includes/page/WikiPage.php

   1 <?php
   2 /**
   3  * Base representation for a MediaWiki page.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use \MediaWiki\Logger\LoggerFactory;
  24 use \MediaWiki\MediaWikiServices;
  25 use Wikimedia\Rdbms\FakeResultWrapper;
  26 use Wikimedia\Rdbms\IDatabase;
  27
  28 /**
  29  * Class representing a MediaWiki article and history.
  30  *
  31  * Some fields are public only for backwards-compatibility. Use accessors.
  32  * In the past, this class was part of Article.php and everything was public.
  33  */
  34 class WikiPage implements Page, IDBAccessObject {
  35         // Constants for $mDataLoadedFrom and related
  36
  37         /**
  38          * @var Title
  39          */
  40         public $mTitle = null;
  41
  42         /**@{{
  43          * @protected
  44          */
  45         public $mDataLoaded = false;         // !< Boolean
  46         public $mIsRedirect = false;         // !< Boolean
  47         public $mLatest = false;             // !< Integer (false means "not loaded")
  48         /**@}}*/
  49
  50         /** @var stdClass Map of cache fields (text, parser output, ect) for a proposed/new edit */
  51         public $mPreparedEdit = false;
  52
  53         /**
  54          * @var int
  55          */
  56         protected $mId = null;
  57
  58         /**
  59          * @var int One of the READ_* constants
  60          */
  61         protected $mDataLoadedFrom = self::READ_NONE;
  62
  63         /**
  64          * @var Title
  65          */
  66         protected $mRedirectTarget = null;
  67
  68         /**
  69          * @var Revision
  70          */
  71         protected $mLastRevision = null;
  72
  73         /**
  74          * @var string Timestamp of the current revision or empty string if not loaded
  75          */
  76         protected $mTimestamp = '';
  77
  78         /**
  79          * @var string
  80          */
  81         protected $mTouched = '19700101000000';
  82
  83         /**
  84          * @var string
  85          */
  86         protected $mLinksUpdated = '19700101000000';
  87
  88         const PURGE_CDN_CACHE = 1; // purge CDN cache for page variant URLs
  89         const PURGE_CLUSTER_PCACHE = 2; // purge parser cache in the local datacenter
  90         const PURGE_GLOBAL_PCACHE = 4; // set page_touched to clear parser cache in all datacenters
  91         const PURGE_ALL = 7;
  92
  93         /**
  94          * Constructor and clear the article
  95          * @param Title $title Reference to a Title object.
  96          */
  97         public function __construct( Title $title ) {
  98                 $this->mTitle = $title;
  99         }
 100
 101         /**
 102          * Makes sure that the mTitle object is cloned
 103          * to the newly cloned WikiPage.
 104          */
 105         public function __clone() {
 106                 $this->mTitle = clone $this->mTitle;
 107         }
 108
 109         /**
 110          * Create a WikiPage object of the appropriate class for the given title.
 111          *
 112          * @param Title $title
 113          *
 114          * @throws MWException
 115          * @return WikiPage|WikiCategoryPage|WikiFilePage
 116          */
 117         public static function factory( Title $title ) {
 118                 $ns = $title->getNamespace();
 119
 120                 if ( $ns == NS_MEDIA ) {
 121                         throw new MWException( "NS_MEDIA is a virtual namespace; use NS_FILE." );
 122                 } elseif ( $ns < 0 ) {
 123                         throw new MWException( "Invalid or virtual namespace $ns given." );
 124                 }
 125
 126                 $page = null;
 127                 if ( !Hooks::run( 'WikiPageFactory', [ $title, &$page ] ) ) {
 128                         return $page;
 129                 }
 130
 131                 switch ( $ns ) {
 132                         case NS_FILE:
 133                                 $page = new WikiFilePage( $title );
 134                                 break;
 135                         case NS_CATEGORY:
 136                                 $page = new WikiCategoryPage( $title );
 137                                 break;
 138                         default:
 139                                 $page = new WikiPage( $title );
 140                 }
 141
 142                 return $page;
 143         }
 144
 145         /**
 146          * Constructor from a page id
 147          *
 148          * @param int $id Article ID to load
 149          * @param string|int $from One of the following values:
 150          *        - "fromdb" or WikiPage::READ_NORMAL to select from a replica DB
 151          *        - "fromdbmaster" or WikiPage::READ_LATEST to select from the master database
 152          *
 153          * @return WikiPage|null
 154          */
 155         public static function newFromID( $id, $from = 'fromdb' ) {
 156                 // page ids are never 0 or negative, see T63166
 157                 if ( $id < 1 ) {
 158                         return null;
 159                 }
 160
 161                 $from = self::convertSelectType( $from );
 162                 $db = wfGetDB( $from === self::READ_LATEST ? DB_MASTER : DB_REPLICA );
 163                 $row = $db->selectRow(
 164                         'page', self::selectFields(), [ 'page_id' => $id ], __METHOD__ );
 165                 if ( !$row ) {
 166                         return null;
 167                 }
 168                 return self::newFromRow( $row, $from );
 169         }
 170
 171         /**
 172          * Constructor from a database row
 173          *
 174          * @since 1.20
 175          * @param object $row Database row containing at least fields returned by selectFields().
 176          * @param string|int $from Source of $data:
 177          *        - "fromdb" or WikiPage::READ_NORMAL: from a replica DB
 178          *        - "fromdbmaster" or WikiPage::READ_LATEST: from the master DB
 179          *        - "forupdate" or WikiPage::READ_LOCKING: from the master DB using SELECT FOR UPDATE
 180          * @return WikiPage
 181          */
 182         public static function newFromRow( $row, $from = 'fromdb' ) {
 183                 $page = self::factory( Title::newFromRow( $row ) );
 184                 $page->loadFromRow( $row, $from );
 185                 return $page;
 186         }
 187
 188         /**
 189          * Convert 'fromdb', 'fromdbmaster' and 'forupdate' to READ_* constants.
 190          *
 191          * @param object|string|int $type
 192          * @return mixed
 193          */
 194         private static function convertSelectType( $type ) {
 195                 switch ( $type ) {
 196                 case 'fromdb':
 197                         return self::READ_NORMAL;
 198                 case 'fromdbmaster':
 199                         return self::READ_LATEST;
 200                 case 'forupdate':
 201                         return self::READ_LOCKING;
 202                 default:
 203                         // It may already be an integer or whatever else
 204                         return $type;
 205                 }
 206         }
 207
 208         /**
 209          * @todo Move this UI stuff somewhere else
 210          *
 211          * @see ContentHandler::getActionOverrides
 212          */
 213         public function getActionOverrides() {
 214                 return $this->getContentHandler()->getActionOverrides();
 215         }
 216
 217         /**
 218          * Returns the ContentHandler instance to be used to deal with the content of this WikiPage.
 219          *
 220          * Shorthand for ContentHandler::getForModelID( $this->getContentModel() );
 221          *
 222          * @return ContentHandler
 223          *
 224          * @since 1.21
 225          */
 226         public function getContentHandler() {
 227                 return ContentHandler::getForModelID( $this->getContentModel() );
 228         }
 229
 230         /**
 231          * Get the title object of the article
 232          * @return Title Title object of this page
 233          */
 234         public function getTitle() {
 235                 return $this->mTitle;
 236         }
 237
 238         /**
 239          * Clear the object
 240          * @return void
 241          */
 242         public function clear() {
 243                 $this->mDataLoaded = false;
 244                 $this->mDataLoadedFrom = self::READ_NONE;
 245
 246                 $this->clearCacheFields();
 247         }
 248
 249         /**
 250          * Clear the object cache fields
 251          * @return void
 252          */
 253         protected function clearCacheFields() {
 254                 $this->mId = null;
 255                 $this->mRedirectTarget = null; // Title object if set
 256                 $this->mLastRevision = null; // Latest revision
 257                 $this->mTouched = '19700101000000';
 258                 $this->mLinksUpdated = '19700101000000';
 259                 $this->mTimestamp = '';
 260                 $this->mIsRedirect = false;
 261                 $this->mLatest = false;
 262                 // T59026: do not clear mPreparedEdit since prepareTextForEdit() already checks
 263                 // the requested rev ID and content against the cached one for equality. For most
 264                 // content types, the output should not change during the lifetime of this cache.
 265                 // Clearing it can cause extra parses on edit for no reason.
 266         }
 267
 268         /**
 269          * Clear the mPreparedEdit cache field, as may be needed by mutable content types
 270          * @return void
 271          * @since 1.23
 272          */
 273         public function clearPreparedEdit() {
 274                 $this->mPreparedEdit = false;
 275         }
 276
 277         /**
 278          * Return the list of revision fields that should be selected to create
 279          * a new page.
 280          *
 281          * @return array
 282          */
 283         public static function selectFields() {
 284                 global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
 285
 286                 $fields = [
 287                         'page_id',
 288                         'page_namespace',
 289                         'page_title',
 290                         'page_restrictions',
 291                         'page_is_redirect',
 292                         'page_is_new',
 293                         'page_random',
 294                         'page_touched',
 295                         'page_links_updated',
 296                         'page_latest',
 297                         'page_len',
 298                 ];
 299
 300                 if ( $wgContentHandlerUseDB ) {
 301                         $fields[] = 'page_content_model';
 302                 }
 303
 304                 if ( $wgPageLanguageUseDB ) {
 305                         $fields[] = 'page_lang';
 306                 }
 307
 308                 return $fields;
 309         }
 310
 311         /**
 312          * Fetch a page record with the given conditions
 313          * @param IDatabase $dbr
 314          * @param array $conditions
 315          * @param array $options
 316          * @return object|bool Database result resource, or false on failure
 317          */
 318         protected function pageData( $dbr, $conditions, $options = [] ) {
 319                 $fields = self::selectFields();
 320
 321                 // Avoid PHP 7.1 warning of passing $this by reference
 322                 $wikiPage = $this;
 323
 324                 Hooks::run( 'ArticlePageDataBefore', [ &$wikiPage, &$fields ] );
 325
 326                 $row = $dbr->selectRow( 'page', $fields, $conditions, __METHOD__, $options );
 327
 328                 Hooks::run( 'ArticlePageDataAfter', [ &$wikiPage, &$row ] );
 329
 330                 return $row;
 331         }
 332
 333         /**
 334          * Fetch a page record matching the Title object's namespace and title
 335          * using a sanitized title string
 336          *
 337          * @param IDatabase $dbr
 338          * @param Title $title
 339          * @param array $options
 340          * @return object|bool Database result resource, or false on failure
 341          */
 342         public function pageDataFromTitle( $dbr, $title, $options = [] ) {
 343                 return $this->pageData( $dbr, [
 344                         'page_namespace' => $title->getNamespace(),
 345                         'page_title' => $title->getDBkey() ], $options );
 346         }
 347
 348         /**
 349          * Fetch a page record matching the requested ID
 350          *
 351          * @param IDatabase $dbr
 352          * @param int $id
 353          * @param array $options
 354          * @return object|bool Database result resource, or false on failure
 355          */
 356         public function pageDataFromId( $dbr, $id, $options = [] ) {
 357                 return $this->pageData( $dbr, [ 'page_id' => $id ], $options );
 358         }
 359
 360         /**
 361          * Load the object from a given source by title
 362          *
 363          * @param object|string|int $from One of the following:
 364          *   - A DB query result object.
 365          *   - "fromdb" or WikiPage::READ_NORMAL to get from a replica DB.
 366          *   - "fromdbmaster" or WikiPage::READ_LATEST to get from the master DB.
 367          *   - "forupdate"  or WikiPage::READ_LOCKING to get from the master DB
 368          *     using SELECT FOR UPDATE.
 369          *
 370          * @return void
 371          */
 372         public function loadPageData( $from = 'fromdb' ) {
 373                 $from = self::convertSelectType( $from );
 374                 if ( is_int( $from ) && $from <= $this->mDataLoadedFrom ) {
 375                         // We already have the data from the correct location, no need to load it twice.
 376                         return;
 377                 }
 378
 379                 if ( is_int( $from ) ) {
 380                         list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 381                         $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 382
 383                         if ( !$data
 384                                 && $index == DB_REPLICA
 385                                 && wfGetLB()->getServerCount() > 1
 386                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
 387                         ) {
 388                                 $from = self::READ_LATEST;
 389                                 list( $index, $opts ) = DBAccessObjectUtils::getDBOptions( $from );
 390                                 $data = $this->pageDataFromTitle( wfGetDB( $index ), $this->mTitle, $opts );
 391                         }
 392                 } else {
 393                         // No idea from where the caller got this data, assume replica DB.
 394                         $data = $from;
 395                         $from = self::READ_NORMAL;
 396                 }
 397
 398                 $this->loadFromRow( $data, $from );
 399         }
 400
 401         /**
 402          * Load the object from a database row
 403          *
 404          * @since 1.20
 405          * @param object|bool $data DB row containing fields returned by selectFields() or false
 406          * @param string|int $from One of the following:
 407          *        - "fromdb" or WikiPage::READ_NORMAL if the data comes from a replica DB
 408          *        - "fromdbmaster" or WikiPage::READ_LATEST if the data comes from the master DB
 409          *        - "forupdate"  or WikiPage::READ_LOCKING if the data comes from
 410          *          the master DB using SELECT FOR UPDATE
 411          */
 412         public function loadFromRow( $data, $from ) {
 413                 $lc = LinkCache::singleton();
 414                 $lc->clearLink( $this->mTitle );
 415
 416                 if ( $data ) {
 417                         $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 418
 419                         $this->mTitle->loadFromRow( $data );
 420
 421                         // Old-fashioned restrictions
 422                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 423
 424                         $this->mId = intval( $data->page_id );
 425                         $this->mTouched = wfTimestamp( TS_MW, $data->page_touched );
 426                         $this->mLinksUpdated = wfTimestampOrNull( TS_MW, $data->page_links_updated );
 427                         $this->mIsRedirect = intval( $data->page_is_redirect );
 428                         $this->mLatest = intval( $data->page_latest );
 429                         // T39225: $latest may no longer match the cached latest Revision object.
 430                         // Double-check the ID of any cached latest Revision object for consistency.
 431                         if ( $this->mLastRevision && $this->mLastRevision->getId() != $this->mLatest ) {
 432                                 $this->mLastRevision = null;
 433                                 $this->mTimestamp = '';
 434                         }
 435                 } else {
 436                         $lc->addBadLinkObj( $this->mTitle );
 437
 438                         $this->mTitle->loadFromRow( false );
 439
 440                         $this->clearCacheFields();
 441
 442                         $this->mId = 0;
 443                 }
 444
 445                 $this->mDataLoaded = true;
 446                 $this->mDataLoadedFrom = self::convertSelectType( $from );
 447         }
 448
 449         /**
 450          * @return int Page ID
 451          */
 452         public function getId() {
 453                 if ( !$this->mDataLoaded ) {
 454                         $this->loadPageData();
 455                 }
 456                 return $this->mId;
 457         }
 458
 459         /**
 460          * @return bool Whether or not the page exists in the database
 461          */
 462         public function exists() {
 463                 if ( !$this->mDataLoaded ) {
 464                         $this->loadPageData();
 465                 }
 466                 return $this->mId > 0;
 467         }
 468
 469         /**
 470          * Check if this page is something we're going to be showing
 471          * some sort of sensible content for. If we return false, page
 472          * views (plain action=view) will return an HTTP 404 response,
 473          * so spiders and robots can know they're following a bad link.
 474          *
 475          * @return bool
 476          */
 477         public function hasViewableContent() {
 478                 return $this->mTitle->isKnown();
 479         }
 480
 481         /**
 482          * Tests if the article content represents a redirect
 483          *
 484          * @return bool
 485          */
 486         public function isRedirect() {
 487                 if ( !$this->mDataLoaded ) {
 488                         $this->loadPageData();
 489                 }
 490
 491                 return (bool)$this->mIsRedirect;
 492         }
 493
 494         /**
 495          * Returns the page's content model id (see the CONTENT_MODEL_XXX constants).
 496          *
 497          * Will use the revisions actual content model if the page exists,
 498          * and the page's default if the page doesn't exist yet.
