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         /**
  92          * Constructor and clear the article
  93          * @param Title $title Reference to a Title object.
  94          */
  95         public function __construct( Title $title ) {
  96                 $this->mTitle = $title;
  97         }
  98
  99         /**
 100          * Makes sure that the mTitle object is cloned
 101          * to the newly cloned WikiPage.
 102          */
 103         public function __clone() {
 104                 $this->mTitle = clone $this->mTitle;
 105         }
 106
 107         /**
 108          * Create a WikiPage object of the appropriate class for the given title.
 109          *
 110          * @param Title $title
 111          *
 112          * @throws MWException
 113          * @return WikiPage|WikiCategoryPage|WikiFilePage
 114          */
 115         public static function factory( Title $title ) {
 116                 $ns = $title->getNamespace();
 117
 118                 if ( $ns == NS_MEDIA ) {
 119                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 120                 } elseif ( $ns < 0 ) {
 121                         throw new MWException( "Invalid or virtual namespace $ns given." );
 122                 }
 123
 124                 $page = null;
 125                 if ( !Hooks::run( 'WikiPageFactory', [ $title, &$page ] ) ) {
 126                         return $page;
 127                 }
 128
 129                 switch ( $ns ) {
 130                         case NS_FILE:
 131                                 $page = new WikiFilePage( $title );
 132                                 break;
 133                         case NS_CATEGORY:
 134                                 $page = new WikiCategoryPage( $title );
 135                                 break;
 136                         default:
 137                                 $page = new WikiPage( $title );
 138                 }
 139
 140                 return $page;
 141         }
 142
 143         /**
 144          * Constructor from a page id
 145          *
 146          * @param int $id Article ID to load
 147          * @param string|int $from One of the following values:
 148          *        - "fromdb" or WikiPage::READ_NORMAL to select from a replica DB
 149          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 150          *
 151          * @return WikiPage|null
 152          */
 153         public static function newFromID( $id, $from = 'fromdb' ) {
 154                 // page ids are never 0 or negative, see T63166
 155                 if ( $id < 1 ) {
 156                         return null;
 157                 }
 158
 159                 $from = self::convertSelectType( $from );
 160                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_REPLICA );
 161                 $pageQuery = self::getQueryInfo();
 162                 $row = $db->selectRow(
 163                         $pageQuery['tables'], $pageQuery['fields'], [ 'page_id' => $id ], __METHOD__,
 164                         [], $pageQuery['joins']
 165                 );
 166                 if ( !$row ) {
 167                         return null;
 168                 }
 169                 return self::newFromRow( $row, $from );
 170         }
 171
 172         /**
 173          * Constructor from a database row
 174          *
 175          * @since 1.20
 176          * @param object $row Database row containing at least fields returned by selectFields().
 177          * @param string|int $from Source of $data:
 178          *        - "fromdb" or WikiPage::READ_NORMAL: from a replica DB
 179          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 180          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 181          * @return WikiPage
 182          */
 183         public static function newFromRow( $row, $from = 'fromdb' ) {
 184                 $page = self::factory( Title::newFromRow( $row ) );
 185                 $page->loadFromRow( $row, $from );
 186                 return $page;
 187         }
 188
 189         /**
 190          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 191          *
 192          * @param object|string|int $type
 193          * @return mixed
 194          */
 195         private static function convertSelectType( $type ) {
 196                 switch ( $type ) {
 197                 case 'fromdb':
 198                         return self::READ_NORMAL;
 199                 case 'fromdbmaster':
 200                         return self::READ_LATEST;
 201                 case 'forupdate':
 202                         return self::READ_LOCKING;
 203                 default:
 204                         // It may already be an integer or whatever else
 205                         return $type;
 206                 }
 207         }
 208
 209         /**
 210          * @todo Move this UI stuff somewhere else
 211          *
 212          * @see ContentHandler::getActionOverrides
 213          * @return array
 214          */
 215         public function getActionOverrides() {
 216                 return $this->getContentHandler()->getActionOverrides();
 217         }
 218
 219         /**
 220          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 221          *
 222          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 223          *
 224          * @return ContentHandler
 225          *
 226          * @since 1.21
 227          */
 228         public function getContentHandler() {
 229                 return ContentHandler::getForModelID( $this->getContentModel() );
 230         }
 231
 232         /**
 233          * Get the title object of the article
 234          * @return Title Title object of this page
 235          */
 236         public function getTitle() {
 237                 return $this->mTitle;
 238         }
 239
 240         /**
 241          * Clear the object
 242          * @return void
 243          */
 244         public function clear() {
 245                 $this->mDataLoaded = false;
 246                 $this->mDataLoadedFrom = self::READ_NONE;
 247
 248                 $this->clearCacheFields();
 249         }
 250
 251         /**
 252          * Clear the object cache fields
 253          * @return void
 254          */
 255         protected function clearCacheFields() {
 256                 $this->mId = null;
 257                 $this->mRedirectTarget = null; // Title object if set
 258                 $this->mLastRevision = null; // Latest revision
 259                 $this->mTouched = '19700101000000';
 260                 $this->mLinksUpdated = '19700101000000';
 261                 $this->mTimestamp = '';
 262                 $this->mIsRedirect = false;
 263                 $this->mLatest = false;
 264                 // T59026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 265                 // the requested rev ID and content against the cached one for equality. For most
 266                 // content types, the output should not change during the lifetime of this cache.
 267                 // Clearing it can cause extra parses on edit for no reason.
 268         }
 269
 270         /**
 271          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 272          * @return void
 273          * @since 1.23
 274          */
 275         public function clearPreparedEdit() {
 276                 $this->mPreparedEdit = false;
 277         }
 278
 279         /**
 280          * Return the list of revision fields that should be selected to create
 281          * a new page.
 282          *
 283          * @deprecated since 1.31, use self::getQueryInfo() instead.
 284          * @return array
 285          */
 286         public static function selectFields() {
 287                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 288
 289                 wfDeprecated( __METHOD__, '1.31' );
 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 $fields;
 314         }
 315
 316         /**
 317          * Return the tables, fields, and join conditions to be selected to create
 318          * a new page object.
 319          * @since 1.31
 320          * @return array With three keys:
 321          *   - tables: (string[]) to include in the `$table` to `IDatabase->select()`
 322          *   - fields: (string[]) to include in the `$vars` to `IDatabase->select()`
 323          *   - joins: (array) to include in the `$join_conds` to `IDatabase->select()`
 324          */
 325         public static function getQueryInfo() {
 326                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 327
 328                 $ret = [
 329                         'tables' => [ 'page' ],
 330                         'fields' => [
 331                                 'page_id',
 332                                 'page_namespace',
 333                                 'page_title',
 334                                 'page_restrictions',
 335                                 'page_is_redirect',
 336                                 'page_is_new',
 337                                 'page_random',
 338                                 'page_touched',
 339                                 'page_links_updated',
 340                                 'page_latest',
 341                                 'page_len',
 342                         ],
 343                         'joins' => [],
 344                 ];
 345
 346                 if ( $wgContentHandlerUseDB ) {
 347                         $ret['fields'][] = 'page_content_model';
 348                 }
 349
 350                 if ( $wgPageLanguageUseDB ) {
 351                         $ret['fields'][] = 'page_lang';
 352                 }
 353
 354                 return $ret;
 355         }
 356
 357         /**
 358          * Fetch a page record with the given conditions
 359          * @param IDatabase $dbr
 360          * @param array $conditions
 361          * @param array $options
 362          * @return object|bool Database result resource, or false on failure
 363          */
 364         protected function pageData( $dbr, $conditions, $options = [] ) {
 365                 $pageQuery = self::getQueryInfo();
 366
 367                 // Avoid PHP 7.1 warning of passing $this by reference
 368                 $wikiPage = $this;
 369
 370                 Hooks::run( 'ArticlePageDataBefore', [
 371                         &$wikiPage, &$pageQuery['fields'], &$pageQuery['tables'], &$pageQuery['joins']
 372                 ] );
 373
 374                 $row = $dbr->selectRow(
 375                         $pageQuery['tables'],
 376                         $pageQuery['fields'],
 377                         $conditions,
 378                         __METHOD__,
 379                         $options,
 380                         $pageQuery['joins']
 381                 );
 382
 383                 Hooks::run( 'ArticlePageDataAfter', [ &$wikiPage, &$row ] );
 384
 385                 return $row;
 386         }
 387
 388         /**
 389          * Fetch a page record matching the Title object's namespace and title
 390          * using a sanitized title string
 391          *
 392          * @param IDatabase $dbr
 393          * @param Title $title
 394          * @param array $options
 395          * @return object|bool Database result resource, or false on failure
 396          */
 397         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
 398                 return $this->pageData( $dbr, [
 399                         'page_namespace' => $title->getNamespace(),
 400                         'page_title' => $title->getDBkey() ], $options );
 401         }
 402
 403         /**
 404          * Fetch a page record matching the requested ID
 405          *
 406          * @param IDatabase $dbr
 407          * @param int $id
 408          * @param array $options
 409          * @return object|bool Database result resource, or false on failure
 410          */
 411         public function pageDataFromId( $dbr, $id, $options = [] ) {
 412                 return $this->pageData( $dbr, [ 'page_id' => $id ], $options );
 413         }
 414
 415         /**
 416          * Load the object from a given source by title
 417          *
 418          * @param object|string|int $from One of the following:
 419          *   - A DB query result object.
 420          *   - "fromdb" or WikiPage::READ_NORMAL to get from a replica DB.
 421          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 422          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 423          *     using SELECT FOR UPDATE.
 424          *
 425          * @return void
 426          */
 427         public function loadPageData( $from = 'fromdb' ) {
 428                 $from = self::convertSelectType( $from );
 429                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 430                         // We already have the data from the correct location, no need to load it twice.
 431                         return;
 432                 }
 433
 434                 if ( is_int( $from ) ) {
 435                         list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 436                         $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 437                         $loadBalancer = MediaWikiServices::getInstance()->getDBLoadBalancer();
 438
 439                         if ( !$data
 440                                 && $index == DB_REPLICA
 441                                 && $loadBalancer->getServerCount() > 1
 442                                 && $loadBalancer->hasOrMadeRecentMasterChanges()
 443                         ) {
 444                                 $from = self::READ_LATEST;
 445                                 list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 446                                 $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 447                         }
 448                 } else {
 449                         // No idea from where the caller got this data, assume replica DB.
 450                         $data = $from;
 451                         $from = self::READ_NORMAL;
 452                 }
 453
 454                 $this->loadFromRow( $data, $from );
 455         }
 456
 457         /**
 458          * Load the object from a database row
 459          *
 460          * @since 1.20
 461          * @param object|bool $data DB row containing fields returned by selectFields() or false
 462          * @param string|int $from One of the following:
 463          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a replica DB
 464          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 465          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 466          *          the master DB using SELECT FOR UPDATE
 467          */
 468         public function loadFromRow( $data, $from ) {
 469                 $lc = LinkCache::singleton();
 470                 $lc->clearLink( $this->mTitle );
 471
 472                 if ( $data ) {
 473                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 474
 475                         $this->mTitle->loadFromRow( $data );
 476
 477                         // Old-fashioned restrictions
 478                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 479
 480                         $this->mId = intval( $data->page_id );
 481                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 482                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 483                         $this->mIsRedirect = intval( $data->page_is_redirect );
 484                         $this->mLatest = intval( $data->page_latest );
 485                         // T39225: $latest may no longer match the cached latest Revision object.
 486                         // Double-check the ID of any cached latest Revision object for consistency.
 487                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 488                                 $this->mLastRevision = null;
 489                                 $this->mTimestamp = '';
 490                         }
 491                 } else {
 492                         $lc->addBadLinkObj( $this->mTitle );
 493
 494                         $this->mTitle->loadFromRow( false );
 495
 496                         $this->clearCacheFields();
 497
 498                         $this->mId = 0;
 499                 }
 500
 501                 $this->mDataLoaded = true;
 502                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 503         }
 504
 505         /**
 506          * @return int Page ID
 507          */
 508         public function getId() {
 509                 if ( !$this->mDataLoaded ) {
 510                         $this->loadPageData();
 511                 }
 512                 return $this->mId;
 513         }
 514
 515         /**
 516          * @return bool Whether or not the page exists in the database
 517          */
 518         public function exists() {
 519                 if ( !$this->mDataLoaded ) {
 520                         $this->loadPageData();
 521                 }
 522                 return $this->mId > 0;
 523         }
 524
 525         /**
 526          * Check if this page is something we're going to be showing
 527          * some sort of sensible content for. If we return false, page
 528          * views (plain action=view) will return an HTTP 404 response,
 529          * so spiders and robots can know they're following a bad link.
 530          *
 531          * @return bool
 532          */
 533         public function hasViewableContent() {
 534                 return $this->mTitle->isKnown();
 535         }
 536
 537         /**
 538          * Tests if the article content represents a redirect
 539          *
 540          * @return bool
 541          */
 542         public function isRedirect() {
 543                 if ( !$this->mDataLoaded ) {
 544                         $this->loadPageData();
 545                 }
 546
 547                 return (bool)$this->mIsRedirect;
 548         }
 549
 550         /**
 551          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 552          *
 553          * Will use the revisions actual content model if the page exists,
 554          * and the page's default if the page doesn't exist yet.
 555          *
 556          * @return string
 557          *
 558          * @since 1.21
 559          */
 560         public function getContentModel() {
 561                 if ( $this->exists() ) {
 562                         $cache = ObjectCache::getMainWANInstance();
 563
 564                         return $cache->getWithSetCallback(
 565                                 $cache->makeKey( 'page-content-model', $this->getLatest() ),
 566                                 $cache::TTL_MONTH,
 567                                 function () {
 568                                         $rev = $this->getRevision();
 569                                         if ( $rev ) {
 570                                                 // Look at the revision's actual content model
 571                                                 return $rev->getContentModel();
 572                                         } else {
 573                                                 $title = $this->mTitle->getPrefixedDBkey();
 574                                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 575                                                 return $this->mTitle->getContentModel();
 576                                         }
 577                                 }
 578                         );
 579                 }
 580
 581                 // use the default model for this page
 582                 return $this->mTitle->getContentModel();
 583         }
 584
 585         /**
 586          * Loads page_touched and returns a value indicating if it should be used
 587          * @return bool True if this page exists and is not a redirect
 588          */
 589         public function checkTouched() {
 590                 if ( !$this->mDataLoaded ) {
 591                         $this->loadPageData();
 592                 }
 593                 return ( $this->mId && !$this->mIsRedirect );
 594         }
 595
 596         /**
 597          * Get the page_touched field
 598          * @return string Containing GMT timestamp
 599          */
 600         public function getTouched() {
 601                 if ( !$this->mDataLoaded ) {
 602                         $this->loadPageData();
 603                 }
 604                 return $this->mTouched;
 605         }
 606
 607         /**
 608          * Get the page_links_updated field
 609          * @return string|null Containing GMT timestamp
 610          */
 611         public function getLinksTimestamp() {
 612                 if ( !$this->mDataLoaded ) {
 613                         $this->loadPageData();
 614                 }
 615                 return $this->mLinksUpdated;
 616         }
 617
 618         /**
 619          * Get the page_latest field
 620          * @return int The rev_id of current revision
 621          */
 622         public function getLatest() {
 623                 if ( !$this->mDataLoaded ) {
 624                         $this->loadPageData();
 625                 }
 626                 return (int)$this->mLatest;
 627         }
 628
 629         /**
 630          * Get the Revision object of the oldest revision
 631          * @return Revision|null
 632          */
 633         public function getOldestRevision() {
 634                 // Try using the replica DB first, then try the master
 635                 $rev = $this->mTitle->getFirstRevision();
 636                 if ( !$rev ) {
 637                         $rev = $this->mTitle->getFirstRevision( Title::GAID_FOR_UPDATE );
 638                 }
 639                 return $rev;
 640         }
 641
 642         /**
 643          * Loads everything except the text
 644          * This isn't necessary for all uses, so it's only done if needed.
