includes/page/WikiPage.php

   1 <?php
   2 /**
   3  * Base representation for a MediaWiki page.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use \MediaWiki\Logger\LoggerFactory;
  24 use \MediaWiki\MediaWikiServices;
  25
  26 /**
  27  * Class representing a MediaWiki article and history.
  28  *
  29  * Some fields are public only for backwards-compatibility. Use accessors.
  30  * In the past, this class was part of Article.php and everything was public.
  31  */
  32 class WikiPage implements Page, IDBAccessObject {
  33         // Constants for $mDataLoadedFrom and related
  34
  35         /**
  36          * @var Title
  37          */
  38         public $mTitle = null;
  39
  40         /**@{{
  41          * @protected
  42          */
  43         public $mDataLoaded = false;         // !< Boolean
  44         public $mIsRedirect = false;         // !< Boolean
  45         public $mLatest = false;             // !< Integer (false means "not loaded")
  46         /**@}}*/
  47
  48         /** @var stdClass Map of cache fields (text, parser output, ect) for a proposed/new edit */
  49         public $mPreparedEdit = false;
  50
  51         /**
  52          * @var int
  53          */
  54         protected $mId = null;
  55
  56         /**
  57          * @var int One of the READ_* constants
  58          */
  59         protected $mDataLoadedFrom = self::READ_NONE;
  60
  61         /**
  62          * @var Title
  63          */
  64         protected $mRedirectTarget = null;
  65
  66         /**
  67          * @var Revision
  68          */
  69         protected $mLastRevision = null;
  70
  71         /**
  72          * @var string Timestamp of the current revision or empty string if not loaded
  73          */
  74         protected $mTimestamp = '';
  75
  76         /**
  77          * @var string
  78          */
  79         protected $mTouched = '19700101000000';
  80
  81         /**
  82          * @var string
  83          */
  84         protected $mLinksUpdated = '19700101000000';
  85
  86         const PURGE_CDN_CACHE = 1; // purge CDN cache for page variant URLs
  87         const PURGE_CLUSTER_PCACHE = 2; // purge parser cache in the local datacenter
  88         const PURGE_GLOBAL_PCACHE = 4; // set page_touched to clear parser cache in all datacenters
  89         const PURGE_ALL = 7;
  90
  91         /**
  92          * Constructor and clear the article
  93          * @param Title $title Reference to a Title object.
  94          */
  95         public function __construct( Title $title ) {
  96                 $this->mTitle = $title;
  97         }
  98
  99         /**
 100          * Makes sure that the mTitle object is cloned
 101          * to the newly cloned WikiPage.
 102          */
 103         public function __clone() {
 104                 $this->mTitle = clone $this->mTitle;
 105         }
 106
 107         /**
 108          * Create a WikiPage object of the appropriate class for the given title.
 109          *
 110          * @param Title $title
 111          *
 112          * @throws MWException
 113          * @return WikiPage|WikiCategoryPage|WikiFilePage
 114          */
 115         public static function factory( Title $title ) {
 116                 $ns = $title->getNamespace();
 117
 118                 if ( $ns == NS_MEDIA ) {
 119                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 120                 } elseif ( $ns < 0 ) {
 121                         throw new MWException( "Invalid or virtual namespace $ns given." );
 122                 }
 123
 124                 switch ( $ns ) {
 125                         case NS_FILE:
 126                                 $page = new WikiFilePage( $title );
 127                                 break;
 128                         case NS_CATEGORY:
 129                                 $page = new WikiCategoryPage( $title );
 130                                 break;
 131                         default:
 132                                 $page = new WikiPage( $title );
 133                 }
 134
 135                 return $page;
 136         }
 137
 138         /**
 139          * Constructor from a page id
 140          *
 141          * @param int $id Article ID to load
 142          * @param string|int $from One of the following values:
 143          *        - "fromdb" or WikiPage::READ_NORMAL to select from a replica DB
 144          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 145          *
 146          * @return WikiPage|null
 147          */
 148         public static function newFromID( $id, $from = 'fromdb' ) {
 149                 // page id's are never 0 or negative, see bug 61166
 150                 if ( $id < 1 ) {
 151                         return null;
 152                 }
 153
 154                 $from = self::convertSelectType( $from );
 155                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_REPLICA );
 156                 $row = $db->selectRow(
 157                         'page', self::selectFields(), [ 'page_id' => $id ], __METHOD__ );
 158                 if ( !$row ) {
 159                         return null;
 160                 }
 161                 return self::newFromRow( $row, $from );
 162         }
 163
 164         /**
 165          * Constructor from a database row
 166          *
 167          * @since 1.20
 168          * @param object $row Database row containing at least fields returned by selectFields().
 169          * @param string|int $from Source of $data:
 170          *        - "fromdb" or WikiPage::READ_NORMAL: from a replica DB
 171          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 172          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 173          * @return WikiPage
 174          */
 175         public static function newFromRow( $row, $from = 'fromdb' ) {
 176                 $page = self::factory( Title::newFromRow( $row ) );
 177                 $page->loadFromRow( $row, $from );
 178                 return $page;
 179         }
 180
 181         /**
 182          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 183          *
 184          * @param object|string|int $type
 185          * @return mixed
 186          */
 187         private static function convertSelectType( $type ) {
 188                 switch ( $type ) {
 189                 case 'fromdb':
 190                         return self::READ_NORMAL;
 191                 case 'fromdbmaster':
 192                         return self::READ_LATEST;
 193                 case 'forupdate':
 194                         return self::READ_LOCKING;
 195                 default:
 196                         // It may already be an integer or whatever else
 197                         return $type;
 198                 }
 199         }
 200
 201         /**
 202          * @todo Move this UI stuff somewhere else
 203          *
 204          * @see ContentHandler::getActionOverrides
 205          */
 206         public function getActionOverrides() {
 207                 return $this->getContentHandler()->getActionOverrides();
 208         }
 209
 210         /**
 211          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 212          *
 213          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 214          *
 215          * @return ContentHandler
 216          *
 217          * @since 1.21
 218          */
 219         public function getContentHandler() {
 220                 return ContentHandler::getForModelID( $this->getContentModel() );
 221         }
 222
 223         /**
 224          * Get the title object of the article
 225          * @return Title Title object of this page
 226          */
 227         public function getTitle() {
 228                 return $this->mTitle;
 229         }
 230
 231         /**
 232          * Clear the object
 233          * @return void
 234          */
 235         public function clear() {
 236                 $this->mDataLoaded = false;
 237                 $this->mDataLoadedFrom = self::READ_NONE;
 238
 239                 $this->clearCacheFields();
 240         }
 241
 242         /**
 243          * Clear the object cache fields
 244          * @return void
 245          */
 246         protected function clearCacheFields() {
 247                 $this->mId = null;
 248                 $this->mRedirectTarget = null; // Title object if set
 249                 $this->mLastRevision = null; // Latest revision
 250                 $this->mTouched = '19700101000000';
 251                 $this->mLinksUpdated = '19700101000000';
 252                 $this->mTimestamp = '';
 253                 $this->mIsRedirect = false;
 254                 $this->mLatest = false;
 255                 // Bug 57026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 256                 // the requested rev ID and content against the cached one for equality. For most
 257                 // content types, the output should not change during the lifetime of this cache.
 258                 // Clearing it can cause extra parses on edit for no reason.
 259         }
 260
 261         /**
 262          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 263          * @return void
 264          * @since 1.23
 265          */
 266         public function clearPreparedEdit() {
 267                 $this->mPreparedEdit = false;
 268         }
 269
 270         /**
 271          * Return the list of revision fields that should be selected to create
 272          * a new page.
 273          *
 274          * @return array
 275          */
 276         public static function selectFields() {
 277                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 278
 279                 $fields = [
 280                         'page_id',
 281                         'page_namespace',
 282                         'page_title',
 283                         'page_restrictions',
 284                         'page_is_redirect',
 285                         'page_is_new',
 286                         'page_random',
 287                         'page_touched',
 288                         'page_links_updated',
 289                         'page_latest',
 290                         'page_len',
 291                 ];
 292
 293                 if ( $wgContentHandlerUseDB ) {
 294                         $fields[] = 'page_content_model';
 295                 }
 296
 297                 if ( $wgPageLanguageUseDB ) {
 298                         $fields[] = 'page_lang';
 299                 }
 300
 301                 return $fields;
 302         }
 303
 304         /**
 305          * Fetch a page record with the given conditions
 306          * @param IDatabase $dbr
 307          * @param array $conditions
 308          * @param array $options
 309          * @return object|bool Database result resource, or false on failure
 310          */
 311         protected function pageData( $dbr, $conditions, $options = [] ) {
 312                 $fields = self::selectFields();
 313
 314                 Hooks::run( 'ArticlePageDataBefore', [ &$this, &$fields ] );
 315
 316                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 317
 318                 Hooks::run( 'ArticlePageDataAfter', [ &$this, &$row ] );
 319
 320                 return $row;
 321         }
 322
 323         /**
 324          * Fetch a page record matching the Title object's namespace and title
 325          * using a sanitized title string
 326          *
 327          * @param IDatabase $dbr
 328          * @param Title $title
 329          * @param array $options
 330          * @return object|bool Database result resource, or false on failure
 331          */
 332         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
 333                 return $this->pageData( $dbr, [
 334                         'page_namespace' => $title->getNamespace(),
 335                         'page_title' => $title->getDBkey() ], $options );
 336         }
 337
 338         /**
 339          * Fetch a page record matching the requested ID
 340          *
 341          * @param IDatabase $dbr
 342          * @param int $id
 343          * @param array $options
 344          * @return object|bool Database result resource, or false on failure
 345          */
 346         public function pageDataFromId( $dbr, $id, $options = [] ) {
 347                 return $this->pageData( $dbr, [ 'page_id' => $id ], $options );
 348         }
 349
 350         /**
 351          * Load the object from a given source by title
 352          *
 353          * @param object|string|int $from One of the following:
 354          *   - A DB query result object.
 355          *   - "fromdb" or WikiPage::READ_NORMAL to get from a replica DB.
 356          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 357          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 358          *     using SELECT FOR UPDATE.
 359          *
 360          * @return void
 361          */
 362         public function loadPageData( $from = 'fromdb' ) {
 363                 $from = self::convertSelectType( $from );
 364                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 365                         // We already have the data from the correct location, no need to load it twice.
 366                         return;
 367                 }
 368
 369                 if ( is_int( $from ) ) {
 370                         list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 371                         $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 372
 373                         if ( !$data
 374                                 && $index == DB_REPLICA
 375                                 && wfGetLB()->getServerCount() > 1
 376                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
 377                         ) {
 378                                 $from = self::READ_LATEST;
 379                                 list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 380                                 $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 381                         }
 382                 } else {
 383                         // No idea from where the caller got this data, assume replica DB.
 384                         $data = $from;
 385                         $from = self::READ_NORMAL;
 386                 }
 387
 388                 $this->loadFromRow( $data, $from );
 389         }
 390
 391         /**
 392          * Load the object from a database row
 393          *
 394          * @since 1.20
 395          * @param object|bool $data DB row containing fields returned by selectFields() or false
 396          * @param string|int $from One of the following:
 397          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a replica DB
 398          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 399          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 400          *          the master DB using SELECT FOR UPDATE
 401          */
 402         public function loadFromRow( $data, $from ) {
 403                 $lc = LinkCache::singleton();
 404                 $lc->clearLink( $this->mTitle );
 405
 406                 if ( $data ) {
 407                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 408
 409                         $this->mTitle->loadFromRow( $data );
 410
 411                         // Old-fashioned restrictions
 412                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 413
 414                         $this->mId = intval( $data->page_id );
 415                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 416                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 417                         $this->mIsRedirect = intval( $data->page_is_redirect );
 418                         $this->mLatest = intval( $data->page_latest );
 419                         // Bug 37225: $latest may no longer match the cached latest Revision object.
 420                         // Double-check the ID of any cached latest Revision object for consistency.
 421                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 422                                 $this->mLastRevision = null;
 423                                 $this->mTimestamp = '';
 424                         }
 425                 } else {
 426                         $lc->addBadLinkObj( $this->mTitle );
 427
 428                         $this->mTitle->loadFromRow( false );
 429
 430                         $this->clearCacheFields();
 431
 432                         $this->mId = 0;
 433                 }
 434
 435                 $this->mDataLoaded = true;
 436                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 437         }
 438
 439         /**
 440          * @return int Page ID
 441          */
 442         public function getId() {
 443                 if ( !$this->mDataLoaded ) {
 444                         $this->loadPageData();
 445                 }
 446                 return $this->mId;
 447         }
 448
 449         /**
 450          * @return bool Whether or not the page exists in the database
 451          */
 452         public function exists() {
 453                 if ( !$this->mDataLoaded ) {
 454                         $this->loadPageData();
 455                 }
 456                 return $this->mId > 0;
 457         }
 458
 459         /**
 460          * Check if this page is something we're going to be showing
 461          * some sort of sensible content for. If we return false, page
 462          * views (plain action=view) will return an HTTP 404 response,
 463          * so spiders and robots can know they're following a bad link.
 464          *
 465          * @return bool
 466          */
 467         public function hasViewableContent() {
 468                 return $this->mTitle->isKnown();
 469         }
 470
 471         /**
 472          * Tests if the article content represents a redirect
 473          *
 474          * @return bool
 475          */
 476         public function isRedirect() {
 477                 if ( !$this->mDataLoaded ) {
 478                         $this->loadPageData();
 479                 }
 480
 481                 return (bool)$this->mIsRedirect;
 482         }
 483
 484         /**
 485          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 486          *
 487          * Will use the revisions actual content model if the page exists,
 488          * and the page's default if the page doesn't exist yet.
 489          *
 490          * @return string
 491          *
 492          * @since 1.21
 493          */
 494         public function getContentModel() {
 495                 if ( $this->exists() ) {
 496                         $cache = ObjectCache::getMainWANInstance();
 497
 498                         return $cache->getWithSetCallback(
 499                                 $cache->makeKey( 'page', 'content-model', $this->getLatest() ),
 500                                 $cache::TTL_MONTH,
 501                                 function () {
 502                                         $rev = $this->getRevision();
 503                                         if ( $rev ) {
 504                                                 // Look at the revision's actual content model
 505                                                 return $rev->getContentModel();
 506                                         } else {
 507                                                 $title = $this->mTitle->getPrefixedDBkey();
 508                                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 509                                                 return $this->mTitle->getContentModel();
 510                                         }
 511                                 }
 512                         );
 513                 }
 514
 515                 // use the default model for this page
 516                 return $this->mTitle->getContentModel();
 517         }
 518
 519         /**
 520          * Loads page_touched and returns a value indicating if it should be used
 521          * @return bool True if this page exists and is not a redirect
 522          */
 523         public function checkTouched() {
 524                 if ( !$this->mDataLoaded ) {
 525                         $this->loadPageData();
 526                 }
 527                 return ( $this->mId && !$this->mIsRedirect );
 528         }
 529
 530         /**
 531          * Get the page_touched field
 532          * @return string Containing GMT timestamp
 533          */
 534         public function getTouched() {
 535                 if ( !$this->mDataLoaded ) {
 536                         $this->loadPageData();
 537                 }
 538                 return $this->mTouched;
 539         }
 540
 541         /**
 542          * Get the page_links_updated field
 543          * @return string|null Containing GMT timestamp
 544          */
 545         public function getLinksTimestamp() {
 546                 if ( !$this->mDataLoaded ) {
 547                         $this->loadPageData();
 548                 }
 549                 return $this->mLinksUpdated;
 550         }
 551
 552         /**
 553          * Get the page_latest field
 554          * @return int The rev_id of current revision
 555          */
 556         public function getLatest() {
 557                 if ( !$this->mDataLoaded ) {
 558                         $this->loadPageData();
 559                 }
 560                 return (int)$this->mLatest;
 561         }
 562
 563         /**
 564          * Get the Revision object of the oldest revision
 565          * @return Revision|null
 566          */
 567         public function getOldestRevision() {
 568
 569                 // Try using the replica DB first, then try the master
 570                 $continue = 2;
 571                 $db = wfGetDB( DB_REPLICA );
 572                 $revSelectFields = Revision::selectFields();
 573
 574                 $row = null;
 575                 while ( $continue ) {
 576                         $row = $db->selectRow(
 577                                 [ 'page', 'revision' ],
 578                                 $revSelectFields,
 579                                 [
 580                                         'page_namespace' => $this->mTitle->getNamespace(),
 581                                         'page_title' => $this->mTitle->getDBkey(),
 582                                         'rev_page = page_id'
 583                                 ],
 584                                 __METHOD__,
 585                                 [
 586                                         'ORDER BY' => 'rev_timestamp ASC'
 587                                 ]
 588                         );
 589
 590                         if ( $row ) {
 591                                 $continue = 0;
 592                         } else {
 593                                 $db = wfGetDB( DB_MASTER );
 594                                 $continue--;
 595                         }
 596                 }
 597
 598                 return $row ? Revision::newFromRow( $row ) : null;
 599         }
 600
 601         /**
 602          * Loads everything except the text
 603          * This isn't necessary for all uses, so it's only done if needed.
