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\Edit\PreparedEdit;
  24 use \MediaWiki\Logger\LoggerFactory;
  25 use \MediaWiki\MediaWikiServices;
  26 use Wikimedia\Rdbms\FakeResultWrapper;
  27 use Wikimedia\Rdbms\IDatabase;
  28 use Wikimedia\Rdbms\DBError;
  29 use Wikimedia\Rdbms\DBUnexpectedError;
  30
  31 /**
  32  * Class representing a MediaWiki article and history.
  33  *
  34  * Some fields are public only for backwards-compatibility. Use accessors.
  35  * In the past, this class was part of Article.php and everything was public.
  36  */
  37 class WikiPage implements Page, IDBAccessObject {
  38         // Constants for $mDataLoadedFrom and related
  39
  40         /**
  41          * @var Title
  42          */
  43         public $mTitle = null;
  44
  45         /**@{{
  46          * @protected
  47          */
  48         public $mDataLoaded = false;         // !< Boolean
  49         public $mIsRedirect = false;         // !< Boolean
  50         public $mLatest = false;             // !< Integer (false means "not loaded")
  51         /**@}}*/
  52
  53         /** @var PreparedEdit Map of cache fields (text, parser output, ect) for a proposed/new edit */
  54         public $mPreparedEdit = false;
  55
  56         /**
  57          * @var int
  58          */
  59         protected $mId = null;
  60
  61         /**
  62          * @var int One of the READ_* constants
  63          */
  64         protected $mDataLoadedFrom = self::READ_NONE;
  65
  66         /**
  67          * @var Title
  68          */
  69         protected $mRedirectTarget = null;
  70
  71         /**
  72          * @var Revision
  73          */
  74         protected $mLastRevision = null;
  75
  76         /**
  77          * @var string Timestamp of the current revision or empty string if not loaded
  78          */
  79         protected $mTimestamp = '';
  80
  81         /**
  82          * @var string
  83          */
  84         protected $mTouched = '19700101000000';
  85
  86         /**
  87          * @var string
  88          */
  89         protected $mLinksUpdated = '19700101000000';
  90
  91         /** @deprecated since 1.29. Added in 1.28 for partial purging, no longer used. */
  92         const PURGE_CDN_CACHE = 1;
  93         const PURGE_CLUSTER_PCACHE = 2;
  94         const PURGE_GLOBAL_PCACHE = 4;
  95         const PURGE_ALL = 7;
  96
  97         /**
  98          * Constructor and clear the article
  99          * @param Title $title Reference to a Title object.
 100          */
 101         public function __construct( Title $title ) {
 102                 $this->mTitle = $title;
 103         }
 104
 105         /**
 106          * Makes sure that the mTitle object is cloned
 107          * to the newly cloned WikiPage.
 108          */
 109         public function __clone() {
 110                 $this->mTitle = clone $this->mTitle;
 111         }
 112
 113         /**
 114          * Create a WikiPage object of the appropriate class for the given title.
 115          *
 116          * @param Title $title
 117          *
 118          * @throws MWException
 119          * @return WikiPage|WikiCategoryPage|WikiFilePage
 120          */
 121         public static function factory( Title $title ) {
 122                 $ns = $title->getNamespace();
 123
 124                 if ( $ns == NS_MEDIA ) {
 125                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 126                 } elseif ( $ns < 0 ) {
 127                         throw new MWException( "Invalid or virtual namespace $ns given." );
 128                 }
 129
 130                 $page = null;
 131                 if ( !Hooks::run( 'WikiPageFactory', [ $title, &$page ] ) ) {
 132                         return $page;
 133                 }
 134
 135                 switch ( $ns ) {
 136                         case NS_FILE:
 137                                 $page = new WikiFilePage( $title );
 138                                 break;
 139                         case NS_CATEGORY:
 140                                 $page = new WikiCategoryPage( $title );
 141                                 break;
 142                         default:
 143                                 $page = new WikiPage( $title );
 144                 }
 145
 146                 return $page;
 147         }
 148
 149         /**
 150          * Constructor from a page id
 151          *
 152          * @param int $id Article ID to load
 153          * @param string|int $from One of the following values:
 154          *        - "fromdb" or WikiPage::READ_NORMAL to select from a replica DB
 155          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 156          *
 157          * @return WikiPage|null
 158          */
 159         public static function newFromID( $id, $from = 'fromdb' ) {
 160                 // page ids are never 0 or negative, see T63166
 161                 if ( $id < 1 ) {
 162                         return null;
 163                 }
 164
 165                 $from = self::convertSelectType( $from );
 166                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_REPLICA );
 167                 $row = $db->selectRow(
 168                         'page', self::selectFields(), [ 'page_id' => $id ], __METHOD__ );
 169                 if ( !$row ) {
 170                         return null;
 171                 }
 172                 return self::newFromRow( $row, $from );
 173         }
 174
 175         /**
 176          * Constructor from a database row
 177          *
 178          * @since 1.20
 179          * @param object $row Database row containing at least fields returned by selectFields().
 180          * @param string|int $from Source of $data:
 181          *        - "fromdb" or WikiPage::READ_NORMAL: from a replica DB
 182          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 183          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 184          * @return WikiPage
 185          */
 186         public static function newFromRow( $row, $from = 'fromdb' ) {
 187                 $page = self::factory( Title::newFromRow( $row ) );
 188                 $page->loadFromRow( $row, $from );
 189                 return $page;
 190         }
 191
 192         /**
 193          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 194          *
 195          * @param object|string|int $type
 196          * @return mixed
 197          */
 198         private static function convertSelectType( $type ) {
 199                 switch ( $type ) {
 200                 case 'fromdb':
 201                         return self::READ_NORMAL;
 202                 case 'fromdbmaster':
 203                         return self::READ_LATEST;
 204                 case 'forupdate':
 205                         return self::READ_LOCKING;
 206                 default:
 207                         // It may already be an integer or whatever else
 208                         return $type;
 209                 }
 210         }
 211
 212         /**
 213          * @todo Move this UI stuff somewhere else
 214          *
 215          * @see ContentHandler::getActionOverrides
 216          * @return array
 217          */
 218         public function getActionOverrides() {
 219                 return $this->getContentHandler()->getActionOverrides();
 220         }
 221
 222         /**
 223          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 224          *
 225          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 226          *
 227          * @return ContentHandler
 228          *
 229          * @since 1.21
 230          */
 231         public function getContentHandler() {
 232                 return ContentHandler::getForModelID( $this->getContentModel() );
 233         }
 234
 235         /**
 236          * Get the title object of the article
 237          * @return Title Title object of this page
 238          */
 239         public function getTitle() {
 240                 return $this->mTitle;
 241         }
 242
 243         /**
 244          * Clear the object
 245          * @return void
 246          */
 247         public function clear() {
 248                 $this->mDataLoaded = false;
 249                 $this->mDataLoadedFrom = self::READ_NONE;
 250
 251                 $this->clearCacheFields();
 252         }
 253
 254         /**
 255          * Clear the object cache fields
 256          * @return void
 257          */
 258         protected function clearCacheFields() {
 259                 $this->mId = null;
 260                 $this->mRedirectTarget = null; // Title object if set
 261                 $this->mLastRevision = null; // Latest revision
 262                 $this->mTouched = '19700101000000';
 263                 $this->mLinksUpdated = '19700101000000';
 264                 $this->mTimestamp = '';
 265                 $this->mIsRedirect = false;
 266                 $this->mLatest = false;
 267                 // T59026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 268                 // the requested rev ID and content against the cached one for equality. For most
 269                 // content types, the output should not change during the lifetime of this cache.
 270                 // Clearing it can cause extra parses on edit for no reason.
 271         }
 272
 273         /**
 274          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 275          * @return void
 276          * @since 1.23
 277          */
 278         public function clearPreparedEdit() {
 279                 $this->mPreparedEdit = false;
 280         }
 281
 282         /**
 283          * Return the list of revision fields that should be selected to create
 284          * a new page.
 285          *
 286          * @return array
 287          */
 288         public static function selectFields() {
 289                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 290
 291                 $fields = [
 292                         'page_id',
 293                         'page_namespace',
 294                         'page_title',
 295                         'page_restrictions',
 296                         'page_is_redirect',
 297                         'page_is_new',
 298                         'page_random',
 299                         'page_touched',
 300                         'page_links_updated',
 301                         'page_latest',
 302                         'page_len',
 303                 ];
 304
 305                 if ( $wgContentHandlerUseDB ) {
 306                         $fields[] = 'page_content_model';
 307                 }
 308
 309                 if ( $wgPageLanguageUseDB ) {
 310                         $fields[] = 'page_lang';
 311                 }
 312
 313                 return $fields;
 314         }
 315
 316         /**
 317          * Fetch a page record with the given conditions
 318          * @param IDatabase $dbr
 319          * @param array $conditions
 320          * @param array $options
 321          * @return object|bool Database result resource, or false on failure
 322          */
 323         protected function pageData( $dbr, $conditions, $options = [] ) {
 324                 $fields = self::selectFields();
 325
 326                 // Avoid PHP 7.1 warning of passing $this by reference
 327                 $wikiPage = $this;
 328
 329                 Hooks::run( 'ArticlePageDataBefore', [ &$wikiPage, &$fields ] );
 330
 331                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 332
 333                 Hooks::run( 'ArticlePageDataAfter', [ &$wikiPage, &$row ] );
 334
 335                 return $row;
 336         }
 337
 338         /**
 339          * Fetch a page record matching the Title object's namespace and title
 340          * using a sanitized title string
 341          *
 342          * @param IDatabase $dbr
 343          * @param Title $title
 344          * @param array $options
 345          * @return object|bool Database result resource, or false on failure
 346          */
 347         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
 348                 return $this->pageData( $dbr, [
 349                         'page_namespace' => $title->getNamespace(),
 350                         'page_title' => $title->getDBkey() ], $options );
 351         }
 352
 353         /**
 354          * Fetch a page record matching the requested ID
 355          *
 356          * @param IDatabase $dbr
 357          * @param int $id
 358          * @param array $options
 359          * @return object|bool Database result resource, or false on failure
 360          */
 361         public function pageDataFromId( $dbr, $id, $options = [] ) {
 362                 return $this->pageData( $dbr, [ 'page_id' => $id ], $options );
 363         }
 364
 365         /**
 366          * Load the object from a given source by title
 367          *
 368          * @param object|string|int $from One of the following:
 369          *   - A DB query result object.
 370          *   - "fromdb" or WikiPage::READ_NORMAL to get from a replica DB.
 371          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 372          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 373          *     using SELECT FOR UPDATE.
 374          *
 375          * @return void
 376          */
 377         public function loadPageData( $from = 'fromdb' ) {
 378                 $from = self::convertSelectType( $from );
 379                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 380                         // We already have the data from the correct location, no need to load it twice.
 381                         return;
 382                 }
 383
 384                 if ( is_int( $from ) ) {
 385                         list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 386                         $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 387                         $loadBalancer = MediaWikiServices::getInstance()->getDBLoadBalancer();
 388
 389                         if ( !$data
 390                                 && $index == DB_REPLICA
 391                                 && $loadBalancer->getServerCount() > 1
 392                                 && $loadBalancer->hasOrMadeRecentMasterChanges()
 393                         ) {
 394                                 $from = self::READ_LATEST;
 395                                 list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 396                                 $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 397                         }
 398                 } else {
 399                         // No idea from where the caller got this data, assume replica DB.
 400                         $data = $from;
 401                         $from = self::READ_NORMAL;
 402                 }
 403
 404                 $this->loadFromRow( $data, $from );
 405         }
 406
 407         /**
 408          * Load the object from a database row
 409          *
 410          * @since 1.20
 411          * @param object|bool $data DB row containing fields returned by selectFields() or false
 412          * @param string|int $from One of the following:
 413          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a replica DB
 414          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 415          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 416          *          the master DB using SELECT FOR UPDATE
 417          */
 418         public function loadFromRow( $data, $from ) {
 419                 $lc = LinkCache::singleton();
 420                 $lc->clearLink( $this->mTitle );
 421
 422                 if ( $data ) {
 423                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 424
 425                         $this->mTitle->loadFromRow( $data );
 426
 427                         // Old-fashioned restrictions
 428                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 429
 430                         $this->mId = intval( $data->page_id );
 431                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 432                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 433                         $this->mIsRedirect = intval( $data->page_is_redirect );
 434                         $this->mLatest = intval( $data->page_latest );
 435                         // T39225: $latest may no longer match the cached latest Revision object.
 436                         // Double-check the ID of any cached latest Revision object for consistency.
 437                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 438                                 $this->mLastRevision = null;
 439                                 $this->mTimestamp = '';
 440                         }
 441                 } else {
 442                         $lc->addBadLinkObj( $this->mTitle );
 443
 444                         $this->mTitle->loadFromRow( false );
 445
 446                         $this->clearCacheFields();
 447
 448                         $this->mId = 0;
 449                 }
 450
 451                 $this->mDataLoaded = true;
 452                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 453         }
 454
 455         /**
 456          * @return int Page ID
 457          */
 458         public function getId() {
 459                 if ( !$this->mDataLoaded ) {
 460                         $this->loadPageData();
 461                 }
 462                 return $this->mId;
 463         }
 464
 465         /**
 466          * @return bool Whether or not the page exists in the database
 467          */
 468         public function exists() {
 469                 if ( !$this->mDataLoaded ) {
 470                         $this->loadPageData();
 471                 }
 472                 return $this->mId > 0;
 473         }
 474
 475         /**
 476          * Check if this page is something we're going to be showing
 477          * some sort of sensible content for. If we return false, page
 478          * views (plain action=view) will return an HTTP 404 response,
 479          * so spiders and robots can know they're following a bad link.
 480          *
 481          * @return bool
 482          */
 483         public function hasViewableContent() {
 484                 return $this->mTitle->isKnown();
 485         }
 486
 487         /**
 488          * Tests if the article content represents a redirect
 489          *
 490          * @return bool
 491          */
 492         public function isRedirect() {
 493                 if ( !$this->mDataLoaded ) {
 494                         $this->loadPageData();
 495                 }
 496
 497                 return (bool)$this->mIsRedirect;
 498         }
 499
 500         /**
 501          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 502          *
 503          * Will use the revisions actual content model if the page exists,
 504          * and the page's default if the page doesn't exist yet.