 645          */
 646         protected function loadLastEdit() {
 647                 if ( $this->mLastRevision !== null ) {
 648                         return; // already loaded
 649                 }
 650
 651                 $latest = $this->getLatest();
 652                 if ( !$latest ) {
 653                         return; // page doesn't exist or is missing page_latest info
 654                 }
 655
 656                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 657                         // T39225: if session S1 loads the page row FOR UPDATE, the result always
 658                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 659                         // transactions, where S1 normally only sees changes committed before the first S1
 660                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 661                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 662                         // happened after the first S1 SELECT.
 663                         // https://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
 664                         $flags = Revision::READ_LOCKING;
 665                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 666                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 667                         // Bug T93976: if page_latest was loaded from the master, fetch the
 668                         // revision from there as well, as it may not exist yet on a replica DB.
 669                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 670                         $flags = Revision::READ_LATEST;
 671                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 672                 } else {
 673                         $dbr = wfGetDB( DB_REPLICA );
 674                         $revision = Revision::newKnownCurrent( $dbr, $this->getId(), $latest );
 675                 }
 676
 677                 if ( $revision ) { // sanity
 678                         $this->setLastEdit( $revision );
 679                 }
 680         }
 681
 682         /**
 683          * Set the latest revision
 684          * @param Revision $revision
 685          */
 686         protected function setLastEdit( Revision $revision ) {
 687                 $this->mLastRevision = $revision;
 688                 $this->mTimestamp = $revision->getTimestamp();
 689         }
 690
 691         /**
 692          * Get the latest revision
 693          * @return Revision|null
 694          */
 695         public function getRevision() {
 696                 $this->loadLastEdit();
 697                 if ( $this->mLastRevision ) {
 698                         return $this->mLastRevision;
 699                 }
 700                 return null;
 701         }
 702
 703         /**
 704          * Get the content of the current revision. No side-effects...
 705          *
 706          * @param int $audience One of:
 707          *   Revision::FOR_PUBLIC       to be displayed to all users
 708          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 709          *   Revision::RAW              get the text regardless of permissions
 710          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 711          *   to the $audience parameter
 712          * @return Content|null The content of the current revision
 713          *
 714          * @since 1.21
 715          */
 716         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 717                 $this->loadLastEdit();
 718                 if ( $this->mLastRevision ) {
 719                         return $this->mLastRevision->getContent( $audience, $user );
 720                 }
 721                 return null;
 722         }
 723
 724         /**
 725          * @return string MW timestamp of last article revision
 726          */
 727         public function getTimestamp() {
 728                 // Check if the field has been filled by WikiPage::setTimestamp()
 729                 if ( !$this->mTimestamp ) {
 730                         $this->loadLastEdit();
 731                 }
 732
 733                 return wfTimestamp( TS_MW, $this->mTimestamp );
 734         }
 735
 736         /**
 737          * Set the page timestamp (use only to avoid DB queries)
 738          * @param string $ts MW timestamp of last article revision
 739          * @return void
 740          */
 741         public function setTimestamp( $ts ) {
 742                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 743         }
 744
 745         /**
 746          * @param int $audience One of:
 747          *   Revision::FOR_PUBLIC       to be displayed to all users
 748          *   Revision::FOR_THIS_USER    to be displayed to the given user
 749          *   Revision::RAW              get the text regardless of permissions
 750          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 751          *   to the $audience parameter
 752          * @return int User ID for the user that made the last article revision
 753          */
 754         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 755                 $this->loadLastEdit();
 756                 if ( $this->mLastRevision ) {
 757                         return $this->mLastRevision->getUser( $audience, $user );
 758                 } else {
 759                         return -1;
 760                 }
 761         }
 762
 763         /**
 764          * Get the User object of the user who created the page
 765          * @param int $audience One of:
 766          *   Revision::FOR_PUBLIC       to be displayed to all users
 767          *   Revision::FOR_THIS_USER    to be displayed to the given user
 768          *   Revision::RAW              get the text regardless of permissions
 769          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 770          *   to the $audience parameter
 771          * @return User|null
 772          */
 773         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 774                 $revision = $this->getOldestRevision();
 775                 if ( $revision ) {
 776                         $userName = $revision->getUserText( $audience, $user );
 777                         return User::newFromName( $userName, false );
 778                 } else {
 779                         return null;
 780                 }
 781         }
 782
 783         /**
 784          * @param int $audience One of:
 785          *   Revision::FOR_PUBLIC       to be displayed to all users
 786          *   Revision::FOR_THIS_USER    to be displayed to the given user
 787          *   Revision::RAW              get the text regardless of permissions
 788          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 789          *   to the $audience parameter
 790          * @return string Username of the user that made the last article revision
 791          */
 792         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 793                 $this->loadLastEdit();
 794                 if ( $this->mLastRevision ) {
 795                         return $this->mLastRevision->getUserText( $audience, $user );
 796                 } else {
 797                         return '';
 798                 }
 799         }
 800
 801         /**
 802          * @param int $audience One of:
 803          *   Revision::FOR_PUBLIC       to be displayed to all users
 804          *   Revision::FOR_THIS_USER    to be displayed to the given user
 805          *   Revision::RAW              get the text regardless of permissions
 806          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 807          *   to the $audience parameter
 808          * @return string Comment stored for the last article revision
 809          */
 810         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 811                 $this->loadLastEdit();
 812                 if ( $this->mLastRevision ) {
 813                         return $this->mLastRevision->getComment( $audience, $user );
 814                 } else {
 815                         return '';
 816                 }
 817         }
 818
 819         /**
 820          * Returns true if last revision was marked as "minor edit"
 821          *
 822          * @return bool Minor edit indicator for the last article revision.
 823          */
 824         public function getMinorEdit() {
 825                 $this->loadLastEdit();
 826                 if ( $this->mLastRevision ) {
 827                         return $this->mLastRevision->isMinor();
 828                 } else {
 829                         return false;
 830                 }
 831         }
 832
 833         /**
 834          * Determine whether a page would be suitable for being counted as an
 835          * article in the site_stats table based on the title & its content
 836          *
 837          * @param PreparedEdit|bool $editInfo (false): object returned by prepareTextForEdit(),
 838          *   if false, the current database state will be used
 839          * @return bool
 840          */
 841         public function isCountable( $editInfo = false ) {
 842                 global $wgArticleCountMethod;
 843
 844                 if ( !$this->mTitle->isContentPage() ) {
 845                         return false;
 846                 }
 847
 848                 if ( $editInfo ) {
 849                         $content = $editInfo->pstContent;
 850                 } else {
 851                         $content = $this->getContent();
 852                 }
 853
 854                 if ( !$content || $content->isRedirect() ) {
 855                         return false;
 856                 }
 857
 858                 $hasLinks = null;
 859
 860                 if ( $wgArticleCountMethod === 'link' ) {
 861                         // nasty special case to avoid re-parsing to detect links
 862
 863                         if ( $editInfo ) {
 864                                 // ParserOutput::getLinks() is a 2D array of page links, so
 865                                 // to be really correct we would need to recurse in the array
 866                                 // but the main array should only have items in it if there are
 867                                 // links.
 868                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 869                         } else {
 870                                 $hasLinks = (bool)wfGetDB( DB_REPLICA )->selectField( 'pagelinks', 1,
 871                                         [ 'pl_from' => $this->getId() ], __METHOD__ );
 872                         }
 873                 }
 874
 875                 return $content->isCountable( $hasLinks );
 876         }
 877
 878         /**
 879          * If this page is a redirect, get its target
 880          *
 881          * The target will be fetched from the redirect table if possible.
 882          * If this page doesn't have an entry there, call insertRedirect()
 883          * @return Title|null Title object, or null if this page is not a redirect
 884          */
 885         public function getRedirectTarget() {
 886                 if ( !$this->mTitle->isRedirect() ) {
 887                         return null;
 888                 }
 889
 890                 if ( $this->mRedirectTarget !== null ) {
 891                         return $this->mRedirectTarget;
 892                 }
 893
 894                 // Query the redirect table
 895                 $dbr = wfGetDB( DB_REPLICA );
 896                 $row = $dbr->selectRow( 'redirect',
 897                         [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ],
 898                         [ 'rd_from' => $this->getId() ],
 899                         __METHOD__
 900                 );
 901
 902                 // rd_fragment and rd_interwiki were added later, populate them if empty
 903                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 904                         $this->mRedirectTarget = Title::makeTitle(
 905                                 $row->rd_namespace, $row->rd_title,
 906                                 $row->rd_fragment, $row->rd_interwiki
 907                         );
 908                         return $this->mRedirectTarget;
 909                 }
 910
 911                 // This page doesn't have an entry in the redirect table
 912                 $this->mRedirectTarget = $this->insertRedirect();
 913                 return $this->mRedirectTarget;
 914         }
 915
 916         /**
 917          * Insert an entry for this page into the redirect table if the content is a redirect
 918          *
 919          * The database update will be deferred via DeferredUpdates
 920          *
 921          * Don't call this function directly unless you know what you're doing.
 922          * @return Title|null Title object or null if not a redirect
 923          */
 924         public function insertRedirect() {
 925                 $content = $this->getContent();
 926                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 927                 if ( !$retval ) {
 928                         return null;
 929                 }
 930
 931                 // Update the DB post-send if the page has not cached since now
 932                 $latest = $this->getLatest();
 933                 DeferredUpdates::addCallableUpdate(
 934                         function () use ( $retval, $latest ) {
 935                                 $this->insertRedirectEntry( $retval, $latest );
 936                         },
 937                         DeferredUpdates::POSTSEND,
 938                         wfGetDB( DB_MASTER )
 939                 );
 940
 941                 return $retval;
 942         }
 943
 944         /**
 945          * Insert or update the redirect table entry for this page to indicate it redirects to $rt
 946          * @param Title $rt Redirect target
 947          * @param int|null $oldLatest Prior page_latest for check and set
 948          */
 949         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
 950                 $dbw = wfGetDB( DB_MASTER );
 951                 $dbw->startAtomic( __METHOD__ );
 952
 953                 if ( !$oldLatest || $oldLatest == $this->lockAndGetLatest() ) {
 954                         $dbw->upsert(
 955                                 'redirect',
 956                                 [
 957                                         'rd_from' => $this->getId(),
 958                                         'rd_namespace' => $rt->getNamespace(),
 959                                         'rd_title' => $rt->getDBkey(),
 960                                         'rd_fragment' => $rt->getFragment(),
 961                                         'rd_interwiki' => $rt->getInterwiki(),
 962                                 ],
 963                                 [ 'rd_from' ],
 964                                 [
 965                                         'rd_namespace' => $rt->getNamespace(),
 966                                         'rd_title' => $rt->getDBkey(),
 967                                         'rd_fragment' => $rt->getFragment(),
 968                                         'rd_interwiki' => $rt->getInterwiki(),
 969                                 ],
 970                                 __METHOD__
 971                         );
 972                 }
 973
 974                 $dbw->endAtomic( __METHOD__ );
 975         }
 976
 977         /**
 978          * Get the Title object or URL this page redirects to
 979          *
 980          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 981          */
 982         public function followRedirect() {
 983                 return $this->getRedirectURL( $this->getRedirectTarget() );
 984         }
 985
 986         /**
 987          * Get the Title object or URL to use for a redirect. We use Title
 988          * objects for same-wiki, non-special redirects and URLs for everything
 989          * else.
 990          * @param Title $rt Redirect target
 991          * @return bool|Title|string False, Title object of local target, or string with URL
 992          */
 993         public function getRedirectURL( $rt ) {
 994                 if ( !$rt ) {
 995                         return false;
 996                 }
 997
 998                 if ( $rt->isExternal() ) {
 999                         if ( $rt->isLocal() ) {
1000                                 // Offsite wikis need an HTTP redirect.
1001                                 // This can be hard to reverse and may produce loops,
1002                                 // so they may be disabled in the site configuration.
1003                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
1004                                 return $rt->getFullURL( [ 'rdfrom' => $source ] );
1005                         } else {
1006                                 // External pages without "local" bit set are not valid
1007                                 // redirect targets
1008                                 return false;
1009                         }
1010                 }
1011
1012                 if ( $rt->isSpecialPage() ) {
1013                         // Gotta handle redirects to special pages differently:
1014                         // Fill the HTTP response "Location" header and ignore the rest of the page we're on.
1015                         // Some pages are not valid targets.
1016                         if ( $rt->isValidRedirectTarget() ) {
1017                                 return $rt->getFullURL();
1018                         } else {
1019                                 return false;
1020                         }
1021                 }
1022
1023                 return $rt;
1024         }
1025
1026         /**
1027          * Get a list of users who have edited this article, not including the user who made
1028          * the most recent revision, which you can get from $article->getUser() if you want it
1029          * @return UserArrayFromResult
1030          */
1031         public function getContributors() {
1032                 // @todo FIXME: This is expensive; cache this info somewhere.
1033
1034                 $dbr = wfGetDB( DB_REPLICA );
1035
1036                 $tables = [ 'revision', 'user' ];
1037
1038                 $fields = [
1039                         'user_id' => 'rev_user',
1040                         'user_name' => 'rev_user_text',
1041                         'user_real_name' => 'MIN(user_real_name)',
1042                         'timestamp' => 'MAX(rev_timestamp)',
1043                 ];
1044
1045                 $conds = [ 'rev_page' => $this->getId() ];
1046
1047                 // The user who made the top revision gets credited as "this page was last edited by
1048                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1049                 $user = $this->getUser();
1050                 if ( $user ) {
1051                         $conds[] = "rev_user != $user";
1052                 } else {
1053                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1054                 }
1055
1056                 // Username hidden?
1057                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0";
1058
1059                 $jconds = [
1060                         'user' => [ 'LEFT JOIN', 'rev_user = user_id' ],
1061                 ];
1062
1063                 $options = [
1064                         'GROUP BY' => [ 'rev_user', 'rev_user_text' ],
1065                         'ORDER BY' => 'timestamp DESC',
1066                 ];
1067
1068                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1069                 return new UserArrayFromResult( $res );
1070         }
1071
1072         /**
1073          * Should the parser cache be used?
1074          *
1075          * @param ParserOptions $parserOptions ParserOptions to check
1076          * @param int $oldId
1077          * @return bool
1078          */
1079         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
1080                 return $parserOptions->getStubThreshold() == 0
1081                         && $this->exists()
1082                         && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
1083                         && $this->getContentHandler()->isParserCacheSupported();
1084         }
1085
1086         /**
1087          * Get a ParserOutput for the given ParserOptions and revision ID.
1088          *
1089          * The parser cache will be used if possible. Cache misses that result
1090          * in parser runs are debounced with PoolCounter.
