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                 $fields = [
 290                         'page_id',
 291                         'page_namespace',
 292                         'page_title',
 293                         'page_restrictions',
 294                         'page_is_redirect',
 295                         'page_is_new',
 296                         'page_random',
 297                         'page_touched',
 298                         'page_links_updated',
 299                         'page_latest',
 300                         'page_len',
 301                 ];
 302
 303                 if ( $wgContentHandlerUseDB ) {
 304                         $fields[] = 'page_content_model';
 305                 }
 306
 307                 if ( $wgPageLanguageUseDB ) {
 308                         $fields[] = 'page_lang';
 309                 }
 310
 311                 return $fields;
 312         }
 313
 314         /**
 315          * Return the tables, fields, and join conditions to be selected to create
 316          * a new page object.
 317          * @since 1.31
 318          * @return array With three keys:
 319          *   - tables: (string[]) to include in the `$table` to `IDatabase->select()`
 320          *   - fields: (string[]) to include in the `$vars` to `IDatabase->select()`
 321          *   - joins: (array) to include in the `$join_conds` to `IDatabase->select()`
 322          */
 323         public static function getQueryInfo() {
 324                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 325
 326                 $ret = [
 327                         'tables' => [ 'page' ],
 328                         'fields' => [
 329                                 'page_id',
 330                                 'page_namespace',
 331                                 'page_title',
 332                                 'page_restrictions',
 333                                 'page_is_redirect',
 334                                 'page_is_new',
 335                                 'page_random',
 336                                 'page_touched',
 337                                 'page_links_updated',
 338                                 'page_latest',
 339                                 'page_len',
 340                         ],
 341                         'joins' => [],
 342                 ];
 343
 344                 if ( $wgContentHandlerUseDB ) {
 345                         $ret['fields'][] = 'page_content_model';
 346                 }
 347
 348                 if ( $wgPageLanguageUseDB ) {
 349                         $ret['fields'][] = 'page_lang';
 350                 }
 351
 352                 return $ret;
 353         }
 354
 355         /**
 356          * Fetch a page record with the given conditions
 357          * @param IDatabase $dbr
 358          * @param array $conditions
 359          * @param array $options
 360          * @return object|bool Database result resource, or false on failure
 361          */
 362         protected function pageData( $dbr, $conditions, $options = [] ) {
 363                 $pageQuery = self::getQueryInfo();
 364
 365                 // Avoid PHP 7.1 warning of passing $this by reference
 366                 $wikiPage = $this;
 367
 368                 Hooks::run( 'ArticlePageDataBefore', [
 369                         &$wikiPage, &$pageQuery['fields'], &$pageQuery['tables'], &$pageQuery['joins']
 370                 ] );
 371
 372                 $row = $dbr->selectRow(
 373                         $pageQuery['tables'],
 374                         $pageQuery['fields'],
 375                         $conditions,
 376                         __METHOD__,
 377                         $options,
 378                         $pageQuery['joins']
 379                 );
 380
 381                 Hooks::run( 'ArticlePageDataAfter', [ &$wikiPage, &$row ] );
 382
 383                 return $row;
 384         }
 385
 386         /**
 387          * Fetch a page record matching the Title object's namespace and title
 388          * using a sanitized title string
 389          *
 390          * @param IDatabase $dbr
 391          * @param Title $title
 392          * @param array $options
 393          * @return object|bool Database result resource, or false on failure
 394          */
 395         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
 396                 return $this->pageData( $dbr, [
 397                         'page_namespace' => $title->getNamespace(),
 398                         'page_title' => $title->getDBkey() ], $options );
 399         }
 400
 401         /**
 402          * Fetch a page record matching the requested ID
 403          *
 404          * @param IDatabase $dbr
 405          * @param int $id
 406          * @param array $options
 407          * @return object|bool Database result resource, or false on failure
 408          */
 409         public function pageDataFromId( $dbr, $id, $options = [] ) {
 410                 return $this->pageData( $dbr, [ 'page_id' => $id ], $options );
 411         }
 412
 413         /**
 414          * Load the object from a given source by title
 415          *
 416          * @param object|string|int $from One of the following:
 417          *   - A DB query result object.
 418          *   - "fromdb" or WikiPage::READ_NORMAL to get from a replica DB.
 419          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 420          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 421          *     using SELECT FOR UPDATE.
 422          *
 423          * @return void
 424          */
 425         public function loadPageData( $from = 'fromdb' ) {
 426                 $from = self::convertSelectType( $from );
 427                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 428                         // We already have the data from the correct location, no need to load it twice.
 429                         return;
 430                 }
 431
 432                 if ( is_int( $from ) ) {
 433                         list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 434                         $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 435                         $loadBalancer = MediaWikiServices::getInstance()->getDBLoadBalancer();
 436
 437                         if ( !$data
 438                                 && $index == DB_REPLICA
 439                                 && $loadBalancer->getServerCount() > 1
 440                                 && $loadBalancer->hasOrMadeRecentMasterChanges()
 441                         ) {
 442                                 $from = self::READ_LATEST;
 443                                 list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 444                                 $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 445                         }
 446                 } else {
 447                         // No idea from where the caller got this data, assume replica DB.
 448                         $data = $from;
 449                         $from = self::READ_NORMAL;
 450                 }
 451
 452                 $this->loadFromRow( $data, $from );
 453         }
 454
 455         /**
 456          * Load the object from a database row
 457          *
 458          * @since 1.20
 459          * @param object|bool $data DB row containing fields returned by selectFields() or false
 460          * @param string|int $from One of the following:
 461          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a replica DB
 462          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 463          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 464          *          the master DB using SELECT FOR UPDATE
 465          */
 466         public function loadFromRow( $data, $from ) {
 467                 $lc = LinkCache::singleton();
 468                 $lc->clearLink( $this->mTitle );
 469
 470                 if ( $data ) {
 471                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 472
 473                         $this->mTitle->loadFromRow( $data );
 474
 475                         // Old-fashioned restrictions
 476                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 477
 478                         $this->mId = intval( $data->page_id );
 479                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 480                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 481                         $this->mIsRedirect = intval( $data->page_is_redirect );
 482                         $this->mLatest = intval( $data->page_latest );
 483                         // T39225: $latest may no longer match the cached latest Revision object.
 484                         // Double-check the ID of any cached latest Revision object for consistency.
 485                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 486                                 $this->mLastRevision = null;
 487                                 $this->mTimestamp = '';
 488                         }
 489                 } else {
 490                         $lc->addBadLinkObj( $this->mTitle );
 491
 492                         $this->mTitle->loadFromRow( false );
 493
 494                         $this->clearCacheFields();
 495
 496                         $this->mId = 0;
 497                 }
 498
 499                 $this->mDataLoaded = true;
 500                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 501         }
 502
 503         /**
 504          * @return int Page ID
 505          */
 506         public function getId() {
 507                 if ( !$this->mDataLoaded ) {
 508                         $this->loadPageData();
 509                 }
 510                 return $this->mId;
 511         }
 512
 513         /**
 514          * @return bool Whether or not the page exists in the database
 515          */
 516         public function exists() {
 517                 if ( !$this->mDataLoaded ) {
 518                         $this->loadPageData();
 519                 }
 520                 return $this->mId > 0;
 521         }
 522
 523         /**
 524          * Check if this page is something we're going to be showing
 525          * some sort of sensible content for. If we return false, page
 526          * views (plain action=view) will return an HTTP 404 response,
 527          * so spiders and robots can know they're following a bad link.
 528          *
 529          * @return bool
 530          */
 531         public function hasViewableContent() {
 532                 return $this->mTitle->isKnown();
 533         }
 534
 535         /**
 536          * Tests if the article content represents a redirect
 537          *
 538          * @return bool
 539          */
 540         public function isRedirect() {
 541                 if ( !$this->mDataLoaded ) {
 542                         $this->loadPageData();
 543                 }
 544
 545                 return (bool)$this->mIsRedirect;
 546         }
 547
 548         /**
 549          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 550          *
 551          * Will use the revisions actual content model if the page exists,
 552          * and the page's default if the page doesn't exist yet.
 553          *
 554          * @return string
 555          *
 556          * @since 1.21
 557          */
 558         public function getContentModel() {
 559                 if ( $this->exists() ) {
 560                         $cache = ObjectCache::getMainWANInstance();
 561
 562                         return $cache->getWithSetCallback(
 563                                 $cache->makeKey( 'page-content-model', $this->getLatest() ),
 564                                 $cache::TTL_MONTH,
 565                                 function () {
 566                                         $rev = $this->getRevision();
 567                                         if ( $rev ) {
 568                                                 // Look at the revision's actual content model
 569                                                 return $rev->getContentModel();
 570                                         } else {
 571                                                 $title = $this->mTitle->getPrefixedDBkey();
 572                                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 573                                                 return $this->mTitle->getContentModel();
 574                                         }
 575                                 }
 576                         );
 577                 }
 578
 579                 // use the default model for this page
 580                 return $this->mTitle->getContentModel();
 581         }
 582
 583         /**
 584          * Loads page_touched and returns a value indicating if it should be used
 585          * @return bool True if this page exists and is not a redirect
 586          */
 587         public function checkTouched() {
 588                 if ( !$this->mDataLoaded ) {
 589                         $this->loadPageData();
 590                 }
 591                 return ( $this->mId && !$this->mIsRedirect );
 592         }
 593
 594         /**
 595          * Get the page_touched field
 596          * @return string Containing GMT timestamp
 597          */
 598         public function getTouched() {
 599                 if ( !$this->mDataLoaded ) {
 600                         $this->loadPageData();
 601                 }
 602                 return $this->mTouched;
 603         }
 604
 605         /**
 606          * Get the page_links_updated field
 607          * @return string|null Containing GMT timestamp
 608          */
 609         public function getLinksTimestamp() {
 610                 if ( !$this->mDataLoaded ) {
 611                         $this->loadPageData();
 612                 }
 613                 return $this->mLinksUpdated;
 614         }
 615
 616         /**
 617          * Get the page_latest field
 618          * @return int The rev_id of current revision
 619          */
 620         public function getLatest() {
 621                 if ( !$this->mDataLoaded ) {
 622                         $this->loadPageData();
 623                 }
 624                 return (int)$this->mLatest;
 625         }
 626
 627         /**
 628          * Get the Revision object of the oldest revision
 629          * @return Revision|null
 630          */
 631         public function getOldestRevision() {
 632                 // Try using the replica DB first, then try the master
 633                 $rev = $this->mTitle->getFirstRevision();
 634                 if ( !$rev ) {
 635                         $rev = $this->mTitle->getFirstRevision( Title::GAID_FOR_UPDATE );
 636                 }
 637                 return $rev;
 638         }
 639
 640         /**
 641          * Loads everything except the text
 642          * This isn't necessary for all uses, so it's only done if needed.
 643          */
 644         protected function loadLastEdit() {
 645                 if ( $this->mLastRevision !== null ) {
 646                         return; // already loaded
 647                 }
 648
 649                 $latest = $this->getLatest();
 650                 if ( !$latest ) {
 651                         return; // page doesn't exist or is missing page_latest info
 652                 }
 653
 654                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 655                         // T39225: if session S1 loads the page row FOR UPDATE, the result always
 656                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 657                         // transactions, where S1 normally only sees changes committed before the first S1
 658                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 659                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 660                         // happened after the first S1 SELECT.
 661                         // https://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
 662                         $flags = Revision::READ_LOCKING;
 663                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 664                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 665                         // Bug T93976: if page_latest was loaded from the master, fetch the
 666                         // revision from there as well, as it may not exist yet on a replica DB.
 667                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 668                         $flags = Revision::READ_LATEST;
 669                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 670                 } else {
 671                         $dbr = wfGetDB( DB_REPLICA );
 672                         $revision = Revision::newKnownCurrent( $dbr, $this->getId(), $latest );
 673                 }
 674
 675                 if ( $revision ) { // sanity
 676                         $this->setLastEdit( $revision );
 677                 }
 678         }
 679
 680         /**
 681          * Set the latest revision
 682          * @param Revision $revision
 683          */
 684         protected function setLastEdit( Revision $revision ) {
 685                 $this->mLastRevision = $revision;
 686                 $this->mTimestamp = $revision->getTimestamp();
 687         }
 688
 689         /**
 690          * Get the latest revision
 691          * @return Revision|null
 692          */
 693         public function getRevision() {
 694                 $this->loadLastEdit();
 695                 if ( $this->mLastRevision ) {
 696                         return $this->mLastRevision;
 697                 }
 698                 return null;
 699         }
 700
 701         /**
 702          * Get the content of the current revision. No side-effects...
 703          *
 704          * @param int $audience One of:
 705          *   Revision::FOR_PUBLIC       to be displayed to all users
 706          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 707          *   Revision::RAW              get the text regardless of permissions
 708          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 709          *   to the $audience parameter
 710          * @return Content|null The content of the current revision
 711          *
 712          * @since 1.21
 713          */
 714         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 715                 $this->loadLastEdit();
 716                 if ( $this->mLastRevision ) {
 717                         return $this->mLastRevision->getContent( $audience, $user );
 718                 }
 719                 return null;
 720         }
 721
 722         /**
 723          * @return string MW timestamp of last article revision
 724          */
 725         public function getTimestamp() {
 726                 // Check if the field has been filled by WikiPage::setTimestamp()
 727                 if ( !$this->mTimestamp ) {
 728                         $this->loadLastEdit();
 729                 }
 730
 731                 return wfTimestamp( TS_MW, $this->mTimestamp );
 732         }
 733
 734         /**
 735          * Set the page timestamp (use only to avoid DB queries)
 736          * @param string $ts MW timestamp of last article revision
 737          * @return void
 738          */
 739         public function setTimestamp( $ts ) {
 740                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 741         }
 742
 743         /**
 744          * @param int $audience One of:
 745          *   Revision::FOR_PUBLIC       to be displayed to all users
 746          *   Revision::FOR_THIS_USER    to be displayed to the given user
 747          *   Revision::RAW              get the text regardless of permissions
 748          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 749          *   to the $audience parameter
 750          * @return int User ID for the user that made the last article revision
 751          */
 752         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 753                 $this->loadLastEdit();
 754                 if ( $this->mLastRevision ) {
 755                         return $this->mLastRevision->getUser( $audience, $user );
 756                 } else {
 757                         return -1;
 758                 }
 759         }
 760
 761         /**
 762          * Get the User object of the user who created the page
 763          * @param int $audience One of:
 764          *   Revision::FOR_PUBLIC       to be displayed to all users
 765          *   Revision::FOR_THIS_USER    to be displayed to the given user
 766          *   Revision::RAW              get the text regardless of permissions
 767          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 768          *   to the $audience parameter
 769          * @return User|null
 770          */
 771         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 772                 $revision = $this->getOldestRevision();
 773                 if ( $revision ) {
 774                         $userName = $revision->getUserText( $audience, $user );
 775                         return User::newFromName( $userName, false );
 776                 } else {
 777                         return null;
 778                 }
 779         }
 780
 781         /**
 782          * @param int $audience One of:
 783          *   Revision::FOR_PUBLIC       to be displayed to all users
 784          *   Revision::FOR_THIS_USER    to be displayed to the given user
 785          *   Revision::RAW              get the text regardless of permissions
 786          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 787          *   to the $audience parameter
 788          * @return string Username of the user that made the last article revision
 789          */
 790         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 791                 $this->loadLastEdit();
 792                 if ( $this->mLastRevision ) {
 793                         return $this->mLastRevision->getUserText( $audience, $user );
 794                 } else {
 795                         return '';
 796                 }
 797         }
 798
 799         /**
 800          * @param int $audience One of:
 801          *   Revision::FOR_PUBLIC       to be displayed to all users
 802          *   Revision::FOR_THIS_USER    to be displayed to the given user
 803          *   Revision::RAW              get the text regardless of permissions
 804          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 805          *   to the $audience parameter
 806          * @return string Comment stored for the last article revision
 807          */
 808         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 809                 $this->loadLastEdit();
 810                 if ( $this->mLastRevision ) {
 811                         return $this->mLastRevision->getComment( $audience, $user );
 812                 } else {
 813                         return '';
 814                 }
 815         }
 816
 817         /**
 818          * Returns true if last revision was marked as "minor edit"
 819          *
 820          * @return bool Minor edit indicator for the last article revision.