 505          *
 506          * @return string
 507          *
 508          * @since 1.21
 509          */
 510         public function getContentModel() {
 511                 if ( $this->exists() ) {
 512                         $cache = ObjectCache::getMainWANInstance();
 513
 514                         return $cache->getWithSetCallback(
 515                                 $cache->makeKey( 'page', 'content-model', $this->getLatest() ),
 516                                 $cache::TTL_MONTH,
 517                                 function () {
 518                                         $rev = $this->getRevision();
 519                                         if ( $rev ) {
 520                                                 // Look at the revision's actual content model
 521                                                 return $rev->getContentModel();
 522                                         } else {
 523                                                 $title = $this->mTitle->getPrefixedDBkey();
 524                                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 525                                                 return $this->mTitle->getContentModel();
 526                                         }
 527                                 }
 528                         );
 529                 }
 530
 531                 // use the default model for this page
 532                 return $this->mTitle->getContentModel();
 533         }
 534
 535         /**
 536          * Loads page_touched and returns a value indicating if it should be used
 537          * @return bool True if this page exists and is not a redirect
 538          */
 539         public function checkTouched() {
 540                 if ( !$this->mDataLoaded ) {
 541                         $this->loadPageData();
 542                 }
 543                 return ( $this->mId && !$this->mIsRedirect );
 544         }
 545
 546         /**
 547          * Get the page_touched field
 548          * @return string Containing GMT timestamp
 549          */
 550         public function getTouched() {
 551                 if ( !$this->mDataLoaded ) {
 552                         $this->loadPageData();
 553                 }
 554                 return $this->mTouched;
 555         }
 556
 557         /**
 558          * Get the page_links_updated field
 559          * @return string|null Containing GMT timestamp
 560          */
 561         public function getLinksTimestamp() {
 562                 if ( !$this->mDataLoaded ) {
 563                         $this->loadPageData();
 564                 }
 565                 return $this->mLinksUpdated;
 566         }
 567
 568         /**
 569          * Get the page_latest field
 570          * @return int The rev_id of current revision
 571          */
 572         public function getLatest() {
 573                 if ( !$this->mDataLoaded ) {
 574                         $this->loadPageData();
 575                 }
 576                 return (int)$this->mLatest;
 577         }
 578
 579         /**
 580          * Get the Revision object of the oldest revision
 581          * @return Revision|null
 582          */
 583         public function getOldestRevision() {
 584                 // Try using the replica DB first, then try the master
 585                 $rev = $this->mTitle->getFirstRevision();
 586                 if ( !$rev ) {
 587                         $rev = $this->mTitle->getFirstRevision( Title::GAID_FOR_UPDATE );
 588                 }
 589                 return $rev;
 590         }
 591
 592         /**
 593          * Loads everything except the text
 594          * This isn't necessary for all uses, so it's only done if needed.
 595          */
 596         protected function loadLastEdit() {
 597                 if ( $this->mLastRevision !== null ) {
 598                         return; // already loaded
 599                 }
 600
 601                 $latest = $this->getLatest();
 602                 if ( !$latest ) {
 603                         return; // page doesn't exist or is missing page_latest info
 604                 }
 605
 606                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 607                         // T39225: if session S1 loads the page row FOR UPDATE, the result always
 608                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 609                         // transactions, where S1 normally only sees changes committed before the first S1
 610                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 611                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 612                         // happened after the first S1 SELECT.
 613                         // https://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
 614                         $flags = Revision::READ_LOCKING;
 615                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 616                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 617                         // Bug T93976: if page_latest was loaded from the master, fetch the
 618                         // revision from there as well, as it may not exist yet on a replica DB.
 619                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 620                         $flags = Revision::READ_LATEST;
 621                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 622                 } else {
 623                         $dbr = wfGetDB( DB_REPLICA );
 624                         $revision = Revision::newKnownCurrent( $dbr, $this->getId(), $latest );
 625                 }
 626
 627                 if ( $revision ) { // sanity
 628                         $this->setLastEdit( $revision );
 629                 }
 630         }
 631
 632         /**
 633          * Set the latest revision
 634          * @param Revision $revision
 635          */
 636         protected function setLastEdit( Revision $revision ) {
 637                 $this->mLastRevision = $revision;
 638                 $this->mTimestamp = $revision->getTimestamp();
 639         }
 640
 641         /**
 642          * Get the latest revision
 643          * @return Revision|null
 644          */
 645         public function getRevision() {
 646                 $this->loadLastEdit();
 647                 if ( $this->mLastRevision ) {
 648                         return $this->mLastRevision;
 649                 }
 650                 return null;
 651         }
 652
 653         /**
 654          * Get the content of the current revision. No side-effects...
 655          *
 656          * @param int $audience One of:
 657          *   Revision::FOR_PUBLIC       to be displayed to all users
 658          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 659          *   Revision::RAW              get the text regardless of permissions
 660          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 661          *   to the $audience parameter
 662          * @return Content|null The content of the current revision
 663          *
 664          * @since 1.21
 665          */
 666         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 667                 $this->loadLastEdit();
 668                 if ( $this->mLastRevision ) {
 669                         return $this->mLastRevision->getContent( $audience, $user );
 670                 }
 671                 return null;
 672         }
 673
 674         /**
 675          * @return string MW timestamp of last article revision
 676          */
 677         public function getTimestamp() {
 678                 // Check if the field has been filled by WikiPage::setTimestamp()
 679                 if ( !$this->mTimestamp ) {
 680                         $this->loadLastEdit();
 681                 }
 682
 683                 return wfTimestamp( TS_MW, $this->mTimestamp );
 684         }
 685
 686         /**
 687          * Set the page timestamp (use only to avoid DB queries)
 688          * @param string $ts MW timestamp of last article revision
 689          * @return void
 690          */
 691         public function setTimestamp( $ts ) {
 692                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 693         }
 694
 695         /**
 696          * @param int $audience One of:
 697          *   Revision::FOR_PUBLIC       to be displayed to all users
 698          *   Revision::FOR_THIS_USER    to be displayed to the given user
 699          *   Revision::RAW              get the text regardless of permissions
 700          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 701          *   to the $audience parameter
 702          * @return int User ID for the user that made the last article revision
 703          */
 704         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 705                 $this->loadLastEdit();
 706                 if ( $this->mLastRevision ) {
 707                         return $this->mLastRevision->getUser( $audience, $user );
 708                 } else {
 709                         return -1;
 710                 }
 711         }
 712
 713         /**
 714          * Get the User object of the user who created the page
 715          * @param int $audience One of:
 716          *   Revision::FOR_PUBLIC       to be displayed to all users
 717          *   Revision::FOR_THIS_USER    to be displayed to the given user
 718          *   Revision::RAW              get the text regardless of permissions
 719          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 720          *   to the $audience parameter
 721          * @return User|null
 722          */
 723         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 724                 $revision = $this->getOldestRevision();
 725                 if ( $revision ) {
 726                         $userName = $revision->getUserText( $audience, $user );
 727                         return User::newFromName( $userName, false );
 728                 } else {
 729                         return null;
 730                 }
 731         }
 732
 733         /**
 734          * @param int $audience One of:
 735          *   Revision::FOR_PUBLIC       to be displayed to all users
 736          *   Revision::FOR_THIS_USER    to be displayed to the given user
 737          *   Revision::RAW              get the text regardless of permissions
 738          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 739          *   to the $audience parameter
 740          * @return string Username of the user that made the last article revision
 741          */
 742         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 743                 $this->loadLastEdit();
 744                 if ( $this->mLastRevision ) {
 745                         return $this->mLastRevision->getUserText( $audience, $user );
 746                 } else {
 747                         return '';
 748                 }
 749         }
 750
 751         /**
 752          * @param int $audience One of:
 753          *   Revision::FOR_PUBLIC       to be displayed to all users
 754          *   Revision::FOR_THIS_USER    to be displayed to the given user
 755          *   Revision::RAW              get the text regardless of permissions
 756          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 757          *   to the $audience parameter
 758          * @return string Comment stored for the last article revision
 759          */
 760         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 761                 $this->loadLastEdit();
 762                 if ( $this->mLastRevision ) {
 763                         return $this->mLastRevision->getComment( $audience, $user );
 764                 } else {
 765                         return '';
 766                 }
 767         }
 768
 769         /**
 770          * Returns true if last revision was marked as "minor edit"
 771          *
 772          * @return bool Minor edit indicator for the last article revision.
 773          */
 774         public function getMinorEdit() {
 775                 $this->loadLastEdit();
 776                 if ( $this->mLastRevision ) {
 777                         return $this->mLastRevision->isMinor();
 778                 } else {
 779                         return false;
 780                 }
 781         }
 782
 783         /**
 784          * Determine whether a page would be suitable for being counted as an
 785          * article in the site_stats table based on the title & its content
 786          *
 787          * @param PreparedEdit|bool $editInfo (false): object returned by prepareTextForEdit(),
 788          *   if false, the current database state will be used
 789          * @return bool
 790          */
 791         public function isCountable( $editInfo = false ) {
 792                 global $wgArticleCountMethod;
 793
 794                 if ( !$this->mTitle->isContentPage() ) {
 795                         return false;
 796                 }
 797
 798                 if ( $editInfo ) {
 799                         $content = $editInfo->pstContent;
 800                 } else {
 801                         $content = $this->getContent();
 802                 }
 803
 804                 if ( !$content || $content->isRedirect() ) {
 805                         return false;
 806                 }
 807
 808                 $hasLinks = null;
 809
 810                 if ( $wgArticleCountMethod === 'link' ) {
 811                         // nasty special case to avoid re-parsing to detect links
 812
 813                         if ( $editInfo ) {
 814                                 // ParserOutput::getLinks() is a 2D array of page links, so
 815                                 // to be really correct we would need to recurse in the array
 816                                 // but the main array should only have items in it if there are
 817                                 // links.
 818                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 819                         } else {
 820                                 $hasLinks = (bool)wfGetDB( DB_REPLICA )->selectField( 'pagelinks', 1,
 821                                         [ 'pl_from' => $this->getId() ], __METHOD__ );
 822                         }
 823                 }
 824
 825                 return $content->isCountable( $hasLinks );
 826         }
 827
 828         /**
 829          * If this page is a redirect, get its target
 830          *
 831          * The target will be fetched from the redirect table if possible.
 832          * If this page doesn't have an entry there, call insertRedirect()
 833          * @return Title|null Title object, or null if this page is not a redirect
 834          */
 835         public function getRedirectTarget() {
 836                 if ( !$this->mTitle->isRedirect() ) {
 837                         return null;
 838                 }
 839
 840                 if ( $this->mRedirectTarget !== null ) {
 841                         return $this->mRedirectTarget;
 842                 }
 843
 844                 // Query the redirect table
 845                 $dbr = wfGetDB( DB_REPLICA );
 846                 $row = $dbr->selectRow( 'redirect',
 847                         [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ],
 848                         [ 'rd_from' => $this->getId() ],
 849                         __METHOD__
 850                 );
 851
 852                 // rd_fragment and rd_interwiki were added later, populate them if empty
 853                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 854                         $this->mRedirectTarget = Title::makeTitle(
 855                                 $row->rd_namespace, $row->rd_title,
 856                                 $row->rd_fragment, $row->rd_interwiki
 857                         );
 858                         return $this->mRedirectTarget;
 859                 }
 860
 861                 // This page doesn't have an entry in the redirect table
 862                 $this->mRedirectTarget = $this->insertRedirect();
 863                 return $this->mRedirectTarget;
 864         }
 865
 866         /**
 867          * Insert an entry for this page into the redirect table if the content is a redirect
 868          *
 869          * The database update will be deferred via DeferredUpdates
 870          *
 871          * Don't call this function directly unless you know what you're doing.
 872          * @return Title|null Title object or null if not a redirect
 873          */
 874         public function insertRedirect() {
 875                 $content = $this->getContent();
 876                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 877                 if ( !$retval ) {
 878                         return null;
 879                 }
 880
 881                 // Update the DB post-send if the page has not cached since now
 882                 $latest = $this->getLatest();
 883                 DeferredUpdates::addCallableUpdate(
 884                         function () use ( $retval, $latest ) {
 885                                 $this->insertRedirectEntry( $retval, $latest );
 886                         },
 887                         DeferredUpdates::POSTSEND,
 888                         wfGetDB( DB_MASTER )
 889                 );
 890
 891                 return $retval;
 892         }
 893
 894         /**
 895          * Insert or update the redirect table entry for this page to indicate it redirects to $rt
 896          * @param Title $rt Redirect target
 897          * @param int|null $oldLatest Prior page_latest for check and set
 898          */
 899         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
 900                 $dbw = wfGetDB( DB_MASTER );
 901                 $dbw->startAtomic( __METHOD__ );
 902
 903                 if ( !$oldLatest || $oldLatest == $this->lockAndGetLatest() ) {
 904                         $dbw->upsert(
 905                                 'redirect',
 906                                 [
 907                                         'rd_from' => $this->getId(),
 908                                         'rd_namespace' => $rt->getNamespace(),
 909                                         'rd_title' => $rt->getDBkey(),
 910                                         'rd_fragment' => $rt->getFragment(),
 911                                         'rd_interwiki' => $rt->getInterwiki(),
 912                                 ],
 913                                 [ 'rd_from' ],
 914                                 [
 915                                         'rd_namespace' => $rt->getNamespace(),
 916                                         'rd_title' => $rt->getDBkey(),
 917                                         'rd_fragment' => $rt->getFragment(),
 918                                         'rd_interwiki' => $rt->getInterwiki(),
 919                                 ],
 920                                 __METHOD__
 921                         );
 922                 }
 923
 924                 $dbw->endAtomic( __METHOD__ );
 925         }
 926
 927         /**
 928          * Get the Title object or URL this page redirects to
 929          *
 930          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 931          */
 932         public function followRedirect() {
 933                 return $this->getRedirectURL( $this->getRedirectTarget() );
 934         }
 935
 936         /**
 937          * Get the Title object or URL to use for a redirect. We use Title
 938          * objects for same-wiki, non-special redirects and URLs for everything
 939          * else.
 940          * @param Title $rt Redirect target
 941          * @return bool|Title|string False, Title object of local target, or string with URL
 942          */
 943         public function getRedirectURL( $rt ) {
 944                 if ( !$rt ) {
 945                         return false;
 946                 }
 947
 948                 if ( $rt->isExternal() ) {
 949                         if ( $rt->isLocal() ) {
 950                                 // Offsite wikis need an HTTP redirect.
 951                                 // This can be hard to reverse and may produce loops,
 952                                 // so they may be disabled in the site configuration.
 953                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 954                                 return $rt->getFullURL( [ 'rdfrom' => $source ] );
 955                         } else {
 956                                 // External pages without "local" bit set are not valid
 957                                 // redirect targets
 958                                 return false;
 959                         }
 960                 }
 961
 962                 if ( $rt->isSpecialPage() ) {
 963                         // Gotta handle redirects to special pages differently:
 964                         // Fill the HTTP response "Location" header and ignore the rest of the page we're on.
 965                         // Some pages are not valid targets.
 966                         if ( $rt->isValidRedirectTarget() ) {
 967                                 return $rt->getFullURL();
 968                         } else {
 969                                 return false;
 970                         }
 971                 }
 972
 973                 return $rt;
 974         }
 975
 976         /**
 977          * Get a list of users who have edited this article, not including the user who made
 978          * the most recent revision, which you can get from $article->getUser() if you want it
 979          * @return UserArrayFromResult
 980          */
 981         public function getContributors() {
 982                 // @todo FIXME: This is expensive; cache this info somewhere.
 983
 984                 $dbr = wfGetDB( DB_REPLICA );
 985
 986                 if ( $dbr->implicitGroupby() ) {
 987                         $realNameField = 'user_real_name';
 988                 } else {
 989                         $realNameField = 'MIN(user_real_name) AS user_real_name';
 990                 }
 991
 992                 $tables = [ 'revision', 'user' ];
 993
 994                 $fields = [
 995                         'user_id' => 'rev_user',
 996                         'user_name' => 'rev_user_text',
 997                         $realNameField,
 998                         'timestamp' => 'MAX(rev_timestamp)',
 999                 ];
1000
1001                 $conds = [ 'rev_page' => $this->getId() ];
1002
1003                 // The user who made the top revision gets credited as "this page was last edited by
1004                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1005                 $user = $this->getUser();
1006                 if ( $user ) {
1007                         $conds[] = "rev_user != $user";
1008                 } else {
1009                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1010                 }
1011
1012                 // Username hidden?
1013                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0";
1014
1015                 $jconds = [
1016                         'user' => [ 'LEFT JOIN', 'rev_user = user_id' ],
1017                 ];
1018
1019                 $options = [
1020                         'GROUP BY' => [ 'rev_user', 'rev_user_text' ],
1021                         'ORDER BY' => 'timestamp DESC',
1022                 ];
1023
1024                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1025                 return new UserArrayFromResult( $res );
1026         }
1027
1028         /**
1029          * Should the parser cache be used?
