this->getId();
2328                 $title = $this->mTitle->getPrefixedDBkey();
2329                 $shortTitle = $this->mTitle->getDBkey();
2330
2331                 if ( $options['oldcountable'] === 'no-change' ||
2332                         ( !$options['changed'] && !$options['moved'] )
2333                 ) {
2334                         $good = 0;
2335                 } elseif ( $options['created'] ) {
2336                         $good = (int)$this->isCountable( $editInfo );
2337                 } elseif ( $options['oldcountable'] !== null ) {
2338                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2339                 } else {
2340                         $good = 0;
2341                 }
2342                 $edits = $options['changed'] ? 1 : 0;
2343                 $total = $options['created'] ? 1 : 0;
2344
2345                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2346                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2347
2348                 // If this is another user's talk page, update newtalk.
2349                 // Don't do this if $options['changed'] = false (null-edits) nor if
2350                 // it's a minor edit and the user doesn't want notifications for those.
2351                 if ( $options['changed']
2352                         && $this->mTitle->getNamespace() == NS_USER_TALK
2353                         && $shortTitle != $user->getTitleKey()
2354                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2355                 ) {
2356                         $recipient = User::newFromName( $shortTitle, false );
2357                         if ( !$recipient ) {
2358                                 wfDebug( __METHOD__ . ": invalid username\n" );
2359                         } else {
2360                                 // Allow extensions to prevent user notification
2361                                 // when a new message is added to their talk page
2362                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$this, $recipient ] ) ) {
2363                                         if ( User::isIP( $shortTitle ) ) {
2364                                                 // An anonymous user
2365                                                 $recipient->setNewtalk( true, $revision );
2366                                         } elseif ( $recipient->isLoggedIn() ) {
2367                                                 $recipient->setNewtalk( true, $revision );
2368                                         } else {
2369                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2370                                         }
2371                                 }
2372                         }
2373                 }
2374
2375                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2376                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2377                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2378                         if ( $msgtext === false || $msgtext === null ) {
2379                                 $msgtext = '';
2380                         }
2381
2382                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2383
2384                         if ( $wgContLang->hasVariants() ) {
2385                                 $wgContLang->updateConversionTable( $this->mTitle );
2386                         }
2387                 }
2388
2389                 if ( $options['created'] ) {
2390                         self::onArticleCreate( $this->mTitle );
2391                 } elseif ( $options['changed'] ) { // bug 50785
2392                         self::onArticleEdit( $this->mTitle, $revision );
2393                 }
2394         }
2395
2396         /**
2397          * Edit an article without doing all that other stuff
2398          * The article must already exist; link tables etc
2399          * are not updated, caches are not flushed.
2400          *
2401          * @param Content $content Content submitted
2402          * @param User $user The relevant user
2403          * @param string $comment Comment submitted
2404          * @param bool $minor Whereas it's a minor modification
2405          * @param string $serialFormat Format for storing the content in the database
2406          */
2407         public function doQuickEditContent(
2408                 Content $content, User $user, $comment = '', $minor = false, $serialFormat = null
2409         ) {
2410
2411                 $serialized = $content->serialize( $serialFormat );
2412
2413                 $dbw = wfGetDB( DB_MASTER );
2414                 $revision = new Revision( [
2415                         'title'      => $this->getTitle(), // for determining the default content model
2416                         'page'       => $this->getId(),
2417                         'user_text'  => $user->getName(),
2418                         'user'       => $user->getId(),
2419                         'text'       => $serialized,
2420                         'length'     => $content->getSize(),
2421                         'comment'    => $comment,
2422                         'minor_edit' => $minor ? 1 : 0,
2423                 ] ); // XXX: set the content object?
2424                 $revision->insertOn( $dbw );
2425                 $this->updateRevisionOn( $dbw, $revision );
2426
2427                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
2428
2429         }
2430
2431         /**
2432          * Update the article's restriction field, and leave a log entry.
2433          * This works for protection both existing and non-existing pages.
2434          *
2435          * @param array $limit Set of restriction keys
2436          * @param array $expiry Per restriction type expiration
2437          * @param int &$cascade Set to false if cascading protection isn't allowed.
2438          * @param string $reason
2439          * @param User $user The user updating the restrictions
2440          * @param string|string[] $tags Change tags to add to the pages and protection log entries
2441          *   ($user should be able to add the specified tags before this is called)
2442          * @return Status Status object; if action is taken, $status->value is the log_id of the
2443          *   protection log entry.
2444          */
2445         public function doUpdateRestrictions( array $limit, array $expiry,
2446                 &$cascade, $reason, User $user, $tags = null
2447         ) {
2448                 global $wgCascadingRestrictionLevels, $wgContLang;
2449
2450                 if ( wfReadOnly() ) {
2451                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2452                 }
2453
2454                 $this->loadPageData( 'fromdbmaster' );
2455                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2456                 $id = $this->getId();
2457
2458                 if ( !$cascade ) {
2459                         $cascade = false;
2460                 }
2461
2462                 // Take this opportunity to purge out expired restrictions
2463                 Title::purgeExpiredRestrictions();
2464
2465                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2466                 // we expect a single selection, but the schema allows otherwise.
2467                 $isProtected = false;
2468                 $protect = false;
2469                 $changed = false;
2470
2471                 $dbw = wfGetDB( DB_MASTER );
2472
2473                 foreach ( $restrictionTypes as $action ) {
2474                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2475                                 $expiry[$action] = 'infinity';
2476                         }
2477                         if ( !isset( $limit[$action] ) ) {
2478                                 $limit[$action] = '';
2479                         } elseif ( $limit[$action] != '' ) {
2480                                 $protect = true;
2481                         }
2482
2483                         // Get current restrictions on $action
2484                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2485                         if ( $current != '' ) {
2486                                 $isProtected = true;
2487                         }
2488
2489                         if ( $limit[$action] != $current ) {
2490                                 $changed = true;
2491                         } elseif ( $limit[$action] != '' ) {
2492                                 // Only check expiry change if the action is actually being
2493                                 // protected, since expiry does nothing on an not-protected
2494                                 // action.