 821          */
 822         public function getMinorEdit() {
 823                 $this->loadLastEdit();
 824                 if ( $this->mLastRevision ) {
 825                         return $this->mLastRevision->isMinor();
 826                 } else {
 827                         return false;
 828                 }
 829         }
 830
 831         /**
 832          * Determine whether a page would be suitable for being counted as an
 833          * article in the site_stats table based on the title & its content
 834          *
 835          * @param PreparedEdit|bool $editInfo (false): object returned by prepareTextForEdit(),
 836          *   if false, the current database state will be used
 837          * @return bool
 838          */
 839         public function isCountable( $editInfo = false ) {
 840                 global $wgArticleCountMethod;
 841
 842                 if ( !$this->mTitle->isContentPage() ) {
 843                         return false;
 844                 }
 845
 846                 if ( $editInfo ) {
 847                         $content = $editInfo->pstContent;
 848                 } else {
 849                         $content = $this->getContent();
 850                 }
 851
 852                 if ( !$content || $content->isRedirect() ) {
 853                         return false;
 854                 }
 855
 856                 $hasLinks = null;
 857
 858                 if ( $wgArticleCountMethod === 'link' ) {
 859                         // nasty special case to avoid re-parsing to detect links
 860
 861                         if ( $editInfo ) {
 862                                 // ParserOutput::getLinks() is a 2D array of page links, so
 863                                 // to be really correct we would need to recurse in the array
 864                                 // but the main array should only have items in it if there are
 865                                 // links.
 866                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 867                         } else {
 868                                 $hasLinks = (bool)wfGetDB( DB_REPLICA )->selectField( 'pagelinks', 1,
 869                                         [ 'pl_from' => $this->getId() ], __METHOD__ );
 870                         }
 871                 }
 872
 873                 return $content->isCountable( $hasLinks );
 874         }
 875
 876         /**
 877          * If this page is a redirect, get its target
 878          *
 879          * The target will be fetched from the redirect table if possible.
 880          * If this page doesn't have an entry there, call insertRedirect()
 881          * @return Title|null Title object, or null if this page is not a redirect
 882          */
 883         public function getRedirectTarget() {
 884                 if ( !$this->mTitle->isRedirect() ) {
 885                         return null;
 886                 }
 887
 888                 if ( $this->mRedirectTarget !== null ) {
 889                         return $this->mRedirectTarget;
 890                 }
 891
 892                 // Query the redirect table
 893                 $dbr = wfGetDB( DB_REPLICA );
 894                 $row = $dbr->selectRow( 'redirect',
 895                         [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ],
 896                         [ 'rd_from' => $this->getId() ],
 897                         __METHOD__
 898                 );
 899
 900                 // rd_fragment and rd_interwiki were added later, populate them if empty
 901                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 902                         $this->mRedirectTarget = Title::makeTitle(
 903                                 $row->rd_namespace, $row->rd_title,
 904                                 $row->rd_fragment, $row->rd_interwiki
 905                         );
 906                         return $this->mRedirectTarget;
 907                 }
 908
 909                 // This page doesn't have an entry in the redirect table
 910                 $this->mRedirectTarget = $this->insertRedirect();
 911                 return $this->mRedirectTarget;
 912         }
 913
 914         /**
 915          * Insert an entry for this page into the redirect table if the content is a redirect
 916          *
 917          * The database update will be deferred via DeferredUpdates
 918          *
 919          * Don't call this function directly unless you know what you're doing.
 920          * @return Title|null Title object or null if not a redirect
 921          */
 922         public function insertRedirect() {
 923                 $content = $this->getContent();
 924                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 925                 if ( !$retval ) {
 926                         return null;
 927                 }
 928
 929                 // Update the DB post-send if the page has not cached since now
 930                 $latest = $this->getLatest();
 931                 DeferredUpdates::addCallableUpdate(
 932                         function () use ( $retval, $latest ) {
 933                                 $this->insertRedirectEntry( $retval, $latest );
 934                         },
 935                         DeferredUpdates::POSTSEND,
 936                         wfGetDB( DB_MASTER )
 937                 );
 938
 939                 return $retval;
 940         }
 941
 942         /**
 943          * Insert or update the redirect table entry for this page to indicate it redirects to $rt
 944          * @param Title $rt Redirect target
 945          * @param int|null $oldLatest Prior page_latest for check and set
 946          */
 947         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
 948                 $dbw = wfGetDB( DB_MASTER );
 949                 $dbw->startAtomic( __METHOD__ );
 950
 951                 if ( !$oldLatest || $oldLatest == $this->lockAndGetLatest() ) {
 952                         $dbw->upsert(
 953                                 'redirect',
 954                                 [
 955                                         'rd_from' => $this->getId(),
 956                                         'rd_namespace' => $rt->getNamespace(),
 957                                         'rd_title' => $rt->getDBkey(),
 958                                         'rd_fragment' => $rt->getFragment(),
 959                                         'rd_interwiki' => $rt->getInterwiki(),
 960                                 ],
 961                                 [ 'rd_from' ],
 962                                 [
 963                                         'rd_namespace' => $rt->getNamespace(),
 964                                         'rd_title' => $rt->getDBkey(),
 965                                         'rd_fragment' => $rt->getFragment(),
 966                                         'rd_interwiki' => $rt->getInterwiki(),
 967                                 ],
 968                                 __METHOD__
 969                         );
 970                 }
 971
 972                 $dbw->endAtomic( __METHOD__ );
 973         }
 974
 975         /**
 976          * Get the Title object or URL this page redirects to
 977          *
 978          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 979          */
 980         public function followRedirect() {
 981                 return $this->getRedirectURL( $this->getRedirectTarget() );
 982         }
 983
 984         /**
 985          * Get the Title object or URL to use for a redirect. We use Title
 986          * objects for same-wiki, non-special redirects and URLs for everything
 987          * else.
 988          * @param Title $rt Redirect target
 989          * @return bool|Title|string False, Title object of local target, or string with URL
 990          */
 991         public function getRedirectURL( $rt ) {
 992                 if ( !$rt ) {
 993                         return false;
 994                 }
 995
 996                 if ( $rt->isExternal() ) {
 997                         if ( $rt->isLocal() ) {
 998                                 // Offsite wikis need an HTTP redirect.
 999                                 // This can be hard to reverse and may produce loops,
1000                                 // so they may be disabled in the site configuration.
1001                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
1002                                 return $rt->getFullURL( [ 'rdfrom' => $source ] );
1003                         } else {
1004                                 // External pages without "local" bit set are not valid
1005                                 // redirect targets
1006                                 return false;
1007                         }
1008                 }
1009
1010                 if ( $rt->isSpecialPage() ) {
1011                         // Gotta handle redirects to special pages differently:
1012                         // Fill the HTTP response "Location" header and ignore the rest of the page we're on.
1013                         // Some pages are not valid targets.
1014                         if ( $rt->isValidRedirectTarget() ) {
1015                                 return $rt->getFullURL();
1016                         } else {
1017                                 return false;
1018                         }
1019                 }
1020
1021                 return $rt;
1022         }
1023
1024         /**
1025          * Get a list of users who have edited this article, not including the user who made
1026          * the most recent revision, which you can get from $article->getUser() if you want it
1027          * @return UserArrayFromResult
1028          */
1029         public function getContributors() {
1030                 // @todo FIXME: This is expensive; cache this info somewhere.
1031
1032                 $dbr = wfGetDB( DB_REPLICA );
1033
1034                 $tables = [ 'revision', 'user' ];
1035
1036                 $fields = [
1037                         'user_id' => 'rev_user',
1038                         'user_name' => 'rev_user_text',
1039                         'user_real_name' => 'MIN(user_real_name)',
1040                         'timestamp' => 'MAX(rev_timestamp)',
1041                 ];
1042
1043                 $conds = [ 'rev_page' => $this->getId() ];
1044
1045                 // The user who made the top revision gets credited as "this page was last edited by
1046                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1047                 $user = $this->getUser();
1048                 if ( $user ) {
1049                         $conds[] = "rev_user != $user";
1050                 } else {
1051                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1052                 }
1053
1054                 // Username hidden?
1055                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0";
1056
1057                 $jconds = [
1058                         'user' => [ 'LEFT JOIN', 'rev_user = user_id' ],
1059                 ];
1060
1061                 $options = [
1062                         'GROUP BY' => [ 'rev_user', 'rev_user_text' ],
1063                         'ORDER BY' => 'timestamp DESC',
1064                 ];
1065
1066                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1067                 return new UserArrayFromResult( $res );
1068         }
1069
1070         /**
1071          * Should the parser cache be used?
1072          *
1073          * @param ParserOptions $parserOptions ParserOptions to check
1074          * @param int $oldId
1075          * @return bool
1076          */
1077         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
1078                 return $parserOptions->getStubThreshold() == 0
1079                         && $this->exists()
1080                         && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
1081                         && $this->getContentHandler()->isParserCacheSupported();
1082         }
1083
1084         /**
1085          * Get a ParserOutput for the given ParserOptions and revision ID.
1086          *
1087          * The parser cache will be used if possible. Cache misses that result
1088          * in parser runs are debounced with PoolCounter.
1089          *
1090          * @since 1.19
1091          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1092          * @param null|int $oldid Revision ID to get the text from, passing null or 0 will
1093          *   get the current revision (default value)
1094          * @param bool $forceParse Force reindexing, regardless of cache settings
1095          * @return bool|ParserOutput ParserOutput or false if the revision was not found
1096          */
1097         public function getParserOutput(
1098                 ParserOptions $parserOptions, $oldid = null, $forceParse = false
1099         ) {
1100                 $useParserCache =
1101                         ( !$forceParse ) && $this->shouldCheckParserCache( $parserOptions, $oldid );
1102
1103                 if ( $useParserCache && !$parserOptions->isSafeToCache() ) {
1104                         throw new InvalidArgumentException(
1105                                 'The supplied ParserOptions are not safe to cache. Fix the options or set $forceParse = true.'
1106                         );
1107                 }
1108
1109                 wfDebug( __METHOD__ .
1110                         ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1111                 if ( $parserOptions->getStubThreshold() ) {
1112                         wfIncrStats( 'pcache.miss.stub' );
1113                 }
1114
1115                 if ( $useParserCache ) {
1116                         $parserOutput = MediaWikiServices::getInstance()->getParserCache()
1117                                 ->get( $this, $parserOptions );
1118                         if ( $parserOutput !== false ) {
1119                                 return $parserOutput;
1120                         }
1121                 }
1122
1123                 if ( $oldid === null || $oldid === 0 ) {
1124                         $oldid = $this->getLatest();
1125                 }
1126
1127                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1128                 $pool->execute();
1129
1130                 return $pool->getParserOutput();
1131         }
1132
1133         /**
1134          * Do standard deferred updates after page view (existing or missing page)
1135          * @param User $user The relevant user
1136          * @param int $oldid Revision id being viewed; if not given or 0, latest revision is assumed
1137          */
1138         public function doViewUpdates( User $user, $oldid = 0 ) {
1139                 if ( wfReadOnly() ) {
1140                         return;
1141                 }
1142
1143                 Hooks::run( 'PageViewUpdates', [ $this, $user ] );
1144                 // Update newtalk / watchlist notification status
1145                 try {
1146                         $user->clearNotification( $this->mTitle, $oldid );
1147                 } catch ( DBError $e ) {
1148                         // Avoid outage if the master is not reachable
1149                         MWExceptionHandler::logException( $e );
1150                 }
1151         }
1152
1153         /**
1154          * Perform the actions of a page purging
1155          * @return bool
1156          * @note In 1.28 (and only 1.28), this took a $flags parameter that
1157          *  controlled how much purging was done.
1158          */
1159         public function doPurge() {
1160                 // Avoid PHP 7.1 warning of passing $this by reference
1161                 $wikiPage = $this;
1162
1163                 if ( !Hooks::run( 'ArticlePurge', [ &$wikiPage ] ) ) {
1164                         return false;
1165                 }
1166
1167                 $this->mTitle->invalidateCache();
1168
1169                 // Clear file cache
1170                 HTMLFileCache::clearFileCache( $this->getTitle() );
1171                 // Send purge after above page_touched update was committed
1172                 DeferredUpdates::addUpdate(
1173                         new CdnCacheUpdate( $this->mTitle->getCdnUrls() ),
1174                         DeferredUpdates::PRESEND
1175                 );
1176
1177                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1178                         $messageCache = MessageCache::singleton();
1179                         $messageCache->updateMessageOverride( $this->mTitle, $this->getContent() );
1180                 }
1181
1182                 return true;
1183         }
1184
1185         /**
1186          * Insert a new empty page record for this article.
1187          * This *must* be followed up by creating a revision
1188          * and running $this->updateRevisionOn( ... );
1189          * or else the record will be left in a funky state.
1190          * Best if all done inside a transaction.
1191          *
1192          * @param IDatabase $dbw
1193          * @param int|null $pageId Custom page ID that will be used for the insert statement
1194          *
1195          * @return bool|int The newly created page_id key; false if the row was not
1196          *   inserted, e.g. because the title already existed or because the specified
1197          *   page ID is already in use.
