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->exists() || $this->mTitle->isAlwaysKnown();
 469         }
 470
 471         /**
 472          * Tests if the article content represents a redirect
 473          *
 474          * @return bool
 475          */
 476         public function isRedirect() {
 477                 if ( !$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                         // look at the revision's actual content model
 497                         $rev = $this->getRevision();
 498
 499                         if ( $rev !== null ) {
 500                                 return $rev->getContentModel();
 501                         } else {
 502                                 $title = $this->mTitle->getPrefixedDBkey();
 503                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 504                         }
 505                 }
 506
 507                 // use the default model for this page
 508                 return $this->mTitle->getContentModel();
 509         }
 510
 511         /**
 512          * Loads page_touched and returns a value indicating if it should be used
 513          * @return bool True if this page exists and is not a redirect
 514          */
 515         public function checkTouched() {
 516                 if ( !$this->mDataLoaded ) {
 517                         $this->loadPageData();
 518                 }
 519                 return ( $this->mId && !$this->mIsRedirect );
 520         }
 521
 522         /**
 523          * Get the page_touched field
 524          * @return string Containing GMT timestamp
 525          */
 526         public function getTouched() {
 527                 if ( !$this->mDataLoaded ) {
 528                         $this->loadPageData();
 529                 }
 530                 return $this->mTouched;
 531         }
 532
 533         /**
 534          * Get the page_links_updated field
 535          * @return string|null Containing GMT timestamp
 536          */
 537         public function getLinksTimestamp() {
 538                 if ( !$this->mDataLoaded ) {
 539                         $this->loadPageData();
 540                 }
 541                 return $this->mLinksUpdated;
 542         }
 543
 544         /**
 545          * Get the page_latest field
 546          * @return int The rev_id of current revision
 547          */
 548         public function getLatest() {
 549                 if ( !$this->mDataLoaded ) {
 550                         $this->loadPageData();
 551                 }
 552                 return (int)$this->mLatest;
 553         }
 554
 555         /**
 556          * Get the Revision object of the oldest revision
 557          * @return Revision|null
 558          */
 559         public function getOldestRevision() {
 560
 561                 // Try using the replica DB first, then try the master
 562                 $continue = 2;
 563                 $db = wfGetDB( DB_REPLICA );
 564                 $revSelectFields = Revision::selectFields();
 565
 566                 $row = null;
 567                 while ( $continue ) {
 568                         $row = $db->selectRow(
 569                                 [ 'page', 'revision' ],
 570                                 $revSelectFields,
 571                                 [
 572                                         'page_namespace' => $this->mTitle->getNamespace(),
 573                                         'page_title' => $this->mTitle->getDBkey(),
 574                                         'rev_page = page_id'
 575                                 ],
 576                                 __METHOD__,
 577                                 [
 578                                         'ORDER BY' => 'rev_timestamp ASC'
 579                                 ]
 580                         );
 581
 582                         if ( $row ) {
 583                                 $continue = 0;
 584                         } else {
 585                                 $db = wfGetDB( DB_MASTER );
 586                                 $continue--;
 587                         }
 588                 }
 589
 590                 return $row ? Revision::newFromRow( $row ) : null;
 591         }
 592
 593         /**
 594          * Loads everything except the text
 595          * This isn't necessary for all uses, so it's only done if needed.
 596          */
 597         protected function loadLastEdit() {
 598                 if ( $this->mLastRevision !== null ) {
 599                         return; // already loaded
 600                 }
 601
 602                 $latest = $this->getLatest();
 603                 if ( !$latest ) {
 604                         return; // page doesn't exist or is missing page_latest info
 605                 }
 606
 607                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 608                         // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always
 609                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 610                         // transactions, where S1 normally only sees changes committed before the first S1
 611                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 612                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 613                         // happened after the first S1 SELECT.
 614                         // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
 615                         $flags = Revision::READ_LOCKING;
 616                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 617                         // Bug T93976: if page_latest was loaded from the master, fetch the
 618                         // revision from there as well, as it may not exist yet on a replica DB.
 619                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 620                         $flags = Revision::READ_LATEST;
 621                 } else {
 622                         $flags = 0;
 623                 }
 624                 $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 625                 if ( $revision ) { // sanity
 626                         $this->setLastEdit( $revision );
 627                 }
 628         }
 629
 630         /**
 631          * Set the latest revision
 632          * @param Revision $revision
 633          */
 634         protected function setLastEdit( Revision $revision ) {
 635                 $this->mLastRevision = $revision;
 636                 $this->mTimestamp = $revision->getTimestamp();
 637         }
 638
 639         /**
 640          * Get the latest revision
 641          * @return Revision|null
 642          */
 643         public function getRevision() {
 644                 $this->loadLastEdit();
 645                 if ( $this->mLastRevision ) {
 646                         return $this->mLastRevision;
 647                 }
 648                 return null;
 649         }
 650
 651         /**
 652          * Get the content of the current revision. No side-effects...
 653          *
 654          * @param int $audience One of:
 655          *   Revision::FOR_PUBLIC       to be displayed to all users
 656          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 657          *   Revision::RAW              get the text regardless of permissions
 658          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 659          *   to the $audience parameter
 660          * @return Content|null The content of the current revision
 661          *
 662          * @since 1.21
 663          */
 664         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 665                 $this->loadLastEdit();
 666                 if ( $this->mLastRevision ) {
 667                         return $this->mLastRevision->getContent( $audience, $user );
 668                 }
 669                 return null;
 670         }
 671
 672         /**
 673          * Get the text of the current revision. No side-effects...
 674          *
 675          * @param int $audience One of:
 676          *   Revision::FOR_PUBLIC       to be displayed to all users
 677          *   Revision::FOR_THIS_USER    to be displayed to the given user
 678          *   Revision::RAW              get the text regardless of permissions
 679          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 680          *   to the $audience parameter
 681          * @return string|bool The text of the current revision
 682          * @deprecated since 1.21, getContent() should be used instead.
 683          */
 684         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 685                 ContentHandler::deprecated( __METHOD__, '1.21' );
 686
 687                 $this->loadLastEdit();
 688                 if ( $this->mLastRevision ) {
 689                         return $this->mLastRevision->getText( $audience, $user );
 690                 }
 691                 return false;
 692         }
 693
 694         /**
 695          * @return string MW timestamp of last article revision
 696          */
 697         public function getTimestamp() {
 698                 // Check if the field has been filled by WikiPage::setTimestamp()
 699                 if ( !$this->mTimestamp ) {
 700                         $this->loadLastEdit();
 701                 }
 702
 703                 return wfTimestamp( TS_MW, $this->mTimestamp );
 704         }
 705
 706         /**
 707          * Set the page timestamp (use only to avoid DB queries)
 708          * @param string $ts MW timestamp of last article revision
 709          * @return void
 710          */
 711         public function setTimestamp( $ts ) {
 712                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 713         }
 714
 715         /**
 716          * @param int $audience One of:
 717          *   Revision::FOR_PUBLIC       to be displayed to all users
 718          *   Revision::FOR_THIS_USER    to be displayed to the given user
 719          *   Revision::RAW              get the text regardless of permissions
 720          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 721          *   to the $audience parameter
 722          * @return int User ID for the user that made the last article revision
 723          */
 724         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 725                 $this->loadLastEdit();
 726                 if ( $this->mLastRevision ) {
 727                         return $this->mLastRevision->getUser( $audience, $user );
 728                 } else {
 729                         return -1;
 730                 }
 731         }
 732
 733         /**
 734          * Get the User object of the user who created the page
 735          * @param int $audience One of:
 736          *   Revision::FOR_PUBLIC       to be displayed to all users
 737          *   Revision::FOR_THIS_USER    to be displayed to the given user
 738          *   Revision::RAW              get the text regardless of permissions
 739          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 740          *   to the $audience parameter
 741          * @return User|null
 742          */
 743         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 744                 $revision = $this->getOldestRevision();
 745                 if ( $revision ) {
 746                         $userName = $revision->getUserText( $audience, $user );
 747                         return User::newFromName( $userName, false );
 748                 } else {
 749                         return null;
 750                 }
 751         }
 752
 753         /**
 754          * @param int $audience One of:
 755          *   Revision::FOR_PUBLIC       to be displayed to all users
 756          *   Revision::FOR_THIS_USER    to be displayed to the given user
 757          *   Revision::RAW              get the text regardless of permissions
 758          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 759          *   to the $audience parameter
 760          * @return string Username of the user that made the last article revision
 761          */
 762         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 763                 $this->loadLastEdit();
 764                 if ( $this->mLastRevision ) {
 765                         return $this->mLastRevision->getUserText( $audience, $user );
 766                 } else {
 767                         return '';
 768                 }
 769         }
 770
 771         /**
 772          * @param int $audience One of:
 773          *   Revision::FOR_PUBLIC       to be displayed to all users
 774          *   Revision::FOR_THIS_USER    to be displayed to the given user
 775          *   Revision::RAW              get the text regardless of permissions
 776          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 777          *   to the $audience parameter
 778          * @return string Comment stored for the last article revision
 779          */
 780         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 781                 $this->loadLastEdit();
 782                 if ( $this->mLastRevision ) {
 783                         return $this->mLastRevision->getComment( $audience, $user );
 784                 } else {
 785                         return '';
 786                 }
 787         }
 788
 789         /**
 790          * Returns true if last revision was marked as "minor edit"
 791          *
 792          * @return bool Minor edit indicator for the last article revision.
 793          */
 794         public function getMinorEdit() {
 795                 $this->loadLastEdit();
 796                 if ( $this->mLastRevision ) {
 797                         return $this->mLastRevision->isMinor();
 798                 } else {
 799                         return false;
 800                 }
 801         }
 802
 803         /**
 804          * Determine whether a page would be suitable for being counted as an
 805          * article in the site_stats table based on the title & its content
 806          *
 807          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 808          *   if false, the current database state will be used
 809          * @return bool
 810          */
 811         public function isCountable( $editInfo = false ) {
 812                 global $wgArticleCountMethod;
 813
 814                 if ( !$this->mTitle->isContentPage() ) {
 815                         return false;
 816                 }
 817
 818                 if ( $editInfo ) {
 819                         $content = $editInfo->pstContent;
 820                 } else {
 821                         $content = $this->getContent();
 822                 }
 823
 824                 if ( !$content || $content->isRedirect() ) {
 825                         return false;
 826                 }
 827
 828                 $hasLinks = null;
 829
 830                 if ( $wgArticleCountMethod === 'link' ) {
 831                         // nasty special case to avoid re-parsing to detect links
 832
 833                         if ( $editInfo ) {
 834                                 // ParserOutput::getLinks() is a 2D array of page links, so
 835                                 // to be really correct we would need to recurse in the array
 836                                 // but the main array should only have items in it if there are
 837                                 // links.
 838                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 839                         } else {
 840                                 $hasLinks = (bool)wfGetDB( DB_REPLICA )->selectField( 'pagelinks', 1,
 841                                         [ 'pl_from' => $this->getId() ], __METHOD__ );
 842                         }
 843                 }
 844
 845                 return $content->isCountable( $hasLinks );
 846         }
 847
 848         /**
 849          * If this page is a redirect, get its target
 850          *
 851          * The target will be fetched from the redirect table if possible.
 852          * If this page doesn't have an entry there, call insertRedirect()
 853          * @return Title|null Title object, or null if this page is not a redirect
 854          */
 855         public function getRedirectTarget() {
 856                 if ( !$this->mTitle->isRedirect() ) {
 857                         return null;
 858                 }
 859
 860                 if ( $this->mRedirectTarget !== null ) {
 861                         return $this->mRedirectTarget;
 862                 }
 863
 864                 // Query the redirect table
 865                 $dbr = wfGetDB( DB_REPLICA );
 866                 $row = $dbr->selectRow( 'redirect',
 867                         [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ],
 868                         [ 'rd_from' => $this->getId() ],
 869                         __METHOD__
 870                 );
 871
 872                 // rd_fragment and rd_interwiki were added later, populate them if empty
 873                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 874                         $this->mRedirectTarget = Title::makeTitle(
 875                                 $row->rd_namespace, $row->rd_title,
 876                                 $row->rd_fragment, $row->rd_interwiki
 877                         );
 878                         return $this->mRedirectTarget;
 879                 }
 880
 881                 // This page doesn't have an entry in the redirect table
 882                 $this->mRedirectTarget = $this->insertRedirect();
 883                 return $this->mRedirectTarget;
 884         }
 885
 886         /**
 887          * Insert an entry for this page into the redirect table if the content is a redirect
 888          *
 889          * The database update will be deferred via DeferredUpdates
 890          *
 891          * Don't call this function directly unless you know what you're doing.
 892          * @return Title|null Title object or null if not a redirect
 893          */
 894         public function insertRedirect() {
 895                 $content = $this->getContent();
 896                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 897                 if ( !$retval ) {
 898                         return null;
 899                 }
 900
 901                 // Update the DB post-send if the page has not cached since now
 902                 $that = $this;
 903                 $latest = $this->getLatest();
 904                 DeferredUpdates::addCallableUpdate(
 905                         function () use ( $that, $retval, $latest ) {
 906                                 $that->insertRedirectEntry( $retval, $latest );
 907                         },
 908                         DeferredUpdates::POSTSEND,
 909                         wfGetDB( DB_MASTER )
 910                 );
 911
 912                 return $retval;
 913         }
 914
 915         /**
 916          * Insert or update the redirect table entry for this page to indicate it redirects to $rt
 917          * @param Title $rt Redirect target
 918          * @param int|null $oldLatest Prior page_latest for check and set
 919          */
 920         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
 921                 $dbw = wfGetDB( DB_MASTER );
 922                 $dbw->startAtomic( __METHOD__ );
 923
 924                 if ( !$oldLatest || $oldLatest == $this->lockAndGetLatest() ) {
 925                         $dbw->replace( 'redirect',
 926                                 [ 'rd_from' ],
 927                                 [
 928                                         'rd_from' => $this->getId(),
 929                                         'rd_namespace' => $rt->getNamespace(),
 930                                         'rd_title' => $rt->getDBkey(),
 931                                         'rd_fragment' => $rt->getFragment(),
 932                                         'rd_interwiki' => $rt->getInterwiki(),
 933                                 ],
 934                                 __METHOD__
 935                         );
 936                 }
 937
 938                 $dbw->endAtomic( __METHOD__ );
 939         }
 940
 941         /**
 942          * Get the Title object or URL this page redirects to
 943          *
 944          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 945          */
 946         public function followRedirect() {
 947                 return $this->getRedirectURL( $this->getRedirectTarget() );
 948         }
 949
 950         /**
 951          * Get the Title object or URL to use for a redirect. We use Title
 952          * objects for same-wiki, non-special redirects and URLs for everything
 953          * else.