2495                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2496                                         $changed = true;
2497                                 }
2498                         }
2499                 }
2500
2501                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2502                         $changed = true;
2503                 }
2504
2505                 // If nothing has changed, do nothing
2506                 if ( !$changed ) {
2507                         return Status::newGood();
2508                 }
2509
2510                 if ( !$protect ) { // No protection at all means unprotection
2511                         $revCommentMsg = 'unprotectedarticle';
2512                         $logAction = 'unprotect';
2513                 } elseif ( $isProtected ) {
2514                         $revCommentMsg = 'modifiedarticleprotection';
2515                         $logAction = 'modify';
2516                 } else {
2517                         $revCommentMsg = 'protectedarticle';
2518                         $logAction = 'protect';
2519                 }
2520
2521                 // Truncate for whole multibyte characters
2522                 $reason = $wgContLang->truncate( $reason, 255 );
2523
2524                 $logRelationsValues = [];
2525                 $logRelationsField = null;
2526                 $logParamsDetails = [];
2527
2528                 // Null revision (used for change tag insertion)
2529                 $nullRevision = null;
2530
2531                 if ( $id ) { // Protection of existing page
2532                         if ( !Hooks::run( 'ArticleProtect', [ &$this, &$user, $limit, $reason ] ) ) {
2533                                 return Status::newGood();
2534                         }
2535
2536                         // Only certain restrictions can cascade...
2537                         $editrestriction = isset( $limit['edit'] )
2538                                 ? [ $limit['edit'] ]
2539                                 : $this->mTitle->getRestrictions( 'edit' );
2540                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2541                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2542                         }
2543                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2544                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2545                         }
2546
2547                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2548                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2549                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2550                         }
2551                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2552                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2553                         }
2554
2555                         // The schema allows multiple restrictions
2556                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2557                                 $cascade = false;
2558                         }
2559
2560                         // insert null revision to identify the page protection change as edit summary
2561                         $latest = $this->getLatest();
2562                         $nullRevision = $this->insertProtectNullRevision(
2563                                 $revCommentMsg,
2564                                 $limit,
2565                                 $expiry,
2566                                 $cascade,
2567                                 $reason,
2568                                 $user
2569                         );
2570
2571                         if ( $nullRevision === null ) {
2572                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2573                         }
2574
2575                         $logRelationsField = 'pr_id';
2576
2577                         // Update restrictions table
2578                         foreach ( $limit as $action => $restrictions ) {
2579                                 $dbw->delete(
2580                                         'page_restrictions',
2581                                         [
2582                                                 'pr_page' => $id,
2583                                                 'pr_type' => $action
2584                                         ],
2585                                         __METHOD__
2586                                 );
2587                                 if ( $restrictions != '' ) {
2588                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2589                                         $dbw->insert(
2590                                                 'page_restrictions',
2591                                                 [
2592                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2593                                                         'pr_page' => $id,
2594                                                         'pr_type' => $action,
2595                                                         'pr_level' => $restrictions,
2596                                                         'pr_cascade' => $cascadeValue,
2597                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2598                                                 ],
2599                                                 __METHOD__
2600                                         );
2601                                         $logRelationsValues[] = $dbw->insertId();
2602                                         $logParamsDetails[] = [
2603                                                 'type' => $action,
2604                                                 'level' => $restrictions,
2605                                                 'expiry' => $expiry[$action],
2606                                                 'cascade' => (bool)$cascadeValue,
2607                                         ];
2608                                 }
2609                         }
2610
2611                         // Clear out legacy restriction fields
2612                         $dbw->update(
2613                                 'page',
2614                                 [ 'page_restrictions' => '' ],
2615                                 [ 'page_id' => $id ],
2616                                 __METHOD__
2617                         );
2618
2619                         Hooks::run( 'NewRevisionFromEditComplete',
2620                                 [ $this, $nullRevision, $latest, $user ] );
2621                         Hooks::run( 'ArticleProtectComplete', [ &$this, &$user, $limit, $reason ] );
2622                 } else { // Protection of non-existing page (also known as "title protection")
2623                         // Cascade protection is meaningless in this case
2624                         $cascade = false;
2625
2626                         if ( $limit['create'] != '' ) {
2627                                 $dbw->replace( 'protected_titles',
2628                                         [ [ 'pt_namespace', 'pt_title' ] ],
2629                                         [
2630                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2631                                                 'pt_title' => $this->mTitle->getDBkey(),
2632                                                 'pt_create_perm' => $limit['create'],
2633                                                 'pt_timestamp' => $dbw->timestamp(),
2634                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2635                                                 'pt_user' => $user->getId(),
2636                                                 'pt_reason' => $reason,
2637                                         ], __METHOD__
2638                                 );
2639                                 $logParamsDetails[] = [
2640                                         'type' => 'create',
2641                                         'level' => $limit['create'],
2642                                         'expiry' => $expiry['create'],
2643                                 ];
2644                         } else {
2645                                 $dbw->delete( 'protected_titles',
2646                                         [
2647                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2648                                                 'pt_title' => $this->mTitle->getDBkey()
2649                                         ], __METHOD__
2650                                 );
2651                         }
2652                 }
2653
2654                 $this->mTitle->flushRestrictions();
2655                 InfoAction::invalidateCache( $this->mTitle );
2656
2657                 if ( $logAction == 'unprotect' ) {
2658                         $params = [];
2659                 } else {
2660                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2661                         $params = [
2662                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2663                                 '5:bool:cascade' => $cascade,
2664                                 'details' => $logParamsDetails, // parameter for localize and api
2665                         ];
2666                 }
2667
2668                 // Update the protection log
2669                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2670                 $logEntry->setTarget( $this->mTitle );
2671                 $logEntry->setComment( $reason );
2672                 $logEntry->setPerformer( $user );
2673                 $logEntry->setParameters( $params );
2674                 if ( !is_null( $nullRevision ) ) {
2675                         $logEntry->setAssociatedRevId( $nullRevision->getId() );
2676                 }
2677                 $logEntry->setTags( $tags );
2678                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2679                         $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
2680                 }
2681                 $logId = $logEntry->insert();
2682                 $logEntry->publish( $logId );
2683
2684                 return Status::newGood( $logId );
2685         }
2686
2687         /**
2688          * Insert a new null revision for this page.
2689          *
2690          * @param string $revCommentMsg Comment message key for the revision
2691          * @param array $limit Set of restriction keys
2692          * @param array $expiry Per restriction type expiration
2693          * @param int $cascade Set to false if cascading protection isn't allowed.
