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