1030          *
1031          * @param ParserOptions $parserOptions ParserOptions to check
1032          * @param int $oldId
1033          * @return bool
1034          */
1035         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
1036                 return $parserOptions->getStubThreshold() == 0
1037                         && $this->exists()
1038                         && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
1039                         && $this->getContentHandler()->isParserCacheSupported();
1040         }
1041
1042         /**
1043          * Get a ParserOutput for the given ParserOptions and revision ID.
1044          *
1045          * The parser cache will be used if possible. Cache misses that result
1046          * in parser runs are debounced with PoolCounter.
1047          *
1048          * @since 1.19
1049          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1050          * @param null|int $oldid Revision ID to get the text from, passing null or 0 will
1051          *   get the current revision (default value)
1052          * @param bool $forceParse Force reindexing, regardless of cache settings
1053          * @return bool|ParserOutput ParserOutput or false if the revision was not found
1054          */
1055         public function getParserOutput(
1056                 ParserOptions $parserOptions, $oldid = null, $forceParse = false
1057         ) {
1058                 $useParserCache =
1059                         ( !$forceParse ) && $this->shouldCheckParserCache( $parserOptions, $oldid );
1060
1061                 if ( $useParserCache && !$parserOptions->isSafeToCache() ) {
1062                         throw new InvalidArgumentException(
1063                                 'The supplied ParserOptions are not safe to cache. Fix the options or set $forceParse = true.'
1064                         );
1065                 }
1066
1067                 wfDebug( __METHOD__ .
1068                         ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1069                 if ( $parserOptions->getStubThreshold() ) {
1070                         wfIncrStats( 'pcache.miss.stub' );
1071                 }
1072
1073                 if ( $useParserCache ) {
1074                         $parserOutput = MediaWikiServices::getInstance()->getParserCache()
1075                                 ->get( $this, $parserOptions );
1076                         if ( $parserOutput !== false ) {
1077                                 return $parserOutput;
1078                         }
1079                 }
1080
1081                 if ( $oldid === null || $oldid === 0 ) {
1082                         $oldid = $this->getLatest();
1083                 }
1084
1085                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1086                 $pool->execute();
1087
1088                 return $pool->getParserOutput();
1089         }
1090
1091         /**
1092          * Do standard deferred updates after page view (existing or missing page)
1093          * @param User $user The relevant user
1094          * @param int $oldid Revision id being viewed; if not given or 0, latest revision is assumed
1095          */
1096         public function doViewUpdates( User $user, $oldid = 0 ) {
1097                 if ( wfReadOnly() ) {
1098                         return;
1099                 }
1100
1101                 Hooks::run( 'PageViewUpdates', [ $this, $user ] );
1102                 // Update newtalk / watchlist notification status
1103                 try {
1104                         $user->clearNotification( $this->mTitle, $oldid );
1105                 } catch ( DBError $e ) {
1106                         // Avoid outage if the master is not reachable
1107                         MWExceptionHandler::logException( $e );
1108                 }
1109         }
1110
1111         /**
1112          * Perform the actions of a page purging
1113          * @return bool
1114          * @note In 1.28 (and only 1.28), this took a $flags parameter that
1115          *  controlled how much purging was done.
1116          */
1117         public function doPurge() {
1118                 // Avoid PHP 7.1 warning of passing $this by reference
1119                 $wikiPage = $this;
1120
1121                 if ( !Hooks::run( 'ArticlePurge', [ &$wikiPage ] ) ) {
1122                         return false;
1123                 }
1124
1125                 $this->mTitle->invalidateCache();
1126
1127                 // Clear file cache
1128                 HTMLFileCache::clearFileCache( $this->getTitle() );
1129                 // Send purge after above page_touched update was committed
1130                 DeferredUpdates::addUpdate(
1131                         new CdnCacheUpdate( $this->mTitle->getCdnUrls() ),
1132                         DeferredUpdates::PRESEND
1133                 );
1134
1135                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1136                         $messageCache = MessageCache::singleton();
1137                         $messageCache->updateMessageOverride( $this->mTitle, $this->getContent() );
1138                 }
1139
1140                 return true;
1141         }
1142
1143         /**
1144          * Get the last time a user explicitly purged the page via action=purge
1145          *
1146          * @return string|bool TS_MW timestamp or false
1147          * @since 1.28
1148          * @deprecated since 1.29. It will always return false.
1149          */
1150         public function getLastPurgeTimestamp() {
1151                 wfDeprecated( __METHOD__, '1.29' );
1152                 return false;
1153         }
1154
1155         /**
1156          * Insert a new empty page record for this article.
1157          * This *must* be followed up by creating a revision
1158          * and running $this->updateRevisionOn( ... );
1159          * or else the record will be left in a funky state.
1160          * Best if all done inside a transaction.
1161          *
1162          * @param IDatabase $dbw
1163          * @param int|null $pageId Custom page ID that will be used for the insert statement
1164          *
1165          * @return bool|int The newly created page_id key; false if the row was not
1166          *   inserted, e.g. because the title already existed or because the specified
1167          *   page ID is already in use.
1168          */
1169         public function insertOn( $dbw, $pageId = null ) {
1170                 $pageIdForInsert = $pageId ? [ 'page_id' => $pageId ] : [];
1171                 $dbw->insert(
1172                         'page',
1173                         [
1174                                 'page_namespace'    => $this->mTitle->getNamespace(),
1175                                 'page_title'        => $this->mTitle->getDBkey(),
1176                                 'page_restrictions' => '',
1177                                 'page_is_redirect'  => 0, // Will set this shortly...
1178                                 'page_is_new'       => 1,
1179                                 'page_random'       => wfRandom(),
1180                                 'page_touched'      => $dbw->timestamp(),
1181                                 'page_latest'       => 0, // Fill this in shortly...
1182                                 'page_len'          => 0, // Fill this in shortly...
1183                         ] + $pageIdForInsert,
1184                         __METHOD__,
1185                         'IGNORE'
1186                 );
1187
1188                 if ( $dbw->affectedRows() > 0 ) {
1189                         $newid = $pageId ? (int)$pageId : $dbw->insertId();
1190                         $this->mId = $newid;
1191                         $this->mTitle->resetArticleID( $newid );
1192
1193                         return $newid;
1194                 } else {
1195                         return false; // nothing changed
1196                 }
1197         }
1198
1199         /**
1200          * Update the page record to point to a newly saved revision.
1201          *
1202          * @param IDatabase $dbw
1203          * @param Revision $revision For ID number, and text used to set
1204          *   length and redirect status fields
1205          * @param int $lastRevision If given, will not overwrite the page field
1206          *   when different from the currently set value.
1207          *   Giving 0 indicates the new page flag should be set on.
1208          * @param bool $lastRevIsRedirect If given, will optimize adding and
1209          *   removing rows in redirect table.
1210          * @return bool Success; false if the page row was missing or page_latest changed
1211          */
1212         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1213                 $lastRevIsRedirect = null
1214         ) {
1215                 global $wgContentHandlerUseDB;
1216
1217                 // Assertion to try to catch T92046
1218                 if ( (int)$revision->getId() === 0 ) {
1219                         throw new InvalidArgumentException(
1220                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1221                         );
1222                 }
1223
1224                 $content = $revision->getContent();
1225                 $len = $content ? $content->getSize() : 0;
1226                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1227
1228                 $conditions = [ 'page_id' => $this->getId() ];
1229
1230                 if ( !is_null( $lastRevision ) ) {
1231                         // An extra check against threads stepping on each other
1232                         $conditions['page_latest'] = $lastRevision;
1233                 }
1234
1235                 $row = [ /* SET */
1236                         'page_latest'      => $revision->getId(),
1237                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1238                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1239                         'page_is_redirect' => $rt !== null ? 1 : 0,
1240                         'page_len'         => $len,
1241                 ];
1242
1243                 if ( $wgContentHandlerUseDB ) {
1244                         $row['page_content_model'] = $revision->getContentModel();
1245                 }
1246
1247                 $dbw->update( 'page',
1248                         $row,
1249                         $conditions,
1250                         __METHOD__ );
1251
1252                 $result = $dbw->affectedRows() > 0;
1253                 if ( $result ) {
1254                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1255                         $this->setLastEdit( $revision );
1256                         $this->mLatest = $revision->getId();
1257                         $this->mIsRedirect = (bool)$rt;
1258                         // Update the LinkCache.
1259                         LinkCache::singleton()->addGoodLinkObj(
1260                                 $this->getId(),
1261                                 $this->mTitle,
1262                                 $len,
1263                                 $this->mIsRedirect,
1264                                 $this->mLatest,
1265                                 $revision->getContentModel()
1266                         );
1267                 }
1268
1269                 return $result;
1270         }
1271
1272         /**
1273          * Add row to the redirect table if this is a redirect, remove otherwise.
1274          *
1275          * @param IDatabase $dbw
1276          * @param Title $redirectTitle Title object pointing to the redirect target,
1277          *   or NULL if this is not a redirect
1278          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1279          *   removing rows in redirect table.
1280          * @return bool True on success, false on failure
1281          * @private
1282          */
1283         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1284                 // Always update redirects (target link might have changed)
1285                 // Update/Insert if we don't know if the last revision was a redirect or not
1286                 // Delete if changing from redirect to non-redirect
1287                 $isRedirect = !is_null( $redirectTitle );
1288
1289                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1290                         return true;
1291                 }
1292
1293                 if ( $isRedirect ) {
1294                         $this->insertRedirectEntry( $redirectTitle );
1295                 } else {
1296                         // This is not a redirect, remove row from redirect table
1297                         $where = [ 'rd_from' => $this->getId() ];
1298                         $dbw->delete( 'redirect', $where, __METHOD__ );
1299                 }
1300
1301                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1302                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1303                 }
1304
1305                 return ( $dbw->affectedRows() != 0 );
1306         }
1307
1308         /**
1309          * If the given revision is newer than the currently set page_latest,
1310          * update the page record. Otherwise, do nothing.
1311          *
1312          * @deprecated since 1.24, use updateRevisionOn instead
1313          *
1314          * @param IDatabase $dbw
1315          * @param Revision $revision
1316          * @return bool
1317          */
1318         public function updateIfNewerOn( $dbw, $revision ) {
1319                 $row = $dbw->selectRow(
1320                         [ 'revision', 'page' ],
1321                         [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
1322                         [
1323                                 'page_id' => $this->getId(),
1324                                 'page_latest=rev_id' ],
1325                         __METHOD__ );
1326
1327                 if ( $row ) {
1328                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1329                                 return false;
1330                         }
1331                         $prev = $row->rev_id;
1332                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1333                 } else {
1334                         // No or missing previous revision; mark the page as new
1335                         $prev = 0;
1336                         $lastRevIsRedirect = null;
1337                 }
1338
1339                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1340
1341                 return $ret;
1342         }
1343
1344         /**
1345          * Get the content that needs to be saved in order to undo all revisions
1346          * between $undo and $undoafter. Revisions must belong to the same page,
1347          * must exist and must not be deleted
1348          * @param Revision $undo
1349          * @param Revision $undoafter Must be an earlier revision than $undo
1350          * @return Content|bool Content on success, false on failure
1351          * @since 1.21
1352          * Before we had the Content object, this was done in getUndoText
1353          */
1354         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1355                 $handler = $undo->getContentHandler();
1356                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1357         }
1358
1359         /**
1360          * Returns true if this page's content model supports sections.
1361          *
1362          * @return bool
1363          *
1364          * @todo The skin should check this and not offer section functionality if
1365          *   sections are not supported.
1366          * @todo The EditPage should check this and not offer section functionality
1367          *   if sections are not supported.
1368          */
1369         public function supportsSections() {
1370                 return $this->getContentHandler()->supportsSections();
1371         }
1372
1373         /**
1374          * @param string|int|null|bool $sectionId Section identifier as a number or string
1375          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1376          * or 'new' for a new section.
1377          * @param Content $sectionContent New content of the section.
1378          * @param string $sectionTitle New section's subject, only if $section is "new".
1379          * @param string $edittime Revision timestamp or null to use the current revision.
1380          *
1381          * @throws MWException
1382          * @return Content|null New complete article content, or null if error.
1383          *
1384          * @since 1.21
1385          * @deprecated since 1.24, use replaceSectionAtRev instead
1386          */
1387         public function replaceSectionContent(
1388                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
1389         ) {
1390                 $baseRevId = null;
1391                 if ( $edittime && $sectionId !== 'new' ) {
1392                         $dbr = wfGetDB( DB_REPLICA );
1393                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1394                         // Try the master if this thread may have just added it.
1395                         // This could be abstracted into a Revision method, but we don't want
1396                         // to encourage loading of revisions by timestamp.
1397                         if ( !$rev
1398                                 && wfGetLB()->getServerCount() > 1
1399                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1400                         ) {
1401                                 $dbw = wfGetDB( DB_MASTER );
1402                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1403                         }
1404                         if ( $rev ) {
1405                                 $baseRevId = $rev->getId();
1406                         }
1407                 }
1408
1409                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1410         }
1411
1412         /**
1413          * @param string|int|null|bool $sectionId Section identifier as a number or string
1414          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1415          * or 'new' for a new section.
1416          * @param Content $sectionContent New content of the section.
1417          * @param string $sectionTitle New section's subject, only if $section is "new".
1418          * @param int|null $baseRevId
1419          *
1420          * @throws MWException
1421          * @return Content|null New complete article content, or null if error.
1422          *
1423          * @since 1.24
1424          */
1425         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1426                 $sectionTitle = '', $baseRevId = null
1427         ) {
1428                 if ( strval( $sectionId ) === '' ) {
1429                         // Whole-page edit; let the whole text through
1430                         $newContent = $sectionContent;
1431                 } else {
1432                         if ( !$this->supportsSections() ) {
1433                                 throw new MWException( "sections not supported for content model " .
1434                                         $this->getContentHandler()->getModelID() );
1435                         }
1436
1437                         // T32711: always use current version when adding a new section
1438                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1439                                 $oldContent = $this->getContent();
1440                         } else {
1441                                 $rev = Revision::newFromId( $baseRevId );
1442                                 if ( !$rev ) {
1443                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1444                                                 $this->getId() . "; section: $sectionId)\n" );
1445                                         return null;
1446                                 }
1447
1448                                 $oldContent = $rev->getContent();
1449                         }
1450
1451                         if ( !$oldContent ) {
1452                                 wfDebug( __METHOD__ . ": no page text\n" );
1453                                 return null;
1454                         }
1455
1456                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1457                 }
1458
1459                 return $newContent;
1460         }
1461
1462         /**
1463          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1464          * @param int $flags
1465          * @return int Updated $flags
1466          */
1467         public function checkFlags( $flags ) {
1468                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1469                         if ( $this->exists() ) {
1470                                 $flags |= EDIT_UPDATE;
1471                         } else {
1472                                 $flags |= EDIT_NEW;
1473                         }
1474                 }
1475
1476                 return $flags;
1477         }
1478
1479         /**
1480          * Change an existing article or create a new article. Updates RC and all necessary caches,
1481          * optionally via the deferred update array.