 954          * @param Title $rt Redirect target
 955          * @return bool|Title|string False, Title object of local target, or string with URL
 956          */
 957         public function getRedirectURL( $rt ) {
 958                 if ( !$rt ) {
 959                         return false;
 960                 }
 961
 962                 if ( $rt->isExternal() ) {
 963                         if ( $rt->isLocal() ) {
 964                                 // Offsite wikis need an HTTP redirect.
 965                                 // This can be hard to reverse and may produce loops,
 966                                 // so they may be disabled in the site configuration.
 967                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 968                                 return $rt->getFullURL( [ 'rdfrom' => $source ] );
 969                         } else {
 970                                 // External pages without "local" bit set are not valid
 971                                 // redirect targets
 972                                 return false;
 973                         }
 974                 }
 975
 976                 if ( $rt->isSpecialPage() ) {
 977                         // Gotta handle redirects to special pages differently:
 978                         // Fill the HTTP response "Location" header and ignore the rest of the page we're on.
 979                         // Some pages are not valid targets.
 980                         if ( $rt->isValidRedirectTarget() ) {
 981                                 return $rt->getFullURL();
 982                         } else {
 983                                 return false;
 984                         }
 985                 }
 986
 987                 return $rt;
 988         }
 989
 990         /**
 991          * Get a list of users who have edited this article, not including the user who made
 992          * the most recent revision, which you can get from $article->getUser() if you want it
 993          * @return UserArrayFromResult
 994          */
 995         public function getContributors() {
 996                 // @todo FIXME: This is expensive; cache this info somewhere.
 997
 998                 $dbr = wfGetDB( DB_REPLICA );
 999
1000                 if ( $dbr->implicitGroupby() ) {
1001                         $realNameField = 'user_real_name';
1002                 } else {
1003                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1004                 }
1005
1006                 $tables = [ 'revision', 'user' ];
1007
1008                 $fields = [
1009                         'user_id' => 'rev_user',
1010                         'user_name' => 'rev_user_text',
1011                         $realNameField,
1012                         'timestamp' => 'MAX(rev_timestamp)',
1013                 ];
1014
1015                 $conds = [ 'rev_page' => $this->getId() ];
1016
1017                 // The user who made the top revision gets credited as "this page was last edited by
1018                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1019                 $user = $this->getUser();
1020                 if ( $user ) {
1021                         $conds[] = "rev_user != $user";
1022                 } else {
1023                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1024                 }
1025
1026                 // Username hidden?
1027                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0";
1028
1029                 $jconds = [
1030                         'user' => [ 'LEFT JOIN', 'rev_user = user_id' ],
1031                 ];
1032
1033                 $options = [
1034                         'GROUP BY' => [ 'rev_user', 'rev_user_text' ],
1035                         'ORDER BY' => 'timestamp DESC',
1036                 ];
1037
1038                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1039                 return new UserArrayFromResult( $res );
1040         }
1041
1042         /**
1043          * Should the parser cache be used?
1044          *
1045          * @param ParserOptions $parserOptions ParserOptions to check
1046          * @param int $oldId
1047          * @return bool
1048          */
1049         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
1050                 return $parserOptions->getStubThreshold() == 0
1051                         && $this->exists()
1052                         && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
1053                         && $this->getContentHandler()->isParserCacheSupported();
1054         }
1055
1056         /**
1057          * Get a ParserOutput for the given ParserOptions and revision ID.
1058          *
1059          * The parser cache will be used if possible. Cache misses that result
1060          * in parser runs are debounced with PoolCounter.
1061          *
1062          * @since 1.19
1063          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1064          * @param null|int      $oldid Revision ID to get the text from, passing null or 0 will
1065          *                             get the current revision (default value)
1066          * @param bool          $forceParse Force reindexing, regardless of cache settings
1067          * @return bool|ParserOutput ParserOutput or false if the revision was not found
1068          */
1069         public function getParserOutput(
1070                 ParserOptions $parserOptions, $oldid = null, $forceParse = false
1071         ) {
1072                 $useParserCache =
1073                         ( !$forceParse ) && $this->shouldCheckParserCache( $parserOptions, $oldid );
1074                 wfDebug( __METHOD__ .
1075                         ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1076                 if ( $parserOptions->getStubThreshold() ) {
1077                         wfIncrStats( 'pcache.miss.stub' );
1078                 }
1079
1080                 if ( $useParserCache ) {
1081                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1082                         if ( $parserOutput !== false ) {
1083                                 return $parserOutput;
1084                         }
1085                 }
1086
1087                 if ( $oldid === null || $oldid === 0 ) {
1088                         $oldid = $this->getLatest();
1089                 }
1090
1091                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1092                 $pool->execute();
1093
1094                 return $pool->getParserOutput();
1095         }
1096
1097         /**
1098          * Do standard deferred updates after page view (existing or missing page)
1099          * @param User $user The relevant user
1100          * @param int $oldid Revision id being viewed; if not given or 0, latest revision is assumed
1101          */
1102         public function doViewUpdates( User $user, $oldid = 0 ) {
1103                 if ( wfReadOnly() ) {
1104                         return;
1105                 }
1106
1107                 Hooks::run( 'PageViewUpdates', [ $this, $user ] );
1108                 // Update newtalk / watchlist notification status
1109                 try {
1110                         $user->clearNotification( $this->mTitle, $oldid );
1111                 } catch ( DBError $e ) {
1112                         // Avoid outage if the master is not reachable
1113                         MWExceptionHandler::logException( $e );
1114                 }
1115         }
1116
1117         /**
1118          * Perform the actions of a page purging
1119          * @param integer $flags Bitfield of WikiPage::PURGE_* constants
1120          * @return bool
1121          */
1122         public function doPurge( $flags = self::PURGE_ALL ) {
1123                 if ( !Hooks::run( 'ArticlePurge', [ &$this ] ) ) {
1124                         return false;
1125                 }
1126
1127                 if ( ( $flags & self::PURGE_GLOBAL_PCACHE ) == self::PURGE_GLOBAL_PCACHE ) {
1128                         // Set page_touched in the database to invalidate all DC caches
1129                         $this->mTitle->invalidateCache();
1130                 } elseif ( ( $flags & self::PURGE_CLUSTER_PCACHE ) == self::PURGE_CLUSTER_PCACHE ) {
1131                         // Delete the parser options key in the local cluster to invalidate the DC cache
1132                         ParserCache::singleton()->deleteOptionsKey( $this );
1133                         // Avoid sending HTTP 304s in ViewAction to the client who just issued the purge
1134                         $cache = ObjectCache::getLocalClusterInstance();
1135                         $cache->set(
1136                                 $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ),
1137                                 wfTimestamp( TS_MW ),
1138                                 $cache::TTL_HOUR
1139                         );
1140                 }
1141
1142                 if ( ( $flags & self::PURGE_CDN_CACHE ) == self::PURGE_CDN_CACHE ) {
1143                         // Clear any HTML file cache
1144                         HTMLFileCache::clearFileCache( $this->getTitle() );
1145                         // Send purge after any page_touched above update was committed
1146                         DeferredUpdates::addUpdate(
1147                                 new CdnCacheUpdate( $this->mTitle->getCdnUrls() ),
1148                                 DeferredUpdates::PRESEND
1149                         );
1150                 }
1151
1152                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1153                         // @todo move this logic to MessageCache
1154                         if ( $this->exists() ) {
1155                                 // NOTE: use transclusion text for messages.
1156                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1157
1158                                 $content = $this->getContent();
1159                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1160
1161                                 if ( $text === null ) {
1162                                         $text = false;
1163                                 }
1164                         } else {
1165                                 $text = false;
1166                         }
1167
1168                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1169                 }
1170
1171                 return true;
1172         }
1173
1174         /**
1175          * Get the last time a user explicitly purged the page via action=purge
1176          *
1177          * @return string|bool TS_MW timestamp or false
1178          * @since 1.28
1179          */
1180         public function getLastPurgeTimestamp() {
1181                 $cache = ObjectCache::getLocalClusterInstance();
1182
1183                 return $cache->get( $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ) );
1184         }
1185
1186         /**
1187          * Insert a new empty page record for this article.
1188          * This *must* be followed up by creating a revision
1189          * and running $this->updateRevisionOn( ... );
1190          * or else the record will be left in a funky state.
1191          * Best if all done inside a transaction.
1192          *
1193          * @param IDatabase $dbw
1194          * @param int|null $pageId Custom page ID that will be used for the insert statement
1195          *
1196          * @return bool|int The newly created page_id key; false if the row was not
1197          *   inserted, e.g. because the title already existed or because the specified
1198          *   page ID is already in use.
1199          */
1200         public function insertOn( $dbw, $pageId = null ) {
1201                 $pageIdForInsert = $pageId ?: $dbw->nextSequenceValue( 'page_page_id_seq' );
1202                 $dbw->insert(
1203                         'page',
1204                         [
1205                                 'page_id'           => $pageIdForInsert,
1206                                 'page_namespace'    => $this->mTitle->getNamespace(),
1207                                 'page_title'        => $this->mTitle->getDBkey(),
1208                                 'page_restrictions' => '',
1209                                 'page_is_redirect'  => 0, // Will set this shortly...
1210                                 'page_is_new'       => 1,
1211                                 'page_random'       => wfRandom(),
1212                                 'page_touched'      => $dbw->timestamp(),
1213                                 'page_latest'       => 0, // Fill this in shortly...
1214                                 'page_len'          => 0, // Fill this in shortly...
1215                         ],
1216                         __METHOD__,
1217                         'IGNORE'
1218                 );
1219
1220                 if ( $dbw->affectedRows() > 0 ) {
1221                         $newid = $pageId ?: $dbw->insertId();
1222                         $this->mId = $newid;
1223                         $this->mTitle->resetArticleID( $newid );
1224
1225                         return $newid;
1226                 } else {
1227                         return false; // nothing changed
1228                 }
1229         }
1230
1231         /**
1232          * Update the page record to point to a newly saved revision.
1233          *
1234          * @param IDatabase $dbw
1235          * @param Revision $revision For ID number, and text used to set
1236          *   length and redirect status fields
1237          * @param int $lastRevision If given, will not overwrite the page field
1238          *   when different from the currently set value.
1239          *   Giving 0 indicates the new page flag should be set on.
1240          * @param bool $lastRevIsRedirect If given, will optimize adding and
1241          *   removing rows in redirect table.
1242          * @return bool Success; false if the page row was missing or page_latest changed
1243          */
1244         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1245                 $lastRevIsRedirect = null
1246         ) {
1247                 global $wgContentHandlerUseDB;
1248
1249                 // Assertion to try to catch T92046
1250                 if ( (int)$revision->getId() === 0 ) {
1251                         throw new InvalidArgumentException(
1252                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1253                         );
1254                 }
1255
1256                 $content = $revision->getContent();
1257                 $len = $content ? $content->getSize() : 0;
1258                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1259
1260                 $conditions = [ 'page_id' => $this->getId() ];
1261
1262                 if ( !is_null( $lastRevision ) ) {
1263                         // An extra check against threads stepping on each other
1264                         $conditions['page_latest'] = $lastRevision;
1265                 }
1266
1267                 $row = [ /* SET */
1268                         'page_latest'      => $revision->getId(),
1269                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1270                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1271                         'page_is_redirect' => $rt !== null ? 1 : 0,
1272                         'page_len'         => $len,
1273                 ];
1274
1275                 if ( $wgContentHandlerUseDB ) {
1276                         $row['page_content_model'] = $revision->getContentModel();
1277                 }
1278
1279                 $dbw->update( 'page',
1280                         $row,
1281                         $conditions,
1282                         __METHOD__ );
1283
1284                 $result = $dbw->affectedRows() > 0;
1285                 if ( $result ) {
1286                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1287                         $this->setLastEdit( $revision );
1288                         $this->mLatest = $revision->getId();
1289                         $this->mIsRedirect = (bool)$rt;
1290                         // Update the LinkCache.
1291                         LinkCache::singleton()->addGoodLinkObj(
1292                                 $this->getId(),
1293                                 $this->mTitle,
1294                                 $len,
1295                                 $this->mIsRedirect,
1296                                 $this->mLatest,
1297                                 $revision->getContentModel()
1298                         );
1299                 }
1300
1301                 return $result;
1302         }
1303
1304         /**
1305          * Add row to the redirect table if this is a redirect, remove otherwise.
1306          *
1307          * @param IDatabase $dbw
1308          * @param Title $redirectTitle Title object pointing to the redirect target,
1309          *   or NULL if this is not a redirect
1310          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1311          *   removing rows in redirect table.
1312          * @return bool True on success, false on failure
1313          * @private
1314          */
1315         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1316                 // Always update redirects (target link might have changed)
1317                 // Update/Insert if we don't know if the last revision was a redirect or not
1318                 // Delete if changing from redirect to non-redirect
1319                 $isRedirect = !is_null( $redirectTitle );
1320
1321                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1322                         return true;
1323                 }
1324
1325                 if ( $isRedirect ) {
1326                         $this->insertRedirectEntry( $redirectTitle );
1327                 } else {
1328                         // This is not a redirect, remove row from redirect table
1329                         $where = [ 'rd_from' => $this->getId() ];
1330                         $dbw->delete( 'redirect', $where, __METHOD__ );
1331                 }
1332
1333                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1334                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1335                 }
1336
1337                 return ( $dbw->affectedRows() != 0 );
1338         }
1339
1340         /**
1341          * If the given revision is newer than the currently set page_latest,
1342          * update the page record. Otherwise, do nothing.