1198          */
1199         public function insertOn( $dbw, $pageId = null ) {
1200                 $pageIdForInsert = $pageId ? [ 'page_id' => $pageId ] : [];
1201                 $dbw->insert(
1202                         'page',
1203                         [
1204                                 'page_namespace'    => $this->mTitle->getNamespace(),
1205                                 'page_title'        => $this->mTitle->getDBkey(),
1206                                 'page_restrictions' => '',
1207                                 'page_is_redirect'  => 0, // Will set this shortly...
1208                                 'page_is_new'       => 1,
1209                                 'page_random'       => wfRandom(),
1210                                 'page_touched'      => $dbw->timestamp(),
1211                                 'page_latest'       => 0, // Fill this in shortly...
1212                                 'page_len'          => 0, // Fill this in shortly...
1213                         ] + $pageIdForInsert,
1214                         __METHOD__,
1215                         'IGNORE'
1216                 );
1217
1218                 if ( $dbw->affectedRows() > 0 ) {
1219                         $newid = $pageId ? (int)$pageId : $dbw->insertId();
1220                         $this->mId = $newid;
1221                         $this->mTitle->resetArticleID( $newid );
1222
1223                         return $newid;
1224                 } else {
1225                         return false; // nothing changed
1226                 }
1227         }
1228
1229         /**
1230          * Update the page record to point to a newly saved revision.
1231          *
1232          * @param IDatabase $dbw
1233          * @param Revision $revision For ID number, and text used to set
1234          *   length and redirect status fields
1235          * @param int $lastRevision If given, will not overwrite the page field
1236          *   when different from the currently set value.
1237          *   Giving 0 indicates the new page flag should be set on.
1238          * @param bool $lastRevIsRedirect If given, will optimize adding and
1239          *   removing rows in redirect table.
1240          * @return bool Success; false if the page row was missing or page_latest changed
1241          */
1242         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1243                 $lastRevIsRedirect = null
1244         ) {
1245                 global $wgContentHandlerUseDB;
1246
1247                 // Assertion to try to catch T92046
1248                 if ( (int)$revision->getId() === 0 ) {
1249                         throw new InvalidArgumentException(
1250                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1251                         );
1252                 }
1253
1254                 $content = $revision->getContent();
1255                 $len = $content ? $content->getSize() : 0;
1256                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1257
1258                 $conditions = [ 'page_id' => $this->getId() ];
1259
1260                 if ( !is_null( $lastRevision ) ) {
1261                         // An extra check against threads stepping on each other
1262                         $conditions['page_latest'] = $lastRevision;
1263                 }
1264
1265                 $row = [ /* SET */
1266                         'page_latest'      => $revision->getId(),
1267                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1268                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1269                         'page_is_redirect' => $rt !== null ? 1 : 0,
1270                         'page_len'         => $len,
1271                 ];
1272
1273                 if ( $wgContentHandlerUseDB ) {
1274                         $row['page_content_model'] = $revision->getContentModel();
1275                 }
1276
1277                 $dbw->update( 'page',
1278                         $row,
1279                         $conditions,
1280                         __METHOD__ );
1281
1282                 $result = $dbw->affectedRows() > 0;
1283                 if ( $result ) {
1284                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1285                         $this->setLastEdit( $revision );
1286                         $this->mLatest = $revision->getId();
1287                         $this->mIsRedirect = (bool)$rt;
1288                         // Update the LinkCache.
1289                         LinkCache::singleton()->addGoodLinkObj(
1290                                 $this->getId(),
1291                                 $this->mTitle,
1292                                 $len,
1293                                 $this->mIsRedirect,
1294                                 $this->mLatest,
1295                                 $revision->getContentModel()
1296                         );
1297                 }
1298
1299                 return $result;
1300         }
1301
1302         /**
1303          * Add row to the redirect table if this is a redirect, remove otherwise.
1304          *
1305          * @param IDatabase $dbw
1306          * @param Title $redirectTitle Title object pointing to the redirect target,
1307          *   or NULL if this is not a redirect
1308          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1309          *   removing rows in redirect table.
1310          * @return bool True on success, false on failure
1311          * @private
1312          */
1313         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1314                 // Always update redirects (target link might have changed)
1315                 // Update/Insert if we don't know if the last revision was a redirect or not
1316                 // Delete if changing from redirect to non-redirect
1317                 $isRedirect = !is_null( $redirectTitle );
1318
1319                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1320                         return true;
1321                 }
1322
1323                 if ( $isRedirect ) {
1324                         $this->insertRedirectEntry( $redirectTitle );
1325                 } else {
1326                         // This is not a redirect, remove row from redirect table
1327                         $where = [ 'rd_from' => $this->getId() ];
1328                         $dbw->delete( 'redirect', $where, __METHOD__ );
1329                 }
1330
1331                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1332                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1333                 }
1334
1335                 return ( $dbw->affectedRows() != 0 );
1336         }
1337
1338         /**
1339          * If the given revision is newer than the currently set page_latest,
1340          * update the page record. Otherwise, do nothing.
1341          *
1342          * @deprecated since 1.24, use updateRevisionOn instead
1343          *
1344          * @param IDatabase $dbw
1345          * @param Revision $revision
1346          * @return bool
1347          */
1348         public function updateIfNewerOn( $dbw, $revision ) {
1349                 $row = $dbw->selectRow(
1350                         [ 'revision', 'page' ],
1351                         [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
1352                         [
1353                                 'page_id' => $this->getId(),
1354                                 'page_latest=rev_id' ],
1355                         __METHOD__ );
1356
1357                 if ( $row ) {
1358                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1359                                 return false;
1360                         }
1361                         $prev = $row->rev_id;
1362                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1363                 } else {
1364                         // No or missing previous revision; mark the page as new
1365                         $prev = 0;
1366                         $lastRevIsRedirect = null;
1367                 }
1368
1369                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1370
1371                 return $ret;
1372         }
1373
1374         /**
1375          * Get the content that needs to be saved in order to undo all revisions
1376          * between $undo and $undoafter. Revisions must belong to the same page,
1377          * must exist and must not be deleted
1378          * @param Revision $undo
1379          * @param Revision $undoafter Must be an earlier revision than $undo
1380          * @return Content|bool Content on success, false on failure
1381          * @since 1.21
1382          * Before we had the Content object, this was done in getUndoText
1383          */
1384         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1385                 $handler = $undo->getContentHandler();
1386                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1387         }
1388
1389         /**
1390          * Returns true if this page's content model supports sections.
1391          *
1392          * @return bool
1393          *
1394          * @todo The skin should check this and not offer section functionality if
1395          *   sections are not supported.
1396          * @todo The EditPage should check this and not offer section functionality
1397          *   if sections are not supported.
1398          */
1399         public function supportsSections() {
1400                 return $this->getContentHandler()->supportsSections();
1401         }
1402
1403         /**
1404          * @param string|int|null|bool $sectionId Section identifier as a number or string
1405          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1406          * or 'new' for a new section.
1407          * @param Content $sectionContent New content of the section.
1408          * @param string $sectionTitle New section's subject, only if $section is "new".
1409          * @param string $edittime Revision timestamp or null to use the current revision.
1410          *
1411          * @throws MWException
1412          * @return Content|null New complete article content, or null if error.
1413          *
1414          * @since 1.21
1415          * @deprecated since 1.24, use replaceSectionAtRev instead
1416          */
1417         public function replaceSectionContent(
1418                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
1419         ) {
1420                 $baseRevId = null;
1421                 if ( $edittime && $sectionId !== 'new' ) {
1422                         $dbr = wfGetDB( DB_REPLICA );
1423                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1424                         // Try the master if this thread may have just added it.
1425                         // This could be abstracted into a Revision method, but we don't want
1426                         // to encourage loading of revisions by timestamp.
1427                         if ( !$rev
1428                                 && wfGetLB()->getServerCount() > 1
1429                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1430                         ) {
1431                                 $dbw = wfGetDB( DB_MASTER );
1432                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1433                         }
1434                         if ( $rev ) {
1435                                 $baseRevId = $rev->getId();
1436                         }
1437                 }
1438
1439                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1440         }
1441
1442         /**
1443          * @param string|int|null|bool $sectionId Section identifier as a number or string
1444          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1445          * or 'new' for a new section.
1446          * @param Content $sectionContent New content of the section.
1447          * @param string $sectionTitle New section's subject, only if $section is "new".
1448          * @param int|null $baseRevId
1449          *
1450          * @throws MWException
1451          * @return Content|null New complete article content, or null if error.
1452          *
1453          * @since 1.24
1454          */
1455         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1456                 $sectionTitle = '', $baseRevId = null
1457         ) {
1458                 if ( strval( $sectionId ) === '' ) {
1459                         // Whole-page edit; let the whole text through
1460                         $newContent = $sectionContent;
1461                 } else {
1462                         if ( !$this->supportsSections() ) {
1463                                 throw new MWException( "sections not supported for content model " .
1464                                         $this->getContentHandler()->getModelID() );
1465                         }
1466
1467                         // T32711: always use current version when adding a new section
1468                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1469                                 $oldContent = $this->getContent();
1470                         } else {
1471                                 $rev = Revision::newFromId( $baseRevId );
1472                                 if ( !$rev ) {
1473                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1474                                                 $this->getId() . "; section: $sectionId)\n" );
1475                                         return null;
1476                                 }
1477
1478                                 $oldContent = $rev->getContent();
1479                         }
1480
1481                         if ( !$oldContent ) {
1482                                 wfDebug( __METHOD__ . ": no page text\n" );
1483                                 return null;
1484                         }
1485
1486                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1487                 }
1488
1489                 return $newContent;
1490         }
1491
1492         /**
1493          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1494          * @param int $flags
1495          * @return int Updated $flags
1496          */
1497         public function checkFlags( $flags ) {
1498                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1499                         if ( $this->exists() ) {
1500                                 $flags |= EDIT_UPDATE;
1501                         } else {
1502                                 $flags |= EDIT_NEW;
1503                         }
1504                 }
1505
1506                 return $flags;
1507         }
1508
1509         /**
1510          * Change an existing article or create a new article. Updates RC and all necessary caches,
1511          * optionally via the deferred update array.
1512          *
1513          * @param Content $content New content
1514          * @param string $summary Edit summary
1515          * @param int $flags Bitfield:
1516          *      EDIT_NEW
1517          *          Article is known or assumed to be non-existent, create a new one
1518          *      EDIT_UPDATE
1519          *          Article is known or assumed to be pre-existing, update it
1520          *      EDIT_MINOR
1521          *          Mark this edit minor, if the user is allowed to do so
1522          *      EDIT_SUPPRESS_RC
1523          *          Do not log the change in recentchanges
1524          *      EDIT_FORCE_BOT
1525          *          Mark the edit a "bot" edit regardless of user rights
1526          *      EDIT_AUTOSUMMARY
1527          *          Fill in blank summaries with generated text where possible
1528          *      EDIT_INTERNAL
1529          *          Signal that the page retrieve/save cycle happened entirely in this request.
1530          *
1531          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1532          * article will be detected. If EDIT_UPDATE is specified and the article
1533          * doesn't exist, the function will return an edit-gone-missing error. If
1534          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1535          * error will be returned. These two conditions are also possible with
1536          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1537          *
1538          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1539          *   This is not the parent revision ID, rather the revision ID for older
1540          *   content used as the source for a rollback, for example.
1541          * @param User $user The user doing the edit
1542          * @param string $serialFormat Format for storing the content in the
1543          *   database.
1544          * @param array|null $tags Change tags to apply to this edit
1545          * Callers are responsible for permission checks
1546          * (with ChangeTags::canAddTagsAccompanyingChange)
1547          * @param Int $undidRevId Id of revision that was undone or 0
1548          *
1549          * @throws MWException
1550          * @return Status Possible errors:
1551          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1552          *       set the fatal flag of $status.
1553          *     edit-gone-missing: In update mode, but the article didn't exist.
1554          *     edit-conflict: In update mode, the article changed unexpectedly.
1555          *     edit-no-change: Warning that the text was the same as before.
1556          *     edit-already-exists: In creation mode, but the article already exists.
1557          *
1558          *  Extensions may define additional errors.
1559          *
1560          *  $return->value will contain an associative array with members as follows:
1561          *     new: Boolean indicating if the function attempted to create a new article.
1562          *     revision: The revision object for the inserted revision, or null.
1563          *
1564          * @since 1.21
1565          * @throws MWException
1566          */
1567         public function doEditContent(
1568                 Content $content, $summary, $flags = 0, $baseRevId = false,
1569                 User $user = null, $serialFormat = null, $tags = [], $undidRevId = 0
1570         ) {
1571                 global $wgUser, $wgUseAutomaticEditSummaries;
1572
1573                 // Old default parameter for $tags was null
1574                 if ( $tags === null ) {
1575                         $tags = [];
1576                 }
1577
1578                 // Low-level sanity check
1579                 if ( $this->mTitle->getText() === '' ) {
1580                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1581                 }
1582                 // Make sure the given content type is allowed for this page
1583                 if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
1584                         return Status::newFatal( 'content-not-allowed-here',
1585                                 ContentHandler::getLocalizedName( $content->getModel() ),
1586                                 $this->mTitle->getPrefixedText()
1587                         );
1588                 }
1589
1590                 // Load the data from the master database if needed.
1591                 // The caller may already loaded it from the master or even loaded it using
1592                 // SELECT FOR UPDATE, so do not override that using clear().