 499          *
 500          * @return string
 501          *
 502          * @since 1.21
 503          */
 504         public function getContentModel() {
 505                 if ( $this->exists() ) {
 506                         $cache = ObjectCache::getMainWANInstance();
 507
 508                         return $cache->getWithSetCallback(
 509                                 $cache->makeKey( 'page', 'content-model', $this->getLatest() ),
 510                                 $cache::TTL_MONTH,
 511                                 function () {
 512                                         $rev = $this->getRevision();
 513                                         if ( $rev ) {
 514                                                 // Look at the revision's actual content model
 515                                                 return $rev->getContentModel();
 516                                         } else {
 517                                                 $title = $this->mTitle->getPrefixedDBkey();
 518                                                 wfWarn( "Page $title exists but has no (visible) revisions!" );
 519                                                 return $this->mTitle->getContentModel();
 520                                         }
 521                                 }
 522                         );
 523                 }
 524
 525                 // use the default model for this page
 526                 return $this->mTitle->getContentModel();
 527         }
 528
 529         /**
 530          * Loads page_touched and returns a value indicating if it should be used
 531          * @return bool True if this page exists and is not a redirect
 532          */
 533         public function checkTouched() {
 534                 if ( !$this->mDataLoaded ) {
 535                         $this->loadPageData();
 536                 }
 537                 return ( $this->mId && !$this->mIsRedirect );
 538         }
 539
 540         /**
 541          * Get the page_touched field
 542          * @return string Containing GMT timestamp
 543          */
 544         public function getTouched() {
 545                 if ( !$this->mDataLoaded ) {
 546                         $this->loadPageData();
 547                 }
 548                 return $this->mTouched;
 549         }
 550
 551         /**
 552          * Get the page_links_updated field
 553          * @return string|null Containing GMT timestamp
 554          */
 555         public function getLinksTimestamp() {
 556                 if ( !$this->mDataLoaded ) {
 557                         $this->loadPageData();
 558                 }
 559                 return $this->mLinksUpdated;
 560         }
 561
 562         /**
 563          * Get the page_latest field
 564          * @return int The rev_id of current revision
 565          */
 566         public function getLatest() {
 567                 if ( !$this->mDataLoaded ) {
 568                         $this->loadPageData();
 569                 }
 570                 return (int)$this->mLatest;
 571         }
 572
 573         /**
 574          * Get the Revision object of the oldest revision
 575          * @return Revision|null
 576          */
 577         public function getOldestRevision() {
 578
 579                 // Try using the replica DB first, then try the master
 580                 $continue = 2;
 581                 $db = wfGetDB( DB_REPLICA );
 582                 $revSelectFields = Revision::selectFields();
 583
 584                 $row = null;
 585                 while ( $continue ) {
 586                         $row = $db->selectRow(
 587                                 [ 'revision' ],
 588                                 $revSelectFields,
 589                                 [
 590                                         'rev_page' => $this->getId()
 591                                 ],
 592                                 __METHOD__,
 593                                 [
 594                                         'ORDER BY' => 'rev_timestamp ASC'
 595                                 ]
 596                         );
 597
 598                         if ( $row ) {
 599                                 $continue = 0;
 600                         } else {
 601                                 $db = wfGetDB( DB_MASTER );
 602                                 $continue--;
 603                         }
 604                 }
 605
 606                 return $row ? Revision::newFromRow( $row ) : null;
 607         }
 608
 609         /**
 610          * Loads everything except the text
 611          * This isn't necessary for all uses, so it's only done if needed.
 612          */
 613         protected function loadLastEdit() {
 614                 if ( $this->mLastRevision !== null ) {
 615                         return; // already loaded
 616                 }
 617
 618                 $latest = $this->getLatest();
 619                 if ( !$latest ) {
 620                         return; // page doesn't exist or is missing page_latest info
 621                 }
 622
 623                 if ( $this->mDataLoadedFrom == self::READ_LOCKING ) {
 624                         // T39225: if session S1 loads the page row FOR UPDATE, the result always
 625                         // includes the latest changes committed. This is true even within REPEATABLE-READ
 626                         // transactions, where S1 normally only sees changes committed before the first S1
 627                         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
 628                         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
 629                         // happened after the first S1 SELECT.
 630                         // https://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
 631                         $flags = Revision::READ_LOCKING;
 632                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 633                 } elseif ( $this->mDataLoadedFrom == self::READ_LATEST ) {
 634                         // Bug T93976: if page_latest was loaded from the master, fetch the
 635                         // revision from there as well, as it may not exist yet on a replica DB.
 636                         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
 637                         $flags = Revision::READ_LATEST;
 638                         $revision = Revision::newFromPageId( $this->getId(), $latest, $flags );
 639                 } else {
 640                         $dbr = wfGetDB( DB_REPLICA );
 641                         $revision = Revision::newKnownCurrent( $dbr, $this->getId(), $latest );
 642                 }
 643
 644                 if ( $revision ) { // sanity
 645                         $this->setLastEdit( $revision );
 646                 }
 647         }
 648
 649         /**
 650          * Set the latest revision
 651          * @param Revision $revision
 652          */
 653         protected function setLastEdit( Revision $revision ) {
 654                 $this->mLastRevision = $revision;
 655                 $this->mTimestamp = $revision->getTimestamp();
 656         }
 657
 658         /**
 659          * Get the latest revision
 660          * @return Revision|null
 661          */
 662         public function getRevision() {
 663                 $this->loadLastEdit();
 664                 if ( $this->mLastRevision ) {
 665                         return $this->mLastRevision;
 666                 }
 667                 return null;
 668         }
 669
 670         /**
 671          * Get the content of the current revision. No side-effects...
 672          *
 673          * @param int $audience One of:
 674          *   Revision::FOR_PUBLIC       to be displayed to all users
 675          *   Revision::FOR_THIS_USER    to be displayed to $wgUser
 676          *   Revision::RAW              get the text regardless of permissions
 677          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 678          *   to the $audience parameter
 679          * @return Content|null The content of the current revision
 680          *
 681          * @since 1.21
 682          */
 683         public function getContent( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 684                 $this->loadLastEdit();
 685                 if ( $this->mLastRevision ) {
 686                         return $this->mLastRevision->getContent( $audience, $user );
 687                 }
 688                 return null;
 689         }
 690
 691         /**
 692          * @return string MW timestamp of last article revision
 693          */
 694         public function getTimestamp() {
 695                 // Check if the field has been filled by WikiPage::setTimestamp()
 696                 if ( !$this->mTimestamp ) {
 697                         $this->loadLastEdit();
 698                 }
 699
 700                 return wfTimestamp( TS_MW, $this->mTimestamp );
 701         }
 702
 703         /**
 704          * Set the page timestamp (use only to avoid DB queries)
 705          * @param string $ts MW timestamp of last article revision
 706          * @return void
 707          */
 708         public function setTimestamp( $ts ) {
 709                 $this->mTimestamp = wfTimestamp( TS_MW, $ts );
 710         }
 711
 712         /**
 713          * @param int $audience One of:
 714          *   Revision::FOR_PUBLIC       to be displayed to all users
 715          *   Revision::FOR_THIS_USER    to be displayed to the given user
 716          *   Revision::RAW              get the text regardless of permissions
 717          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 718          *   to the $audience parameter
 719          * @return int User ID for the user that made the last article revision
 720          */
 721         public function getUser( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 722                 $this->loadLastEdit();
 723                 if ( $this->mLastRevision ) {
 724                         return $this->mLastRevision->getUser( $audience, $user );
 725                 } else {
 726                         return -1;
 727                 }
 728         }
 729
 730         /**
 731          * Get the User object of the user who created the page
 732          * @param int $audience One of:
 733          *   Revision::FOR_PUBLIC       to be displayed to all users
 734          *   Revision::FOR_THIS_USER    to be displayed to the given user
 735          *   Revision::RAW              get the text regardless of permissions
 736          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 737          *   to the $audience parameter
 738          * @return User|null
 739          */
 740         public function getCreator( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 741                 $revision = $this->getOldestRevision();
 742                 if ( $revision ) {
 743                         $userName = $revision->getUserText( $audience, $user );
 744                         return User::newFromName( $userName, false );
 745                 } else {
 746                         return null;
 747                 }
 748         }
 749
 750         /**
 751          * @param int $audience One of:
 752          *   Revision::FOR_PUBLIC       to be displayed to all users
 753          *   Revision::FOR_THIS_USER    to be displayed to the given user
 754          *   Revision::RAW              get the text regardless of permissions
 755          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 756          *   to the $audience parameter
 757          * @return string Username of the user that made the last article revision
 758          */
 759         public function getUserText( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 760                 $this->loadLastEdit();
 761                 if ( $this->mLastRevision ) {
 762                         return $this->mLastRevision->getUserText( $audience, $user );
 763                 } else {
 764                         return '';
 765                 }
 766         }
 767
 768         /**
 769          * @param int $audience One of:
 770          *   Revision::FOR_PUBLIC       to be displayed to all users
 771          *   Revision::FOR_THIS_USER    to be displayed to the given user
 772          *   Revision::RAW              get the text regardless of permissions
 773          * @param User $user User object to check for, only if FOR_THIS_USER is passed
 774          *   to the $audience parameter
 775          * @return string Comment stored for the last article revision
 776          */
 777         public function getComment( $audience = Revision::FOR_PUBLIC, User $user = null ) {
 778                 $this->loadLastEdit();
 779                 if ( $this->mLastRevision ) {
 780                         return $this->mLastRevision->getComment( $audience, $user );
 781                 } else {
 782                         return '';
 783                 }
 784         }
 785
 786         /**
 787          * Returns true if last revision was marked as "minor edit"
 788          *
 789          * @return bool Minor edit indicator for the last article revision.
 790          */
 791         public function getMinorEdit() {
 792                 $this->loadLastEdit();
 793                 if ( $this->mLastRevision ) {
 794                         return $this->mLastRevision->isMinor();
 795                 } else {
 796                         return false;
 797                 }
 798         }
 799
 800         /**
 801          * Determine whether a page would be suitable for being counted as an
 802          * article in the site_stats table based on the title & its content
 803          *
 804          * @param object|bool $editInfo (false): object returned by prepareTextForEdit(),
 805          *   if false, the current database state will be used
 806          * @return bool
 807          */
 808         public function isCountable( $editInfo = false ) {
 809                 global $wgArticleCountMethod;
 810
 811                 if ( !$this->mTitle->isContentPage() ) {
 812                         return false;
 813                 }
 814
 815                 if ( $editInfo ) {
 816                         $content = $editInfo->pstContent;
 817                 } else {
 818                         $content = $this->getContent();
 819                 }
 820
 821                 if ( !$content || $content->isRedirect() ) {
 822                         return false;
 823                 }
 824
 825                 $hasLinks = null;
 826
 827                 if ( $wgArticleCountMethod === 'link' ) {
 828                         // nasty special case to avoid re-parsing to detect links
 829
 830                         if ( $editInfo ) {
 831                                 // ParserOutput::getLinks() is a 2D array of page links, so
 832                                 // to be really correct we would need to recurse in the array
 833                                 // but the main array should only have items in it if there are
 834                                 // links.
 835                                 $hasLinks = (bool)count( $editInfo->output->getLinks() );
 836                         } else {
 837                                 $hasLinks = (bool)wfGetDB( DB_REPLICA )->selectField( 'pagelinks', 1,
 838                                         [ 'pl_from' => $this->getId() ], __METHOD__ );
 839                         }
 840                 }
 841
 842                 return $content->isCountable( $hasLinks );
 843         }
 844
 845         /**
 846          * If this page is a redirect, get its target
 847          *
 848          * The target will be fetched from the redirect table if possible.
 849          * If this page doesn't have an entry there, call insertRedirect()
 850          * @return Title|null Title object, or null if this page is not a redirect
 851          */
 852         public function getRedirectTarget() {
 853                 if ( !$this->mTitle->isRedirect() ) {
 854                         return null;
 855                 }
 856
 857                 if ( $this->mRedirectTarget !== null ) {
 858                         return $this->mRedirectTarget;
 859                 }
 860
 861                 // Query the redirect table
 862                 $dbr = wfGetDB( DB_REPLICA );
 863                 $row = $dbr->selectRow( 'redirect',
 864                         [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ],
 865                         [ 'rd_from' => $this->getId() ],
 866                         __METHOD__
 867                 );
 868
 869                 // rd_fragment and rd_interwiki were added later, populate them if empty
 870                 if ( $row && !is_null( $row->rd_fragment ) && !is_null( $row->rd_interwiki ) ) {
 871                         $this->mRedirectTarget = Title::makeTitle(
 872                                 $row->rd_namespace, $row->rd_title,
 873                                 $row->rd_fragment, $row->rd_interwiki
 874                         );
 875                         return $this->mRedirectTarget;
 876                 }
 877
 878                 // This page doesn't have an entry in the redirect table
 879                 $this->mRedirectTarget = $this->insertRedirect();
 880                 return $this->mRedirectTarget;
 881         }
 882
 883         /**
 884          * Insert an entry for this page into the redirect table if the content is a redirect
 885          *
 886          * The database update will be deferred via DeferredUpdates
 887          *
 888          * Don't call this function directly unless you know what you're doing.
 889          * @return Title|null Title object or null if not a redirect
 890          */
 891         public function insertRedirect() {
 892                 $content = $this->getContent();
 893                 $retval = $content ? $content->getUltimateRedirectTarget() : null;
 894                 if ( !$retval ) {
 895                         return null;
 896                 }
 897
 898                 // Update the DB post-send if the page has not cached since now
 899                 $that = $this;
 900                 $latest = $this->getLatest();
 901                 DeferredUpdates::addCallableUpdate(
 902                         function () use ( $that, $retval, $latest ) {
 903                                 $that->insertRedirectEntry( $retval, $latest );
 904                         },
 905                         DeferredUpdates::POSTSEND,
 906                         wfGetDB( DB_MASTER )
 907                 );
 908
 909                 return $retval;
 910         }
 911
 912         /**
 913          * Insert or update the redirect table entry for this page to indicate it redirects to $rt
 914          * @param Title $rt Redirect target
 915          * @param int|null $oldLatest Prior page_latest for check and set
 916          */
 917         public function insertRedirectEntry( Title $rt, $oldLatest = null ) {
 918                 $dbw = wfGetDB( DB_MASTER );
 919                 $dbw->startAtomic( __METHOD__ );
 920
 921                 if ( !$oldLatest || $oldLatest == $this->lockAndGetLatest() ) {
 922                         $dbw->upsert(
 923                                 'redirect',
 924                                 [
 925                                         'rd_from' => $this->getId(),
 926                                         'rd_namespace' => $rt->getNamespace(),
 927                                         'rd_title' => $rt->getDBkey(),
 928                                         'rd_fragment' => $rt->getFragment(),
 929                                         'rd_interwiki' => $rt->getInterwiki(),
 930                                 ],
 931                                 [ 'rd_from' ],
 932                                 [
 933                                         'rd_namespace' => $rt->getNamespace(),
 934                                         'rd_title' => $rt->getDBkey(),
 935                                         'rd_fragment' => $rt->getFragment(),
 936                                         'rd_interwiki' => $rt->getInterwiki(),
 937                                 ],
 938                                 __METHOD__
 939                         );
 940                 }
 941
 942                 $dbw->endAtomic( __METHOD__ );
 943         }
 944
 945         /**
 946          * Get the Title object or URL this page redirects to
 947          *
 948          * @return bool|Title|string False, Title of in-wiki target, or string with URL
 949          */
 950         public function followRedirect() {
 951                 return $this->getRedirectURL( $this->getRedirectTarget() );
 952         }
 953
 954         /**
 955          * Get the Title object or URL to use for a redirect. We use Title
 956          * objects for same-wiki, non-special redirects and URLs for everything
 957          * else.
 958          * @param Title $rt Redirect target
 959          * @return bool|Title|string False, Title object of local target, or string with URL
 960          */
 961         public function getRedirectURL( $rt ) {
 962                 if ( !$rt ) {
 963                         return false;
 964                 }
 965
 966                 if ( $rt->isExternal() ) {
 967                         if ( $rt->isLocal() ) {
 968                                 // Offsite wikis need an HTTP redirect.
 969                                 // This can be hard to reverse and may produce loops,
 970                                 // so they may be disabled in the site configuration.
 971                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 972                                 return $rt->getFullURL( [ 'rdfrom' => $source ] );
 973                         } else {
 974                                 // External pages without "local" bit set are not valid
 975                                 // redirect targets
 976                                 return false;
 977                         }
 978                 }
 979
 980                 if ( $rt->isSpecialPage() ) {
 981                         // Gotta handle redirects to special pages differently:
 982                         // Fill the HTTP response "Location" header and ignore the rest of the page we're on.
 983                         // Some pages are not valid targets.
 984                         if ( $rt->isValidRedirectTarget() ) {
 985                                 return $rt->getFullURL();
 986                         } else {
 987                                 return false;
 988                         }
 989                 }
 990
 991                 return $rt;
 992         }
 993
 994         /**
 995          * Get a list of users who have edited this article, not including the user who made
 996          * the most recent revision, which you can get from $article->getUser() if you want it
 997          * @return UserArrayFromResult
 998          */
 999         public function getContributors() {
1000                 // @todo FIXME: This is expensive; cache this info somewhere.
1001
1002                 $dbr = wfGetDB( DB_REPLICA );
1003
1004                 if ( $dbr->implicitGroupby() ) {
1005                         $realNameField = 'user_real_name';
1006                 } else {
1007                         $realNameField = 'MIN(user_real_name) AS user_real_name';
1008                 }
1009
1010                 $tables = [ 'revision', 'user' ];
1011
1012                 $fields = [
1013                         'user_id' => 'rev_user',
1014                         'user_name' => 'rev_user_text',
1015                         $realNameField,
1016                         'timestamp' => 'MAX(rev_timestamp)',
1017                 ];
1018
1019                 $conds = [ 'rev_page' => $this->getId() ];
1020
1021                 // The user who made the top revision gets credited as "this page was last edited by
1022                 // John, based on contributions by Tom, Dick and Harry", so don't include them twice.
1023                 $user = $this->getUser();
1024                 if ( $user ) {
1025                         $conds[] = "rev_user != $user";
1026                 } else {
1027                         $conds[] = "rev_user_text != {$dbr->addQuotes( $this->getUserText() )}";
1028                 }
1029
1030                 // Username hidden?
1031                 $conds[] = "{$dbr->bitAnd( 'rev_deleted', Revision::DELETED_USER )} = 0";
1032
1033                 $jconds = [
1034                         'user' => [ 'LEFT JOIN', 'rev_user = user_id' ],
1035                 ];
1036
1037                 $options = [
1038                         'GROUP BY' => [ 'rev_user', 'rev_user_text' ],
1039                         'ORDER BY' => 'timestamp DESC',
1040                 ];
1041
1042                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $options, $jconds );
1043                 return new UserArrayFromResult( $res );
1044         }
1045
1046         /**
1047          * Should the parser cache be used?