1343          *
1344          * @deprecated since 1.24, use updateRevisionOn instead
1345          *
1346          * @param IDatabase $dbw
1347          * @param Revision $revision
1348          * @return bool
1349          */
1350         public function updateIfNewerOn( $dbw, $revision ) {
1351
1352                 $row = $dbw->selectRow(
1353                         [ 'revision', 'page' ],
1354                         [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
1355                         [
1356                                 'page_id' => $this->getId(),
1357                                 'page_latest=rev_id' ],
1358                         __METHOD__ );
1359
1360                 if ( $row ) {
1361                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1362                                 return false;
1363                         }
1364                         $prev = $row->rev_id;
1365                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1366                 } else {
1367                         // No or missing previous revision; mark the page as new
1368                         $prev = 0;
1369                         $lastRevIsRedirect = null;
1370                 }
1371
1372                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1373
1374                 return $ret;
1375         }
1376
1377         /**
1378          * Get the content that needs to be saved in order to undo all revisions
1379          * between $undo and $undoafter. Revisions must belong to the same page,
1380          * must exist and must not be deleted
1381          * @param Revision $undo
1382          * @param Revision $undoafter Must be an earlier revision than $undo
1383          * @return Content|bool Content on success, false on failure
1384          * @since 1.21
1385          * Before we had the Content object, this was done in getUndoText
1386          */
1387         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1388                 $handler = $undo->getContentHandler();
1389                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1390         }
1391
1392         /**
1393          * Returns true if this page's content model supports sections.
1394          *
1395          * @return bool
1396          *
1397          * @todo The skin should check this and not offer section functionality if
1398          *   sections are not supported.
1399          * @todo The EditPage should check this and not offer section functionality
1400          *   if sections are not supported.
1401          */
1402         public function supportsSections() {
1403                 return $this->getContentHandler()->supportsSections();
1404         }
1405
1406         /**
1407          * @param string|number|null|bool $sectionId Section identifier as a number or string
1408          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1409          * or 'new' for a new section.
1410          * @param Content $sectionContent New content of the section.
1411          * @param string $sectionTitle New section's subject, only if $section is "new".
1412          * @param string $edittime Revision timestamp or null to use the current revision.
1413          *
1414          * @throws MWException
1415          * @return Content|null New complete article content, or null if error.
1416          *
1417          * @since 1.21
1418          * @deprecated since 1.24, use replaceSectionAtRev instead
1419          */
1420         public function replaceSectionContent(
1421                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
1422         ) {
1423
1424                 $baseRevId = null;
1425                 if ( $edittime && $sectionId !== 'new' ) {
1426                         $dbr = wfGetDB( DB_REPLICA );
1427                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1428                         // Try the master if this thread may have just added it.
1429                         // This could be abstracted into a Revision method, but we don't want
1430                         // to encourage loading of revisions by timestamp.
1431                         if ( !$rev
1432                                 && wfGetLB()->getServerCount() > 1
1433                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1434                         ) {
1435                                 $dbw = wfGetDB( DB_MASTER );
1436                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1437                         }
1438                         if ( $rev ) {
1439                                 $baseRevId = $rev->getId();
1440                         }
1441                 }
1442
1443                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1444         }
1445
1446         /**
1447          * @param string|number|null|bool $sectionId Section identifier as a number or string
1448          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1449          * or 'new' for a new section.
1450          * @param Content $sectionContent New content of the section.
1451          * @param string $sectionTitle New section's subject, only if $section is "new".
1452          * @param int|null $baseRevId
1453          *
1454          * @throws MWException
1455          * @return Content|null New complete article content, or null if error.
1456          *
1457          * @since 1.24
1458          */
1459         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1460                 $sectionTitle = '', $baseRevId = null
1461         ) {
1462
1463                 if ( strval( $sectionId ) === '' ) {
1464                         // Whole-page edit; let the whole text through
1465                         $newContent = $sectionContent;
1466                 } else {
1467                         if ( !$this->supportsSections() ) {
1468                                 throw new MWException( "sections not supported for content model " .
1469                                         $this->getContentHandler()->getModelID() );
1470                         }
1471
1472                         // Bug 30711: always use current version when adding a new section
1473                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1474                                 $oldContent = $this->getContent();
1475                         } else {
1476                                 $rev = Revision::newFromId( $baseRevId );
1477                                 if ( !$rev ) {
1478                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1479                                                 $this->getId() . "; section: $sectionId)\n" );
1480                                         return null;
1481                                 }
1482
1483                                 $oldContent = $rev->getContent();
1484                         }
1485
1486                         if ( !$oldContent ) {
1487                                 wfDebug( __METHOD__ . ": no page text\n" );
1488                                 return null;
1489                         }
1490
1491                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1492                 }
1493
1494                 return $newContent;
1495         }
1496
1497         /**
1498          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1499          * @param int $flags
1500          * @return int Updated $flags
1501          */
1502         public function checkFlags( $flags ) {
1503                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1504                         if ( $this->exists() ) {
1505                                 $flags |= EDIT_UPDATE;
1506                         } else {
1507                                 $flags |= EDIT_NEW;
1508                         }
1509                 }
1510
1511                 return $flags;
1512         }
1513
1514         /**
1515          * Change an existing article or create a new article. Updates RC and all necessary caches,
1516          * optionally via the deferred update array.
1517          *
1518          * @param string $text New text
1519          * @param string $summary Edit summary
1520          * @param int $flags Bitfield:
1521          *      EDIT_NEW
1522          *          Article is known or assumed to be non-existent, create a new one
1523          *      EDIT_UPDATE
1524          *          Article is known or assumed to be pre-existing, update it
1525          *      EDIT_MINOR
1526          *          Mark this edit minor, if the user is allowed to do so
1527          *      EDIT_SUPPRESS_RC
1528          *          Do not log the change in recentchanges
1529          *      EDIT_FORCE_BOT
1530          *          Mark the edit a "bot" edit regardless of user rights
1531          *      EDIT_AUTOSUMMARY
1532          *          Fill in blank summaries with generated text where possible
1533          *      EDIT_INTERNAL
1534          *          Signal that the page retrieve/save cycle happened entirely in this request.
1535          *
1536          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1537          * article will be detected. If EDIT_UPDATE is specified and the article
1538          * doesn't exist, the function will return an edit-gone-missing error. If
1539          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1540          * error will be returned. These two conditions are also possible with
1541          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1542          *
1543          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1544          *   This is not the parent revision ID, rather the revision ID for older
1545          *   content used as the source for a rollback, for example.
1546          * @param User $user The user doing the edit
1547          *
1548          * @throws MWException
1549          * @return Status Possible errors:
1550          *   edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1551          *     set the fatal flag of $status
1552          *   edit-gone-missing: In update mode, but the article didn't exist.
1553          *   edit-conflict: In update mode, the article changed unexpectedly.
1554          *   edit-no-change: Warning that the text was the same as before.
1555          *   edit-already-exists: In creation mode, but the article already exists.
1556          *
1557          * Extensions may define additional errors.
1558          *
1559          * $return->value will contain an associative array with members as follows:
1560          *     new: Boolean indicating if the function attempted to create a new article.
1561          *     revision: The revision object for the inserted revision, or null.
1562          *
1563          * Compatibility note: this function previously returned a boolean value
1564          * indicating success/failure
1565          *
1566          * @deprecated since 1.21: use doEditContent() instead.
1567          */
1568         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1569                 ContentHandler::deprecated( __METHOD__, '1.21' );
1570
1571                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1572
1573                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1574         }
1575
1576         /**
1577          * Change an existing article or create a new article. Updates RC and all necessary caches,
1578          * optionally via the deferred update array.
1579          *
1580          * @param Content $content New content
1581          * @param string $summary Edit summary
1582          * @param int $flags Bitfield:
1583          *      EDIT_NEW
1584          *          Article is known or assumed to be non-existent, create a new one
1585          *      EDIT_UPDATE
1586          *          Article is known or assumed to be pre-existing, update it
1587          *      EDIT_MINOR
1588          *          Mark this edit minor, if the user is allowed to do so
1589          *      EDIT_SUPPRESS_RC
1590          *          Do not log the change in recentchanges
1591          *      EDIT_FORCE_BOT
1592          *          Mark the edit a "bot" edit regardless of user rights
1593          *      EDIT_AUTOSUMMARY
1594          *          Fill in blank summaries with generated text where possible
1595          *      EDIT_INTERNAL
1596          *          Signal that the page retrieve/save cycle happened entirely in this request.
1597          *
1598          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1599          * article will be detected. If EDIT_UPDATE is specified and the article
1600          * doesn't exist, the function will return an edit-gone-missing error. If
1601          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1602          * error will be returned. These two conditions are also possible with
1603          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1604          *
1605          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1606          *   This is not the parent revision ID, rather the revision ID for older
1607          *   content used as the source for a rollback, for example.
1608          * @param User $user The user doing the edit
1609          * @param string $serialFormat Format for storing the content in the
1610          *   database.
1611          * @param array|null $tags Change tags to apply to this edit
1612          * Callers are responsible for permission checks
1613          * (with ChangeTags::canAddTagsAccompanyingChange)
1614          *
1615          * @throws MWException
1616          * @return Status Possible errors:
1617          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1618          *       set the fatal flag of $status.
1619          *     edit-gone-missing: In update mode, but the article didn't exist.
1620          *     edit-conflict: In update mode, the article changed unexpectedly.
1621          *     edit-no-change: Warning that the text was the same as before.
1622          *     edit-already-exists: In creation mode, but the article already exists.
1623          *
1624          *  Extensions may define additional errors.
1625          *
1626          *  $return->value will contain an associative array with members as follows:
1627          *     new: Boolean indicating if the function attempted to create a new article.
1628          *     revision: The revision object for the inserted revision, or null.
1629          *
1630          * @since 1.21
1631          * @throws MWException
1632          */
1633         public function doEditContent(
1634                 Content $content, $summary, $flags = 0, $baseRevId = false,
1635                 User $user = null, $serialFormat = null, $tags = null
1636         ) {
1637                 global $wgUser, $wgUseAutomaticEditSummaries;
1638
1639                 // Low-level sanity check
1640                 if ( $this->mTitle->getText() === '' ) {
1641                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1642                 }
1643                 // Make sure the given content type is allowed for this page
1644                 if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
1645                         return Status::newFatal( 'content-not-allowed-here',
1646                                 ContentHandler::getLocalizedName( $content->getModel() ),
1647                                 $this->mTitle->getPrefixedText()
1648                         );
1649                 }
1650
1651                 // Load the data from the master database if needed.
1652                 // The caller may already loaded it from the master or even loaded it using
1653                 // SELECT FOR UPDATE, so do not override that using clear().
1654                 $this->loadPageData( 'fromdbmaster' );
1655
1656                 $user = $user ?: $wgUser;
1657                 $flags = $this->checkFlags( $flags );
1658
1659                 // Trigger pre-save hook (using provided edit summary)
1660                 $hookStatus = Status::newGood( [] );
1661                 $hook_args = [ &$this, &$user, &$content, &$summary,
1662                                                         $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
1663                 // Check if the hook rejected the attempted save
1664                 if ( !Hooks::run( 'PageContentSave', $hook_args )
1665                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args )
1666                 ) {
1667                         if ( $hookStatus->isOK() ) {
1668                                 // Hook returned false but didn't call fatal(); use generic message
1669                                 $hookStatus->fatal( 'edit-hook-aborted' );
1670                         }
1671
1672                         return $hookStatus;
1673                 }
1674
1675                 $old_revision = $this->getRevision(); // current revision
1676                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1677
1678                 // Provide autosummaries if one is not provided and autosummaries are enabled
1679                 if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
1680                         $handler = $content->getContentHandler();
1681                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1682                 }
1683
1684                 // Avoid statsd noise and wasted cycles check the edit stash (T136678)
1685                 if ( ( $flags & EDIT_INTERNAL ) || ( $flags & EDIT_FORCE_BOT ) ) {
1686                         $useCache = false;
1687                 } else {
1688                         $useCache = true;
1689                 }
1690
1691                 // Get the pre-save transform content and final parser output
1692                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat, $useCache );
1693                 $pstContent = $editInfo->pstContent; // Content object
1694                 $meta = [
1695                         'bot' => ( $flags & EDIT_FORCE_BOT ),
1696                         'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
1697                         'serialized' => $editInfo->pst,
1698                         'serialFormat' => $serialFormat,
1699                         'baseRevId' => $baseRevId,
1700                         'oldRevision' => $old_revision,
1701                         'oldContent' => $old_content,
1702                         'oldId' => $this->getLatest(),
1703                         'oldIsRedirect' => $this->isRedirect(),
1704                         'oldCountable' => $this->isCountable(),
1705                         'tags' => ( $tags !== null ) ? (array)$tags : []
1706                 ];
1707
1708                 // Actually create the revision and create/update the page
1709                 if ( $flags & EDIT_UPDATE ) {
1710                         $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
1711                 } else {
1712                         $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
1713                 }
1714
1715                 // Promote user to any groups they meet the criteria for
1716                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1717                         $user->addAutopromoteOnceGroups( 'onEdit' );
1718                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1719                 } );
1720
1721                 return $status;
1722         }
1723
1724         /**
1725          * @param Content $content Pre-save transform content
1726          * @param integer $flags
1727          * @param User $user
1728          * @param string $summary
1729          * @param array $meta
1730          * @return Status
1731          * @throws DBUnexpectedError
1732          * @throws Exception
1733          * @throws FatalError
1734          * @throws MWException
1735          */
1736         private function doModify(
1737                 Content $content, $flags, User $user, $summary, array $meta
1738         ) {
1739                 global $wgUseRCPatrol;
1740
1741                 // Update article, but only if changed.