 604          */
 605         protected function loadLastEdit() {
 606                 if ( $this->mLastRevision !== null ) {
 607                         return; // already loaded
 608                 }
 609
 610                 $latest = $this->getLatest();
 611                 if ( !$latest ) {
 612                         return; // page doesn't exist or is missing page_latest info
 613                 }
 614
 615                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 616                         // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always
 617                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 618                         // transactions, where S1 normally only sees changes committed before the first S1
 619                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 620                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 621                         // happened after the first S1 SELECT.
 622                         // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
 623                         $flags = Revision::READ_LOCKING;
 624                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 625                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 626                         // Bug T93976: if page_latest was loaded from the master, fetch the
 627                         // revision from there as well, as it may not exist yet on a replica DB.
 628                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 629                         $flags = Revision::READ_LATEST;
 630                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 631                 } else {
 632                         $dbr = wfGetDB( DB_REPLICA );
 633                         $revision = Revision::newKnownCurrent( $dbr, $this->getId(), $latest );
 634                 }
 635
 636                 if ( $revision ) { // sanity
 637                         $this->setLastEdit( $revision );
 638                 }
 639         }
 640
 641         /**
 642          * Set the latest revision
 643          * @param Revision $revision
 644          */
 645         protected function setLastEdit( Revision $revision ) {
 646                 $this->mLastRevision = $revision;
 647                 $this->mTimestamp = $revision->getTimestamp();
 648         }
 649
 650         /**
 651          * Get the latest revision
 652          * @return Revision|null
 653          */
 654         public function getRevision() {
 655                 $this->loadLastEdit();
 656                 if ( $this->mLastRevision ) {
 657                         return $this->mLastRevision;
 658                 }
 659                 return null;
 660         }
 661
 662         /**
 663          * Get the content of the current revision. No side-effects...
 664          *
 665          * @param int $audience One of:
 666          *   Revision::FOR_PUBLIC       to be displayed to all users
 667          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 668          *   Revision::RAW              get the text regardless of permissions
 669          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 670          *   to the $audience parameter
 671          * @return Content|null The content of the current revision
 672          *
 673          * @since 1.21
 674          */
 675         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 676                 $this->loadLastEdit();
 677                 if ( $this->mLastRevision ) {
 678                         return $this->mLastRevision->getContent( $audience, $user );
 679                 }
 680                 return null;
 681         }
 682
 683         /**
 684          * Get the text of the current revision. No side-effects...
 685          *
 686          * @param int $audience One of:
 687          *   Revision::FOR_PUBLIC       to be displayed to all users
 688          *   Revision::FOR_THIS_USER    to be displayed to the given user
 689          *   Revision::RAW              get the text regardless of permissions
 690          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 691          *   to the $audience parameter
 692          * @return string|bool The text of the current revision
 693          * @deprecated since 1.21, getContent() should be used instead.
 694          */
 695         public function getText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 696                 wfDeprecated( __METHOD__, '1.21' );
 697
 698                 $this->loadLastEdit();
 699                 if ( $this->mLastRevision ) {
 700                         return $this->mLastRevision->getText( $audience, $user );
 701                 }
 702                 return false;
 703         }
 704
 705         /**
 706          * @return string MW timestamp of last article revision
 707          */
 708         public function getTimestamp() {
 709                 // Check if the field has been filled by WikiPage::setTimestamp()
 710                 if ( !$this->mTimestamp ) {
 711                         $this->loadLastEdit();
 712                 }
 713
 714                 return wfTimestamp( TS_MW, $this->mTimestamp );
 715         }
 716
 717         /**
 718          * Set the page timestamp (use only to avoid DB queries)
 719          * @param string $ts MW timestamp of last article revision
 720          * @return void
 721          */
 722         public function setTimestamp( $ts ) {
 723                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 724         }
 725
 726         /**
 727          * @param int $audience One of:
 728          *   Revision::FOR_PUBLIC       to be displayed to all users
 729          *   Revision::FOR_THIS_USER    to be displayed to the given user
 730          *   Revision::RAW              get the text regardless of permissions
 731          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 732          *   to the $audience parameter
 733          * @return int User ID for the user that made the last article revision
 734          */
 735         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 736                 $this->loadLastEdit();
 737                 if ( $this->mLastRevision ) {
 738                         return $this->mLastRevision->getUser( $audience, $user );
 739                 } else {
 740                         return -1;
 741                 }
 742         }
 743
 744         /**
 745          * Get the User object of the user who created the page
 746          * @param int $audience One of:
 747          *   Revision::FOR_PUBLIC       to be displayed to all users
 748          *   Revision::FOR_THIS_USER    to be displayed to the given user
 749          *   Revision::RAW              get the text regardless of permissions
 750          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 751          *   to the $audience parameter
 752          * @return User|null
 753          */
 754         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 755                 $revision = $this->getOldestRevision();
 756                 if ( $revision ) {
 757                         $userName = $revision->getUserText( $audience, $user );
 758                         return User::newFromName( $userName, false );
 759                 } else {
 760                         return null;
 761                 }
 762         }
 763
 764         /**
 765          * @param int $audience One of:
 766          *   Revision::FOR_PUBLIC       to be displayed to all users
 767          *   Revision::FOR_THIS_USER    to be displayed to the given user
 768          *   Revision::RAW              get the text regardless of permissions
 769          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 770          *   to the $audience parameter
 771          * @return string Username of the user that made the last article revision
 772          */
 773         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 774                 $this->loadLastEdit();
 775                 if ( $this->mLastRevision ) {
 776                         return $this->mLastRevision->getUserText( $audience, $user );
 777                 } else {
 778                         return '';
 779                 }
 780         }
 781
 782         /**
 783          * @param int $audience One of:
 784          *   Revision::FOR_PUBLIC       to be displayed to all users
 785          *   Revision::FOR_THIS_USER    to be displayed to the given user
 786          *   Revision::RAW              get the text regardless of permissions
 787          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 788          *   to the $audience parameter
 789          * @return string Comment stored for the last article revision
 790          */
 791         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 792                 $this->loadLastEdit();
 793                 if ( $this->mLastRevision ) {
 794                         return $this->mLastRevision->getComment( $audience, $user );
 795                 } else {
 796                         return '';
 797                 }
 798         }
 799
 800         /**
 801          * Returns true if last revision was marked as "minor edit"
 802          *
 803          * @return bool Minor edit indicator for the last article revision.
 804          */
 805         public function getMinorEdit() {
 806                 $this->loadLastEdit();
 807                 if ( $this->mLastRevision ) {
 808                         return $this->mLastRevision->isMinor();
 809                 } else {
 810                         return false;
 811                 }
 812         }
 813
 814         /**
 815          * Determine whether a page would be suitable for being counted as an
 816          * article in the site_stats table based on the title & its content
 817          *
 818          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 819          *   if false, the current database state will be used
 820          * @return bool
 821          */
 822         public function isCountable( $editInfo = false ) {
 823                 global $wgArticleCountMethod;
 824
 825                 if ( !$this->mTitle->isContentPage() ) {
 826                         return false;
 827                 }
 828
 829                 if ( $editInfo ) {
 830                         $content = $editInfo->pstContent;
 831                 } else {
 832                         $content = $this->getContent();
 833                 }
 834
 835                 if ( !$content || $content->isRedirect() ) {
 836                         return false;
 837                 }
 838
 839                 $hasLinks = null;
 840
 841                 if ( $wgArticleCountMethod === 'link' ) {
 842                         // nasty special case to avoid re-parsing to detect links
 843
 844                         if ( $editInfo ) {
 845                                 // ParserOutput::getLinks() is a 2D array of page links, so
 846                                 // to be really correct we would need to recurse in the array
 847                                 // but the main array should only have items in it if there are
 848                                 // links.
 849                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 850                         } else {
 851                                 $hasLinks = (bool)wfGetDB( DB_REPLICA )->selectField( 'pagelinks', 1,
 852                                         [ 'pl_from' => $this->getId() ], __METHOD__ );
 853                         }
 854                 }
 855
 856                 return $content->isCountable( $hasLinks );
 857         }
 858
 859         /**
 860          * If this page is a redirect, get its target
 861          *
 862          * The target will be fetched from the redirect table if possible.
 863          * If this page doesn't have an entry there, call insertRedirect()
 864          * @return Title|null Title object, or null if this page is not a redirect
 865          */
 866         public function getRedirectTarget() {
 867                 if ( !$this->mTitle->isRedirect() ) {
 868                         return null;
 869                 }
 870
 871                 if ( $this->mRedirectTarget !== null ) {
 872                         return $this->mRedirectTarget;
 873                 }
 874
 875                 // Query the redirect table
 876                 $dbr = wfGetDB( DB_REPLICA );
 877                 $row = $dbr->selectRow( 'redirect',
 878                         [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ],
 879                         [ 'rd_from' => $this->getId() ],
 880                         __METHOD__
 881                 );
 882
 883                 // rd_fragment and rd_interwiki were added later, populate them if empty
 884                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 885                         $this->mRedirectTarget = Title::makeTitle(
 886                                 $row->rd_namespace, $row->rd_title,
 887                                 $row->rd_fragment, $row->rd_interwiki
 888                         );
 889                         return $this->mRedirectTarget;
 890                 }
 891
 892                 // This page doesn't have an entry in the redirect table
 893                 $this->mRedirectTarget = $this->insertRedirect();
 894                 return $this->mRedirectTarget;
 895         }
 896
 897         /**
 898          * Insert an entry for this page into the redirect table if the content is a redirect
 899          *
 900          * The database update will be deferred via DeferredUpdates
 901          *
 902          * Don't call this function directly unless you know what you're doing.
 903          * @return Title|null Title object or null if not a redirect
 904          */
 905         public function insertRedirect() {
 906                 $content = $this->getContent();
 907                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 908                 if ( !$retval ) {
 909                         return null;
 910                 }
 911
 912                 // Update the DB post-send if the page has not cached since now
 913                 $that = $this;
 914                 $latest = $this->getLatest();
 915                 DeferredUpdates::addCallableUpdate(
 916                         function () use ( $that, $retval, $latest ) {
 917                                 $that->insertRedirectEntry( $retval, $latest );
 918                         },
 919                         DeferredUpdates::POSTSEND,
 920                         wfGetDB( DB_MASTER )
 921                 );
 922
 923                 return $retval;
 924         }
 925
 926         /**
 927          * Insert or update the redirect table entry for this page to indicate it redirects to $rt
 928          * @param Title $rt Redirect target
 929          * @param int|null $oldLatest Prior page_latest for check and set
 930          */
 931         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
 932                 $dbw = wfGetDB( DB_MASTER );
 933                 $dbw->startAtomic( __METHOD__ );
 934
 935                 if ( !$oldLatest || $oldLatest == $this->lockAndGetLatest() ) {
 936                         $dbw->replace( 'redirect',
 937                                 [ 'rd_from' ],
 938                                 [
 939                                         'rd_from' => $this->getId(),
 940                                         'rd_namespace' => $rt->getNamespace(),
 941                                         'rd_title' => $rt->getDBkey(),
 942                                         'rd_fragment' => $rt->getFragment(),
 943                                         'rd_interwiki' => $rt->getInterwiki(),
 944                                 ],
 945                                 __METHOD__
 946                         );
 947                 }
 948
 949                 $dbw->endAtomic( __METHOD__ );
 950         }
 951
 952         /**
 953          * Get the Title object or URL this page redirects to
 954          *
 955          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 956          */
 957         public function followRedirect() {
 958                 return $this->getRedirectURL( $this->getRedirectTarget() );
 959         }
 960
 961         /**
 962          * Get the Title object or URL to use for a redirect. We use Title
 963          * objects for same-wiki, non-special redirects and URLs for everything
 964          * else.
 965          * @param Title $rt Redirect target
 966          * @return bool|Title|string False, Title object of local target, or string with URL
 967          */
 968         public function getRedirectURL( $rt ) {
 969                 if ( !$rt ) {
 970                         return false;
 971                 }
 972
 973                 if ( $rt->isExternal() ) {
 974                         if ( $rt->isLocal() ) {
 975                                 // Offsite wikis need an HTTP redirect.
 976                                 // This can be hard to reverse and may produce loops,
 977                                 // so they may be disabled in the site configuration.
 978                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 979                                 return $rt->getFullURL( [ 'rdfrom' => $source ] );
 980                         } else {
 981                                 // External pages without "local" bit set are not valid
 982                                 // redirect targets
 983                                 return false;
 984                         }
 985                 }
 986
 987                 if ( $rt->isSpecialPage() ) {
 988                         // Gotta handle redirects to special pages differently:
 989                         // Fill the HTTP response "Location" header and ignore the rest of the page we're on.
 990                         // Some pages are not valid targets.
 991                         if ( $rt->isValidRedirectTarget() ) {
 992                                 return $rt->getFullURL();
 993                         } else {
 994                                 return false;
 995                         }
 996                 }
 997
 998                 return $rt;
 999         }
1000
1001         /**
1002          * Get a list of users who have edited this article, not including the user who made
1003          * the most recent revision, which you can get from $article->getUser() if you want it
1004          * @return UserArrayFromResult
1005          */
1006         public function getContributors() {
1007                 // @todo FIXME: This is expensive; cache this info somewhere.
1008
1009                 $dbr = wfGetDB( DB_REPLICA );
1010
1011                 if ( $dbr->implicitGroupby() ) {
1012                         $realNameField = 'user_real_name';
1013                 } else {
1014                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1015                 }
1016
1017                 $tables = [ 'revision', 'user' ];
1018
1019                 $fields = [
1020                         'user_id' => 'rev_user',
1021                         'user_name' => 'rev_user_text',
1022                         $realNameField,
1023                         'timestamp' => 'MAX(rev_timestamp)',
1024                 ];
1025
1026                 $conds = [ 'rev_page' => $this->getId() ];
1027
1028                 // The user who made the top revision gets credited as "this page was last edited by
1029                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1030                 $user = $this->getUser();
1031                 if ( $user ) {
1032                         $conds[] = "rev_user != $user";
1033                 } else {
1034                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1035                 }
1036
1037                 // Username hidden?
1038                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0";
1039
1040                 $jconds = [
1041                         'user' => [ 'LEFT JOIN', 'rev_user = user_id' ],
1042                 ];
1043
1044                 $options = [
1045                         'GROUP BY' => [ 'rev_user', 'rev_user_text' ],
1046                         'ORDER BY' => 'timestamp DESC',
1047                 ];
1048
1049                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1050                 return new UserArrayFromResult( $res );
1051         }
1052
1053         /**
1054          * Should the parser cache be used?
1055          *
1056          * @param ParserOptions $parserOptions ParserOptions to check
1057          * @param int $oldId
1058          * @return bool
1059          */
1060         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
1061                 return $parserOptions->getStubThreshold() == 0
1062                         && $this->exists()
1063                         && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
1064                         && $this->getContentHandler()->isParserCacheSupported();
1065         }
1066
1067         /**
1068          * Get a ParserOutput for the given ParserOptions and revision ID.