2694          * @param string $reason
2695          * @param User|null $user
2696          * @return Revision|null Null on error
2697          */
2698         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2699                 array $expiry, $cascade, $reason, $user = null
2700         ) {
2701                 global $wgContLang;
2702                 $dbw = wfGetDB( DB_MASTER );
2703
2704                 // Prepare a null revision to be added to the history
2705                 $editComment = $wgContLang->ucfirst(
2706                         wfMessage(
2707                                 $revCommentMsg,
2708                                 $this->mTitle->getPrefixedText()
2709                         )->inContentLanguage()->text()
2710                 );
2711                 if ( $reason ) {
2712                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2713                 }
2714                 $protectDescription = $this->protectDescription( $limit, $expiry );
2715                 if ( $protectDescription ) {
2716                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2717                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2718                                 ->inContentLanguage()->text();
2719                 }
2720                 if ( $cascade ) {
2721                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2722                         $editComment .= wfMessage( 'brackets' )->params(
2723                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2724                         )->inContentLanguage()->text();
2725                 }
2726
2727                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2728                 if ( $nullRev ) {
2729                         $nullRev->insertOn( $dbw );
2730
2731                         // Update page record and touch page
2732                         $oldLatest = $nullRev->getParentId();
2733                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2734                 }
2735
2736                 return $nullRev;
2737         }
2738
2739         /**
2740          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2741          * @return string
2742          */
2743         protected function formatExpiry( $expiry ) {
2744                 global $wgContLang;
2745
2746                 if ( $expiry != 'infinity' ) {
2747                         return wfMessage(
2748                                 'protect-expiring',
2749                                 $wgContLang->timeanddate( $expiry, false, false ),
2750                                 $wgContLang->date( $expiry, false, false ),
2751                                 $wgContLang->time( $expiry, false, false )
2752                         )->inContentLanguage()->text();
2753                 } else {
2754                         return wfMessage( 'protect-expiry-indefinite' )
2755                                 ->inContentLanguage()->text();
2756                 }
2757         }
2758
2759         /**
2760          * Builds the description to serve as comment for the edit.
2761          *
2762          * @param array $limit Set of restriction keys
2763          * @param array $expiry Per restriction type expiration
2764          * @return string
2765          */
2766         public function protectDescription( array $limit, array $expiry ) {
2767                 $protectDescription = '';
2768
2769                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2770                         # $action is one of $wgRestrictionTypes = [ 'create', 'edit', 'move', 'upload' ].
2771                         # All possible message keys are listed here for easier grepping:
2772                         # * restriction-create
2773                         # * restriction-edit
2774                         # * restriction-move
2775                         # * restriction-upload
2776                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2777                         # $restrictions is one of $wgRestrictionLevels = [ '', 'autoconfirmed', 'sysop' ],
2778                         # with '' filtered out. All possible message keys are listed below:
2779                         # * protect-level-autoconfirmed
2780                         # * protect-level-sysop
2781                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
2782                                 ->inContentLanguage()->text();
2783
2784                         $expiryText = $this->formatExpiry( $expiry[$action] );
2785
2786                         if ( $protectDescription !== '' ) {
2787                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2788                         }
2789                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2790                                 ->params( $actionText, $restrictionsText, $expiryText )
2791                                 ->inContentLanguage()->text();
2792                 }
2793
2794                 return $protectDescription;
2795         }
2796
2797         /**
2798          * Builds the description to serve as comment for the log entry.
2799          *
2800          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2801          * protect description text. Keep them in old format to avoid breaking compatibility.
2802          * TODO: Fix protection log to store structured description and format it on-the-fly.
2803          *
2804          * @param array $limit Set of restriction keys
2805          * @param array $expiry Per restriction type expiration
2806          * @return string
2807          */
2808         public function protectDescriptionLog( array $limit, array $expiry ) {
2809                 global $wgContLang;
2810
2811                 $protectDescriptionLog = '';
2812
2813                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2814                         $expiryText = $this->formatExpiry( $expiry[$action] );
2815                         $protectDescriptionLog .= $wgContLang->getDirMark() .
2816                                 "[$action=$restrictions] ($expiryText)";
2817                 }
2818
2819                 return trim( $protectDescriptionLog );
2820         }
2821
2822         /**
2823          * Take an array of page restrictions and flatten it to a string
2824          * suitable for insertion into the page_restrictions field.
2825          *
2826          * @param string[] $limit
2827          *
2828          * @throws MWException
2829          * @return string
2830          */
2831         protected static function flattenRestrictions( $limit ) {
2832                 if ( !is_array( $limit ) ) {
2833                         throw new MWException( __METHOD__ . ' given non-array restriction set' );
2834                 }
2835
2836                 $bits = [];
2837                 ksort( $limit );
2838
2839                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2840                         $bits[] = "$action=$restrictions";
2841                 }
2842
2843                 return implode( ':', $bits );
2844         }
2845
2846         /**
2847          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2848          * backwards compatibility, if you care about error reporting you should use
2849          * doDeleteArticleReal() instead.