1742                 $status = Status::newGood( [ 'new' => false, 'revision' => null ] );
1743
1744                 // Convenience variables
1745                 $now = wfTimestampNow();
1746                 $oldid = $meta['oldId'];
1747                 /** @var $oldContent Content|null */
1748                 $oldContent = $meta['oldContent'];
1749                 $newsize = $content->getSize();
1750
1751                 if ( !$oldid ) {
1752                         // Article gone missing
1753                         $status->fatal( 'edit-gone-missing' );
1754
1755                         return $status;
1756                 } elseif ( !$oldContent ) {
1757                         // Sanity check for bug 37225
1758                         throw new MWException( "Could not find text for current revision {$oldid}." );
1759                 }
1760
1761                 // @TODO: pass content object?!
1762                 $revision = new Revision( [
1763                         'page'       => $this->getId(),
1764                         'title'      => $this->mTitle, // for determining the default content model
1765                         'comment'    => $summary,
1766                         'minor_edit' => $meta['minor'],
1767                         'text'       => $meta['serialized'],
1768                         'len'        => $newsize,
1769                         'parent_id'  => $oldid,
1770                         'user'       => $user->getId(),
1771                         'user_text'  => $user->getName(),
1772                         'timestamp'  => $now,
1773                         'content_model' => $content->getModel(),
1774                         'content_format' => $meta['serialFormat'],
1775                 ] );
1776
1777                 $changed = !$content->equals( $oldContent );
1778
1779                 $dbw = wfGetDB( DB_MASTER );
1780
1781                 if ( $changed ) {
1782                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1783                         $status->merge( $prepStatus );
1784                         if ( !$status->isOK() ) {
1785                                 return $status;
1786                         }
1787
1788                         $dbw->startAtomic( __METHOD__ );
1789                         // Get the latest page_latest value while locking it.
1790                         // Do a CAS style check to see if it's the same as when this method
1791                         // started. If it changed then bail out before touching the DB.
1792                         $latestNow = $this->lockAndGetLatest();
1793                         if ( $latestNow != $oldid ) {
1794                                 $dbw->endAtomic( __METHOD__ );
1795                                 // Page updated or deleted in the mean time
1796                                 $status->fatal( 'edit-conflict' );
1797
1798                                 return $status;
1799                         }
1800
1801                         // At this point we are now comitted to returning an OK
1802                         // status unless some DB query error or other exception comes up.
1803                         // This way callers don't have to call rollback() if $status is bad
1804                         // unless they actually try to catch exceptions (which is rare).
1805
1806                         // Save the revision text
1807                         $revisionId = $revision->insertOn( $dbw );
1808                         // Update page_latest and friends to reflect the new revision
1809                         if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
1810                                 throw new MWException( "Failed to update page row to use new revision." );
1811                         }
1812
1813                         Hooks::run( 'NewRevisionFromEditComplete',
1814                                 [ $this, $revision, $meta['baseRevId'], $user ] );
1815
1816                         // Update recentchanges
1817                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1818                                 // Mark as patrolled if the user can do so
1819                                 $patrolled = $wgUseRCPatrol && !count(
1820                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1821                                 // Add RC row to the DB
1822                                 RecentChange::notifyEdit(
1823                                         $now,
1824                                         $this->mTitle,
1825                                         $revision->isMinor(),
1826                                         $user,
1827                                         $summary,
1828                                         $oldid,
1829                                         $this->getTimestamp(),
1830                                         $meta['bot'],
1831                                         '',
1832                                         $oldContent ? $oldContent->getSize() : 0,
1833                                         $newsize,
1834                                         $revisionId,
1835                                         $patrolled,
1836                                         $meta['tags']
1837                                 );
1838                         }
1839
1840                         $user->incEditCount();
1841
1842                         $dbw->endAtomic( __METHOD__ );
1843                         $this->mTimestamp = $now;
1844                 } else {
1845                         // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1846                         // related variables correctly. Likewise for {{REVISIONUSER}} (T135261).
1847                         $revision->setId( $this->getLatest() );
1848                         $revision->setUserIdAndName(
1849                                 $this->getUser( Revision::RAW ),
1850                                 $this->getUserText( Revision::RAW )
1851                         );
1852                 }
1853
1854                 if ( $changed ) {
1855                         // Return the new revision to the caller
1856                         $status->value['revision'] = $revision;
1857                 } else {
1858                         $status->warning( 'edit-no-change' );
1859                         // Update page_touched as updateRevisionOn() was not called.
1860                         // Other cache updates are managed in onArticleEdit() via doEditUpdates().
1861                         $this->mTitle->invalidateCache( $now );
1862                 }
1863
1864                 // Do secondary updates once the main changes have been committed...
1865                 DeferredUpdates::addUpdate(
1866                         new AtomicSectionUpdate(
1867                                 $dbw,
1868                                 __METHOD__,
1869                                 function () use (
1870                                         $revision, &$user, $content, $summary, &$flags,
1871                                         $changed, $meta, &$status
1872                                 ) {
1873                                         // Update links tables, site stats, etc.
1874                                         $this->doEditUpdates(
1875                                                 $revision,
1876                                                 $user,
1877                                                 [
1878                                                         'changed' => $changed,
1879                                                         'oldcountable' => $meta['oldCountable'],
1880                                                         'oldrevision' => $meta['oldRevision']
1881                                                 ]
1882                                         );
1883                                         // Trigger post-save hook
1884                                         $params = [ &$this, &$user, $content, $summary, $flags & EDIT_MINOR,
1885                                                 null, null, &$flags, $revision, &$status, $meta['baseRevId'] ];
1886                                         ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params );
1887                                         Hooks::run( 'PageContentSaveComplete', $params );
1888                                 }
1889                         ),
1890                         DeferredUpdates::PRESEND
1891                 );
1892
1893                 return $status;
1894         }
1895
1896         /**
1897          * @param Content $content Pre-save transform content
1898          * @param integer $flags
1899          * @param User $user
1900          * @param string $summary
1901          * @param array $meta
1902          * @return Status
1903          * @throws DBUnexpectedError
1904          * @throws Exception
1905          * @throws FatalError
1906          * @throws MWException
1907          */
1908         private function doCreate(
1909                 Content $content, $flags, User $user, $summary, array $meta
1910         ) {
1911                 global $wgUseRCPatrol, $wgUseNPPatrol;
1912
1913                 $status = Status::newGood( [ 'new' => true, 'revision' => null ] );
1914
1915                 $now = wfTimestampNow();
1916                 $newsize = $content->getSize();
1917                 $prepStatus = $content->prepareSave( $this, $flags, $meta['oldId'], $user );
1918                 $status->merge( $prepStatus );
1919                 if ( !$status->isOK() ) {
1920                         return $status;
1921                 }
1922
1923                 $dbw = wfGetDB( DB_MASTER );
1924                 $dbw->startAtomic( __METHOD__ );
1925
1926                 // Add the page record unless one already exists for the title
1927                 $newid = $this->insertOn( $dbw );
1928                 if ( $newid === false ) {
1929                         $dbw->endAtomic( __METHOD__ ); // nothing inserted
1930                         $status->fatal( 'edit-already-exists' );
1931
1932                         return $status; // nothing done
1933                 }
1934
1935                 // At this point we are now comitted to returning an OK
1936                 // status unless some DB query error or other exception comes up.
1937                 // This way callers don't have to call rollback() if $status is bad
1938                 // unless they actually try to catch exceptions (which is rare).
1939
1940                 // @TODO: pass content object?!
1941                 $revision = new Revision( [
1942                         'page'       => $newid,
1943                         'title'      => $this->mTitle, // for determining the default content model
1944                         'comment'    => $summary,
1945                         'minor_edit' => $meta['minor'],
1946                         'text'       => $meta['serialized'],
1947                         'len'        => $newsize,
1948                         'user'       => $user->getId(),
1949                         'user_text'  => $user->getName(),
1950                         'timestamp'  => $now,
1951                         'content_model' => $content->getModel(),
1952                         'content_format' => $meta['serialFormat'],
1953                 ] );
1954
1955                 // Save the revision text...
1956                 $revisionId = $revision->insertOn( $dbw );
1957                 // Update the page record with revision data
1958                 if ( !$this->updateRevisionOn( $dbw, $revision, 0 ) ) {
1959                         throw new MWException( "Failed to update page row to use new revision." );
1960                 }
1961
1962                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
1963
1964                 // Update recentchanges
1965                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1966                         // Mark as patrolled if the user can do so
1967                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) &&
1968                                 !count( $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1969                         // Add RC row to the DB
1970                         RecentChange::notifyNew(
1971                                 $now,
1972                                 $this->mTitle,
1973                                 $revision->isMinor(),
1974                                 $user,
1975                                 $summary,
1976                                 $meta['bot'],
1977                                 '',
1978                                 $newsize,
1979                                 $revisionId,
1980                                 $patrolled,
1981                                 $meta['tags']
1982                         );
1983                 }
1984
1985                 $user->incEditCount();
1986
1987                 $dbw->endAtomic( __METHOD__ );
1988                 $this->mTimestamp = $now;
1989
1990                 // Return the new revision to the caller
1991                 $status->value['revision'] = $revision;
1992
1993                 // Do secondary updates once the main changes have been committed...
1994                 DeferredUpdates::addUpdate(
1995                         new AtomicSectionUpdate(
1996                                 $dbw,
1997                                 __METHOD__,
1998                                 function () use (
1999                                         $revision, &$user, $content, $summary, &$flags, $meta, &$status
2000                                 ) {
2001                                         // Update links, etc.
2002                                         $this->doEditUpdates( $revision, $user, [ 'created' => true ] );
2003                                         // Trigger post-create hook
2004                                         $params = [ &$this, &$user, $content, $summary,
2005                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ];
2006                                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $params );
2007                                         Hooks::run( 'PageContentInsertComplete', $params );
2008                                         // Trigger post-save hook
2009                                         $params = array_merge( $params, [ &$status, $meta['baseRevId'] ] );
2010                                         ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params );
2011                                         Hooks::run( 'PageContentSaveComplete', $params );
2012
2013                                 }
2014                         ),
2015                         DeferredUpdates::PRESEND
2016                 );
2017
2018                 return $status;
2019         }
2020
2021         /**
2022          * Get parser options suitable for rendering the primary article wikitext
2023          *
2024          * @see ContentHandler::makeParserOptions
2025          *
2026          * @param IContextSource|User|string $context One of the following:
2027          *        - IContextSource: Use the User and the Language of the provided
2028          *          context
2029          *        - User: Use the provided User object and $wgLang for the language,
2030          *          so use an IContextSource object if possible.
2031          *        - 'canonical': Canonical options (anonymous user with default
2032          *          preferences and content language).
2033          * @return ParserOptions
2034          */
2035         public function makeParserOptions( $context ) {
2036                 $options = $this->getContentHandler()->makeParserOptions( $context );
2037
2038                 if ( $this->getTitle()->isConversionTable() ) {
2039                         // @todo ConversionTable should become a separate content model, so
2040                         // we don't need special cases like this one.
2041                         $options->disableContentConversion();
2042                 }
2043
2044                 return $options;
2045         }
2046
2047         /**
2048          * Prepare text which is about to be saved.
2049          * Returns a stdClass with source, pst and output members
2050          *
2051          * @param string $text
2052          * @param int|null $revid
2053          * @param User|null $user
2054          * @deprecated since 1.21: use prepareContentForEdit instead.
2055          * @return object
2056          */
2057         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2058                 ContentHandler::deprecated( __METHOD__, '1.21' );
2059                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2060                 return $this->prepareContentForEdit( $content, $revid, $user );
2061         }
2062
2063         /**
2064          * Prepare content which is about to be saved.
2065          * Returns a stdClass with source, pst and output members
2066          *
2067          * @param Content $content
2068          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
2069          *        revision ID is also accepted, but this is deprecated.
2070          * @param User|null $user
2071          * @param string|null $serialFormat
2072          * @param bool $useCache Check shared prepared edit cache
2073          *
2074          * @return object
2075          *
2076          * @since 1.21
2077          */
2078         public function prepareContentForEdit(
2079                 Content $content, $revision = null, User $user = null,
2080                 $serialFormat = null, $useCache = true
2081         ) {
2082                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2083
2084                 if ( is_object( $revision ) ) {
2085                         $revid = $revision->getId();
2086                 } else {
2087                         $revid = $revision;
2088                         // This code path is deprecated, and nothing is known to
2089                         // use it, so performance here shouldn't be a worry.
2090                         if ( $revid !== null ) {
2091                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2092                         } else {
2093                                 $revision = null;
2094                         }
2095                 }
2096
2097                 $user = is_null( $user ) ? $wgUser : $user;
2098                 // XXX: check $user->getId() here???
2099
2100                 // Use a sane default for $serialFormat, see bug 57026
2101                 if ( $serialFormat === null ) {
2102                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2103                 }
2104
2105                 if ( $this->mPreparedEdit
2106                         && isset( $this->mPreparedEdit->newContent )
2107                         && $this->mPreparedEdit->newContent->equals( $content )
2108                         && $this->mPreparedEdit->revid == $revid
2109                         && $this->mPreparedEdit->format == $serialFormat
2110                         // XXX: also check $user here?
2111                 ) {
2112                         // Already prepared
2113                         return $this->mPreparedEdit;
2114                 }
2115
2116                 // The edit may have already been prepared via api.php?action=stashedit
2117                 $cachedEdit = $useCache && $wgAjaxEditStash
2118                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2119                         : false;
2120
2121                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2122                 Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );
2123
2124                 $edit = (object)[];
2125                 if ( $cachedEdit ) {
2126                         $edit->timestamp = $cachedEdit->timestamp;
2127                 } else {
2128                         $edit->timestamp = wfTimestampNow();
2129                 }
2130                 // @note: $cachedEdit is safely not used if the rev ID was referenced in the text
2131                 $edit->revid = $revid;
2132
2133                 if ( $cachedEdit ) {
2134                         $edit->pstContent = $cachedEdit->pstContent;
2135                 } else {
2136                         $edit->pstContent = $content
2137                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2138                                 : null;
2139                 }
2140
2141                 $edit->format = $serialFormat;
2142                 $edit->popts = $this->makeParserOptions( 'canonical' );
2143                 if ( $cachedEdit ) {
2144                         $edit->output = $cachedEdit->output;
2145                 } else {
2146                         if ( $revision ) {
2147                                 // We get here if vary-revision is set. This means that this page references
2148                                 // itself (such as via self-transclusion). In this case, we need to make sure
2149                                 // that any such self-references refer to the newly-saved revision, and not
2150                                 // to the previous one, which could otherwise happen due to replica DB lag.