1091          *
1092          * @since 1.19
1093          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1094          * @param null|int $oldid Revision ID to get the text from, passing null or 0 will
1095          *   get the current revision (default value)
1096          * @param bool $forceParse Force reindexing, regardless of cache settings
1097          * @return bool|ParserOutput ParserOutput or false if the revision was not found
1098          */
1099         public function getParserOutput(
1100                 ParserOptions $parserOptions, $oldid = null, $forceParse = false
1101         ) {
1102                 $useParserCache =
1103                         ( !$forceParse ) && $this->shouldCheckParserCache( $parserOptions, $oldid );
1104
1105                 if ( $useParserCache && !$parserOptions->isSafeToCache() ) {
1106                         throw new InvalidArgumentException(
1107                                 'The supplied ParserOptions are not safe to cache. Fix the options or set $forceParse = true.'
1108                         );
1109                 }
1110
1111                 wfDebug( __METHOD__ .
1112                         ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1113                 if ( $parserOptions->getStubThreshold() ) {
1114                         wfIncrStats( 'pcache.miss.stub' );
1115                 }
1116
1117                 if ( $useParserCache ) {
1118                         $parserOutput = MediaWikiServices::getInstance()->getParserCache()
1119                                 ->get( $this, $parserOptions );
1120                         if ( $parserOutput !== false ) {
1121                                 return $parserOutput;
1122                         }
1123                 }
1124
1125                 if ( $oldid === null || $oldid === 0 ) {
1126                         $oldid = $this->getLatest();
1127                 }
1128
1129                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1130                 $pool->execute();
1131
1132                 return $pool->getParserOutput();
1133         }
1134
1135         /**
1136          * Do standard deferred updates after page view (existing or missing page)
1137          * @param User $user The relevant user
1138          * @param int $oldid Revision id being viewed; if not given or 0, latest revision is assumed
1139          */
1140         public function doViewUpdates( User $user, $oldid = 0 ) {
1141                 if ( wfReadOnly() ) {
1142                         return;
1143                 }
1144
1145                 Hooks::run( 'PageViewUpdates', [ $this, $user ] );
1146                 // Update newtalk / watchlist notification status
1147                 try {
1148                         $user->clearNotification( $this->mTitle, $oldid );
1149                 } catch ( DBError $e ) {
1150                         // Avoid outage if the master is not reachable
1151                         MWExceptionHandler::logException( $e );
1152                 }
1153         }
1154
1155         /**
1156          * Perform the actions of a page purging
1157          * @return bool
1158          * @note In 1.28 (and only 1.28), this took a $flags parameter that
1159          *  controlled how much purging was done.
1160          */
1161         public function doPurge() {
1162                 // Avoid PHP 7.1 warning of passing $this by reference
1163                 $wikiPage = $this;
1164
1165                 if ( !Hooks::run( 'ArticlePurge', [ &$wikiPage ] ) ) {
1166                         return false;
1167                 }
1168
1169                 $this->mTitle->invalidateCache();
1170
1171                 // Clear file cache
1172                 HTMLFileCache::clearFileCache( $this->getTitle() );
1173                 // Send purge after above page_touched update was committed
1174                 DeferredUpdates::addUpdate(
1175                         new CdnCacheUpdate( $this->mTitle->getCdnUrls() ),
1176                         DeferredUpdates::PRESEND
1177                 );
1178
1179                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1180                         $messageCache = MessageCache::singleton();
1181                         $messageCache->updateMessageOverride( $this->mTitle, $this->getContent() );
1182                 }
1183
1184                 return true;
1185         }
1186
1187         /**
1188          * Insert a new empty page record for this article.
1189          * This *must* be followed up by creating a revision
1190          * and running $this->updateRevisionOn( ... );
1191          * or else the record will be left in a funky state.
1192          * Best if all done inside a transaction.
1193          *
1194          * @param IDatabase $dbw
1195          * @param int|null $pageId Custom page ID that will be used for the insert statement
1196          *
1197          * @return bool|int The newly created page_id key; false if the row was not
1198          *   inserted, e.g. because the title already existed or because the specified
1199          *   page ID is already in use.
1200          */
1201         public function insertOn( $dbw, $pageId = null ) {
1202                 $pageIdForInsert = $pageId ? [ 'page_id' => $pageId ] : [];
1203                 $dbw->insert(
1204                         'page',
1205                         [
1206                                 'page_namespace'    => $this->mTitle->getNamespace(),
1207                                 'page_title'        => $this->mTitle->getDBkey(),
1208                                 'page_restrictions' => '',
1209                                 'page_is_redirect'  => 0, // Will set this shortly...
1210                                 'page_is_new'       => 1,
1211                                 'page_random'       => wfRandom(),
1212                                 'page_touched'      => $dbw->timestamp(),
1213                                 'page_latest'       => 0, // Fill this in shortly...
1214                                 'page_len'          => 0, // Fill this in shortly...
1215                         ] + $pageIdForInsert,
1216                         __METHOD__,
1217                         'IGNORE'
1218                 );
1219
1220                 if ( $dbw->affectedRows() > 0 ) {
1221                         $newid = $pageId ? (int)$pageId : $dbw->insertId();
1222                         $this->mId = $newid;
1223                         $this->mTitle->resetArticleID( $newid );
1224
1225                         return $newid;
1226                 } else {
1227                         return false; // nothing changed
1228                 }
1229         }
1230
1231         /**
1232          * Update the page record to point to a newly saved revision.
1233          *
1234          * @param IDatabase $dbw
1235          * @param Revision $revision For ID number, and text used to set
1236          *   length and redirect status fields
1237          * @param int $lastRevision If given, will not overwrite the page field
1238          *   when different from the currently set value.
1239          *   Giving 0 indicates the new page flag should be set on.
1240          * @param bool $lastRevIsRedirect If given, will optimize adding and
1241          *   removing rows in redirect table.
1242          * @return bool Success; false if the page row was missing or page_latest changed
1243          */
1244         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1245                 $lastRevIsRedirect = null
1246         ) {
1247                 global $wgContentHandlerUseDB;
1248
1249                 // Assertion to try to catch T92046
1250                 if ( (int)$revision->getId() === 0 ) {
1251                         throw new InvalidArgumentException(
1252                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1253                         );
1254                 }
1255
1256                 $content = $revision->getContent();
1257                 $len = $content ? $content->getSize() : 0;
1258                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1259
1260                 $conditions = [ 'page_id' => $this->getId() ];
1261
1262                 if ( !is_null( $lastRevision ) ) {
1263                         // An extra check against threads stepping on each other
1264                         $conditions['page_latest'] = $lastRevision;
1265                 }
1266
1267                 $row = [ /* SET */
1268                         'page_latest'      => $revision->getId(),
1269                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1270                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1271                         'page_is_redirect' => $rt !== null ? 1 : 0,
1272                         'page_len'         => $len,
1273                 ];
1274
1275                 if ( $wgContentHandlerUseDB ) {
1276                         $row['page_content_model'] = $revision->getContentModel();
1277                 }
1278
1279                 $dbw->update( 'page',
1280                         $row,
1281                         $conditions,
1282                         __METHOD__ );
1283
1284                 $result = $dbw->affectedRows() > 0;
1285                 if ( $result ) {
1286                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1287                         $this->setLastEdit( $revision );
1288                         $this->mLatest = $revision->getId();
1289                         $this->mIsRedirect = (bool)$rt;
1290                         // Update the LinkCache.
1291                         LinkCache::singleton()->addGoodLinkObj(
1292                                 $this->getId(),
1293                                 $this->mTitle,
1294                                 $len,
1295                                 $this->mIsRedirect,
1296                                 $this->mLatest,
1297                                 $revision->getContentModel()
1298                         );
1299                 }
1300
1301                 return $result;
1302         }
1303
1304         /**
1305          * Add row to the redirect table if this is a redirect, remove otherwise.
1306          *
1307          * @param IDatabase $dbw
1308          * @param Title|null $redirectTitle Title object pointing to the redirect target,
1309          *   or NULL if this is not a redirect
1310          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1311          *   removing rows in redirect table.
1312          * @return bool True on success, false on failure
1313          * @private
1314          */
1315         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1316                 // Always update redirects (target link might have changed)
1317                 // Update/Insert if we don't know if the last revision was a redirect or not
1318                 // Delete if changing from redirect to non-redirect
1319                 $isRedirect = !is_null( $redirectTitle );
1320
1321                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1322                         return true;
1323                 }
1324
1325                 if ( $isRedirect ) {
1326                         $this->insertRedirectEntry( $redirectTitle );
1327                 } else {
1328                         // This is not a redirect, remove row from redirect table
1329                         $where = [ 'rd_from' => $this->getId() ];
1330                         $dbw->delete( 'redirect', $where, __METHOD__ );
1331                 }
1332
1333                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1334                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1335                 }
1336
1337                 return ( $dbw->affectedRows() != 0 );
1338         }
1339
1340         /**
1341          * If the given revision is newer than the currently set page_latest,
1342          * update the page record. Otherwise, do nothing.
1343          *
1344          * @deprecated since 1.24, use updateRevisionOn instead
1345          *
1346          * @param IDatabase $dbw
1347          * @param Revision $revision
1348          * @return bool
1349          */
1350         public function updateIfNewerOn( $dbw, $revision ) {
1351                 $row = $dbw->selectRow(
1352                         [ 'revision', 'page' ],
1353                         [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
1354                         [
1355                                 'page_id' => $this->getId(),
1356                                 'page_latest=rev_id' ],
1357                         __METHOD__ );
1358
1359                 if ( $row ) {
1360                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1361                                 return false;
1362                         }
1363                         $prev = $row->rev_id;
1364                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1365                 } else {
1366                         // No or missing previous revision; mark the page as new
1367                         $prev = 0;
1368                         $lastRevIsRedirect = null;
1369                 }
1370
1371                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1372
1373                 return $ret;
1374         }
1375
1376         /**
1377          * Get the content that needs to be saved in order to undo all revisions
1378          * between $undo and $undoafter. Revisions must belong to the same page,
1379          * must exist and must not be deleted
1380          * @param Revision $undo
1381          * @param Revision $undoafter Must be an earlier revision than $undo
1382          * @return Content|bool Content on success, false on failure
1383          * @since 1.21
1384          * Before we had the Content object, this was done in getUndoText
1385          */
1386         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1387                 $handler = $undo->getContentHandler();
1388                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1389         }
1390
1391         /**
1392          * Returns true if this page's content model supports sections.
1393          *
1394          * @return bool
1395          *
1396          * @todo The skin should check this and not offer section functionality if
1397          *   sections are not supported.
1398          * @todo The EditPage should check this and not offer section functionality
1399          *   if sections are not supported.
1400          */
1401         public function supportsSections() {
1402                 return $this->getContentHandler()->supportsSections();
1403         }
1404
1405         /**
1406          * @param string|int|null|bool $sectionId Section identifier as a number or string
1407          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1408          * or 'new' for a new section.
1409          * @param Content $sectionContent New content of the section.
1410          * @param string $sectionTitle New section's subject, only if $section is "new".
1411          * @param string $edittime Revision timestamp or null to use the current revision.
1412          *
1413          * @throws MWException
1414          * @return Content|null New complete article content, or null if error.
1415          *
1416          * @since 1.21
1417          * @deprecated since 1.24, use replaceSectionAtRev instead
1418          */
1419         public function replaceSectionContent(
1420                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
1421         ) {
1422                 $baseRevId = null;
1423                 if ( $edittime && $sectionId !== 'new' ) {
1424                         $dbr = wfGetDB( DB_REPLICA );
1425                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1426                         // Try the master if this thread may have just added it.
1427                         // This could be abstracted into a Revision method, but we don't want
1428                         // to encourage loading of revisions by timestamp.
1429                         if ( !$rev
1430                                 && wfGetLB()->getServerCount() > 1
1431                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1432                         ) {
1433                                 $dbw = wfGetDB( DB_MASTER );
1434                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1435                         }
1436                         if ( $rev ) {
1437                                 $baseRevId = $rev->getId();
1438                         }
1439                 }
1440
1441                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1442         }
1443
1444         /**
1445          * @param string|int|null|bool $sectionId Section identifier as a number or string
1446          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1447          * or 'new' for a new section.
1448          * @param Content $sectionContent New content of the section.
1449          * @param string $sectionTitle New section's subject, only if $section is "new".
1450          * @param int|null $baseRevId
1451          *
1452          * @throws MWException
1453          * @return Content|null New complete article content, or null if error.
1454          *
1455          * @since 1.24
1456          */
1457         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1458                 $sectionTitle = '', $baseRevId = null
1459         ) {
1460                 if ( strval( $sectionId ) === '' ) {
1461                         // Whole-page edit; let the whole text through
1462                         $newContent = $sectionContent;
1463                 } else {
1464                         if ( !$this->supportsSections() ) {
1465                                 throw new MWException( "sections not supported for content model " .
1466                                         $this->getContentHandler()->getModelID() );
1467                         }
1468
1469                         // T32711: always use current version when adding a new section
1470                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1471                                 $oldContent = $this->getContent();
1472                         } else {
1473                                 $rev = Revision::newFromId( $baseRevId );
1474                                 if ( !$rev ) {
1475                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1476                                                 $this->getId() . "; section: $sectionId)\n" );
1477                                         return null;
1478                                 }
1479
1480                                 $oldContent = $rev->getContent();
1481                         }
1482
1483                         if ( !$oldContent ) {
1484                                 wfDebug( __METHOD__ . ": no page text\n" );
1485                                 return null;
1486                         }
1487
1488                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1489                 }
1490
1491                 return $newContent;
1492         }
1493
1494         /**
1495          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1496          * @param int $flags
1497          * @return int Updated $flags
1498          */
1499         public function checkFlags( $flags ) {
1500                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1501                         if ( $this->exists() ) {
1502                                 $flags |= EDIT_UPDATE;
1503                         } else {
1504                                 $flags |= EDIT_NEW;
1505                         }
1506                 }
1507
1508                 return $flags;
1509         }
1510
1511         /**
1512          * Change an existing article or create a new article. Updates RC and all necessary caches,
1513          * optionally via the deferred update array.
1514          *
1515          * @param Content $content New content
1516          * @param string $summary Edit summary
1517          * @param int $flags Bitfield:
1518          *      EDIT_NEW
1519          *          Article is known or assumed to be non-existent, create a new one
1520          *      EDIT_UPDATE
1521          *          Article is known or assumed to be pre-existing, update it
1522          *      EDIT_MINOR
1523          *          Mark this edit minor, if the user is allowed to do so
1524          *      EDIT_SUPPRESS_RC
1525          *          Do not log the change in recentchanges
1526          *      EDIT_FORCE_BOT
1527          *          Mark the edit a "bot" edit regardless of user rights
1528          *      EDIT_AUTOSUMMARY
1529          *          Fill in blank summaries with generated text where possible
1530          *      EDIT_INTERNAL
1531          *          Signal that the page retrieve/save cycle happened entirely in this request.
1532          *
1533          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1534          * article will be detected. If EDIT_UPDATE is specified and the article
1535          * doesn't exist, the function will return an edit-gone-missing error. If
1536          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1537          * error will be returned. These two conditions are also possible with
1538          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1539          *
1540          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1541          *   This is not the parent revision ID, rather the revision ID for older
1542          *   content used as the source for a rollback, for example.
1543          * @param User $user The user doing the edit
1544          * @param string $serialFormat Format for storing the content in the
1545          *   database.
1546          * @param array|null $tags Change tags to apply to this edit
1547          * Callers are responsible for permission checks
1548          * (with ChangeTags::canAddTagsAccompanyingChange)
1549          * @param Int $undidRevId Id of revision that was undone or 0
1550          *
1551          * @throws MWException
1552          * @return Status Possible errors:
1553          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1554          *       set the fatal flag of $status.
1555          *     edit-gone-missing: In update mode, but the article didn't exist.
1556          *     edit-conflict: In update mode, the article changed unexpectedly.