1069          *
1070          * The parser cache will be used if possible. Cache misses that result
1071          * in parser runs are debounced with PoolCounter.
1072          *
1073          * @since 1.19
1074          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1075          * @param null|int      $oldid Revision ID to get the text from, passing null or 0 will
1076          *                             get the current revision (default value)
1077          * @param bool          $forceParse Force reindexing, regardless of cache settings
1078          * @return bool|ParserOutput ParserOutput or false if the revision was not found
1079          */
1080         public function getParserOutput(
1081                 ParserOptions $parserOptions, $oldid = null, $forceParse = false
1082         ) {
1083                 $useParserCache =
1084                         ( !$forceParse ) && $this->shouldCheckParserCache( $parserOptions, $oldid );
1085                 wfDebug( __METHOD__ .
1086                         ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1087                 if ( $parserOptions->getStubThreshold() ) {
1088                         wfIncrStats( 'pcache.miss.stub' );
1089                 }
1090
1091                 if ( $useParserCache ) {
1092                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1093                         if ( $parserOutput !== false ) {
1094                                 return $parserOutput;
1095                         }
1096                 }
1097
1098                 if ( $oldid === null || $oldid === 0 ) {
1099                         $oldid = $this->getLatest();
1100                 }
1101
1102                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1103                 $pool->execute();
1104
1105                 return $pool->getParserOutput();
1106         }
1107
1108         /**
1109          * Do standard deferred updates after page view (existing or missing page)
1110          * @param User $user The relevant user
1111          * @param int $oldid Revision id being viewed; if not given or 0, latest revision is assumed
1112          */
1113         public function doViewUpdates( User $user, $oldid = 0 ) {
1114                 if ( wfReadOnly() ) {
1115                         return;
1116                 }
1117
1118                 Hooks::run( 'PageViewUpdates', [ $this, $user ] );
1119                 // Update newtalk / watchlist notification status
1120                 try {
1121                         $user->clearNotification( $this->mTitle, $oldid );
1122                 } catch ( DBError $e ) {
1123                         // Avoid outage if the master is not reachable
1124                         MWExceptionHandler::logException( $e );
1125                 }
1126         }
1127
1128         /**
1129          * Perform the actions of a page purging
1130          * @param integer $flags Bitfield of WikiPage::PURGE_* constants
1131          * @return bool
1132          */
1133         public function doPurge( $flags = self::PURGE_ALL ) {
1134                 if ( !Hooks::run( 'ArticlePurge', [ &$this ] ) ) {
1135                         return false;
1136                 }
1137
1138                 if ( ( $flags & self::PURGE_GLOBAL_PCACHE ) == self::PURGE_GLOBAL_PCACHE ) {
1139                         // Set page_touched in the database to invalidate all DC caches
1140                         $this->mTitle->invalidateCache();
1141                 } elseif ( ( $flags & self::PURGE_CLUSTER_PCACHE ) == self::PURGE_CLUSTER_PCACHE ) {
1142                         // Delete the parser options key in the local cluster to invalidate the DC cache
1143                         ParserCache::singleton()->deleteOptionsKey( $this );
1144                         // Avoid sending HTTP 304s in ViewAction to the client who just issued the purge
1145                         $cache = ObjectCache::getLocalClusterInstance();
1146                         $cache->set(
1147                                 $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ),
1148                                 wfTimestamp( TS_MW ),
1149                                 $cache::TTL_HOUR
1150                         );
1151                 }
1152
1153                 if ( ( $flags & self::PURGE_CDN_CACHE ) == self::PURGE_CDN_CACHE ) {
1154                         // Clear any HTML file cache
1155                         HTMLFileCache::clearFileCache( $this->getTitle() );
1156                         // Send purge after any page_touched above update was committed
1157                         DeferredUpdates::addUpdate(
1158                                 new CdnCacheUpdate( $this->mTitle->getCdnUrls() ),
1159                                 DeferredUpdates::PRESEND
1160                         );
1161                 }
1162
1163                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1164                         // @todo move this logic to MessageCache
1165                         if ( $this->exists() ) {
1166                                 // NOTE: use transclusion text for messages.
1167                                 //       This is consistent with  MessageCache::getMsgFromNamespace()
1168
1169                                 $content = $this->getContent();
1170                                 $text = $content === null ? null : $content->getWikitextForTransclusion();
1171
1172                                 if ( $text === null ) {
1173                                         $text = false;
1174                                 }
1175                         } else {
1176                                 $text = false;
1177                         }
1178
1179                         MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
1180                 }
1181
1182                 return true;
1183         }
1184
1185         /**
1186          * Get the last time a user explicitly purged the page via action=purge
1187          *
1188          * @return string|bool TS_MW timestamp or false
1189          * @since 1.28
1190          */
1191         public function getLastPurgeTimestamp() {
1192                 $cache = ObjectCache::getLocalClusterInstance();
1193
1194                 return $cache->get( $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ) );
1195         }
1196
1197         /**
1198          * Insert a new empty page record for this article.
1199          * This *must* be followed up by creating a revision
1200          * and running $this->updateRevisionOn( ... );
1201          * or else the record will be left in a funky state.
1202          * Best if all done inside a transaction.
1203          *
1204          * @param IDatabase $dbw
1205          * @param int|null $pageId Custom page ID that will be used for the insert statement
1206          *
1207          * @return bool|int The newly created page_id key; false if the row was not
1208          *   inserted, e.g. because the title already existed or because the specified
1209          *   page ID is already in use.
1210          */
1211         public function insertOn( $dbw, $pageId = null ) {
1212                 $pageIdForInsert = $pageId ?: $dbw->nextSequenceValue( 'page_page_id_seq' );
1213                 $dbw->insert(
1214                         'page',
1215                         [
1216                                 'page_id'           => $pageIdForInsert,
1217                                 'page_namespace'    => $this->mTitle->getNamespace(),
1218                                 'page_title'        => $this->mTitle->getDBkey(),
1219                                 'page_restrictions' => '',
1220                                 'page_is_redirect'  => 0, // Will set this shortly...
1221                                 'page_is_new'       => 1,
1222                                 'page_random'       => wfRandom(),
1223                                 'page_touched'      => $dbw->timestamp(),
1224                                 'page_latest'       => 0, // Fill this in shortly...
1225                                 'page_len'          => 0, // Fill this in shortly...
1226                         ],
1227                         __METHOD__,
1228                         'IGNORE'
1229                 );
1230
1231                 if ( $dbw->affectedRows() > 0 ) {
1232                         $newid = $pageId ?: $dbw->insertId();
1233                         $this->mId = $newid;
1234                         $this->mTitle->resetArticleID( $newid );
1235
1236                         return $newid;
1237                 } else {
1238                         return false; // nothing changed
1239                 }
1240         }
1241
1242         /**
1243          * Update the page record to point to a newly saved revision.
1244          *
1245          * @param IDatabase $dbw
1246          * @param Revision $revision For ID number, and text used to set
1247          *   length and redirect status fields
1248          * @param int $lastRevision If given, will not overwrite the page field
1249          *   when different from the currently set value.
1250          *   Giving 0 indicates the new page flag should be set on.
1251          * @param bool $lastRevIsRedirect If given, will optimize adding and
1252          *   removing rows in redirect table.
1253          * @return bool Success; false if the page row was missing or page_latest changed
1254          */
1255         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1256                 $lastRevIsRedirect = null
1257         ) {
1258                 global $wgContentHandlerUseDB;
1259
1260                 // Assertion to try to catch T92046
1261                 if ( (int)$revision->getId() === 0 ) {
1262                         throw new InvalidArgumentException(
1263                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1264                         );
1265                 }
1266
1267                 $content = $revision->getContent();
1268                 $len = $content ? $content->getSize() : 0;
1269                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1270
1271                 $conditions = [ 'page_id' => $this->getId() ];
1272
1273                 if ( !is_null( $lastRevision ) ) {
1274                         // An extra check against threads stepping on each other
1275                         $conditions['page_latest'] = $lastRevision;
1276                 }
1277
1278                 $row = [ /* SET */
1279                         'page_latest'      => $revision->getId(),
1280                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1281                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1282                         'page_is_redirect' => $rt !== null ? 1 : 0,
1283                         'page_len'         => $len,
1284                 ];
1285
1286                 if ( $wgContentHandlerUseDB ) {
1287                         $row['page_content_model'] = $revision->getContentModel();
1288                 }
1289
1290                 $dbw->update( 'page',
1291                         $row,
1292                         $conditions,
1293                         __METHOD__ );
1294
1295                 $result = $dbw->affectedRows() > 0;
1296                 if ( $result ) {
1297                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1298                         $this->setLastEdit( $revision );
1299                         $this->mLatest = $revision->getId();
1300                         $this->mIsRedirect = (bool)$rt;
1301                         // Update the LinkCache.
1302                         LinkCache::singleton()->addGoodLinkObj(
1303                                 $this->getId(),
1304                                 $this->mTitle,
1305                                 $len,
1306                                 $this->mIsRedirect,
1307                                 $this->mLatest,
1308                                 $revision->getContentModel()
1309                         );
1310                 }
1311
1312                 return $result;
1313         }
1314
1315         /**
1316          * Add row to the redirect table if this is a redirect, remove otherwise.
1317          *
1318          * @param IDatabase $dbw
1319          * @param Title $redirectTitle Title object pointing to the redirect target,
1320          *   or NULL if this is not a redirect
1321          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1322          *   removing rows in redirect table.
1323          * @return bool True on success, false on failure
1324          * @private
1325          */
1326         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1327                 // Always update redirects (target link might have changed)
1328                 // Update/Insert if we don't know if the last revision was a redirect or not
1329                 // Delete if changing from redirect to non-redirect
1330                 $isRedirect = !is_null( $redirectTitle );
1331
1332                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1333                         return true;
1334                 }
1335
1336                 if ( $isRedirect ) {
1337                         $this->insertRedirectEntry( $redirectTitle );
1338                 } else {
1339                         // This is not a redirect, remove row from redirect table
1340                         $where = [ 'rd_from' => $this->getId() ];
1341                         $dbw->delete( 'redirect', $where, __METHOD__ );
1342                 }
1343
1344                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1345                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1346                 }
1347
1348                 return ( $dbw->affectedRows() != 0 );
1349         }
1350
1351         /**
1352          * If the given revision is newer than the currently set page_latest,
1353          * update the page record. Otherwise, do nothing.
1354          *
1355          * @deprecated since 1.24, use updateRevisionOn instead
1356          *
1357          * @param IDatabase $dbw
1358          * @param Revision $revision
1359          * @return bool
1360          */
1361         public function updateIfNewerOn( $dbw, $revision ) {
1362
1363                 $row = $dbw->selectRow(
1364                         [ 'revision', 'page' ],
1365                         [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
1366                         [
1367                                 'page_id' => $this->getId(),
1368                                 'page_latest=rev_id' ],
1369                         __METHOD__ );
1370
1371                 if ( $row ) {
1372                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1373                                 return false;
1374                         }
1375                         $prev = $row->rev_id;
1376                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1377                 } else {
1378                         // No or missing previous revision; mark the page as new
1379                         $prev = 0;
1380                         $lastRevIsRedirect = null;
1381                 }
1382
1383                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1384
1385                 return $ret;
1386         }
1387
1388         /**
1389          * Get the content that needs to be saved in order to undo all revisions
1390          * between $undo and $undoafter. Revisions must belong to the same page,
1391          * must exist and must not be deleted
1392          * @param Revision $undo
1393          * @param Revision $undoafter Must be an earlier revision than $undo
1394          * @return Content|bool Content on success, false on failure
1395          * @since 1.21
1396          * Before we had the Content object, this was done in getUndoText
1397          */
1398         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1399                 $handler = $undo->getContentHandler();
1400                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1401         }
1402
1403         /**
1404          * Returns true if this page's content model supports sections.
1405          *
1406          * @return bool
1407          *
1408          * @todo The skin should check this and not offer section functionality if
1409          *   sections are not supported.
1410          * @todo The EditPage should check this and not offer section functionality
1411          *   if sections are not supported.
1412          */
1413         public function supportsSections() {
1414                 return $this->getContentHandler()->supportsSections();
1415         }
1416
1417         /**
1418          * @param string|number|null|bool $sectionId Section identifier as a number or string
1419          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1420          * or 'new' for a new section.
1421          * @param Content $sectionContent New content of the section.
1422          * @param string $sectionTitle New section's subject, only if $section is "new".
1423          * @param string $edittime Revision timestamp or null to use the current revision.
1424          *
1425          * @throws MWException
1426          * @return Content|null New complete article content, or null if error.
1427          *
1428          * @since 1.21
1429          * @deprecated since 1.24, use replaceSectionAtRev instead
1430          */
1431         public function replaceSectionContent(
1432                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
1433         ) {
1434
1435                 $baseRevId = null;
1436                 if ( $edittime && $sectionId !== 'new' ) {
1437                         $dbr = wfGetDB( DB_REPLICA );
1438                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1439                         // Try the master if this thread may have just added it.
1440                         // This could be abstracted into a Revision method, but we don't want
1441                         // to encourage loading of revisions by timestamp.
1442                         if ( !$rev
1443                                 && wfGetLB()->getServerCount() > 1
1444                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1445                         ) {
1446                                 $dbw = wfGetDB( DB_MASTER );
1447                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1448                         }
1449                         if ( $rev ) {
1450                                 $baseRevId = $rev->getId();
1451                         }
1452                 }
1453
1454                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1455         }
1456
1457         /**
1458          * @param string|number|null|bool $sectionId Section identifier as a number or string
1459          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1460          * or 'new' for a new section.
1461          * @param Content $sectionContent New content of the section.
1462          * @param string $sectionTitle New section's subject, only if $section is "new".
1463          * @param int|null $baseRevId
1464          *
1465          * @throws MWException
1466          * @return Content|null New complete article content, or null if error.
1467          *
1468          * @since 1.24
1469          */
1470         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1471                 $sectionTitle = '', $baseRevId = null
1472         ) {
1473
1474                 if ( strval( $sectionId ) === '' ) {
1475                         // Whole-page edit; let the whole text through
1476                         $newContent = $sectionContent;
1477                 } else {
1478                         if ( !$this->supportsSections() ) {
1479                                 throw new MWException( "sections not supported for content model " .
1480                                         $this->getContentHandler()->getModelID() );
1481                         }
1482
1483                         // Bug 30711: always use current version when adding a new section
1484                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1485                                 $oldContent = $this->getContent();
1486                         } else {
1487                                 $rev = Revision::newFromId( $baseRevId );
1488                                 if ( !$rev ) {
1489                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1490                                                 $this->getId() . "; section: $sectionId)\n" );
1491                                         return null;
1492                                 }
1493
1494                                 $oldContent = $rev->getContent();
1495                         }
1496
1497                         if ( !$oldContent ) {
1498                                 wfDebug( __METHOD__ . ": no page text\n" );
1499                                 return null;
1500                         }
1501
1502                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1503                 }
1504
1505                 return $newContent;
1506         }
1507
1508         /**
1509          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1510          * @param int $flags
1511          * @return int Updated $flags
1512          */
1513         public function checkFlags( $flags ) {
1514                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1515                         if ( $this->exists() ) {
1516                                 $flags |= EDIT_UPDATE;
1517                         } else {
1518                                 $flags |= EDIT_NEW;
1519                         }
1520                 }
1521
1522                 return $flags;
1523         }
1524
1525         /**
1526          * Change an existing article or create a new article. Updates RC and all necessary caches,
1527          * optionally via the deferred update array.