2151                                 $oldCallback = $edit->popts->getCurrentRevisionCallback();
2152                                 $edit->popts->setCurrentRevisionCallback(
2153                                         function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
2154                                                 if ( $title->equals( $revision->getTitle() ) ) {
2155                                                         return $revision;
2156                                                 } else {
2157                                                         return call_user_func( $oldCallback, $title, $parser );
2158                                                 }
2159                                         }
2160                                 );
2161                         } else {
2162                                 // Try to avoid a second parse if {{REVISIONID}} is used
2163                                 $edit->popts->setSpeculativeRevIdCallback( function () {
2164                                         return 1 + (int)wfGetDB( DB_MASTER )->selectField(
2165                                                 'revision',
2166                                                 'MAX(rev_id)',
2167                                                 [],
2168                                                 __METHOD__
2169                                         );
2170                                 } );
2171                         }
2172                         $edit->output = $edit->pstContent
2173                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2174                                 : null;
2175                 }
2176
2177                 $edit->newContent = $content;
2178                 $edit->oldContent = $this->getContent( Revision::RAW );
2179
2180                 // NOTE: B/C for hooks! don't use these fields!
2181                 $edit->newText = $edit->newContent
2182                         ? ContentHandler::getContentText( $edit->newContent )
2183                         : '';
2184                 $edit->oldText = $edit->oldContent
2185                         ? ContentHandler::getContentText( $edit->oldContent )
2186                         : '';
2187                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2188
2189                 if ( $edit->output ) {
2190                         $edit->output->setCacheTime( wfTimestampNow() );
2191                 }
2192
2193                 // Process cache the result
2194                 $this->mPreparedEdit = $edit;
2195
2196                 return $edit;
2197         }
2198
2199         /**
2200          * Do standard deferred updates after page edit.
2201          * Update links tables, site stats, search index and message cache.
2202          * Purges pages that include this page if the text was changed here.
2203          * Every 100th edit, prune the recent changes table.
2204          *
2205          * @param Revision $revision
2206          * @param User $user User object that did the revision
2207          * @param array $options Array of options, following indexes are used:
2208          * - changed: boolean, whether the revision changed the content (default true)
2209          * - created: boolean, whether the revision created the page (default false)
2210          * - moved: boolean, whether the page was moved (default false)
2211          * - restored: boolean, whether the page was undeleted (default false)
2212          * - oldrevision: Revision object for the pre-update revision (default null)
2213          * - oldcountable: boolean, null, or string 'no-change' (default null):
2214          *   - boolean: whether the page was counted as an article before that
2215          *     revision, only used in changed is true and created is false
2216          *   - null: if created is false, don't update the article count; if created
2217          *     is true, do update the article count
2218          *   - 'no-change': don't update the article count, ever
2219          */
2220         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2221                 global $wgRCWatchCategoryMembership, $wgContLang;
2222
2223                 $options += [
2224                         'changed' => true,
2225                         'created' => false,
2226                         'moved' => false,
2227                         'restored' => false,
2228                         'oldrevision' => null,
2229                         'oldcountable' => null
2230                 ];
2231                 $content = $revision->getContent();
2232
2233                 $logger = LoggerFactory::getInstance( 'SaveParse' );
2234
2235                 // See if the parser output before $revision was inserted is still valid
2236                 $editInfo = false;
2237                 if ( !$this->mPreparedEdit ) {
2238                         $logger->debug( __METHOD__ . ": No prepared edit...\n" );
2239                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2240                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision...\n" );
2241                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision-id' )
2242                         && $this->mPreparedEdit->output->getSpeculativeRevIdUsed() !== $revision->getId()
2243                 ) {
2244                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision-id with wrong ID...\n" );
2245                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-user' ) && !$options['changed'] ) {
2246                         $logger->info( __METHOD__ . ": Prepared edit has vary-user and is null...\n" );
2247                 } else {
2248                         wfDebug( __METHOD__ . ": Using prepared edit...\n" );
2249                         $editInfo = $this->mPreparedEdit;
2250                 }
2251
2252                 if ( !$editInfo ) {
2253                         // Parse the text again if needed. Be careful not to do pre-save transform twice:
2254                         // $text is usually already pre-save transformed once. Avoid using the edit stash
2255                         // as any prepared content from there or in doEditContent() was already rejected.
2256                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user, null, false );
2257                 }
2258
2259                 // Save it to the parser cache.
2260                 // Make sure the cache time matches page_touched to avoid double parsing.
2261                 ParserCache::singleton()->save(
2262                         $editInfo->output, $this, $editInfo->popts,
2263                         $revision->getTimestamp(), $editInfo->revid
2264                 );
2265
2266                 // Update the links tables and other secondary data
2267                 if ( $content ) {
2268                         $recursive = $options['changed']; // bug 50785
2269                         $updates = $content->getSecondaryDataUpdates(
2270                                 $this->getTitle(), null, $recursive, $editInfo->output
2271                         );
2272                         foreach ( $updates as $update ) {
2273                                 if ( $update instanceof LinksUpdate ) {
2274                                         $update->setRevision( $revision );
2275                                         $update->setTriggeringUser( $user );
2276                                 }
2277                                 DeferredUpdates::addUpdate( $update );
2278                         }
2279                         if ( $wgRCWatchCategoryMembership
2280                                 && $this->getContentHandler()->supportsCategories() === true
2281                                 && ( $options['changed'] || $options['created'] )
2282                                 && !$options['restored']
2283                         ) {
2284                                 // Note: jobs are pushed after deferred updates, so the job should be able to see
2285                                 // the recent change entry (also done via deferred updates) and carry over any
2286                                 // bot/deletion/IP flags, ect.
2287                                 JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
2288                                         $this->getTitle(),
2289                                         [
2290                                                 'pageId' => $this->getId(),
2291                                                 'revTimestamp' => $revision->getTimestamp()
2292                                         ]
2293                                 ) );
2294                         }
2295                 }
2296
2297                 Hooks::run( 'ArticleEditUpdates', [ &$this, &$editInfo, $options['changed'] ] );
2298
2299                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$this ] ) ) {
2300                         // Flush old entries from the `recentchanges` table
2301                         if ( mt_rand( 0, 9 ) == 0 ) {
2302                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2303                         }
2304                 }
2305
2306                 if ( !$this->exists() ) {
2307                         return;
2308                 }
2309
2310                 $id = $this->getId();
2311                 $title = $this->mTitle->getPrefixedDBkey();
2312                 $shortTitle = $this->mTitle->getDBkey();
2313
2314                 if ( $options['oldcountable'] === 'no-change' ||
2315                         ( !$options['changed'] && !$options['moved'] )
2316                 ) {
2317                         $good = 0;
2318                 } elseif ( $options['created'] ) {
2319                         $good = (int)$this->isCountable( $editInfo );
2320                 } elseif ( $options['oldcountable'] !== null ) {
2321                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2322                 } else {
2323                         $good = 0;
2324                 }
2325                 $edits = $options['changed'] ? 1 : 0;
2326                 $total = $options['created'] ? 1 : 0;
2327
2328                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2329                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2330
2331                 // If this is another user's talk page, update newtalk.
2332                 // Don't do this if $options['changed'] = false (null-edits) nor if
2333                 // it's a minor edit and the user doesn't want notifications for those.
2334                 if ( $options['changed']
2335                         && $this->mTitle->getNamespace() == NS_USER_TALK
2336                         && $shortTitle != $user->getTitleKey()
2337                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2338                 ) {
2339                         $recipient = User::newFromName( $shortTitle, false );
2340                         if ( !$recipient ) {
2341                                 wfDebug( __METHOD__ . ": invalid username\n" );
2342                         } else {
2343                                 // Allow extensions to prevent user notification
2344                                 // when a new message is added to their talk page
2345                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$this, $recipient ] ) ) {
2346                                         if ( User::isIP( $shortTitle ) ) {
2347                                                 // An anonymous user
2348                                                 $recipient->setNewtalk( true, $revision );
2349                                         } elseif ( $recipient->isLoggedIn() ) {
2350                                                 $recipient->setNewtalk( true, $revision );
2351                                         } else {
2352                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2353                                         }
2354                                 }
2355                         }
2356                 }
2357
2358                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2359                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2360                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2361                         if ( $msgtext === false || $msgtext === null ) {
2362                                 $msgtext = '';
2363                         }
2364
2365                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2366
2367                         if ( $wgContLang->hasVariants() ) {
2368                                 $wgContLang->updateConversionTable( $this->mTitle );
2369                         }
2370                 }
2371
2372                 if ( $options['created'] ) {
2373                         self::onArticleCreate( $this->mTitle );
2374                 } elseif ( $options['changed'] ) { // bug 50785
2375                         self::onArticleEdit( $this->mTitle, $revision );
2376                 }
2377         }
2378
2379         /**
2380          * Edit an article without doing all that other stuff
2381          * The article must already exist; link tables etc
2382          * are not updated, caches are not flushed.
2383          *
2384          * @param Content $content Content submitted
2385          * @param User $user The relevant user
2386          * @param string $comment Comment submitted
2387          * @param bool $minor Whereas it's a minor modification
2388          * @param string $serialFormat Format for storing the content in the database
2389          */
2390         public function doQuickEditContent(
2391                 Content $content, User $user, $comment = '', $minor = false, $serialFormat = null
2392         ) {
2393
2394                 $serialized = $content->serialize( $serialFormat );
2395
2396                 $dbw = wfGetDB( DB_MASTER );
2397                 $revision = new Revision( [
2398                         'title'      => $this->getTitle(), // for determining the default content model
2399                         'page'       => $this->getId(),
2400                         'user_text'  => $user->getName(),
2401                         'user'       => $user->getId(),
2402                         'text'       => $serialized,
2403                         'length'     => $content->getSize(),
2404                         'comment'    => $comment,
2405                         'minor_edit' => $minor ? 1 : 0,
2406                 ] ); // XXX: set the content object?
2407                 $revision->insertOn( $dbw );
2408                 $this->updateRevisionOn( $dbw, $revision );
2409
2410                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
2411
2412         }
2413
2414         /**
2415          * Update the article's restriction field, and leave a log entry.
2416          * This works for protection both existing and non-existing pages.
2417          *
2418          * @param array $limit Set of restriction keys
2419          * @param array $expiry Per restriction type expiration
2420          * @param int &$cascade Set to false if cascading protection isn't allowed.
2421          * @param string $reason
2422          * @param User $user The user updating the restrictions
2423          * @param string|string[] $tags Change tags to add to the pages and protection log entries
2424          *   ($user should be able to add the specified tags before this is called)
2425          * @return Status Status object; if action is taken, $status->value is the log_id of the
2426          *   protection log entry.
2427          */
2428         public function doUpdateRestrictions( array $limit, array $expiry,
2429                 &$cascade, $reason, User $user, $tags = null
2430         ) {
2431                 global $wgCascadingRestrictionLevels, $wgContLang;
2432
2433                 if ( wfReadOnly() ) {
2434                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2435                 }
2436
2437                 $this->loadPageData( 'fromdbmaster' );
2438                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2439                 $id = $this->getId();
2440
2441                 if ( !$cascade ) {
2442                         $cascade = false;
2443                 }
2444
2445                 // Take this opportunity to purge out expired restrictions
2446                 Title::purgeExpiredRestrictions();
2447
2448                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2449                 // we expect a single selection, but the schema allows otherwise.
2450                 $isProtected = false;
2451                 $protect = false;
2452                 $changed = false;
2453
2454                 $dbw = wfGetDB( DB_MASTER );
2455
2456                 foreach ( $restrictionTypes as $action ) {
2457                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2458                                 $expiry[$action] = 'infinity';
2459                         }
2460                         if ( !isset( $limit[$action] ) ) {
2461                                 $limit[$action] = '';
2462                         } elseif ( $limit[$action] != '' ) {
2463                                 $protect = true;
2464                         }
2465
2466                         // Get current restrictions on $action
2467                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2468                         if ( $current != '' ) {
2469                                 $isProtected = true;
2470                         }
2471
2472                         if ( $limit[$action] != $current ) {
2473                                 $changed = true;
2474                         } elseif ( $limit[$action] != '' ) {
2475                                 // Only check expiry change if the action is actually being
2476                                 // protected, since expiry does nothing on an not-protected
2477                                 // action.
2478                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2479                                         $changed = true;
2480                                 }
2481                         }
2482                 }
2483
2484                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2485                         $changed = true;
2486                 }
2487
2488                 // If nothing has changed, do nothing
2489                 if ( !$changed ) {
2490                         return Status::newGood();
2491                 }
2492
2493                 if ( !$protect ) { // No protection at all means unprotection
2494                         $revCommentMsg = 'unprotectedarticle';
2495                         $logAction = 'unprotect';
2496                 } elseif ( $isProtected ) {
2497                         $revCommentMsg = 'modifiedarticleprotection';
2498                         $logAction = 'modify';
2499                 } else {
2500                         $revCommentMsg = 'protectedarticle';
2501                         $logAction = 'protect';
2502                 }
2503
2504                 // Truncate for whole multibyte characters
2505                 $reason = $wgContLang->truncate( $reason, 255 );
2506
2507                 $logRelationsValues = [];
2508                 $logRelationsField = null;
2509                 $logParamsDetails = [];
2510
2511                 // Null revision (used for change tag insertion)
2512                 $nullRevision = null;
2513
2514                 if ( $id ) { // Protection of existing page
2515                         if ( !Hooks::run( 'ArticleProtect', [ &$this, &$user, $limit, $reason ] ) ) {
2516                                 return Status::newGood();
2517                         }
2518
2519                         // Only certain restrictions can cascade...