1557          *     edit-no-change: Warning that the text was the same as before.
1558          *     edit-already-exists: In creation mode, but the article already exists.
1559          *
1560          *  Extensions may define additional errors.
1561          *
1562          *  $return->value will contain an associative array with members as follows:
1563          *     new: Boolean indicating if the function attempted to create a new article.
1564          *     revision: The revision object for the inserted revision, or null.
1565          *
1566          * @since 1.21
1567          * @throws MWException
1568          */
1569         public function doEditContent(
1570                 Content $content, $summary, $flags = 0, $baseRevId = false,
1571                 User $user = null, $serialFormat = null, $tags = [], $undidRevId = 0
1572         ) {
1573                 global $wgUser, $wgUseAutomaticEditSummaries;
1574
1575                 // Old default parameter for $tags was null
1576                 if ( $tags === null ) {
1577                         $tags = [];
1578                 }
1579
1580                 // Low-level sanity check
1581                 if ( $this->mTitle->getText() === '' ) {
1582                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1583                 }
1584                 // Make sure the given content type is allowed for this page
1585                 if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
1586                         return Status::newFatal( 'content-not-allowed-here',
1587                                 ContentHandler::getLocalizedName( $content->getModel() ),
1588                                 $this->mTitle->getPrefixedText()
1589                         );
1590                 }
1591
1592                 // Load the data from the master database if needed.
1593                 // The caller may already loaded it from the master or even loaded it using
1594                 // SELECT FOR UPDATE, so do not override that using clear().
1595                 $this->loadPageData( 'fromdbmaster' );
1596
1597                 $user = $user ?: $wgUser;
1598                 $flags = $this->checkFlags( $flags );
1599
1600                 // Avoid PHP 7.1 warning of passing $this by reference
1601                 $wikiPage = $this;
1602
1603                 // Trigger pre-save hook (using provided edit summary)
1604                 $hookStatus = Status::newGood( [] );
1605                 $hook_args = [ &$wikiPage, &$user, &$content, &$summary,
1606                                                         $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
1607                 // Check if the hook rejected the attempted save
1608                 if ( !Hooks::run( 'PageContentSave', $hook_args ) ) {
1609                         if ( $hookStatus->isOK() ) {
1610                                 // Hook returned false but didn't call fatal(); use generic message
1611                                 $hookStatus->fatal( 'edit-hook-aborted' );
1612                         }
1613
1614                         return $hookStatus;
1615                 }
1616
1617                 $old_revision = $this->getRevision(); // current revision
1618                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1619
1620                 $handler = $content->getContentHandler();
1621                 $tag = $handler->getChangeTag( $old_content, $content, $flags );
1622                 // If there is no applicable tag, null is returned, so we need to check
1623                 if ( $tag ) {
1624                         $tags[] = $tag;
1625                 }
1626
1627                 // Provide autosummaries if summary is not provided and autosummaries are enabled
1628                 if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
1629                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1630                 }
1631
1632                 // Avoid statsd noise and wasted cycles check the edit stash (T136678)
1633                 if ( ( $flags & EDIT_INTERNAL ) || ( $flags & EDIT_FORCE_BOT ) ) {
1634                         $useCache = false;
1635                 } else {
1636                         $useCache = true;
1637                 }
1638
1639                 // Get the pre-save transform content and final parser output
1640                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat, $useCache );
1641                 $pstContent = $editInfo->pstContent; // Content object
1642                 $meta = [
1643                         'bot' => ( $flags & EDIT_FORCE_BOT ),
1644                         'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
1645                         'serialized' => $pstContent->serialize( $serialFormat ),
1646                         'serialFormat' => $serialFormat,
1647                         'baseRevId' => $baseRevId,
1648                         'oldRevision' => $old_revision,
1649                         'oldContent' => $old_content,
1650                         'oldId' => $this->getLatest(),
1651                         'oldIsRedirect' => $this->isRedirect(),
1652                         'oldCountable' => $this->isCountable(),
1653                         'tags' => ( $tags !== null ) ? (array)$tags : [],
1654                         'undidRevId' => $undidRevId
1655                 ];
1656
1657                 // Actually create the revision and create/update the page
1658                 if ( $flags & EDIT_UPDATE ) {
1659                         $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
1660                 } else {
1661                         $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
1662                 }
1663
1664                 // Promote user to any groups they meet the criteria for
1665                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1666                         $user->addAutopromoteOnceGroups( 'onEdit' );
1667                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1668                 } );
1669
1670                 return $status;
1671         }
1672
1673         /**
1674          * @param Content $content Pre-save transform content
1675          * @param int $flags
1676          * @param User $user
1677          * @param string $summary
1678          * @param array $meta
1679          * @return Status
1680          * @throws DBUnexpectedError
1681          * @throws Exception
1682          * @throws FatalError
1683          * @throws MWException
1684          */
1685         private function doModify(
1686                 Content $content, $flags, User $user, $summary, array $meta
1687         ) {
1688                 global $wgUseRCPatrol;
1689
1690                 // Update article, but only if changed.
1691                 $status = Status::newGood( [ 'new' => false, 'revision' => null ] );
1692
1693                 // Convenience variables
1694                 $now = wfTimestampNow();
1695                 $oldid = $meta['oldId'];
1696                 /** @var Content|null $oldContent */
1697                 $oldContent = $meta['oldContent'];
1698                 $newsize = $content->getSize();
1699
1700                 if ( !$oldid ) {
1701                         // Article gone missing
1702                         $status->fatal( 'edit-gone-missing' );
1703
1704                         return $status;
1705                 } elseif ( !$oldContent ) {
1706                         // Sanity check for T39225
1707                         throw new MWException( "Could not find text for current revision {$oldid}." );
1708                 }
1709
1710                 $changed = !$content->equals( $oldContent );
1711
1712                 $dbw = wfGetDB( DB_MASTER );
1713
1714                 if ( $changed ) {
1715                         // @TODO: pass content object?!
1716                         $revision = new Revision( [
1717                                 'page'       => $this->getId(),
1718                                 'title'      => $this->mTitle, // for determining the default content model
1719                                 'comment'    => $summary,
1720                                 'minor_edit' => $meta['minor'],
1721                                 'text'       => $meta['serialized'],
1722                                 'len'        => $newsize,
1723                                 'parent_id'  => $oldid,
1724                                 'user'       => $user->getId(),
1725                                 'user_text'  => $user->getName(),
1726                                 'timestamp'  => $now,
1727                                 'content_model' => $content->getModel(),
1728                                 'content_format' => $meta['serialFormat'],
1729                         ] );
1730
1731                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1732                         $status->merge( $prepStatus );
1733                         if ( !$status->isOK() ) {
1734                                 return $status;
1735                         }
1736
1737                         $dbw->startAtomic( __METHOD__ );
1738                         // Get the latest page_latest value while locking it.
1739                         // Do a CAS style check to see if it's the same as when this method
1740                         // started. If it changed then bail out before touching the DB.
1741                         $latestNow = $this->lockAndGetLatest();
1742                         if ( $latestNow != $oldid ) {
1743                                 $dbw->endAtomic( __METHOD__ );
1744                                 // Page updated or deleted in the mean time
1745                                 $status->fatal( 'edit-conflict' );
1746
1747                                 return $status;
1748                         }
1749
1750                         // At this point we are now comitted to returning an OK
1751                         // status unless some DB query error or other exception comes up.
1752                         // This way callers don't have to call rollback() if $status is bad
1753                         // unless they actually try to catch exceptions (which is rare).
1754
1755                         // Save the revision text
1756                         $revisionId = $revision->insertOn( $dbw );
1757                         // Update page_latest and friends to reflect the new revision
1758                         if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
1759                                 throw new MWException( "Failed to update page row to use new revision." );
1760                         }
1761
1762                         Hooks::run( 'NewRevisionFromEditComplete',
1763                                 [ $this, $revision, $meta['baseRevId'], $user ] );
1764
1765                         // Update recentchanges
1766                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1767                                 // Mark as patrolled if the user can do so
1768                                 $patrolled = $wgUseRCPatrol && !count(
1769                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1770                                 // Add RC row to the DB
1771                                 RecentChange::notifyEdit(
1772                                         $now,
1773                                         $this->mTitle,
1774                                         $revision->isMinor(),
1775                                         $user,
1776                                         $summary,
1777                                         $oldid,
1778                                         $this->getTimestamp(),
1779                                         $meta['bot'],
1780                                         '',
1781                                         $oldContent ? $oldContent->getSize() : 0,
1782                                         $newsize,
1783                                         $revisionId,
1784                                         $patrolled,
1785                                         $meta['tags']
1786                                 );
1787                         }
1788
1789                         $user->incEditCount();
1790
1791                         $dbw->endAtomic( __METHOD__ );
1792                         $this->mTimestamp = $now;
1793                 } else {
1794                         // T34948: revision ID must be set to page {{REVISIONID}} and
1795                         // related variables correctly. Likewise for {{REVISIONUSER}} (T135261).
1796                         // Since we don't insert a new revision into the database, the least
1797                         // error-prone way is to reuse given old revision.
1798                         $revision = $meta['oldRevision'];
1799                 }
1800
1801                 if ( $changed ) {
1802                         // Return the new revision to the caller
1803                         $status->value['revision'] = $revision;
1804                 } else {
1805                         $status->warning( 'edit-no-change' );
1806                         // Update page_touched as updateRevisionOn() was not called.
1807                         // Other cache updates are managed in onArticleEdit() via doEditUpdates().
1808                         $this->mTitle->invalidateCache( $now );
1809                 }
1810
1811                 // Do secondary updates once the main changes have been committed...
1812                 DeferredUpdates::addUpdate(
1813                         new AtomicSectionUpdate(
1814                                 $dbw,
1815                                 __METHOD__,
1816                                 function () use (
1817                                         $revision, &$user, $content, $summary, &$flags,
1818                                         $changed, $meta, &$status
1819                                 ) {
1820                                         // Update links tables, site stats, etc.
1821                                         $this->doEditUpdates(
1822                                                 $revision,
1823                                                 $user,
1824                                                 [
1825                                                         'changed' => $changed,
1826                                                         'oldcountable' => $meta['oldCountable'],
1827                                                         'oldrevision' => $meta['oldRevision']
1828                                                 ]
1829                                         );
1830                                         // Avoid PHP 7.1 warning of passing $this by reference
1831                                         $wikiPage = $this;
1832                                         // Trigger post-save hook
1833                                         $params = [ &$wikiPage, &$user, $content, $summary, $flags & EDIT_MINOR,
1834                                                 null, null, &$flags, $revision, &$status, $meta['baseRevId'],
1835                                                 $meta['undidRevId'] ];
1836                                         Hooks::run( 'PageContentSaveComplete', $params );
1837                                 }
1838                         ),
1839                         DeferredUpdates::PRESEND
1840                 );
1841
1842                 return $status;
1843         }
1844
1845         /**
1846          * @param Content $content Pre-save transform content
1847          * @param int $flags
1848          * @param User $user
1849          * @param string $summary
1850          * @param array $meta
1851          * @return Status
1852          * @throws DBUnexpectedError
1853          * @throws Exception
1854          * @throws FatalError
1855          * @throws MWException
1856          */
1857         private function doCreate(
1858                 Content $content, $flags, User $user, $summary, array $meta
1859         ) {
1860                 global $wgUseRCPatrol, $wgUseNPPatrol;
1861
1862                 $status = Status::newGood( [ 'new' => true, 'revision' => null ] );
1863
1864                 $now = wfTimestampNow();
1865                 $newsize = $content->getSize();
1866                 $prepStatus = $content->prepareSave( $this, $flags, $meta['oldId'], $user );
1867                 $status->merge( $prepStatus );
1868                 if ( !$status->isOK() ) {
1869                         return $status;
1870                 }
1871
1872                 $dbw = wfGetDB( DB_MASTER );
1873                 $dbw->startAtomic( __METHOD__ );
1874
1875                 // Add the page record unless one already exists for the title
1876                 $newid = $this->insertOn( $dbw );
1877                 if ( $newid === false ) {
1878                         $dbw->endAtomic( __METHOD__ ); // nothing inserted
1879                         $status->fatal( 'edit-already-exists' );
1880
1881                         return $status; // nothing done
1882                 }
1883
1884                 // At this point we are now comitted to returning an OK
1885                 // status unless some DB query error or other exception comes up.
1886                 // This way callers don't have to call rollback() if $status is bad
1887                 // unless they actually try to catch exceptions (which is rare).
1888
1889                 // @TODO: pass content object?!
1890                 $revision = new Revision( [
1891                         'page'       => $newid,
1892                         'title'      => $this->mTitle, // for determining the default content model
1893                         'comment'    => $summary,
1894                         'minor_edit' => $meta['minor'],
1895                         'text'       => $meta['serialized'],
1896                         'len'        => $newsize,
1897                         'user'       => $user->getId(),
1898                         'user_text'  => $user->getName(),
1899                         'timestamp'  => $now,
1900                         'content_model' => $content->getModel(),
1901                         'content_format' => $meta['serialFormat'],
1902                 ] );
1903
1904                 // Save the revision text...
1905                 $revisionId = $revision->insertOn( $dbw );
1906                 // Update the page record with revision data
1907                 if ( !$this->updateRevisionOn( $dbw, $revision, 0 ) ) {
1908                         throw new MWException( "Failed to update page row to use new revision." );
1909                 }
1910
1911                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
1912
1913                 // Update recentchanges
1914                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1915                         // Mark as patrolled if the user can do so
1916                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) &&
1917                                 !count( $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1918                         // Add RC row to the DB
1919                         RecentChange::notifyNew(
1920                                 $now,
1921                                 $this->mTitle,
1922                                 $revision->isMinor(),
1923                                 $user,
1924                                 $summary,
1925                                 $meta['bot'],
1926                                 '',
1927                                 $newsize,
1928                                 $revisionId,
1929                                 $patrolled,
1930                                 $meta['tags']
1931                         );
1932                 }
1933
1934                 $user->incEditCount();
1935
1936                 $dbw->endAtomic( __METHOD__ );
1937                 $this->mTimestamp = $now;
1938
1939                 // Return the new revision to the caller
1940                 $status->value['revision'] = $revision;
1941
1942                 // Do secondary updates once the main changes have been committed...
1943                 DeferredUpdates::addUpdate(
1944                         new AtomicSectionUpdate(
1945                                 $dbw,
1946                                 __METHOD__,
1947                                 function () use (
1948                                         $revision, &$user, $content, $summary, &$flags, $meta, &$status
1949                                 ) {
1950                                         // Update links, etc.
1951                                         $this->doEditUpdates( $revision, $user, [ 'created' => true ] );
1952                                         // Avoid PHP 7.1 warning of passing $this by reference
1953                                         $wikiPage = $this;
1954                                         // Trigger post-create hook
1955                                         $params = [ &$wikiPage, &$user, $content, $summary,
1956                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ];
1957                                         Hooks::run( 'PageContentInsertComplete', $params );
1958                                         // Trigger post-save hook
1959                                         $params = array_merge( $params, [ &$status, $meta['baseRevId'], 0 ] );
1960                                         Hooks::run( 'PageContentSaveComplete', $params );
1961                                 }
1962                         ),
1963                         DeferredUpdates::PRESEND
1964                 );
1965
1966                 return $status;
1967         }
1968
1969         /**
1970          * Get parser options suitable for rendering the primary article wikitext
1971          *
1972          * @see ContentHandler::makeParserOptions
1973          *
1974          * @param IContextSource|User|string $context One of the following:
1975          *        - IContextSource: Use the User and the Language of the provided
1976          *          context
1977          *        - User: Use the provided User object and $wgLang for the language,
1978          *          so use an IContextSource object if possible.