1593                 $this->loadPageData( 'fromdbmaster' );
1594
1595                 $user = $user ?: $wgUser;
1596                 $flags = $this->checkFlags( $flags );
1597
1598                 // Avoid PHP 7.1 warning of passing $this by reference
1599                 $wikiPage = $this;
1600
1601                 // Trigger pre-save hook (using provided edit summary)
1602                 $hookStatus = Status::newGood( [] );
1603                 $hook_args = [ &$wikiPage, &$user, &$content, &$summary,
1604                                                         $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
1605                 // Check if the hook rejected the attempted save
1606                 if ( !Hooks::run( 'PageContentSave', $hook_args ) ) {
1607                         if ( $hookStatus->isOK() ) {
1608                                 // Hook returned false but didn't call fatal(); use generic message
1609                                 $hookStatus->fatal( 'edit-hook-aborted' );
1610                         }
1611
1612                         return $hookStatus;
1613                 }
1614
1615                 $old_revision = $this->getRevision(); // current revision
1616                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1617
1618                 if ( $old_content && $old_content->getModel() !== $content->getModel() ) {
1619                         $tags[] = 'mw-contentmodelchange';
1620                 }
1621
1622                 // Provide autosummaries if one is not provided and autosummaries are enabled
1623                 if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
1624                         $handler = $content->getContentHandler();
1625                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1626                 }
1627
1628                 // Avoid statsd noise and wasted cycles check the edit stash (T136678)
1629                 if ( ( $flags & EDIT_INTERNAL ) || ( $flags & EDIT_FORCE_BOT ) ) {
1630                         $useCache = false;
1631                 } else {
1632                         $useCache = true;
1633                 }
1634
1635                 // Get the pre-save transform content and final parser output
1636                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat, $useCache );
1637                 $pstContent = $editInfo->pstContent; // Content object
1638                 $meta = [
1639                         'bot' => ( $flags & EDIT_FORCE_BOT ),
1640                         'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
1641                         'serialized' => $pstContent->serialize( $serialFormat ),
1642                         'serialFormat' => $serialFormat,
1643                         'baseRevId' => $baseRevId,
1644                         'oldRevision' => $old_revision,
1645                         'oldContent' => $old_content,
1646                         'oldId' => $this->getLatest(),
1647                         'oldIsRedirect' => $this->isRedirect(),
1648                         'oldCountable' => $this->isCountable(),
1649                         'tags' => ( $tags !== null ) ? (array)$tags : [],
1650                         'undidRevId' => $undidRevId
1651                 ];
1652
1653                 // Actually create the revision and create/update the page
1654                 if ( $flags & EDIT_UPDATE ) {
1655                         $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
1656                 } else {
1657                         $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
1658                 }
1659
1660                 // Promote user to any groups they meet the criteria for
1661                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1662                         $user->addAutopromoteOnceGroups( 'onEdit' );
1663                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1664                 } );
1665
1666                 return $status;
1667         }
1668
1669         /**
1670          * @param Content $content Pre-save transform content
1671          * @param int $flags
1672          * @param User $user
1673          * @param string $summary
1674          * @param array $meta
1675          * @return Status
1676          * @throws DBUnexpectedError
1677          * @throws Exception
1678          * @throws FatalError
1679          * @throws MWException
1680          */
1681         private function doModify(
1682                 Content $content, $flags, User $user, $summary, array $meta
1683         ) {
1684                 global $wgUseRCPatrol;
1685
1686                 // Update article, but only if changed.
1687                 $status = Status::newGood( [ 'new' => false, 'revision' => null ] );
1688
1689                 // Convenience variables
1690                 $now = wfTimestampNow();
1691                 $oldid = $meta['oldId'];
1692                 /** @var Content|null $oldContent */
1693                 $oldContent = $meta['oldContent'];
1694                 $newsize = $content->getSize();
1695
1696                 if ( !$oldid ) {
1697                         // Article gone missing
1698                         $status->fatal( 'edit-gone-missing' );
1699
1700                         return $status;
1701                 } elseif ( !$oldContent ) {
1702                         // Sanity check for T39225
1703                         throw new MWException( "Could not find text for current revision {$oldid}." );
1704                 }
1705
1706                 // @TODO: pass content object?!
1707                 $revision = new Revision( [
1708                         'page'       => $this->getId(),
1709                         'title'      => $this->mTitle, // for determining the default content model
1710                         'comment'    => $summary,
1711                         'minor_edit' => $meta['minor'],
1712                         'text'       => $meta['serialized'],
1713                         'len'        => $newsize,
1714                         'parent_id'  => $oldid,
1715                         'user'       => $user->getId(),
1716                         'user_text'  => $user->getName(),
1717                         'timestamp'  => $now,
1718                         'content_model' => $content->getModel(),
1719                         'content_format' => $meta['serialFormat'],
1720                 ] );
1721
1722                 $changed = !$content->equals( $oldContent );
1723
1724                 $dbw = wfGetDB( DB_MASTER );
1725
1726                 if ( $changed ) {
1727                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1728                         $status->merge( $prepStatus );
1729                         if ( !$status->isOK() ) {
1730                                 return $status;
1731                         }
1732
1733                         $dbw->startAtomic( __METHOD__ );
1734                         // Get the latest page_latest value while locking it.
1735                         // Do a CAS style check to see if it's the same as when this method
1736                         // started. If it changed then bail out before touching the DB.
1737                         $latestNow = $this->lockAndGetLatest();
1738                         if ( $latestNow != $oldid ) {
1739                                 $dbw->endAtomic( __METHOD__ );
1740                                 // Page updated or deleted in the mean time
1741                                 $status->fatal( 'edit-conflict' );
1742
1743                                 return $status;
1744                         }
1745
1746                         // At this point we are now comitted to returning an OK
1747                         // status unless some DB query error or other exception comes up.
1748                         // This way callers don't have to call rollback() if $status is bad
1749                         // unless they actually try to catch exceptions (which is rare).
1750
1751                         // Save the revision text
1752                         $revisionId = $revision->insertOn( $dbw );
1753                         // Update page_latest and friends to reflect the new revision
1754                         if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
1755                                 throw new MWException( "Failed to update page row to use new revision." );
1756                         }
1757
1758                         Hooks::run( 'NewRevisionFromEditComplete',
1759                                 [ $this, $revision, $meta['baseRevId'], $user ] );
1760
1761                         // Update recentchanges
1762                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1763                                 // Mark as patrolled if the user can do so
1764                                 $patrolled = $wgUseRCPatrol && !count(
1765                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1766                                 // Add RC row to the DB
1767                                 RecentChange::notifyEdit(
1768                                         $now,
1769                                         $this->mTitle,
1770                                         $revision->isMinor(),
1771                                         $user,
1772                                         $summary,
1773                                         $oldid,
1774                                         $this->getTimestamp(),
1775                                         $meta['bot'],
1776                                         '',
1777                                         $oldContent ? $oldContent->getSize() : 0,
1778                                         $newsize,
1779                                         $revisionId,
1780                                         $patrolled,
1781                                         $meta['tags']
1782                                 );
1783                         }
1784
1785                         $user->incEditCount();
1786
1787                         $dbw->endAtomic( __METHOD__ );
1788                         $this->mTimestamp = $now;
1789                 } else {
1790                         // T34948: revision ID must be set to page {{REVISIONID}} and
1791                         // related variables correctly. Likewise for {{REVISIONUSER}} (T135261).
1792                         $revision->setId( $this->getLatest() );
1793                         $revision->setUserIdAndName(
1794                                 $this->getUser( Revision::RAW ),
1795                                 $this->getUserText( Revision::RAW )
1796                         );
1797                 }
1798
1799                 if ( $changed ) {
1800                         // Return the new revision to the caller
1801                         $status->value['revision'] = $revision;
1802                 } else {
1803                         $status->warning( 'edit-no-change' );
1804                         // Update page_touched as updateRevisionOn() was not called.
1805                         // Other cache updates are managed in onArticleEdit() via doEditUpdates().
1806                         $this->mTitle->invalidateCache( $now );
1807                 }
1808
1809                 // Do secondary updates once the main changes have been committed...
1810                 DeferredUpdates::addUpdate(
1811                         new AtomicSectionUpdate(
1812                                 $dbw,
1813                                 __METHOD__,
1814                                 function () use (
1815                                         $revision, &$user, $content, $summary, &$flags,
1816                                         $changed, $meta, &$status
1817                                 ) {
1818                                         // Update links tables, site stats, etc.
1819                                         $this->doEditUpdates(
1820                                                 $revision,
1821                                                 $user,
1822                                                 [
1823                                                         'changed' => $changed,
1824                                                         'oldcountable' => $meta['oldCountable'],
1825                                                         'oldrevision' => $meta['oldRevision']
1826                                                 ]
1827                                         );
1828                                         // Avoid PHP 7.1 warning of passing $this by reference
1829                                         $wikiPage = $this;
1830                                         // Trigger post-save hook
1831                                         $params = [ &$wikiPage, &$user, $content, $summary, $flags & EDIT_MINOR,
1832                                                 null, null, &$flags, $revision, &$status, $meta['baseRevId'],
1833                                                 $meta['undidRevId'] ];
1834                                         Hooks::run( 'PageContentSaveComplete', $params );
1835                                 }
1836                         ),
1837                         DeferredUpdates::PRESEND
1838                 );
1839
1840                 return $status;
1841         }
1842
1843         /**
1844          * @param Content $content Pre-save transform content
1845          * @param int $flags
1846          * @param User $user
1847          * @param string $summary
1848          * @param array $meta
1849          * @return Status
1850          * @throws DBUnexpectedError
1851          * @throws Exception
1852          * @throws FatalError
1853          * @throws MWException
1854          */
1855         private function doCreate(
1856                 Content $content, $flags, User $user, $summary, array $meta
1857         ) {
1858                 global $wgUseRCPatrol, $wgUseNPPatrol;
1859
1860                 $status = Status::newGood( [ 'new' => true, 'revision' => null ] );
1861
1862                 $now = wfTimestampNow();
1863                 $newsize = $content->getSize();
1864                 $prepStatus = $content->prepareSave( $this, $flags, $meta['oldId'], $user );
1865                 $status->merge( $prepStatus );
1866                 if ( !$status->isOK() ) {
1867                         return $status;
1868                 }
1869
1870                 $dbw = wfGetDB( DB_MASTER );
1871                 $dbw->startAtomic( __METHOD__ );
1872
1873                 // Add the page record unless one already exists for the title
1874                 $newid = $this->insertOn( $dbw );
1875                 if ( $newid === false ) {
1876                         $dbw->endAtomic( __METHOD__ ); // nothing inserted
1877                         $status->fatal( 'edit-already-exists' );
1878
1879                         return $status; // nothing done
1880                 }
1881
1882                 // At this point we are now comitted to returning an OK
1883                 // status unless some DB query error or other exception comes up.
1884                 // This way callers don't have to call rollback() if $status is bad
1885                 // unless they actually try to catch exceptions (which is rare).
1886
1887                 // @TODO: pass content object?!
1888                 $revision = new Revision( [
1889                         'page'       => $newid,
1890                         'title'      => $this->mTitle, // for determining the default content model
1891                         'comment'    => $summary,
1892                         'minor_edit' => $meta['minor'],
1893                         'text'       => $meta['serialized'],
1894                         'len'        => $newsize,
1895                         'user'       => $user->getId(),
1896                         'user_text'  => $user->getName(),
1897                         'timestamp'  => $now,
1898                         'content_model' => $content->getModel(),
1899                         'content_format' => $meta['serialFormat'],
1900                 ] );
1901
1902                 // Save the revision text...
1903                 $revisionId = $revision->insertOn( $dbw );
1904                 // Update the page record with revision data
1905                 if ( !$this->updateRevisionOn( $dbw, $revision, 0 ) ) {
1906                         throw new MWException( "Failed to update page row to use new revision." );
1907                 }
1908
1909                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
1910
1911                 // Update recentchanges
1912                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1913                         // Mark as patrolled if the user can do so
1914                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) &&
1915                                 !count( $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1916                         // Add RC row to the DB
1917                         RecentChange::notifyNew(
1918                                 $now,
1919                                 $this->mTitle,
1920                                 $revision->isMinor(),
1921                                 $user,
1922                                 $summary,
1923                                 $meta['bot'],
1924                                 '',
1925                                 $newsize,
1926                                 $revisionId,
1927                                 $patrolled,
1928                                 $meta['tags']
1929                         );
1930                 }
1931
1932                 $user->incEditCount();
1933
1934                 $dbw->endAtomic( __METHOD__ );
1935                 $this->mTimestamp = $now;
1936
1937                 // Return the new revision to the caller
1938                 $status->value['revision'] = $revision;
1939
1940                 // Do secondary updates once the main changes have been committed...
1941                 DeferredUpdates::addUpdate(
1942                         new AtomicSectionUpdate(
1943                                 $dbw,
1944                                 __METHOD__,
1945                                 function () use (
1946                                         $revision, &$user, $content, $summary, &$flags, $meta, &$status
1947                                 ) {
1948                                         // Update links, etc.
1949                                         $this->doEditUpdates( $revision, $user, [ 'created' => true ] );
1950                                         // Avoid PHP 7.1 warning of passing $this by reference
1951                                         $wikiPage = $this;
1952                                         // Trigger post-create hook
1953                                         $params = [ &$wikiPage, &$user, $content, $summary,
1954                                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ];
1955                                         Hooks::run( 'PageContentInsertComplete', $params );
1956                                         // Trigger post-save hook
1957                                         $params = array_merge( $params, [ &$status, $meta['baseRevId'], 0 ] );
1958                                         Hooks::run( 'PageContentSaveComplete', $params );
1959                                 }
1960                         ),
1961                         DeferredUpdates::PRESEND
1962                 );
1963
1964                 return $status;
1965         }
1966
1967         /**
1968          * Get parser options suitable for rendering the primary article wikitext
1969          *
1970          * @see ContentHandler::makeParserOptions
1971          *
1972          * @param IContextSource|User|string $context One of the following:
1973          *        - IContextSource: Use the User and the Language of the provided
1974          *          context
1975          *        - User: Use the provided User object and $wgLang for the language,
1976          *          so use an IContextSource object if possible.
1977          *        - 'canonical': Canonical options (anonymous user with default
1978          *          preferences and content language).
1979          * @return ParserOptions
1980          */
1981         public function makeParserOptions( $context ) {
1982                 $options = $this->getContentHandler()->makeParserOptions( $context );
1983
1984                 if ( $this->getTitle()->isConversionTable() ) {
1985                         // @todo ConversionTable should become a separate content model, so
1986                         // we don't need special cases like this one.
1987                         $options->disableContentConversion();
1988                 }
1989
1990                 return $options;
1991         }
1992
1993         /**
1994          * Prepare content which is about to be saved.
1995          *
1996          * Prior to 1.30, this returned a stdClass object with the same class
1997          * members.
1998          *
1999          * @param Content $content
2000          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
2001          *        revision ID is also accepted, but this is deprecated.
2002          * @param User|null $user
2003          * @param string|null $serialFormat
2004          * @param bool $useCache Check shared prepared edit cache
2005          *
2006          * @return PreparedEdit
2007          *
2008          * @since 1.21
2009          */
2010         public function prepareContentForEdit(
2011                 Content $content, $revision = null, User $user = null,
2012                 $serialFormat = null, $useCache = true
2013         ) {
2014                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2015
2016                 if ( is_object( $revision ) ) {
2017                         $revid = $revision->getId();
2018                 } else {
2019                         $revid = $revision;
2020                         // This code path is deprecated, and nothing is known to
2021                         // use it, so performance here shouldn't be a worry.
2022                         if ( $revid !== null ) {
2023                                 wfDeprecated( __METHOD__ . ' with $revision = revision ID', '1.25' );
2024                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2025                         } else {
2026                                 $revision = null;
2027                         }
2028                 }
2029
2030                 $user = is_null( $user ) ? $wgUser : $user;
2031                 // XXX: check $user->getId() here???
2032
2033                 // Use a sane default for $serialFormat, see T59026
2034                 if ( $serialFormat === null ) {
2035                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2036                 }
2037
2038                 if ( $this->mPreparedEdit
2039                         && isset( $this->mPreparedEdit->newContent )
2040                         && $this->mPreparedEdit->newContent->equals( $content )
2041                         && $this->mPreparedEdit->revid == $revid
2042                         && $this->mPreparedEdit->format == $serialFormat
2043                         // XXX: also check $user here?