1482          *
1483          * @param Content $content New content
1484          * @param string $summary Edit summary
1485          * @param int $flags Bitfield:
1486          *      EDIT_NEW
1487          *          Article is known or assumed to be non-existent, create a new one
1488          *      EDIT_UPDATE
1489          *          Article is known or assumed to be pre-existing, update it
1490          *      EDIT_MINOR
1491          *          Mark this edit minor, if the user is allowed to do so
1492          *      EDIT_SUPPRESS_RC
1493          *          Do not log the change in recentchanges
1494          *      EDIT_FORCE_BOT
1495          *          Mark the edit a "bot" edit regardless of user rights
1496          *      EDIT_AUTOSUMMARY
1497          *          Fill in blank summaries with generated text where possible
1498          *      EDIT_INTERNAL
1499          *          Signal that the page retrieve/save cycle happened entirely in this request.
1500          *
1501          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1502          * article will be detected. If EDIT_UPDATE is specified and the article
1503          * doesn't exist, the function will return an edit-gone-missing error. If
1504          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1505          * error will be returned. These two conditions are also possible with
1506          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1507          *
1508          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1509          *   This is not the parent revision ID, rather the revision ID for older
1510          *   content used as the source for a rollback, for example.
1511          * @param User $user The user doing the edit
1512          * @param string $serialFormat Format for storing the content in the
1513          *   database.
1514          * @param array|null $tags Change tags to apply to this edit
1515          * Callers are responsible for permission checks
1516          * (with ChangeTags::canAddTagsAccompanyingChange)
1517          * @param Int $undidRevId Id of revision that was undone or 0
1518          *
1519          * @throws MWException
1520          * @return Status Possible errors:
1521          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1522          *       set the fatal flag of $status.
1523          *     edit-gone-missing: In update mode, but the article didn't exist.
1524          *     edit-conflict: In update mode, the article changed unexpectedly.
1525          *     edit-no-change: Warning that the text was the same as before.
1526          *     edit-already-exists: In creation mode, but the article already exists.
1527          *
1528          *  Extensions may define additional errors.
1529          *
1530          *  $return->value will contain an associative array with members as follows:
1531          *     new: Boolean indicating if the function attempted to create a new article.
1532          *     revision: The revision object for the inserted revision, or null.
1533          *
1534          * @since 1.21
1535          * @throws MWException
1536          */
1537         public function doEditContent(
1538                 Content $content, $summary, $flags = 0, $baseRevId = false,
1539                 User $user = null, $serialFormat = null, $tags = [], $undidRevId = 0
1540         ) {
1541                 global $wgUser, $wgUseAutomaticEditSummaries;
1542
1543                 // Old default parameter for $tags was null
1544                 if ( $tags === null ) {
1545                         $tags = [];
1546                 }
1547
1548                 // Low-level sanity check
1549                 if ( $this->mTitle->getText() === '' ) {
1550                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1551                 }
1552                 // Make sure the given content type is allowed for this page
1553                 if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
1554                         return Status::newFatal( 'content-not-allowed-here',
1555                                 ContentHandler::getLocalizedName( $content->getModel() ),
1556                                 $this->mTitle->getPrefixedText()
1557                         );
1558                 }
1559
1560                 // Load the data from the master database if needed.
1561                 // The caller may already loaded it from the master or even loaded it using
1562                 // SELECT FOR UPDATE, so do not override that using clear().
1563                 $this->loadPageData( 'fromdbmaster' );
1564
1565                 $user = $user ?: $wgUser;
1566                 $flags = $this->checkFlags( $flags );
1567
1568                 // Avoid PHP 7.1 warning of passing $this by reference
1569                 $wikiPage = $this;
1570
1571                 // Trigger pre-save hook (using provided edit summary)
1572                 $hookStatus = Status::newGood( [] );
1573                 $hook_args = [ &$wikiPage, &$user, &$content, &$summary,
1574                                                         $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
1575                 // Check if the hook rejected the attempted save
1576                 if ( !Hooks::run( 'PageContentSave', $hook_args ) ) {
1577                         if ( $hookStatus->isOK() ) {
1578                                 // Hook returned false but didn't call fatal(); use generic message
1579                                 $hookStatus->fatal( 'edit-hook-aborted' );
1580                         }
1581
1582                         return $hookStatus;
1583                 }
1584
1585                 $old_revision = $this->getRevision(); // current revision
1586                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1587
1588                 if ( $old_content && $old_content->getModel() !== $content->getModel() ) {
1589                         $tags[] = 'mw-contentmodelchange';
1590                 }
1591
1592                 // Provide autosummaries if one is not provided and autosummaries are enabled
1593                 if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
1594                         $handler = $content->getContentHandler();
1595                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1596                 }
1597
1598                 // Avoid statsd noise and wasted cycles check the edit stash (T136678)
1599                 if ( ( $flags & EDIT_INTERNAL ) || ( $flags & EDIT_FORCE_BOT ) ) {
1600                         $useCache = false;
1601                 } else {
1602                         $useCache = true;
1603                 }
1604
1605                 // Get the pre-save transform content and final parser output
1606                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat, $useCache );
1607                 $pstContent = $editInfo->pstContent; // Content object
1608                 $meta = [
1609                         'bot' => ( $flags & EDIT_FORCE_BOT ),
1610                         'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
1611                         'serialized' => $pstContent->serialize( $serialFormat ),
1612                         'serialFormat' => $serialFormat,
1613                         'baseRevId' => $baseRevId,
1614                         'oldRevision' => $old_revision,
1615                         'oldContent' => $old_content,
1616                         'oldId' => $this->getLatest(),
1617                         'oldIsRedirect' => $this->isRedirect(),
1618                         'oldCountable' => $this->isCountable(),
1619                         'tags' => ( $tags !== null ) ? (array)$tags : [],
1620                         'undidRevId' => $undidRevId
1621                 ];
1622
1623                 // Actually create the revision and create/update the page
1624                 if ( $flags & EDIT_UPDATE ) {
1625                         $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
1626                 } else {
1627                         $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
1628                 }
1629
1630                 // Promote user to any groups they meet the criteria for
1631                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1632                         $user->addAutopromoteOnceGroups( 'onEdit' );
1633                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1634                 } );
1635
1636                 return $status;
1637         }
1638
1639         /**
1640          * @param Content $content Pre-save transform content
1641          * @param int $flags
1642          * @param User $user
1643          * @param string $summary
1644          * @param array $meta
1645          * @return Status
1646          * @throws DBUnexpectedError
1647          * @throws Exception
1648          * @throws FatalError
1649          * @throws MWException
1650          */
1651         private function doModify(
1652                 Content $content, $flags, User $user, $summary, array $meta
1653         ) {
1654                 global $wgUseRCPatrol;
1655
1656                 // Update article, but only if changed.
1657                 $status = Status::newGood( [ 'new' => false, 'revision' => null ] );
1658
1659                 // Convenience variables
1660                 $now = wfTimestampNow();
1661                 $oldid = $meta['oldId'];
1662                 /** @var Content|null $oldContent */
1663                 $oldContent = $meta['oldContent'];
1664                 $newsize = $content->getSize();
1665
1666                 if ( !$oldid ) {
1667                         // Article gone missing
1668                         $status->fatal( 'edit-gone-missing' );
1669
1670                         return $status;
1671                 } elseif ( !$oldContent ) {
1672                         // Sanity check for T39225
1673                         throw new MWException( "Could not find text for current revision {$oldid}." );
1674                 }
1675
1676                 // @TODO: pass content object?!
1677                 $revision = new Revision( [
1678                         'page'       => $this->getId(),
1679                         'title'      => $this->mTitle, // for determining the default content model
1680                         'comment'    => $summary,
1681                         'minor_edit' => $meta['minor'],
1682                         'text'       => $meta['serialized'],
1683                         'len'        => $newsize,
1684                         'parent_id'  => $oldid,
1685                         'user'       => $user->getId(),
1686                         'user_text'  => $user->getName(),
1687                         'timestamp'  => $now,
1688                         'content_model' => $content->getModel(),
1689                         'content_format' => $meta['serialFormat'],
1690                 ] );
1691
1692                 $changed = !$content->equals( $oldContent );
1693
1694                 $dbw = wfGetDB( DB_MASTER );
1695
1696                 if ( $changed ) {
1697                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1698                         $status->merge( $prepStatus );
1699                         if ( !$status->isOK() ) {
1700                                 return $status;
1701                         }
1702
1703                         $dbw->startAtomic( __METHOD__ );
1704                         // Get the latest page_latest value while locking it.
1705                         // Do a CAS style check to see if it's the same as when this method
1706                         // started. If it changed then bail out before touching the DB.
1707                         $latestNow = $this->lockAndGetLatest();
1708                         if ( $latestNow != $oldid ) {
1709                                 $dbw->endAtomic( __METHOD__ );
1710                                 // Page updated or deleted in the mean time
1711                                 $status->fatal( 'edit-conflict' );
1712
1713                                 return $status;
1714                         }
1715
1716                         // At this point we are now comitted to returning an OK
1717                         // status unless some DB query error or other exception comes up.
1718                         // This way callers don't have to call rollback() if $status is bad
1719                         // unless they actually try to catch exceptions (which is rare).
1720
1721                         // Save the revision text
1722                         $revisionId = $revision->insertOn( $dbw );
1723                         // Update page_latest and friends to reflect the new revision
1724                         if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
1725                                 throw new MWException( "Failed to update page row to use new revision." );
1726                         }
1727
1728                         Hooks::run( 'NewRevisionFromEditComplete',
1729                                 [ $this, $revision, $meta['baseRevId'], $user ] );
1730
1731                         // Update recentchanges
1732                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1733                                 // Mark as patrolled if the user can do so
1734                                 $patrolled = $wgUseRCPatrol && !count(
1735                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1736                                 // Add RC row to the DB
1737                                 RecentChange::notifyEdit(
1738                                         $now,
1739                                         $this->mTitle,
1740                                         $revision->isMinor(),
1741                                         $user,
1742                                         $summary,
1743                                         $oldid,
1744                                         $this->getTimestamp(),
1745                                         $meta['bot'],
1746                                         '',
1747                                         $oldContent ? $oldContent->getSize() : 0,
1748                                         $newsize,
1749                                         $revisionId,
1750                                         $patrolled,
1751                                         $meta['tags']
1752                                 );
1753                         }
1754
1755                         $user->incEditCount();
1756
1757                         $dbw->endAtomic( __METHOD__ );
1758                         $this->mTimestamp = $now;
1759                 } else {
1760                         // T34948: revision ID must be set to page {{REVISIONID}} and
1761                         // related variables correctly. Likewise for {{REVISIONUSER}} (T135261).
1762                         $revision->setId( $this->getLatest() );
1763                         $revision->setUserIdAndName(
1764                                 $this->getUser( Revision::RAW ),
1765                                 $this->getUserText( Revision::RAW )
1766                         );
1767                 }
1768
1769                 if ( $changed ) {
1770                         // Return the new revision to the caller
1771                         $status->value['revision'] = $revision;
1772                 } else {
1773                         $status->warning( 'edit-no-change' );
1774                         // Update page_touched as updateRevisionOn() was not called.
1775                         // Other cache updates are managed in onArticleEdit() via doEditUpdates().
1776                         $this->mTitle->invalidateCache( $now );
1777                 }
1778
1779                 // Do secondary updates once the main changes have been committed...
1780                 DeferredUpdates::addUpdate(
1781                         new AtomicSectionUpdate(
1782                                 $dbw,
1783                                 __METHOD__,
1784                                 function () use (
1785                                         $revision, &$user, $content, $summary, &$flags,
1786                                         $changed, $meta, &$status
1787                                 ) {
1788                                         // Update links tables, site stats, etc.
1789                                         $this->doEditUpdates(
1790                                                 $revision,
1791                                                 $user,
1792                                                 [
1793                                                         'changed' => $changed,
1794                                                         'oldcountable' => $meta['oldCountable'],
1795                                                         'oldrevision' => $meta['oldRevision']
1796                                                 ]
1797                                         );
1798                                         // Avoid PHP 7.1 warning of passing $this by reference
1799                                         $wikiPage = $this;
1800                                         // Trigger post-save hook
1801                                         $params = [ &$wikiPage, &$user, $content, $summary, $flags & EDIT_MINOR,
1802                                                 null, null, &$flags, $revision, &$status, $meta['baseRevId'],
1803                                                 $meta['undidRevId'] ];
1804                                         Hooks::run( 'PageContentSaveComplete', $params );
1805                                 }
1806                         ),
1807                         DeferredUpdates::PRESEND
1808                 );
1809
1810                 return $status;
1811         }
1812
1813         /**
1814          * @param Content $content Pre-save transform content
1815          * @param int $flags
1816          * @param User $user
1817          * @param string $summary
1818          * @param array $meta
1819          * @return Status
1820          * @throws DBUnexpectedError
1821          * @throws Exception
1822          * @throws FatalError
1823          * @throws MWException
1824          */
1825         private function doCreate(
1826                 Content $content, $flags, User $user, $summary, array $meta
1827         ) {
1828                 global $wgUseRCPatrol, $wgUseNPPatrol;
1829
1830                 $status = Status::newGood( [ 'new' => true, 'revision' => null ] );
1831
1832                 $now = wfTimestampNow();
1833                 $newsize = $content->getSize();
1834                 $prepStatus = $content->prepareSave( $this, $flags, $meta['oldId'], $user );
1835                 $status->merge( $prepStatus );
1836                 if ( !$status->isOK() ) {
1837                         return $status;
1838                 }
1839
1840                 $dbw = wfGetDB( DB_MASTER );
1841                 $dbw->startAtomic( __METHOD__ );
1842
1843                 // Add the page record unless one already exists for the title
1844                 $newid = $this->insertOn( $dbw );
1845                 if ( $newid === false ) {
1846                         $dbw->endAtomic( __METHOD__ ); // nothing inserted
1847                         $status->fatal( 'edit-already-exists' );
1848
1849                         return $status; // nothing done
1850                 }
1851
1852                 // At this point we are now comitted to returning an OK
1853                 // status unless some DB query error or other exception comes up.
1854                 // This way callers don't have to call rollback() if $status is bad
1855                 // unless they actually try to catch exceptions (which is rare).
1856
1857                 // @TODO: pass content object?!
1858                 $revision = new Revision( [
1859                         'page'       => $newid,
1860                         'title'      => $this->mTitle, // for determining the default content model
1861                         'comment'    => $summary,
1862                         'minor_edit' => $meta['minor'],
1863                         'text'       => $meta['serialized'],
1864                         'len'        => $newsize,
1865                         'user'       => $user->getId(),
1866                         'user_text'  => $user->getName(),
1867                         'timestamp'  => $now,
1868                         'content_model' => $content->getModel(),
1869                         'content_format' => $meta['serialFormat'],
1870                 ] );
1871
1872                 // Save the revision text...
1873                 $revisionId = $revision->insertOn( $dbw );
1874                 // Update the page record with revision data
1875                 if ( !$this->updateRevisionOn( $dbw, $revision, 0 ) ) {
1876                         throw new MWException( "Failed to update page row to use new revision." );
1877                 }
1878
1879                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
1880
1881                 // Update recentchanges
1882                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1883                         // Mark as patrolled if the user can do so
1884                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) &&
1885                                 !count( $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1886                         // Add RC row to the DB
1887                         RecentChange::notifyNew(
1888                                 $now,
1889                                 $this->mTitle,
1890                                 $revision->isMinor(),
1891                                 $user,
1892                                 $summary,
1893                                 $meta['bot'],
1894                                 '',
1895                                 $newsize,
1896                                 $revisionId,
1897                                 $patrolled,
1898                                 $meta['tags']
1899                         );
1900                 }
1901
1902                 $user->incEditCount();
1903
1904                 $dbw->endAtomic( __METHOD__ );
1905                 $this->mTimestamp = $now;
1906
1907                 // Return the new revision to the caller
1908                 $status->value['revision'] = $revision;
1909
1910                 // Do secondary updates once the main changes have been committed...