1979          *        - 'canonical': Canonical options (anonymous user with default
1980          *          preferences and content language).
1981          * @return ParserOptions
1982          */
1983         public function makeParserOptions( $context ) {
1984                 $options = $this->getContentHandler()->makeParserOptions( $context );
1985
1986                 if ( $this->getTitle()->isConversionTable() ) {
1987                         // @todo ConversionTable should become a separate content model, so
1988                         // we don't need special cases like this one.
1989                         $options->disableContentConversion();
1990                 }
1991
1992                 return $options;
1993         }
1994
1995         /**
1996          * Prepare content which is about to be saved.
1997          *
1998          * Prior to 1.30, this returned a stdClass object with the same class
1999          * members.
2000          *
2001          * @param Content $content
2002          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
2003          *        revision ID is also accepted, but this is deprecated.
2004          * @param User|null $user
2005          * @param string|null $serialFormat
2006          * @param bool $useCache Check shared prepared edit cache
2007          *
2008          * @return PreparedEdit
2009          *
2010          * @since 1.21
2011          */
2012         public function prepareContentForEdit(
2013                 Content $content, $revision = null, User $user = null,
2014                 $serialFormat = null, $useCache = true
2015         ) {
2016                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2017
2018                 if ( is_object( $revision ) ) {
2019                         $revid = $revision->getId();
2020                 } else {
2021                         $revid = $revision;
2022                         // This code path is deprecated, and nothing is known to
2023                         // use it, so performance here shouldn't be a worry.
2024                         if ( $revid !== null ) {
2025                                 wfDeprecated( __METHOD__ . ' with $revision = revision ID', '1.25' );
2026                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2027                         } else {
2028                                 $revision = null;
2029                         }
2030                 }
2031
2032                 $user = is_null( $user ) ? $wgUser : $user;
2033                 // XXX: check $user->getId() here???
2034
2035                 // Use a sane default for $serialFormat, see T59026
2036                 if ( $serialFormat === null ) {
2037                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2038                 }
2039
2040                 if ( $this->mPreparedEdit
2041                         && isset( $this->mPreparedEdit->newContent )
2042                         && $this->mPreparedEdit->newContent->equals( $content )
2043                         && $this->mPreparedEdit->revid == $revid
2044                         && $this->mPreparedEdit->format == $serialFormat
2045                         // XXX: also check $user here?
2046                 ) {
2047                         // Already prepared
2048                         return $this->mPreparedEdit;
2049                 }
2050
2051                 // The edit may have already been prepared via api.php?action=stashedit
2052                 $cachedEdit = $useCache && $wgAjaxEditStash
2053                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2054                         : false;
2055
2056                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2057                 Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );
2058
2059                 $edit = new PreparedEdit();
2060                 if ( $cachedEdit ) {
2061                         $edit->timestamp = $cachedEdit->timestamp;
2062                 } else {
2063                         $edit->timestamp = wfTimestampNow();
2064                 }
2065                 // @note: $cachedEdit is safely not used if the rev ID was referenced in the text
2066                 $edit->revid = $revid;
2067
2068                 if ( $cachedEdit ) {
2069                         $edit->pstContent = $cachedEdit->pstContent;
2070                 } else {
2071                         $edit->pstContent = $content
2072                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2073                                 : null;
2074                 }
2075
2076                 $edit->format = $serialFormat;
2077                 $edit->popts = $this->makeParserOptions( 'canonical' );
2078                 if ( $cachedEdit ) {
2079                         $edit->output = $cachedEdit->output;
2080                 } else {
2081                         if ( $revision ) {
2082                                 // We get here if vary-revision is set. This means that this page references
2083                                 // itself (such as via self-transclusion). In this case, we need to make sure
2084                                 // that any such self-references refer to the newly-saved revision, and not
2085                                 // to the previous one, which could otherwise happen due to replica DB lag.
2086                                 $oldCallback = $edit->popts->getCurrentRevisionCallback();
2087                                 $edit->popts->setCurrentRevisionCallback(
2088                                         function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
2089                                                 if ( $title->equals( $revision->getTitle() ) ) {
2090                                                         return $revision;
2091                                                 } else {
2092                                                         return call_user_func( $oldCallback, $title, $parser );
2093                                                 }
2094                                         }
2095                                 );
2096                         } else {
2097                                 // Try to avoid a second parse if {{REVISIONID}} is used
2098                                 $dbIndex = ( $this->mDataLoadedFrom & self::READ_LATEST ) === self::READ_LATEST
2099                                         ? DB_MASTER // use the best possible guess
2100                                         : DB_REPLICA; // T154554
2101
2102                                 $edit->popts->setSpeculativeRevIdCallback( function () use ( $dbIndex ) {
2103                                         return 1 + (int)wfGetDB( $dbIndex )->selectField(
2104                                                 'revision',
2105                                                 'MAX(rev_id)',
2106                                                 [],
2107                                                 __METHOD__
2108                                         );
2109                                 } );
2110                         }
2111                         $edit->output = $edit->pstContent
2112                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2113                                 : null;
2114                 }
2115
2116                 $edit->newContent = $content;
2117                 $edit->oldContent = $this->getContent( Revision::RAW );
2118
2119                 // NOTE: B/C for hooks! don't use these fields!
2120                 $edit->newText = $edit->newContent
2121                         ? ContentHandler::getContentText( $edit->newContent )
2122                         : '';
2123                 $edit->oldText = $edit->oldContent
2124                         ? ContentHandler::getContentText( $edit->oldContent )
2125                         : '';
2126                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2127
2128                 if ( $edit->output ) {
2129                         $edit->output->setCacheTime( wfTimestampNow() );
2130                 }
2131
2132                 // Process cache the result
2133                 $this->mPreparedEdit = $edit;
2134
2135                 return $edit;
2136         }
2137
2138         /**
2139          * Do standard deferred updates after page edit.
2140          * Update links tables, site stats, search index and message cache.
2141          * Purges pages that include this page if the text was changed here.
2142          * Every 100th edit, prune the recent changes table.
2143          *
2144          * @param Revision $revision
2145          * @param User $user User object that did the revision
2146          * @param array $options Array of options, following indexes are used:
2147          * - changed: bool, whether the revision changed the content (default true)
2148          * - created: bool, whether the revision created the page (default false)
2149          * - moved: bool, whether the page was moved (default false)
2150          * - restored: bool, whether the page was undeleted (default false)
2151          * - oldrevision: Revision object for the pre-update revision (default null)
2152          * - oldcountable: bool, null, or string 'no-change' (default null):
2153          *   - bool: whether the page was counted as an article before that
2154          *     revision, only used in changed is true and created is false
2155          *   - null: if created is false, don't update the article count; if created
2156          *     is true, do update the article count
2157          *   - 'no-change': don't update the article count, ever
2158          */
2159         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2160                 global $wgRCWatchCategoryMembership;
2161
2162                 $options += [
2163                         'changed' => true,
2164                         'created' => false,
2165                         'moved' => false,
2166                         'restored' => false,
2167                         'oldrevision' => null,
2168                         'oldcountable' => null
2169                 ];
2170                 $content = $revision->getContent();
2171
2172                 $logger = LoggerFactory::getInstance( 'SaveParse' );
2173
2174                 // See if the parser output before $revision was inserted is still valid
2175                 $editInfo = false;
2176                 if ( !$this->mPreparedEdit ) {
2177                         $logger->debug( __METHOD__ . ": No prepared edit...\n" );
2178                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2179                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision...\n" );
2180                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision-id' )
2181                         && $this->mPreparedEdit->output->getSpeculativeRevIdUsed() !== $revision->getId()
2182                 ) {
2183                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision-id with wrong ID...\n" );
2184                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-user' ) && !$options['changed'] ) {
2185                         $logger->info( __METHOD__ . ": Prepared edit has vary-user and is null...\n" );
2186                 } else {
2187                         wfDebug( __METHOD__ . ": Using prepared edit...\n" );
2188                         $editInfo = $this->mPreparedEdit;
2189                 }
2190
2191                 if ( !$editInfo ) {
2192                         // Parse the text again if needed. Be careful not to do pre-save transform twice:
2193                         // $text is usually already pre-save transformed once. Avoid using the edit stash
2194                         // as any prepared content from there or in doEditContent() was already rejected.
2195                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user, null, false );
2196                 }
2197
2198                 // Save it to the parser cache.
2199                 // Make sure the cache time matches page_touched to avoid double parsing.
2200                 MediaWikiServices::getInstance()->getParserCache()->save(
2201                         $editInfo->output, $this, $editInfo->popts,
2202                         $revision->getTimestamp(), $editInfo->revid
2203                 );
2204
2205                 // Update the links tables and other secondary data
2206                 if ( $content ) {
2207                         $recursive = $options['changed']; // T52785
2208                         $updates = $content->getSecondaryDataUpdates(
2209                                 $this->getTitle(), null, $recursive, $editInfo->output
2210                         );
2211                         foreach ( $updates as $update ) {
2212                                 $update->setCause( 'edit-page', $user->getName() );
2213                                 if ( $update instanceof LinksUpdate ) {
2214                                         $update->setRevision( $revision );
2215                                         $update->setTriggeringUser( $user );
2216                                 }
2217                                 DeferredUpdates::addUpdate( $update );
2218                         }
2219                         if ( $wgRCWatchCategoryMembership
2220                                 && $this->getContentHandler()->supportsCategories() === true
2221                                 && ( $options['changed'] || $options['created'] )
2222                                 && !$options['restored']
2223                         ) {
2224                                 // Note: jobs are pushed after deferred updates, so the job should be able to see
2225                                 // the recent change entry (also done via deferred updates) and carry over any
2226                                 // bot/deletion/IP flags, ect.
2227                                 JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
2228                                         $this->getTitle(),
2229                                         [
2230                                                 'pageId' => $this->getId(),
2231                                                 'revTimestamp' => $revision->getTimestamp()
2232                                         ]
2233                                 ) );
2234                         }
2235                 }
2236
2237                 // Avoid PHP 7.1 warning of passing $this by reference
2238                 $wikiPage = $this;
2239
2240                 Hooks::run( 'ArticleEditUpdates', [ &$wikiPage, &$editInfo, $options['changed'] ] );
2241
2242                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$wikiPage ] ) ) {
2243                         // Flush old entries from the `recentchanges` table
2244                         if ( mt_rand( 0, 9 ) == 0 ) {
2245                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2246                         }
2247                 }
2248
2249                 if ( !$this->exists() ) {
2250                         return;
2251                 }
2252
2253                 $id = $this->getId();
2254                 $title = $this->mTitle->getPrefixedDBkey();
2255                 $shortTitle = $this->mTitle->getDBkey();
2256
2257                 if ( $options['oldcountable'] === 'no-change' ||
2258                         ( !$options['changed'] && !$options['moved'] )
2259                 ) {
2260                         $good = 0;
2261                 } elseif ( $options['created'] ) {
2262                         $good = (int)$this->isCountable( $editInfo );
2263                 } elseif ( $options['oldcountable'] !== null ) {
2264                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2265                 } else {
2266                         $good = 0;
2267                 }
2268                 $edits = $options['changed'] ? 1 : 0;
2269                 $total = $options['created'] ? 1 : 0;
2270
2271                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2272                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2273
2274                 // If this is another user's talk page, update newtalk.
2275                 // Don't do this if $options['changed'] = false (null-edits) nor if
2276                 // it's a minor edit and the user doesn't want notifications for those.
2277                 if ( $options['changed']
2278                         && $this->mTitle->getNamespace() == NS_USER_TALK
2279                         && $shortTitle != $user->getTitleKey()
2280                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2281                 ) {
2282                         $recipient = User::newFromName( $shortTitle, false );
2283                         if ( !$recipient ) {
2284                                 wfDebug( __METHOD__ . ": invalid username\n" );
2285                         } else {
2286                                 // Avoid PHP 7.1 warning of passing $this by reference
2287                                 $wikiPage = $this;
2288
2289                                 // Allow extensions to prevent user notification
2290                                 // when a new message is added to their talk page
2291                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$wikiPage, $recipient ] ) ) {
2292                                         if ( User::isIP( $shortTitle ) ) {
2293                                                 // An anonymous user
2294                                                 $recipient->setNewtalk( true, $revision );
2295                                         } elseif ( $recipient->isLoggedIn() ) {
2296                                                 $recipient->setNewtalk( true, $revision );
2297                                         } else {
2298                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2299                                         }
2300                                 }
2301                         }
2302                 }
2303
2304                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2305                         MessageCache::singleton()->updateMessageOverride( $this->mTitle, $content );
2306                 }
2307
2308                 if ( $options['created'] ) {
2309                         self::onArticleCreate( $this->mTitle );
2310                 } elseif ( $options['changed'] ) { // T52785
2311                         self::onArticleEdit( $this->mTitle, $revision );
2312                 }
2313
2314                 ResourceLoaderWikiModule::invalidateModuleCache(
2315                         $this->mTitle, $options['oldrevision'], $revision, wfWikiID()
2316                 );
2317         }
2318
2319         /**
2320          * Update the article's restriction field, and leave a log entry.
2321          * This works for protection both existing and non-existing pages.
2322          *
2323          * @param array $limit Set of restriction keys
2324          * @param array $expiry Per restriction type expiration
2325          * @param int &$cascade Set to false if cascading protection isn't allowed.
2326          * @param string $reason
2327          * @param User $user The user updating the restrictions
2328          * @param string|string[] $tags Change tags to add to the pages and protection log entries
2329          *   ($user should be able to add the specified tags before this is called)
2330          * @return Status Status object; if action is taken, $status->value is the log_id of the
2331          *   protection log entry.
2332          */
2333         public function doUpdateRestrictions( array $limit, array $expiry,
2334                 &$cascade, $reason, User $user, $tags = null
2335         ) {
2336                 global $wgCascadingRestrictionLevels;
2337
2338                 if ( wfReadOnly() ) {
2339                         return Status::newFatal( wfMessage( 'readonlytext', wfReadOnlyReason() ) );
2340                 }
2341
2342                 $this->loadPageData( 'fromdbmaster' );
2343                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2344                 $id = $this->getId();
2345
2346                 if ( !$cascade ) {
2347                         $cascade = false;
2348                 }
2349
2350                 // Take this opportunity to purge out expired restrictions
2351                 Title::purgeExpiredRestrictions();
2352
2353                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2354                 // we expect a single selection, but the schema allows otherwise.
2355                 $isProtected = false;
2356                 $protect = false;
2357                 $changed = false;
2358
2359                 $dbw = wfGetDB( DB_MASTER );
2360
2361                 foreach ( $restrictionTypes as $action ) {
2362                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2363                                 $expiry[$action] = 'infinity';
2364                         }
2365                         if ( !isset( $limit[$action] ) ) {
2366                                 $limit[$action] = '';
2367                         } elseif ( $limit[$action] != '' ) {
2368                                 $protect = true;
2369                         }
2370
2371                         // Get current restrictions on $action
2372                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2373                         if ( $current != '' ) {
2374                                 $isProtected = true;
2375                         }
2376
2377                         if ( $limit[$action] != $current ) {
2378                                 $changed = true;
2379                         } elseif ( $limit[$action] != '' ) {
2380                                 // Only check expiry change if the action is actually being
2381                                 // protected, since expiry does nothing on an not-protected
2382                                 // action.