2850          *
2851          * Deletes the article with database consistency, writes logs, purges caches
2852          *
2853          * @param string $reason Delete reason for deletion log
2854          * @param bool $suppress Suppress all revisions and log the deletion in
2855          *        the suppression log instead of the deletion log
2856          * @param int $u1 Unused
2857          * @param bool $u2 Unused
2858          * @param array|string &$error Array of errors to append to
2859          * @param User $user The deleting user
2860          * @return bool True if successful
2861          */
2862         public function doDeleteArticle(
2863                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2864         ) {
2865                 $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
2866                 return $status->isGood();
2867         }
2868
2869         /**
2870          * Back-end article deletion
2871          * Deletes the article with database consistency, writes logs, purges caches
2872          *
2873          * @since 1.19
2874          *
2875          * @param string $reason Delete reason for deletion log
2876          * @param bool $suppress Suppress all revisions and log the deletion in
2877          *   the suppression log instead of the deletion log
2878          * @param int $u1 Unused
2879          * @param bool $u2 Unused
2880          * @param array|string &$error Array of errors to append to
2881          * @param User $user The deleting user
2882          * @return Status Status object; if successful, $status->value is the log_id of the
2883          *   deletion log entry. If the page couldn't be deleted because it wasn't
2884          *   found, $status is a non-fatal 'cannotdelete' error
2885          */
2886         public function doDeleteArticleReal(
2887                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2888         ) {
2889                 global $wgUser, $wgContentHandlerUseDB;
2890
2891                 wfDebug( __METHOD__ . "\n" );
2892
2893                 $status = Status::newGood();
2894
2895                 if ( $this->mTitle->getDBkey() === '' ) {
2896                         $status->error( 'cannotdelete',
2897                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2898                         return $status;
2899                 }
2900
2901                 $user = is_null( $user ) ? $wgUser : $user;
2902                 if ( !Hooks::run( 'ArticleDelete',
2903                         [ &$this, &$user, &$reason, &$error, &$status, $suppress ]
2904                 ) ) {
2905                         if ( $status->isOK() ) {
2906                                 // Hook aborted but didn't set a fatal status
2907                                 $status->fatal( 'delete-hook-aborted' );
2908                         }
2909                         return $status;
2910                 }
2911
2912                 $dbw = wfGetDB( DB_MASTER );
2913                 $dbw->startAtomic( __METHOD__ );
2914
2915                 $this->loadPageData( self::READ_LATEST );
2916                 $id = $this->getId();
2917                 // T98706: lock the page from various other updates but avoid using
2918                 // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2919                 // the revisions queries (which also JOIN on user). Only lock the page
2920                 // row and CAS check on page_latest to see if the trx snapshot matches.
2921                 $lockedLatest = $this->lockAndGetLatest();
2922                 if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
2923                         $dbw->endAtomic( __METHOD__ );
2924                         // Page not there or trx snapshot is stale
2925                         $status->error( 'cannotdelete',
2926                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2927                         return $status;
2928                 }
2929
2930                 // Given the lock above, we can be confident in the title and page ID values
2931                 $namespace = $this->getTitle()->getNamespace();
2932                 $dbKey = $this->getTitle()->getDBkey();
2933
2934                 // At this point we are now comitted to returning an OK
2935                 // status unless some DB query error or other exception comes up.
2936                 // This way callers don't have to call rollback() if $status is bad
2937                 // unless they actually try to catch exceptions (which is rare).
2938
2939                 // we need to remember the old content so we can use it to generate all deletion updates.
2940                 try {
2941                         $content = $this->getContent( Revision::RAW );
2942                 } catch ( Exception $ex ) {
2943                         wfLogWarning( __METHOD__ . ': failed to load content during deletion! '
2944                                 . $ex->getMessage() );
2945
2946                         $content = null;
2947                 }
2948
2949                 // Bitfields to further suppress the content
2950                 if ( $suppress ) {
2951                         $bitfield = 0;
2952                         // This should be 15...
2953                         $bitfield |= Revision::DELETED_TEXT;
2954                         $bitfield |= Revision::DELETED_COMMENT;
2955                         $bitfield |= Revision::DELETED_USER;
2956                         $bitfield |= Revision::DELETED_RESTRICTED;
2957                         $deletionFields = [ $dbw->addQuotes( $bitfield ) . ' AS deleted' ];
2958                 } else {
2959                         $deletionFields = [ 'rev_deleted AS deleted' ];
2960                 }
2961
2962                 // For now, shunt the revision data into the archive table.
2963                 // Text is *not* removed from the text table; bulk storage
2964                 // is left intact to avoid breaking block-compression or
2965                 // immutable storage schemes.
2966                 // In the future, we may keep revisions and mark them with
2967                 // the rev_deleted field, which is reserved for this purpose.
2968
2969                 // Get all of the page revisions
2970                 $fields = array_diff( Revision::selectFields(), [ 'rev_deleted' ] );
2971                 $res = $dbw->select(
2972                         'revision',
2973                         array_merge( $fields, $deletionFields ),
2974                         [ 'rev_page' => $id ],
2975                         __METHOD__,
2976                         'FOR UPDATE'
2977                 );
2978                 // Build their equivalent archive rows
2979                 $rowsInsert = [];
2980                 foreach ( $res as $row ) {
2981                         $rowInsert = [
2982                                 'ar_namespace'  => $namespace,
2983                                 'ar_title'      => $dbKey,
2984                                 'ar_comment'    => $row->rev_comment,
2985                                 'ar_user'       => $row->rev_user,
2986                                 'ar_user_text'  => $row->rev_user_text,
2987                                 'ar_timestamp'  => $row->rev_timestamp,
2988                                 'ar_minor_edit' => $row->rev_minor_edit,
2989                                 'ar_rev_id'     => $row->rev_id,
2990                                 'ar_parent_id'  => $row->rev_parent_id,
2991                                 'ar_text_id'    => $row->rev_text_id,
2992                                 'ar_text'       => '',
2993                                 'ar_flags'      => '',
2994                                 'ar_len'        => $row->rev_len,
2995                                 'ar_page_id'    => $id,
2996                                 'ar_deleted'    => $row->deleted,
2997                                 'ar_sha1'       => $row->rev_sha1,
2998                         ];
2999                         if ( $wgContentHandlerUseDB ) {
3000                                 $rowInsert['ar_content_model'] = $row->rev_content_model;
3001                                 $rowInsert['ar_content_format'] = $row->rev_content_format;
3002                         }
3003                         $rowsInsert[] = $rowInsert;
3004                 }
3005                 // Copy them into the archive table
3006                 $dbw->insert( 'archive', $rowsInsert, __METHOD__ );
3007                 // Save this so we can pass it to the ArticleDeleteComplete hook.
3008                 $archivedRevisionCount = $dbw->affectedRows();
3009
3010                 // Clone the title and wikiPage, so we have the information we need when
3011                 // we log and run the ArticleDeleteComplete hook.