1911                 DeferredUpdates::addUpdate(
1912                         new AtomicSectionUpdate(
1913                                 $dbw,
1914                                 __METHOD__,
1915                                 function () use (
1916                                         $revision, &$user, $content, $summary, &$flags, $meta, &$status
1917                                 ) {
1918                                         // Update links, etc.
1919                                         $this->doEditUpdates( $revision, $user, [ 'created' => true ] );
1920                                         // Avoid PHP 7.1 warning of passing $this by reference
1921                                         $wikiPage = $this;
1922                                         // Trigger post-create hook
1923                                         $params = [ &$wikiPage, &$user, $content, $summary,
1924                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ];
1925                                         Hooks::run( 'PageContentInsertComplete', $params );
1926                                         // Trigger post-save hook
1927                                         $params = array_merge( $params, [ &$status, $meta['baseRevId'], 0 ] );
1928                                         Hooks::run( 'PageContentSaveComplete', $params );
1929                                 }
1930                         ),
1931                         DeferredUpdates::PRESEND
1932                 );
1933
1934                 return $status;
1935         }
1936
1937         /**
1938          * Get parser options suitable for rendering the primary article wikitext
1939          *
1940          * @see ContentHandler::makeParserOptions
1941          *
1942          * @param IContextSource|User|string $context One of the following:
1943          *        - IContextSource: Use the User and the Language of the provided
1944          *          context
1945          *        - User: Use the provided User object and $wgLang for the language,
1946          *          so use an IContextSource object if possible.
1947          *        - 'canonical': Canonical options (anonymous user with default
1948          *          preferences and content language).
1949          * @return ParserOptions
1950          */
1951         public function makeParserOptions( $context ) {
1952                 $options = $this->getContentHandler()->makeParserOptions( $context );
1953
1954                 if ( $this->getTitle()->isConversionTable() ) {
1955                         // @todo ConversionTable should become a separate content model, so
1956                         // we don't need special cases like this one.
1957                         $options->disableContentConversion();
1958                 }
1959
1960                 return $options;
1961         }
1962
1963         /**
1964          * Prepare content which is about to be saved.
1965          *
1966          * Prior to 1.30, this returned a stdClass object with the same class
1967          * members.
1968          *
1969          * @param Content $content
1970          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
1971          *        revision ID is also accepted, but this is deprecated.
1972          * @param User|null $user
1973          * @param string|null $serialFormat
1974          * @param bool $useCache Check shared prepared edit cache
1975          *
1976          * @return PreparedEdit
1977          *
1978          * @since 1.21
1979          */
1980         public function prepareContentForEdit(
1981                 Content $content, $revision = null, User $user = null,
1982                 $serialFormat = null, $useCache = true
1983         ) {
1984                 global $wgContLang, $wgUser, $wgAjaxEditStash;
1985
1986                 if ( is_object( $revision ) ) {
1987                         $revid = $revision->getId();
1988                 } else {
1989                         $revid = $revision;
1990                         // This code path is deprecated, and nothing is known to
1991                         // use it, so performance here shouldn't be a worry.
1992                         if ( $revid !== null ) {
1993                                 wfDeprecated( __METHOD__ . ' with $revision = revision ID', '1.25' );
1994                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
1995                         } else {
1996                                 $revision = null;
1997                         }
1998                 }
1999
2000                 $user = is_null( $user ) ? $wgUser : $user;
2001                 // XXX: check $user->getId() here???
2002
2003                 // Use a sane default for $serialFormat, see T59026
2004                 if ( $serialFormat === null ) {
2005                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2006                 }
2007
2008                 if ( $this->mPreparedEdit
2009                         && isset( $this->mPreparedEdit->newContent )
2010                         && $this->mPreparedEdit->newContent->equals( $content )
2011                         && $this->mPreparedEdit->revid == $revid
2012                         && $this->mPreparedEdit->format == $serialFormat
2013                         // XXX: also check $user here?
2014                 ) {
2015                         // Already prepared
2016                         return $this->mPreparedEdit;
2017                 }
2018
2019                 // The edit may have already been prepared via api.php?action=stashedit
2020                 $cachedEdit = $useCache && $wgAjaxEditStash
2021                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2022                         : false;
2023
2024                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2025                 Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );
2026
2027                 $edit = new PreparedEdit();
2028                 if ( $cachedEdit ) {
2029                         $edit->timestamp = $cachedEdit->timestamp;
2030                 } else {
2031                         $edit->timestamp = wfTimestampNow();
2032                 }
2033                 // @note: $cachedEdit is safely not used if the rev ID was referenced in the text
2034                 $edit->revid = $revid;
2035
2036                 if ( $cachedEdit ) {
2037                         $edit->pstContent = $cachedEdit->pstContent;
2038                 } else {
2039                         $edit->pstContent = $content
2040                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2041                                 : null;
2042                 }
2043
2044                 $edit->format = $serialFormat;
2045                 $edit->popts = $this->makeParserOptions( 'canonical' );
2046                 if ( $cachedEdit ) {
2047                         $edit->output = $cachedEdit->output;
2048                 } else {
2049                         if ( $revision ) {
2050                                 // We get here if vary-revision is set. This means that this page references
2051                                 // itself (such as via self-transclusion). In this case, we need to make sure
2052                                 // that any such self-references refer to the newly-saved revision, and not
2053                                 // to the previous one, which could otherwise happen due to replica DB lag.
2054                                 $oldCallback = $edit->popts->getCurrentRevisionCallback();
2055                                 $edit->popts->setCurrentRevisionCallback(
2056                                         function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
2057                                                 if ( $title->equals( $revision->getTitle() ) ) {
2058                                                         return $revision;
2059                                                 } else {
2060                                                         return call_user_func( $oldCallback, $title, $parser );
2061                                                 }
2062                                         }
2063                                 );
2064                         } else {
2065                                 // Try to avoid a second parse if {{REVISIONID}} is used
2066                                 $dbIndex = ( $this->mDataLoadedFrom & self::READ_LATEST ) === self::READ_LATEST
2067                                         ? DB_MASTER // use the best possible guess
2068                                         : DB_REPLICA; // T154554
2069
2070                                 $edit->popts->setSpeculativeRevIdCallback( function () use ( $dbIndex ) {
2071                                         return 1 + (int)wfGetDB( $dbIndex )->selectField(
2072                                                 'revision',
2073                                                 'MAX(rev_id)',
2074                                                 [],
2075                                                 __METHOD__
2076                                         );
2077                                 } );
2078                         }
2079                         $edit->output = $edit->pstContent
2080                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2081                                 : null;
2082                 }
2083
2084                 $edit->newContent = $content;
2085                 $edit->oldContent = $this->getContent( Revision::RAW );
2086
2087                 // NOTE: B/C for hooks! don't use these fields!
2088                 $edit->newText = $edit->newContent
2089                         ? ContentHandler::getContentText( $edit->newContent )
2090                         : '';
2091                 $edit->oldText = $edit->oldContent
2092                         ? ContentHandler::getContentText( $edit->oldContent )
2093                         : '';
2094                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2095
2096                 if ( $edit->output ) {
2097                         $edit->output->setCacheTime( wfTimestampNow() );
2098                 }
2099
2100                 // Process cache the result
2101                 $this->mPreparedEdit = $edit;
2102
2103                 return $edit;
2104         }
2105
2106         /**
2107          * Do standard deferred updates after page edit.
2108          * Update links tables, site stats, search index and message cache.
2109          * Purges pages that include this page if the text was changed here.
2110          * Every 100th edit, prune the recent changes table.
2111          *
2112          * @param Revision $revision
2113          * @param User $user User object that did the revision
2114          * @param array $options Array of options, following indexes are used:
2115          * - changed: bool, whether the revision changed the content (default true)
2116          * - created: bool, whether the revision created the page (default false)
2117          * - moved: bool, whether the page was moved (default false)
2118          * - restored: bool, whether the page was undeleted (default false)
2119          * - oldrevision: Revision object for the pre-update revision (default null)
2120          * - oldcountable: bool, null, or string 'no-change' (default null):
2121          *   - bool: whether the page was counted as an article before that
2122          *     revision, only used in changed is true and created is false
2123          *   - null: if created is false, don't update the article count; if created
2124          *     is true, do update the article count
2125          *   - 'no-change': don't update the article count, ever
2126          */
2127         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2128                 global $wgRCWatchCategoryMembership;
2129
2130                 $options += [
2131                         'changed' => true,
2132                         'created' => false,
2133                         'moved' => false,
2134                         'restored' => false,
2135                         'oldrevision' => null,
2136                         'oldcountable' => null
2137                 ];
2138                 $content = $revision->getContent();
2139
2140                 $logger = LoggerFactory::getInstance( 'SaveParse' );
2141
2142                 // See if the parser output before $revision was inserted is still valid
2143                 $editInfo = false;
2144                 if ( !$this->mPreparedEdit ) {
2145                         $logger->debug( __METHOD__ . ": No prepared edit...\n" );
2146                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2147                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision...\n" );
2148                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision-id' )
2149                         && $this->mPreparedEdit->output->getSpeculativeRevIdUsed() !== $revision->getId()
2150                 ) {
2151                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision-id with wrong ID...\n" );
2152                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-user' ) && !$options['changed'] ) {
2153                         $logger->info( __METHOD__ . ": Prepared edit has vary-user and is null...\n" );
2154                 } else {
2155                         wfDebug( __METHOD__ . ": Using prepared edit...\n" );
2156                         $editInfo = $this->mPreparedEdit;
2157                 }
2158
2159                 if ( !$editInfo ) {
2160                         // Parse the text again if needed. Be careful not to do pre-save transform twice:
2161                         // $text is usually already pre-save transformed once. Avoid using the edit stash
2162                         // as any prepared content from there or in doEditContent() was already rejected.
2163                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user, null, false );
2164                 }
2165
2166                 // Save it to the parser cache.
2167                 // Make sure the cache time matches page_touched to avoid double parsing.
2168                 MediaWikiServices::getInstance()->getParserCache()->save(
2169                         $editInfo->output, $this, $editInfo->popts,
2170                         $revision->getTimestamp(), $editInfo->revid
2171                 );
2172
2173                 // Update the links tables and other secondary data
2174                 if ( $content ) {
2175                         $recursive = $options['changed']; // T52785
2176                         $updates = $content->getSecondaryDataUpdates(
2177                                 $this->getTitle(), null, $recursive, $editInfo->output
2178                         );
2179                         foreach ( $updates as $update ) {
2180                                 if ( $update instanceof LinksUpdate ) {
2181                                         $update->setRevision( $revision );
2182                                         $update->setTriggeringUser( $user );
2183                                 }
2184                                 DeferredUpdates::addUpdate( $update );
2185                         }
2186                         if ( $wgRCWatchCategoryMembership
2187                                 && $this->getContentHandler()->supportsCategories() === true
2188                                 && ( $options['changed'] || $options['created'] )
2189                                 && !$options['restored']
2190                         ) {
2191                                 // Note: jobs are pushed after deferred updates, so the job should be able to see
2192                                 // the recent change entry (also done via deferred updates) and carry over any
2193                                 // bot/deletion/IP flags, ect.
2194                                 JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
2195                                         $this->getTitle(),
2196                                         [
2197                                                 'pageId' => $this->getId(),
2198                                                 'revTimestamp' => $revision->getTimestamp()
2199                                         ]
2200                                 ) );
2201                         }
2202                 }
2203
2204                 // Avoid PHP 7.1 warning of passing $this by reference
2205                 $wikiPage = $this;
2206
2207                 Hooks::run( 'ArticleEditUpdates', [ &$wikiPage, &$editInfo, $options['changed'] ] );
2208
2209                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$wikiPage ] ) ) {
2210                         // Flush old entries from the `recentchanges` table
2211                         if ( mt_rand( 0, 9 ) == 0 ) {
2212                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2213                         }
2214                 }
2215
2216                 if ( !$this->exists() ) {
2217                         return;
2218                 }
2219
2220                 $id = $this->getId();
2221                 $title = $this->mTitle->getPrefixedDBkey();
2222                 $shortTitle = $this->mTitle->getDBkey();
2223
2224                 if ( $options['oldcountable'] === 'no-change' ||
2225                         ( !$options['changed'] && !$options['moved'] )
2226                 ) {
2227                         $good = 0;
2228                 } elseif ( $options['created'] ) {
2229                         $good = (int)$this->isCountable( $editInfo );
2230                 } elseif ( $options['oldcountable'] !== null ) {
2231                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2232                 } else {
2233                         $good = 0;
2234                 }
2235                 $edits = $options['changed'] ? 1 : 0;
2236                 $total = $options['created'] ? 1 : 0;
2237
2238                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2239                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2240
2241                 // If this is another user's talk page, update newtalk.
2242                 // Don't do this if $options['changed'] = false (null-edits) nor if
2243                 // it's a minor edit and the user doesn't want notifications for those.
2244                 if ( $options['changed']
2245                         && $this->mTitle->getNamespace() == NS_USER_TALK
2246                         && $shortTitle != $user->getTitleKey()
2247                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2248                 ) {
2249                         $recipient = User::newFromName( $shortTitle, false );
2250                         if ( !$recipient ) {
2251                                 wfDebug( __METHOD__ . ": invalid username\n" );
2252                         } else {
2253                                 // Avoid PHP 7.1 warning of passing $this by reference
2254                                 $wikiPage = $this;
2255
2256                                 // Allow extensions to prevent user notification
2257                                 // when a new message is added to their talk page
2258                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$wikiPage, $recipient ] ) ) {
2259                                         if ( User::isIP( $shortTitle ) ) {
2260                                                 // An anonymous user
2261                                                 $recipient->setNewtalk( true, $revision );
2262                                         } elseif ( $recipient->isLoggedIn() ) {
2263                                                 $recipient->setNewtalk( true, $revision );
2264                                         } else {
2265                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2266                                         }
2267                                 }
2268                         }
2269                 }
2270
2271                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2272                         MessageCache::singleton()->updateMessageOverride( $this->mTitle, $content );
2273                 }
2274
2275                 if ( $options['created'] ) {
2276                         self::onArticleCreate( $this->mTitle );
2277                 } elseif ( $options['changed'] ) { // T52785
2278                         self::onArticleEdit( $this->mTitle, $revision );
2279                 }
2280
2281                 ResourceLoaderWikiModule::invalidateModuleCache(
2282                         $this->mTitle, $options['oldrevision'], $revision, wfWikiID()
2283                 );
2284         }
2285
2286         /**
2287          * Update the article's restriction field, and leave a log entry.
2288          * This works for protection both existing and non-existing pages.
2289          *
2290          * @param array $limit Set of restriction keys
2291          * @param array $expiry Per restriction type expiration
2292          * @param int &$cascade Set to false if cascading protection isn't allowed.
2293          * @param string $reason
2294          * @param User $user The user updating the restrictions
2295          * @param string|string[] $tags Change tags to add to the pages and protection log entries
2296          *   ($user should be able to add the specified tags before this is called)
2297          * @return Status Status object; if action is taken, $status->value is the log_id of the
2298          *   protection log entry.
2299          */
2300         public function doUpdateRestrictions( array $limit, array $expiry,
2301                 &$cascade, $reason, User $user, $tags = null
2302         ) {
2303                 global $wgCascadingRestrictionLevels;
2304
2305                 if ( wfReadOnly() ) {
2306                         return Status::newFatal( wfMessage( 'readonlytext', wfReadOnlyReason() ) );
2307                 }
2308
2309                 $this->loadPageData( 'fromdbmaster' );
2310                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2311                 $id = $this->getId();
2312
2313                 if ( !$cascade ) {
2314                         $cascade = false;
2315                 }
2316
2317                 // Take this opportunity to purge out expired restrictions
2318                 Title::purgeExpiredRestrictions();
2319
2320                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2321                 // we expect a single selection, but the schema allows otherwise.