2044                 ) {
2045                         // Already prepared
2046                         return $this->mPreparedEdit;
2047                 }
2048
2049                 // The edit may have already been prepared via api.php?action=stashedit
2050                 $cachedEdit = $useCache && $wgAjaxEditStash
2051                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2052                         : false;
2053
2054                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2055                 Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );
2056
2057                 $edit = new PreparedEdit();
2058                 if ( $cachedEdit ) {
2059                         $edit->timestamp = $cachedEdit->timestamp;
2060                 } else {
2061                         $edit->timestamp = wfTimestampNow();
2062                 }
2063                 // @note: $cachedEdit is safely not used if the rev ID was referenced in the text
2064                 $edit->revid = $revid;
2065
2066                 if ( $cachedEdit ) {
2067                         $edit->pstContent = $cachedEdit->pstContent;
2068                 } else {
2069                         $edit->pstContent = $content
2070                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2071                                 : null;
2072                 }
2073
2074                 $edit->format = $serialFormat;
2075                 $edit->popts = $this->makeParserOptions( 'canonical' );
2076                 if ( $cachedEdit ) {
2077                         $edit->output = $cachedEdit->output;
2078                 } else {
2079                         if ( $revision ) {
2080                                 // We get here if vary-revision is set. This means that this page references
2081                                 // itself (such as via self-transclusion). In this case, we need to make sure
2082                                 // that any such self-references refer to the newly-saved revision, and not
2083                                 // to the previous one, which could otherwise happen due to replica DB lag.
2084                                 $oldCallback = $edit->popts->getCurrentRevisionCallback();
2085                                 $edit->popts->setCurrentRevisionCallback(
2086                                         function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
2087                                                 if ( $title->equals( $revision->getTitle() ) ) {
2088                                                         return $revision;
2089                                                 } else {
2090                                                         return call_user_func( $oldCallback, $title, $parser );
2091                                                 }
2092                                         }
2093                                 );
2094                         } else {
2095                                 // Try to avoid a second parse if {{REVISIONID}} is used
2096                                 $dbIndex = ( $this->mDataLoadedFrom & self::READ_LATEST ) === self::READ_LATEST
2097                                         ? DB_MASTER // use the best possible guess
2098                                         : DB_REPLICA; // T154554
2099
2100                                 $edit->popts->setSpeculativeRevIdCallback( function () use ( $dbIndex ) {
2101                                         return 1 + (int)wfGetDB( $dbIndex )->selectField(
2102                                                 'revision',
2103                                                 'MAX(rev_id)',
2104                                                 [],
2105                                                 __METHOD__
2106                                         );
2107                                 } );
2108                         }
2109                         $edit->output = $edit->pstContent
2110                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2111                                 : null;
2112                 }
2113
2114                 $edit->newContent = $content;
2115                 $edit->oldContent = $this->getContent( Revision::RAW );
2116
2117                 // NOTE: B/C for hooks! don't use these fields!
2118                 $edit->newText = $edit->newContent
2119                         ? ContentHandler::getContentText( $edit->newContent )
2120                         : '';
2121                 $edit->oldText = $edit->oldContent
2122                         ? ContentHandler::getContentText( $edit->oldContent )
2123                         : '';
2124                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2125
2126                 if ( $edit->output ) {
2127                         $edit->output->setCacheTime( wfTimestampNow() );
2128                 }
2129
2130                 // Process cache the result
2131                 $this->mPreparedEdit = $edit;
2132
2133                 return $edit;
2134         }
2135
2136         /**
2137          * Do standard deferred updates after page edit.
2138          * Update links tables, site stats, search index and message cache.
2139          * Purges pages that include this page if the text was changed here.
2140          * Every 100th edit, prune the recent changes table.
2141          *
2142          * @param Revision $revision
2143          * @param User $user User object that did the revision
2144          * @param array $options Array of options, following indexes are used:
2145          * - changed: bool, whether the revision changed the content (default true)
2146          * - created: bool, whether the revision created the page (default false)
2147          * - moved: bool, whether the page was moved (default false)
2148          * - restored: bool, whether the page was undeleted (default false)
2149          * - oldrevision: Revision object for the pre-update revision (default null)
2150          * - oldcountable: bool, null, or string 'no-change' (default null):
2151          *   - bool: whether the page was counted as an article before that
2152          *     revision, only used in changed is true and created is false
2153          *   - null: if created is false, don't update the article count; if created
2154          *     is true, do update the article count
2155          *   - 'no-change': don't update the article count, ever
2156          */
2157         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2158                 global $wgRCWatchCategoryMembership;
2159
2160                 $options += [
2161                         'changed' => true,
2162                         'created' => false,
2163                         'moved' => false,
2164                         'restored' => false,
2165                         'oldrevision' => null,
2166                         'oldcountable' => null
2167                 ];
2168                 $content = $revision->getContent();
2169
2170                 $logger = LoggerFactory::getInstance( 'SaveParse' );
2171
2172                 // See if the parser output before $revision was inserted is still valid
2173                 $editInfo = false;
2174                 if ( !$this->mPreparedEdit ) {
2175                         $logger->debug( __METHOD__ . ": No prepared edit...\n" );
2176                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2177                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision...\n" );
2178                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision-id' )
2179                         && $this->mPreparedEdit->output->getSpeculativeRevIdUsed() !== $revision->getId()
2180                 ) {
2181                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision-id with wrong ID...\n" );
2182                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-user' ) && !$options['changed'] ) {
2183                         $logger->info( __METHOD__ . ": Prepared edit has vary-user and is null...\n" );
2184                 } else {
2185                         wfDebug( __METHOD__ . ": Using prepared edit...\n" );
2186                         $editInfo = $this->mPreparedEdit;
2187                 }
2188
2189                 if ( !$editInfo ) {
2190                         // Parse the text again if needed. Be careful not to do pre-save transform twice:
2191                         // $text is usually already pre-save transformed once. Avoid using the edit stash
2192                         // as any prepared content from there or in doEditContent() was already rejected.
2193                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user, null, false );
2194                 }
2195
2196                 // Save it to the parser cache.
2197                 // Make sure the cache time matches page_touched to avoid double parsing.
2198                 MediaWikiServices::getInstance()->getParserCache()->save(
2199                         $editInfo->output, $this, $editInfo->popts,
2200                         $revision->getTimestamp(), $editInfo->revid
2201                 );
2202
2203                 // Update the links tables and other secondary data
2204                 if ( $content ) {
2205                         $recursive = $options['changed']; // T52785
2206                         $updates = $content->getSecondaryDataUpdates(
2207                                 $this->getTitle(), null, $recursive, $editInfo->output
2208                         );
2209                         foreach ( $updates as $update ) {
2210                                 $update->setCause( 'edit-page', $user->getName() );
2211                                 if ( $update instanceof LinksUpdate ) {
2212                                         $update->setRevision( $revision );
2213                                         $update->setTriggeringUser( $user );
2214                                 }
2215                                 DeferredUpdates::addUpdate( $update );
2216                         }
2217                         if ( $wgRCWatchCategoryMembership
2218                                 && $this->getContentHandler()->supportsCategories() === true
2219                                 && ( $options['changed'] || $options['created'] )
2220                                 && !$options['restored']
2221                         ) {
2222                                 // Note: jobs are pushed after deferred updates, so the job should be able to see
2223                                 // the recent change entry (also done via deferred updates) and carry over any
2224                                 // bot/deletion/IP flags, ect.
2225                                 JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
2226                                         $this->getTitle(),
2227                                         [
2228                                                 'pageId' => $this->getId(),
2229                                                 'revTimestamp' => $revision->getTimestamp()
2230                                         ]
2231                                 ) );
2232                         }
2233                 }
2234
2235                 // Avoid PHP 7.1 warning of passing $this by reference
2236                 $wikiPage = $this;
2237
2238                 Hooks::run( 'ArticleEditUpdates', [ &$wikiPage, &$editInfo, $options['changed'] ] );
2239
2240                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$wikiPage ] ) ) {
2241                         // Flush old entries from the `recentchanges` table
2242                         if ( mt_rand( 0, 9 ) == 0 ) {
2243                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2244                         }
2245                 }
2246
2247                 if ( !$this->exists() ) {
2248                         return;
2249                 }
2250
2251                 $id = $this->getId();
2252                 $title = $this->mTitle->getPrefixedDBkey();
2253                 $shortTitle = $this->mTitle->getDBkey();
2254
2255                 if ( $options['oldcountable'] === 'no-change' ||
2256                         ( !$options['changed'] && !$options['moved'] )
2257                 ) {
2258                         $good = 0;
2259                 } elseif ( $options['created'] ) {
2260                         $good = (int)$this->isCountable( $editInfo );
2261                 } elseif ( $options['oldcountable'] !== null ) {
2262                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2263                 } else {
2264                         $good = 0;
2265                 }
2266                 $edits = $options['changed'] ? 1 : 0;
2267                 $total = $options['created'] ? 1 : 0;
2268
2269                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2270                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2271
2272                 // If this is another user's talk page, update newtalk.
2273                 // Don't do this if $options['changed'] = false (null-edits) nor if
2274                 // it's a minor edit and the user doesn't want notifications for those.
2275                 if ( $options['changed']
2276                         && $this->mTitle->getNamespace() == NS_USER_TALK
2277                         && $shortTitle != $user->getTitleKey()
2278                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2279                 ) {
2280                         $recipient = User::newFromName( $shortTitle, false );
2281                         if ( !$recipient ) {
2282                                 wfDebug( __METHOD__ . ": invalid username\n" );
2283                         } else {
2284                                 // Avoid PHP 7.1 warning of passing $this by reference
2285                                 $wikiPage = $this;
2286
2287                                 // Allow extensions to prevent user notification
2288                                 // when a new message is added to their talk page
2289                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$wikiPage, $recipient ] ) ) {
2290                                         if ( User::isIP( $shortTitle ) ) {
2291                                                 // An anonymous user
2292                                                 $recipient->setNewtalk( true, $revision );
2293                                         } elseif ( $recipient->isLoggedIn() ) {
2294                                                 $recipient->setNewtalk( true, $revision );
2295                                         } else {
2296                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2297                                         }
2298                                 }
2299                         }
2300                 }
2301
2302                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2303                         MessageCache::singleton()->updateMessageOverride( $this->mTitle, $content );
2304                 }
2305
2306                 if ( $options['created'] ) {
2307                         self::onArticleCreate( $this->mTitle );
2308                 } elseif ( $options['changed'] ) { // T52785
2309                         self::onArticleEdit( $this->mTitle, $revision );
2310                 }
2311
2312                 ResourceLoaderWikiModule::invalidateModuleCache(
2313                         $this->mTitle, $options['oldrevision'], $revision, wfWikiID()
2314                 );
2315         }
2316
2317         /**
2318          * Update the article's restriction field, and leave a log entry.
2319          * This works for protection both existing and non-existing pages.
2320          *
2321          * @param array $limit Set of restriction keys
2322          * @param array $expiry Per restriction type expiration
2323          * @param int &$cascade Set to false if cascading protection isn't allowed.
2324          * @param string $reason
2325          * @param User $user The user updating the restrictions
2326          * @param string|string[] $tags Change tags to add to the pages and protection log entries
2327          *   ($user should be able to add the specified tags before this is called)
2328          * @return Status Status object; if action is taken, $status->value is the log_id of the
2329          *   protection log entry.
2330          */
2331         public function doUpdateRestrictions( array $limit, array $expiry,
2332                 &$cascade, $reason, User $user, $tags = null
2333         ) {
2334                 global $wgCascadingRestrictionLevels;
2335
2336                 if ( wfReadOnly() ) {
2337                         return Status::newFatal( wfMessage( 'readonlytext', wfReadOnlyReason() ) );
2338                 }
2339
2340                 $this->loadPageData( 'fromdbmaster' );
2341                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2342                 $id = $this->getId();
2343
2344                 if ( !$cascade ) {
2345                         $cascade = false;
2346                 }
2347
2348                 // Take this opportunity to purge out expired restrictions
2349                 Title::purgeExpiredRestrictions();
2350
2351                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2352                 // we expect a single selection, but the schema allows otherwise.
2353                 $isProtected = false;
2354                 $protect = false;
2355                 $changed = false;
2356
2357                 $dbw = wfGetDB( DB_MASTER );
2358
2359                 foreach ( $restrictionTypes as $action ) {
2360                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2361                                 $expiry[$action] = 'infinity';
2362                         }
2363                         if ( !isset( $limit[$action] ) ) {
2364                                 $limit[$action] = '';
2365                         } elseif ( $limit[$action] != '' ) {
2366                                 $protect = true;
2367                         }
2368
2369                         // Get current restrictions on $action
2370                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2371                         if ( $current != '' ) {
2372                                 $isProtected = true;
2373                         }
2374
2375                         if ( $limit[$action] != $current ) {
2376                                 $changed = true;
2377                         } elseif ( $limit[$action] != '' ) {
2378                                 // Only check expiry change if the action is actually being
2379                                 // protected, since expiry does nothing on an not-protected
2380                                 // action.
2381                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2382                                         $changed = true;
2383                                 }
2384                         }
2385                 }
2386
2387                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2388                         $changed = true;
2389                 }
2390
2391                 // If nothing has changed, do nothing
2392                 if ( !$changed ) {
2393                         return Status::newGood();
2394                 }
2395
2396                 if ( !$protect ) { // No protection at all means unprotection
2397                         $revCommentMsg = 'unprotectedarticle-comment';
2398                         $logAction = 'unprotect';
2399                 } elseif ( $isProtected ) {
2400                         $revCommentMsg = 'modifiedarticleprotection-comment';
2401                         $logAction = 'modify';
2402                 } else {
2403                         $revCommentMsg = 'protectedarticle-comment';
2404                         $logAction = 'protect';
2405                 }
2406
2407                 $logRelationsValues = [];
2408                 $logRelationsField = null;
2409                 $logParamsDetails = [];
2410
2411                 // Null revision (used for change tag insertion)
2412                 $nullRevision = null;
2413
2414                 if ( $id ) { // Protection of existing page
2415                         // Avoid PHP 7.1 warning of passing $this by reference
2416                         $wikiPage = $this;
2417
2418                         if ( !Hooks::run( 'ArticleProtect', [ &$wikiPage, &$user, $limit, $reason ] ) ) {
2419                                 return Status::newGood();
2420                         }
2421
2422                         // Only certain restrictions can cascade...