2383                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2384                                         $changed = true;
2385                                 }
2386                         }
2387                 }
2388
2389                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2390                         $changed = true;
2391                 }
2392
2393                 // If nothing has changed, do nothing
2394                 if ( !$changed ) {
2395                         return Status::newGood();
2396                 }
2397
2398                 if ( !$protect ) { // No protection at all means unprotection
2399                         $revCommentMsg = 'unprotectedarticle-comment';
2400                         $logAction = 'unprotect';
2401                 } elseif ( $isProtected ) {
2402                         $revCommentMsg = 'modifiedarticleprotection-comment';
2403                         $logAction = 'modify';
2404                 } else {
2405                         $revCommentMsg = 'protectedarticle-comment';
2406                         $logAction = 'protect';
2407                 }
2408
2409                 $logRelationsValues = [];
2410                 $logRelationsField = null;
2411                 $logParamsDetails = [];
2412
2413                 // Null revision (used for change tag insertion)
2414                 $nullRevision = null;
2415
2416                 if ( $id ) { // Protection of existing page
2417                         // Avoid PHP 7.1 warning of passing $this by reference
2418                         $wikiPage = $this;
2419
2420                         if ( !Hooks::run( 'ArticleProtect', [ &$wikiPage, &$user, $limit, $reason ] ) ) {
2421                                 return Status::newGood();
2422                         }
2423
2424                         // Only certain restrictions can cascade...
2425                         $editrestriction = isset( $limit['edit'] )
2426                                 ? [ $limit['edit'] ]
2427                                 : $this->mTitle->getRestrictions( 'edit' );
2428                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2429                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2430                         }
2431                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2432                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2433                         }
2434
2435                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2436                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2437                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2438                         }
2439                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2440                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2441                         }
2442
2443                         // The schema allows multiple restrictions
2444                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2445                                 $cascade = false;
2446                         }
2447
2448                         // insert null revision to identify the page protection change as edit summary
2449                         $latest = $this->getLatest();
2450                         $nullRevision = $this->insertProtectNullRevision(
2451                                 $revCommentMsg,
2452                                 $limit,
2453                                 $expiry,
2454                                 $cascade,
2455                                 $reason,
2456                                 $user
2457                         );
2458
2459                         if ( $nullRevision === null ) {
2460                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2461                         }
2462
2463                         $logRelationsField = 'pr_id';
2464
2465                         // Update restrictions table
2466                         foreach ( $limit as $action => $restrictions ) {
2467                                 $dbw->delete(
2468                                         'page_restrictions',
2469                                         [
2470                                                 'pr_page' => $id,
2471                                                 'pr_type' => $action
2472                                         ],
2473                                         __METHOD__
2474                                 );
2475                                 if ( $restrictions != '' ) {
2476                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2477                                         $dbw->insert(
2478                                                 'page_restrictions',
2479                                                 [
2480                                                         'pr_page' => $id,
2481                                                         'pr_type' => $action,
2482                                                         'pr_level' => $restrictions,
2483                                                         'pr_cascade' => $cascadeValue,
2484                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2485                                                 ],
2486                                                 __METHOD__
2487                                         );
2488                                         $logRelationsValues[] = $dbw->insertId();
2489                                         $logParamsDetails[] = [
2490                                                 'type' => $action,
2491                                                 'level' => $restrictions,
2492                                                 'expiry' => $expiry[$action],
2493                                                 'cascade' => (bool)$cascadeValue,
2494                                         ];
2495                                 }
2496                         }
2497
2498                         // Clear out legacy restriction fields
2499                         $dbw->update(
2500                                 'page',
2501                                 [ 'page_restrictions' => '' ],
2502                                 [ 'page_id' => $id ],
2503                                 __METHOD__
2504                         );
2505
2506                         // Avoid PHP 7.1 warning of passing $this by reference
2507                         $wikiPage = $this;
2508
2509                         Hooks::run( 'NewRevisionFromEditComplete',
2510                                 [ $this, $nullRevision, $latest, $user ] );
2511                         Hooks::run( 'ArticleProtectComplete', [ &$wikiPage, &$user, $limit, $reason ] );
2512                 } else { // Protection of non-existing page (also known as "title protection")
2513                         // Cascade protection is meaningless in this case
2514                         $cascade = false;
2515
2516                         if ( $limit['create'] != '' ) {
2517                                 $commentFields = CommentStore::newKey( 'pt_reason' )->insert( $dbw, $reason );
2518                                 $dbw->replace( 'protected_titles',
2519                                         [ [ 'pt_namespace', 'pt_title' ] ],
2520                                         [
2521                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2522                                                 'pt_title' => $this->mTitle->getDBkey(),
2523                                                 'pt_create_perm' => $limit['create'],
2524                                                 'pt_timestamp' => $dbw->timestamp(),
2525                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2526                                                 'pt_user' => $user->getId(),
2527                                         ] + $commentFields, __METHOD__
2528                                 );
2529                                 $logParamsDetails[] = [
2530                                         'type' => 'create',
2531                                         'level' => $limit['create'],
2532                                         'expiry' => $expiry['create'],
2533                                 ];
2534                         } else {
2535                                 $dbw->delete( 'protected_titles',
2536                                         [
2537                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2538                                                 'pt_title' => $this->mTitle->getDBkey()
2539                                         ], __METHOD__
2540                                 );
2541                         }
2542                 }
2543
2544                 $this->mTitle->flushRestrictions();
2545                 InfoAction::invalidateCache( $this->mTitle );
2546
2547                 if ( $logAction == 'unprotect' ) {
2548                         $params = [];
2549                 } else {
2550                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2551                         $params = [
2552                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2553                                 '5:bool:cascade' => $cascade,
2554                                 'details' => $logParamsDetails, // parameter for localize and api
2555                         ];
2556                 }
2557
2558                 // Update the protection log
2559                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2560                 $logEntry->setTarget( $this->mTitle );
2561                 $logEntry->setComment( $reason );
2562                 $logEntry->setPerformer( $user );
2563                 $logEntry->setParameters( $params );
2564                 if ( !is_null( $nullRevision ) ) {
2565                         $logEntry->setAssociatedRevId( $nullRevision->getId() );
2566                 }
2567                 $logEntry->setTags( $tags );
2568                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2569                         $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
2570                 }
2571                 $logId = $logEntry->insert();
2572                 $logEntry->publish( $logId );
2573
2574                 return Status::newGood( $logId );
2575         }
2576
2577         /**
2578          * Insert a new null revision for this page.
2579          *
2580          * @param string $revCommentMsg Comment message key for the revision
2581          * @param array $limit Set of restriction keys
2582          * @param array $expiry Per restriction type expiration
2583          * @param int $cascade Set to false if cascading protection isn't allowed.
2584          * @param string $reason
2585          * @param User|null $user
2586          * @return Revision|null Null on error
2587          */
2588         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2589                 array $expiry, $cascade, $reason, $user = null
2590         ) {
2591                 $dbw = wfGetDB( DB_MASTER );
2592
2593                 // Prepare a null revision to be added to the history
2594                 $editComment = wfMessage(
2595                         $revCommentMsg,
2596                         $this->mTitle->getPrefixedText(),
2597                         $user ? $user->getName() : ''
2598                 )->inContentLanguage()->text();
2599                 if ( $reason ) {
2600                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2601                 }
2602                 $protectDescription = $this->protectDescription( $limit, $expiry );
2603                 if ( $protectDescription ) {
2604                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2605                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2606                                 ->inContentLanguage()->text();
2607                 }
2608                 if ( $cascade ) {
2609                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2610                         $editComment .= wfMessage( 'brackets' )->params(
2611                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2612                         )->inContentLanguage()->text();
2613                 }
2614
2615                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2616                 if ( $nullRev ) {
2617                         $nullRev->insertOn( $dbw );
2618
2619                         // Update page record and touch page
2620                         $oldLatest = $nullRev->getParentId();
2621                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2622                 }
2623
2624                 return $nullRev;
2625         }
2626
2627         /**
2628          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2629          * @return string
2630          */
2631         protected function formatExpiry( $expiry ) {
2632                 global $wgContLang;
2633
2634                 if ( $expiry != 'infinity' ) {
2635                         return wfMessage(
2636                                 'protect-expiring',
2637                                 $wgContLang->timeanddate( $expiry, false, false ),
2638                                 $wgContLang->date( $expiry, false, false ),
2639                                 $wgContLang->time( $expiry, false, false )
2640                         )->inContentLanguage()->text();
2641                 } else {
2642                         return wfMessage( 'protect-expiry-indefinite' )
2643                                 ->inContentLanguage()->text();
2644                 }
2645         }
2646
2647         /**
2648          * Builds the description to serve as comment for the edit.
2649          *
2650          * @param array $limit Set of restriction keys
2651          * @param array $expiry Per restriction type expiration
2652          * @return string
2653          */
2654         public function protectDescription( array $limit, array $expiry ) {
2655                 $protectDescription = '';
2656
2657                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2658                         # $action is one of $wgRestrictionTypes = [ 'create', 'edit', 'move', 'upload' ].
2659                         # All possible message keys are listed here for easier grepping:
2660                         # * restriction-create
2661                         # * restriction-edit
2662                         # * restriction-move
2663                         # * restriction-upload
2664                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2665                         # $restrictions is one of $wgRestrictionLevels = [ '', 'autoconfirmed', 'sysop' ],
2666                         # with '' filtered out. All possible message keys are listed below:
2667                         # * protect-level-autoconfirmed
2668                         # * protect-level-sysop
2669                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
2670                                 ->inContentLanguage()->text();
2671
2672                         $expiryText = $this->formatExpiry( $expiry[$action] );
2673
2674                         if ( $protectDescription !== '' ) {
2675                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2676                         }
2677                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2678                                 ->params( $actionText, $restrictionsText, $expiryText )
2679                                 ->inContentLanguage()->text();
2680                 }
2681
2682                 return $protectDescription;
2683         }
2684
2685         /**
2686          * Builds the description to serve as comment for the log entry.
2687          *
2688          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2689          * protect description text. Keep them in old format to avoid breaking compatibility.
2690          * TODO: Fix protection log to store structured description and format it on-the-fly.
2691          *
2692          * @param array $limit Set of restriction keys
2693          * @param array $expiry Per restriction type expiration
2694          * @return string
2695          */
2696         public function protectDescriptionLog( array $limit, array $expiry ) {
2697                 global $wgContLang;
2698
2699                 $protectDescriptionLog = '';
2700
2701                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2702                         $expiryText = $this->formatExpiry( $expiry[$action] );
2703                         $protectDescriptionLog .= $wgContLang->getDirMark() .
2704                                 "[$action=$restrictions] ($expiryText)";
2705                 }
2706
2707                 return trim( $protectDescriptionLog );
2708         }
2709
2710         /**
2711          * Take an array of page restrictions and flatten it to a string
2712          * suitable for insertion into the page_restrictions field.
2713          *
2714          * @param string[] $limit
2715          *
2716          * @throws MWException
2717          * @return string
2718          */
2719         protected static function flattenRestrictions( $limit ) {
2720                 if ( !is_array( $limit ) ) {
2721                         throw new MWException( __METHOD__ . ' given non-array restriction set' );
2722                 }
2723
2724                 $bits = [];
2725                 ksort( $limit );
2726
2727                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2728                         $bits[] = "$action=$restrictions";
2729                 }
2730
2731                 return implode( ':', $bits );
2732         }
2733
2734         /**
2735          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2736          * backwards compatibility, if you care about error reporting you should use
2737          * doDeleteArticleReal() instead.
2738          *
2739          * Deletes the article with database consistency, writes logs, purges caches
2740          *
2741          * @param string $reason Delete reason for deletion log
2742          * @param bool $suppress Suppress all revisions and log the deletion in
2743          *        the suppression log instead of the deletion log
2744          * @param int $u1 Unused
2745          * @param bool $u2 Unused
2746          * @param array|string &$error Array of errors to append to
2747          * @param User $user The deleting user
2748          * @return bool True if successful
2749          */
2750         public function doDeleteArticle(
2751                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2752         ) {
2753                 $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
2754                 return $status->isGood();
2755         }
2756
2757         /**
2758          * Back-end article deletion
2759          * Deletes the article with database consistency, writes logs, purges caches
2760          *
2761          * @since 1.19
2762          *
2763          * @param string $reason Delete reason for deletion log
2764          * @param bool $suppress Suppress all revisions and log the deletion in
2765          *   the suppression log instead of the deletion log
2766          * @param int $u1 Unused
2767          * @param bool $u2 Unused
2768          * @param array|string &$error Array of errors to append to
2769          * @param User $user The deleting user
2770          * @param array $tags Tags to apply to the deletion action
2771          * @param string $logsubtype
2772          * @return Status Status object; if successful, $status->value is the log_id of the
2773          *   deletion log entry. If the page couldn't be deleted because it wasn't
2774          *   found, $status is a non-fatal 'cannotdelete' error
2775          */
2776         public function doDeleteArticleReal(
2777                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2778                 $tags = [], $logsubtype = 'delete'
2779         ) {
2780                 global $wgUser, $wgContentHandlerUseDB, $wgCommentTableSchemaMigrationStage;
2781
2782                 wfDebug( __METHOD__ . "\n" );
2783
2784                 $status = Status::newGood();
2785
2786                 if ( $this->mTitle->getDBkey() === '' ) {
2787                         $status->error( 'cannotdelete',
2788                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2789                         return $status;
2790                 }
2791
2792                 // Avoid PHP 7.1 warning of passing $this by reference
2793                 $wikiPage = $this;
2794
2795                 $user = is_null( $user ) ? $wgUser : $user;
2796                 if ( !Hooks::run( 'ArticleDelete',
2797                         [ &$wikiPage, &$user, &$reason, &$error, &$status, $suppress ]
2798                 ) ) {
2799                         if ( $status->isOK() ) {
2800                                 // Hook aborted but didn't set a fatal status
2801                                 $status->fatal( 'delete-hook-aborted' );
2802                         }
2803                         return $status;
2804                 }
2805
2806                 $dbw = wfGetDB( DB_MASTER );
2807                 $dbw->startAtomic( __METHOD__ );
2808
2809                 $this->loadPageData( self::READ_LATEST );
2810                 $id = $this->getId();
2811                 // T98706: lock the page from various other updates but avoid using
2812                 // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2813                 // the revisions queries (which also JOIN on user). Only lock the page
2814                 // row and CAS check on page_latest to see if the trx snapshot matches.
2815                 $lockedLatest = $this->lockAndGetLatest();
2816                 if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
2817                         $dbw->endAtomic( __METHOD__ );
2818                         // Page not there or trx snapshot is stale
2819                         $status->error( 'cannotdelete',
2820                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2821                         return $status;
2822                 }
2823
2824                 // Given the lock above, we can be confident in the title and page ID values
2825                 $namespace = $this->getTitle()->getNamespace();
2826                 $dbKey = $this->getTitle()->getDBkey();
2827
2828                 // At this point we are now comitted to returning an OK
2829                 // status unless some DB query error or other exception comes up.
2830                 // This way callers don't have to call rollback() if $status is bad
2831                 // unless they actually try to catch exceptions (which is rare).
2832
2833                 // we need to remember the old content so we can use it to generate all deletion updates.