3012                 $logTitle = clone $this->mTitle;
3013                 $wikiPageBeforeDelete = clone $this;
3014
3015                 // Now that it's safely backed up, delete it
3016                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
3017
3018                 if ( !$dbw->cascadingDeletes() ) {
3019                         $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
3020                 }
3021
3022                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
3023                 $logtype = $suppress ? 'suppress' : 'delete';
3024
3025                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
3026                 $logEntry->setPerformer( $user );
3027                 $logEntry->setTarget( $logTitle );
3028                 $logEntry->setComment( $reason );
3029                 $logid = $logEntry->insert();
3030
3031                 $dbw->onTransactionPreCommitOrIdle( function () use ( $dbw, $logEntry, $logid ) {
3032                         // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
3033                         $logEntry->publish( $logid );
3034                 } );
3035
3036                 $dbw->endAtomic( __METHOD__ );
3037
3038                 $this->doDeleteUpdates( $id, $content );
3039
3040                 Hooks::run( 'ArticleDeleteComplete', [
3041                         &$wikiPageBeforeDelete,
3042                         &$user,
3043                         $reason,
3044                         $id,
3045                         $content,
3046                         $logEntry,
3047                         $archivedRevisionCount
3048                 ] );
3049                 $status->value = $logid;
3050
3051                 // Show log excerpt on 404 pages rather than just a link
3052                 $cache = ObjectCache::getMainStashInstance();
3053                 $key = wfMemcKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
3054                 $cache->set( $key, 1, $cache::TTL_DAY );
3055
3056                 return $status;
3057         }
3058
3059         /**
3060          * Lock the page row for this title+id and return page_latest (or 0)
3061          *
3062          * @return integer Returns 0 if no row was found with this title+id
3063          * @since 1.27
3064          */
3065         public function lockAndGetLatest() {
3066                 return (int)wfGetDB( DB_MASTER )->selectField(
3067                         'page',
3068                         'page_latest',
3069                         [
3070                                 'page_id' => $this->getId(),
3071                                 // Typically page_id is enough, but some code might try to do
3072                                 // updates assuming the title is the same, so verify that
3073                                 'page_namespace' => $this->getTitle()->getNamespace(),
3074                                 'page_title' => $this->getTitle()->getDBkey()
3075                         ],
3076                         __METHOD__,
3077                         [ 'FOR UPDATE' ]
3078                 );
3079         }
3080
3081         /**
3082          * Do some database updates after deletion
3083          *
3084          * @param int $id The page_id value of the page being deleted
3085          * @param Content $content Optional page content to be used when determining
3086          *   the required updates. This may be needed because $this->getContent()
3087          *   may already return null when the page proper was deleted.
3088          */
3089         public function doDeleteUpdates( $id, Content $content = null ) {
3090                 try {
3091                         $countable = $this->isCountable();
3092                 } catch ( Exception $ex ) {
3093                         // fallback for deleting broken pages for which we cannot load the content for
3094                         // some reason. Note that doDeleteArticleReal() already logged this problem.
3095                         $countable = false;
3096                 }
3097
3098                 // Update site status
3099                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$countable, -1 ) );
3100
3101                 // Delete pagelinks, update secondary indexes, etc
3102                 $updates = $this->getDeletionUpdates( $content );
3103                 foreach ( $updates as $update ) {
3104                         DeferredUpdates::addUpdate( $update );
3105                 }
3106
3107                 // Reparse any pages transcluding this page
3108                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
3109
3110                 // Reparse any pages including this image
3111                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
3112                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
3113                 }
3114
3115                 // Clear caches
3116                 WikiPage::onArticleDelete( $this->mTitle );
3117
3118                 // Reset this object and the Title object
3119                 $this->loadFromRow( false, self::READ_LATEST );
3120
3121                 // Search engine
3122                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
3123         }
3124
3125         /**
3126          * Roll back the most recent consecutive set of edits to a page
3127          * from the same user; fails if there are no eligible edits to
3128          * roll back to, e.g. user is the sole contributor. This function
3129          * performs permissions checks on $user, then calls commitRollback()
3130          * to do the dirty work
3131          *
3132          * @todo Separate the business/permission stuff out from backend code
3133          * @todo Remove $token parameter. Already verified by RollbackAction and ApiRollback.
3134          *
3135          * @param string $fromP Name of the user whose edits to rollback.
3136          * @param string $summary Custom summary. Set to default summary if empty.
3137          * @param string $token Rollback token.
3138          * @param bool $bot If true, mark all reverted edits as bot.
3139          *
3140          * @param array $resultDetails Array contains result-specific array of additional values
3141          *    'alreadyrolled' : 'current' (rev)
3142          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3143          *
3144          * @param User $user The user performing the rollback
3145          * @param array|null $tags Change tags to apply to the rollback
3146          * Callers are responsible for permission checks
3147          * (with ChangeTags::canAddTagsAccompanyingChange)
3148          *
3149          * @return array Array of errors, each error formatted as
3150          *   array(messagekey, param1, param2, ...).
3151          * On success, the array is empty.  This array can also be passed to
3152          * OutputPage::showPermissionsErrorPage().
3153          */
3154         public function doRollback(
3155                 $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
3156         ) {
3157                 $resultDetails = null;
3158
3159                 // Check permissions
3160                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
3161                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
3162                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3163
3164                 if ( !$user->matchEditToken( $token, 'rollback' ) ) {
3165                         $errors[] = [ 'sessionfailure' ];
3166                 }
3167
3168                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
3169                         $errors[] = [ 'actionthrottledtext' ];
3170                 }
3171
3172                 // If there were errors, bail out now
3173                 if ( !empty( $errors ) ) {
3174                         return $errors;
3175                 }
3176
3177                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
3178         }
3179
3180         /**
3181          * Backend implementation of doRollback(), please refer there for parameter
3182          * and return value documentation
3183          *
3184          * NOTE: This function does NOT check ANY permissions, it just commits the
3185          * rollback to the DB. Therefore, you should only call this function direct-
3186          * ly if you want to use custom permissions checks. If you don't, use
3187          * doRollback() instead.
3188          * @param string $fromP Name of the user whose edits to rollback.
3189          * @param string $summary Custom summary. Set to default summary if empty.
3190          * @param bool $bot If true, mark all reverted edits as bot.
3191          *
3192          * @param array $resultDetails Contains result-specific array of additional values
3193          * @param User $guser The user performing the rollback
3194          * @param array|null $tags Change tags to apply to the rollback
3195          * Callers are responsible for permission checks
3196          * (with ChangeTags::canAddTagsAccompanyingChange)
3197          *
3198          * @return array
3199          */
3200         public function commitRollback( $fromP, $summary, $bot,
3201                 &$resultDetails, User $guser, $tags = null
3202         ) {
3203                 global $wgUseRCPatrol, $wgContLang;
3204
3205                 $dbw = wfGetDB( DB_MASTER );
3206
3207                 if ( wfReadOnly() ) {
3208                         return [ [ 'readonlytext' ] ];
3209                 }
3210
3211                 // Get the last editor
3212                 $current = $this->getRevision();
3213                 if ( is_null( $current ) ) {
3214                         // Something wrong... no page?