1528          *
1529          * @param string $text New text
1530          * @param string $summary Edit summary
1531          * @param int $flags Bitfield:
1532          *      EDIT_NEW
1533          *          Article is known or assumed to be non-existent, create a new one
1534          *      EDIT_UPDATE
1535          *          Article is known or assumed to be pre-existing, update it
1536          *      EDIT_MINOR
1537          *          Mark this edit minor, if the user is allowed to do so
1538          *      EDIT_SUPPRESS_RC
1539          *          Do not log the change in recentchanges
1540          *      EDIT_FORCE_BOT
1541          *          Mark the edit a "bot" edit regardless of user rights
1542          *      EDIT_AUTOSUMMARY
1543          *          Fill in blank summaries with generated text where possible
1544          *      EDIT_INTERNAL
1545          *          Signal that the page retrieve/save cycle happened entirely in this request.
1546          *
1547          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1548          * article will be detected. If EDIT_UPDATE is specified and the article
1549          * doesn't exist, the function will return an edit-gone-missing error. If
1550          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1551          * error will be returned. These two conditions are also possible with
1552          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1553          *
1554          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1555          *   This is not the parent revision ID, rather the revision ID for older
1556          *   content used as the source for a rollback, for example.
1557          * @param User $user The user doing the edit
1558          *
1559          * @throws MWException
1560          * @return Status Possible errors:
1561          *   edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1562          *     set the fatal flag of $status
1563          *   edit-gone-missing: In update mode, but the article didn't exist.
1564          *   edit-conflict: In update mode, the article changed unexpectedly.
1565          *   edit-no-change: Warning that the text was the same as before.
1566          *   edit-already-exists: In creation mode, but the article already exists.
1567          *
1568          * Extensions may define additional errors.
1569          *
1570          * $return->value will contain an associative array with members as follows:
1571          *     new: Boolean indicating if the function attempted to create a new article.
1572          *     revision: The revision object for the inserted revision, or null.
1573          *
1574          * Compatibility note: this function previously returned a boolean value
1575          * indicating success/failure
1576          *
1577          * @deprecated since 1.21: use doEditContent() instead.
1578          */
1579         public function doEdit( $text, $summary, $flags = 0, $baseRevId = false, $user = null ) {
1580                 wfDeprecated( __METHOD__, '1.21' );
1581
1582                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
1583
1584                 return $this->doEditContent( $content, $summary, $flags, $baseRevId, $user );
1585         }
1586
1587         /**
1588          * Change an existing article or create a new article. Updates RC and all necessary caches,
1589          * optionally via the deferred update array.
1590          *
1591          * @param Content $content New content
1592          * @param string $summary Edit summary
1593          * @param int $flags Bitfield:
1594          *      EDIT_NEW
1595          *          Article is known or assumed to be non-existent, create a new one
1596          *      EDIT_UPDATE
1597          *          Article is known or assumed to be pre-existing, update it
1598          *      EDIT_MINOR
1599          *          Mark this edit minor, if the user is allowed to do so
1600          *      EDIT_SUPPRESS_RC
1601          *          Do not log the change in recentchanges
1602          *      EDIT_FORCE_BOT
1603          *          Mark the edit a "bot" edit regardless of user rights
1604          *      EDIT_AUTOSUMMARY
1605          *          Fill in blank summaries with generated text where possible
1606          *      EDIT_INTERNAL
1607          *          Signal that the page retrieve/save cycle happened entirely in this request.
1608          *
1609          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1610          * article will be detected. If EDIT_UPDATE is specified and the article
1611          * doesn't exist, the function will return an edit-gone-missing error. If
1612          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1613          * error will be returned. These two conditions are also possible with
1614          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1615          *
1616          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1617          *   This is not the parent revision ID, rather the revision ID for older
1618          *   content used as the source for a rollback, for example.
1619          * @param User $user The user doing the edit
1620          * @param string $serialFormat Format for storing the content in the
1621          *   database.
1622          * @param array|null $tags Change tags to apply to this edit
1623          * Callers are responsible for permission checks
1624          * (with ChangeTags::canAddTagsAccompanyingChange)
1625          *
1626          * @throws MWException
1627          * @return Status Possible errors:
1628          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1629          *       set the fatal flag of $status.
1630          *     edit-gone-missing: In update mode, but the article didn't exist.
1631          *     edit-conflict: In update mode, the article changed unexpectedly.
1632          *     edit-no-change: Warning that the text was the same as before.
1633          *     edit-already-exists: In creation mode, but the article already exists.
1634          *
1635          *  Extensions may define additional errors.
1636          *
1637          *  $return->value will contain an associative array with members as follows:
1638          *     new: Boolean indicating if the function attempted to create a new article.
1639          *     revision: The revision object for the inserted revision, or null.
1640          *
1641          * @since 1.21
1642          * @throws MWException
1643          */
1644         public function doEditContent(
1645                 Content $content, $summary, $flags = 0, $baseRevId = false,
1646                 User $user = null, $serialFormat = null, $tags = []
1647         ) {
1648                 global $wgUser, $wgUseAutomaticEditSummaries;
1649
1650                 // Old default parameter for $tags was null
1651                 if ( $tags === null ) {
1652                         $tags = [];
1653                 }
1654
1655                 // Low-level sanity check
1656                 if ( $this->mTitle->getText() === '' ) {
1657                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1658                 }
1659                 // Make sure the given content type is allowed for this page
1660                 if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
1661                         return Status::newFatal( 'content-not-allowed-here',
1662                                 ContentHandler::getLocalizedName( $content->getModel() ),
1663                                 $this->mTitle->getPrefixedText()
1664                         );
1665                 }
1666
1667                 // Load the data from the master database if needed.
1668                 // The caller may already loaded it from the master or even loaded it using
1669                 // SELECT FOR UPDATE, so do not override that using clear().
1670                 $this->loadPageData( 'fromdbmaster' );
1671
1672                 $user = $user ?: $wgUser;
1673                 $flags = $this->checkFlags( $flags );
1674
1675                 // Trigger pre-save hook (using provided edit summary)
1676                 $hookStatus = Status::newGood( [] );
1677                 $hook_args = [ &$this, &$user, &$content, &$summary,
1678                                                         $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
1679                 // Check if the hook rejected the attempted save
1680                 if ( !Hooks::run( 'PageContentSave', $hook_args )
1681                         || !ContentHandler::runLegacyHooks( 'ArticleSave', $hook_args )
1682                 ) {
1683                         if ( $hookStatus->isOK() ) {
1684                                 // Hook returned false but didn't call fatal(); use generic message
1685                                 $hookStatus->fatal( 'edit-hook-aborted' );
1686                         }
1687
1688                         return $hookStatus;
1689                 }
1690
1691                 $old_revision = $this->getRevision(); // current revision
1692                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1693
1694                 if ( $old_content && $old_content->getModel() !== $content->getModel() ) {
1695                         $tags[] = 'mw-contentmodelchange';
1696                 }
1697
1698                 // Provide autosummaries if one is not provided and autosummaries are enabled
1699                 if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
1700                         $handler = $content->getContentHandler();
1701                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1702                 }
1703
1704                 // Avoid statsd noise and wasted cycles check the edit stash (T136678)
1705                 if ( ( $flags & EDIT_INTERNAL ) || ( $flags & EDIT_FORCE_BOT ) ) {
1706                         $useCache = false;
1707                 } else {
1708                         $useCache = true;
1709                 }
1710
1711                 // Get the pre-save transform content and final parser output
1712                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat, $useCache );
1713                 $pstContent = $editInfo->pstContent; // Content object
1714                 $meta = [
1715                         'bot' => ( $flags & EDIT_FORCE_BOT ),
1716                         'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
1717                         'serialized' => $editInfo->pst,
1718                         'serialFormat' => $serialFormat,
1719                         'baseRevId' => $baseRevId,
1720                         'oldRevision' => $old_revision,
1721                         'oldContent' => $old_content,
1722                         'oldId' => $this->getLatest(),
1723                         'oldIsRedirect' => $this->isRedirect(),
1724                         'oldCountable' => $this->isCountable(),
1725                         'tags' => ( $tags !== null ) ? (array)$tags : []
1726                 ];
1727
1728                 // Actually create the revision and create/update the page
1729                 if ( $flags & EDIT_UPDATE ) {
1730                         $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
1731                 } else {
1732                         $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
1733                 }
1734
1735                 // Promote user to any groups they meet the criteria for
1736                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1737                         $user->addAutopromoteOnceGroups( 'onEdit' );
1738                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1739                 } );
1740
1741                 return $status;
1742         }
1743
1744         /**
1745          * @param Content $content Pre-save transform content
1746          * @param integer $flags
1747          * @param User $user
1748          * @param string $summary
1749          * @param array $meta
1750          * @return Status
1751          * @throws DBUnexpectedError
1752          * @throws Exception
1753          * @throws FatalError
1754          * @throws MWException
1755          */
1756         private function doModify(
1757                 Content $content, $flags, User $user, $summary, array $meta
1758         ) {
1759                 global $wgUseRCPatrol;
1760
1761                 // Update article, but only if changed.
1762                 $status = Status::newGood( [ 'new' => false, 'revision' => null ] );
1763
1764                 // Convenience variables
1765                 $now = wfTimestampNow();
1766                 $oldid = $meta['oldId'];
1767                 /** @var $oldContent Content|null */
1768                 $oldContent = $meta['oldContent'];
1769                 $newsize = $content->getSize();
1770
1771                 if ( !$oldid ) {
1772                         // Article gone missing
1773                         $status->fatal( 'edit-gone-missing' );
1774
1775                         return $status;
1776                 } elseif ( !$oldContent ) {
1777                         // Sanity check for bug 37225
1778                         throw new MWException( "Could not find text for current revision {$oldid}." );
1779                 }
1780
1781                 // @TODO: pass content object?!
1782                 $revision = new Revision( [
1783                         'page'       => $this->getId(),
1784                         'title'      => $this->mTitle, // for determining the default content model
1785                         'comment'    => $summary,
1786                         'minor_edit' => $meta['minor'],
1787                         'text'       => $meta['serialized'],
1788                         'len'        => $newsize,
1789                         'parent_id'  => $oldid,
1790                         'user'       => $user->getId(),
1791                         'user_text'  => $user->getName(),
1792                         'timestamp'  => $now,
1793                         'content_model' => $content->getModel(),
1794                         'content_format' => $meta['serialFormat'],
1795                 ] );
1796
1797                 $changed = !$content->equals( $oldContent );
1798
1799                 $dbw = wfGetDB( DB_MASTER );
1800
1801                 if ( $changed ) {
1802                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1803                         $status->merge( $prepStatus );
1804                         if ( !$status->isOK() ) {
1805                                 return $status;
1806                         }
1807
1808                         $dbw->startAtomic( __METHOD__ );
1809                         // Get the latest page_latest value while locking it.
1810                         // Do a CAS style check to see if it's the same as when this method
1811                         // started. If it changed then bail out before touching the DB.
1812                         $latestNow = $this->lockAndGetLatest();
1813                         if ( $latestNow != $oldid ) {
1814                                 $dbw->endAtomic( __METHOD__ );
1815                                 // Page updated or deleted in the mean time
1816                                 $status->fatal( 'edit-conflict' );
1817
1818                                 return $status;
1819                         }
1820
1821                         // At this point we are now comitted to returning an OK
1822                         // status unless some DB query error or other exception comes up.
1823                         // This way callers don't have to call rollback() if $status is bad
1824                         // unless they actually try to catch exceptions (which is rare).
1825
1826                         // Save the revision text
1827                         $revisionId = $revision->insertOn( $dbw );
1828                         // Update page_latest and friends to reflect the new revision
1829                         if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
1830                                 throw new MWException( "Failed to update page row to use new revision." );
1831                         }
1832
1833                         Hooks::run( 'NewRevisionFromEditComplete',
1834                                 [ $this, $revision, $meta['baseRevId'], $user ] );
1835
1836                         // Update recentchanges
1837                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1838                                 // Mark as patrolled if the user can do so
1839                                 $patrolled = $wgUseRCPatrol && !count(
1840                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1841                                 // Add RC row to the DB
1842                                 RecentChange::notifyEdit(
1843                                         $now,
1844                                         $this->mTitle,
1845                                         $revision->isMinor(),
1846                                         $user,
1847                                         $summary,
1848                                         $oldid,
1849                                         $this->getTimestamp(),
1850                                         $meta['bot'],
1851                                         '',
1852                                         $oldContent ? $oldContent->getSize() : 0,
1853                                         $newsize,
1854                                         $revisionId,
1855                                         $patrolled,
1856                                         $meta['tags']
1857                                 );
1858                         }
1859
1860                         $user->incEditCount();
1861
1862                         $dbw->endAtomic( __METHOD__ );
1863                         $this->mTimestamp = $now;
1864                 } else {
1865                         // Bug 32948: revision ID must be set to page {{REVISIONID}} and
1866                         // related variables correctly. Likewise for {{REVISIONUSER}} (T135261).
1867                         $revision->setId( $this->getLatest() );
1868                         $revision->setUserIdAndName(
1869                                 $this->getUser( Revision::RAW ),
1870                                 $this->getUserText( Revision::RAW )
1871                         );
1872                 }
1873
1874                 if ( $changed ) {
1875                         // Return the new revision to the caller
1876                         $status->value['revision'] = $revision;
1877                 } else {
1878                         $status->warning( 'edit-no-change' );
1879                         // Update page_touched as updateRevisionOn() was not called.
1880                         // Other cache updates are managed in onArticleEdit() via doEditUpdates().
1881                         $this->mTitle->invalidateCache( $now );
1882                 }
1883
1884                 // Do secondary updates once the main changes have been committed...
1885                 DeferredUpdates::addUpdate(
1886                         new AtomicSectionUpdate(
1887                                 $dbw,
1888                                 __METHOD__,
1889                                 function () use (
1890                                         $revision, &$user, $content, $summary, &$flags,
1891                                         $changed, $meta, &$status
1892                                 ) {
1893                                         // Update links tables, site stats, etc.
1894                                         $this->doEditUpdates(
1895                                                 $revision,
1896                                                 $user,
1897                                                 [
1898                                                         'changed' => $changed,
1899                                                         'oldcountable' => $meta['oldCountable'],
1900                                                         'oldrevision' => $meta['oldRevision']
1901                                                 ]
1902                                         );
1903                                         // Trigger post-save hook
1904                                         $params = [ &$this, &$user, $content, $summary, $flags & EDIT_MINOR,
1905                                                 null, null, &$flags, $revision, &$status, $meta['baseRevId'] ];
1906                                         ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params );
1907                                         Hooks::run( 'PageContentSaveComplete', $params );
1908                                 }
1909                         ),
1910                         DeferredUpdates::PRESEND
1911                 );
1912
1913                 return $status;
1914         }
1915
1916         /**
1917          * @param Content $content Pre-save transform content
1918          * @param integer $flags
1919          * @param User $user
1920          * @param string $summary
1921          * @param array $meta
1922          * @return Status
1923          * @throws DBUnexpectedError
1924          * @throws Exception
1925          * @throws FatalError
1926          * @throws MWException
1927          */
1928         private function doCreate(
1929                 Content $content, $flags, User $user, $summary, array $meta
1930         ) {
1931                 global $wgUseRCPatrol, $wgUseNPPatrol;
1932
1933                 $status = Status::newGood( [ 'new' => true, 'revision' => null ] );
1934
1935                 $now = wfTimestampNow();
1936                 $newsize = $content->getSize();
1937                 $prepStatus = $content->prepareSave( $this, $flags, $meta['oldId'], $user );
1938                 $status->merge( $prepStatus );
1939                 if ( !$status->isOK() ) {
1940                         return $status;
1941                 }
1942
1943                 $dbw = wfGetDB( DB_MASTER );
1944                 $dbw->startAtomic( __METHOD__ );
1945
1946                 // Add the page record unless one already exists for the title
1947                 $newid = $this->insertOn( $dbw );
1948                 if ( $newid === false ) {
1949                         $dbw->endAtomic( __METHOD__ ); // nothing inserted
1950                         $status->fatal( 'edit-already-exists' );
1951
1952                         return $status; // nothing done
1953                 }
1954
1955                 // At this point we are now comitted to returning an OK
1956                 // status unless some DB query error or other exception comes up.
1957                 // This way callers don't have to call rollback() if $status is bad
1958                 // unless they actually try to catch exceptions (which is rare).