2834                 $revision = $this->getRevision();
2835                 try {
2836                         $content = $this->getContent( Revision::RAW );
2837                 } catch ( Exception $ex ) {
2838                         wfLogWarning( __METHOD__ . ': failed to load content during deletion! '
2839                                 . $ex->getMessage() );
2840
2841                         $content = null;
2842                 }
2843
2844                 $revCommentStore = new CommentStore( 'rev_comment' );
2845                 $arCommentStore = new CommentStore( 'ar_comment' );
2846
2847                 $revQuery = Revision::getQueryInfo();
2848                 $bitfield = false;
2849
2850                 // Bitfields to further suppress the content
2851                 if ( $suppress ) {
2852                         $bitfield = Revision::SUPPRESSED_ALL;
2853                         $revQuery['fields'] = array_diff( $revQuery['fields'], [ 'rev_deleted' ] );
2854                 }
2855
2856                 // For now, shunt the revision data into the archive table.
2857                 // Text is *not* removed from the text table; bulk storage
2858                 // is left intact to avoid breaking block-compression or
2859                 // immutable storage schemes.
2860                 // In the future, we may keep revisions and mark them with
2861                 // the rev_deleted field, which is reserved for this purpose.
2862
2863                 // Get all of the page revisions
2864                 $res = $dbw->select(
2865                         $revQuery['tables'],
2866                         $revQuery['fields'],
2867                         [ 'rev_page' => $id ],
2868                         __METHOD__,
2869                         'FOR UPDATE',
2870                         $revQuery['joins']
2871                 );
2872
2873                 // Build their equivalent archive rows
2874                 $rowsInsert = [];
2875                 $revids = [];
2876
2877                 /** @var int[] Revision IDs of edits that were made by IPs */
2878                 $ipRevIds = [];
2879
2880                 foreach ( $res as $row ) {
2881                         $comment = $revCommentStore->getComment( $row );
2882                         $rowInsert = [
2883                                 'ar_namespace'  => $namespace,
2884                                 'ar_title'      => $dbKey,
2885                                 'ar_user'       => $row->rev_user,
2886                                 'ar_user_text'  => $row->rev_user_text,
2887                                 'ar_timestamp'  => $row->rev_timestamp,
2888                                 'ar_minor_edit' => $row->rev_minor_edit,
2889                                 'ar_rev_id'     => $row->rev_id,
2890                                 'ar_parent_id'  => $row->rev_parent_id,
2891                                 'ar_text_id'    => $row->rev_text_id,
2892                                 'ar_text'       => '',
2893                                 'ar_flags'      => '',
2894                                 'ar_len'        => $row->rev_len,
2895                                 'ar_page_id'    => $id,
2896                                 'ar_deleted'    => $suppress ? $bitfield : $row->rev_deleted,
2897                                 'ar_sha1'       => $row->rev_sha1,
2898                         ] + $arCommentStore->insert( $dbw, $comment );
2899                         if ( $wgContentHandlerUseDB ) {
2900                                 $rowInsert['ar_content_model'] = $row->rev_content_model;
2901                                 $rowInsert['ar_content_format'] = $row->rev_content_format;
2902                         }
2903                         $rowsInsert[] = $rowInsert;
2904                         $revids[] = $row->rev_id;
2905
2906                         // Keep track of IP edits, so that the corresponding rows can
2907                         // be deleted in the ip_changes table.
2908                         if ( (int)$row->rev_user === 0 && IP::isValid( $row->rev_user_text ) ) {
2909                                 $ipRevIds[] = $row->rev_id;
2910                         }
2911                 }
2912                 // Copy them into the archive table
2913                 $dbw->insert( 'archive', $rowsInsert, __METHOD__ );
2914                 // Save this so we can pass it to the ArticleDeleteComplete hook.
2915                 $archivedRevisionCount = $dbw->affectedRows();
2916
2917                 // Clone the title and wikiPage, so we have the information we need when
2918                 // we log and run the ArticleDeleteComplete hook.
2919                 $logTitle = clone $this->mTitle;
2920                 $wikiPageBeforeDelete = clone $this;
2921
2922                 // Now that it's safely backed up, delete it
2923                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
2924                 $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
2925                 if ( $wgCommentTableSchemaMigrationStage > MIGRATION_OLD ) {
2926                         $dbw->delete( 'revision_comment_temp', [ 'revcomment_rev' => $revids ], __METHOD__ );
2927                 }
2928
2929                 // Also delete records from ip_changes as applicable.
2930                 if ( count( $ipRevIds ) > 0 ) {
2931                         $dbw->delete( 'ip_changes', [ 'ipc_rev_id' => $ipRevIds ], __METHOD__ );
2932                 }
2933
2934                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
2935                 $logtype = $suppress ? 'suppress' : 'delete';
2936
2937                 $logEntry = new ManualLogEntry( $logtype, $logsubtype );
2938                 $logEntry->setPerformer( $user );
2939                 $logEntry->setTarget( $logTitle );
2940                 $logEntry->setComment( $reason );
2941                 $logEntry->setTags( $tags );
2942                 $logid = $logEntry->insert();
2943
2944                 $dbw->onTransactionPreCommitOrIdle(
2945                         function () use ( $dbw, $logEntry, $logid ) {
2946                                 // T58776: avoid deadlocks (especially from FileDeleteForm)
2947                                 $logEntry->publish( $logid );
2948                         },
2949                         __METHOD__
2950                 );
2951
2952                 $dbw->endAtomic( __METHOD__ );
2953
2954                 $this->doDeleteUpdates( $id, $content, $revision, $user );
2955
2956                 Hooks::run( 'ArticleDeleteComplete', [
2957                         &$wikiPageBeforeDelete,
2958                         &$user,
2959                         $reason,
2960                         $id,
2961                         $content,
2962                         $logEntry,
2963                         $archivedRevisionCount
2964                 ] );
2965                 $status->value = $logid;
2966
2967                 // Show log excerpt on 404 pages rather than just a link
2968                 $cache = MediaWikiServices::getInstance()->getMainObjectStash();
2969                 $key = $cache->makeKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
2970                 $cache->set( $key, 1, $cache::TTL_DAY );
2971
2972                 return $status;
2973         }
2974
2975         /**
2976          * Lock the page row for this title+id and return page_latest (or 0)
2977          *
2978          * @return int Returns 0 if no row was found with this title+id
2979          * @since 1.27
2980          */
2981         public function lockAndGetLatest() {
2982                 return (int)wfGetDB( DB_MASTER )->selectField(
2983                         'page',
2984                         'page_latest',
2985                         [
2986                                 'page_id' => $this->getId(),
2987                                 // Typically page_id is enough, but some code might try to do
2988                                 // updates assuming the title is the same, so verify that
2989                                 'page_namespace' => $this->getTitle()->getNamespace(),
2990                                 'page_title' => $this->getTitle()->getDBkey()
2991                         ],
2992                         __METHOD__,
2993                         [ 'FOR UPDATE' ]
2994                 );
2995         }
2996
2997         /**
2998          * Do some database updates after deletion
2999          *
3000          * @param int $id The page_id value of the page being deleted
3001          * @param Content|null $content Optional page content to be used when determining
3002          *   the required updates. This may be needed because $this->getContent()
3003          *   may already return null when the page proper was deleted.
3004          * @param Revision|null $revision The latest page revision
3005          * @param User|null $user The user that caused the deletion
3006          */
3007         public function doDeleteUpdates(
3008                 $id, Content $content = null, Revision $revision = null, User $user = null
3009         ) {
3010                 try {
3011                         $countable = $this->isCountable();
3012                 } catch ( Exception $ex ) {
3013                         // fallback for deleting broken pages for which we cannot load the content for
3014                         // some reason. Note that doDeleteArticleReal() already logged this problem.
3015                         $countable = false;
3016                 }
3017
3018                 // Update site status
3019                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$countable, -1 ) );
3020
3021                 // Delete pagelinks, update secondary indexes, etc
3022                 $updates = $this->getDeletionUpdates( $content );
3023                 foreach ( $updates as $update ) {
3024                         DeferredUpdates::addUpdate( $update );
3025                 }
3026
3027                 $causeAgent = $user ? $user->getName() : 'unknown';
3028                 // Reparse any pages transcluding this page
3029                 LinksUpdate::queueRecursiveJobsForTable(
3030                         $this->mTitle, 'templatelinks', 'delete-page', $causeAgent );
3031                 // Reparse any pages including this image
3032                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
3033                         LinksUpdate::queueRecursiveJobsForTable(
3034                                 $this->mTitle, 'imagelinks', 'delete-page', $causeAgent );
3035                 }
3036
3037                 // Clear caches
3038                 self::onArticleDelete( $this->mTitle );
3039                 ResourceLoaderWikiModule::invalidateModuleCache(
3040                         $this->mTitle, $revision, null, wfWikiID()
3041                 );
3042
3043                 // Reset this object and the Title object
3044                 $this->loadFromRow( false, self::READ_LATEST );
3045
3046                 // Search engine
3047                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
3048         }
3049
3050         /**
3051          * Roll back the most recent consecutive set of edits to a page
3052          * from the same user; fails if there are no eligible edits to
3053          * roll back to, e.g. user is the sole contributor. This function
3054          * performs permissions checks on $user, then calls commitRollback()
3055          * to do the dirty work
3056          *
3057          * @todo Separate the business/permission stuff out from backend code
3058          * @todo Remove $token parameter. Already verified by RollbackAction and ApiRollback.
3059          *
3060          * @param string $fromP Name of the user whose edits to rollback.
3061          * @param string $summary Custom summary. Set to default summary if empty.
3062          * @param string $token Rollback token.
3063          * @param bool $bot If true, mark all reverted edits as bot.
3064          *
3065          * @param array &$resultDetails Array contains result-specific array of additional values
3066          *    'alreadyrolled' : 'current' (rev)
3067          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3068          *
3069          * @param User $user The user performing the rollback
3070          * @param array|null $tags Change tags to apply to the rollback
3071          * Callers are responsible for permission checks
3072          * (with ChangeTags::canAddTagsAccompanyingChange)
3073          *
3074          * @return array Array of errors, each error formatted as
3075          *   array(messagekey, param1, param2, ...).
3076          * On success, the array is empty.  This array can also be passed to
3077          * OutputPage::showPermissionsErrorPage().
3078          */
3079         public function doRollback(
3080                 $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
3081         ) {
3082                 $resultDetails = null;
3083
3084                 // Check permissions
3085                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
3086                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
3087                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3088
3089                 if ( !$user->matchEditToken( $token, 'rollback' ) ) {
3090                         $errors[] = [ 'sessionfailure' ];
3091                 }
3092
3093                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
3094                         $errors[] = [ 'actionthrottledtext' ];
3095                 }
3096
3097                 // If there were errors, bail out now
3098                 if ( !empty( $errors ) ) {
3099                         return $errors;
3100                 }
3101
3102                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
3103         }
3104
3105         /**
3106          * Backend implementation of doRollback(), please refer there for parameter
3107          * and return value documentation
3108          *
3109          * NOTE: This function does NOT check ANY permissions, it just commits the
3110          * rollback to the DB. Therefore, you should only call this function direct-
3111          * ly if you want to use custom permissions checks. If you don't, use
3112          * doRollback() instead.
3113          * @param string $fromP Name of the user whose edits to rollback.
3114          * @param string $summary Custom summary. Set to default summary if empty.
3115          * @param bool $bot If true, mark all reverted edits as bot.
3116          *
3117          * @param array &$resultDetails Contains result-specific array of additional values
3118          * @param User $guser The user performing the rollback
3119          * @param array|null $tags Change tags to apply to the rollback
3120          * Callers are responsible for permission checks
3121          * (with ChangeTags::canAddTagsAccompanyingChange)
3122          *
3123          * @return array
3124          */
3125         public function commitRollback( $fromP, $summary, $bot,
3126                 &$resultDetails, User $guser, $tags = null
3127         ) {
3128                 global $wgUseRCPatrol, $wgContLang;
3129
3130                 $dbw = wfGetDB( DB_MASTER );
3131
3132                 if ( wfReadOnly() ) {
3133                         return [ [ 'readonlytext' ] ];
3134                 }
3135
3136                 // Get the last editor
3137                 $current = $this->getRevision();
3138                 if ( is_null( $current ) ) {
3139                         // Something wrong... no page?
3140                         return [ [ 'notanarticle' ] ];
3141                 }
3142
3143                 $from = str_replace( '_', ' ', $fromP );
3144                 // User name given should match up with the top revision.
3145                 // If the user was deleted then $from should be empty.
3146                 if ( $from != $current->getUserText() ) {
3147                         $resultDetails = [ 'current' => $current ];
3148                         return [ [ 'alreadyrolled',
3149                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3150                                 htmlspecialchars( $fromP ),
3151                                 htmlspecialchars( $current->getUserText() )
3152                         ] ];
3153                 }
3154
3155                 // Get the last edit not by this person...
3156                 // Note: these may not be public values
3157                 $user = intval( $current->getUser( Revision::RAW ) );
3158                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3159                 $s = $dbw->selectRow( 'revision',
3160                         [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
3161                         [ 'rev_page' => $current->getPage(),
3162                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3163                         ], __METHOD__,
3164                         [ 'USE INDEX' => 'page_timestamp',
3165                                 'ORDER BY' => 'rev_timestamp DESC' ]
3166                         );
3167                 if ( $s === false ) {
3168                         // No one else ever edited this page
3169                         return [ [ 'cantrollback' ] ];
3170                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3171                         || $s->rev_deleted & Revision::DELETED_USER
3172                 ) {
3173                         // Only admins can see this text
3174                         return [ [ 'notvisiblerev' ] ];
3175                 }
3176
3177                 // Generate the edit summary if necessary
3178                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3179                 if ( empty( $summary ) ) {
3180                         if ( $from == '' ) { // no public user name
3181                                 $summary = wfMessage( 'revertpage-nouser' );
3182                         } else {
3183                                 $summary = wfMessage( 'revertpage' );
3184                         }
3185                 }
3186
3187                 // Allow the custom summary to use the same args as the default message
3188                 $args = [
3189                         $target->getUserText(), $from, $s->rev_id,
3190                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3191                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3192                 ];
3193                 if ( $summary instanceof Message ) {
3194                         $summary = $summary->params( $args )->inContentLanguage()->text();
3195                 } else {
3196                         $summary = wfMsgReplaceArgs( $summary, $args );
3197                 }
3198
3199                 // Trim spaces on user supplied text
3200                 $summary = trim( $summary );
3201
3202                 // Save
3203                 $flags = EDIT_UPDATE | EDIT_INTERNAL;
3204
3205                 if ( $guser->isAllowed( 'minoredit' ) ) {
3206                         $flags |= EDIT_MINOR;
3207                 }
3208
3209                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3210                         $flags |= EDIT_FORCE_BOT;
3211                 }
3212
3213                 $targetContent = $target->getContent();
3214                 $changingContentModel = $targetContent->getModel() !== $current->getContentModel();
3215
3216                 if ( in_array( 'mw-rollback', ChangeTags::getSoftwareTags() ) ) {
3217                         $tags[] = 'mw-rollback';
3218                 }
3219
3220                 // Actually store the edit
3221                 $status = $this->doEditContent(
3222                         $targetContent,
3223                         $summary,
3224                         $flags,
3225                         $target->getId(),
3226                         $guser,
3227                         null,
3228                         $tags
3229                 );
3230
3231                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3232                 // This is done even on edit failure to have patrolling in that case (T64157).