3215                         return [ [ 'notanarticle' ] ];
3216                 }
3217
3218                 $from = str_replace( '_', ' ', $fromP );
3219                 // User name given should match up with the top revision.
3220                 // If the user was deleted then $from should be empty.
3221                 if ( $from != $current->getUserText() ) {
3222                         $resultDetails = [ 'current' => $current ];
3223                         return [ [ 'alreadyrolled',
3224                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3225                                 htmlspecialchars( $fromP ),
3226                                 htmlspecialchars( $current->getUserText() )
3227                         ] ];
3228                 }
3229
3230                 // Get the last edit not by this person...
3231                 // Note: these may not be public values
3232                 $user = intval( $current->getUser( Revision::RAW ) );
3233                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3234                 $s = $dbw->selectRow( 'revision',
3235                         [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
3236                         [ 'rev_page' => $current->getPage(),
3237                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3238                         ], __METHOD__,
3239                         [ 'USE INDEX' => 'page_timestamp',
3240                                 'ORDER BY' => 'rev_timestamp DESC' ]
3241                         );
3242                 if ( $s === false ) {
3243                         // No one else ever edited this page
3244                         return [ [ 'cantrollback' ] ];
3245                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3246                         || $s->rev_deleted & Revision::DELETED_USER
3247                 ) {
3248                         // Only admins can see this text
3249                         return [ [ 'notvisiblerev' ] ];
3250                 }
3251
3252                 // Generate the edit summary if necessary
3253                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3254                 if ( empty( $summary ) ) {
3255                         if ( $from == '' ) { // no public user name
3256                                 $summary = wfMessage( 'revertpage-nouser' );
3257                         } else {
3258                                 $summary = wfMessage( 'revertpage' );
3259                         }
3260                 }
3261
3262                 // Allow the custom summary to use the same args as the default message
3263                 $args = [
3264                         $target->getUserText(), $from, $s->rev_id,
3265                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3266                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3267                 ];
3268                 if ( $summary instanceof Message ) {
3269                         $summary = $summary->params( $args )->inContentLanguage()->text();
3270                 } else {
3271                         $summary = wfMsgReplaceArgs( $summary, $args );
3272                 }
3273
3274                 // Trim spaces on user supplied text
3275                 $summary = trim( $summary );
3276
3277                 // Truncate for whole multibyte characters.
3278                 $summary = $wgContLang->truncate( $summary, 255 );
3279
3280                 // Save
3281                 $flags = EDIT_UPDATE | EDIT_INTERNAL;
3282
3283                 if ( $guser->isAllowed( 'minoredit' ) ) {
3284                         $flags |= EDIT_MINOR;
3285                 }
3286
3287                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3288                         $flags |= EDIT_FORCE_BOT;
3289                 }
3290
3291                 $targetContent = $target->getContent();
3292                 $changingContentModel = $targetContent->getModel() !== $current->getContentModel();
3293
3294                 // Actually store the edit
3295                 $status = $this->doEditContent(
3296                         $targetContent,
3297                         $summary,
3298                         $flags,
3299                         $target->getId(),
3300                         $guser,
3301                         null,
3302                         $tags
3303                 );
3304
3305                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3306                 // This is done even on edit failure to have patrolling in that case (bug 62157).
3307                 $set = [];
3308                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3309                         // Mark all reverted edits as bot
3310                         $set['rc_bot'] = 1;
3311                 }
3312
3313                 if ( $wgUseRCPatrol ) {
3314                         // Mark all reverted edits as patrolled
3315                         $set['rc_patrolled'] = 1;
3316                 }
3317
3318                 if ( count( $set ) ) {
3319                         $dbw->update( 'recentchanges', $set,
3320                                 [ /* WHERE */
3321                                         'rc_cur_id' => $current->getPage(),
3322                                         'rc_user_text' => $current->getUserText(),
3323                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3324                                 ],
3325                                 __METHOD__
3326                         );
3327                 }
3328
3329                 if ( !$status->isOK() ) {
3330                         return $status->getErrorsArray();
3331                 }
3332
3333                 // raise error, when the edit is an edit without a new version
3334                 $statusRev = isset( $status->value['revision'] )
3335                         ? $status->value['revision']
3336                         : null;
3337                 if ( !( $statusRev instanceof Revision ) ) {
3338                         $resultDetails = [ 'current' => $current ];
3339                         return [ [ 'alreadyrolled',
3340                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3341                                         htmlspecialchars( $fromP ),
3342                                         htmlspecialchars( $current->getUserText() )
3343                         ] ];
3344                 }
3345
3346                 if ( $changingContentModel ) {
3347                         // If the content model changed during the rollback,
3348                         // make sure it gets logged to Special:Log/contentmodel
3349                         $log = new ManualLogEntry( 'contentmodel', 'change' );
3350                         $log->setPerformer( $guser );
3351                         $log->setTarget( $this->mTitle );
3352                         $log->setComment( $summary );
3353                         $log->setParameters( [
3354                                 '4::oldmodel' => $current->getContentModel(),
3355                                 '5::newmodel' => $targetContent->getModel(),
3356                         ] );
3357
3358                         $logId = $log->insert( $dbw );
3359                         $log->publish( $logId );
3360                 }
3361
3362                 $revId = $statusRev->getId();
3363
3364                 Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );
3365
3366                 $resultDetails = [
3367                         'summary' => $summary,
3368                         'current' => $current,
3369                         'target' => $target,
3370                         'newid' => $revId
3371                 ];
3372
3373                 return [];
3374         }
3375
3376         /**
3377          * The onArticle*() functions are supposed to be a kind of hooks
3378          * which should be called whenever any of the specified actions
3379          * are done.
3380          *
3381          * This is a good place to put code to clear caches, for instance.
3382          *
3383          * This is called on page move and undelete, as well as edit
3384          *
3385          * @param Title $title
3386          */
3387         public static function onArticleCreate( Title $title ) {
3388                 // Update existence markers on article/talk tabs...