1959
1960                 // @TODO: pass content object?!
1961                 $revision = new Revision( [
1962                         'page'       => $newid,
1963                         'title'      => $this->mTitle, // for determining the default content model
1964                         'comment'    => $summary,
1965                         'minor_edit' => $meta['minor'],
1966                         'text'       => $meta['serialized'],
1967                         'len'        => $newsize,
1968                         'user'       => $user->getId(),
1969                         'user_text'  => $user->getName(),
1970                         'timestamp'  => $now,
1971                         'content_model' => $content->getModel(),
1972                         'content_format' => $meta['serialFormat'],
1973                 ] );
1974
1975                 // Save the revision text...
1976                 $revisionId = $revision->insertOn( $dbw );
1977                 // Update the page record with revision data
1978                 if ( !$this->updateRevisionOn( $dbw, $revision, 0 ) ) {
1979                         throw new MWException( "Failed to update page row to use new revision." );
1980                 }
1981
1982                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
1983
1984                 // Update recentchanges
1985                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1986                         // Mark as patrolled if the user can do so
1987                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) &&
1988                                 !count( $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1989                         // Add RC row to the DB
1990                         RecentChange::notifyNew(
1991                                 $now,
1992                                 $this->mTitle,
1993                                 $revision->isMinor(),
1994                                 $user,
1995                                 $summary,
1996                                 $meta['bot'],
1997                                 '',
1998                                 $newsize,
1999                                 $revisionId,
2000                                 $patrolled,
2001                                 $meta['tags']
2002                         );
2003                 }
2004
2005                 $user->incEditCount();
2006
2007                 $dbw->endAtomic( __METHOD__ );
2008                 $this->mTimestamp = $now;
2009
2010                 // Return the new revision to the caller
2011                 $status->value['revision'] = $revision;
2012
2013                 // Do secondary updates once the main changes have been committed...
2014                 DeferredUpdates::addUpdate(
2015                         new AtomicSectionUpdate(
2016                                 $dbw,
2017                                 __METHOD__,
2018                                 function () use (
2019                                         $revision, &$user, $content, $summary, &$flags, $meta, &$status
2020                                 ) {
2021                                         // Update links, etc.
2022                                         $this->doEditUpdates( $revision, $user, [ 'created' => true ] );
2023                                         // Trigger post-create hook
2024                                         $params = [ &$this, &$user, $content, $summary,
2025                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ];
2026                                         ContentHandler::runLegacyHooks( 'ArticleInsertComplete', $params );
2027                                         Hooks::run( 'PageContentInsertComplete', $params );
2028                                         // Trigger post-save hook
2029                                         $params = array_merge( $params, [ &$status, $meta['baseRevId'] ] );
2030                                         ContentHandler::runLegacyHooks( 'ArticleSaveComplete', $params );
2031                                         Hooks::run( 'PageContentSaveComplete', $params );
2032
2033                                 }
2034                         ),
2035                         DeferredUpdates::PRESEND
2036                 );
2037
2038                 return $status;
2039         }
2040
2041         /**
2042          * Get parser options suitable for rendering the primary article wikitext
2043          *
2044          * @see ContentHandler::makeParserOptions
2045          *
2046          * @param IContextSource|User|string $context One of the following:
2047          *        - IContextSource: Use the User and the Language of the provided
2048          *          context
2049          *        - User: Use the provided User object and $wgLang for the language,
2050          *          so use an IContextSource object if possible.
2051          *        - 'canonical': Canonical options (anonymous user with default
2052          *          preferences and content language).
2053          * @return ParserOptions
2054          */
2055         public function makeParserOptions( $context ) {
2056                 $options = $this->getContentHandler()->makeParserOptions( $context );
2057
2058                 if ( $this->getTitle()->isConversionTable() ) {
2059                         // @todo ConversionTable should become a separate content model, so
2060                         // we don't need special cases like this one.
2061                         $options->disableContentConversion();
2062                 }
2063
2064                 return $options;
2065         }
2066
2067         /**
2068          * Prepare text which is about to be saved.
2069          * Returns a stdClass with source, pst and output members
2070          *
2071          * @param string $text
2072          * @param int|null $revid
2073          * @param User|null $user
2074          * @deprecated since 1.21: use prepareContentForEdit instead.
2075          * @return object
2076          */
2077         public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
2078                 ContentHandler::deprecated( __METHOD__, '1.21' );
2079                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
2080                 return $this->prepareContentForEdit( $content, $revid, $user );
2081         }
2082
2083         /**
2084          * Prepare content which is about to be saved.
2085          * Returns a stdClass with source, pst and output members
2086          *
2087          * @param Content $content
2088          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
2089          *        revision ID is also accepted, but this is deprecated.
2090          * @param User|null $user
2091          * @param string|null $serialFormat
2092          * @param bool $useCache Check shared prepared edit cache
2093          *
2094          * @return object
2095          *
2096          * @since 1.21
2097          */
2098         public function prepareContentForEdit(
2099                 Content $content, $revision = null, User $user = null,
2100                 $serialFormat = null, $useCache = true
2101         ) {
2102                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2103
2104                 if ( is_object( $revision ) ) {
2105                         $revid = $revision->getId();
2106                 } else {
2107                         $revid = $revision;
2108                         // This code path is deprecated, and nothing is known to
2109                         // use it, so performance here shouldn't be a worry.
2110                         if ( $revid !== null ) {
2111                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2112                         } else {
2113                                 $revision = null;
2114                         }
2115                 }
2116
2117                 $user = is_null( $user ) ? $wgUser : $user;
2118                 // XXX: check $user->getId() here???
2119
2120                 // Use a sane default for $serialFormat, see bug 57026
2121                 if ( $serialFormat === null ) {
2122                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2123                 }
2124
2125                 if ( $this->mPreparedEdit
2126                         && isset( $this->mPreparedEdit->newContent )
2127                         && $this->mPreparedEdit->newContent->equals( $content )
2128                         && $this->mPreparedEdit->revid == $revid
2129                         && $this->mPreparedEdit->format == $serialFormat
2130                         // XXX: also check $user here?
2131                 ) {
2132                         // Already prepared
2133                         return $this->mPreparedEdit;
2134                 }
2135
2136                 // The edit may have already been prepared via api.php?action=stashedit
2137                 $cachedEdit = $useCache && $wgAjaxEditStash
2138                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2139                         : false;
2140
2141                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2142                 Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );
2143
2144                 $edit = (object)[];
2145                 if ( $cachedEdit ) {
2146                         $edit->timestamp = $cachedEdit->timestamp;
2147                 } else {
2148                         $edit->timestamp = wfTimestampNow();
2149                 }
2150                 // @note: $cachedEdit is safely not used if the rev ID was referenced in the text
2151                 $edit->revid = $revid;
2152
2153                 if ( $cachedEdit ) {
2154                         $edit->pstContent = $cachedEdit->pstContent;
2155                 } else {
2156                         $edit->pstContent = $content
2157                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2158                                 : null;
2159                 }
2160
2161                 $edit->format = $serialFormat;
2162                 $edit->popts = $this->makeParserOptions( 'canonical' );
2163                 if ( $cachedEdit ) {
2164                         $edit->output = $cachedEdit->output;
2165                 } else {
2166                         if ( $revision ) {
2167                                 // We get here if vary-revision is set. This means that this page references
2168                                 // itself (such as via self-transclusion). In this case, we need to make sure
2169                                 // that any such self-references refer to the newly-saved revision, and not
2170                                 // to the previous one, which could otherwise happen due to replica DB lag.
2171                                 $oldCallback = $edit->popts->getCurrentRevisionCallback();
2172                                 $edit->popts->setCurrentRevisionCallback(
2173                                         function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
2174                                                 if ( $title->equals( $revision->getTitle() ) ) {
2175                                                         return $revision;
2176                                                 } else {
2177                                                         return call_user_func( $oldCallback, $title, $parser );
2178                                                 }
2179                                         }
2180                                 );
2181                         } else {
2182                                 // Try to avoid a second parse if {{REVISIONID}} is used
2183                                 $edit->popts->setSpeculativeRevIdCallback( function () {
2184                                         return 1 + (int)wfGetDB( DB_MASTER )->selectField(
2185                                                 'revision',
2186                                                 'MAX(rev_id)',
2187                                                 [],
2188                                                 __METHOD__
2189                                         );
2190                                 } );
2191                         }
2192                         $edit->output = $edit->pstContent
2193                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2194                                 : null;
2195                 }
2196
2197                 $edit->newContent = $content;
2198                 $edit->oldContent = $this->getContent( Revision::RAW );
2199
2200                 // NOTE: B/C for hooks! don't use these fields!
2201                 $edit->newText = $edit->newContent
2202                         ? ContentHandler::getContentText( $edit->newContent )
2203                         : '';
2204                 $edit->oldText = $edit->oldContent
2205                         ? ContentHandler::getContentText( $edit->oldContent )
2206                         : '';
2207                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2208
2209                 if ( $edit->output ) {
2210                         $edit->output->setCacheTime( wfTimestampNow() );
2211                 }
2212
2213                 // Process cache the result
2214                 $this->mPreparedEdit = $edit;
2215
2216                 return $edit;
2217         }
2218
2219         /**
2220          * Do standard deferred updates after page edit.
2221          * Update links tables, site stats, search index and message cache.
2222          * Purges pages that include this page if the text was changed here.
2223          * Every 100th edit, prune the recent changes table.
2224          *
2225          * @param Revision $revision
2226          * @param User $user User object that did the revision
2227          * @param array $options Array of options, following indexes are used:
2228          * - changed: boolean, whether the revision changed the content (default true)
2229          * - created: boolean, whether the revision created the page (default false)
2230          * - moved: boolean, whether the page was moved (default false)
2231          * - restored: boolean, whether the page was undeleted (default false)
2232          * - oldrevision: Revision object for the pre-update revision (default null)
2233          * - oldcountable: boolean, null, or string 'no-change' (default null):
2234          *   - boolean: whether the page was counted as an article before that
2235          *     revision, only used in changed is true and created is false
2236          *   - null: if created is false, don't update the article count; if created
2237          *     is true, do update the article count
2238          *   - 'no-change': don't update the article count, ever
2239          */
2240         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2241                 global $wgRCWatchCategoryMembership, $wgContLang;
2242
2243                 $options += [
2244                         'changed' => true,
2245                         'created' => false,
2246                         'moved' => false,
2247                         'restored' => false,
2248                         'oldrevision' => null,
2249                         'oldcountable' => null
2250                 ];
2251                 $content = $revision->getContent();
2252
2253                 $logger = LoggerFactory::getInstance( 'SaveParse' );
2254
2255                 // See if the parser output before $revision was inserted is still valid
2256                 $editInfo = false;
2257                 if ( !$this->mPreparedEdit ) {
2258                         $logger->debug( __METHOD__ . ": No prepared edit...\n" );
2259                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2260                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision...\n" );
2261                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision-id' )
2262                         && $this->mPreparedEdit->output->getSpeculativeRevIdUsed() !== $revision->getId()
2263                 ) {
2264                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision-id with wrong ID...\n" );
2265                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-user' ) && !$options['changed'] ) {
2266                         $logger->info( __METHOD__ . ": Prepared edit has vary-user and is null...\n" );
2267                 } else {
2268                         wfDebug( __METHOD__ . ": Using prepared edit...\n" );
2269                         $editInfo = $this->mPreparedEdit;
2270                 }
2271
2272                 if ( !$editInfo ) {
2273                         // Parse the text again if needed. Be careful not to do pre-save transform twice:
2274                         // $text is usually already pre-save transformed once. Avoid using the edit stash
2275                         // as any prepared content from there or in doEditContent() was already rejected.
2276                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user, null, false );
2277                 }
2278
2279                 // Save it to the parser cache.
2280                 // Make sure the cache time matches page_touched to avoid double parsing.
2281                 ParserCache::singleton()->save(
2282                         $editInfo->output, $this, $editInfo->popts,
2283                         $revision->getTimestamp(), $editInfo->revid
2284                 );
2285
2286                 // Update the links tables and other secondary data
2287                 if ( $content ) {
2288                         $recursive = $options['changed']; // bug 50785
2289                         $updates = $content->getSecondaryDataUpdates(
2290                                 $this->getTitle(), null, $recursive, $editInfo->output
2291                         );
2292                         foreach ( $updates as $update ) {
2293                                 if ( $update instanceof LinksUpdate ) {
2294                                         $update->setRevision( $revision );
2295                                         $update->setTriggeringUser( $user );
2296                                 }
2297                                 DeferredUpdates::addUpdate( $update );
2298                         }
2299                         if ( $wgRCWatchCategoryMembership
2300                                 && $this->getContentHandler()->supportsCategories() === true
2301                                 && ( $options['changed'] || $options['created'] )
2302                                 && !$options['restored']
2303                         ) {
2304                                 // Note: jobs are pushed after deferred updates, so the job should be able to see
2305                                 // the recent change entry (also done via deferred updates) and carry over any
2306                                 // bot/deletion/IP flags, ect.
2307                                 JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
2308                                         $this->getTitle(),
2309                                         [
2310                                                 'pageId' => $this->getId(),
2311                                                 'revTimestamp' => $revision->getTimestamp()
2312                                         ]
2313                                 ) );
2314                         }
2315                 }
2316
2317                 Hooks::run( 'ArticleEditUpdates', [ &$this, &$editInfo, $options['changed'] ] );
2318
2319                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$this ] ) ) {
2320                         // Flush old entries from the `recentchanges` table
2321                         if ( mt_rand( 0, 9 ) == 0 ) {
2322                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2323                         }
2324                 }
2325
2326                 if ( !$this->exists() ) {
2327                         return;
2328                 }
2329
2330                 $id = $this->getId();
2331                 $title = $this->mTitle->getPrefixedDBkey();
2332                 $shortTitle = $this->mTitle->getDBkey();
2333
2334                 if ( $options['oldcountable'] === 'no-change' ||
2335                         ( !$options['changed'] && !$options['moved'] )
2336                 ) {
2337                         $good = 0;
2338                 } elseif ( $options['created'] ) {
2339                         $good = (int)$this->isCountable( $editInfo );
2340                 } elseif ( $options['oldcountable'] !== null ) {
2341                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2342                 } else {
2343                         $good = 0;
2344                 }
2345                 $edits = $options['changed'] ? 1 : 0;
2346                 $total = $options['created'] ? 1 : 0;
2347
2348                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2349                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2350
2351                 // If this is another user's talk page, update newtalk.
2352                 // Don't do this if $options['changed'] = false (null-edits) nor if
2353                 // it's a minor edit and the user doesn't want notifications for those.
2354                 if ( $options['changed']
2355                         && $this->mTitle->getNamespace() == NS_USER_TALK
2356                         && $shortTitle != $user->getTitleKey()
2357                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2358                 ) {
2359                         $recipient = User::newFromName( $shortTitle, false );
2360                         if ( !$recipient ) {
2361                                 wfDebug( __METHOD__ . ": invalid username\n" );
2362                         } else {
2363                                 // Allow extensions to prevent user notification
2364                                 // when a new message is added to their talk page
2365                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$this, $recipient ] ) ) {
2366                                         if ( User::isIP( $shortTitle ) ) {
2367                                                 // An anonymous user
2368                                                 $recipient->setNewtalk( true, $revision );
2369                                         } elseif ( $recipient->isLoggedIn() ) {
2370                                                 $recipient->setNewtalk( true, $revision );
2371                                         } else {
2372                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2373                                         }
2374                                 }
2375                         }
2376                 }
2377
2378                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2379                         // XXX: could skip pseudo-messages like js/css here, based on content model.