1048          *
1049          * @param ParserOptions $parserOptions ParserOptions to check
1050          * @param int $oldId
1051          * @return bool
1052          */
1053         public function shouldCheckParserCache( ParserOptions $parserOptions, $oldId ) {
1054                 return $parserOptions->getStubThreshold() == 0
1055                         && $this->exists()
1056                         && ( $oldId === null || $oldId === 0 || $oldId === $this->getLatest() )
1057                         && $this->getContentHandler()->isParserCacheSupported();
1058         }
1059
1060         /**
1061          * Get a ParserOutput for the given ParserOptions and revision ID.
1062          *
1063          * The parser cache will be used if possible. Cache misses that result
1064          * in parser runs are debounced with PoolCounter.
1065          *
1066          * @since 1.19
1067          * @param ParserOptions $parserOptions ParserOptions to use for the parse operation
1068          * @param null|int      $oldid Revision ID to get the text from, passing null or 0 will
1069          *                             get the current revision (default value)
1070          * @param bool          $forceParse Force reindexing, regardless of cache settings
1071          * @return bool|ParserOutput ParserOutput or false if the revision was not found
1072          */
1073         public function getParserOutput(
1074                 ParserOptions $parserOptions, $oldid = null, $forceParse = false
1075         ) {
1076                 $useParserCache =
1077                         ( !$forceParse ) && $this->shouldCheckParserCache( $parserOptions, $oldid );
1078                 wfDebug( __METHOD__ .
1079                         ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1080                 if ( $parserOptions->getStubThreshold() ) {
1081                         wfIncrStats( 'pcache.miss.stub' );
1082                 }
1083
1084                 if ( $useParserCache ) {
1085                         $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
1086                         if ( $parserOutput !== false ) {
1087                                 return $parserOutput;
1088                         }
1089                 }
1090
1091                 if ( $oldid === null || $oldid === 0 ) {
1092                         $oldid = $this->getLatest();
1093                 }
1094
1095                 $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
1096                 $pool->execute();
1097
1098                 return $pool->getParserOutput();
1099         }
1100
1101         /**
1102          * Do standard deferred updates after page view (existing or missing page)
1103          * @param User $user The relevant user
1104          * @param int $oldid Revision id being viewed; if not given or 0, latest revision is assumed
1105          */
1106         public function doViewUpdates( User $user, $oldid = 0 ) {
1107                 if ( wfReadOnly() ) {
1108                         return;
1109                 }
1110
1111                 Hooks::run( 'PageViewUpdates', [ $this, $user ] );
1112                 // Update newtalk / watchlist notification status
1113                 try {
1114                         $user->clearNotification( $this->mTitle, $oldid );
1115                 } catch ( DBError $e ) {
1116                         // Avoid outage if the master is not reachable
1117                         MWExceptionHandler::logException( $e );
1118                 }
1119         }
1120
1121         /**
1122          * Perform the actions of a page purging
1123          * @param integer $flags Bitfield of WikiPage::PURGE_* constants
1124          * @return bool
1125          */
1126         public function doPurge( $flags = self::PURGE_ALL ) {
1127                 // Avoid PHP 7.1 warning of passing $this by reference
1128                 $wikiPage = $this;
1129
1130                 if ( !Hooks::run( 'ArticlePurge', [ &$wikiPage ] ) ) {
1131                         return false;
1132                 }
1133
1134                 if ( ( $flags & self::PURGE_GLOBAL_PCACHE ) == self::PURGE_GLOBAL_PCACHE ) {
1135                         // Set page_touched in the database to invalidate all DC caches
1136                         $this->mTitle->invalidateCache();
1137                 } elseif ( ( $flags & self::PURGE_CLUSTER_PCACHE ) == self::PURGE_CLUSTER_PCACHE ) {
1138                         // Delete the parser options key in the local cluster to invalidate the DC cache
1139                         ParserCache::singleton()->deleteOptionsKey( $this );
1140                         // Avoid sending HTTP 304s in ViewAction to the client who just issued the purge
1141                         $cache = ObjectCache::getLocalClusterInstance();
1142                         $cache->set(
1143                                 $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ),
1144                                 wfTimestamp( TS_MW ),
1145                                 $cache::TTL_HOUR
1146                         );
1147                 }
1148
1149                 if ( ( $flags & self::PURGE_CDN_CACHE ) == self::PURGE_CDN_CACHE ) {
1150                         // Clear any HTML file cache
1151                         HTMLFileCache::clearFileCache( $this->getTitle() );
1152                         // Send purge after any page_touched above update was committed
1153                         DeferredUpdates::addUpdate(
1154                                 new CdnCacheUpdate( $this->mTitle->getCdnUrls() ),
1155                                 DeferredUpdates::PRESEND
1156                         );
1157                 }
1158
1159                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
1160                         $messageCache = MessageCache::singleton();
1161                         $messageCache->updateMessageOverride( $this->mTitle, $this->getContent() );
1162                 }
1163
1164                 return true;
1165         }
1166
1167         /**
1168          * Get the last time a user explicitly purged the page via action=purge
1169          *
1170          * @return string|bool TS_MW timestamp or false
1171          * @since 1.28
1172          */
1173         public function getLastPurgeTimestamp() {
1174                 $cache = ObjectCache::getLocalClusterInstance();
1175
1176                 return $cache->get( $cache->makeKey( 'page', 'last-dc-purge', $this->getId() ) );
1177         }
1178
1179         /**
1180          * Insert a new empty page record for this article.
1181          * This *must* be followed up by creating a revision
1182          * and running $this->updateRevisionOn( ... );
1183          * or else the record will be left in a funky state.
1184          * Best if all done inside a transaction.
1185          *
1186          * @param IDatabase $dbw
1187          * @param int|null $pageId Custom page ID that will be used for the insert statement
1188          *
1189          * @return bool|int The newly created page_id key; false if the row was not
1190          *   inserted, e.g. because the title already existed or because the specified
1191          *   page ID is already in use.
1192          */
1193         public function insertOn( $dbw, $pageId = null ) {
1194                 $pageIdForInsert = $pageId ?: $dbw->nextSequenceValue( 'page_page_id_seq' );
1195                 $dbw->insert(
1196                         'page',
1197                         [
1198                                 'page_id'           => $pageIdForInsert,
1199                                 'page_namespace'    => $this->mTitle->getNamespace(),
1200                                 'page_title'        => $this->mTitle->getDBkey(),
1201                                 'page_restrictions' => '',
1202                                 'page_is_redirect'  => 0, // Will set this shortly...
1203                                 'page_is_new'       => 1,
1204                                 'page_random'       => wfRandom(),
1205                                 'page_touched'      => $dbw->timestamp(),
1206                                 'page_latest'       => 0, // Fill this in shortly...
1207                                 'page_len'          => 0, // Fill this in shortly...
1208                         ],
1209                         __METHOD__,
1210                         'IGNORE'
1211                 );
1212
1213                 if ( $dbw->affectedRows() > 0 ) {
1214                         $newid = $pageId ?: $dbw->insertId();
1215                         $this->mId = $newid;
1216                         $this->mTitle->resetArticleID( $newid );
1217
1218                         return $newid;
1219                 } else {
1220                         return false; // nothing changed
1221                 }
1222         }
1223
1224         /**
1225          * Update the page record to point to a newly saved revision.
1226          *
1227          * @param IDatabase $dbw
1228          * @param Revision $revision For ID number, and text used to set
1229          *   length and redirect status fields
1230          * @param int $lastRevision If given, will not overwrite the page field
1231          *   when different from the currently set value.
1232          *   Giving 0 indicates the new page flag should be set on.
1233          * @param bool $lastRevIsRedirect If given, will optimize adding and
1234          *   removing rows in redirect table.
1235          * @return bool Success; false if the page row was missing or page_latest changed
1236          */
1237         public function updateRevisionOn( $dbw, $revision, $lastRevision = null,
1238                 $lastRevIsRedirect = null
1239         ) {
1240                 global $wgContentHandlerUseDB;
1241
1242                 // Assertion to try to catch T92046
1243                 if ( (int)$revision->getId() === 0 ) {
1244                         throw new InvalidArgumentException(
1245                                 __METHOD__ . ': Revision has ID ' . var_export( $revision->getId(), 1 )
1246                         );
1247                 }
1248
1249                 $content = $revision->getContent();
1250                 $len = $content ? $content->getSize() : 0;
1251                 $rt = $content ? $content->getUltimateRedirectTarget() : null;
1252
1253                 $conditions = [ 'page_id' => $this->getId() ];
1254
1255                 if ( !is_null( $lastRevision ) ) {
1256                         // An extra check against threads stepping on each other
1257                         $conditions['page_latest'] = $lastRevision;
1258                 }
1259
1260                 $row = [ /* SET */
1261                         'page_latest'      => $revision->getId(),
1262                         'page_touched'     => $dbw->timestamp( $revision->getTimestamp() ),
1263                         'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
1264                         'page_is_redirect' => $rt !== null ? 1 : 0,
1265                         'page_len'         => $len,
1266                 ];
1267
1268                 if ( $wgContentHandlerUseDB ) {
1269                         $row['page_content_model'] = $revision->getContentModel();
1270                 }
1271
1272                 $dbw->update( 'page',
1273                         $row,
1274                         $conditions,
1275                         __METHOD__ );
1276
1277                 $result = $dbw->affectedRows() > 0;
1278                 if ( $result ) {
1279                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1280                         $this->setLastEdit( $revision );
1281                         $this->mLatest = $revision->getId();
1282                         $this->mIsRedirect = (bool)$rt;
1283                         // Update the LinkCache.
1284                         LinkCache::singleton()->addGoodLinkObj(
1285                                 $this->getId(),
1286                                 $this->mTitle,
1287                                 $len,
1288                                 $this->mIsRedirect,
1289                                 $this->mLatest,
1290                                 $revision->getContentModel()
1291                         );
1292                 }
1293
1294                 return $result;
1295         }
1296
1297         /**
1298          * Add row to the redirect table if this is a redirect, remove otherwise.
1299          *
1300          * @param IDatabase $dbw
1301          * @param Title $redirectTitle Title object pointing to the redirect target,
1302          *   or NULL if this is not a redirect
1303          * @param null|bool $lastRevIsRedirect If given, will optimize adding and
1304          *   removing rows in redirect table.
1305          * @return bool True on success, false on failure
1306          * @private
1307          */
1308         public function updateRedirectOn( $dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1309                 // Always update redirects (target link might have changed)
1310                 // Update/Insert if we don't know if the last revision was a redirect or not
1311                 // Delete if changing from redirect to non-redirect
1312                 $isRedirect = !is_null( $redirectTitle );
1313
1314                 if ( !$isRedirect && $lastRevIsRedirect === false ) {
1315                         return true;
1316                 }
1317
1318                 if ( $isRedirect ) {
1319                         $this->insertRedirectEntry( $redirectTitle );
1320                 } else {
1321                         // This is not a redirect, remove row from redirect table
1322                         $where = [ 'rd_from' => $this->getId() ];
1323                         $dbw->delete( 'redirect', $where, __METHOD__ );
1324                 }
1325
1326                 if ( $this->getTitle()->getNamespace() == NS_FILE ) {
1327                         RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $this->getTitle() );
1328                 }
1329
1330                 return ( $dbw->affectedRows() != 0 );
1331         }
1332
1333         /**
1334          * If the given revision is newer than the currently set page_latest,
1335          * update the page record. Otherwise, do nothing.
1336          *
1337          * @deprecated since 1.24, use updateRevisionOn instead
1338          *
1339          * @param IDatabase $dbw
1340          * @param Revision $revision
1341          * @return bool
1342          */
1343         public function updateIfNewerOn( $dbw, $revision ) {
1344
1345                 $row = $dbw->selectRow(
1346                         [ 'revision', 'page' ],
1347                         [ 'rev_id', 'rev_timestamp', 'page_is_redirect' ],
1348                         [
1349                                 'page_id' => $this->getId(),
1350                                 'page_latest=rev_id' ],
1351                         __METHOD__ );
1352
1353                 if ( $row ) {
1354                         if ( wfTimestamp( TS_MW, $row->rev_timestamp ) >= $revision->getTimestamp() ) {
1355                                 return false;
1356                         }
1357                         $prev = $row->rev_id;
1358                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1359                 } else {
1360                         // No or missing previous revision; mark the page as new
1361                         $prev = 0;
1362                         $lastRevIsRedirect = null;
1363                 }
1364
1365                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1366
1367                 return $ret;
1368         }
1369
1370         /**
1371          * Get the content that needs to be saved in order to undo all revisions
1372          * between $undo and $undoafter. Revisions must belong to the same page,
1373          * must exist and must not be deleted
1374          * @param Revision $undo
1375          * @param Revision $undoafter Must be an earlier revision than $undo
1376          * @return Content|bool Content on success, false on failure
1377          * @since 1.21
1378          * Before we had the Content object, this was done in getUndoText
1379          */
1380         public function getUndoContent( Revision $undo, Revision $undoafter = null ) {
1381                 $handler = $undo->getContentHandler();
1382                 return $handler->getUndoContent( $this->getRevision(), $undo, $undoafter );
1383         }
1384
1385         /**
1386          * Returns true if this page's content model supports sections.
1387          *
1388          * @return bool
1389          *
1390          * @todo The skin should check this and not offer section functionality if
1391          *   sections are not supported.
1392          * @todo The EditPage should check this and not offer section functionality
1393          *   if sections are not supported.
1394          */
1395         public function supportsSections() {
1396                 return $this->getContentHandler()->supportsSections();
1397         }
1398
1399         /**
1400          * @param string|int|null|bool $sectionId Section identifier as a number or string
1401          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1402          * or 'new' for a new section.
1403          * @param Content $sectionContent New content of the section.
1404          * @param string $sectionTitle New section's subject, only if $section is "new".
1405          * @param string $edittime Revision timestamp or null to use the current revision.
1406          *
1407          * @throws MWException
1408          * @return Content|null New complete article content, or null if error.
1409          *
1410          * @since 1.21
1411          * @deprecated since 1.24, use replaceSectionAtRev instead
1412          */
1413         public function replaceSectionContent(
1414                 $sectionId, Content $sectionContent, $sectionTitle = '', $edittime = null
1415         ) {
1416
1417                 $baseRevId = null;
1418                 if ( $edittime && $sectionId !== 'new' ) {
1419                         $dbr = wfGetDB( DB_REPLICA );
1420                         $rev = Revision::loadFromTimestamp( $dbr, $this->mTitle, $edittime );
1421                         // Try the master if this thread may have just added it.
1422                         // This could be abstracted into a Revision method, but we don't want
1423                         // to encourage loading of revisions by timestamp.
1424                         if ( !$rev
1425                                 && wfGetLB()->getServerCount() > 1
1426                                 && wfGetLB()->hasOrMadeRecentMasterChanges()
1427                         ) {
1428                                 $dbw = wfGetDB( DB_MASTER );
1429                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1430                         }
1431                         if ( $rev ) {
1432                                 $baseRevId = $rev->getId();
1433                         }
1434                 }
1435
1436                 return $this->replaceSectionAtRev( $sectionId, $sectionContent, $sectionTitle, $baseRevId );
1437         }
1438
1439         /**
1440          * @param string|int|null|bool $sectionId Section identifier as a number or string
1441          * (e.g. 0, 1 or 'T-1'), null/false or an empty string for the whole page
1442          * or 'new' for a new section.
1443          * @param Content $sectionContent New content of the section.
1444          * @param string $sectionTitle New section's subject, only if $section is "new".
1445          * @param int|null $baseRevId
1446          *
1447          * @throws MWException
1448          * @return Content|null New complete article content, or null if error.
1449          *
1450          * @since 1.24
1451          */
1452         public function replaceSectionAtRev( $sectionId, Content $sectionContent,
1453                 $sectionTitle = '', $baseRevId = null
1454         ) {
1455
1456                 if ( strval( $sectionId ) === '' ) {
1457                         // Whole-page edit; let the whole text through
1458                         $newContent = $sectionContent;
1459                 } else {
1460                         if ( !$this->supportsSections() ) {
1461                                 throw new MWException( "sections not supported for content model " .
1462                                         $this->getContentHandler()->getModelID() );
1463                         }
1464
1465                         // T32711: always use current version when adding a new section
1466                         if ( is_null( $baseRevId ) || $sectionId === 'new' ) {
1467                                 $oldContent = $this->getContent();
1468                         } else {
1469                                 $rev = Revision::newFromId( $baseRevId );
1470                                 if ( !$rev ) {
1471                                         wfDebug( __METHOD__ . " asked for bogus section (page: " .
1472                                                 $this->getId() . "; section: $sectionId)\n" );
1473                                         return null;
1474                                 }
1475
1476                                 $oldContent = $rev->getContent();
1477                         }
1478
1479                         if ( !$oldContent ) {
1480                                 wfDebug( __METHOD__ . ": no page text\n" );
1481                                 return null;
1482                         }
1483
1484                         $newContent = $oldContent->replaceSection( $sectionId, $sectionContent, $sectionTitle );
1485                 }
1486
1487                 return $newContent;
1488         }
1489
1490         /**
1491          * Check flags and add EDIT_NEW or EDIT_UPDATE to them as needed.