2322                 $isProtected = false;
2323                 $protect = false;
2324                 $changed = false;
2325
2326                 $dbw = wfGetDB( DB_MASTER );
2327
2328                 foreach ( $restrictionTypes as $action ) {
2329                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2330                                 $expiry[$action] = 'infinity';
2331                         }
2332                         if ( !isset( $limit[$action] ) ) {
2333                                 $limit[$action] = '';
2334                         } elseif ( $limit[$action] != '' ) {
2335                                 $protect = true;
2336                         }
2337
2338                         // Get current restrictions on $action
2339                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2340                         if ( $current != '' ) {
2341                                 $isProtected = true;
2342                         }
2343
2344                         if ( $limit[$action] != $current ) {
2345                                 $changed = true;
2346                         } elseif ( $limit[$action] != '' ) {
2347                                 // Only check expiry change if the action is actually being
2348                                 // protected, since expiry does nothing on an not-protected
2349                                 // action.
2350                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2351                                         $changed = true;
2352                                 }
2353                         }
2354                 }
2355
2356                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2357                         $changed = true;
2358                 }
2359
2360                 // If nothing has changed, do nothing
2361                 if ( !$changed ) {
2362                         return Status::newGood();
2363                 }
2364
2365                 if ( !$protect ) { // No protection at all means unprotection
2366                         $revCommentMsg = 'unprotectedarticle-comment';
2367                         $logAction = 'unprotect';
2368                 } elseif ( $isProtected ) {
2369                         $revCommentMsg = 'modifiedarticleprotection-comment';
2370                         $logAction = 'modify';
2371                 } else {
2372                         $revCommentMsg = 'protectedarticle-comment';
2373                         $logAction = 'protect';
2374                 }
2375
2376                 $logRelationsValues = [];
2377                 $logRelationsField = null;
2378                 $logParamsDetails = [];
2379
2380                 // Null revision (used for change tag insertion)
2381                 $nullRevision = null;
2382
2383                 if ( $id ) { // Protection of existing page
2384                         // Avoid PHP 7.1 warning of passing $this by reference
2385                         $wikiPage = $this;
2386
2387                         if ( !Hooks::run( 'ArticleProtect', [ &$wikiPage, &$user, $limit, $reason ] ) ) {
2388                                 return Status::newGood();
2389                         }
2390
2391                         // Only certain restrictions can cascade...
2392                         $editrestriction = isset( $limit['edit'] )
2393                                 ? [ $limit['edit'] ]
2394                                 : $this->mTitle->getRestrictions( 'edit' );
2395                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2396                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2397                         }
2398                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2399                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2400                         }
2401
2402                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2403                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2404                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2405                         }
2406                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2407                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2408                         }
2409
2410                         // The schema allows multiple restrictions
2411                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2412                                 $cascade = false;
2413                         }
2414
2415                         // insert null revision to identify the page protection change as edit summary
2416                         $latest = $this->getLatest();
2417                         $nullRevision = $this->insertProtectNullRevision(
2418                                 $revCommentMsg,
2419                                 $limit,
2420                                 $expiry,
2421                                 $cascade,
2422                                 $reason,
2423                                 $user
2424                         );
2425
2426                         if ( $nullRevision === null ) {
2427                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2428                         }
2429
2430                         $logRelationsField = 'pr_id';
2431
2432                         // Update restrictions table
2433                         foreach ( $limit as $action => $restrictions ) {
2434                                 $dbw->delete(
2435                                         'page_restrictions',
2436                                         [
2437                                                 'pr_page' => $id,
2438                                                 'pr_type' => $action
2439                                         ],
2440                                         __METHOD__
2441                                 );
2442                                 if ( $restrictions != '' ) {
2443                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2444                                         $dbw->insert(
2445                                                 'page_restrictions',
2446                                                 [
2447                                                         'pr_page' => $id,
2448                                                         'pr_type' => $action,
2449                                                         'pr_level' => $restrictions,
2450                                                         'pr_cascade' => $cascadeValue,
2451                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2452                                                 ],
2453                                                 __METHOD__
2454                                         );
2455                                         $logRelationsValues[] = $dbw->insertId();
2456                                         $logParamsDetails[] = [
2457                                                 'type' => $action,
2458                                                 'level' => $restrictions,
2459                                                 'expiry' => $expiry[$action],
2460                                                 'cascade' => (bool)$cascadeValue,
2461                                         ];
2462                                 }
2463                         }
2464
2465                         // Clear out legacy restriction fields
2466                         $dbw->update(
2467                                 'page',
2468                                 [ 'page_restrictions' => '' ],
2469                                 [ 'page_id' => $id ],
2470                                 __METHOD__
2471                         );
2472
2473                         // Avoid PHP 7.1 warning of passing $this by reference
2474                         $wikiPage = $this;
2475
2476                         Hooks::run( 'NewRevisionFromEditComplete',
2477                                 [ $this, $nullRevision, $latest, $user ] );
2478                         Hooks::run( 'ArticleProtectComplete', [ &$wikiPage, &$user, $limit, $reason ] );
2479                 } else { // Protection of non-existing page (also known as "title protection")
2480                         // Cascade protection is meaningless in this case
2481                         $cascade = false;
2482
2483                         if ( $limit['create'] != '' ) {
2484                                 $commentFields = CommentStore::newKey( 'pt_reason' )->insert( $dbw, $reason );
2485                                 $dbw->replace( 'protected_titles',
2486                                         [ [ 'pt_namespace', 'pt_title' ] ],
2487                                         [
2488                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2489                                                 'pt_title' => $this->mTitle->getDBkey(),
2490                                                 'pt_create_perm' => $limit['create'],
2491                                                 'pt_timestamp' => $dbw->timestamp(),
2492                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2493                                                 'pt_user' => $user->getId(),
2494                                         ] + $commentFields, __METHOD__
2495                                 );
2496                                 $logParamsDetails[] = [
2497                                         'type' => 'create',
2498                                         'level' => $limit['create'],
2499                                         'expiry' => $expiry['create'],
2500                                 ];
2501                         } else {
2502                                 $dbw->delete( 'protected_titles',
2503                                         [
2504                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2505                                                 'pt_title' => $this->mTitle->getDBkey()
2506                                         ], __METHOD__
2507                                 );
2508                         }
2509                 }
2510
2511                 $this->mTitle->flushRestrictions();
2512                 InfoAction::invalidateCache( $this->mTitle );
2513
2514                 if ( $logAction == 'unprotect' ) {
2515                         $params = [];
2516                 } else {
2517                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2518                         $params = [
2519                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2520                                 '5:bool:cascade' => $cascade,
2521                                 'details' => $logParamsDetails, // parameter for localize and api
2522                         ];
2523                 }
2524
2525                 // Update the protection log
2526                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2527                 $logEntry->setTarget( $this->mTitle );
2528                 $logEntry->setComment( $reason );
2529                 $logEntry->setPerformer( $user );
2530                 $logEntry->setParameters( $params );
2531                 if ( !is_null( $nullRevision ) ) {
2532                         $logEntry->setAssociatedRevId( $nullRevision->getId() );
2533                 }
2534                 $logEntry->setTags( $tags );
2535                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2536                         $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
2537                 }
2538                 $logId = $logEntry->insert();
2539                 $logEntry->publish( $logId );
2540
2541                 return Status::newGood( $logId );
2542         }
2543
2544         /**
2545          * Insert a new null revision for this page.
2546          *
2547          * @param string $revCommentMsg Comment message key for the revision
2548          * @param array $limit Set of restriction keys
2549          * @param array $expiry Per restriction type expiration
2550          * @param int $cascade Set to false if cascading protection isn't allowed.
2551          * @param string $reason
2552          * @param User|null $user
2553          * @return Revision|null Null on error
2554          */
2555         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2556                 array $expiry, $cascade, $reason, $user = null
2557         ) {
2558                 $dbw = wfGetDB( DB_MASTER );
2559
2560                 // Prepare a null revision to be added to the history
2561                 $editComment = wfMessage(
2562                         $revCommentMsg,
2563                         $this->mTitle->getPrefixedText(),
2564                         $user ? $user->getName() : ''
2565                 )->inContentLanguage()->text();
2566                 if ( $reason ) {
2567                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2568                 }
2569                 $protectDescription = $this->protectDescription( $limit, $expiry );
2570                 if ( $protectDescription ) {
2571                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2572                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2573                                 ->inContentLanguage()->text();
2574                 }
2575                 if ( $cascade ) {
2576                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2577                         $editComment .= wfMessage( 'brackets' )->params(
2578                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2579                         )->inContentLanguage()->text();
2580                 }
2581
2582                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2583                 if ( $nullRev ) {
2584                         $nullRev->insertOn( $dbw );
2585
2586                         // Update page record and touch page
2587                         $oldLatest = $nullRev->getParentId();
2588                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2589                 }
2590
2591                 return $nullRev;
2592         }
2593
2594         /**
2595          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2596          * @return string
2597          */
2598         protected function formatExpiry( $expiry ) {
2599                 global $wgContLang;
2600
2601                 if ( $expiry != 'infinity' ) {
2602                         return wfMessage(
2603                                 'protect-expiring',
2604                                 $wgContLang->timeanddate( $expiry, false, false ),
2605                                 $wgContLang->date( $expiry, false, false ),
2606                                 $wgContLang->time( $expiry, false, false )
2607                         )->inContentLanguage()->text();
2608                 } else {
2609                         return wfMessage( 'protect-expiry-indefinite' )
2610                                 ->inContentLanguage()->text();
2611                 }
2612         }
2613
2614         /**
2615          * Builds the description to serve as comment for the edit.
2616          *
2617          * @param array $limit Set of restriction keys
2618          * @param array $expiry Per restriction type expiration
2619          * @return string
2620          */
2621         public function protectDescription( array $limit, array $expiry ) {
2622                 $protectDescription = '';
2623
2624                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2625                         # $action is one of $wgRestrictionTypes = [ 'create', 'edit', 'move', 'upload' ].
2626                         # All possible message keys are listed here for easier grepping:
2627                         # * restriction-create
2628                         # * restriction-edit
2629                         # * restriction-move
2630                         # * restriction-upload
2631                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2632                         # $restrictions is one of $wgRestrictionLevels = [ '', 'autoconfirmed', 'sysop' ],
2633                         # with '' filtered out. All possible message keys are listed below:
2634                         # * protect-level-autoconfirmed
2635                         # * protect-level-sysop
2636                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
2637                                 ->inContentLanguage()->text();
2638
2639                         $expiryText = $this->formatExpiry( $expiry[$action] );
2640
2641                         if ( $protectDescription !== '' ) {
2642                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2643                         }
2644                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2645                                 ->params( $actionText, $restrictionsText, $expiryText )
2646                                 ->inContentLanguage()->text();
2647                 }
2648
2649                 return $protectDescription;
2650         }
2651
2652         /**
2653          * Builds the description to serve as comment for the log entry.
2654          *
2655          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2656          * protect description text. Keep them in old format to avoid breaking compatibility.
2657          * TODO: Fix protection log to store structured description and format it on-the-fly.
2658          *
2659          * @param array $limit Set of restriction keys
2660          * @param array $expiry Per restriction type expiration
2661          * @return string
2662          */
2663         public function protectDescriptionLog( array $limit, array $expiry ) {
2664                 global $wgContLang;
2665
2666                 $protectDescriptionLog = '';
2667
2668                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2669                         $expiryText = $this->formatExpiry( $expiry[$action] );
2670                         $protectDescriptionLog .= $wgContLang->getDirMark() .
2671                                 "[$action=$restrictions] ($expiryText)";
2672                 }
2673
2674                 return trim( $protectDescriptionLog );
2675         }
2676
2677         /**
2678          * Take an array of page restrictions and flatten it to a string
2679          * suitable for insertion into the page_restrictions field.
2680          *
2681          * @param string[] $limit
2682          *
2683          * @throws MWException
2684          * @return string
2685          */
2686         protected static function flattenRestrictions( $limit ) {
2687                 if ( !is_array( $limit ) ) {
2688                         throw new MWException( __METHOD__ . ' given non-array restriction set' );
2689                 }
2690
2691                 $bits = [];
2692                 ksort( $limit );
2693
2694                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2695                         $bits[] = "$action=$restrictions";
2696                 }
2697
2698                 return implode( ':', $bits );
2699         }
2700
2701         /**
2702          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2703          * backwards compatibility, if you care about error reporting you should use
2704          * doDeleteArticleReal() instead.
2705          *
2706          * Deletes the article with database consistency, writes logs, purges caches
2707          *
2708          * @param string $reason Delete reason for deletion log
2709          * @param bool $suppress Suppress all revisions and log the deletion in
2710          *        the suppression log instead of the deletion log
2711          * @param int $u1 Unused
2712          * @param bool $u2 Unused
2713          * @param array|string &$error Array of errors to append to
2714          * @param User $user The deleting user
2715          * @return bool True if successful
2716          */
2717         public function doDeleteArticle(
2718                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2719         ) {
2720                 $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
2721                 return $status->isGood();
2722         }
2723
2724         /**
2725          * Back-end article deletion
2726          * Deletes the article with database consistency, writes logs, purges caches
2727          *
2728          * @since 1.19
2729          *
2730          * @param string $reason Delete reason for deletion log
2731          * @param bool $suppress Suppress all revisions and log the deletion in
2732          *   the suppression log instead of the deletion log
2733          * @param int $u1 Unused
2734          * @param bool $u2 Unused
2735          * @param array|string &$error Array of errors to append to
2736          * @param User $user The deleting user
2737          * @param array $tags Tags to apply to the deletion action
2738          * @param string $logsubtype
2739          * @return Status Status object; if successful, $status->value is the log_id of the
2740          *   deletion log entry. If the page couldn't be deleted because it wasn't
2741          *   found, $status is a non-fatal 'cannotdelete' error
2742          */
2743         public function doDeleteArticleReal(
2744                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2745                 $tags = [], $logsubtype = 'delete'
2746         ) {
2747                 global $wgUser, $wgContentHandlerUseDB, $wgCommentTableSchemaMigrationStage;
2748
2749                 wfDebug( __METHOD__ . "\n" );
2750
2751                 $status = Status::newGood();
2752
2753                 if ( $this->mTitle->getDBkey() === '' ) {
2754                         $status->error( 'cannotdelete',
2755                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2756                         return $status;
2757                 }
2758
2759                 // Avoid PHP 7.1 warning of passing $this by reference
2760                 $wikiPage = $this;
2761
2762                 $user = is_null( $user ) ? $wgUser : $user;
2763                 if ( !Hooks::run( 'ArticleDelete',
2764                         [ &$wikiPage, &$user, &$reason, &$error, &$status, $suppress ]
2765                 ) ) {
2766                         if ( $status->isOK() ) {
2767                                 // Hook aborted but didn't set a fatal status
2768                                 $status->fatal( 'delete-hook-aborted' );
2769                         }
2770                         return $status;
2771                 }
2772
2773                 $dbw = wfGetDB( DB_MASTER );
2774                 $dbw->startAtomic( __METHOD__ );
2775
2776                 $this->loadPageData( self::READ_LATEST );
2777                 $id = $this->getId();
2778                 // T98706: lock the page from various other updates but avoid using
2779                 // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2780                 // the revisions queries (which also JOIN on user). Only lock the page
2781                 // row and CAS check on page_latest to see if the trx snapshot matches.