2380                         $msgtext = $content ? $content->getWikitextForTransclusion() : null;
2381                         if ( $msgtext === false || $msgtext === null ) {
2382                                 $msgtext = '';
2383                         }
2384
2385                         MessageCache::singleton()->replace( $shortTitle, $msgtext );
2386
2387                         if ( $wgContLang->hasVariants() ) {
2388                                 $wgContLang->updateConversionTable( $this->mTitle );
2389                         }
2390                 }
2391
2392                 if ( $options['created'] ) {
2393                         self::onArticleCreate( $this->mTitle );
2394                 } elseif ( $options['changed'] ) { // bug 50785
2395                         self::onArticleEdit( $this->mTitle, $revision );
2396                 }
2397         }
2398
2399         /**
2400          * Edit an article without doing all that other stuff
2401          * The article must already exist; link tables etc
2402          * are not updated, caches are not flushed.
2403          *
2404          * @param Content $content Content submitted
2405          * @param User $user The relevant user
2406          * @param string $comment Comment submitted
2407          * @param bool $minor Whereas it's a minor modification
2408          * @param string $serialFormat Format for storing the content in the database
2409          */
2410         public function doQuickEditContent(
2411                 Content $content, User $user, $comment = '', $minor = false, $serialFormat = null
2412         ) {
2413
2414                 $serialized = $content->serialize( $serialFormat );
2415
2416                 $dbw = wfGetDB( DB_MASTER );
2417                 $revision = new Revision( [
2418                         'title'      => $this->getTitle(), // for determining the default content model
2419                         'page'       => $this->getId(),
2420                         'user_text'  => $user->getName(),
2421                         'user'       => $user->getId(),
2422                         'text'       => $serialized,
2423                         'length'     => $content->getSize(),
2424                         'comment'    => $comment,
2425                         'minor_edit' => $minor ? 1 : 0,
2426                 ] ); // XXX: set the content object?
2427                 $revision->insertOn( $dbw );
2428                 $this->updateRevisionOn( $dbw, $revision );
2429
2430                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
2431
2432         }
2433
2434         /**
2435          * Update the article's restriction field, and leave a log entry.
2436          * This works for protection both existing and non-existing pages.
2437          *
2438          * @param array $limit Set of restriction keys
2439          * @param array $expiry Per restriction type expiration
2440          * @param int &$cascade Set to false if cascading protection isn't allowed.
2441          * @param string $reason
2442          * @param User $user The user updating the restrictions
2443          * @param string|string[] $tags Change tags to add to the pages and protection log entries
2444          *   ($user should be able to add the specified tags before this is called)
2445          * @return Status Status object; if action is taken, $status->value is the log_id of the
2446          *   protection log entry.
2447          */
2448         public function doUpdateRestrictions( array $limit, array $expiry,
2449                 &$cascade, $reason, User $user, $tags = null
2450         ) {
2451                 global $wgCascadingRestrictionLevels, $wgContLang;
2452
2453                 if ( wfReadOnly() ) {
2454                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2455                 }
2456
2457                 $this->loadPageData( 'fromdbmaster' );
2458                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2459                 $id = $this->getId();
2460
2461                 if ( !$cascade ) {
2462                         $cascade = false;
2463                 }
2464
2465                 // Take this opportunity to purge out expired restrictions
2466                 Title::purgeExpiredRestrictions();
2467
2468                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2469                 // we expect a single selection, but the schema allows otherwise.
2470                 $isProtected = false;
2471                 $protect = false;
2472                 $changed = false;
2473
2474                 $dbw = wfGetDB( DB_MASTER );
2475
2476                 foreach ( $restrictionTypes as $action ) {
2477                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2478                                 $expiry[$action] = 'infinity';
2479                         }
2480                         if ( !isset( $limit[$action] ) ) {
2481                                 $limit[$action] = '';
2482                         } elseif ( $limit[$action] != '' ) {
2483                                 $protect = true;
2484                         }
2485
2486                         // Get current restrictions on $action
2487                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2488                         if ( $current != '' ) {
2489                                 $isProtected = true;
2490                         }
2491
2492                         if ( $limit[$action] != $current ) {
2493                                 $changed = true;
2494                         } elseif ( $limit[$action] != '' ) {
2495                                 // Only check expiry change if the action is actually being
2496                                 // protected, since expiry does nothing on an not-protected
2497                                 // action.
2498                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2499                                         $changed = true;
2500                                 }
2501                         }
2502                 }
2503
2504                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2505                         $changed = true;
2506                 }
2507
2508                 // If nothing has changed, do nothing
2509                 if ( !$changed ) {
2510                         return Status::newGood();
2511                 }
2512
2513                 if ( !$protect ) { // No protection at all means unprotection
2514                         $revCommentMsg = 'unprotectedarticle';
2515                         $logAction = 'unprotect';
2516                 } elseif ( $isProtected ) {
2517                         $revCommentMsg = 'modifiedarticleprotection';
2518                         $logAction = 'modify';
2519                 } else {
2520                         $revCommentMsg = 'protectedarticle';
2521                         $logAction = 'protect';
2522                 }
2523
2524                 // Truncate for whole multibyte characters
2525                 $reason = $wgContLang->truncate( $reason, 255 );
2526
2527                 $logRelationsValues = [];
2528                 $logRelationsField = null;
2529                 $logParamsDetails = [];
2530
2531                 // Null revision (used for change tag insertion)
2532                 $nullRevision = null;
2533
2534                 if ( $id ) { // Protection of existing page
2535                         if ( !Hooks::run( 'ArticleProtect', [ &$this, &$user, $limit, $reason ] ) ) {
2536                                 return Status::newGood();
2537                         }
2538
2539                         // Only certain restrictions can cascade...
2540                         $editrestriction = isset( $limit['edit'] )
2541                                 ? [ $limit['edit'] ]
2542                                 : $this->mTitle->getRestrictions( 'edit' );
2543                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2544                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2545                         }
2546                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2547                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2548                         }
2549
2550                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2551                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2552                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2553                         }
2554                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2555                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2556                         }
2557
2558                         // The schema allows multiple restrictions
2559                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2560                                 $cascade = false;
2561                         }
2562
2563                         // insert null revision to identify the page protection change as edit summary
2564                         $latest = $this->getLatest();
2565                         $nullRevision = $this->insertProtectNullRevision(
2566                                 $revCommentMsg,
2567                                 $limit,
2568                                 $expiry,
2569                                 $cascade,
2570                                 $reason,
2571                                 $user
2572                         );
2573
2574                         if ( $nullRevision === null ) {
2575                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2576                         }
2577
2578                         $logRelationsField = 'pr_id';
2579
2580                         // Update restrictions table
2581                         foreach ( $limit as $action => $restrictions ) {
2582                                 $dbw->delete(
2583                                         'page_restrictions',
2584                                         [
2585                                                 'pr_page' => $id,
2586                                                 'pr_type' => $action
2587                                         ],
2588                                         __METHOD__
2589                                 );
2590                                 if ( $restrictions != '' ) {
2591                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2592                                         $dbw->insert(
2593                                                 'page_restrictions',
2594                                                 [
2595                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2596                                                         'pr_page' => $id,
2597                                                         'pr_type' => $action,
2598                                                         'pr_level' => $restrictions,
2599                                                         'pr_cascade' => $cascadeValue,
2600                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2601                                                 ],
2602                                                 __METHOD__
2603                                         );
2604                                         $logRelationsValues[] = $dbw->insertId();
2605                                         $logParamsDetails[] = [
2606                                                 'type' => $action,
2607                                                 'level' => $restrictions,
2608                                                 'expiry' => $expiry[$action],
2609                                                 'cascade' => (bool)$cascadeValue,
2610                                         ];
2611                                 }
2612                         }
2613
2614                         // Clear out legacy restriction fields
2615                         $dbw->update(
2616                                 'page',
2617                                 [ 'page_restrictions' => '' ],
2618                                 [ 'page_id' => $id ],
2619                                 __METHOD__
2620                         );
2621
2622                         Hooks::run( 'NewRevisionFromEditComplete',
2623                                 [ $this, $nullRevision, $latest, $user ] );
2624                         Hooks::run( 'ArticleProtectComplete', [ &$this, &$user, $limit, $reason ] );
2625                 } else { // Protection of non-existing page (also known as "title protection")
2626                         // Cascade protection is meaningless in this case
2627                         $cascade = false;
2628
2629                         if ( $limit['create'] != '' ) {
2630                                 $dbw->replace( 'protected_titles',
2631                                         [ [ 'pt_namespace', 'pt_title' ] ],
2632                                         [
2633                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2634                                                 'pt_title' => $this->mTitle->getDBkey(),
2635                                                 'pt_create_perm' => $limit['create'],
2636                                                 'pt_timestamp' => $dbw->timestamp(),
2637                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2638                                                 'pt_user' => $user->getId(),
2639                                                 'pt_reason' => $reason,
2640                                         ], __METHOD__
2641                                 );
2642                                 $logParamsDetails[] = [
2643                                         'type' => 'create',
2644                                         'level' => $limit['create'],
2645                                         'expiry' => $expiry['create'],
2646                                 ];
2647                         } else {
2648                                 $dbw->delete( 'protected_titles',
2649                                         [
2650                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2651                                                 'pt_title' => $this->mTitle->getDBkey()
2652                                         ], __METHOD__
2653                                 );
2654                         }
2655                 }
2656
2657                 $this->mTitle->flushRestrictions();
2658                 InfoAction::invalidateCache( $this->mTitle );
2659
2660                 if ( $logAction == 'unprotect' ) {
2661                         $params = [];
2662                 } else {
2663                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2664                         $params = [
2665                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2666                                 '5:bool:cascade' => $cascade,
2667                                 'details' => $logParamsDetails, // parameter for localize and api
2668                         ];
2669                 }
2670
2671                 // Update the protection log
2672                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2673                 $logEntry->setTarget( $this->mTitle );
2674                 $logEntry->setComment( $reason );
2675                 $logEntry->setPerformer( $user );
2676                 $logEntry->setParameters( $params );
2677                 if ( !is_null( $nullRevision ) ) {
2678                         $logEntry->setAssociatedRevId( $nullRevision->getId() );
2679                 }
2680                 $logEntry->setTags( $tags );
2681                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2682                         $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
2683                 }
2684                 $logId = $logEntry->insert();
2685                 $logEntry->publish( $logId );
2686
2687                 return Status::newGood( $logId );
2688         }
2689
2690         /**
2691          * Insert a new null revision for this page.
2692          *
2693          * @param string $revCommentMsg Comment message key for the revision
2694          * @param array $limit Set of restriction keys
2695          * @param array $expiry Per restriction type expiration
2696          * @param int $cascade Set to false if cascading protection isn't allowed.
2697          * @param string $reason
2698          * @param User|null $user
2699          * @return Revision|null Null on error
2700          */
2701         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2702                 array $expiry, $cascade, $reason, $user = null
2703         ) {
2704                 global $wgContLang;
2705                 $dbw = wfGetDB( DB_MASTER );
2706
2707                 // Prepare a null revision to be added to the history
2708                 $editComment = $wgContLang->ucfirst(
2709                         wfMessage(
2710                                 $revCommentMsg,
2711                                 $this->mTitle->getPrefixedText()
2712                         )->inContentLanguage()->text()
2713                 );
2714                 if ( $reason ) {
2715                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2716                 }
2717                 $protectDescription = $this->protectDescription( $limit, $expiry );
2718                 if ( $protectDescription ) {
2719                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2720                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2721                                 ->inContentLanguage()->text();
2722                 }
2723                 if ( $cascade ) {
2724                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2725                         $editComment .= wfMessage( 'brackets' )->params(
2726                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2727                         )->inContentLanguage()->text();
2728                 }
2729
2730                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2731                 if ( $nullRev ) {
2732                         $nullRev->insertOn( $dbw );
2733
2734                         // Update page record and touch page
2735                         $oldLatest = $nullRev->getParentId();
2736                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2737                 }
2738
2739                 return $nullRev;
2740         }
2741
2742         /**
2743          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2744          * @return string
2745          */
2746         protected function formatExpiry( $expiry ) {
2747                 global $wgContLang;
2748
2749                 if ( $expiry != 'infinity' ) {
2750                         return wfMessage(
2751                                 'protect-expiring',
2752                                 $wgContLang->timeanddate( $expiry, false, false ),
2753                                 $wgContLang->date( $expiry, false, false ),
2754                                 $wgContLang->time( $expiry, false, false )
2755                         )->inContentLanguage()->text();
2756                 } else {
2757                         return wfMessage( 'protect-expiry-indefinite' )
2758                                 ->inContentLanguage()->text();
2759                 }
2760         }
2761
2762         /**
2763          * Builds the description to serve as comment for the edit.
2764          *
2765          * @param array $limit Set of restriction keys
2766          * @param array $expiry Per restriction type expiration
2767          * @return string
2768          */
2769         public function protectDescription( array $limit, array $expiry ) {
2770                 $protectDescription = '';
2771
2772                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2773                         # $action is one of $wgRestrictionTypes = [ 'create', 'edit', 'move', 'upload' ].
2774                         # All possible message keys are listed here for easier grepping:
2775                         # * restriction-create
2776                         # * restriction-edit
2777                         # * restriction-move
2778                         # * restriction-upload
2779                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2780                         # $restrictions is one of $wgRestrictionLevels = [ '', 'autoconfirmed', 'sysop' ],
2781                         # with '' filtered out. All possible message keys are listed below:
2782                         # * protect-level-autoconfirmed
2783                         # * protect-level-sysop
2784                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
2785                                 ->inContentLanguage()->text();
2786
2787                         $expiryText = $this->formatExpiry( $expiry[$action] );
2788
2789                         if ( $protectDescription !== '' ) {
2790                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2791                         }
2792                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2793                                 ->params( $actionText, $restrictionsText, $expiryText )
2794                                 ->inContentLanguage()->text();
2795                 }
2796
2797                 return $protectDescription;
2798         }
2799
2800         /**
2801          * Builds the description to serve as comment for the log entry.
2802          *
2803          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2804          * protect description text. Keep them in old format to avoid breaking compatibility.
2805          * TODO: Fix protection log to store structured description and format it on-the-fly.
2806          *
2807          * @param array $limit Set of restriction keys
2808          * @param array $expiry Per restriction type expiration
2809          * @return string
2810          */
2811         public function protectDescriptionLog( array $limit, array $expiry ) {
2812                 global $wgContLang;
2813
2814                 $protectDescriptionLog = '';
2815
2816                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2817                         $expiryText = $this->formatExpiry( $expiry[$action] );
2818                         $protectDescriptionLog .= $wgContLang->getDirMark() .
2819                                 "[$action=$restrictions] ($expiryText)";
2820                 }
2821
2822                 return trim( $protectDescriptionLog );
2823         }
2824
2825         /**
2826          * Take an array of page restrictions and flatten it to a string
2827          * suitable for insertion into the page_restrictions field.
2828          *
2829          * @param string[] $limit
2830          *
2831          * @throws MWException
2832          * @return string
2833          */
2834         protected static function flattenRestrictions( $limit ) {
2835                 if ( !is_array( $limit ) ) {
2836                         throw new MWException( __METHOD__ . ' given non-array restriction set' );
2837                 }
2838
2839                 $bits = [];
2840                 ksort( $limit );
2841
2842                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2843                         $bits[] = "$action=$restrictions";
2844                 }
2845
2846                 return implode( ':', $bits );
2847         }
2848
2849         /**
2850          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2851          * backwards compatibility, if you care about error reporting you should use
2852          * doDeleteArticleReal() instead.