1492          * @param int $flags
1493          * @return int Updated $flags
1494          */
1495         public function checkFlags( $flags ) {
1496                 if ( !( $flags & EDIT_NEW ) && !( $flags & EDIT_UPDATE ) ) {
1497                         if ( $this->exists() ) {
1498                                 $flags |= EDIT_UPDATE;
1499                         } else {
1500                                 $flags |= EDIT_NEW;
1501                         }
1502                 }
1503
1504                 return $flags;
1505         }
1506
1507         /**
1508          * Change an existing article or create a new article. Updates RC and all necessary caches,
1509          * optionally via the deferred update array.
1510          *
1511          * @param Content $content New content
1512          * @param string $summary Edit summary
1513          * @param int $flags Bitfield:
1514          *      EDIT_NEW
1515          *          Article is known or assumed to be non-existent, create a new one
1516          *      EDIT_UPDATE
1517          *          Article is known or assumed to be pre-existing, update it
1518          *      EDIT_MINOR
1519          *          Mark this edit minor, if the user is allowed to do so
1520          *      EDIT_SUPPRESS_RC
1521          *          Do not log the change in recentchanges
1522          *      EDIT_FORCE_BOT
1523          *          Mark the edit a "bot" edit regardless of user rights
1524          *      EDIT_AUTOSUMMARY
1525          *          Fill in blank summaries with generated text where possible
1526          *      EDIT_INTERNAL
1527          *          Signal that the page retrieve/save cycle happened entirely in this request.
1528          *
1529          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the
1530          * article will be detected. If EDIT_UPDATE is specified and the article
1531          * doesn't exist, the function will return an edit-gone-missing error. If
1532          * EDIT_NEW is specified and the article does exist, an edit-already-exists
1533          * error will be returned. These two conditions are also possible with
1534          * auto-detection due to MediaWiki's performance-optimised locking strategy.
1535          *
1536          * @param bool|int $baseRevId The revision ID this edit was based off, if any.
1537          *   This is not the parent revision ID, rather the revision ID for older
1538          *   content used as the source for a rollback, for example.
1539          * @param User $user The user doing the edit
1540          * @param string $serialFormat Format for storing the content in the
1541          *   database.
1542          * @param array|null $tags Change tags to apply to this edit
1543          * Callers are responsible for permission checks
1544          * (with ChangeTags::canAddTagsAccompanyingChange)
1545          * @param Int $undidRevId Id of revision that was undone or 0
1546          *
1547          * @throws MWException
1548          * @return Status Possible errors:
1549          *     edit-hook-aborted: The ArticleSave hook aborted the edit but didn't
1550          *       set the fatal flag of $status.
1551          *     edit-gone-missing: In update mode, but the article didn't exist.
1552          *     edit-conflict: In update mode, the article changed unexpectedly.
1553          *     edit-no-change: Warning that the text was the same as before.
1554          *     edit-already-exists: In creation mode, but the article already exists.
1555          *
1556          *  Extensions may define additional errors.
1557          *
1558          *  $return->value will contain an associative array with members as follows:
1559          *     new: Boolean indicating if the function attempted to create a new article.
1560          *     revision: The revision object for the inserted revision, or null.
1561          *
1562          * @since 1.21
1563          * @throws MWException
1564          */
1565         public function doEditContent(
1566                 Content $content, $summary, $flags = 0, $baseRevId = false,
1567                 User $user = null, $serialFormat = null, $tags = [], $undidRevId = 0
1568         ) {
1569                 global $wgUser, $wgUseAutomaticEditSummaries;
1570
1571                 // Old default parameter for $tags was null
1572                 if ( $tags === null ) {
1573                         $tags = [];
1574                 }
1575
1576                 // Low-level sanity check
1577                 if ( $this->mTitle->getText() === '' ) {
1578                         throw new MWException( 'Something is trying to edit an article with an empty title' );
1579                 }
1580                 // Make sure the given content type is allowed for this page
1581                 if ( !$content->getContentHandler()->canBeUsedOn( $this->mTitle ) ) {
1582                         return Status::newFatal( 'content-not-allowed-here',
1583                                 ContentHandler::getLocalizedName( $content->getModel() ),
1584                                 $this->mTitle->getPrefixedText()
1585                         );
1586                 }
1587
1588                 // Load the data from the master database if needed.
1589                 // The caller may already loaded it from the master or even loaded it using
1590                 // SELECT FOR UPDATE, so do not override that using clear().
1591                 $this->loadPageData( 'fromdbmaster' );
1592
1593                 $user = $user ?: $wgUser;
1594                 $flags = $this->checkFlags( $flags );
1595
1596                 // Avoid PHP 7.1 warning of passing $this by reference
1597                 $wikiPage = $this;
1598
1599                 // Trigger pre-save hook (using provided edit summary)
1600                 $hookStatus = Status::newGood( [] );
1601                 $hook_args = [ &$wikiPage, &$user, &$content, &$summary,
1602                                                         $flags & EDIT_MINOR, null, null, &$flags, &$hookStatus ];
1603                 // Check if the hook rejected the attempted save
1604                 if ( !Hooks::run( 'PageContentSave', $hook_args ) ) {
1605                         if ( $hookStatus->isOK() ) {
1606                                 // Hook returned false but didn't call fatal(); use generic message
1607                                 $hookStatus->fatal( 'edit-hook-aborted' );
1608                         }
1609
1610                         return $hookStatus;
1611                 }
1612
1613                 $old_revision = $this->getRevision(); // current revision
1614                 $old_content = $this->getContent( Revision::RAW ); // current revision's content
1615
1616                 if ( $old_content && $old_content->getModel() !== $content->getModel() ) {
1617                         $tags[] = 'mw-contentmodelchange';
1618                 }
1619
1620                 // Provide autosummaries if one is not provided and autosummaries are enabled
1621                 if ( $wgUseAutomaticEditSummaries && ( $flags & EDIT_AUTOSUMMARY ) && $summary == '' ) {
1622                         $handler = $content->getContentHandler();
1623                         $summary = $handler->getAutosummary( $old_content, $content, $flags );
1624                 }
1625
1626                 // Avoid statsd noise and wasted cycles check the edit stash (T136678)
1627                 if ( ( $flags & EDIT_INTERNAL ) || ( $flags & EDIT_FORCE_BOT ) ) {
1628                         $useCache = false;
1629                 } else {
1630                         $useCache = true;
1631                 }
1632
1633                 // Get the pre-save transform content and final parser output
1634                 $editInfo = $this->prepareContentForEdit( $content, null, $user, $serialFormat, $useCache );
1635                 $pstContent = $editInfo->pstContent; // Content object
1636                 $meta = [
1637                         'bot' => ( $flags & EDIT_FORCE_BOT ),
1638                         'minor' => ( $flags & EDIT_MINOR ) && $user->isAllowed( 'minoredit' ),
1639                         'serialized' => $editInfo->pst,
1640                         'serialFormat' => $serialFormat,
1641                         'baseRevId' => $baseRevId,
1642                         'oldRevision' => $old_revision,
1643                         'oldContent' => $old_content,
1644                         'oldId' => $this->getLatest(),
1645                         'oldIsRedirect' => $this->isRedirect(),
1646                         'oldCountable' => $this->isCountable(),
1647                         'tags' => ( $tags !== null ) ? (array)$tags : [],
1648                         'undidRevId' => $undidRevId
1649                 ];
1650
1651                 // Actually create the revision and create/update the page
1652                 if ( $flags & EDIT_UPDATE ) {
1653                         $status = $this->doModify( $pstContent, $flags, $user, $summary, $meta );
1654                 } else {
1655                         $status = $this->doCreate( $pstContent, $flags, $user, $summary, $meta );
1656                 }
1657
1658                 // Promote user to any groups they meet the criteria for
1659                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
1660                         $user->addAutopromoteOnceGroups( 'onEdit' );
1661                         $user->addAutopromoteOnceGroups( 'onView' ); // b/c
1662                 } );
1663
1664                 return $status;
1665         }
1666
1667         /**
1668          * @param Content $content Pre-save transform content
1669          * @param integer $flags
1670          * @param User $user
1671          * @param string $summary
1672          * @param array $meta
1673          * @return Status
1674          * @throws DBUnexpectedError
1675          * @throws Exception
1676          * @throws FatalError
1677          * @throws MWException
1678          */
1679         private function doModify(
1680                 Content $content, $flags, User $user, $summary, array $meta
1681         ) {
1682                 global $wgUseRCPatrol;
1683
1684                 // Update article, but only if changed.
1685                 $status = Status::newGood( [ 'new' => false, 'revision' => null ] );
1686
1687                 // Convenience variables
1688                 $now = wfTimestampNow();
1689                 $oldid = $meta['oldId'];
1690                 /** @var $oldContent Content|null */
1691                 $oldContent = $meta['oldContent'];
1692                 $newsize = $content->getSize();
1693
1694                 if ( !$oldid ) {
1695                         // Article gone missing
1696                         $status->fatal( 'edit-gone-missing' );
1697
1698                         return $status;
1699                 } elseif ( !$oldContent ) {
1700                         // Sanity check for T39225
1701                         throw new MWException( "Could not find text for current revision {$oldid}." );
1702                 }
1703
1704                 // @TODO: pass content object?!
1705                 $revision = new Revision( [
1706                         'page'       => $this->getId(),
1707                         'title'      => $this->mTitle, // for determining the default content model
1708                         'comment'    => $summary,
1709                         'minor_edit' => $meta['minor'],
1710                         'text'       => $meta['serialized'],
1711                         'len'        => $newsize,
1712                         'parent_id'  => $oldid,
1713                         'user'       => $user->getId(),
1714                         'user_text'  => $user->getName(),
1715                         'timestamp'  => $now,
1716                         'content_model' => $content->getModel(),
1717                         'content_format' => $meta['serialFormat'],
1718                 ] );
1719
1720                 $changed = !$content->equals( $oldContent );
1721
1722                 $dbw = wfGetDB( DB_MASTER );
1723
1724                 if ( $changed ) {
1725                         $prepStatus = $content->prepareSave( $this, $flags, $oldid, $user );
1726                         $status->merge( $prepStatus );
1727                         if ( !$status->isOK() ) {
1728                                 return $status;
1729                         }
1730
1731                         $dbw->startAtomic( __METHOD__ );
1732                         // Get the latest page_latest value while locking it.
1733                         // Do a CAS style check to see if it's the same as when this method
1734                         // started. If it changed then bail out before touching the DB.
1735                         $latestNow = $this->lockAndGetLatest();
1736                         if ( $latestNow != $oldid ) {
1737                                 $dbw->endAtomic( __METHOD__ );
1738                                 // Page updated or deleted in the mean time
1739                                 $status->fatal( 'edit-conflict' );
1740
1741                                 return $status;
1742                         }
1743
1744                         // At this point we are now comitted to returning an OK
1745                         // status unless some DB query error or other exception comes up.
1746                         // This way callers don't have to call rollback() if $status is bad
1747                         // unless they actually try to catch exceptions (which is rare).
1748
1749                         // Save the revision text
1750                         $revisionId = $revision->insertOn( $dbw );
1751                         // Update page_latest and friends to reflect the new revision
1752                         if ( !$this->updateRevisionOn( $dbw, $revision, null, $meta['oldIsRedirect'] ) ) {
1753                                 throw new MWException( "Failed to update page row to use new revision." );
1754                         }
1755
1756                         Hooks::run( 'NewRevisionFromEditComplete',
1757                                 [ $this, $revision, $meta['baseRevId'], $user ] );
1758
1759                         // Update recentchanges
1760                         if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1761                                 // Mark as patrolled if the user can do so
1762                                 $patrolled = $wgUseRCPatrol && !count(
1763                                                 $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1764                                 // Add RC row to the DB
1765                                 RecentChange::notifyEdit(
1766                                         $now,
1767                                         $this->mTitle,
1768                                         $revision->isMinor(),
1769                                         $user,
1770                                         $summary,
1771                                         $oldid,
1772                                         $this->getTimestamp(),
1773                                         $meta['bot'],
1774                                         '',
1775                                         $oldContent ? $oldContent->getSize() : 0,
1776                                         $newsize,
1777                                         $revisionId,
1778                                         $patrolled,
1779                                         $meta['tags']
1780                                 );
1781                         }
1782
1783                         $user->incEditCount();
1784
1785                         $dbw->endAtomic( __METHOD__ );
1786                         $this->mTimestamp = $now;
1787                 } else {
1788                         // T34948: revision ID must be set to page {{REVISIONID}} and
1789                         // related variables correctly. Likewise for {{REVISIONUSER}} (T135261).
1790                         $revision->setId( $this->getLatest() );
1791                         $revision->setUserIdAndName(
1792                                 $this->getUser( Revision::RAW ),
1793                                 $this->getUserText( Revision::RAW )
1794                         );
1795                 }
1796
1797                 if ( $changed ) {
1798                         // Return the new revision to the caller
1799                         $status->value['revision'] = $revision;
1800                 } else {
1801                         $status->warning( 'edit-no-change' );
1802                         // Update page_touched as updateRevisionOn() was not called.
1803                         // Other cache updates are managed in onArticleEdit() via doEditUpdates().
1804                         $this->mTitle->invalidateCache( $now );
1805                 }
1806
1807                 // Do secondary updates once the main changes have been committed...
1808                 DeferredUpdates::addUpdate(
1809                         new AtomicSectionUpdate(
1810                                 $dbw,
1811                                 __METHOD__,
1812                                 function () use (
1813                                         $revision, &$user, $content, $summary, &$flags,
1814                                         $changed, $meta, &$status
1815                                 ) {
1816                                         // Update links tables, site stats, etc.
1817                                         $this->doEditUpdates(
1818                                                 $revision,
1819                                                 $user,
1820                                                 [
1821                                                         'changed' => $changed,
1822                                                         'oldcountable' => $meta['oldCountable'],
1823                                                         'oldrevision' => $meta['oldRevision']
1824                                                 ]
1825                                         );
1826                                         // Avoid PHP 7.1 warning of passing $this by reference
1827                                         $wikiPage = $this;
1828                                         // Trigger post-save hook
1829                                         $params = [ &$wikiPage, &$user, $content, $summary, $flags & EDIT_MINOR,
1830                                                 null, null, &$flags, $revision, &$status, $meta['baseRevId'],
1831                                                 $meta['undidRevId'] ];
1832                                         Hooks::run( 'PageContentSaveComplete', $params );
1833                                 }
1834                         ),
1835                         DeferredUpdates::PRESEND
1836                 );
1837
1838                 return $status;
1839         }
1840
1841         /**
1842          * @param Content $content Pre-save transform content
1843          * @param integer $flags
1844          * @param User $user
1845          * @param string $summary
1846          * @param array $meta
1847          * @return Status
1848          * @throws DBUnexpectedError
1849          * @throws Exception
1850          * @throws FatalError
1851          * @throws MWException
1852          */
1853         private function doCreate(
1854                 Content $content, $flags, User $user, $summary, array $meta
1855         ) {
1856                 global $wgUseRCPatrol, $wgUseNPPatrol;
1857
1858                 $status = Status::newGood( [ 'new' => true, 'revision' => null ] );
1859
1860                 $now = wfTimestampNow();
1861                 $newsize = $content->getSize();
1862                 $prepStatus = $content->prepareSave( $this, $flags, $meta['oldId'], $user );
1863                 $status->merge( $prepStatus );
1864                 if ( !$status->isOK() ) {
1865                         return $status;
1866                 }
1867
1868                 $dbw = wfGetDB( DB_MASTER );
1869                 $dbw->startAtomic( __METHOD__ );
1870
1871                 // Add the page record unless one already exists for the title
1872                 $newid = $this->insertOn( $dbw );
1873                 if ( $newid === false ) {
1874                         $dbw->endAtomic( __METHOD__ ); // nothing inserted
1875                         $status->fatal( 'edit-already-exists' );
1876
1877                         return $status; // nothing done
1878                 }
1879
1880                 // At this point we are now comitted to returning an OK
1881                 // status unless some DB query error or other exception comes up.
1882                 // This way callers don't have to call rollback() if $status is bad
1883                 // unless they actually try to catch exceptions (which is rare).
1884
1885                 // @TODO: pass content object?!
1886                 $revision = new Revision( [
1887                         'page'       => $newid,
1888                         'title'      => $this->mTitle, // for determining the default content model
1889                         'comment'    => $summary,
1890                         'minor_edit' => $meta['minor'],
1891                         'text'       => $meta['serialized'],
1892                         'len'        => $newsize,
1893                         'user'       => $user->getId(),
1894                         'user_text'  => $user->getName(),
1895                         'timestamp'  => $now,
1896                         'content_model' => $content->getModel(),
1897                         'content_format' => $meta['serialFormat'],
1898                 ] );
1899
1900                 // Save the revision text...
1901                 $revisionId = $revision->insertOn( $dbw );
1902                 // Update the page record with revision data
1903                 if ( !$this->updateRevisionOn( $dbw, $revision, 0 ) ) {
1904                         throw new MWException( "Failed to update page row to use new revision." );
1905                 }
1906
1907                 Hooks::run( 'NewRevisionFromEditComplete', [ $this, $revision, false, $user ] );
1908
1909                 // Update recentchanges
1910                 if ( !( $flags & EDIT_SUPPRESS_RC ) ) {
1911                         // Mark as patrolled if the user can do so
1912                         $patrolled = ( $wgUseRCPatrol || $wgUseNPPatrol ) &&
1913                                 !count( $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
1914                         // Add RC row to the DB
1915                         RecentChange::notifyNew(
1916                                 $now,
1917                                 $this->mTitle,
1918                                 $revision->isMinor(),
1919                                 $user,
1920                                 $summary,
1921                                 $meta['bot'],
1922                                 '',
1923                                 $newsize,
1924                                 $revisionId,
1925                                 $patrolled,
1926                                 $meta['tags']
1927                         );
1928                 }
1929
1930                 $user->incEditCount();
1931
1932                 $dbw->endAtomic( __METHOD__ );
1933                 $this->mTimestamp = $now;
1934
1935                 // Return the new revision to the caller
1936                 $status->value['revision'] = $revision;
1937
1938                 // Do secondary updates once the main changes have been committed...