2520                         $editrestriction = isset( $limit['edit'] )
2521                                 ? [ $limit['edit'] ]
2522                                 : $this->mTitle->getRestrictions( 'edit' );
2523                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2524                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2525                         }
2526                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2527                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2528                         }
2529
2530                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2531                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2532                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2533                         }
2534                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2535                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2536                         }
2537
2538                         // The schema allows multiple restrictions
2539                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2540                                 $cascade = false;
2541                         }
2542
2543                         // insert null revision to identify the page protection change as edit summary
2544                         $latest = $this->getLatest();
2545                         $nullRevision = $this->insertProtectNullRevision(
2546                                 $revCommentMsg,
2547                                 $limit,
2548                                 $expiry,
2549                                 $cascade,
2550                                 $reason,
2551                                 $user
2552                         );
2553
2554                         if ( $nullRevision === null ) {
2555                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2556                         }
2557
2558                         $logRelationsField = 'pr_id';
2559
2560                         // Update restrictions table
2561                         foreach ( $limit as $action => $restrictions ) {
2562                                 $dbw->delete(
2563                                         'page_restrictions',
2564                                         [
2565                                                 'pr_page' => $id,
2566                                                 'pr_type' => $action
2567                                         ],
2568                                         __METHOD__
2569                                 );
2570                                 if ( $restrictions != '' ) {
2571                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2572                                         $dbw->insert(
2573                                                 'page_restrictions',
2574                                                 [
2575                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2576                                                         'pr_page' => $id,
2577                                                         'pr_type' => $action,
2578                                                         'pr_level' => $restrictions,
2579                                                         'pr_cascade' => $cascadeValue,
2580                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2581                                                 ],
2582                                                 __METHOD__
2583                                         );
2584                                         $logRelationsValues[] = $dbw->insertId();
2585                                         $logParamsDetails[] = [
2586                                                 'type' => $action,
2587                                                 'level' => $restrictions,
2588                                                 'expiry' => $expiry[$action],
2589                                                 'cascade' => (bool)$cascadeValue,
2590                                         ];
2591                                 }
2592                         }
2593
2594                         // Clear out legacy restriction fields
2595                         $dbw->update(
2596                                 'page',
2597                                 [ 'page_restrictions' => '' ],
2598                                 [ 'page_id' => $id ],
2599                                 __METHOD__
2600                         );
2601
2602                         Hooks::run( 'NewRevisionFromEditComplete',
2603                                 [ $this, $nullRevision, $latest, $user ] );
2604                         Hooks::run( 'ArticleProtectComplete', [ &$this, &$user, $limit, $reason ] );
2605                 } else { // Protection of non-existing page (also known as "title protection")
2606                         // Cascade protection is meaningless in this case
2607                         $cascade = false;
2608
2609                         if ( $limit['create'] != '' ) {
2610                                 $dbw->replace( 'protected_titles',
2611                                         [ [ 'pt_namespace', 'pt_title' ] ],
2612                                         [
2613                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2614                                                 'pt_title' => $this->mTitle->getDBkey(),
2615                                                 'pt_create_perm' => $limit['create'],
2616                                                 'pt_timestamp' => $dbw->timestamp(),
2617                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2618                                                 'pt_user' => $user->getId(),
2619                                                 'pt_reason' => $reason,
2620                                         ], __METHOD__
2621                                 );
2622                                 $logParamsDetails[] = [
2623                                         'type' => 'create',
2624                                         'level' => $limit['create'],
2625                                         'expiry' => $expiry['create'],
2626                                 ];
2627                         } else {
2628                                 $dbw->delete( 'protected_titles',
2629                                         [
2630                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2631                                                 'pt_title' => $this->mTitle->getDBkey()
2632                                         ], __METHOD__
2633                                 );
2634                         }
2635                 }
2636
2637                 $this->mTitle->flushRestrictions();
2638                 InfoAction::invalidateCache( $this->mTitle );
2639
2640                 if ( $logAction == 'unprotect' ) {
2641                         $params = [];
2642                 } else {
2643                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2644                         $params = [
2645                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2646                                 '5:bool:cascade' => $cascade,
2647                                 'details' => $logParamsDetails, // parameter for localize and api
2648                         ];
2649                 }
2650
2651                 // Update the protection log
2652                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2653                 $logEntry->setTarget( $this->mTitle );
2654                 $logEntry->setComment( $reason );
2655                 $logEntry->setPerformer( $user );
2656                 $logEntry->setParameters( $params );
2657                 if ( !is_null( $nullRevision ) ) {
2658                         $logEntry->setAssociatedRevId( $nullRevision->getId() );
2659                 }
2660                 $logEntry->setTags( $tags );
2661                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2662                         $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
2663                 }
2664                 $logId = $logEntry->insert();
2665                 $logEntry->publish( $logId );
2666
2667                 return Status::newGood( $logId );
2668         }
2669
2670         /**
2671          * Insert a new null revision for this page.
2672          *
2673          * @param string $revCommentMsg Comment message key for the revision
2674          * @param array $limit Set of restriction keys
2675          * @param array $expiry Per restriction type expiration
2676          * @param int $cascade Set to false if cascading protection isn't allowed.
2677          * @param string $reason
2678          * @param User|null $user
2679          * @return Revision|null Null on error
2680          */
2681         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2682                 array $expiry, $cascade, $reason, $user = null
2683         ) {
2684                 global $wgContLang;
2685                 $dbw = wfGetDB( DB_MASTER );
2686
2687                 // Prepare a null revision to be added to the history
2688                 $editComment = $wgContLang->ucfirst(
2689                         wfMessage(
2690                                 $revCommentMsg,
2691                                 $this->mTitle->getPrefixedText()
2692                         )->inContentLanguage()->text()
2693                 );
2694                 if ( $reason ) {
2695                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2696                 }
2697                 $protectDescription = $this->protectDescription( $limit, $expiry );
2698                 if ( $protectDescription ) {
2699                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2700                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2701                                 ->inContentLanguage()->text();
2702                 }
2703                 if ( $cascade ) {
2704                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2705                         $editComment .= wfMessage( 'brackets' )->params(
2706                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2707                         )->inContentLanguage()->text();
2708                 }
2709
2710                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2711                 if ( $nullRev ) {
2712                         $nullRev->insertOn( $dbw );
2713
2714                         // Update page record and touch page
2715                         $oldLatest = $nullRev->getParentId();
2716                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2717                 }
2718
2719                 return $nullRev;
2720         }
2721
2722         /**
2723          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2724          * @return string
2725          */
2726         protected function formatExpiry( $expiry ) {
2727                 global $wgContLang;
2728
2729                 if ( $expiry != 'infinity' ) {
2730                         return wfMessage(
2731                                 'protect-expiring',
2732                                 $wgContLang->timeanddate( $expiry, false, false ),
2733                                 $wgContLang->date( $expiry, false, false ),
2734                                 $wgContLang->time( $expiry, false, false )
2735                         )->inContentLanguage()->text();
2736                 } else {
2737                         return wfMessage( 'protect-expiry-indefinite' )
2738                                 ->inContentLanguage()->text();
2739                 }
2740         }
2741
2742         /**
2743          * Builds the description to serve as comment for the edit.
2744          *
2745          * @param array $limit Set of restriction keys
2746          * @param array $expiry Per restriction type expiration
2747          * @return string
2748          */
2749         public function protectDescription( array $limit, array $expiry ) {
2750                 $protectDescription = '';
2751
2752                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2753                         # $action is one of $wgRestrictionTypes = [ 'create', 'edit', 'move', 'upload' ].
2754                         # All possible message keys are listed here for easier grepping:
2755                         # * restriction-create
2756                         # * restriction-edit
2757                         # * restriction-move
2758                         # * restriction-upload
2759                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2760                         # $restrictions is one of $wgRestrictionLevels = [ '', 'autoconfirmed', 'sysop' ],
2761                         # with '' filtered out. All possible message keys are listed below:
2762                         # * protect-level-autoconfirmed
2763                         # * protect-level-sysop
2764                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
2765                                 ->inContentLanguage()->text();
2766
2767                         $expiryText = $this->formatExpiry( $expiry[$action] );
2768
2769                         if ( $protectDescription !== '' ) {
2770                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2771                         }
2772                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2773                                 ->params( $actionText, $restrictionsText, $expiryText )
2774                                 ->inContentLanguage()->text();
2775                 }
2776
2777                 return $protectDescription;
2778         }
2779
2780         /**
2781          * Builds the description to serve as comment for the log entry.
2782          *
2783          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2784          * protect description text. Keep them in old format to avoid breaking compatibility.
2785          * TODO: Fix protection log to store structured description and format it on-the-fly.
2786          *
2787          * @param array $limit Set of restriction keys
2788          * @param array $expiry Per restriction type expiration
2789          * @return string
2790          */
2791         public function protectDescriptionLog( array $limit, array $expiry ) {
2792                 global $wgContLang;
2793
2794                 $protectDescriptionLog = '';
2795
2796                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2797                         $expiryText = $this->formatExpiry( $expiry[$action] );
2798                         $protectDescriptionLog .= $wgContLang->getDirMark() .
2799                                 "[$action=$restrictions] ($expiryText)";
2800                 }
2801
2802                 return trim( $protectDescriptionLog );
2803         }
2804
2805         /**
2806          * Take an array of page restrictions and flatten it to a string
2807          * suitable for insertion into the page_restrictions field.
2808          *
2809          * @param string[] $limit
2810          *
2811          * @throws MWException
2812          * @return string
2813          */
2814         protected static function flattenRestrictions( $limit ) {
2815                 if ( !is_array( $limit ) ) {
2816                         throw new MWException( __METHOD__ . ' given non-array restriction set' );
2817                 }
2818
2819                 $bits = [];
2820                 ksort( $limit );
2821
2822                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2823                         $bits[] = "$action=$restrictions";
2824                 }
2825
2826                 return implode( ':', $bits );
2827         }
2828
2829         /**
2830          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2831          * backwards compatibility, if you care about error reporting you should use
2832          * doDeleteArticleReal() instead.
2833          *
2834          * Deletes the article with database consistency, writes logs, purges caches
2835          *
2836          * @param string $reason Delete reason for deletion log
2837          * @param bool $suppress Suppress all revisions and log the deletion in
2838          *        the suppression log instead of the deletion log
2839          * @param int $u1 Unused
2840          * @param bool $u2 Unused
2841          * @param array|string &$error Array of errors to append to
2842          * @param User $user The deleting user
2843          * @return bool True if successful
2844          */
2845         public function doDeleteArticle(
2846                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2847         ) {
2848                 $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
2849                 return $status->isGood();
2850         }
2851
2852         /**
2853          * Back-end article deletion
2854          * Deletes the article with database consistency, writes logs, purges caches
2855          *
2856          * @since 1.19
2857          *
2858          * @param string $reason Delete reason for deletion log
2859          * @param bool $suppress Suppress all revisions and log the deletion in
2860          *   the suppression log instead of the deletion log
2861          * @param int $u1 Unused
2862          * @param bool $u2 Unused
2863          * @param array|string &$error Array of errors to append to
2864          * @param User $user The deleting user
2865          * @return Status Status object; if successful, $status->value is the log_id of the
2866          *   deletion log entry. If the page couldn't be deleted because it wasn't
2867          *   found, $status is a non-fatal 'cannotdelete' error
2868          */
2869         public function doDeleteArticleReal(
2870                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2871         ) {
2872                 global $wgUser, $wgContentHandlerUseDB;
2873
2874                 wfDebug( __METHOD__ . "\n" );
2875
2876                 $status = Status::newGood();
2877
2878                 if ( $this->mTitle->getDBkey() === '' ) {
2879                         $status->error( 'cannotdelete',
2880                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2881                         return $status;
2882                 }
2883
2884                 $user = is_null( $user ) ? $wgUser : $user;
2885                 if ( !Hooks::run( 'ArticleDelete',
2886                         [ &$this, &$user, &$reason, &$error, &$status, $suppress ]
2887                 ) ) {
2888                         if ( $status->isOK() ) {
2889                                 // Hook aborted but didn't set a fatal status
2890                                 $status->fatal( 'delete-hook-aborted' );
2891                         }
2892                         return $status;
2893                 }
2894
2895                 $dbw = wfGetDB( DB_MASTER );
2896                 $dbw->startAtomic( __METHOD__ );
2897
2898                 $this->loadPageData( self::READ_LATEST );
2899                 $id = $this->getId();
2900                 // T98706: lock the page from various other updates but avoid using
2901                 // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2902                 // the revisions queries (which also JOIN on user). Only lock the page
2903                 // row and CAS check on page_latest to see if the trx snapshot matches.
2904                 $lockedLatest = $this->lockAndGetLatest();
2905                 if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
2906                         $dbw->endAtomic( __METHOD__ );
2907                         // Page not there or trx snapshot is stale
2908                         $status->error( 'cannotdelete',
2909                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2910                         return $status;
2911                 }
2912
2913                 // Given the lock above, we can be confident in the title and page ID values
2914                 $namespace = $this->getTitle()->getNamespace();
2915                 $dbKey = $this->getTitle()->getDBkey();
2916
2917                 // At this point we are now comitted to returning an OK
2918                 // status unless some DB query error or other exception comes up.
2919                 // This way callers don't have to call rollback() if $status is bad
2920                 // unless they actually try to catch exceptions (which is rare).
2921
2922                 // we need to remember the old content so we can use it to generate all deletion updates.
2923                 try {
2924                         $content = $this->getContent( Revision::RAW );
2925                 } catch ( Exception $ex ) {
2926                         wfLogWarning( __METHOD__ . ': failed to load content during deletion! '
2927                                 . $ex->getMessage() );
2928
2929                         $content = null;
2930                 }
2931
2932                 // Bitfields to further suppress the content
2933                 if ( $suppress ) {
2934                         $bitfield = 0;
2935                         // This should be 15...