2853          *
2854          * Deletes the article with database consistency, writes logs, purges caches
2855          *
2856          * @param string $reason Delete reason for deletion log
2857          * @param bool $suppress Suppress all revisions and log the deletion in
2858          *        the suppression log instead of the deletion log
2859          * @param int $u1 Unused
2860          * @param bool $u2 Unused
2861          * @param array|string &$error Array of errors to append to
2862          * @param User $user The deleting user
2863          * @return bool True if successful
2864          */
2865         public function doDeleteArticle(
2866                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2867         ) {
2868                 $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
2869                 return $status->isGood();
2870         }
2871
2872         /**
2873          * Back-end article deletion
2874          * Deletes the article with database consistency, writes logs, purges caches
2875          *
2876          * @since 1.19
2877          *
2878          * @param string $reason Delete reason for deletion log
2879          * @param bool $suppress Suppress all revisions and log the deletion in
2880          *   the suppression log instead of the deletion log
2881          * @param int $u1 Unused
2882          * @param bool $u2 Unused
2883          * @param array|string &$error Array of errors to append to
2884          * @param User $user The deleting user
2885          * @param array $tags Tags to apply to the deletion action
2886          * @return Status Status object; if successful, $status->value is the log_id of the
2887          *   deletion log entry. If the page couldn't be deleted because it wasn't
2888          *   found, $status is a non-fatal 'cannotdelete' error
2889          */
2890         public function doDeleteArticleReal(
2891                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2892                 $tags = []
2893         ) {
2894                 global $wgUser, $wgContentHandlerUseDB;
2895
2896                 wfDebug( __METHOD__ . "\n" );
2897
2898                 $status = Status::newGood();
2899
2900                 if ( $this->mTitle->getDBkey() === '' ) {
2901                         $status->error( 'cannotdelete',
2902                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2903                         return $status;
2904                 }
2905
2906                 $user = is_null( $user ) ? $wgUser : $user;
2907                 if ( !Hooks::run( 'ArticleDelete',
2908                         [ &$this, &$user, &$reason, &$error, &$status, $suppress ]
2909                 ) ) {
2910                         if ( $status->isOK() ) {
2911                                 // Hook aborted but didn't set a fatal status
2912                                 $status->fatal( 'delete-hook-aborted' );
2913                         }
2914                         return $status;
2915                 }
2916
2917                 $dbw = wfGetDB( DB_MASTER );
2918                 $dbw->startAtomic( __METHOD__ );
2919
2920                 $this->loadPageData( self::READ_LATEST );
2921                 $id = $this->getId();
2922                 // T98706: lock the page from various other updates but avoid using
2923                 // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2924                 // the revisions queries (which also JOIN on user). Only lock the page
2925                 // row and CAS check on page_latest to see if the trx snapshot matches.
2926                 $lockedLatest = $this->lockAndGetLatest();
2927                 if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
2928                         $dbw->endAtomic( __METHOD__ );
2929                         // Page not there or trx snapshot is stale
2930                         $status->error( 'cannotdelete',
2931                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2932                         return $status;
2933                 }
2934
2935                 // Given the lock above, we can be confident in the title and page ID values
2936                 $namespace = $this->getTitle()->getNamespace();
2937                 $dbKey = $this->getTitle()->getDBkey();
2938
2939                 // At this point we are now comitted to returning an OK
2940                 // status unless some DB query error or other exception comes up.
2941                 // This way callers don't have to call rollback() if $status is bad
2942                 // unless they actually try to catch exceptions (which is rare).
2943
2944                 // we need to remember the old content so we can use it to generate all deletion updates.
2945                 try {
2946                         $content = $this->getContent( Revision::RAW );
2947                 } catch ( Exception $ex ) {
2948                         wfLogWarning( __METHOD__ . ': failed to load content during deletion! '
2949                                 . $ex->getMessage() );
2950
2951                         $content = null;
2952                 }
2953
2954                 // Bitfields to further suppress the content
2955                 if ( $suppress ) {
2956                         $bitfield = 0;
2957                         // This should be 15...
2958                         $bitfield |= Revision::DELETED_TEXT;
2959                         $bitfield |= Revision::DELETED_COMMENT;
2960                         $bitfield |= Revision::DELETED_USER;
2961                         $bitfield |= Revision::DELETED_RESTRICTED;
2962                         $deletionFields = [ $dbw->addQuotes( $bitfield ) . ' AS deleted' ];
2963                 } else {
2964                         $deletionFields = [ 'rev_deleted AS deleted' ];
2965                 }
2966
2967                 // For now, shunt the revision data into the archive table.
2968                 // Text is *not* removed from the text table; bulk storage
2969                 // is left intact to avoid breaking block-compression or
2970                 // immutable storage schemes.
2971                 // In the future, we may keep revisions and mark them with
2972                 // the rev_deleted field, which is reserved for this purpose.
2973
2974                 // Get all of the page revisions
2975                 $fields = array_diff( Revision::selectFields(), [ 'rev_deleted' ] );
2976                 $res = $dbw->select(
2977                         'revision',
2978                         array_merge( $fields, $deletionFields ),
2979                         [ 'rev_page' => $id ],
2980                         __METHOD__,
2981                         'FOR UPDATE'
2982                 );
2983                 // Build their equivalent archive rows
2984                 $rowsInsert = [];
2985                 foreach ( $res as $row ) {
2986                         $rowInsert = [
2987                                 'ar_namespace'  => $namespace,
2988                                 'ar_title'      => $dbKey,
2989                                 'ar_comment'    => $row->rev_comment,
2990                                 'ar_user'       => $row->rev_user,
2991                                 'ar_user_text'  => $row->rev_user_text,
2992                                 'ar_timestamp'  => $row->rev_timestamp,
2993                                 'ar_minor_edit' => $row->rev_minor_edit,
2994                                 'ar_rev_id'     => $row->rev_id,
2995                                 'ar_parent_id'  => $row->rev_parent_id,
2996                                 'ar_text_id'    => $row->rev_text_id,
2997                                 'ar_text'       => '',
2998                                 'ar_flags'      => '',
2999                                 'ar_len'        => $row->rev_len,
3000                                 'ar_page_id'    => $id,
3001                                 'ar_deleted'    => $row->deleted,
3002                                 'ar_sha1'       => $row->rev_sha1,
3003                         ];
3004                         if ( $wgContentHandlerUseDB ) {
3005                                 $rowInsert['ar_content_model'] = $row->rev_content_model;
3006                                 $rowInsert['ar_content_format'] = $row->rev_content_format;
3007                         }
3008                         $rowsInsert[] = $rowInsert;
3009                 }
3010                 // Copy them into the archive table
3011                 $dbw->insert( 'archive', $rowsInsert, __METHOD__ );
3012                 // Save this so we can pass it to the ArticleDeleteComplete hook.
3013                 $archivedRevisionCount = $dbw->affectedRows();
3014
3015                 // Clone the title and wikiPage, so we have the information we need when
3016                 // we log and run the ArticleDeleteComplete hook.
3017                 $logTitle = clone $this->mTitle;
3018                 $wikiPageBeforeDelete = clone $this;
3019
3020                 // Now that it's safely backed up, delete it
3021                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
3022                 $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
3023
3024                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
3025                 $logtype = $suppress ? 'suppress' : 'delete';
3026
3027                 $logEntry = new ManualLogEntry( $logtype, 'delete' );
3028                 $logEntry->setPerformer( $user );
3029                 $logEntry->setTarget( $logTitle );
3030                 $logEntry->setComment( $reason );
3031                 $logEntry->setTags( $tags );
3032                 $logid = $logEntry->insert();
3033
3034                 $dbw->onTransactionPreCommitOrIdle(
3035                         function () use ( $dbw, $logEntry, $logid ) {
3036                                 // Bug 56776: avoid deadlocks (especially from FileDeleteForm)
3037                                 $logEntry->publish( $logid );
3038                         },
3039                         __METHOD__
3040                 );
3041
3042                 $dbw->endAtomic( __METHOD__ );
3043
3044                 $this->doDeleteUpdates( $id, $content );
3045
3046                 Hooks::run( 'ArticleDeleteComplete', [
3047                         &$wikiPageBeforeDelete,
3048                         &$user,
3049                         $reason,
3050                         $id,
3051                         $content,
3052                         $logEntry,
3053                         $archivedRevisionCount
3054                 ] );
3055                 $status->value = $logid;
3056
3057                 // Show log excerpt on 404 pages rather than just a link
3058                 $cache = ObjectCache::getMainStashInstance();
3059                 $key = wfMemcKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
3060                 $cache->set( $key, 1, $cache::TTL_DAY );
3061
3062                 return $status;
3063         }
3064
3065         /**
3066          * Lock the page row for this title+id and return page_latest (or 0)
3067          *
3068          * @return integer Returns 0 if no row was found with this title+id
3069          * @since 1.27
3070          */
3071         public function lockAndGetLatest() {
3072                 return (int)wfGetDB( DB_MASTER )->selectField(
3073                         'page',
3074                         'page_latest',
3075                         [
3076                                 'page_id' => $this->getId(),
3077                                 // Typically page_id is enough, but some code might try to do
3078                                 // updates assuming the title is the same, so verify that
3079                                 'page_namespace' => $this->getTitle()->getNamespace(),
3080                                 'page_title' => $this->getTitle()->getDBkey()
3081                         ],
3082                         __METHOD__,
3083                         [ 'FOR UPDATE' ]
3084                 );
3085         }
3086
3087         /**
3088          * Do some database updates after deletion
3089          *
3090          * @param int $id The page_id value of the page being deleted
3091          * @param Content $content Optional page content to be used when determining
3092          *   the required updates. This may be needed because $this->getContent()
3093          *   may already return null when the page proper was deleted.
3094          */
3095         public function doDeleteUpdates( $id, Content $content = null ) {
3096                 try {
3097                         $countable = $this->isCountable();
3098                 } catch ( Exception $ex ) {
3099                         // fallback for deleting broken pages for which we cannot load the content for
3100                         // some reason. Note that doDeleteArticleReal() already logged this problem.
3101                         $countable = false;
3102                 }
3103
3104                 // Update site status
3105                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$countable, -1 ) );
3106
3107                 // Delete pagelinks, update secondary indexes, etc
3108                 $updates = $this->getDeletionUpdates( $content );
3109                 foreach ( $updates as $update ) {
3110                         DeferredUpdates::addUpdate( $update );
3111                 }
3112
3113                 // Reparse any pages transcluding this page
3114                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
3115
3116                 // Reparse any pages including this image
3117                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
3118                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
3119                 }
3120
3121                 // Clear caches
3122                 WikiPage::onArticleDelete( $this->mTitle );
3123
3124                 // Reset this object and the Title object
3125                 $this->loadFromRow( false, self::READ_LATEST );
3126
3127                 // Search engine
3128                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
3129         }
3130
3131         /**
3132          * Roll back the most recent consecutive set of edits to a page
3133          * from the same user; fails if there are no eligible edits to
3134          * roll back to, e.g. user is the sole contributor. This function
3135          * performs permissions checks on $user, then calls commitRollback()
3136          * to do the dirty work
3137          *
3138          * @todo Separate the business/permission stuff out from backend code
3139          * @todo Remove $token parameter. Already verified by RollbackAction and ApiRollback.
3140          *
3141          * @param string $fromP Name of the user whose edits to rollback.
3142          * @param string $summary Custom summary. Set to default summary if empty.
3143          * @param string $token Rollback token.
3144          * @param bool $bot If true, mark all reverted edits as bot.
3145          *
3146          * @param array $resultDetails Array contains result-specific array of additional values
3147          *    'alreadyrolled' : 'current' (rev)
3148          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3149          *
3150          * @param User $user The user performing the rollback
3151          * @param array|null $tags Change tags to apply to the rollback
3152          * Callers are responsible for permission checks
3153          * (with ChangeTags::canAddTagsAccompanyingChange)
3154          *
3155          * @return array Array of errors, each error formatted as
3156          *   array(messagekey, param1, param2, ...).
3157          * On success, the array is empty.  This array can also be passed to
3158          * OutputPage::showPermissionsErrorPage().
3159          */
3160         public function doRollback(
3161                 $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
3162         ) {
3163                 $resultDetails = null;
3164
3165                 // Check permissions
3166                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
3167                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
3168                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3169
3170                 if ( !$user->matchEditToken( $token, 'rollback' ) ) {
3171                         $errors[] = [ 'sessionfailure' ];
3172                 }
3173
3174                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
3175                         $errors[] = [ 'actionthrottledtext' ];
3176                 }
3177
3178                 // If there were errors, bail out now
3179                 if ( !empty( $errors ) ) {
3180                         return $errors;
3181                 }
3182
3183                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
3184         }
3185
3186         /**
3187          * Backend implementation of doRollback(), please refer there for parameter
3188          * and return value documentation
3189          *
3190          * NOTE: This function does NOT check ANY permissions, it just commits the
3191          * rollback to the DB. Therefore, you should only call this function direct-
3192          * ly if you want to use custom permissions checks. If you don't, use
3193          * doRollback() instead.
3194          * @param string $fromP Name of the user whose edits to rollback.
3195          * @param string $summary Custom summary. Set to default summary if empty.
3196          * @param bool $bot If true, mark all reverted edits as bot.
3197          *
3198          * @param array $resultDetails Contains result-specific array of additional values
3199          * @param User $guser The user performing the rollback
3200          * @param array|null $tags Change tags to apply to the rollback
3201          * Callers are responsible for permission checks
3202          * (with ChangeTags::canAddTagsAccompanyingChange)
3203          *
3204          * @return array
3205          */
3206         public function commitRollback( $fromP, $summary, $bot,
3207                 &$resultDetails, User $guser, $tags = null
3208         ) {
3209                 global $wgUseRCPatrol, $wgContLang;
3210
3211                 $dbw = wfGetDB( DB_MASTER );
3212
3213                 if ( wfReadOnly() ) {
3214                         return [ [ 'readonlytext' ] ];
3215                 }
3216
3217                 // Get the last editor
3218                 $current = $this->getRevision();
3219                 if ( is_null( $current ) ) {
3220                         // Something wrong... no page?
3221                         return [ [ 'notanarticle' ] ];
3222                 }
3223
3224                 $from = str_replace( '_', ' ', $fromP );
3225                 // User name given should match up with the top revision.
3226                 // If the user was deleted then $from should be empty.
3227                 if ( $from != $current->getUserText() ) {
3228                         $resultDetails = [ 'current' => $current ];
3229                         return [ [ 'alreadyrolled',
3230                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3231                                 htmlspecialchars( $fromP ),
3232                                 htmlspecialchars( $current->getUserText() )
3233                         ] ];
3234                 }
3235
3236                 // Get the last edit not by this person...
3237                 // Note: these may not be public values
3238                 $user = intval( $current->getUser( Revision::RAW ) );
3239                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3240                 $s = $dbw->selectRow( 'revision',
3241                         [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
3242                         [ 'rev_page' => $current->getPage(),
3243                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3244                         ], __METHOD__,
3245                         [ 'USE INDEX' => 'page_timestamp',
3246                                 'ORDER BY' => 'rev_timestamp DESC' ]
3247                         );
3248                 if ( $s === false ) {
3249                         // No one else ever edited this page
3250                         return [ [ 'cantrollback' ] ];
3251                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3252                         || $s->rev_deleted & Revision::DELETED_USER
3253                 ) {
3254                         // Only admins can see this text
3255                         return [ [ 'notvisiblerev' ] ];
3256                 }
3257
3258                 // Generate the edit summary if necessary
3259                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3260                 if ( empty( $summary ) ) {
3261                         if ( $from == '' ) { // no public user name
3262                                 $summary = wfMessage( 'revertpage-nouser' );
3263                         } else {
3264                                 $summary = wfMessage( 'revertpage' );
3265                         }
3266                 }
3267
3268                 // Allow the custom summary to use the same args as the default message
3269                 $args = [
3270                         $target->getUserText(), $from, $s->rev_id,
3271                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3272                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3273                 ];
3274                 if ( $summary instanceof Message ) {
3275                         $summary = $summary->params( $args )->inContentLanguage()->text();
3276                 } else {
3277                         $summary = wfMsgReplaceArgs( $summary, $args );
3278                 }
3279
3280                 // Trim spaces on user supplied text
3281                 $summary = trim( $summary );
3282
3283                 // Truncate for whole multibyte characters.
3284                 $summary = $wgContLang->truncate( $summary, 255 );
3285
3286                 // Save
3287                 $flags = EDIT_UPDATE | EDIT_INTERNAL;
3288
3289                 if ( $guser->isAllowed( 'minoredit' ) ) {
3290                         $flags |= EDIT_MINOR;
3291                 }
3292
3293                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3294                         $flags |= EDIT_FORCE_BOT;
3295                 }
3296
3297                 $targetContent = $target->getContent();
3298                 $changingContentModel = $targetContent->getModel() !== $current->getContentModel();
3299
3300                 // Actually store the edit
3301                 $status = $this->doEditContent(
3302                         $targetContent,
3303                         $summary,
3304                         $flags,
3305                         $target->getId(),
3306                         $guser,
3307                         null,
3308                         $tags
3309                 );
3310
3311                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3312                 // This is done even on edit failure to have patrolling in that case (bug 62157).