1939                 DeferredUpdates::addUpdate(
1940                         new AtomicSectionUpdate(
1941                                 $dbw,
1942                                 __METHOD__,
1943                                 function () use (
1944                                         $revision, &$user, $content, $summary, &$flags, $meta, &$status
1945                                 ) {
1946                                         // Update links, etc.
1947                                         $this->doEditUpdates( $revision, $user, [ 'created' => true ] );
1948                                         // Avoid PHP 7.1 warning of passing $this by reference
1949                                         $wikiPage = $this;
1950                                         // Trigger post-create hook
1951                                         $params = [ &$wikiPage, &$user, $content, $summary,
1952                                                 $flags & EDIT_MINOR, null, null, &$flags, $revision ];
1953                                         Hooks::run( 'PageContentInsertComplete', $params );
1954                                         // Trigger post-save hook
1955                                         $params = array_merge( $params, [ &$status, $meta['baseRevId'] ] );
1956                                         Hooks::run( 'PageContentSaveComplete', $params );
1957                                 }
1958                         ),
1959                         DeferredUpdates::PRESEND
1960                 );
1961
1962                 return $status;
1963         }
1964
1965         /**
1966          * Get parser options suitable for rendering the primary article wikitext
1967          *
1968          * @see ContentHandler::makeParserOptions
1969          *
1970          * @param IContextSource|User|string $context One of the following:
1971          *        - IContextSource: Use the User and the Language of the provided
1972          *          context
1973          *        - User: Use the provided User object and $wgLang for the language,
1974          *          so use an IContextSource object if possible.
1975          *        - 'canonical': Canonical options (anonymous user with default
1976          *          preferences and content language).
1977          * @return ParserOptions
1978          */
1979         public function makeParserOptions( $context ) {
1980                 $options = $this->getContentHandler()->makeParserOptions( $context );
1981
1982                 if ( $this->getTitle()->isConversionTable() ) {
1983                         // @todo ConversionTable should become a separate content model, so
1984                         // we don't need special cases like this one.
1985                         $options->disableContentConversion();
1986                 }
1987
1988                 return $options;
1989         }
1990
1991         /**
1992          * Prepare content which is about to be saved.
1993          * Returns a stdClass with source, pst and output members
1994          *
1995          * @param Content $content
1996          * @param Revision|int|null $revision Revision object. For backwards compatibility, a
1997          *        revision ID is also accepted, but this is deprecated.
1998          * @param User|null $user
1999          * @param string|null $serialFormat
2000          * @param bool $useCache Check shared prepared edit cache
2001          *
2002          * @return object
2003          *
2004          * @since 1.21
2005          */
2006         public function prepareContentForEdit(
2007                 Content $content, $revision = null, User $user = null,
2008                 $serialFormat = null, $useCache = true
2009         ) {
2010                 global $wgContLang, $wgUser, $wgAjaxEditStash;
2011
2012                 if ( is_object( $revision ) ) {
2013                         $revid = $revision->getId();
2014                 } else {
2015                         $revid = $revision;
2016                         // This code path is deprecated, and nothing is known to
2017                         // use it, so performance here shouldn't be a worry.
2018                         if ( $revid !== null ) {
2019                                 $revision = Revision::newFromId( $revid, Revision::READ_LATEST );
2020                         } else {
2021                                 $revision = null;
2022                         }
2023                 }
2024
2025                 $user = is_null( $user ) ? $wgUser : $user;
2026                 // XXX: check $user->getId() here???
2027
2028                 // Use a sane default for $serialFormat, see T59026
2029                 if ( $serialFormat === null ) {
2030                         $serialFormat = $content->getContentHandler()->getDefaultFormat();
2031                 }
2032
2033                 if ( $this->mPreparedEdit
2034                         && isset( $this->mPreparedEdit->newContent )
2035                         && $this->mPreparedEdit->newContent->equals( $content )
2036                         && $this->mPreparedEdit->revid == $revid
2037                         && $this->mPreparedEdit->format == $serialFormat
2038                         // XXX: also check $user here?
2039                 ) {
2040                         // Already prepared
2041                         return $this->mPreparedEdit;
2042                 }
2043
2044                 // The edit may have already been prepared via api.php?action=stashedit
2045                 $cachedEdit = $useCache && $wgAjaxEditStash
2046                         ? ApiStashEdit::checkCache( $this->getTitle(), $content, $user )
2047                         : false;
2048
2049                 $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
2050                 Hooks::run( 'ArticlePrepareTextForEdit', [ $this, $popts ] );
2051
2052                 $edit = (object)[];
2053                 if ( $cachedEdit ) {
2054                         $edit->timestamp = $cachedEdit->timestamp;
2055                 } else {
2056                         $edit->timestamp = wfTimestampNow();
2057                 }
2058                 // @note: $cachedEdit is safely not used if the rev ID was referenced in the text
2059                 $edit->revid = $revid;
2060
2061                 if ( $cachedEdit ) {
2062                         $edit->pstContent = $cachedEdit->pstContent;
2063                 } else {
2064                         $edit->pstContent = $content
2065                                 ? $content->preSaveTransform( $this->mTitle, $user, $popts )
2066                                 : null;
2067                 }
2068
2069                 $edit->format = $serialFormat;
2070                 $edit->popts = $this->makeParserOptions( 'canonical' );
2071                 if ( $cachedEdit ) {
2072                         $edit->output = $cachedEdit->output;
2073                 } else {
2074                         if ( $revision ) {
2075                                 // We get here if vary-revision is set. This means that this page references
2076                                 // itself (such as via self-transclusion). In this case, we need to make sure
2077                                 // that any such self-references refer to the newly-saved revision, and not
2078                                 // to the previous one, which could otherwise happen due to replica DB lag.
2079                                 $oldCallback = $edit->popts->getCurrentRevisionCallback();
2080                                 $edit->popts->setCurrentRevisionCallback(
2081                                         function ( Title $title, $parser = false ) use ( $revision, &$oldCallback ) {
2082                                                 if ( $title->equals( $revision->getTitle() ) ) {
2083                                                         return $revision;
2084                                                 } else {
2085                                                         return call_user_func( $oldCallback, $title, $parser );
2086                                                 }
2087                                         }
2088                                 );
2089                         } else {
2090                                 // Try to avoid a second parse if {{REVISIONID}} is used
2091                                 $dbIndex = ( $this->mDataLoadedFrom & self::READ_LATEST ) === self::READ_LATEST
2092                                         ? DB_MASTER // use the best possible guess
2093                                         : DB_REPLICA; // T154554
2094
2095                                 $edit->popts->setSpeculativeRevIdCallback( function () use ( $dbIndex ) {
2096                                         return 1 + (int)wfGetDB( $dbIndex )->selectField(
2097                                                 'revision',
2098                                                 'MAX(rev_id)',
2099                                                 [],
2100                                                 __METHOD__
2101                                         );
2102                                 } );
2103                         }
2104                         $edit->output = $edit->pstContent
2105                                 ? $edit->pstContent->getParserOutput( $this->mTitle, $revid, $edit->popts )
2106                                 : null;
2107                 }
2108
2109                 $edit->newContent = $content;
2110                 $edit->oldContent = $this->getContent( Revision::RAW );
2111
2112                 // NOTE: B/C for hooks! don't use these fields!
2113                 $edit->newText = $edit->newContent
2114                         ? ContentHandler::getContentText( $edit->newContent )
2115                         : '';
2116                 $edit->oldText = $edit->oldContent
2117                         ? ContentHandler::getContentText( $edit->oldContent )
2118                         : '';
2119                 $edit->pst = $edit->pstContent ? $edit->pstContent->serialize( $serialFormat ) : '';
2120
2121                 if ( $edit->output ) {
2122                         $edit->output->setCacheTime( wfTimestampNow() );
2123                 }
2124
2125                 // Process cache the result
2126                 $this->mPreparedEdit = $edit;
2127
2128                 return $edit;
2129         }
2130
2131         /**
2132          * Do standard deferred updates after page edit.
2133          * Update links tables, site stats, search index and message cache.
2134          * Purges pages that include this page if the text was changed here.
2135          * Every 100th edit, prune the recent changes table.
2136          *
2137          * @param Revision $revision
2138          * @param User $user User object that did the revision
2139          * @param array $options Array of options, following indexes are used:
2140          * - changed: boolean, whether the revision changed the content (default true)
2141          * - created: boolean, whether the revision created the page (default false)
2142          * - moved: boolean, whether the page was moved (default false)
2143          * - restored: boolean, whether the page was undeleted (default false)
2144          * - oldrevision: Revision object for the pre-update revision (default null)
2145          * - oldcountable: boolean, null, or string 'no-change' (default null):
2146          *   - boolean: whether the page was counted as an article before that
2147          *     revision, only used in changed is true and created is false
2148          *   - null: if created is false, don't update the article count; if created
2149          *     is true, do update the article count
2150          *   - 'no-change': don't update the article count, ever
2151          */
2152         public function doEditUpdates( Revision $revision, User $user, array $options = [] ) {
2153                 global $wgRCWatchCategoryMembership;
2154
2155                 $options += [
2156                         'changed' => true,
2157                         'created' => false,
2158                         'moved' => false,
2159                         'restored' => false,
2160                         'oldrevision' => null,
2161                         'oldcountable' => null
2162                 ];
2163                 $content = $revision->getContent();
2164
2165                 $logger = LoggerFactory::getInstance( 'SaveParse' );
2166
2167                 // See if the parser output before $revision was inserted is still valid
2168                 $editInfo = false;
2169                 if ( !$this->mPreparedEdit ) {
2170                         $logger->debug( __METHOD__ . ": No prepared edit...\n" );
2171                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision' ) ) {
2172                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision...\n" );
2173                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-revision-id' )
2174                         && $this->mPreparedEdit->output->getSpeculativeRevIdUsed() !== $revision->getId()
2175                 ) {
2176                         $logger->info( __METHOD__ . ": Prepared edit has vary-revision-id with wrong ID...\n" );
2177                 } elseif ( $this->mPreparedEdit->output->getFlag( 'vary-user' ) && !$options['changed'] ) {
2178                         $logger->info( __METHOD__ . ": Prepared edit has vary-user and is null...\n" );
2179                 } else {
2180                         wfDebug( __METHOD__ . ": Using prepared edit...\n" );
2181                         $editInfo = $this->mPreparedEdit;
2182                 }
2183
2184                 if ( !$editInfo ) {
2185                         // Parse the text again if needed. Be careful not to do pre-save transform twice:
2186                         // $text is usually already pre-save transformed once. Avoid using the edit stash
2187                         // as any prepared content from there or in doEditContent() was already rejected.
2188                         $editInfo = $this->prepareContentForEdit( $content, $revision, $user, null, false );
2189                 }
2190
2191                 // Save it to the parser cache.
2192                 // Make sure the cache time matches page_touched to avoid double parsing.
2193                 ParserCache::singleton()->save(
2194                         $editInfo->output, $this, $editInfo->popts,
2195                         $revision->getTimestamp(), $editInfo->revid
2196                 );
2197
2198                 // Update the links tables and other secondary data
2199                 if ( $content ) {
2200                         $recursive = $options['changed']; // T52785
2201                         $updates = $content->getSecondaryDataUpdates(
2202                                 $this->getTitle(), null, $recursive, $editInfo->output
2203                         );
2204                         foreach ( $updates as $update ) {
2205                                 if ( $update instanceof LinksUpdate ) {
2206                                         $update->setRevision( $revision );
2207                                         $update->setTriggeringUser( $user );
2208                                 }
2209                                 DeferredUpdates::addUpdate( $update );
2210                         }
2211                         if ( $wgRCWatchCategoryMembership
2212                                 && $this->getContentHandler()->supportsCategories() === true
2213                                 && ( $options['changed'] || $options['created'] )
2214                                 && !$options['restored']
2215                         ) {
2216                                 // Note: jobs are pushed after deferred updates, so the job should be able to see
2217                                 // the recent change entry (also done via deferred updates) and carry over any
2218                                 // bot/deletion/IP flags, ect.
2219                                 JobQueueGroup::singleton()->lazyPush( new CategoryMembershipChangeJob(
2220                                         $this->getTitle(),
2221                                         [
2222                                                 'pageId' => $this->getId(),
2223                                                 'revTimestamp' => $revision->getTimestamp()
2224                                         ]
2225                                 ) );
2226                         }
2227                 }
2228
2229                 // Avoid PHP 7.1 warning of passing $this by reference
2230                 $wikiPage = $this;
2231
2232                 Hooks::run( 'ArticleEditUpdates', [ &$wikiPage, &$editInfo, $options['changed'] ] );
2233
2234                 if ( Hooks::run( 'ArticleEditUpdatesDeleteFromRecentchanges', [ &$wikiPage ] ) ) {
2235                         // Flush old entries from the `recentchanges` table
2236                         if ( mt_rand( 0, 9 ) == 0 ) {
2237                                 JobQueueGroup::singleton()->lazyPush( RecentChangesUpdateJob::newPurgeJob() );
2238                         }
2239                 }
2240
2241                 if ( !$this->exists() ) {
2242                         return;
2243                 }
2244
2245                 $id = $this->getId();
2246                 $title = $this->mTitle->getPrefixedDBkey();
2247                 $shortTitle = $this->mTitle->getDBkey();
2248
2249                 if ( $options['oldcountable'] === 'no-change' ||
2250                         ( !$options['changed'] && !$options['moved'] )
2251                 ) {
2252                         $good = 0;
2253                 } elseif ( $options['created'] ) {
2254                         $good = (int)$this->isCountable( $editInfo );
2255                 } elseif ( $options['oldcountable'] !== null ) {
2256                         $good = (int)$this->isCountable( $editInfo ) - (int)$options['oldcountable'];
2257                 } else {
2258                         $good = 0;
2259                 }
2260                 $edits = $options['changed'] ? 1 : 0;
2261                 $total = $options['created'] ? 1 : 0;
2262
2263                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, $edits, $good, $total ) );
2264                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $content ) );
2265
2266                 // If this is another user's talk page, update newtalk.
2267                 // Don't do this if $options['changed'] = false (null-edits) nor if
2268                 // it's a minor edit and the user doesn't want notifications for those.
2269                 if ( $options['changed']
2270                         && $this->mTitle->getNamespace() == NS_USER_TALK
2271                         && $shortTitle != $user->getTitleKey()
2272                         && !( $revision->isMinor() && $user->isAllowed( 'nominornewtalk' ) )
2273                 ) {
2274                         $recipient = User::newFromName( $shortTitle, false );
2275                         if ( !$recipient ) {
2276                                 wfDebug( __METHOD__ . ": invalid username\n" );
2277                         } else {
2278                                 // Avoid PHP 7.1 warning of passing $this by reference
2279                                 $wikiPage = $this;
2280
2281                                 // Allow extensions to prevent user notification
2282                                 // when a new message is added to their talk page
2283                                 if ( Hooks::run( 'ArticleEditUpdateNewTalk', [ &$wikiPage, $recipient ] ) ) {
2284                                         if ( User::isIP( $shortTitle ) ) {
2285                                                 // An anonymous user
2286                                                 $recipient->setNewtalk( true, $revision );
2287                                         } elseif ( $recipient->isLoggedIn() ) {
2288                                                 $recipient->setNewtalk( true, $revision );
2289                                         } else {
2290                                                 wfDebug( __METHOD__ . ": don't need to notify a nonexistent user\n" );
2291                                         }
2292                                 }
2293                         }
2294                 }
2295
2296                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2297                         MessageCache::singleton()->updateMessageOverride( $this->mTitle, $content );
2298                 }
2299
2300                 if ( $options['created'] ) {
2301                         self::onArticleCreate( $this->mTitle );
2302                 } elseif ( $options['changed'] ) { // T52785
2303                         self::onArticleEdit( $this->mTitle, $revision );
2304                 }
2305
2306                 ResourceLoaderWikiModule::invalidateModuleCache(
2307                         $this->mTitle, $options['oldrevision'], $revision, wfWikiID()
2308                 );
2309         }
2310
2311         /**
2312          * Update the article's restriction field, and leave a log entry.
2313          * This works for protection both existing and non-existing pages.
2314          *
2315          * @param array $limit Set of restriction keys
2316          * @param array $expiry Per restriction type expiration
2317          * @param int &$cascade Set to false if cascading protection isn't allowed.
2318          * @param string $reason
2319          * @param User $user The user updating the restrictions
2320          * @param string|string[] $tags Change tags to add to the pages and protection log entries
2321          *   ($user should be able to add the specified tags before this is called)
2322          * @return Status Status object; if action is taken, $status->value is the log_id of the
2323          *   protection log entry.