2423                         $editrestriction = isset( $limit['edit'] )
2424                                 ? [ $limit['edit'] ]
2425                                 : $this->mTitle->getRestrictions( 'edit' );
2426                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2427                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2428                         }
2429                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2430                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2431                         }
2432
2433                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2434                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2435                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2436                         }
2437                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2438                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2439                         }
2440
2441                         // The schema allows multiple restrictions
2442                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2443                                 $cascade = false;
2444                         }
2445
2446                         // insert null revision to identify the page protection change as edit summary
2447                         $latest = $this->getLatest();
2448                         $nullRevision = $this->insertProtectNullRevision(
2449                                 $revCommentMsg,
2450                                 $limit,
2451                                 $expiry,
2452                                 $cascade,
2453                                 $reason,
2454                                 $user
2455                         );
2456
2457                         if ( $nullRevision === null ) {
2458                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2459                         }
2460
2461                         $logRelationsField = 'pr_id';
2462
2463                         // Update restrictions table
2464                         foreach ( $limit as $action => $restrictions ) {
2465                                 $dbw->delete(
2466                                         'page_restrictions',
2467                                         [
2468                                                 'pr_page' => $id,
2469                                                 'pr_type' => $action
2470                                         ],
2471                                         __METHOD__
2472                                 );
2473                                 if ( $restrictions != '' ) {
2474                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2475                                         $dbw->insert(
2476                                                 'page_restrictions',
2477                                                 [
2478                                                         'pr_page' => $id,
2479                                                         'pr_type' => $action,
2480                                                         'pr_level' => $restrictions,
2481                                                         'pr_cascade' => $cascadeValue,
2482                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2483                                                 ],
2484                                                 __METHOD__
2485                                         );
2486                                         $logRelationsValues[] = $dbw->insertId();
2487                                         $logParamsDetails[] = [
2488                                                 'type' => $action,
2489                                                 'level' => $restrictions,
2490                                                 'expiry' => $expiry[$action],
2491                                                 'cascade' => (bool)$cascadeValue,
2492                                         ];
2493                                 }
2494                         }
2495
2496                         // Clear out legacy restriction fields
2497                         $dbw->update(
2498                                 'page',
2499                                 [ 'page_restrictions' => '' ],
2500                                 [ 'page_id' => $id ],
2501                                 __METHOD__
2502                         );
2503
2504                         // Avoid PHP 7.1 warning of passing $this by reference
2505                         $wikiPage = $this;
2506
2507                         Hooks::run( 'NewRevisionFromEditComplete',
2508                                 [ $this, $nullRevision, $latest, $user ] );
2509                         Hooks::run( 'ArticleProtectComplete', [ &$wikiPage, &$user, $limit, $reason ] );
2510                 } else { // Protection of non-existing page (also known as "title protection")
2511                         // Cascade protection is meaningless in this case
2512                         $cascade = false;
2513
2514                         if ( $limit['create'] != '' ) {
2515                                 $commentFields = CommentStore::newKey( 'pt_reason' )->insert( $dbw, $reason );
2516                                 $dbw->replace( 'protected_titles',
2517                                         [ [ 'pt_namespace', 'pt_title' ] ],
2518                                         [
2519                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2520                                                 'pt_title' => $this->mTitle->getDBkey(),
2521                                                 'pt_create_perm' => $limit['create'],
2522                                                 'pt_timestamp' => $dbw->timestamp(),
2523                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2524                                                 'pt_user' => $user->getId(),
2525                                         ] + $commentFields, __METHOD__
2526                                 );
2527                                 $logParamsDetails[] = [
2528                                         'type' => 'create',
2529                                         'level' => $limit['create'],
2530                                         'expiry' => $expiry['create'],
2531                                 ];
2532                         } else {
2533                                 $dbw->delete( 'protected_titles',
2534                                         [
2535                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2536                                                 'pt_title' => $this->mTitle->getDBkey()
2537                                         ], __METHOD__
2538                                 );
2539                         }
2540                 }
2541
2542                 $this->mTitle->flushRestrictions();
2543                 InfoAction::invalidateCache( $this->mTitle );
2544
2545                 if ( $logAction == 'unprotect' ) {
2546                         $params = [];
2547                 } else {
2548                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2549                         $params = [
2550                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2551                                 '5:bool:cascade' => $cascade,
2552                                 'details' => $logParamsDetails, // parameter for localize and api
2553                         ];
2554                 }
2555
2556                 // Update the protection log
2557                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2558                 $logEntry->setTarget( $this->mTitle );
2559                 $logEntry->setComment( $reason );
2560                 $logEntry->setPerformer( $user );
2561                 $logEntry->setParameters( $params );
2562                 if ( !is_null( $nullRevision ) ) {
2563                         $logEntry->setAssociatedRevId( $nullRevision->getId() );
2564                 }
2565                 $logEntry->setTags( $tags );
2566                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2567                         $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
2568                 }
2569                 $logId = $logEntry->insert();
2570                 $logEntry->publish( $logId );
2571
2572                 return Status::newGood( $logId );
2573         }
2574
2575         /**
2576          * Insert a new null revision for this page.
2577          *
2578          * @param string $revCommentMsg Comment message key for the revision
2579          * @param array $limit Set of restriction keys
2580          * @param array $expiry Per restriction type expiration
2581          * @param int $cascade Set to false if cascading protection isn't allowed.
2582          * @param string $reason
2583          * @param User|null $user
2584          * @return Revision|null Null on error
2585          */
2586         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2587                 array $expiry, $cascade, $reason, $user = null
2588         ) {
2589                 $dbw = wfGetDB( DB_MASTER );
2590
2591                 // Prepare a null revision to be added to the history
2592                 $editComment = wfMessage(
2593                         $revCommentMsg,
2594                         $this->mTitle->getPrefixedText(),
2595                         $user ? $user->getName() : ''
2596                 )->inContentLanguage()->text();
2597                 if ( $reason ) {
2598                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2599                 }
2600                 $protectDescription = $this->protectDescription( $limit, $expiry );
2601                 if ( $protectDescription ) {
2602                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2603                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2604                                 ->inContentLanguage()->text();
2605                 }
2606                 if ( $cascade ) {
2607                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2608                         $editComment .= wfMessage( 'brackets' )->params(
2609                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2610                         )->inContentLanguage()->text();
2611                 }
2612
2613                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2614                 if ( $nullRev ) {
2615                         $nullRev->insertOn( $dbw );
2616
2617                         // Update page record and touch page
2618                         $oldLatest = $nullRev->getParentId();
2619                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2620                 }
2621
2622                 return $nullRev;
2623         }
2624
2625         /**
2626          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2627          * @return string
2628          */
2629         protected function formatExpiry( $expiry ) {
2630                 global $wgContLang;
2631
2632                 if ( $expiry != 'infinity' ) {
2633                         return wfMessage(
2634                                 'protect-expiring',
2635                                 $wgContLang->timeanddate( $expiry, false, false ),
2636                                 $wgContLang->date( $expiry, false, false ),
2637                                 $wgContLang->time( $expiry, false, false )
2638                         )->inContentLanguage()->text();
2639                 } else {
2640                         return wfMessage( 'protect-expiry-indefinite' )
2641                                 ->inContentLanguage()->text();
2642                 }
2643         }
2644
2645         /**
2646          * Builds the description to serve as comment for the edit.
2647          *
2648          * @param array $limit Set of restriction keys
2649          * @param array $expiry Per restriction type expiration
2650          * @return string
2651          */
2652         public function protectDescription( array $limit, array $expiry ) {
2653                 $protectDescription = '';
2654
2655                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2656                         # $action is one of $wgRestrictionTypes = [ 'create', 'edit', 'move', 'upload' ].
2657                         # All possible message keys are listed here for easier grepping:
2658                         # * restriction-create
2659                         # * restriction-edit
2660                         # * restriction-move
2661                         # * restriction-upload
2662                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2663                         # $restrictions is one of $wgRestrictionLevels = [ '', 'autoconfirmed', 'sysop' ],
2664                         # with '' filtered out. All possible message keys are listed below:
2665                         # * protect-level-autoconfirmed
2666                         # * protect-level-sysop
2667                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
2668                                 ->inContentLanguage()->text();
2669
2670                         $expiryText = $this->formatExpiry( $expiry[$action] );
2671
2672                         if ( $protectDescription !== '' ) {
2673                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2674                         }
2675                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2676                                 ->params( $actionText, $restrictionsText, $expiryText )
2677                                 ->inContentLanguage()->text();
2678                 }
2679
2680                 return $protectDescription;
2681         }
2682
2683         /**
2684          * Builds the description to serve as comment for the log entry.
2685          *
2686          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2687          * protect description text. Keep them in old format to avoid breaking compatibility.
2688          * TODO: Fix protection log to store structured description and format it on-the-fly.
2689          *
2690          * @param array $limit Set of restriction keys
2691          * @param array $expiry Per restriction type expiration
2692          * @return string
2693          */
2694         public function protectDescriptionLog( array $limit, array $expiry ) {
2695                 global $wgContLang;
2696
2697                 $protectDescriptionLog = '';
2698
2699                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2700                         $expiryText = $this->formatExpiry( $expiry[$action] );
2701                         $protectDescriptionLog .= $wgContLang->getDirMark() .
2702                                 "[$action=$restrictions] ($expiryText)";
2703                 }
2704
2705                 return trim( $protectDescriptionLog );
2706         }
2707
2708         /**
2709          * Take an array of page restrictions and flatten it to a string
2710          * suitable for insertion into the page_restrictions field.
2711          *
2712          * @param string[] $limit
2713          *
2714          * @throws MWException
2715          * @return string
2716          */
2717         protected static function flattenRestrictions( $limit ) {
2718                 if ( !is_array( $limit ) ) {
2719                         throw new MWException( __METHOD__ . ' given non-array restriction set' );
2720                 }
2721
2722                 $bits = [];
2723                 ksort( $limit );
2724
2725                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2726                         $bits[] = "$action=$restrictions";
2727                 }
2728
2729                 return implode( ':', $bits );
2730         }
2731
2732         /**
2733          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2734          * backwards compatibility, if you care about error reporting you should use
2735          * doDeleteArticleReal() instead.
2736          *
2737          * Deletes the article with database consistency, writes logs, purges caches
2738          *
2739          * @param string $reason Delete reason for deletion log
2740          * @param bool $suppress Suppress all revisions and log the deletion in
2741          *        the suppression log instead of the deletion log
2742          * @param int $u1 Unused
2743          * @param bool $u2 Unused
2744          * @param array|string &$error Array of errors to append to
2745          * @param User $user The deleting user
2746          * @return bool True if successful
2747          */
2748         public function doDeleteArticle(
2749                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2750         ) {
2751                 $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
2752                 return $status->isGood();
2753         }
2754
2755         /**
2756          * Back-end article deletion
2757          * Deletes the article with database consistency, writes logs, purges caches
2758          *
2759          * @since 1.19
2760          *
2761          * @param string $reason Delete reason for deletion log
2762          * @param bool $suppress Suppress all revisions and log the deletion in
2763          *   the suppression log instead of the deletion log
2764          * @param int $u1 Unused
2765          * @param bool $u2 Unused
2766          * @param array|string &$error Array of errors to append to
2767          * @param User $user The deleting user
2768          * @param array $tags Tags to apply to the deletion action
2769          * @param string $logsubtype
2770          * @return Status Status object; if successful, $status->value is the log_id of the
2771          *   deletion log entry. If the page couldn't be deleted because it wasn't
2772          *   found, $status is a non-fatal 'cannotdelete' error
2773          */
2774         public function doDeleteArticleReal(
2775                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2776                 $tags = [], $logsubtype = 'delete'
2777         ) {
2778                 global $wgUser, $wgContentHandlerUseDB, $wgCommentTableSchemaMigrationStage;
2779
2780                 wfDebug( __METHOD__ . "\n" );
2781
2782                 $status = Status::newGood();
2783
2784                 if ( $this->mTitle->getDBkey() === '' ) {
2785                         $status->error( 'cannotdelete',
2786                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2787                         return $status;
2788                 }
2789
2790                 // Avoid PHP 7.1 warning of passing $this by reference
2791                 $wikiPage = $this;
2792
2793                 $user = is_null( $user ) ? $wgUser : $user;
2794                 if ( !Hooks::run( 'ArticleDelete',
2795                         [ &$wikiPage, &$user, &$reason, &$error, &$status, $suppress ]
2796                 ) ) {
2797                         if ( $status->isOK() ) {
2798                                 // Hook aborted but didn't set a fatal status
2799                                 $status->fatal( 'delete-hook-aborted' );
2800                         }
2801                         return $status;
2802                 }
2803
2804                 $dbw = wfGetDB( DB_MASTER );
2805                 $dbw->startAtomic( __METHOD__ );
2806
2807                 $this->loadPageData( self::READ_LATEST );
2808                 $id = $this->getId();
2809                 // T98706: lock the page from various other updates but avoid using
2810                 // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2811                 // the revisions queries (which also JOIN on user). Only lock the page
2812                 // row and CAS check on page_latest to see if the trx snapshot matches.
2813                 $lockedLatest = $this->lockAndGetLatest();
2814                 if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
2815                         $dbw->endAtomic( __METHOD__ );
2816                         // Page not there or trx snapshot is stale
2817                         $status->error( 'cannotdelete',
2818                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2819                         return $status;
2820                 }
2821
2822                 // Given the lock above, we can be confident in the title and page ID values
2823                 $namespace = $this->getTitle()->getNamespace();
2824                 $dbKey = $this->getTitle()->getDBkey();
2825
2826                 // At this point we are now comitted to returning an OK
2827                 // status unless some DB query error or other exception comes up.
2828                 // This way callers don't have to call rollback() if $status is bad
2829                 // unless they actually try to catch exceptions (which is rare).
2830
2831                 // we need to remember the old content so we can use it to generate all deletion updates.
2832                 $revision = $this->getRevision();
2833                 try {
2834                         $content = $this->getContent( Revision::RAW );
2835                 } catch ( Exception $ex ) {
2836                         wfLogWarning( __METHOD__ . ': failed to load content during deletion! '
2837                                 . $ex->getMessage() );
2838
2839                         $content = null;
2840                 }
2841
2842                 $revCommentStore = new CommentStore( 'rev_comment' );
2843                 $arCommentStore = new CommentStore( 'ar_comment' );
2844
2845                 $revQuery = Revision::getQueryInfo();
2846                 $bitfield = false;
2847
2848                 // Bitfields to further suppress the content
2849                 if ( $suppress ) {
2850                         $bitfield = Revision::SUPPRESSED_ALL;
2851                         $revQuery['fields'] = array_diff( $revQuery['fields'], [ 'rev_deleted' ] );
2852                 }
2853
2854                 // For now, shunt the revision data into the archive table.
2855                 // Text is *not* removed from the text table; bulk storage
2856                 // is left intact to avoid breaking block-compression or
2857                 // immutable storage schemes.