3313                 $set = [];
3314                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3315                         // Mark all reverted edits as bot
3316                         $set['rc_bot'] = 1;
3317                 }
3318
3319                 if ( $wgUseRCPatrol ) {
3320                         // Mark all reverted edits as patrolled
3321                         $set['rc_patrolled'] = 1;
3322                 }
3323
3324                 if ( count( $set ) ) {
3325                         $dbw->update( 'recentchanges', $set,
3326                                 [ /* WHERE */
3327                                         'rc_cur_id' => $current->getPage(),
3328                                         'rc_user_text' => $current->getUserText(),
3329                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3330                                 ],
3331                                 __METHOD__
3332                         );
3333                 }
3334
3335                 if ( !$status->isOK() ) {
3336                         return $status->getErrorsArray();
3337                 }
3338
3339                 // raise error, when the edit is an edit without a new version
3340                 $statusRev = isset( $status->value['revision'] )
3341                         ? $status->value['revision']
3342                         : null;
3343                 if ( !( $statusRev instanceof Revision ) ) {
3344                         $resultDetails = [ 'current' => $current ];
3345                         return [ [ 'alreadyrolled',
3346                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3347                                         htmlspecialchars( $fromP ),
3348                                         htmlspecialchars( $current->getUserText() )
3349                         ] ];
3350                 }
3351
3352                 if ( $changingContentModel ) {
3353                         // If the content model changed during the rollback,
3354                         // make sure it gets logged to Special:Log/contentmodel
3355                         $log = new ManualLogEntry( 'contentmodel', 'change' );
3356                         $log->setPerformer( $guser );
3357                         $log->setTarget( $this->mTitle );
3358                         $log->setComment( $summary );
3359                         $log->setParameters( [
3360                                 '4::oldmodel' => $current->getContentModel(),
3361                                 '5::newmodel' => $targetContent->getModel(),
3362                         ] );
3363
3364                         $logId = $log->insert( $dbw );
3365                         $log->publish( $logId );
3366                 }
3367
3368                 $revId = $statusRev->getId();
3369
3370                 Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );
3371
3372                 $resultDetails = [
3373                         'summary' => $summary,
3374                         'current' => $current,
3375                         'target' => $target,
3376                         'newid' => $revId
3377                 ];
3378
3379                 return [];
3380         }
3381
3382         /**
3383          * The onArticle*() functions are supposed to be a kind of hooks
3384          * which should be called whenever any of the specified actions
3385          * are done.
3386          *
3387          * This is a good place to put code to clear caches, for instance.
3388          *
3389          * This is called on page move and undelete, as well as edit
3390          *
3391          * @param Title $title
3392          */
3393         public static function onArticleCreate( Title $title ) {
3394                 // Update existence markers on article/talk tabs...
3395                 $other = $title->getOtherPage();
3396
3397                 $other->purgeSquid();
3398
3399                 $title->touchLinks();
3400                 $title->purgeSquid();
3401                 $title->deleteTitleProtection();
3402
3403                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3404
3405                 if ( $title->getNamespace() == NS_CATEGORY ) {
3406                         // Load the Category object, which will schedule a job to create
3407                         // the category table row if necessary. Checking a replica DB is ok
3408                         // here, in the worst case it'll run an unnecessary recount job on
3409                         // a category that probably doesn't have many members.
3410                         Category::newFromTitle( $title )->getID();
3411                 }
3412         }
3413
3414         /**
3415          * Clears caches when article is deleted
3416          *
3417          * @param Title $title
3418          */
3419         public static function onArticleDelete( Title $title ) {
3420                 global $wgContLang;
3421
3422                 // Update existence markers on article/talk tabs...
3423                 $other = $title->getOtherPage();
3424
3425                 $other->purgeSquid();
3426
3427                 $title->touchLinks();
3428                 $title->purgeSquid();
3429
3430                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3431
3432                 // File cache
3433                 HTMLFileCache::clearFileCache( $title );
3434                 InfoAction::invalidateCache( $title );
3435
3436                 // Messages
3437                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3438                         MessageCache::singleton()->replace( $title->getDBkey(), false );
3439
3440                         if ( $wgContLang->hasVariants() ) {
3441                                 $wgContLang->updateConversionTable( $title );
3442                         }
3443                 }
3444
3445                 // Images
3446                 if ( $title->getNamespace() == NS_FILE ) {
3447                         DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
3448                 }
3449
3450                 // User talk pages
3451                 if ( $title->getNamespace() == NS_USER_TALK ) {
3452                         $user = User::newFromName( $title->getText(), false );
3453                         if ( $user ) {
3454                                 $user->setNewtalk( false );
3455                         }
3456                 }
3457
3458                 // Image redirects
3459                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3460         }
3461
3462         /**
3463          * Purge caches on page update etc
3464          *
3465          * @param Title $title
3466          * @param Revision|null $revision Revision that was just saved, may be null
3467          */
3468         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3469                 // Invalidate caches of articles which include this page
3470                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3471
3472                 // Invalidate the caches of all pages which redirect here
3473                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
3474
3475                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3476
3477                 // Purge CDN for this page only
3478                 $title->purgeSquid();
3479                 // Clear file cache for this page only
3480                 HTMLFileCache::clearFileCache( $title );
3481
3482                 $revid = $revision ? $revision->getId() : null;
3483                 DeferredUpdates::addCallableUpdate( function() use ( $title, $revid ) {
3484                         InfoAction::invalidateCache( $title, $revid );
3485                 } );
3486         }
3487
3488         /**#@-*/
3489
3490         /**
3491          * Returns a list of categories this page is a member of.
3492          * Results will include hidden categories
3493          *
3494          * @return TitleArray
3495          */
3496         public function getCategories() {
3497                 $id = $this->getId();
3498                 if ( $id == 0 ) {
3499                         return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
3500                 }
3501
3502                 $dbr = wfGetDB( DB_REPLICA );
3503                 $res = $dbr->select( 'categorylinks',
3504                         [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
3505                         // Have to do that since Database::fieldNamesWithAlias treats numeric indexes
3506                         // as not being aliases, and NS_CATEGORY is numeric
3507                         [ 'cl_from' => $id ],
3508                         __METHOD__ );
3509
3510                 return TitleArray::newFromResult( $res );
3511         }
3512
3513         /**
3514          * Returns a list of hidden categories this page is a member of.
3515          * Uses the page_props and categorylinks tables.
3516          *
3517          * @return array Array of Title objects
3518          */
3519         public function getHiddenCategories() {
3520                 $result = [];
3521                 $id = $this->getId();
3522
3523                 if ( $id == 0 ) {
3524                         return [];
3525                 }
3526
3527                 $dbr = wfGetDB( DB_REPLICA );
3528                 $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
3529                         [ 'cl_to' ],
3530                         [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3531                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
3532                         __METHOD__ );
3533
3534                 if ( $res !== false ) {
3535                         foreach ( $res as $row ) {
3536                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3537                         }
3538                 }
3539
3540                 return $result;
3541         }
3542
3543         /**
3544          * Return an applicable autosummary if one exists for the given edit.
3545          * @param string|null $oldtext The previous text of the page.
3546          * @param string|null $newtext The submitted text of the page.
3547          * @param int $flags Bitmask: a bitmask of flags submitted for the edit.
3548          * @return string An appropriate autosummary, or an empty string.
3549          *
3550          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
3551          */
3552         public static function getAutosummary( $oldtext, $newtext, $flags ) {
3553                 // NOTE: stub for backwards-compatibility. assumes the given text is
3554                 // wikitext. will break horribly if it isn't.
3555
3556                 wfDeprecated( __METHOD__, '1.21' );
3557
3558                 $handler = ContentHandler::getForModelID( CONTENT_MODEL_WIKITEXT );
3559                 $oldContent = is_null( $oldtext ) ? null : $handler->unserializeContent( $oldtext );
3560                 $newContent = is_null( $newtext ) ? null : $handler->unserializeContent( $newtext );
3561
3562                 return $handler->getAutosummary( $oldContent, $newContent, $flags );
3563         }
3564
3565         /**
3566          * Auto-generates a deletion reason
3567          *
3568          * @param bool &$hasHistory Whether the page has a history
3569          * @return string|bool String containing deletion reason or empty string, or boolean false
3570          *    if no revision occurred
3571          */
3572         public function getAutoDeleteReason( &$hasHistory ) {
3573                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3574         }
3575
3576         /**
3577          * Update all the appropriate counts in the category table, given that
3578          * we've added the categories $added and deleted the categories $deleted.
3579          *
3580          * @param array $added The names of categories that were added
3581          * @param array $deleted The names of categories that were deleted
3582          * @param integer $id Page ID (this should be the original deleted page ID)
3583          */
3584         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
3585                 $id = $id ?: $this->getId();
3586                 $dbw = wfGetDB( DB_MASTER );
3587                 $method = __METHOD__;
3588                 // Do this at the end of the commit to reduce lock wait timeouts
3589                 $dbw->onTransactionPreCommitOrIdle(
3590                         function () use ( $dbw, $added, $deleted, $id, $method ) {
3591                                 $ns = $this->getTitle()->getNamespace();
3592
3593                                 $addFields = [ 'cat_pages = cat_pages + 1' ];
3594                                 $removeFields = [ 'cat_pages = cat_pages - 1' ];
3595                                 if ( $ns == NS_CATEGORY ) {
3596                                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3597                                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3598                                 } elseif ( $ns == NS_FILE ) {
3599                                         $addFields[] = 'cat_files = cat_files + 1';
3600                                         $removeFields[] = 'cat_files = cat_files - 1';
3601                                 }
3602
3603                                 if ( count( $added ) ) {
3604                                         $existingAdded = $dbw->selectFieldValues(
3605                                                 'category',
3606                                                 'cat_title',
3607                                                 [ 'cat_title' => $added ],
3608                                                 $method
3609                                         );
3610
3611                                         // For category rows that already exist, do a plain
3612                                         // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
3613                                         // to avoid creating gaps in the cat_id sequence.
3614                                         if ( count( $existingAdded ) ) {
3615                                                 $dbw->update(
3616                                                         'category',
3617                                                         $addFields,
3618                                                         [ 'cat_title' => $existingAdded ],
3619                                                         $method
3620                                                 );
3621                                         }
3622
3623                                         $missingAdded = array_diff( $added, $existingAdded );
3624                                         if ( count( $missingAdded ) ) {
3625                                                 $insertRows = [];
3626                                                 foreach ( $missingAdded as $cat ) {
3627                                                         $insertRows[] = [
3628                                                                 'cat_title'   => $cat,
3629                                                                 'cat_pages'   => 1,
3630                                                                 'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3631                                                                 'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3632                                                         ];
3633                                                 }
3634                                                 $dbw->upsert(
3635                                                         'category',
3636                                                         $insertRows,
3637                                                         [ 'cat_title' ],
3638                                                         $addFields,
3639                                                         $method
3640                                                 );
3641                                         }
3642                                 }
3643
3644                                 if ( count( $deleted ) ) {
3645                                         $dbw->update(
3646                                                 'category',
3647                                                 $removeFields,
3648                                                 [ 'cat_title' => $deleted ],
3649                                                 $method
3650                                         );
3651                                 }
3652
3653                                 foreach ( $added as $catName ) {
3654                                         $cat = Category::newFromName( $catName );
3655                                         Hooks::run( 'CategoryAfterPageAdded', [ $cat, $this ] );
3656                                 }
3657
3658                                 foreach ( $deleted as $catName ) {
3659                                         $cat = Category::newFromName( $catName );
3660                                         Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $this, $id ] );
3661                                 }
3662
3663                                 // Refresh counts on categories that should be empty now, to
3664                                 // trigger possible deletion. Check master for the most
3665                                 // up-to-date cat_pages.
3666                                 if ( count( $deleted ) ) {
3667                                         $rows = $dbw->select(
3668                                                 'category',
3669                                                 [ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ],
3670                                                 [ 'cat_title' => $deleted, 'cat_pages <= 0' ],
3671                                                 $method
3672                                         );
3673                                         foreach ( $rows as $row ) {
3674                                                 $cat = Category::newFromRow( $row );
3675                                                 $cat->refreshCounts();
3676                                         }
3677                                 }
3678                         },
3679                         __METHOD__
3680                 );
3681         }
3682
3683         /**
3684          * Opportunistically enqueue link update jobs given fresh parser output if useful
3685          *
3686          * @param ParserOutput $parserOutput Current version page output
3687          * @since 1.25
3688          */
3689         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3690                 if ( wfReadOnly() ) {
3691                         return;
3692                 }
3693
3694                 if ( !Hooks::run( 'OpportunisticLinksUpdate',
3695                         [ $this, $this->mTitle, $parserOutput ]
3696                 ) ) {
3697                         return;
3698                 }
3699
3700                 $config = RequestContext::getMain()->getConfig();
3701
3702                 $params = [
3703                         'isOpportunistic' => true,
3704                         'rootJobTimestamp' => $parserOutput->getCacheTime()
3705                 ];
3706
3707                 if ( $this->mTitle->areRestrictionsCascading() ) {
3708                         // If the page is cascade protecting, the links should really be up-to-date
3709                         JobQueueGroup::singleton()->lazyPush(
3710                                 RefreshLinksJob::newPrioritized( $this->mTitle, $params )
3711                         );
3712                 } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
3713                         // Assume the output contains "dynamic" time/random based magic words.
3714                         // Only update pages that expired due to dynamic content and NOT due to edits
3715                         // to referenced templates/files. When the cache expires due to dynamic content,
3716                         // page_touched is unchanged. We want to avoid triggering redundant jobs due to
3717                         // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
3718                         // template/file edit already triggered recursive RefreshLinksJob jobs.
3719                         if ( $this->getLinksTimestamp() > $this->getTouched() ) {
3720                                 // If a page is uncacheable, do not keep spamming a job for it.
3721                                 // Although it would be de-duplicated, it would still waste I/O.
3722                                 $cache = ObjectCache::getLocalClusterInstance();
3723                                 $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
3724                                 $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
3725                                 if ( $cache->add( $key, time(), $ttl ) ) {
3726                                         JobQueueGroup::singleton()->lazyPush(
3727                                                 RefreshLinksJob::newDynamic( $this->mTitle, $params )
3728                                         );
3729                                 }
3730                         }
3731                 }
3732         }
3733
3734         /**
3735          * Returns a list of updates to be performed when this page is deleted. The
3736          * updates should remove any information about this page from secondary data
3737          * stores such as links tables.
3738          *
3739          * @param Content|null $content Optional Content object for determining the
3740          *   necessary updates.
3741          * @return DeferrableUpdate[]
3742          */
3743         public function getDeletionUpdates( Content $content = null ) {
3744                 if ( !$content ) {
3745                         // load content object, which may be used to determine the necessary updates.
3746                         // XXX: the content may not be needed to determine the updates.
3747                         try {
3748                                 $content = $this->getContent( Revision::RAW );
3749                         } catch ( Exception $ex ) {
3750                                 // If we can't load the content, something is wrong. Perhaps that's why
3751                                 // the user is trying to delete the page, so let's not fail in that case.
3752                                 // Note that doDeleteArticleReal() will already have logged an issue with
3753                                 // loading the content.
3754                         }
3755                 }
3756
3757                 if ( !$content ) {
3758                         $updates = [];
3759                 } else {
3760                         $updates = $content->getDeletionUpdates( $this );
3761                 }
3762
3763                 Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
3764                 return $updates;
3765         }
3766
3767         /**
3768          * Whether this content displayed on this page
3769          * comes from the local database
3770          *
3771          * @since 1.28
3772          * @return bool
3773          */
3774         public function isLocal() {
3775                 return true;
3776         }
3777 }