2324          */
2325         public function doUpdateRestrictions( array $limit, array $expiry,
2326                 &$cascade, $reason, User $user, $tags = null
2327         ) {
2328                 global $wgCascadingRestrictionLevels, $wgContLang;
2329
2330                 if ( wfReadOnly() ) {
2331                         return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
2332                 }
2333
2334                 $this->loadPageData( 'fromdbmaster' );
2335                 $restrictionTypes = $this->mTitle->getRestrictionTypes();
2336                 $id = $this->getId();
2337
2338                 if ( !$cascade ) {
2339                         $cascade = false;
2340                 }
2341
2342                 // Take this opportunity to purge out expired restrictions
2343                 Title::purgeExpiredRestrictions();
2344
2345                 // @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
2346                 // we expect a single selection, but the schema allows otherwise.
2347                 $isProtected = false;
2348                 $protect = false;
2349                 $changed = false;
2350
2351                 $dbw = wfGetDB( DB_MASTER );
2352
2353                 foreach ( $restrictionTypes as $action ) {
2354                         if ( !isset( $expiry[$action] ) || $expiry[$action] === $dbw->getInfinity() ) {
2355                                 $expiry[$action] = 'infinity';
2356                         }
2357                         if ( !isset( $limit[$action] ) ) {
2358                                 $limit[$action] = '';
2359                         } elseif ( $limit[$action] != '' ) {
2360                                 $protect = true;
2361                         }
2362
2363                         // Get current restrictions on $action
2364                         $current = implode( '', $this->mTitle->getRestrictions( $action ) );
2365                         if ( $current != '' ) {
2366                                 $isProtected = true;
2367                         }
2368
2369                         if ( $limit[$action] != $current ) {
2370                                 $changed = true;
2371                         } elseif ( $limit[$action] != '' ) {
2372                                 // Only check expiry change if the action is actually being
2373                                 // protected, since expiry does nothing on an not-protected
2374                                 // action.
2375                                 if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
2376                                         $changed = true;
2377                                 }
2378                         }
2379                 }
2380
2381                 if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
2382                         $changed = true;
2383                 }
2384
2385                 // If nothing has changed, do nothing
2386                 if ( !$changed ) {
2387                         return Status::newGood();
2388                 }
2389
2390                 if ( !$protect ) { // No protection at all means unprotection
2391                         $revCommentMsg = 'unprotectedarticle-comment';
2392                         $logAction = 'unprotect';
2393                 } elseif ( $isProtected ) {
2394                         $revCommentMsg = 'modifiedarticleprotection-comment';
2395                         $logAction = 'modify';
2396                 } else {
2397                         $revCommentMsg = 'protectedarticle-comment';
2398                         $logAction = 'protect';
2399                 }
2400
2401                 // Truncate for whole multibyte characters
2402                 $reason = $wgContLang->truncate( $reason, 255 );
2403
2404                 $logRelationsValues = [];
2405                 $logRelationsField = null;
2406                 $logParamsDetails = [];
2407
2408                 // Null revision (used for change tag insertion)
2409                 $nullRevision = null;
2410
2411                 if ( $id ) { // Protection of existing page
2412                         // Avoid PHP 7.1 warning of passing $this by reference
2413                         $wikiPage = $this;
2414
2415                         if ( !Hooks::run( 'ArticleProtect', [ &$wikiPage, &$user, $limit, $reason ] ) ) {
2416                                 return Status::newGood();
2417                         }
2418
2419                         // Only certain restrictions can cascade...
2420                         $editrestriction = isset( $limit['edit'] )
2421                                 ? [ $limit['edit'] ]
2422                                 : $this->mTitle->getRestrictions( 'edit' );
2423                         foreach ( array_keys( $editrestriction, 'sysop' ) as $key ) {
2424                                 $editrestriction[$key] = 'editprotected'; // backwards compatibility
2425                         }
2426                         foreach ( array_keys( $editrestriction, 'autoconfirmed' ) as $key ) {
2427                                 $editrestriction[$key] = 'editsemiprotected'; // backwards compatibility
2428                         }
2429
2430                         $cascadingRestrictionLevels = $wgCascadingRestrictionLevels;
2431                         foreach ( array_keys( $cascadingRestrictionLevels, 'sysop' ) as $key ) {
2432                                 $cascadingRestrictionLevels[$key] = 'editprotected'; // backwards compatibility
2433                         }
2434                         foreach ( array_keys( $cascadingRestrictionLevels, 'autoconfirmed' ) as $key ) {
2435                                 $cascadingRestrictionLevels[$key] = 'editsemiprotected'; // backwards compatibility
2436                         }
2437
2438                         // The schema allows multiple restrictions
2439                         if ( !array_intersect( $editrestriction, $cascadingRestrictionLevels ) ) {
2440                                 $cascade = false;
2441                         }
2442
2443                         // insert null revision to identify the page protection change as edit summary
2444                         $latest = $this->getLatest();
2445                         $nullRevision = $this->insertProtectNullRevision(
2446                                 $revCommentMsg,
2447                                 $limit,
2448                                 $expiry,
2449                                 $cascade,
2450                                 $reason,
2451                                 $user
2452                         );
2453
2454                         if ( $nullRevision === null ) {
2455                                 return Status::newFatal( 'no-null-revision', $this->mTitle->getPrefixedText() );
2456                         }
2457
2458                         $logRelationsField = 'pr_id';
2459
2460                         // Update restrictions table
2461                         foreach ( $limit as $action => $restrictions ) {
2462                                 $dbw->delete(
2463                                         'page_restrictions',
2464                                         [
2465                                                 'pr_page' => $id,
2466                                                 'pr_type' => $action
2467                                         ],
2468                                         __METHOD__
2469                                 );
2470                                 if ( $restrictions != '' ) {
2471                                         $cascadeValue = ( $cascade && $action == 'edit' ) ? 1 : 0;
2472                                         $dbw->insert(
2473                                                 'page_restrictions',
2474                                                 [
2475                                                         'pr_id' => $dbw->nextSequenceValue( 'page_restrictions_pr_id_seq' ),
2476                                                         'pr_page' => $id,
2477                                                         'pr_type' => $action,
2478                                                         'pr_level' => $restrictions,
2479                                                         'pr_cascade' => $cascadeValue,
2480                                                         'pr_expiry' => $dbw->encodeExpiry( $expiry[$action] )
2481                                                 ],
2482                                                 __METHOD__
2483                                         );
2484                                         $logRelationsValues[] = $dbw->insertId();
2485                                         $logParamsDetails[] = [
2486                                                 'type' => $action,
2487                                                 'level' => $restrictions,
2488                                                 'expiry' => $expiry[$action],
2489                                                 'cascade' => (bool)$cascadeValue,
2490                                         ];
2491                                 }
2492                         }
2493
2494                         // Clear out legacy restriction fields
2495                         $dbw->update(
2496                                 'page',
2497                                 [ 'page_restrictions' => '' ],
2498                                 [ 'page_id' => $id ],
2499                                 __METHOD__
2500                         );
2501
2502                         // Avoid PHP 7.1 warning of passing $this by reference
2503                         $wikiPage = $this;
2504
2505                         Hooks::run( 'NewRevisionFromEditComplete',
2506                                 [ $this, $nullRevision, $latest, $user ] );
2507                         Hooks::run( 'ArticleProtectComplete', [ &$wikiPage, &$user, $limit, $reason ] );
2508                 } else { // Protection of non-existing page (also known as "title protection")
2509                         // Cascade protection is meaningless in this case
2510                         $cascade = false;
2511
2512                         if ( $limit['create'] != '' ) {
2513                                 $dbw->replace( 'protected_titles',
2514                                         [ [ 'pt_namespace', 'pt_title' ] ],
2515                                         [
2516                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2517                                                 'pt_title' => $this->mTitle->getDBkey(),
2518                                                 'pt_create_perm' => $limit['create'],
2519                                                 'pt_timestamp' => $dbw->timestamp(),
2520                                                 'pt_expiry' => $dbw->encodeExpiry( $expiry['create'] ),
2521                                                 'pt_user' => $user->getId(),
2522                                                 'pt_reason' => $reason,
2523                                         ], __METHOD__
2524                                 );
2525                                 $logParamsDetails[] = [
2526                                         'type' => 'create',
2527                                         'level' => $limit['create'],
2528                                         'expiry' => $expiry['create'],
2529                                 ];
2530                         } else {
2531                                 $dbw->delete( 'protected_titles',
2532                                         [
2533                                                 'pt_namespace' => $this->mTitle->getNamespace(),
2534                                                 'pt_title' => $this->mTitle->getDBkey()
2535                                         ], __METHOD__
2536                                 );
2537                         }
2538                 }
2539
2540                 $this->mTitle->flushRestrictions();
2541                 InfoAction::invalidateCache( $this->mTitle );
2542
2543                 if ( $logAction == 'unprotect' ) {
2544                         $params = [];
2545                 } else {
2546                         $protectDescriptionLog = $this->protectDescriptionLog( $limit, $expiry );
2547                         $params = [
2548                                 '4::description' => $protectDescriptionLog, // parameter for IRC
2549                                 '5:bool:cascade' => $cascade,
2550                                 'details' => $logParamsDetails, // parameter for localize and api
2551                         ];
2552                 }
2553
2554                 // Update the protection log
2555                 $logEntry = new ManualLogEntry( 'protect', $logAction );
2556                 $logEntry->setTarget( $this->mTitle );
2557                 $logEntry->setComment( $reason );
2558                 $logEntry->setPerformer( $user );
2559                 $logEntry->setParameters( $params );
2560                 if ( !is_null( $nullRevision ) ) {
2561                         $logEntry->setAssociatedRevId( $nullRevision->getId() );
2562                 }
2563                 $logEntry->setTags( $tags );
2564                 if ( $logRelationsField !== null && count( $logRelationsValues ) ) {
2565                         $logEntry->setRelations( [ $logRelationsField => $logRelationsValues ] );
2566                 }
2567                 $logId = $logEntry->insert();
2568                 $logEntry->publish( $logId );
2569
2570                 return Status::newGood( $logId );
2571         }
2572
2573         /**
2574          * Insert a new null revision for this page.
2575          *
2576          * @param string $revCommentMsg Comment message key for the revision
2577          * @param array $limit Set of restriction keys
2578          * @param array $expiry Per restriction type expiration
2579          * @param int $cascade Set to false if cascading protection isn't allowed.
2580          * @param string $reason
2581          * @param User|null $user
2582          * @return Revision|null Null on error
2583          */
2584         public function insertProtectNullRevision( $revCommentMsg, array $limit,
2585                 array $expiry, $cascade, $reason, $user = null
2586         ) {
2587                 $dbw = wfGetDB( DB_MASTER );
2588
2589                 // Prepare a null revision to be added to the history
2590                 $editComment = wfMessage(
2591                         $revCommentMsg,
2592                         $this->mTitle->getPrefixedText(),
2593                         $user ? $user->getName() : ''
2594                 )->inContentLanguage()->text();
2595                 if ( $reason ) {
2596                         $editComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $reason;
2597                 }
2598                 $protectDescription = $this->protectDescription( $limit, $expiry );
2599                 if ( $protectDescription ) {
2600                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2601                         $editComment .= wfMessage( 'parentheses' )->params( $protectDescription )
2602                                 ->inContentLanguage()->text();
2603                 }
2604                 if ( $cascade ) {
2605                         $editComment .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2606                         $editComment .= wfMessage( 'brackets' )->params(
2607                                 wfMessage( 'protect-summary-cascade' )->inContentLanguage()->text()
2608                         )->inContentLanguage()->text();
2609                 }
2610
2611                 $nullRev = Revision::newNullRevision( $dbw, $this->getId(), $editComment, true, $user );
2612                 if ( $nullRev ) {
2613                         $nullRev->insertOn( $dbw );
2614
2615                         // Update page record and touch page
2616                         $oldLatest = $nullRev->getParentId();
2617                         $this->updateRevisionOn( $dbw, $nullRev, $oldLatest );
2618                 }
2619
2620                 return $nullRev;
2621         }
2622
2623         /**
2624          * @param string $expiry 14-char timestamp or "infinity", or false if the input was invalid
2625          * @return string
2626          */
2627         protected function formatExpiry( $expiry ) {
2628                 global $wgContLang;
2629
2630                 if ( $expiry != 'infinity' ) {
2631                         return wfMessage(
2632                                 'protect-expiring',
2633                                 $wgContLang->timeanddate( $expiry, false, false ),
2634                                 $wgContLang->date( $expiry, false, false ),
2635                                 $wgContLang->time( $expiry, false, false )
2636                         )->inContentLanguage()->text();
2637                 } else {
2638                         return wfMessage( 'protect-expiry-indefinite' )
2639                                 ->inContentLanguage()->text();
2640                 }
2641         }
2642
2643         /**
2644          * Builds the description to serve as comment for the edit.
2645          *
2646          * @param array $limit Set of restriction keys
2647          * @param array $expiry Per restriction type expiration
2648          * @return string
2649          */
2650         public function protectDescription( array $limit, array $expiry ) {
2651                 $protectDescription = '';
2652
2653                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2654                         # $action is one of $wgRestrictionTypes = [ 'create', 'edit', 'move', 'upload' ].
2655                         # All possible message keys are listed here for easier grepping:
2656                         # * restriction-create
2657                         # * restriction-edit
2658                         # * restriction-move
2659                         # * restriction-upload
2660                         $actionText = wfMessage( 'restriction-' . $action )->inContentLanguage()->text();
2661                         # $restrictions is one of $wgRestrictionLevels = [ '', 'autoconfirmed', 'sysop' ],
2662                         # with '' filtered out. All possible message keys are listed below:
2663                         # * protect-level-autoconfirmed
2664                         # * protect-level-sysop
2665                         $restrictionsText = wfMessage( 'protect-level-' . $restrictions )
2666                                 ->inContentLanguage()->text();
2667
2668                         $expiryText = $this->formatExpiry( $expiry[$action] );
2669
2670                         if ( $protectDescription !== '' ) {
2671                                 $protectDescription .= wfMessage( 'word-separator' )->inContentLanguage()->text();
2672                         }
2673                         $protectDescription .= wfMessage( 'protect-summary-desc' )
2674                                 ->params( $actionText, $restrictionsText, $expiryText )
2675                                 ->inContentLanguage()->text();
2676                 }
2677
2678                 return $protectDescription;
2679         }
2680
2681         /**
2682          * Builds the description to serve as comment for the log entry.
2683          *
2684          * Some bots may parse IRC lines, which are generated from log entries which contain plain
2685          * protect description text. Keep them in old format to avoid breaking compatibility.
2686          * TODO: Fix protection log to store structured description and format it on-the-fly.
2687          *
2688          * @param array $limit Set of restriction keys
2689          * @param array $expiry Per restriction type expiration
2690          * @return string
2691          */
2692         public function protectDescriptionLog( array $limit, array $expiry ) {
2693                 global $wgContLang;
2694
2695                 $protectDescriptionLog = '';
2696
2697                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2698                         $expiryText = $this->formatExpiry( $expiry[$action] );
2699                         $protectDescriptionLog .= $wgContLang->getDirMark() .
2700                                 "[$action=$restrictions] ($expiryText)";
2701                 }
2702
2703                 return trim( $protectDescriptionLog );
2704         }
2705
2706         /**
2707          * Take an array of page restrictions and flatten it to a string
2708          * suitable for insertion into the page_restrictions field.
2709          *
2710          * @param string[] $limit
2711          *
2712          * @throws MWException
2713          * @return string
2714          */
2715         protected static function flattenRestrictions( $limit ) {
2716                 if ( !is_array( $limit ) ) {
2717                         throw new MWException( __METHOD__ . ' given non-array restriction set' );
2718                 }
2719
2720                 $bits = [];
2721                 ksort( $limit );
2722
2723                 foreach ( array_filter( $limit ) as $action => $restrictions ) {
2724                         $bits[] = "$action=$restrictions";
2725                 }
2726
2727                 return implode( ':', $bits );
2728         }
2729
2730         /**
2731          * Same as doDeleteArticleReal(), but returns a simple boolean. This is kept around for
2732          * backwards compatibility, if you care about error reporting you should use
2733          * doDeleteArticleReal() instead.
2734          *
2735          * Deletes the article with database consistency, writes logs, purges caches
2736          *
2737          * @param string $reason Delete reason for deletion log
2738          * @param bool $suppress Suppress all revisions and log the deletion in
2739          *        the suppression log instead of the deletion log
2740          * @param int $u1 Unused
2741          * @param bool $u2 Unused
2742          * @param array|string &$error Array of errors to append to
2743          * @param User $user The deleting user
2744          * @return bool True if successful
2745          */
2746         public function doDeleteArticle(
2747                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null
2748         ) {
2749                 $status = $this->doDeleteArticleReal( $reason, $suppress, $u1, $u2, $error, $user );
2750                 return $status->isGood();
2751         }
2752
2753         /**
2754          * Back-end article deletion
2755          * Deletes the article with database consistency, writes logs, purges caches
2756          *
2757          * @since 1.19
2758          *
2759          * @param string $reason Delete reason for deletion log
2760          * @param bool $suppress Suppress all revisions and log the deletion in
2761          *   the suppression log instead of the deletion log
2762          * @param int $u1 Unused
2763          * @param bool $u2 Unused
2764          * @param array|string &$error Array of errors to append to
2765          * @param User $user The deleting user
2766          * @param array $tags Tags to apply to the deletion action
2767          * @return Status Status object; if successful, $status->value is the log_id of the
2768          *   deletion log entry. If the page couldn't be deleted because it wasn't
2769          *   found, $status is a non-fatal 'cannotdelete' error
2770          */
2771         public function doDeleteArticleReal(
2772                 $reason, $suppress = false, $u1 = null, $u2 = null, &$error = '', User $user = null,
2773                 $tags = [], $logsubtype = 'delete'
2774         ) {
2775                 global $wgUser, $wgContentHandlerUseDB;
2776
2777                 wfDebug( __METHOD__ . "\n" );
2778
2779                 $status = Status::newGood();
2780
2781                 if ( $this->mTitle->getDBkey() === '' ) {
2782                         $status->error( 'cannotdelete',
2783                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2784                         return $status;
2785                 }
2786
2787                 // Avoid PHP 7.1 warning of passing $this by reference
2788                 $wikiPage = $this;
2789
2790                 $user = is_null( $user ) ? $wgUser : $user;
2791                 if ( !Hooks::run( 'ArticleDelete',
2792                         [ &$wikiPage, &$user, &$reason, &$error, &$status, $suppress ]
2793                 ) ) {
2794                         if ( $status->isOK() ) {
2795                                 // Hook aborted but didn't set a fatal status
2796                                 $status->fatal( 'delete-hook-aborted' );
2797                         }
2798                         return $status;
2799                 }
2800
2801                 $dbw = wfGetDB( DB_MASTER );
2802                 $dbw->startAtomic( __METHOD__ );
2803
2804                 $this->loadPageData( self::READ_LATEST );
2805                 $id = $this->getId();
2806                 // T98706: lock the page from various other updates but avoid using
2807                 // WikiPage::READ_LOCKING as that will carry over the FOR UPDATE to
2808                 // the revisions queries (which also JOIN on user). Only lock the page
2809                 // row and CAS check on page_latest to see if the trx snapshot matches.