2858                 // In the future, we may keep revisions and mark them with
2859                 // the rev_deleted field, which is reserved for this purpose.
2860
2861                 // Get all of the page revisions
2862                 $res = $dbw->select(
2863                         $revQuery['tables'],
2864                         $revQuery['fields'],
2865                         [ 'rev_page' => $id ],
2866                         __METHOD__,
2867                         'FOR UPDATE',
2868                         $revQuery['joins']
2869                 );
2870
2871                 // Build their equivalent archive rows
2872                 $rowsInsert = [];
2873                 $revids = [];
2874
2875                 /** @var int[] Revision IDs of edits that were made by IPs */
2876                 $ipRevIds = [];
2877
2878                 foreach ( $res as $row ) {
2879                         $comment = $revCommentStore->getComment( $row );
2880                         $rowInsert = [
2881                                 'ar_namespace'  => $namespace,
2882                                 'ar_title'      => $dbKey,
2883                                 'ar_user'       => $row->rev_user,
2884                                 'ar_user_text'  => $row->rev_user_text,
2885                                 'ar_timestamp'  => $row->rev_timestamp,
2886                                 'ar_minor_edit' => $row->rev_minor_edit,
2887                                 'ar_rev_id'     => $row->rev_id,
2888                                 'ar_parent_id'  => $row->rev_parent_id,
2889                                 'ar_text_id'    => $row->rev_text_id,
2890                                 'ar_text'       => '',
2891                                 'ar_flags'      => '',
2892                                 'ar_len'        => $row->rev_len,
2893                                 'ar_page_id'    => $id,
2894                                 'ar_deleted'    => $suppress ? $bitfield : $row->rev_deleted,
2895                                 'ar_sha1'       => $row->rev_sha1,
2896                         ] + $arCommentStore->insert( $dbw, $comment );
2897                         if ( $wgContentHandlerUseDB ) {
2898                                 $rowInsert['ar_content_model'] = $row->rev_content_model;
2899                                 $rowInsert['ar_content_format'] = $row->rev_content_format;
2900                         }
2901                         $rowsInsert[] = $rowInsert;
2902                         $revids[] = $row->rev_id;
2903
2904                         // Keep track of IP edits, so that the corresponding rows can
2905                         // be deleted in the ip_changes table.
2906                         if ( (int)$row->rev_user === 0 && IP::isValid( $row->rev_user_text ) ) {
2907                                 $ipRevIds[] = $row->rev_id;
2908                         }
2909                 }
2910                 // Copy them into the archive table
2911                 $dbw->insert( 'archive', $rowsInsert, __METHOD__ );
2912                 // Save this so we can pass it to the ArticleDeleteComplete hook.
2913                 $archivedRevisionCount = $dbw->affectedRows();
2914
2915                 // Clone the title and wikiPage, so we have the information we need when
2916                 // we log and run the ArticleDeleteComplete hook.
2917                 $logTitle = clone $this->mTitle;
2918                 $wikiPageBeforeDelete = clone $this;
2919
2920                 // Now that it's safely backed up, delete it
2921                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
2922                 $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
2923                 if ( $wgCommentTableSchemaMigrationStage > MIGRATION_OLD ) {
2924                         $dbw->delete( 'revision_comment_temp', [ 'revcomment_rev' => $revids ], __METHOD__ );
2925                 }
2926
2927                 // Also delete records from ip_changes as applicable.
2928                 if ( count( $ipRevIds ) > 0 ) {
2929                         $dbw->delete( 'ip_changes', [ 'ipc_rev_id' => $ipRevIds ], __METHOD__ );
2930                 }
2931
2932                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
2933                 $logtype = $suppress ? 'suppress' : 'delete';
2934
2935                 $logEntry = new ManualLogEntry( $logtype, $logsubtype );
2936                 $logEntry->setPerformer( $user );
2937                 $logEntry->setTarget( $logTitle );
2938                 $logEntry->setComment( $reason );
2939                 $logEntry->setTags( $tags );
2940                 $logid = $logEntry->insert();
2941
2942                 $dbw->onTransactionPreCommitOrIdle(
2943                         function () use ( $dbw, $logEntry, $logid ) {
2944                                 // T58776: avoid deadlocks (especially from FileDeleteForm)
2945                                 $logEntry->publish( $logid );
2946                         },
2947                         __METHOD__
2948                 );
2949
2950                 $dbw->endAtomic( __METHOD__ );
2951
2952                 $this->doDeleteUpdates( $id, $content, $revision, $user );
2953
2954                 Hooks::run( 'ArticleDeleteComplete', [
2955                         &$wikiPageBeforeDelete,
2956                         &$user,
2957                         $reason,
2958                         $id,
2959                         $content,
2960                         $logEntry,
2961                         $archivedRevisionCount
2962                 ] );
2963                 $status->value = $logid;
2964
2965                 // Show log excerpt on 404 pages rather than just a link
2966                 $cache = MediaWikiServices::getInstance()->getMainObjectStash();
2967                 $key = $cache->makeKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
2968                 $cache->set( $key, 1, $cache::TTL_DAY );
2969
2970                 return $status;
2971         }
2972
2973         /**
2974          * Lock the page row for this title+id and return page_latest (or 0)
2975          *
2976          * @return int Returns 0 if no row was found with this title+id
2977          * @since 1.27
2978          */
2979         public function lockAndGetLatest() {
2980                 return (int)wfGetDB( DB_MASTER )->selectField(
2981                         'page',
2982                         'page_latest',
2983                         [
2984                                 'page_id' => $this->getId(),
2985                                 // Typically page_id is enough, but some code might try to do
2986                                 // updates assuming the title is the same, so verify that
2987                                 'page_namespace' => $this->getTitle()->getNamespace(),
2988                                 'page_title' => $this->getTitle()->getDBkey()
2989                         ],
2990                         __METHOD__,
2991                         [ 'FOR UPDATE' ]
2992                 );
2993         }
2994
2995         /**
2996          * Do some database updates after deletion
2997          *
2998          * @param int $id The page_id value of the page being deleted
2999          * @param Content|null $content Optional page content to be used when determining
3000          *   the required updates. This may be needed because $this->getContent()
3001          *   may already return null when the page proper was deleted.
3002          * @param Revision|null $revision The latest page revision
3003          * @param User|null $user The user that caused the deletion
3004          */
3005         public function doDeleteUpdates(
3006                 $id, Content $content = null, Revision $revision = null, User $user = null
3007         ) {
3008                 try {
3009                         $countable = $this->isCountable();
3010                 } catch ( Exception $ex ) {
3011                         // fallback for deleting broken pages for which we cannot load the content for
3012                         // some reason. Note that doDeleteArticleReal() already logged this problem.
3013                         $countable = false;
3014                 }
3015
3016                 // Update site status
3017                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$countable, -1 ) );
3018
3019                 // Delete pagelinks, update secondary indexes, etc
3020                 $updates = $this->getDeletionUpdates( $content );
3021                 foreach ( $updates as $update ) {
3022                         DeferredUpdates::addUpdate( $update );
3023                 }
3024
3025                 $causeAgent = $user ? $user->getName() : 'unknown';
3026                 // Reparse any pages transcluding this page
3027                 LinksUpdate::queueRecursiveJobsForTable(
3028                         $this->mTitle, 'templatelinks', 'delete-page', $causeAgent );
3029                 // Reparse any pages including this image
3030                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
3031                         LinksUpdate::queueRecursiveJobsForTable(
3032                                 $this->mTitle, 'imagelinks', 'delete-page', $causeAgent );
3033                 }
3034
3035                 // Clear caches
3036                 self::onArticleDelete( $this->mTitle );
3037                 ResourceLoaderWikiModule::invalidateModuleCache(
3038                         $this->mTitle, $revision, null, wfWikiID()
3039                 );
3040
3041                 // Reset this object and the Title object
3042                 $this->loadFromRow( false, self::READ_LATEST );
3043
3044                 // Search engine
3045                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
3046         }
3047
3048         /**
3049          * Roll back the most recent consecutive set of edits to a page
3050          * from the same user; fails if there are no eligible edits to
3051          * roll back to, e.g. user is the sole contributor. This function
3052          * performs permissions checks on $user, then calls commitRollback()
3053          * to do the dirty work
3054          *
3055          * @todo Separate the business/permission stuff out from backend code
3056          * @todo Remove $token parameter. Already verified by RollbackAction and ApiRollback.
3057          *
3058          * @param string $fromP Name of the user whose edits to rollback.
3059          * @param string $summary Custom summary. Set to default summary if empty.
3060          * @param string $token Rollback token.
3061          * @param bool $bot If true, mark all reverted edits as bot.
3062          *
3063          * @param array &$resultDetails Array contains result-specific array of additional values
3064          *    'alreadyrolled' : 'current' (rev)
3065          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3066          *
3067          * @param User $user The user performing the rollback
3068          * @param array|null $tags Change tags to apply to the rollback
3069          * Callers are responsible for permission checks
3070          * (with ChangeTags::canAddTagsAccompanyingChange)
3071          *
3072          * @return array Array of errors, each error formatted as
3073          *   array(messagekey, param1, param2, ...).
3074          * On success, the array is empty.  This array can also be passed to
3075          * OutputPage::showPermissionsErrorPage().
3076          */
3077         public function doRollback(
3078                 $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
3079         ) {
3080                 $resultDetails = null;
3081
3082                 // Check permissions
3083                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
3084                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
3085                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3086
3087                 if ( !$user->matchEditToken( $token, 'rollback' ) ) {
3088                         $errors[] = [ 'sessionfailure' ];
3089                 }
3090
3091                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
3092                         $errors[] = [ 'actionthrottledtext' ];
3093                 }
3094
3095                 // If there were errors, bail out now
3096                 if ( !empty( $errors ) ) {
3097                         return $errors;
3098                 }
3099
3100                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
3101         }
3102
3103         /**
3104          * Backend implementation of doRollback(), please refer there for parameter
3105          * and return value documentation
3106          *
3107          * NOTE: This function does NOT check ANY permissions, it just commits the
3108          * rollback to the DB. Therefore, you should only call this function direct-
3109          * ly if you want to use custom permissions checks. If you don't, use
3110          * doRollback() instead.
3111          * @param string $fromP Name of the user whose edits to rollback.
3112          * @param string $summary Custom summary. Set to default summary if empty.
3113          * @param bool $bot If true, mark all reverted edits as bot.
3114          *
3115          * @param array &$resultDetails Contains result-specific array of additional values
3116          * @param User $guser The user performing the rollback
3117          * @param array|null $tags Change tags to apply to the rollback
3118          * Callers are responsible for permission checks
3119          * (with ChangeTags::canAddTagsAccompanyingChange)
3120          *
3121          * @return array
3122          */
3123         public function commitRollback( $fromP, $summary, $bot,
3124                 &$resultDetails, User $guser, $tags = null
3125         ) {
3126                 global $wgUseRCPatrol, $wgContLang;
3127
3128                 $dbw = wfGetDB( DB_MASTER );
3129
3130                 if ( wfReadOnly() ) {
3131                         return [ [ 'readonlytext' ] ];
3132                 }
3133
3134                 // Get the last editor
3135                 $current = $this->getRevision();
3136                 if ( is_null( $current ) ) {
3137                         // Something wrong... no page?
3138                         return [ [ 'notanarticle' ] ];
3139                 }
3140
3141                 $from = str_replace( '_', ' ', $fromP );
3142                 // User name given should match up with the top revision.
3143                 // If the user was deleted then $from should be empty.
3144                 if ( $from != $current->getUserText() ) {
3145                         $resultDetails = [ 'current' => $current ];
3146                         return [ [ 'alreadyrolled',
3147                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3148                                 htmlspecialchars( $fromP ),
3149                                 htmlspecialchars( $current->getUserText() )
3150                         ] ];
3151                 }
3152
3153                 // Get the last edit not by this person...
3154                 // Note: these may not be public values
3155                 $user = intval( $current->getUser( Revision::RAW ) );
3156                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3157                 $s = $dbw->selectRow( 'revision',
3158                         [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
3159                         [ 'rev_page' => $current->getPage(),
3160                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3161                         ], __METHOD__,
3162                         [ 'USE INDEX' => 'page_timestamp',
3163                                 'ORDER BY' => 'rev_timestamp DESC' ]
3164                         );
3165                 if ( $s === false ) {
3166                         // No one else ever edited this page
3167                         return [ [ 'cantrollback' ] ];
3168                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3169                         || $s->rev_deleted & Revision::DELETED_USER
3170                 ) {
3171                         // Only admins can see this text
3172                         return [ [ 'notvisiblerev' ] ];
3173                 }
3174
3175                 // Generate the edit summary if necessary
3176                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3177                 if ( empty( $summary ) ) {
3178                         if ( $from == '' ) { // no public user name
3179                                 $summary = wfMessage( 'revertpage-nouser' );
3180                         } else {
3181                                 $summary = wfMessage( 'revertpage' );
3182                         }
3183                 }
3184
3185                 // Allow the custom summary to use the same args as the default message
3186                 $args = [
3187                         $target->getUserText(), $from, $s->rev_id,
3188                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3189                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3190                 ];
3191                 if ( $summary instanceof Message ) {
3192                         $summary = $summary->params( $args )->inContentLanguage()->text();
3193                 } else {
3194                         $summary = wfMsgReplaceArgs( $summary, $args );
3195                 }
3196
3197                 // Trim spaces on user supplied text
3198                 $summary = trim( $summary );
3199
3200                 // Save
3201                 $flags = EDIT_UPDATE | EDIT_INTERNAL;
3202
3203                 if ( $guser->isAllowed( 'minoredit' ) ) {
3204                         $flags |= EDIT_MINOR;
3205                 }
3206
3207                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3208                         $flags |= EDIT_FORCE_BOT;
3209                 }
3210
3211                 $targetContent = $target->getContent();
3212                 $changingContentModel = $targetContent->getModel() !== $current->getContentModel();
3213
3214                 // Actually store the edit
3215                 $status = $this->doEditContent(
3216                         $targetContent,
3217                         $summary,
3218                         $flags,
3219                         $target->getId(),
3220                         $guser,
3221                         null,
3222                         $tags
3223                 );
3224
3225                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3226                 // This is done even on edit failure to have patrolling in that case (T64157).