3389                 $other = $title->getOtherPage();
3390
3391                 $other->purgeSquid();
3392
3393                 $title->touchLinks();
3394                 $title->purgeSquid();
3395                 $title->deleteTitleProtection();
3396
3397                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3398
3399                 if ( $title->getNamespace() == NS_CATEGORY ) {
3400                         // Load the Category object, which will schedule a job to create
3401                         // the category table row if necessary. Checking a replica DB is ok
3402                         // here, in the worst case it'll run an unnecessary recount job on
3403                         // a category that probably doesn't have many members.
3404                         Category::newFromTitle( $title )->getID();
3405                 }
3406         }
3407
3408         /**
3409          * Clears caches when article is deleted
3410          *
3411          * @param Title $title
3412          */
3413         public static function onArticleDelete( Title $title ) {
3414                 global $wgContLang;
3415
3416                 // Update existence markers on article/talk tabs...
3417                 $other = $title->getOtherPage();
3418
3419                 $other->purgeSquid();
3420
3421                 $title->touchLinks();
3422                 $title->purgeSquid();
3423
3424                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3425
3426                 // File cache
3427                 HTMLFileCache::clearFileCache( $title );
3428                 InfoAction::invalidateCache( $title );
3429
3430                 // Messages
3431                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3432                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3433
3434                         if ( $wgContLang->hasVariants() ) {
3435                                 $wgContLang->updateConversionTable( $title );
3436                         }
3437                 }
3438
3439                 // Images
3440                 if ( $title->getNamespace() == NS_FILE ) {
3441                         DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
3442                 }
3443
3444                 // User talk pages
3445                 if ( $title->getNamespace() == NS_USER_TALK ) {
3446                         $user = User::newFromName( $title->getText(), false );
3447                         if ( $user ) {
3448                                 $user->setNewtalk( false );
3449                         }
3450                 }
3451
3452                 // Image redirects
3453                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3454         }
3455
3456         /**
3457          * Purge caches on page update etc
3458          *
3459          * @param Title $title
3460          * @param Revision|null $revision Revision that was just saved, may be null
3461          */
3462         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3463                 // Invalidate caches of articles which include this page
3464                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3465
3466                 // Invalidate the caches of all pages which redirect here
3467                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
3468
3469                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3470
3471                 // Purge CDN for this page only
3472                 $title->purgeSquid();
3473                 // Clear file cache for this page only
3474                 HTMLFileCache::clearFileCache( $title );
3475
3476                 $revid = $revision ? $revision->getId() : null;
3477                 DeferredUpdates::addCallableUpdate( function() use ( $title, $revid ) {
3478                         InfoAction::invalidateCache( $title, $revid );
3479                 } );
3480         }
3481
3482         /**#@-*/
3483
3484         /**
3485          * Returns a list of categories this page is a member of.
3486          * Results will include hidden categories
3487          *
3488          * @return TitleArray
3489          */
3490         public function getCategories() {
3491                 $id = $this->getId();
3492                 if ( $id == 0 ) {
3493                         return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
3494                 }
3495
3496                 $dbr = wfGetDB( DB_REPLICA );
3497                 $res = $dbr->select( 'categorylinks',
3498                         [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
3499                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3500                         // as not being aliases, and NS_CATEGORY is numeric
3501                         [ 'cl_from' => $id ],
3502                         __METHOD__ );
3503
3504                 return TitleArray::newFromResult( $res );
3505         }
3506
3507         /**
3508          * Returns a list of hidden categories this page is a member of.
3509          * Uses the page_props and categorylinks tables.
3510          *
3511          * @return array Array of Title objects
3512          */
3513         public function getHiddenCategories() {
3514                 $result = [];
3515                 $id = $this->getId();
3516
3517                 if ( $id == 0 ) {
3518                         return [];
3519                 }
3520
3521                 $dbr = wfGetDB( DB_REPLICA );
3522                 $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
3523                         [ 'cl_to' ],
3524                         [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3525                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
3526                         __METHOD__ );
3527
3528                 if ( $res !== false ) {
3529                         foreach ( $res as $row ) {
3530                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3531                         }
3532                 }
3533
3534                 return $result;
3535         }
3536
3537         /**
3538          * Return an applicable autosummary if one exists for the given edit.
3539          * @param string|null $oldtext The previous text of the page.
3540          * @param string|null $newtext The submitted text of the page.
3541          * @param int $flags Bitmask: a bitmask of flags submitted for the edit.
3542          * @return string An appropriate autosummary, or an empty string.
3543          *
3544          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3545          */
3546         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3547                 // NOTE: stub for backwards-compatibility. assumes the given text is
3548                 // wikitext. will break horribly if it isn't.
3549
3550                 ContentHandler::deprecated( __METHOD__, '1.21' );
3551
3552                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3553                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3554                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3555
3556                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3557         }
3558
3559         /**
3560          * Auto-generates a deletion reason
3561          *
3562          * @param bool &$hasHistory Whether the page has a history
3563          * @return string|bool String containing deletion reason or empty string, or boolean false
3564          *    if no revision occurred
3565          */
3566         public function getAutoDeleteReason( &$hasHistory ) {
3567                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3568         }
3569
3570         /**
3571          * Update all the appropriate counts in the category table, given that
3572          * we've added the categories $added and deleted the categories $deleted.
3573          *
3574          * @param array $added The names of categories that were added
3575          * @param array $deleted The names of categories that were deleted
3576          * @param integer $id Page ID (this should be the original deleted page ID)
3577          */
3578         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
3579                 $id = $id ?: $this->getId();
3580                 $dbw = wfGetDB( DB_MASTER );
3581                 $method = __METHOD__;
3582                 // Do this at the end of the commit to reduce lock wait timeouts
3583                 $dbw->onTransactionPreCommitOrIdle(
3584                         function () use ( $dbw, $added, $deleted, $id, $method ) {
3585                                 $ns = $this->getTitle()->getNamespace();
3586
3587                                 $addFields = [ 'cat_pages = cat_pages + 1' ];
3588                                 $removeFields = [ 'cat_pages = cat_pages - 1' ];
3589                                 if ( $ns == NS_CATEGORY ) {
3590                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3591                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3592                                 } elseif ( $ns == NS_FILE ) {
3593                                         $addFields[] = 'cat_files = cat_files + 1';
3594                                         $removeFields[] = 'cat_files = cat_files - 1';
3595                                 }
3596
3597                                 if ( count( $added ) ) {
3598                                         $existingAdded = $dbw->selectFieldValues(
3599                                                 'category',
3600                                                 'cat_title',
3601                                                 [ 'cat_title' => $added ],
3602                                                 $method
3603                                         );
3604
3605                                         // For category rows that already exist, do a plain
3606                                         // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
3607                                         // to avoid creating gaps in the cat_id sequence.