2936                         $bitfield |= Revision::DELETED_TEXT;
2937                         $bitfield |= Revision::DELETED_COMMENT;
2938                         $bitfield |= Revision::DELETED_USER;
2939                         $bitfield |= Revision::DELETED_RESTRICTED;
2940                         $deletionFields = [ $dbw->addQuotes( $bitfield ) . ' AS deleted' ];
2941                 } else {
2942                         $deletionFields = [ 'rev_deleted AS deleted' ];
2943                 }
2944
2945                 // For now, shunt the revision data into the archive table.
2946                 // Text is *not* removed from the text table; bulk storage
2947                 // is left intact to avoid breaking block-compression or
2948                 // immutable storage schemes.
2949                 // In the future, we may keep revisions and mark them with
2950                 // the rev_deleted field, which is reserved for this purpose.
2951
2952                 // Get all of the page revisions
2953                 $fields = array_diff( Revision::selectFields(), [ 'rev_deleted' ] );
2954                 $res = $dbw->select(
2955                         'revision',
2956                         array_merge( $fields, $deletionFields ),
2957                         [ 'rev_page' => $id ],
2958                         __METHOD__,
2959                         'FOR UPDATE'
2960                 );
2961                 // Build their equivalent archive rows
2962                 $rowsInsert = [];
2963                 foreach ( $res as $row ) {
2964                         $rowInsert = [
2965                                 'ar_namespace'  => $namespace,
2966                                 'ar_title'      => $dbKey,
2967                                 'ar_comment'    => $row->rev_comment,
2968                                 'ar_user'       => $row->rev_user,
2969                                 'ar_user_text'  => $row->rev_user_text,
2970                                 'ar_timestamp'  => $row->rev_timestamp,
2971                                 'ar_minor_edit' => $row->rev_minor_edit,
2972                                 'ar_rev_id'     => $row->rev_id,
2973                                 'ar_parent_id'  => $row->rev_parent_id,
2974                                 'ar_text_id'    => $row->rev_text_id,
2975                                 'ar_text'       => '',
2976                                 'ar_flags'      => '',
2977                                 'ar_len'        => $row->rev_len,
2978                                 'ar_page_id'    => $id,
2979                                 'ar_deleted'    => $row->deleted,
2980                                 'ar_sha1'       => $row->rev_sha1,
2981                         ];
2982                         if ( $wgContentHandlerUseDB ) {
2983                                 $rowInsert['ar_content_model'] = $row->rev_content_model;
2984                                 $rowInsert['ar_content_format'] = $row->rev_content_format;
2985                         }
2986                         $rowsInsert[] = $rowInsert;
2987                 }
2988                 // Copy them into the archive table
2989                 $dbw->insert( 'archive', $rowsInsert, __METHOD__ );
2990                 // Save this so we can pass it to the ArticleDeleteComplete hook.
2991                 $archivedRevisionCount = $dbw->affectedRows();
2992
2993                 // Clone the title and wikiPage, so we have the information we need when
2994                 // we log and run the ArticleDeleteComplete hook.
2995                 $logTitle = clone $this->mTitle;
2996                 $wikiPageBeforeDelete = clone $this;
2997
2998                 // Now that it's safely backed up, delete it
2999                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
3000
3001                 if ( !$dbw->cascadingDeletes() ) {
3002                         $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
3003                 }
3004
3005                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
3006                 $logtype = $suppress ? 'suppress' : 'delete';
3007
3008                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
3009                 $logEntry->setPerformer( $user );
3010                 $logEntry->setTarget( $logTitle );
3011                 $logEntry->setComment( $reason );
3012                 $logid = $logEntry->insert();
3013
3014                 $dbw->onTransactionPreCommitOrIdle( function () use ( $dbw, $logEntry, $logid ) {
3015                         // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
3016                         $logEntry->publish( $logid );
3017                 } );
3018
3019                 $dbw->endAtomic( __METHOD__ );
3020
3021                 $this->doDeleteUpdates( $id, $content );
3022
3023                 Hooks::run( 'ArticleDeleteComplete', [
3024                         &$wikiPageBeforeDelete,
3025                         &$user,
3026                         $reason,
3027                         $id,
3028                         $content,
3029                         $logEntry,
3030                         $archivedRevisionCount
3031                 ] );
3032                 $status->value = $logid;
3033
3034                 // Show log excerpt on 404 pages rather than just a link
3035                 $cache = ObjectCache::getMainStashInstance();
3036                 $key = wfMemcKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
3037                 $cache->set( $key, 1, $cache::TTL_DAY );
3038
3039                 return $status;
3040         }
3041
3042         /**
3043          * Lock the page row for this title+id and return page_latest (or 0)
3044          *
3045          * @return integer Returns 0 if no row was found with this title+id
3046          * @since 1.27
3047          */
3048         public function lockAndGetLatest() {
3049                 return (int)wfGetDB( DB_MASTER )->selectField(
3050                         'page',
3051                         'page_latest',
3052                         [
3053                                 'page_id' => $this->getId(),
3054                                 // Typically page_id is enough, but some code might try to do
3055                                 // updates assuming the title is the same, so verify that
3056                                 'page_namespace' => $this->getTitle()->getNamespace(),
3057                                 'page_title' => $this->getTitle()->getDBkey()
3058                         ],
3059                         __METHOD__,
3060                         [ 'FOR UPDATE' ]
3061                 );
3062         }
3063
3064         /**
3065          * Do some database updates after deletion
3066          *
3067          * @param int $id The page_id value of the page being deleted
3068          * @param Content $content Optional page content to be used when determining
3069          *   the required updates. This may be needed because $this->getContent()
3070          *   may already return null when the page proper was deleted.
3071          */
3072         public function doDeleteUpdates( $id, Content $content = null ) {
3073                 try {
3074                         $countable = $this->isCountable();
3075                 } catch ( Exception $ex ) {
3076                         // fallback for deleting broken pages for which we cannot load the content for
3077                         // some reason. Note that doDeleteArticleReal() already logged this problem.
3078                         $countable = false;
3079                 }
3080
3081                 // Update site status
3082                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$countable, -1 ) );
3083
3084                 // Delete pagelinks, update secondary indexes, etc
3085                 $updates = $this->getDeletionUpdates( $content );
3086                 foreach ( $updates as $update ) {
3087                         DeferredUpdates::addUpdate( $update );
3088                 }
3089
3090                 // Reparse any pages transcluding this page
3091                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
3092
3093                 // Reparse any pages including this image
3094                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
3095                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
3096                 }
3097
3098                 // Clear caches
3099                 WikiPage::onArticleDelete( $this->mTitle );
3100
3101                 // Reset this object and the Title object
3102                 $this->loadFromRow( false, self::READ_LATEST );
3103
3104                 // Search engine
3105                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
3106         }
3107
3108         /**
3109          * Roll back the most recent consecutive set of edits to a page
3110          * from the same user; fails if there are no eligible edits to
3111          * roll back to, e.g. user is the sole contributor. This function
3112          * performs permissions checks on $user, then calls commitRollback()
3113          * to do the dirty work
3114          *
3115          * @todo Separate the business/permission stuff out from backend code
3116          * @todo Remove $token parameter. Already verified by RollbackAction and ApiRollback.
3117          *
3118          * @param string $fromP Name of the user whose edits to rollback.
3119          * @param string $summary Custom summary. Set to default summary if empty.
3120          * @param string $token Rollback token.
3121          * @param bool $bot If true, mark all reverted edits as bot.
3122          *
3123          * @param array $resultDetails Array contains result-specific array of additional values
3124          *    'alreadyrolled' : 'current' (rev)
3125          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3126          *
3127          * @param User $user The user performing the rollback
3128          * @param array|null $tags Change tags to apply to the rollback
3129          * Callers are responsible for permission checks
3130          * (with ChangeTags::canAddTagsAccompanyingChange)
3131          *
3132          * @return array Array of errors, each error formatted as
3133          *   array(messagekey, param1, param2, ...).
3134          * On success, the array is empty.  This array can also be passed to
3135          * OutputPage::showPermissionsErrorPage().
3136          */
3137         public function doRollback(
3138                 $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
3139         ) {
3140                 $resultDetails = null;
3141
3142                 // Check permissions
3143                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
3144                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
3145                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3146
3147                 if ( !$user->matchEditToken( $token, 'rollback' ) ) {
3148                         $errors[] = [ 'sessionfailure' ];
3149                 }
3150
3151                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
3152                         $errors[] = [ 'actionthrottledtext' ];
3153                 }
3154
3155                 // If there were errors, bail out now
3156                 if ( !empty( $errors ) ) {
3157                         return $errors;
3158                 }
3159
3160                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
3161         }
3162
3163         /**
3164          * Backend implementation of doRollback(), please refer there for parameter
3165          * and return value documentation
3166          *
3167          * NOTE: This function does NOT check ANY permissions, it just commits the
3168          * rollback to the DB. Therefore, you should only call this function direct-
3169          * ly if you want to use custom permissions checks. If you don't, use
3170          * doRollback() instead.
3171          * @param string $fromP Name of the user whose edits to rollback.
3172          * @param string $summary Custom summary. Set to default summary if empty.
3173          * @param bool $bot If true, mark all reverted edits as bot.
3174          *
3175          * @param array $resultDetails Contains result-specific array of additional values
3176          * @param User $guser The user performing the rollback
3177          * @param array|null $tags Change tags to apply to the rollback
3178          * Callers are responsible for permission checks
3179          * (with ChangeTags::canAddTagsAccompanyingChange)
3180          *
3181          * @return array
3182          */
3183         public function commitRollback( $fromP, $summary, $bot,
3184                 &$resultDetails, User $guser, $tags = null
3185         ) {
3186                 global $wgUseRCPatrol, $wgContLang;
3187
3188                 $dbw = wfGetDB( DB_MASTER );
3189
3190                 if ( wfReadOnly() ) {
3191                         return [ [ 'readonlytext' ] ];
3192                 }
3193
3194                 // Get the last editor
3195                 $current = $this->getRevision();
3196                 if ( is_null( $current ) ) {
3197                         // Something wrong... no page?
3198                         return [ [ 'notanarticle' ] ];
3199                 }
3200
3201                 $from = str_replace( '_', ' ', $fromP );
3202                 // User name given should match up with the top revision.
3203                 // If the user was deleted then $from should be empty.
3204                 if ( $from != $current->getUserText() ) {
3205                         $resultDetails = [ 'current' => $current ];
3206                         return [ [ 'alreadyrolled',
3207                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3208                                 htmlspecialchars( $fromP ),
3209                                 htmlspecialchars( $current->getUserText() )
3210                         ] ];
3211                 }
3212
3213                 // Get the last edit not by this person...
3214                 // Note: these may not be public values
3215                 $user = intval( $current->getUser( Revision::RAW ) );
3216                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3217                 $s = $dbw->selectRow( 'revision',
3218                         [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
3219                         [ 'rev_page' => $current->getPage(),
3220                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3221                         ], __METHOD__,
3222                         [ 'USE INDEX' => 'page_timestamp',
3223                                 'ORDER BY' => 'rev_timestamp DESC' ]
3224                         );
3225                 if ( $s === false ) {
3226                         // No one else ever edited this page
3227                         return [ [ 'cantrollback' ] ];
3228                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3229                         || $s->rev_deleted & Revision::DELETED_USER
3230                 ) {
3231                         // Only admins can see this text
3232                         return [ [ 'notvisiblerev' ] ];
3233                 }
3234
3235                 // Generate the edit summary if necessary
3236                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3237                 if ( empty( $summary ) ) {
3238                         if ( $from == '' ) { // no public user name
3239                                 $summary = wfMessage( 'revertpage-nouser' );
3240                         } else {
3241                                 $summary = wfMessage( 'revertpage' );
3242                         }
3243                 }
3244
3245                 // Allow the custom summary to use the same args as the default message
3246                 $args = [
3247                         $target->getUserText(), $from, $s->rev_id,
3248                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3249                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3250                 ];
3251                 if ( $summary instanceof Message ) {
3252                         $summary = $summary->params( $args )->inContentLanguage()->text();
3253                 } else {
3254                         $summary = wfMsgReplaceArgs( $summary, $args );
3255                 }
3256
3257                 // Trim spaces on user supplied text
3258                 $summary = trim( $summary );
3259
3260                 // Truncate for whole multibyte characters.
3261                 $summary = $wgContLang->truncate( $summary, 255 );
3262
3263                 // Save
3264                 $flags = EDIT_UPDATE | EDIT_INTERNAL;
3265
3266                 if ( $guser->isAllowed( 'minoredit' ) ) {
3267                         $flags |= EDIT_MINOR;
3268                 }
3269
3270                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3271                         $flags |= EDIT_FORCE_BOT;
3272                 }
3273
3274                 $targetContent = $target->getContent();
3275                 $changingContentModel = $targetContent->getModel() !== $current->getContentModel();
3276
3277                 // Actually store the edit
3278                 $status = $this->doEditContent(
3279                         $targetContent,
3280                         $summary,
3281                         $flags,
3282                         $target->getId(),
3283                         $guser,
3284                         null,
3285                         $tags
3286                 );
3287
3288                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3289                 // This is done even on edit failure to have patrolling in that case (bug 62157).