3227                 $set = [];
3228                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3229                         // Mark all reverted edits as bot
3230                         $set['rc_bot'] = 1;
3231                 }
3232
3233                 if ( $wgUseRCPatrol ) {
3234                         // Mark all reverted edits as patrolled
3235                         $set['rc_patrolled'] = 1;
3236                 }
3237
3238                 if ( count( $set ) ) {
3239                         $dbw->update( 'recentchanges', $set,
3240                                 [ /* WHERE */
3241                                         'rc_cur_id' => $current->getPage(),
3242                                         'rc_user_text' => $current->getUserText(),
3243                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3244                                 ],
3245                                 __METHOD__
3246                         );
3247                 }
3248
3249                 if ( !$status->isOK() ) {
3250                         return $status->getErrorsArray();
3251                 }
3252
3253                 // raise error, when the edit is an edit without a new version
3254                 $statusRev = isset( $status->value['revision'] )
3255                         ? $status->value['revision']
3256                         : null;
3257                 if ( !( $statusRev instanceof Revision ) ) {
3258                         $resultDetails = [ 'current' => $current ];
3259                         return [ [ 'alreadyrolled',
3260                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3261                                         htmlspecialchars( $fromP ),
3262                                         htmlspecialchars( $current->getUserText() )
3263                         ] ];
3264                 }
3265
3266                 if ( $changingContentModel ) {
3267                         // If the content model changed during the rollback,
3268                         // make sure it gets logged to Special:Log/contentmodel
3269                         $log = new ManualLogEntry( 'contentmodel', 'change' );
3270                         $log->setPerformer( $guser );
3271                         $log->setTarget( $this->mTitle );
3272                         $log->setComment( $summary );
3273                         $log->setParameters( [
3274                                 '4::oldmodel' => $current->getContentModel(),
3275                                 '5::newmodel' => $targetContent->getModel(),
3276                         ] );
3277
3278                         $logId = $log->insert( $dbw );
3279                         $log->publish( $logId );
3280                 }
3281
3282                 $revId = $statusRev->getId();
3283
3284                 Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );
3285
3286                 $resultDetails = [
3287                         'summary' => $summary,
3288                         'current' => $current,
3289                         'target' => $target,
3290                         'newid' => $revId
3291                 ];
3292
3293                 return [];
3294         }
3295
3296         /**
3297          * The onArticle*() functions are supposed to be a kind of hooks
3298          * which should be called whenever any of the specified actions
3299          * are done.
3300          *
3301          * This is a good place to put code to clear caches, for instance.
3302          *
3303          * This is called on page move and undelete, as well as edit
3304          *
3305          * @param Title $title
3306          */
3307         public static function onArticleCreate( Title $title ) {
3308                 // Update existence markers on article/talk tabs...
3309                 $other = $title->getOtherPage();
3310
3311                 $other->purgeSquid();
3312
3313                 $title->touchLinks();
3314                 $title->purgeSquid();
3315                 $title->deleteTitleProtection();
3316
3317                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3318
3319                 // Invalidate caches of articles which include this page
3320                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3321
3322                 if ( $title->getNamespace() == NS_CATEGORY ) {
3323                         // Load the Category object, which will schedule a job to create
3324                         // the category table row if necessary. Checking a replica DB is ok
3325                         // here, in the worst case it'll run an unnecessary recount job on
3326                         // a category that probably doesn't have many members.
3327                         Category::newFromTitle( $title )->getID();
3328                 }
3329         }
3330
3331         /**
3332          * Clears caches when article is deleted
3333          *
3334          * @param Title $title
3335          */
3336         public static function onArticleDelete( Title $title ) {
3337                 // Update existence markers on article/talk tabs...
3338                 $other = $title->getOtherPage();
3339
3340                 $other->purgeSquid();
3341
3342                 $title->touchLinks();
3343                 $title->purgeSquid();
3344
3345                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3346
3347                 // File cache
3348                 HTMLFileCache::clearFileCache( $title );
3349                 InfoAction::invalidateCache( $title );
3350
3351                 // Messages
3352                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3353                         MessageCache::singleton()->updateMessageOverride( $title, null );
3354                 }
3355
3356                 // Images
3357                 if ( $title->getNamespace() == NS_FILE ) {
3358                         DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
3359                 }
3360
3361                 // User talk pages
3362                 if ( $title->getNamespace() == NS_USER_TALK ) {
3363                         $user = User::newFromName( $title->getText(), false );
3364                         if ( $user ) {
3365                                 $user->setNewtalk( false );
3366                         }
3367                 }
3368
3369                 // Image redirects
3370                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3371         }
3372
3373         /**
3374          * Purge caches on page update etc
3375          *
3376          * @param Title $title
3377          * @param Revision|null $revision Revision that was just saved, may be null
3378          */
3379         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3380                 // Invalidate caches of articles which include this page
3381                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3382
3383                 // Invalidate the caches of all pages which redirect here
3384                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
3385
3386                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3387
3388                 // Purge CDN for this page only
3389                 $title->purgeSquid();
3390                 // Clear file cache for this page only
3391                 HTMLFileCache::clearFileCache( $title );
3392
3393                 $revid = $revision ? $revision->getId() : null;
3394                 DeferredUpdates::addCallableUpdate( function () use ( $title, $revid ) {
3395                         InfoAction::invalidateCache( $title, $revid );
3396                 } );
3397         }
3398
3399         /**#@-*/
3400
3401         /**
3402          * Returns a list of categories this page is a member of.
3403          * Results will include hidden categories
3404          *
3405          * @return TitleArray
3406          */
3407         public function getCategories() {
3408                 $id = $this->getId();
3409                 if ( $id == 0 ) {
3410                         return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
3411                 }
3412
3413                 $dbr = wfGetDB( DB_REPLICA );
3414                 $res = $dbr->select( 'categorylinks',
3415                         [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
3416                         // Have to do that since Database::fieldNamesWithAlias treats numeric indexes
3417                         // as not being aliases, and NS_CATEGORY is numeric
3418                         [ 'cl_from' => $id ],
3419                         __METHOD__ );
3420
3421                 return TitleArray::newFromResult( $res );
3422         }
3423
3424         /**
3425          * Returns a list of hidden categories this page is a member of.
3426          * Uses the page_props and categorylinks tables.
3427          *
3428          * @return array Array of Title objects
3429          */
3430         public function getHiddenCategories() {
3431                 $result = [];
3432                 $id = $this->getId();
3433
3434                 if ( $id == 0 ) {
3435                         return [];
3436                 }
3437
3438                 $dbr = wfGetDB( DB_REPLICA );
3439                 $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
3440                         [ 'cl_to' ],
3441                         [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3442                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
3443                         __METHOD__ );
3444
3445                 if ( $res !== false ) {
3446                         foreach ( $res as $row ) {
3447                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3448                         }
3449                 }
3450
3451                 return $result;
3452         }
3453
3454         /**
3455          * Auto-generates a deletion reason
3456          *
3457          * @param bool &$hasHistory Whether the page has a history
3458          * @return string|bool String containing deletion reason or empty string, or boolean false
3459          *    if no revision occurred
3460          */
3461         public function getAutoDeleteReason( &$hasHistory ) {
3462                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3463         }
3464
3465         /**
3466          * Update all the appropriate counts in the category table, given that
3467          * we've added the categories $added and deleted the categories $deleted.
3468          *
3469          * This should only be called from deferred updates or jobs to avoid contention.
3470          *
3471          * @param array $added The names of categories that were added
3472          * @param array $deleted The names of categories that were deleted
3473          * @param int $id Page ID (this should be the original deleted page ID)
3474          */
3475         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
3476                 $id = $id ?: $this->getId();
3477                 $ns = $this->getTitle()->getNamespace();
3478
3479                 $addFields = [ 'cat_pages = cat_pages + 1' ];
3480                 $removeFields = [ 'cat_pages = cat_pages - 1' ];
3481                 if ( $ns == NS_CATEGORY ) {
3482                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3483                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3484                 } elseif ( $ns == NS_FILE ) {
3485                         $addFields[] = 'cat_files = cat_files + 1';
3486                         $removeFields[] = 'cat_files = cat_files - 1';
3487                 }
3488
3489                 $dbw = wfGetDB( DB_MASTER );
3490
3491                 if ( count( $added ) ) {
3492                         $existingAdded = $dbw->selectFieldValues(
3493                                 'category',
3494                                 'cat_title',
3495                                 [ 'cat_title' => $added ],
3496                                 __METHOD__
3497                         );
3498
3499                         // For category rows that already exist, do a plain
3500                         // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
3501                         // to avoid creating gaps in the cat_id sequence.
3502                         if ( count( $existingAdded ) ) {
3503                                 $dbw->update(
3504                                         'category',
3505                                         $addFields,
3506                                         [ 'cat_title' => $existingAdded ],
3507                                         __METHOD__
3508                                 );
3509                         }
3510
3511                         $missingAdded = array_diff( $added, $existingAdded );
3512                         if ( count( $missingAdded ) ) {
3513                                 $insertRows = [];
3514                                 foreach ( $missingAdded as $cat ) {
3515                                         $insertRows[] = [
3516                                                 'cat_title'   => $cat,
3517                                                 'cat_pages'   => 1,
3518                                                 'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3519                                                 'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3520                                         ];
3521                                 }
3522                                 $dbw->upsert(
3523                                         'category',
3524                                         $insertRows,
3525                                         [ 'cat_title' ],
3526                                         $addFields,
3527                                         __METHOD__
3528                                 );
3529                         }
3530                 }
3531
3532                 if ( count( $deleted ) ) {
3533                         $dbw->update(
3534                                 'category',
3535                                 $removeFields,
3536                                 [ 'cat_title' => $deleted ],
3537                                 __METHOD__
3538                         );
3539                 }
3540
3541                 foreach ( $added as $catName ) {
3542                         $cat = Category::newFromName( $catName );
3543                         Hooks::run( 'CategoryAfterPageAdded', [ $cat, $this ] );
3544                 }
3545
3546                 foreach ( $deleted as $catName ) {
3547                         $cat = Category::newFromName( $catName );
3548                         Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $this, $id ] );
3549                 }
3550
3551                 // Refresh counts on categories that should be empty now, to
3552                 // trigger possible deletion. Check master for the most
3553                 // up-to-date cat_pages.
3554                 if ( count( $deleted ) ) {
3555                         $rows = $dbw->select(
3556                                 'category',
3557                                 [ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ],
3558                                 [ 'cat_title' => $deleted, 'cat_pages <= 0' ],
3559                                 __METHOD__
3560                         );
3561                         foreach ( $rows as $row ) {
3562                                 $cat = Category::newFromRow( $row );
3563                                 // T166757: do the update after this DB commit
3564                                 DeferredUpdates::addCallableUpdate( function () use ( $cat ) {
3565                                         $cat->refreshCounts();
3566                                 } );
3567                         }
3568                 }
3569         }
3570
3571         /**
3572          * Opportunistically enqueue link update jobs given fresh parser output if useful
3573          *
3574          * @param ParserOutput $parserOutput Current version page output
3575          * @since 1.25
3576          */
3577         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3578                 if ( wfReadOnly() ) {
3579                         return;
3580                 }
3581
3582                 if ( !Hooks::run( 'OpportunisticLinksUpdate',
3583                         [ $this, $this->mTitle, $parserOutput ]
3584                 ) ) {
3585                         return;
3586                 }
3587
3588                 $config = RequestContext::getMain()->getConfig();
3589
3590                 $params = [
3591                         'isOpportunistic' => true,
3592                         'rootJobTimestamp' => $parserOutput->getCacheTime()
3593                 ];
3594
3595                 if ( $this->mTitle->areRestrictionsCascading() ) {
3596                         // If the page is cascade protecting, the links should really be up-to-date
3597                         JobQueueGroup::singleton()->lazyPush(
3598                                 RefreshLinksJob::newPrioritized( $this->mTitle, $params )
3599                         );
3600                 } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
3601                         // Assume the output contains "dynamic" time/random based magic words.
3602                         // Only update pages that expired due to dynamic content and NOT due to edits
3603                         // to referenced templates/files. When the cache expires due to dynamic content,
3604                         // page_touched is unchanged. We want to avoid triggering redundant jobs due to
3605                         // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
3606                         // template/file edit already triggered recursive RefreshLinksJob jobs.
3607                         if ( $this->getLinksTimestamp() > $this->getTouched() ) {
3608                                 // If a page is uncacheable, do not keep spamming a job for it.
3609                                 // Although it would be de-duplicated, it would still waste I/O.
3610                                 $cache = ObjectCache::getLocalClusterInstance();
3611                                 $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
3612                                 $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
3613                                 if ( $cache->add( $key, time(), $ttl ) ) {
3614                                         JobQueueGroup::singleton()->lazyPush(
3615                                                 RefreshLinksJob::newDynamic( $this->mTitle, $params )
3616                                         );
3617                                 }
3618                         }
3619                 }
3620         }
3621
3622         /**
3623          * Returns a list of updates to be performed when this page is deleted. The
3624          * updates should remove any information about this page from secondary data
3625          * stores such as links tables.
3626          *
3627          * @param Content|null $content Optional Content object for determining the
3628          *   necessary updates.
3629          * @return DeferrableUpdate[]
3630          */
3631         public function getDeletionUpdates( Content $content = null ) {
3632                 if ( !$content ) {
3633                         // load content object, which may be used to determine the necessary updates.
3634                         // XXX: the content may not be needed to determine the updates.
3635                         try {
3636                                 $content = $this->getContent( Revision::RAW );
3637                         } catch ( Exception $ex ) {
3638                                 // If we can't load the content, something is wrong. Perhaps that's why
3639                                 // the user is trying to delete the page, so let's not fail in that case.
3640                                 // Note that doDeleteArticleReal() will already have logged an issue with
3641                                 // loading the content.
3642                         }
3643                 }
3644
3645                 if ( !$content ) {
3646                         $updates = [];
3647                 } else {
3648                         $updates = $content->getDeletionUpdates( $this );
3649                 }
3650
3651                 Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
3652                 return $updates;
3653         }
3654
3655         /**
3656          * Whether this content displayed on this page
3657          * comes from the local database
3658          *
3659          * @since 1.28
3660          * @return bool
3661          */
3662         public function isLocal() {
3663                 return true;
3664         }
3665
3666         /**
3667          * The display name for the site this content
3668          * come from. If a subclass overrides isLocal(),
3669          * this could return something other than the
3670          * current site name
3671          *
3672          * @since 1.28
3673          * @return string
3674          */
3675         public function getWikiDisplayName() {
3676                 global $wgSitename;
3677                 return $wgSitename;
3678         }
3679
3680         /**
3681          * Get the source URL for the content on this page,
3682          * typically the canonical URL, but may be a remote
3683          * link if the content comes from another site
3684          *
3685          * @since 1.28
3686          * @return string
3687          */
3688         public function getSourceURL() {
3689                 return $this->getTitle()->getCanonicalURL();
3690         }
3691
3692         /**
3693          * @param WANObjectCache $cache
3694          * @return string[]
3695          * @since 1.28
3696          */
3697         public function getMutableCacheKeys( WANObjectCache $cache ) {
3698                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
3699
3700                 return $linkCache->getMutableCacheKeys( $cache, $this->getTitle()->getTitleValue() );
3701         }
3702 }