2810                 $lockedLatest = $this->lockAndGetLatest();
2811                 if ( $id == 0 || $this->getLatest() != $lockedLatest ) {
2812                         $dbw->endAtomic( __METHOD__ );
2813                         // Page not there or trx snapshot is stale
2814                         $status->error( 'cannotdelete',
2815                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) );
2816                         return $status;
2817                 }
2818
2819                 // Given the lock above, we can be confident in the title and page ID values
2820                 $namespace = $this->getTitle()->getNamespace();
2821                 $dbKey = $this->getTitle()->getDBkey();
2822
2823                 // At this point we are now comitted to returning an OK
2824                 // status unless some DB query error or other exception comes up.
2825                 // This way callers don't have to call rollback() if $status is bad
2826                 // unless they actually try to catch exceptions (which is rare).
2827
2828                 // we need to remember the old content so we can use it to generate all deletion updates.
2829                 $revision = $this->getRevision();
2830                 try {
2831                         $content = $this->getContent( Revision::RAW );
2832                 } catch ( Exception $ex ) {
2833                         wfLogWarning( __METHOD__ . ': failed to load content during deletion! '
2834                                 . $ex->getMessage() );
2835
2836                         $content = null;
2837                 }
2838
2839                 $fields = Revision::selectFields();
2840                 $bitfield = false;
2841
2842                 // Bitfields to further suppress the content
2843                 if ( $suppress ) {
2844                         $bitfield = Revision::SUPPRESSED_ALL;
2845                         $fields = array_diff( $fields, [ 'rev_deleted' ] );
2846                 }
2847
2848                 // For now, shunt the revision data into the archive table.
2849                 // Text is *not* removed from the text table; bulk storage
2850                 // is left intact to avoid breaking block-compression or
2851                 // immutable storage schemes.
2852                 // In the future, we may keep revisions and mark them with
2853                 // the rev_deleted field, which is reserved for this purpose.
2854
2855                 // Get all of the page revisions
2856                 $res = $dbw->select(
2857                         'revision',
2858                         $fields,
2859                         [ 'rev_page' => $id ],
2860                         __METHOD__,
2861                         'FOR UPDATE'
2862                 );
2863                 // Build their equivalent archive rows
2864                 $rowsInsert = [];
2865                 foreach ( $res as $row ) {
2866                         $rowInsert = [
2867                                 'ar_namespace'  => $namespace,
2868                                 'ar_title'      => $dbKey,
2869                                 'ar_comment'    => $row->rev_comment,
2870                                 'ar_user'       => $row->rev_user,
2871                                 'ar_user_text'  => $row->rev_user_text,
2872                                 'ar_timestamp'  => $row->rev_timestamp,
2873                                 'ar_minor_edit' => $row->rev_minor_edit,
2874                                 'ar_rev_id'     => $row->rev_id,
2875                                 'ar_parent_id'  => $row->rev_parent_id,
2876                                 'ar_text_id'    => $row->rev_text_id,
2877                                 'ar_text'       => '',
2878                                 'ar_flags'      => '',
2879                                 'ar_len'        => $row->rev_len,
2880                                 'ar_page_id'    => $id,
2881                                 'ar_deleted'    => $suppress ? $bitfield : $row->rev_deleted,
2882                                 'ar_sha1'       => $row->rev_sha1,
2883                         ];
2884                         if ( $wgContentHandlerUseDB ) {
2885                                 $rowInsert['ar_content_model'] = $row->rev_content_model;
2886                                 $rowInsert['ar_content_format'] = $row->rev_content_format;
2887                         }
2888                         $rowsInsert[] = $rowInsert;
2889                 }
2890                 // Copy them into the archive table
2891                 $dbw->insert( 'archive', $rowsInsert, __METHOD__ );
2892                 // Save this so we can pass it to the ArticleDeleteComplete hook.
2893                 $archivedRevisionCount = $dbw->affectedRows();
2894
2895                 // Clone the title and wikiPage, so we have the information we need when
2896                 // we log and run the ArticleDeleteComplete hook.
2897                 $logTitle = clone $this->mTitle;
2898                 $wikiPageBeforeDelete = clone $this;
2899
2900                 // Now that it's safely backed up, delete it
2901                 $dbw->delete( 'page', [ 'page_id' => $id ], __METHOD__ );
2902                 $dbw->delete( 'revision', [ 'rev_page' => $id ], __METHOD__ );
2903
2904                 // Log the deletion, if the page was suppressed, put it in the suppression log instead
2905                 $logtype = $suppress ? 'suppress' : 'delete';
2906
2907                 $logEntry = new ManualLogEntry( $logtype, $logsubtype );
2908                 $logEntry->setPerformer( $user );
2909                 $logEntry->setTarget( $logTitle );
2910                 $logEntry->setComment( $reason );
2911                 $logEntry->setTags( $tags );
2912                 $logid = $logEntry->insert();
2913
2914                 $dbw->onTransactionPreCommitOrIdle(
2915                         function () use ( $dbw, $logEntry, $logid ) {
2916                                 // T58776: avoid deadlocks (especially from FileDeleteForm)
2917                                 $logEntry->publish( $logid );
2918                         },
2919                         __METHOD__
2920                 );
2921
2922                 $dbw->endAtomic( __METHOD__ );
2923
2924                 $this->doDeleteUpdates( $id, $content, $revision );
2925
2926                 Hooks::run( 'ArticleDeleteComplete', [
2927                         &$wikiPageBeforeDelete,
2928                         &$user,
2929                         $reason,
2930                         $id,
2931                         $content,
2932                         $logEntry,
2933                         $archivedRevisionCount
2934                 ] );
2935                 $status->value = $logid;
2936
2937                 // Show log excerpt on 404 pages rather than just a link
2938                 $cache = ObjectCache::getMainStashInstance();
2939                 $key = wfMemcKey( 'page-recent-delete', md5( $logTitle->getPrefixedText() ) );
2940                 $cache->set( $key, 1, $cache::TTL_DAY );
2941
2942                 return $status;
2943         }
2944
2945         /**
2946          * Lock the page row for this title+id and return page_latest (or 0)
2947          *
2948          * @return integer Returns 0 if no row was found with this title+id
2949          * @since 1.27
2950          */
2951         public function lockAndGetLatest() {
2952                 return (int)wfGetDB( DB_MASTER )->selectField(
2953                         'page',
2954                         'page_latest',
2955                         [
2956                                 'page_id' => $this->getId(),
2957                                 // Typically page_id is enough, but some code might try to do
2958                                 // updates assuming the title is the same, so verify that
2959                                 'page_namespace' => $this->getTitle()->getNamespace(),
2960                                 'page_title' => $this->getTitle()->getDBkey()
2961                         ],
2962                         __METHOD__,
2963                         [ 'FOR UPDATE' ]
2964                 );
2965         }
2966
2967         /**
2968          * Do some database updates after deletion
2969          *
2970          * @param int $id The page_id value of the page being deleted
2971          * @param Content|null $content Optional page content to be used when determining
2972          *   the required updates. This may be needed because $this->getContent()
2973          *   may already return null when the page proper was deleted.
2974          * @param Revision|null $revision The latest page revision
2975          */
2976         public function doDeleteUpdates( $id, Content $content = null, Revision $revision = null ) {
2977                 try {
2978                         $countable = $this->isCountable();
2979                 } catch ( Exception $ex ) {
2980                         // fallback for deleting broken pages for which we cannot load the content for
2981                         // some reason. Note that doDeleteArticleReal() already logged this problem.
2982                         $countable = false;
2983                 }
2984
2985                 // Update site status
2986                 DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, - (int)$countable, -1 ) );
2987
2988                 // Delete pagelinks, update secondary indexes, etc
2989                 $updates = $this->getDeletionUpdates( $content );
2990                 foreach ( $updates as $update ) {
2991                         DeferredUpdates::addUpdate( $update );
2992                 }
2993
2994                 // Reparse any pages transcluding this page
2995                 LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'templatelinks' );
2996
2997                 // Reparse any pages including this image
2998                 if ( $this->mTitle->getNamespace() == NS_FILE ) {
2999                         LinksUpdate::queueRecursiveJobsForTable( $this->mTitle, 'imagelinks' );
3000                 }
3001
3002                 // Clear caches
3003                 WikiPage::onArticleDelete( $this->mTitle );
3004                 ResourceLoaderWikiModule::invalidateModuleCache(
3005                         $this->mTitle, $revision, null, wfWikiID()
3006                 );
3007
3008                 // Reset this object and the Title object
3009                 $this->loadFromRow( false, self::READ_LATEST );
3010
3011                 // Search engine
3012                 DeferredUpdates::addUpdate( new SearchUpdate( $id, $this->mTitle ) );
3013         }
3014
3015         /**
3016          * Roll back the most recent consecutive set of edits to a page
3017          * from the same user; fails if there are no eligible edits to
3018          * roll back to, e.g. user is the sole contributor. This function
3019          * performs permissions checks on $user, then calls commitRollback()
3020          * to do the dirty work
3021          *
3022          * @todo Separate the business/permission stuff out from backend code
3023          * @todo Remove $token parameter. Already verified by RollbackAction and ApiRollback.
3024          *
3025          * @param string $fromP Name of the user whose edits to rollback.
3026          * @param string $summary Custom summary. Set to default summary if empty.
3027          * @param string $token Rollback token.
3028          * @param bool $bot If true, mark all reverted edits as bot.
3029          *
3030          * @param array $resultDetails Array contains result-specific array of additional values
3031          *    'alreadyrolled' : 'current' (rev)
3032          *    success        : 'summary' (str), 'current' (rev), 'target' (rev)
3033          *
3034          * @param User $user The user performing the rollback
3035          * @param array|null $tags Change tags to apply to the rollback
3036          * Callers are responsible for permission checks
3037          * (with ChangeTags::canAddTagsAccompanyingChange)
3038          *
3039          * @return array Array of errors, each error formatted as
3040          *   array(messagekey, param1, param2, ...).
3041          * On success, the array is empty.  This array can also be passed to
3042          * OutputPage::showPermissionsErrorPage().
3043          */
3044         public function doRollback(
3045                 $fromP, $summary, $token, $bot, &$resultDetails, User $user, $tags = null
3046         ) {
3047                 $resultDetails = null;
3048
3049                 // Check permissions
3050                 $editErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $user );
3051                 $rollbackErrors = $this->mTitle->getUserPermissionsErrors( 'rollback', $user );
3052                 $errors = array_merge( $editErrors, wfArrayDiff2( $rollbackErrors, $editErrors ) );
3053
3054                 if ( !$user->matchEditToken( $token, 'rollback' ) ) {
3055                         $errors[] = [ 'sessionfailure' ];
3056                 }
3057
3058                 if ( $user->pingLimiter( 'rollback' ) || $user->pingLimiter() ) {
3059                         $errors[] = [ 'actionthrottledtext' ];
3060                 }
3061
3062                 // If there were errors, bail out now
3063                 if ( !empty( $errors ) ) {
3064                         return $errors;
3065                 }
3066
3067                 return $this->commitRollback( $fromP, $summary, $bot, $resultDetails, $user, $tags );
3068         }
3069
3070         /**
3071          * Backend implementation of doRollback(), please refer there for parameter
3072          * and return value documentation
3073          *
3074          * NOTE: This function does NOT check ANY permissions, it just commits the
3075          * rollback to the DB. Therefore, you should only call this function direct-
3076          * ly if you want to use custom permissions checks. If you don't, use
3077          * doRollback() instead.
3078          * @param string $fromP Name of the user whose edits to rollback.
3079          * @param string $summary Custom summary. Set to default summary if empty.
3080          * @param bool $bot If true, mark all reverted edits as bot.
3081          *
3082          * @param array $resultDetails Contains result-specific array of additional values
3083          * @param User $guser The user performing the rollback
3084          * @param array|null $tags Change tags to apply to the rollback
3085          * Callers are responsible for permission checks
3086          * (with ChangeTags::canAddTagsAccompanyingChange)
3087          *
3088          * @return array
3089          */
3090         public function commitRollback( $fromP, $summary, $bot,
3091                 &$resultDetails, User $guser, $tags = null
3092         ) {
3093                 global $wgUseRCPatrol, $wgContLang;
3094
3095                 $dbw = wfGetDB( DB_MASTER );
3096
3097                 if ( wfReadOnly() ) {
3098                         return [ [ 'readonlytext' ] ];
3099                 }
3100
3101                 // Get the last editor
3102                 $current = $this->getRevision();
3103                 if ( is_null( $current ) ) {
3104                         // Something wrong... no page?
3105                         return [ [ 'notanarticle' ] ];
3106                 }
3107
3108                 $from = str_replace( '_', ' ', $fromP );
3109                 // User name given should match up with the top revision.
3110                 // If the user was deleted then $from should be empty.
3111                 if ( $from != $current->getUserText() ) {
3112                         $resultDetails = [ 'current' => $current ];
3113                         return [ [ 'alreadyrolled',
3114                                 htmlspecialchars( $this->mTitle->getPrefixedText() ),
3115                                 htmlspecialchars( $fromP ),
3116                                 htmlspecialchars( $current->getUserText() )
3117                         ] ];
3118                 }
3119
3120                 // Get the last edit not by this person...
3121                 // Note: these may not be public values
3122                 $user = intval( $current->getUser( Revision::RAW ) );
3123                 $user_text = $dbw->addQuotes( $current->getUserText( Revision::RAW ) );
3124                 $s = $dbw->selectRow( 'revision',
3125                         [ 'rev_id', 'rev_timestamp', 'rev_deleted' ],
3126                         [ 'rev_page' => $current->getPage(),
3127                                 "rev_user != {$user} OR rev_user_text != {$user_text}"
3128                         ], __METHOD__,
3129                         [ 'USE INDEX' => 'page_timestamp',
3130                                 'ORDER BY' => 'rev_timestamp DESC' ]
3131                         );
3132                 if ( $s === false ) {
3133                         // No one else ever edited this page
3134                         return [ [ 'cantrollback' ] ];
3135                 } elseif ( $s->rev_deleted & Revision::DELETED_TEXT
3136                         || $s->rev_deleted & Revision::DELETED_USER
3137                 ) {
3138                         // Only admins can see this text
3139                         return [ [ 'notvisiblerev' ] ];
3140                 }
3141
3142                 // Generate the edit summary if necessary
3143                 $target = Revision::newFromId( $s->rev_id, Revision::READ_LATEST );
3144                 if ( empty( $summary ) ) {
3145                         if ( $from == '' ) { // no public user name
3146                                 $summary = wfMessage( 'revertpage-nouser' );
3147                         } else {
3148                                 $summary = wfMessage( 'revertpage' );
3149                         }
3150                 }
3151
3152                 // Allow the custom summary to use the same args as the default message
3153                 $args = [
3154                         $target->getUserText(), $from, $s->rev_id,
3155                         $wgContLang->timeanddate( wfTimestamp( TS_MW, $s->rev_timestamp ) ),
3156                         $current->getId(), $wgContLang->timeanddate( $current->getTimestamp() )
3157                 ];
3158                 if ( $summary instanceof Message ) {
3159                         $summary = $summary->params( $args )->inContentLanguage()->text();
3160                 } else {
3161                         $summary = wfMsgReplaceArgs( $summary, $args );
3162                 }
3163
3164                 // Trim spaces on user supplied text
3165                 $summary = trim( $summary );
3166
3167                 // Truncate for whole multibyte characters.
3168                 $summary = $wgContLang->truncate( $summary, 255 );
3169
3170                 // Save
3171                 $flags = EDIT_UPDATE | EDIT_INTERNAL;
3172
3173                 if ( $guser->isAllowed( 'minoredit' ) ) {
3174                         $flags |= EDIT_MINOR;
3175                 }
3176
3177                 if ( $bot && ( $guser->isAllowedAny( 'markbotedits', 'bot' ) ) ) {
3178                         $flags |= EDIT_FORCE_BOT;
3179                 }
3180
3181                 $targetContent = $target->getContent();
3182                 $changingContentModel = $targetContent->getModel() !== $current->getContentModel();
3183
3184                 // Actually store the edit
3185                 $status = $this->doEditContent(
3186                         $targetContent,
3187                         $summary,
3188                         $flags,
3189                         $target->getId(),
3190                         $guser,
3191                         null,
3192                         $tags
3193                 );
3194
3195                 // Set patrolling and bot flag on the edits, which gets rollbacked.