3290                 $set = [];
3291                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3292                         // Mark all reverted edits as bot
3293                         $set['rc_bot'] = 1;
3294                 }
3295
3296                 if ( $wgUseRCPatrol ) {
3297                         // Mark all reverted edits as patrolled
3298                         $set['rc_patrolled'] = 1;
3299                 }
3300
3301                 if ( count( $set ) ) {
3302                         $dbw->update( 'recentchanges', $set,
3303                                 [ /* WHERE */
3304                                         'rc_cur_id' => $current->getPage(),
3305                                         'rc_user_text' => $current->getUserText(),
3306                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3307                                 ],
3308                                 __METHOD__
3309                         );
3310                 }
3311
3312                 if ( !$status->isOK() ) {
3313                         return $status->getErrorsArray();
3314                 }
3315
3316                 // raise error, when the edit is an edit without a new version
3317                 $statusRev = isset( $status->value['revision'] )
3318                         ? $status->value['revision']
3319                         : null;
3320                 if ( !( $statusRev instanceof Revision ) ) {
3321                         $resultDetails = [ 'current' => $current ];
3322                         return [ [ 'alreadyrolled',
3323                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3324                                         htmlspecialchars( $fromP ),
3325                                         htmlspecialchars( $current->getUserText() )
3326                         ] ];
3327                 }
3328
3329                 if ( $changingContentModel ) {
3330                         // If the content model changed during the rollback,
3331                         // make sure it gets logged to Special:Log/contentmodel
3332                         $log = new ManualLogEntry( 'contentmodel', 'change' );
3333                         $log->setPerformer( $guser );
3334                         $log->setTarget( $this->mTitle );
3335                         $log->setComment( $summary );
3336                         $log->setParameters( [
3337                                 '4::oldmodel' => $current->getContentModel(),
3338                                 '5::newmodel' => $targetContent->getModel(),
3339                         ] );
3340
3341                         $logId = $log->insert( $dbw );
3342                         $log->publish( $logId );
3343                 }
3344
3345                 $revId = $statusRev->getId();
3346
3347                 Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );
3348
3349                 $resultDetails = [
3350                         'summary' => $summary,
3351                         'current' => $current,
3352                         'target' => $target,
3353                         'newid' => $revId
3354                 ];
3355
3356                 return [];
3357         }
3358
3359         /**
3360          * The onArticle*() functions are supposed to be a kind of hooks
3361          * which should be called whenever any of the specified actions
3362          * are done.
3363          *
3364          * This is a good place to put code to clear caches, for instance.
3365          *
3366          * This is called on page move and undelete, as well as edit
3367          *
3368          * @param Title $title
3369          */
3370         public static function onArticleCreate( Title $title ) {
3371                 // Update existence markers on article/talk tabs...
3372                 $other = $title->getOtherPage();
3373
3374                 $other->purgeSquid();
3375
3376                 $title->touchLinks();
3377                 $title->purgeSquid();
3378                 $title->deleteTitleProtection();
3379
3380                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3381
3382                 if ( $title->getNamespace() == NS_CATEGORY ) {
3383                         // Load the Category object, which will schedule a job to create
3384                         // the category table row if necessary. Checking a replica DB is ok
3385                         // here, in the worst case it'll run an unnecessary recount job on
3386                         // a category that probably doesn't have many members.
3387                         Category::newFromTitle( $title )->getID();
3388                 }
3389         }
3390
3391         /**
3392          * Clears caches when article is deleted
3393          *
3394          * @param Title $title
3395          */
3396         public static function onArticleDelete( Title $title ) {
3397                 global $wgContLang;
3398
3399                 // Update existence markers on article/talk tabs...
3400                 $other = $title->getOtherPage();
3401
3402                 $other->purgeSquid();
3403
3404                 $title->touchLinks();
3405                 $title->purgeSquid();
3406
3407                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3408
3409                 // File cache
3410                 HTMLFileCache::clearFileCache( $title );
3411                 InfoAction::invalidateCache( $title );
3412
3413                 // Messages
3414                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3415                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3416
3417                         if ( $wgContLang->hasVariants() ) {
3418                                 $wgContLang->updateConversionTable( $title );
3419                         }
3420                 }
3421
3422                 // Images
3423                 if ( $title->getNamespace() == NS_FILE ) {
3424                         DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
3425                 }
3426
3427                 // User talk pages
3428                 if ( $title->getNamespace() == NS_USER_TALK ) {
3429                         $user = User::newFromName( $title->getText(), false );
3430                         if ( $user ) {
3431                                 $user->setNewtalk( false );
3432                         }
3433                 }
3434
3435                 // Image redirects
3436                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3437         }
3438
3439         /**
3440          * Purge caches on page update etc
3441          *
3442          * @param Title $title
3443          * @param Revision|null $revision Revision that was just saved, may be null
3444          */
3445         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3446                 // Invalidate caches of articles which include this page
3447                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3448
3449                 // Invalidate the caches of all pages which redirect here
3450                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
3451
3452                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3453
3454                 // Purge CDN for this page only
3455                 $title->purgeSquid();
3456                 // Clear file cache for this page only
3457                 HTMLFileCache::clearFileCache( $title );
3458
3459                 $revid = $revision ? $revision->getId() : null;
3460                 DeferredUpdates::addCallableUpdate( function() use ( $title, $revid ) {
3461                         InfoAction::invalidateCache( $title, $revid );
3462                 } );
3463         }
3464
3465         /**#@-*/
3466
3467         /**
3468          * Returns a list of categories this page is a member of.
3469          * Results will include hidden categories
3470          *
3471          * @return TitleArray
3472          */
3473         public function getCategories() {
3474                 $id = $this->getId();
3475                 if ( $id == 0 ) {
3476                         return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
3477                 }
3478
3479                 $dbr = wfGetDB( DB_REPLICA );
3480                 $res = $dbr->select( 'categorylinks',
3481                         [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
3482                         // Have to do that since DatabaseBase::fieldNamesWithAlias treats numeric indexes
3483                         // as not being aliases, and NS_CATEGORY is numeric
3484                         [ 'cl_from' => $id ],
3485                         __METHOD__ );
3486
3487                 return TitleArray::newFromResult( $res );
3488         }
3489
3490         /**
3491          * Returns a list of hidden categories this page is a member of.
3492          * Uses the page_props and categorylinks tables.
3493          *
3494          * @return array Array of Title objects
3495          */
3496         public function getHiddenCategories() {
3497                 $result = [];
3498                 $id = $this->getId();
3499
3500                 if ( $id == 0 ) {
3501                         return [];
3502                 }
3503
3504                 $dbr = wfGetDB( DB_REPLICA );
3505                 $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
3506                         [ 'cl_to' ],
3507                         [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3508                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
3509                         __METHOD__ );
3510
3511                 if ( $res !== false ) {
3512                         foreach ( $res as $row ) {
3513                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3514                         }
3515                 }
3516
3517                 return $result;
3518         }
3519
3520         /**
3521          * Return an applicable autosummary if one exists for the given edit.
3522          * @param string|null $oldtext The previous text of the page.
3523          * @param string|null $newtext The submitted text of the page.
3524          * @param int $flags Bitmask: a bitmask of flags submitted for the edit.
3525          * @return string An appropriate autosummary, or an empty string.
3526          *
3527          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3528          */
3529         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3530                 // NOTE: stub for backwards-compatibility. assumes the given text is
3531                 // wikitext. will break horribly if it isn't.
3532
3533                 ContentHandler::deprecated( __METHOD__, '1.21' );
3534
3535                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3536                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3537                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3538
3539                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3540         }
3541
3542         /**
3543          * Auto-generates a deletion reason
3544          *
3545          * @param bool &$hasHistory Whether the page has a history
3546          * @return string|bool String containing deletion reason or empty string, or boolean false
3547          *    if no revision occurred
3548          */
3549         public function getAutoDeleteReason( &$hasHistory ) {
3550                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3551         }
3552
3553         /**
3554          * Update all the appropriate counts in the category table, given that
3555          * we've added the categories $added and deleted the categories $deleted.
3556          *
3557          * @param array $added The names of categories that were added
3558          * @param array $deleted The names of categories that were deleted
3559          * @param integer $id Page ID (this should be the original deleted page ID)
3560          */
3561         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
3562                 $id = $id ?: $this->getId();
3563                 $dbw = wfGetDB( DB_MASTER );
3564                 $method = __METHOD__;
3565                 // Do this at the end of the commit to reduce lock wait timeouts
3566                 $dbw->onTransactionPreCommitOrIdle(
3567                         function () use ( $dbw, $added, $deleted, $id, $method ) {
3568                                 $ns = $this->getTitle()->getNamespace();
3569
3570                                 $addFields = [ 'cat_pages = cat_pages + 1' ];
3571                                 $removeFields = [ 'cat_pages = cat_pages - 1' ];
3572                                 if ( $ns == NS_CATEGORY ) {
3573                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3574                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3575                                 } elseif ( $ns == NS_FILE ) {
3576                                         $addFields[] = 'cat_files = cat_files + 1';
3577                                         $removeFields[] = 'cat_files = cat_files - 1';
3578                                 }
3579
3580                                 if ( count( $added ) ) {
3581                                         $existingAdded = $dbw->selectFieldValues(
3582                                                 'category',
3583                                                 'cat_title',
3584                                                 [ 'cat_title' => $added ],
3585                                                 $method
3586                                         );
3587
3588                                         // For category rows that already exist, do a plain
3589                                         // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
3590                                         // to avoid creating gaps in the cat_id sequence.
3591                                         if ( count( $existingAdded ) ) {
3592                                                 $dbw->update(
3593                                                         'category',
3594                                                         $addFields,
3595                                                         [ 'cat_title' => $existingAdded ],
3596                                                         $method
3597                                                 );
3598                                         }
3599
3600                                         $missingAdded = array_diff( $added, $existingAdded );
3601                                         if ( count( $missingAdded ) ) {
3602                                                 $insertRows = [];
3603                                                 foreach ( $missingAdded as $cat ) {
3604                                                         $insertRows[] = [
3605                                                                 'cat_title'   => $cat,
3606                                                                 'cat_pages'   => 1,
3607                                                                 'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3608                                                                 'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3609                                                         ];
3610                                                 }
3611                                                 $dbw->upsert(
3612                                                         'category',
3613                                                         $insertRows,
3614                                                         [ 'cat_title' ],
3615                                                         $addFields,
3616                                                         $method
3617                                                 );
3618                                         }
3619                                 }
3620
3621                                 if ( count( $deleted ) ) {
3622                                         $dbw->update(
3623                                                 'category',
3624                                                 $removeFields,
3625                                                 [ 'cat_title' => $deleted ],
3626                                                 $method
3627                                         );
3628                                 }
3629
3630                                 foreach ( $added as $catName ) {
3631                                         $cat = Category::newFromName( $catName );
3632                                         Hooks::run( 'CategoryAfterPageAdded', [ $cat, $this ] );
3633                                 }
3634
3635                                 foreach ( $deleted as $catName ) {
3636                                         $cat = Category::newFromName( $catName );
3637                                         Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $this, $id ] );
3638                                 }
3639
3640                                 // Refresh counts on categories that should be empty now, to
3641                                 // trigger possible deletion. Check master for the most
3642                                 // up-to-date cat_pages.
3643                                 if ( count( $deleted ) ) {
3644                                         $rows = $dbw->select(
3645                                                 'category',
3646                                                 [ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ],
3647                                                 [ 'cat_title' => $deleted, 'cat_pages <= 0' ],
3648                                                 $method
3649                                         );
3650                                         foreach ( $rows as $row ) {
3651                                                 $cat = Category::newFromRow( $row );
3652                                                 $cat->refreshCounts();
3653                                         }
3654                                 }
3655                         }
3656                 );
3657         }
3658
3659         /**
3660          * Opportunistically enqueue link update jobs given fresh parser output if useful
3661          *
3662          * @param ParserOutput $parserOutput Current version page output
3663          * @since 1.25
3664          */
3665         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3666                 if ( wfReadOnly() ) {
3667                         return;
3668                 }
3669
3670                 if ( !Hooks::run( 'OpportunisticLinksUpdate',
3671                         [ $this, $this->mTitle, $parserOutput ]
3672                 ) ) {
3673                         return;
3674                 }
3675
3676                 $config = RequestContext::getMain()->getConfig();
3677
3678                 $params = [
3679                         'isOpportunistic' => true,
3680                         'rootJobTimestamp' => $parserOutput->getCacheTime()
3681                 ];
3682
3683                 if ( $this->mTitle->areRestrictionsCascading() ) {
3684                         // If the page is cascade protecting, the links should really be up-to-date
3685                         JobQueueGroup::singleton()->lazyPush(
3686                                 RefreshLinksJob::newPrioritized( $this->mTitle, $params )
3687                         );
3688                 } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
3689                         // Assume the output contains "dynamic" time/random based magic words.
3690                         // Only update pages that expired due to dynamic content and NOT due to edits
3691                         // to referenced templates/files. When the cache expires due to dynamic content,
3692                         // page_touched is unchanged. We want to avoid triggering redundant jobs due to
3693                         // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
3694                         // template/file edit already triggered recursive RefreshLinksJob jobs.
3695                         if ( $this->getLinksTimestamp() > $this->getTouched() ) {
3696                                 // If a page is uncacheable, do not keep spamming a job for it.
3697                                 // Although it would be de-duplicated, it would still waste I/O.
3698                                 $cache = ObjectCache::getLocalClusterInstance();
3699                                 $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
3700                                 $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
3701                                 if ( $cache->add( $key, time(), $ttl ) ) {
3702                                         JobQueueGroup::singleton()->lazyPush(
3703                                                 RefreshLinksJob::newDynamic( $this->mTitle, $params )
3704                                         );
3705                                 }
3706                         }
3707                 }
3708         }
3709
3710         /**
3711          * Returns a list of updates to be performed when this page is deleted. The
3712          * updates should remove any information about this page from secondary data
3713          * stores such as links tables.
3714          *
3715          * @param Content|null $content Optional Content object for determining the
3716          *   necessary updates.
3717          * @return DataUpdate[]
3718          */
3719         public function getDeletionUpdates( Content $content = null ) {
3720                 if ( !$content ) {
3721                         // load content object, which may be used to determine the necessary updates.
3722                         // XXX: the content may not be needed to determine the updates.
3723                         try {
3724                                 $content = $this->getContent( Revision::RAW );
3725                         } catch ( Exception $ex ) {
3726                                 // If we can't load the content, something is wrong. Perhaps that's why
3727                                 // the user is trying to delete the page, so let's not fail in that case.
3728                                 // Note that doDeleteArticleReal() will already have logged an issue with
3729                                 // loading the content.
3730                         }
3731                 }
3732
3733                 if ( !$content ) {
3734                         $updates = [];
3735                 } else {
3736                         $updates = $content->getDeletionUpdates( $this );
3737                 }
3738
3739                 Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
3740                 return $updates;
3741         }
3742 }