2782                 $lockedLatest = $this->lockAndGetLatest();
2783                 if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
2784                         $dbw->endAtomic( __METHOD__ );
2785                         // Page not there or trx snapshot is stale
2786                         $status->error( 'cannotdelete',
2787                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2788                         return $status;
2789                 }
2790
2791                 // Given the lock above, we can be confident in the title and page ID values
2792                 $namespace = $this->getTitle()->getNamespace();
2793                 $dbKey = $this->getTitle()->getDBkey();
2794
2795                 // At this point we are now comitted to returning an OK
2796                 // status unless some DB query error or other exception comes up.
2797                 // This way callers don't have to call rollback() if $status is bad
2798                 // unless they actually try to catch exceptions (which is rare).
2799
2800                 // we need to remember the old content so we can use it to generate all deletion updates.
2801                 $revision = $this->getRevision();
2802                 try {
2803                         $content = $this->getContent( Revision::RAW );
2804                 } catch ( Exception $ex ) {
2805                         wfLogWarning( __METHOD__ . ': failed to load content during deletion! '
2806                                 . $ex->getMessage() );
2807
2808                         $content = null;
2809                 }
2810
2811                 $revCommentStore = new CommentStore( 'rev_comment' );
2812                 $arCommentStore = new CommentStore( 'ar_comment' );
2813
2814                 $fields = Revision::selectFields();
2815                 $bitfield = false;
2816
2817                 // Bitfields to further suppress the content
2818                 if ( $suppress ) {
2819                         $bitfield = Revision::SUPPRESSED_ALL;
2820                         $fields = array_diff( $fields, [ 'rev_deleted' ] );
2821                 }
2822
2823                 // For now, shunt the revision data into the archive table.
2824                 // Text is *not* removed from the text table; bulk storage
2825                 // is left intact to avoid breaking block-compression or
2826                 // immutable storage schemes.
2827                 // In the future, we may keep revisions and mark them with
2828                 // the rev_deleted field, which is reserved for this purpose.
2829
2830                 // Get all of the page revisions
2831                 $commentQuery = $revCommentStore->getJoin();
2832                 $res = $dbw->select(
2833                         [ 'revision' ] + $commentQuery['tables'],
2834                         $fields + $commentQuery['fields'],
2835                         [ 'rev_page' => $id ],
2836                         __METHOD__,
2837                         'FOR UPDATE',
2838                         $commentQuery['joins']
2839                 );
2840
2841                 // Build their equivalent archive rows
2842                 $rowsInsert = [];
2843                 $revids = [];
2844
2845                 /** @var int[] Revision IDs of edits that were made by IPs */
2846                 $ipRevIds = [];
2847
2848                 foreach ( $res as $row ) {
2849                         $comment = $revCommentStore->getComment( $row );
2850                         $rowInsert = [
2851                                 'ar_namespace'  => $namespace,
2852                                 'ar_title'      => $dbKey,
2853                                 'ar_user'       => $row->rev_user,
2854                                 'ar_user_text'  => $row->rev_user_text,
2855                                 'ar_timestamp'  => $row->rev_timestamp,
2856                                 'ar_minor_edit' => $row->rev_minor_edit,
2857                                 'ar_rev_id'     => $row->rev_id,
2858                                 'ar_parent_id'  => $row->rev_parent_id,
2859                                 'ar_text_id'    => $row->rev_text_id,
2860                                 'ar_text'       => '',
2861                                 'ar_flags'      => '',
2862                                 'ar_len'        => $row->rev_len,
2863                                 'ar_page_id'    => $id,
2864                                 'ar_deleted'    => $suppress ? $bitfield : $row->rev_deleted,
2865                                 'ar_sha1'       => $row->rev_sha1,
2866                         ] + $arCommentStore->insert( $dbw, $comment );
2867                         if ( $wgContentHandlerUseDB ) {
2868                                 $rowInsert['ar_content_model'] = $row->rev_content_model;
2869                                 $rowInsert['ar_content_format'] = $row->rev_content_format;
2870                         }
2871                         $rowsInsert[] = $rowInsert;
2872                         $revids[] = $row->rev_id;
2873
2874                         // Keep track of IP edits, so that the corresponding rows can
2875                         // be deleted in the ip_changes table.
2876                         if ( (int)$row->rev_user === 0 && IP::isValid( $row->rev_user_text ) ) {
2877                                 $ipRevIds[] = $row->rev_id;
2878                         }
2879                 }
2880                 // Copy them into the archive table
2881                 $dbw->insert( 'archive', $rowsInsert, __METHOD__ );
2882                 // Save this so we can pass it to the ArticleDeleteComplete hook.
2883                 $archivedRevisionCount = $dbw->affectedRows();
2884
2885                 // Clone the title and wikiPage, so we have the information we need when
2886                 // we log and run the ArticleDeleteComplete hook.
2887                 $logTitle = clone $this->mTitle;
2888                 $wikiPageBeforeDelete = clone $this;
2889
2890                 // Now that it's safely backed up, delete it
2891                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
2892                 $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
2893                 if ( $wgCommentTableSchemaMigrationStage > MIGRATION_OLD ) {
2894                         $dbw->delete( 'revision_comment_temp', [ 'revcomment_rev' => $revids ], __METHOD__ );
2895                 }
2896
2897                 // Also delete records from ip_changes as applicable.
2898                 if ( count( $ipRevIds ) > 0 ) {
2899                         $dbw->delete( 'ip_changes', [ 'ipc_rev_id' => $ipRevIds ], __METHOD__ );
2900                 }
2901
2902                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
2903                 $logtype = $suppress ? 'suppress' : 'delete';
2904
2905                 $logEntry = new ManualLogEntry( $logtype, $logsubtype );
2906                 $logEntry->setPerformer( $user );
2907                 $logEntry->setTarget( $logTitle );
2908                 $logEntry->setComment( $reason );
2909                 $logEntry->setTags( $tags );
2910                 $logid = $logEntry->insert();
2911
2912                 $dbw->onTransactionPreCommitOrIdle(
2913                         function () use ( $dbw, $logEntry, $logid ) {
2914                                 // T58776: avoid deadlocks (especially from FileDeleteForm)
2915                                 $logEntry->publish( $logid );
2916                         },
2917                         __METHOD__
2918                 );
2919
2920                 $dbw->endAtomic( __METHOD__ );
2921
2922                 $this->doDeleteUpdates( $id, $content, $revision );
2923
2924                 Hooks::run( 'ArticleDeleteComplete', [
2925                         &$wikiPageBeforeDelete,
2926                         &$user,
2927                         $reason,
2928                         $id,
2929                         $content,
2930                         $logEntry,
2931                         $archivedRevisionCount
2932                 ] );
2933                 $status->value = $logid;
2934
2935                 // Show log excerpt on 404 pages rather than just a link
2936                 $cache = MediaWikiServices::getInstance()->getMainObjectStash();
2937                 $key = $cache->makeKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
2938                 $cache->set( $key, 1, $cache::TTL_DAY );
2939
2940                 return $status;
2941         }
2942
2943         /**
2944          * Lock the page row for this title+id and return page_latest (or 0)
2945          *
2946          * @return int Returns 0 if no row was found with this title+id
2947          * @since 1.27
2948          */
2949         public function lockAndGetLatest() {
2950                 return (int)wfGetDB( DB_MASTER )->selectField(
2951                         'page',
2952                         'page_latest',
2953                         [
2954                                 'page_id' => $this->getId(),
2955                                 // Typically page_id is enough, but some code might try to do
2956                                 // updates assuming the title is the same, so verify that
2957                                 'page_namespace' => $this->getTitle()->getNamespace(),
2958                                 'page_title' => $this->getTitle()->getDBkey()
2959                         ],
2960                         __METHOD__,
2961                         [ 'FOR UPDATE' ]
2962                 );
2963         }
2964
2965         /**
2966          * Do some database updates after deletion
2967          *
2968          * @param int $id The page_id value of the page being deleted
2969          * @param Content|null $content Optional page content to be used when determining
2970          *   the required updates. This may be needed because $this->getContent()
2971          *   may already return null when the page proper was deleted.
2972          * @param Revision|null $revision The latest page revision
2973          */
2974         public function doDeleteUpdates( $id, Content $content = null, Revision $revision = null ) {
2975                 try {
2976                         $countable = $this->isCountable();
2977                 } catch ( Exception $ex ) {
2978                         // fallback for deleting broken pages for which we cannot load the content for
2979                         // some reason. Note that doDeleteArticleReal() already logged this problem.
2980                         $countable = false;
2981                 }
2982
2983                 // Update site status
2984                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$countable, -1 ) );
2985
2986                 // Delete pagelinks, update secondary indexes, etc
2987                 $updates = $this->getDeletionUpdates( $content );
2988                 foreach ( $updates as $update ) {
2989                         DeferredUpdates::addUpdate( $update );
2990                 }
2991
2992                 // Reparse any pages transcluding this page
2993                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
2994
2995                 // Reparse any pages including this image
2996                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
2997                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
2998                 }
2999
3000                 // Clear caches
3001                 self::onArticleDelete( $this->mTitle );
3002                 ResourceLoaderWikiModule::invalidateModuleCache(
3003                         $this->mTitle, $revision, null, wfWikiID()
3004                 );
3005
3006                 // Reset this object and the Title object
3007                 $this->loadFromRow( false, self::READ_LATEST );
3008
3009                 // Search engine
3010                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
3011         }
3012
3013         /**
3014          * Roll back the most recent consecutive set of edits to a page
3015          * from the same user; fails if there are no eligible edits to
3016          * roll back to, e.g. user is the sole contributor. This function
3017          * performs permissions checks on $user, then calls commitRollback()
3018          * to do the dirty work
3019          *
3020          * @todo Separate the business/permission stuff out from backend code
3021          * @todo Remove $token parameter. Already verified by RollbackAction and ApiRollback.
3022          *
3023          * @param string $fromP Name of the user whose edits to rollback.
3024          * @param string $summary Custom summary. Set to default summary if empty.
3025          * @param string $token Rollback token.
3026          * @param bool $bot If true, mark all reverted edits as bot.
3027          *
3028          * @param array &$resultDetails Array contains result-specific array of additional values
3029          *    'alreadyrolled' : 'current' (rev)
3030          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3031          *
3032          * @param User $user The user performing the rollback
3033          * @param array|null $tags Change tags to apply to the rollback
3034          * Callers are responsible for permission checks
3035          * (with ChangeTags::canAddTagsAccompanyingChange)
3036          *
3037          * @return array Array of errors, each error formatted as
3038          *   array(messagekey, param1, param2, ...).
3039          * On success, the array is empty.  This array can also be passed to
3040          * OutputPage::showPermissionsErrorPage().
3041          */
3042         public function doRollback(
3043                 $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
3044         ) {
3045                 $resultDetails = null;
3046
3047                 // Check permissions
3048                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
3049                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
3050                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3051
3052                 if ( !$user->matchEditToken( $token, 'rollback' ) ) {
3053                         $errors[] = [ 'sessionfailure' ];
3054                 }
3055
3056                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
3057                         $errors[] = [ 'actionthrottledtext' ];
3058                 }
3059
3060                 // If there were errors, bail out now
3061                 if ( !empty( $errors ) ) {
3062                         return $errors;
3063                 }
3064
3065                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
3066         }
3067
3068         /**
3069          * Backend implementation of doRollback(), please refer there for parameter
3070          * and return value documentation
3071          *
3072          * NOTE: This function does NOT check ANY permissions, it just commits the
3073          * rollback to the DB. Therefore, you should only call this function direct-
3074          * ly if you want to use custom permissions checks. If you don't, use
3075          * doRollback() instead.
3076          * @param string $fromP Name of the user whose edits to rollback.
3077          * @param string $summary Custom summary. Set to default summary if empty.
3078          * @param bool $bot If true, mark all reverted edits as bot.
3079          *
3080          * @param array &$resultDetails Contains result-specific array of additional values
3081          * @param User $guser The user performing the rollback
3082          * @param array|null $tags Change tags to apply to the rollback
3083          * Callers are responsible for permission checks
3084          * (with ChangeTags::canAddTagsAccompanyingChange)
3085          *
3086          * @return array
3087          */
3088         public function commitRollback( $fromP, $summary, $bot,
3089                 &$resultDetails, User $guser, $tags = null
3090         ) {
3091                 global $wgUseRCPatrol, $wgContLang;
3092
3093                 $dbw = wfGetDB( DB_MASTER );
3094
3095                 if ( wfReadOnly() ) {
3096                         return [ [ 'readonlytext' ] ];
3097                 }
3098
3099                 // Get the last editor
3100                 $current = $this->getRevision();
3101                 if ( is_null( $current ) ) {
3102                         // Something wrong... no page?
3103                         return [ [ 'notanarticle' ] ];
3104                 }
3105
3106                 $from = str_replace( '_', ' ', $fromP );
3107                 // User name given should match up with the top revision.
3108                 // If the user was deleted then $from should be empty.
3109                 if ( $from != $current->getUserText() ) {
3110                         $resultDetails = [ 'current' => $current ];
3111                         return [ [ 'alreadyrolled',
3112                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3113                                 htmlspecialchars( $fromP ),
3114                                 htmlspecialchars( $current->getUserText() )
3115                         ] ];
3116                 }
3117
3118                 // Get the last edit not by this person...
3119                 // Note: these may not be public values
3120                 $user = intval( $current->getUser( Revision::RAW ) );
3121                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3122                 $s = $dbw->selectRow( 'revision',
3123                         [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
3124                         [ 'rev_page' => $current->getPage(),
3125                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3126                         ], __METHOD__,
3127                         [ 'USE INDEX' => 'page_timestamp',
3128                                 'ORDER BY' => 'rev_timestamp DESC' ]
3129                         );
3130                 if ( $s === false ) {
3131                         // No one else ever edited this page
3132                         return [ [ 'cantrollback' ] ];
3133                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3134                         || $s->rev_deleted & Revision::DELETED_USER
3135                 ) {
3136                         // Only admins can see this text
3137                         return [ [ 'notvisiblerev' ] ];
3138                 }
3139
3140                 // Generate the edit summary if necessary
3141                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3142                 if ( empty( $summary ) ) {
3143                         if ( $from == '' ) { // no public user name
3144                                 $summary = wfMessage( 'revertpage-nouser' );
3145                         } else {
3146                                 $summary = wfMessage( 'revertpage' );
3147                         }
3148                 }
3149
3150                 // Allow the custom summary to use the same args as the default message
3151                 $args = [
3152                         $target->getUserText(), $from, $s->rev_id,
3153                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3154                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3155                 ];
3156                 if ( $summary instanceof Message ) {
3157                         $summary = $summary->params( $args )->inContentLanguage()->text();
3158                 } else {
3159                         $summary = wfMsgReplaceArgs( $summary, $args );
3160                 }
3161
3162                 // Trim spaces on user supplied text
3163                 $summary = trim( $summary );
3164
3165                 // Save
3166                 $flags = EDIT_UPDATE | EDIT_INTERNAL;
3167
3168                 if ( $guser->isAllowed( 'minoredit' ) ) {
3169                         $flags |= EDIT_MINOR;
3170                 }
3171
3172                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3173                         $flags |= EDIT_FORCE_BOT;
3174                 }
3175
3176                 $targetContent = $target->getContent();
3177                 $changingContentModel = $targetContent->getModel() !== $current->getContentModel();
3178
3179                 // Actually store the edit
3180                 $status = $this->doEditContent(
3181                         $targetContent,
3182                         $summary,
3183                         $flags,
3184                         $target->getId(),
3185                         $guser,
3186                         null,
3187                         $tags
3188                 );
3189
3190                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3191                 // This is done even on edit failure to have patrolling in that case (T64157).