3233                 $set = [];
3234                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3235                         // Mark all reverted edits as bot
3236                         $set['rc_bot'] = 1;
3237                 }
3238
3239                 if ( $wgUseRCPatrol ) {
3240                         // Mark all reverted edits as patrolled
3241                         $set['rc_patrolled'] = 1;
3242                 }
3243
3244                 if ( count( $set ) ) {
3245                         $dbw->update( 'recentchanges', $set,
3246                                 [ /* WHERE */
3247                                         'rc_cur_id' => $current->getPage(),
3248                                         'rc_user_text' => $current->getUserText(),
3249                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3250                                 ],
3251                                 __METHOD__
3252                         );
3253                 }
3254
3255                 if ( !$status->isOK() ) {
3256                         return $status->getErrorsArray();
3257                 }
3258
3259                 // raise error, when the edit is an edit without a new version
3260                 $statusRev = isset( $status->value['revision'] )
3261                         ? $status->value['revision']
3262                         : null;
3263                 if ( !( $statusRev instanceof Revision ) ) {
3264                         $resultDetails = [ 'current' => $current ];
3265                         return [ [ 'alreadyrolled',
3266                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3267                                         htmlspecialchars( $fromP ),
3268                                         htmlspecialchars( $current->getUserText() )
3269                         ] ];
3270                 }
3271
3272                 if ( $changingContentModel ) {
3273                         // If the content model changed during the rollback,
3274                         // make sure it gets logged to Special:Log/contentmodel
3275                         $log = new ManualLogEntry( 'contentmodel', 'change' );
3276                         $log->setPerformer( $guser );
3277                         $log->setTarget( $this->mTitle );
3278                         $log->setComment( $summary );
3279                         $log->setParameters( [
3280                                 '4::oldmodel' => $current->getContentModel(),
3281                                 '5::newmodel' => $targetContent->getModel(),
3282                         ] );
3283
3284                         $logId = $log->insert( $dbw );
3285                         $log->publish( $logId );
3286                 }
3287
3288                 $revId = $statusRev->getId();
3289
3290                 Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );
3291
3292                 $resultDetails = [
3293                         'summary' => $summary,
3294                         'current' => $current,
3295                         'target' => $target,
3296                         'newid' => $revId,
3297                         'tags' => $tags
3298                 ];
3299
3300                 return [];
3301         }
3302
3303         /**
3304          * The onArticle*() functions are supposed to be a kind of hooks
3305          * which should be called whenever any of the specified actions
3306          * are done.
3307          *
3308          * This is a good place to put code to clear caches, for instance.
3309          *
3310          * This is called on page move and undelete, as well as edit
3311          *
3312          * @param Title $title
3313          */
3314         public static function onArticleCreate( Title $title ) {
3315                 // Update existence markers on article/talk tabs...
3316                 $other = $title->getOtherPage();
3317
3318                 $other->purgeSquid();
3319
3320                 $title->touchLinks();
3321                 $title->purgeSquid();
3322                 $title->deleteTitleProtection();
3323
3324                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3325
3326                 // Invalidate caches of articles which include this page
3327                 DeferredUpdates::addUpdate(
3328                         new HTMLCacheUpdate( $title, 'templatelinks', 'page-create' )
3329                 );
3330
3331                 if ( $title->getNamespace() == NS_CATEGORY ) {
3332                         // Load the Category object, which will schedule a job to create
3333                         // the category table row if necessary. Checking a replica DB is ok
3334                         // here, in the worst case it'll run an unnecessary recount job on
3335                         // a category that probably doesn't have many members.
3336                         Category::newFromTitle( $title )->getID();
3337                 }
3338         }
3339
3340         /**
3341          * Clears caches when article is deleted
3342          *
3343          * @param Title $title
3344          */
3345         public static function onArticleDelete( Title $title ) {
3346                 // Update existence markers on article/talk tabs...
3347                 $other = $title->getOtherPage();
3348
3349                 $other->purgeSquid();
3350
3351                 $title->touchLinks();
3352                 $title->purgeSquid();
3353
3354                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3355
3356                 // File cache
3357                 HTMLFileCache::clearFileCache( $title );
3358                 InfoAction::invalidateCache( $title );
3359
3360                 // Messages
3361                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3362                         MessageCache::singleton()->updateMessageOverride( $title, null );
3363                 }
3364
3365                 // Images
3366                 if ( $title->getNamespace() == NS_FILE ) {
3367                         DeferredUpdates::addUpdate(
3368                                 new HTMLCacheUpdate( $title, 'imagelinks', 'page-delete' )
3369                         );
3370                 }
3371
3372                 // User talk pages
3373                 if ( $title->getNamespace() == NS_USER_TALK ) {
3374                         $user = User::newFromName( $title->getText(), false );
3375                         if ( $user ) {
3376                                 $user->setNewtalk( false );
3377                         }
3378                 }
3379
3380                 // Image redirects
3381                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3382         }
3383
3384         /**
3385          * Purge caches on page update etc
3386          *
3387          * @param Title $title
3388          * @param Revision|null $revision Revision that was just saved, may be null
3389          */
3390         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3391                 // Invalidate caches of articles which include this page
3392                 DeferredUpdates::addUpdate(
3393                         new HTMLCacheUpdate( $title, 'templatelinks', 'page-edit' )
3394                 );
3395
3396                 // Invalidate the caches of all pages which redirect here
3397                 DeferredUpdates::addUpdate(
3398                         new HTMLCacheUpdate( $title, 'redirect', 'page-edit' )
3399                 );
3400
3401                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3402
3403                 // Purge CDN for this page only
3404                 $title->purgeSquid();
3405                 // Clear file cache for this page only
3406                 HTMLFileCache::clearFileCache( $title );
3407
3408                 $revid = $revision ? $revision->getId() : null;
3409                 DeferredUpdates::addCallableUpdate( function () use ( $title, $revid ) {
3410                         InfoAction::invalidateCache( $title, $revid );
3411                 } );
3412         }
3413
3414         /**#@-*/
3415
3416         /**
3417          * Returns a list of categories this page is a member of.
3418          * Results will include hidden categories
3419          *
3420          * @return TitleArray
3421          */
3422         public function getCategories() {
3423                 $id = $this->getId();
3424                 if ( $id == 0 ) {
3425                         return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
3426                 }
3427
3428                 $dbr = wfGetDB( DB_REPLICA );
3429                 $res = $dbr->select( 'categorylinks',
3430                         [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
3431                         // Have to do that since Database::fieldNamesWithAlias treats numeric indexes
3432                         // as not being aliases, and NS_CATEGORY is numeric
3433                         [ 'cl_from' => $id ],
3434                         __METHOD__ );
3435
3436                 return TitleArray::newFromResult( $res );
3437         }
3438
3439         /**
3440          * Returns a list of hidden categories this page is a member of.
3441          * Uses the page_props and categorylinks tables.
3442          *
3443          * @return array Array of Title objects
3444          */
3445         public function getHiddenCategories() {
3446                 $result = [];
3447                 $id = $this->getId();
3448
3449                 if ( $id == 0 ) {
3450                         return [];
3451                 }
3452
3453                 $dbr = wfGetDB( DB_REPLICA );
3454                 $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
3455                         [ 'cl_to' ],
3456                         [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3457                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
3458                         __METHOD__ );
3459
3460                 if ( $res !== false ) {
3461                         foreach ( $res as $row ) {
3462                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3463                         }
3464                 }
3465
3466                 return $result;
3467         }
3468
3469         /**
3470          * Auto-generates a deletion reason
3471          *
3472          * @param bool &$hasHistory Whether the page has a history
3473          * @return string|bool String containing deletion reason or empty string, or boolean false
3474          *    if no revision occurred
3475          */
3476         public function getAutoDeleteReason( &$hasHistory ) {
3477                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3478         }
3479
3480         /**
3481          * Update all the appropriate counts in the category table, given that
3482          * we've added the categories $added and deleted the categories $deleted.
3483          *
3484          * This should only be called from deferred updates or jobs to avoid contention.
3485          *
3486          * @param array $added The names of categories that were added
3487          * @param array $deleted The names of categories that were deleted
3488          * @param int $id Page ID (this should be the original deleted page ID)
3489          */
3490         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
3491                 $id = $id ?: $this->getId();
3492                 $ns = $this->getTitle()->getNamespace();
3493
3494                 $addFields = [ 'cat_pages = cat_pages + 1' ];
3495                 $removeFields = [ 'cat_pages = cat_pages - 1' ];
3496                 if ( $ns == NS_CATEGORY ) {
3497                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3498                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3499                 } elseif ( $ns == NS_FILE ) {
3500                         $addFields[] = 'cat_files = cat_files + 1';
3501                         $removeFields[] = 'cat_files = cat_files - 1';
3502                 }
3503
3504                 $dbw = wfGetDB( DB_MASTER );
3505
3506                 if ( count( $added ) ) {
3507                         $existingAdded = $dbw->selectFieldValues(
3508                                 'category',
3509                                 'cat_title',
3510                                 [ 'cat_title' => $added ],
3511                                 __METHOD__
3512                         );
3513
3514                         // For category rows that already exist, do a plain
3515                         // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
3516                         // to avoid creating gaps in the cat_id sequence.
3517                         if ( count( $existingAdded ) ) {
3518                                 $dbw->update(
3519                                         'category',
3520                                         $addFields,
3521                                         [ 'cat_title' => $existingAdded ],
3522                                         __METHOD__
3523                                 );
3524                         }
3525
3526                         $missingAdded = array_diff( $added, $existingAdded );
3527                         if ( count( $missingAdded ) ) {
3528                                 $insertRows = [];
3529                                 foreach ( $missingAdded as $cat ) {
3530                                         $insertRows[] = [
3531                                                 'cat_title'   => $cat,
3532                                                 'cat_pages'   => 1,
3533                                                 'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3534                                                 'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3535                                         ];
3536                                 }
3537                                 $dbw->upsert(
3538                                         'category',
3539                                         $insertRows,
3540                                         [ 'cat_title' ],
3541                                         $addFields,
3542                                         __METHOD__
3543                                 );
3544                         }
3545                 }
3546
3547                 if ( count( $deleted ) ) {
3548                         $dbw->update(
3549                                 'category',
3550                                 $removeFields,
3551                                 [ 'cat_title' => $deleted ],
3552                                 __METHOD__
3553                         );
3554                 }
3555
3556                 foreach ( $added as $catName ) {
3557                         $cat = Category::newFromName( $catName );
3558                         Hooks::run( 'CategoryAfterPageAdded', [ $cat, $this ] );
3559                 }
3560
3561                 foreach ( $deleted as $catName ) {
3562                         $cat = Category::newFromName( $catName );
3563                         Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $this, $id ] );
3564                 }
3565
3566                 // Refresh counts on categories that should be empty now, to
3567                 // trigger possible deletion. Check master for the most
3568                 // up-to-date cat_pages.
3569                 if ( count( $deleted ) ) {
3570                         $rows = $dbw->select(
3571                                 'category',
3572                                 [ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ],
3573                                 [ 'cat_title' => $deleted, 'cat_pages <= 0' ],
3574                                 __METHOD__
3575                         );
3576                         foreach ( $rows as $row ) {
3577                                 $cat = Category::newFromRow( $row );
3578                                 // T166757: do the update after this DB commit
3579                                 DeferredUpdates::addCallableUpdate( function () use ( $cat ) {
3580                                         $cat->refreshCounts();
3581                                 } );
3582                         }
3583                 }
3584         }
3585
3586         /**
3587          * Opportunistically enqueue link update jobs given fresh parser output if useful
3588          *
3589          * @param ParserOutput $parserOutput Current version page output
3590          * @since 1.25
3591          */
3592         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3593                 if ( wfReadOnly() ) {
3594                         return;
3595                 }
3596
3597                 if ( !Hooks::run( 'OpportunisticLinksUpdate',
3598                         [ $this, $this->mTitle, $parserOutput ]
3599                 ) ) {
3600                         return;
3601                 }
3602
3603                 $config = RequestContext::getMain()->getConfig();
3604
3605                 $params = [
3606                         'isOpportunistic' => true,
3607                         'rootJobTimestamp' => $parserOutput->getCacheTime()
3608                 ];
3609
3610                 if ( $this->mTitle->areRestrictionsCascading() ) {
3611                         // If the page is cascade protecting, the links should really be up-to-date
3612                         JobQueueGroup::singleton()->lazyPush(
3613                                 RefreshLinksJob::newPrioritized( $this->mTitle, $params )
3614                         );
3615                 } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
3616                         // Assume the output contains "dynamic" time/random based magic words.
3617                         // Only update pages that expired due to dynamic content and NOT due to edits
3618                         // to referenced templates/files. When the cache expires due to dynamic content,
3619                         // page_touched is unchanged. We want to avoid triggering redundant jobs due to
3620                         // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
3621                         // template/file edit already triggered recursive RefreshLinksJob jobs.
3622                         if ( $this->getLinksTimestamp() > $this->getTouched() ) {
3623                                 // If a page is uncacheable, do not keep spamming a job for it.
3624                                 // Although it would be de-duplicated, it would still waste I/O.
3625                                 $cache = ObjectCache::getLocalClusterInstance();
3626                                 $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
3627                                 $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
3628                                 if ( $cache->add( $key, time(), $ttl ) ) {
3629                                         JobQueueGroup::singleton()->lazyPush(
3630                                                 RefreshLinksJob::newDynamic( $this->mTitle, $params )
3631                                         );
3632                                 }
3633                         }
3634                 }
3635         }
3636
3637         /**
3638          * Returns a list of updates to be performed when this page is deleted. The
3639          * updates should remove any information about this page from secondary data
3640          * stores such as links tables.
3641          *
3642          * @param Content|null $content Optional Content object for determining the
3643          *   necessary updates.
3644          * @return DeferrableUpdate[]
3645          */
3646         public function getDeletionUpdates( Content $content = null ) {
3647                 if ( !$content ) {
3648                         // load content object, which may be used to determine the necessary updates.
3649                         // XXX: the content may not be needed to determine the updates.
3650                         try {
3651                                 $content = $this->getContent( Revision::RAW );
3652                         } catch ( Exception $ex ) {
3653                                 // If we can't load the content, something is wrong. Perhaps that's why
3654                                 // the user is trying to delete the page, so let's not fail in that case.
3655                                 // Note that doDeleteArticleReal() will already have logged an issue with
3656                                 // loading the content.
3657                         }
3658                 }
3659
3660                 if ( !$content ) {
3661                         $updates = [];
3662                 } else {
3663                         $updates = $content->getDeletionUpdates( $this );
3664                 }
3665
3666                 Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
3667                 return $updates;
3668         }
3669
3670         /**
3671          * Whether this content displayed on this page
3672          * comes from the local database
3673          *
3674          * @since 1.28
3675          * @return bool
3676          */
3677         public function isLocal() {
3678                 return true;
3679         }
3680
3681         /**
3682          * The display name for the site this content
3683          * come from. If a subclass overrides isLocal(),
3684          * this could return something other than the
3685          * current site name
3686          *
3687          * @since 1.28
3688          * @return string
3689          */
3690         public function getWikiDisplayName() {
3691                 global $wgSitename;
3692                 return $wgSitename;
3693         }
3694
3695         /**
3696          * Get the source URL for the content on this page,
3697          * typically the canonical URL, but may be a remote
3698          * link if the content comes from another site
3699          *
3700          * @since 1.28
3701          * @return string
3702          */
3703         public function getSourceURL() {
3704                 return $this->getTitle()->getCanonicalURL();
3705         }
3706
3707         /**
3708          * @param WANObjectCache $cache
3709          * @return string[]
3710          * @since 1.28
3711          */
3712         public function getMutableCacheKeys( WANObjectCache $cache ) {
3713                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
3714
3715                 return $linkCache->getMutableCacheKeys( $cache, $this->getTitle()->getTitleValue() );
3716         }
3717 }