3196                 // This is done even on edit failure to have patrolling in that case (T64157).
3197                 $set = [];
3198                 if ( $bot && $guser->isAllowed( 'markbotedits' ) ) {
3199                         // Mark all reverted edits as bot
3200                         $set['rc_bot'] = 1;
3201                 }
3202
3203                 if ( $wgUseRCPatrol ) {
3204                         // Mark all reverted edits as patrolled
3205                         $set['rc_patrolled'] = 1;
3206                 }
3207
3208                 if ( count( $set ) ) {
3209                         $dbw->update( 'recentchanges', $set,
3210                                 [ /* WHERE */
3211                                         'rc_cur_id' => $current->getPage(),
3212                                         'rc_user_text' => $current->getUserText(),
3213                                         'rc_timestamp > ' . $dbw->addQuotes( $s->rev_timestamp ),
3214                                 ],
3215                                 __METHOD__
3216                         );
3217                 }
3218
3219                 if ( !$status->isOK() ) {
3220                         return $status->getErrorsArray();
3221                 }
3222
3223                 // raise error, when the edit is an edit without a new version
3224                 $statusRev = isset( $status->value['revision'] )
3225                         ? $status->value['revision']
3226                         : null;
3227                 if ( !( $statusRev instanceof Revision ) ) {
3228                         $resultDetails = [ 'current' => $current ];
3229                         return [ [ 'alreadyrolled',
3230                                         htmlspecialchars( $this->mTitle->getPrefixedText() ),
3231                                         htmlspecialchars( $fromP ),
3232                                         htmlspecialchars( $current->getUserText() )
3233                         ] ];
3234                 }
3235
3236                 if ( $changingContentModel ) {
3237                         // If the content model changed during the rollback,
3238                         // make sure it gets logged to Special:Log/contentmodel
3239                         $log = new ManualLogEntry( 'contentmodel', 'change' );
3240                         $log->setPerformer( $guser );
3241                         $log->setTarget( $this->mTitle );
3242                         $log->setComment( $summary );
3243                         $log->setParameters( [
3244                                 '4::oldmodel' => $current->getContentModel(),
3245                                 '5::newmodel' => $targetContent->getModel(),
3246                         ] );
3247
3248                         $logId = $log->insert( $dbw );
3249                         $log->publish( $logId );
3250                 }
3251
3252                 $revId = $statusRev->getId();
3253
3254                 Hooks::run( 'ArticleRollbackComplete', [ $this, $guser, $target, $current ] );
3255
3256                 $resultDetails = [
3257                         'summary' => $summary,
3258                         'current' => $current,
3259                         'target' => $target,
3260                         'newid' => $revId
3261                 ];
3262
3263                 return [];
3264         }
3265
3266         /**
3267          * The onArticle*() functions are supposed to be a kind of hooks
3268          * which should be called whenever any of the specified actions
3269          * are done.
3270          *
3271          * This is a good place to put code to clear caches, for instance.
3272          *
3273          * This is called on page move and undelete, as well as edit
3274          *
3275          * @param Title $title
3276          */
3277         public static function onArticleCreate( Title $title ) {
3278                 // Update existence markers on article/talk tabs...
3279                 $other = $title->getOtherPage();
3280
3281                 $other->purgeSquid();
3282
3283                 $title->touchLinks();
3284                 $title->purgeSquid();
3285                 $title->deleteTitleProtection();
3286
3287                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3288
3289                 if ( $title->getNamespace() == NS_CATEGORY ) {
3290                         // Load the Category object, which will schedule a job to create
3291                         // the category table row if necessary. Checking a replica DB is ok
3292                         // here, in the worst case it'll run an unnecessary recount job on
3293                         // a category that probably doesn't have many members.
3294                         Category::newFromTitle( $title )->getID();
3295                 }
3296         }
3297
3298         /**
3299          * Clears caches when article is deleted
3300          *
3301          * @param Title $title
3302          */
3303         public static function onArticleDelete( Title $title ) {
3304                 // Update existence markers on article/talk tabs...
3305                 $other = $title->getOtherPage();
3306
3307                 $other->purgeSquid();
3308
3309                 $title->touchLinks();
3310                 $title->purgeSquid();
3311
3312                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3313
3314                 // File cache
3315                 HTMLFileCache::clearFileCache( $title );
3316                 InfoAction::invalidateCache( $title );
3317
3318                 // Messages
3319                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
3320                         MessageCache::singleton()->updateMessageOverride( $title, null );
3321                 }
3322
3323                 // Images
3324                 if ( $title->getNamespace() == NS_FILE ) {
3325                         DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
3326                 }
3327
3328                 // User talk pages
3329                 if ( $title->getNamespace() == NS_USER_TALK ) {
3330                         $user = User::newFromName( $title->getText(), false );
3331                         if ( $user ) {
3332                                 $user->setNewtalk( false );
3333                         }
3334                 }
3335
3336                 // Image redirects
3337                 RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
3338         }
3339
3340         /**
3341          * Purge caches on page update etc
3342          *
3343          * @param Title $title
3344          * @param Revision|null $revision Revision that was just saved, may be null
3345          */
3346         public static function onArticleEdit( Title $title, Revision $revision = null ) {
3347                 // Invalidate caches of articles which include this page
3348                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'templatelinks' ) );
3349
3350                 // Invalidate the caches of all pages which redirect here
3351                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
3352
3353                 MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
3354
3355                 // Purge CDN for this page only
3356                 $title->purgeSquid();
3357                 // Clear file cache for this page only
3358                 HTMLFileCache::clearFileCache( $title );
3359
3360                 $revid = $revision ? $revision->getId() : null;
3361                 DeferredUpdates::addCallableUpdate( function() use ( $title, $revid ) {
3362                         InfoAction::invalidateCache( $title, $revid );
3363                 } );
3364         }
3365
3366         /**#@-*/
3367
3368         /**
3369          * Returns a list of categories this page is a member of.
3370          * Results will include hidden categories
3371          *
3372          * @return TitleArray
3373          */
3374         public function getCategories() {
3375                 $id = $this->getId();
3376                 if ( $id == 0 ) {
3377                         return TitleArray::newFromResult( new FakeResultWrapper( [] ) );
3378                 }
3379
3380                 $dbr = wfGetDB( DB_REPLICA );
3381                 $res = $dbr->select( 'categorylinks',
3382                         [ 'cl_to AS page_title, ' . NS_CATEGORY . ' AS page_namespace' ],
3383                         // Have to do that since Database::fieldNamesWithAlias treats numeric indexes
3384                         // as not being aliases, and NS_CATEGORY is numeric
3385                         [ 'cl_from' => $id ],
3386                         __METHOD__ );
3387
3388                 return TitleArray::newFromResult( $res );
3389         }
3390
3391         /**
3392          * Returns a list of hidden categories this page is a member of.
3393          * Uses the page_props and categorylinks tables.
3394          *
3395          * @return array Array of Title objects
3396          */
3397         public function getHiddenCategories() {
3398                 $result = [];
3399                 $id = $this->getId();
3400
3401                 if ( $id == 0 ) {
3402                         return [];
3403                 }
3404
3405                 $dbr = wfGetDB( DB_REPLICA );
3406                 $res = $dbr->select( [ 'categorylinks', 'page_props', 'page' ],
3407                         [ 'cl_to' ],
3408                         [ 'cl_from' => $id, 'pp_page=page_id', 'pp_propname' => 'hiddencat',
3409                                 'page_namespace' => NS_CATEGORY, 'page_title=cl_to' ],
3410                         __METHOD__ );
3411
3412                 if ( $res !== false ) {
3413                         foreach ( $res as $row ) {
3414                                 $result[] = Title::makeTitle( NS_CATEGORY, $row->cl_to );
3415                         }
3416                 }
3417
3418                 return $result;
3419         }
3420
3421         /**
3422          * Auto-generates a deletion reason
3423          *
3424          * @param bool &$hasHistory Whether the page has a history
3425          * @return string|bool String containing deletion reason or empty string, or boolean false
3426          *    if no revision occurred
3427          */
3428         public function getAutoDeleteReason( &$hasHistory ) {
3429                 return $this->getContentHandler()->getAutoDeleteReason( $this->getTitle(), $hasHistory );
3430         }
3431
3432         /**
3433          * Update all the appropriate counts in the category table, given that
3434          * we've added the categories $added and deleted the categories $deleted.
3435          *
3436          * This should only be called from deferred updates or jobs to avoid contention.
3437          *
3438          * @param array $added The names of categories that were added
3439          * @param array $deleted The names of categories that were deleted
3440          * @param integer $id Page ID (this should be the original deleted page ID)
3441          */
3442         public function updateCategoryCounts( array $added, array $deleted, $id = 0 ) {
3443                 $id = $id ?: $this->getId();
3444                 $ns = $this->getTitle()->getNamespace();
3445
3446                 $addFields = [ 'cat_pages = cat_pages + 1' ];
3447                 $removeFields = [ 'cat_pages = cat_pages - 1' ];
3448                 if ( $ns == NS_CATEGORY ) {
3449                         $addFields[] = 'cat_subcats = cat_subcats + 1';
3450                         $removeFields[] = 'cat_subcats = cat_subcats - 1';
3451                 } elseif ( $ns == NS_FILE ) {
3452                         $addFields[] = 'cat_files = cat_files + 1';
3453                         $removeFields[] = 'cat_files = cat_files - 1';
3454                 }
3455
3456                 $dbw = wfGetDB( DB_MASTER );
3457
3458                 if ( count( $added ) ) {
3459                         $existingAdded = $dbw->selectFieldValues(
3460                                 'category',
3461                                 'cat_title',
3462                                 [ 'cat_title' => $added ],
3463                                 __METHOD__
3464                         );
3465
3466                         // For category rows that already exist, do a plain
3467                         // UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE
3468                         // to avoid creating gaps in the cat_id sequence.
3469                         if ( count( $existingAdded ) ) {
3470                                 $dbw->update(
3471                                         'category',
3472                                         $addFields,
3473                                         [ 'cat_title' => $existingAdded ],
3474                                         __METHOD__
3475                                 );
3476                         }
3477
3478                         $missingAdded = array_diff( $added, $existingAdded );
3479                         if ( count( $missingAdded ) ) {
3480                                 $insertRows = [];
3481                                 foreach ( $missingAdded as $cat ) {
3482                                         $insertRows[] = [
3483                                                 'cat_title'   => $cat,
3484                                                 'cat_pages'   => 1,
3485                                                 'cat_subcats' => ( $ns == NS_CATEGORY ) ? 1 : 0,
3486                                                 'cat_files'   => ( $ns == NS_FILE ) ? 1 : 0,
3487                                         ];
3488                                 }
3489                                 $dbw->upsert(
3490                                         'category',
3491                                         $insertRows,
3492                                         [ 'cat_title' ],
3493                                         $addFields,
3494                                         __METHOD__
3495                                 );
3496                         }
3497                 }
3498
3499                 if ( count( $deleted ) ) {
3500                         $dbw->update(
3501                                 'category',
3502                                 $removeFields,
3503                                 [ 'cat_title' => $deleted ],
3504                                 __METHOD__
3505                         );
3506                 }
3507
3508                 foreach ( $added as $catName ) {
3509                         $cat = Category::newFromName( $catName );
3510                         Hooks::run( 'CategoryAfterPageAdded', [ $cat, $this ] );
3511                 }
3512
3513                 foreach ( $deleted as $catName ) {
3514                         $cat = Category::newFromName( $catName );
3515                         Hooks::run( 'CategoryAfterPageRemoved', [ $cat, $this, $id ] );
3516                 }
3517
3518                 // Refresh counts on categories that should be empty now, to
3519                 // trigger possible deletion. Check master for the most
3520                 // up-to-date cat_pages.
3521                 if ( count( $deleted ) ) {
3522                         $rows = $dbw->select(
3523                                 'category',
3524                                 [ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ],
3525                                 [ 'cat_title' => $deleted, 'cat_pages <= 0' ],
3526                                 __METHOD__
3527                         );
3528                         foreach ( $rows as $row ) {
3529                                 $cat = Category::newFromRow( $row );
3530                                 $cat->refreshCounts();
3531                         }
3532                 }
3533         }
3534
3535         /**
3536          * Opportunistically enqueue link update jobs given fresh parser output if useful
3537          *
3538          * @param ParserOutput $parserOutput Current version page output
3539          * @since 1.25
3540          */
3541         public function triggerOpportunisticLinksUpdate( ParserOutput $parserOutput ) {
3542                 if ( wfReadOnly() ) {
3543                         return;
3544                 }
3545
3546                 if ( !Hooks::run( 'OpportunisticLinksUpdate',
3547                         [ $this, $this->mTitle, $parserOutput ]
3548                 ) ) {
3549                         return;
3550                 }
3551
3552                 $config = RequestContext::getMain()->getConfig();
3553
3554                 $params = [
3555                         'isOpportunistic' => true,
3556                         'rootJobTimestamp' => $parserOutput->getCacheTime()
3557                 ];
3558
3559                 if ( $this->mTitle->areRestrictionsCascading() ) {
3560                         // If the page is cascade protecting, the links should really be up-to-date
3561                         JobQueueGroup::singleton()->lazyPush(
3562                                 RefreshLinksJob::newPrioritized( $this->mTitle, $params )
3563                         );
3564                 } elseif ( !$config->get( 'MiserMode' ) && $parserOutput->hasDynamicContent() ) {
3565                         // Assume the output contains "dynamic" time/random based magic words.
3566                         // Only update pages that expired due to dynamic content and NOT due to edits
3567                         // to referenced templates/files. When the cache expires due to dynamic content,
3568                         // page_touched is unchanged. We want to avoid triggering redundant jobs due to
3569                         // views of pages that were just purged via HTMLCacheUpdateJob. In that case, the
3570                         // template/file edit already triggered recursive RefreshLinksJob jobs.
3571                         if ( $this->getLinksTimestamp() > $this->getTouched() ) {
3572                                 // If a page is uncacheable, do not keep spamming a job for it.
3573                                 // Although it would be de-duplicated, it would still waste I/O.
3574                                 $cache = ObjectCache::getLocalClusterInstance();
3575                                 $key = $cache->makeKey( 'dynamic-linksupdate', 'last', $this->getId() );
3576                                 $ttl = max( $parserOutput->getCacheExpiry(), 3600 );
3577                                 if ( $cache->add( $key, time(), $ttl ) ) {
3578                                         JobQueueGroup::singleton()->lazyPush(
3579                                                 RefreshLinksJob::newDynamic( $this->mTitle, $params )
3580                                         );
3581                                 }
3582                         }
3583                 }
3584         }
3585
3586         /**
3587          * Returns a list of updates to be performed when this page is deleted. The
3588          * updates should remove any information about this page from secondary data
3589          * stores such as links tables.
3590          *
3591          * @param Content|null $content Optional Content object for determining the
3592          *   necessary updates.
3593          * @return DeferrableUpdate[]
3594          */
3595         public function getDeletionUpdates( Content $content = null ) {
3596                 if ( !$content ) {
3597                         // load content object, which may be used to determine the necessary updates.
3598                         // XXX: the content may not be needed to determine the updates.
3599                         try {
3600                                 $content = $this->getContent( Revision::RAW );
3601                         } catch ( Exception $ex ) {
3602                                 // If we can't load the content, something is wrong. Perhaps that's why
3603                                 // the user is trying to delete the page, so let's not fail in that case.
3604                                 // Note that doDeleteArticleReal() will already have logged an issue with
3605                                 // loading the content.
3606                         }
3607                 }
3608
3609                 if ( !$content ) {
3610                         $updates = [];
3611                 } else {
3612                         $updates = $content->getDeletionUpdates( $this );
3613                 }
3614
3615                 Hooks::run( 'WikiPageDeletionUpdates', [ $this, $content, &$updates ] );
3616                 return $updates;
3617         }
3618
3619         /**
3620          * Whether this content displayed on this page
3621          * comes from the local database
3622          *
3623          * @since 1.28
3624          * @return bool
3625          */
3626         public function isLocal() {
3627                 return true;
3628         }
3629
3630         /**
3631          * The display name for the site this content
3632          * come from. If a subclass overrides isLocal(),
3633          * this could return something other than the
3634          * current site name
3635          *
3636          * @since 1.28
3637          * @return string
3638          */
3639         public function getWikiDisplayName() {
3640                 global $wgSitename;
3641                 return $wgSitename;
3642         }
3643
3644         /**
3645          * Get the source URL for the content on this page,
3646          * typically the canonical URL, but may be a remote
3647          * link if the content comes from another site
3648          *
3649          * @since 1.28
3650          * @return string
3651          */
3652         public function getSourceURL() {
3653                 return $this->getTitle()->getCanonicalURL();
3654         }
3655
3656         /*
3657          * @param WANObjectCache $cache
3658          * @return string[]
3659          * @since 1.28
3660          */
3661         public function getMutableCacheKeys( WANObjectCache $cache ) {
3662                 $linkCache = MediaWikiServices::getInstance()->getLinkCache();
3663
3664                 return $linkCache->getMutableCacheKeys( $cache, $this->getTitle()->getTitleValue() );
3665         }
3666 }