3608                                         if ( count( $existingAdded ) ) {
3609                                                 $dbw->update(
3610                                                         'category',
3611                                                         $addFields,
3612                                                         [ 'cat_title' => $existingAdded ],
3613                                                         $method
3614                                                 );
3615                                         }
3616
3617                                         $missingAdded = array_diff( $added, $existingAdded );
3618                                         if ( count( $missingAdded ) ) {
3619                                                 $insertRows = [];
3620                                                 foreach ( $missingAdded as $cat ) {
3621                                                         $insertRows[] = [
3622                                                                 'cat_title'   => $cat,
3623                                                                 'cat_pages'   => 1,
3624                                                                 'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3625                                                                 'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3626                                                         ];
3627                                                 }
3628                                                 $dbw->upsert(
3629                                                         'category',
3630                                                         $insertRows,
3631                                                         [ 'cat_title' ],
3632                                                         $addFields,
3633                                                         $method
3634                                                 );
3635                                         }
3636                                 }
3637
3638                                 if ( count( $deleted ) ) {
3639                                         $dbw->update(
3640                                                 'category',
3641                                                 $removeFields,
3642                                                 [ 'cat_title' => $deleted ],
3643                                                 $method
3644                                         );
3645                                 }
3646
3647                                 foreach ( $added as $catName ) {
3648                                         $cat = Category::newFromName( $catName );
3649                                         Hooks::run( 'CategoryAfterPageAdded', [ $cat, $this ] );
3650                                 }
3651
3652                                 foreach ( $deleted as $catName ) {
3653                                         $cat = Category::newFromName( $catName );
3654                                         Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $this, $id ] );
3655                                 }
3656
3657                                 // Refresh counts on categories that should be empty now, to
3658                                 // trigger possible deletion. Check master for the most
3659                                 // up-to-date cat_pages.
3660                                 if ( count( $deleted ) ) {
3661                                         $rows = $dbw->select(
3662                                                 'category',
3663                                                 [ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ],
3664                                                 [ 'cat_title' => $deleted, 'cat_pages <= 0' ],
3665                                                 $method
3666                                         );
3667                                         foreach ( $rows as $row ) {
3668                                                 $cat = Category::newFromRow( $row );
3669                                                 $cat->refreshCounts();
3670                                         }
3671                                 }
3672                         }
3673                 );
3674         }
3675
3676         /**
3677          * Opportunistically enqueue link update jobs given fresh parser output if useful
3678          *
3679          * @param ParserOutput $parserOutput Current version page output
3680          * @since 1.25
3681          */
3682         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3683                 if ( wfReadOnly() ) {
3684                         return;
3685                 }
3686
3687                 if ( !Hooks::run( 'OpportunisticLinksUpdate',
3688                         [ $this, $this->mTitle, $parserOutput ]
3689                 ) ) {
3690                         return;
3691                 }
3692
3693                 $config = RequestContext::getMain()->getConfig();
3694
3695                 $params = [
3696                         'isOpportunistic' => true,
3697                         'rootJobTimestamp' => $parserOutput->getCacheTime()
3698                 ];
3699
3700                 if ( $this->mTitle->areRestrictionsCascading() ) {
3701                         // If the page is cascade protecting, the links should really be up-to-date
3702                         JobQueueGroup::singleton()->lazyPush(
3703                                 RefreshLinksJob::newPrioritized( $this->mTitle, $params )
3704                         );
3705                 } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
3706                         // Assume the output contains "dynamic" time/random based magic words.
3707                         // Only update pages that expired due to dynamic content and NOT due to edits
3708                         // to referenced templates/files. When the cache expires due to dynamic content,
3709                         // page_touched is unchanged. We want to avoid triggering redundant jobs due to
3710                         // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
3711                         // template/file edit already triggered recursive RefreshLinksJob jobs.
3712                         if ( $this->getLinksTimestamp() > $this->getTouched() ) {
3713                                 // If a page is uncacheable, do not keep spamming a job for it.
3714                                 // Although it would be de-duplicated, it would still waste I/O.
3715                                 $cache = ObjectCache::getLocalClusterInstance();
3716                                 $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
3717                                 $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
3718                                 if ( $cache->add( $key, time(), $ttl ) ) {
3719                                         JobQueueGroup::singleton()->lazyPush(
3720                                                 RefreshLinksJob::newDynamic( $this->mTitle, $params )
3721                                         );
3722                                 }
3723                         }
3724                 }
3725         }
3726
3727         /**
3728          * Returns a list of updates to be performed when this page is deleted. The
3729          * updates should remove any information about this page from secondary data
3730          * stores such as links tables.
3731          *
3732          * @param Content|null $content Optional Content object for determining the
3733          *   necessary updates.
3734          * @return DataUpdate[]
3735          */
3736         public function getDeletionUpdates( Content $content = null ) {
3737                 if ( !$content ) {
3738                         // load content object, which may be used to determine the necessary updates.
3739                         // XXX: the content may not be needed to determine the updates.
3740                         try {
3741                                 $content = $this->getContent( Revision::RAW );
3742                         } catch ( Exception $ex ) {
3743                                 // If we can't load the content, something is wrong. Perhaps that's why
3744                                 // the user is trying to delete the page, so let's not fail in that case.
3745                                 // Note that doDeleteArticleReal() will already have logged an issue with
3746                                 // loading the content.
3747                         }
3748                 }
3749
3750                 if ( !$content ) {
3751                         $updates = [];
3752                 } else {
3753                         $updates = $content->getDeletionUpdates( $this );
3754                 }
3755
3756                 Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
3757                 return $updates;
3758         }
3759
3760         /**
3761          * Whether this content displayed on this page
3762          * comes from the local database
3763          *
3764          * @since 1.28
3765          * @return bool
3766          */
3767         public function isLocal() {
3768                 return true;
3769         }
3770 }