3192                 $set = [];
3193                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3194                         // Mark all reverted edits as bot
3195                         $set['rc_bot'] = 1;
3196                 }
3197
3198                 if ( $wgUseRCPatrol ) {
3199                         // Mark all reverted edits as patrolled
3200                         $set['rc_patrolled'] = 1;
3201                 }
3202
3203                 if ( count( $set ) ) {
3204                         $dbw->update( 'recentchanges', $set,
3205                                 [ /* WHERE */
3206                                         'rc_cur_id' => $current->getPage(),
3207                                         'rc_user_text' => $current->getUserText(),
3208                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3209                                 ],
3210                                 __METHOD__
3211                         );
3212                 }
3213
3214                 if ( !$status->isOK() ) {
3215                         return $status->getErrorsArray();
3216                 }
3217
3218                 // raise error, when the edit is an edit without a new version
3219                 $statusRev = isset( $status->value['revision'] )
3220                         ? $status->value['revision']
3221                         : null;
3222                 if ( !( $statusRev instanceof Revision ) ) {
3223                         $resultDetails = [ 'current' => $current ];
3224                         return [ [ 'alreadyrolled',
3225                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3226                                         htmlspecialchars( $fromP ),
3227                                         htmlspecialchars( $current->getUserText() )
3228                         ] ];
3229                 }
3230
3231                 if ( $changingContentModel ) {
3232                         // If the content model changed during the rollback,
3233                         // make sure it gets logged to Special:Log/contentmodel
3234                         $log = new ManualLogEntry( 'contentmodel', 'change' );
3235                         $log->setPerformer( $guser );
3236                         $log->setTarget( $this->mTitle );
3237                         $log->setComment( $summary );
3238                         $log->setParameters( [
3239                                 '4::oldmodel' => $current->getContentModel(),
3240                                 '5::newmodel' => $targetContent->getModel(),
3241                         ] );
3242
3243                         $logId = $log->insert( $dbw );
3244                         $log->publish( $logId );
3245                 }
3246
3247                 $revId = $statusRev->getId();
3248
3249                 Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );
3250
3251                 $resultDetails = [
3252                         'summary' => $summary,
3253                         'current' => $current,
3254                         'target' => $target,
3255                         'newid' => $revId
3256                 ];
3257
3258                 return [];
3259         }
3260
3261         /**
3262          * The onArticle*() functions are supposed to be a kind of hooks
3263          * which should be called whenever any of the specified actions
3264          * are done.
3265          *
3266          * This is a good place to put code to clear caches, for instance.
3267          *
3268          * This is called on page move and undelete, as well as edit
3269          *
3270          * @param Title $title
3271          */
3272         public static function onArticleCreate( Title $title ) {
3273                 // Update existence markers on article/talk tabs...
3274                 $other = $title->getOtherPage();
3275
3276                 $other->purgeSquid();
3277
3278                 $title->touchLinks();
3279                 $title->purgeSquid();
3280                 $title->deleteTitleProtection();
3281
3282                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3283
3284                 // Invalidate caches of articles which include this page
3285                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3286
3287                 if ( $title->getNamespace() == NS_CATEGORY ) {
3288                         // Load the Category object, which will schedule a job to create
3289                         // the category table row if necessary. Checking a replica DB is ok
3290                         // here, in the worst case it'll run an unnecessary recount job on
3291                         // a category that probably doesn't have many members.
3292                         Category::newFromTitle( $title )->getID();
3293                 }
3294         }
3295
3296         /**
3297          * Clears caches when article is deleted
3298          *
3299          * @param Title $title
3300          */
3301         public static function onArticleDelete( Title $title ) {
3302                 // Update existence markers on article/talk tabs...
3303                 $other = $title->getOtherPage();
3304
3305                 $other->purgeSquid();
3306
3307                 $title->touchLinks();
3308                 $title->purgeSquid();
3309
3310                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3311
3312                 // File cache
3313                 HTMLFileCache::clearFileCache( $title );
3314                 InfoAction::invalidateCache( $title );
3315
3316                 // Messages
3317                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3318                         MessageCache::singleton()->updateMessageOverride( $title, null );
3319                 }
3320
3321                 // Images
3322                 if ( $title->getNamespace() == NS_FILE ) {
3323                         DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
3324                 }
3325
3326                 // User talk pages
3327                 if ( $title->getNamespace() == NS_USER_TALK ) {
3328                         $user = User::newFromName( $title->getText(), false );
3329                         if ( $user ) {
3330                                 $user->setNewtalk( false );
3331                         }
3332                 }
3333
3334                 // Image redirects
3335                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3336         }
3337
3338         /**
3339          * Purge caches on page update etc
3340          *
3341          * @param Title $title
3342          * @param Revision|null $revision Revision that was just saved, may be null
3343          */
3344         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3345                 // Invalidate caches of articles which include this page
3346                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3347
3348                 // Invalidate the caches of all pages which redirect here
3349                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
3350
3351                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3352
3353                 // Purge CDN for this page only
3354                 $title->purgeSquid();
3355                 // Clear file cache for this page only
3356                 HTMLFileCache::clearFileCache( $title );
3357
3358                 $revid = $revision ? $revision->getId() : null;
3359                 DeferredUpdates::addCallableUpdate( function () use ( $title, $revid ) {
3360                         InfoAction::invalidateCache( $title, $revid );
3361                 } );
3362         }
3363
3364         /**#@-*/
3365
3366         /**
3367          * Returns a list of categories this page is a member of.
3368          * Results will include hidden categories
3369          *
3370          * @return TitleArray
3371          */
3372         public function getCategories() {
3373                 $id = $this->getId();
3374                 if ( $id == 0 ) {
3375                         return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
3376                 }
3377
3378                 $dbr = wfGetDB( DB_REPLICA );
3379                 $res = $dbr->select( 'categorylinks',
3380                         [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
3381                         // Have to do that since Database::fieldNamesWithAlias treats numeric indexes
3382                         // as not being aliases, and NS_CATEGORY is numeric
3383                         [ 'cl_from' => $id ],
3384                         __METHOD__ );
3385
3386                 return TitleArray::newFromResult( $res );
3387         }
3388
3389         /**
3390          * Returns a list of hidden categories this page is a member of.
3391          * Uses the page_props and categorylinks tables.
3392          *
3393          * @return array Array of Title objects
3394          */
3395         public function getHiddenCategories() {
3396                 $result = [];
3397                 $id = $this->getId();
3398
3399                 if ( $id == 0 ) {
3400                         return [];
3401                 }
3402
3403                 $dbr = wfGetDB( DB_REPLICA );
3404                 $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
3405                         [ 'cl_to' ],
3406                         [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3407                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
3408                         __METHOD__ );
3409
3410                 if ( $res !== false ) {
3411                         foreach ( $res as $row ) {
3412                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3413                         }
3414                 }
3415
3416                 return $result;
3417         }
3418
3419         /**
3420          * Auto-generates a deletion reason
3421          *
3422          * @param bool &$hasHistory Whether the page has a history
3423          * @return string|bool String containing deletion reason or empty string, or boolean false
3424          *    if no revision occurred
3425          */
3426         public function getAutoDeleteReason( &$hasHistory ) {
3427                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3428         }
3429
3430         /**
3431          * Update all the appropriate counts in the category table, given that
3432          * we've added the categories $added and deleted the categories $deleted.
3433          *
3434          * This should only be called from deferred updates or jobs to avoid contention.
3435          *
3436          * @param array $added The names of categories that were added
3437          * @param array $deleted The names of categories that were deleted
3438          * @param int $id Page ID (this should be the original deleted page ID)
3439          */
3440         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
3441                 $id = $id ?: $this->getId();
3442                 $ns = $this->getTitle()->getNamespace();
3443
3444                 $addFields = [ 'cat_pages = cat_pages + 1' ];
3445                 $removeFields = [ 'cat_pages = cat_pages - 1' ];
3446                 if ( $ns == NS_CATEGORY ) {
3447                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3448                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3449                 } elseif ( $ns == NS_FILE ) {
3450                         $addFields[] = 'cat_files = cat_files + 1';
3451                         $removeFields[] = 'cat_files = cat_files - 1';
3452                 }
3453
3454                 $dbw = wfGetDB( DB_MASTER );
3455
3456                 if ( count( $added ) ) {
3457                         $existingAdded = $dbw->selectFieldValues(
3458                                 'category',
3459                                 'cat_title',
3460                                 [ 'cat_title' => $added ],
3461                                 __METHOD__
3462                         );
3463
3464                         // For category rows that already exist, do a plain
3465                         // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
3466                         // to avoid creating gaps in the cat_id sequence.
3467                         if ( count( $existingAdded ) ) {
3468                                 $dbw->update(
3469                                         'category',
3470                                         $addFields,
3471                                         [ 'cat_title' => $existingAdded ],
3472                                         __METHOD__
3473                                 );
3474                         }
3475
3476                         $missingAdded = array_diff( $added, $existingAdded );
3477                         if ( count( $missingAdded ) ) {
3478                                 $insertRows = [];
3479                                 foreach ( $missingAdded as $cat ) {
3480                                         $insertRows[] = [
3481                                                 'cat_title'   => $cat,
3482                                                 'cat_pages'   => 1,
3483                                                 'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3484                                                 'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3485                                         ];
3486                                 }
3487                                 $dbw->upsert(
3488                                         'category',
3489                                         $insertRows,
3490                                         [ 'cat_title' ],
3491                                         $addFields,
3492                                         __METHOD__
3493                                 );
3494                         }
3495                 }
3496
3497                 if ( count( $deleted ) ) {
3498                         $dbw->update(
3499                                 'category',
3500                                 $removeFields,
3501                                 [ 'cat_title' => $deleted ],
3502                                 __METHOD__
3503                         );
3504                 }
3505
3506                 foreach ( $added as $catName ) {
3507                         $cat = Category::newFromName( $catName );
3508                         Hooks::run( 'CategoryAfterPageAdded', [ $cat, $this ] );
3509                 }
3510
3511                 foreach ( $deleted as $catName ) {
3512                         $cat = Category::newFromName( $catName );
3513                         Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $this, $id ] );
3514                 }
3515
3516                 // Refresh counts on categories that should be empty now, to
3517                 // trigger possible deletion. Check master for the most
3518                 // up-to-date cat_pages.
3519                 if ( count( $deleted ) ) {
3520                         $rows = $dbw->select(
3521                                 'category',
3522                                 [ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ],
3523                                 [ 'cat_title' => $deleted, 'cat_pages <= 0' ],
3524                                 __METHOD__
3525                         );
3526                         foreach ( $rows as $row ) {
3527                                 $cat = Category::newFromRow( $row );
3528                                 // T166757: do the update after this DB commit
3529                                 DeferredUpdates::addCallableUpdate( function () use ( $cat ) {
3530                                         $cat->refreshCounts();
3531                                 } );
3532                         }
3533                 }
3534         }
3535
3536         /**
3537          * Opportunistically enqueue link update jobs given fresh parser output if useful
3538          *
3539          * @param ParserOutput $parserOutput Current version page output
3540          * @since 1.25
3541          */
3542         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3543                 if ( wfReadOnly() ) {
3544                         return;
3545                 }
3546
3547                 if ( !Hooks::run( 'OpportunisticLinksUpdate',
3548                         [ $this, $this->mTitle, $parserOutput ]
3549                 ) ) {
3550                         return;
3551                 }
3552
3553                 $config = RequestContext::getMain()->getConfig();
3554
3555                 $params = [
3556                         'isOpportunistic' => true,
3557                         'rootJobTimestamp' => $parserOutput->getCacheTime()
3558                 ];
3559
3560                 if ( $this->mTitle->areRestrictionsCascading() ) {
3561                         // If the page is cascade protecting, the links should really be up-to-date
3562                         JobQueueGroup::singleton()->lazyPush(
3563                                 RefreshLinksJob::newPrioritized( $this->mTitle, $params )
3564                         );
3565                 } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
3566                         // Assume the output contains "dynamic" time/random based magic words.
3567                         // Only update pages that expired due to dynamic content and NOT due to edits
3568                         // to referenced templates/files. When the cache expires due to dynamic content,
3569                         // page_touched is unchanged. We want to avoid triggering redundant jobs due to
3570                         // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
3571                         // template/file edit already triggered recursive RefreshLinksJob jobs.
3572                         if ( $this->getLinksTimestamp() > $this->getTouched() ) {
3573                                 // If a page is uncacheable, do not keep spamming a job for it.
3574                                 // Although it would be de-duplicated, it would still waste I/O.
3575                                 $cache = ObjectCache::getLocalClusterInstance();
3576                                 $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
3577                                 $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
3578                                 if ( $cache->add( $key, time(), $ttl ) ) {
3579                                         JobQueueGroup::singleton()->lazyPush(
3580                                                 RefreshLinksJob::newDynamic( $this->mTitle, $params )
3581                                         );
3582                                 }
3583                         }
3584                 }
3585         }
3586
3587         /**
3588          * Returns a list of updates to be performed when this page is deleted. The
3589          * updates should remove any information about this page from secondary data
3590          * stores such as links tables.
3591          *
3592          * @param Content|null $content Optional Content object for determining the
3593          *   necessary updates.
3594          * @return DeferrableUpdate[]
3595          */
3596         public function getDeletionUpdates( Content $content = null ) {
3597                 if ( !$content ) {
3598                         // load content object, which may be used to determine the necessary updates.
3599                         // XXX: the content may not be needed to determine the updates.
3600                         try {
3601                                 $content = $this->getContent( Revision::RAW );
3602                         } catch ( Exception $ex ) {
3603                                 // If we can't load the content, something is wrong. Perhaps that's why
3604                                 // the user is trying to delete the page, so let's not fail in that case.
3605                                 // Note that doDeleteArticleReal() will already have logged an issue with
3606                                 // loading the content.
3607                         }
3608                 }
3609
3610                 if ( !$content ) {
3611                         $updates = [];
3612                 } else {
3613                         $updates = $content->getDeletionUpdates( $this );
3614                 }
3615
3616                 Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
3617                 return $updates;
3618         }
3619
3620         /**
3621          * Whether this content displayed on this page
3622          * comes from the local database
3623          *
3624          * @since 1.28
3625          * @return bool
3626          */
3627         public function isLocal() {
3628                 return true;
3629         }
3630
3631         /**
3632          * The display name for the site this content
3633          * come from. If a subclass overrides isLocal(),
3634          * this could return something other than the
3635          * current site name
3636          *
3637          * @since 1.28
3638          * @return string
3639          */
3640         public function getWikiDisplayName() {
3641                 global $wgSitename;
3642                 return $wgSitename;
3643         }
3644
3645         /**
3646          * Get the source URL for the content on this page,
3647          * typically the canonical URL, but may be a remote
3648          * link if the content comes from another site
3649          *
3650          * @since 1.28
3651          * @return string
3652          */
3653         public function getSourceURL() {
3654                 return $this->getTitle()->getCanonicalURL();
3655         }
3656
3657         /**
3658          * @param WANObjectCache $cache
3659          * @return string[]
3660          * @since 1.28
3661          */
3662         public function getMutableCacheKeys( WANObjectCache $cache ) {
3663                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
3664
3665                 return $linkCache->getMutableCacheKeys( $cache, $this->getTitle()->getTitleValue() );
3666         }
3667 }